JP3209945B2 - Absorption air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to storage of non-condensable gas in an absorption air conditioner having an absorption cycle using an aqueous solution of lithium bromide or the like as an absorption liquid.

[0002]

2. Description of the Related Art In an air conditioner of an absorption type, during a cooling operation, 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 becomes a refrigerant liquid. When the high-concentration absorbing liquid 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 refrigerant liquid vaporizes from the cold and hot water passing through the evaporating coil on the evaporating coil surface. The cold and hot water, which has been deprived of heat and evaporated and has been deprived of heat by the evaporating coil, circulates through a heat exchanger provided on the object to be cooled by the operation of the pump and becomes a cooling source in the object to be cooled. Conversely, the cold / hot water whose temperature has increased in the heat exchanger is cooled again by the evaporating coil.

On the other hand, on the surface of the absorption coil, the high-concentration absorption liquid 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 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. During the heating operation, the cooling / heating switching valve provided in the heating absorbing liquid flow path communicating between the regenerator and the evaporator is opened, and the high-temperature absorbing liquid heated by the regenerator is evaporated. , The cold and hot water in the evaporation coil is heated and becomes a heating source to be heated.

[0004] In the above configuration, stainless steel and copper materials having high corrosion resistance to lithium bromide are used for each device such as a regenerator and piping constituting the absorption cycle. Contains an inhibitor (corrosion inhibitor) for preventing corrosion of each device. However, these cannot completely eliminate the chemical reaction in each device and piping in the absorption cycle, and the non-condensable gas (specifically, hydrogen gas) due to the chemical reaction between the absorbing solution and each component device. Occurs and accumulates in the absorption cycle during prolonged use. For this reason, the non-condensable gas generated in the absorption cycle is extracted in the evaporative absorption case during operation and stored in the gas storage chamber (gas storage tank). The normal operation of the absorption cycle is maintained over a long period of time by suctioning the non-condensable gas in the gas storage chamber with a vacuum pump.

[0005]

In the absorption-type air conditioner constructed as described above, when the high-temperature absorbing liquid is supplied during the heating operation and the vapor pressure in the evaporation absorption case rises to a high pressure, The pressure difference between the evaporation absorption case and the gas storage chamber becomes large, so that the absorbing liquid does not enter the gas storage chamber through the gas-liquid separation unit, and the non-condensable gas in the gas storage chamber does not flow back into the case. In order to achieve this, the height difference between the inside of the evaporation absorption case and the gas storage chamber is set large (2 m
(The gas storage room is disposed above) to the extent that there is a problem that the size is increased.

According to the present invention, the configuration for providing the gas storage chamber for storing the non-condensable gas can be reduced without increasing the size, and at the time of the heating operation, the absorption liquid infiltrates into the gas storage chamber and the accompanying impairment. An object of the present invention is to provide an absorption type air conditioner in which a backflow of a condensable gas is prevented.

[0007]

According to the present invention, a regenerator for heating an absorbing liquid containing a refrigerant to separate refrigerant vapor from the absorbing liquid, and cooling and condensing the refrigerant vapor separated by the regenerator. Condenser, an evaporator for evaporating the refrigerant condensed in the condenser under a low pressure, and a refrigerant vapor that is arranged in parallel with the evaporator in an evaporation absorption case and is evaporated from the evaporator and supplied from the regenerator. A cooling / heating switching valve which is opened during a heating operation while forming an absorption cycle from an absorber for absorbing the absorbing liquid to the absorbing liquid and a pump for returning the absorbing liquid from the absorber to the regenerator. In an absorption type air conditioner provided with a heating operation absorbing liquid pipe for supplying a high temperature absorbing liquid of the regenerator to the evaporator, the non-condensable gas in the evaporation absorbing case provided in the evaporation absorbing case is provided. Extraction unit to extract A non-condensable gas extraction device comprising a gas-liquid separation unit provided in communication with the bottom of the evaporation absorption case and separating the non-condensable gas extracted by the extraction unit from the absorbent, and the gas-liquid separation unit. Through a non-condensable gas primary storage for directly storing the non-condensable gas separated from the absorbing liquid, and a solenoid valve provided above the non-condensable gas primary storage. A noncondensable gas secondary storage unit provided above the solenoid valve for communicating and storing the noncondensable gas discharged from the noncondensable gas primary storage unit when the solenoid valve is opened; A technical means is provided that includes a gas storage tank, and that the electromagnetic valve is opened when the inside of the evaporative absorption case becomes a predetermined low pressure state after the cooling operation is started.

