JPH01273965A - Absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To keep a coolant liquid surface in an evaporator more than a specified level, prevent a cavitation in a coolant pump and control a capacity of a freezing device by a method wherein as a coolant liquid surface is decreased as a load is decreased, a decrease is detected and an amount of dispersion of solution liquid as the absorbing container is reduced. CONSTITUTION:A liquid level sensor 11 is arranged in a coolant liquid reservoir 10, a bypassing passage 13 is arranged. When a coolant liquid surface is lowered down to a predetermined level due to a reduction in load, a control valve 12 is opened and mixed solution is bypassing and then an amount of dispersion of solution liquid from a dispersion nozzle 8 is reduced. With this arrangement, the coolant liquid surface in the evaporator is kept at a value more than a certain level due to a restriction of evaporation of the coolant and a cavitation of the coolant pump is prevented. As a load is increased, the liquid is lifted up and the control valve 12 is closed and a freezing capacity is rapidly increased as the load is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in capacity control of absorption refrigerators.

[Conventional technology]

Conventionally, capacity control in absorption refrigerators has been based on increases and decreases in the amount of heat source, and in response to a drop in the refrigerant liquid level, the liquid level has been maintained by forcibly mixing a solution into the refrigerant side. This happens when the load becomes smaller, the amount of heat source is reduced, and the refrigerant liquid level decreases.

Because the refrigerant pump causes cavitation.

This is because to prevent this, it is necessary to maintain the liquid level above a certain level.

[Problem to be solved by the invention]

The above conventional method of forcibly mixing the solution into the refrigerant maintains the refrigerant level and also reduces the refrigeration capacity, but when the load increases again, the amount of refrigerant increases and the refrigerant level rises. However, due to the influence of the mixed solution, the refrigerating capacity cannot be increased in accordance with the increase in load.

To solve this problem, it is necessary to operate with insufficient capacity for a long period of time, or to purify the refrigerant and operate with extremely low refrigerating capacity for a certain period of time. That is, in either operation, there is a time when the temperature at which the cold water is taken out cannot be maintained at the desired temperature.

Purpose of use of cold water and cases where the law applies.

This is a big problem.

To solve this problem, it is necessary to devise a way to smoothly transition from low load to high load without mixing the solution with the refrigerant.

[Means to solve the problem]

In order to solve the above-mentioned problems, the absorption refrigerator of the present invention has the following features:
It is characterized by providing a means for detecting the refrigerant liquid level in the evaporator, as well as a solution spraying amount control means for controlling the amount of solution sprayed in the absorber when the refrigerant liquid level detected by the detecting means is below a predetermined level. That is.

[Effect]

This invention is constructed as described above.

When the refrigerant liquid level decreases due to a decrease in load.

By detecting this, it is possible to reduce the amount of solution sprayed in the absorber, reduce the refrigerant absorption capacity of the absorber, and suppress refrigerant evaporation, thereby expanding the capacity control range of the refrigerator. Even when the load increases, the refrigerating capacity can be quickly increased by increasing the amount of solution sprayed and increasing the absorption capacity.

〔Example〕 An embodiment of the present invention will be described below based on the drawings.

The drawing shows only the main parts of the absorption refrigerator.

In the figure, 1 is an evaporator and 2 is an absorber.

The refrigerant liquid condensed in the condenser is supplied to the evaporator 1, and the refrigerant liquid exchanges heat with cold water from the cold water pipe 3.

It absorbs heat from the cold water and evaporates, thereby lowering the temperature of the cold water and supplying it to the load. Here saucer 4
The refrigerant liquid that has fallen is recirculated by a refrigerant pump 5 and sprayed from a nozzle 6.

On the other hand, the concentrated absorption solution concentrated in the regenerator is mixed with the dilute solution from the solution pump 7 and supplied to the absorber 2, and is sprayed onto the cooling water pipe 9 from the nozzle 8 to remove the refrigerant evaporated in the evaporator 1. It is meant to be absorbed.

The diluted solution that absorbs the refrigerant is collected at the bottom of the absorber, and a portion is recycled by the solution pump 7.

The other part is sent to the regenerator via a solution pump.

It is heated and regenerated.

The above is a known absorption refrigerator, and two examples will be described.

A liquid level detector 11 that detects the refrigerant liquid level in the refrigerant liquid reservoir 10
In order to control the amount of solution sprayed from the solution spray nozzle 8, a bypass passage 13 is provided which has a control valve 12 that bypasses the mixed solution before spraying to the bottom of the absorber 2. When the amount drops to a set level, the detector 11 detects this and opens the control valve 12 to bypass the mixed solution, thereby reducing the amount of solution sprayed from the spray nozzle 8.

'' By configuring as described in item 1, when the load decreases and the refrigerant liquid level in the evaporator 2 decreases.

The control valve 12 is opened to bypass the solution, and the amount of solution sprayed through the nozzle 8 is reduced to lower the absorption capacity, thereby suppressing evaporation of the refrigerant, thereby maintaining the refrigerant liquid level in the evaporator above a certain level. , the capacity of the absorption refrigerator can be controlled while preventing cavitation of the refrigerant pump. Furthermore, as the load increases and the amount of refrigerant liquid increases, the liquid level also rises, so the control valve 12 closes, the amount of solution sprayed increases, and the absorption capacity also increases, so the refrigeration capacity can be adjusted quickly to match the increase in load. can be raised.

In this embodiment, since the solution before being sprayed from the nozzle 8 is bypassed, the conditions on the ejector drive side do not change and the circulation of the concentrated solution does not deteriorate.

〔Effect of the invention〕

As described above, according to the present invention, during low load, the refrigerant liquid level in the evaporator is maintained above a certain level without forcibly mixing the solution, and the capacity is controlled while preventing cavitation of the refrigerant pump. I can do it.

In addition, when the load increases, the refrigeration capacity can be increased quickly, so there is no need to operate at insufficient capacity for a long time.
Extreme Q: The refrigerating capacity does not become small, and the transition from low load to high load can be made smoothly, allowing for efficient and stable operation.

[Brief explanation of the drawing]

The drawing is a configuration diagram of only essential parts showing an embodiment of the present invention. 1: Evaporator, 2: Absorber, 8: Solution spray nozzle 10: Refrigerant reservoir, 11: Liquid level detector. 12: Control valve, 13: Bypass path

Claims (1)

[Claims] It is characterized by providing a means for detecting the refrigerant liquid level in the evaporator, as well as a solution spraying amount control means for controlling the amount of solution sprayed in the absorber when the refrigerant liquid level detected by the detecting means is below a predetermined level. absorption refrigerator.