JP2013256964A - Refrigerant switching valve and device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant switching valve having improved refrigerant switching performance, and to enable a refrigerant to be switched according to an actual use state of a device including the same.SOLUTION: A switching valve includes a valve element 74, valve element driving means 60 and 67 for driving the valve element 74, a case 59 in which the valve element 74 resides, a valve seat 64 disposed at one end of the case 59, a flow-in tube 65 having one end opened into and connected to the case 59 of the valve seat 64, a first communication tube 66b, a second communication tube 66c, and a third communication tube 66d. The valve element 74 switches a first state in which the flow-in tube 65 and the first communication tube 66b are communicated with each other and the second communication tube 66c and the third communication tube 66d are communicated with each other, a second state in which the first communication tube 66b and the second communication tube 66c are communicated with each other and the third communication tube 66d is closed, and a third state in which the flow-in tube 65 and the third communication tube 66d are communicated with each other and the first communication tube 66b and the second communication tube 66c are closed.

Description

  The present invention relates to a refrigerant switching valve and a device including the same.

  As background arts in this technical field, Japanese Patent Application Laid-Open No. 2009-79837 (Patent Document 1), Japanese Patent No. 4694124 (Patent Document 2), Japanese Patent No. 4786822 (Patent Document 3), and Japanese Patent No. 3997036 (Patent Document) There is literature 4).

  In Patent Document 1, “a refrigerator is an insulating box having an opening, an insulating partition for dividing the inside of the insulating box into a plurality of storage rooms, an insulating door, a refrigerant pipe, a compressor, A heat insulating partition that is provided with a condenser and a first flow path for circulating refrigerant from the compressor to the condenser, and the heat insulating partition faces the heat insulating door when the heat insulating door closes the opening. The front part further includes a partition dew condensation prevention pipe for circulating the refrigerant around the front surface of the heat insulating partition part, and the refrigerant is circulated through the first flow path or the partition part dew prevention pipe from the compressor. It is disclosed that the electromagnetic four-way valve for switching whether the refrigerant is allowed to flow through to the condenser ”(Solution means column in the summary).

  Patent Document 2 states that “a valve opening having an inflow pipe for allowing fluid to flow in and an outflow pipe for allowing fluid to flow out, forming part of the passage of the fluid, and being connected to the inflow pipe or the outflow pipe therein. A valve drive device having a main body in which a valve body that opens and closes the flow of fluid and interrupts the flow of the fluid is provided, and a drive means for driving the valve body. A plurality of valve bodies are provided so that one valve body corresponds to each port, and driven gears for driving the plurality of valve bodies are formed, and all of the plurality of the driven gears are always in common. It is arranged on the outer periphery of one driving gear in meshing arrangement, and the driving gear is driven by the driving means so as to drive the plurality of driven gears at the same time. Interfere with the driving gear A valve driving device characterized in that a blocking portion for limiting rotation is provided, and one of the blocking portions for limiting rotation of the driving gear and the other blocking portion are provided in different driven gears. (Claim 1).

  Patent Document 3 discloses that “a single inlet port always communicating with the valve chamber and the valve chamber, and a first outlet port and a second outlet port that are opened at positions apart from each other on the flat bottom surface of the valve chamber. And a valve housing having a third outlet port; provided in the valve chamber so as to be capable of rotational displacement; and on an end surface facing the bottom surface of the valve chamber, the valve chamber and the first to third outlet ports; A port opening / closing shape portion that cuts off communication between the valve chamber and the first to third outlet ports by relative displacement of the port opening / closing shape portion with respect to the first to third outlet ports due to rotational displacement. A valve body that switches communication between the outlet port and the valve body; and an electric actuator that rotationally drives the valve body in a stepwise manner. Outlet port and said A first switching position where communication between the three outlet ports and the valve chamber is interrupted and only the first outlet port is communicated with the valve chamber; the first outlet port and the third outlet port; A second switching position that blocks communication with the valve chamber and allows only the second outlet port to communicate with the valve chamber; the first outlet port; the second outlet port; and the third outlet port. And a third switching position for blocking all communication between the valve chamber and the first outlet port, the second outlet port, and the valve chamber for blocking only the third outlet port. The fourth switching position that communicates with the valve chamber, the communication between the third outlet port and the valve chamber is blocked, and both the first outlet port and the second outlet port are connected to the valve chamber. An electric type characterized in that the switching operation is performed between the fifth switching position and the fifth switching position. Write switching valve. "Is disclosed (claim 1).

  Patent Document 4 includes “a compressor, a heat exchanger, a throttle, and a refrigeration cycle that includes a flow path switching valve, and includes a suction port for sucking fluid and a discharge port for discharging fluid, When the moving member moves between the first location and the second location within the housing of the flow path switching valve having two switching ports, the suction portion is located at the first location of the moving member. A port and one of the two switching ports communicate with each other within the housing, and the discharge port and the other switching port of the two switching ports communicate with the interior of the housing. In the second location of the moving member, the suction port and the other switching port of the two switching ports are communicated with each other inside the housing. A flow path switching valve in which the discharge port and one of the two switching ports communicate with each other inside the housing, wherein the moving member is moved by the operation and stop of the compressor. Moving means for moving between the first location and the second location using power generated by at least one change among the pressure, differential pressure, and flow rate of the fluid in the path switching valve, The housing is formed in a cylindrical shape, and at least the two switching ports are formed in a valve seat on one end side in the central axis direction of the housing, and the moving member is accommodated in the housing. The main valve body is configured to be rotatable around the central axis, and one of the two switching ports is selectively connected to the suction port. The main valve body is moved between the first location and the second location by being rotationally displaced around the central axis, and the first valve of the main valve disc is formed. In the place, either one of the two switching ports is communicated to the suction port by the communicating means, and in the second place of the main valve body, the communicating means allows the A flow path switching valve characterized in that one of the two switching ports is connected to the suction port. "(Claim 1).

JP 2009-79837 A Japanese Patent No. 4694124 Japanese Patent No. 4786822 Japanese Patent No. 3997036

  In the configuration described in Patent Document 1, since the refrigerant passing through the partition dew condensation prevention pipe is high-temperature and high-pressure and has a large temperature difference from the periphery of the refrigerator main body opening, the amount of heat of the refrigerant moving to the refrigerator main body opening is small. There is a risk that the temperature in the refrigerator will increase and the amount of energy used will increase.

  Next, in the configuration described in Patent Document 2, since a plurality of valve bodies are required to open and close the plurality of valve openings, the number of parts increases and the configuration becomes complicated.

  Next, Patent Document 3 discloses a position (first switching position, second switching position, fourth switching position) in which only one of the three outlet ports communicates with the inlet port, Although the position where the outlet port is closed simultaneously (third switching position), the position where one outlet port is shut off and the other two outlet ports communicate with the inlet port (fifth switching position) is described. The communication state of each port other than that (other than the position where the outlet port communicates with the inlet port or the position where it is blocked) is not described.

  Next, in the configuration described in Patent Document 4, one of the three discharge ports is connected to the suction port, and the other two discharge ports are connected to each other so that upstream and downstream of the two heat exchangers Can be switched between cooling and heating, but the other communication states are not described.

  In view of the above problems, an object of the present invention is to provide a refrigerant switching valve with improved refrigerant switching performance. It is another object of the present invention to enable switching of the refrigerant in accordance with the actual use state of the device provided with the refrigerant switching valve.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. To give an example, a valve body, a valve body driving means for driving the valve body, a case in which the valve body is included, A valve seat provided at one end, an inflow pipe connected to the inside of the case of the valve seat by opening one end, a first communication pipe, a second communication pipe, and a third communication pipe, The valve body communicates the inflow pipe and the first communication pipe, the first state in which the second communication pipe and the third communication pipe are communicated, and the first communication pipe, A second state in which the second communication pipe is communicated and the third communication pipe is closed; the inflow pipe and the third communication pipe are communicated; and the first communication pipe and the first communication pipe It is characterized by switching between a third state in which the second communication pipe is closed.

  According to the present invention, it is possible to provide a refrigerant switching valve with improved refrigerant switching performance. In addition, the refrigerant can be switched in accordance with the actual use state of the device provided with the refrigerant switching valve.