[0008]

According to the above construction, in the absorption air conditioner of the first aspect, during the cooling operation in which the absorption cycle is operated, the low-concentration absorbent is heated and boiled by using a heating means such as a burner in the regenerator to thereby increase the high-concentration absorbent. The absorbing liquid and the refrigerant vapor are separated, and the separated refrigerant vapor is cooled by the condenser to become the refrigerant liquid. In the evaporator, the refrigerant liquid evaporates by removing heat of vaporization from the cold and hot water, and the cold and hot water cooled by the evaporator circulates through a heat exchanger provided in the cooling target and becomes a cooling source in the cooling target. 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. During the heating operation, the absorbent heated by the regenerator is supplied to the evaporator through the heating operation absorbent liquid pipe,
After the heat exchange to the load in the evaporator, the heat is returned to the regenerator through the absorber arranged in the evaporative absorption case.

[0010] In each of the above operations, the absorbent is regenerated,
A chemical reaction occurs with the stainless steel and copper materials that make up each device such as an absorber, and hydrogen gas is generated as a non-condensable gas that does not condense into the absorbing liquid. Is accumulated in In the non-condensable gas bleeding device, the non-condensable gas in the evaporation absorption case is extracted by the bleeding unit in a state in which the refrigerant vapor and the absorbing liquid are mixed, and is guided to the gas-liquid separation unit. In the gas-liquid separation section, the non-condensable gas from which the absorption liquid has been separated is stored in the upper non-condensable gas primary storage section.

An electromagnetic valve is provided above the non-condensable gas primary storage unit, and above the non-condensable gas secondary storage unit is provided. Therefore, when the solenoid valve is opened, the non-condensable gas in the non-condensable gas primary storage moves to the non-condensable gas secondary storage and is stored in the non-condensable gas secondary storage. Thus, according to the first aspect of the present invention, the non-condensable gas once stored in the non-condensable gas secondary storage unit is reliably stored in the non-condensable gas secondary storage unit as long as the solenoid valve is closed. Stored and never leaks.

As a result, by closing the solenoid valve during the heating operation, the absorption liquid enters the non-condensable gas secondary storage unit due to the pressure difference between the evaporative absorption case and the gas storage unit that becomes high during the heating operation. Can be prevented, so that a problem that the non-condensable gas in the non-condensable gas storage unit flows back into the evaporation absorption case does not occur. Therefore,
In order to prevent the absorption liquid from flowing into the non-condensable gas secondary storage unit and backflow of the non-condensable gas from the non-condensable gas secondary storage unit during the heating operation, the evaporative absorption case and the non-condensable gas storage tank Since it is not necessary to increase the height difference of the air conditioner, the size of the absorption air conditioner can be reduced.

[0013]

Further, in the first aspect, the electromagnetic valve is opened when the inside of the evaporative absorption case becomes a predetermined low pressure state after the cooling operation is started. In the early stage of the cooling operation, the pressure in the evaporative absorption case may not be sufficiently reduced.In such a case, if the solenoid valve is opened, the pressure from the non-condensable gas secondary storage unit is reduced. The non-condensable gas may flow backward. Therefore, during that time, the solenoid valve is closed, and after the pressure drops to a predetermined low pressure, the solenoid valve is opened. Thereby, backflow of the non-condensable gas from the non-condensable gas secondary storage unit can be reliably prevented.

According to a second aspect of the present invention, in the first aspect, the electromagnetic valve is controlled to open and close at a predetermined cycle when the absorption cycle is operated in the cooling operation. During cooling operation, non-condensable gas is not always generated in a large amount, but only in small amounts.Therefore, during operation, the valve is mainly closed and the non-condensable gas is temporarily stored in the middle. If the solenoid valve is continuously opened for a period of time to ensure that the non-condensable gas in the section moves to the non-condensable gas secondary storage section, it should be closed again. Good. As described above, when a solenoid valve that is opened when energized by controlling the opening and closing of the solenoid valve is used, the energization time can be reduced and power consumption can be saved. In addition, since heat is generated in the coil of the solenoid valve with energization, if the energization time is long, crystallization of the absorbing solution may occur. By shortening, crystallization can be prevented.

