JPS63282460A - Absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] B) Industrial application field The present invention relates to an absorption refrigerator or an absorption heat pump (hereinafter referred to as an absorption refrigerator) that uses water as a refrigerant and a salt solution such as lithium bromide as an absorption liquid. be.

(b) Conventional technology In this type of conventional absorption refrigerator, the temperature of cold water from the evaporator is detected by a detector, and the detector outputs a signal according to the temperature, and when the signal is input, The control device outputs a signal corresponding to the signal to the control valve, controls the opening degree of the control valve, and adjusts the amount of heating to the absorption liquid in the generator (% Kosho 6
1-38786) is publicly known.

(c) Problems to be solved by the invention However, in conventional absorption refrigerators of this type, heating of the absorption liquid in the regenerator may not be reliably stopped during the stoppage, and the absorption liquid in the regenerator There was a possibility that it would be heated and concentrated and crystallize. Therefore, in order to reliably shut off the steam or hot water that serves as a heat source, it is necessary to provide a shutoff valve in addition to the control valve, or to use a special control valve with excellent shutoff performance.

The present invention is intended to solve the above-mentioned problems, and its technical object is to provide an absorption refrigerating machine in which there is no possibility of heating the absorption liquid in the regenerator even when the absorption refrigerating machine is stopped.

B) Means for solving the problem The present invention solves the above problem, and the heat exchanger in the regenerator has an area above the liquid level depending on the liquid level of the absorption liquid in the regenerator. a detector for detecting the temperature of cold water from the evaporator, a control valve for a pipe that guides the absorption liquid from the regenerator to the absorber, and a signal from the detector for inputting the signal to control the and a control device that outputs a signal to the valve, and the control device outputs a signal to increase the opening of the control valve when the signal from the detector is a lower input than normal, and outputs a signal to the regenerator. The degree of opening of the valve is changed so that the amount of heating of the absorption liquid in the filter is reduced in the heat exchanger.

(E) Function In the absorption refrigerator of the present invention, the detector detects the temperature of the chilled water from the evaporator, and if the signal from the detector to the control device is lower (higher) than normal, the control device controls the control valve. Increase in opening (
(reduction) control, and the opening degree of the control valve is changed so that the amount of heating of the absorption liquid in the orderer is decreased (increased) in the heat exchanger.

(f) Examples Examples of the absorption refrigerator of the present invention will be described below with reference to the drawings. The absorption refrigerator shown in the figure is an embodiment of the present invention, and the configuration of the figure will be explained first.

(1) is a heat exchanger that transfers heat between steam and absorption liquid;
2) is a regenerator that heats and separates the refrigerant using the heat from the heat exchanger (1), (3) is a condenser, and (4) is the condenser (
(3) is an evaporator that obtains cold water for air conditioning from a water cooler (5) by using the latent heat when dispersing and vaporizing the refrigerant, (6) is an absorber, (7) is a refrigerant pump, ( 8) is an absorption liquid pump. The heat exchanger (1) is installed at the lower part of the regenerator (2) so that the heat exchange area below the liquid level changes as the amount of absorption liquid in the regenerator (2) increases or decreases.

(9) is a pipe that guides the refrigerant from the condenser (3) to the evaporator (4), (10) is a refrigerant circulation path that includes the refrigerant pump (7), and (11) is a pipe that leads the refrigerant from the condenser (3) to the evaporator (4). The dilute absorption liquid pipe (12) is a concentrated liquid pipe that supplies the absorption liquid from the regenerator (2) to the absorber (6), and is connected to the lowest level of the regenerator (2). (13) is the dilute absorption liquid pipe (11)
This is a heat exchanger that transfers heat between the absorption liquid in the concentrated liquid pipe (12) and the absorption liquid in the concentrated liquid pipe (12). (14), (15) are cold water pipes connected to the water cooler (5), (16), (17),
(18) is a cooling water pipe connecting coolers (19) and (20) in series.

(21) is a temperature detector disposed in the cold water pipe (15), and (22) is a control device that controls the opening degree of the control valve (23) based on the signal from the temperature detector (21). It is.

(24) is a steam pipe. (25) is a steam trap, which sends only the drain from the steam pipe (24) connected to the heat exchanger (1) to a real well tank (not shown).

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

During operation of the absorption refrigerator of the present invention, the temperature detector (2
When the controller 1) detects an increase in the temperature of the cold water in the cold water pipe (15) than during normal operation, it outputs a signal corresponding to the temperature of the cold water to the control device (22). When the control device (22) receives the signal, it outputs a signal to control the opening of the control valve (23). When the opening degree of the control valve (23) is controlled to be reduced by a signal from the control device (22), the liquid level of the absorbing liquid in the regenerator (2) rises, and therefore the level of the absorbing liquid drops below the level of the absorbing liquid. The heat exchange area of a certain heat exchanger (1) increases. Due to this increase in heat exchange area, the amount of heat exchanged with the absorption liquid in the regenerator (2) increases, so the refrigerating capacity of the absorption refrigerator increases, and the temperature of the cold water in the cold water pipe (2) decreases. start.

