JP2000213821A - Heat carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the performance of a heat carrier by switching a main switching means every specified period equal to the period for repeating saturated state and empty state during maximum capacity operation through a tank having smaller capacity out of first and second tanks. SOLUTION: The main switch control section 31 of a controller 30 switches a main switching mechanism M1 comprising first pressure solenoid valve 111, a second pressure solenoid valve 112, an auxiliary pressure solenoid valve 113, and a first reducing solenoid valve 114 every specified period equal to the period for repeating saturated state and empty state during maximum capacity operation through a tank having smaller capacity out of first and second tanks 141, 142. A controller 30 prestores the specified period in an incorporated memory and executes switching control with reference to an incorporated time. According to the arrangement, performance of a heat carrier can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device which can be used as a refrigerant circuit or the like of an air conditioner, and more particularly to a method for obtaining a driving force for transferring a refrigerant by heating and cooling the refrigerant in the refrigerant circuit. Related to the device.

[0002]

2. Description of the Related Art Conventionally, as a refrigerant circuit of an air conditioner, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-180022, a driving force for circulation of the refrigerant is obtained by heating and cooling the refrigerant. A heat transfer device adapted to obtain the same is known.

[0003] This heat transfer device is constructed by sequentially connecting a heater, a condenser and a tank via a refrigerant pipe.
The tank is arranged at a position higher than the heater, and the heater and the tank are connected via a pressure equalizing pipe provided with an on-off valve.

With such a configuration, during indoor heating operation, the on-off valve is first closed, and the gas refrigerant heated by the heater is condensed and liquefied by the condenser. To be collected. After that, the on-off valve is opened, and the pressure of the heater and the tank is equalized by the pressure equalizing pipe, thereby returning the liquid refrigerant from the tank located at a position higher than the heater to the heater. Then, the refrigerant is circulated by repeating such an operation.

However, in such a configuration, when gas refrigerant is introduced into the tank from the condenser, the pressure in the tank increases, and there is a possibility that a good refrigerant circulation operation may not be performed. For this reason, it is necessary to keep the refrigerant in a supercooled state in the condenser so that the gas refrigerant does not flow out of the condenser, and it has been difficult to apply the refrigerant to a large-scale system or a long piping system.

In order to solve these problems, the heat transfer device disclosed in Japanese Patent Application Laid-Open No. 9-178217 can switch between a pressurizing operation and a depressurizing operation for a tank storing a liquid refrigerant. A driving force generation circuit is provided, and the liquid refrigerant in the tank is pushed out to the use side circuit by a pressurizing operation, and the liquid refrigerant in the use side circuit is recovered to the tank by a depressurizing operation, thereby improving the refrigerant circulation.

More specifically, as shown in FIG. 8, the heat transfer device comprises a primary circuit (y1) comprising a vapor compression type refrigerant circuit provided with a compressor (a), and a heat driven type refrigerant circuit. Consisting of a circuit 2
And a secondary circuit (y2). The primary side circuit (y1) is composed of a drive source circuit (x4) equipped with a pressurizing heat exchanger (b) and a decompressing heat exchanger (d) for driving, a heat source side heat exchanger (g) and a main heat source. And a heat source side circuit (x2) including an exchanger (f). The secondary side circuit (y2) includes a utilization side heat exchanger (e) and is connected to the main heat exchanger (f) to circulate the secondary side refrigerant (x).
1), and a driving force generating circuit (x3) that includes a pair of tanks (t1) and (t2) storing liquid refrigerant and generates a circulating driving force of the refrigerant in the use side circuit (x1). .

In the drive source circuit (x4), the primary refrigerant is condensed in the pressurized heat exchanger (b), while the primary refrigerant is evaporated in the decompressed heat exchanger (d). Thereby, in the driving force generation circuit (x3), the secondary refrigerant is heated in the pressurized heat exchanger (b) to generate high pressure, while the depressurized heat exchanger (d)
In step (2), the secondary refrigerant is cooled to generate a low pressure. Then, one of the tanks (t
1) and the pressurized heat exchanger (b)
(t2) and the decompression heat exchanger (d), and one tank (t1)
And the other tank (t2) is depressurized. As a result, the high-low pressure difference becomes the driving force, and the secondary-side refrigerant circulates in the use-side circuit (x1). In the use side circuit (x1), the secondary refrigerant releases the hot or cold heat absorbed in the main heat exchanger (f) in the use side heat exchanger (e).

Therefore, the restriction on the arrangement position of the equipment is small,
A non-powered heat transfer type heat transfer device having high reliability and versatility can be realized.

[0010]

In the above heat transfer device,
In order to continuously circulate the refrigerant in the use side circuit (x1), by appropriately switching a plurality of solenoid valves (SV), both tanks (t1), (t2) and the pressurized heat exchanger (b) and the pressure reduction Heat exchanger
The communication state with (d) is alternately switched.
In other words, the empty tank after the supply of the refrigerant is communicated with the decompression heat exchanger (d) so that the refrigerant is sucked into the inside of the tank, and the tank that is fully filled with the refrigerant is added. The refrigerant is communicated with the pressure heat exchanger (b) to push the refrigerant out of the tank. By doing this,
Since the refrigerant is always supplied from one of the tanks to the use side circuit (x1), the refrigerant can be continuously transported.

However, conventionally, the switching of the solenoid valve (SV) is uniformly performed at a predetermined fixed time irrespective of the heat transfer capability and the like, so that the switching is performed at an inappropriate time and the operating efficiency is reduced. In some cases. Therefore, more advanced switching control has been desired.

The present invention has been made in view of the foregoing, and an object of the present invention is to provide a switching timing of switching means for switching a communication state between a tank, a pressurized heat exchanger, and a depressurized heat exchanger. The purpose of the present invention is to improve the performance of the heat transfer device by adjusting the temperature.

[0013]

In order to achieve the above object, the present invention improves the switching timing or switching period of the switching means.

Specifically, the heat transfer device according to the present invention comprises:
A driving force generating circuit (6) for generating a driving force for transporting the refrigerant,
A use-side circuit (7) having a heat source and a use-side heat exchanger (5), wherein the drive-side circuit (7) transports the refrigerant supplied from the drive force generation circuit (6) to generate the drive force. A heat transfer device to be recovered in the circuit (6), wherein the driving force generation circuit (6) has first and second tanks (141, 142) in which a gas port and a liquid port are formed, and a liquid refrigerant is stored. A pressurized heat exchanger (131) that generates a high pressure by heating a refrigerant, and a reduced pressure heat exchanger (1) that generates a low pressure by cooling a refrigerant.
50) and the first tank (141) with the pressurized heat exchanger (131).
A first communicating state, wherein the second tank (142) is communicated with the decompression heat exchanger (150) to be a decompression tank that sucks the liquid refrigerant, and The second tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger (150) to form a depressurized tank. Main switching means (M1) for alternately switching between the second communication state and the second communication state is provided, and the capacity control means (20) for adjusting the heat transfer capacity and the smaller capacity tank of the two tanks (141, 142) are provided. Main switching control means (31) for switching the main switching means (M1) at predetermined intervals equal to the cycle in which the saturated filling state and the empty state are repeated during the maximum capacity operation.

According to the above, the first communication state and the second communication state are switched at predetermined intervals equal to the cycle in which the smaller capacity tank repeatedly repeats the saturated filling state and the empty state during the maximum capacity operation. It is possible to prevent the operation from continuing with the other tank (a tank having the same capacity or a larger capacity as the above-mentioned tank) in a saturated filling state, and from continuing the operation in an empty state. Therefore, operation efficiency is improved. In addition, the main switching means (M1) is prevented from repeating the switching operation excessively, and deterioration of the main switching means (M1) is suppressed. Therefore, the reliability of the device is improved.

Further, another heat transfer device according to the present invention comprises a driving force generating circuit (6) for generating a driving force for transporting the refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). A heat transfer device for transporting the refrigerant supplied from the driving force generation circuit (6) in the use side circuit (7) and collecting the refrigerant in the driving force generation circuit (6), wherein the driving force is A gas port and a liquid port are formed in the generating circuit (6), and a first port for storing a liquid refrigerant is provided.
And a second tank (141, 142), a pressurized heat exchanger (131) that generates high pressure by heating the refrigerant, and a decompressed heat exchanger (15) that generates low pressure by cooling the refrigerant.
0), the first tank (141) is connected to the pressurized heat exchanger (131) to form a pressurized tank for extruding the liquid refrigerant, and the second tank (142) is connected to the decompressed heat exchanger (150). A) a first communication state in which a pressure reducing tank that sucks the liquid refrigerant by communicating with
The second tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger (150) to form a depressurized tank. Main switching means (M1) for alternately switching between the first and second communication states, and a capacity control means (20) for adjusting the heat transfer capacity, and a predetermined step set in advance in accordance with the heat transfer capacity. Main switching control means (31) for switching the main switching means (M1) for each cycle.