It is the figure which looked at the refrigerator main body in embodiment of this invention from the front. It is EE sectional drawing of FIG. It is a front view showing the structure in the store | warehouse | chamber of a refrigerator. FIG. 3 is an enlarged explanatory view of a main part of FIG. 2. It is a block diagram which shows the 1st mode of the refrigerant circuit in embodiment of this invention. It is a block diagram which shows the 2nd mode of the refrigerant circuit in embodiment of this invention. It is a block diagram which shows the 3rd mode of the refrigerant circuit in embodiment of this invention. It is a perspective view which shows the external appearance of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is FF sectional drawing of FIG. 8 which shows the structure of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is a G direction arrow line view of Drawing 8 showing the composition of the refrigerant change valve in a first embodiment of the present invention. It is a perspective view which shows the internal structure of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is a perspective view which shows the internal structure of the 1st state of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is a perspective view which shows the internal structure of the 2nd state of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is a perspective view which shows the internal structure of the 3rd state of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is a disassembled perspective view which shows the structure of the valve body and rotor drive part of a refrigerant | coolant switching valve in 1st embodiment of this invention. It is a perspective view which shows the structure of the valve body of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is HH sectional drawing of FIG. 14 which shows the structure of the refrigerant | coolant switching valve in 1st embodiment of this invention. It is explanatory drawing which shows the 1st state of the refrigerant | coolant switching valve in 1st embodiment of this invention. Is K ₁ -K ₁ cross-sectional view of FIG. 18A showing a configuration of a refrigerant switching valve in the first embodiment of the present invention. It is explanatory drawing which shows the 2nd state of the refrigerant | coolant switching valve in 1st embodiment of this invention. Is K ₂ -K ₂ cross-sectional view of FIG. 19A showing a configuration of a refrigerant switching valve in the second embodiment of the present invention. It is explanatory drawing which shows the 3rd state of the refrigerant | coolant switching valve in 3rd embodiment of this invention. Is K ₃ -K ₃ cross-sectional view of Figure 20A showing the arrangement of a refrigerant switching valve in a third embodiment of the present invention. It is explanatory drawing which shows the structure and operation | movement of a refrigerant | coolant switching valve in 2nd embodiment of this invention. It is explanatory drawing which shows the structure and operation | movement of a refrigerant | coolant switching valve in 3rd embodiment of this invention. It is explanatory drawing which shows the structure and operation | movement of a refrigerant | coolant switching valve in 4th embodiment of this invention. It is explanatory drawing which shows the structure and operation | movement of a refrigerant | coolant switching valve in 5th embodiment of this invention. It is explanatory drawing which shows the structure of the refrigerant | coolant switching valve in 6th embodiment of this invention. The operation of the refrigerant switching valve of the sixth embodiment of the present invention is a K ₄ -K ₄ cross-sectional view of FIG. 25A showing. It is explanatory drawing which shows the structure and operation | movement of a refrigerant | coolant switching valve in 6th embodiment of this invention. A K ₅ -K ₅ cross-sectional view of Figure 26A showing the operation of the refrigerant switching valve of the sixth embodiment of the present invention. It is sectional drawing which shows the structure of the refrigerant | coolant switching valve in 7th embodiment of this invention. It is a disassembled perspective view which shows the internal structure of the refrigerant | coolant switching valve in 7th embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<Overall configuration of refrigerator body 1>
FIG. 1 is a front view of a refrigerator according to this embodiment as viewed from the front, that is, a front view of the refrigerator. FIG. 2 is a cross-sectional view taken along line EE in FIG. FIG. 3 is a front view illustrating the configuration inside the refrigerator. FIG. 4 is an enlarged explanatory view of the main part of FIG. 2 and shows the arrangement of the cold air duct and the air outlet.

  As shown in FIG. 1, the refrigerator main body 1 of this embodiment has the refrigerator compartment 2, the ice making room 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 arranged from right to left. As an example, the refrigerator compartment 2 and the vegetable compartment 6 are storage rooms in a refrigerator temperature zone of approximately 3 to 5 ° C. Further, the ice making room 3, the upper freezer room 4, and the lower freezer room 5 are storage rooms in a freezing temperature zone of approximately −18 ° C.

  The refrigerating room 2 is provided with a folding door (so-called French type) refrigerating room doors 2a and 2b divided into left and right sides on the front side. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 include a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a, respectively. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a may be simply referred to as doors 2a, 2b, 3a, 4a, 5a, and 6a. is there.

  The refrigerator body 1 includes a door sensor (not shown) that detects the open / closed state of the doors 2a, 2b, 3a, 4a, 5a, and 6a, and a state in which each door is determined to be open for a predetermined time, For example, an alarm (not shown) for notifying the user when the operation is continued for one minute or more and a temperature setting device (operation unit for setting the temperature of the refrigerator compartment 2 and the temperature of the upper freezer compartment 4 and the lower freezer compartment 5) And a control panel 36) provided with a display portion.

  As shown in FIG. 2, the outside of the refrigerator body 1 and the inside of the refrigerator are separated by a heat insulating box 10 formed by filling a foam heat insulating material (foamed polyurethane) between the inner box 10a and the outer box 10b. It has been. Moreover, the heat insulation box 10 of the refrigerator main body 1 is mounted with a plurality of vacuum heat insulating materials 18.

  In the warehouse, a plurality of storage chambers arranged in the vertical direction with different temperature zones are partitioned by heat insulation partition walls 12 in an adiabatic manner. That is, the refrigerator compartment 2 is separated from the upper freezer compartment 4 and the ice making chamber 3 (see FIG. 1, the ice making chamber 3 is not shown in FIG. 2) by the upper heat insulating partition wall 12a, and by the lower heat insulating partition wall 12b. The lower freezer compartment 5 and the vegetable compartment 6 are separated.

  A plurality of door pockets 14 are provided on the inner side of the doors 2a and 2b (see FIGS. 1 and 2). The refrigerator compartment 2 is partitioned into a plurality of storage spaces in the vertical direction by a plurality of shelves 13.

  As shown in FIG. 2, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 have storage containers 4b, 5b, 6b behind the doors 4a, 5a, 6a provided in front of the respective storage compartments. Each is provided. The storage containers 4b, 5b, and 6b can be pulled out by placing a hand on a handle portion (not shown) of the doors 4a, 5a, and 6a and pulling it out to the front side. Similarly, the ice making chamber 3 shown in FIG. 1 is provided with a storage container (indicated by (3b) in FIG. 2) integrally with the door 3a, and a hand is pulled on a handle portion (not shown) of the door 3a and pulled out to the front side. Thus, the storage container 3b can be pulled out.

<Door packing>
The doors 2a, 2b, 3a, 4a, 5a, 6a are provided with door packings 22 around them, and when each door is closed, the inside of the storage space is closed by closely contacting with the opening peripheral edge of the front surface 23 of the refrigerator body. In order to prevent leakage of cold air from the storage space to the outside.

  When each door is opened, outside air comes into contact with the opening peripheral edge of the front surface 23 of the refrigerator body.

  In particular, since the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 are below freezing temperature zones, when the ice making door 3a, the upper freezing door 4a, and the lower freezing door 5a are opened, the front surface of the refrigerator body When outside air touches the opening periphery of 23 and cools, it becomes below a dew point and it will be in the state which tends to dew condensation on the refrigerator main body front surface 23. Furthermore, if the doors 3a, 4a and 5a are closed in the dewed state, and water droplets between the door packing 22 and the refrigerator main body front surface 23 are cooled below freezing point, they may freeze.

  Therefore, in order to avoid dew condensation and freezing, the refrigerant that has been compressed and heated by the compressor and passed through the condenser is passed through the opening peripheral portions of the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5. Refrigerant piping is buried. Since this refrigerant pipe has a function of preventing the condensation and freezing by heating the opening peripheral portion of the front surface 23 of the refrigerator main body, it is hereinafter referred to as a “condensation prevention pipe 24”.

  In the present embodiment, the dew condensation prevention pipe 24 is provided at the peripheral edges of the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5. Similarly, the effect of preventing condensation can be obtained.

  As shown in FIG. 2 (see FIG. 3 as appropriate), the cooler 7 is provided in a cooler storage chamber 8 provided substantially at the back of the lower freezing chamber 5. Above the cooler 7, a blower 9 (for example, a fan driven by a motor. To clarify the distinction from the external blower 26, it is referred to as “internal fan 9”). The air cooled by the heat exchange in the cooler 7 (hereinafter, the low-temperature air heat-exchanged by the cooler 7 is referred to as “cold air”) is blown by the blower 9 into the refrigerator compartment air duct 11, the vegetable compartment air duct 17, and the ice making room. The refrigeration room 2, the vegetable room 6, the ice making room 3, the upper freezing room 4, and the lower freezing room 5 are sent to the storage rooms via the air duct 40a, the upper freezer room air duct 40b, and the lower freezer room air duct 41.

  The amount of cool air blown into each storage room is controlled by the refrigeration temperature zone cool air control means 20 and the freezing temperature zone room cool air control means 21.

  Here, the refrigeration temperature chamber cold air control means 20 is a so-called twin damper having two independent openings, and the first opening 20a controls the air flow to the refrigeration room air duct 11 and the second opening. 20b is a structure which controls ventilation to the vegetable compartment ventilation duct 17. FIG. The refrigeration temperature chamber cold air control means 21 is a single damper having a single opening, and is configured to control the air blowing to the ice making room air duct 40a, the upper freezer room air duct 40b, and the lower stage freezer room air duct 41. It is.

  Incidentally, the air ducts to the refrigerator compartment 2, the ice making room 3, the upper freezer room 4, the lower freezer room 5, and the vegetable room 6 are provided on the back side of each storage room of the refrigerator body 1 as shown by broken lines in FIG. It has been.

  Specifically, when the first opening 20a of the twin damper 20 is in the open state and the single damper 21 is in the closed state, the cold air passes from the outlet 2c provided in multiple stages through the refrigerator compartment air duct 11 to the refrigerator compartment 2. Sent. When the second opening 20b of the refrigeration temperature zone cool air control means 20 is open and the refrigeration temperature zone cool air control means 21 is closed, the cool air passes through the vegetable room air duct 17 and is fed from the outlet 6c to the vegetable compartment 6c. Sent to.

  The cold air that has cooled the refrigerating chamber 2 is, for example, in the lower right portion as viewed from the front of the cooler storage chamber 8 through the refrigerating chamber return duct 16 from the return port 2d provided in the lower portion of the refrigerating chamber 2. Return. The return air from the vegetable compartment 6 returns to the lower part of the cooler storage compartment 8 through the return opening 6d.

