JP5991277B2 - Integrated valve for heat pump - Google Patents

Description

  The present invention relates to a heat pump integrated valve applied to a heat pump cycle that can be switched to a gas injection cycle.

  Conventionally, as an air conditioner applied to a vehicle that is difficult to secure a heat source for heating a vehicle interior such as an electric vehicle, a high-temperature and high-pressure refrigerant discharged from a compressor of a heat pump cycle (vapor compression refrigeration cycle) is used. Some heat sources heat the passenger compartment.

  As this type of heat pump cycle, the refrigerant is decompressed in two stages between the radiator and the evaporator, and a gas injection cycle in which a part of the intermediate pressure refrigerant (gas phase refrigerant) is merged with the refrigerant in the compression process in the compressor ( An economizer refrigeration cycle is known.

  For example, Patent Document 1 discloses a heat pump cycle that switches from a normal cycle (one-stage compression cycle) to a gas injection cycle (two-stage compression cycle) during heating operation in order to improve the coefficient of performance (COP) of the cycle during heating operation. It is disclosed.

  Specifically, in the heat pump cycle of Patent Document 1, the first and second decompression means for decompressing the refrigerant flowing out from the radiator, and the gas-liquid separation for separating the gas-liquid of the intermediate pressure refrigerant decompressed by the first decompression means. And an evaporator for evaporating the refrigerant.

  And, by providing an on-off valve for opening and closing the refrigerant passage in the intermediate pressure refrigerant passage for guiding the gas-phase refrigerant separated by the gas-liquid separator to the intermediate pressure port of the compressor, a gas injection cycle and a gas injection cycle It is configured to switch between other normal cycles.

  Here, when the heat pump cycle is caused to function as a normal cycle, the second decompression means is set to a fully open state that does not exhibit a decompression action. On the other hand, when the heat pump cycle is made to function as a gas injection cycle, both the first and second decompression means are set to a throttle state that exerts a decompression action in order to decompress the refrigerant flowing out of the radiator in two stages. The

  Therefore, in Patent Document 1, the open / close valve that opens and closes the intermediate pressure refrigerant passage is configured as a differential pressure valve that opens the intermediate pressure refrigerant passage when the front-rear differential pressure of the second pressure reducing means becomes equal to or greater than a predetermined differential pressure. . This simplifies the cycle configuration of the heat pump cycle.

  Patent Document 2 discloses an example in which a compressor is configured as a scroll compressor in a heat pump cycle functioning as a gas injection cycle. Specifically, in Patent Document 2, an intermediate pressure port is formed in an end plate portion of a fixed scroll, and the intermediate pressure port is periodically opened and closed by a tooth tip that contacts the end plate portion of the fixed scroll in the movable scroll. Thus, the intermediate pressure refrigerant is combined with the refrigerant in the compression process.

JP 2012-181005 A JP 09-105386 A

By the way, if the compressor of patent document 2 is applied with respect to the heat pump cycle which can switch a gas injection cycle and a normal cycle like patent document 1, it is the following with the refrigerant | coolant filling operation | work which fills a refrigerant | coolant in a cycle. It was found that this problem occurred.
(1) The intermediate pressure refrigerant passage may not be evacuated in the evacuation step. (2) The intermediate pressure refrigerant passage may not be filled in the filling step. As a result of intensive studies on (1) and (2), the cause of each defect (1) and (2) was clarified. This will be described below.

  FIG. 21 is a schematic diagram showing a configuration in which the scroll compressor disclosed in Patent Document 2 is applied to a heat pump cycle capable of switching between a gas injection cycle and a normal cycle (hereinafter referred to as a study example).

  First, each component of the study example will be briefly described. The heat pump cycle 100 of the examination example includes an intermediate pressure port 101c that compresses the refrigerant sucked from the suction port 101a and discharges it from the discharge port 101b, and flows the intermediate pressure refrigerant in the cycle into the refrigerant in the compression process. A scroll type compressor 101 is provided.

  Similar to Patent Document 2, the compressor 101 is configured to periodically open and close the intermediate pressure port 101c by the tooth tip of the movable scroll 101e that contacts the end plate portion of the fixed scroll 101d. The compressor 101 is provided with a check valve 101f that prevents the refrigerant from flowing backward from the intermediate pressure port 101c to the intermediate pressure refrigerant passage 111 described later.

  On the discharge port 101b side of the compressor 101, a radiator 102, a first pressure reducing means 103, and a gas-liquid separator 104 are connected in order from the upstream side. On the gas-liquid separator 104 exit side of the liquid-phase refrigerant, there are provided a fixed throttle 105a that functions as the second decompression means 105, and an on-off valve 105b that bypasses the fixed throttle 105a and flows the refrigerant. ing.

  Further, on the outlet side of the second decompression means 105, an outdoor heat exchanger 106 that exchanges heat between the refrigerant and the outside air, a third decompression means 107 that decompresses the refrigerant flowing out of the outdoor heat exchanger 106, an evaporator 108, and an evaporator An accumulator 109 that separates the gas-liquid refrigerant flowing out of 108 is connected. On the outlet side of the outdoor heat exchanger 106, an on-off valve 110a for opening and closing a bypass passage 110 that bypasses the third decompression means 107 and the evaporator 108 and flows the refrigerant to the accumulator 109 is provided.

  Further, the gas-liquid separator 104 is connected to an intermediate pressure refrigerant passage 111 that guides the separated gas-phase refrigerant to the intermediate pressure port 101 c of the compressor 101. The intermediate-pressure refrigerant passage 111 is provided with a differential pressure valve 112 that opens the intermediate-pressure refrigerant passage 111 when the differential pressure across the fixed throttle 105a exceeds a predetermined pressure.

  Specifically, as shown in FIG. 22, the differential pressure valve 112 includes a valve body 112 a that opens and closes the intermediate pressure refrigerant passage 111, a spring 112 b that applies a load to the valve body 112 a toward the side where the intermediate pressure refrigerant passage 111 is closed, and the like. Has been.

  Returning to FIG. 21, the heat pump cycle 100 is provided with a first filling port 113 for filling the refrigerant into the high-pressure refrigerant passage in the cycle and a second filling port 114 for filling the refrigerant into the low-pressure refrigerant passage in the cycle. . The first filling port 113 also functions as a port for performing evacuation.

  The above is description of the heat pump cycle 100, and the cause of the above-described problem (1) will be described below. In the heat pump cycle 100, evacuation is performed via the first filling port 113 in a state where the function valves such as the on-off valves 105b and 110a are set to a fully opened state.

  In this evacuation step, it is possible to perform evacuation for portions other than the intermediate pressure refrigerant passage 111, but it becomes impossible to evacuate the intermediate pressure refrigerant passage 111 in the following cases. .

  That is, as shown in the compressor 101 of FIG. 21, when the intermediate pressure port 101c is closed by the tooth tip of the movable scroll 101e inside the compressor 101, the vacuum from the intermediate pressure port 101c side of the compressor 101 is closed. The pull cannot be carried out.

  On the other hand, evacuation from the differential pressure valve 112 side is also conceivable. However, when evacuating, the pressure before and after the fixed throttle 105a becomes almost zero, the intermediate pressure refrigerant passage 111 is not opened by the urging force of the spring 112b, and evacuation via the differential pressure valve 112 cannot be performed.

  In this way, in the heat pump cycle 100 of FIG. 21, if the intermediate pressure port 101c is closed inside the compressor 101 in the evacuation step of the refrigerant filling operation, the intermediate pressure refrigerant passage 111 cannot be evacuated. . The problem (1) occurs not only in the scroll compressor 101 but also in a compressor in which the intermediate pressure port 101c may be closed inside.

  Next, the cause of the problem (2) will be described. After the evacuation process of the heat pump cycle 100 is completed, a specified amount of refrigerant is filled through at least one of the filling ports 113 and 114.

  In this filling step, the differential pressure valve 112 does not open, and the refrigerant may not be sealed in the refrigerant passage from the differential pressure valve 112 to the check valve 101 f of the compressor 101 in the intermediate pressure refrigerant passage 111.

  This point will be described with reference to FIG. As shown in FIG. 21, a force F23 due to a pressure difference before and after the fixed throttle 105a acts on the valve body 112a of the differential pressure valve 112 in the valve opening direction. Further, a force F21 caused by a pressure difference between the intermediate pressure port 101c side of the intermediate pressure refrigerant passage 111 and the upstream side of the fixed throttle 105a and a biasing force Fsp of the spring 112b act on the valve body 112a in the valve closing direction.

And the valve opening force F of the differential pressure valve 112 can be prescribed | regulated with the following numerical formula, valve opening is carried out on the conditions used as valve opening force F> 0, and the heat pump cycle 100 switches to a gas injection cycle.
F = F23−F21−Fsp
F = A2 * (P2-P3) -A1 * (P2-P1) -Fsp
“P1” is the pressure on the intermediate pressure port 101c side of the intermediate pressure refrigerant passage 111, “P2” is the pressure on the upstream side of the fixed throttle 105a, and “P3” is the pressure on the downstream side of the fixed throttle 105a. Further, “A1” is the area of the part where the pressures P1 and P2 act on the valve body 112a, and “A2” is the area of the part where the pressures P2 and P3 act on the valve body 112a.

  However, when the intermediate pressure refrigerant passage 111 is in a vacuum state (P1≈0) in the evacuation step, F21 acting on the valve body 112a of the differential pressure valve 112 in the valve closing direction increases, and is generated by the cycle operation. In such a differential pressure, the differential pressure valve 112 may not open. In other words, according to the configuration of the examination example, the pressure acting on the valve body 112a of the differential pressure valve 112 in the valve opening direction decreases due to the pressure drop in the intermediate pressure refrigerant passage, so that the differential pressure valve 112 becomes inoperable. Sometimes.

  Moreover, if it is going to implement | achieve the heat pump cycle 100 shown in the examination example, a cycle structure will be easy to become complicated. Such complication of the cycle configuration is not preferable because it causes a deterioration in mountability on an object to be mounted (for example, a vehicle) as the entire heat pump cycle.

  In view of the above points, the present invention is capable of eliminating various problems associated with refrigerant filling operations in a heat pump cycle that can be switched to a gas injection cycle, and for improving the mounting property on a mounting object. The purpose is to provide an integrated valve.

  The present invention is directed to a heat pump integrated valve applied to a heat pump cycle that can be switched to a gas injection cycle.

In order to achieve the above object, according to the first aspect of the present invention, the refrigerant inlet (141a) for allowing the refrigerant discharged from the compressor (11) to flow in, and the gas for separating the gas and liquid from the refrigerant flowing in from the refrigerant inlet. A liquid separation space (141b), a liquid phase side outlet (141e) for letting out the liquid phase refrigerant separated in the gas liquid separation space, and a gas phase side flow for letting out the gas phase refrigerant separated in the gas liquid separation space. A body (140) formed with an outlet (142a);
A liquid-phase side valve body (181) that opens and closes a liquid-phase refrigerant passage (141d) from the gas-liquid separation space to the liquid-phase side outlet,
A main drive mechanism (182) for displacing the liquid-phase side valve element to an open position for opening the liquid-phase refrigerant passage and a closed position for closing the liquid-phase refrigerant passage;
A fixed throttle (17) for depressurizing the liquid-phase refrigerant and flowing it out to the liquid-phase side outlet when the main drive mechanism displaces the liquid-phase side valve element to the closed position of the liquid-phase refrigerant passage;
An opening and closing mechanism (16) configured to include a main valve body (161) that opens and closes a gas-phase refrigerant passage from the gas-liquid separation space to the gas-phase side outlet,
Of the upstream-side passage (142h) and the liquid-phase refrigerant passage constituting the refrigerant passage on the gas-liquid separation space side in the gas-phase refrigerant passage when the gas-phase refrigerant passage is closed, one refrigerant passage and the gas-phase refrigerant passage are Bypass valve bodies (181d, 183) that open and close bypass bypass passages (144 to 146) that communicate with a downstream passage (142g) that constitutes a refrigerant passage on the gas phase side outlet side in the gas phase refrigerant passage when closed. 184), and
The gas phase side outlet is connected to an intermediate pressure refrigerant passage (15) that leads to an intermediate pressure port (11d) that merges with the refrigerant in the compression process in the compressor,
The body is formed with a back pressure chamber (142e) into which the pressure of the liquid phase side outlet is introduced,
The main valve body is configured to open and close the gas phase refrigerant passage by a pressure balance of the pressure of the upstream passage, the pressure of the downstream passage, and the pressure of the back pressure chamber,
The bypass valve element is configured to open the bypass communication path when the main drive mechanism displaces the liquid phase side valve element to the closed position of the liquid phase refrigerant path.

  According to this, even when the intermediate pressure port of the compressor is closed when evacuation is performed, the liquid phase side valve element is displaced to the closed position of the liquid phase refrigerant passage, and the bypass communication passage is opened. In addition, the downstream side passage and the intermediate pressure refrigerant passage can be evacuated via the bypass communication passage.

  Further, even if the pressure in the downstream side passage of the gas phase refrigerant passage becomes vacuum due to the evacuation of the refrigerant filling operation, the liquid phase side valve element is displaced to the closed position of the liquid phase refrigerant passage and the bypass communication passage is opened. Thus, the refrigerant can be charged into the downstream side passage and the intermediate pressure refrigerant passage via the bypass communication passage.

  In addition, the equipment necessary for switching to the gas injection cycle such as gas-liquid separation space, fixed throttle, liquid phase side valve element, and opening / closing mechanism is housed in the body and integrated, so the cycle configuration of the heat pump cycle It can be simplified.