According to the above, the switching cycle of the main switching means (M1) is changed according to the heat transfer capacity, and the main switching means (M1) is switched at a cycle suitable for the capacity. As a result, it is possible to prevent the refrigerant conveyance failure due to the delay of the switching timing and the repetitive complicated switching operation due to the switching timing being too early.

Further, another heat transfer device according to the present invention comprises a driving force generating circuit (6) for generating a driving force for transporting the refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). A heat transfer device for transporting the refrigerant supplied from the driving force generation circuit (6) in the use side circuit (7) and collecting the refrigerant in the driving force generation circuit (6), wherein the driving force is A gas port and a liquid port are formed in the generating circuit (6), and a first port for storing a liquid refrigerant is provided.
And a second tank (141, 142), a pressurized heat exchanger (131) that generates high pressure by heating the refrigerant, and a decompressed heat exchanger (15) that generates low pressure by cooling the refrigerant.
0), the first tank (141) is connected to the pressurized heat exchanger (131) to form a pressurized tank for extruding the liquid refrigerant, and the second tank (142) is connected to the decompressed heat exchanger (150). A) a first communication state in which a pressure reducing tank that sucks the liquid refrigerant by communicating with
The second tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger (150) to form a depressurized tank. Main switching means (M1) for alternately switching between the first communication state and the second communication state, and a refrigerant amount detection means for detecting the amount of refrigerant supplied to the use side circuit (7) or the amount of refrigerant recovered from the use side circuit (7) ( 27), the main switching means (M1) while changing the switching cycle based on the refrigerant supply amount or the refrigerant recovery amount detected by the refrigerant amount detection means (27)
Main switching control means (31) for switching between the two.

According to the above, when the amount of refrigerant supplied to the use side circuit (7) or the amount of recovered refrigerant from the use side circuit (7) is large, the first tank (141) and the second tank (142) are empty. Alternatively, the time until the saturated filling state is shortened, but the main switching means (M1) is switched while being changed so as to shorten the switching period, so that the first communication state and the second communication state are switched at an appropriate time. Switching is performed. Therefore, both tanks (141), (1
42) is prevented from continuing the operation with the empty or overfilled state. On the other hand, when the refrigerant supply amount or the refrigerant recovery amount is small, the time until both tanks (141) and (142) become empty or in the saturated filling state becomes longer, but the main switching means (M1)
Is switched while being changed so that the switching cycle becomes longer, so that the communication state is switched at an appropriate time. Therefore, excessive switching operation of the main switching means (M1) is prevented, and deterioration of the main switching means (M1) is suppressed.

Further, another heat transfer device according to the present invention comprises a driving force generating circuit (6) for generating a driving force for transporting the refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). A heat transfer device for transporting the refrigerant supplied from the driving force generation circuit (6) in the use side circuit (7) and collecting the refrigerant in the driving force generation circuit (6), wherein the driving force is A gas port and a liquid port are formed in the generating circuit (6), and a first port for storing a liquid refrigerant is provided.
And a second tank (141, 142), a pressurized heat exchanger (131) that generates high pressure by heating the refrigerant, and a decompressed heat exchanger (15) that generates low pressure by cooling the refrigerant.
0), the first tank (141) is connected to the pressurized heat exchanger (131) to form a pressurized tank for extruding the liquid refrigerant, and the second tank (142) is connected to the decompressed heat exchanger (150). A) a first communication state in which a pressure reducing tank that sucks the liquid refrigerant by communicating with
The second tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger (150) to form a depressurized tank. Main switching means (M1) for alternately switching between the first communication state and the first communication state.
And first and second empty detecting means (21, 22) for respectively detecting the empty state of the liquid refrigerant in the second tank (141, 142), and receiving a detection signal from the first empty detecting means (21). The main switching means (M1) is switched from the first communication state to the second communication state so that the first tank (141) sucks the liquid refrigerant, while the second switching means (22) receives a signal from the second empty detection means (22). Main switching control means (31) for switching the main switching means (M1) from the second communication state to the first communication state so that the second tank (142) sucks the liquid refrigerant when receiving the detection signal. It is what you have decided.

According to the above-mentioned matter, it is possible to prevent the communication state from being continued while the first tank or the second tank is in an empty state, and to continuously carry the refrigerant. Further, even in the case where the load of heat transfer changes suddenly, the main switching means (M1) is switched immediately when the first tank or the second tank becomes empty, so that the main switching means (M1)
Will always be switched at the right time. Therefore, operation efficiency is improved.

Further, another heat transfer device according to the present invention includes a driving force generating circuit (6) for generating a driving force for transporting the refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). A heat transfer device for transporting the refrigerant supplied from the driving force generation circuit (6) in the use side circuit (7) and collecting the refrigerant in the driving force generation circuit (6), wherein the driving force is A gas port and a liquid port are formed in the generating circuit (6), and a first port for storing a liquid refrigerant is provided.
And a second tank (141, 142), a pressurized heat exchanger (131) that generates high pressure by heating the refrigerant, and a decompressed heat exchanger (15) that generates low pressure by cooling the refrigerant.
0), the first tank (141) is connected to the pressurized heat exchanger (131) to form a pressurized tank for extruding the liquid refrigerant, and the second tank (142) is connected to the decompressed heat exchanger (150). A) a first communication state in which a pressure reducing tank that sucks the liquid refrigerant by communicating with
The second tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger (150) to form a depressurized tank. Main switching means (M1) for alternately switching between the first communication state and the first communication state.
And first and second overfill detection means (24, 25) for respectively detecting the overfill state of the liquid refrigerant in the second tank (141, 142), and detection from the first overfill detection means (24). Upon receiving the signal, the main switching means (M1) is switched from the second communication state to the first communication state so that the first tank (141) pushes out the liquid refrigerant, while the second overfill detection means ( When the detection signal is received from the second tank (14)
2) is provided with main switching control means (31) for switching the main switching means (M1) from the first communication state to the second communication state so as to push out the liquid refrigerant.

According to the above-mentioned matter, it is possible to prevent the communication state from being continued while the first tank or the second tank is in the overfilled state, and to ensure the continuous transfer of the refrigerant.
Even in the case where the heat transfer load changes suddenly, the main switching means (M1) is switched immediately when the first tank or the second tank is overfilled, so that the switching is always performed at an appropriate time. Will be done. Therefore, operation efficiency is improved.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and installed at a higher position than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2) is provided, and the auxiliary switching means (M
An auxiliary switching control means (32) may be provided for switching in 2) in conjunction with the main switching means (M1).

According to the above, since the auxiliary switching means (M2) is switched in conjunction with the main switching means (M1), a dedicated timer for switching the auxiliary switching means (M2) becomes unnecessary.
The device is constructed inexpensively.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and located at a position higher than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). An auxiliary switching means (M2) may be provided, and an auxiliary switching control means (32) for switching the auxiliary switching means (M2) at a cycle longer than a switching cycle of the main switching means (M1) may be provided.

According to the above, since the auxiliary switching means (M2) is switched at a cycle longer than the switching cycle of the main switching means (M1), the number of times of switching is reduced. Therefore, the auxiliary switching means (M
2) Deterioration is suppressed, and the reliability of the device is improved.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and installed at a position higher than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). An auxiliary switching means (M2) may be provided, and an auxiliary switching control means (32) for switching the auxiliary switching means (M2) at a cycle shorter than the switching cycle of the main switching means (M1) may be provided.

According to the above, the auxiliary switching means (M2) is switched in a cycle shorter than the switching cycle of the main switching means (M1), so that the supply amount and the supply amount per one cycle of the auxiliary tank (143) are small. The size of the auxiliary tank (143) can be easily reduced.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port, and installed at a position higher than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2) is provided, and auxiliary switching control means (32) for switching the auxiliary switching means (M2) from the supply state to the supply state at a time different from the switching time of the main switching means (M1). Is also good.

According to the above, generally, auxiliary switching means
Immediately after switching (M2) from the supply state to the supply state, the operation of the pressurized heat exchanger (131) tends to be unstable, and
Immediately after the switching of the main switching means (M1), the operation tends to be unstable, but the auxiliary switching means (M2) is switched from the supply state to the supply state at a different time from the switching time of the main switching means (M1). The instability of the operation caused by the simultaneous switching of the switching means (M1) and the auxiliary switching means (M2) can be eliminated, and stable heat transfer can be achieved.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and located at a higher position than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2), and an auxiliary switching control means (32) for switching the auxiliary switching means (M2) such that the duration of the supply state is longer than the duration of the supply state.
May be provided.

According to the above, the liquid refrigerant is supplied to the auxiliary tank (14
In the supply state supplied from (3), the refrigerant flows by natural fall mainly due to the action of gravity, whereas in the supply state in which the liquid refrigerant is supplied to the auxiliary tank (143), the refrigerant is assisted by the pressure difference. It is sucked into the tank (143). Therefore, in general, the time until the auxiliary tank (143) becomes empty is longer than the time until the auxiliary tank (143) becomes saturated. Therefore, by switching the auxiliary switching means (M2) so that the duration of the supply state is longer than the duration of the supply state, the switching timing is optimized.