  When the single damper 21 is in the open state, the cold air heat-exchanged by the cooler 7 passes through the ice making chamber air duct 40a and the upper freezer compartment air duct 40b by the internal fan 9, and the ice making chamber 3, from the air outlets 3c and 4c, respectively. Air is blown into the upper freezer compartment 4. Further, the air is blown from the outlet 5 c to the lower freezer compartment 5 through the lower freezer compartment air duct 13. The single damper 21 is attached above a blower cover 56 described later, and facilitates air blowing to the ice making chamber 3.

  In addition, the cold air that has cooled the upper freezer room 4, the lower freezer room 5, and the ice making room 3 returns to the cooler storage room 8 through the freezer return port 42 provided in the lower part of the lower freezer room 5.

  In FIG. 4, the refrigerating temperature zone back partition 54 is formed with outlets 3c, 4c, and 5c. The freezing temperature zone back partition 54 partitions the upper freezing chamber 4, the ice making chamber 3 and the lower freezing chamber 5, and the cooler storage chamber 8.

  The blower 9 is attached to the blower support portion 55. The blower support portion 55 partitions the cooler storage chamber 8 and the freezing temperature zone back partition 54.

  A blower cover 56 covers the front surface of the blower 9. Between the blower cover 56 and the freezing temperature zone compartment back partition 54, an ice making chamber blow duct 40a, an upper freezer compartment blow duct 40b for guiding the cool air blown by the blower 9 to the blowout ports 3c, 4c, 5c, and A lower freezer compartment air duct 41 is formed. Further, a blower outlet 56a is formed in the upper part of the blower cover 56, and the refrigerating temperature zone cold air control means 21 is provided in the blower outlet 56a.

  The blower cover 56 includes a rectifying unit 56 b on the front surface of the blower 9. This rectifies the turbulent flow caused by the cold air blown out and prevents the generation of noise.

  Further, the blower cover 56 also plays a role of blowing the cold air blown by the blower 9 toward the refrigerating temperature zone cold air control means 20 side. That is, the cold air that does not flow to the refrigeration temperature zone cold air control means 21 side provided in the blower cover 56 is moved to the refrigeration temperature zone room cold air control means 20 side via the cold room upstream duct 11a as shown in FIG. Led.

  And it passed through the cooler 7 to the storage room of the temperature zone from which the freezing temperature zone room (the upper freezing room 4, the lower freezing room 5, and the ice making room 3) and the refrigeration temperature zone room (the refrigeration room 2 and the vegetable room 6) differs. When the cool air is sent, most of the cool air is sent to the freezing temperature zone chamber cool air control means 21 side, and the remaining other cool air is guided to the refrigerating temperature zone room cool air control means 20 side.

  Furthermore, when only the first opening 20a of the twin damper 20 is open, the cold air led to the refrigerating room upstream duct 11a is led to the refrigerating room air duct 11 and only the second opening 20b is opened. If the first opening 20a and the second opening 20b are both open, the air is led to both the refrigerator compartment air duct 11 and the vegetable room air duct 17. It is burned.

  The twin damper 20 is attached to the rear of the refrigerator compartment 2 as shown in FIG.

  Further, a defrost heater 46 as a defrosting unit is installed below the cooler 7, and in order to prevent defrost water from dripping onto the defrost heater 46 above the defrost heater 46. An upper cover 47 is provided.

  The defrost water generated by the defrosting (melting) of the frost attached to the wall of the cooler 7 and the surrounding cooler storage chamber 8 flows into the eaves 43 provided at the lower part of the cooler storage chamber 8, It reaches the evaporating dish 44 disposed in the machine room 19 through the drain pipe 15 and is evaporated by the heat of the compressor 45 and the condenser 25.

  Further, when viewed from the front of the cooler 7, the cooler temperature sensor 35 is located in the upper right part, the refrigerating room temperature sensor 33 is located in the refrigerating room 2, the freezing room temperature sensor 34 is located in the lower freezing room 5, and the ice making room 3 Temperature sensors 39 are provided, respectively. The temperature of the cooler 7 (hereinafter referred to as “cooler temperature”), the temperature of the refrigerator compartment 2 (hereinafter referred to as “refrigerator compartment temperature”), and the temperature of the lower freezer compartment 5 (referred to as “cooler temperature”). Hereinafter, a temperature in the vicinity of an ice tray (not shown) (hereinafter referred to as “ice-making temperature”) can be detected.

  Furthermore, the refrigerator main body 1 includes an outside air temperature sensor 29 and an outside air humidity sensor 30 that detect a temperature and humidity environment (outside air temperature, outside air humidity) outside the refrigerator. In addition, the vegetable compartment temperature sensor 33a may be arranged also in the vegetable compartment 6, and thereby the temperature control of each storage compartment can be performed more finely.

<Machine room configuration>
A machine room 19 is provided on the lower back side of the heat insulating box 10. The configuration and the refrigerant path will be described with reference to FIG. The high-temperature and high-pressure refrigerant compressed by the compressor 45 passes through the condenser 25, which is a heat exchanger, and is radiated and cooled by the external fan 26, and then passes through the first refrigerant pipe 48 and the refrigerant switching valve 27. Flows into the condensation prevention pipe 24. The temperature of the refrigerant flowing in the dew condensation prevention pipe 24 is higher than the outside temperature. For example, when the outside temperature is 30 ° C., the temperature of the refrigerant is about 33 ° C., so that condensation occurs on the surface even if it is exposed to the outside air. Is suppressed.

  As described above, the dew condensation prevention pipe 24 is embedded along the peripheral edges of the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5. The refrigerant passes through the dew condensation prevention pipe 24, then passes through the refrigerant switching valve 27, passes through the pressure reducing means 28 that is a thin tube, and flows into the cooler pipe 7 a from the outlet of the pressure reducing means 28. The refrigerant flowing into the cooler pipe 7a suddenly decreases in pressure and temperature due to adiabatic expansion, and the low-temperature refrigerant is sent to the cooler 7, which is an evaporator, to exchange heat with the air around the cooler 7, Thereafter, the air is sucked into the compressor 45 through the second refrigerant pipe 49 from the cooler 7 and compressed.

  Although the above description is about the first mode in which the refrigerant passes through the condensation prevention pipe 24, in this embodiment, the mode in which the refrigerant does not pass through the condensation prevention pipe 24 by the switching operation of the refrigerant switching valve 27 (third Mode) can be selected. Details thereof will be described later.

  Incidentally, in this embodiment, isobutane is used as a refrigerant, and the amount of refrigerant enclosed is as small as about 80 g.

  On the upper surface side of the ceiling wall of the refrigerator main body 1, a control board 31 that is a control means equipped with a CPU, a memory such as a ROM and a RAM, an interface circuit, and the like is disposed as a control means. The control board 31 includes the above-described outside air temperature sensor 29, outside air humidity sensor 30, cooler temperature sensor 35, refrigerating room temperature sensor 33, freezer room temperature sensor 34, ice making room temperature sensor 39, doors 2a, 2b, 3a, 4a, It connects with the door panel which detects the open / closed state of 5a, 6a, respectively, and the control panel provided in the refrigerator compartment door 2a. Then, according to the program previously installed in the ROM, the compressor 45 is turned ON / OFF, the rotational speed is controlled, the refrigeration temperature chamber cold air control means 20 and the refrigeration temperature zone cold air control means 21 are individually driven. Control of drive motor, ON / OFF of internal fan 9 and control of rotational speed, control of ON / OFF of external fan 26, rotational speed, etc., ON / OFF of alarm to notify door open state, refrigerant switching valve 27 The switching operation is controlled.

  Next, only the refrigeration temperature zone chambers (the ice making chamber 3, the upper freezing chamber 4 and the lower freezing chamber 5) with the refrigeration temperature zone cold air control means 20 in the shut-off state and the freezing temperature zone cold air control means 21 in the blown state. When cooling is performed, the cool air blown to the ice making chamber 3 via the ice making chamber air duct 40a and the cool air blown to the upper freezer chamber 4 via the upper freezer chamber air duct 40b are To descend. And it flows like the freezing room return air shown by the arrow c in FIG. 4 with the cold air ventilated to the lower freezing room 5 via the lower freezing room ventilation duct 41 (refer FIG. 2). That is, it flows into the cooler storage chamber 8 from the lower front of the cooler storage chamber 8 via the freezer return port 42 arranged at the lower back of the lower freezing chamber 5, and a large number of fins are attached to the cooler piping 7a. Heat exchange is performed with the cooler 7 configured as described above.

  Incidentally, the width dimension of the freezer return port 42 is a width substantially equal to the width dimension of the cooler 7.

  On the other hand, only the refrigeration temperature zone chamber (the refrigeration chamber 2 and / or the vegetable compartment 6) is cooled while the refrigeration temperature zone chamber cool air control means 20 is in the blowing state and the refrigeration temperature zone chamber cool air control means 21 is shut off. In this case, the return cold air from the refrigerating chamber 2 is supplied to the cooler from the lower side of the cooler storage chamber 8 via the refrigerating chamber return duct 16 like the refrigerating chamber return air indicated by the arrow d in FIG. It flows into the storage chamber 8 and exchanges heat with the cooler 7.

  The cold air that has cooled the vegetable compartment 6 via the second opening 20b of the twin damper 20 flows into the lower part of the cooler storage compartment 8 via the vegetable compartment return port 6d as shown in FIG. The air volume is smaller than the air volume circulating in the freezing temperature zone and the air volume circulating in the refrigerator compartment 2.

