JPH06257883A - Absorption type water cooler-heater - Google Patents

Abstract

PURPOSE:To reduce number of using switching valves enhance reliability without fear of introducing a capacity decrease due to leakage of vacuum from the valve, a perforation accident, etc., due to penetration of the air. CONSTITUTION:A bypass tube 19 for bypassing refrigerant vapor generated in a generator 1 through a condenser 2 and bypassing gas-liquid two-phase flow of the refrigerant vapor and absorption solution to a low pressure vessel side is provided between the generator 1 side, an absorber 5 and a low pressure vessel side of an evaporator 4, and a switching valve 20 which is closed at the time of taking chilled water to the tube 19 and opened at the time of taking warm water is interposed therebetween.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller-heater, more specifically, an absorption chiller-heater having a generator, a condenser, an absorber, and an evaporator, from which cold water or hot water is taken out. Regarding

[0002]

2. Description of the Related Art Conventionally, this type of absorption chiller-heater has been disclosed, for example, in "Facility and Management May 1990 Issue 4" issued by Ohmsha.
It is known as described in “Gas absorption chiller / heater system diagram” on page 6. As shown in FIG. 6, this chiller / heater has a high temperature generator A, a low temperature generator B, a condenser C, and an evaporator D.
And an absorber E, and between the refrigerant vapor region of the high temperature generator A and the inner bottom of the condenser C, the refrigerant vapor generated in the high temperature generator A is passed through the low temperature generator B to the condenser. A refrigerant vapor pipe F for sending to the C side is connected, and a high temperature heat exchanger G is provided in the middle between the refrigerant solution region of the high temperature generator A and the upper inner side of the low temperature generator B. High temperature generator A
Is connected to an intermediate solution pipe H for sending the refrigerant solution to the low temperature generator B side, and between the inner bottom portion of the low temperature generator B and the upper inner side of the absorber E, an intermediate low temperature heat exchanger is provided. A concentrated solution pipe J having I and supplying a concentrated solution stored in the inner bottom portion of the low temperature generator B to the upper side of the absorber E is connected.

Between the inner bottom of the condenser C and the evaporator D, a refrigerant liquid pipe K for sending the refrigerant liquid stored in the inner bottom of the condenser C to the evaporator D is connected. Between the lower side and the upper side of the evaporator D, a refrigerant liquid pipe M in which a refrigerant pump L is interposed is connected, while at the inner bottom of the absorber E, an absorption liquid pump is provided in the middle. A dilute solution pipe O having N and passing through the high and low heat exchangers G and I to the upper side of the high temperature generator A is connected.

Further, a refrigerant vapor branch pipe P that branches from the middle of the refrigerant vapor pipe F and extends to the upper side of the absorber E.
Is provided in the middle of the refrigerant vapor branch pipe P to intervene the first solenoid valve Q which is opened at the time of taking out hot water and closed at the time of taking out cold water.
A solution branch pipe R extending to the upper side of the solution branch pipe is provided, and in the middle of this solution branch pipe R, open when hot water is taken out and closed when cold water is taken out
While interposing the solenoid valve S, a first connecting pipe T is connected between the inner bottom portion of the evaporator D and the inner bottom portion of the absorber E, and hot water is taken out in the middle of the first connecting pipe T. A third solenoid valve U that opens and closes when cold water is taken out is interposed. Further, a second connecting pipe V is provided between the inner bottom portion of the evaporator D and the middle of the dilute solution pipe O, and a fourth connecting pipe V is provided in the middle of the second connecting pipe V.
The solenoid valve W is interposed.

A cooling water pipe X is provided from the outside of the absorber E to the outside through the absorber E and the condenser C, and the evaporator D is provided with a cold / hot water take-out pipe. Y
The cold and hot water taken out from the take-out pipe Y is used as a cooling and heating source for a room or the like. In the figure, Z is a refrigerant blowing valve provided between the solution pipe M and the inner bottom of the evaporator D.

When performing the cooling operation using the above absorption-type chiller-heater, the first to fourth solenoid valves Q, S, U and W are closed. And first, the high temperature generator A
A high-temperature refrigerant vapor is generated by igniting a burner a provided inside and heating a dilute solution such as a lithium bromide solution loaded therein, and this refrigerant vapor passes through the refrigerant vapor pipe F. The refrigerant is sent to the low-temperature generator B, and in the low-temperature generator B, the medium-concentration solution introduced from the high-temperature generator A through the high-temperature heat exchanger G into the low-temperature generator B is heat-exchanged with the refrigerant. Steam is generated, the refrigerant vapor is sent to the condenser C to be condensed and liquefied, and the condensed liquid refrigerant is condensed from the refrigerant vapor pipe F when passing through the low temperature generator B together with the refrigerant refrigerant pipe. K to the evaporator D
Water supplied to the upper side of the evaporator D by the refrigerant liquid pipe M having the refrigerant pump L from the lower side of the evaporator D to cool the water passing through the take-out pipe Y. And used as a cooling source. Further, in the low temperature generator B, the refrigerant solution of the high temperature generator A introduced via the intermediate solution pipe H is heat-concentrated by heat exchange with the vapor refrigerant in the refrigerant vapor pipe F.