The auxiliary switching control means (32) may be configured to switch the auxiliary switching means (M2) at predetermined intervals.

According to the above, the switching control of the auxiliary switching means (M2) can be easily performed.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and located at a higher position than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2) is provided, and the auxiliary switching means is provided at predetermined intervals set in advance in accordance with the heat transfer capacity in advance.
An auxiliary switching control means (32) for switching (M2) may be provided.

Due to the above, the auxiliary switching means (M2) is switched at a cycle suitable for the heat transfer capacity, and the supply of the refrigerant to the pressurized heat exchanger (131) is insufficient due to a delay in the switching timing, or the switching timing is too early. This prevents a complicated switching operation from being repeated.

The driving force generating circuit (6) has an auxiliary tank (143) provided with a gas port and a liquid port and installed at a higher position than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2) is provided, and a refrigerant amount detecting means (27)
An auxiliary switching control means (32) for switching the auxiliary switching means (M2) while changing the switching cycle based on the detected refrigerant supply amount or refrigerant recovery amount.

As described above, when the amount of the refrigerant supplied to the use side circuit (7) is large, the amount of the refrigerant evaporated in the pressurized heat exchanger (131) also increases, and the liquid in the pressurized heat exchanger (131) is increased. Although the refrigerant tends to be insufficient, the switching cycle of the auxiliary switching means (M2) is changed to be shorter based on the refrigerant supply amount, and a sufficient amount of liquid refrigerant is supplied to the pressurized heat exchanger (131). On the other hand, when the amount of refrigerant supplied from the pressurized tank to the utilization side circuit (7) is small, the amount of refrigerant evaporated in the pressurized heat exchanger (131) is reduced, and the amount of refrigerant in the pressurized heat exchanger (131) is reduced. Is slightly excessive, but the switching cycle of the auxiliary switching means (M2) is changed to be longer, the refrigerant supply amount to the pressurized heat exchanger (131) is reduced, and the refrigerant amount is optimized.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and installed at a position higher than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2), and a third empty detection means (23) for detecting the empty state of the liquid refrigerant in the auxiliary tank (143) is provided,
An auxiliary switching control means (32) for switching the auxiliary switching means (M2) to a supply state when receiving a detection signal from the third empty detection means (23) may be provided.

According to the above, the operation is prevented from continuing with the auxiliary tank (143) being empty, and the supply of the refrigerant to the pressurized heat exchanger (131) is reliably performed. Also,
Even if the heat transfer load changes suddenly,
Since switching is performed immediately when the auxiliary tank (143) becomes empty, the auxiliary switching means (M2) is always switched at an appropriate time.

The driving force generating circuit (6) includes an auxiliary tank (143) provided with a gas port and a liquid port and installed at a position higher than the pressurized heat exchanger (131). The auxiliary tank (143) communicates with the pressurized heat exchanger (131) via the liquid tank, and supplies the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131) through the liquid port. The auxiliary tank (143) communicates with the reduced-pressure heat exchanger (150) through the gas inlet / outlet, and the supply state is switched between a liquid line of a circuit and a liquid refrigerant sucked into the auxiliary tank (143). Auxiliary switching means (M2) and third overfill detection means (26) for detecting an overfill state of the liquid refrigerant in the auxiliary tank (143) are provided. An auxiliary switching control means (32) for switching the auxiliary switching means (M2) to the supply state when receiving the detection signal may be provided.

By the above-mentioned matter, the operation is prevented from continuing with the auxiliary tank (143) being overfilled, and the supply of the refrigerant to the pressurized heat exchanger (131) is appropriately performed. Further, even when the load of heat transfer changes suddenly, the auxiliary switching means (M2) is always switched at an appropriate time.

The empty detecting means includes a tank (141, 142, 143)
Or a temperature sensor (21a, 21b) provided at the lower part of the tank.

As described above, when the temperature detected by the temperature sensors (21a, 21b) exceeds a predetermined value, the tank (141, 142, 14
3) is determined to be empty, and the empty state of the tank is reliably detected.

The empty detecting means may be constituted by a liquid level sensor (27a, 27b) for detecting the liquid level of the liquid refrigerant in the tank.

According to the above, when the liquid level falls below the predetermined position, it is determined that the tank is empty, and the empty state of the tank is directly and reliably detected.

The above-mentioned overfill detecting means includes a tank (141, 142, 1).
It may be constituted by a gas pipe (37) connected to the gas inlet / outlet of (43) or a temperature sensor (22a, 22b) provided at the upper part of the tank.

According to the above, when the temperature detected by the temperature sensors (22a, 22b) falls below a predetermined value, it is determined that the tank is overfilled, and the overfilled state of the tank is reliably detected.

The filling detecting means may be constituted by a liquid level sensor (27a, 27b) for detecting the liquid level of the liquid refrigerant in the tank.

According to the above, when the liquid level exceeds a predetermined position, it is determined that the tank is overfilled, and the overfilled state of the tank is directly and reliably detected.

[0052]

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

<First Embodiment>-Overall Configuration of Heat Transfer Apparatus (1) First, the overall configuration of the heat transfer apparatus (1) will be described. As shown in FIG. 1, the heat transfer device (1) includes a heat drive unit (2) and a plurality of use side units (3) connected to each other.

Each use side unit (3) is provided with a use side heat exchanger (5) and a flow control valve (4).

As shown in FIG. 2, the heat drive unit (2)
Generates a driving force for transporting the refrigerant by increasing and decreasing the pressure of the tanks (141) and (142), and includes a driving force generation circuit (6), a use side circuit (7), and a heat source circuit (8). .

The heat source circuit (8) includes a main circuit (157) and a cooling circuit (1).
56), an auxiliary circuit (155), and first to third bypass circuits (15
4), (153) and (152). The heat source circuit (8) serves as a heat source of the use side circuit (7) via the main heat exchanger (158).

The main circuit (157) includes a compressor (160) and a four-way switching valve.
(159), heat source side heat exchanger (128), pressurized heat exchanger (131), expansion valve (134), main heat exchanger (158), and the four-way switching valve (15
9) are connected in order. Heat source side heat exchanger (1
28) and the pressure heat exchanger (131), between the heat source side heat exchanger (1
A first check valve (161) that allows only the refrigerant flow in the direction from the pressure heat exchanger (131) to the pressurized heat exchanger (131) is provided. Expansion valve
A second check valve (162) that allows only the refrigerant flow in the direction from the expansion valve (134) to the main heat exchanger (158) is provided between the main heat exchanger (158) and the main heat exchanger (158). Have been.

The cooling circuit (156) has an upstream end connected between the pressurized heat exchanger (131) and the expansion valve (134) in the main circuit (157), and a downstream end connected to the four ends in the main circuit (157). It is connected between the path switching valve (159) and the suction side pipe of the compressor (160). The cooling circuit (156) is provided with a capillary tube (151) and a reduced-pressure heat exchanger (150) in order from the upstream end to the downstream end.

The auxiliary circuit (155) has one end connected between the pressurized heat exchanger (131) in the main circuit (157) and the upstream end of the cooling circuit (156), and the other end connected to the cooling circuit (156). Is connected between the reduced-pressure heat exchanger (150) and the downstream end. Auxiliary circuit (15
5), the expansion valve (14
9) and an auxiliary heat exchanger (148) are provided.

One end of the first bypass circuit (154) is a main circuit.
(157) is connected between the second check valve (162) and the main heat exchanger (158), and the other end is connected to the pressurized heat exchanger (131) and the cooling circuit (156) in the main circuit (157). Connected to the upstream end of the The first bypass circuit (154) is provided with a receiver (149A) and a third check valve (163) in order from the one end to the other end. The third check valve (163) is a check valve that allows only the refrigerant flow in the direction from the one end to the other end.

One end of the second bypass circuit (153) is a main circuit.
(157) is connected between the expansion valve (134) and the second check valve (162), and the other end is connected to the heat source side heat exchanger in the main circuit (157).
(128) and the first check valve (161). Second
The bypass circuit (153) is provided with a fourth check valve (164) that allows only the refrigerant flow in the direction from one end to the other end.

One end of the third bypass circuit (152) is a main circuit.
(157) is connected between the main heat exchanger (158) and the four-way switching valve (159), and the other end is a first check valve in the main circuit (157).
(161) and the pressurized heat exchanger (131). The third bypass circuit (152) is provided with a fifth check valve (165) that allows only the refrigerant flow in the direction from the one end to the other end.

The driving force generating circuit (6) includes a first tank (141), a second tank (142), and an auxiliary tank (143) each having a gas port at an upper end and a liquid port at a lower end. Have. The upper end of the first tank (141) and the pressurized heat exchanger (13
The upper end of 1) is connected by a pipe provided with a first pressurizing solenoid valve (111). The upper end of the second tank (142) and the upper end of the pressurized heat exchanger (131) are connected to the second pressurized solenoid valve (11
2) are connected by piping provided. The upper end of the auxiliary tank (143) and the upper end of the pressurized heat exchanger (131) are connected by a pipe provided with an auxiliary pressurized solenoid valve (113).