  As described above, switching of the cool air to be blown to each storage chamber of the refrigerator body 1 is performed by appropriately opening and closing each of the refrigeration temperature zone cool air control means 20 and the freezing temperature zone room cool air control means 21. is there.

<First embodiment>
Next, the refrigerant path switching operation using the refrigerant switching valve 27 according to the first embodiment of the present invention will be described with reference to FIGS. 5 to 7 are block diagrams showing each mode of the refrigerant circuit in the embodiment of the present invention. FIG. 5 shows the first mode, FIG. 6 shows the second mode, and FIG. 7 shows the third mode. The open / close state of the refrigerant switching valve 27 is different and the refrigerant path is different.

  The refrigerant switching valve 27 is a so-called four-way valve including four communication pipes, one inflow port A, and three communication ports B, C, and D.

  A first refrigerant pipe 48 is connected to the upstream side of the inflow port A, and the high-pressure side outflow port of the compressor 45 is connected to the condenser 25 and further to the upstream side.

  One end of the second refrigerant pipe 49 is connected to the communication port B, and the other end of the second refrigerant pipe 49 is connected to the communication port C via the dew condensation prevention pipe 24.

  A third refrigerant pipe 50 is connected to the downstream side of the communication port D, and is connected to the low-pressure side suction port of the compressor 45 via the pressure reducing means 28 that is a thin tube and the cooler 7 that is an evaporator.

  First, the first mode of the refrigerant switching valve 27 will be described with reference to FIG.

  In the first mode of the refrigerant switching valve 27, the inlet A and the communication port B of the refrigerant switching valve 27 communicate with each other, and the communication port C and the communication port D communicate with each other.

  After the refrigerant is compressed by the compressor 45, the first refrigerant flow 51 flows into the refrigerant switching valve 27 from the inlet A through the first refrigerant pipe 48 and flows out from the communication port B, and the second refrigerant pipe. The second refrigerant flow 52 flows from the communication port C through 49 and flows out from the communication port D, and returns to the compressor 45 through the third refrigerant pipe 50.

  The high-temperature and high-pressure refrigerant compressed by the compressor 45 is cooled by the condenser 25, then passes through the dew condensation prevention pipe 24, and the opening peripheral portion of the refrigerator main body 1 is heated to lower the refrigerant temperature and further reduce the pressure. After passing through the means 28, it adiabatically expands to a low temperature, and the cooler 7 exchanges heat with air for cooling each storage chamber and returns to the compressor 45.

  Since the refrigerant temperature passing through the dew condensation prevention pipe 24 is higher than the outside air temperature where the refrigerator body 1 is installed, it is possible to prevent condensation on the opening peripheral edge of the refrigerator body 1 even when the outside air is hot and humid.

  The second mode of the refrigerant switching valve 27 will be described with reference to FIG.

  In the second mode of the refrigerant switching valve 27, the communication port B, the communication port C, and the communication port D are closed to block the refrigerant from flowing from the inflow port A into each communication port. Therefore, by setting the second mode while the compressor 45 is stopped, the relatively high-temperature refrigerant in the first refrigerant pipe 48 and the second refrigerant pipe 49 flows into the third refrigerant pipe 50. The temperature rise of the cooler 7 can be prevented by blocking. Here, in the case of the operation of cooling the storage chamber by the refrigeration cycle, the compressor 45 is stopped when the storage chamber is lowered to a predetermined temperature, and the compressor 45 is restarted when the storage chamber is raised to the predetermined temperature. In consideration of the operation of stopping and restarting the compressor 45, in the present embodiment, since the refrigerant in the cooler 7 is maintained at a low temperature when the compressor 45 is stopped, the refrigerant is stored when the compressor 45 is restarted. Since the temperature is low, the heat exchange efficiency is high and the energy saving performance is high.

  On the other hand, as described later, the communication port B and the communication port C communicate with each other, and the second refrigerant pipe 49 forms a closed refrigerant circuit 53 including the dew condensation prevention pipe 24.

  The third mode of the refrigerant switching valve 27 will be described with reference to FIG.

  In the third mode of the refrigerant switching valve 27, the inlet A and the communication port D communicate with each other to form a third refrigerant flow 57, and the communication port B and the communication port C are closed.

  The high-temperature and high-pressure refrigerant compressed by the compressor 45 is cooled by the condenser 25, then flows into the refrigerant switching valve 27 from the inlet A through the first refrigerant pipe 48, and flows out from the communication port D. The refrigerant flowing out from the communication port D passes through the decompression means 28 and then adiabatically expands to become a low temperature. The refrigerant 7 exchanges heat with the air that cools the storage chambers and returns to the compressor 45.

  Here, when the outside air is low in humidity, if a refrigerant having a temperature higher than that of the outside air flows through the condensation prevention pipe 24 in spite of a low risk of condensation, the heat may heat the storage chamber. Therefore, in the present embodiment, a third mode is provided and control is performed so that the refrigerant does not flow through the dew condensation prevention pipe 24. Thereby, although there is no effect of preventing condensation at the peripheral edge of the opening of the refrigerator body 1, when the risk of condensation is low, heat leakage from the condensation prevention pipe 24 to the inside of the refrigerator body 1 can be prevented, and energy saving performance can be improved. .

  The first mode and the third mode of the refrigerant switching valve 27 are provided with an outside air temperature sensor 29 and an outside air humidity sensor 30 for detecting the temperature and humidity of the outside air, and whether or not there is a risk of condensation based on the detection result. If the mode is switched to the first mode when there is a risk of condensation and the third mode is selected when there is no risk of condensation, condensation can be prevented only when necessary. It is effective in suppressing power warming and reducing power consumption.

  Next, the configuration and operation of the refrigerant switching valve 27 will be described with reference to FIGS.

  FIG. 8 is a perspective view showing the appearance of the refrigerant switching valve 27 in the first embodiment of the present invention. 9 is a cross-sectional view taken along line FF in FIG. 10 is a view in the direction of the arrow G in FIG. FIG. 11 is a perspective view showing the internal configuration of the refrigerant switching valve, and is a perspective view in which the stator case 58 and the valve case 59 are virtually removed from the refrigerant switching valve 27 and seen through. As shown in FIGS. 8 to 9, a substantially cylindrical stator 60 that is a stator of a motor provided with a coil is formed inside a substantially cylindrical stator case 58. A part of the stator case 58 forms a connector case 61 that is convex outward, and a connector 63 having connector pins 62 that connect the wiring from the stator 60 to the outside is formed in the connector case 61. Is provided.

  The valve case 59 is integrally formed of a nonmagnetic metal such as stainless steel, and has a bottomed cylindrical shape with the upper end closed and the lower end open. The upper side of the valve case 59 is fitted to the inner periphery of the stator 60, and the lower side of the valve case 59 is an open end whose diameter is larger than that of the upper side. A circular valve seat plate 64 is fitted to the open end, and the entire periphery is hermetically sealed by welding or brazing.

  As shown in FIGS. 9 and 10, the valve seat plate 64 has a disc-shaped first valve seat plate 64 a constituting the outer periphery of the valve seat plate 64 and a diameter larger than that of the first valve seat plate 64 a. The disk-shaped second valve seat plate 64b, which is small and thick and includes the center position of the first valve seat plate 64a, is joined to each other so as to seal the joint portion by brazing.

  One inflow pipe 65 is coupled to the first valve seat plate 64a by brazing so as to seal the joint portion, and the second valve seat plate 64b is connected to three communication pipes 66b, 66b, and communication pipes. 66c and the communication pipe 66d are joined so as to seal the joint portion by brazing and communicate with the inside of the valve case 59.

  As shown in FIG. 10, one end of the inflow pipe 65, the communication pipe 66 b, the communication pipe 66 c, and the communication pipe 66 d has an inlet port A, a communication port B, which opens toward the inside of the valve case 59 on one surface of the valve seat plate 64. The communication port C and the communication port D are connected.

  On the second valve seat plate 64b, at the center position of the first valve seat plate 64a, a fitting hole of a rotor shaft 68 which is a rotation center axis of a rotor 67 provided with a magnet which is a rotor of a motor. And one end of the rotor shaft 68 is coupled to the second valve seat plate 64b by brazing so as to seal the joint. The other end of the rotor shaft 68 is supported by being fitted to a rotor bearing 69 which is a recess provided in the approximate center of the cylindrical bottomed portion above the valve case 59.

  One end of the rotor 67 is supported so as to rotate integrally with the rotor driving unit 70, and a pinion gear 72 is provided on a part of the lower side of the rotor driving unit 70.

  In FIG. 10, three communication pipes 66, that is, a communication pipe 66b, a communication pipe 66c, and a communication pipe 66d, are connected to the center of rotation on the second valve seat plate 64b. Provided adjacent to each other in a semicircle on the first valve seat plate 64a (within a 180 ° fan-shaped range centered on the rotor shaft 68) so as not to straddle, with the valve body shaft 73 as the center Arranged on the same arc. The valve body shaft 73 and the inflow port A are adjacent to each other, and are provided outside the previous semicircle to which the communication pipe 66 is connected. That is, the communication pipe 66b, the communication pipe 66c, and the communication pipe 66d communicate with each other on the valve seat on the opposite side of the rotor shaft 68 from the valve body shaft 73 and on the arc around the valve body shaft 73. Mouth (communication port B, C, D) is provided.

