JPH04295559A - Absorption refrigerator - Google Patents

Abstract

PURPOSE:To provide an absorption refrigerator of a small capacity for domestic use or the like in which operation is stable. CONSTITUTION:In a diluted solution tube running from an absorber 21 to a regenerator 1, a solution pump 12 to increase or decrease flow volume of diluted solution within the tube corresponding to a liquid level of condensed solution in the regenerator 1. On the other hand, in a condensed solution tube running from the regenerator 1 to the absorber 21, a flow volume controller 17 is provided to increase or decrease flow volume of the condensed solution within the tube corresponding to a quantity of pressure in the regenerator 1. Thus, the flow volume at each element is so controlled that no superfluence or shortage will occur, and thereby, a stable operation can be maintained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a small-capacity absorption refrigerating machine for domestic or nearby use.

0002

[Prior Art] Conventionally used single-effect natural circulation type absorption refrigerators utilize height differences.
Circulation control of the absorption liquid is not necessary (for example,
(See Publication No. 1032). However, for absorption chillers that require compactness for small capacity machines such as those for home use,
Since the height is not sufficient, it is impossible to adopt a natural circulation system.

0003

That is, in a single-effect absorption refrigerator, there are two absorption liquid flow systems: a dilute solution system and a concentrated solution system. This dilute solution pipeline runs from the absorber, through the dilute solution tank, through the solution pump, through the solution heat exchanger, to the regenerator, and the concentrated solution pipeline exits the regenerator, passes through the solution heat exchanger, and ends up with the absorber. If the amounts of circulating fluid in both pipes do not match, there will be excess or deficiency in the amount of fluid in each element, making it impossible to maintain stable operation.

In view of the above circumstances, the present invention detects the liquid level height with a float sensor for detecting the liquid level on the concentrated liquid side in the regenerator, increases or decreases the flow rate of the dilute solution according to this liquid level, and increases or decreases the flow rate of the dilute solution in the regenerator. The object of the present invention is to provide an absorption refrigerator that solves the above problem by increasing or decreasing the flow rate of a concentrated solution depending on the pressure level of the liquid.

[0005]

[Means for Solving the Problems] The present invention provides an absorption refrigerator comprising an absorber, a regenerator, a condenser, and an evaporator.
The dilute solution pipeline from the absorber to the regenerator is equipped with a solution pump that increases or decreases the flow rate of the dilute solution in this pipeline depending on the liquid level of the concentrated solution in the regenerator. The concentrated solution conduit leading to the regenerator is equipped with a flow rate control device that increases or decreases the flow rate of the concentrated solution in this conduit in accordance with the magnitude of the pressure within the regenerator.

[0006]

[Operation] Due to the above structure, the refrigerant vapor generated in the regenerator is led to the condenser to become a refrigerant liquid, and this refrigerant liquid is dispersed in the evaporator to perform cooling action using the latent heat of vaporization, and at the same time absorb this solution. It is absorbed into a diluted solution and returned to the regenerator from the solution tank.

In this case, when the regenerator pressure is 0 to hmmHg (h is the pressure corresponding to the difference in position between the liquid level of the regenerator and the highest point of the absorber), when the regenerator float sensor emits a Hi signal, the dilute solution When the valve is opened and Lo is emitted, the dilute solution valve opens. At this time, the concentrated solution valve remains open and the solution circulation pump maintains Hi operation.

When the regenerator pressure is h~HmmHg (H is the pressure corresponding to the difference in position between the highest and lowest points of the concentrated liquid system), when the regenerator float sensor issues a Hi signal, the solution pump operates in Lo mode. . At this time, the concentrated solution valve and the dilute solution valve remain open.

When the regeneration pressure is HmmHg or more, if the regenerator float sensor issues a Hi signal, the solution pump goes to Lo.
When the regenerator float sensor issues a Lo signal, the solution pump operates at Hi mode. At this time, the concentrated solution valve of the flow controller remains closed, the orifice throttles the flow rate, and the lean solution valve remains open.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on drawings of embodiments.

FIG. 1 shows a schematic diagram of an absorption chiller, in which 1 is a regenerator equipped with a combustion device 2, and a condenser 3 that uses refrigerant vapor as a refrigerant liquid is connected to the regenerator 1 via a pipe 4. The tip of the refrigerant pipe 5 led out from the condenser 3 is connected to a refrigerant tank 7 provided at the bottom of the evaporator 6, and a refrigerant circulation pump 8 provided at the lower end outlet side of the refrigerant tank 7 is connected to the refrigerant circulation system. A solution tank 10 is connected to a solution tank 10 through a pipe 9, and a solution pump 12, an ON-OFF controlled dilute solution valve 13, and a solution heat exchanger 14 are sequentially connected to a dilute solution pipe 11 led out from the solution tank 10,
This tip is connected to the regenerator 1. A regenerator float sensor 15 is provided on the side of the regenerator 1, and a flow rate control device 17 consisting of a concentrated solution valve 17a and an orifice 17b connected in parallel is connected to the concentrated solution piping 16 that serves as the concentrated solution system of the regenerator 1.
has been established. 18 is a refrigerant float sensor provided in the refrigerant tank 7, and 19 is a thermistor type condenser temperature sensor attached to the pipe 4 facing the condenser 3.