[0016]

[0017] Claim 3 is based on Claims 1 and 2.
The technical means is that the electromagnetic valve is opened for a predetermined time when the temperature of the absorbing liquid drops below a predetermined temperature after the end of the heating operation. Since non-condensable gas is also generated during the heating operation, the non-condensable gas is stored in the non-condensable gas primary storage unit. After the heating operation is completed, the temperature of the absorbing solution is sufficiently reduced to store the non-condensable gas in the non-condensable gas secondary storage unit, and the pressure in the evaporation absorption case is sufficiently reduced. Open the solenoid valve only for a while. As a result, when the solenoid valve is opened, the pressure in the evaporative absorption case has been sufficiently reduced, and the infiltration of the absorbent and the backflow of the non-condensable gas do not occur due to this pressure difference. The non-condensable gas in the gas primary storage is moved to and stored in the non-condensable gas secondary storage. In addition, during the heating operation, the absorbing liquid leaking from the solenoid valve and entering the non-condensable gas secondary storage unit is returned to the evaporative absorption case when the valve is opened.

According to a fourth aspect of the present invention, as set forth in the first aspect, the electromagnetic valve is normally closed during the cooling operation, and is opened for a predetermined time after the cooling operation is completed. Thereby, the non-condensable gas generated during the cooling operation is stored in the non-condensable gas primary storage unit, and after the cooling operation is completed, the non-condensable gas is kept open for a predetermined period of time. It can be moved to a gas secondary storage.

[0019]

FIG. 1 shows a first embodiment of an absorption type air conditioner according to the present invention. The absorption-type air conditioner is an outdoor unit 100
The outdoor unit 100 includes a refrigerator main body 101 and a cooling tower (cooling tower) CT. The air conditioner is controlled by the control device 102.

The refrigerator main body 101 is mainly formed of stainless steel, and forms an absorption cycle of a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid. A high-temperature regenerator provided with a gas burner B as a heating source below. 1 and a low-effect regenerator 2 arranged so as to cover the outside of the high-temperature regenerator 1, and an absorption element double arranged toward the outer periphery of the low-temperature regenerator 2. The condenser 3 and the evaporator 4 are connected to the condenser 5 disposed above the absorber 3 and the evaporator 4 on the outer periphery of the low-temperature regenerator 2 through several passages. Note that the absorbing solution contains an inhibitor for suppressing corrosion due to the reaction between stainless steel and lithium bromide.

The high-temperature regenerator 1 is provided above the heating tank 11 heated by the gas burner B with the 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.

On the lower side inside the medium-concentration absorbing liquid separation cylinder 12,
An absorbent partitioning vessel 13 arranged at a distance from the inner wall of the medium-concentration absorbent separation tube 12 is provided with several upper edge portions joined to the inside of the medium-concentration absorbent separation tube 12,
Between the medium-concentration absorbing liquid separating cylinder 12 and the absorbing liquid partitioning vessel 13, an absorbing liquid rising flow path 14 in which the absorbing liquid heated in the heating tank 11 rises is formed.

Absorbent liquid return plate 15 for returning the intermediate-concentration absorbent rising in absorption-liquid ascending channel 14 is provided in medium-concentration absorbent separation cylinder 12 above absorbent-liquid partitioning vessel 13. The above-described medium-concentration absorbent separating cylinder 12 is composed of two members, an upper member located above the absorbent returning plate 15 and a lower member located below the absorbing liquid returning plate 15. On the other hand, they are joined by welding.

At the side of the absorption liquid partitioning vessel 13, the medium-concentration absorption liquid from which the refrigerant has been separated and made highly concentrated is supplied to the low-temperature regenerator 2.
An inlet of the medium-concentration absorbent flow path L1 for supplying to the evaporator 4 is provided at the bottom of the absorbent-liquid partition container 13 for supplying the heated absorbent to the evaporator 4 during the heating operation. The inlet of the heating absorbent flow path L4 is open.