  Inside the valve case 59, a valve body 74 that swings while being in contact with the valve seat plate 64 is provided, and swings about the valve body shaft 73. When the valve body 74 swings, the communication ports B, C, and D provided in the valve seat plate 64 are opened and closed. A communication concave portion 75 that is a concave portion is provided on the surface of the valve body 74 that contacts the valve seat plate 64. The relationship between the position and the opening / closing operation of the communication ports B, C, and D will be described later.

  An internal gear 76 is provided on a part of the valve body 74 on the opposite side of the valve seat plate 64, and meshes with the pinion gear 72 to reduce the rotation of the rotor 67 and transmit the power for swinging the valve body 74. A plate spring 77 for pressing the valve body 74 against the valve seat plate 64 is provided on the upper surface of the valve body 74.

  When the connector pin 62 is connected to a drive circuit (not shown) and energized, a magnetic field is generated in the stator 60, and a magnetic force is transmitted to the rotor 67 via the valve case 59 to constitute a motor that rotates the rotor 67. An example of the configuration of such a motor is a general stepping motor, and detailed description thereof is omitted, but the motor rotates at a constant angle.

  As shown in FIG. 11, a substantially disc-shaped leaf spring 77 is disposed on the upper surface of the valve body 74, and a part of the leaf spring 77 is bent toward the valve body 74 so that the first presser portion 77a and the second presser foot. The valve element 74 is pressed against the valve seat plate 64 as the portion 77b.

  Next, the opening / closing operation of the communication ports B, C, D by the valve body 74 will be described with reference to FIGS. 12 to 14 are views showing the internal configuration of the refrigerant switching valve according to the first embodiment of the present invention, and are perspective views showing the leaf spring 77 in a non-display state.

  12 shows a first state in which the valve body 74 covers the communication port D and the communication port C connected to the end of the communication pipe and opened in the valve seat plate 64, and the communication port B is opened in the valve case 59. It is.

  FIG. 13 shows a second state in which the communication port B, the communication port C, and the communication port D are all covered by the valve body 74.

  FIG. 14 shows a third state in which the communication port B and the communication port C are covered by the valve body 74, and the communication port D is opened inside the valve case 59.

  The valve body 74 reversibly moves from the first state shown in FIGS. 12 to 14 to the third state through the second state, and then returns to the first state through the second state. .

  The configuration of the valve body 74 and the rotor drive unit 70 that drives the valve body will be described with reference to FIGS. 15 and 16.

  FIG. 15 is an exploded perspective view showing the configuration of the valve body 74 and the rotor drive unit 70 of the refrigerant switching valve in the first embodiment of the present invention. FIG. 16 is a perspective view showing the configuration of the valve body of the refrigerant switching valve in the first embodiment of the present invention, and is a view of the valve body as viewed from the back side in FIG.

  The valve body 74 has a generally fan shape centered on a valve body shaft hole 78 that supports the valve body shaft 73, and includes an internal gear 76 provided concentrically with the valve body shaft hole 78, an internal gear 76, and a valve An arc-shaped elongated hole 80 concentric with the valve body shaft hole 78 is provided between the body shaft hole 78.

  Three protrusions (a first protrusion 79a, a second protrusion 79b, and a third protrusion 79c) are provided on the opposite side of the valve body shaft hole 78 across the internal gear 76 of the valve body 74. The first protrusions 79a, the second protrusions 79b, and the third protrusions 79c are provided in a radial manner with the valve body shaft hole 78 as a center, and are provided at equal intervals with an angle α. A detailed description of the value of the angle α and the action of these protrusions will be given later.

  A rotor shaft 68 is rotatably fitted in the rotor drive shaft hole 81 of the rotor drive unit 70. Further, a groove 82 is provided on the rotor 67 side of the rotor drive unit 70 so as to be continuous with the rotor drive shaft hole 81, and a protrusion (not shown) provided on the rotor 67 is fitted with the groove 82 and rotates integrally. Thus, torque is transmitted.

  The rotor drive unit tip 83 is disposed through the long hole 80 of the valve body 74, and the pinion gear 72 meshes with the internal gear 76. When the rotor driving unit 70 is rotated, the pinion gear 72 swings the valve body 74 around the valve body shaft hole 78 via the internal gear 76, and the first state shown in FIG. 12 and the first state shown in FIG. The second state and the third state shown in FIG. 14 are reversibly movable.

  In FIG. 16, the opposite side of the valve body shaft hole 78 across the elongated hole 80 of the valve body 74 forms a valve body sliding contact surface 84 that contacts the valve seat plate 64, and the valve body sliding contact surface 84 is the valve body shaft. An arcuate shape having an arcuate outer periphery 86 and an inner periphery 85 centered on the hole 78 is formed.

  A part of the valve body sliding contact surface 84 is provided with a communication recess 75 that is coaxial with the valve body shaft hole 78 and provided between the outer periphery 86 and the inner periphery 85 and does not pass therethrough.

  Next, the positional relationship among the valve body 74, the valve body sliding contact surface 84, the inflow pipe 65, and the communication pipes 66b, 66c, and 66d will be described with reference to FIG. FIG. 17 is a cross-sectional view taken along the line H-H in FIG. 12 showing the configuration of the refrigerant switching valve according to the first embodiment of the present invention. The valve body 74 shows a third state in which the valve body 74 swings counterclockwise.

  The pinion gear 72 and the internal gear 76 mesh with each other, and when the pinion gear 72 provided rotatably around the rotor shaft 68 provided at the center of the cylindrical valve case 59 rotates, the valve body 74 is decelerated and the valve body 74 swings. Move. The reduction ratio between the pinion gear 72 and the internal gear 76 is the ratio of the pitch circle radius R1 of the pinion gear 72 centered on the rotor shaft 68 to the pitch circle radius R2 of the internal gear 76 centered on the valve body shaft hole 78 (R1). / R2), which is about 1/5 in this embodiment.

  The rotor drive section tip 83 (see FIG. 15) passes through a long hole 80 provided in the valve body 74, and is in contact with the illustrated left end of the long hole 80 in FIG. That is, even if the pinion gear 72 is rotated counterclockwise from the illustrated state, the valve element 74 does not rotate further counterclockwise. In this way, the rotor driving portion tip 83 and the inner peripheral edge of the long hole 80 are in contact with each other, thereby serving as a stopper that regulates the swing range of the valve body 74.

  On the other hand, when the pinion gear 72 is rotated clockwise from the state of FIG. 17, the valve body 74 swings until the rotor drive unit tip 83 and the illustrated right end of the long hole 80 abut. Since the rotor drive unit tip 83 and the inner peripheral edge of the long hole 80 are in contact with each other to serve as a stopper, the swing angle of the valve body 74 is limited.

  In this manner, the rotor drive unit tip 83 and the inner periphery of the long hole 80 function as a stopper for the swing angle of the valve body 74 without providing a special stopper member.

  The inflow pipe 65 is provided in the vicinity of the valve body shaft 73, and is always closed inside the valve case 59 without being closed even when the valve body 74 swings. The communication pipe 66 c is on a straight line J connecting the valve body shaft 73 and the rotor shaft 68, and is provided on the opposite side of the rotor shaft 68 from the valve body shaft 73.

  The communication pipe 66b and the communication pipe 66d are disposed on an arc passing through the communication pipe 66c with the valve body shaft 73 as a center, and are provided at positions of an angle α with the valve body shaft 73 as a center.

  The valve body sliding contact surface 84 provided on the valve body 74 is provided with a dimension capable of simultaneously covering all of the communication pipe 66b, the communication pipe 66c, and the communication pipe 66d. That is, if the maximum width dimension of the communication pipe 66b and the communication pipe 66d is W1, and the width dimension of the valve body sliding contact surface 84 is W2, W2> W1. Further, the respective maximum width dimensions that circumscribe the communication pipe 66b and the communication pipe 66c, and the communication pipe 66c and the communication pipe 66d are set to a width W3 that is substantially equal to the width of the communication recess 75 provided in the valve body 74. That is, the communication recessed part 75 is the structure which covers the communication pipe 66b and the communication pipe 66c which adjoin, or the communication pipe 66c and the communication pipe 66d in the range which mutually connects. FIG. 17 illustrates a state in which the communication pipe 66 c and the communication pipe 66 d are communicated via the communication recess 75.

  Next, the open / close state of the inflow pipe 65, the communication pipe 66b, the communication pipe 66c, and the communication pipe 66d and the flow of the refrigerant will be described with reference to FIGS.

18A, FIG. 19A, and FIG. 20A are bottom views as seen from the direction of arrow G in FIG. 8, and are explanatory views respectively showing the first state to the third state of the refrigerant switching valve in the first embodiment of the present invention. It is. In addition, the valve body sliding contact surface 84 provided in the valve body 74 is hatched and illustrated. 18B, 19B, and 20B are a K ₁ -K ₁ sectional view of FIG. 18A, a K ₂ -K ₂ sectional view of FIG. 19A, and a K ₃ -K ₃ sectional view of FIG. 20A, respectively. In addition, it is connected with the refrigerant circuit diagrams shown in FIGS. 5 to 7 and is a schematic block diagram.
First, the first state will be described with reference to FIGS. 18A and 18B. 18A and 18B, as in FIG. 12, the valve body 74 covers the communication port C and the communication port D, and the communication port B opens inside the valve case 59.

