JPH11159906A - Absorption heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly hold distribution of a working medium at the internal part of a device and to reliably recover the working medium to a thick solution tank. SOLUTION: A refrigerant circuit provided with a refrigerant flow passage 7, a thin solution flow passage 9, and a thick solution flow passage 17 to store a working medium, a receiver 16, and a gas liquid separator 2. The thick solution tank 17 is portioned below the liquid receiver 16 and the gas liquid separator 2. The working medium is recovered in the thick solution tank 17 through the action of gravity and by blocking gathering of the working medium at an absorber 6 and a condenser 3, operation performance of a solution pump 10 is improved and a device is reliably started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump system used for an air conditioning refrigeration system, a hot water system, and the like.

[0002]

2. Description of the Related Art Conventionally, this type of absorption heat pump system is generally shown in FIG. 10, and will be described below with reference to FIG. 10 which shows a configuration diagram of the absorption heat pump system.

A gas-liquid separator 2 provided at an outlet 1a of a regenerator 1, a gas-side outlet 2a of the gas-liquid separator 2, a condenser 3,
Expansion valve 4, evaporator 5, and gas-side inlet 6a of absorber 6
, A liquid-side outlet 2 b of the gas-liquid separator 2, a pressure reducing valve 8, and a liquid-side inlet 6 of the absorber 6.
b, a dilute solution flow path 9, an outlet 6 c of the absorber 6, a solution pump 10, and an inlet 1 b of the regenerator 1.
The refrigerant circuit of the absorption type heat pump system is constituted by the concentrated solution flow path 11 which is sequentially connected to the working fluid, and a working medium such as an aqueous ammonia solution is sealed inside the refrigerant circuit.

[0004] The concentrated solution of the aqueous ammonia solution in the regenerator 1 is heated by the combustion heat of gas or kerosene or the like in the burner 1c, and separated in the gas-liquid separator 2 into the ammonia gas refrigerant and the dilute solution. The separated gas refrigerant flows into the refrigerant flow path 7, radiates heat in the condenser 3, is decompressed and expanded by the expansion valve 4, absorbs heat of evaporation in the evaporator 5, becomes gas refrigerant again, and flows into the absorber 6. Sent. On the other hand, the separated dilute solution flows through the dilute solution flow path 9 and flows into the absorber 6, where the dilute solution absorbs the gas refrigerant and becomes a concentrated solution. It is returned to the regenerator 1 again by the pump 10.

When such an absorption type heat pump system is used as a cooling machine, the condenser 3 has a cooling water inlet pipe 1.
2a and the cooling water outlet pipe 13a are connected and cooled with cooling water. The cooling water inlet pipe 12b and the cooling water outlet pipe 1
3b and cooled by cooling water, and further, the cold water inlet pipe 14 and the cold water outlet pipe 15 are connected to the evaporator 5 to take out cold water, and the cold water is sent indoors to perform cooling. . When such an absorption heat pump system is used as a heater, the evaporator 5 generates cold water lower than the outside air temperature, and performs a heat pump operation of absorbing heat from the outside air to generate heat in the condenser 3 and the absorber 6. Heat was released into the room to heat the room. Further, when such an absorption type heat pump system is used as a water heater, the heat pump operation is performed by absorbing heat from the outside air in the evaporator 5 and generated in the condenser 3 and the absorber 6 as in the case of using as a heater. Heat was used to heat the hot water.

[0006]

However, in the conventional absorption heat pump system, the gas refrigerant is supplied to the condenser 3.
And the dilute solution accumulates in the vapor-liquid separator 2,
The concentrated solution is configured to accumulate in the absorber 6 and the regenerator 1. Therefore, depending on the operation state, a large amount of gas refrigerant accumulates in the condenser 3, a large amount of dilute solution accumulates in the gas-liquid separator 2, or a large amount of concentrated solution accumulates in the absorber 6, and the working medium is stored inside the device. There is a problem in that an unstable distribution state occurs, and the absorption capacity and the condensation capacity are reduced, and the performance of the apparatus is reduced.

Further, there is another problem that the amount of the concentrated solution is not sufficiently ensured at the inlet of the solution pump 10, and the solution pump 10 cannot be operated.

[0008] Further, since the capacity of the refrigerant circuit is not sufficiently ensured, in order to maintain a constant performance, the amount of the working medium to be charged into the apparatus, that is, the allowable range of the charged amount is narrow, and the absorber 6 and the like are required. The component parts require a large volume, and have a problem that it is difficult to reduce the size of the device.

In addition, since the distribution of the working medium is not constant when the apparatus is started, it may take a long time to stabilize the operation, and it takes time to restart the operation after the operation is stopped. I was

Also, when the operation of the apparatus is stopped,
Since the gas refrigerant and the dilute solution are separated and retained, after the start of operation, the retained gas refrigerant and the dilute solution are mixed in the absorber 6 and are generated as heat of absorption.
Excessive heat dissipation is required, and there is a problem that the performance is reduced particularly during the on / off operation.

Further, depending on the conditions of the cooling water temperature and the cooling water temperature, the amount of the gas refrigerant, the amount of the dilute solution, and the amount of the concentrated solution existing inside the apparatus are different, so that the absorber 6 cannot be operated under a constant concentration condition. However, there is a problem that the operation becomes unstable.

Since the concentrated solution at the outlet 6c of the absorber 6 has a small degree of supercooling and is close to an equilibrium state, when the pressure decreases at the inlet of the solution pump 10, bubbles are generated and the solution pump 1
0 is a gas biting operation state, the flow rate of the concentrated solution fluctuates remarkably, and an unstable operation state is caused.
0 had the problem of being damaged.

If the degree of supercooling of the concentrated solution at the outlet 6c of the absorber 6 is too high, the amount of heating of the regenerator 1 must be increased, and the performance is reduced. If the degree of supercooling is too low, the operation tends to be a gas biting operation, and there is a problem that it is difficult to always maintain stable operation of the apparatus with an optimum degree of supercooling.

The pressure of the device is set by the flow rate and temperature of the cooling water in the condenser 3. In an air conditioner or the like, the condition of the cooling water temperature often changes depending on the outside air condition. Since the pressure difference between the high pressure side and the low pressure side also changed, and it was difficult to set the flow rate of the dilute solution to an optimal value,
There was a problem that it was difficult to maintain the performance under various environmental conditions.

Further, at the time of start-up, the pressure inside the device does not rise sufficiently, and the pressure difference between the high pressure side and the low pressure side is in a small state. It is difficult to return to the concentrated solution tank through
There has been a problem that the operation of the solution pump 10 cannot be performed, it takes a long time to reach a stable operation state, and the startup performance is deteriorated.

