JP3321012B2 - Control device of absorption refrigeration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating apparatus having an absorption cycle using an aqueous solution of lithium bromide or the like as an absorption liquid, wherein noncondensable gas generated in the absorption cycle is stored in a gas storage tank. The present invention relates to control for storing and storing under pressure using the discharge pressure of an absorbent pump.

[0002]

2. Description of the Related Art In an absorption-type refrigeration system, a low-concentration absorbent is heated and boiled by a burner in a regenerator to separate a high-concentration absorbent and refrigerant vapor, and the refrigerant vapor is cooled by a condenser and cooled. Becomes When the high-concentration absorbing liquid whose concentration is increased by the regenerator is sprayed on the surface of the absorbing coil in the absorber, and the refrigerant liquid is sprayed on the evaporating coil in the evaporator, the high-concentration absorbing liquid is spread on the surface of the absorbing coil. It absorbs refrigerant vapor and generates heat. The heat generated when the absorbing liquid absorbs the refrigerant vapor on the surface of the absorption coil moves to the cooling tower provided outside by the cooling water for exhaust heat passing by the operation of the pump in the absorption coil, and the cooling tower Released at

At this time, on the surface of the evaporating coil, the refrigerant liquid evaporates by removing heat of vaporization from the cooling water passing through the evaporating coil, and the cooling water whose heat has been removed by the evaporating coil is turned into a cooling target by operating the pump. It circulates through the provided heat exchanger and becomes a cooling source in the cooling object. Conversely, the cooling water whose temperature has increased in the heat exchanger is cooled again by the evaporating coil. The absorption cycle is configured so that the absorbent, which has absorbed the refrigerant in the absorber and reduced in concentration, returns to the regenerator by the absorbent pump.

[0004] In the above structure, stainless steel material having high corrosion resistance to lithium bromide used for the absorbing solution is used for each of the appliances and piping such as the regenerator and the absorber constituting the absorption cycle. Further, the absorbing solution contains an inhibitor (corrosion inhibitor) for preventing corrosion of each device.

However, these cannot completely eliminate the chemical reaction in the absorption cycle, and a non-condensable gas (specifically, hydrogen gas) is generated by a chemical reaction between the absorbing solution and each component. Accumulates in the absorption cycle during prolonged use. Therefore, the non-condensable gas generated in the absorption cycle is extracted at a low pressure (about 1/120 of the atmospheric pressure) in the absorber during the operation of the absorption cycle, separated from the refrigerant vapor, and then subjected to gas storage. Keep it indoors,
During maintenance work of the absorption refrigeration system, the non-condensable gas in the gas storage chamber is sucked by a vacuum pump so that the normal operation of the absorption cycle is maintained for a long time.

In the absorption refrigeration system configured as described above, since the pressure of the non-condensable gas stored in the gas storage chamber communicating with the low-pressure absorber is low, the same amount of non-condensable gas is stored. In such a case, a large volume is required and a large gas storage room is required, which has been an obstacle to downsizing the absorption refrigeration apparatus. For this reason, the applicant of the present application has previously proposed a structure of a high-pressure storage tank for storing under high pressure by using the discharge pressure of an absorbing liquid pump in order to reduce the size of the device.

On the other hand, in the absorption refrigeration system, if the concentration and temperature of the absorption liquid in the absorption cycle are not uniform, crystallization may occur in the absorption cycle.
At the end of the absorption cycle operation, after the heating means such as the burner is stopped, a dilution operation in which the absorbent pump is continuously operated is performed until the temperature in the regenerator falls below a predetermined temperature. Will be Since this dilution operation is intended to make the absorption cycle uniform, the rotation speed of the absorption liquid pump is switched to a lower rotation speed than the rotation speed at the time of operation when the operation is completed, and the temperature in the regenerator is reduced. As it drops,
The rotation speed of the absorbent pump is gradually reduced.

[0008]

As described above, when the dilution operation is performed at the end of the operation of the absorption cycle, the rotation speed of the absorbent pump gradually decreases during the dilution operation, and the discharge pressure thereof also gradually decreases. The airtightness in the high-pressure storage tank is ensured by a check valve, assuming that the check valve ball seats smoothly on the valve seat when the discharge pressure of the absorbent pump suddenly drops during operation stop. Therefore, when the absorbent pump is stopped in a state where the discharge pressure is reduced as in the dilution operation, the check valve ball of the check valve does not securely seat on the valve seat,
The reliability of the airtightness is greatly reduced, and the pressure in the tank becomes low due to the airtight leakage. Further, since the pump is stopped in a low pressure state, the pressure in the tank does not become high.

Therefore, if the airtightness of the high-pressure storage tank is reduced by the dilution operation in which the operation is not terminated with the discharge pressure of the absorbent pump being high, the non-condensable gas flows back into the absorption cycle to reduce the capacity. May occur or, in some cases, cause an abnormality. In addition, since the tank is not compressed, it is difficult to reduce the size of the tank. It is to be noted that operating the pump discharge pressure at a high pressure in the dilution operation means that heating is stopped during the dilution operation, and only a small amount of the absorbing liquid increases (with residual heat) in the absorber. If it is sent too much to the high-temperature regenerator, it will not be possible to increase the pressure because the absorption liquid pump runs idle.

The present invention provides a control apparatus for an absorption refrigeration system which can reliably store non-condensable gas generated in an absorption cycle in a small high-pressure storage tank and which does not cause any trouble in the operation of the absorption cycle. The purpose is to provide.

[0011]

According to the first and second aspects of the present invention, a regenerator for heating an absorbing liquid containing a refrigerant by a heating means to separate refrigerant vapor from the absorbing liquid, and a refrigerant separated by the regenerator. A condenser for cooling and condensing the vapor, and an evaporator for evaporating the refrigerant liquid condensed in the condenser under low pressure,
An absorber for absorbing the refrigerant vapor evaporated by the evaporator into an absorbent supplied from the regenerator, and a solution pump for returning the absorbent from the absorber to the regenerator for cooling the inside of the evaporator. Forming an absorption cycle for performing a cooling operation, a bleeding device provided in communication with the bottom of the absorber for extracting non-condensable gas generated in the absorption cycle, and a gas-liquid separation unit communicating with the bleeding device A non-condensable gas primary storage unit provided at an end of the gas-liquid separation unit for directly storing the non-condensable gas separated from the absorbing liquid, A non-condensable gas secondary storage unit that is provided in communication with a stop valve and stores the non-condensable gas at a higher pressure than the non-condensable gas primary storage unit; A discharge pressure application passage for applying a discharge pressure When the discharge pressure of the solution pump is not applied to the non-condensable gas primary storage unit, the non-condensable gas separated by the gas-liquid separation unit is stored in the non-condensable gas primary storage unit, and the non-condensable gas is stored. When the discharge pressure of the solution pump is applied to the gas primary storage unit, the check valve is opened to store the noncondensable gas stored in the noncondensable gas primary storage unit into the noncondensable gas secondary storage unit. And a non-condensable gas storage for compressing and storing at a high pressure in the section, wherein at the end of the operation of the absorption cycle, the heating means is stopped and then the solution pump is continuously operated. In the control device of the absorption refrigeration apparatus having control means for performing a dilution operation, the control means may drive and stop the solution pump at a high rotational speed for a predetermined time immediately after the end of the dilution operation. As a means

The high rotation speed of the solution pump during a predetermined time after the dilution operation may be set to a higher rotation speed than the rotation speed of the solution pump during the dilution operation controlled to a low rotation speed as described in claim 1. As set forth in claim 2, it is preferable to set the solution pump to a substantially maximum rotation speed at which the largest discharge pressure is obtained.