  The high-temperature and high-pressure refrigerant compressed by the compressor 45 is cooled by the condenser 25 and then flows into the valve case 59 from the inlet pipe 65 and the inlet A. The refrigerant that has flowed into the valve case 59 flows out of the communication port B and the communication tube 66b and flows into the dew condensation prevention pipe 24 that is the second refrigerant tube, and then enters the valve body 74 from the communication tube 66c and the communication port C. It flows into the communication recess 75 provided. The refrigerant that has flowed into the communication recess 75 flows out of the communication port D and the communication pipe 66d, is adiabatically expanded by the pressure reducing means 28, becomes a low temperature and a low pressure, and is sucked from the low pressure side of the compressor 45. This refrigerant flow constitutes a dew condensation prevention circuit which is the first state similar to that in FIG.

  Next, the second state will be described with reference to FIGS. 19A and 19B. 19A and 19B show a second state in which the communication port B, the communication port C, and the communication port D are all covered with the valve body 74 as in FIG. 13, and the valve body 74 is shown in the counterclockwise state from the first state. This is a positional relationship that is swung in the direction by an angle α.

  In this state, only the inflow port A communicates with the inside of the valve case 59, and the communication port B and the communication port C communicate with the communication recess 75 of the valve body 74. That is, both ends of the dew condensation prevention pipe 24 are in communication with each other. This state is a second state similar to FIG. 6, and prevents the refrigerant from moving between the condenser 25, the compressor 45, the cooler 7, and the decompression means 28, and therefore when the compressor 45 is stopped. This state is preferable.

  Next, the third state will be described with reference to FIGS. 20A and 19B. 20A and 20B are the third state in which the communication port B and the communication port C are covered with the valve body 74, and the communication port D is opened inside the valve case 59, as in FIGS. This is a positional relationship in which the valve element 74 is further swung in the counterclockwise direction by an angle α from the state.

  In this third state, the high-temperature and high-pressure refrigerant compressed by the compressor 45 is cooled by the condenser 25 and then flows into the valve case 59 from the inlet pipe 65 and the inlet A, and the communication port D, It flows out of the communication pipe 66d. Thereafter, the refrigerant that has been adiabatically expanded by the decompression means 28 to become low temperature and low pressure is sucked from the low pressure side of the compressor 45 through the cooler 7. Since the communication pipe 66b and the communication pipe 66c do not communicate with each other, the refrigerant in the dew condensation prevention pipe 24 remains in the pipe. The refrigerant circuit at this time is in a third state similar to that in FIG. 7 and constitutes a bypass circuit in which the refrigerant does not pass through the dew condensation prevention pipe 24.

  As described with reference to FIGS. 18A to 20B, the valve body 74 is switched from the first state to the third state through the second state by using the refrigerant switching valve 27 that is the four-way valve of the present embodiment. Can do. That is, it is possible to switch between the dew condensation prevention circuit that is the first mode shown in FIGS. 5 to 7, the compressor stop state that is the second mode, and the bypass circuit that is the third mode. Of course, the above-mentioned swinging operation is reversible and switching from the third mode to the first mode via the second mode, or the first mode and the second mode, the second mode and the first mode. It is possible to switch between the three modes.

  Next, the relationship between the leaf spring 77 and the valve body 74 will be described with reference to FIGS. 18A to 20B and FIG.

  As described above, the valve body 74 has the first protrusion 79a, the second protrusion 79b, and the third protrusion 79c on the upper surface of the outer periphery of the internal gear 76, with the valve body shaft hole 78 as the center. They are provided radially for each angle α. This angle α is equal to the angle between the communication port B and the communication port C and between the communication port C and the communication port D when the valve body shaft hole 78 is centered, as described in FIG.

  As described with reference to FIG. 11, the leaf spring 77 provided on the upper portion of the valve body 74 has a first presser portion 77 a and a second presser portion 77 b on the valve body 74 so as to press the valve body 74. It is provided extending in the direction of proximity. In the first state shown in FIG. 18B, the second pressing portion 77b is deformed in contact with the second protrusion 79b, and applies a pressing force P2 to the second protrusion 79b. Thereby, the valve body sliding contact surface 84 of the valve body 74 is pressed against the valve seat plate 64 and brought into close contact with each other, thereby preventing refrigerant leakage.

  In the second state shown in FIG. 19B, the valve body 74 is in a position swung by an angle α from the state of FIG. 18B, and the first pressing portion 77a comes into contact with the first protrusion 79a of the valve body 74. Thus, the pressing force P1 is applied, and the second pressing portion 77b is in contact with the third protrusion 79c of the valve body 74 to apply the pressing force P1. Thereby, the valve body sliding contact surface 84 of the valve body 74 is pressed against the valve seat plate 64 and brought into close contact with each other, thereby preventing refrigerant leakage.

  In the third state shown in FIG. 20B, the valve body 74 is further swung by an angle α from the state of FIG. 19B, and the first pressing portion 77a of the leaf spring 77 is in the second state of the valve body 74. The contact is deformed in contact with the protrusion 79b, and a pressing force P2 is applied to the second protrusion 79b. Thereby, the valve body sliding contact surface 84 of the valve body 74 is pressed against the valve seat plate 64 and brought into close contact with each other, thereby preventing refrigerant leakage.

  Here, in the first state shown in FIG. 18B and the third state shown in FIG. 20B, one presser portion (first presser portion 77 a or second presser portion 77 b) of the leaf spring 77 is provided. A pressing force is applied to the second protrusion 79b at the center of the valve body 74. On the other hand, in the second state shown in FIG. 19B, both the first pressing portion 77a and the second pressing portion 77b of the leaf spring 77 are connected to the first protrusion 79a and the third protrusion of the valve body 74. A pressing force is applied to each of the two positions 79c. Therefore, the amount of protrusion of the second protrusion 79b is larger than that of the first protrusion 79a and the third protrusion 79c of the valve body 74. As a result, the pressing force P2 that the valve element 74 receives from the pressing portion of the leaf spring 77 in the first state and the third state can be brought close to 2 × P1, which is the total pressing force in the second state. Even in the first state or the third state, a sufficient pressing force against the valve seat plate 64 of the valve body sliding contact surface 84 of the valve body 74 can be obtained to ensure the closing performance.

  In the refrigerant switching valve in the present embodiment, the valve element 74 is pressed against the valve seat plate 64 in the first state shown in FIG. 18A, the second state shown in FIG. 19A, and FIG. 20A. It is in the case of the 3rd state shown. That is, when the valve body 74 is swinging and moving between these states, the first presser portion 77a and the second presser portion 77b of the leaf spring 77 are provided with any protrusion of the valve body 74. Neither of them comes into contact, so that the drive torque can be reduced.

  Further, since the high pressure from the compressor 45 is applied to the inlet A via the first refrigerant pipe 48 and communicates with the inside of the valve case 59, the valve body 74 is always attached to the valve body 74. A force in the pressing direction is applied to the plate 64. Therefore, the close contact performance between the valve body sliding contact surface 84 and the valve seat plate 64 is improved, and the leakage of the refrigerant can be reduced.

  According to the present embodiment, a valve body, valve body driving means for driving the valve body, a case containing the valve body, a valve seat provided at one end of the case, and the inside of the case of the valve seat An inflow pipe 65 having one end opened and connected thereto, a first communication pipe (communication pipe 66b), a second communication pipe (communication pipe 66c), and a third communication pipe (communication pipe 66b). The valve body communicates the inflow pipe and the first communication pipe, and communicates the second communication pipe and the third communication pipe, and the first communication pipe. And the second communication pipe, the second state in which the third communication pipe is closed, the inflow pipe and the third communication pipe, the first communication pipe and the second communication pipe It is characterized by switching between the third state in which the second communication pipe is closed. Thereby, a refrigerant switching valve with improved refrigerant switching performance can be provided.

  In addition, in a device including a refrigerant circuit in which a compressor, a condenser, a decompression unit, and a cooler are sequentially connected by a refrigerant pipe, a dew condensation prevention pipe disposed at a peripheral edge of the front opening of the device main body, and the refrigerant A refrigerant switching valve for switching flow is provided downstream of the condenser and upstream of the pressure reducing means, and the refrigerant switching valve passes the refrigerant from the condenser to the pressure reducing means after passing through the condensation prevention pipe. A first mode for circulation (FIG. 5), a second mode (FIG. 6) for blocking refrigerant from flowing through the refrigerant circuit, and the decompression means from the condenser without passing through the dew condensation prevention pipe. The mode of the three refrigerant circuits of the third mode (FIG. 7) in which the refrigerant is circulated can be switched by the operation of the only refrigerant switching valve. In addition, the refrigeration cycle can be configured without the need for additional valves with the only refrigerant switching valve, and it is inexpensive and the switching control and arrangement of the valves are not complicated. Reliability can be improved.

  The valve body is swingably supported around the valve body axis, the stator provided on the outer periphery of the case, the rotor provided on the inner periphery of the case and rotating by energizing the stator, and the rotor A rotor shaft that is rotatably supported, on the valve seat, opposite to the valve body shaft with respect to the rotor shaft, and on the arc around the valve body axis The communication ports of the second communication tube, the second communication tube, and the third communication tube are provided. Thereby, the opening / closing precision of each communicating port by a valve body can be improved.

  Also, depending on the measurement result of the outside air humidity sensor, if the outside air is hot and humid and there is a risk of condensation, let the high temperature refrigerant pass through the condensation prevention piping, and if the outside air is low humidity and there is no risk of condensation. Can switch the refrigerant circuit so that the refrigerant does not pass through the dew condensation prevention pipe by only the switching operation of the refrigerant switching valve. Therefore, dew condensation can be prevented by setting the temperature of the opening front peripheral edge of the storage room higher than the storage room temperature. Moreover, it can suppress that the heat from dew condensation prevention piping leaks into the storage chamber inside, and energy consumption increases.