Further, the refrigerant vapor that has been heat-exchanged with the water in the take-out pipe Y in the evaporator D and evaporated is the absorber E.
On the other hand, since the concentrated solution heated and concentrated in the low temperature generator B is supplied to the inner upper portion of the absorber E through the concentrated solution pipe J having the low temperature heat exchanger I in the middle. Therefore, the refrigerant vapor flowing into the absorber E is absorbed by the concentrated solution, and the concentrated solution becomes a dilute solution by absorbing the refrigerant vapor. It is returned to the high temperature generator A through the high and low heat exchangers G and I by a dilute solution pipe O equipped with N.

When performing the heating operation by using the above absorption-type chiller-heater, the first to fourth solenoid valves Q, S,
The operation is performed by opening U and W respectively and stopping the water flow to the cooling water pipe X. Then, first, a high-temperature refrigerant vapor is generated by igniting the burner a provided in the high-temperature generator A and heating the dilute solution inside thereof, and most of this refrigerant vapor is generated by the first solenoid valve. When Q is opened, it is supplied from the refrigerant vapor branch pipe P to the absorber E via the first electromagnetic valve Q and is sent from the absorber E to the evaporator D side, where the evaporator D is condensed. As a container, heat exchange is performed with the refrigerant vapor and water passing through the extraction pipe Y, and the water is heated and used as a heating source.

The refrigerant condensed in the evaporator D has the first solenoid valve U opened, so that the first refrigerant
It is supplied from the connecting pipe T to the inner bottom of the absorber E, while inside the absorber E, the high temperature generator A is passed through the solution branch pipe R by opening the second solenoid valve S. Is supplied with the intermediate solution, the refrigerant sent from the evaporator D is absorbed into the intermediate solution to become a dilute solution, and the dilute solution is passed from the dilute solution pipe O through the absorption liquid pump N to a high temperature generator. Returned to A. Further, a part of the condensate in the evaporator D is returned from the second connecting pipe V to the dilute solution pipe O via the fourth solenoid valve W and absorbed by the solution flowing in the dilute solution pipe O. It is returned to the high temperature generator A.

[0010]

However, in the absorption chiller-heater as described above, it is necessary to provide four solenoid valves for switching operation during the heating / cooling operation, which causes a large amount of vacuum leakage from these solenoid valves. There is a problem that the capacity may be reduced due to vacuum leakage, and that air leakage due to vacuum leakage may cause holes in the piping due to corrosion, and that the operation during switching between cooling and heating is proportional to the number of solenoid valves. There was a problem that it deteriorated. The vacuum leak will be described in more detail. The inside of each device in the absorption chiller-heater is kept in a substantially vacuum state (for example, absolute pressure 6 mmHg), while the solenoid valve is made airtight. However, it is not perfect, and therefore atmospheric pressure air will invade from the solenoid valve, and if atmospheric pressure air invades, the internal pressure of the equipment will rise and the capacity will be reduced, In addition, when the air enters, the corrosion of the equipment piping due to the absorbing solution is promoted, which causes perforation.

The object of the present invention is to reduce the number of on-off valves used, to reduce the deterioration of reliability due to vacuum leaks and to the reduction of reliability due to hole punching accidents due to corrosion, and to improve the reliability of switching between cooling and heating. It is to provide an absorption chiller-heater.

[0012]

To achieve the above object, the present invention comprises a generator 1, a condenser 2, an absorber 5 and an evaporator 4, from which cold water or hot water is drawn. In the absorption chiller-heater described above, the refrigerant vapor generated in the generator 1 bypasses the condenser 2 between the generator 1 side and the low-pressure container side of the absorber 5 and the evaporator 4, and A bypass pipe 19 that bypasses the low-pressure container by a gas-liquid two-phase flow of a refrigerant vapor and an absorbing solution is provided, and an on-off valve 20 that is closed when cold water is taken out and is opened when hot water is taken out is interposed in the bypass pipe 19. .

The bypass pipe 19 is located at the liquid level position of the absorbing solution in the generator 1 and at the position where the passage opening portion is open to the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the generator 1. It is preferable to connect.

