JP2645829B2 - Absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial application field The present invention relates to an absorption refrigerator, an absorption chiller / heater or an absorption heat pump using water as a refrigerant and a salt solution such as lithium bromide as an absorption liquid. (Referred to as a refrigerator).

(B) Conventional technology Conventionally, in an absorption refrigerator of this type, an evaporator or an absorber is connected to a gas phase portion of a container having a pressure higher than that of the container through a pipe having an operation valve, and the evaporator or absorber is connected to a cold water load. It is known that the operation valve can be opened when the refrigerant pump stops and the cooling function of the evaporator can be stopped (for example, see Japanese Utility Model Publication No. 52-49493).

(C) Problems to be Solved by the Invention However, conventionally, in this type of absorption refrigerator, a solenoid valve is generally used as an operation valve, and the solenoid valve can be welded to a pipe for maintenance and inspection. For this reason, there have been problems such as poor durability of the sealing portion between the solenoid valve and the pipe or high price.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides an absorption refrigerator capable of welding with the pipe and stopping a cooling function in an evaporator by using a cheap valve. Subject.

(D) Means for Solving the Problems The present invention provides, as means for solving the above problems, a pipe connecting the refrigerant vapor flow path or the absorption liquid flow path or the condenser to the downstream side of the solution pump; It is provided with a check valve provided and closed when a discharge pressure from the solution pump is applied, and a branch pipe branched from a pipe between the check valve and the solution pump to reach the absorber.

(E) Function In the absorption refrigerator of the present invention, a pipe connecting the refrigerant vapor flow path or the absorption liquid flow path or the condenser with the downstream side of the solution pump, and the discharge pressure from the solution pump provided in this pipe is set. The structure includes a check valve that closes when it is added, and a branch pipe that branches from a pipe between the check valve and the solution pump to reach the absorber. Therefore, during operation of the solution pump, the check valve is closed by the discharge pressure of the solution pump. Further, when the solution pump is stopped, the check valve is opened, and the refrigerant from the refrigerant vapor flow path or the absorption liquid flow path or the condenser connected to the pipe is supplied to the absorber via the pipe and the branch pipe. Flows into

(F) Example Hereinafter, an example of an absorption refrigerator of the present invention will be described with reference to the drawings. The absorption refrigerator shown in FIGS. 1 and 2 is one embodiment of the present invention, and will be described first with reference to FIG.

(1) is a heat exchanger for transferring heat between the vapor and the absorbing liquid,
(2) is a high-temperature regenerator that heats and separates a refrigerant using heat from the heat exchanger (1), (3) is a low-temperature regenerator, (4) is a condenser, (5) is an evaporator, and ( 6) is an absorber, and (7) and (8) are low and high temperature heat exchangers. (9) is a refrigerant pipe, and (10) is a refrigerant liquid recirculation pipe having a refrigerant pump (11) and sending the refrigerant liquid to the evaporator (5) again. (12) is a diluent pipe which has a solution pump (13) and sends the solution to the high-temperature regenerating rare (2), and (14) is a low-temperature pipe via the high-temperature heat exchanger (8) from the high-temperature regenerator (2). An intermediate liquid pipe for guiding the intermediate liquid to the regenerator (3), and a concentrated liquid pipe (15) for guiding the concentrated liquid from the low temperature regenerator (3) to the absorber (6) via the low temperature heat exchanger (7). is there. (16) is a refrigerant conduit for guiding the refrigerant from the high temperature regenerator (2) to the condenser (4) via the low temperature regenerator (3). (17) is a cold water pipe as a cold water flow path, and (18) is a cooling water pipe as a cooling water flow path.

(19) is a steam control valve, and (20) is a steam trap.

(21) is a pipe connecting the refrigerant conduit (16) and the diluent pipe (12) downstream of the solution pump (13), and the pipe (21) is a check valve (23)
And a branch pipe (24). The branch pipe (24) is connected to the absorber (6), and the check valve (23) is connected to the branch pipe (2).
4) The pipe (2) closer to the connection part (22) with the refrigerant conduit (16)
1) is provided. The check valve (23) is configured to be closed when the discharge pressure from the solution pump (13) is applied, and the branch pipe (24) is a pipe thinner than the diluent pipe (12).

The connecting portion (22) of the pipe (21) may be connected to the liquid phase of the low-temperature regenerator (3) or the high-temperature regenerator (2) [see the connecting portions (25) and (26)]. It may be connected to the liquid pipe (14) or the concentrated liquid pipe (25) [see the connection parts (27) and (28)].

Further, if the absorption refrigerator is of a simultaneous supply type of cold and hot water and has a water heater, the connection part (22) may be connected to a water heater (gas phase part or liquid phase part).