The upper end of the first tank (141) and the vacuum heat exchanger
The upper end of (132) is connected by a pipe provided with a first pressure reducing solenoid valve (114). The upper end of the second tank (142) and the upper end of the decompression heat exchanger (132) are connected to a second decompression solenoid valve.
(115) are connected by piping provided. The upper end of the auxiliary tank (143) and the upper end of the reduced-pressure heat exchanger (132) are connected by a pipe provided with an auxiliary reduced-pressure solenoid valve (116).

The first pressurizing solenoid valve (111) and the second pressurizing solenoid valve (11)
2), the first pressure reducing solenoid valve (114) and the second pressure reducing solenoid valve (115)
One of the first tank (141) and the second tank (142) is connected to a pressurized heat exchanger (131) to be a pressurized tank, and the other tank is a decompressed heat exchanger (132). And a main switching mechanism (M1) that communicates with the pressure reducing tank. The auxiliary pressurizing solenoid valve (113) and the auxiliary pressure reducing solenoid valve (116)
The upper part of the auxiliary tank (143) communicates with the pressurized heat exchanger (131) to supply the liquid refrigerant in the auxiliary tank (143) to the pressurized heat exchanger (131). ) And vacuum heat exchanger (15
0) and an auxiliary switching mechanism (M
2) is configured.

Below the first tank (141), the first tank
(141) a first outflow check valve (117) that allows only the refrigerant flow in a direction to supply the liquid refrigerant in the use side circuit (7), and from the use side circuit (7) to the first tank (141). A first inflow check valve (118) that allows only the refrigerant flow in the inflow direction;
A first recovery check valve (119) is provided to allow only the refrigerant flow in the direction of recovering the refrigerant from 2) to the first tank (141).

Similarly, below the second tank (142), a second outflow check which allows only the refrigerant flow in the direction in which the liquid refrigerant in the second tank (142) is supplied to the use side circuit (7) is provided. Valve (120),
A second inflow check valve (121) that allows only a refrigerant flow in a direction of flowing into the second tank (142) from the utilization side circuit (7), and a refrigerant from the decompression heat exchanger (132) into the second tank ( A second recovery check valve (122) that allows only the refrigerant flow in the recovery direction is provided at 142).

Below the auxiliary tank (143), an auxiliary tank
(143) a liquid supply check valve (123) that allows only the refrigerant flow in the direction of supplying the liquid refrigerant to the pressurized heat exchanger (131); A liquid supply check valve (124) that allows only the refrigerant flow is provided. In addition,
The auxiliary tank (143) is positioned higher than the pressurized heat exchanger (131) so that the liquid refrigerant in the auxiliary tank (143) flows naturally to the pressurized heat exchanger (131) by the action of gravity. It is installed in. The liquid inlet and outlet of the auxiliary tank (143) and the pressurized heat exchanger (13
1) is connected through a liquid supply pipe (130).

The liquid recovery pipe (12) for recovering the refrigerant from the utilization side circuit (7) to the first tank (141) or the second tank (142) has:
An auxiliary heat exchanger (148) is provided. The auxiliary heat exchanger (148) is a heat exchanger provided mainly for adjusting the heat balance of the refrigerant in the heat source circuit (8).
The auxiliary heat exchanger (148) also serves to cool the refrigerant so that the refrigerant flowing into the first tank (141) or the second tank (142) does not contain bubbles.

At the upper ends of the first tank (141) and the second tank (142), a communication pipe (50) for communicating the tanks (141) and (142) with each other.
Is connected. The first tank (141) side of the middle portion is a first communication portion (50a), and the second tank (142) is closer than the middle portion.
The side is a second communication portion (50b). A refrigerant discharge pipe (53) connected to a pipe below the tanks (141) and (142) is connected to an intermediate portion of the communication pipe (50). A first discharge valve (51) is provided between an intermediate portion of the communication pipe (50) and the first tank (141), and a second discharge valve (51) is provided between the intermediate portion and the second tank (142). A discharge valve (52) is provided.

The pipes provided below the first tank (141) and the second tank (142) (the pipes provided with the outflow check valves (117) and (120)) are merged with each other to perform four-way switching. The first of the valve (147)
Connected to port. One end of the auxiliary heat exchanger (148) is connected to a third port of the four-way switching valve (147). The second port and the fourth port of the four-way switching valve (147)
It is connected to the user side circuit (7). In particular, the fourth port is connected to the lower end of the main heat exchanger (158) via the pipe (55). The four-way switching valve (147) communicates the first port with the second port and communicates the third port with the fourth port. The first state communicates the first port with the fourth port. It is configured to be able to select a port and a second state that communicates with the third port.

A liquid supply pipe (19) connecting the utilization side circuit (7) and the liquid inlets and outlets of both tanks (141) and (142) has a flow rate control for adjusting the supply amount of the liquid refrigerant from the pressurized tank. A valve (11) is provided. The liquid supply pipe (19) is provided with a flow rate sensor (27) as refrigerant supply amount detection means for detecting the refrigerant supply amount. Note that the flow rate sensor (27) may be provided in the liquid recovery pipe (12), and the capacity control may be performed by adjusting the recovery amount of the refrigerant in the pressure reducing tank.

The controller (30) includes the solenoid valves (111) to (116)
Connected to the main switching control unit (3) for controlling the main switching mechanism (M1).
1) and an auxiliary switching control unit (32) for controlling the auxiliary switching mechanism (M2)
It has. In addition, the controller (30)
1) and a flow rate sensor (27), a capacity control unit that adjusts the heat transfer capacity by controlling the flow rate regulating valve (11).
(33).

-Basic operation of heat transfer device (1)-In the cooling operation, the four-way switching valve (159) of the heat source circuit (8) and the four-way switching valve (147) of the driving force generating circuit (6) Are set on the solid line side in the figure.

In the heat source circuit (8), the refrigerant discharged from the compressor (160) is supplied to the heat source side heat exchanger (128) and the pressurized heat exchanger (13).
Condensed in 1). At this time, the driving force generating circuit (6) side of the pressurized heat exchanger (131) is heated, and a high pressure is generated. The refrigerant flowing out of the main heat exchanger (158) is diverted, and part of the expansion valve (134)
The other part flows into the cooling circuit (156) and expands in the capillary tube (151), and the other part expands in the auxiliary circuit (15).
5) and is expanded by the expansion valve (149). The refrigerant expanded and decompressed by the expansion valve (134) evaporates in the main heat exchanger (158).
On the other hand, the refrigerant expanded and decompressed by the capillary tube (151) evaporates in the decompression heat exchanger (150), and is decompressed by the decompression heat exchanger (15).
A low pressure is generated on the side of the driving force generation circuit (6) of (0). The refrigerant expanded and decompressed by the expansion valve (149) is supplied to the auxiliary heat exchanger (148).
And cools the refrigerant on the driving force generation circuit (6) side collected in the tanks (141) and (142). And the main heat exchanger (158)
The refrigerant flowing out of the compressor, the refrigerant flowing out of the decompression heat exchanger (150) and the refrigerant flowing out of the auxiliary heat exchanger (148) merge, and the compressor (16
Inhaled at 0).

In the driving force generating circuit (6), a first communication state and a second communication state described below are alternately repeated.
Thereby, the refrigerant is supplied from the driving force generation circuit (6) to the use side circuit (7), evaporates in the use side heat exchanger (35), cools the indoor air, and is cooled in the main heat exchanger (158). After being condensed, a circulation operation is performed in which the driving force is generated by the driving force generation circuit (6).

Specifically, in the first communication state, the first pressurizing solenoid valve (111) and the second pressure reducing solenoid valve (115) are set to the open state. On the other hand, the first depressurizing solenoid valve (114) and the second pressurizing solenoid valve (112) are set to a closed state. This allows
The first tank (141) communicates with the pressurized heat exchanger (131), and the second tank (142) communicates with the reduced-pressure heat exchanger (132). As a result, the first tank (141) is pressurized from above to become a pressurized tank, and the liquid refrigerant in the first tank (141) is pushed downward. The extruded refrigerant passes through the first outflow check valve (117) and the four-way switching valve (147) and flows into each use-side heat exchanger (35). This refrigerant is used in the use side heat exchanger (35)
In this case, heat exchange is performed with the indoor air to evaporate and cool the indoor air. The evaporated refrigerant flows out of the use-side heat exchanger (35), is condensed in the main heat exchanger (158), becomes a liquid refrigerant, passes through the four-way switching valve (147), and outputs a driving force generation circuit ( 6). The refrigerant flowing into the driving force generation circuit (6) is recovered to the second tank (142) through the second inflow check valve (121). At this time, the second tank (142) is decompressed by the decompression heat exchanger (132) to become a decompression tank.
The recovery of the refrigerant to the tank is performed smoothly.

As described above, the first communication state is the first tank state.
(141) becomes a pressurized tank, the second tank (142) becomes a depressurized tank, and the liquid refrigerant supplied from the first tank (141) flows through the use side circuit (7), and flows to the second tank (142). It is in a state of being collected.