Further, when the working medium accumulates in the gas-liquid separator 2, the condenser 3 and the expansion valve 4 and the concentrated solution sent to the regenerator 1 disappears, and the pressure difference between the high pressure side and the low pressure side disappears. However, there is a problem that the restart cannot be performed.

[0017]

According to the present invention, in order to solve the above-mentioned problems, a gas-liquid separator for storing a dilute solution is provided in a dilute solution flow path, and a liquid receiver for storing a refrigerant is provided in a refrigerant flow path. The concentrated solution flow path is provided with a concentrated solution tank for storing the concentrated solution, and the concentrated solution tank is positioned below the gas-liquid separator and the liquid receiver.

According to the invention, the dilute solution is stored in the gas-liquid separator, the refrigerant is stored in the receiver, and the concentrated solution is stored in the concentrated solution tank. It is possible to obtain high performance without lowering or reducing the absorption performance by flowing into and accumulating in the absorber. In addition, even when the operation of the apparatus is stopped, a part of the refrigerant in the receiver and a part of the dilute solution in the gas-liquid separator can be recovered in the concentrated solution tank by the action of gravity. Since a concentrated solution can be secured, a stable operating state can be obtained.

Further, a gas-liquid separator for storing the dilute solution in the dilute solution flow path, a receiver for storing the refrigerant in the refrigerant flow path, and a concentrated solution tank for storing the concentrated solution in the concentrated solution flow path are provided. The solution tank is provided below the gas-liquid separator and the receiver, and the inner volume of the concentrated solution tank is larger than the sum of the inner volumes of the receiver and the gas-liquid separator. Is larger than the volume.

According to the above invention, even when all of the refrigerant in the receiver and the dilute solution in the gas-liquid separator flow into the concentrated solution tank, the concentrated solution tank becomes full and the concentrated solution is absorbed by the absorber. Since it does not flow into and accumulate in the inside, the absorption performance is not reduced or the performance is not significantly reduced. Further, the filling amount of the working medium can be arbitrarily set within the range of the volumes of the concentrated solution tank, the gas-liquid separator, and the liquid receiver, and the component parts can be downsized.

A gas-liquid separator for storing the dilute solution in the dilute solution flow path, a receiver for storing the refrigerant in the refrigerant flow path, and a concentrated solution tank for storing the concentrated solution in the concentrated solution flow path are provided. The position of the solution tank is below the gas-liquid separator and the receiver, and the concentrated solution tank and the receiver are connected by a refrigerant bypass having an open / close valve, and the concentrated solution tank and the gas-liquid are connected. It is to be connected to the separator by a dilute solution bypass having an on-off valve.

According to the invention, when the apparatus is started, the on-off valves are opened to collect the refrigerant of the receiver and the dilute solution of the gas-liquid separator into the concentrated solution tank and immediately start the solution pump. Can be operated, so that the operation start-up time of the device can be shortened.

Further, the gas-liquid separator is connected to a pressure reducing means, an absorber, and a concentrated solution tank located below, in that order, and the condenser is provided with a liquid receiver, an evaporator located below it. , And an absorber.

According to the above invention, when the apparatus is stopped, all the working medium is collected in the concentrated solution tank, so that the apparatus can always be started up in the same state. Since no significant heat generation occurs, stable and high-performance on-off operation can be realized.

The concentrated solution tank is provided at a position lower than the liquid receiver and the gas-liquid separator. Liquid level detecting means is provided for each of the concentrated solution tank, the liquid receiver and the gas-liquid separator. The opening of the expansion valve and the pressure reducing means is controlled by the control means in accordance with the signal of the liquid level detecting means.

According to the above invention, the amount of liquid in the receiver and the amount of liquid in the gas-liquid separator can be arbitrarily set by controlling the degree of opening of the expansion valve and the pressure reducing means. Therefore, the concentration conditions of the dilute solution and the concentrated solution can be set constant, and stable operation and high-performance operation can be realized. Further, even when the amount of liquid in the concentrated solution tank becomes empty, idle operation of the solution pump can be prevented by detecting with the liquid level detecting means.

A supercooling heat exchanger is located between the concentrated solution tank and the solution pump, and the cooling water outlet of the supercooling heat exchanger and the cooling water inlet of the absorber are connected by a cooling water connection pipe. I have to do that.

According to the above invention, the cooling water cools the concentrated solution by the supercooling heat exchanger, raises its own temperature, and then cools the absorber. The temperature of the concentrated solution at the inlet of the pump is lowered, so that a supercooled state of the concentrated solution can be reliably obtained, and the solution pump can be reliably prevented from being damaged by gas biting.

A supercooling heat exchanger is located between the concentrated solution tank and the solution pump, and the cooling water outlet of the supercooling heat exchanger and the cooling water inlet of the absorber are connected by a cooling water connection pipe. The downstream side of the check valve provided in the cooling water connection pipe and the three-way valve provided in the cooling water inlet pipe of the supercooling heat exchanger are connected by a branch pipe, and the three-way valve is connected to a solution pump. The switching is performed by the control device according to the signal of the supercooling detection means provided on the inlet side of the device.

According to the invention, the supercooling detecting means detects the supercooling state of the solution pump, and when the supercooling state is small, the cooling water flows from the supercooling heat exchanger to the absorber, and When the cooling state is large, the three-way valve is switched by the control device to flow directly to the absorber without passing through the supercooling heat exchanger, thereby maintaining high performance while preventing the gas pumping operation of the solution pump. Can be.

The low pressure circuit section is provided with a low pressure detecting means, and the high voltage circuit section is provided with a high pressure detecting means. Is to be controlled.

According to the present invention, the degree of pressure reduction can be set in accordance with the pressure difference between the high-pressure side and the low-pressure side, so that the flow rate of the dilute solution can be set optimally and can be adjusted to various environmental conditions. Accordingly, stable operation can be realized.

Further, the space between the inlet and the outlet of the solution pump is
It is connected by a bypass pipe provided with an on-off valve, and a regeneration temperature detecting means is provided at the outlet of the regenerator, and the control device opens and closes the on-off valve in response to a detection signal of the regeneration temperature detecting means.

According to the invention, the flow rate of the solution pump can be increased in a state where the regeneration temperature is sufficiently increased, the high pressure is secured, and the dilute solution can return.
A stable state of operation can be quickly reached, and a device having excellent startup characteristics can be realized.

Further, a heating means is provided in each of the gas-liquid separator and the liquid receiver, and the heating means is controlled by a control device in accordance with a detection signal of a liquid level detecting means provided in the concentrated solution tank.