The bypass pipe 19 has one end connected to the generator 1, and the connecting portion 19a is projected from the liquid region of the absorbing solution in the generator 1,
While opening the rush tip into the gas area of the refrigerant vapor,
A solution inlet 1 that opens into the liquid region at the entry into the liquid region
9c may be provided.

Further, one end of the bypass pipe 19 is connected to the liquid portion on the side of the generator 1, and a steam ejector is provided in the middle of the bypass pipe 19 and on the generator side with respect to the on-off valve 20. 26 may be interposed, and a branch steam pipe 71 branched from the refrigerant steam pipe 7 extending from the generator 1 to the condenser 2 may be connected to the steam ejector 26.

A liquid ejector 28 is provided in the middle of the bypass pipe 19, and a refrigerant liquid pipe 27 is connected to the liquid portion of the evaporator 4, and the refrigerant liquid pipe 27 is connected to the liquid ejector 28. You may do it.

[0017]

The cold water can be taken out from the cold / hot water take-out pipe as usual by closing the on-off valve 20 of the bypass pipe 19 during the cold water take-out operation, and the open-close valve 20 of the bypass pipe 19 can be taken during the hot water take-out operation. By opening, the gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution generated in the generator 1 is passed from the bypass pipe 19 to the low pressure container side of the absorber 5 and the evaporator 4 via the opening / closing valve 20. And the refrigerant vapor in the gas-liquid two-phase flow heats the water in the take-out pipe in the evaporator 4 serving as a condenser during the heating operation,
The heated hot water can be taken out.

As described above, the condenser 2 is bypassed by the gas-liquid two-phase liquid between the generator 1 side and the low pressure vessel side of the absorber 5 and the evaporator 4 to the low pressure vessel side. Since the bypass pipe 19 for bypassing is provided, two systems of the refrigerant vapor branch pipe P branching from the refrigerant vapor pipe F and the solution branch pipe R branching from the intermediate solution pipe H are separately provided as in the conventional example. Compared with the above, one bypass pipe 19 can be provided, and two on-off valves interposed in each branch pipe P, R can be provided as one. Therefore, it is possible to reduce the number of on-off valves that cause vacuum leakage, and it is possible to reduce the performance reduction due to vacuum leakage.
In addition, the problem of corrosion caused by the invasion of air due to vacuum leakage can be reduced, the reliability thereof can be improved, and the operability of switching hot and cold water withdrawal can be improved.

Further, the bypass pipe 19 is opened at the liquid level position of the absorbing solution in the generator 1 and the passage opening is opened to the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the generator 1. By connecting to the position, the gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution generated in the generator 1 can be sent to the low-pressure container side with a simple structure, and therefore the piping structure as a whole is It is reasonably easy, and cost reduction can be effectively achieved.

Further, one end side of the bypass pipe 19 is connected to the generator 1, and the connecting portion 19a is made to protrude from the liquid region of the absorbing solution in the generator 1 so that the protruding tip portion of the refrigerant vapor A solution inlet 19c that opens to the liquid region while being opened to the gas region at the protrusion to the liquid region
By providing the above, a predetermined distance can be secured between the intake 19c and the tip side of the connecting portion 19a facing the gas region, and even if the liquid level of the generator 1 slightly fluctuates,
During the hot water extraction operation, the gas-liquid two-phase flow is applied to the bypass pipe 19
Can be reliably sent to the low-pressure container side via.

Further, one end of the bypass pipe 19 is connected to the liquid portion on the side of the generator 1, and the bypass pipe 1 is connected.
A steam ejector 26 is provided in the middle of 9 and on the side of the generator 1 with respect to the on-off valve 20.
By connecting a branch steam pipe 71 branching from the refrigerant steam pipe 7 extending from the generator 1 to the condenser 2 to the internal pressure difference between the generator 1 and the low-pressure container when the on-off valve 20 is opened. By utilizing the ejector action of the vapor ejector 26, the vapor refrigerant from the branch vapor pipe 71 and the refrigerant solution from the bypass pipe 19 can be mixed to form a gas-liquid two-phase flow. Even if there is a change in the liquid level height at 1, the gas-liquid two-phase flow can be reliably sent to the low-pressure container side via the bypass pipe 19.