  Therefore, according to the present invention, it is possible to eliminate various problems associated with the refrigerant filling operation in the heat pump cycle that can be switched to the gas injection cycle, and to improve the mountability of the heat pump cycle on the mounting object.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

It is a whole block diagram which shows the refrigerant circuit at the time of the cooling operation mode of the heat pump cycle which concerns on 1st Embodiment, and the dehumidification heating operation mode. It is a whole lineblock diagram showing the refrigerant circuit at the time of the 1st heating mode of the heat pump cycle concerning a 1st embodiment. It is a whole lineblock diagram showing the refrigerant circuit at the time of the 2nd heating mode of the heat pump cycle concerning a 1st embodiment. It is an up-down direction sectional view at the time of closure of a gaseous-phase refrigerant passage of an integrated valve concerning a 1st embodiment. It is an up-down direction sectional view at the time of opening of a gaseous-phase refrigerant passage of an integrated valve concerning a 1st embodiment. It is an up-down direction sectional view at the time of opening of a bypass communicating passage of an integrated valve concerning a 1st embodiment. It is sectional drawing for demonstrating the structure of the opening / closing mechanism which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the cooling operation mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 1st heating mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 2nd heating mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 1st dehumidification heating mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 2nd dehumidification heating mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 3rd dehumidification heating mode of the heat pump cycle which concerns on 1st Embodiment. It is a Mollier diagram for demonstrating the 4th dehumidification heating mode of the heat pump cycle which concerns on 1st Embodiment. It is an up-down direction sectional view at the time of closure of a gaseous-phase refrigerant passage of an integrated valve concerning a 2nd embodiment. It is an up-down direction sectional view at the time of opening of a gaseous-phase refrigerant passage of an integrated valve concerning a 2nd embodiment. It is an up-down direction sectional view at the time of opening of a bypass communicating passage of an integrated valve concerning a 2nd embodiment. It is an up-down direction sectional view at the time of closure of a gaseous-phase refrigerant passage of an integrated valve concerning a 3rd embodiment. It is an up-down direction sectional view at the time of opening of a gaseous-phase refrigerant passage of an integrated valve concerning a 3rd embodiment. It is an up-down direction sectional view at the time of opening of a bypass communicating passage of an integrated valve concerning a 3rd embodiment. It is a schematic diagram which shows the heat pump cycle which concerns on an examination example. It is explanatory drawing for demonstrating the opening / closing operation | movement of the differential pressure valve which concerns on the examination example.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
The first embodiment will be described. In this embodiment, a heat pump cycle 10 including the heat pump integrated valve 14 (hereinafter simply referred to as an integrated valve 14) of the present invention is driven from a traveling electric motor to a vehicle traveling drive. The present invention is applied to a vehicle air conditioner 1 for an electric vehicle that obtains power.

  In the vehicle air conditioner 1, the heat pump cycle 10 functions to cool or heat the indoor blown air using the indoor blown air blown into the vehicle interior that is the air conditioned space as the heat exchange target fluid.

  The heat pump cycle 10 of the present embodiment includes a refrigerant circuit (FIG. 1) in a cooling operation mode for cooling the passenger compartment and heating while dehumidifying the passenger compartment (FIG. 1), and a refrigerant circuit in a heating operation mode for heating the passenger compartment. (FIGS. 2 and 3) can be switched.

  In the heat pump cycle 10 of the present embodiment, the refrigerant circuit in the first heating mode executed when the outside air temperature is extremely low (for example, 0 ° C. or less) as the heating operation mode as will be described later (FIG. 2). The refrigerant circuit (FIG. 3) in the second heating mode in which normal heating is performed can be switched.

  In the present embodiment, the refrigerant circuit in the first heating mode shown in FIG. 2 constitutes a gas injection cycle (two-stage compression cycle), and the refrigerant circuit in the cooling operation mode and the dehumidifying heating mode and the refrigerant circuit in the second heating mode are normal. Cycle (single-stage compression cycle).

  Therefore, the heat pump cycle 10 of the present embodiment is configured as a cycle that can be switched to a gas injection cycle (two-stage compression cycle) and a normal cycle (one-stage compression cycle) other than the gas injection cycle. In addition, the whole block diagram of FIG. 1 has shown the refrigerant circuit at the time of switching to air_conditionaing | cooling operation mode and dehumidification heating operation mode, and the refrigerant circuit at the time of the whole block diagram of FIG. 2, FIG. 3 switching to heating operation mode Is shown. Moreover, in FIGS. 1-3, the flow of the refrigerant | coolant in each operation mode is shown by the solid line arrow.

The heat pump cycle 10 employs an HFC-based refrigerant (for example, R134a) as the refrigerant, and constitutes a vapor compression subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the refrigerant critical pressure. Of course, HFO-based refrigerant (e.g., R1234yf) may be employed and carbon dioxide CO ₂ and the like. The refrigerant is mixed with refrigerating machine oil for lubricating the compressor 11, and a part of the refrigerating machine oil circulates in the cycle together with the refrigerant.

  Among the components of the heat pump cycle 10, the compressor 11 is disposed in the hood of the vehicle, and sucks, compresses and discharges the refrigerant in the heat pump cycle 10. The compressor 11 is configured by an electric compressor configured to house a compression mechanism that compresses the refrigerant in the compression chamber 11a and an electric motor that rotationally drives the compression mechanism inside a housing that forms the outer shell. .

  The housing of the compressor 11 includes a suction port 11b for sucking low-pressure refrigerant into the compression chamber 11a, a discharge port 11c for discharging high-pressure refrigerant from the compression chamber 11a, a medium pressure refrigerant in the cycle to the compression chamber 11a, and a compression process An intermediate pressure port 11d for joining the refrigerant is provided.

  In the compressor 11 of the present embodiment, the compression mechanism periodically changes the communication state between the intermediate pressure port 11d and the compression chamber 11a so that the intermediate pressure refrigerant in the cycle is appropriately injected into the compression chamber 11a. It is configured to close.

  Specifically, as the compression mechanism of the compressor 11, for example, a scroll type compression mechanism similar to that of the prior art (Patent Document 2) can be employed. In this case, the intermediate pressure port 11d provided on the end plate portion of the fixed scroll is periodically closed by the tooth tip of the movable scroll (not shown). Note that the compression mechanism of the compressor 11 is not limited to the scroll compression mechanism as long as the communication state between the intermediate pressure port 11d and the compression chamber 11a is temporarily blocked, and the vane compression mechanism. Various types such as a rolling piston type compression mechanism can be adopted.

  Further, the compressor 11 allows the refrigerant to flow into the compression chamber 11a from the later-described intermediate pressure refrigerant passage 15 side connected to the intermediate pressure port 11d, and the refrigerant from the compression chamber 11a to the intermediate pressure refrigerant passage 15 side. The check valve 11e for prohibiting the inflow of is incorporated. Thus, when the refrigerant pressure in the compression chamber 11a becomes higher than the refrigerant pressure in the intermediate pressure refrigerant passage 15 (the refrigerant pressure on the intermediate pressure port 11d side), the intermediate pressure refrigerant from the compression chamber 11a through the intermediate pressure port 11d. It is possible to prevent the refrigerant from flowing back to the passage 15 side.

  The operation (rotation speed) of the electric motor is controlled by a control signal output from the air conditioning control device 40 described later, and either an AC motor or a DC motor may be adopted. And the refrigerant | coolant discharge capability of the compressor 11 is changed by this rotation speed control. Therefore, in this embodiment, the electric motor constitutes the discharge capacity changing means of the compressor 11.

  The refrigerant inlet side of the indoor condenser 12 is connected to the discharge port 11 c of the compressor 11. The indoor condenser 12 is disposed in an air conditioning case 31 of an indoor air conditioning unit 30 to be described later, radiates high-pressure refrigerant discharged from the compressor 11, and heats indoor blown air that has passed through an indoor evaporator 23 to be described later. It is a radiator.

  The refrigerant outlet side of the indoor condenser 12 is connected to the inlet side of the high stage expansion valve 13 that can depressurize the high-pressure refrigerant flowing out of the indoor condenser 12 until it becomes an intermediate-pressure refrigerant. The high-stage expansion valve 13 is an electric type that includes a valve body that can change the throttle opening degree and an electric actuator that includes a stepping motor that changes the throttle opening degree of the valve body. This is a variable aperture mechanism.

  The high stage side expansion valve 13 is configured to be able to be set to a throttling state that exhibits a pressure reducing action and a fully open state that does not exhibit a pressure reducing action. In other words, the high stage side expansion valve 13 of the present embodiment is configured to be able to be set to a throttled state in which the refrigerant flowing out from the indoor condenser 12 is decompressed at least until it becomes an intermediate pressure refrigerant.

  Specifically, the high-stage expansion valve 13 is configured to change the throttle opening in a range where the throttle passage area has an equivalent diameter of φ0.5 to φ3 mm when the refrigerant is decompressed. Further, when the throttle opening is fully opened, the high stage side expansion valve 13 can secure a throttle passage area of an equivalent diameter of about 10 mm so as not to exert the refrigerant decompression action. The operation of the high stage side expansion valve 13 is controlled by a control signal output from the air conditioning control device 40.

  The refrigerant inlet side of the integrated valve 14 is connected to the outlet side of the high stage side expansion valve 13. This integrated valve 14 is an integral part of the components required to make the heat pump cycle 10 function as a gas injection cycle, and serves as refrigerant circuit switching means for switching the refrigerant circuit of the refrigerant circulating in the cycle. Fulfills the function.

  Specifically, the integrated valve 14 includes a gas-liquid separation unit (gas-liquid separation space 141b) that separates the gas-liquid of the refrigerant, and a decompression unit (fixed throttle 17 and the like) that decompresses the liquid-phase refrigerant separated by the gas-liquid separation unit. ), And an opening / closing mechanism 16 for opening and closing the refrigerant passage of the gas-phase refrigerant separated by the gas-liquid separation means. The opening / closing mechanism 16 functions as an intermediate pressure on / off valve that opens and closes the intermediate pressure refrigerant passage 15.

  Details of the integrated valve 14 will be described with reference to FIGS. 4 to 6 are schematic vertical sectional views of the integrated valve 14. In addition, the up and down arrows in FIGS. 4 to 6 indicate the up and down directions in a state where the integrated valve 14 is mounted on the vehicle air conditioner 1. The same applies to the following embodiments.

  The integrated valve 14 has a body 140 that forms an outer shell thereof and accommodates the opening / closing mechanism 16 and the like therein. The body 140 is configured by a substantially rectangular tube-shaped metal block body (for example, aluminum) whose axial direction extends in the vertical direction. The body 140 according to the present embodiment includes a lower block 141 disposed on the lower side and an upper block 142 attached and fixed to the upper side of the lower block 141.

  In the lower block 141, a gas-liquid separation space 141b for separating the gas-liquid refrigerant flowing out from the high stage side expansion valve 13 is formed. The gas-liquid separation space 141b is formed in a columnar shape whose axial direction extends in the vertical direction.

  Further, the lower block 141 is formed with a refrigerant inlet 141a through which the refrigerant from the high-stage expansion valve 13 flows into the outer wall surface. The refrigerant inflow port 141a communicates with the gas-liquid separation space 141b through a refrigerant introduction hole 141g opened in the inner wall surface of the gas-liquid separation space 141b.

  Here, the refrigerant introduction passage 141h constituting the refrigerant passage from the refrigerant inlet 141a to the refrigerant introduction hole 141g is tangential to the inner wall surface of the gas-liquid separation space 141b when viewed from the axial direction of the gas-liquid separation space 141b. It is formed to extend.

  Thereby, the refrigerant that has flowed into the gas-liquid separation space 141b from the refrigerant inlet 141a swirls along the inner wall surface of the gas-liquid separation space 141b. And the gas-liquid of the refrigerant | coolant which flowed into the gas-liquid separation space 141b is isolate | separated by the centrifugal force which arises by this turning flow, and the isolate | separated liquid phase refrigerant | coolant falls to the downward side of the gas-liquid separation space 141b by gravity. In addition, the gas-liquid separation space 141b of the present embodiment constitutes a centrifugal-type gas-liquid separation means.

  On the lower side of the gas-liquid separation space 141b of the lower block 141, there is formed a liquid phase side outflow hole 141c through which the separated liquid phase refrigerant flows out to the liquid phase refrigerant passage 141d side. The liquid-phase refrigerant passage 141d is formed below the gas-liquid separation space 141b and guides the refrigerant that has flowed out of the gas-liquid separation space 141b to the liquid-phase side outlet 141e that allows the refrigerant to flow out of the integrated valve 14. It is a passage.

  More specifically, the liquid-phase refrigerant passage 141d includes a first elongated hole extending perpendicular to the axial direction of the gas-liquid separation space 141b and a second elongated hole extending in the axial direction of the gas-liquid separation space 141b. It is composed of through-holes that are combined in a letter shape. In addition, the opening part opened to the outer side in the 2nd long hole which comprises the liquid phase refrigerant path 141d comprises the liquid phase side outflow port 141e.

  The first elongated hole of the liquid phase refrigerant passage 141d has a liquid phase side valve body 181 that opens and closes the liquid phase refrigerant passage 141d, and a spring that applies a load to the liquid phase side valve body 181 in the direction of closing the liquid phase refrigerant passage 141d. 181a and the like are accommodated.

  The spring 181a presses the resinous annular sealing member 181b disposed at the tip of the liquid phase side valve body 181 against the valve seat portion 141f formed in the liquid phase refrigerant passage 141d against the liquid phase side valve body 181. The load is applied in the direction to improve the sealing performance. In addition, the valve seat part 141f is comprised by the cyclic | annular protrusion part suitable for the sealing member 181b.

