JPH11230632A - Absorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let a refrigerant flowing out of a low-temperature reproducer flow to a condenser without delay, by detecting the sudden increase of the flow with a detection means, when the flow of a refrigerant increases suddenly at start up or at sudden increase, and increasing the flow of the refrigerant to be sent to a condenser with an adjusting means. SOLUTION: A detection means is equipped with a refrigerant tank 9 which is interposed in the middle of the pipe 7 for supplying a condenser 11 with a refrigerant liquefied with a low-temperature reproducer 12, and when the flow of the refrigerant increases suddenly, it detects the rise of liquid level of the refrigerant within the refrigerant tank 9. Accompanying this detection, the float valve 81 as an adjusting means is opened to supply the refrigerant to the condenser 11 through the float valve 81 and also supply it to the condenser 11 via an orifice 71 from the outlet of the refrigerant tank 9. Hereby, the refrigerant flowing out of the low-temperature reproducer 12 comes to flow to the condenser 11 without delay, thus the operation efficiency can be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double effect absorption refrigerator in which refrigerant vapor generated in a high-temperature regenerator is supplied to a low-temperature regenerator to be condensed, and refrigerant liquefied by the condensation is supplied to a condenser. It is about.

[0002]

2. Description of the Related Art As shown in FIG. 2, a double effect type absorption refrigerator has an upper body comprising a condenser (11) and a low temperature regenerator (12).
(1) Lower trunk (2) consisting of evaporator (21) and absorber (22), high temperature regenerator (3) with built-in burner (31), high temperature heat exchanger
(4) The low-temperature heat exchanger (5) and the like are connected to each other by pipes, and the absorbent is pumped by the absorbent pump (6) into the high-temperature regenerator (3), the low-temperature regenerator (12) and the absorber (22). The refrigeration cycle is realized by circulating between the refrigeration cycles.

In a double-effect absorption refrigerator, as shown in FIG. 3, an orifice (7) is provided in a pipe (7) for supplying a refrigerant liquefied by a low-temperature regenerator (12) to a condenser (11). 70) is attached, and the refrigerant liquefied by the low-temperature regenerator (12) is decompressed and supplied to the condenser (11). This keeps the inside of the low-temperature regenerator (12) at a low pressure,
The refrigerant vapor generated in (12) is condensed and liquefied in the condenser (11). On the other hand, the refrigerant vapor generated in the high-temperature regenerator (3) is condensed in a heat transfer tube in the low-temperature regenerator (12), liquefied while giving heat of condensation to the absorbing liquid, and becomes a refrigerant liquid to form the above-described orifice After being supplied to the condenser (11) via (70), the refrigerant returns to the evaporator (21) together with the refrigerant liquid liquefied in the condenser (11).

As shown in FIG. 2, a pipe for supplying a fuel gas to a burner (31) in a high-temperature regenerator (3) has a gas valve (3).
2) is attached, the temperature of the cold water flowing out of the evaporator (21)
(Cold water outlet temperature Tc_out) to maintain the target value, gas valve (3
The opening of 2) is controlled, and the supply amount of fuel gas is adjusted.

[0005]

By the way, in the double effect type absorption refrigerator, the heat input to the high temperature regenerator (3) generates steam in the high temperature regenerator (3) in accordance with the heat input. Ideally, the low-temperature regenerator (12) generates the same amount of steam by the steam, and the maximum efficiency is obtained at this time. In order to approach this ideal state as much as possible, it is necessary to employ an orifice (70) having an appropriate hole diameter and to perform a reduced pressure of an appropriate size.

However, in an absorption refrigerator,
At startup or when the load suddenly increases, the flow rate of the refrigerant flowing out of the low-temperature regenerator (12) sharply increases.In consideration of this, the orifice (70) has a smaller diameter than the optimal hole diameter for efficiency. Also, those having a large hole diameter have been adopted. Therefore, in the conventional double-effect absorption refrigerator, after the start-up, the decompression in a steady operation state in which the refrigeration load is stable becomes insufficient, and there has been a problem that the efficiency is reduced due to this. Furthermore, when the refrigerating load is reduced, there is a problem that the efficiency is remarkably reduced due to steam release.

An object of the present invention is to allow the refrigerant generated at the time of start-up or a sudden increase in load to flow to the condenser without any delay. Provide an absorption refrigerator that can give
Thereby, the operation efficiency is improved as compared with the conventional case.