Inside the lower part of the refrigerant recovery tank 10, a refrigerant partitioning tube 17 for forming a heat insulating gap 17 a between itself and the middle concentration absorbing liquid separation tube 12 is provided.
Is joined to. Thereby, the medium concentration absorbing liquid separating cylinder 1
2, the heat in the refrigerant circuit tank 10 is cut off.
The high-temperature absorbent in the absorbent rising channel 14 is not heated. The inside of the refrigerant recovery tank 10 outside the refrigerant partition tube 17 is a refrigerant storage part 10a for storing the separated refrigerant, and the refrigerant storage part 10a has an inlet of a refrigerant flow path L5 communicating with the condenser 5. It is open.

With the above-described configuration, in the high-temperature regenerator 1, the low-concentration absorbent stored in the heating tank 11 is heated by the gas burner B to evaporate water in the low-concentration absorbent, thereby forming refrigerant vapor (steam). ) As the medium-concentration absorption liquid separation cylinder 12
And the medium-concentration absorbent concentrated by evaporation of the refrigerant vapor is returned to the absorption liquid partitioning vessel 13 inside the medium-concentration liquid separation cylinder 12, and the low-temperature regenerator 2 is supplied through the medium-concentration absorption liquid flow path L1. Supply to Further, the separated refrigerant vapor is recovered in the refrigerant recovery tank 10, and the refrigerant vapor is passed through the refrigerant flow path L5.
Supply to

The low-temperature regenerator 2 is a vertical cylindrical low-temperature regenerator case 2 installed eccentrically 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 inside of the absorption liquid partitioning vessel 13 in the medium concentration absorption liquid separation tube 12 via the heat exchanger H by the medium concentration absorption liquid flow path L1.

An orifice (not shown) for restricting the flow rate of the medium-concentration absorbing liquid flowing from the absorbing liquid partitioning vessel 13 to the low-temperature regenerator 2 is provided in the medium-concentration absorbing liquid passage L1. The medium-concentration absorbing liquid is supplied into the container case 20 by a pressure difference from the medium-concentration absorbing liquid separating cylinder 12.
(Approximately 70 mmHg in the low-temperature regenerator case 20 and approximately 700 mmHg in the medium-concentration absorbent separation tube 12)

Thus, the low-temperature regenerator 2 reheats the medium-concentration absorbent supplied into the low-temperature regenerator case 20 by using the outer wall of the refrigerant recovery tank 10 as a heat source, and the medium-concentration absorbent is supplied to the low-temperature regenerator case. The refrigerant vapor and the high-concentration absorbent are separated by the gas-liquid separation section 22 above the high-absorption liquid 20, and the high-concentration absorbent is stored in the high-concentration absorbent reception section 23. At the bottom of the high-concentration absorbent receiving section 23, an inlet of a high-concentration absorbent flow path L2 communicating with the absorber 3 is opened.

On the outer periphery of the low-temperature regenerator case 20, a vertical cylindrical air-tight evaporating / absorbing case 30 is concentrically disposed at a lower portion, and a condenser case 50 is concentrically disposed at an upper portion. , The low-temperature regenerator case 20 and the evaporating / absorbing case 30 are integrally welded to the bottom plate 18, and the inner end of the bottom plate 18 is welded to the outer peripheral surface of the lower member of the middle-concentration absorbent separation cylinder 12. , The refrigerator main body 101 is formed. The low-temperature regenerator case 20 is connected to the refrigerant vapor outlet 2
1 and the inside of the condenser case 50 via the gap 5A.

The absorber 3 is provided with an absorption coil 31 which is wound in a vertical cylindrical shape inside an inner portion inside the evaporation / absorption case 30 and through which cooling water for exhaust heat flows. 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 flow passage L2 connected to the high-concentration absorbent receiver 23 of the low-temperature regenerator 2 through the heat exchanger H. The concentration absorbing liquid is received and sprayed, and the cooling water for exhaust heat cooled by the cooling tower CT circulates in the absorbing coil 31 during the cooling operation.

In the absorber 3, the high-concentration absorbing liquid flows in from the high-concentration absorbing liquid flow path L 2 due to the pressure difference, and the high-concentration absorbing liquid that flows in is absorbed by the high-concentration absorbing liquid spraying device 32 by the absorbing 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 water vapor absorbed by the absorbing liquid is generated as refrigerant vapor in the evaporator 4 described later.

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 via the heat exchanger H.