Further, a liquid ejector 28 is provided in the middle of the bypass pipe 19, a refrigerant liquid pipe 27 is connected to the liquid portion of the evaporator 4, and the refrigerant liquid pipe 27 is connected to the liquid ejector 28. In the case of heating, the refrigerant liquid in the evaporator 4 is sucked through the refrigerant liquid pipe 27 by the ejector action of the liquid ejector 28 during the heating operation, and the refrigerant liquid is discharged into the gas-liquid 2 from the bypass pipe 19. It is possible to mix with the phase flow and reliably send it to the low-pressure vessel side, therefore,
The first having the third solenoid valve U as in the conventional example shown in FIG.
The connecting pipe T and the second connecting pipe V having the fourth solenoid valve W can be omitted, and the number of solenoid valves (open / close valves) can be further reduced,
Vacuum leakage from the solenoid valve can be further reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a double-effect type absorption chiller-heater. This absorption chiller-heater has a high-temperature generator 1A having a burner 1a as a generator 1 and a low-temperature generator 1A. Generator 1
B and the low temperature generator 1B and the condenser 2 are provided in one body 3 having a partition wall 31, and an evaporator 4 having a spattering body 41 on the inner upper side, and an inner upper portion as well. An absorber 5 having a spray body 51 on its side is incorporated in one body 6, and an eliminator 61 is provided inside the body 6 between the evaporator 4 and the absorber 5.

Between the refrigerant vapor region above the high temperature generator 1A and the inner bottom portion of the condenser 2, the refrigerant vapor generated by the high temperature generator 1A passes through the low temperature generator 1B and then the condenser. A refrigerant vapor pipe 7 for sending to the second side is provided, and a high temperature heat exchanger 8 is provided in the middle between the absorbing solution region of the high temperature generator 1A and the upper inner side of the low temperature generator 1B.
An intermediate solution pipe 9 for sending the absorbing solution in the high-temperature generator 1A to the low-temperature generator 1B is provided, and an inner bottom side of the low-temperature generator 1B and an upper inner side of the spray body 51 provided in the absorber 5 are provided. And a low temperature heat exchanger 10 in the middle, and a concentrated solution pipe 11 for supplying the concentrated solution stored in the inner bottom portion of the low temperature generator 1B to the upper side of the absorber 5 is provided. Further, between the inner bottom portion of the condenser 2 and the evaporator 4, there is provided a refrigerant liquid pipe 12 for feeding the refrigerant liquid stored in the inner bottom portion of the condenser 2 into the evaporator 4, and A refrigerant liquid pipe 14 having a refrigerant pump 13 interposed is connected between the inner bottom portion of the evaporator 4 and the spraying body 41, and the absorber 5
A solution pump 15 is provided in the middle of the inner bottom of the
A dilute solution pipe 16 is provided which passes through the low heat exchangers 8 and 10 and reaches the high temperature generator 1A.

Further, a cooling water pipe 17 extending from the outside of the absorber 5 to the outside through the inside of the absorber 5 and the condenser 2 is provided, and a cold / hot water take-out pipe is provided inside the evaporator 4. A pipe 18 is provided so that cold water or hot water taken out from the take-out pipe 18 can be used as a heating and cooling source for a room or the like.

In the structure shown in FIG. 1, however, the refrigerant vapor generated in the high temperature generator 1A is located between the high temperature generator 1A and the absorber 5, and the low temperature generator 1B and the condenser 2 are connected to each other. A bypass pipe 19 for bypassing the refrigerant vapor and the absorbing solution in the high temperature generator 1A to the absorber 5 on the low pressure side as a gas-liquid two-phase flow is provided, and cold water is taken out to the bypass pipe 19. The on-off valve 20 mainly made up of an electromagnetic valve which is sometimes closed when hot water is taken out is interposed.

Further, in the embodiment shown in FIG. 1, the liquid level position of the absorbing solution in the high temperature generator 1A extends over the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the high temperature generator 1A. The one end side of the bypass pipe 19 is connected to the side portion of the liquid level detector 21 provided at a certain position to take out the gas-liquid two-phase flow.

Further, the liquid level detector 21 is provided with a plurality of solution detection sensors 22 composed of electrode rods, and the heating amount by the burner 1a in the high temperature generator 1A is controlled based on the detection result of the sensors 22. Thus, the liquid level of the absorbing solution in the high temperature generator 1A is adjusted to a predetermined height, and the bypass pipe 19 is connected to the liquid level height position to be adjusted in the high temperature generator 1A. The gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution can be effectively taken out.

Further, in the embodiment shown in FIG. 1, a communication pipe 23 is provided between the inner bottom of the evaporator 4 and the inner bottom of the absorber 5, and the communication pipe 23 is opened in the middle of the communication pipe 23 when hot water is taken out. An on-off valve 24 that closes when cold water is taken out is interposed.