According to the present invention, according to the present invention, in the regenerator, the low-concentration absorbing liquid is heated and boiled by using a heating means such as a burner, so that the high-concentration absorbing liquid and the refrigerant vapor are separated from each other. Is cooled by a condenser to become a refrigerant liquid. In the evaporator, the refrigerant liquid evaporates by removing heat of vaporization from the cooling water,
The cooling water cooled by the evaporator circulates through a heat exchanger provided on the object to be cooled and becomes a cooling source in the object to be cooled. In the absorber, the high-concentration absorbent absorbs the refrigerant vapor generated in the evaporator to become a low-concentration absorbent, and the absorbent, which has absorbed the refrigerant in the absorber and reduced in concentration, returns to the regenerator by the pump.

In the above-described absorption cycle, the absorbing solution causes a chemical reaction with the stainless steel constituting each device such as the regenerator and the absorbing device, thereby generating hydrogen gas as a non-condensable gas which does not condense into the absorbing solution. Most accumulates in absorbers that are at low pressure. Here, the non-condensable gas in the absorber is extracted by the bleeding device in a state where the absorbing liquid is mixed, and is guided to the gas-liquid separation unit. In the gas-liquid separation section, the non-condensable gas separated from the absorption liquid is stored in the non-condensable gas primary storage section. Above the non-condensable gas primary storage, a non-condensable gas secondary storage is provided via a check valve.

Accordingly, when the discharge pressure of the solution pump is not applied and the pressure in the non-condensable gas primary storage is low,
The check valve is closed, and the non-condensable gas separated in the gas-liquid separation unit is stored as it is in the non-condensable gas primary storage unit. When the pressure in the non-condensable gas primary storage unit increases due to the start of operation and the discharge pressure of the solution pump increases, the check valve opens, and the non-condensable gas in the non-condensable gas primary storage unit is checked. It is discharged to a non-condensable gas secondary storage unit through a valve.
When the pump stops and the pressure in the non-condensable gas primary storage decreases, the check valve closes while maintaining the secondary storage at high pressure,
The non-condensable gas discharged to the non-condensable gas secondary storage unit is
Can be stored at high pressure.

In the operation of the absorption cycle, the solution pump repeatedly starts and stops according to the cooling load, and each time the solution pump is operated, the non-condensable gas is discharged to the non-condensable gas secondary storage unit, and the high pressure is applied. And stored in small volumes. When the operation of the absorption cycle is stopped, a dilution operation is performed to prevent crystallization of the absorption liquid in the absorption cycle. In the dilution operation, in many cases, the solution pump is driven at a lower rotation speed than during the normal operation. The dilution operation is
The operation is continuously performed until the temperature inside the regenerator or the like becomes low. As a result, during the dilution operation, the discharge pressure of the solution pump decreases, and the pressure in the non-condensable gas secondary storage section of the non-condensable gas storage gradually decreases. Further, when the pump is stopped, the valve body such as a ball valve of the check valve gently seats on the valve seat, and does not immediately seat, the airtightness is reduced,
The pressure in the secondary storage unit is reduced due to the leak.

According to the first and second aspects of the present invention, the solution pump is driven at a rotation speed higher than the rotation speed at the end of the dilution operation or at a substantially maximum rotation speed for a predetermined time immediately after the completion of the dilution operation. While driving at a high rotation speed, the non-condensable gas can be compressed at a high pressure in the non-condensable gas secondary storage section of the non-condensable gas storage, and the rotation speed of the solution pump is changed from the driving state at a high rotation speed. Since the stop is performed at once without lowering, the valve body of the check valve is correctly and airtightly seated on the valve seat at the moment of the stop. Thereby, the airtightness of the noncondensable gas secondary storage unit is secured while the inside of the noncondensable gas secondary storage unit is at a high pressure, so that even after the dilution operation of the absorption cycle is completed, the noncondensable gas is stored. The high pressure can be stored in the non-condensable gas secondary storage unit. Therefore, the airtightness of the non-condensable gas in the check valve can be ensured, and the non-condensable gas can be prevented from flowing back to the absorption cycle, so that the capacity of the absorption cycle during operation and the abnormal stop do not occur. Further, since the inside of the secondary storage unit is compressed to a high pressure, the size can be reduced.

According to a third aspect of the present invention, in the first and second aspects, the absorption cycle includes a switching absorbent line for connecting the regenerator and the absorber and having a solenoid on-off valve on the way.
The control means is a technical means for opening the electromagnetic on-off valve during the predetermined time.

Thus, in the third aspect, the solenoid on-off valve is opened during the predetermined time. Thereby, the absorbing liquid is
Instead of the circulation path of the absorption cycle described above, the water is supplied from the regenerator to the evaporator through the switching absorbent line, and is circulated from the evaporator to the regenerator again by the solution pump via the absorber. As a result, the absorbent in the regenerator circulates quickly to the evaporator, so that the absorber is not emptied and the discharge pressure does not become insufficient. The airtightness by closing the stop valve can be maintained.

According to a fourth aspect, in the first to third aspects,
The absorption refrigerating apparatus constitutes an air conditioner having a cold / hot water circuit for transmitting heat in the evaporator to the room by cold / hot water, and the control unit closes the electromagnetic on-off valve. Activating the absorption cycle, performing a cooling operation to cool the room with cold and hot water cooled in the evaporator, and with the electromagnetic on-off valve opened, the high-temperature absorbing liquid heated by the regenerator Is supplied to the evaporator, performing a heating operation of heating the room with cold and hot water heated in the evaporator, and also at the end of the heating operation, while performing the dilution operation, after the end of the dilution operation, Technical means is to drive and stop the solution pump at a rotation speed higher than the rotation speed at the end of the dilution operation for a predetermined time.

According to a fifth aspect, in the first to third aspects,
The absorption refrigerating apparatus constitutes an air conditioner having a cold / hot water circuit for transmitting heat in the evaporator to the room by cold / hot water, and the control unit closes the electromagnetic on-off valve. Activating the absorption cycle, performing a cooling operation to cool the room with cold and hot water cooled in the evaporator, and with the electromagnetic on-off valve opened, the high-temperature absorbing liquid heated by the regenerator Is supplied to the evaporator, performing a heating operation of heating the room with cold and hot water heated in the evaporator, and also at the end of the heating operation, while performing the dilution operation, after the end of the dilution operation, Technical means is to drive and stop the solution pump at a substantially maximum rotation speed for a predetermined time.