An ejector 80 is provided inside the absorber 3 as a bleeding device for sucking non-condensable gas (hydrogen gas) generated in the absorption cycle. The ejector 80 is provided with a suction conduit 82 having a smaller diameter than the suction port 81 on an extension of the suction port 81 opened in the absorber 3, and an absorbing liquid communicating with the discharge side of the absorbing liquid pump P <b> 1 inside the suction port 81. Discharge pipe 83 is arranged, and absorption liquid pump P
When the absorbing liquid is discharged toward the suction port 81 from the end of the absorbing liquid discharge pipe 83 by the discharge pressure of 1, the refrigerant vapor and non-condensable gas and the like between the suction port 81 are removed by the so-called ejector effect. The structure is such that it is sucked into the absorbing liquid and mixed.

The suction conduit 8 extended from the ejector 80
Reference numeral 2 denotes a gas-liquid separation tube 8 formed of a substantially J-shaped (or substantially U-shaped) valley 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 upward at the position after 5.

The non-condensable gas storage 90 is connected to the end of the gas-liquid separation tube 84 which is the end of the gas-liquid separator.
The non-condensable gas storage 90 includes a sub-tank portion 91 integrally formed on the extension of the gas-liquid separation tube 84 via the valley portion 85,
A gas storage valve 92 as an electromagnetic valve is provided at the upper end of the sub tank 91.
And has a composite tank structure with a main tank section 93 provided in communication with the main tank section 93.

With the above configuration, the ejector 80 and the non-condensable gas storage 90 are configured so that the absorbing liquid discharged from the absorbing liquid discharge pipe 83 of the ejector 80 toward the suction port 81 during the operation of the absorbing liquid pump P1. , The vapor refrigerant and the non-condensable gas in the absorber 3 are sucked from the suction port 81 of the ejector 80, and the suction conduit 82
When the inside is mixed with the absorbing liquid, the mixture is guided to the gas-liquid separating pipe 84, and the non-condensable gas is separated from the absorbing liquid in the gas-liquid separating pipe 84, and when the gas storage valve 92 is closed, the sub-tank is closed. Store in section 91. When the gas storage valve 92 is open, the non-condensable gas in the sub tank 91 is
The gas moves through the gas storage valve 92 into the main tank 93 and is stored. The sucked vapor refrigerant is supplied to the suction conduit 82
In the inside, only the non-condensable gas is separated from the gas-liquid separation pipe 84 as a gas.

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 43 of the evaporator 4 communicates with the absorbent partitioning vessel 13 inside the medium-concentration absorbent separation cylinder 12 by a heating absorbent flow path L4 having a cooling / heating switching valve 6 composed of an electromagnetic valve.

In the evaporator 4, when the refrigerant liquid is dropped onto 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
Is an orifice (not shown) for restricting the refrigerant flow rate
Is connected to the refrigerant storage portion 10a of the refrigerant recovery tank 10 by the refrigerant flow path L5 provided with the refrigerant vapor outlet 2
1 and the low-temperature regenerator 2 through the gap 5A, each of which has a pressure difference (about 70 mmH in the condenser case).
g) supplies the refrigerant.

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 and to the refrigerant liquid dispersing tool 42 via the refrigerant cooler 52.

With the above structure, the absorbing liquid is supplied from the high-temperature regenerator 1 → the medium-concentration absorbing liquid passage L1 → the low-temperature regenerator 2 → the high-concentration absorbing liquid passage L2 → the absorber 3 → the absorbing liquid pump P1 → the low-concentration absorbing liquid. The liquid circulates in the order of the liquid flow path L3 and 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 L3 → high temperature regenerator Circulate in the order of 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 absorbing 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 air from the blower S promotes the evaporation of water.

The evaporator coil 41 of the evaporator 4 includes an indoor unit R
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.
A blower 46 is provided to allow room air to pass through and blow out the room 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, and the absorbing liquid pump P
Activate 1

As a result, the high-temperature medium-concentration absorbing liquid in the medium-concentration absorbing liquid separation cylinder 12 flows into the evaporator 4 from the bottom 43 of the evaporator 4, and the cold and 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. The medium-concentration absorbent in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, and is returned to the heating tank 11 by the absorbent pump P1 via the low-concentration absorbent flow path L3.

