JP3994501B2 - Heat transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a heat transfer device, and particularly relates to an improvement of a heat transfer device that circulates a refrigerant without using a pump.
[0002]
[Prior art]
  Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 9-178217, a heat transfer device has a tank storing liquid refrigerant, and pressurizes the liquid refrigerant in the tank to the main refrigerant circuit by increasing the pressure inside the tank. On the other hand, there is a heat transfer device that enables refrigerant circulation without using a pump by reducing the pressure inside the tank and collecting liquid refrigerant in the main refrigerant circuit in the tank.
[0003]
  Specifically, as shown in FIG. 6, in the heat transfer device, the main refrigerant circuit (b) is provided with a pair of tanks (t1, t2) for storing liquid refrigerant, while the cooling heat exchanger (d) and the heating medium are heated. A driving refrigerant circuit (c) that includes a heat exchanger (e) and constitutes a vapor compression refrigeration cycle is provided. In addition, an indoor heat exchanger (h) and a heat source (a) are connected to the main refrigerant circuit (b). In the driving refrigerant circuit (c), the refrigerant circulates, and in the cooling heat exchanger (d) and the heating heat exchanger (e), the refrigerant in the driving refrigerant circuit (c) and the refrigerant in the main refrigerant circuit (b) Heat exchange is performed with a part. As a result, in the heating heat exchanger (e), the refrigerant in the main refrigerant circuit (b) is heated and evaporated by the refrigerant in the driving refrigerant circuit (c) to generate high pressure. On the other hand, in the cooling heat exchanger (d), a part of the refrigerant in the main refrigerant circuit (b) is cooled and condensed by the refrigerant in the driving refrigerant circuit (c) to generate a low pressure.
[0004]
  Then, the high pressure generated in the heating heat exchanger (e) is applied to the first tank (t1) to pressurize the liquid refrigerant from the tank (t1). At the same time, the low pressure generated in the cooling heat exchanger (d) is applied to the second tank (t2) to reduce the pressure, and the liquid refrigerant is recovered in the tank (t2). Thus, the refrigerant circulation operation in the main refrigerant circuit (b) is obtained. Then, the refrigerant flowing through the main refrigerant circuit (b) conveys the cold or hot heat generated in the heat source (a) to the indoor exchanger, and uses it for indoor air conditioning in the indoor heat exchanger (h). . Further, when the liquid refrigerant in the first tank (t1) runs out, the first tank (t1) is depressurized and at the same time the second tank (t2) is switched to be pressurized, thereby continuously circulating the refrigerant. Like to get.
[0005]
  In the main refrigerant circuit (b), a plurality of check valves (g) are provided in the pipes connected to the lower portions of both tanks (t1, t2). And even when the pressure increase and the pressure reduction to the tanks (t1, t2) are switched by the check valves (g) as described above, the refrigerant flow direction in the main refrigerant circuit (b) does not change. I am doing so.
[0006]
[Problems to be solved by the invention]
  However, in the above conventional heat transfer device, when the liquid refrigerant flowing into the tank (t1, t2) is flushed, the amount of gas processing in the tank (t1, t2) increases, and the inside of the tank (t1, t2) This makes it impossible to reliably reduce the pressure. For this reason, there has been a problem that the amount of refrigerant circulating in the main refrigerant circuit (b) is reduced and the heat transfer capability is lowered.
[0007]
  Specifically, for example, during the heating operation, the liquid refrigerant returns from the indoor heat exchanger (h) to the one tank (t2). However, since the pipe between the indoor heat exchanger (h) and the tank (t2) is a long pipe, this liquid refrigerant may be flushed due to the pressure loss of the pipe and partly vaporize.
[0008]
  The flushed refrigerant flows directly into the tank (t2), and the amount of gas refrigerant in the tank (t2) increases. This gas refrigerant is cooled and condensed in the cooling heat exchanger (d). Therefore, if the amount of gas refrigerant in the tank (t2) increases, the internal pressure of the tank (t2) cannot be sufficiently reduced even if a predetermined amount of refrigerant is condensed in the cooling heat exchanger (d). For this reason, the force for sucking the liquid refrigerant into the tank (t2) is weakened. As a result, the amount of refrigerant circulating in the main refrigerant circuit (b) is reduced, and the heat transfer capability of the apparatus is reduced.
[0009]
  Further, a solenoid valve (f) is provided between each tank (t1, t2) and the cooling heat exchanger (d) in order to control the low pressure supply to the tank (t1, t2). . On the other hand, when the amount of gas refrigerant in the tank (t2) increases as described above, the flow rate of gas refrigerant from the tank (t2) to the cooling heat exchanger (d) increases. Therefore, the pressure loss of the refrigerant in the electromagnetic valve (f) increases, and this also makes it possible to sufficiently reduce the internal pressure of the tank (t2). As a result, the amount of refrigerant circulating in the main refrigerant circuit (b) is reduced, and the heat transfer capability of the apparatus is reduced.
[0010]
  As described above, the main refrigerant circuit (b) is provided with the check valve (g). The flushed refrigerant flows through the check valve (g) and flows into the tank (t2). However, since the refrigerant flowing into the tank (t2) is normally liquid refrigerant, the check valve (g) has a diameter that assumes that liquid refrigerant flows. On the other hand, the flow rate of the refrigerant that has been flushed into the two-phase state is faster than the flow rate of the liquid refrigerant. Therefore, when the flushed refrigerant flows to the check valve (g), the pressure loss of the refrigerant increases. For this reason, even if the inside of the tank (t2) is depressurized by a predetermined amount, a sufficient amount of refrigerant cannot be sucked into the tank (t2). As a result, the amount of refrigerant circulating in the main refrigerant circuit (b) is reduced, and the heat transfer capability is reduced.
[0011]
  In response to this, measures have been taken to increase the diameter of the solenoid valve (f) and check valve (g) to reduce refrigerant pressure loss at the solenoid valve (f) and check valve (g). Was taken. However, in this case, it is necessary to use a larger-diameter solenoid valve (f) or check valve (g), which complicates the circuit of the apparatus and increases the cost.
[0012]
  Furthermore, when the liquid refrigerant flowing into the tank (t1, t2) is flushed, the liquid refrigerant and the gas refrigerant are mixed in the tank (t1, t2), so that the heat transfer capacity is reduced. There was also.
[0013]
  Specifically, in this case, the liquid refrigerant and the gas refrigerant are stored in a mixed state in one tank (t2) for sucking the refrigerant. That is, it is in a state of being bubbled. When a predetermined amount of refrigerant is sucked into the one tank (t2), the state is switched to a state where the refrigerant is pushed out from the tank (t2). At that time, the refrigerant in a state where the liquid refrigerant and the gas refrigerant are mixed with each other flows out. For this reason, the flow rate of the liquid refrigerant flowing out of the tank (t2) for heat transfer is reduced, and the amount of cold or hot heat generated in the heat source (a) to the indoor heat exchanger (h) is reduced. It was.
[0014]
  The present invention has been made in view of the above points, and the object of the present invention is to simplify the circuit by allowing only the liquid refrigerant to be collected in the tank, thereby reducing the cost of the apparatus and performing any operation. It is to enable stable heat transfer operation even in a state.