  The liquid phase side valve body 181 is connected to a movable member of a solenoid actuator 182 (hereinafter simply referred to as a solenoid 182) via a shaft 181c. The shaft 181c constitutes a transmission member that transmits the force generated by the solenoid 182 to the liquid phase side valve body 181.

  The solenoid 182 is a driving mechanism that displaces the liquid-phase side valve body 181 by moving the movable member by generating an electromagnetic force by power supply from the outside, and is controlled by a control voltage output from the air conditioning control device 40 described later. The operation is controlled.

  In the present embodiment, when the air-conditioning control device 40 supplies power to the solenoid 182, a load on the side that opens the liquid phase refrigerant passage 141 d is applied to the liquid phase side valve body 181 via the shaft 181 c due to electromagnetic force acting on the movable member. It has become. And when the load by electromagnetic force exceeds the load by the spring 181a, as shown in FIG. 4, the liquid phase side valve body 181 will be displaced to the position spaced apart from the valve seat part 141f. Thereby, the liquid phase refrigerant passage 141d is opened.

  When power supply to the solenoid 182 is stopped, electromagnetic force does not act on the movable member, and the load on the spring 181a causes the liquid-phase side valve element 181 to move to the valve seat portion 141f as shown in FIGS. Displaces to the position where it contacts. Thereby, the liquid phase refrigerant passage 141d is closed.

  The configuration for opening and closing the liquid phase refrigerant passage 141d such as the liquid phase side valve body 181 and the solenoid 182 of the present embodiment constitutes a normally closed type electromagnetic valve 18. Further, the solenoid 182 of the present embodiment constitutes a main drive mechanism that displaces the liquid phase side valve body 181 to an open position that opens the liquid phase refrigerant passage 141d and a closed position that closes the liquid phase refrigerant passage 141d. The solenoid 182 also functions as a closing member that closes the opening of the first elongated hole that constitutes the liquid-phase refrigerant passage 141d.

  In addition, a cylindrical body 143 that slidably supports the shaft 181c is disposed in a position adjacent to the solenoid 182 in the first elongated hole that constitutes a part of the liquid-phase refrigerant passage 141d. The tubular body 143 has a communication space 144c that forms a part of a bypass communication path 144 described later.

  In addition, a spherical bypass valve body 183 that opens and closes the bypass communication path 144 is connected to the shaft 181c at a portion located in the communication space 144c inside the cylindrical body 143. The bypass communication path 144 will be described later.

  The bypass valve body 183 of the present embodiment closes the bypass communication path 144 when the liquid-phase refrigerant passage 141d is opened by the liquid-phase side valve body 181 and opens the liquid-phase refrigerant passage 141d by the liquid-phase side valve body 181. When this is done, the bypass communication path 144 is opened.

  As shown in FIG. 4, the bypass valve body 183 is a bypass valve formed in the communication space 144 c inside the cylindrical body 143 when the liquid phase refrigerant passage 141 d is opened by the liquid phase side valve body 181. It is displaced to a position where it abuts against the seat 143a. Thereby, the bypass communication path 144 is closed.

  Further, as shown in FIGS. 5 and 6, the bypass valve body 183 is formed from the bypass valve seat 143 a inside the cylindrical body 143 when the liquid phase refrigerant passage 141 d is closed by the liquid phase side valve body 181. It is displaced to a position to be separated. Thereby, the bypass communication path 144 is opened.

  As described above, the bypass valve body 183 of the present embodiment has a force that acts on the liquid phase side valve body 181 when the solenoid 182 displaces the liquid phase side valve body 181 to the closed position of the liquid phase refrigerant passage 141d. The bypass communication path 144 is configured to open.

  Here, in the lower block 141, when the liquid-phase side valve element 181 closes the liquid-phase refrigerant passage 141d, the refrigerant flowing in from the gas-liquid separation space 141b is decompressed and flows out to the liquid-phase side outlet 141e side. A fixed diaphragm 17 is formed.

  The pressure loss that occurs when the refrigerant passes through the liquid phase refrigerant passage 141d with the liquid phase side valve body 181 opening the liquid phase refrigerant passage 141d is relative to the pressure loss that occurs when the refrigerant passes through the fixed throttle 17. And very small.

  For this reason, in a state where the liquid-phase side valve body 181 opens the liquid-phase refrigerant passage 141d, the refrigerant is not decompressed by the fixed restrictor 17, but via the refrigerant passage formed on the inner peripheral side of the valve seat portion 141f. And flows out from the liquid-phase side outlet 141e.

  On the other hand, in a state where the liquid phase side valve body 181 closes the liquid phase refrigerant passage 141d, the refrigerant is decompressed by the fixed throttle 17, and the refrigerant decompressed by the fixed throttle 17 flows out from the liquid phase side outlet 141e.

  The integrated valve 14 of the present embodiment includes a throttled state in which the liquid-phase refrigerant separated in the gas-liquid separation space 141b is decompressed by opening and closing the liquid-phase refrigerant passage 141d by the liquid-phase side valve body 181, and the gas-liquid separation space 141b. The refrigerant that has passed through can be switched to a fully open state in which the pressure is not reduced. In the present embodiment, the fixed throttle 17 and the electromagnetic valve 18 in the integrated valve 14 constitute a decompression unit that can decompress the liquid-phase refrigerant separated by the gas-liquid separation unit.

  Here, as the fixed throttle 17, a nozzle, an orifice, or the like having a fixed throttle opening can be employed. In fixed throttles such as nozzles and orifices, the throttle passage area suddenly shrinks or expands rapidly, so that the flow rate of refrigerant passing through the fixed throttle as the pressure difference between the upstream side and downstream side (differential pressure between the inlet and outlet) changes. And the dryness of the fixed throttle upstream refrigerant can be self-adjusted (balanced).

  Specifically, when the pressure difference is relatively large, a balance is made so that the dryness of the fixed throttle upstream side refrigerant increases as the necessary circulating refrigerant flow rate required to circulate the cycle decreases. On the other hand, when the pressure difference is relatively small, it is balanced so that the dryness of the fixed throttle upstream side refrigerant decreases as the required circulating refrigerant flow rate increases.

  Next, the upper block 142 will be described. The upper block 142 constitutes a body that accommodates various components (the main valve body 161, the main elastic member 162, etc.) constituting the opening / closing mechanism 16.

  The upper block 142 of the present embodiment is formed with a gas-phase side outlet 142a for allowing the gas-phase refrigerant to flow out to the intermediate pressure port 11d side of the compressor 11 on the outer wall surface. Although not shown, an intermediate pressure refrigerant passage 15 that leads to the intermediate pressure port 11d is connected to the gas phase side outlet 142a.

  The upper block 142 has a gas-phase refrigerant passage 142b through which the gas-phase refrigerant separated in the gas-liquid separation space 141b flows. The gas-phase refrigerant passage 142b is a refrigerant passage that guides the gas-phase refrigerant flowing from a refrigerant inflow portion 142d described later to the gas-phase side outlet 142a.

  When the upper block 142 is integrated with the lower block 141, a round tubular pipe portion 142c disposed coaxially with the gas-liquid separation space 141b is provided. Note that the refrigerant flowing into the gas-liquid separation space 141b swirls around the pipe portion 142c and flows.

  The pipe portion 142c extends so that the lowermost lower end portion is positioned inside the gas-liquid separation space 141b, and the gas phase refrigerant separated in the gas-liquid separation space 141b is supplied to the lower end portion. A refrigerant inflow portion 142d is formed to flow into the gas-phase refrigerant passage 142b.

  The gas-phase refrigerant passage 142b of the present embodiment is configured by a space inside the pipe portion 142c and a part of a through hole extending perpendicularly to the axial direction of the gas-liquid separation space 141b in the upper block 142. One opening of the through hole constitutes a gas phase side outlet 142a.

  The through-hole is formed with a main valve seat portion 142f to which one end portion of a main valve body 161, which will be described later, contacts and is separated. The main valve seat 142f of the present embodiment is formed integrally with the upper block 142, and is constituted by an annular (doughnut-shaped) protrusion that protrudes toward the main valve body 161 side.

  Various parts (main valve body 161, main elastic member 162) constituting the opening / closing mechanism 16 are accommodated in the through holes formed in the upper block 142. In the present embodiment, the gas-liquid separation space 141b side refrigerant passage in the gas-phase refrigerant passage 142 when the opening / closing mechanism 16 closes the gas-phase refrigerant passage 142b is defined as the upstream-side passage 142h, and the gas-phase side in the gas-phase refrigerant passage 142b. The refrigerant passage on the outlet 142a side is defined as a downstream passage 142g. Since the downstream side passage 142 g communicates with the intermediate pressure refrigerant passage 15, the pressure of the downstream side passage 142 g is equal to the pressure of the intermediate pressure refrigerant passage 15.

  The opening / closing mechanism 16 includes a main valve body 161 and a main elastic member 162, and displaces the main valve body 161 by the pressure balance of the pressure of the upstream passage 142h, the pressure of the downstream passage 142g, and the pressure of the back pressure chamber 142e described later. It consists of a differential pressure type valve mechanism.

  The main valve body 161 of the opening / closing mechanism 16 is displaced between a position where one end portion where the seal member 161d is provided contacts the main valve seat portion 142f and a position away from the main valve seat portion 142f. It is a member that opens and closes the phase refrigerant passage 142b.

  In the main valve body 161 of the present embodiment, one end that contacts and separates from the main valve seat 142f receives the pressure of the downstream passage 142g in the direction to open the gas-phase refrigerant passage 142b, and closes the gas-phase refrigerant passage 142b. It is configured to receive the pressure of the upstream side passage 142h.

  That is, the main valve body 161 has a pressure receiving surface that receives the pressure of the downstream passage 142g in the direction of opening the gas-phase refrigerant passage 142b at one end that is in contact with and away from the main valve seat portion 142f. It has a pressure receiving surface that receives the pressure of the upstream side passage 142h in the closing direction. The end surface exposed to the downstream passage 142g in the main valve body 161 constitutes a pressure receiving surface that receives the pressure of the downstream passage 142g, and the end surface exposed to the upstream passage 142h receives the pressure of the upstream passage 142h. Make up surface.

  Further, the main valve body 161 has a body portion 161a at the other end portion on the opposite side of the one end portion contacting and separating from the main valve seat portion 142f. The body portion 161a divides a through hole formed in the upper block 142 into a space on the gas phase refrigerant passage 142b side and a space forming a back pressure chamber 142e into which the pressure of the liquid phase side outlet 142e is introduced. It is a member to do. The body portion 161a is formed in a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the through hole, and is slidably supported on the inner wall surface of the through hole.

  The body portion 161a is configured to receive the pressure of the back pressure chamber 142e in the direction to close the gas-phase refrigerant passage 142b and to receive the pressure of the upstream-side passage 142h in the direction to open the gas-phase refrigerant passage 142b. That is, the body portion 161a has a pressure receiving surface that receives the pressure of the back pressure chamber 142e in the direction of closing the gas-phase refrigerant passage 142b, and a pressure-receiving surface that receives the pressure of the upstream side passage 142h in the direction of opening the gas-phase refrigerant passage 142b. Have. The end surface exposed to the upstream side passage 142h in the body portion 161a constitutes a pressure receiving surface that receives the pressure of the upstream side passage 142h, and the end surface exposed to the back pressure chamber 142e receives the pressure of the back pressure chamber 142e. Is configured.

  Here, the back pressure chamber 142e restricts the displacement of the main valve body 161 and the main elastic member 162 configured by a coil spring or the like that applies a load to the main valve body 161 in the direction of opening the gas-phase refrigerant passage 142b. A regulating member 163 is disposed.

  The regulating member 163 is a bottomed cylindrical member having an outer diameter that matches the inner diameter of the through hole formed in the upper block 142, and is formed on the upper block 142 and a stopper that regulates the displacement of the main valve body 161. It functions as a closing member for closing the through hole.

  Further, the back pressure chamber 142e of this embodiment is connected to a pressure introduction passage 19 that communicates with a refrigerant passage downstream of the refrigerant flow of the fixed throttle 17, and the refrigerant flow of the fixed throttle 17 through the pressure introduction passage 19 is connected. Downstream pressure (pressure at the liquid phase side outlet 142e) is introduced.

  Here, the bypass communication path 144 of the present embodiment will be described. The bypass communication path 144 of the present embodiment includes a first communication hole 144a that communicates with the upstream path 142h, a second communication hole 144b that communicates with the downstream path 142g, and a communication space 144c within the cylindrical body 143 described above. It is comprised by.

  The first communication hole 144a is connected to each block 141, so that the space on the bypass valve body 183 side with respect to the bypass valve seat 143a in the communication space 144c inside the tubular body 143 communicates with the upstream side passage 142h. 142 and the tubular body 143.

  Further, the second communication hole 144b is connected to the blocks 141 and 142 so that the space on the solenoid 182 side and the downstream passage 142g with respect to the bypass valve seat 143a in the communication space 144c inside the cylindrical body 143 communicate with each other. Further, it is formed across the cylindrical body 143.

  Then, the valve opening conditions of the opening / closing mechanism 16 of this embodiment are demonstrated. As shown in FIG. 7, at one end of the main valve body 161 of the present embodiment, a force [A1 × due to a pressure difference [P2−P1] between the pressure P2 of the upstream passage 142h and the pressure P1 of the downstream passage 142g. (P2-P1)] acts in the valve closing direction of the main valve body 161. “A1” is an area of the pressure receiving surface that receives the pressure P2 of the upstream passage 142h and the pressure P1 of the downstream passage 142g at one end of the main valve body 161.