According to the fourth and fifth aspects of the present invention, a heating operation for supplying the absorbing liquid heated in the regenerator to the evaporator, heating the cold and hot water in the evaporator, and heating the room is performed. When the heating operation is completed, the solution pump is continuously driven to perform the dilution operation with the heating unit stopped, and immediately after the dilution operation is completed, the solution pump is rotated at a speed higher than the rotation speed at the end of the dilution operation. The motor is driven for a predetermined time at a rotation speed or a substantially maximum rotation speed and stopped. As a result, a high pressure is applied to the non-condensable gas storage unit every time the operation is completed, not only at the time of the cooling operation by the absorption cycle but also at the time of the heating operation, so that the non-condensable gas in the storage tank is removed. Since the condensable gas is compressed and the airtightness of the check valve can be secured, the non-condensable gas stored in the non-condensable gas container is
It can be continuously stored at a high pressure, and does not cause a problem due to backflow of the non-condensable gas into the absorption cycle.
Further, the size of the tank can be reduced.

[0023]

FIG. 1 shows a first embodiment of an air conditioner using a control device for an absorption refrigeration system according to the present invention. The air conditioner includes an outdoor unit 100 as an absorption refrigeration unit and an indoor unit RU. The outdoor unit 100 includes a refrigerator main unit 101 and a cooling tower (cooling tower) CT. Controlled.

The refrigerator main body 101 forms an absorption cycle of a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid, and includes a high-temperature regenerator 1 provided with a gas burner B as a heating means below the high-temperature regenerator 1. A low-temperature regenerator 2 disposed so as to cover the outside of the low-temperature regenerator 1; and an absorber 3 and an evaporator 4 double disposed toward the outer periphery of the low-temperature regenerator 2. And a condenser 5 disposed on the outer periphery of the low-temperature regenerator 2 and above the absorber 3 through several passages.

The high-temperature regenerator 1 is provided above the heating tank 11 heated by the gas burner B with a medium-concentration absorbent separating cylinder 1.
2, a vertical cylindrical airtight refrigerant recovery tank 10 is provided so as to cover the outer periphery of the medium-concentration absorbing liquid separation tube 12 from above. As a result, in the high-temperature regenerator 1, the low-concentration absorbing liquid accommodated in the heating tank 11 is heated by the gas burner B to evaporate water in the low-concentration absorbing liquid to absorb medium-concentration as refrigerant vapor (water vapor). The medium-concentration absorbing liquid concentrated by the evaporation of the refrigerant vapor is separated into the outside of the liquid separation tube 12, leaving the storage part 121 inside the medium-concentration absorption liquid separation tube 12, and the separated refrigerant vapor is collected in the refrigerant recovery tank 10. I do.

The low-temperature regenerator 2 is a vertical cylindrical low-temperature regenerator case 2 eccentrically installed on the outer periphery of the refrigerant recovery tank 10.
0, a refrigerant vapor outlet 21 is provided around the ceiling of the low-temperature regenerator case 20. Low temperature regenerator case 20
The top of the ceiling is connected to the storage part 121 of the middle-concentration absorbent separation cylinder 12 via the heat exchanger H by the middle-concentration absorbent flow path L1.

In the medium-concentration absorbent flow path L1, the storage section 12
An orifice (not shown) for limiting the flow rate of the medium concentration absorbing liquid flowing from 1 to the low temperature regenerator 2 is provided.
The medium-concentration absorbent is supplied and discharged into the low-temperature regenerator case 20 by a pressure difference from the medium-concentration absorbent separation cylinder 12. Thereby, in the low-temperature regenerator 2, the medium-concentration absorbing liquid supplied into the low-temperature regenerator case 20 is reheated by using the outer wall of the refrigerant recovery tank 10 as a heat source. Is separated into a refrigerant vapor and a high-concentration absorbing liquid by the gas-liquid separating section 22, and the high-concentration absorbing liquid is stored in the high-concentration absorbing liquid receiving section 23.

At the lower part of the outer periphery of the low-temperature regenerator case 20, a vertical cylindrical airtight and evaporating / absorbing case 30 is disposed, and at the upper part of the outer periphery, a condenser case 50 is concentrically arranged. The low-temperature regenerator case 20 and the evaporating / absorbing case 30 are integrally welded to each other at the bottom plate portions 13 to form the refrigerator main body 101. The low-temperature regenerator case 20 communicates with the inside of the condenser case 50 via the refrigerant vapor outlet 21 and the gap 5A.

The absorber 3 is provided with an absorption coil 31 which is wound in a vertical cylindrical shape inside an evaporating / absorbing case 30 and through which cooling water for exhaust heat flows, and above the absorption coil 31. A high-concentration absorbent spraying device 32 for dispersing the high-concentration absorbent to the absorption coil 31 is provided. The high-concentration absorbent sprayer 32 is provided with a high-concentration absorbent supplied from an opening of a high-concentration absorbent flow path L2 connected to the high-concentration absorbent reception section 23 of the low-temperature regenerator 2 via the heat exchanger H. In the cooling coil CT during the cooling operation.
The cooling water for exhaust heat cooled in the above is circulated.

In the absorber 3, the high-concentration absorbent flows in from the high-concentration absorbent flow path L 2 due to the pressure difference, and the high-concentration absorbent flowing in is absorbed by the high-concentration absorbent dispersion device 32 by the absorption coil 31.
And adheres to the surface of the absorption coil 31 to form a thin film, flows downward by the action of gravity, and absorbs the refrigerant vapor generated in the evaporator 4 to become a low-concentration absorption liquid. When absorbing the refrigerant vapor, heat is generated on the surface of the absorption coil 31, but is cooled by the cooling water for exhaust heat circulating through the absorption coil 31. The bottom 33 of the absorber 3 is connected to the bottom of the heating tank 11 by a low-concentration absorbent flow path L3 to which a heat exchanger H and an absorbent pump P1 are attached.
The low concentration absorbent in the absorber 3 is supplied into the heating tank 11 through the heat exchanger H by the operation of

In the interior of the absorber 3, non-condensable gas (hydrogen gas) generated in the absorption cycle and stored in the absorber 3
A bleeding device 80 for sucking air is provided. The bleeding device 80 is provided with an suction conduit 82 having a smaller diameter than the suction port 81 on the extension of the suction port 81 opened in the absorber 3, and inside the suction port 81, the absorption communicating with the discharge side of the absorbent pump P <b> 1. The liquid discharge pipe 83 is provided, and when the absorbing liquid is discharged from the end of the absorbing liquid discharge pipe 83 toward the suction port 81 by the discharge pressure of the absorbing liquid pump P1, refrigerant vapor between the suction port 81 and It has a structure in which a gas component such as a non-condensable gas is sucked and mixed into the absorbing liquid by a so-called ejector effect.

