JPH07174423A - Heat accumulation air-conditioning device - Google Patents

Abstract

PURPOSE:To provide a heat accumulation air-conditioning device which is constituted to output approximately constant heat dispersion (cold dispersion) without being influenced by refrigerant pump-drive operation on the temperature, feed maximum capacity on condition that a heating (cooling) load is high, and perform operation in good working condition at a current time. CONSTITUTION:In, for example, heat dispersion operation by a refrigerant gas pump 13, the temperature of heat accumulating medium 7 previously heat-accumulated in a heat accumulating tank 8 is detected by a temperature detecting device 35. A control device 27 is caused to release a first opening closing device 30 of a first bypass circuit 28 connected between a piping 21a on the liquid side of a circuit 21 for cold dispersion and heat dispersion and the suction pipe of a refrigerant gas pump 13 when it is judged that the temperature of the heat accumulating medium 7 is high, i.e., high heating capacity is fed and regulate the condensing pressure of a refrigerant to a preset value by bypass of a liquid refrigerant to the suction piping of the refrigerant gas pump l and control capacity to a given value. When heat energy of the heat accumulating tank 8 is consumed owing to continuance of operation and the temperature of the heat accumulating medium 7 is lowered, the first opening/closing device 30 is rapidly closed to prevent lowering of heating capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type air conditioner provided with a heat storage tank containing a heat storage medium and capable of contributing to suppression of daytime power consumption and leveling of power consumption.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, Japanese Patent Laid-Open No. 2-33573.
FIG. 6 is a refrigerant piping system diagram showing a circuit configuration of a conventional heat storage type air conditioner disclosed in Japanese Patent Publication No. The circuit shown in the figure is
A main refrigerant circuit 6 formed by sequentially connecting a compressor 1, a non-use side heat exchanger 2 which is a condenser, a first pressure reducing mechanism 3, and a use side heat exchanger 4 which is an evaporator, and a heat storage medium capable of storing heat. The non-use side heat exchanger 2 to the first decompression mechanism 3 via the heat storage tank 8 containing 7 and the heat exchanger 9a for cold storage which exchanges heat between the heat storage medium 7 of the heat storage tank 8 and the refrigerant. A bypass circuit 10 that enables the movement of the refrigerant between the liquid-side pipe 5a and the gas-side pipe 5b, a second pressure reducing mechanism 11 provided in the liquid-side pipe 10a of the bypass circuit 10, and the bypass circuit. Bypass circuit 1 which is connected in parallel to the gas side pipe 10b of 10
2 and the heat storage tank 8 provided in the bypass circuit 12
Refrigerant gas pump (refrigerant pump) 13 that circulates the refrigerant in order to exchange heat between the heat storage medium 7 and the refrigerant stored in
And an opening / closing device 14 that controls the amount of refrigerant flowing into the bypass circuit 12.

Next, the operation of this conventional device will be described. Each of the devices denoted by reference numerals 1 to 4 is made to be able to circulate a refrigerant through a refrigerant pipe 5, and is obtained from each of these devices by heat exchange with outdoor air in a non-use side heat exchanger 2. The use-side heat exchanger 4 constitutes the main refrigerant circuit 6 that applies, for example, indoor air to the cold heat.

During a normal cooling operation using a compressor (hereinafter referred to as a general cooling operation), the operation is performed with the second decompression mechanism 11 fully closed, and the refrigerant is only in the main refrigerant circuit 6. Circulate. That is, the high-temperature high-pressure gaseous refrigerant discharged from the compressor 1 is condensed in the non-use side heat exchanger 2 and adiabatically expanded in the first pressure reducing mechanism 3 to become a low-temperature gas-liquid two-phase flow. After that, the heat flows into the heat exchanger 4 on the use side, where heat is taken from the surrounding air to cool the surroundings, and the heat is evaporated and vaporized by the compressor 1 itself.
Circulate back to. Further, during a cold storage operation in which cold heat is stored in the heat storage tank 8 (hereinafter, referred to as a cold storage operation) by utilizing a nighttime time period when the power load is small, the operation is performed with the first pressure reducing mechanism 3 fully closed. Done. That is, the gaseous refrigerant discharged from the compressor 1 is condensed in the non-use side heat exchanger 2 to become a liquid refrigerant, flows into the bypass circuit 10, and adiabatically expands in the second pressure reducing mechanism 11, The heat exchanger 9a for cold storage heat evaporates and vaporizes and stores cold heat in the heat storage medium 7 in the heat storage tank 8. The evaporated refrigerant returns to the compressor 1 through the open / close device 14 and the refrigerant pipe 5.

During the nighttime, the cold heat stored in the heat storage tank 8 in advance is used, for example, during the daytime to use the cold heat storage cooling operation (hereinafter referred to as "cooling operation") to stop the compressor 1 and open / close the switch 14. When the refrigerant gas pump 13 is operated in the closed state, the low-temperature low-pressure gas refrigerant boosted by the refrigerant gas pump 13 is supplied to the gas side pipe 10 of the bypass circuit 10.
After passing through b, it enters the heat exchanger 9a for cold heat storage and gives heat to the heat storage medium 7, so that it condenses and liquefies itself. Then, the condensed and liquefied refrigerant adiabatically expands in the second decompression mechanism 11, becomes a low-temperature gas-liquid two-phase fluid, and flows into the utilization side heat exchanger 4, where heat is taken from ambient air. By cooling the surroundings,
It itself evaporates and vaporizes, and returns to the refrigerant gas pump 13 again through the gas side pipe 5b and the bypass circuit 12. Further, according to this conventional device, the general cooling operation and the cooling operation by the operation of the compressor 1 can be simultaneously performed. That is, the operation is performed with both the compressor 1 and the refrigerant gas pump 13 operating, and the non-use side heat exchanger 2 of the main refrigerant circuit 6 is operated.
The refrigerant condensed in 1. and the refrigerant condensed in the heat storage heat exchanger 9a of the bypass circuit 10 are connected to the liquid side pipe 5 of the main refrigerant circuit 6.
They are merged at a, and both are circulated so as to cool the surroundings by evaporating at the utilization side heat exchanger 4 through the first pressure reducing mechanism 3.