  The main valve body 161 has a body portion 161a that receives a force [A2 × (P2-P3)] due to a pressure difference [P2-P3] between the pressure P2 of the upstream passage 142h and the pressure P3 of the back pressure chamber 142e. It acts in the valve opening direction of the body 161. “A2” is an area of the pressure receiving surface that receives the pressure P2 of the upstream passage 142h and the pressure P3 of the back pressure chamber 142e in the body portion 161a.

  Further, a load Fsp by the elastic member 162 accommodated in the back pressure chamber 142e acts on the body portion 161a of the main valve body 161 in the valve closing direction of the main valve body 161. It should be noted that the load Fsp of the main elastic member 162 of the present embodiment is the main load when the liquid phase refrigerant passage 141d is closed and the pressure difference between the pressure P2 in the upstream passage 142h and the pressure P3 in the back pressure chamber 142e increases. The valve body 161 is set to be displaced to a position away from the main valve seat portion 142f.

The opening / closing mechanism 16 of the present embodiment is established when the condition in which the main valve body 161 opens the gas-phase refrigerant passage 142b has the relationship shown in the following [Equation 1].
A2 × (P2−P3)> A1 × (P2−P1) + Fsp (Equation 1)
Here, the pressure P2 in the upstream passage 142h is the pressure upstream of the refrigerant flow of the decompression means comprising the fixed throttle 17 and the electromagnetic valve 18, and the pressure P3 in the back pressure chamber 142e is from the fixed throttle 17 and the electromagnetic valve 18. This is the pressure downstream of the refrigerant flow of the decompression means. Therefore, the opening / closing mechanism 16 of the present embodiment opens and closes the gas-phase refrigerant passage 142b according to the pressure difference before and after the pressure reducing means including the fixed throttle 17 and the electromagnetic valve 18.

  When the force acting on the main valve element 161 in the valve opening direction (the left side of [Equation 1]) is equal to or less than the force acting in the valve closing direction (the right side of [Equation 1]), as shown in FIG. Further, the main valve body 161 is displaced to a position where it comes into contact with the main valve seat 142f, and the gas-phase refrigerant passage 142b is closed.

  On the other hand, when the force acting on the main valve element 161 in the valve opening direction (the left side of [Equation 1]) exceeds the force acting in the valve closing direction (the right side of [Equation 1]), it is shown in FIG. Thus, the main valve body 161 is displaced to a position away from the main valve seat 142f, and the gas-phase refrigerant passage 142b is opened.

  Returning to FIG. 1 to FIG. 3, the outdoor heat exchanger 20 is disposed in the hood, and exchanges heat between the refrigerant circulating inside and the outside air (outside air) blown from the blower fan 21. The outdoor heat exchanger 20 functions as an evaporator that evaporates the refrigerant in the first and second heating modes and exerts a heat absorbing action, and functions as a radiator that radiates the refrigerant in the cooling operation mode and the like. It is an exchanger.

  The refrigerant inlet side of the low stage side expansion valve 22 is connected to the refrigerant outlet side of the outdoor heat exchanger 20. The low stage side expansion valve 22 depressurizes the refrigerant that flows out of the outdoor heat exchanger 20 and flows into the indoor evaporator 23 in the cooling operation mode or the like. The basic configuration of the low stage side expansion valve 22 is the same as that of the high stage side expansion valve 13, and its operation is controlled by a control signal output from the air conditioning controller 40.

  The refrigerant inlet side of the indoor evaporator 23 is connected to the outlet side of the low stage side expansion valve 22. The indoor evaporator 23 is disposed in the air conditioning case 31 of the indoor air conditioning unit 30 on the upstream side of the air flow of the indoor condenser 12, and evaporates the refrigerant during the cooling operation mode or the dehumidifying heating operation mode to absorb heat. It is a heat exchanger that cools the air blown into the vehicle interior by exhibiting the above.

  The inlet side of the accumulator 24 is connected to the refrigerant outlet side of the indoor evaporator 23. The accumulator 24 separates the gas-liquid refrigerant flowing into the accumulator 24 and stores excess refrigerant. Further, the suction port 11 b of the compressor 11 is connected to the gas phase refrigerant outlet side of the accumulator 24. Therefore, the indoor evaporator 23 is connected so as to flow out to the suction port 11 b side of the compressor 11.

  Further, on the refrigerant outlet side of the outdoor heat exchanger 20, there is a bypass passage 25 that guides the refrigerant flowing out of the outdoor heat exchanger 20 to the inlet side of the accumulator 24 by bypassing the low-stage expansion valve 22 and the indoor evaporator 23. It is connected.

  A bypass opening / closing valve 251 is disposed in the bypass passage 25. The bypass opening / closing valve 251 is an electromagnetic valve that opens and closes the bypass passage 25, and its opening / closing operation is controlled by a control signal output from the air conditioning controller 40.

  The bypass on-off valve 251 of the present embodiment functions to switch the cycle configuration (refrigerant flow path) by opening and closing the bypass passage 25. Therefore, the bypass on-off valve 251 of this embodiment constitutes a refrigerant flow path switching unit that switches the refrigerant flow path of the refrigerant circulating in the cycle. Note that the pressure loss that occurs when the refrigerant passes through the bypass on-off valve 251 is extremely small relative to the pressure loss that occurs when the refrigerant passes through the low-stage expansion valve 22.

  Accordingly, the refrigerant flowing out of the outdoor heat exchanger 20 flows into the accumulator 24 via the bypass passage 25 when the bypass on-off valve 251 is open, and low when the bypass on-off valve 251 is closed. It flows into the indoor evaporator 23 through the stage side expansion valve 22.

  By the way, the heat pump cycle 10 requires a refrigerant filling operation for filling the refrigerant into the cycle when the product is manufactured or when the cycle component equipment is exchanged. In this refrigerant filling operation, a vacuuming process for removing air and moisture in the cycle is performed, and after the vacuuming is completed, a charging process for charging a specified amount of refrigerant into the cycle is performed.

  In order to carry out such a refrigerant charging operation, the heat pump cycle 10 includes a first charging port 26a for charging the refrigerant from the high pressure side in the cycle and a second charging port 26b for charging the refrigerant from the low pressure side in the cycle. Is provided.

  In the present embodiment, the first filling port 26a is provided in the refrigerant passage from the indoor condenser 12 to the high stage side expansion valve 13, and the second filling port 26b is the refrigerant passage from the accumulator 24 to the suction port 11b of the compressor 11. Is provided. In the present embodiment, the first filling port 26a also functions as a port for performing evacuation.

  Next, the indoor air conditioning unit 30 will be described. The indoor air conditioning unit 30 is arranged inside the instrument panel (instrument panel) at the foremost part of the vehicle interior to form an outer shell of the indoor air conditioning unit 30 and to the interior of the room air blown into the vehicle interior. It has an air conditioning case 31 that forms an air passage. And the air blower 32, the above-mentioned indoor condenser 12, the indoor evaporator 23, etc. are accommodated in this air passage.

  On the most upstream side of the air flow in the air conditioning case 31, an inside / outside air switching device 33 that switches and introduces vehicle interior air (inside air) and outside air is disposed. The inside / outside air switching device 33 continuously adjusts the opening area of the inside air introduction port for introducing the inside air into the air conditioning case 31 and the outside air introduction port for introducing the outside air by the inside / outside air switching door, so that the air volume and the outside air are adjusted. The air volume ratio with the air volume is continuously changed.

  On the downstream side of the air flow of the inside / outside air switching device 33, a blower 32 that blows air sucked through the inside / outside air switching device 33 toward the vehicle interior is arranged. The blower 32 is an electric blower that drives a centrifugal multiblade fan (sirocco fan) with an electric motor, and the number of rotations (air flow rate) is controlled by a control signal output from the air conditioning control device 40.

  On the downstream side of the air flow of the blower 32, the indoor evaporator 23 and the indoor condenser 12 are arranged in the order of the indoor evaporator 23 → the indoor condenser 12 with respect to the flow of the indoor blown air. In other words, the indoor evaporator 23 is disposed on the upstream side of the air flow with respect to the indoor condenser 12.

  Further, a bypass passage 35 is provided in the air conditioning case 31 to flow the blown air after passing through the indoor evaporator 23, bypassing the indoor condenser 12, on the downstream side of the air flow of the indoor evaporator 23. An air mix door 34 is disposed on the upstream side of the air flow of the indoor condenser 12.

  The air mix door 34 adjusts the air volume ratio between the air volume that passes through the indoor condenser 12 and the air volume that passes through the bypass passage 35 in the blown air that has passed through the indoor evaporator 23, and the heat of the indoor condenser 12. It is a heat exchange capacity adjustment means for adjusting the exchange capacity. The air mix door 34 is driven by a servo motor (not shown) whose operation is controlled by a control signal output from the air conditioning controller 40.

  Further, on the downstream side of the air flow of the indoor condenser 12 and the bypass passage 35, blown air heated by exchanging heat with the refrigerant in the indoor condenser 12 and blown air not heated through the bypass passage 35 are present. A merge space 36 for merging is provided.

  In the most downstream part of the air flow of the air conditioning case 31, an opening hole is formed through which the blown air merged in the merge space 36 is blown out to the vehicle interior that is the air conditioning target space. Specifically, the defroster opening hole 37a that blows the conditioned air toward the inner side surface of the front window glass of the vehicle, the face opening hole 37b that blows the conditioned air toward the upper body of the occupant in the vehicle interior, and the conditioned air toward the feet of the occupant A foot opening hole 37c to be blown out is formed.

  The air flow downstream side of each of the opening holes 37a to 37c is connected to a face air outlet, a foot air outlet, and a defroster air outlet provided in the vehicle interior via ducts that form air passages.

  Further, a defroster door 38a for opening and closing the defroster opening hole 37a, a face door 38b for opening and closing the face opening hole 37b, and a foot door 38c for opening and closing the foot opening hole 37c are arranged on the upstream side of the air flow of each opening hole 37a to 37c. ing. Each door 38a-38c comprises the blowing mode switching means which switches the blowing mode of the air to a vehicle interior. Each door 38a to 38c is driven by a servo motor (not shown) whose operation is controlled by a control signal output from the air conditioning control device 40.

  Next, the electric control unit of this embodiment will be described. The air conditioning control device 40 includes a known microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. The air conditioning control device 40 performs various calculations and processes based on a control program stored in a ROM or the like, and controls each control device (compressor 11, high stage expansion valve 13, electromagnetic valve 18, bypass) connected to the output side. The operation of the on-off valve 251 and the blower 32).

  A sensor group 41 for various air conditioning controls is connected to the input side of the air conditioning control device 40. The sensor group 41 includes an inside air sensor that detects the temperature in the vehicle interior, an outside air sensor that detects the outside air temperature, a solar radiation sensor that detects the amount of solar radiation in the vehicle interior, an evaporator temperature sensor that detects the temperature of the indoor evaporator 23, and a compressor. 11 is a discharge pressure sensor that detects the pressure of the high-pressure refrigerant discharged from No. 11.

  Further, an operation panel (not shown) arranged near the instrument panel is connected to the input side of the air conditioning control device 40, and operation signals from various air conditioning operation switches provided on the operation panel are input. Specifically, various air conditioning operation switches provided on the operation panel include an operation switch of the vehicle air conditioner 1, a vehicle interior temperature setting switch for setting the vehicle interior temperature, a selection switch between the cooling operation mode and the heating operation mode, and the like. Is provided.

  Here, the air-conditioning control device 40 is configured such that control means for controlling the operation of each control device connected to the output side is integrally configured, but the configuration for controlling the operation of each control device (hardware and Software) constitutes control means for controlling the operation of each control device.

  For example, in this embodiment, the configuration (hardware and software) for controlling the opening / closing operation of the solenoid valve 18 and the bypass opening / closing valve 251 constitutes the flow path switching control means. The flow path switching control means in the air conditioning control device 40 may be configured by a control device different from the air conditioning control device 40.

  Next, the refrigerant | coolant filling operation | work to the heat pump cycle 10 of this embodiment in the said structure and the action | operation of the vehicle air conditioner 1 are demonstrated. First, the refrigerant | coolant filling operation | work to the heat pump cycle 10 of this embodiment is demonstrated.

  In the refrigerant filling operation, a refrigerant filling device (not shown) having a vacuum pump and a refrigerant filling pump is connected to the first and second filling ports 26a and 26b. Then, with the solenoid valve 18 and the bypass on-off valve 251 set to the open state, air or the like remaining in the cycle is sucked from the first filling port 26a by the refrigerant filling device (evacuation step). In the evacuation step, for example, air remaining in the cycle may be sucked from the second filling port 26b by the refrigerant filling device.

  Here, according to the configuration of the integrated valve 14 of the present embodiment, it is possible to solve the problem that the vacuum suction of the intermediate pressure refrigerant passage 15 that occurs when the intermediate pressure port 11d of the compressor 11 is closed can not be performed. This point will be described below.

  When evacuation is performed by the refrigerant filling device, the upstream side passage 142h of the gas-phase refrigerant passage 142b and the back pressure chamber 142e are evacuated, and the pressure difference between the pressure P2 of the upstream side passage 142h and the pressure P3 of the back pressure chamber 142e. Hardly occurs. For this reason, as shown in FIG. 6, the opening / closing mechanism 16 is displaced to a position where the seal member 161 d provided at one end contacts the main valve seat 142.

  At this time, in this embodiment, power supply to the solenoid 182 is stopped at least temporarily in the vacuuming step, and the upstream side passage 142h and the downstream side passage 142g of the gas-phase refrigerant passage 142b are connected via the bypass communication passage 144. To communicate with.

  As a result, even when the intermediate pressure port 11d of the compressor 11 is closed when the evacuation step is performed, air existing in the downstream side passage 142g and the intermediate pressure refrigerant passage 15 via the bypass communication passage 144, etc. Can be aspirated.