[0015]
[Means for Solving the Problems]
  The present invention is provided with gas-liquid separation means (1) for separating liquid refrigerant and gas refrigerant, and supplies the liquid refrigerant separated by the gas-liquid separation means (1) to the tank means (T1, T2). It is a thing.
[0016]
  Specifically, the first solution provided by the present invention is that the main liquid pipes (25, 26) and the main gas pipes (the main gas pipes (25) and the main gas pipes ( 27) a use side circuit (B) in which the refrigerant circulates through the heat transfer and heat transfer, and tank means (T1, T2) connected to the main liquid piping (25, 26) of the use side circuit (B). The refrigerant is heated and evaporated, and the refrigerant is cooled and condensed, and the tank means (T1, T2) is pressurized and depressurized to recover the refrigerant from the use side circuit (B) and use side circuit. (B) a pressure-and-pressure-reducing means (35, 36) that pushes out the refrigerant, and a heat-conveying device (C) that generates a driving force for refrigerant circulation in the use side circuit (B). The equipment is assumed. Then, the refrigerant flowing from the use side circuit (B) toward the tank means (T1, T2) is received, the refrigerant is separated into liquid refrigerant and gas refrigerant, and only the liquid refrigerant is supplied to the tank means (T1, T2). The gas-liquid separation means (1) to be supplied to) is provided.
[0017]
  Further, the first solving means is the gas-liquid separating means. (1) And tank means (T1, T2) Control valve that controls the flow direction of refrigerant (CV-5) Connected through the control valve (CV-5) Gas-liquid separation means (1) Only the liquid refrigerant is circulated.
[0018]
  The second solving means adopted by the present invention is the refrigerant in the first solving means in which the gas refrigerant separated by the gas-liquid separating means (1) is condensed and supplied to the tank means (T1, T2). A liquefying means (51) is provided.
[0019]
  Further, the third solving means taken by the present invention is the heating means (35) for generating the high pressure by heating and evaporating the liquid refrigerant in the first solving means. And a cooling section (36) that cools and condenses the gas refrigerant to generate a low pressure, and the cooling section (36) is composed of the gas refrigerant in the transport means (C) and the gas-liquid separation means (1). The separated gas refrigerant is configured to condense.
[0020]
  Further, the fourth solving means adopted by the present invention is that in the third solving means, the heating part (35) of the pressure-increasing / decreasing means (35, 36) is connected to the tank means (T1, T2) with a liquid pipe (34 ) And the gas pipe (31), and configured to perform a pressurizing operation to evaporate liquid refrigerant from the tank means (T1, T2) and supply the gas refrigerant to the tank means (T1, T2). On the other hand, the cooling section (36) of the pressurizing / depressurizing means (35, 36) is connected to the tank means (T1, T2) via the liquid pipe (33) and the gas pipe (32) to condense the gas refrigerant. The tank means (T1, T2) and the gas-liquid separation means (1) are configured to perform a pressure reducing operation for sucking the gas refrigerant.
[0021]
  Further, a fifth solving means provided by the present invention is that, in the third solving means, the tank means (T1, T2) is constituted by two tank members (T1, T2) in which refrigerant is stored, The means (35, 36) includes a heat exchange member (H1, H2) which is configured to be switchable between a heating unit (35) and a cooling unit (36) and is provided in each of the tank members (T1, T2). Then, one of the heat exchange members (H1, H2) is switched to the heating section (35), the refrigerant in the tank members (T1, T2) is evaporated to perform a pressurizing operation, and the other heat exchange member (H1, H2) is While switching to the cooling unit (36) and condensing the refrigerant in the tank members (T1, T2) to perform a pressure reducing operation, the heat exchange members (H1, H2) performing the pressure reducing operation have gas-liquid separation means ( A gas outlet pipe (39) is provided for switching the gas refrigerant of the gas-liquid separation means (1) to the heat exchange members (H1, H2) side so as to condense the gas refrigerant of 1).
[0022]
      -Action-
  In the first solution means, the pressure increasing / decreasing means (35, 36) pressurizes and depressurizes the tank means (T1, T2). As a result, the liquid refrigerant is pushed out and the liquid refrigerant is sucked.
By such pushing operation and suction operation, a driving force for circulating the refrigerant in the use side circuit (B) is generated, and this refrigerant performs the circulating operation. Then, heat of the heat source side heat exchanger (22) is transferred to the use side heat exchanger (21) by this refrigerant circulation. The refrigerant sucked into the tank means (T1, T2) is then pushed out of the tank means (T1, T2) again and flows to the use side circuit (B). Thereby, heat transfer is continuously performed.
[0023]
  On the other hand, the refrigerant flowing from the use side circuit (B) toward the tank means (T1, T2) flows to the gas-liquid separation means (1). The refrigerant is separated into a liquid refrigerant and a gas refrigerant in the gas-liquid separation means (1), and then only the liquid refrigerant is sucked from the gas-liquid separation means (1) to the tank means (T1, T2). .
[0024]
  More,the aboveFirstIn this solution, only the liquid refrigerant separated by the gas-liquid separation means (1) flows into the tank means (T1, T2) through the control valve (CV-5).
[0025]
  In the second solution means, the gas refrigerant separated in the gas-liquid separation means (1) among the refrigerant flowing from the use side circuit (B) toward the tank means (T1, T2) is the refrigerant liquefaction means. (51) The gas refrigerant is condensed by the refrigerant liquefaction means (51).
[0026]
  In the third solution, the liquid refrigerant is evaporated by the heating unit (35) to become a gas refrigerant, and high pressure is generated. Then, this high pressure is applied to the tank means (T1, T2) to pressurize the tank means (T1, T2), and push out the liquid refrigerant from the tank means (T1, T2). At the same time, the gas refrigerant is condensed by the cooling section (36) to become a liquid refrigerant, and a low pressure is generated. Then, this low pressure is applied to the tank means (T1, T2) to depressurize the tank means (T1, T2), and the liquid refrigerant is sucked into the tank means (T1, T2). The cooling section (36) receives the gas refrigerant separated by the gas-liquid separation means (1) and condenses the gas refrigerant.
[0027]
  In the fourth solution, the liquid refrigerant is supplied from the liquid pipe (34) to the heating section (35), and the liquid refrigerant evaporates to generate a high-pressure gas refrigerant. The high-pressure gas refrigerant is supplied to the tank means (T1, T2) through the gas pipe (31) to pressurize the tank means (T1, T2). At the same time, in the cooling section (36), the gas refrigerant condenses to generate a low pressure, and the tank means (T1, T2) is decompressed by sucking the gas refrigerant in the tank means (T1, T2) through the gas pipe (32). . The cooling section (36) sucks the gas refrigerant separated by the gas-liquid separation means (1) and condenses the gas refrigerant. The refrigerant condensed in the cooling section (36) flows from the liquid pipe (33) to the tank means (T1, T2).