  A first state in which an inlet A, a communication port B, a communication port C, and a communication port D are provided; the inlet A and the communication port B are connected; and the communication port C and the communication port D are connected. The communication port B and the communication port C are connected, the communication port D is closed, the second state is closed, the inlet A and the communication port D are connected, and the communication port B and the communication port C are closed. Switch between and. Thereby, the switching performance of a refrigerant | coolant can be improved. In addition, the refrigerant can be switched in accordance with the actual use state of the device provided with the refrigerant switching valve.

  Also, an internal gear that meshes with a pinion that rotates integrally with the rotary rotor is provided in a part of the valve body, and the internal gear is provided on the side opposite to the swing support shaft with respect to the axis of the rotary rotor to reduce the speed. . As a result, the ratio between the pitch circle radius of the pinion gear and the pitch circle radius of the internal gear can be increased, so the torque transmitted to the valve body can be sufficiently increased by increasing the reduction ratio, and the valve body can be swung. Is stable.

  In addition, the tip of the pinion gear concentric with the rotor shaft passes through a curved long hole provided in the valve body, and both ends of the long hole are at the top dead center and the bottom dead center where the valve body swings. And the tip of the pinion gear come into contact with each other to regulate the swing. That is, the valve body is provided with an arc-shaped long hole through which one end of the rotor passes, and when the valve body is in the first state, one end of the long hole and one end of the rotor are in contact with each other and swings to one side. The angle is limited, and when the valve body is in the third state, the other end of the long hole and one end of the rotor are in contact with each other to limit the swing angle to the other. This eliminates the need for additional parts for special angle stoppers and simplifies the configuration.

  In addition, three protrusions are provided on the opposite side of the valve body from the valve seat, and one or two of the protrusions are in the first state, the second state, and the third state of the valve body. In this state, the valve body is pressed against the valve seat by applying a pressing load in contact with the tip of the leaf spring. That is, a leaf spring that presses the valve body toward the valve seat is provided on the opposite side of the valve body with respect to the valve seat, and the leaf spring includes a first presser portion and a second presser that press the valve seat. The valve body abuts against at least one of the first presser part and the second presser part in the first state, the second state, and the third state. And having a protrusion pressed toward the valve seat, thereby ensuring the closing of the valve. Further, when the valve body moves between the first state, the second state, and the third state of the valve body, the leaf spring does not come into contact with the projection, so that the friction load during sliding It is possible to improve the reliability by reducing the wear as well as reducing the wear.

<Second Embodiment>
A second embodiment of the refrigerant switching valve according to the present invention will be described with reference to FIG. FIG. 21 is an explanatory diagram showing the configuration and operation of the refrigerant switching valve in the second embodiment of the present invention. (1), (2), and (3) in FIG. 21 are bottom views similar to FIGS. 18A, 19A, and 20A, respectively, and are shown by hatching the valve body sliding contact surface 84 provided on the valve body 74. Show.

  18A, FIG. 19A, and FIG. 20A are different from the embodiment shown in FIG. Is a point. In FIG. 21 (1), the communication port B is open and the communication port D is closed. In FIG. 21 (2), both the communication port B and the communication port D are closed. In FIG. 21 (3), the communication port B is closed and the communication port D is open. If each of these states is expressed in the form of “communication port B / communication port D”, the open / close state becomes three states of “open / closed, closed / closed, closed / open”.

  According to this embodiment, it can be made to function as a three-way valve with the same configuration as the refrigerant switching valve described in the first embodiment, and the refrigerant flow and shutoff can be switched quickly. To reliability in suppressing refrigerant leakage in each of the third states.

<Third embodiment>
Furthermore, 3rd embodiment of the refrigerant | coolant switching valve by this invention is described using FIG. FIG. 22 is an explanatory diagram showing the configuration and operation of the refrigerant switching valve according to the third embodiment of the present invention. (1), (2), and (3) in FIG. 22 are the same bottom views as FIGS. 18A, 19A, and 20A, and the valve body sliding contact surface 84 provided on the valve body 74 is hatched. ing.

  18A, FIG. 19A, and FIG. 20A are different from the embodiment shown in FIGS. 18A, 19A, and 20A in that the area of the valve-sliding contact surface 84 is large enough to block the two communication ports B and D that are adjacent to each other. Is not formed. The valve seat plate 64 is a so-called three-way valve provided with only the communication port C and the communication port D without forming the communication port B. In FIG. 22 (1), the communication port C and the communication port D are both closed. In FIG. 22 (2), the communication port C is closed and the communication port D is open. In FIG. 22 (3), the communication port C and the communication port D are both open. When these states are expressed in the form of “communication port C / communication port D”, the open / close state is “closed / closed”. , “Closed / opened, open / opened”.

  According to this embodiment, it can be made to function as a three-way valve with the same configuration as the refrigerant switching valve described in the first embodiment, and the refrigerant flow and shutoff can be switched quickly. To reliability in suppressing refrigerant leakage in each of the third states.

<Fourth embodiment>
Furthermore, 4th embodiment of the refrigerant | coolant switching valve by this invention is described using FIG. FIG. 23 is an explanatory diagram showing the configuration and operation of the refrigerant switching valve according to the fourth embodiment of the present invention. (1), (2), (3), and (4) in FIG. 23 are bottom views similar to FIGS. 18A, 19A, and 20A, and the valve body sliding contact surface 84 provided on the valve body 74 is hatched. Are shown.

  18A, FIG. 19A, and FIG. 20A are different from the embodiment shown in FIGS. 18A, 19A, and 20A in that the area of the valve-sliding contact surface 84 is large enough to block the two communication ports B and D that are adjacent to each other. Is not formed. Furthermore, the swing angle of the valve body 74 is expanded (angle 3 × α), and the shape of the valve body 74 and the long hole 80 are expanded.

  In FIG. 23 (1), the valve body swings counterclockwise by an angle of 1.5α, and both the communication port C and the communication port D are in an open state. In FIG. 23 (2), the valve body is swung clockwise from the state (1) by the angle α, the communication port C is closed, and the communication port D is open. In FIG. 23 (3), the angle α is swung clockwise from the state (2), and both the communication port C and the communication port D are closed. In FIG. 23 (4), the angle α is swung clockwise from the state (3), and the communication port C is open and the communication port D is closed. If each of these states is expressed in the form of “communication port C / communication port D”, the open / close states are four states of “open / open, closed / open, closed / closed, open / closed”.

  According to this embodiment, it can be made to function as a three-way valve with the same configuration as the refrigerant switching valve described in the first embodiment, and the refrigerant flow and shutoff can be switched quickly. To reliability in suppressing refrigerant leakage in each of the third states.

<Fifth embodiment>
Furthermore, 5th embodiment of the refrigerant | coolant switching valve by this invention is described using FIG. FIG. 24 is an explanatory diagram showing the configuration and operation of the refrigerant switching valve according to the fifth embodiment of the present invention. 24 (1) and 24 (2) are bottom views similar to FIGS. 18A, 19A, and 20A, and the valve body sliding contact surface 84 provided on the valve body 74 is hatched.

  18A, FIG. 19A, and FIG. 20A differ from the embodiment shown in FIG. 18A in that the dimensions of the valve body 74 and the long hole 80 are reduced so that the swing angle of the valve body 74 is limited to the aforementioned angle α. This is a so-called two-way valve having only the communication port D.

  In FIG. 24 (1), the valve body 74 is swung counterclockwise by an angle 0.5α, and the communication port D is in an open state. In FIG. 24 (2), the valve element 74 is swung clockwise by the angle α from the state (1), and the communication port D is closed.

  According to this embodiment, it can be made to function as a two-way valve with the same configuration as the refrigerant switching valve described in the first embodiment, and can be quickly switched between refrigerant circulation and shut-off. The reliability which suppresses the refrigerant | coolant leakage in a state can be improved.

<Sixth embodiment>
Furthermore, 6th embodiment of the refrigerant | coolant switching valve by this invention is described using FIGS. 25-26. FIG. 25A is an explanatory diagram showing the configuration of the refrigerant switching valve according to the sixth embodiment of the present invention. FIG. 25B is a K ₄ -K ₄ sectional view of FIG. 25A showing the operation of the refrigerant switching valve in the sixth embodiment of the present invention. FIG. 26A is an explanatory diagram showing the configuration and operation of the refrigerant switching valve according to the sixth embodiment of the present invention. FIG. 26B is a K ₅ -K ₅ cross-sectional view of FIG. 26A showing the operation of the refrigerant switching valve in the sixth embodiment of the present invention.

  In the present embodiment, a schematic configuration of a switching valve that reverses the flow direction of the refrigerant between the indoor unit and the outdoor unit according to heating and cooling in the air conditioner and an outline of the refrigerant circuit diagram at that time are shown.

  As shown in FIGS. 25B and 26B, the high-pressure side discharge port of the compressor 45 is connected to the inflow port A, and the low-pressure side suction pipe is connected to the communication port C, thereby forming the first refrigerant circuit 92. To do.

  The communication port B is connected to one end of the heat exchanger 88 of the outdoor unit, and the other end of the heat exchanger 88 is connected to one end of the heat exchanger 87 of the indoor unit via the decompression means 28 to exchange heat. The other end of the vessel 87 is connected to the communication port D to constitute a second refrigerant circuit 93.