[0008]

In the absorption refrigerator according to the present invention, the refrigerant liquefied by the low-temperature regenerator (12) is cooled by the condenser.
A detecting means for detecting a change in the flow rate of the refrigerant flowing out of the low-temperature regenerator (12), and a condenser (11)
Adjusting means for adjusting the flow rate of the refrigerant fed to the cooling medium and applying an appropriate pressure reduction to the refrigerant, and when the increase in the flow rate is detected by the detection means, the flow rate of the refrigerant is increased by the adjustment means.

In the absorption refrigerator of the present invention, when the flow rate of the refrigerant suddenly increases at the time of start-up or a sudden increase in the load, this is detected by the detecting means, and the condenser (11) is adjusted by the adjusting means. The flow rate of the refrigerant sent to the is increased. Thereby, the refrigerant flowing out of the low-temperature regenerator (12) flows to the condenser without interruption. After that, when the load becomes stable and enters a steady operation state, the flow rate of the refrigerant flowing out of the low-temperature regenerator (12) becomes constant, and the refrigerant is appropriately depressurized by the adjusting means.

In a specific construction, the detecting means comprises a refrigerant tank (9) interposed in a pipe (7) for supplying the refrigerant liquefied by the low-temperature regenerator (12) to the condenser (11). The change in the flow rate of the refrigerant can be detected based on the liquid level of the refrigerant in the refrigerant tank (9). The adjusting means is a refrigerant tank (9).
The inlet of the float valve (81) that opens and closes according to the liquid level in the inside is installed in the refrigerant tank (9) and the outlet is connected to the condenser (11), and the refrigerant tank (9) and the condenser (11) are connected. Connecting pipe (7)
And an orifice (71).

In the above-described specific configuration, when the flow rate of the refrigerant suddenly increases at startup or when the load suddenly increases, the liquid level of the refrigerant in the refrigerant tank (9) rises. Then, the float valve (81) is opened. As a result, the refrigerant flowing out of the low-temperature regenerator (12)
After accumulating in (9), it passes through the float valve (81) and passes through the condenser (1).
At the same time, the refrigerant is supplied from the outlet of the refrigerant tank (9) to the condenser (11) through the orifice (71). Thereby, a sufficient flow path from the low-temperature regenerator (12) to the condenser (11) is formed, and the refrigerant flowing out of the low-temperature regenerator (12) flows into the condenser (11) without being stopped. . Thereafter, when the load is stabilized and the steady operation state is established, the liquid level of the refrigerant in the refrigerant tank (9) decreases, and the float valve (81) closes. Therefore, the refrigerant accumulated in the refrigerant tank (9) is supplied from the outlet of the refrigerant tank (9) to the condenser (11) through only the pipe (7) without passing through the float valve (81). At this time, the refrigerant is appropriately decompressed by the orifice (71) in the pipe (7).

[0012]

In the absorption refrigerator according to the present invention,
Appropriate pressure reduction is applied to the refrigerant supplied from the low-temperature regenerator (12) to the condenser (11), so that the high-temperature regenerator (3) and the low-temperature regenerator (12) respectively As a result, a sufficient amount of steam generated according to the heat input is obtained, so that higher efficiency than before can be realized.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. The double-effect absorption refrigerator according to the present invention comprises an upper body (1) comprising a condenser (11) and a low-temperature regenerator (12), as in the conventional absorption refrigerator shown in FIG. Lower body (2) consisting of vessel (21) and absorber (22),
High temperature regenerator (3) with built-in burner (31), high temperature heat exchanger
(4) The low-temperature heat exchanger (5) and the like are connected to each other by pipes, and the absorbent is pumped by the absorbent pump (6) into the high-temperature regenerator (3), the low-temperature regenerator (12) and the absorber (22). The refrigeration cycle is realized by circulating between the refrigeration cycles. Burner (3) in high temperature regenerator (3)
A gas valve (32) is attached to a pipe for supplying a fuel gas to (1), and a gas valve (32) is provided to keep the temperature of the cold water flowing out of the evaporator (21) (the cold water outlet temperature Tc_out) at a target value. 32)
Is controlled, and the supply amount of the fuel gas is adjusted.