According to the above invention, when the solution in the concentrated solution tank becomes low and the operation of the solution pump becomes difficult, this is detected by the liquid level detecting means, and the gas-liquid separator and the liquid receiver are connected. The heating means is heated by the control device to bring the gas-liquid separator and the liquid receiver into a high pressure state, and the liquid inside can be returned to the solution tank by the pressure difference, so that the apparatus is reliably started. be able to.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, A refrigerant flow path in which a gas-side inlet of an absorber and a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a pressure reducing means, and a liquid-side inlet of the absorber are sequentially connected; , A concentrated solution tank, a solution pump, and a concentrated solution flow path to which an inlet of a regenerator is sequentially connected. And a gas-liquid separator.

During operation of the apparatus, the dilute solution accumulates in the gas-liquid separator, the refrigerant accumulates in the receiver, and the concentrated solution accumulates in the concentrated solution tank. It is possible to obtain high performance without lowering or reducing the absorption performance by flowing into and accumulating in the absorber. After the operation of the apparatus is stopped, part of the refrigerant in the receiver and part of the dilute solution in the gas-liquid separator are collected in the concentrated solution tank by gravity. As a result, a stable operating state can be obtained.

A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a decompression means and a liquid-side inlet of the absorber are connected in order, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. In the refrigerant circuit of the absorption heat pump system provided, the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the internal volume of the concentrated solution tank is the internal volume of the liquid receiver. And the internal volume of the gas-liquid separator, and larger than the volume of the working medium filled in the apparatus.

Even when the refrigerant in the receiver and the dilute solution in the gas-liquid separator all flow into the concentrated solution tank during operation of the apparatus, the volume of the concentrated solution tank is sufficiently ensured. Therefore, the concentrated solution tank does not overflow due to being full, and the concentrated solution does not flow into and accumulate in the absorber, so that the absorption performance is not reduced or the performance is not significantly reduced. Further, the filling amount of the working medium can be arbitrarily set within the range of the volumes of the concentrated solution tank, the gas-liquid separator, and the liquid receiver, and the component parts can be downsized.

A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a pressure reducing valve and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of an absorption heat pump system, wherein the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the concentrated solution tank and the liquid receiver have a first open / close valve. The concentrated solution tank and the gas-liquid separator are connected by a refrigerant bypass, and are connected by a dilute solution bypass having a second on-off valve.

When the apparatus is started, the first on-off valve and the second on-off valve are opened to collect the refrigerant in the receiver and the dilute solution in the gas-liquid separator into the concentrated solution tank by the action of gravity. Therefore, liquid components can always be secured at the inlet of the solution pump, damage due to idle running of the solution pump can be prevented, and the apparatus can be started up quickly and reliably.

Also, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a liquid pressure inlet and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of an absorption heat pump system, wherein the gas-liquid separator is connected to the depressurizing means, the absorber, and the concentrated solution tank located below in this order, and the condenser is Is connected to the above-mentioned liquid receiver, expansion valve, evaporator, and absorber located in the lower part in this order.

Even after any operation, when the apparatus is stopped, all of the working medium is recovered in the concentrated solution tank by the action of gravity, so that the apparatus can always be started stably in the same state. Also, at the time of start-up, no extra heat is generated in the absorber, so that a high-performance operation can be started, and the performance does not deteriorate even during the on-off operation.

A regenerator, a gas-liquid separator communicating with the outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a liquid pressure inlet and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of the absorption heat pump system, wherein the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the concentrated solution tank, the liquid receiver, and the gas-liquid separator are provided. Are provided with liquid level detecting means, respectively, and the degree of opening of the expansion valve and the pressure reducing means is controlled by a control device in accordance with a signal from the liquid level detecting means.

The liquid level in the liquid receiver is detected by detecting the liquid level of the liquid receiver and the gas-liquid separator by the liquid level detecting means, and controlling the opening of the expansion valve and the pressure reducing means by the control device. And the amount of liquid in the gas-liquid separator can be arbitrarily set to set the concentration conditions of the dilute solution and the concentrated solution to be constant, and a stable absorption cycle operation can be realized. When the liquid amount in the concentrated solution tank becomes empty, the liquid level in the liquid receiver and the gas-liquid separator in the gas-liquid separator is detected by detecting the liquid level and opening the decompression means and the expansion valve by the control device. Can be collected in the concentrated solution tank, and idle running of the solution pump can be prevented.

Also, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a liquid pressure inlet and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of the absorption heat pump system, wherein a supercooling heat exchanger is provided between the concentrated solution tank and the solution pump, and a cooling water outlet of the supercooling heat exchanger has a cooling water outlet of the absorber. It is connected to the inlet by a cooling water connection pipe.

The cooling water cools the concentrated solution by a supercooling heat exchanger to raise its temperature, and then cools the absorber, so that the temperature of the concentrated solution is higher than that of the outlet of the absorber. The inlet of the pump is lower, so that supercooling can be reliably obtained. Therefore, since the gas does not bite into the solution pump, the flow rate of the concentrated solution is stabilized, the operation of the apparatus can be kept stable, and the solution pump can be prevented from being damaged due to gas biting.

Also, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a liquid pressure inlet and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of an absorption heat pump system, wherein a supercooling heat exchanger is provided between the concentrated solution tank and the solution pump, and a cooling water outlet of the supercooling heat exchanger is connected to a cooling water inlet of the absorber. Connected by cooling water connection pipe,
The cooling water connection pipe is provided with a check valve, the cooling water inlet pipe of the supercooling heat exchanger is provided with a three-way valve, and the three-way valve is connected to the downstream side of the check valve by a branch pipe. The three-way valve is switched by a control device in accordance with a signal from the supercooling detection means.

Then, the supercooling state of the solution pump is detected by the supercooling detecting means, and when the supercooling state is small, the cooling water flows from the supercooling heat exchanger to the absorber, and when the supercooling state is large, By switching the three-way valve by the control device and flowing directly to the absorber without passing through the supercooling heat exchanger, the supercooled state of the concentrated solution at the inlet of the solution pump can always be maintained in an optimum state. In addition, the high performance can be maintained while preventing the gas pumping operation of the solution pump.

Also, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are sequentially connected; a liquid-side outlet of the gas-liquid separator;
A dilute solution flow path in which an opening degree can be varied and a liquid side inlet of an absorber are connected in order, and a concentrated solution in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of an absorption heat pump system having at least a flow path, wherein the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the expansion valve, the pressure reducing means, and the solution pump are provided. The low-pressure circuit section separated by the inlet of the low-pressure circuit section is provided with low-pressure detection means, and the high-pressure circuit section comprising the refrigerant circuit other than the low-pressure circuit section is provided with high-pressure detection means. The opening degree of the pressure reducing means is controlled by the control means.