[0028]
  In the fifth solution, the one heat exchange member (H1, H2) is switched to the heating section (35), and the tank member (T1, T2) provided with the one heat exchange member (H1, H2) is provided. ) Heat the refrigerant inside. The liquid refrigerant in the tank members (T1, T2) evaporates to generate a high pressure, and the tank members (T1, T2) are pressurized. At the same time, the other heat exchange member (H1, H2) is switched to the cooling section (36) to cool the refrigerant in the tank members (T1, T2) provided with the other heat exchange member (H1, H2). The gas refrigerant in the tank members (T1, T2) is condensed to generate a low pressure, and the tank members (T1, T2) are depressurized. The gas refrigerant separated by the gas-liquid separation means (1) is guided to the heat exchange member (H1, H2) switched to the cooling unit (36) by the gas outlet pipe (39), and the heat exchange member It is cooled and condensed by (H1, H2).
[0029]
【The invention's effect】
  Therefore, according to the above solution, the refrigerant flowing from the use side circuit (B) toward the tank means (T1, T2) is separated into the liquid refrigerant and the gas refrigerant by the gas-liquid separation means (1) and separated. Only the liquid refrigerant thus obtained can be supplied to the tank means (T1, T2). That is, even when a part of the refrigerant is flushed, only the liquid refrigerant can be supplied to the tank means (T1, T2).
[0030]
  Therefore, it is possible to reduce the amount of gas refrigerant condensed in the pressure-increasing / decreasing means (35, 36), and to reduce the flow rate of gas refrigerant from the tank means (T1, T2) to the pressure-increasing / decreasing means (35, 36). be able to. As a result, the circuit between the tank means (T1, T2) and the pressure increasing / decreasing means (35, 36) can be simplified, the refrigerant circuit can be configured at low cost, and the heat transfer operation can be ensured. It can be carried out. In particular, since the gas refrigerant flowing through the gas line between the tank means (T1, T2) and the pressure-increasing / decreasing means (35, 36) is reduced, it is not necessary to increase the aperture of the solenoid valve of the gas line. As a result, the refrigerant circuit can be configured at low cost.
[0031]
  Further, since only the liquid refrigerant can be supplied to the tank means (T1, T2), the liquid refrigerant and the gas refrigerant can be reliably separated in the tank means (T1, T2). Therefore, when the refrigerant sucked into the tank means (T1, T2) is pushed out from the tank means (T1, T2) again, only the liquid refrigerant can be pushed out. As a result, only the liquid refrigerant can be reliably sent to the use side circuit (B), and the cold or warm heat of the heat source side heat exchanger (22) can be reliably transferred to the use side heat exchanger (21). .
[0032]
  More,the aboveFirstAccording to this solution, only the liquid refrigerant separated by the gas-liquid separation means (1) can be circulated to the control valve (CV-5). For this reason, it is possible to prevent an increase in pressure loss in the control valve (CV-5) without increasing the diameter of the control valve (CV-5). As a result, the refrigerant circuit can be configured at low cost.
[0033]
  Also, according to the second solution means, the gas refrigerant separated by the gas-liquid separation means (1) can be condensed by the refrigerant liquefaction means (51), and a reliable operation can be performed. In particular, compared with the case where all the refrigerant returning to the tank means (T1, T2) is cooled to condense the flashed refrigerant, only the gas refrigerant is cooled, so that there is less pressure loss and a smaller refrigerant liquefaction means (51 ) Can be used.
[0034]
  Further, according to the third to fifth solving means, the gas refrigerant separated by the gas-liquid separation means (1) can be condensed by the cooling part (36) of the pressure-increasing and depressurizing means (35, 36). , Reliable operation can be performed.
[0035]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the air conditioner conveys the heat and cold generated by the heat source side circuit (A), which is a heat source, to the indoor heat exchanger (21), which is a use side heat exchanger, for air conditioning. The heat transfer device includes a heat source side circuit (A), a use side circuit (B), a transfer circuit (C), and a drive circuit (D).
[0036]
  First, the transfer circuit (C) applies a transfer force to the use side circuit (B) and is configured as a transfer means. The transfer circuit (C) is filled with a refrigerant, and includes a cooling heat exchanger (36) as a low pressure part, a heating heat exchanger (35) as a high pressure part, a sub tank (ST), And first and second main tanks (T1, T2) as tank means. The cooling heat exchanger (36) and the heating heat exchanger (35) constitute pressure increasing / decreasing means.
[0037]
  A gas supply pipe (31), which is a gas pipe, is connected to the upper end of the heating heat exchanger (35). This gas supply pipe (31) is branched into three branch pipes (31a, 31b, 31c), and each branch pipe (31a-31c) is an upper end portion of each main tank (T1, T2) and sub tank (ST). Are connected individually. These branch pipes (31a to 31c) are provided with first to third tank pressurizing solenoid valves (SV-P1 to SV-P3). In addition, a liquid recovery pipe (34) is connected to the lower end of the heating heat exchanger (35). The liquid recovery pipe (34) is connected to the lower end of the sub tank (ST) to form a liquid pipe. The liquid recovery pipe (34) is provided with a check valve (CV-1) that allows only the refrigerant outflow from the sub tank (ST). Each main tank (T1, T2) is installed at a position lower than the cooling heat exchanger (36). The sub tank (ST) is installed at a position higher than the heating heat exchanger (35).
[0038]
  On the other hand, a gas recovery pipe (32), which is a gas pipe, is connected to the upper end of the cooling heat exchanger (36). The gas recovery pipe (32) is branched into three branch pipes (32a to 32c), and each branch pipe (32a to 32c) is connected to the branch pipe (31a to 31c) of the gas supply pipe (31). Yes. The gas recovery pipe (32) is individually connected to the upper ends of the main tanks (T1, T2) and the sub tanks (ST). These branch pipes (32a to 32c) are provided with first to third tank pressure reducing solenoid valves (SV-V1 to SV-V3). A liquid supply pipe (33), which is a liquid pipe, is connected to the lower end of the cooling heat exchanger (36). The liquid supply pipe (33) is branched into two branch pipes (33a, 33b), and each branch pipe (33a, 33b) is connected to the lower end of each main tank (T1, T2). These branch pipes (33a, 33b) are provided with check valves (CV-2) that allow only the recovery of the refrigerant to the main tanks (T1, T2).
[0039]
  A recovery liquid pipe (38) and an extrusion liquid pipe (37) are connected to each main tank (T1, T2). The recovery liquid pipe (38) is branched into two branch pipes (38a, 38b), and each branch pipe (38a, 38b) is connected to the lower end of each main tank (T1, T2). Each of the branch pipes (38a, 38b) is provided with a check valve (CV-5) that allows only the refrigerant to flow into the main tanks (T1, T2). On the other hand, the extrusion liquid pipe (37) is branched into three branch pipes (37a, 37b, 37c), and each branch pipe (37a-37c) is branched into the branch pipe (38a, 38b) of the recovery liquid pipe (38). ) And the liquid recovery pipe (34), the main tanks (T1, T2) and the sub tanks (ST) are connected to the lower ends of the tanks. Of these branch pipes (37a to 37c), the branch pipes (37a, 37b) connected to the main tanks (T1, T2) are reverse to allow only the refrigerant outflow from the lower ends of the main tanks (T1, T2). While the stop valve (CV-3) is provided, the branch pipe (37c) connected to the sub tank (ST) is provided with a check valve (CV-4) that allows only the refrigerant to flow into the sub tank (ST). Is provided. The check valve (CV-5) provided in the branch pipe (38a, 38b) of the recovery liquid pipe (38) is configured as a control valve for controlling the flow direction of the refrigerant. Further, a heat radiating heat exchanger (42) for exchanging heat with the drive circuit (D) is connected to the extrusion liquid pipe (37).