The compressor 1 and the refrigerant gas pump 1 shown above
The simultaneous operation of No. 3, that is, the mixed operation of the general cooling operation and the cooling operation, effectively acts as a load reduction measure for the daytime power demand, but if the circuit configuration of this conventional device is used, the cooling operation is performed. Thus, when the cold energy stored as sensible heat in the heat storage tank 8 is consumed at night and the temperature of the heat storage medium 7 rises, the cooling capacity decreases due to the rise in the refrigerant condensation temperature regardless of the air conditioning load required. Therefore, it becomes impossible to supply a constant cooling capacity, and since the refrigerant circulation flow rate decreases, the refrigerant becomes excessive and the high pressure rises,
There are problems such as liquid backing to the refrigerant gas pump 13 that directly damages the components that make up the refrigerant circuit. Further, as described above, the change in the refrigerant condensing temperature in the cooling circuit causes the refrigerant condensed in the condenser 2 and the heat exchanger 9a for cold storage to join together as in the conventional device,
It also affects the condensing pressure of the compressor 1 and causes a decrease in the refrigerant circulation amount and capacity. Therefore, as a solution to the above problems, an operating capacity control mechanism of the refrigerant gas pump 13 and an inverter control of an indoor blower motor that are suitable for an air conditioning load can be considered, but the cost of manufacturing the device is forced to be high. It cannot be said that this is an effective means for application to actual equipment.

[0007]

Since the conventional heat storage type air conditioner is configured as described above, it is possible to perform the stand-alone operation of the cooling operation or the simultaneous combined operation of the cooling operation and the general cooling operation. At this time, due to the temperature change of the heat storage medium 7, not only the cooling capacity is reduced and the required capacity cannot be supplied, but also the refrigerant amount in the circuit becomes excessive due to the decrease in the refrigerant circulation amount, and the refrigerant gas pump 13 and the compressor 1 There was a problem such as a liquid bag that interferes with continuous operation. Such a problem is the same in the case where the refrigerant circuit of the conventional device adopts a so-called heat pump type configuration in which the refrigerant circulation direction is reversed and the heating operation and the heat storage operation can be switched by the configuration. It is possible that In particular, this problem becomes remarkable when the heat energy is stored in the heat storage tank 8 at a high temperature in the winter.

During the heat radiation operation by the cooling / radiating circuit, at the start of the operation when the heat storage medium 7 is in a high temperature state, it is possible to supply a heating capacity which is a predetermined value or higher. However, the heat energy stored in the heat storage tank 8 is consumed as the evaporation energy of the heat radiation operation cycle,
As the temperature of the heat storage medium 7 decreases, the evaporation temperature decreases, so that the heating capacity significantly decreases and the supply capacity becomes insufficient. Therefore, it is conceivable that if the temperature in the heat storage tank 8 is lowered, the required heating capacity cannot be supplied even when the heating load is increased. Further, since most of the heat storage amount is consumed when the operation is started up, there is a problem that a state below the predetermined capacity is forced for a long time in the subsequent operation.

Further, not only the capacity is lowered as described above, but also the required refrigerant flow rate is reduced, so that the refrigerant in the refrigerant circuit becomes excessive, and liquid compression in the refrigerant gas pump 13 and refrigeration from the refrigerant gas pump 13 are performed. There was a problem that the amount of machine oil taken out increased and the continuation of operation was hindered due to a failure due to seizure of the pump bearing.

The present invention has been made in order to solve the above-mentioned problems, and uses the cold power and the cold energy stored in the heat storage tank at night to save the heat and cool the heat.
When performing heat dissipation operation, it is possible to stably supply a certain capacity without being affected by the temperature of the heat storage medium, and by supplying the cooling and heating capacity according to the air conditioning load at that time, the maximum capacity is supplied at the peak of the load. In addition, during cooling and heat radiation operation,
It is an object of the present invention to provide a heat storage type air conditioner having an inexpensive structure that can continue stable operation without trouble such as liquid backing due to excess refrigerant due to changes in the amount of circulating refrigerant and depletion of refrigerating machine oil.

[0011]

In order to achieve the above object, a heat storage type air conditioner according to the present invention comprises a refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a heat exchange on the use side. Via a four-way switching valve to switch the cooling medium flow path through the heat exchanger on the utilization side by switching the refrigerant flow path of the four-way switching valve A heat storage tank having a built-in heat storage medium for storing and releasing heat or releasing and releasing heat, and a first switchgear connected between the liquid side pipe of the cooling and releasing circuit and the suction pipe of the refrigerant pump. The first bypass circuit consisting of, the cold storage heat temperature detection device for detecting the temperature of the heat storage medium provided in the heat storage tank, and the heat exchanger for cold storage heat and the heat exchanger for use on the side of the cold storage heat storage medium for storing the heat storage medium in advance. When performing cooling and heat dissipation operation by
A first control device for controlling the opening / closing of the first opening / closing device based on the heat storage medium temperature detected by the cold storage heat temperature detecting device.

Further, a refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchanger is switched by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage tank that contains a heat storage medium that stores and stores heat or cools and releases heat via a heat storage heat exchanger A first bypass circuit connected between the liquid side pipe of the working circuit and the suction pipe of the refrigerant pump and having a first opening / closing device; and a load amount detecting device for detecting the operating load amount of the refrigerant pump, When performing cooling / radiating operation via the heat exchanger for cold storage and the heat exchanger on the use side for the heat storage medium that has previously stored cold / heat, the operating load of the refrigerant pump detected by the load detector Second control for controlling opening / closing of the first opening / closing device based on It is those formed by and a location.

Further, a refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchanger is switched by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage tank that has a built-in heat storage medium that stores and stores heat or cools and releases heat via a heat storage heat exchanger.
Secondly connected between the discharge pipe and the suction pipe of the refrigerant pump.
Second bypass circuit having an opening / closing device, a cold storage heat temperature detecting device provided in the heat storage tank for detecting the temperature of the heat storage medium, a heat exchanger for cold storage heat for a heat storage medium that has been previously cold stored / stored, and And a third control device for controlling opening / closing of the second switch device based on the heat storage medium temperature detected by the cool heat storage temperature detection device when performing cooling / radiating operation via the use side heat exchanger. It will be done.

The refrigerant pump, the four-way switching valve, the heat exchanger for cold storage heat, the pressure reducing mechanism, and the usage-side heat exchanger are sequentially connected, and the usage-side heat exchanger is switched by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage / heat storage heat exchanger
A heat storage tank containing a heat storage medium for storing heat or releasing and radiating heat; a second bypass circuit having a second opening / closing device connected between the discharge pipe and the suction pipe of the refrigerant pump; When performing a cooling / radiating operation through a load amount detection device that detects an operating load amount, and a heat storage medium for heat storage and a heat storage medium for heat storage for a heat storage medium that has been stored in advance in advance,
A fourth control device for controlling the opening / closing of the second opening / closing device based on the operating load amount of the refrigerant pump detected by the load amount detecting device.

