Ventilation unit using temperature and atmospheric pressure equilibrium and preservation system using same

Abstract

An atmospheric pressure equilibrium ventilation unit.

1 . An atmospheric pressure equilibrium ventilation unit, comprising:
 a first frame assembly including a first frame configured to define a first ventilation hole, a first rotation shaft installed in the first ventilation hole, and a first opening/closing plate provided in the first rotation shaft and configured to rotate together with the first rotation shaft to open and close the first ventilation hole;   a second frame assembly disposed adjacent to the first frame assembly, the second frame assembly including a second frame configured to define a second ventilation hole, a second rotation shaft installed in the second ventilation hole and a second opening/closing plate provided in the second rotation shaft and configured to rotate together with the second rotation shaft to open and close the second ventilation hole, the second opening/closing plate configured to open the second ventilation hole by being rotated by a difference between atmospheric pressures applied to opposite sides of the second opening/closing plate;   a drive unit connected to the first rotation shaft, the drive unit including a reversible motor configured to rotate the first rotation shaft in a forward direction or a reverse direction in response to an opening signal or a closing signal;   a drive control unit connected to the first rotation shaft and the reversible motor and configured to control the reversible motor by cutting off the opening signal or the closing signal when the first rotation shaft is rotated by a predetermined angle; and   a locking control unit connected to the first rotation shaft and the second rotation shaft and configured to lock the second rotation shaft to keep the second ventilation hole in a closed state when the first rotation shaft is rotated by a predetermined angle in response to the opening signal to open the first ventilation hole.   
     
     
         2 . The ventilation unit of  claim 1 , wherein the first ventilation hole includes a first lower ventilation hole and a first upper ventilation hole disposed in a vertical direction, the first rotation shaft including a first lower rotation shaft installed in the first lower ventilation hole and a first upper rotation shaft installed in the first upper ventilation hole, the first opening/closing plate including a first lower opening/closing plate provided in the first lower rotation shaft and a first upper opening/closing plate provided in the first upper rotation shaft. 
     
     
         3 . The ventilation unit of  claim 2 , wherein the first upper rotation shaft is connected to a first link, the first lower rotation shaft is connected to a second link, and the first link and the second link are interconnected by a connection link. 
     
     
         4 . The ventilation unit of  claim 3 , wherein the first link is an input link connected to a drive shaft of the reversible motor, and the second link is an output link. 
     
     
         5 . The ventilation unit of  claim 3 , wherein the locking control unit includes:
 a balancing blade formed in at least one end portion of the second rotation shaft and provided with a locking protrusion portion protruding in a horizontal direction; and   a fixing blade connected to the connection link and configured to move upward, make contact with the locking protrusion portion and hold the balancing blade against movement when the first rotation shaft is rotated by a predetermined angle in response to the opening signal.   
     
     
         6 . The ventilation unit of  claim 5 , wherein the locking protrusion portion includes at least two locking protrusion portions spaced apart from each other in the horizontal direction, and
 when the first rotation shaft is rotated, the fixing blade is configured to move upward, make contact with the two locking protrusion portions and horizontally fix the balancing blade.   
     
     
         7 . The ventilation unit of  claim 2 , wherein the first frame includes a dividing frame configured to divide the first lower ventilation hole and the first upper ventilation hole. 
     
     
         8 . The ventilation unit of  claim 7 , wherein the dividing frame becomes gradually thinner toward one end portion thereof. 
     
     
         9 . The ventilation unit of  claim 1 , wherein stopper strips are formed in a central portion of an inner surface of the first frame and in a central portion of a dividing frame, and the first opening/closing plate is seated on the stopper strips when the first rotation shaft is rotated by a predetermined angle. 
     
     
         10 . The ventilation unit of  claim 9 , wherein protrusion portions are formed in a central portion of an inner surface of the second frame and in a central portion of a lower surface of the second frame,
 heater insertion grooves are provided in the stopper strips and the protrusion portions, and   heaters are fitted to the heater insertion grooves to prevent ice formation in the first and second frames and the first and second opening/closing plates.   
     
     
         11 . The ventilation unit of  claim 1 , wherein the drive control unit includes:
 a first micro switch operatively connected to the first rotation shaft and configured to cut off the opening signal when the first rotation shaft is rotated by a predetermined angle in response to the opening signal;   a second micro switch operatively connected to the first rotation shaft and configured to cut off the closing signal when the first rotation shaft is rotated by a predetermined angle in response to the closing signal; and   a drive circuit including relays respectively connected to the first and second micro switches and configured to stop the reversible motor when one of the opening signal and the closing signal is cut off.   
     