The optimal dilute solution flow rate is set by setting the opening degree of the pressure reducing means by the control device according to the pressure difference between the low pressure side and the high pressure side detected by the low pressure detecting means and the high pressure detecting means. can do. Therefore, stable operation can be realized according to various environmental conditions, and the capacity control can be reliably performed.

Also, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser,
A refrigerant flow path in which a liquid receiver, an expansion valve, an evaporator, and a gas-side inlet of an absorber are connected in order; a liquid-side outlet of the gas-liquid separator;
At least a dilute solution flow path in which a liquid pressure inlet and a liquid-side inlet of an absorber are sequentially connected, and a concentrated solution flow path in which an outlet of the absorber, a concentrated solution tank, a solution pump, and an inlet of a regenerator are sequentially connected. A refrigerant circuit of an absorption heat pump system, wherein the inlet and the outlet of the solution pump are connected by a bypass pipe provided with an on-off valve, and the outlet of the regenerator is
A regeneration temperature detecting means is provided, and the on-off valve is opened and closed by a control device in accordance with a signal from the regeneration temperature detecting means.

The regeneration temperature is detected by the regeneration temperature detecting means. If the regeneration temperature is low, the control device opens the on-off valve provided in the bypass pipe to reduce the flow rate of the concentrated solution flowing into the regenerator. It is possible to speed up the regeneration temperature. When the regeneration temperature is high, the control device closes the on-off valve provided in the bypass pipe, so that the flow rate of the concentrated solution flowing into the regenerator can be increased to increase the capacity. Therefore, the regeneration temperature can be sufficiently increased, the flow rate of the solution pump can be increased in a state where the high pressure is secured and the dilute solution can return, so that a stable state of operation can be quickly reached, and the operation startup characteristics The device excellent in the above can be realized.

Further, a regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of an absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank; A refrigerant circuit of an absorption heat pump system comprising at least a solution pump, and a concentrated solution flow path in which inlets of a regenerator are sequentially connected, wherein a heating means is provided in each of the gas-liquid separator and the liquid receiver, The heating means is controlled by the control means in accordance with the detection signal of the liquid level detection means provided in the solution tank.

Even when the solution pump is difficult to operate due to a low amount of liquid in the concentrated solution tank, this is detected by the liquid level detecting means and the heating means for the gas-liquid separator and the liquid receiver is controlled. Since the internal pressure of the gas-liquid separator and the receiver can be increased by heating the device, the liquid inside the gas-liquid separator and the receiver can be returned to the solution tank by the pressure difference. In any state, the apparatus can be reliably started.

[0057]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Note that the same reference numerals are given to the same components as those described in FIG. 10 as a conventional example, and detailed description will be omitted.

Embodiment 1 FIG. 1 is a configuration diagram of an absorption heat pump system according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 7 denotes a refrigerant flow path,
Gas-liquid separator 2 provided at the outlet 1a of the
, The condenser 3, the liquid receiver 16, the expansion valve 4, the evaporator 5, and the gas-side inlet 6 a of the absorber 6 are sequentially connected and formed. Reference numeral 9 denotes a dilute solution flow path, and a liquid-side outlet 2b of the gas-liquid separator 2 and a pressure reducing valve 8 as a pressure reducing means.
And the liquid-side inlet 6b of the absorber 6 are sequentially connected and formed. Reference numeral 11 denotes a concentrated solution flow path, which is formed by sequentially connecting the outlet 6c of the absorber 6, the concentrated solution tank 17, the solution pump 10, and the inlet 1b of the regenerator 1. The refrigerant flow path 7, the dilute solution flow path 9 and the concentrated solution flow path 11 constitute a refrigerant circuit of an absorption heat pump system.
Is installed below the installation position of the gas-liquid separator 2 and the liquid receiver 16, and a working medium composed of an aqueous ammonia solution which is a mixture of a refrigerant such as ammonia and an absorbent such as water is sealed therein. . The condenser 3 and the absorber 6 are connected to cooling water inlet pipes 12a and 12b and cooling water outlet pipes 13a and 13b, respectively, which are inlets and outlets of cooling water for cooling them. Is connected to a cold water inlet pipe 14 and a cold water outlet pipe 15 for obtaining cold water.

Next, the operation and operation of the absorption heat pump system according to the first embodiment will be described.

The concentrated solution of the aqueous ammonia solution in the regenerator 1 is heated by the combustion heat of gas or kerosene or the like in the burner 1c, and separated in the gas-liquid separator 2 into the ammonia gas refrigerant and the dilute solution. The separated gas refrigerant flows into the refrigerant flow path 7, enters the cooling water inlet pipe 12 a in the condenser 3, radiates heat to the cooling water flowing out of the cooling water outlet pipe 13 a, is liquefied, and accumulates in the liquid receiver 16. The ammonia refrigerant discharged from the receiver 16 is decompressed and expanded by the expansion valve 4, and in the evaporator 5, the heat of vaporization of the cold water that enters through the cold water inlet pipe 14 and exits through the cold water outlet pipe 15 is absorbed and gasified. It becomes gas refrigerant again and is sent to the gas side inlet 6a of the absorber 6.

In the absorber 6, the gas refrigerant flows through the dilute solution flow path 9 and is absorbed by the dilute solution flowing from the liquid side inlet 6b of the absorber 6 to become a concentrated solution of the ammonia aqueous solution. It exits from the outlet 6c and accumulates in the concentrated solution tank 17.
Then, the concentrated solution that has left the concentrated solution tank 17 is returned to the regenerator 1 by the solution pump 10 again.

When such an absorption heat pump system is used as a cooling machine, the condenser 3 has a cooling water inlet pipe 1.
2a and the cooling water outlet pipe 13a are connected to cool the condenser 3 with the cooling water.
By connecting the cooling water outlet pipe 13b to the cooling water outlet pipe 13b and cooling the absorber 6 with the cooling water, the gas refrigerant passing therethrough is cooled. Since the cold water inlet pipe 14 and the cold water outlet pipe 15 are connected to the evaporator 5, the evaporator 5 can take out cold water cooled by the gas refrigerant. Cooling can be performed by sending this cold water into a room and flowing it to a fan coil unit or the like which is an indoor terminal.

During operation of the apparatus, the excess working medium is such that ammonia refrigerant accumulates in the receiver 16, dilute solution accumulates in the gas-liquid separator 2, concentrated solution accumulates in the concentrated solution tank 17, Since it does not accumulate in the absorber 6 and the condensation performance and the absorption performance, the performance of the apparatus is not reduced, and the high-performance operation can always be stably realized. Further, since the concentrated solution tank 17 is located below the gas-liquid separator 2 and the liquid receiver 16, when the operation of the apparatus is stopped, the diluted solution in the gas-liquid separator 2 and the liquid A part of the ammonia refrigerant in the vessel 16 is caused by the action of gravity.
Since the liquid is returned to the concentrated solution tank 17, the liquid component is always kept at the inlet of the solution pump 10, and idle operation can be prevented.