Further, a refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchanger is switched by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage tank that contains a heat storage medium that stores and stores heat or cools and releases heat via a heat storage heat exchanger A first bypass circuit connected between the liquid side pipe of the working circuit and the suction pipe of the refrigerant pump and having a first switchgear; and a first bypass circuit connected between the discharge pipe and the suction pipe of the refrigerant pump. A second bypass circuit having two opening / closing devices, a cold storage heat temperature detecting device provided in the heat storage tank for detecting the temperature of the heat storage medium, and a refrigerant state for detecting the degree of superheat of the refrigerant in the suction pipe of the refrigerant pump. The detector and the heat storage medium that has previously stored heat While performing the cooling / radiating operation via the heat exchanger for cold storage and the heat exchanger on the use side, the opening / closing control of the first opening / closing device is performed based on the heat storage medium temperature detected by the cold storage heat temperature detection device. A fifth control device for controlling the opening / closing of the second opening / closing device based on the degree of superheat detected by the refrigerant state detecting device when the first opening / closing device is opened.

A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a decompression mechanism with a variable opening degree, and a heat exchanger on the use side are sequentially connected. A heat releasing / radiating circuit that freely switches between cooling and heating via a heat exchanger, and a heat storage tank that has a built-in heat storage medium that performs cool storage / heat storage or heat discharging / radiating via the heat storage heat exchanger, A first bypass circuit, which is connected between the liquid side pipe of the cooling / radiating circuit and the suction pipe of the refrigerant pump, and has a first opening / closing device, and the heat storage medium temperature provided in the heat storage tank are detected. Cooled heat temperature detection device, a refrigerant state detection device for detecting the degree of superheat of the refrigerant in the suction pipe of the refrigerant pump,
Based on the temperature of the heat storage medium detected by the cool heat storage temperature detection device when performing heat discharge / heat radiation operation via the heat storage for heat storage and heat exchanger for use on the side A sixth control device for controlling the opening / closing of the first opening / closing device, and controlling the pressure reducing mechanism based on the degree of superheat detected by the refrigerant state detecting device when the first opening / closing device is opened. Is.

[0017]

In the heat storage type air conditioner according to the present invention, the temperature of the heat storage medium in the heat storage tank is detected by the cool heat storage temperature detecting device during the heat radiation (cooling) operation by driving the refrigerant pump.
Then, when the first control device determines that the temperature of the heat storage medium is high (low), that is, a significantly large heating (cooling) capacity is being supplied, the liquid side pipe of the cooling / radiating circuit and the refrigerant pump. Open the first opening / closing device of the first bypass circuit connected between the suction pipe and the suction pipe, and bypass the liquid refrigerant in the liquid side pipe to the suction pipe to set the condensation pressure of the refrigerant to a preset condensation pressure. It is adjusted so as to obtain a predetermined ability. Further, when the heat (cold heat) energy of the heat storage tank is consumed by the heat radiation (cooling) operation and the temperature of the heat storage medium is lowered (increased), the first switchgear is promptly closed to remove the liquid refrigerant. Stop bypassing to prevent loss of capacity. In this way, by controlling the first switchgear using the temperature of the heat storage medium as a parameter, the capacity is leveled, and the daily supply capacity is stably supplied for a long time on average.

Further, heat dissipation (cooling) by driving the refrigerant pump
During operation, the operation load amount of the refrigerant pump is detected by the load amount detection device. Then, when the second control device determines that the operating load is high, that is, the capacity that is significantly larger than the predetermined capacity is being supplied, the second controller controls the liquid side piping of the cooling / radiating circuit and the suction piping of the refrigerant pump. The first switchgear of the first bypass circuit connected between them is opened to bypass the liquid refrigerant to the suction side of the refrigerant pump, and the operation load amount of the refrigerant pump becomes a preset load to supply a predetermined capacity. Control the ability to suppress. Further, when the operation load amount decreases due to the continuation of the heat radiation (cooling) operation and the heating (cooling) capacity decreases, the first opening / closing device is promptly closed and the capacity of the liquid refrigerant bypass Prevent the decline. By controlling the capacity of this refrigerant pump operating load as a parameter, the refrigerant condensing pressure is controlled even when the operating load is high, for example, when the indoor intake air temperature is high (low) and the required heating (cooling) load is relatively low. Then, the ability is suppressed and the consumption of heat (cold heat) energy is suppressed. On the contrary, when the required heating (cooling) load is large, the capacity is not suppressed and the maximum capacity at that time is exhibited.

Further, heat dissipation (cooling) by driving the refrigerant pump
During operation, the temperature of the heat storage medium is detected by the cool heat storage temperature detection device in the heat storage tank. And the third control device
When it is determined that the heat storage medium temperature is high (low) and the heating (cooling) capacity is significantly high, the second bypass circuit of the second bypass circuit connected between the discharge pipe and the suction pipe of the refrigerant pump is connected. The switchgear is opened to reduce the refrigerant circulation flow rate in the main circuit of the cooling / radiating circuit to suppress the supply of more than a predetermined capacity. When the heat (cooling) energy of the heat storage tank is consumed by the heat radiation (cooling) operation and the temperature of the heat storage medium decreases (rises), the second switchgear is immediately closed to increase the capacity supply. Let By controlling the heat storage medium temperature as a parameter, the supply capacity is kept constant and the capacity is leveled, so that the supply capacity of one day is averaged and stable supply is performed for a long time.

During the heat radiation (cooling) operation by driving the refrigerant pump, the operation load amount of the refrigerant pump is detected by the load amount detecting device. Then, when the fourth control device determines that the operation load amount of the refrigerant pump is high, that is, the capacity equal to or higher than the predetermined capacity is supplied, the fourth control device is connected between the discharge pipe and the suction pipe of the refrigerant pump. The second opening / closing device of the second bypass circuit is opened to reduce the refrigerant circulation flow rate in the main circuit of the cooling / radiating circuit to suppress it to a predetermined capacity. Further, when the operating load of the refrigerant pump decreases, the second switchgear is immediately closed. When the operating load is high, that is, when the required heating (cooling) load is relatively low, the consumption of heat (cooling) energy in the heat storage tank is suppressed by the control using the operating load of the refrigerant pump as a parameter. On the contrary, when the required heating (cooling) load is large, the maximum capacity is supplied. By this capacity control, when the load is small, the supply capacity is suppressed to save the heat (cold heat) energy of the heat storage tank, and the maximum capacity is supplied at the peak of the load.