[0040]
  Next, the use side circuit (B) includes a heat source side heat exchanger (22) that performs heat exchange with the heat source side circuit (A) that is a heat source, an indoor heat exchanger (21), and a use side A refrigerant circuit in which the electric expansion valve (23) is connected by a refrigerant pipe (8). Specifically, the use side electric expansion valve (23) is connected to the liquid side of the indoor heat exchanger (21), while the heat source side heat exchanger (22) is connected to the gas side of the indoor heat exchanger (21). Is connected. Also, one end of the use side electric expansion valve (23) and one end of the heat source side heat exchanger (22) are connected to the recovery liquid pipe of the transfer circuit (C) via the use side four-way switching valve (24). (38) and the extrusion liquid pipe (37). Then, a refrigerant pipe (8) connecting the use side electric expansion valve (23) and the use side four-way switching valve (24), a heat source side heat exchanger (22), a use side four-way switching valve (24), The refrigerant pipe (8) connecting the heat exchanger is configured as the main liquid pipe (25, 26), while the refrigerant pipe (8) connecting the indoor heat exchanger (21) and the heat source side heat exchanger (22) is Consists of main gas pipe (27).
[0041]
  A gas-liquid separator (1) is provided in the recovery liquid pipe (38) between the use side four-way selector valve (24) and the main tank (T1, T2). The gas-liquid separator (1) is a feature of the present invention, and is a separator main body (2) that is a substantially cylindrical container, a refrigerant inlet pipe (3), and a liquid refrigerant outlet pipe (4 ) And a gas refrigerant outlet pipe (5). One end of the refrigerant inlet pipe (3) is connected to the utilization side four-way switching valve (24) via the recovery liquid pipe (38), and the other end is connected to the upper and lower sides of the internal space of the separator body (2). An opening is located near the center of the direction. One end of the liquid refrigerant outlet pipe (4) is connected to the recovery liquid pipe (38) of the transfer circuit (C), and the other end is located at the lower end of the internal space of the separator body (2). Open. One end of the gas refrigerant outlet pipe (5) is connected to the gas return pipe (39), and the other end is opened at an upper end portion in the internal space of the separator body (2). Further, the gas return pipe (39) is connected to the gas recovery pipe (32) of the transfer circuit (C).
[0042]
  The drive circuit (D) is a circuit for heating and cooling the refrigerant in the transfer circuit (C), and is composed of a vapor compression refrigeration cycle. The driving circuit (D) includes a driving compressor (41), a heating heat exchanger (35), a heat radiation heat exchanger (42), a driving electric expansion valve (43), a cooling heat exchanger (36), Are connected in order by a refrigerant pipe (8) to form a closed circuit. In the heating heat exchanger (35) and the cooling heat exchanger (36), the refrigerant in the drive circuit (D) and the refrigerant in the transfer circuit (C) exchange heat. In the heating heat exchanger (35), the refrigerant in the drive circuit (D) is condensed, and the refrigerant in the transfer circuit (C) is heated and evaporated. On the other hand, in the cooling heat exchanger (36), the refrigerant in the drive circuit (D) evaporates, and the refrigerant in the transfer circuit (C) is cooled and condensed. In the heat dissipation heat exchanger (42), heat is exchanged between the refrigerant in the driving circuit (D) and the liquid refrigerant pushed out from the main tanks (T1, T2) of the conveying circuit (C). Then, the excess heat generated in the driving circuit (D) is radiated.
[0043]
  The heat source side circuit (A) includes a heat source side compressor (11), a heat source side four-way switching valve (14), an outdoor heat exchanger (12), a heat source side electric expansion valve (13), and a heat source side heat exchanger ( 22) are sequentially connected by a refrigerant pipe (8) to form a closed circuit of a vapor compression refrigeration cycle. Further, the heat source side four-way switching valve (14) reversibly recirculates the refrigerant in the heat source side circuit (A), and the heat source side heat exchanger (22) generates hot and cold. .
[0044]
      -Driving action-
  Next, the operation during cooling operation will be described. During this operation, first, each electric expansion valve (13, 23, 43) is adjusted to a predetermined opening. Also, the explanation starts from the state that each solenoid valve (SV-P1, SV-V2, SV-P3) is in the following state. The pressurization solenoid valve (SV-P1) of the first main tank (T1), the pressurization solenoid valve (SV-P3) of the sub tank (ST), and the decompression solenoid valve (SV-V2) of the second main tank (T2) It is open. On the other hand, the pressurization solenoid valve (SV-P2) of the second main tank (T2), the decompression solenoid valve (SV-V1) of the first main tank (T1), the decompression solenoid valve (SV-V3) of the sub tank (ST) Is closed. Further, the use side four-way switching valve (24) and the heat source side four-way switching valve (14) are switched as shown by a solid line in FIG.
[0045]
  In this state, in the heat source side circuit (A), the high-temperature and high-pressure gas refrigerant discharged from the heat source side compressor (11) is separated from the outside air by the outdoor heat exchanger (12), as indicated by a dashed line arrow in FIG. Heat exchange to condense. Thereafter, the refrigerant is depressurized by the heat source side electric expansion valve (13) and flows into the heat source side heat exchanger (22), where it evaporates by exchanging heat with the refrigerant in the use side circuit (B). Returning to the heat source side compressor (11), the circulation operation is repeated.
[0046]
  In the driving circuit (D), as indicated by the two-dot chain arrow in FIG. 2, the high-temperature and high-pressure gas refrigerant discharged from the driving compressor (41) flows into the heating heat exchanger (35). . The refrigerant flowing into the heating heat exchanger (35) exchanges heat with the refrigerant in the transfer circuit (C), and a part of the refrigerant is condensed to heat the refrigerant in the transfer circuit (C). After that, the refrigerant partially condensed in the heating heat exchanger (35) flows to the radiant heat exchanger (42) and exchanges heat with the liquid refrigerant flowing from the first main tank (T1) to the use side circuit (B). , Everything condenses. The condensed refrigerant flows into the cooling heat exchanger (36) after being depressurized by the drive electric expansion valve (43). The refrigerant flowing into the cooling heat exchanger (36) exchanges heat with the refrigerant in the conveying circuit (C) and evaporates to cool the refrigerant in the conveying circuit (C). Thereafter, the evaporated refrigerant is sucked into the drive compressor (41), and such a circulation operation is repeated.
[0047]
  In the transfer circuit (C), the refrigerant in the transfer circuit (C) evaporates in the heating heat exchanger (35) to generate high pressure. This high pressure is supplied to the first main tank (T1) through the branch pipe (31a) of the gas supply pipe (31), and the first main tank (T1) is pressurized. For this reason, the liquid refrigerant stored in the first main tank (T1) is pushed out of the first main tank (T1) as indicated by the solid line arrow in FIG. Then, the refrigerant pushed out of the first main tank (T1) is controlled in flow direction by the check valves (CV-3, CV-5) and flows into the extrusion liquid pipe (37). Furthermore, the refrigerant that has flowed into the extrusion liquid pipe (37) exchanges heat with the refrigerant in the drive circuit (D) in the radiant heat exchanger (42), thereby condensing the refrigerant in the drive circuit (D).