The capacity of the concentrated solution tank 17 is larger than the sum of the capacity of the gas-liquid separator 2 and the capacity of the receiver 16.
In addition, it is configured to be larger than the volume of the working medium filled inside the device.

For example, when the temperature of the cooling water is low,
That is, in the cooling operation or the like when the outside air temperature is low,
Because the pressure on the high pressure side is low, the working medium inside the device is
A large amount of water is accumulated on the high-pressure circuit side of the gas-liquid separator 2 and the liquid receiver 16, and the amount of accumulated in the concentrated solution tank 17 on the low-pressure circuit side is reduced. However, the volume of the concentrated solution tank 17 is
Is larger than the sum of the volume of the liquid receiver and the volume of the liquid receiver 16, all the working medium accumulated in the gas-liquid separator 2 and the liquid receiver 16 flows into the concentrated solution tank 17 and accumulates. Even if it does, it does not overflow from the concentrated solution tank 17 and accumulates in the absorber 6 to reduce its absorption performance, thereby lowering the performance of the apparatus, and it is possible to secure stable performance.

Further, the amount of the working medium to be filled can be set arbitrarily within the range of the volume of the concentrated solution tank 17, and the volume of the gas-liquid separator 2 and the volume of the liquid receiver 16 can be selected. By doing so, it is possible to set the condition of filling the working medium arbitrarily, such as setting the concentration of ammonia.

(Embodiment 2) FIG. 2 is a configuration diagram of an absorption heat pump system in Embodiment 2 of the present invention.

The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 2, reference numeral 18a denotes a first on-off valve,
It is provided in a refrigerant bypass 19 that connects the liquid receiver 16 and a concentrated solution tank 17 located below the liquid receiver 16. A second opening / closing valve 18b is provided in the dilute solution bypass 20 that connects the gas-liquid separator 2 and the concentrated solution tank 17 located below the gas-liquid separator 2.

Next, the operation and operation of the absorption heat pump system according to the second embodiment will be described.

During operation of the apparatus, the gas-liquid separator 2 and the receiver 16
When the operation is stopped or the apparatus is started, the working medium accumulated in the first opening / closing valve 18a and the second opening / closing valve 18
By opening b, the ammonia refrigerant accumulated in the receiver 16 and the dilute solution accumulated in the gas-liquid separator 2 can be directly collected in the concentrated solution tank 17. Thus, the liquid component can be secured at any time, and the time to start the operation is short, and the operation can be started up reliably.

(Embodiment 3) FIG. 3 is a configuration diagram of an absorption heat pump system in Embodiment 3 of the present invention.

The same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 3, the gas-liquid separator 2, the pressure reducing valve 8, the absorber 6, and the concentrated solution tank 17 are sequentially located downward from above, and these are connected in order. The condenser 3, the liquid receiver 16, the expansion valve 4, the evaporator 5, and the absorber 6 are sequentially located downward from above, and are connected in order.

Next, the operation and operation of the absorption heat pump system according to the third embodiment will be described.

After operating the apparatus under any conditions, by opening the pressure reducing valve 8 and the expansion valve 4, the working medium such as the ammonia refrigerant and the dilute solution flows through the refrigerant flow path 7, the dilute solution flow The concentrated solution is collected in the concentrated solution tank 17 by its gravitational action without accumulating in a pipe such as the path 9. Therefore, the apparatus can be stably started in the same state at all times, and high-performance operation start-up can be performed without generating extra heat in the absorber 6 at the start-up, and excellent on-off operation characteristics can be obtained. Device can be realized.

(Embodiment 4) FIG. 4 is a configuration diagram of an absorption heat pump system in Embodiment 4 of the present invention.

The same components as those in the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 4, reference numeral 21a denotes the concentrated solution tank 17;
A concentrated solution level sensor provided in the inside and functioning as a liquid level detection means, a refrigerant level sensor 21b provided in the receiver 16 and functioning as a liquid level detection means, and 21c provided in the gas-liquid separator 2 This is a dilute solution liquid level sensor that functions as liquid level detecting means. Reference numeral 22 denotes a control device that controls the degree of opening of the expansion valve 4 and the pressure reducing valve 8 according to detection signals from the concentrated solution level sensor 21a, the refrigerant level sensor 21b, and the dilute solution level sensor 21c.

Next, the operation and operation of the absorption heat pump system according to the fourth embodiment will be described.

Since the liquid level in the liquid receiver 16 can be detected as a liquid level by the refrigerant liquid level sensor 21b, the control device is controlled according to the flow rate of the solution pump 10 and the pressure difference between the high pressure side and the low pressure side. By adjusting the opening degree of the expansion valve 4 by means of 22, the liquid level, that is, the liquid amount can be kept constant. Further, since the liquid amount in the gas-liquid separator 2 can be detected as the liquid level by the dilute solution liquid level sensor 21c, the flow rate of the solution pump 10 and the high-pressure side and the low-pressure side Depending on the pressure difference between
By adjusting the opening of the pressure reducing valve 8 by the control device 22, the liquid level, that is, the liquid amount can be kept constant. Therefore, the liquid amount in the liquid receiver 16 and the liquid amount in the gas-liquid separator 2 can be easily maintained at arbitrary values, so that the capacity can be easily set by setting the flow rate of the solution pump 10. And stable operation can be realized.

When it is detected by the concentrated solution level sensor 21a that the amount of the solution in the concentrated solution tank 17 is insufficient, the amount of the solution in the receiver 16 and the gas-liquid separator 2 is determined. By controlling the opening degree of the expansion valve 4 or the pressure reducing valve 8 by the control device 22, the liquid amount in the concentrated solution tank 17 can be kept constant, so that the idle operation of the solution pump 10 is reliably prevented. can do.

(Embodiment 5) FIG. 5 is a configuration diagram of an absorption heat pump system in Embodiment 5 of the present invention.

The same components as those in the first to fourth embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 5, reference numeral 23 denotes a supercooling heat exchanger provided between the concentrated solution tank 17 and the solution pump 10, and a cooling water inlet pipe 12c is connected to an inlet of the supercooling heat exchanger 23. The cooling water connection pipe 24 is connected to the outlet.
The cooling water connection pipe 24 is connected to the cooling water inlet pipe 12b at the inlet of the absorber 6.

Next, the operation and operation of the absorption heat pump system according to Embodiment 5 will be described.