Further, heat radiation (cooling) by driving a refrigerant pump
During operation, the fifth control device opens the first opening / closing device of the first bypass circuit connected between the liquid side pipe and the suction pipe of the refrigerant pump for capacity adjustment to bypass the refrigerant, At that time, since the liquid refrigerant from the liquid side pipe is directly bypassed to the suction side of the refrigerant pump, there is a possibility that the refrigerant pump may malfunction due to liquid compression. Therefore, the fifth control device opens the first switchgear and simultaneously opens the second switchgear of the second bypass circuit to open the high-temperature high-pressure system that bypasses the refrigerant pump from the discharge side to the suction side. Using the gas refrigerant of No. 3, the degree of superheat of the refrigerant on the suction side is increased to the extent that the liquid refrigerant from the first bypass is superheated and evaporated. As a result, liquid backing to the refrigerant pump is prevented, and stable and stable operation is continued.

Further, heat dissipation (cooling) by driving the refrigerant pump
During operation, when the sixth control device bypasses the refrigerant through the first bypass circuit connected between the liquid side pipe and the suction pipe of the refrigerant pump for capacity adjustment, the liquid refrigerant from the liquid side pipe Is directly bypassed to the suction side of the refrigerant pump, which may cause a failure of the refrigerant pump due to liquid compression. Therefore, the sixth control device, when the first opening / closing device is opened, makes the throttle adjustment of the refrigerant by the pressure reducing mechanism arranged on the upstream side in the refrigerant circulation direction of the liquid side pipe slightly throttle, and causes the refrigerant pump suction side. The degree of superheat on the suction side is increased to such an extent that the refrigerant becomes a gas state. As a result, liquid backing to the refrigerant pump is prevented, and stable and stable operation is continued.

[0023]

【Example】

Example 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a refrigerant piping system diagram showing an overall configuration of a heat storage type air conditioner according to Embodiments 1 and 2 to which Claims 1 and 2 are applied. In the figure, 1 is a compressor,
2 is a non-use side heat exchanger that exchanges heat between outdoor air and a refrigerant, 3 is a first pressure reducing mechanism, 4a is a first use side heat exchanger, and 17 is a first accumulator. , And these are sequentially connected to form a compressor-use cooling / heating circuit (hereinafter, referred to as a general cooling / heating circuit) 18, and, for example, cooling or heating of a room is performed via the first use-side heat exchanger 4a. I am supposed to do it. The general cooling and heating circuit 18 is connected to the first usage-side heat exchanger 4a and is arranged in parallel with the bypass circuit 16b including the switchgear 16a, and the third pressure reducing mechanism 16 and the first pressure reducing mechanism. By-pass circuit 3b including switchgear 3a connected in parallel to the inlet and outlet sides of 3
It has and.

On the other hand, 13 is a refrigerant gas pump, 9 is a heat exchanger for cold storage heat, 20 is a second pressure reducing mechanism, 4b is a second utilization side heat exchanger, and 13a is a second accumulator.
These are connected in sequence to form a cooling / heating circuit (hereinafter, referred to as a cooling / radiating circuit) 21 that uses cold storage heat, and the above-mentioned second
For example, the room is cooled or heated via the utilization side heat exchanger 4b. Further, 7 is a heat storage medium for storing or storing heat via the heat exchanger 9 for heat storage for cold storage, and 8 is a heat storage tank containing the heat storage medium 7 therein. As the heat storage medium 7, for example, water is used. As the heat storage means in this case, most of the cold heat is stored as latent heat by ice making at the time of cold storage, and at the time of heat storage, it is sufficient to start up until a steady heating operation is reached. It is realized by storing the amount of sensible heat as hot water. Further, 11 is a fourth pressure reducing mechanism which is connected to the second usage-side heat exchanger 4b and has a bypass circuit 11b including the switchgear 11a in parallel. The second decompression mechanism 20 is configured such that a bypass circuit 20b including an opening / closing device 20a is connected in parallel on the inlet / outlet side thereof. In addition, the first usage-side heat exchanger 4a and the second usage-side heat exchanger 4 described above.
b is provided in each independent refrigerant circuit,
Both of them are collectively referred to as a utilization side heat exchanger 4, but the respective heat exchange portions may be provided in either a common air passage or an individually independent air passage.

Reference numeral 22 denotes a first gas side pipe 18b between the first four-way switching valve 15 and the first utilization side heat exchanger 4a and a second four-way switching valve 19 between the second utilization side heat exchanger 4b. It is a bypass circuit that enables the movement of the refrigerant between both circuits by opening and closing the switchgear 22a interposed between the gas side pipe 21b and the gas side pipe 21b.
Reference numeral 23 denotes a first portion between the first pressure reducing mechanism 3 and the third pressure reducing mechanism 16.
By-passing that enables the movement of the refrigerant in both circuits by opening / closing the opening / closing device 23a that is interposed between the liquid side pipe 18a and the second liquid side pipe 21a between the second pressure reducing mechanism 20 and the fourth pressure reducing mechanism 11 Circuit. These bypass circuits 22 and 23
Is used as part of the main refrigerant circuit during cold storage operation or heat storage operation.

Reference numeral 24 is a bypass circuit provided with an opening / closing device 24a in parallel between the inlet and outlet of the refrigerant gas pump circuit including the refrigerant gas pump 13, the second accumulator 13a, and the second four-way switching valve 19. Numerals 25 and 26 are opening / closing devices provided at the inlet and outlet of the refrigerant gas pump circuit, respectively, and 27 is a control device for controlling each operation of the heat storage type air conditioner. Reference numeral 28 denotes a first bypass circuit connected to the second liquid side pipe 21a and the suction pipe of the refrigerant gas pump 13, and has a first opening / closing device 30 and a discharge pressure adjusting valve 29 which are sequentially connected. is doing. Further, 32 is a condensing pressure detection device that is provided in the refrigerant pipe near the second utilization side heat exchanger 4b and that detects the condensing pressure of the refrigerant, and 35 is a temperature that is provided in the heat storage tank 8 and that detects the temperature of the heat storage medium 7. A detection device, 36 is an air temperature detection device that is provided in the air passage of the usage-side heat exchanger 4 and detects the indoor intake air temperature, and 37 is a discharge pressure that is provided in the discharge pipe of the refrigerant gas pump 13 and that detects the discharge pressure of the refrigerant. It is a detection device.