Next, the operation of the above configuration will be described. First, when performing the cooling operation using the above absorption-type chiller-heater, the on-off valve 2 installed in the bypass pipe 19 is used.
0 and the switching valve 23 installed in the communication pipe 22 are closed to operate, and a burner 1a in the high temperature generator 1A heats a dilute solution such as a lithium bromide solution to obtain a high temperature refrigerant vapor. This refrigerant vapor is sent to the low temperature generator 1B through the refrigerant vapor pipe 7, and the low temperature is generated from the high temperature generator 1A through the intermediate solution pipe 9 having the high temperature heat exchanger 8. Heat is exchanged with the intermediate concentration solution introduced into the generator 1B, and due to this heat exchange, a part of the refrigerant vapor is condensed and liquefied, and at the same time refrigerant vapor is generated from the intermediate concentration solution to become a concentrated solution. Is the concentrated solution tube 1
1 is sent to the low temperature heat exchanger 10, cooled by the low temperature heat exchanger 10 and sent to the inner upper side of the absorber 5.

The refrigerant vapor generated from the intermediate concentration solution in the low temperature generator 1B by heat exchange with the refrigerant vapor is generated together with the refrigerant vapor generated in the high temperature generator 1A and sent to the low temperature generator 1B. , Is condensed and liquefied by the cooling water that is sent to the condenser 2 from the upper gap of the partition wall 31 provided in the body 3 and that passes through the cooling pipe 17, and the condensed liquid refrigerant is evaporated through the refrigerant liquid pipe 12. Is sent to the inside of the evaporator 4, is pumped up from the inner bottom portion of the evaporator 4 to the spraying body 41 in the evaporator 4 by the refrigerant liquid pipe 14 provided with the refrigerant pump 13, and is then inwardly downward from the spraying body 41. The water that has been sprayed to and comes into contact with the cold / hot water take-out pipe 18, and the water passing through the take-out pipe 18 is cooled and taken out to the outside as a cooling heat source.

Further, in the evaporator 4, the extraction pipe 18
The refrigerant vapor evaporated by the contact with the refrigerant flows into the absorber 5 via the eliminator 61, and in the absorber 5, the low temperature heat exchanger 10 is inserted in the middle from the low temperature generator 1B. A concentrated solution is supplied through the concentrated solution pipe 11 which holds the concentrated solution from the spray body 51 to the absorber 5
The refrigerant vapor flowing into the absorber 5 is absorbed by the concentrated solution because it is sprayed inward and downward, and the concentrated solution becomes a rare solution by absorbing the refrigerant vapor. Then, it is returned to the high temperature generator 1A through the high and low heat exchangers 8 and 10 by the dilute solution pipe 16 equipped with the solution pump 15.

Next, when performing the heating operation with the above absorption-type chiller-heater, the on-off valve 2 installed in the bypass pipe 19 is used.
0 and the on-off valve 24 interposed in the communication pipe 23 are opened, the refrigerant pump 13 is stopped, and the water flow to the cooling pipe 17 is stopped. Then, the high temperature refrigerant vapor generated by igniting the burner 1a in the high temperature generator 1A and heating the dilute solution therein becomes a gas-liquid two-phase flow together with the absorbing solution in the high temperature generator 1A. From the bypass pipe 19 connected to the liquid level detector 21 to the absorber 5 via the on-off valve 20 opened during heating operation, and from the absorber 5, the refrigerant vapor in the gas-liquid two-phase flow. Is sent to the evaporator 4, and the evaporator 4 serves as a condenser to heat the water in the take-out pipe 18 which is piped therein, and the heated hot water is used as a heating source. .

The refrigerant condensed in the evaporator 4 due to heat exchange with the take-out pipe 18 is released from the communicating pipe 23 connected to the inner bottom of the evaporator 4 during heating operation. It is returned to the inner bottom portion of the absorber 5 via the on-off valve 24, and is absorbed by the absorbing solution in the gas-liquid two-phase flow supplied from the bypass pipe 19 into the absorber 5 to become a dilute solution. The solution pump 15 returns the diluted solution pipe 16 to the high temperature generator 1A.

As described above, the bypass pipe 19 is provided between the high temperature generator 1A and the absorber 5 to bypass the condenser 3 and bypass the absorber 5 with a gas-liquid two-phase flow. The refrigerant vapor generated in the high-temperature generator 1A via the bypass pipe 19 is opened in the pipe 19 through one opening / closing valve 20 which is opened during hot water extraction and closed during cold water extraction. Since a two-phase gas-liquid flow of the suction solution and the suction solution is made to flow into the absorber 5 side so that hot water can be taken out, the refrigerant vapor branch pipe P and the solution branch pipe R as in the conventional example shown in FIG. It is possible to simplify the piping and reduce the number of on-off valves by one compared to the case where the two systems are separately provided.