The cooling water flows into the absorber 6 to cool the concentrated solution in a state where the temperature of the concentrated solution is increased by cooling the concentrated solution in the supercooling heat exchanger 23. The outlet of the supercooling heat exchanger 23, that is, the inlet of the solution pump 10 is lower than the outlet, so that a supercooled state can be reliably obtained. As a result, gas does not bite into the solution pump 10, stable flow conditions with small fluctuations in the flow rate of the concentrated solution can be obtained, and the operation of the apparatus can be stably maintained. Furthermore, the solution pump 10 can be prevented from being damaged by the gas biting operation.

(Embodiment 6) FIG. 6 is a configuration diagram of an absorption heat pump system in Embodiment 6 of the present invention.

The same components as those in the first to fifth embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 6, reference numeral 25 denotes a check valve provided in the cooling water connection pipe 24, and reference numeral 26 denotes a check valve provided in the cooling water inlet pipe 12c.
One of the three-way valves 26 has a cooling water inlet pipe 12b.
Is connected to the branch pipe 27.
Is connected to a cooling water connection pipe 24 downstream of the check valve 25. Further, on the inlet side of the solution pump 10, there is provided a subcooling sensor 28 which detects temperature and pressure as subcooling detection means and detects subcooling. Control is performed according to a detection signal of the subcooling sensor 28. The circuit of the three-way valve 26 is switched by the device 22.

Next, the operation and operation of the absorption heat pump system according to Embodiment 6 will be described.

A supercooling sensor 28 functioning as a subcooling detecting means detects a supercooled state of the concentrated solution entering the solution pump 10, and when the supercooled state is small, the cooling water is absorbed from the supercooled heat exchanger 23. The circuit of the three-way valve 26 is set by the control device 22 so as to flow to the vessel 6. Further, when the supercooling state becomes large, the control device 22 is controlled so that the cooling water flows directly from the three-way valve 26 through the branch pipe 27 to the absorber 6 without passing through the supercooling heat exchanger 23. The flow path of the three-way valve 26 is switched. Therefore, the concentrated solution at the inlet of the solution pump 10 is always kept in an optimal supercooled state without generating gas and without excessive heat radiation. Can be maintained.

(Embodiment 7) FIG. 7 is a configuration diagram of an absorption heat pump system according to Embodiment 7.

The same components as those in the first to sixth embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 7, reference numeral 29 denotes a low-pressure pressure sensor which is provided in a concentrated solution tank 17 located in a low-pressure circuit section partitioned by an expansion valve 4, a pressure reducing valve 8, and an inlet of a solution pump 10 and functions as a low pressure detecting means. Reference numeral 30 denotes a high-pressure sensor that is provided in the liquid receiver 16 located in the high-pressure circuit, which is a refrigerant circuit other than the low-pressure circuit, and functions as high-pressure detecting means. The controller 22 controls the opening of the pressure reducing valve 8 and the expansion valve 4 in accordance with the signals from the low pressure sensor 29 and the high pressure sensor 30.

Next, the operation and operation of the absorption heat pump system according to Embodiment 7 will be described.

When the apparatus is started, the pressure difference between the high pressure side and the low pressure side is small, and the working medium sent by the solution pump 10 cannot return from the high pressure circuit to the low pressure circuit due to the pressure difference. Accordingly, when the pressure difference detected by the low pressure sensor 29 and the high pressure sensor 30 is small, the flow rate of the solution pump 10 is reduced by the control device 22 and the opening degree of the expansion valve 4 and the pressure reducing valve 8 is increased. To control.

When the operation has been continued for a certain period of time and the pressure difference has become sufficiently large, the opening of the expansion valve 4 and the pressure reducing valve 8 is reduced by the control device 22 in accordance with the flow rate of the solution pump 10. A low temperature can be obtained by lowering the evaporation temperature, and any capacity can be obtained. Further, since the opening of the pressure reducing means can be set according to the pressure difference between the high pressure side and the low pressure side, the flow rate of the dilute solution can be set optimally. Therefore, stable operation is realized according to various environmental conditions,
Capability control can also be performed reliably.

(Embodiment 8) FIG. 8 is a configuration diagram of an absorption heat pump system according to Embodiment 8.

The same components as those in the first to seventh embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 8, reference numeral 31 denotes a bypass pipe connecting the solution tank 17 provided at the inlet of the solution pump 10 and the outlet of the solution pump 10. The bypass pipe 31 is provided with an on-off valve 32. Reference numeral 33 denotes a temperature sensor which is provided between the outlet 1a of the regenerator 1 and the gas-liquid separator 2 and functions as a regenerating temperature detecting means. The controller 32 controls the opening of the opening 32.

Next, the operation and operation of the absorption heat pump system according to Embodiment 8 will be described.

When starting the apparatus, the solution pump 10
Is operated, the concentrated solution in the concentrated solution tank 17 is sent to the regenerator 1 where it is heated and turned into a gas-liquid two-phase flow, flows into the gas-liquid separator 2, and the ammonia gas is removed from the gas side outlet 2a.
The dilute solution having a low ammonia concentration flowing out of the outlet is pushed out to the absorber 6 from the liquid side outlet 2b by a pressure difference.

When the solution pump 10 sends out a large amount of the concentrated solution to the regenerator 1 when the pressure difference is not sufficiently large, the diluted solution is accumulated in the gas-liquid separator 2 and the concentrated solution in the concentrated solution tank 17 runs short. The operation of the solution pump 10 becomes impossible. Therefore, when the temperature detected by the temperature sensor 33 is low, that is, when the pressure on the high pressure side is low, the flow rate to the solution pump 10 is reduced by opening the on-off valve 32 by the control device 22 to reduce the flow rate to the regenerator. It is possible to prevent the concentrated solution from being sent too much to 1.

When the temperature detected by the temperature sensor 33 rises after the operation is continued for a certain period of time, that is, when the pressure on the high pressure side rises, the opening degree of the on-off valve 32 is reduced by the control device 22 to the solution pump 10. The concentrated solution at an appropriate flow rate can be sent to the regenerator 1 by increasing the flow rate. Therefore, in a state where the regeneration temperature is sufficiently increased, the pressure on the high pressure side is secured, and the dilute solution can return,
Since the flow rate to the solution pump 11 can be increased, a stable state of operation can be quickly reached, and a device with excellent startup characteristics can be realized.

(Embodiment 9) FIG. 9 is a configuration diagram of an absorption heat pump system according to Embodiment 9 of the present invention.

The same components as those in the first to eighth embodiments are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 9, reference numeral 34a denotes a dilute solution heater which is provided in the gas-liquid separator 2 and functions as a dilute solution heating means.
Reference numeral 4b denotes a refrigerant heater provided in the liquid receiver 16 and functioning as a heating means for the ammonia refrigerant. In response to a detection signal of a concentrated solution level sensor 21a provided in the concentrated solution tank 17 and functioning as a concentrated solution level detecting means, the control device 22 causes the expansion valve 4, the pressure reducing valve 8, the diluted solution heater 34a, and the refrigerant heater 34b.

