Water discharge device

Abstract

There is provided a water discharge device including: a first member including an injection port; a second member including a streaming flow channel with a streaming discharge port, and a shower flow channel with a shower discharge port; and a flow channel switching mechanism. The shower flow channel includes an air intake section, a storage section of water with bubbles, a backflow prevention section, the shower discharge port, and a positional displacement prevention section that prevents at least a part of a projected plane, formed by projecting a downstream end of the injection port in an injection direction, from being displaced outside the backflow prevention section due to an impact caused by the water injected through the injection port, in a state where water at a maximum flow rate is supplied into the injection port, and the entire projected plane passes through an inside of the backflow prevention section.

What is claimed is: 
     
         1 . A water discharge device comprising:
 a first member that is provided with an injection port through which water flowing from an upstream side is injected to a downstream side by being increased in flow velocity;   a second member that includes a streaming flow channel provided with a streaming discharge port through which a single water stream is discharged, and a shower flow channel provided with a shower discharge port through which a plurality of water streams are discharged;   a flow channel switching mechanism that switches between a first state of allowing water injected through the injection port to flow into the streaming flow channel, and a second state of allowing the water injected through the injection port to flow into the shower flow channel, by moving either one of the first member and the second member,   the shower flow channel including:
 an air intake section through which air is sucked in by using a vacuum created as the water injected through the injection port passes through the air intake section; 
 a storage section of water with bubbles that is provided downstream of the air intake section to store water with bubbles produced by mixing of air sucked in through the air intake section into the water injected through the injection port; 
 a backflow prevention section that is provided between the air intake section and the storage section of water with bubbles, with a flow channel cross-sectional area larger than that of the injection port as well as smaller than that of the storage section of water with bubbles, to prevent backflow of water with bubbles from the storage section of water with bubbles toward the air intake section; 
 the shower discharge port through which water with bubbles stored in the storage section of water with bubbles is discharged; and 
 a positional displacement prevention section that prevents at least a part of a projected plane, formed by projecting a downstream end of the injection port in an injection direction, from being displaced outside the backflow prevention section due to an impact caused by the water injected through the injection port, in a state where water at a maximum flow rate is supplied into the injection port, and the entire projected plane passes through an inside of the backflow prevention section. 
   
     
     
         2 . The water discharge device according to  claim 1 , wherein the flow channel switching mechanism moves either one of the first member and the second member in a first direction when switching the first state to the second state, and wherein the positional displacement prevention section is provided in the storage section of water with bubbles, and includes a guide portion for guiding the water injected through the injection port to a direction different from the first direction. 
     
     
         3 . The water discharge device according to  claim 2 , wherein the guide portion is arranged at a position interfering with the projected plane. 
     
     
         4 . The water discharge device according to  claim 3 , wherein the positional displacement prevention section is provided in a connection portion between the first member and the second member, and includes an elastic member that serves as movement resistance when either one of the first member and the second member is moved. 
     
     
         5 . The water discharge device according to  claim 4 , wherein the elastic member includes a first region to be a first resistance, and a second region to be a second resistance less than the first resistance, in a moving range when the first state and the second state are switched by the flow channel switching mechanism, and wherein a position at which the entire projected plane passes through the inside of the backflow prevention section is within the first region. 
     
     
         6 . The water discharge device according to  claim 3 , wherein the positional displacement prevention section is acquired by forming the backflow prevention section in a flat shape in flow channel cross section so that a longitudinal direction of the flat shape is a movement direction when the first state and the second state are switched. 
     
     
         7 . The water discharge device according to  claim 3 , wherein the positional displacement prevention section is acquired by forming the backflow prevention section in a shape in which a flow channel cross-sectional area decreases from an upstream side to a downstream side.