Next, to explain this operation, in the regenerator 1, the diluted solution that absorbs the refrigerant is heated and boiled by the combustion device 2, producing a concentrated solution and refrigerant vapor. A concentrated solution valve 17a is arranged in parallel with the concentrated solution piping 16 in the same piping.
and enters the solution heat exchanger 14 through the orifice 17b. Further, the concentrated solution is distributed through the concentrated solution pipe 16 into the heat exchanger tube of the absorber 21 by the concentrated solution distribution device 20 . In the absorber 21, the concentrated solution is evaporated in the evaporator 6, absorbs the refrigerant vapor introduced through the pipe 22, becomes a dilute solution, and enters the solution tank 10, which is a dilute solution reservoir, through the pipe 23. The dilute solution returns to the regenerator 1 again through the dilute solution piping 11, a solution pump 12, a dilute solution valve 13, and a solution heat exchanger 14 installed in the middle.

On the other hand, the refrigerant is evaporated in the regenerator 1, passes through the pipe 4, is cooled in the condenser 3, and is liquefied to become a refrigerant liquid. The refrigerant liquid enters a refrigerant tank 7 which is a refrigerant liquid reservoir through a pipe 5. The refrigerant liquid in the refrigerant tank 7 passes through the pipe 9 and is dispersed onto the heat transfer tubes of the evaporator 6 from the refrigerant distribution device 24 by the refrigerant circulation pump 8 . The refrigerant liquid evaporates on this heat transfer tube, cools the cold water coming in from the cold water inlet pipe 25, and sends it out from the cold water outlet pipe 26. This cold water is used for indoor cooling. The evaporated refrigerant vapor passes through the pipe 22 and enters the absorber 21 where it is absorbed.

The absorber 21 and the condenser 3 are cooled by air cooling or water/air cooling. Absorber 2 by cooling fan 27
1. Cool the condenser 3. In the case of the water-air cooling system, the cooling water in the cooling water tank 28 is sprayed by the cooling water pump 29 through the cooling water piping 30 from the cooling water distribution device 31 to the absorber 21 or the condenser 3 for cooling.

In this case, in the dilute solution piping 11 leading from the absorber 21 to the regenerator 1, the flow rate of the dilute solution in this piping is increased or decreased depending on the level of the concentrated solution in the regenerator 1. The flow rate of the concentrated solution in the concentrated solution piping 16 extending from the vessel 1 to the absorber 21 is increased or decreased in accordance with the magnitude of the pressure within the regenerator 1. First, the pressure inside the regenerator is estimated using the condenser temperature sensor 19.

Here, (1) When the regeneration pressure is 0 to hmmHg, the concentrated liquid system cannot expect to flow from the regenerator 1 to the absorber 3. Therefore, the dilute solution valve 13 is closed so that the dilute solution cannot be sent to the regenerator 1 by the solution pump 12 (except when the liquid level in the regenerator 1 is higher than the highest point on the absorber 21 side). That is, when the regenerator float sensor 9 issues a Hi signal, the dilute solution valve 13 is closed, and when it issues a Lo signal, the dilute solution valve 13 is opened. Solution pump 12 continues Hi operation. The concentrated solution valve 17a is open so that there is no resistance.

(2) When the regeneration pressure is between h and HmmHg, the concentrated liquid system flows from the regenerator 1 to the absorber 21. As the regeneration pressure increases, the liquid level of the absorption liquid between the regenerator 1 and the solution heat exchanger 14 decreases, but since the liquid level always exists below HmmHg, refrigerant vapor does not escape to the absorber 21 side. Therefore, if too much of the dilute solution is prevented from being sent to the regenerator 1, stable operation will be achieved. That is, when the regenerator float sensor 15 issues a Hi signal, the solution pump 12 goes Lo.
and reduce the feed to regenerator 1. Dilute solution valve 13
The amount fed to the regenerator 1 is not set to 0 by opening the pump (if it is stopped, crystallization is likely to occur). Further, the concentrated solution valve 17a is left open to reduce resistance.

■When the regeneration pressure is HmmHg or more, the liquid level of the absorbing liquid in the concentrated liquid system decreases, and the liquid level from the regenerator 1 to the solution heat exchanger 14 decreases.
At a height between the two, refrigerant vapor escapes toward the absorber 21, making stable operation impossible. For this reason, the concentrated solution valve 10a is closed to provide flow path resistance (the absorption liquid flows only through the orifice 17b). When the regenerator float sensor 15 issues a Hi signal, the solution pump 12 operates in a Lo mode, and when the regenerator float sensor 15 issues a Lo signal, the solution pump 1 operates in a Lo mode.
2 performs Hi operation to prevent refrigerant vapor from blowing through and continue stable operation.

[0019]

[Effects of the Invention] As described above, the flow rate of the dilute solution can be increased or decreased in accordance with the level of the concentrated solution in the regenerator, and the flow rate of the concentrated solution can be increased or decreased in accordance with the magnitude of the pressure in the regenerator. As a result, stable operation can be maintained without causing excess or deficiency in the flow rate in each element, which in turn can reduce the amount of absorption liquid filled, contributing to cost reduction.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 Regenerator 3. Condenser 6 Evaporator 7 Refrigerant tank 8 Refrigerant circulation pump 10 Solution tank 12 Solution pump 13 Dilute solution valve 14 Solution heat exchanger 15 Regenerator float sensor 17 Flow rate control device 17a Concentrated solution valve 17b Orifice

Claims (1)

[Claims] Claim 1: In an absorption refrigerator consisting of an absorber, a regenerator, a condenser, and an evaporator, a dilute solution pipe line leading from the absorber to the regenerator has a regenerator that controls the flow rate of the dilute solution in the pipe line. A solution pump is installed that increases or decreases the concentration depending on the level of the concentrated solution in the regenerator. An absorption refrigerating machine characterized by being equipped with a flow control device that increases or decreases the flow rate according to the flow rate.