Next, the operation and operation of the absorption heat pump system according to Embodiment 9 will be described.

When the operation of the apparatus is stopped or at the start of the operation, when the working medium is accumulated in the gas-liquid separator 2 and the receiver 16 and the concentrated solution tank 17 becomes empty, The concentrated solution level sensor 21a detects the control device 22
, The expansion valve 4 and the pressure reducing valve 8 are opened, and the diluted solution heater 34a and the refrigerant heater 34b are energized to heat the diluted solution and the ammonia refrigerant. Since the temperature of the heated ammonia refrigerant and the dilute solution increases and the pressure increases, the working medium collected in the gas-liquid separator 2 and the liquid receiver 16 is collected in the concentrated solution tank 17 by the pressure difference. be able to. Therefore, the pressure difference between the high pressure side and the low pressure side is small,
Even when the distribution of the working medium inside the device is uneven,
Since the working medium can be collected in the concentrated solution tank 17, the device can be reliably started at any time.

[0113]

The present invention is embodied in the form described in each of the claims described above, and has the following effects.

According to the first aspect of the present invention, a refrigerant circuit having at least a refrigerant channel, a dilute solution channel, and a concentrated solution channel has a concentrated solution tank, a liquid receiver, and a gas-liquid separator. Since the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, during operation of the apparatus, excess refrigerant and dilute solution accumulate in the liquid receiver and the gas-liquid separator, respectively. Since the other excess working medium can be stored as a concentrated solution in the concentrated solution tank, the apparatus can be operated with an appropriate refrigerant distribution, and high performance can be maintained. Further, when the operation is stopped, the refrigerant and the dilute solution stored in the receiver and the gas-liquid separator, respectively, can be collected in the concentrated solution tank, so that the solution pump can be reliably operated to start the apparatus. it can.

According to the second aspect of the present invention,
The concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the inner volume of the concentrated solution tank is larger than the sum of the inner volume of the liquid receiver and the inner volume of the gas-liquid separator. In addition, since the volume of the working medium to be filled in the device is larger than that of the working medium, the refrigerant in the receiver and the dilute solution in the gas-liquid separator all flow into the concentrated solution tank during the operation of the device. However, since the volume of the concentrated solution tank is sufficiently ensured, the concentrated solution tank becomes full and overflows, and the concentrated solution does not accumulate in the absorber. Or cause it to occur. Furthermore, since the amount and concentration of the working medium to be filled in the apparatus can be set according to the volumes of the concentrated solution tank, the liquid receiver and the gas-liquid separator, the filling conditions are wide, and the degree of freedom in design is wide. , And a small device can be realized.

According to the third aspect of the present invention,
A concentrated solution tank is provided below the receiver and the gas-liquid separator, and the concentrated solution tank and the receiver are connected by a refrigerant bypass having a first on-off valve, and the concentrated solution tank and the gas-liquid separator Since the apparatus is connected to the dilute solution bypass having the second on-off valve, when the apparatus is started, by opening the first on-off valve and the second on-off valve, the refrigerant in the liquid receiver and The dilute solution in the gas-liquid separator can be collected in the concentrated solution tank. As a result, the liquid component can always be ensured at the inlet of the solution pump, so that damage due to idle operation of the solution pump can be prevented, and the operation of the apparatus can be started up quickly and reliably.

According to the fourth aspect of the present invention,
A gas-liquid separator, a pressure reducing means, an absorber, and a concentrated solution tank located below the gas-liquid separator are connected in sequence, and a condenser, a liquid receiver, an expansion valve, an evaporator, and an absorption located below the condenser. Because the devices are connected in order, no matter how the device is operated, when the operation of the device is stopped, the working medium accumulated in any place can be collected in the concentrated solution tank by the action of gravity. . As a result, the apparatus can be started stably in the same state at all times, and since there is no medium flowing into the absorber at the time of start of operation, no extra heat is generated and high-performance start-up is performed. It is possible to realize a device excellent in on-off operation.

According to the fifth aspect of the present invention,
The concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the concentrated solution tank, the liquid receiver, and the gas-liquid separator are provided with liquid level detecting means, respectively. The control device controls the degree of opening of the expansion valve and the pressure reducing means in accordance with the signal of, so that the amount of liquid in the receiver and the amount of liquid in the gas-liquid separator are It can be set arbitrarily by controlling the opening degree. Further, since the concentration conditions of the dilute solution and the concentrated solution can be set to be constant, stable operation of the apparatus can be realized. Further, when the liquid amount in the concentrated solution tank becomes empty, by detecting the liquid level with the liquid level detecting means, the pressure reducing means and the expansion valve can be opened by the control device. The concentrated solution tank can collect the refrigerant and the dilute solution stored in the tank, and the idle operation of the solution pump can be prevented.

Further, according to the invention described in claim 6,
A supercooling heat exchanger is provided between the concentrated solution tank and the solution pump, and the cooling water outlet of the supercooling heat exchanger and the cooling water inlet of the absorber are connected by a cooling water connection pipe. In the heat exchanger, the concentrated solution is cooled, and the absorber is cooled by cooling water whose temperature has risen. The temperature of the concentrated solution is lower at the inlet of the solution pump than at the outlet of the absorber. Then, the supercooled state of the concentrated solution can be reliably obtained, and a stable flow rate condition in which the gas does not bite in the solution pump and the flow rate of the concentrated solution is small can be obtained.
Further, the operation of the apparatus can be stably maintained, and the damage caused by the gas biting operation of the solution pump can be prevented.

According to the invention described in claim 7,
A supercooling heat exchanger is provided between the concentrated solution tank and the solution pump, and the cooling water outlet of the supercooling heat exchanger and the cooling water inlet of the absorber are connected by a cooling water connection pipe having a check valve. ,
The three-way valve provided on the cooling water inlet pipe of the supercooling heat exchanger and the downstream side of the check valve provided on the cooling water connection pipe are connected by a branch pipe, and the supercooling detection provided on the inlet side of the solution pump. The three-way valve can be switched by the control device in response to the signal of the means. Then, by detecting the supercooling state of the solution pump by the supercooling detection means and switching the three-way valve by the control device, when the supercooling state is small, the cooling water flows from the supercooling heat exchanger to the absorber, When the supercooling state is large, it can flow directly to the absorber without passing through the supercooling heat exchanger. As a result, always keep the concentrated solution in the optimal supercooled state,
The gas pumping operation of the solution pump can be prevented and the high performance operation can be maintained.

