Air-conditioning device

Abstract

Provided is a vehicle air-conditioning device including: a compressor that compresses a refrigerant; a heating unit that heats an object to be heated by the refrigerant discharged from the compressor; an accumulator that separates liquid content in the refrigerant taken in by the compressor; a circulation flow path that guides the refrigerant that has passed through the heating unit to the accumulator; a bypass flow path that joins the refrigerant discharged from the compressor without passing through the heating unit at a first joining part of the circulation flow path; an expansion valve that is disposed on the circulation flow path and that reduces the pressure of the refrigerant flowing out from the heating unit; and an expansion valve that is disposed on the bypass flow path and that reduces the pressure of the refrigerant discharged from the compressor. The first joining part is disposed: more to the accumulator side than the expansion valve of the circulation flow path; and in a first spray area of the refrigerant by the expansion valve.

1 . An air-conditioning device comprising:
 a compressor that compresses a refrigerant;   a heating unit that heats a heating target with the refrigerant discharged from the compressor;   an accumulator that separates a liquid component in the refrigerant sucked by the compressor;   a circulation flow path that guides the refrigerant, which has passed through the heating unit, to the accumulator;   a bypass flow path that merges the refrigerant, which does not pass through the heating unit and which is discharged from the compressor, at a first merging portion of the circulation flow path;   a first expansion mechanism that is disposed at the circulation flow path and that expands the refrigerant flowing out from the heating unit; and   a second expansion mechanism that is disposed at the bypass flow path and that expands the refrigerant discharged from the compressor,   wherein the first merging portion is disposed between the accumulator and the first expansion mechanism of the circulation flow path and is disposed in a first spray region of the refrigerant for the first expansion mechanism.   
     
     
         2 . The air-conditioning device according to  claim 1 , further comprising:
 a third expansion mechanism that is disposed between the accumulator and the first expansion mechanism of the circulation flow path.   
     
     
         3 . The air-conditioning device according to  claim 1 , further comprising:
 a branch flow path that branches a part of the refrigerant from the bypass flow path and that merges in the circulation flow path at a second merging portion between the accumulator and the first merging portion of the circulation flow path.   
     
     
         4 . The air-conditioning device according to  claim 1 , further comprising:
 a third expansion mechanism that is disposed between the accumulator and the first expansion mechanism of the circulation flow path; and   a branch flow path that branches a part of the refrigerant from the bypass flow path and that merges in the circulation flow path at a second merging portion between the accumulator and the first merging portion of the circulation flow path,   wherein the second merging portion is disposed between the accumulator and the third expansion mechanism of the circulation flow path and in a second spray region of the refrigerant for the third expansion mechanism.   
     
     
         5 . The air-conditioning device according to  claim 2 ,
 wherein the third expansion mechanism is an orifice in which a flow path sectional area of a part of a pipe forming the circulation flow path is smaller than a flow path sectional area of the other part.   
     
     
         6 . The air-conditioning device according to  claim 1 ,
 wherein at the first merging portion, in a case where the circulation flow path is viewed along a central axis of the circulation flow path, the bypass flow path is connected to the circulation flow path such that a central axis of the bypass flow path and the central axis of the circulation flow path do not intersect each other.   
     
     
         7 . The air-conditioning device according to  claim 3 ,
 wherein at the second merging portion, in a case where the circulation flow path is viewed along a central axis of the circulation flow path, the branch flow path is connected to the circulation flow path such that a central axis of the bypass flow path and the central axis of the circulation flow path do not intersect each other.   
     
     
         8 . The air-conditioning device according to  claim 1 ,
 wherein at the first merging portion, in a case where the circulation flow path is viewed from a predetermined direction orthogonal to a central axis of the circulation flow path, the bypass flow path is connected to the circulation flow path such that an angle formed by the central axis of the circulation flow path and a central axis of the bypass flow path is 90 degrees or more and 180 degrees or less.   
     
     
         9 . The air-conditioning device according to  claim 3 ,
 wherein at the second merging portion, in a case where the circulation flow path is viewed from a predetermined direction orthogonal to a central axis of the circulation flow path, the branch flow path is connected to the circulation flow path such that an angle formed by the central axis of the circulation flow path and a central axis of the branch flow path is 90 degrees or more and 180 degrees or less.   
     
     
         10 . The air-conditioning device according to  claim 3 ,
 wherein in a case where the circulation flow path is viewed from a predetermined direction orthogonal to a central axis of the circulation flow path, a first inflow direction in which the refrigerant flows from the bypass flow path into the circulation flow path at the first merging portion and a second inflow direction in which the refrigerant flows from the branch flow path into the circulation flow path at the second merging portion face each other.   
     
     
         11 . The air-conditioning device according to  claim 1 ,
 wherein at the first merging portion, convex portions are formed on an inner peripheral surface of the circulation flow path at a plurality of locations along a circumferential direction around a central axis of the circulation flow path.   
     
     
         12 . The air-conditioning device according to  claim 3 ,
 wherein at the second merging portion, convex portions are formed on an inner peripheral surface of the circulation flow path at a plurality of locations along a circumferential direction around a central axis of the circulation flow path.   
     
     
         13 . The air-conditioning device according to  claim 1 ,
 wherein at the first merging portion, a central axis of the circulation flow path is disposed along a vertical direction.   
     
     
         14 . The air-conditioning device according to  claim 3 ,
 wherein at the second merging portion, a central axis of the circulation flow path is disposed along a vertical direction.   
     
     
         15 . The air-conditioning device according to  claim 1 ,
 wherein in a case where an inner diameter of a pipe forming the circulation flow path is denoted by D, the first spray region is a region within  10 D from the first expansion mechanism.   
     
     
         16 . The air-conditioning device according to  claim 4 ,
 wherein in a case where an inner diameter of a pipe forming the circulation flow path is denoted by D, the second spray region is a region within 10 D from the third expansion mechanism.