Next, control of the gas storage valve 92 provided between the ejector 80 in the absorber 3 and the non-condensable gas storage 90 in the outdoor unit 100 having the above configuration by the control device 102 will be described. I do. First, the cooling operation will be described with reference to FIG. When an instruction to start the cooling operation is issued (YE in step 10).
S), the gas burner B is ignited, and the driving of the absorbent pump P1 and the cold / hot water pump P3 is started (step 11).

In the high-temperature regenerator 1, the absorbing liquid in the heating tank 11 is heated, and the absorbing liquid and the refrigerant start circulating in the absorption cycle. In the initial stage of the operation, the pressure in the evaporation / absorption case 30 is not sufficiently reduced, so that the pressure in the evaporation / absorption case 30 is higher than the pressure in the main tank 93 of the non-condensable gas storage 90. In such a case, if the gas storage valve 92 is opened, the absorbing liquid may be pushed into the main tank 93. Therefore, here, the gas storage valve 92 is still closed.

The temperature of the absorbing solution heated in the heating tank 11 gradually increases, and the temperature of the absorbing solution in the high-temperature regenerator 1 becomes 130
If the temperature of the refrigerant liquid in the evaporator 4 becomes 15 ° C. or less (YES in Step 12), the control of opening and closing the gas storage valve 92 is started (Step 13). At this time, the operation of the absorption cycle is stabilized by the absorption liquid and the refrigerant circulating in the absorption cycle, and the pressure in the absorber 3 is lower than the pressure in the main tank portion 93. Does not enter the main tank 93 even if the valve is opened.

In the absorption cycle, the cold / hot water cooled in the evaporator coil 41 of the evaporator 4 is supplied to the air conditioning heat exchanger 44, and the indoor unit RU cools the room by the blower 46. During this cooling operation, the non-condensable gas generated in the absorption cycle is extracted by the ejector 80,
While the gas storage valve 92 is closed, the gas is stored in the sub tank 91, and when the gas storage valve 92 is opened, the non-condensable gas in the sub tank 91 moves to the main tank 93 and is stored. You.

The opening / closing control of the gas storage valve 92 is such that the gas storage valve 92 is opened for 10 minutes by energization, and the energization is stopped for 50 minutes thereafter, and this operation is repeated during the cooling operation. . Thus, the reason why the energization time of the gas storage valve 92 is limited to a shorter time than the non-energization time is as follows.
This is because, when the gas storage valve 92 is energized for a long time, the absorption liquid near the gas storage valve 92 may crystallize due to heat generated by the energization. In the present embodiment, by setting the energization time to 10 minutes and the energization stop time to 50 minutes, heat generation during energization can be sufficiently suppressed during the stoppage of energization, so that the absorption liquid does not crystallize.

When the stop of the cooling operation is instructed (YES in step 14), the combustion of gas burner B is stopped,
The energization of the gas storage valve 92 is stopped and the valve is closed. Thereafter, in order to prevent crystallization in the absorption cycle, the absorption liquid pump P1 is continuously operated and then stopped (step 15), and the cooling operation is ended for a predetermined time. As described above, during cooling operation, until the inside of the absorption cycle is stabilized,
After the gas storage valve 92 is closed and stabilized, the gas storage valve 92 is opened and closed at regular intervals. Thereby, when the gas storage valve 92 is opened, the non-condensable gas can be trapped in the main tank portion 93, and the crystallization of the absorbing liquid due to the heat generated due to the energization of the gas storage valve 92 can be prevented. Can be.

Next, the heating operation will be described with reference to FIG. In the heating operation, when an instruction to start the heating operation is issued (YES in step 20), predetermined heating operation control is performed (step 21). In the heating operation control, the cooling / heating switching valve 6 is opened, the gas burner B is burned, and the absorbent pump P1 and the cold / hot water pump P3 are driven. During this heating operation, the gas storage valve 92 is normally closed. As a result, the heated absorbing liquid is supplied from the high-temperature regenerator 1 to the evaporator 4, and the cold and hot water circulating in the evaporating coil 41 is heated, and the indoor unit RU heats the room by the air-conditioning heat exchanger 44. . Further, the non-condensable gas generated during the heating operation is stored in the sub tank unit 91.