FIG. 2 is a view showing another embodiment of the present invention. Components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The connection part (30) of the pipe (29) is connected to the refrigerant liquid storage chamber (31). The refrigerant liquid storage chamber (31) is provided downstream of the low temperature regenerator (3) in the refrigerant conduit (16). The connecting portion (30) of the pipe (29) may be connected to a refrigerant liquid storage chamber (33) provided in the middle of the refrigerant pipe (9).

FIG. 3 is a sectional view showing the structure of the check valve. (34) is a valve seat, (35) is a valve body, and (36) is an arm movable around a shaft (37). FIG. 3 shows a state in which the valve element (35) is closed by receiving the discharge pressure from the solution pump (13), and further, a state in which the valve element (35) is opened by an imaginary line. Is shown.

The configuration of the present invention is as follows, and the operation will be described below.

First, the operation of the absorption refrigerator shown in FIG. 1 will be described. When the solution pump (13) is operating, the check valve (21) receives the discharge pressure from the solution pump (13) and is closed. Therefore, the absorption refrigerator of the present invention performs the same operation as when the pipe (21), the check valve (23), and the branch pipe (22) are not provided, and provides cooling for a room or the like.

When the flow rate of the chilled water in the chilled water pipe (17) falls below a predetermined amount or when the chilled water temperature drops below a predetermined value, the chilled water in the chilled water pipe (17) and the refrigerant in the evaporator (5) may freeze. Occurs, a detector (not shown) detects this,
In response to a signal from the detector, the control device (not shown) also stops the refrigerant pump (11), and if the chilled water temperature is still low, the control device stops the solution pump (13).

When the discharge pressure from the solution pump (13) disappears, the check valve (23) opens, and the refrigerant (mostly refrigerant vapor) in the refrigerant conduit (16) flows into the absorber (6). Due to the inflow of the refrigerant, the pressure and temperature in the absorber (6) rise, and there is no possibility that the refrigerant in the evaporator (5) and the cold water in the cold water pipe (7) freeze.

Next, the operation of FIG. 2 will be described. Solution pump (1
When 3) is operating, the pipe (29), the check valve (23) and the branch pipe (24) are operated in the same manner as the operation of the absorption refrigerator shown in FIG.
In addition, the same operation as when the refrigerant liquid storage chamber (31) is not provided is performed to cool the room or the like.

When there is a possibility that the refrigerant in the evaporator (7) and the cold water in the cold water pipe (17) may freeze, the control device (not shown) stops the refrigerant pump (11) and then stops the solution pump (13). .

When the discharge pressure from the solution pump (13) disappears, the check valve (23) opens, and the refrigerant (mostly refrigerant liquid) stored in the refrigerant liquid storage chamber (31) flows into the absorber (6). I do. Due to the inflow of the refrigerant, the pressure and temperature in the absorber (6) increase, and there is no possibility that the refrigerant in the evaporator (7) and the cold water in the cold water pipe (7) freeze.

(G) Effect of the Invention In the present invention, when the solution pump is stopped, the check valve is opened and the refrigerant from the refrigerant vapor flow path or the absorption liquid flow path or the condenser connected to the pipe is absorbed through the pipe and the branch pipe. Flows into the vessel. The pressure and temperature in the absorber rise due to the inflow of the refrigerant. Therefore, there is no possibility that the refrigerant in the evaporator and the cold water in the cold water pipe freeze.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an absorption refrigerator showing one embodiment of the present invention, FIG. 2 is a schematic diagram of an absorption refrigerator showing another embodiment of the present invention, and FIG. 3 is a check valve. FIG. 3 is a cross-sectional view showing the structure of FIG. (12) ... diluent pipe, (13) ... solution pump, (16) ...
Refrigerant pipe, (21), (29) ... pipe, (22), (25),
(26), (27), (28), (30), (32) ... connecting part, (23) ... check valve, (24) ... branch pipe, (31),
(33) ... Refrigerant liquid storage chamber.

Claims (1)

(57) [Claims] 1. An absorption refrigerator having a refrigerant vapor flow path, a refrigerant liquid flow path, and an absorption liquid flow path formed by connecting equipment such as a regenerator, a condenser, an evaporator, an absorber, a refrigerant pump, and a solution pump by piping. A pipe connecting the refrigerant vapor flow path or the absorption liquid flow path or the condenser with the downstream side of the solution pump, a check valve provided in the pipe and closed when a discharge pressure from the solution pump is applied, An absorption refrigerator comprising a branch pipe branched from a pipe to reach an absorber between a check valve and a solution pump.