[0048]
  In the cooling heat exchanger (36), the refrigerant in the transfer circuit (C) is condensed to generate a low pressure. This low pressure is supplied to the second main tank (T2) through the branch pipe (32b) of the gas recovery pipe (32), and the second main tank (T2) is depressurized. Further, the flow direction of the refrigerant in the recovery liquid pipe (38) is controlled by the check valves (CV-3, CV-5). For this reason, the liquid refrigerant separated by the gas-liquid separator (1) is sucked from the liquid refrigerant outlet pipe (4) into the recovery liquid pipe (38), and as shown by the solid line arrow in FIG. 2 Collected in main tank (T2).
[0049]
  The gas refrigerant separated by the gas-liquid separator (1) flows from the gas refrigerant outlet pipe (5) through the gas return pipe (39) and into the gas recovery pipe (32). Then, the gas flows from the gas recovery pipe (32) to the cooling heat exchanger (36) and exchanges heat with the refrigerant in the driving circuit (D) to condense.
[0050]
  On the other hand, in the use side circuit (B), the refrigerant that has been pushed out of the first main tank (T1) and has flowed through the extrusion liquid pipe (37) passes through the use side four-way switching valve (24) to the main liquid pipe (25 ) The refrigerant flowing through the main liquid pipe (25) passes through the use-side electric expansion valve (23), and then exchanges heat with indoor air in the indoor heat exchanger (21), and evaporates to cool the indoor air. The refrigerant evaporated in the indoor heat exchanger (21) flows through the main gas pipe (27), condenses in the heat source side heat exchanger (22), and then flows through the main liquid pipe (26), thereby It flows into the gas-liquid separator (1) through the switching valve (24). The refrigerant flowing into the gas-liquid separator (1) is separated into a liquid refrigerant and a gas refrigerant, and this liquid refrigerant flows through the collection liquid pipe (38) and is collected in the second main tank (T2).
[0051]
  Here, the operation of the gas-liquid separator (1) will be described. The refrigerant that has flowed through the use side circuit (B) flows from the refrigerant inlet pipe (3) into the separator main body (2). Then, only the liquid refrigerant out of the refrigerant flowing into the separator body (2) is accumulated in the lower part of the separator body (2), and the liquid refrigerant and the gas refrigerant are separated in the separator body (2). Become. In this state, the liquid refrigerant accumulated in the lower part of the separator body (2) passes through the recovery liquid pipe (38) from the liquid refrigerant outlet pipe (4) opened at the lower end of the internal space of the separator body (2). After that, it is recovered to the second main tank (T2). On the other hand, the gas refrigerant inside the separator body (2) flows from the gas refrigerant outlet pipe (5) opening at the upper end of the internal space of the separator body (2) through the gas return pipe (39) to the cooling heat exchanger. Flows into (36).
[0052]
  In the transfer circuit (C), the sub tank (ST) is pressure-equalized with the heating heat exchanger (35). For this reason, as indicated by solid arrows in FIG. 2, the liquid refrigerant in the sub tank (ST) is supplied to the heating heat exchanger (35) via the liquid recovery pipe (34). The supplied liquid refrigerant evaporates in the heating heat exchanger (35) and contributes to pressurization in the first main tank (T1). Thereafter, when most of the liquid refrigerant in the sub-tank (ST) is supplied to the heating heat exchanger (35), the pressurization solenoid valve (SV-P3) of the sub-tank (ST) is closed and the sub-tank (ST ) The pressure reducing solenoid valve (SV-V3) is opened. As a result, the pressure in the sub tank (ST) becomes low, and a part of the refrigerant flowing through the extrusion liquid pipe (37) is recovered as shown by the broken arrow in FIG.
[0053]
  After performing such an operation for a predetermined time, the solenoid valves (SV-P1, SV-P2,...) Of the transfer circuit (C) are switched. That is, pressurization solenoid valve (SV-P1) of the first main tank (T1), decompression solenoid valve (SV-V2) of the second main tank (T2), decompression solenoid valve (SV-V3) of the sub tank (ST) Close. Pressurize solenoid valve (SV-P2) of the second main tank (T2), decompression solenoid valve (SV-V1) of the first main tank (T1), pressurization solenoid valve (SV-P3) of the sub tank (ST) Open.
[0054]
  As a result, the internal pressure of the first main tank (T1) becomes low, and conversely, the internal pressure of the second main tank (T2) and the sub tank (ST) becomes high. For this reason, the liquid refrigerant pushed out from the second main tank (T2) circulates in the same manner as described above and enters a refrigerant circulation state in which the liquid refrigerant is collected in the first main tank (T1), and the liquid refrigerant in the sub tank (ST) Is supplied to the heating heat exchanger (35). Also in this case, when most of the liquid refrigerant in the sub tank (ST) is supplied to the heating heat exchanger (35), the pressurization solenoid valve (SV-P3) of the sub tank (ST) is closed, The decompression solenoid valve (SV-V3) of the sub tank (ST) is opened, and the refrigerant is collected into the sub tank (ST).
[0055]
  As described above, each solenoid valve (SV-P1, SV-P2,...) Performs a switching operation, and the refrigerant is pushed out from the first main tank (T1) and recovered into the second main tank (T2). The operation in which the refrigerant is pushed out from the second main tank (T2) and collected in the second main tank (T2) is alternately performed. In the use side circuit (B), the refrigerant circulates and the room is cooled.
[0056]
  Next, the operation operation at the time of heating operation will be described. During this operation, first, the use side four-way switching valve (24) and the heat source side four-way switching valve (14) are switched as shown by broken lines in FIG. 1 and the other electric expansion valves (13, 23, 43). ) And solenoid valves (SV-P1, SV-P2, ...) are operated in the same way as during cooling operation.
[0057]
  In this state, the transfer circuit (C) and the drive circuit (D) operate in the same manner as in the cooling operation.
[0058]
  In the heat source side circuit (A), the high-temperature and high-pressure gas refrigerant discharged from the heat source side compressor (11) exchanges heat with the refrigerant in the use side circuit (B) in the heat source side heat exchanger (22). Condensate. Thereafter, the refrigerant is depressurized by the heat source side electric expansion valve (13) and flows into the outdoor heat exchanger (12), where the refrigerant exchanges heat with the outside air and evaporates to the heat source side compressor (11). Return and repeat this kind of circulation.
[0059]
  On the other hand, in the use side circuit (B), the refrigerant that has been pushed out of the first main tank (T1) and has flowed through the liquid pipe for extrusion (37) passes through the use side four-way switching valve (24) to the main liquid pipe (26 ) The refrigerant flowing through the main liquid pipe (26) is heated and evaporated by the heat source side heat exchanger (22). The evaporated refrigerant flows into the indoor heat exchanger (21), condenses, and heats the indoor air. The condensed refrigerant flows through the main liquid pipe (25), and flows into the gas-liquid separator (1) through the use side four-way switching valve (24). The refrigerant flowing into the gas-liquid separator (1) is separated into a liquid refrigerant and a gas refrigerant, and this liquid refrigerant flows through the collection liquid pipe (38) and is collected in the second main tank (T2).