As described above, during the heating operation, the gas storage valve 9
Since the valve 2 is normally closed, it is possible to prevent the absorbing liquid from entering the main tank 93 due to the pressure difference between the evaporating / absorbing case 30 and the non-condensable gas storage 90 which becomes high pressure during the heating operation. The problem that the non-condensable gas in the main tank 93 flows back into the evaporation / absorption case 30 does not occur. Therefore, in order to prevent the absorption liquid from flowing into the main tank 93 and the backflow of the non-condensable gas from the main tank 93 during the heating operation, evaporation and
Since there is no need to increase the height difference between the absorption case 30 and the main tank portion 93, the size of the absorption air conditioner can be reduced.

When the heating operation is instructed (step 2)
(YES in 2), the above-described heating operation control is completed, the gas burner B is extinguished, and the absorbent pump P1 is continuously operated for a predetermined time and then stopped. After the above heating operation is completed, the temperature of the absorbent in the high-temperature regenerator 1 gradually decreases with the extinguishing of the gas burner B, and when the temperature falls to 30 ° C. or lower (YES in step 23), the evaporation When it is determined that the pressure in the absorption case 30 has been sufficiently reduced, the opening and closing control of the gas storage valve 92 is started (step 24). Here, energization for 10 minutes and stop of energization for 50 minutes are repeated twice. As a result, the non-condensable gas generated during the heating operation can be stored in the main tank 93, and the absorbing liquid that has entered the main tank 93 due to the leakage of the gas storage valve 92 during the heating operation. Can be returned into the absorber 3. The reason why the opening / closing control of the gas storage valve 92 is repeated twice is that the action of returning the absorbing liquid that has entered due to the leak is performed slowly due to the head difference, and it takes 10 minutes or more. In order to prevent crystallization due to heat generation due to the energization of the valve 92, the energization time for 10 minutes is a limit. This is for securing 20 minutes by repeating the process twice.

As described above, according to the present invention, the non-condensable gas generated in the absorption cycle is sucked by the ejector 80 in the absorber 3 and stored in the non-condensable gas storage 90. At this time, the non-condensable gas storage 90
Is sucked by the ejector 80 and the gas-liquid separation tube 8
The non-condensable gas separated by 4 can first be stored in the non-condensable gas primary storage unit 91, and can be moved to the main tank unit 93 and stored when the gas storage valve 92 is opened. In addition, the duration of energization for opening the gas storage valve 92 is limited to 10 minutes, and by stopping energization for 50 minutes, the heat generated during energization can be suppressed to prevent crystallization of the absorbing solution. Can be.

FIG. 4 shows a second embodiment of the present invention. In the above embodiment, the ejector 80 was used as a structure for separating the non-condensable gas generated in the absorption cycle. However, in the second embodiment, a siphon container 800 was used instead of the ejector 80 of the first embodiment. Used. The siphon container 800 allows the non-condensable gas introduction pipe 801 opened at the lower part of the absorber 3 to communicate with the middle part in the siphon container 800, and the lower part in the siphon container 800 has an inverted U-shaped (or inverted J-shaped). An absorbent discharge pipe 802 which is formed of a mountain-shaped tubular body having a shape like a circle) and forms a siphon pipe is provided.

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 to 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.
When the pressure is higher than 03, the absorbent in the siphon container 800 is discharged from the absorbent discharge pipe 802. At this time, the non-condensable gas that has entered the peak portion 803 of the absorbent discharge pipe 802 is pushed out by the discharged absorbent and discharged, and the vapor in the absorber 3 is introduced from the non-condensable gas introduction pipe 801. Inhale refrigerant and non-condensable gas.

The absorption liquid discharge pipe 802 is disposed inside the gas-liquid separation pipe 84 formed of a valley tubular body as in the above embodiment to form a gas-liquid separator. The non-condensable gas mixed in the liquid is stored above by gas-liquid displacement. In this embodiment, the siphon container 800
An auxiliary absorber is formed for absorbing the vapor refrigerant therein into the absorbing liquid.

In the above embodiment, the gas storage valve 92 is controlled to open and close during the cooling operation. However, the valve is normally closed during the cooling operation, and is opened for a predetermined time after the cooling operation is completed. You may.

In each of the above embodiments, the cooling tower CT of the cooling water flow path 34 is of 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 conditioning heat exchanger 44 is provided in the indoor unit RU. However, in order to perform the dehumidifying operation without lowering the indoor temperature, the air once cooled by the air conditioning heat exchanger 44 is used. Air-conditioning heat exchanger 4
4 may be juxtaposed.