The suction conduit 82 extended from the bleed device 80
Is a gas-liquid separation tube 8 formed of a substantially J-shaped (or substantially U-shaped) Uritani tubular body provided in communication with the bottom 33 of the absorber 3.
4 and constitutes a gas-liquid separator together with the gas-liquid separation tube 84, and has a substantially J-shaped (or substantially U-shaped) shape like the gas-liquid separation tube 84. Valley 8 inside
It opens at the position after 5. The non-condensable gas storage 90 is connected to the opposite end of the gas-liquid separation tube 84 which is the end of the gas-liquid separator.

As shown in FIGS. 2 and 3, the non-condensable gas storage 90 serves as a non-condensable gas primary storage unit 91 for storing the separated low-pressure non-condensable gas.
4 is provided with a direct storage portion 92 having an open end and an indirect storage portion 93 provided outside the direct storage portion 92 so as to cover the direct storage portion 92.
Above the indirect storage unit 93, a non-condensable gas secondary storage unit 94 is provided to store the low-pressure non-condensable gas stored in the non-condensable gas primary storage unit 91 at a high pressure. The absorption liquid separated by the gas-liquid separator acts to make the liquid level in the absorber 3 and the liquid level in the gas-liquid separation pipe 84 the same. Is returned to the absorber 3 via the gas-liquid separation pipe 84.

In the non-condensable gas primary storage section 91, at the bottom of the direct storage section 92, a check valve 9 which is opened when the pressure in the direct storage section 92 is higher than the pressure in the indirect storage section 93 outside thereof.
5 is provided at the bottom of the indirect storage unit 93, and is connected to the discharge side of the absorption liquid pump P1 to apply a discharge pressure of the absorption liquid discharged from the absorption liquid pump P1. 96 are connected.

With the above-described structure, the non-condensable gas primary storage section 91 holds the check valve 95 during the operation of the absorbing liquid pump P1 such that the pressure in the direct storage section 92 <the pressure in the indirect storage section 93. Is closed, and the non-condensable gas separated by the gas-liquid separator 84 is temporarily stored directly in the storage 92, and the absorbent pump P
When 1 stops and the pressure in the indirect storage unit 93 decreases,
The check valve 95 is opened by the pressure in the direct storage unit 92, and the non-condensable gas in the direct storage unit 92 is discharged into the indirect storage unit 93. Normally, the pressure of the non-condensable gas stored in the direct storage unit 92 is about 40 mmHg,
When 1 stops, the pressure in the indirect storage unit 93 becomes the same as the pressure in the absorber 3 (for example, 6.5 mmHg), and the non-condensable gas in the direct storage unit 92 is removed from the indirect storage unit. 9
3 is discharged.

On the other hand, in the non-condensable gas secondary storage unit 94,
Connection line 97 connecting between the upper part of the indirect storage part 93
Is provided with a check valve 98. The check valve 98 opens when the discharge pressure of the absorbent pump P <b> 1 is applied to the indirect storage unit 93, and pressurizes the non-condensable gas in the indirect storage unit 93 into the non-condensable gas secondary storage unit 94 at high pressure. The non-condensable gas in the non-condensable gas secondary storage part 94 is prevented from flowing back to the indirect storage part 93 by closing the non-condensable gas secondary storage part 94 when the pump is stopped.

The evaporator 4 is provided on the outer periphery of a vertical cylindrical partition wall 40 provided with a plurality of communication ports (not shown) provided on the outer periphery of the absorption coil 31 in the evaporator / absorber case 30. A vertical cylindrical evaporating coil 41 through which cold and hot water flows is provided, and a refrigerant liquid sprayer 42 is attached above the evaporating coil 41. The bottom portion 43 of the evaporator 4 absorbs the medium concentration by a heating absorbent flow path L4, which is a switching absorbent liquid passage having a cooling / heating switching valve 6 which is an electromagnetic switching valve for switching between a cooling operation and a heating operation. It is in communication with the storage part 121 of the liquid separation tube 12.

In the evaporator 4, when the refrigerant liquid is dropped on the evaporating coil 41 from the refrigerant liquid spraying tool 42 during the cooling operation,
The dropped refrigerant liquid wets the surface of the evaporating coil 41 by surface tension to form a film, and the evaporating liquid having a low pressure (for example, 6.5 mmHg) descends downward by the action of gravity.
The vaporization heat is taken from the evaporator coil 41 in the absorption case 30 to evaporate, and the air-conditioning cold / hot water flowing in the evaporator coil 41 is cooled.

The condenser 5 is provided with a cooling coil 51 in which cooling water for exhaust heat cooled by the cooling tower CT circulates inside a condenser case 50. Condenser case 50
The bottom portion 14 of the refrigerant recovery tank 10 is provided by a refrigerant flow path L5 provided with an orifice (not shown) for restricting the flow rate of the refrigerant from the refrigerant recovery tank 10 to the condenser case 50.
And the refrigerant vapor outlet 21 and the gap 5A
And the refrigerant is supplied by a pressure difference (about 70 mmHg in the condenser case).

In the condenser 5, the refrigerant vapor supplied to the condenser case 50 is cooled by the cooling coil 51 and liquefied. The lower part of the condenser 5 and the refrigerant liquid disperser 42 disposed above the evaporator coil 41 of the evaporator 4 are connected to the refrigerant liquid supply path L
It communicates with 6. The liquefied refrigerant liquid is supplied to the refrigerant liquid supply passage L
6 through the refrigerant cooler 52 provided in the refrigerant liquid sprayer 42
Supplied to

With the above configuration, when the cooling / heating switching valve 6 is closed, the absorbing liquid flows from the high-temperature regenerator 1 to the medium-concentration absorbing liquid channel L1 to the low-temperature regenerator 2 to the high-concentration absorbing liquid channel. L2 →
Absorber 3 → absorbent pump P1 → low concentration absorbent flow path L3 →
Circulation is performed in the order of the high-temperature regenerator 1. The refrigerant is a high-temperature regenerator 1 (refrigerant vapor) → refrigerant flow path L5 (refrigerant vapor) or a low-temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant supply path L6 (refrigerant liquid) → refrigerant Cooler 52 (refrigerant liquid) → refrigerant liquid sprayer 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3 (absorbent liquid) → absorbent pump P1 → low concentration absorbent liquid flow path L
Circulation is performed in the order of 3 → high temperature regenerator 1.

The above-described absorption coil 31 of the absorber 3 that exchanges heat with the absorption liquid and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. The cooling water circulation path is formed by being connected to the CT. In this cooling water circuit, the absorption coil 3
A cooling water pump P2 for sending cooling water into the continuous coil is provided in a cooling water flow path 34 between the inlet of the cooling tower CT and the cooling tower CT.
The cooling water which passes through the continuous coil by the operation of the cooling water pump P2 absorbs the heat of absorption by the absorption coil 31 and the heat of condensation by the cooling coil 51, and becomes relatively high in temperature. Supplied to CT.