[0060]
      -Effect of Embodiment 1-
  According to the first embodiment, the refrigerant flowing from the use side circuit (B) toward the main tank (T1, T2) is separated into the liquid refrigerant and the gas refrigerant by the gas-liquid separator (1) and separated. Only the liquid refrigerant can be supplied to the main tanks (T1, T2). That is, even when a part of the refrigerant is flushed, only the liquid refrigerant can be supplied to the main tanks (T1, T2). Therefore, it is possible to reduce the amount of the gas refrigerant to be processed in the cooling heat exchanger (36), and it is possible to reduce the flow rate of the gas refrigerant from the main tank (T1, T2) to the cooling heat exchanger (36). . That is, the flow rate of the gas refrigerant flowing through the branch pipes (32a, 32b) of the gas recovery pipe (32) connected to the main tanks (T1, T2) can be reduced. As a result, the pressure loss of the solenoid valve (SV-V1, SV-V2) can be reduced without increasing the diameter of the solenoid valve (SV-V1, SV-V2) provided in the branch pipe (32a, 32b). The increase can be prevented, and the conveying circuit (C) can be constructed at low cost.
[0061]
  Further, only the liquid refrigerant separated by the gas-liquid separator (1) can be circulated to the check valve (CV-5) of the recovery liquid pipe (38), and the check valve (CV-5) It is possible to prevent an increase in pressure loss at the check valve (CV-5) without increasing the diameter of the valve. As a result, the transfer circuit (C) can be configured at low cost.
[0062]
  Further, since only the liquid refrigerant can be supplied to the main tank (T1, T2), the liquid refrigerant and the gas refrigerant can be reliably separated in the main tank (T1, T2). For this reason, when the refrigerant sucked into the main tanks (T1, T2) is pushed out from the main tanks (T1, T2) again, only the liquid refrigerant can be pushed out. As a result, only the liquid refrigerant can be reliably sent to the use side circuit (B), and the heat of the heat source side heat exchanger (22) can be transferred.IndoorIt can be reliably transported to the heat exchanger (21) for indoor air conditioning.
[0063]
  Further, the gas refrigerant separated by the gas-liquid separator (1) can be condensed by the cooling heat exchanger (36). For this reason, it is not necessary to provide a separate heat exchanger or the like for condensing the gas refrigerant, and as a result, complication of the refrigerant circuit can be avoided.
[0064]
Second Embodiment of the Invention
  Embodiment 2 of the present invention is shown in FIG. 3 instead of Embodiment 1 in which the gas refrigerant separated by the gas-liquid separator (1) is condensed by the cooling heat exchanger (36). As described above, a condensing heat exchanger (51) as a refrigerant liquefying means is provided. The condensing heat exchanger (51) condenses the gas refrigerant separated in the gas-liquid separator (1) in the condensing heat exchanger (51). Other configurations are the same as those of the first embodiment.
[0065]
  The condensing heat exchanger (51) is connected between the driving compressor (41) and the cooling heat exchanger (36), and the radiating heat exchanger (42) and the driving electric expansion valve (43 And a condensing electric expansion valve (52). Specifically, the condensing heat exchanger (51) is connected between the driving compressor (41) of the driving circuit (D) and the cooling heat exchanger (36), and the driving circuit (D ) And a drive electric expansion valve (43) through a condensing electric expansion valve (52). The condensation heat exchanger (51) is connected to the gas refrigerant outlet pipe (5) of the gas-liquid separator (1) and to the liquid supply pipe (33) of the transfer circuit (C). ing. The refrigerant in the transfer circuit (C) and the gas refrigerant separated in the gas-liquid separator (1) are configured to exchange heat in the condensation heat exchanger (51).
[0066]
      -Driving action-
  The air conditioner of the present embodiment operates in the same manner as the air conditioning of the first embodiment, except for the operation of condensing the gas refrigerant separated by the gas-liquid separator (1).
[0067]
  First, in the driving circuit (D), the liquid refrigerant condensed in the heating heat exchanger (35) and the heat radiation heat exchanger (42) is converted into the driving electric expansion valve (43), the condensing electric expansion valve (52), and the like. Branch and flow. The liquid refrigerant flowing to the drive electric expansion valve (43) evaporates in the cooling heat exchanger (36) as in the first embodiment. On the other hand, the liquid refrigerant that has flowed to the condensing electric expansion valve (52) is decompressed by the condensing electric expansion valve (52) and then flows to the condensing heat exchanger (51). The decompressed liquid refrigerant evaporates in the condensation heat exchanger (51), and condenses the gas refrigerant separated in the gas-liquid separator (1). The refrigerant evaporated in the condensing heat exchanger (51) merges with the refrigerant evaporated in the cooling heat exchanger (36), and then sucked into the driving compressor (41).
[0068]
  On the other hand, the gas refrigerant separated by the gas-liquid separator (1) flows through the gas refrigerant outlet pipe (5) and flows into the heat exchanger for condensation (51). The gas refrigerant flowing into the condensing heat exchanger (51) is condensed by heat exchange with the refrigerant in the driving circuit (D). The condensed refrigerant flows into the liquid supply pipe (33) of the transfer circuit (C).
[0069]
      -Effect of Embodiment 2-
  According to the second embodiment, similarly to the first embodiment, even when the refrigerant flowing from the use side circuit (B) toward the main tank (T1, T2) is flushed, the cooling heat exchanger The amount of the gas refrigerant processed in (36) can be reduced. For this reason, the flow rate of the gas refrigerant flowing through the branch pipes (32a, 32b) of the gas recovery pipe (32) connected to the main tank (T1, T2) can be reduced. As a result, it is not necessary to increase the diameter of the solenoid valves (SV-V1, SV-V2) provided in the branch pipes (32a, 32b), and the conveying circuit (C) can be configured at low cost.
[0070]
  Similarly to the first embodiment, only the liquid refrigerant separated by the gas-liquid separator (1) can be circulated through the check valve (CV-5) of the recovery liquid pipe (38). There is no need to increase the diameter of the check valve (CV-5), and the conveying circuit (C) can be configured at low cost.
[0071]
  Further, the gas refrigerant separated by the gas-liquid separator (1) can be condensed by the condensation heat exchanger (51), and a reliable operation can be performed. In particular, compared to the case where all the refrigerant returning to the main tanks (T1, T2) is cooled and the flashed refrigerant is condensed, only the gas refrigerant is cooled, so there is less pressure loss and a more compact heat exchanger for condensation. (51) can be used.
[0072]
  Further, since only the liquid refrigerant can be supplied to the main tank (T1, T2), the liquid refrigerant and the gas refrigerant can be reliably separated in the main tank (T1, T2). As a result, as in the first embodiment, only the liquid refrigerant can be reliably sent to the use side circuit (B), and the heat of the heat source side heat exchanger (22) can be transferred.IndoorIt can be reliably transported to the heat exchanger (21) for indoor air conditioning.