FIG. 2A shows the relationship between the heat storage medium temperature and the opening / closing operation of the first opening / closing device. When the temperature of the heat storage medium 7 is higher than 20 ° C., for example, the first opening / closing device 30 is opened (hereinafter, referred to as ON) to adjust the refrigerant flow rate by controlling the pressure of the discharge pressure adjustment valve 29, and the temperature of the heat storage medium 7 is adjusted. Is lower than 20 ° C., it means that the first switchgear 30 is closed (hereinafter referred to as OFF) to shut off the first bypass circuit 28. Further, FIG. 2B shows how the heat dissipation capacity changes by opening and closing the first switchgear, and the heat storage medium temperature at which the capacity is larger than the predetermined capacity is a predetermined temperature (for example, 20 degrees here). (° C) or higher, the first switchgear 30 is opened to control the pressure to a preset condensing pressure, and the capacity can be suppressed to a predetermined value. On the contrary, when the temperature of the heat storage medium falls below the preset predetermined temperature, the first opening / closing device 30 is closed to prevent the deterioration of the capacity. By controlling the opening and closing of the first switchgear 30 based on the detected temperature of the heat storage medium 7 to supply a constant capacity, the average daily heating and heating capacity is leveled regardless of the temperature of the heat storage medium 7. Can provide the ability.

FIG. 3 shows a control algorithm according to the first embodiment. When the heating operation is started (S1), the temperature T _S of the heat storage medium 7 is detected by the temperature detection device (an example of a cool heat storage temperature detection device) 35 (S2). The control device 27 (first control device) determines whether or not the detected temperature T _S is equal to or higher than a predetermined temperature, determines the opening / closing operation of the first opening / closing device 30 based on the determination result, and outputs a command signal. Output. That is,
If the detected temperature T _S is equal to or higher than the predetermined temperature (T _{S of} S3 ≧ 2
0), the first opening / closing device 30 is opened (S4). Also,
These determination processes are always fed back, and when the temperature of the heat storage medium 7 becomes lower than the predetermined temperature (T _{S in} S3).
<20), the first opening / closing device 30 is closed (S5).

Example 2. Example 2 according to claim 2 of the present invention will be described below. The configuration is the same as the refrigerant circuit configuration according to FIG. 1 as described in the first embodiment.
In the first embodiment, the temperature of the heat storage medium 7 is used as a parameter for the first
Although the opening / closing command of the opening / closing device 30 is determined, in the present embodiment, the operating load amount of the refrigerant gas pump 13 is detected, and the opening / closing determination of the first opening / closing device 30 is performed based on the detected value to adjust the capacity. Is to do. The load amount detecting means for detecting the operation load amount of the refrigerant gas pump 13 includes:
Whether the pressure of the refrigerant is detected by the condensation pressure detection device 32,
Based on these detected values, whether the indoor intake air temperature is detected by the air temperature detection device 36 or the discharge pressure of the refrigerant is detected by the discharge pressure detection device 37 provided in the discharge pipe of the refrigerant gas pump 13 Control device 27
One that controls the opening / closing of the first opening / closing device 30.

FIG. 4A shows the relationship between the condensing pressure detection value, the refrigerant discharge temperature, the room intake air temperature, and the opening / closing operation of the first opening / closing device according to the second embodiment, and FIG. It shows the relationship between the medium temperature, the heating supply capacity, and the refrigerant pressure. When the heating load is small due to the opening / closing control of the first switchgear 30, the capacity can be kept constant without being affected by the temperature of the heat storage medium 7, and the capacity can be maintained if the required supply capacity is small. The amount of heat storage can be saved in preparation for peak load.

FIG. 5 shows a control algorithm according to the second embodiment. When the heat radiation operation is started (S11), the condensation pressure P _c or the like of the refrigerant gas pump 13 is determined by the condensation pressure detection device 32.
Etc. are detected (S12). The control device 27 (second control device) determines that the detected condensation pressure P _c or the refrigerant discharge pressure P _d is, for example, 20 kg / cm ² G or more (S13).
P _c , P _d ≧ 20), and the detected indoor intake air temperature T
_{When a} is 21 ° C. or higher (T _a ≧ 21 in S13),
Alternatively, when the detected refrigerant discharge temperature T _d is, for example, 70 ° C. or higher (T _d ≧ 70 in S13), the first opening / closing device 3
0 is released (S14). Then, this judgment result is always fed back, and the condensing pressure P _c and the discharge pressure P
_{When d} is low (P _c , P _d <20 in S13) or the indoor intake air temperature T _a and the discharge temperature T _d are low (T _a <21, T _d <70 in S13), the first opening / closing device 30 Is closed (S15).

Example 3. FIG. 6 is a refrigerant piping system diagram showing the overall configuration of a heat storage type air conditioner according to Embodiments 3 and 4 to which the inventions of Claims 3 and 4 are applied. In the figure, the same parts as those of the first embodiment shown in FIG. A temperature detection for detecting the temperature of the heat storage medium 7 by providing a second bypass circuit 33 between the discharge pipe and the suction pipe of the refrigerant gas pump 13 of the cooling / radiating circuit 21 via the second opening / closing device 34. A device 35 and a control device 27 that controls the opening / closing of the second opening / closing device 34 based on the temperature of the heat storage medium 7 detected by the temperature detection device 35 are provided.

FIG. 7A shows the relationship between the heat storage medium temperature and the opening / closing operation of the second opening / closing device. When the temperature of the heat storage medium 7 is higher than 20 ° C., the second opening / closing device 34 is opened, and the high-temperature and high-pressure gas refrigerant discharged from the refrigerant gas pump 13 is returned to the pump suction side through the second bypass circuit 33 to be the liquid refrigerant. Is vaporized. On the contrary, if the temperature of the heat storage medium 7 falls below 20 ° C., the second opening / closing device 34 is closed. Further, FIG. 7B shows how the heat radiation capacity changes with changes in the heat storage medium temperature and the indoor intake air temperature. When the temperature of the heat storage medium 7 becomes equal to or higher than a preset predetermined temperature (here, for example, 20 ° C.) at which the capacity becomes larger than the predetermined capacity, the second opening / closing device 34 is opened in advance. The condensing pressure is set and the capacity is suppressed to a predetermined value. This heat storage medium 7
By the opening / closing control of the second opening / closing device 34 based on the detected temperature, the level of the daily supply capacity can be supplied regardless of the temperature of the heat storage medium 7.

FIG. 8 shows a control algorithm according to the third embodiment. When the radiating operation is launched (S21), the temperature T _s of the heat storage medium 7 is detected by the temperature detecting device 35 (S22). The control device 27 (third control device) determines whether or not the detected temperature T _s is equal to or higher than a predetermined temperature, determines the opening / closing operation of the second opening / closing device 34 based on the determination result, and outputs a command signal. Output. That is, if the detected temperature T _s is equal to or higher than the predetermined temperature (T _s ≧ 20 in S23), the second opening / closing device 34 is opened (S24). Further, the result of this determination is always fed back, and when the temperature T _s of the heat storage medium 7 becomes lower than the predetermined temperature (T _s <20 of S23), the second switchgear 34 is closed (S25).