Therefore, since the number of on-off valves that cause vacuum leakage can be reduced, it is possible to reduce the performance reduction due to vacuum leakage, and also to reduce the problem of corrosion caused by the invasion of air due to vacuum leakage and improve its reliability. At the same time, the operability of switching between hot and cold water extraction can be improved.

When connecting the bypass pipe 19 to the high temperature generator 1A as in the above embodiment,
At the liquid level position of the absorbing solution in the high temperature generator 1A, the bypass is provided on a side portion of the liquid level detector 21 provided across the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the high temperature generator 1A. When the pipe 19 is connected, when the on-off valve 20 is opened with a simple structure, the gas-liquid two-phase flow generated in the high temperature generator 1A via the bypass pipe 19 is surely transferred to the absorber 5 side. Therefore, the structure can be reasonably simplified and the cost can be effectively reduced as a whole.

Further, when connecting the bypass pipe 19 to the high temperature generator 1A, as shown in FIG. 2, the connecting portion 19a of the bypass pipe 19 is connected to the liquid region of the absorbing solution in the high temperature generator 1A. From inside,
The tip portion 19b is formed by bending the entry portion upward.
Is opened in the gas region of the refrigerant vapor in the high temperature generator 1A, and the tip portion 1 is formed at the position where it enters the liquid region.
You may make it form the solution inlet 19c which opens in the said liquid area in the downward position which is separated from 9b by a predetermined distance.

In the case of the above configuration, a predetermined distance is secured between the inlet 19c facing the liquid region in the high temperature generator 1A and the tip end 19b of the connecting portion 19 facing the gas region. Therefore, even if the liquid level of the high temperature generator 1A varies slightly, the gas-liquid two-phase flow in the high temperature generator 1A is passed through the bypass pipe 19 during the hot water extraction operation. It can be reliably sent to the absorber 5 side.

Further, as shown in FIG. 3, the low pressure box 5 communicating with the inside of the absorber 5 is provided outside the absorber 5.
2 is provided, and the bypass pipe 1 is provided in the low pressure box 52.
It is preferable to intervene in the middle of 9 and insert the opening / closing valve 20 at the intervention site. By doing so, vacuum leakage in the on-off valve 20 can be reduced, and in combination with the reduction in the number of use of the on-off valve, the problems of performance reduction and corrosion can be solved more effectively.

In the embodiment shown in FIG. 3, one end of the bypass pipe 19 is connected to the middle of the intermediate solution pipe 9 extending from the high temperature generator 1A, and the bypass pipe 19 is connected.
A steam ejector 26 is provided on the side of the high-temperature generator 1A with respect to the on-off valve 20, and a branch steam pipe 71 branched from the refrigerant steam pipe 7 is connected to the steam ejector 26. A check valve 1 is provided between the steam ejector 26 and the on-off valve 20 in the bypass pipe 19.
9d is interposed, and a refrigerant liquid pipe 27 having a check valve 27a is connected to the liquid portion of the evaporator 4, and the tip end side of the refrigerant liquid pipe 27 is provided with an opening / closing valve 20 in the bypass pipe 19. And the check valve 19d, which constitutes the ejector 28.

In the case of the above structure, the on-off valve 2 is also provided.
When 0 is opened, the vapor refrigerant from the branch vapor pipe 71 and the refrigerant solution from the bypass pipe 19 are mixed by the ejector action of the vapor ejector 26 to form a gas-liquid two-phase flow. Can be reliably sent from the on-off valve 20 to the absorber 5 side via the bypass pipe 19. Further, as shown in FIG. 4, a liquid ejector 28 is provided downstream of the on-off valve 20 in the bypass pipe 19, and a refrigerant liquid pipe 27 extending from the liquid portion of the evaporator 4 is provided.
The tip side of the liquid ejector 28 may be projected into the liquid ejector 28.

By providing the liquid ejector 28 as shown in FIGS. 3 and 4, the ejector action of the liquid ejector 28 based on the pressure difference between the high temperature generator 1A side and the evaporator 4 side causes the refrigerant liquid pipe 27 to operate. Since the refrigerant solution in the evaporator 4 can be sucked from the inside of the evaporator 4, it is possible to omit the configuration in which the opening / closing valve 24 is interposed in the communication pipe 23 as in the embodiment shown in FIG. Can be reduced.