With the above configuration, during the cooling operation, the cooling water in the cooling tower CT is operated in the order of the cooling tower CT → the cooling water pump P2 → the absorption coil 31 → the cooling coil 51 → the cooling tower CT by the operation of the cooling water pump P2. Circulate. In the cooling tower CT, self-cooling is performed in which the falling cooling water is partially evaporated into the atmosphere to cool the remaining cooling water.
An exhaust heat cycle is formed in which the heat is released into the atmosphere to lower the temperature. Note that the evaporation from water is promoted by blowing air from the cooling fan S.

The indoor unit R is provided in the evaporator coil 41 of the evaporator 4.
The air-conditioning heat exchanger 44 provided in U is connected by a cold / hot water flow path 47, and the cold / hot water pump P3 is connected to the cold / hot water flow path 47.
Is provided. With the above configuration, the evaporating coil 41
The low temperature hot and cold water circulates in the order of the evaporating coil 41 → the cold and hot water channel 47 → the air conditioning heat exchanger 44 → the cold and hot water channel 47 → the cold and hot water pump P3 → the evaporating coil 41.

The indoor unit RU is provided with an air-conditioning heat exchanger 44, and a convection fan 46 for allowing the room air to pass through the heat exchanger 44 and blowing the indoor air again.

The heating absorbent flow path L4 and the cooling / heating switching valve 6 are provided for the heating operation. During the heating operation, the cooling / heating switching valve 6 is opened to operate the absorbing liquid pump P1. Thus, during the heating operation, the high-temperature medium-concentration absorbing liquid in the medium-concentration absorbing liquid separation tube 12 flows into the evaporator 4 from the bottom 43 of the evaporator 4, and the cold / hot water in the evaporating coil 41 is heated. The heated and cooled water in the evaporating coil 41 is supplied from the cooled and heated water flow path 47 to the air conditioning heat exchanger 44 by the operation of the cooled and heated water pump P3, and serves as a heat source for heating. Further, the medium-concentration absorbent in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, passes through the low-concentration absorbent flow path L3,
It is returned to the heating tank 11 by the absorbent pump P1.

In the present embodiment, the absorbent pump P1 and the cold / hot water pump P3 are configured as tandem pumps driven by the same DC motor, and the absorbent pump P1 and the cold / hot water pump P3 are always They are driven simultaneously and at the same speed.

In the outdoor unit 100 having the above configuration, when the absorbent pump P1 operates during the cooling operation or the heating operation, the bleeding device 80 and the non-condensable gas storage 90 are connected to the bleeding device 80 as shown in FIG. Absorbent discharge pipe 8
The vapor refrigerant and the non-condensable gas in the absorber 3 are absorbed from the opening of the suction pipe 81 of the bleeding device 80 and mixed by the ejector effect of the absorbing liquid discharged from the suction pipe 3 toward the suction conduit 82. The non-condensable gas is led to the separation pipe 84 and separated from the absorbing liquid, and is stored directly in the storage unit 92.

At this time, since the discharge pressure of the absorbent pump P1 is applied to the indirect storage unit 93, the check valve 95 provided at the bottom of the direct storage unit 92 is closed, while the non-condensable gas The check valve 98 provided at the bottom of the secondary storage unit 94 is opened, and the non-condensable gas stored in the upper part together with the absorbing liquid in the indirect storage unit 93 is stored in the non-condensable gas secondary storage unit 94. Discharge and compress into.

During the cooling operation or the heating operation, when the room temperature reaches the set temperature and the gas burner B is stopped and the absorbing liquid pump P1 is temporarily stopped, the suction of the non-condensable gas by the bleeding device 80 is stopped. The discharge pressure of the absorbing liquid pump P1 is no longer applied to the indirect storage unit 93, and the pressure in the indirect storage unit 93 decreases.

As a result, as shown in FIG. 3, the check valve 95 is opened by the pressure in the direct storage section 92 and the direct storage section 9 is opened.
The non-condensable gas in 2 is discharged into the indirect storage unit 93 and stored above in the indirect storage unit 93, while the check valve 98 is closed by the high pressure in the non-condensable gas secondary storage unit 94. The non-condensable gas in the non-condensable gas secondary storage unit 94 does not return to the indirect storage unit 93, but is stored at a high pressure in the non-condensable gas secondary storage unit 94. When the absorbent pump P1 is restarted, the non-condensable gas is again separated from the absorbent and stored directly in the storage unit 92 as described above, and these operations are repeated during each operation.

Next, control of the control device 102 will be described. When a cooling operation or a heating operation is instructed by a controller (not shown) attached to the indoor unit RU, the control device 102 starts the cooling operation or the heating operation, and when a stop of each operation is instructed, Stop operation. In order to control these operations, the outdoor unit 100 includes a high-temperature regenerator 1
An absorption liquid temperature sensor 111 for detecting the temperature of the absorption liquid in the heating tank 11 and a cooling water temperature sensor 112 for detecting the temperature of the cooling water supplied into the absorption coil 31 of the absorber 3 are provided. ing. In addition, in the indoor unit RU,
Along with the operation switch, a temperature setter for setting the room temperature, a room temperature sensor, and the like are provided.

[Cooling Operation] First, the control of the cooling operation will be described. When the start of the cooling operation is instructed by the controller of the indoor unit RU, the cooling / heating switching valve 6 is closed, and the driving of the absorbent pump P1 is started as a predetermined cooling operation start control for preventing crystallization. Then, after the ignition operation of the gas burner B is performed, the combustion fan 104 and the gas proportional valve 105 are controlled to control the combustion amount of the gas burner B.

In the combustion amount control in the cooling operation, 1500 kca is set so that the temperature detected by the cold / hot water sensor 113 for detecting the temperature of the cold / hot water supplied to the indoor unit RU becomes 7 ° C.
Adjust the input of gas burner B between 1 / h and 4800 kcal / h. Further, as control of the absorbent pump P1, according to the temperature detected by the absorbent temperature sensor 111,
The rotational speed of the DC motor that drives the absorbent pump P1 is proportionally controlled so that the rotational speed is low when the temperature in the high-temperature regenerator 1 is low, and is higher when the temperature in the high-temperature regenerator 1 is higher. I do. FIG. 4 shows an example of the control characteristics of the DC motor during the cooling operation.

By the above control operation, the absorbing liquid and the refrigerant circulate in the absorption cycle, and the cold and hot water circulating in the evaporating coil 41 of the evaporator 4 is cooled and supplied to the indoor unit RU. In the indoor unit RU, by the operation of the convection fan 46, the indoor air is cooled when passing through the air-conditioning heat exchanger 44 and blown back into the room, thereby cooling the room.

Subsequently, the stop control of the cooling operation will be described below with reference to FIG. If the controller of the indoor unit RU instructs to stop the cooling operation (YES in step 100), the absorption pump P1 is continued after stopping the combustion of the gas burner B to dilute the absorption liquid in the absorption cycle. Then, a predetermined dilution operation in which the driving is performed is started (step 101). Also in the dilution operation, the rotation speed of the absorption liquid pump P1 is determined according to the absorption liquid temperature in the high-temperature regenerator 1. It should be noted that the rotation speed of the absorbent pump P1 in the dilution operation may be reduced by half, similarly controlled gradually in proportion to the absorption liquid temperature to gradually decrease, or controlled to a fixed rotation speed simply reduced by half in the dilution operation. Good.