     
         12 . The ventilation unit of  claim 11 , wherein the first ventilation hole includes a first lower ventilation hole and a first upper ventilation hole disposed in a vertical direction, the first rotation shaft including a first lower rotation shaft installed in the first lower ventilation hole and a first upper rotation shaft installed in the first upper ventilation hole, the first opening/closing plate including a first lower opening/closing plate provided in the first lower rotation shaft and a first upper opening/closing plate provided in the first upper rotation shaft. 
     
     
         13 . The ventilation unit of  claim 12 , wherein a first link connected to the first upper rotation shaft is configured to rotate by a predetermined angle in an opening direction with respect to the first upper rotation shaft and then to make contact with the first micro switch to cut off the opening signal, and a second link connected to the first lower rotation shaft is configured to rotate by a predetermined angle in a downward direction with respect to the second lower rotation shaft and then to make contact with the second micro switch to cut off the closing signal. 
     
     
         14 . The ventilation unit of  claim 1 , wherein the second opening/closing plate is configured to be opened when a difference is generated between atmospheric pressures applied to opposite sides of the second opening/closing plate and to be closed when the difference between atmospheric pressures is removed, the second rotation shaft is positioned in an uppermost area of the second ventilation hole, and the second opening/closing plate has a gravity center that is lower than the second rotation shaft so that the second opening/closing plate closes the second ventilation hole by an own weight of the second opening/closing plate. 
     
     
         15 . The ventilation unit of  claim 14 , wherein the second opening/closing plate has a recess region disposed in a lower portion thereof and depressed in a concave shape so as to receive an air pressure, and the second opening/closing plate has a lower end surface that makes contact with a lower horizontal frame, the lower surface formed into a curved surface so as to minimize a frictional resistance between the second opening/closing plate and the lower horizontal frame when opening and closing the second ventilation hole. 
     
     
         16 . The ventilation unit of  claim 1 , wherein the second opening/closing plate is configured to be opened by a difference between atmospheric pressures applied to front and rear sides of the second opening/closing plate and,
 when the difference between atmospheric pressures is removed, the second opening/closing plate is returned to a closed position by a restoring force of a return spring provided in one end portion of the second rotation shaft.   
     
     
         17 . The ventilation unit of  claim 1 , wherein the second opening/closing plate is configured to be opened by a difference between atmospheric pressures applied to front and rear sides of the second opening/closing plate,
 when the difference between atmospheric pressures is removed, the second opening/closing plate is returned to a closed position by a restoring force of a return spring provided in one end portion of the second rotation shaft, and   when the second opening/closing plate comes close to the closed position, air tightness of the second opening/closing plate is enhanced by a magnetic force acting between a first magnetic portion provided in a lower end portion of the second opening/closing plate and a second magnetic portion provided in the second frame in a corresponding relationship with the first magnetic portion.   
     
     
         18 . The ventilation unit of  claim 1 , further comprising:
 a temperature controller configured to supply the opening signal and the closing signal to the reversible motor depending on a temperature of a storeroom in which the ventilation unit is installed.   
     
     
         19 . The ventilation unit of  claim 1 , further comprising:
 a ventilation fan disposed on one side surface of the first frame and configured to discharge or supply an air through the first ventilation hole.   
     
     
         20 . The ventilation unit of  claim 19 , wherein the ventilation fan is configured to operate when the opening signal is supplied and to stop when the closing signal is supplied. 
     
     
         21 . A preservation system, comprising:
 a first storeroom having a heat source;   a second storeroom disposed adjacent to the first storeroom with a wall interposed between the first storeroom and the second storeroom,   a first atmospheric pressure equilibrium ventilation unit installed in the wall and configured to supply an air existing within the first storeroom to the second storeroom; and   a second atmospheric pressure equilibrium ventilation unit installed in the wall near the first atmospheric pressure equilibrium ventilation unit and configured to supply an air existing within the second storeroom to the first storeroom,   wherein at least one of the first and the second atmospheric pressure equilibrium ventilation units include:   a first frame assembly including a first frame configured to define a first ventilation hole, a first rotation shaft installed in the first ventilation hole, and a first opening/closing plate provided in the first rotation shaft and configured to rotate together with the first rotation shaft to open and close the first ventilation hole;   a second frame assembly disposed adjacent to the first frame assembly, the second frame assembly including a second frame configured to define a second ventilation hole, a second rotation shaft installed in the second ventilation hole and a second opening/closing plate provided in the second rotation shaft and configured to rotate together with the second rotation shaft to open and close the second ventilation hole, the second opening/closing plate configured to open the second ventilation hole by being rotated by a difference between atmospheric pressures applied to opposite sides of the second opening/closing plate;   a drive unit connected to the first rotation shaft, the drive unit including a reversible motor configured to rotate the first rotation shaft in a forward direction or a reverse direction in response to an opening signal or a closing signal;   a drive control unit connected to the first rotation shaft and the reversible motor and configured to control the reversible motor by cutting off the opening signal or the closing signal when the first rotation shaft is rotated by a predetermined angle; and   a locking control unit connected to the first rotation shaft and the second rotation shaft and configured to lock the second rotation shaft to keep the second ventilation hole in a closed state when the first rotation shaft is rotated by a predetermined angle in response to the opening signal to open the first ventilation hole.   
     
