JPH0560420A - Absorption refrigerating machine - Google Patents

Abstract

PURPOSE:To miniaturize an evaporator that is provided with a heat exchanging section to exchange heat with a liquid that is to be cooled and an object of cooling and an absorption refrigerating machine that is provided with a coolant transporting channel for transporting the coolant from a condenser to the evaporator without requiring a coolant circulation pump and lower their cost. CONSTITUTION:The end section of the evaporator of a coolant transporting channel 7 is formed as a coolant spreading section 7a that spreads the coolant to a heat exchanging section 4a. And an absorption refrigerating machine is constituted that is provided with a coolant spreading volume control means that is constituted of a solenoid proportional valve 8 which changes the volume of the coolant spread to the heat exchanging section 4a from this coolant spreading section 7a according to the refrigeration load, degree of opening control device 9, and detection system 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser and an evaporator in an absorption refrigerating machine, and more particularly to a heat exchanging section for exchanging heat with a liquid to be cooled. The present invention relates to an absorption refrigerating machine provided with an evaporator provided with the evaporator and a refrigerant transfer path for transferring a refrigerant from a condenser to the evaporator by a refrigerant transfer pump.

[0002]

2. Description of the Related Art As shown in FIG. 2, an absorption refrigerator of this type includes an absorber 2 and a regenerator 3 (the one shown in the figure is a high temperature regenerator 3a).
And a low temperature regenerator 3b. ), An evaporator 4 and a condenser 5. Here, the movement of the refrigerant from the condenser 5 to the evaporator 4 is performed by providing the refrigerant carrier path 7 connected to the evaporator 4 from the condenser refrigerant reservoir 5a provided in the lower part of the condenser, and in the refrigerant carrier path 7. The refrigerant transfer pump P2 is provided and the operation is performed by the refrigerant transfer pump P2. Further, in the evaporator 4, the lower region thereof is formed as an evaporator refrigerant reservoir 4b, and the heat exchange portion 4a is provided on the upper side of the evaporator refrigerant reservoir 4b.
(Cold water circulation unit as liquid to be cooled) is provided. In the heat exchange section 4a, the refrigerant exchanges heat with the liquid to be cooled due to its evaporation (the liquid to be cooled is cooled). Also,
Above the heat exchange section 4a, the refrigerant distribution section 4 is provided above the heat exchange section 4a.
0a is provided in the refrigerant circulation path 40, and the refrigerant circulation pump 40 is provided in the refrigerant circulation path 40 to guide the refrigerant accumulated in the evaporator refrigerant reservoir 4b to the heat exchange section 4a for evaporation. Is causing

[0003]

In such a prior art, basically, the amount of refrigerant sprayed to the heat exchange section is
It is determined by the amount of refrigerant conveyed by the refrigerant conveying pump. That is, in the full load state, only the amount of the refrigerant carried by the refrigerant carrying pump is sprayed,
Evaporation is caused by the evaporator and the balance is maintained. However, when the refrigerator is operated in the partial addition state, a part of the refrigerant becomes invalid. Therefore, the evaporator refrigerant pool is required to retain the invalid refrigerant liquid, and the refrigerant circulation pump described above is used to recirculate the refrigerant liquid in the evaporator refrigerant pool to the heat exchange section. And a circuit is needed. Here, the refrigerant circulation pump and the circulation path hinder the downsizing of the absorption chiller and cannot be ignored in terms of cost, and the refrigerant circulation pump requires a high auxiliary starting force. Therefore, an object of the present invention is to obtain a compact and low-cost absorption refrigerating machine that does not require a refrigerant circulation pump.

[0004]

In order to achieve this object, the absorption refrigerating machine according to the present invention has a characteristic structure in which an end portion on the evaporator side of a refrigerant transfer path is provided with a refrigerant distribution section for distributing a refrigerant to a heat exchange section. In addition to the above, there is provided a refrigerant spray amount control means for changing the amount of refrigerant sprayed from the refrigerant spray part to the heat exchange part according to the refrigeration load, and the operation and effect thereof are as follows.

[0005]

In other words, in this absorption refrigerating machine, the refrigerant sent from the condenser to the evaporator via the refrigerant conveying path is directly sprayed from the refrigerant spraying section to the heat exchanging section for evaporation. Further, the sprayed amount is quantitatively controlled by the refrigerant sprayed amount control means, and is made to correspond to the refrigeration load. An example of the refrigerating load is temperature information of the outlet side of the cold water as the liquid to be cooled, which is higher than the target temperature, and the refrigerating load is high, and vice versa. The refrigeration load is low.). In addition, in the configuration of the present application, the amount of the dropped refrigerant is set to be commensurate with the amount of the evaporated refrigerant in the evaporator, so that the dripped refrigerant is substantially evaporated.

[0006]

As a result, ineffective refrigerant is prevented from remaining in the evaporator, so that it is not necessary to provide a refrigerant circulation pump and a circulation path for recirculating the refrigerant accumulated in the evaporator refrigerant reservoir in the evaporator. .. As a result, it has become possible to reduce the size and cost of the absorption chiller and reduce the auxiliary starting force.