When the temperature detected by the absorbent temperature sensor 111 is 12
When the temperature falls to 5 ° C. or less (Y in step 102)
ES), the cooling / heating switching valve 6 is opened (step 10).
3). As a result, the absorbent in the high-temperature regenerator 1 passes through the heating-use absorbent flow path L4, quickly passes through the evaporator 4 and the absorber 3, and circulates again to the high-temperature regenerator 1, and absorbs the absorbent. Rapid dilution and temperature reduction can be achieved. During this dilution operation, the combustion fan 10
4. The cooling water pump P2 and the cooling fan S are continuously driven.

When the temperature detected by the absorption liquid temperature sensor 111 further decreases to 110 ° C. or less (YES in step 104), it is determined that the dilution operation has ended, and the cooling water pump P2, the combustion fan 104, and the cooling fan S are stopped. (Step 105). At this time, the cooling / heating switching valve 6 maintains the valve open.

During the above-mentioned dilution operation, the discharge pressure of the absorbent pump P1 gradually decreases, and as the discharge pressure decreases, the non-condensable gas secondary storage of the non-condensable gas storage 90 is performed. The pressure in section 94 decreases.

For this reason, with the end of the dilution operation, the absorption pump P1 is driven at a high rotation speed (3300 rpm) for a certain time (for example, 10 seconds) with the cooling / heating switching valve 6 being opened (step 106). ).

As shown in FIG. 6, the cooling / heating switching valve 6 is closed when the operation of the absorbent pump P1 is stopped at a high rotation speed.

By driving the absorbing liquid pump P 1 at a high rotation speed, a high discharge pressure is applied to the indirect storage section 93 of the non-condensable gas storage 90 by a discharge pressure application pipe 96, and the connection pipe 97. The valve body leaves the valve seat when the non-condensable gas is discharged to the non-condensable gas secondary storage unit 94, and immediately sits on the valve seat as the pressure drops sharply due to the stoppage of the absorbent pump P1. I do. As a result, the inside of the non-condensable gas secondary storage unit 94 is maintained in a state where the non-condensable gas is compressed at a high pressure, and the valve seat of the check valve 98 is maintained in a high airtight state. The stop valve 98 will be closed. Therefore, even after that, high airtightness is maintained by the check valve 98, and backflow of the non-condensable gas into the absorption cycle does not occur.

[Heating Operation] Next, the heating operation will be described. In the heating operation, according to the instruction to start the heating operation,
The cooling / heating switching valve 6 is opened, and the absorption liquid pump P1 is driven to control the combustion amount of the gas burner B. When the temperature of the absorbent in the high-temperature regenerator 1 does not reach 50 ° C., the input is adjusted so that the gas burner B burns at 2000 kcal / h. In this case, based on the temperature detected by the cold / hot water sensor 113, 1500 kcal /
Adjust the input of gas burner B between h and 8000 kcal / h. On the other hand, in the control of the absorbent pump P1,
It is driven at a fixed (for example, 2000 rpm) fixed rotation speed.

At the end of the heating operation, the dilution operation and the driving of the absorbent pump P1 at a high rotational speed are performed. In the heating operation, at the start of the dilution operation, the absorption liquid pump P1 controlled at a fixed rotation speed is changed to a rotation speed corresponding to the absorption liquid temperature in the high-temperature regenerator 1; As in step 104 and subsequent steps, the dilution operation and the driving of the absorbent pump P1 at a high rotation speed are performed. Thereby, even after the heating operation is stopped, the non-condensable gas secondary storage unit 94 stores the non-condensable gas in a high-pressure and compressed state by driving the absorbent pump P1 at a high rotation speed, and The check valve 98 is closed in a state where high airtightness is secured in the valve seat of the check valve 98.

As described above, according to the present invention, the non-condensable gas generated in the absorption cycle is sucked by the bleeding device 80 in the absorber 3 and the non-condensable gas storage 90
Stored in At this time, the non-condensable gas storage 90 is
When the non-condensable gas sucked by the bleeding device 80 and separated by the gas-liquid separation pipe 84 is stored at the same low pressure in the direct storage unit 92 of the non-condensable gas primary storage unit 91, and the absorption liquid pump P1 is stopped. When the absorbent pump P1 is operated again, the discharge pressure of the absorbent pump P1 is applied to the indirect storage unit 93, and then the non-condensable liquid in the indirect storage unit 93 is discharged. By discharging the gas and the absorbing liquid at a high pressure to the non-condensable gas secondary storage unit 94, the gas and the absorbing liquid can be stored in the non-condensable gas secondary storage unit 94 at a higher pressure than the non-condensable gas primary storage unit 91. The volume for storing the non-condensable gas can be reduced.

In this case, even if the dilution operation is performed at the end of the operation and the discharge pressure of the absorbent pump P1 gradually decreases,
After the dilution operation is completed, the absorbent pump P1 is driven again at a high rotation speed, the check valve 98 is opened at a high discharge pressure, and then the absorbent pump P1 is stopped. 98 to quickly seat the valve body on the valve seat to ensure airtightness in the non-condensable gas secondary storage unit 94,
Even after the operation is stopped, the non-condensable gas can be stored in the non-condensable gas secondary storage unit 94 at a high pressure.

As a result, after the non-condensable gas stops operating,
There is no backflow in the absorption cycle, and no reduction in the capacity of the absorption cycle due to leakage of the non-condensable gas from the non-condensable gas secondary storage unit 94, and no abnormal stop during operation. Therefore, even when used for a long time, there is no problem caused by the non-condensable gas generated inside.
Further, since the non-condensable gas can be stored in the non-condensable gas secondary storage unit 94 in a state of being compressed at a high pressure,
It is possible to reduce the size of the tank.

Next, a second embodiment, which is a modification of the first embodiment, will be described. FIG. 7 shows a main part of the second embodiment. Second
In the embodiment, the structure of the non-condensable gas storage 90 is simplified, and the solenoid valve 910 is provided between the gas-liquid separation pipe 84 and the non-condensable gas storage 90. The same control as in the example is performed.

In the second embodiment, the non-condensable gas storage 90
In this embodiment, the non-condensable gas primary storage unit 91 is a gas storage chamber 91a having a simple tubular shape, and a non-condensable gas secondary storage unit 9 is provided in a pipe portion connected to the tubular gas storage room 91a.
A check valve 98 for preventing backflow of the non-condensable gas stored in No. 4 was provided. Further, a discharge pressure application pipe 96 for applying the discharge pressure of the absorption liquid pump P1 is connected to the gas storage chamber 91a near the upper portion of the solenoid valve 910, and the absorption liquid pump 96 is provided in the discharge pressure application pipe 96. An orifice 911 was provided to reduce the amount of absorbing liquid discharged from P1.