When the absorption chiller continues to operate and the temperature detector (21) detects a drop in the temperature of the chilled water in the chilled water pipe (15) than during normal operation, a signal corresponding to this chilled water temperature is sent to the control device (22). ). When the control device (22) receives the signal, the control device (22) outputs a signal so as to increase the opening of the control valve (23). When the increase is controlled by the signal from
The liquid level of the absorption liquid in the regenerator (2) falls, and therefore the heat exchange area of the heat exchanger (1) located below the level of the absorption liquid decreases. Due to this reduction in heat exchange area, the amount of heat exchanged with the absorption liquid in the regenerator (1) decreases, so the refrigerating capacity of the absorption refrigerator decreases, and the temperature of the cold water in the cold water pipe (15) increases. start.

Furthermore, the absorption refrigerator continues to operate, and the temperature detector (21)
When detecting an excessive drop in the temperature of the cold water in the cold water pipe (15), that is, a temperature to the extent that the cold water is about to freeze, it outputs a signal corresponding to this cold water temperature to the control device (22).

The control device (22) operates the control valve (22) when the signal is input.
23) outputs a signal to fully open the opening. When the opening degree of the control valve (23) is controlled to be fully open by the signal from the control device (23), the absorption liquid in the regenerator (2) is almost exhausted, and therefore the heat exchanger under the surface of the absorption liquid vessel(
The heat exchange area of 1) is zero. This allows the regenerator (2)
Since there is no more heat exchange with the absorption liquid inside, the refrigerating capacity of the absorption refrigerator is lost, and the temperature of the cold water in the cold water pipe (15) starts to rise.

The control valve (23) is constructed so that it opens fully when the operation of the absorption chiller is stopped, so when the user stops the operation of the absorption chiller, the control valve (23) ) is fully opened and sends all the absorption liquid in the regenerator (2) to the absorber (6). As a result, the amount of heat applied to the absorption liquid is completely eliminated, and since there is no possibility that any amount of heat is added to the absorption liquid, the absorption liquid is not concentrated and crystallized.

In the present invention, an example of a single-effect absorption refrigerator has been described, but it goes without saying that this example can also be applied to a double-effect absorption refrigerator.

(g) Effects of the Invention In the absorption refrigerator of the present invention, a detector is installed in a pipe that detects the temperature of cold water from the evaporator and, depending on the detected value, guides the absorption liquid from the regenerator to the absorber. The opening degree of the control valve is controlled by a signal from the control device. By controlling the opening degree of this control valve, the area of the heat exchanger below the liquid level in the regenerator is changed, the amount of heating to the absorption liquid in the regenerator is changed, and the refrigerating capacity of the absorption refrigerator is changed. Therefore, when the absorption chiller stops operating, or when the temperature of the chilled water from the evaporator drops excessively and there is a risk that the chilled water may freeze, a signal from the detector is input to the control device, and the control device receives the signal. The refrigerating capacity of the absorption refrigerating machine can be fully achieved by simply outputting and fully opening the control valve, so even when the absorption refrigerating machine is stopped, the absorption liquid in the regenerator can be heated. It is possible to provide an absorption refrigerator that has no possibility of crystallization, that is, no possibility of crystallization of the absorption liquid.

[Brief explanation of the drawing]

The figure is a schematic structural explanatory diagram of an absorption refrigerator of the present invention. (1)... Heat exchanger, (12)... Concentrated liquid pipe line,
(15)...Cold water pipe, (21)...Temperature detector, (22)...Control device, (23)
...control valve.

Claims (1)

[Claims] (1) Regenerators and condensers that use steam or hot water as a heat source,
In an absorption refrigerator in which equipment such as an evaporator, an absorber, a refrigerant pump, and an absorption liquid pump are connected via piping to form a circulation path for refrigerant and absorption liquid, the heat exchanger in the regenerator is connected to the absorption liquid in the regenerator. It is installed so that the area above the liquid level increases or decreases depending on the liquid level height, and there is a detector that detects the temperature of the cold water from the evaporator and a control tube that guides the absorption liquid from the regenerator to the absorber. a control device that inputs a signal from the detector and outputs a signal to the control valve, and the control device controls the control valve when the signal from the detector is a lower input than normal. An absorption refrigerating machine characterized in that the opening degree of the control valve is changed so that the amount of heating of the absorption liquid in the regenerator is decreased in the heat exchanger by outputting a signal for increasing the opening degree.