[0073]
  Further, the condensation of the gas refrigerant separated by the gas-liquid separator (1) can be performed in the heat exchanger for condensation (51). Therefore, it is not necessary to condense the gas refrigerant in the cooling heat exchanger (36) of the transfer circuit (C), and as a result, the cooling heat exchanger (36) can be optimized and the circuit configuration can be improved. It can be simplified.
[0074]
Embodiment 3 of the Invention
  The third embodiment of the present invention differs from the first embodiment in the following points.
[0075]
  That is, in the first embodiment, the heating heat exchanger (35) and the cooling heat exchanger (36) of the driving circuit (D), and the first and second main tanks (T1, T2) which are tank members of the tank means ) Are connected by a gas pipe (31, 32) and a liquid pipe (33, 34), and a high pressure generated by the heating heat exchanger (35) and a low pressure generated by the cooling heat exchanger (36) are the first. The first and second main tanks (T1, T2) are pressurized and depressurized by supplying them to the second main tanks (T1, T2).
[0076]
  On the other hand, in the third embodiment, as shown in FIG. 4, heat exchange members (H1, H2) of the driving circuit (D) are provided integrally with the main tanks (T1, T2). Then, the refrigerant inside the first and second main tanks (T1, T2) is heated or cooled to evaporate or condense, and the first and second main tanks (T1, T2) are pressurized or depressurized. .
[0077]
  Accordingly, in the transfer circuit (C) of this embodiment, unlike the first embodiment, the sub-tank (ST) for supplying the liquid refrigerant to the heating heat exchanger (35) is not required, and both main tanks are used. The gas pipes (31, 32) and liquid pipes (33, 34) connected to (T1, T2) and the sub tank (ST) become unnecessary. Other configurations are the same as those of the transfer circuit (C) of the first embodiment. The configurations of the use side circuit (B) and the heat source side circuit (A) are the same as those in the first embodiment.
[0078]
  The drive circuit (D) includes a drive compressor (41), a drive four-way switching valve (44), a first heat exchange section (H1), a drive expansion valve (43), and a second heat exchange section ( H2) are connected in order by refrigerant pipes to form a vapor compression refrigeration cycle. Then, by switching the drive four-way switching valve (44), the first and second heat exchange members (H1, H2) are connected to an evaporator serving as a cooling unit (36) and a condenser serving as a heating unit (35). Can be switched to each other.
[0079]
  The first and second heat exchange members (H1, H2) are each provided with a refrigerant condensing part (C1, C2), and a first refrigerant condensing part (H1) is provided on the first heat exchanging part (H1). C1) and a second refrigerant condensing part (C2) provided on the second heat exchange member (H2).
[0080]
  The upper ends of the refrigerant condensing parts (C1, C2) are connected to the gas refrigerant outlet pipe (5) of the gas-liquid separating means (1) via the gas outlet pipe (61). Each gas outlet pipe (61) is provided with a check valve (CV-6) that allows only the flow of refrigerant from the gas-liquid separation means (1) to each refrigerant condensing section (C1, C2). Yes.
[0081]
  On the other hand, the lower end of the first refrigerant condensing part (C1) is connected to the lower end of the first main tank (T1) by being connected to the branch pipe (38a) of the recovery liquid pipe by the refrigerant pipe. The lower end of the second refrigerant condensing part (C2) is connected to the lower end part of the second main tank (T2) by being connected to the branch pipe (38b) of the recovery liquid pipe by the refrigerant pipe. Furthermore, the refrigerant pipe connecting the lower end of each refrigerant condensing part (C1, C2) and each branch pipe (38a, 38b) of the recovery liquid pipe is connected to the recovery liquid pipe from the refrigerant condensing part (C1, C2). A check valve (CV-7) that allows only the flow of the refrigerant toward the branch pipes (38a, 38b) is provided.
[0082]
      -Driving action-
  Next, the driving operation will be described. The operations of the use side circuit (B) and the heat source side circuit (A) during the cooling operation and the heating operation are the same as those in the first embodiment. Therefore, here, the operation of circulating the refrigerant to the use side circuit (B) by the transfer circuit (C) and the drive circuit (D) will be described.
[0083]
  First, in the driving circuit (D), the driving four-way switching valve (44) is switched as shown by a solid line in FIG. In this state, the high-temperature and high-pressure gas refrigerant discharged from the driving compressor (41) condenses in the first heat exchange member (H1) and heats the refrigerant in the first main tank (T1). That is, the first heat exchange member (H1) serves as a condenser and acts as a heating section (36). The refrigerant condensed in the first heat exchange member (H1) is reduced in pressure by the drive expansion valve (43) to become a low-pressure liquid refrigerant. This low-pressure liquid refrigerant evaporates in the second heat exchange member (H2) and cools the refrigerant in the second main tank (T2). That is, the second heat exchange member (H2) serves as an evaporator and acts as a cooling unit (35). The refrigerant evaporated in the second heat exchange member (H2) is sucked into the driving compressor (41) and repeats this circulation.
[0084]
  Next, in the transfer circuit (C), the refrigerant in the first main tank (T1) is heated and evaporated, and the first main tank (T1) is pressurized. For this reason, the liquid refrigerant stored in the first main tank (T1) is pushed out, and this liquid refrigerant flows to the use side circuit (B) through the extrusion liquid pipe (37). At the same time, the refrigerant in the second main tank (T2) is cooled and condensed, and the second main tank (T2) is depressurized. For this reason, the liquid refrigerant is recovered from the use side circuit (B) to the second main tank (T2) through the recovery liquid pipe (38).
[0085]
  On the other hand, the gas refrigerant separated by the gas-liquid separation means (1) flows to the second refrigerant condensing part (C2) through the gas outlet pipe (61). That is, since the gas lead-out pipe (61) is provided with the check valve (CV-6), the gas refrigerant is used as the low-temperature second heat exchange member serving as an evaporator in the drive circuit (D). It flows to the second refrigerant condensing part (C2) provided in (H2). Then, it is cooled and condensed in the second refrigerant condensing part (C2). The refrigerant condensed in the second refrigerant condensing part (C2) is recovered to the second main tank (T2) through the branch pipe (38b) of the recovery liquid pipe.
[0086]
  After performing such an operation for a predetermined time, the drive four-way selector valve (44) is switched as shown by a broken line in FIG. In this state, in the transfer circuit (C), the second heat exchange member (H2) becomes a condenser, and the first heat exchange member (H1) becomes an evaporator. That is, the second heat exchange member (H2) becomes a heating part (36), and the first heat exchange member (H1) becomes a cooling part (35). Therefore, contrary to the above case, the first main tank (T1) is depressurized and the second main tank (T2) is pressurized at the same time. Accordingly, the liquid refrigerant in the second main tank (T2) is pushed out to the use side circuit (B), and the liquid refrigerant in the use side circuit (B) is recovered into the first main tank (T1). On the other hand, the gas refrigerant separated by the gas-liquid separation means (1) flows to the first refrigerant condensing part (C1) and condenses.