In the second embodiment having the above-described structure, the solenoid valve 910 is normally controlled to be opened while the absorbing liquid pump P1 is operating, and is sucked by the bleeding device 80 and separated by the gas-liquid separating pipe 84. The obtained non-condensable gas is stored in the gas storage chamber 91a via the solenoid valve 910. At this time, as for the discharge pressure from the discharge pressure application pipe 96, the absorption liquid in the absorber 3 is sucked by the absorption liquid pump P1, and the gas-liquid separation pipe 84
The check valve 98 is closed to escape into the absorber 3 through. Since the gas storage chamber 91a is tubular and has a small volume, the solenoid valve 910 is controlled to be closed at regular time intervals, and the inside of the gas storage chamber 91a is set to a high pressure by the discharge pressure of the absorbent pump P1, and the check valve 98 is set. Open the valve.

That is, when the discharge pressure of the absorption liquid pump P1 via the discharge pressure application pipe 96 is applied to the gas storage chamber 91a, the absorption liquid in the gas storage chamber 91a stores the non-condensable gas stored above. Push the check valve 98 open while compressing
The non-condensable gas is discharged into the secondary storage section 94. At this time, the non-condensable gas accumulates below the solenoid valve 910. Thereby, the non-condensable gas is stored in the non-condensable gas secondary storage unit 94.
Can be stored at high pressure. Therefore, the solenoid valve 91
After the valve 0 is closed, the solenoid valve 910 is controlled to open again to store the non-condensable gas in the gas storage chamber 91a, and the above is repeated during the operation of the absorbent pump P1.

In this embodiment, the solenoid valve 910 is required. However, since the non-condensable gas primary storage section 91 may be a tubular gas storage chamber 91a having a small volume, the non-condensable gas storage section 91a may be used.
In the entirety of 0, the physique can be reduced, and the size can be reduced.

Next, a third embodiment of the present invention will be described. FIG.
The third embodiment is shown in FIG. In the first to third embodiments, the bleeding device 80 is used as a structure for separating the non-condensable gas generated in the absorption cycle. However, in the third embodiment, the bleeding device 80 of the first embodiment is used. Instead, siphon container 800
Are shown. The siphon container 800
The non-condensable gas introduction pipe 801 opened at the lower part of the absorber 3 communicates with the middle part in the siphon container 800,
An inverted U-shaped (or inverted J)
And an absorbent discharge pipe 802 which is formed of a mountain-shaped tubular body having a U-shape and forms a siphon pipe.

The high-concentration absorbent in the high-concentration absorbent sprayer 32 for dropping the high-concentration absorbent supplied from the low-temperature regenerator 2 through the high-concentration absorbent flow path L2 into the absorption coil 31 is transferred to the siphon container 800. And the absorption liquid level in the siphon container 800 is set to the peak 8 of the absorption liquid discharge pipe 802.
03, the absorbing liquid and the non-condensable gas in the siphon container 800 are discharged from the absorbing liquid discharge pipe 802, and at that time, the vapor refrigerant and the non-condensable liquid in the absorber 3 are discharged from the non-condensable gas introducing pipe 801. Inhalation of inactive gas.

The absorption liquid discharge pipe 802 is disposed inside the gas-liquid separation pipe 84 composed of a valley tubular body as in the above-described embodiments to form a gas-liquid separator, and has passed through the valley 85. The non-condensable gas in the mixed absorbent is stored upward by gas-liquid displacement. In this embodiment, the siphon container 800
Is provided in the evaporating / absorbing case 30 in contact with the evaporating coil 41, and is cooled by cold and hot water passing through the evaporating coil 41, so that the vapor refrigerant in the siphon container 800 is absorbed by the absorbing liquid. Forming an absorber. Incidentally, the second embodiment may also be of the siphon type shown in the third embodiment.

As described above, according to the present invention, since the non-condensable gas is compressed at a high pressure and stored in the non-condensable gas storage unit 90, the storage volume can be reduced.
The size of the absorption refrigeration system can be reduced. In this case, even if the dilution operation is performed when the operation is stopped and the discharge pressure of the absorbent pump P1 gradually decreases, the non-condensation is performed by driving the absorbent pump P1 at a high rotational speed at the end of the dilution operation. The non-condensable gas is compressed at high pressure and the valve body of the check valve 98 is immediately seated on the valve seat to ensure airtightness in the non-condensable gas secondary storage unit 94. While the gas is kept at a high pressure, the non-condensable gas secondary storage 94
Can be stored. As a result, the tank type can be used, and the non-condensable gas does not flow back into the absorption cycle after the operation is stopped, and the non-condensable gas leaks from the non-condensable gas secondary storage unit 94. There is no reduction in the capacity of the absorption cycle and no abnormal stop during operation. Therefore, even when used for a long time, there is no problem caused by the non-condensable gas generated inside.

In the above embodiment, as the control for increasing the rotational speed after the end of the dilution operation, the rotational speed was changed from the low rotational speed to the high rotational speed immediately before the stop of the absorbing liquid pump. The control of the high rotational speed for a long time may be performed. Further, in the above embodiment, the absorption liquid pump is set to a high rotation speed when the dilution operation is stopped when the cooling operation or the heating operation is stopped.However, during the operation, when the room temperature reaches the set temperature. Alternatively, the present invention may also be applied at the end of the dilution operation when the absorption cycle is temporarily stopped (temperature control stop or thermostat stop).

In each of the above embodiments, the cooling tower CT of the cooling water flow path 34 is an open type in which a part of the cooling water is evaporated and the cooling water is self-cooled. A water cooling device in which a closed circuit in which water is not opened to the atmosphere may be formed. In the above embodiment, only the air conditioner heat exchanger 44 is provided in the indoor unit RU. However, in order to perform the dehumidifying operation without lowering the room temperature, the air once cooled by the air conditioner heat exchanger 44 is heated. The heating heat exchanger may be provided in parallel with the air conditioning heat exchanger 44. Although the air conditioner using the absorption refrigeration apparatus has been described in the above embodiment, the air conditioning apparatus may be used for other refrigeration apparatuses such as a refrigerator and a freezer. 2
It is not limited to a heavy utility and may be a single utility. The heating source may be an electric heater or an oil burner other than the gas burner.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner showing a first embodiment of a control device for an absorption refrigeration system of the present invention.

FIG. 2 is a partial configuration diagram of the air-conditioning apparatus during operation of an absorbent pump for explaining the operation of the non-condensable gas storage in the first embodiment.

FIG. 3 is a partial configuration diagram when the absorbent pump of the air conditioner is stopped for explaining the operation of the non-condensable gas storage in the first embodiment.

FIG. 4 is a characteristic diagram showing control characteristics of the absorbent pump in the cooling operation of the control device of the first embodiment.

FIG. 5 is a flowchart for explaining a control operation of the control device according to the first embodiment at the end of cooling operation.