     
         22 . The system of  claim 21 , wherein the first storeroom is a low-temperature storeroom having a low-temperature heat source, the second storeroom is a heat-receiving low-temperature storeroom, which receives a cold air from the first storeroom, and the heat source of the first storeroom includes a freezer. 
     
     
         23 . The system of  claim 21 , wherein the first storeroom is a heat source warmer cabinet having a heat source, the second storeroom is a heat-receiving warmer cabinet, the heat source of the first storeroom includes a heater and a heat pump. 
     
     
         24 . The system of  claim 21 , further comprising:
 a temperature controller configured to supply the opening signal and the closing signal to the reversible motor depending on internal temperatures of the first and second storeroom.   
     
     
         25 . The system of  claim 21 , wherein at least one of the first and second atmospheric pressure equilibrium ventilation units further includes a ventilation fan disposed on one side surface of the first frame and configured to discharge or supply an air through the first ventilation hole. 
     
     
         26 . The system of  claim 25 , wherein the ventilation fan is configured to operate when the opening signal is supplied and to stop when the closing signal is supplied. 
     
     
         27 . The system of  claim 21 , wherein the first ventilation hole includes a first lower ventilation hole and a first upper ventilation hole disposed in a vertical direction, the first rotation shaft including a first lower rotation shaft installed in the first lower ventilation hole and a first upper rotation shaft installed in the first upper ventilation hole, the first opening/closing plate including a first lower opening/closing plate provided in the first lower rotation shaft and a first upper opening/closing plate provided in the first upper rotation shaft. 
     
     
         28 . The system of  claim 27 , wherein the first upper rotation shaft is connected to a first link, the first lower rotation shaft is connected to a second link, the first link and the second link are interconnected by a connection link, and
 when the first rotation shaft is rotated by a predetermined angle in response to the opening signal, a fixing blade provided in an upper end portion of an extension arm extending from the connection link is configured to push up a locking protrusion portion of a balancing blade formed in one end portion of the second rotation shaft and to hold the balancing blade against movement.   
     
     
         29 . The system of  claim 21 , wherein the drive control unit includes:
 a first micro switch operatively connected to the first rotation shaft and configured to cut off the opening signal when the first rotation shaft is rotated by a predetermined angle in response to the opening signal;   a second micro switch operatively connected to the first rotation shaft and configured to cut off the closing signal when the first rotation shaft is rotated by a predetermined angle in response to the closing signal; and   a drive circuit including relays respectively connected to the first and second micro switches and configured to stop the reversible motor when one of the opening signal and the closing signal is cut off.   
     
     
         30 . The system of  claim 21 , further comprising:
 an external atmospheric pressure equalizer installed in at least one of the first and second storerooms and configured to maintain pressure equilibrium between the inside and outside of the first and second storerooms.   
     
     
         31 . The system of  claim 21 , wherein the first storeroom includes a low-temperature heat source, and
 an atmospheric pressure valve is installed in the second storeroom having a relatively high temperature without installing an external atmospheric pressure equalizer in the first storeroom having a relatively low temperature, so that an external air having a high temperature enters the second storeroom having a relatively high temperature to adjust atmospheric pressures of the first and second storerooms, without directly infiltrating into the first storeroom having a relatively low temperature, thereby preventing a sudden temperature change and a thermal shock otherwise generated when a hot air is directly infiltrated into the first storeroom having a relatively low temperature.   
     
     
         32 . The system of  claim 21 , wherein the first storeroom includes a high-temperature heat source, and
 an atmospheric pressure valve is installed in the second storeroom having a relatively low temperature without installing an external atmospheric pressure equalizer in the first storeroom having a relatively high temperature, so that an external air having a low temperature enters the second storeroom having a relatively low temperature to adjust atmospheric pressures of the first and second storerooms, without directly infiltrating into the first storeroom having a relatively high temperature, thereby preventing a sudden temperature change and an energy loss otherwise generated when a cold air is directly infiltrated into the first storeroom having a relatively high temperature.   
     
     
         33 . The system of  claim 21 , wherein a gas existing within the storerooms is detected, and if the detected gas is a gas generated by fire, the gas existing within the storerooms is discharged to the outside while supplying an external fresh air into the storerooms. 
     
     
         34 . The system of  claim 21 , wherein a gas existing within the storerooms is detected, and if the detected gas is a toxic gas rather than a gas generated by fire, the gas existing within the storerooms is discharged to the outside while supplying a pre-prepared oxygen gas or a gas capable of neutralizing the toxic gas into the storerooms.