  Subsequently, after completion of the evacuation step, the refrigerant is filled into the cycle from the first filling port 26a and the second filling port 26b by the refrigerant filling device (a filling step). In the filling step, the refrigerant may be filled into the cycle from one of the first filling port 26a and the second filling port 26b by the refrigerant filling device.

  Here, according to the configuration of the integrated valve 14 of the present embodiment, the problem that the refrigerant cannot be filled in the intermediate pressure refrigerant passage 15 that occurs when the intermediate pressure refrigerant passage 15 is in a vacuum state (P1≈0) is solved. be able to. This point will be described below.

  If the refrigerant is charged while the intermediate pressure refrigerant passage 15 is in a vacuum state (P1≈0), the pressure difference between the pressure P2 in the upstream passage 142h and the pressure P1 in the downstream passage 142g increases. The force acting in the valve closing direction on one end of the opening / closing mechanism 16 increases. For this reason, as shown in FIG. 6, the opening / closing mechanism 16 is displaced to a position where the seal member 161 d provided at one end contacts the main valve seat 142.

  At this time, in the present embodiment, in the filling process, power supply to the solenoid 182 is stopped at least temporarily, and the upstream side passage 142h and the downstream side passage 142g of the gas-phase refrigerant passage 142b are connected via the bypass communication passage 144. To communicate with.

  Thus, even when the intermediate pressure refrigerant passage 15 is in a vacuum state (P1≈0) when performing the filling step, the downstream passage 142g and the intermediate pressure refrigerant passage 15 are connected via the bypass communication passage 144. Refrigerant can be filled.

  Next, the operation of the vehicle air conditioner 1 of the present embodiment will be described. The vehicle air conditioner 1 can be switched to a cooling operation mode, a heating operation mode, and a dehumidifying heating operation mode. Hereinafter, the operation in each operation mode will be described.

(A) Cooling operation mode The cooling operation mode is started when, for example, the cooling operation mode is selected by the selection switch in a state where the operation switch of the operation panel is turned on (ON).

  In the cooling operation mode, the air-conditioning control device 40 opens the high stage side expansion valve 13 in a fully open state (a state in which the pressure reducing action is not exerted), the low stage side expansion valve 22 is in a throttling state (a state in which the pressure reducing action is exerted), The valve 251 is closed.

  Further, the air-conditioning control device 40 supplies power to the solenoid 182 of the electromagnetic valve 18, the liquid-phase side valve body 181 opens the liquid-phase refrigerant passage 141d (the electromagnetic valve 18 is opened), and the bypass valve body 183 is bypassed. The passage 144 is closed. In this case, the pressure before and after the fixed throttle 17 becomes equal, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is closed as shown in FIG. Thereby, the heat pump cycle 10 is switched to the refrigerant circuit through which the refrigerant flows as shown by the solid line arrows in FIG.

  With this refrigerant circuit configuration, the air conditioning control device 40 reads the detection signal of the sensor group 41 for air conditioning control and the operation signal of the operation panel, and calculates the target blowing temperature TAO, which is the target temperature of the air blown into the passenger compartment. Furthermore, the operating state of each control device connected to the output side of the air conditioning control device 40 is determined based on the calculated target blowing temperature TAO and the detection signal of the sensor group.

  For example, the control signal output to the electric motor of the compressor 11 is determined as follows. First, the target evaporator outlet temperature TEO of the indoor evaporator 23 is determined based on the target outlet temperature TAO with reference to a control map stored in the air conditioning controller 40 in advance. And the control signal output to the electric motor of the compressor 11 is determined so that the detected value (blowing air temperature) of the evaporator temperature sensor approaches the target evaporator blowing temperature TEO.

  As for the control signal output to the low-stage side expansion valve 22, the target supercooling degree that is determined in advance so that the degree of supercooling of the refrigerant flowing into the low-stage side expansion valve 22 approaches the COP substantially to the maximum value. It is decided to approach.

  Regarding the control signal output to the servo motor of the air mix door 34, the air mix door 34 closes the air passage of the indoor condenser 12, and the total flow rate of the blown air after passing through the indoor evaporator 23 is the bypass passage 35. Is determined to pass.

  Then, the control signal determined as described above is output to each control device. Thereafter, reading of each signal → calculation of the target blowout temperature TAO → determination of the operating state of each control device → output of the control signal at every predetermined control period until the operation stop of the vehicle air conditioner 1 is requested by the operation panel The control routine is repeated. Such a control routine is repeated in the other operation modes.

Therefore, in the heat pump cycle 10 of the cooling operation mode, as shown in the Mollier diagram of FIG. 8, the inflow high pressure refrigerant discharged from the discharge port 11c of compressor 11 (a ₁₁ point in FIG. 8) into the indoor condenser 12 To do. At this time, since the air mix door 34 closes the air passage of the indoor condenser 12, the refrigerant flowing into the indoor condenser 12 flows out of the indoor condenser 12 without radiating heat to the indoor blowing air.

  Since the high-stage expansion valve 13 is fully opened, the refrigerant flowing out of the indoor condenser 12 is almost not decompressed by the high-stage expansion valve 13 and enters the gas-liquid separation space 141b in the integrated valve 14. Inflow.

  At this time, although the refrigerant flowing into the gas-liquid separation space 141b is in a gas phase state, the opening / closing mechanism 16 is in a closed state, so that the refrigerant flows from the gas phase side outlet 142a to the intermediate pressure refrigerant passage 15. It flows into the liquid-phase refrigerant passage 141d without flowing out.

  Subsequently, the refrigerant that has flowed into the liquid-phase refrigerant passage 141d flows out from the liquid-phase side outlet 141e of the integrated valve 14 without being almost depressurized by the fixed throttle 17 because the electromagnetic valve 18 is in an open state. To do.

The refrigerant that has flowed out of the liquid-phase side outlet 141e of the integrated valve 14 flows into the outdoor heat exchanger 20, and exchanges heat with the outside air blown from the blower fan 21 in the outdoor heat exchanger 20 to dissipate heat (FIG. 8). A ₁₁ points → b ₁₁ points). Since the bypass on / off valve 251 is closed, the refrigerant that has flowed out of the outdoor heat exchanger 20 enters the throttled low-stage expansion valve 22 until it becomes a low-pressure refrigerant. reduced pressure is expanded in manner _{(b 11} points in FIG. 8 → _{c 11} points).

The refrigerant decompressed by the low stage side expansion valve 22, flows into the indoor evaporator 23, and absorbs heat from the air in-room air blown from the blower 32 to evaporate (c ₁₁ points in FIG. 8 → d ₁₁ points ). Thereby, indoor ventilation air is cooled.

The refrigerant flowing out of the indoor evaporator 23 flows into the accumulator 24 and is separated into gas and liquid. Then, the suction port 11b of the separated gas-phase refrigerant compressor 11 is sucked from the _{(e 11} points in FIG. 8), it is compressed again _{(e 11} points in FIG. 8 → _{a1 11} points → _{a 11} points). In addition, the liquid phase refrigerant | coolant isolate | separated in the accumulator 24 is stored in the accumulator 24 as a surplus refrigerant | coolant which is not required in order to exhibit the refrigerating capacity for which the cycle is requested | required.

Here, the reason why the point d _{11 and the} point e ₁₁ are different in FIG. 8 is that the pressure loss generated in the gas phase refrigerant flowing through the refrigerant pipe from the accumulator 24 to the suction port 11 b of the compressor 11 and the gas phase refrigerant are This represents the amount of heat absorbed from the outside (outside air). Therefore, in an ideal cycle, it is desirable that d ₁₁ points and e ₁₁ points match. The same applies to the following Mollier diagram.

  As described above, in the cooling operation mode, since the air passage of the indoor condenser 12 is closed by the air mix door 34, the blown air cooled by the indoor evaporator 23 can be blown out into the vehicle interior. Thereby, cooling of a vehicle interior is realizable.

(B) Heating operation mode Next, heating operation mode is demonstrated. This heating operation mode is started, for example, when the heating operation mode is selected by the selection switch while the operation switch of the operation panel is turned on (ON).

  When the heating operation mode is started, the air conditioning control device 40 reads the detection signal of the sensor group 41 and the operation signal of the operation panel, and determines the refrigerant discharge capacity (the rotation speed of the compressor 11) of the compressor 11. Furthermore, according to the determined rotation speed, 1st heating mode or 2nd heating mode is performed.

(B1): First Heating Mode First, the first heating mode will be described. In the first heating mode, the air conditioning control device 40 is in the throttled state of the high stage expansion valve 13 and in the fully closed state of the low stage side expansion valve 22. Then, the bypass on-off valve 251 is opened.

  Further, the air-conditioning control device 40 stops supplying power to the solenoid 182 of the electromagnetic valve 18, the liquid-phase side valve body 181 closes the liquid-phase refrigerant passage 141d (the electromagnetic valve 18 is closed), and the bypass valve body 183. Is in a state where the bypass communication path 144 is opened. In this case, the pressure difference before and after the fixed throttle 17 increases, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is opened, as shown in FIG. Thereby, the heat pump cycle 10 is switched to a refrigerant flow (a refrigerant circuit of a gas injection cycle) as indicated by a solid arrow in FIG.

  With this refrigerant circuit configuration, the air-conditioning control device 40 reads the detection signal of the sensor group 41 and is connected to the output side of the air-conditioning control device 40 based on the target blowing temperature TAO and the like, as in the cooling operation mode. Determine the operating state of various control devices.

  The control signal output to the high stage expansion valve 13 in the first heating mode is such that the refrigerant pressure in the indoor condenser 12 becomes a predetermined target high pressure, or the refrigerant that flows out from the indoor condenser 12. The degree of supercooling is determined to be a predetermined target degree of supercooling. For the control signal output to the servo motor of the air mix door 34, the air mix door 34 closes the bypass passage 35, and the entire flow rate of the blown air after passing through the indoor evaporator 23 passes through the indoor condenser 12. To be determined.

Therefore, in the heat pump cycle 10 of the first heating mode, as shown in FIG. 9, the high-pressure refrigerant discharged from the discharge port 11c of compressor 11 (a ₁₂ point in FIG. 9) flows into indoor condenser 12. The refrigerant flowing into the indoor condenser 12 is blown to the heat dissipation in the indoor air blown heat exchanger passing through the interior evaporator 23 from the blower 32 (a ₁₂ point in Figure 9 → b ₁₂ points). Thereby, indoor blowing air is heated.

Refrigerant flowing from the indoor condenser 12 is isenthalpic depressurize expansion in the high stage side expansion valve 13 which has a stop state until the intermediate-pressure refrigerant (b ₁₂ points in FIG. 9 → c1 ₁₂ points) . The intermediate-pressure refrigerant decompressed by the high-stage expansion valve 13, flows into the gas-liquid separation space 141b of the integrated valve 14, gas-liquid is separated by the gas-liquid separation space 141b (c ₁₂ in FIG. 9 point → _{c2 12 points, 12} points _c → _{c3 12} points).

The gas-phase refrigerant separated in the gas-liquid separation space 141b flows into the intermediate-pressure refrigerant passage 15 from the gas-phase side outlet 142a because the opening / closing mechanism 16 is in the open state, and the intermediate-pressure refrigerant passage 15 To the intermediate pressure port 11d of the compressor 11 (c2 ₁₂ points in FIG. 9). Then, the refrigerant flowing into the intermediate pressure port 11d merges with the refrigerant in the compression process in the compression chamber 11a ( ₁₂ points a1 in FIG. 9) ( ₁₂ points a2 in FIG. 9), and is compressed in the compression chamber 11a.

On the other hand, the liquid phase refrigerant separated in the gas-liquid separation space 141b flows into the liquid phase refrigerant passage 141d. At this time, since the solenoid valve 18 is in a fully closed state, it is decompressed and expanded in an isoenthalpy manner until it becomes a low-pressure refrigerant in the fixed throttle 17 (c3 ₁₂ points → c4 ₁₂ points in FIG. 9). Then, the refrigerant decompressed by the fixed throttle 17 flows out from the liquid phase side outlet 141e of the integrated valve 14.

The refrigerant flowing out from the liquid-phase side outlet 141e of the integrated valve 14 flows into the outdoor heat exchanger 20, exchanges heat with the outside air blown from the blower fan 21, and absorbs heat (c4 ₁₂ points → d in FIG. 9). ₁₂ points). The refrigerant that has flowed out of the outdoor heat exchanger 20 flows into the accumulator 24 through the bypass passage 25 because the low-stage expansion valve 22 is fully closed and the bypass opening / closing valve 251 is open. Gas-liquid separation. The compressed again vapor-phase refrigerant separated by the accumulator 24 is sucked from the suction port 11b of the compressor 11 (e ₁₂ points in FIG. 9).

  As described above, in the first heating mode, the heat of the refrigerant discharged from the compressor 11 by the indoor condenser 12 can be radiated to the indoor blowing air, and the heated indoor blowing air can be blown out into the vehicle interior. . Thereby, heating of a vehicle interior is realizable.

  In the first heating mode, the low-pressure refrigerant decompressed by the fixed throttle 17 is sucked into the compressor 11 and the intermediate-pressure refrigerant decompressed by the high stage side expansion valve 13 is used as the refrigerant in the compression process of the compressor 11. A gas injection cycle to be merged can be configured.

  Thereby, the pressure difference between the suction refrigerant pressure and the discharge refrigerant pressure of the compressor 11 can be reduced, and the compression efficiency of the compressor 11 can be improved. As a result, the COP of the heat pump cycle 10 as a whole can be improved.