Further, in the above absorption-type chiller-heater, as shown in FIG.
It is preferable to use the extraction device for extracting the air from inside the evaporator 4 and the absorber 5 together. That is, in the bleeding device shown in FIG. 5, one end side of the first to third bleeding pipes 29, 30, 31 is connected to the upper sides of the condenser 2, the evaporator 4 and the absorber 5, respectively, and
The dilute solution branch pipe 37 is branched from the middle of the dilute solution pipe 16 on the discharge side of the solution pump 15,
The suction pipes 40, 41 with the ejector 32 interposed therebetween.
Is connected to the gas-liquid separator 33 via the
The bottom liquid region of the is connected to the absorber 5 via the liquid return pipe 34,
A purge tank 36 is connected to the upper gas region via an air purge pipe 35, while the ejector 32 of the suction pipe 40 is connected.
Is connected to the other end side where the first and second extraction pipes 29, 30 are joined, and the ejector 32 of the suction pipe 41 is connected to the third end.
The other end of the bleed pipe 31 is connected, and in the middle of the branch pipe 37, the hot water return side of the cold / hot water take-out pipe 18 is taken in at the time of taking out hot water, and the absorber inlet side of the cooling water pipe 17 at the time of taking out cold water. A heat exchanger 38 for taking in cooling water and exchanging heat with the dilute solution flowing through the branch pipe 37 is provided.

Although not shown, the heat exchange water inlet 38a of the heat exchanger 38 is connected to the hot water return side of the cold / hot water take-out pipe 18 and the absorber 5 of the cooling water pipe 17 through a switching valve. It is switchably connected to the cooling water inlet side, and the outlet 38b is connected to a hot water outlet side of the cold / hot water take-out pipe 18 and a condenser 2 of the cooling water pipe 17 via a switching valve (not shown). The switch is connected to the outlet side of the switch.

In the case of bleeding with the above construction, the suction pipe 4 is used both when cold water is taken out and when hot water is taken out.
The high-pressure and high-temperature dilute solution flowing through 0, 41 is cooled by cooling water or low-temperature return warm water, and this cooling can lower the vapor pressure of the ejectors 32, 32 interposed in the suction pipes 40, 41. Because it is possible, ejector 32, 32
It is possible to effectively extract the air by the differential pressure between the suction pressure by the suction pipe and the internal pressure in the evaporator 4, the absorber 5 and the condenser 3 which connect the respective extraction pipes 29, 30, 31. It is possible to bleed air from the evaporator 4 which has a low temperature, and it is also possible to bleed air from the absorber 5 which has the lowest pressure when cold water is taken out.

In each of the embodiments shown in the figures, the bypass pipe 19 is connected between the absorber 5 and the high temperature generator 1A, but the bypass pipe 19 is connected to the evaporator 4 side. You may make it connect. Further, as described above, the high temperature generator 1A and the low temperature generator 1 are used as the generator 1.
Although the double effect type using B and B is shown, the present invention can also be applied to the single effect type using only the high temperature generator 1A.

[0048]

As described above, the present invention is provided with the generator 1, the condenser 2, the absorber 5, and the evaporator 4, and the absorption type cold temperature in which cold water or hot water is taken out from the evaporator 4. In the water machine, the generator 1 side, the absorber 5 and the evaporator 4
A bypass pipe 1 for bypassing the refrigerant vapor generated in the generator 1 to the low pressure vessel by bypassing the condenser 2 with a gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution.
9 is provided, and the bypass pipe 19 is provided with an opening / closing valve 20 that is closed when cold water is taken out and opened when hot water is taken out.
As compared with the conventional example shown in FIG. 2 in which two systems of the refrigerant vapor branch pipe P and the solution branch pipe R are separately provided, the piping can be simplified and the number of open / close valves can be reduced by one. Therefore, it is possible to reduce the number of on-off valves that cause vacuum leakage, so that the performance reduction due to vacuum leakage can be reduced, and the problem of corrosion caused by the intrusion of air due to vacuum leakage can be reduced, and the reliability can be improved and the cold temperature can be improved. The operability of switching the water extraction can be improved.

Further, the bypass pipe 19 is opened at the liquid level position of the absorbing solution in the generator 1, and the passage opening portion is opened to the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the generator 1. By connecting to the position, the gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution generated in the generator 1 can be surely sent to the low-pressure container side with a simple structure, and therefore the piping structure as a whole. Can be reasonably simplified,
The cost can be reduced.

Further, one end side of the bypass pipe 19 is connected to the generator 1, and the connecting portion 19a is made to protrude from the liquid region of the absorbing solution in the generator 1 so that the protruding end portion thereof is a refrigerant vapor. A solution inlet 19c that opens to the liquid region while being opened to the gas region at the protrusion to the liquid region
By providing the above, a predetermined distance can be secured between the intake 19c and the tip side of the connecting portion 19a facing the gas region, and even if the liquid level of the generator 1 slightly fluctuates,
During the hot water extraction operation, the gas-liquid two-phase flow is applied to the bypass pipe 19
Can be reliably sent to the low-pressure container side via.