Further, according to the invention described in claim 8,
A concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and a low pressure circuit section partitioned by the expansion valve, the pressure reducing means, and the inlet of the solution pump is provided with low pressure detecting means. The high-pressure circuit section formed by the refrigerant circuit is provided with high-pressure detecting means, and the control device controls the degree of opening of the depressurizing means according to signals from these low-pressure detecting means and high-pressure detecting means. The degree of opening of the decompression means can be set according to the pressure difference between the two, and the optimal dilute solution flow rate can be set. In addition, stable operation can be realized according to various environmental conditions, and capacity control can be reliably performed.

According to the ninth aspect of the present invention,
Since the inlet and the outlet of the solution pump are connected by a bypass pipe provided with an on-off valve, and the control device opens and closes the on-off valve according to the detection signal of the regeneration temperature detecting means provided at the outlet of the regenerator, The regeneration temperature can be raised quickly, the flow rate of the solution pump can be increased in a state where the high pressure is secured and the dilute solution can return, and a device with excellent startup characteristics that quickly reaches a stable operation state is realized. can do.

Further, according to the tenth aspect of the present invention, the gas-liquid separator and the liquid receiver are provided with heating means, respectively.
The control device controls these heating means in accordance with the detection signal of the liquid level detection means provided in the concentrated solution tank. Since the gas-liquid separator and the liquid receiver can be heated by the heating means controlled by the control device, the pressure inside the gas-liquid separator and the liquid receiver can be increased by detecting by the surface detecting means. In any case, the working medium can be returned to the solution tank by the pressure difference, so that the apparatus can be reliably started in any case.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an absorption heat pump system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an absorption heat pump system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of an absorption heat pump system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an absorption heat pump system according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of an absorption heat pump system according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of an absorption heat pump system according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of an absorption heat pump system according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of an absorption heat pump system according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of an absorption heat pump system according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram of a conventional absorption heat pump system.

[Explanation of symbols]

 Reference Signs List 1 regenerator 1a outlet 1b inlet 2 gas-liquid separator 2a gas side outlet 2b liquid side outlet 3 condenser 4 expansion valve 5 evaporator 6 absorber 6a gas side inlet 6b liquid side inlet 6c outlet 7 refrigerant flow path 8 pressure reducing valve ( 9 Decompression means 9 Dilute solution flow path 10 Solution pump 11 Concentrated solution flow path 12b, 12c Cooling water inlet pipe 16 Receptor 17 Concentrated solution tank 18a, 18b Open / close valve 19 Refrigerant bypass 20 Dilute solution bypass 21a Concentrated solution level sensor ( Liquid level detecting means) 21b Refrigerant liquid level sensor (liquid level detecting means) 21c Dilute solution liquid level sensor (liquid level detecting means) 22 Controller 23 Supercooling heat exchanger 24 Cooling water connection pipe 25 Check valve 26 Three-way valve 27 branch pipe 28 supercooling sensor (supercooling detecting means) 29 low pressure sensor (low pressure detecting means) 30 high pressure sensor (high pressure detecting means) 31 viper Pipe 32 open / close valve 33 temperature sensor (regeneration temperature detecting means) 34a dilute solution heater (heating means) 34b refrigerant heater (heating means)

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Satoshi Matsumoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Koichi Takemura 1006 Kazuma Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co.

Claims (10)

[Claims] 1. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which an inlet of the regenerator is sequentially connected, wherein the concentrated solution tank is located below the liquid receiver and the gas-liquid separator. 2. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas-side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which an inlet of the regenerator is sequentially connected. The concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the internal volume thereof is An absorption heat pump system in which the internal volume of the liquid container and the internal volume of the gas-liquid separator are larger than the sum of the working medium to be filled. 3. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path that sequentially connects the inlets of the regenerator. The concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and is provided with a refrigerant bypass having an on-off valve. An absorption heat pump system connected to the liquid receiver and connected to the gas-liquid separator by a dilute solution bypass having an on-off valve. 4. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which the inlet of the regenerator is sequentially connected, wherein the gas-liquid separator is located below the pressure reducing means, the absorber, and the concentrated solution tank in this order. An absorption heat pump system, wherein the condenser is connected to the receiver, the expansion valve, the evaporator, and the absorber located below the condenser in this order. 5. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which an inlet of the regenerator is sequentially connected, wherein the concentrated solution tank is provided below the liquid receiver and the gas-liquid separator. An absorption heat pump system having a control device for controlling the degree of opening of the expansion valve and the pressure reducing means in accordance with a signal from a liquid level detecting means provided in each of a liquid device and a gas-liquid separator. 6. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which the inlet of the regenerator is sequentially connected, and a supercooling heat exchanger is located between the concentrated solution tank and the solution pump. An absorption heat pump system in which a cooling water outlet is connected to a cooling water inlet of the absorber by a cooling water connection pipe. 7. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which the inlet of the regenerator is sequentially connected, and a supercooling heat exchanger is located between the concentrated solution tank and the solution pump. The cooling water outlet is connected to the cooling water inlet of the absorber by a cooling water connecting pipe, a check valve is provided on the cooling water connecting pipe, and a three-way valve is provided on the cooling water inlet pipe of the supercooling heat exchanger. The three-way valve is connected to a downstream side of the check valve by a branch pipe, and the three-way valve is Absorption heat pump system for switching by the controller in response to the signal of the supercooling sensing means provided on the inlet side of the serial solution pump. 8. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which an inlet of the regenerator is sequentially connected. The concentrated solution tank is provided below the liquid receiver and the gas-liquid separator, and the expansion valve and the pressure reducing means are provided. And a low pressure circuit section partitioned by the inlet of the solution pump and a low pressure detection section. Control means in response to the signal of Absorption heat pump system to control. 9. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and at least a concentrated solution flow path to which the inlet of the regenerator is sequentially connected. The inlet and the outlet of the solution pump are connected by a bypass pipe. An absorption heat pump system controlled by a control device in accordance with a signal from a regeneration temperature detecting means provided at an outlet of the regenerator. 10. A regenerator, a gas-liquid separator communicating with an outlet of the regenerator, a gas side outlet of the gas-liquid separator, a condenser, a liquid receiver, an expansion valve, an evaporator, and a gas side of an absorber. A refrigerant flow path in which inlets are sequentially connected, a dilute solution flow path in which a liquid-side outlet of the gas-liquid separator, a decompression means, and a liquid-side inlet of the absorber are sequentially connected; an outlet of the absorber, a concentrated solution tank , A solution pump, and a concentrated solution flow path to which the inlet of the regenerator is sequentially connected, and a heating means provided in each of the gas-liquid separator and the receiver is provided with a liquid level detection device provided in the concentrated solution tank. An absorption heat pump system controlled by a control device according to a detection signal of the means.