Example 4. Hereinafter, Example 4 according to claim 4
Will be described. The configuration is the same as the refrigerant circuit configuration diagram according to FIG. 6 as described in the third embodiment. In the third embodiment described above, the operation of the second opening / closing device 34 is judged to open / close by using the temperature of the heat storage medium as a parameter, but in the present embodiment, the second opening / closing device 34 is determined based on the detected value of the operating load of the refrigerant gas pump 13. The opening / closing device 34 is opened / closed and the capacity is adjusted by adjusting the refrigerant flow rate. Refrigerant gas pump 13
Of the operation load of the refrigerant gas pump 13 using the condensation pressure detection device 32 or the second liquid side pipe 2
The pressure of 1a or the air conditioning load is detected, and these detected values are transmitted to the control device 27.

FIG. 9 shows the relationship between the indoor intake air temperature and the heat storage medium temperature, the pressure detection value, and the heat radiation capacity according to the fourth embodiment. Based on this relationship, the second opening / closing device 34
By controlling the opening and closing of, not only can the stable supply capacity of the daily supply capacity be supplied irrespective of the temperature of the heat storage medium 7, but also the supply capacity can be suppressed when the air conditioning load is small, and the heat storage amount can be prepared for the peak load. Can be preserved.

FIG. 10 shows a control algorithm according to the fourth embodiment. When the heat radiation operation is started (S31), the condensation pressure P _c and the discharge pressure P _{d of} the refrigerant gas pump 13 are detected by the condensation pressure detection device 32 and the discharge pressure detection device 37 (S32). The control device 27 (fourth control device) controls the detected discharge pressure P _d and condensing pressure P _{c to} be 20 kg / cm.
^In the case of ² G or more (P _d , P _c ≧ 20 in S33), when the detected indoor intake air temperature T _a is 21 ° C. or more (S33
T _a ≧ 21) or the detected discharge temperature T _d is 70
When the temperature is equal to or higher than C (T _d ≧ 70 in S33), the second opening / closing device 34 is opened (S34). Further, this judgment result is always fed back, and when the discharge pressure P _d and the condensing pressure P _c are low (P _{d of} S33, P _c <20) or the indoor intake air temperature Ta and the discharge temperature T _d are low ( S33
T _a <21, T _d <70), the second opening / closing device 34 is closed (S35).

Example 5. FIG. 11 shows a refrigerant circuit configuration of a heat storage type air conditioner according to a fifth embodiment to which the invention of claim 5 is applied. In the figure, the same parts as those of the first embodiment shown in FIG. Reference numeral 33 denotes a second bypass circuit which is provided between the discharge pipe and the suction pipe of the refrigerant gas pump 13 and has a second opening device 34, and 38 is provided in the suction pipe of the refrigerant gas pump 13 and is based on, for example, the refrigerant temperature. It is a refrigerant state detection device that detects the degree of superheat.

FIG. 12 shows a control algorithm according to the fifth embodiment. When the radiating operation is launched (S41), the temperature T _s of the heat storage medium 7 is detected by the temperature detecting device 35 (S42). Control device 27 (fifth control device), based on the temperature T _s of the detected thermal storage medium 7, thereby bypassing the liquid refrigerant to the suction pipe of the refrigerant gas pump 13 from the second liquid side pipe 21a for capacity control Therefore, the first switchgear 30
When the refrigerant is opened (S43 ON), the refrigerant gas pump 1
3 may be liquid-compressed to cause a malfunction in operation.
Therefore, the control device 27 sets the superheat degree based on the refrigerant temperature detected by the refrigerant state detection device 38 to a predetermined superheat degree (condition that the refrigerant on the pump suction side is in the gas state) at the same time when the first opening / closing device 30 is opened. ) As described above, the second switchgear 34 is also adjusted to open (S44, S45), and the high temperature and high pressure refrigerant gas is bypassed to evaporate the liquid refrigerant and avoid the liquid back operation to the refrigerant gas pump 13. Let On the other hand, when the control device 27 determines that it is not necessary to open the first opening / closing device 30, that is, the refrigerant gas pump 1
3 When the refrigerant on the suction side has a predetermined superheat degree or higher (O of S43
FF), the first switching device 30 and the second switching device 34 are closed (S46, S47), and each bypass circuit is shut off.

Example 6. FIG. 11 shows the overall configuration of a heat storage type air conditioner according to a sixth embodiment to which the invention of claim 6 is applied. In the figure, the same parts as those of the first embodiment shown in FIG.

FIG. 13 shows a control algorithm according to the sixth embodiment. When the radiating operation is launched (S51), the temperature T _s of the heat storage medium 7 is detected by the temperature detecting device 35 (S52). The control device 27 (sixth control device) bypasses the liquid refrigerant from the second liquid side pipe 21 a to the suction pipe of the refrigerant gas pump 13 for capacity control based on the detected temperature T _s of the heat storage medium 7. Therefore, the first switchgear 30
When the refrigerant is opened (S53 ON), the refrigerant gas pump 1
3 may be liquid-compressed to cause a malfunction in operation. Therefore, the control device 27 opens the first opening / closing device 30 and, at the same time, increases it based on the degree of superheat of the refrigerant on the suction side of the refrigerant gas pump 13 detected by the refrigerant state detection device 38. Pressure reducing mechanism 11 (an example of pressure reducing mechanism)
Of the high-temperature high-pressure gas refrigerant is bypassed through the first bypass circuit 28 to evaporate the liquid refrigerant and to cool the refrigerant gas pump 1
The liquid back operation to 3 is avoided. On the other hand, the control device 27
When it is determined that it is not necessary to open the first opening / closing device 30 (OFF in S53), the first opening / closing device 30 is closed and the fourth decompression mechanism 11 is throttled so as to reduce the degree of superheat. Control (S56, S57).

In each of the above-described embodiments, an example in which the heat energy stored in advance in the heat storage medium 7 of the heat storage tank 8 is used for the heat radiation operation during heating is shown, but the present invention is not limited thereto. However, the present invention can also be applied to the case where the refrigerant energy stored in advance in the heat storage medium 7 is used for the cooling operation during cooling. However, as the cooling operation in this case, one using sensible heat is preferable. As a heat storage medium,
For example, when water is used, it is preferable to apply it in a temperature range from almost room temperature to 0 ° C.