[0087]
  Then, as described above, the four-way switching valve (44) for driving is switched to push out and collect the liquid refrigerant from each main tank (T1, T2) alternately. As a result, the refrigerant continuously circulates in the use side circuit (B), and cold or warm heat is transferred from the heat source side heat exchanger (22) to the indoor heat exchanger (21), thereby performing indoor cooling or heating. Is called.
[0088]
Embodiment 4 of the Invention
  In Embodiment 4 of the present invention, in Embodiment 3 described above, each heat exchange member (H1, H2) is provided with a refrigerant condensing part (C1, C2), and the refrigerant condensing part (C1, C2) and gas-liquid separating means ( 1) is connected to the gas outlet pipe (61), as shown in FIG. 5, the two main tanks (T1, T2) and the gas-liquid separation means (1) are connected to the gas outlet pipe (61). ) To connect. Other configurations are the same as those of the third embodiment.
[0089]
  Specifically, the gas lead-out pipe (61) has one end connected to the gas lead-out pipe (61) with the gas-liquid separation means (1), while the other end branches into two branch pipes. It is connected to the upper end of T1, T2). Each branch pipe of the gas outlet pipe (61) is provided with a check valve (CV-8) that allows only the flow of refrigerant from the gas-liquid separation means (1) to the main tank (T1, T2). It has been.
[0090]
      -Driving action-
  The operation of the air conditioner of the present embodiment is almost the same as that of the third embodiment, and only the operation for condensing the gas refrigerant separated by the gas-liquid separation means (1) is different. Hereinafter, the operation of condensing the gas refrigerant will be described.
[0091]
  The gas refrigerant separated by the gas-liquid separation means (1) flows through the gas outlet pipe (61). This gas refrigerant flows toward one main tank (T1, T2) whose internal pressure is reduced by the action of the check valve (CV-8), and flows into the one main tank (T1, T2). . The gas refrigerant flowing into the main tanks (T1, T2) is cooled and condensed together with the gas refrigerant inside the main tanks (T1, T2).
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram of an air conditioner according to Embodiment 1. FIG.
2 is a refrigerant circuit diagram illustrating a refrigerant circulation operation of the air-conditioning apparatus according to Embodiment 1. FIG.
FIG. 3 is a refrigerant circuit diagram of the air-conditioning apparatus of Embodiment 2.
4 is a refrigerant circuit diagram of the air-conditioning apparatus of Embodiment 3. FIG.
FIG. 5 is a refrigerant circuit diagram of the air-conditioning apparatus of Embodiment 4.
FIG. 6 is a refrigerant circuit diagram of an air conditioner using a conventional heat transfer device.
[Explanation of symbols]
  (A) Heat source side circuit
  (B) User side circuit
  (C) Transport circuit (transport means)
  (D) Drive circuit
  (T1) First main tank (tank member, tank means)
  (T2) Second main tank (tank member, tank means)
  (H1) First heat exchange member
  (H2) Second heat exchange member
  (1) Gas-liquid separator (gas-liquid separation means)
  (21) Indoor heat exchanger (use side heat exchanger)
  (22) Heat source side heat exchanger
  (25) Main liquid piping
  (26) Main liquid piping
  (27) Main gas piping
  (31) Gas supply pipe (gas pipe)
  (32) Gas recovery pipe (gas pipe)
  (33) Liquid supply pipe (Liquid pipe)
  (34) Liquid recovery pipe (Liquid pipe)
  (35) Heating heat exchanger (heating unit, pressure increasing / decreasing means)
  (36) Cooling heat exchanger (cooling section, pressure increasing / decreasing means)
  (51) Heat exchanger for condensation (refrigerant liquefaction means)
  (61) Gas outlet pipe
  (CV-5) Check valve (control valve)

Claims (5)

Use side where the refrigerant circulates between the heat source side heat exchanger (22) and the use side heat exchanger (21) through the main liquid pipes (25, 26) and the main gas pipe (27) to transfer heat. Circuit (B),
Tank means (T1, T2) connected to the main liquid pipe (25, 26) of the use side circuit (B), and the refrigerant is heated and evaporated, and the refrigerant is cooled and condensed, and the tank means ( Pressurizing and depressurizing (T1, T2) to recover the refrigerant from the use side circuit (B) and push out the refrigerant to the use side circuit (B) (35, 36) A heat transfer device comprising a transfer means (C) for generating a driving force for refrigerant circulation of the use side circuit (B),
The refrigerant flowing from the use side circuit (B) toward the tank means (T1, T2) is received, the refrigerant is separated into liquid refrigerant and gas refrigerant, and only the liquid refrigerant is sent to the tank means (T1, T2). while Ru provided with a gas-liquid separating means (1) for supplying,
The gas-liquid separation means (1) and the tank means (T1, T2) are connected via a control valve (CV-5) that controls the flow direction of the refrigerant , and the control valve (CV-5) is separated from the gas-liquid. A heat transfer device characterized in that only the liquid refrigerant of the means (1) flows . The heat transfer device according to claim 1,
A heat transfer device comprising refrigerant liquefaction means (51) for condensing the gas refrigerant separated by the gas-liquid separation means (1) and supplying the condensed refrigerant to the tank means (T1, T2). The heat transfer device according to claim 1,
The pressure-increasing / decreasing means (35, 36) includes a heating unit (35) that heats and evaporates the liquid refrigerant to generate high pressure, and a cooling unit (36) that cools and condenses the gas refrigerant to generate low pressure. Prepared,
The cooling unit (36) is configured to condense the gas refrigerant of the conveying means (C) and the gas refrigerant separated by the gas-liquid separating means (1). The heat transfer device according to claim 3, wherein
The heating section (35) of the pressure increasing / decreasing means (35, 36) is connected to the tank means (T1, T2) via the liquid pipe (34) and the gas pipe (31), and from the tank means (T1, T2). While being configured to perform a pressurizing operation for evaporating the liquid refrigerant and supplying gas refrigerant to the tank means (T1, T2),
The cooling section (36) of the pressure increasing / decreasing means (35, 36) is connected to the tank means (T1, T2) via the liquid pipe (33) and the gas pipe (32), and condenses the gas refrigerant so as to condense the tank means ( A heat transfer device configured to perform a pressure reduction operation for sucking the gas refrigerant of T1, T2) and the gas-liquid separation means (1). The heat transfer device according to claim 3, wherein
The tank means (T1, T2) consists of two tank members (T1, T2) that store the refrigerant,
The pressure increasing / decreasing means (35, 36) is configured to be switchable between a heating part (35) and a cooling part (36), and is provided in each of the tank members (T1, T2). One of the heat exchange members (H1, H2) is switched to the heating section (35) to evaporate the refrigerant in the tank members (T1, T2) and perform a pressurizing operation, and the other heat exchange member (H1, H2) ) Is switched to the cooling section (36) to condense the refrigerant in the tank members (T1, T2) and perform a pressure reducing operation,
The gas refrigerant in the gas-liquid separation means (1) is condensed in each heat exchange member (H1, H2) so that the gas refrigerant in the gas-liquid separation means (1) condenses in the heat exchange member (H1, H2) that performs the pressure reducing operation. A heat transfer device, characterized in that a gas lead-out pipe (39) for switching to the side is provided.

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