(B2): Second Heating Mode Next, the second heating mode will be described. In the second heating mode, the air conditioning control device 40 is in the throttled state of the high stage side expansion valve 13 and fully closed the low stage side expansion valve 22. State, the bypass on-off valve 251 is opened.

  Further, the air-conditioning control device 40 supplies power to the solenoid 182 of the electromagnetic valve 18, the liquid-phase side valve body 181 opens the liquid-phase refrigerant passage 141d (the electromagnetic valve 18 is opened), and the bypass valve body 183 is bypassed. The passage 144 is closed. In this case, the pressure before and after the fixed throttle 17 becomes equal, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is closed as shown in FIG. Thereby, the heat pump cycle 10 is switched to the refrigerant circuit through which the refrigerant flows as shown by the solid line arrows in FIG.

  With this refrigerant circuit configuration, the air conditioning control device 40 reads the detection signal of the sensor group 41 and the like, and based on the target blowing temperature TAO and the like, the operating state of each control device connected to the output side of the air conditioning control device 40 is determined. decide. In addition, about the control signal etc. which are output to the high stage side expansion valve 13 at the time of 2nd heating mode, it determines similarly to 1st heating mode.

Therefore, in the heat pump cycle 10 of the second heating mode, as shown in FIG. 10, the high-pressure refrigerant discharged from the discharge port 11c of compressor 11 (a ₁₃ point in FIG. 10) flows into the indoor condenser 12, indoor blowing air exchanges heat dissipating _{(a 13} point of FIG. 10 → _{b 13} points). Thereby, indoor blowing air is heated.

The refrigerant flowing from the indoor condenser 12 is isenthalpic depressurize expansion in to have the high-stage expansion valve 13 to a stop state until a low-pressure refrigerant (b ₁₃ points in FIG. 10 → c ₁₃ points), integration It flows into the gas-liquid separation space 141b of the valve 14.

  The refrigerant that has flowed into the gas-liquid separation space 141b flows out from the gas-phase side outlet 142a to the intermediate pressure refrigerant passage 15 because the opening / closing mechanism 16 is in a closed state, as in the cooling operation mode. Without flowing into the liquid-phase refrigerant passage 141d.

  Subsequently, the refrigerant that has flowed into the liquid-phase refrigerant passage 141d flows out from the liquid-phase side outlet 141e of the integrated valve 14 without being almost depressurized by the fixed throttle 17 because the electromagnetic valve 18 is in an open state. To do.

The refrigerant flowing out from the liquid-phase side outlet 141e of the integrated valve 14 flows into the outdoor heat exchanger 20, and exchanges heat with the outside air blown from the blower fan 21 in the outdoor heat exchanger 20 to absorb heat (FIG. 10). C ₁₃ points → d ₁₃ points). Since the subsequent operation is the same as in the first heating mode, description thereof is omitted.

  As described above, in the second heating mode, the heat of the refrigerant discharged from the compressor 11 by the indoor condenser 12 can be radiated to the indoor blowing air, and the heated indoor blowing air can be blown out into the vehicle interior. . Thereby, heating of a vehicle interior is realizable.

  Here, the effect of executing the second heating mode when the heating load is relatively low, such as when the outside air temperature is high, is described with respect to the first heating mode. In the first heating mode, since the gas injection cycle can be configured as described above, the COP of the heat pump cycle 10 as a whole can be improved.

  That is, theoretically, if the rotation speed of the compressor 11 is the same, the first heating mode can exhibit higher heating performance than that in the second heating mode. In other words, the rotation speed (refrigerant discharge capacity) of the compressor 11 necessary for exhibiting the same heating performance is lower in the first heating mode than in the second heating mode.

  However, the compressor 11 has a maximum efficiency rotational speed at which the compression efficiency is maximized (peak), and the compression efficiency is greatly reduced when the rotational speed is lower than the maximum efficient rotational speed. For this reason, when the compressor 11 is operated at a rotation speed lower than the maximum efficiency rotation speed when the heating load is relatively low, the COP may decrease in the first heating mode.

  Therefore, in the present embodiment, when the rotation speed of the compressor 11 becomes equal to or less than the reference rotation speed during execution of the first heating mode with the above-described maximum efficiency rotation speed as the reference rotation speed, the second heating mode is entered. I try to switch. Note that the switching from the second heating mode to the first heating mode is performed when the rotation speed becomes equal to or higher than a predetermined rotation amount added to the reference rotation speed during execution of the second heating mode. That's fine.

  Thereby, the operation mode which can exhibit high COP can be selected among 1st heating mode and 2nd heating mode. Therefore, even when the rotation speed of the compressor 11 becomes equal to or lower than the reference rotation speed during the execution of the first heating mode, the COP of the heat pump cycle 10 as a whole is improved by switching to the second heating mode. Can be made.

(C) Dehumidification heating operation mode Next, the dehumidification heating operation mode will be described. The dehumidifying and heating operation mode is executed, for example, when the set temperature set by the vehicle interior temperature setting switch in the cooling operation mode is set higher than the outside air temperature.

  In the dehumidifying and heating operation mode, the air conditioning control device 40 sets the high stage expansion valve 13 and the low stage side expansion valve 22 to a fully open state or a throttle state, and sets the bypass opening / closing valve 251 to a closed state.

  Further, the air-conditioning control device 40 supplies power to the solenoid 182 of the electromagnetic valve 18, the liquid-phase side valve body 181 opens the liquid-phase refrigerant passage 141d (the electromagnetic valve 18 is opened), and the bypass valve body 183 is bypassed. The passage 144 is closed. In this case, the pressure before and after the fixed throttle 17 becomes equal, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is closed as shown in FIG. Thereby, the heat pump cycle 10 is switched to the refrigerant circuit through which the refrigerant flows as shown by the solid line arrows in FIG.

  With this refrigerant circuit configuration, the air-conditioning control device 40 reads the detection signal of the sensor group 41 and is connected to the output side of the air-conditioning control device 40 based on the target blowing temperature TAO and the like, as in the cooling operation mode. Determine the operating state of each control device.

  For example, for the control signal output to the servo motor of the air mix door 34, the air mix door 34 closes the bypass passage 35, and the entire flow rate of the blown air after passing through the indoor evaporator 23 passes through the indoor condenser 12. To be determined.

  Further, in the dehumidifying and heating operation mode of the present embodiment, the throttle openings of the high stage side expansion valve 13 and the low stage side expansion valve 22 are changed according to the temperature difference between the set temperature and the outside air temperature. Specifically, the following first to fourth dehumidifying heating modes are executed as the target blowing temperature TAO increases.

(C1): 1st dehumidification heating mode In 1st dehumidification heating mode, the high stage side expansion valve 13 is made into a full open state, and the low stage side expansion valve 22 is made into a throttle state. Therefore, although the cycle configuration (refrigerant flow path) is exactly the same as that in the cooling operation mode, the air mix door 34 fully opens the air passage of the indoor condenser 12, so that the state of the refrigerant circulating in the cycle is It changes as shown in the Mollier diagram of FIG.

That is, as shown in FIG. 11, the high-pressure refrigerant discharged from the discharge port 11 c of the compressor 11 (point a _{14 in} FIG. 11) flows into the indoor condenser 12 and is cooled by the indoor evaporator 23. Heat is exchanged with the dehumidified indoor air to radiate heat ( ₁₄ points in FIG. 11 → ₁₄ points in b1). Thereby, indoor blowing air is heated.

  Since the high-stage expansion valve 13 is fully opened, the refrigerant flowing out of the indoor condenser 12 is almost not decompressed by the high-stage expansion valve 13 and enters the gas-liquid separation space 141b in the integrated valve 14. Inflow.

  Then, the refrigerant that has flowed into the gas-liquid separation space 141b of the integrated valve 14 flows out from the liquid-phase side outlet 141e with almost no pressure reduction by the fixed throttle 17, as in the cooling operation mode, and the outdoor heat exchanger 20 Flow into.

The refrigerant flowing into the outdoor heat exchanger 20 exchanges heat with the outside air blown from the blower fan 21 to dissipate heat (b1 ₁₄ points → b2 ₁₄ points in FIG. 11). Since the subsequent operations are the same as those in the cooling operation mode, description thereof is omitted.

  As described above, in the first dehumidifying and heating mode, the indoor blown air cooled and dehumidified by the indoor evaporator 23 can be heated by the indoor condenser 12 and blown out into the vehicle interior. Thereby, dehumidification heating of a vehicle interior is realizable.

(C2): Second Dehumidifying Heating Mode Next, when the target blowing temperature TAO becomes higher than a predetermined first reference temperature during execution of the first dehumidifying heating mode, the second dehumidifying heating mode is executed. Is done. In the second dehumidifying and heating mode, the high stage side expansion valve 13 is set to the throttled state, and the throttle opening degree of the low stage side expansion valve 22 is set to the throttled state that is increased compared to the first dehumidifying and heating mode. Therefore, in the second dehumidifying and heating mode, the state of the refrigerant circulating in the cycle changes as shown in the Mollier diagram of FIG.

That is, as shown in FIG. 12, the high-pressure refrigerant discharged from the discharge port 11c of compressor 11 (a ₁₅ point in FIG. 12), as in the first dehumidification and heating mode, and flows into indoor condenser 12, Heat is exchanged with the indoor blast air cooled and dehumidified by the indoor evaporator 23 to dissipate heat (a ₁₅ points → b 1 ₁₅ points in FIG. 12). Thereby, indoor blowing air is heated.

The refrigerant that has flowed out of the indoor condenser 12 is decompressed in an enthalpy manner until it becomes an intermediate pressure refrigerant having a temperature higher than the outside air temperature by the high-stage expansion valve 13 that is in a throttled state (b1 _{15 in} FIG. 12). → b2 ₁₅ points).

  The refrigerant depressurized by the high stage side expansion valve 13 flows into the gas-liquid separation space 141b of the integrated valve 14 and is substantially evacuated by the fixed throttle 17 as in the cooling operation mode. It flows out from the outlet 141e.

The refrigerant that has flowed out of the liquid-phase side outlet 141e of the integrated valve 14 flows into the outdoor heat exchanger 20, and exchanges heat with the outside air blown from the blower fan 21 in the outdoor heat exchanger 20 to dissipate heat (FIG. 12). B2 ₁₅ points → b3 ₁₅ points).

Further, the refrigerant that has flowed out of the outdoor heat exchanger 20 is decompressed in an enthalpy manner by the low-stage side expansion valve 22 (b3 ₁₅ point → c ₁₅ point in FIG. 12), and flows into the indoor evaporator 23. Since the subsequent operations are the same as those in the cooling operation mode, description thereof is omitted.

  As described above, in the second dehumidifying and heating mode, similarly to the first dehumidifying and heating mode, the indoor blowing air cooled and dehumidified by the indoor evaporator 23 is heated by the indoor condenser 12 and blown out into the vehicle interior. Can do. Thereby, dehumidification heating of a vehicle interior is realizable.

  At this time, in the second dehumidifying and heating mode, since the high stage side expansion valve 13 is in the throttle state, the temperature of the refrigerant flowing into the outdoor heat exchanger 20 can be lowered compared to the first dehumidifying and heating mode. Therefore, the temperature difference between the temperature of the refrigerant in the outdoor heat exchanger 20 and the outside air temperature can be reduced, and the amount of heat released from the refrigerant in the outdoor heat exchanger 20 can be reduced.

  As a result, it is possible to increase the refrigerant pressure in the indoor condenser 12 without increasing the refrigerant circulation flow rate that circulates the cycle with respect to the first dehumidifying and heating mode, and from the indoor condenser 12 than in the first dehumidifying and heating mode. The temperature to be blown out can be increased.

(C3): Third dehumidifying heating mode Next, during the execution of the second dehumidifying heating mode, the target blowing temperature TAO became higher than a predetermined second reference temperature (second reference temperature> first reference temperature). At that time, the third dehumidifying heating mode is executed. In the third dehumidifying and heating mode, the throttle opening of the high stage side expansion valve 13 is set to a throttled state smaller than that in the second dehumidifying and heating mode, and the throttle opening of the low stage side expansion valve 22 is set to be lower than that in the second dehumidifying and heating mode. increase. Therefore, in the third dehumidifying heating mode, the state of the refrigerant circulating in the cycle changes as shown in the Mollier diagram of FIG.

That is, as shown in FIG. 13, the high-pressure refrigerant (a point _{16 in} FIG. 13) discharged from the discharge port 11c of the compressor 11 flows into the indoor condenser 12 as in the first dehumidifying heating mode. Heat is exchanged with the indoor blast air cooled and dehumidified by the indoor evaporator 23 to dissipate heat (a ₁₆ points → b ₁₆ points in FIG. 13). Thereby, indoor blowing air is heated.

The refrigerant that has flowed out of the indoor condenser 12 is decompressed in an enthalpy manner until it becomes an intermediate-pressure refrigerant having a temperature lower than the outside air temperature by the high-stage expansion valve 13 that is in a throttled state (b ₁₆ points in FIG. 13). → c1 ₁₆ points).

  The refrigerant depressurized by the high stage side expansion valve 13 flows into the gas-liquid separation space 141b of the integrated valve 14 and is almost depressurized by the fixed throttle 17 as in the cooling operation mode. 141e flows out.

The refrigerant that has flowed out of the liquid-phase side outlet 141e flows into the outdoor heat exchanger 20, and absorbs heat by exchanging heat with the outside air blown from the blower fan 21 in the outdoor heat exchanger 20 (c1 ₁₆ points in FIG. 13). → c2 ₁₆ points).