[0007]

Embodiments of the present application will be described with reference to the drawings. FIG. 1 is a configuration diagram of an air-cooled double-effect absorption refrigerator. This refrigerator 1 comprises an absorber 2, a regenerator 3 (the one shown includes a high temperature regenerator 3a and a low temperature regenerator 3b), an evaporator 4 and a condenser 5. Then, a concentrated solution L1 in which water as a refrigerant is dissolved in LiBr as an absorbent at a high concentration is regenerated by the low temperature regenerator 3b, and an intermediate concentration liquid L2 having an intermediate concentration is regenerated by the high temperature regenerator 3a and absorbed by the solution pump P1. The diluted solution L3 produced in the absorber 2 is returned to the regenerator 3 (the high temperature regenerator 3a and the low temperature regenerator 3b in this order) while being admitted to the regenerator 2. On the other hand, the water w as the refrigerant is the steam v moving from the regenerator 3.
Is condensed in the condenser 5 to become water w, which is sent to the evaporator 4 by the refrigerant transfer pump P2 and evaporates to cool the cold water W1 as the heat transfer medium, while the steam v becomes
It is configured to move to the absorber 2 and be absorbed by the absorbent. Here, the cold water W1 in the cooled state is circulated from the evaporator 4 to the air conditioner 6, and the air conditioner 6 performs cooling operation.

The structure for moving the refrigerant from the condenser 5 to the evaporator 4, which is a characteristic structure of the present application, will be described below. As shown in the figure, a condenser refrigerant reservoir 5a is provided in the lower portion of the condenser 5, and a refrigerant transfer path 7 reaching the evaporator 4 is provided therein. Further, the above-described refrigerant transfer pump P2 is provided in the refrigerant transfer path 7. Further, the evaporator-side end of the refrigerant transport path 7 is provided with a heat exchange section 4a provided in the evaporator 4 (water w as a refrigerant evaporates at this portion, and cold water W1 as a liquid to be cooled is cooled). Is provided on the upper side in the up-down direction of the machine base, and is configured as a refrigerant distribution section 7a for distributing the refrigerant to the heat exchange section 4a. Further, an electromagnetic proportional valve 8 that determines the throttle amount of the refrigerant transport path 7 is arranged near the above-mentioned refrigerant distribution portion 7a. Here, the solenoid proportional valve 8 controls the amount of the refrigerant dropped on the heat exchange section 4a of the evaporator 4. Further, the opening of the solenoid proportional valve 8 is controlled by the opening information output from the opening control device 9. The opening control device 9 includes a detection system 10 that detects the outlet temperature of the cold water W1 described above, and the difference between the detection result and the target cold water temperature is recognized as a refrigeration load, and the heat exchange unit in the evaporator 4 is recognized. 4a is configured to control the amount of refrigerant sprayed. (Here, the solenoid proportional valve 8, the opening control device 9, and the detection system 10 are collectively referred to as a refrigerant distribution amount control means.) In the figure, the flow connected from the evaporator refrigerant reservoir 4b to the solution pump P1. The passage 11 is a diluting operation flow path used during the dilution operation. Since this flow path 11 is used as needed, an opening / closing valve 12 is provided.

The operation of the evaporator 4 in the absorption refrigerator 1 will be described below. The opening / closing information of the solenoid proportional valve 8 is controlled by the opening information calculated by the cold water outlet temperature, and the evaporator 4 is operated. The amount of sprayed refrigerant is always maintained at an appropriate amount (most of the sprayed amount is evaporated in the evaporator 4).
Therefore, in the absorption refrigerator 1 of the present application, the refrigerant circulation pump is not necessary, and the evaporator refrigerant reservoir 4 is not necessarily provided in the lower portion of the evaporator.
b is not needed. As a result, it is possible to downsize the refrigerator and reduce the auxiliary starting force.

[Other Embodiments] Other embodiments of the present application are listed below. (A) In the above embodiment, the detection of the refrigeration load was detected by the temperature of the cold water at the outlet of the evaporator, but the refrigeration load can be estimated by other methods. For example, the cold water temperature in the output side device (air conditioner) where the cold water is frozen may be used as a reference. Further, the method of determining the amount of refrigerant sprayed for this refrigeration load can be variously changed depending on the method for detecting and estimating the refrigeration load.

(B) In the above embodiment, the solenoid proportional valve 8 and the opening degree control device 9 are used as the refrigerant spraying amount control means, but the refrigerant spraying amount control means may be other methods. For example, a control device (for example, an inverter circuit) that controls the number of rotations of the refrigerant transport pump P2 by the refrigeration load detection signal to change the refrigerant spray amount may be used.

(C) Further, in the above embodiment, an example of the air-cooled double-effect absorption refrigerator was explained as the absorption refrigerator 1, but this is a water-cooled or single-effect absorption refrigerator. May be.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an absorption refrigerator according to the present application.

FIG. 2 is a diagram showing a configuration of a conventional absorption refrigerator.

[Explanation of symbols]

 4 Evaporator 4a Heat Exchange Section 5 Condenser 7 Refrigerant Conveying Path 7a Refrigerant Dispersion Section 8 Refrigerant Dispersion Amount Control Means 9 Refrigerant Dispersion Amount Control Means 10 Refrigerant Dispersion Amount Control Means

Claims (1)

[Claims] 1. An evaporator (4) having a heat exchange section (4a) for exchanging heat with a liquid to be cooled, and a refrigerant transfer from the condenser (5) to the evaporator (4). An absorption chiller comprising a refrigerant transfer path (7) for transfer by a pump (P2), wherein an end of the refrigerant transfer path (7) on the evaporator side is connected to the heat exchange section (4a). A refrigerant spraying amount control means (8) for changing the amount of the refrigerant sprayed from the refrigerant spraying part (7a) to the heat exchanging part (4a) according to the refrigerating load. ), (9), (10) provided absorption refrigerator.