By the way, if the first communication state is continued as it is, the liquid refrigerant in the first tank (141) tends to be insufficient, while the liquid refrigerant in the second tank (142) tends to be excessive. Therefore, the main switching mechanism (M1) executes switching control for switching the circulation operation of the refrigerant from the first communication state to the following second communication state, as described later.

In the second communication state, the first pressurizing solenoid valve (111) and the second depressurizing solenoid valve (115) are set to the closed state, while the first depressurizing solenoid valve (114) and the second This is a state in which the valve (112) is set to the open state. This allows the second tank (1
42) and the pressurized heat exchanger (131) communicate with each other, and the first tank (141) communicates with the reduced pressure heat exchanger (132). as a result,
The second tank (142) serves as a pressurized tank and is pressurized from above, and at the same time, the first tank (141) serves as a depressurized tank and is depressurized from above. Thereby, contrary to the first communication state, the liquid refrigerant is pushed out of the second tank (142), and the refrigerant circulation operation of recovering the liquid refrigerant to the first tank (141) is performed.

Then, when the liquid refrigerant in the second tank (142) becomes slightly short, the main switching mechanism (M1) switches again from the second communication state to the first communication state. in this way,
By alternately repeating the first communication state and the second communication state, the refrigerant circulates continuously.

The auxiliary tank (143) is a pressurized heat exchanger.
This is a tank for supplying a liquid refrigerant to (131). When the liquid refrigerant is insufficient in the pressurized heat exchanger (131), the auxiliary pressurizing solenoid valve (113) is set to the open state, and the auxiliary pressure reducing solenoid valve (116) is set to the closed state. As a result, a liquid refrigerant is supplied from the auxiliary tank (143) to the pressurized heat exchanger (131). As a result, the liquid refrigerant in the auxiliary tank (143) is extruded, and passes through the liquid supply pipe (130) to the pressurized heat exchanger (13).
1) will be supplied.

On the other hand, when the liquid refrigerant in the auxiliary tank (143) runs short, the auxiliary pressurizing solenoid valve (113) is set to the closed state and the auxiliary pressure reducing solenoid valve (116) is set to the open state. And it is in the replenishment state. As a result, the liquid refrigerant is
The auxiliary tank (143) is supplied through (124).

In the heating operation, the four-way switching valve (159) of the heat source circuit (8) and the four-way switching valve (147) of the driving force generating circuit (6)
Are set on the broken line side in the drawing, and the direction of circulation of the refrigerant in the use side circuit (7) is opposite to that during the above-described circulation operation. That is, the refrigerant supplied from the driving force generation circuit (6) evaporates in the main heat exchanger (158), condenses in the use side heat exchanger (35), and is recovered in the driving force generation circuit (6). Will be.

-Switching Control of Main Switching Mechanism- In the present embodiment, the first tank (141) or the second tank (142)
The main switching mechanism (M1) (i.e., the first pressurized solenoid valve) is switched at predetermined intervals equal to the cycle in which the smaller capacity tank repeatedly repeats the saturated filling state (full state) and the empty state during the maximum capacity operation. (111), second pressurizing solenoid valve (112), auxiliary pressurizing solenoid valve (1
13) and the first pressure reducing solenoid valve (114)). The controller (30) stores the predetermined cycle in advance in a built-in memory (not shown).
The switching control is executed with reference to a built-in timer (not shown).

Here, the maximum capacity operation means an operation at a preset maximum transfer capacity. In this embodiment, since the heat transfer capacity is controlled by adjusting the opening of the flow control valve (20), the maximum capacity operation refers to an operation in a state where the flow control valve (20) is fully opened. The cycle of repeating the saturated filling state and the empty state is the time from when the tank once in the saturated filling state starts supplying the liquid refrigerant until it becomes empty, or when the tank in the empty state collects the liquid refrigerant. It means the time from the start to the saturated filling state.

The reason for using the smaller capacity tank as a reference is that the cycle of the larger capacity tank is longer than the cycle of the smaller capacity tank. By doing so, it is possible to avoid a situation in which the operation is continued while the larger capacity tank is empty or saturated. In the present embodiment, since the capacities of the first tank (141) and the second tank (142) are equal to each other, the cycles of repeating the saturated filling state and the empty state during the maximum capacity operation are equal to each other. But the first
It goes without saying that the capacities of the tank (141) and the second tank (142) may be different.

By performing such switching control, the first pressurizing solenoid valve (111), the second pressurizing solenoid valve (112), the first pressure reducing solenoid valve (114), and the second pressure reducing solenoid valve (115) Can prevent excessive repetition of the opening and closing operation.
1), (112), (114), and (115) can be suppressed from deteriorating.
Therefore, the reliability of the device can be improved.

In this embodiment, the auxiliary switching mechanism (M2) (that is, the auxiliary pressurizing solenoid valve (113) and the auxiliary depressurizing solenoid valve (116)) is a main switching mechanism.
It is switched in conjunction with (M1). That is, the switching between the supply state and the supply state is performed when the first communication state and the second communication state are switched.

By performing such switching control, a dedicated timer for measuring the duration of the supply state and the supply state is not required, and the cost of the apparatus can be reduced.
Further, the configuration of the device can be simplified.

<Second Embodiment> In the second embodiment, the switching of the main switching mechanism (M1) is performed at predetermined intervals that are set in advance stepwise according to the heat transfer capacity.

In the present embodiment, the main switching control section (31) of the controller (30) stores in advance a heat transfer capacity and an appropriate switching cycle corresponding to the capacity in a table (corresponding to the capacity) based on experiments and simulations in advance. Table) format.

The controller (30) executes the capability control in the same manner as in the first embodiment, and selects a predetermined switching cycle according to the capability with reference to the table. For example,
When the capacity is relatively large, the supply and recovery amounts of the refrigerant in each of the tanks (141) and (142) are relatively large, so that the switching cycle is set to be short. On the other hand, when the capacity is relatively small, the supply amount and the recovery amount of the refrigerant are relatively small, so that the switching cycle is set to be longer. Thus, the main switching mechanism is selected while appropriately selecting the switching cycle according to the heat transfer capacity.
The switching operation of (M1) is performed.

Therefore, according to the present embodiment, the main switching mechanism (M1) can always be switched at an appropriate cycle.
The transfer of the refrigerant can be performed stably.

<Third Embodiment> In a third embodiment, the switching cycle of the main switching mechanism (M1) is changed based on the amount of refrigerant supplied to the driving force generation circuit (6).

Specifically, the amount of refrigerant supplied from the pressurized tank is detected by the flow rate sensor (27), and the detection result is sent to the controller (30). The main switching control unit (3
1) changes the switching cycle of the main switching mechanism (M1) based on the refrigerant supply amount. For example, when the supply amount of the refrigerant increases, the supply and recovery speed of the refrigerant in the first tank (141) and the second tank (142) increases, so that both the tanks (141) and (142) are empty or It is likely to be in a saturated filling state. Therefore, in such a case, the switching cycle of the main switching mechanism (M1) is changed to be shorter. Conversely, when the refrigerant supply amount decreases, both tanks (141), (1
Since it takes a lot of time until the state (42) becomes the empty state or the saturated filling state, the switching cycle of the main switching mechanism (M1) is changed to be longer.

Therefore, according to the present embodiment, the main switching mechanism
Switching of (M1) can be performed according to the operation state. Therefore, it is possible to prevent the operation from continuing in the empty state or the saturated filling state, and to suppress the deterioration of the main switching mechanism (M1) due to excessively repeating the switching operation.

<Fourth Embodiment> A fourth embodiment is directed to a tank
(141), detecting means (21), (22), (24), (25) for detecting the empty state and the overfilled state of (142), based on the detection result of the main switching mechanism (M1) The switching is performed.

As the first and second empty detecting means (21) and (22) for detecting the empty state of the first and second tanks (142) and (142), for example, as shown in FIG. And a temperature sensor (21) attached to a liquid pipe (36) connected to the liquid port of the tank.
a) or as shown in FIG. 3 (b), a temperature sensor (21b) attached directly to the lower part of the tank can be used. When the tank is empty, the temperature sensor (2
Since 1a) and (21b) detect the temperature of the gas refrigerant, the detected temperature rises compared to when the liquid refrigerant is detected. Therefore, when the detected temperature exceeds a predetermined temperature,
The tank is determined to be empty, and the empty state is detected.

First and second overfill detecting means (24), (25) for detecting the overfill state of the first and second tanks (141), (142).
For example, as shown in FIG. 4 (a), a temperature sensor (22a) attached to a gas pipe (37) connected to the gas inlet / outlet of the tank, or as shown in FIG. Temperature sensor (22b) mounted directly on top
Etc. can be used. In this case, when the tank becomes overfilled, the temperature sensors (22a) and (22b) detect the temperature of the liquid refrigerant, so the detected temperature is lower than when the gas refrigerant was detected. . Therefore, when the detected temperature becomes equal to or lower than the predetermined temperature, the tank is determined to be in an overfilled state, and the overfilled state is detected.