Further, one end of the bypass pipe 19 is connected to the liquid portion on the side of the generator 1, and the bypass pipe 19 is connected.
In the middle of, and a steam ejector 26 is provided on the generator 1 side with respect to the on-off valve 20, and a branch steam pipe is branched from the refrigerant vapor pipe 7 extending from the generator 1 to the condenser 2 in the vapor ejector 26. By connecting 71, the internal pressure difference between the generator 1 and the low-pressure container is utilized when the on-off valve 20 is opened, and the ejector action of the vapor ejector 26 causes the vapor refrigerant from the branch vapor pipe 71 to flow. The gas-liquid two-phase flow can be mixed with the refrigerant solution from the bypass pipe 19 to form a gas-liquid two-phase flow. It can be reliably sent to the low-pressure container side via the bypass pipe 19. Further, by inserting the liquid ejector 28 in the middle of the bypass pipe 19, connecting the refrigerant liquid pipe 27 to the liquid portion of the evaporator 4, and connecting the refrigerant liquid pipe 27 to the liquid ejector 28. , The liquid ejector 28 during heating operation
By the ejector action of, the refrigerant liquid in the evaporator 4 is sucked through the refrigerant liquid pipe 27, and the refrigerant liquid is mixed with the gas-liquid two-phase flow from the bypass pipe 19 to the low pressure container side. Therefore, the first communication pipe T having the third solenoid valve U as in the conventional example shown in FIG.
The second communication pipe V having the fourth solenoid valve W can be omitted, the number of solenoid valves (open / close valves) can be further reduced, and the vacuum leakage from the solenoid valves can be further reduced.

[Brief description of drawings]

FIG. 1 is a piping diagram showing an absorption chiller-heater of the present invention.

FIG. 2 is a piping diagram showing another embodiment.

FIG. 3 is a piping diagram showing another embodiment of the present invention.

FIG. 4 is a piping diagram showing another embodiment of the present invention.

FIG. 5 is a piping diagram showing another embodiment of the present invention.

FIG. 6 is a piping diagram showing a conventional absorption chiller-heater.

[Explanation of symbols]

 1 Generator 2 Condenser 4 Evaporator 5 Absorber 7 Refrigerant Steam Pipe 71 Branch Steam Pipe 19 Bypass Pipe 19a Connection 19c Inlet 20 Open / Close Valve 26 Steam Ejector 27 Refrigerant Liquid Pipe 28 Liquid Ejector

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiji Fujii, 1-1 Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Manufacturing Co., Ltd. (72) Takahisa Takigawa 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries Yodogawa Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. An absorption chiller-heater comprising a generator (1), a condenser (2), an absorber (5), and an evaporator (4), from which cold water or hot water is taken out. , The refrigerant vapor generated in the generator (1) bypasses the condenser (2) between the generator (1) side and the low pressure vessel side of the absorber (5) and the evaporator (4). A bypass pipe (19) for bypassing the low-pressure container by a gas-liquid two-phase flow of the refrigerant vapor and the absorbing solution is provided, and an opening / closing valve (20) which is closed when cold water is taken out and is opened when hot water is taken out (20). ) Is an absorption type chiller-heater. 2. The bypass pipe (19) is located at the liquid level position of the absorbing solution in the generator (1), and the passage opening is in the liquid region of the absorbing solution and the gas region of the refrigerant vapor in the generator (1). The absorption chiller-heater according to claim 1, which is connected to a position opened to and. 3. The bypass pipe (19) is connected to the generator (1) at one end side thereof, and the connecting portion (19a) is projected from the liquid region of the absorbing solution in the generator (1),
While opening the rush tip into the gas area of the refrigerant vapor,
The absorption type chiller-heater according to claim 1, wherein a solution inlet (19c) opening to the liquid region is provided at the entry portion into the liquid region. 4. The bypass pipe (19) is connected to one end of the bypass pipe (19) with a liquid portion of the generator (1), and the bypass pipe (1) is connected.
9) In the middle of 9), a steam ejector (26) is provided on the generator side of the on-off valve (20), and the steam ejector (26) extends from the generator (1) to the condenser (2). The absorption chiller-heater according to claim 1, wherein a branch steam pipe (71) branched from the refrigerant steam pipe (7) is connected. 5. A refrigerant liquid pipe (27) is connected to the liquid portion of the evaporator (4) while a liquid ejector (28) is provided in the middle of the bypass pipe (19). ) Is connected to the liquid ejector (28).