Furthermore, the refrigerant that has flowed out of the outdoor heat exchanger 20 is decompressed in an enthalpy manner by the low stage side expansion valve 22 (c2 ₁₆ points → c3 ₁₆ points in FIG. 13), and flows into the indoor evaporator 23. Since the subsequent operations are the same as those in the cooling operation mode, description thereof is omitted.

  As described above, in the third dehumidifying and heating mode, similarly to the first dehumidifying and heating mode, the indoor blowing air cooled and dehumidified by the indoor evaporator 23 is heated by the indoor condenser 12 and blown out into the vehicle interior. Can do. Thereby, dehumidification heating of a vehicle interior is realizable.

  At this time, in the third dehumidifying and heating mode, the outdoor heat exchanger 20 is caused to act as an evaporator by reducing the throttle opening of the high stage side expansion valve 13. The heat absorption amount of the refrigerant in the outdoor heat exchanger 20 can be increased.

  As a result, the suction refrigerant density of the compressor 11 can be increased with respect to the second dehumidifying heating mode, and the refrigerant pressure in the indoor condenser 12 can be increased without increasing the rotational speed of the compressor 11. it can. Therefore, in the 3rd dehumidification heating mode, the temperature blown out from the indoor condenser 12 can be raised rather than the 2nd dehumidification heating mode.

(C4): Fourth Dehumidifying Heating Mode Next, during the execution of the third dehumidifying heating mode, the target blowing temperature TAO has become higher than a predetermined third reference temperature (third reference temperature> second reference temperature). At that time, the fourth dehumidifying heating mode is executed. In the fourth dehumidifying and heating mode, the throttle opening of the high stage side expansion valve 13 is set to a throttled state smaller than that in the third dehumidifying and heating mode, and the low stage side expansion valve 22 is fully opened. Therefore, in the fourth dehumidifying and heating mode, the state of the refrigerant circulating in the cycle changes as shown in the Mollier diagram of FIG.

That is, as shown in FIG. 14, the high-pressure refrigerant (point a _{17 in} FIG. 14) discharged from the discharge port 11 c of the compressor 11 flows into the indoor condenser 12 as in the first dehumidifying heating mode, Heat is exchanged with the indoor blast air cooled and dehumidified by the indoor evaporator 23 to radiate heat (a point _{17 in} FIG. 14 → b point ₁₇ ). Thereby, indoor blowing air is heated.

The refrigerant that has flowed out of the indoor condenser 12 is decompressed in an enthalpy manner until it becomes a low-pressure refrigerant having a temperature lower than the outside air temperature by the high-stage expansion valve 13 that is in the throttled state (b _{17 in} FIG. 14 → c1 ₁₇ points).

  The refrigerant depressurized by the high stage side expansion valve 13 flows into the gas-liquid separation space 141b of the integrated valve 14 and is almost depressurized by the fixed throttle 17 as in the cooling operation mode. 141e flows out.

The refrigerant flowing out from the liquid-phase side outlet 141e of the integrated valve 14 flows into the outdoor heat exchanger 20, and in the outdoor heat exchanger 20, exchanges heat with the outside air blown from the blower fan 21 to absorb heat (FIG. 14). C1 ₁₇ points → c2 ₁₇ points).

  Furthermore, the refrigerant that has flowed out of the outdoor heat exchanger 20 flows into the indoor evaporator 23 without being depressurized because the low-stage expansion valve 22 is fully open. Since the subsequent operations are the same as those in the cooling operation mode, description thereof is omitted.

  As described above, in the fourth dehumidifying and heating mode, similarly to the first to third dehumidifying and heating modes, the indoor blast air cooled and dehumidified by the indoor evaporator 23 is heated by the indoor condenser 12 and is Can be blown into the room. Thereby, dehumidification heating of a vehicle interior is realizable.

  At this time, in the fourth dehumidifying and heating mode, the outdoor heat exchanger 20 is operated as an evaporator as in the third dehumidifying and heating mode, and the throttle opening of the high stage side expansion valve 13 is reduced as compared with the third dehumidifying and heating mode. Therefore, the refrigerant evaporation temperature in the outdoor heat exchanger 20 can be lowered. Therefore, the temperature difference between the temperature of the refrigerant in the outdoor heat exchanger 20 and the outside air temperature can be increased more than in the third dehumidifying and heating mode, and the heat absorption amount of the refrigerant in the outdoor heat exchanger 20 can be increased.

  As a result, the suction refrigerant density of the compressor 11 can be increased with respect to the third dehumidifying heating mode, and the refrigerant pressure in the indoor condenser 12 can be increased without increasing the rotational speed of the compressor 11. it can. Therefore, in the 4th dehumidification heating mode, the temperature blown out from the indoor condenser 12 can be raised rather than the 3rd dehumidification heating mode.

  In the vehicle air conditioner 1 of the present embodiment described above, various cycle configurations are realized by switching the refrigerant circuit of the heat pump cycle 10 as described above, and appropriate cooling, heating, and dehumidifying heating in the vehicle interior are achieved. Can be realized.

  In the vehicle air conditioner 1 that is applied to an electric vehicle as in the present embodiment, the waste heat of the engine cannot be used for heating the passenger compartment as in a vehicle equipped with an internal combustion engine (engine). Therefore, as in the heat pump cycle 10 of the present embodiment, it is extremely effective that a high COP can be exhibited regardless of the heating load by switching to the gas injection cycle and the normal cycle in the heating operation mode.

  In the present embodiment, the opening / closing mechanism 16, the gas-liquid separation means (gas-liquid separation space 141b), the fixed throttle 17, the electromagnetic valve 18 and the like necessary for causing the heat pump cycle 10 to function as a gas injection cycle are integrated. The integrated valve 14 constructed in a conventional manner is employed. For this reason, the heat pump cycle 10 capable of switching between the gas injection cycle and the normal cycle can be realized with a simple cycle configuration.

  In particular, in the integrated valve 14 of the present embodiment, when the solenoid 182 displaces the liquid-phase side valve body 181 to the closed position of the liquid-phase refrigerant passage 141d, the bypass valve body 183 opens the bypass communication passage 144. It has a displacement structure. That is, according to the integrated valve 14 of this embodiment, the liquid-phase side valve body 181 is displaced to the closed position of the liquid-phase refrigerant passage 141d, thereby opening the bypass communication passage 144 and upstream of the gas-phase refrigerant passage 142b. The side passage 142h and the downstream side passage 142g can be communicated with each other.

  As a result, even when the intermediate pressure port 11d of the compressor 11 is closed when evacuation is performed, the liquid phase side valve body 181 is displaced to the closed position of the liquid phase refrigerant passage 141d, and the bypass communication passage 144 is By opening, the intermediate pressure refrigerant passage 15 can be evacuated.

  Further, even if the pressure in the downstream side passage 142g becomes vacuum (pressure ≈ 0) due to the evacuation of the refrigerant filling operation, the liquid phase side valve body 181 is displaced to the closed position of the liquid phase refrigerant passage 141d, and the bypass communication passage By opening 144, the intermediate pressure refrigerant passage 15 can be charged with the refrigerant.

  As described above, according to the integrated valve 14 of the present embodiment, various problems associated with the refrigerant filling operation in the heat pump cycle 10 that can be switched to the gas injection cycle are eliminated, and the mountability of the heat pump cycle 10 on an object to be mounted is improved. It becomes possible to improve.

  Here, the integrated valve 14 of this embodiment is bypassed by the force acting on the liquid phase side valve element 181 when the solenoid 182 displaces the liquid phase side valve element 181 to the closed position of the liquid phase refrigerant passage 141d. The valve body 183 is displaced to the closed position of the bypass communication path 144.

  In this way, if the liquid phase side valve body 181 and the bypass valve body 183 are configured to be displaced by the common solenoid 182, the components of the integrated valve 14 can be simplified, and the object to be mounted on the heat pump cycle 10 can be achieved. It becomes possible to improve the mountability to the more effectively.

  Further, in the integrated valve 14 of the present embodiment, when power supply to the solenoid 182 from the outside is stopped, the liquid-phase side valve body 181 is displaced to the closed position of the liquid-phase refrigerant passage 141d, and the bypass communication passage 144 is The structure is open.

  As described above, when the power supply to the solenoid 182 is stopped, if the bypass communication path 144 is opened, the solenoid 182 does not consume power, and the problem during the refrigerant charging operation can be solved. .

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  In the present embodiment, an example in which a dedicated sub solenoid (sub drive mechanism) 185 for displacing the bypass valve body 184 is added to the integrated valve 14 in addition to the solenoid 182 for displacing the liquid phase side valve body 181 will be described. To do.

  As shown in FIGS. 15 to 17, the gas-phase refrigerant passage 142 b of the present embodiment is configured by a part of the first bottomed hole extending perpendicularly to the axial direction of the gas-liquid separation space 141 b in the upper block 142. Yes. In the present embodiment, the opening formed in the side surface of the first bottomed hole constitutes the gas phase side outlet 142a.

  The upper block 142 is formed with a second bottomed hole that is coaxial with the first bottomed hole and that constitutes a housing space 145c that houses the bypass valve body 184 and the like. The bypass valve body 184 is a valve member that opens and closes the bypass communication path 145.

  The bypass communication path 145 of the present embodiment includes the above-described accommodation space 145c, the first communication hole 145a that communicates the upstream passage 142h and the accommodation space 145c, and the second communication path that communicates the downstream passage 142g and the accommodation space 145c. It is comprised by the communication hole 145b. Although not shown, the accommodation space 145c accommodates a spring that applies a load in the direction of opening the bypass valve body 184.

  The bypass valve body 184 is connected to the movable member of the sub solenoid 185. The sub-solenoid 185 of this embodiment is a sub-driving mechanism that generates electromagnetic force by power supply and displaces the movable member, and its operation is controlled by a control voltage output from the air conditioning control device 40.

  In this embodiment, when the air-conditioning control device 40 supplies power to the sub solenoid 185, the bypass valve body 184 is displaced to the closed position where the first communication hole 145a is closed by the electromagnetic force acting on the movable member. Thereby, as shown in FIG. 15, the bypass communication path 145 is closed.

  When the air-conditioning control device 40 stops supplying power to the sub-solenoid 185, electromagnetic force does not act on the movable member, and the bypass valve body 184 is loaded into the first communication hole 145a by the load of the spring housed in the housing space 145c. Displace to open position to open As a result, as shown in FIGS. 16 and 17, the bypass communication path 145 is opened.

  The configuration for opening and closing the bypass communication path 145 such as the bypass valve body 184 and the sub solenoid 185 of the present embodiment constitutes a normally open type electromagnetic valve. The sub solenoid 185 also functions as a closing member that closes the second bottomed hole.

  Other configurations are the same as those of the first embodiment, and the operation of the integrated valve 14 of the present embodiment will be described below. First, the operation of the integrated valve 14 during the refrigerant charging operation will be described. In the refrigerant charging operation of the present embodiment, the bypass opening / closing valve 251 is set to an open state, and the evacuation step and the filling step are performed in a state where the electromagnetic valve 18 and the bypass valve body 184 are set to an open state. .

  As a result, even when the intermediate pressure port 11d of the compressor 11 is closed during the evacuation step, as shown in FIG. 17, the downstream side passage 142g and the intermediate pressure are passed through the bypass communication passage 145. Air or the like existing in the refrigerant passage 15 can be sucked. Further, even when the intermediate pressure refrigerant passage 15 is in a vacuum state (P1≈0) when the filling process is performed, as shown in FIG. The intermediate pressure refrigerant passage 15 can be filled with refrigerant.

  Subsequently, the operation in each operation mode will be described. In the cooling operation mode, the second heating mode, and the dehumidifying heating operation mode, the air-conditioning control device 40 supplies power to the solenoid 182 to displace the liquid-phase side valve element 181 to the open position of the liquid-phase refrigerant passage 141d, and the sub-solenoid. Power is supplied to 185 and the bypass valve body 184 is displaced to the closed position of the bypass communication path 145.

  As a result, the pressure before and after the fixed throttle 17 becomes equal, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is closed as shown in FIG. In the cooling operation mode, the second heating mode, and the dehumidifying heating operation mode, since the bypass communication passage 145 is closed by the bypass valve body 184, the refrigerant flows into the intermediate pressure refrigerant passage 15 through the bypass communication passage 145. There is nothing.

  On the other hand, in the first heating mode, the air conditioning control device 40 stops power supply to the solenoid 182 and the sub solenoid 185, and displaces the liquid-phase side valve body 181 to the closed position of the liquid-phase refrigerant passage 141d, and also bypasses the bypass valve. The body 184 is displaced to the open position of the bypass communication path 145.

  As a result, the pressure before and after the fixed throttle 17 is expanded, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is opened as shown in FIG. In the first heating mode, the gas-phase refrigerant passage 142b is opened regardless of whether the bypass communication passage 145 is opened or closed. Therefore, power is supplied to the sub solenoid 185 so that the bypass valve body 184 is brought into the closed position of the bypass communication passage 145. It may be displaced. However, from the viewpoint of suppressing power consumption, it is desirable to stop power feeding to the sub solenoid 185 and displace the bypass valve body 184 to the open position of the bypass communication path 145.

  Other operations are the same as those in the first embodiment. In the integrated valve 14 of the present embodiment, when the liquid phase side valve body 181 is displaced to the closed position of the liquid phase refrigerant passage 141d by the solenoid 182, the bypass valve body 184 is moved to the open position of the bypass communication passage 145 by the sub solenoid 185. It is set as the structure made to displace.

  According to this, as in the first embodiment, various problems associated with the refrigerant filling operation in the heat pump cycle 10 that can be switched to the gas injection cycle are eliminated, and the mountability of the heat pump cycle 10 on an object to be mounted is improved. It becomes possible.