As shown in FIG. 5 (a) or (b), a liquid level sensor such as an electronic liquid level sensor (27a) or a float type liquid level sensor (27b) is provided inside the tank. The empty state and the overfilled state may be detected by directly detecting the liquid level of the refrigerant inside. In this case, if the liquid level is equal to or lower than the predetermined position, the state is determined to be empty.

The controller (30) includes the sky detecting means (21), (2)
When 2) detects the empty state of the pressurized tank, or when the filling detecting means (24), (25) detects the overfilled state of the pressure reducing tank, the main switching mechanism (M1) is switched. That is, when the first empty detecting means (21) detects the empty state of the first tank (141), or when the second overfill detecting means (25) detects the overfilled state of the second tank (142), The main switching mechanism (M1) is switched from the first communication state to the second communication state. On the other hand, the second sky detecting means (22)
Detects the empty state of the second tank (142), or detects the overfill state of the first tank (141) by the first overfill detecting means (24), the second switching mechanism (M1) The state is switched to the first communication state. In other words, when one of the tanks becomes empty or overfilled, the switching operation of the main switching mechanism (M1) is executed.

Therefore, according to the present embodiment, it is possible to prevent the operation from continuing with the tank being empty or overfilled, and it is possible to reliably carry out the continuous transport of the refrigerant. Therefore, heat transfer can be performed stably. In addition, even when the load suddenly changes, the main switching mechanism (M1) can always be switched at an appropriate time, and the switching control can be performed according to the load fluctuation, so that stable operation can be performed. Can be realized.

In this embodiment, the switching control is performed based on both the empty detection and the overfilling detection. However, the switching control may be performed based on either the empty detection or the overfilling detection. It is possible.

<Fifth Embodiment> In a fifth embodiment, as shown in FIG. 6, the switching cycle T2 of the auxiliary switching mechanism (M2) is shorter than the switching cycle T1 of the main switching mechanism (M1). The timing A2 at which the auxiliary switching mechanism (M2) is switched from the supply state to the supply state is different from the switching timing A1 of the main switching mechanism (M1). Here, the switching cycle T1 of the main switching mechanism (M1) and the switching cycle T2 of the auxiliary switching mechanism (M2) are each a fixed cycle, but they may be appropriately changed.

Specifically, in the present embodiment, the switching cycle T2 of the auxiliary switching mechanism (M2) is equal to the switching cycle T2 of the main switching mechanism (M1).
It is set to about 1/4 of 1. Then, the auxiliary tank (1
43) starts sucking the liquid refrigerant, that is, the time A2 when the supply state is switched from the supply state to the replenishment state.
The timing is set so as to be delayed by T2 from the switching timing of the first tank (141) and the second tank (142) so as to be different from the switching timing A1 of the first tank (142) and the second tank (142). In other words, the time when the auxiliary tank (143) is switched from the supply state to the supply state is determined by the first tank (141) and the second tank (142).
During the first communication state or the second communication state.

In general, immediately after the switching of the main switching mechanism (M1), the conveyance of the refrigerant tends to become unstable. Therefore, the main switching mechanism (M
Immediately after the switching of 1), the stability of the pressurizing operation of the pressurizing heat exchanger (131) is particularly desired. On the other hand, immediately after the auxiliary switching mechanism (M2) is switched from the supply state to the supply state, the operation of the pressurized heat exchanger (131) tends to be unstable. However, according to the present embodiment, when the auxiliary switching mechanism (M2) is switched from the supply state to the supply state, the main switching mechanism (M1) does not perform the switching operation and maintains the state at that time. .
Therefore, a stable refrigerant conveyance operation can be performed.

The auxiliary switching mechanism (M2) is replaced with the main switching mechanism (M1).
Since the switching is performed in a shorter cycle, the capacity of the auxiliary tank (143) may be smaller than that of the first tank (141) or the second tank (142). Therefore, the size of the auxiliary tank (143) can be reduced.

<Sixth Embodiment> In the sixth embodiment, the switching cycle T2 of the auxiliary switching mechanism (M2) is made longer than the switching cycle T1 of the main switching mechanism (M1).

When the capacity of the auxiliary tank (143) is relatively large or when the capacity of the pressurized heat exchanger (131) is relatively small, the switching operation of the auxiliary switching mechanism (M2) does not need to be performed frequently. There are cases. In such a case, the auxiliary pressurizing solenoid valve (113)
If the number of opening and closing operations of the auxiliary pressure reducing electromagnetic valve (116) is reduced, the life of these electromagnetic valves (113) and (116) can be extended. Therefore, in the present embodiment, the deterioration of the auxiliary switching mechanism (M2) is suppressed by setting the switching cycle T2 of the auxiliary switching mechanism (M2) to be longer than the switching cycle T1 of the main switching mechanism (M1). .

<Seventh Embodiment> As shown in FIG.
The embodiment is based on the duration P of the supply state of the auxiliary switching mechanism (M2).
2 is longer than the supply time duration P1.

Since the auxiliary tank (143) is installed at a position higher than the pressurized heat exchanger (131), the auxiliary tank (143)
The refrigerant supplied to the pressurized heat exchanger (131) from (3) mainly falls naturally due to the action of gravity,
Conveyed to 1). On the other hand, the refrigerant supplied from the liquid line of the circuit to the auxiliary tank (143) is supplied to the auxiliary tank (143) by a suction force (a suction force due to a pressure difference) corresponding to the degree of pressure reduction of the auxiliary tank (143). Conveyed. Since the speed of transport by natural fall is lower than the speed of transport by suction force, the time required for the auxiliary tank (143) to change from the saturated filling state to the empty state is longer than the time required for the auxiliary tank (143) to change from the empty state to the saturated filling state. Is also long.

Therefore, in the present embodiment, in consideration of such a characteristic of the system, the duration P2 of the supply state of the auxiliary switching mechanism (M2) is set to be longer than the duration P1 of the supply state. Therefore, the auxiliary switching mechanism (M2) can be switched at an appropriate time, and stable and efficient heat transfer operation can be performed.

<Eighth Embodiment> In the eighth embodiment, the switching cycle of the auxiliary switching mechanism (M2) is changed by the main switching mechanism (M2) of the second embodiment.
Similar to the switching cycle of 1), the switching is performed at predetermined intervals that are set in advance in accordance with the heat transfer capacity.

That is, in the auxiliary switching control section (32) of the controller (30), an appropriate switching cycle set in advance based on experiments, simulations, and the like is stored in the form of a table. The controller (30) performs the capability control in the same manner as in the second embodiment, and appropriately selects a switching cycle according to the capability based on the table, and switches the auxiliary switching mechanism (M2).

Therefore, according to the present embodiment, the switching control of the auxiliary switching mechanism (M2) corresponding to the heat transfer capability can be executed, so that the heat transfer can be performed stably.

<Ninth Embodiment> In the ninth embodiment, the switching cycle of the auxiliary switching mechanism (M2) is set to the main switching mechanism (M2) of the third embodiment.
Similar to the switching cycle of 1), the change is made according to the amount of refrigerant supplied to the driving force generation circuit (6).

Since the specific control method is the same as that of the third embodiment, the description is omitted.

According to the present embodiment, the switching of the auxiliary switching mechanism (M2) can be performed according to the operation state. Therefore, operation efficiency can be improved.

<Tenth Embodiment> In the tenth embodiment, the auxiliary tank (143) is provided with detecting means (23) and (26) for detecting an empty state and an overfilled state, and the auxiliary switching is performed based on the detection result. The mechanism (M2) is switched.

Third state for detecting the empty state of the auxiliary tank (143)
As the detection means (23) and the third overfill detection means (26) for detecting the overfill state, the empty detection means (21), (2
2) and overfill detection means (24) and (25) can be used. That is, as the third sky detecting means (23),
A temperature sensor provided below the liquid pipe of the auxiliary tank (143) or the auxiliary tank (143), a liquid level sensor provided in the auxiliary tank (143), or the like can be used. Further, as the third overfill detection means (26), a temperature sensor provided on the gas pipe of the auxiliary tank (143) or the upper part of the auxiliary tank (143),
A liquid level sensor or the like provided in the auxiliary tank (143) can be used.

The switching control of the auxiliary switching mechanism (M2) is the same as the switching control of the main switching mechanism (M1) of the fourth embodiment, and a description thereof will be omitted.

According to the present embodiment, the operation can be prevented from continuing with the auxiliary tank (143) being empty or overfilled, and the supply of refrigerant to the pressurized heat exchanger (131) can be stabilized. Can be performed reliably.

In this embodiment, the switching control is performed based on both the empty detection and the overfilling detection. However, the switching control can be performed based on only one of the empty detection and the filling detection. It is.

[0125]

As described above, according to the heat transfer apparatus according to the present invention, the main switching is performed at a predetermined cycle equal to the cycle in which the tank with the smaller capacity repeats the saturated filling state and the empty state during the maximum capacity operation. Since the means is switched, it is possible to prevent the operation from continuing while the other tank is in the saturated filling state or the empty state. Therefore, highly efficient operation can be stably performed. Further, since the main switching means can be prevented from excessively repeating the switching operation, the life of the main switching means is extended and the reliability is improved. as a result,
The reliability of the device can be improved, and a longer life can be achieved.