In the above embodiment, the solenoid valve is controlled to open and close during the cooling operation. However, the solenoid valve that generates less heat or the valve is held open by a permanent magnet, and the current is supplied only instantaneously during the valve opening and closing operations. If a solenoid valve is used, the valve may be kept open. Further, even if the pressure in the evaporating / absorbing case 30 is at the start of the cooling operation and during the stop, the infiltration of the absorbing liquid into the main tank 93 of the gas storage 90 and the backflow of the non-condensable gas do not occur. If a height difference is provided (for example, 20 cm), the valve may be constantly opened during the cooling operation, or may be opened during the stop. In addition, it is not limited to double utility,
It may be a heavy 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 absorption type air conditioner showing a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining a control operation of a gas storage valve in a cooling operation of the absorption type air conditioner of the present invention.

FIG. 3 is a flowchart for explaining a control operation of a gas storage valve in a heating operation of the absorption type air conditioner of the present invention.

FIG. 4 is a schematic configuration diagram of an absorption type air conditioner showing a second embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 Outdoor unit (absorption air conditioner) 1 High temperature regenerator (regenerator) 2 Low temperature regenerator (regenerator) 3 Absorber 4 Evaporator 5 Condenser 6 Cooling / heating switching valve 80 Ejector (Bleeding unit, non-condensable gas bleeding device) ) 84 gas-liquid separation tube (gas-liquid separation unit, non-condensable gas extraction device) 90 non-condensable gas storage unit (non-condensable gas storage tank) 91 sub-tank unit (non-condensable gas primary storage unit) 92 gas storage valve (Electromagnetic valve) 93 Main tank part (non-condensable gas secondary storage part) P1 Absorbent pump (pump) L4 Heating absorbent flow path (Heating operation absorbent liquid pipe) 800 Siphon container (bleed part, non-condensing) Gas extractor)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toru Fukuchi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (56) References JP-A-62-175566 (JP, A) JP-A-62-175566 Hei 2-247465 (JP, A) JP-A-8-75324 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 43/04

Claims (4)

(57) [Claims] 1. A regenerator that heats an absorbent containing a refrigerant to separate refrigerant vapor from the absorbent, a condenser that cools and condenses the refrigerant vapor separated by the regenerator, An evaporator for evaporating the condensed refrigerant under a low pressure; and an absorber arranged in parallel with the evaporator in an evaporation absorption case, for absorbing the refrigerant vapor evaporated by the evaporator into an absorbent supplied from the regenerator. A pump for returning the absorbent from the absorber to the regenerator; and performing an air-cooling operation by forming an absorption cycle from:
An absorption type air conditioner having a heating / cooling switching valve that is opened during a heating operation and having a heating operation absorption liquid pipe for supplying a high-temperature absorption liquid of the regenerator to the evaporator, A bleeding section for extracting the non-condensable gas in the provided evaporative absorption case and a gas for separating the non-condensable gas extracted by the bleeding section from the absorbent, which is provided in communication with the bottom in the evaporative absorption case. A non-condensable gas bleeding device comprising a liquid separation unit; 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; The non-condensable gas is communicated through an electromagnetic valve provided above the non-condensable gas primary storage unit, is provided above the electromagnetic valve, and is discharged from the non-condensable gas primary storage unit when the electromagnetic valve is opened. Non-condensable gas for storing non-condensable gas And a non-condensable gas storage tank consisting of the secondary reservoir, the solenoid valve after the cooling operation is started, the evaporative absorber
An absorption-type air conditioner , wherein a valve is opened when a predetermined low pressure state occurs in a case . Wherein said solenoid valve, before in the cooling operation
During the operation of the absorption cycle, opening and closing are controlled at predetermined intervals.
Absorption air conditioning apparatus according to claim 1, characterized in Rukoto. 3. The electromagnetic valve, after the end of the heating operation,
When the temperature of the absorbent drops below the specified temperature, the specified time
Absorption air conditioning apparatus according to claim 1 and 2, characterized in that it is between the valve opening. 4. The electromagnetic valve is normally operated during the cooling operation .
The absorption type air conditioner according to claim 1 , wherein the valve is closed for a predetermined time and is opened for a predetermined time after the cooling operation is completed .