(Third embodiment)
Next, a third embodiment will be described. In the present embodiment, description of the same or equivalent parts as in the first and second embodiments will be omitted or simplified.

  In the present embodiment, the bypass communication passage 146 that connects the downstream-side passage 142g of the gas-phase refrigerant passage 142b and the liquid-phase refrigerant passage 141d is opened and closed by the bypass valve body 181d that is integrally connected to the liquid-phase side valve body 181. An example will be described.

  As shown in FIGS. 18 to 20, in the liquid phase side valve body 181 of the present embodiment, a bypass valve body 181d is integrally connected to the opposite side of the seal member 181b. And the 1st slot which constitutes a part of liquid phase refrigerant passage 141d is divided into space on the liquid phase refrigerant passage 141d side, and back space 146c on the solenoid 182 side by bypass valve body 181d. The bypass valve body 181d is formed in a cylindrical shape whose outer diameter is slightly smaller than the inner diameter of the first elongated hole, and is slidably supported on the inner wall surface of the first elongated hole.

  The bypass communication path 146 of the present embodiment includes the aforementioned back space 146c, the first communication hole 146a that connects the downstream path 142g and the back space 146c, and the first communication hole 146a that connects the liquid refrigerant path 141d and the back space 146c. 2 communication holes 146b. The first communication hole 146a is formed across the blocks 141 and 142 so that the downstream passage 142g and the back space 146c communicate with each other. The second communication hole 146b is formed in the bypass valve body 181d so that the liquid-phase refrigerant passage 141d and the back space 146c communicate with each other.

  The bypass valve body 181d of the present embodiment closes the bypass communication path 146 when the liquid phase refrigerant passage 141d is opened by the liquid phase side valve body 181 and opens the liquid phase refrigerant passage 141d by the liquid phase side valve body 181. When this is done, the bypass communication path 146 is configured to be opened.

  Specifically, as shown in FIG. 18, the bypass valve body 181d opens to the back space 146c side in the first communication hole 146a when the liquid-phase refrigerant passage 141d is opened by the liquid-phase side valve body 181. Displace to a position to close the opening. Thereby, the bypass communication path 146 is closed.

  Further, as shown in FIGS. 19 and 20, the bypass valve body 181d opens to the back space 146c side in the first communication hole 146a when the liquid-phase refrigerant passage 141d is closed by the liquid-phase side valve body 181. Displace to the position to open the opening. Thereby, the bypass communication path 146 is opened.

  Thus, when the liquid phase side valve element 181 of the present embodiment stops the power supply to the solenoid 182 and displaces the liquid phase side valve element 181 to the closed position of the liquid phase refrigerant passage 141d, The bypass communication path 146 is configured to open by a force acting on the side valve body 181.

  Other configurations are the same as those of the first embodiment, and the operation of the integrated valve 14 of the present embodiment will be described below. First, the operation of the integrated valve 14 during the refrigerant charging operation will be described. In the vacuuming step and the filling step of the refrigerant filling operation, power supply to the solenoid 182 is stopped at least temporarily, and the downstream side passage 142g of the gas-phase refrigerant passage 142b and the liquid phase refrigerant passage 141d are bypassed via the bypass communication passage 146. To communicate.

  As a result, even when the intermediate pressure port 11d of the compressor 11 is closed during the evacuation step, as shown in FIG. 20, the downstream side passage 142g and the intermediate pressure are passed through the bypass communication passage 146. Air or the like existing in the refrigerant passage 15 can be sucked. Further, even when the intermediate pressure refrigerant passage 15 is in a vacuum state (P1≈0) when the filling process is performed, as shown in FIG. 20, the downstream side passage 142g and the downstream side passage 142g The intermediate pressure refrigerant passage 15 can be filled with refrigerant.

  Subsequently, the operation in each operation mode will be described. In the cooling operation mode, the second heating mode, and the dehumidifying heating operation mode, the air-conditioning control device 40 supplies power to the solenoid 182 to displace the liquid-phase side valve element 181 to the open position of the liquid-phase refrigerant passage 141d, and bypass valve The body 181d is displaced to the closed position of the bypass communication path 146.

  As a result, the pressure before and after the fixed throttle 17 becomes equal, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is closed as shown in FIG. In the cooling operation mode, the second heating mode, and the dehumidifying heating operation mode, since the bypass communication passage 146 is closed by the bypass valve body 181d, the refrigerant flows into the intermediate pressure refrigerant passage 15 via the bypass communication passage 146. There is nothing.

  On the other hand, in the first heating mode, the air-conditioning control device 40 stops power supply to the solenoid 182 to displace the liquid-phase side valve body 181 to the closed position of the liquid-phase refrigerant passage 141d and bypass the bypass valve body 181d. The communication path 146 is displaced to the open position.

  As a result, the pressure before and after the fixed throttle 17 is expanded, and the opening / closing mechanism 16 is displaced to a position where the gas-phase refrigerant passage 142b is opened, as shown in FIG.

  Other operations are the same as those in the first embodiment. In the integrated valve 14 of this embodiment, when the liquid phase side valve body 181 is displaced to the closed position of the liquid phase refrigerant passage 141d by the solenoid 182, the bypass valve body 181d is displaced to the open position of the bypass communication passage 146. Yes.

  According to this, as in the first embodiment, various problems associated with the refrigerant filling operation in the heat pump cycle 10 that can be switched to the gas injection cycle are eliminated, and the mountability of the heat pump cycle 10 on an object to be mounted is improved. It becomes possible.

  Here, the integrated valve 14 of the present embodiment is configured to displace the liquid-phase side valve body 181 and the bypass valve body 183 by a common solenoid 182 as in the first embodiment. According to this, the components of the integrated valve 14 can be simplified, and the mountability of the heat pump cycle 10 on the mounting object can be more effectively improved.

  In addition, the integrated valve 14 of the present embodiment is configured such that when the power supply to the solenoid 182 is stopped, the bypass communication path 144 is opened. According to this, the trouble at the time of refrigerant filling work can be solved without consuming electric power by the solenoid 182.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In the above-described embodiments, the example in which the integrated valve 14 of the present invention is applied to the heat pump cycle 10 of the vehicle air conditioner 1 for an electric vehicle has been described, but the present invention is not limited to this. For example, the integrated valve 14 of the present invention may be applied to a heat pump cycle 10 of a vehicle air conditioner where engine waste heat may be insufficient, such as a hybrid vehicle.

  (2) In each of the above-described embodiments, the example in which the integrated valve 14 of the present invention is applied to the heat pump cycle 10 of the vehicle air conditioner 1 has been described. However, the present invention is not limited to this, and for example, a stationary air conditioner or liquid heating You may apply to the heat pump cycles 10, such as an apparatus (for example, water heater).

  (3) In the above-described embodiments, examples in which various operation modes are realized by switching the refrigerant circuit of the heat pump cycle 10 using the expansion valves 13 and 22, the electromagnetic valve 18, the bypass on-off valve 251, and the like will be described. However, it is not limited to this.

  The heat pump cycle 10 may be configured to be able to switch between a gas injection cycle and a normal cycle other than the gas injection cycle. For example, the heat pump cycle 10 may have a configuration in which only the heating operation mode including the first heating mode and the second heating mode can be realized, or a configuration in which only the first heating mode and the cooling operation mode can be realized. It may be. Of course, the provision of various operation modes is effective in that the temperature of the heat exchange target fluid (blast air) can be adjusted appropriately.

  (4) In each of the above-described embodiments, the example in which the high stage side expansion valve 13 is configured by an electric variable throttle mechanism has been described, but the present invention is not limited to this. For example, the high stage side expansion valve 13 may be constituted by a fixed throttle, a bypass passage that bypasses the fixed throttle, and a passage opening / closing valve that opens and closes the bypass passage.

  (5) In each of the above embodiments, the example in which the electromagnetic valve 18 that opens and closes the liquid-phase refrigerant passage 141d is configured by a normally closed type electromagnetic valve has been described, but may be configured by a normally open type electromagnetic valve. . The solenoid valve 18 is constituted by a so-called pilot-type solenoid valve that displaces a small valve body by a solenoid actuator that operates with relatively small electric power and operates a main valve by a pressure difference generated by the small valve body. Also good.

  In the above-described second embodiment, the example in which the bypass valve body 184 and the sub solenoid 185 that open and close the bypass communication path 145 are configured by a normally open type electromagnetic valve has been described. May be.

  (6) In the above-described first and third embodiments, the example in which the liquid-phase side valve body 181 and the bypass valve bodies 183 and 181d are displaced by the common solenoid 182 has been described, but the present invention is not limited to this. For example, as in the second embodiment, a dedicated sub solenoid may be added to displace the bypass valve bodies 183 and 181d.

  (7) In the first and second embodiments described above, the bypass communication paths 144 and 145 have been described as examples of communication paths that connect the upstream path 142h and the downstream path 142g of the gas-phase refrigerant path 142b. It is not limited to this. For example, as in the third embodiment, the bypass communication paths 144 and 145 may be communication paths that connect the downstream-side path 142g of the gas-phase refrigerant path 142b and the liquid-phase refrigerant path 141d.

  (8) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say.

  (9) In each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, the specific number is clearly specified when clearly indicated as essential. It is not limited to the specific number except when limited to.

  (10) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

14 Integrated valve (Integrated valve for heat pump)
140 Body 16 Opening / closing mechanism 161 Main valve body 144-146 Bypass communication path 181 Liquid phase side valve body 181d, 183, 184 Bypass valve body 182 Solenoid (main drive mechanism)
185 Sub solenoid (sub drive mechanism)

Claims (7)

An integrated valve for a heat pump applied to a heat pump cycle that can be switched to a gas injection cycle,
Separation is performed in the refrigerant inlet (141a) through which the refrigerant discharged from the compressor (11) flows, the gas-liquid separation space (141b) that separates the gas and liquid of the refrigerant flowing in from the refrigerant inlet, and the gas-liquid separation space. A body (140) formed with a liquid phase side outlet (141e) for flowing out the liquid refrigerant, and a gas phase outlet (142a) for discharging the vapor refrigerant separated in the gas-liquid separation space; ,
A liquid phase side valve body (181) that is accommodated in the body and opens and closes a liquid phase refrigerant passage (141d) from the gas-liquid separation space to the liquid phase side outlet;
A main drive mechanism (182) for displacing the liquid phase side valve element to an open position for opening the liquid phase refrigerant passage and a closed position for closing the liquid phase refrigerant passage;
A fixed throttle (17) that depressurizes the liquid-phase refrigerant and flows it out to the liquid-phase side outlet when the main drive mechanism displaces the liquid-phase side valve element to the closed position of the liquid-phase refrigerant passage;
An opening and closing mechanism (16) configured to include a main valve body (161) that is accommodated in the body and opens and closes a gas-phase refrigerant passage from the gas-liquid separation space to the gas-phase side outlet;
Among the upstream-side passage (142h) and the liquid-phase refrigerant passage constituting the refrigerant passage on the gas-liquid separation space side in the gas-phase refrigerant passage when the gas-phase refrigerant passage is closed, Open and close the bypass communication passages (144 to 146) for communicating with the downstream passage (142g) constituting the refrigerant passage on the gas phase side outlet side in the gas phase refrigerant passage when the gas phase refrigerant passage is closed. A bypass valve body (181d, 183, 184),
The gas-phase side outlet is connected to an intermediate pressure refrigerant passage (15) that leads to an intermediate pressure port (11d) that merges with the refrigerant in the compression process in the compressor,
A back pressure chamber (142e) into which the pressure of the liquid phase side outlet is introduced is formed in the body,
The main valve body is configured to open and close the gas-phase refrigerant passage by a pressure balance of the pressure of the upstream passage, the pressure of the downstream passage, and the pressure of the back pressure chamber,
The bypass valve element is configured to open the bypass communication path when the main drive mechanism displaces the liquid phase side valve element to the closed position of the liquid phase refrigerant path. Integrated valve for heat pump.   The bypass valve body (181d, 183) is formed by the force acting on the liquid phase side valve body when the main drive mechanism displaces the liquid phase side valve body to the closed position of the liquid phase refrigerant passage. The integrated valve for a heat pump according to claim 1, wherein the bypass communication passage (144, 145) is configured to open. A transmission member (181c) for transmitting the force generated in the main drive mechanism to the liquid phase side valve body;
The integrated valve for a heat pump according to claim 2, wherein the bypass valve body (183) is connected to the transmission member so as to be displaced in conjunction with the liquid phase side valve body.   The integrated valve for a heat pump according to claim 2, wherein the bypass valve body (181d) is connected to the liquid phase side valve body so as to be displaced in conjunction with the liquid phase side valve body.   The main drive mechanism displaces the liquid-phase side valve body to an open position of the liquid-phase refrigerant passage when electric power is supplied from the outside, and causes the liquid-phase side valve body to be moved when electric power supply from the outside is stopped. The heat pump integrated valve according to any one of claims 1 to 4, wherein the integrated valve is configured to be displaced to a closed position of the liquid-phase refrigerant passage. A sub-drive mechanism (185) for displacing the bypass valve body (184) in an open position for opening the bypass communication path and a closed position for closing the bypass communication path;
The sub drive mechanism is configured to displace the bypass valve body to the open position of the bypass communication passage when the main drive mechanism displaces the liquid phase side valve body to the closed position of the liquid phase refrigerant passage. It is comprised, The integrated valve for heat pumps of Claim 1 characterized by the above-mentioned.   The sub-drive mechanism displaces the bypass valve body to the closed position of the bypass communication path when power is supplied from the outside, and the bypass valve body is moved to the bypass communication path when power supply from the outside is stopped. The integrated valve for a heat pump according to claim 6, wherein the integrated valve is configured to be displaced to an open position.

Images