Further, according to another heat transfer device according to the present invention, the main switch is switched at predetermined intervals set in stages according to the heat transfer capability. The switching is performed at a cycle suitable for the capacity, and it is possible to prevent a refrigerant conveyance failure due to a delay in the switching timing and an excessive repetition of the switching operation due to a too early switching timing.

According to another heat transfer device of the present invention, the switching cycle of the main switching means is changed according to the amount of refrigerant supplied from the use side circuit or the amount of refrigerant recovered to the use side circuit. Therefore, the main switching means can be switched at a time suitable for the operating state.

According to another heat transfer device of the present invention, the empty detecting means for detecting the empty state of the tank is provided, and the main switching means is switched based on the empty detection.
It is possible to reliably prevent the operation from being continued while the tank is empty, and to achieve stable and efficient heat transfer.

According to another heat transfer device of the present invention, the overfill detecting means for detecting the overfill state of the tank is provided, and the main switching means is switched based on the overfill detection. Can be reliably prevented from continuing in an overfilled state, and stable and efficient heat transfer can be achieved.

By providing an auxiliary tank for supplying the liquid refrigerant to the pressurized heat exchanger, the performance of the apparatus is improved, and the auxiliary switching means for switching the communication state of the auxiliary tank is switched in conjunction with the main switching means. This eliminates the need for a dedicated timer for switching the auxiliary switching means, and can promote cost reduction of the device.

By switching the auxiliary switching means at a cycle longer than the switching cycle of the main switching means, the number of times of switching of the auxiliary switching means is reduced, and excessive repetition of the switching operation can be prevented. Can be suppressed.

By switching the auxiliary switching means in a cycle shorter than the switching cycle of the main switching means, the amount of supply and replenishment of refrigerant required for one switching cycle is reduced, so that the size of the auxiliary tank can be reduced. it can.

By switching the auxiliary switching means from the supply state to the supply state at a time different from the switching time of the main switching means, the operation can be stabilized, and stable heat transfer can be achieved.

By switching the auxiliary switching means so that the duration of the supply state of the auxiliary tank is longer than the duration of the supply state, the switching can be performed according to the characteristics of the apparatus.

By switching the auxiliary switching means at predetermined intervals, switching control of the auxiliary switching means (M2) can be simplified and the cost of the apparatus can be reduced.

By switching the auxiliary switching means at predetermined intervals set stepwise according to the heat transfer capacity, the auxiliary switching means can be switched at an appropriate time according to the operation state, and stable operation is performed. be able to.

By changing the switching cycle of the auxiliary switching means in accordance with the amount of refrigerant supplied to the utilization side circuit or the amount of refrigerant recovered from the utilization side circuit, the auxiliary switching means is switched to an appropriate timing according to the operation state. And stable operation can be performed.

By providing an empty detecting means for detecting the empty state of the auxiliary tank and switching the auxiliary switching means when the empty state is detected, it is possible to prevent the operation from continuing with the auxiliary tank being empty. it can.

By providing a filling detecting means for detecting the filling state of the auxiliary tank and switching the auxiliary switching means when the filling state is detected, it is possible to prevent the operation from continuing with the auxiliary tank being filled. it can.

By forming the empty detecting means by a liquid pipe connected to the liquid inlet / outlet of the tank or a temperature sensor provided at the lower part of the tank, the empty state can be reliably detected.

By forming the empty state detecting means with a liquid level sensor for detecting the liquid level of the refrigerant in the tank, it is possible to reliably detect the empty state.

If the filling detecting means is constituted by a gas pipe connected to the gas inlet / outlet of the tank or a temperature sensor provided on the upper part of the tank, it is possible to reliably detect the filling state.

When the filling detecting means is constituted by a liquid level sensor for detecting the liquid level of the refrigerant in the tank, it is possible to reliably detect the charged state.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a heat transfer device.

FIG. 2 is a configuration diagram of a heat drive unit.

FIG. 3 is a schematic diagram of the vicinity of a tank for explaining a configuration of an empty detection unit.

FIG. 4 is a schematic diagram of the vicinity of a tank for explaining a configuration of a filling detection unit.

FIG. 5 is a schematic diagram of a tank for explaining a configuration of an empty detection unit and a filling detection unit.

FIG. 6 is a time chart showing switching times of a main switching unit and an auxiliary switching unit.

FIG. 7 is a time chart showing a switching timing of an auxiliary switching unit.

FIG. 8 is an overall configuration diagram of a conventional heat transfer device.

[Explanation of symbols]

 (6) Driving force generation circuit (7) User side circuit (30) Controller (31) Main switching controller (32) Auxiliary switching controller (111) First pressurized solenoid valve (112) Second pressurized solenoid valve ( 113) Auxiliary pressurizing solenoid valve (114) First depressurizing solenoid valve (115) Second depressurizing solenoid valve (116) Auxiliary depressurizing solenoid valve (131) Pressurizing heat exchanger (141) First tank (142) Second tank (143) Auxiliary tank (150) Decompression heat exchanger (158) Main heat exchanger (M1) Main switching means (M2) Auxiliary switching means

Claims (20)