[0043]

As described above, according to the heat storage type air conditioner of the present invention, the heat storage medium temperature detected by the cool heat storage temperature detecting device is low or high during the cooling / radiating operation by driving the refrigerant pump. In this case, that is, when a significantly large cooling / radiating capacity is supplied, the condensate refrigerant passes through the first bypass circuit so that the first switchgear is opened to reach the preset condensing pressure, and the liquid side pipe is connected. If the energy stored in the heat storage tank is consumed and the temperature of the heat storage medium rises or falls as a result of being bypassed from the intake pipe to the suction pipe or by continuing the cooling / radiating operation, the first switchgear should be promptly opened. By keeping it in a closed state, cooling is leveled throughout the day regardless of changes in the temperature of the heat storage medium.
It has the effect of supplying heat dissipation capability.

Further, in the cooling / radiating operation by driving the refrigerant pump, when the operating load of the refrigerant pump detected by the load amount detecting device is low or high, that is, a significantly large cooling / radiating capacity is supplied. In this case, the condensate refrigerant is bypassed from the liquid side pipe to the suction pipe through the first bypass circuit so that the first switchgear is opened to a preset condensing pressure or the air conditioning load. When the amount is small, by closing the first switchgear, the energy stored in the heat storage tank can be supplied by supplying the leveled cooling / radiating capacity throughout the day regardless of changes in the temperature of the heat storage medium. The effect of being able to supply a large cooling / radiating capacity in response to a large amount of air-conditioning load by keeping it in storage.

Further, during the cooling / radiating operation by driving the refrigerant pump, when the temperature of the heat storage medium in the heat storage tank detected by the cold storage temperature detecting device is low or high, that is, a significantly large cooling / radiating capacity is supplied. In this case, the second switchgear is opened to bypass the high-temperature gas refrigerant through the second bypass circuit from the discharge pipe of the refrigerant pump to the suction pipe to adjust the refrigerant flow rate of the cooling / radiating circuit. If the energy stored in the heat storage tank is consumed and the temperature of the heat storage medium rises or falls due to the continuation of the cooling / radiating operation, promptly close the second switchgear. , The effect of being able to supply the leveled cooling / radiating ability throughout the day regardless of changes in the temperature of the heat storage medium.

During the cooling / radiating operation by driving the refrigerant pump, when the operating load of the refrigerant pump detected by the load amount detecting device is low or high, that is, a significantly large cooling / radiating capacity is supplied. In this case, the second switchgear is opened to bypass the high temperature gas refrigerant from the discharge pipe of the refrigerant pump to the suction pipe through the second bypass circuit to adjust the refrigerant flow rate of the cooling / radiating circuit. Alternatively, if the operating load of the refrigerant pump decreases due to the continuation of the cooling / radiating operation, the second switchgear is immediately closed to level the temperature throughout the day regardless of changes in the heat storage medium temperature. The stored heat in the heat storage tank is preserved by supplying the improved cooling / radiating ability, and when the air conditioning load is large, the large cooling / radiating ability corresponding to it is provided. There is a supply can effect.

During the cooling / radiating operation by driving the refrigerant pump, the opening / closing control of the first opening / closing device is performed based on the heat storage medium temperature detected by the cold storage heat temperature detecting device, so that the liquid refrigerant is in the first bypass circuit. By bypassing from the liquid side pipe to the suction pipe through the through side, it is possible to supply the leveled cooling / radiating ability throughout the day regardless of the change in the temperature of the heat storage medium, and also to provide the second opening / closing device when the opening / closing device is opened.
By opening the second opening / closing device of the bypass circuit, the high temperature gas refrigerant from the discharge piping of the refrigerant pump is returned to the suction piping to evaporate the liquid refrigerant from the liquid side piping, and It is possible to continue stable operation without defects.

Further, during the cooling / radiating operation by driving the refrigerant pump, the opening / closing control of the first opening / closing device is performed based on the temperature of the heat storage medium detected by the cold storage heat temperature detecting device so that the liquid refrigerant is in the first bypass circuit. By bypassing from the liquid side pipe to the suction pipe through the through side, it is possible to supply a leveled cooling / radiating capacity throughout the day regardless of changes in the temperature of the heat storage medium, as well as a refrigerant pump when the first switchgear is opened. By controlling the pressure reducing mechanism between the cold storage heat exchanger and the use side heat exchanger so that the refrigerant in the suction pipe has a superheat degree capable of turning into a gas state, liquid back to the refrigerant pump It is possible to realize stable operation without trouble with an inexpensive configuration.

[Brief description of drawings]

FIG. 1 is a refrigerant piping system diagram of a heat storage type air conditioner according to a first embodiment and a second embodiment of the present invention.

FIG. 2A is a diagram showing an example of the relationship between the temperature of the heat storage medium of the heat storage type air conditioner according to the first embodiment of the present invention and the opening / closing operation of the first opening / closing device. (B) is a diagram of an example showing how the heat radiation capacity changes by opening and closing the first switchgear of the heat storage type air conditioner according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the first embodiment of the present invention.

FIG. 4 (a) is an example showing a relationship between a condensing pressure detection value, a refrigerant discharge temperature, a room intake air temperature, and an opening / closing operation of a first opening / closing device of a heat storage type air conditioner according to a second embodiment of the present invention. FIG. (B) is a diagram of an example showing a relationship between a heat storage medium temperature, a heating supply capacity, and a refrigerant pressure of a heat storage type air conditioner according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the second embodiment of the present invention.

FIG. 6 is a refrigerant piping system diagram of a heat storage type air conditioner according to Embodiments 3 and 4 of the present invention.

FIG. 7A is a diagram showing an example of the relationship between the temperature of the heat storage medium of the heat storage type air conditioner according to the third embodiment of the present invention and the opening / closing operation of the second opening / closing device. (B) is a diagram showing an example of how the heat radiation capacity changes with changes in the heat storage medium temperature and the indoor intake air temperature of the heat storage type air conditioner according to the third embodiment of the present invention.

FIG. 8 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the third embodiment of the present invention.

FIG. 9 is a diagram showing an example of the relationship between the indoor intake air temperature and the heat storage medium temperature, the pressure detection value, and the heat radiation capacity of the heat storage type air conditioner according to the fourth embodiment of the present invention.

FIG. 10 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the fourth embodiment of the present invention.

FIG. 11 is a refrigerant piping system diagram of a heat storage type air conditioner according to Embodiments 5 and 6 of the present invention.

FIG. 12 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the fifth embodiment of the present invention.

FIG. 13 is a flowchart showing a control algorithm of the heat storage type air conditioner according to the sixth embodiment of the present invention.

FIG. 14 is a refrigerant piping system diagram of a conventional heat storage type air conditioner.