  18A, FIG. 19A, and FIG. 20A differ from the embodiment shown in FIGS. 18A, 19A, and 20A in that the dimensions of the valve body 74 and the elongated hole 80 are reduced so that the swing angle of the valve body 74 is limited to the aforementioned angle α, and 75, and the valve seat plate 64 is a so-called four-way valve in which three communication ports, a communication port B, a communication port C, and a communication port D, are provided.

  As shown in FIG. 25A, the valve body 74 is swung counterclockwise at an angle of 0.5α around the valve body shaft hole 78, and the communication port D communicates with the inside of the valve case 59, the communication port B and the communication port. C is in a state of communicating with each other via a communication recess 75. In this state, as shown in FIG. 25B, the high-temperature and high-pressure refrigerant discharged from the high-pressure side discharge port of the compressor 45 enters the valve case 59 of the refrigerant switching valve 27 from the inlet A, and passes through the communication port D to the indoor unit. Through the heat exchanger 87, the temperature of the heat exchanger 87 of the indoor unit is increased to heat the room. The refrigerant adiabatically expands and cools by the decompression means 28, absorbs heat from the outside air by the heat exchanger 88 of the outdoor unit, and then communicates with the communication port C through the communication port B and the communication port C through the communication port B. Return to the low pressure suction side.

  Next, as shown in FIG. 26A, the valve body 74 is swung clockwise by an angle α from the state of FIG. 26A, the communication port B communicates with the inside of the valve case 59, and the communication port C and the communication port D communicate with each other. It is assumed that they are in communication with each other through the recess 75. In this state, as shown in FIG. 26B, the high-temperature and high-pressure refrigerant discharged from the high-pressure side discharge port of the compressor 45 enters the valve case 59 of the refrigerant switching valve 27 from the inlet A, and the outdoor unit from the communication port B. After the heat is radiated to the outside air through the heat exchanger 88 and the refrigerant is cooled, it is cooled by adiabatic expansion by the decompression means 28, and the heat exchanger 87 of the indoor unit is cooled to absorb the heat in the room and cool it. . Thereafter, the communication pipe D is communicated with the communication pipe C through the communication recess 75 and returned to the low pressure suction side of the compressor 45.

  As described above, in the present embodiment, the air conditioner can be switched between cooling and heating by swinging the valve element 74.

<Seventh embodiment>
Further, a seventh embodiment of the refrigerant switching valve according to the present invention will be described with reference to FIGS. FIG. 27 is a cross-sectional view showing the configuration of the refrigerant switching valve in the seventh embodiment of the present invention. FIG. 28 is an exploded perspective view showing the internal configuration of the refrigerant switching valve according to the seventh embodiment of the present invention.

  In FIG. 27, the same reference numerals as those in FIG. 9 denote the same configuration and the same operational effects, and thus the description thereof is omitted. The difference from FIG. 9 is the configuration of the valve seat plate 90. That is, the first valve seat plate 90a thicker than the second valve seat plate 90b is circular, and the outer periphery thereof is smaller than the inner periphery of the valve case 59, so that the first valve seat plate 90a and the second valve seat The plate 90b is laminated so that the first valve seat plate 90a is on the valve case 59 side, and is joined so as to seal the gap by brazing.

  In the first valve seat plate 90a and the second valve seat plate 90b, holes that pass through the inflow pipe 65, the communication pipe 66b, the communication pipe 66c, and the communication pipe 66d are opened, and the holes communicate with the inflow pipe 65. The pipe B, the communication pipe C, and the communication pipe D are brazed and joined.

  Further, a valve body shaft hole 78 that is a through hole of the valve body shaft 73 is opened on the first valve seat plate 90a, and the valve body shaft 73 is brazed to be joined so as to seal the gap. A rotor shaft hole 89 having a diameter slightly larger than the diameter of the rotor shaft 68 is opened at the center position of the first valve seat plate 64a, and the rotor shaft 68 is fitted and attached.

  Here, by setting the diameter of the first valve seat plate 64 a to an outer peripheral dimension slightly smaller than the inner periphery of the valve case 59, when the valve case 59 is fitted to the valve seat plate 64, the valve seat plate 64 As a result, concentricity between the valve case 59 and the rotor shaft 68 is ensured, and the dimensional accuracy is improved.

  In this embodiment, the rotor shaft 68 and the rotor shaft hole 89 are not brazed but are assembled with a slight gap, and the rotor shaft 68 has one end on the first valve seat plate 90a and the other end on the valve. It fits into a rotor bearing 69 which is a recess provided in the case 59. As a result, the rotor shaft 68 is assembled while maintaining the concentricity with respect to the substantially cylindrical valve case 59. As a result, the concentricity between the rotor 67 and the stator 60 is improved and transmitted from the stator 60 to the rotor 67. The effect is that a stable motor with less torque fluctuation and variation is formed.

DESCRIPTION OF SYMBOLS 1 Refrigerator body 2 Refrigerated room 3 Ice making room 4 Upper freezer room 5 Lower freezer room 6 Vegetable room 7 Cooler 9 Blower in a warehouse (blower, fan)
12 Insulating partition wall 20 Refrigerated temperature zone cold air control means (twin damper)
21 Refrigeration temperature zone cold air control means (single damper)
22 Door packing 23 Front face of refrigerator main body 24 Condensation prevention piping 25 Condenser 26 Outside fan 27 Refrigerant switching valve 28 Pressure reducing means (capillary)
29 Outside air temperature sensor 30 Outside air humidity sensor 31 Control board 45 Compressor 46 Defrost heater (defrost means)
48 First refrigerant pipe 49 Second refrigerant pipe 50 Third refrigerant pipe 51 First refrigerant flow 52 Second refrigerant flow 53 Refrigerant circuit 57 Third refrigerant flow 58 Stator case 59 Valve case (case)
60 Stator (Valve Drive Unit)
61 Connector case 62 Connector pin 63 Connector 64 Valve seat plate (valve seat)
64a, 90a First valve seat plate 64b, 90b Second valve seat plate 65 Inflow pipe 66 Communication pipe 66b Communication pipe (first communication pipe)
66c Communication pipe (second communication pipe)
66d Communication pipe (third communication pipe)
67 Rotor (valve drive means)
68 Rotor shaft 69 Rotor bearing 70 Rotor drive portion 72 Pinion gear 73 Valve body shaft 74 Valve body 75 Communication recess 76 Internal gear 77 Leaf spring 77a First presser portion 77b Second presser portion 78 Valve body shaft hole 79a First protrusion 79b Second projection 79c Third projection 80 Long hole 81 Rotor drive shaft hole 82 Groove 83 Rotor drive tip 84 Valve body sliding contact surface 85 Inner periphery 86 Outer periphery 87, 88 Heat exchanger 89, 91 Rotor shaft hole 90 Valve Seat plate 92 First refrigerant circuit 93 Second refrigerant circuit

Claims (5)

The disc,
Valve body driving means for driving the valve body;
A case containing the valve body;
A valve seat provided at one end of the case;
An inflow pipe connected to the inside of the case of the valve seat by opening one end, a first communication pipe, a second communication pipe, and a third communication pipe;
The valve body is
A first state in which the inflow pipe communicates with the first communication pipe, and the second communication pipe communicates with the third communication pipe;
A second state in which the first communication pipe communicates with the second communication pipe, and the third communication pipe is closed;
A refrigerant switching valve, wherein the inflow pipe and the third communication pipe are connected to each other and the first communication pipe and the third state in which the second communication pipe is closed are switched. The valve body is swingably supported around the valve body axis,
A stator provided on the outer periphery of the case;
A rotor provided on the inner periphery of the case and rotating by energizing the stator;
A rotor shaft that rotatably supports the rotor,
On the valve seat, the first communication pipe, the second communication pipe, and the first communication pipe are on a side opposite to the valve body axis with respect to the rotor shaft and on an arc around the valve body axis. The refrigerant switching valve according to claim 1, wherein communication ports of the three communication pipes are provided. The valve body is provided with an arc-shaped elongated hole through which one end of the rotor passes,
When the valve body is in the first state, one end of the elongated hole and one end of the rotor are in contact with each other to limit the swing angle to one side,
2. The refrigerant switching valve according to claim 1, wherein when the valve body is in the third state, the other end of the elongated hole and one end of the rotor are in contact with each other to limit the swing angle to the other. A leaf spring that presses the valve body toward the valve seat is provided on the opposite side of the valve body with respect to the valve seat,
The leaf spring has a first presser part and a second presser part that press the valve seat,
In the first state, the second state, and the third state, the valve body abuts against at least one of the first presser part and the second presser part and faces the valve seat. The refrigerant switching valve according to any one of claims 1 to 3, further comprising a protrusion that is pressed. In a device having a refrigerant circuit in which a compressor, a condenser, a decompression means, and a cooler are sequentially connected by a refrigerant pipe,
Condensation prevention piping disposed on the peripheral edge of the front opening of the device body;
A refrigerant switching valve for switching the flow of the refrigerant is provided downstream of the condenser and upstream of the pressure reducing means;
The refrigerant switching valve is
A first mode in which the refrigerant flows from the condenser to the decompression means via the dew condensation prevention pipe;
A second mode in which the refrigerant circuit is cut off so that no refrigerant flows;
A third mode in which the refrigerant flows from the condenser to the pressure reducing means without going through the dew condensation prevention pipe;
A device characterized by switching.