[Claims] A driving force generating circuit (6) for generating a driving force for transporting a refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). The driving force generation circuit is carried by conveying the refrigerant supplied from 6) in the use side circuit (7).
(6) a heat transfer device, wherein the driving force generation circuit (6) includes a gas inlet and a liquid outlet, and first and second tanks (141, 142) for storing a liquid refrigerant; A pressure heat exchanger (131) that generates a high pressure by heating the refrigerant, a decompression heat exchanger (150) that generates a low pressure by cooling the refrigerant, and the first tank (141). A pressurized tank that communicates with the pressure heat exchanger (131) to extrude the liquid refrigerant,
A first communication state in which the tank (142) is communicated with the vacuum heat exchanger (150) to form a vacuum tank for sucking a liquid refrigerant;
A tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger.
Main switching means (M1) for alternately switching between a second communication state in which the tank is connected to the pressure reducing tank (150) and a capacity control means (20) for adjusting the heat transfer capacity; (141, 142) the main switching control means (31) for switching the main switching means (M1) at predetermined intervals equal to the cycle in which the smaller capacity tank repeats the saturated filling state and the empty state during the maximum capacity operation. Heat transfer equipment provided. 2. A driving force generating circuit (6) for generating a driving force for transporting a refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). The driving force generation circuit is carried by conveying the refrigerant supplied from 6) in the use side circuit (7).
(6) a heat transfer device, wherein the driving force generation circuit (6) includes a gas inlet and a liquid outlet, and first and second tanks (141, 142) for storing a liquid refrigerant; A pressure heat exchanger (131) that generates a high pressure by heating the refrigerant, a decompression heat exchanger (150) that generates a low pressure by cooling the refrigerant, and the first tank (141). A pressurized tank that communicates with the pressure heat exchanger (131) to extrude the liquid refrigerant,
A first communication state in which the tank (142) is communicated with the vacuum heat exchanger (150) to form a vacuum tank for sucking a liquid refrigerant;
A tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger.
Main switching means (M1) for alternately switching between a second communication state in which the heat transfer capacity is reduced by communicating with the heat transfer capacity (150); a capacity control means (20) for adjusting the heat transfer capacity; Main switching control means (3) for switching the main switching means (M1) at predetermined intervals set in stages in accordance with
1) A heat transfer device comprising: 3. A driving force generating circuit (6) for generating a driving force for transporting a refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). The driving force generation circuit is carried by conveying the refrigerant supplied from 6) in the use side circuit (7).
(6) a heat transfer device, wherein the driving force generation circuit (6) includes a gas inlet and a liquid outlet, and first and second tanks (141, 142) for storing a liquid refrigerant; A pressure heat exchanger (131) that generates a high pressure by heating the refrigerant, a decompression heat exchanger (150) that generates a low pressure by cooling the refrigerant, and the first tank (141). A pressurized tank that communicates with the pressure heat exchanger (131) to extrude the liquid refrigerant,
A first communication state in which the tank (142) is communicated with the vacuum heat exchanger (150) to form a vacuum tank for sucking a liquid refrigerant;
A tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger.
A main switching means (M1) for alternately switching between a second communication state communicating with (150) and forming a pressure reducing tank, and a refrigerant supply amount to the use side circuit (7) or a refrigerant from the use side circuit (7). Refrigerant amount detecting means (27) for detecting the recovered amount is provided, and the main switching means (M1) while changing a switching cycle based on the refrigerant supply amount or the refrigerant recovered amount detected by the refrigerant amount detecting means (27). A heat transfer device including a main switching control means (31) for switching between (1) and (2). 4. A driving force generating circuit (6) for generating a driving force for transporting a refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). The driving force generation circuit is carried by conveying the refrigerant supplied from 6) in the use side circuit (7).
(6) a heat transfer device, wherein the driving force generation circuit (6) includes a gas inlet and a liquid outlet, and first and second tanks (141, 142) for storing a liquid refrigerant; A pressure heat exchanger (131) that generates a high pressure by heating the refrigerant, a decompression heat exchanger (150) that generates a low pressure by cooling the refrigerant, and the first tank (141). A pressurized tank that communicates with the pressure heat exchanger (131) to extrude the liquid refrigerant,
A first communication state in which the tank (142) is communicated with the vacuum heat exchanger (150) to form a vacuum tank for sucking a liquid refrigerant;
A tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger.
(150) a main switching means (M1) for alternately switching between a second communication state in which a pressure reducing tank is formed and a second communication state, and a second communication state for detecting an empty state of the liquid refrigerant in the first and second tanks (141, 142). First and second empty detection means (21, 22) are provided, and when the first tank (141) receives a detection signal from the first empty detection means (21), the first tank (141) sucks the liquid refrigerant. While the switching means (M1) is switched from the first communication state to the second communication state, when receiving the detection signal from the second empty detection means (22), the second tank (142) sucks the liquid refrigerant. Thus, the heat transfer device including the main switching control means (31) for switching the main switching means (M1) from the second communication state to the first communication state. 5. A driving force generating circuit (6) for generating a driving force for transporting a refrigerant, and a use side circuit (7) having a heat source and a use side heat exchanger (5). A heat transfer device for transferring the refrigerant supplied from 6) in the use side circuit (7) and recovering the refrigerant in the driving force generation circuit (6), wherein the driving force generation circuit (6) includes A liquid inlet / outlet is formed, and first and second tanks (141, 142) for storing a liquid refrigerant, a pressurized heat exchanger (131) for generating a high pressure by heating the refrigerant, and a low pressure for cooling the refrigerant. A decompression heat exchanger (150) for generating pressure; and a pressure tank for extruding liquid refrigerant by connecting the first tank (141) to the pressure heat exchanger (131).
A first communication state in which the tank (142) is communicated with the vacuum heat exchanger (150) to form a vacuum tank for sucking a liquid refrigerant;
A tank (142) is connected to the pressurized heat exchanger (131) to form a pressurized tank, and the first tank (141) is connected to the decompressed heat exchanger.
A main switching means (M1) for alternately switching between a second communication state in which the first and second tanks (141, 142) are communicated with the (150) and a second communication state for forming a pressure reducing tank, and an overfill state of the liquid refrigerant in the first and second tanks (141, 142) is detected. The first and second overfill detection means (24,
25), and upon receiving a detection signal from the first overfill detection means (24), the main switching means (M1) is set to the second tank so that the first tank (141) pushes out the liquid refrigerant. While switching from the communicating state to the first communicating state, when receiving the detection signal from the second overfill detecting means (25), the main switching means (M1) is so pressed that the second tank (142) pushes out the liquid refrigerant. ) From the first communication state to the second communication state.
1) Heat transfer device equipped. The driving force generating circuit (6) has a gas inlet / outlet and a liquid inlet / outlet, and is provided with a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced pressure heat exchanger (150), and auxiliary switching means (M2) for switching between a liquid line of a circuit and a replenishing state in which liquid refrigerant is sucked into the auxiliary tank (143) is provided. M1) is provided with auxiliary switching control means (32) for switching in conjunction with the main switching means (M1).
5. The heat transfer device according to any one of 5. The driving force generating circuit (6) has a gas port and a liquid port, and has a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced pressure heat exchanger (150), and auxiliary switching means (M2) for switching between a liquid line of a circuit and a replenishing state in which liquid refrigerant is sucked into the auxiliary tank (143) is provided.Main switching means (M1 The heat transfer device according to any one of claims 1 to 5, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) at a cycle longer than the switching cycle of (1). 8. A driving force generating circuit (6) is provided with a gas inlet and a liquid outlet and a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced pressure heat exchanger (150), and auxiliary switching means (M2) for switching between a liquid line of a circuit and a replenishing state in which liquid refrigerant is sucked into the auxiliary tank (143) is provided.Main switching means (M1 The heat transfer device according to any one of claims 1 to 5, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) at a cycle shorter than the switching cycle of (1). 9. A driving force generating circuit (6) is provided with a gas inlet and a liquid outlet and a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced pressure heat exchanger (150), and auxiliary switching means (M2) for switching between a liquid line of a circuit and a replenishing state in which liquid refrigerant is sucked into the auxiliary tank (143) is provided.Main switching means (M1 The heat transfer device according to any one of claims 1 to 5, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) from the supply state to the supply state at a time different from the switching time of (1). . The driving force generating circuit (6) has a gas port and a liquid port, and has a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And an auxiliary switching means (M2) for switching between a supply state in which liquid refrigerant is sucked into the auxiliary tank (143) from the liquid line of the circuit by communicating the pressure reducing heat exchanger (150) with the auxiliary tank (143). The heat transfer device according to any one of claims 1 to 5, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) so that the time is longer than the duration of the supply state. . 11. The heat transfer device according to claim 7, wherein the auxiliary switching control means (32) switches the auxiliary switching means (M2) at predetermined intervals. . The driving force generating circuit (6) has a gas port and a liquid port, and has a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And an auxiliary switching means (M2) for switching between a supply state in which the liquid refrigerant is sucked from the liquid line of the circuit into the auxiliary tank (143), and an auxiliary switching means (M2) for communicating with the pressure reducing heat exchanger (150). Auxiliary switching control means for switching the auxiliary switching means (M2) at predetermined intervals set stepwise according to
The heat transfer device according to any one of claims 1 to 5, further comprising (32). 13. A driving force generating circuit (6) is provided with a gas port and a liquid port, and includes a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And an auxiliary switching means (M2) for switching between a replenishing state where liquid refrigerant is sucked into the auxiliary tank (143) from the liquid line of the circuit by communicating with the pressure reducing heat exchanger (150). A) a refrigerant amount detecting means (27) for detecting a refrigerant supply amount to the refrigerant circuit or a refrigerant recovery amount from the utilization side circuit (7); and a refrigerant supply amount or a refrigerant recovery amount detected by the refrigerant amount detection means (27). The heat transfer device according to any one of claims 1, 2, 4 and 5, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) while changing the switching cycle. The driving force generating circuit (6) has a gas port and a liquid port, and includes a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced pressure heat exchanger (150), and auxiliary switching means (M2) for switching between a liquid line of a circuit and a replenishment state in which liquid refrigerant is sucked into the auxiliary tank (143) is provided. The heat transfer according to claim 3, further comprising auxiliary switching control means (32) for switching the auxiliary switching means (M2) while changing the switching cycle based on the detected refrigerant supply amount or refrigerant recovery amount detected in (27). apparatus. The driving force generating circuit (6) has a gas port and a liquid port, and is provided with a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced-pressure heat exchanger (150), and an auxiliary switching means (M2) for switching between a replenishing state where liquid refrigerant is sucked from the liquid line of the circuit into the auxiliary tank (143); The third to detect the empty state of the refrigerant
Empty detection means (23), and an auxiliary switching control means (32) for switching the auxiliary switching means (M2) to a replenishing state when receiving a detection signal from the third empty detection means (23). The heat transfer device according to claim 1. The driving force generation circuit (6) has a gas port and a liquid port, and has a pressurized heat exchanger (1).
The auxiliary tank (143) installed at a higher position than the auxiliary tank (143) communicates with the auxiliary tank (143) and the pressurized heat exchanger (131) through the gas inlet / outlet. Supply state of supplying the liquid refrigerant in the pressurized heat exchanger (131) through the liquid port, and the auxiliary tank (143) through the gas port.
And a reduced-pressure heat exchanger (150), and an auxiliary switching means (M2) for switching between a replenishing state where liquid refrigerant is sucked from the liquid line of the circuit into the auxiliary tank (143); A third overfill detection means (26) for detecting an overfill state of the refrigerant; and when the detection signal from the third overfill detection means (26) is received, the auxiliary switching means (M2) is set to a supply state. The heat transfer device according to any one of claims 1 to 5, further comprising auxiliary switching control means (32) for switching. 17. The empty detecting means includes a tank (141, 142, 143).
15. The heat transfer device according to claim 4, wherein the heat transfer device is configured by a liquid pipe (36) connected to the liquid inlet / outlet or a temperature sensor (21 a, 21 b) provided at a lower part of the tank. 18. The empty detecting means includes a tank (141, 142, 143).
The heat transfer device according to any one of claims 4 and 14, wherein the heat transfer device is configured by a liquid level sensor (27a, 27b) for detecting a liquid level of the liquid refrigerant in the inside. 19. An overfill detecting means includes a tank (141, 142, 1).
The heat transfer device according to any one of claims 5 and 15, comprising a gas pipe (37) connected to the gas inlet / outlet of (43) or a temperature sensor (22a, 22b) provided at an upper part of the tank. 20. The heat transfer device according to claim 5, wherein the overfill detection means comprises a liquid level sensor (27a, 27b) for detecting a liquid level of the liquid refrigerant in the tank. apparatus.