[Explanation of symbols]

 4 Utilization Side Heat Exchanger 4b Second Utilization Side Heat Exchanger 7 Heat Storage Medium 8 Heat Storage Tank 9 Cooling Heat Exchanger 11 Fourth Pressure Reduction Mechanism 13 Refrigerant Gas Pump 19 Second Four-way Switching Valve 20 Second Pressure Reduction Mechanism 21 Cooling / heating circuit using cold storage (cooling / radiating circuit) 21a Second liquid side piping 27 Control device 28 First bypass circuit 30 First switchgear device 32 Condensation pressure detection device 33 Second bypass circuit 34 Second Opening / closing device 35 Temperature detection device 36 Air temperature detection device 37 Discharge pressure detection device 38 Refrigerant state detection device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F25B 13/00 U 351 (72) Inventor Masami Imanishi 6-5-6 Tehira, Wakayama Mitsubishi Electric Incorporated company Wakayama Works

Claims (6)

[Claims] 1. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchange is performed by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage device, and a heat storage tank that incorporates a heat storage medium that performs heat storage / heat storage or heat release / heat radiation via the heat storage heat exchanger for heat storage, A first bypass circuit that is connected between the liquid side pipe of the cooling / radiating circuit and the suction pipe of the refrigerant pump and has a first opening / closing device; and the heat storage medium temperature that is provided in the heat storage tank and detects the heat storage medium temperature. Cool storage heat temperature detection device,
Based on the heat storage medium temperature detected by the cool heat storage temperature detecting device when performing cooling / radiating operation via the heat storage heat storage heat exchanger and the utilization side heat exchanger for the stored heat storage medium, A heat storage type air conditioner comprising: a first control device that controls opening and closing of the first opening and closing device. 2. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchange is performed by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage device, and a heat storage tank that incorporates a heat storage medium that performs heat storage / heat storage or heat release / heat radiation via the heat storage heat exchanger for heat storage, A first bypass circuit having a first opening / closing device connected between the liquid side pipe of the cooling / radiating circuit and the suction pipe of the refrigerant pump, and a load for detecting the operating load of the refrigerant pump. An amount detection device and a heat storage medium that has previously stored and stored heat are detected by the load amount detection device when performing cooling / radiating operation via the heat exchanger for cold storage and the heat exchanger on the use side. The first switching device based on the operating load of the refrigerant pump A heat storage type air conditioner comprising: a second control device for controlling opening and closing of the storage device. 3. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchange is performed by switching the refrigerant flow path of the four-way switching valve. Storage / heat radiation circuit for freely switching between cooling and heating via a heat storage device, and a heat storage tank containing a heat storage medium for storing / storing heat or discharging / dissipating heat via the heat storage heat storage heat exchanger, and the refrigerant A second bypass circuit connected between the discharge pipe and the suction pipe of the pump and having a second opening / closing device; a cold storage heat temperature detection device provided in the heat storage tank for detecting the temperature of the heat storage medium; Based on the heat storage medium temperature detected by the cool heat storage temperature detection device when performing cold discharge / heat radiation operation via the heat storage heat storage heat exchanger and the use side heat exchanger for the stored heat storage / heat storage medium To control the opening / closing of the second opening / closing device A heat storage type air conditioner comprising a third control device. 4. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchange is performed by switching the refrigerant flow path of the four-way switching valve. Storage / heat radiation circuit for freely switching between cooling and heating via a heat storage device, and a heat storage tank containing a heat storage medium for storing / storing heat or discharging / dissipating heat via the heat storage heat storage heat exchanger, and the refrigerant A second bypass circuit connected between the discharge pipe and the suction pipe of the pump and having a second opening / closing device, a load amount detecting device for detecting the operating load amount of the refrigerant pump, and cold storage / heat storage in advance. Based on the operation load amount of the refrigerant pump detected by the load amount detection device when performing cooling / radiating operation through the heat storage medium heat exchanger and the utilization side heat exchanger for the stored heat storage medium A fourth for controlling the opening / closing of the second opening / closing device And a control device for the heat storage type air conditioner. 5. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a pressure reducing mechanism, and a usage-side heat exchanger are sequentially connected, and the usage-side heat exchange is performed by switching the refrigerant flow path of the four-way switching valve. A heat release / heat radiation circuit that freely switches between cooling and heating via a heat storage device, and a heat storage tank that incorporates a heat storage medium that performs heat storage / heat storage or heat release / heat radiation via the heat storage heat exchanger for heat storage, A first bypass circuit having a first switchgear connected between the liquid side pipe of the cooling / radiating circuit and the suction pipe of the refrigerant pump; and the discharge pipe and suction pipe of the refrigerant pump. A second bypass circuit connected between and having a second opening / closing device, a cold storage heat temperature detecting device provided in the heat storage tank for detecting a heat storage medium temperature, and a refrigerant in the suction pipe of the refrigerant pump. Refrigerant state detection device that detects the degree of superheat Based on the heat storage medium temperature detected by the cool heat storage temperature detecting device when performing cooling / radiating operation via the heat storage heat storage heat exchanger and the utilization side heat exchanger for the stored heat storage medium, A fifth controller for controlling the opening and closing of the first opening and closing device and for opening and closing the second opening and closing device based on the degree of superheat detected by the refrigerant state detection device when the first opening and closing device is opened; A heat storage type air conditioner comprising: 6. A refrigerant pump, a four-way switching valve, a heat exchanger for cold storage heat, a decompression mechanism with a variable opening, and a heat exchanger on the use side are sequentially connected, and the four-way switching valve switches the refrigerant flow path to achieve the above. Cooling / radiating circuit that can freely switch between cooling and heating via the heat exchanger on the use side, and heat storage that has a built-in heat storage medium that stores cold / heat or cools / radiates heat via the heat exchanger for cold storage A tank, a first bypass circuit having a first opening / closing device connected between the liquid side pipe of the cooling / radiating circuit and the suction pipe of the refrigerant pump, and heat storage provided in the heat storage tank. A cold storage temperature detecting device for detecting the medium temperature,
A refrigerant state detection device that detects the degree of superheat of the refrigerant in the suction pipe of the refrigerant pump, and cools the heat storage medium that has previously stored and stored heat through the heat exchanger for cold storage and the heat exchanger on the use side. When performing the heat radiation operation, the opening / closing control of the first opening / closing device is performed based on the heat storage medium temperature detected by the cold storage heat temperature detecting device, and the refrigerant state detection device is used when the first opening / closing device is opened. A heat storage type air conditioner, comprising: a sixth control device that throttle-controls the pressure reducing mechanism based on the detected degree of superheat.