FIG. 6 is a time chart for explaining a control operation of the control device of the first embodiment at the end of the cooling operation.

FIG. 7 is a partial configuration diagram of an air conditioner showing a second embodiment of the absorption refrigeration system of the present invention.

FIG. 8 is a schematic configuration diagram of an air conditioner showing a third embodiment of the absorption refrigeration system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator (regenerator) 2 Low temperature regenerator (regenerator) 3 Absorber 33 Bottom part (bottom part of absorber) 4 Evaporator 5 Condenser 6 Cooling / heating switching valve (electromagnetic on-off valve) 80 Extraction device 82 Suction pipe (air) Liquid separation section) 84 Gas-liquid separation pipe (gas-liquid separation section) 90 Non-condensable gas storage 91 Non-condensable gas primary storage 94 Non-condensable gas secondary storage 96 Discharge pressure application pipe (discharge pressure application passage) 98 Check valve 100 Outdoor unit (absorption refrigeration unit) 102 Control unit (control unit) B Gas burner (heating unit) P1 Absorbent pump (solution pump) L4 Heating absorbent flow path (switching absorbent pipe)

Continuation of the front page (56) References JP-A-2-247464 (JP, A) JP-A-8-271083 (JP, A) JP-A-8-28998 (JP, A) JP-A-10-89814 (JP, A) , A) Japanese Utility Model Showa 54-71756 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 43/04 F25B 15/00 306

Claims (5)

(57) [Claims] 1. A regenerator for heating an absorbing liquid containing a refrigerant by heating means to separate refrigerant vapor from the absorbing liquid, a condenser for cooling and condensing the refrigerant vapor separated by the regenerator, and the condenser An evaporator for evaporating the refrigerant liquid condensed in the evaporator under low pressure; an absorber for absorbing the refrigerant vapor evaporated in the evaporator into an absorbent supplied from the regenerator; and an absorbent from the absorber to the regenerator. Forming an absorption cycle for performing a cooling operation for cooling the inside of the evaporator from a solution pump for returning the non-condensable gas generated in the absorption cycle provided in communication with the bottom of the absorber. A gas-liquid separator communicating with the gas-extractor, a non-condensable gas primary provided at an end of the gas-liquid separator for directly storing the non-condensable gas separated from the absorbing liquid. Storage, primary of the non-condensable gas Through a check valve is provided in communication with the upper compared, incondensable gases secondary reservoir for storing the non-condensable gas at high pressure from the non-condensable gases primary reservoir,
A discharge pressure application passage for applying a discharge pressure of the solution pump to the non-condensable gas primary storage unit, wherein when the discharge pressure of the solution pump is not applied to the non-condensable gas primary storage unit, the gas-liquid The non-condensable gas separated in the separation unit is stored in the non-condensable gas primary storage unit, and when the discharge pressure of the solution pump is applied in the non-condensable gas primary storage unit,
A non-condensable gas storage for opening the check valve and compressing and storing the non-condensable gas stored in the non-condensable gas primary storage at a high pressure in the non-condensable gas secondary storage; And controlling the absorption refrigeration apparatus having a control means for performing a dilution operation for continuously operating the solution pump after stopping the heating means at the end of the operation of the absorption cycle. In the apparatus, immediately after the end of the dilution operation, the control unit drives and stops the solution pump at a rotation speed higher than the rotation speed at the end of the dilution operation for a predetermined time, and stops the solution pump. Control device. 2. A regenerator for heating an absorbing liquid containing a refrigerant by heating means to separate refrigerant vapor from the absorbing liquid, a condenser for cooling and condensing the refrigerant vapor separated by the regenerator, and the condenser. An evaporator for evaporating the refrigerant liquid condensed in the evaporator under low pressure; an absorber for absorbing the refrigerant vapor evaporated in the evaporator into an absorbent supplied from the regenerator; and an absorbent from the absorber to the regenerator. Forming an absorption cycle for performing a cooling operation for cooling the inside of the evaporator from a solution pump for returning the non-condensable gas generated in the absorption cycle provided in communication with the bottom of the absorber. A gas-liquid separator communicating with the gas-extractor, a non-condensable gas primary provided at an end of the gas-liquid separator for directly storing the non-condensable gas separated from the absorbing liquid. Storage, primary of the non-condensable gas Through a check valve is provided in communication with the upper compared, incondensable gases secondary reservoir for storing the non-condensable gas at high pressure from the non-condensable gases primary reservoir,
A discharge pressure application passage for applying a discharge pressure of the solution pump to the non-condensable gas primary storage unit, wherein when the discharge pressure of the solution pump is not applied to the non-condensable gas primary storage unit, the gas-liquid The non-condensable gas separated in the separation unit is stored in the non-condensable gas primary storage unit, and when the discharge pressure of the solution pump is applied in the non-condensable gas primary storage unit,
A non-condensable gas storage for opening the check valve and compressing and storing the non-condensable gas stored in the non-condensable gas primary storage at a high pressure in the non-condensable gas secondary storage; And controlling the absorption refrigeration apparatus having a control means for performing a dilution operation for continuously operating the solution pump after stopping the heating means at the end of the operation of the absorption cycle. In the apparatus, the control means drives and stops the solution pump at a substantially maximum number of revolutions for a predetermined time immediately after the end of the dilution operation, and controls the absorption refrigeration apparatus. 3. The absorption cycle includes a switching absorbent line for connecting the regenerator and the absorber and having an electromagnetic on-off valve in the middle of the absorption cycle. 3. The control device for an absorption refrigeration system according to claim 1, wherein the on-off valve is opened. 4. The absorption refrigeration system comprises an air conditioner provided with a chilled / hot water circuit for transmitting heat in the evaporator to the room by chilled / hot water. Activating the absorption cycle with the valve closed, performing a cooling operation to cool the room with cold and hot water cooled in the evaporator, and heating with the regenerator with the electromagnetic on-off valve opened. The heated high-temperature absorbing liquid is supplied to the evaporator, and a heating operation for heating the room by the cold and hot water heated in the evaporator is performed.At the end of the heating operation, the dilution operation is performed. 4. The absorption refrigeration system according to claim 1, wherein after the operation is completed, the solution pump is driven and stopped at a rotation speed higher than the rotation speed at the end of the dilution operation for a predetermined time. Control device. 5. The air conditioning system according to claim 1, wherein the absorption refrigeration system includes a chilled / hot water circuit for transmitting heat in the evaporator to the room with chilled / hot water. Activating the absorption cycle with the valve closed, performing a cooling operation to cool the room with cold and hot water cooled in the evaporator, and heating with the regenerator with the electromagnetic on-off valve opened. The heated high-temperature absorbing liquid is supplied to the evaporator, and a heating operation for heating the room by the cold and hot water heated in the evaporator is performed.At the end of the heating operation, the dilution operation is performed. 4. The control device for an absorption refrigeration system according to claim 1, wherein after the operation is completed, the solution pump is driven to stop at a substantially maximum rotation speed for a predetermined time.