FIG. 1 shows a characteristic structure of an absorption refrigerator according to the present invention, and a first pipe () for supplying a refrigerant liquefied by a low-temperature regenerator (12) to a condenser (11). 7) A refrigerant tank (9) is interposed in the middle of the refrigerant tank (9).
An orifice (71) having a hole diameter that is appropriately large in a steady operation state is attached to the outlet side of the valve. A float valve (81) is installed in the refrigerant tank (9), and the inlet of the float valve (81) opens in the refrigerant in the refrigerant tank (9), and the outlet thereof is connected to the second pipe (8). ) Is connected to the upper body (1). When the float valve (81) is started up or when the load suddenly increases, the flow rate of the refrigerant flowing out of the low-temperature regenerator (12) sharply increases, and the liquid level of the refrigerant in the refrigerant tank (9) becomes a predetermined level. When the liquid level rises above the liquid level, the float (82) rises and becomes open, and thereafter the load becomes stable and becomes a steady operation state, and the flow rate of the refrigerant flowing out of the low-temperature regenerator (12) becomes constant. When the liquid level of the refrigerant in the refrigerant tank (9) falls below the predetermined liquid level, the refrigerant is closed as the float (82) is lowered.

Therefore, at the time of start-up or a sudden increase in load, the refrigerant flowing from the low-temperature regenerator (12) into the refrigerant tank (9) passes through the float valve (81) in the open state, and the second pipe ( It is supplied to the condenser (11) via 8) and is supplied to the condenser (11) via the first pipe (7). Due to the formation of these two flow paths, the refrigerant flowing out of the low-temperature regenerator (12) flows toward the condenser (11) without stagnation.

In the steady operation state, since the float valve (81) is closed, the refrigerant flowing out of the low temperature regenerator (12) cannot pass through the second pipe (8), After only (7), it is supplied to the condenser (11). Here, the first pipe
In (8), since the orifice (71) having an appropriate hole diameter is provided, the refrigerant is subjected to an appropriate amount of reduced pressure. As a result, in each of the high-temperature regenerator (3) and the low-temperature regenerator (12), a sufficient amount of steam generated in accordance with the amount of heat input to the high-temperature regenerator (3) can be obtained. Efficiency is realized.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, while monitoring the liquid level of the refrigerant tank (9) with a sensor, a control valve is attached to the first pipe (7), and the opening of the control valve is adjusted according to the liquid level of the refrigerant tank (9). A configuration can be employed. This makes it possible to omit the second pipe (8) and the float valve (81). Here, if a control valve having a pressure reducing function and a flow rate adjusting function is adopted, the orifice (71) can be omitted.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a configuration of a main part of an absorption refrigerator according to the present invention.

FIG. 2 is a system diagram showing an entire configuration of a double-effect absorption refrigerator.

FIG. 3 is a system diagram corresponding to FIG. 1 of a conventional absorption refrigerator.

[Explanation of symbols]

 (1) Upper body (11) Condenser (12) Low temperature regenerator (2) Lower body (21) Evaporator (22) Absorber (3) High temperature regenerator (7) First piping (71) Orifice (8) Second pipe (9) Refrigerant tank (81) Float valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Fujiwara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Toshihiro Yamada 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] The refrigerant vapor generated in the high-temperature regenerator (3) is supplied to the low-temperature regenerator (12) to be condensed, and the refrigerant liquefied by the condensation is supplied to the condenser (11) in a double effect type absorption. In the refrigerator, the refrigerant liquefied by the low-temperature regenerator (12)
A detecting means for detecting a change in the flow rate of the refrigerant flowing out of the low-temperature regenerator (12), and a condenser (11)
Adjusting means for adjusting the flow rate of the refrigerant fed into the refrigerant and applying an appropriate pressure reduction to the refrigerant, and when the increase in the flow rate is detected by the detection means, the flow rate of the refrigerant is increased by the adjustment means. refrigerator. The detecting means comprises a refrigerant tank (9) interposed in a pipe (7) for supplying the refrigerant liquefied by the low-temperature regenerator (12) to the condenser (11). The absorption refrigerator according to claim 1, wherein a change in the flow rate of the refrigerant is detected based on a liquid level of the refrigerant in the tank (9). 3. An adjusting means for connecting an inlet of a float valve (81) which opens and closes according to a liquid level in the refrigerant tank (9) to the refrigerant tank.
The orifice (71) is attached to a pipe (7) connecting the refrigerant tank (9) and the condenser (11), the outlet is connected to the condenser (11), and the outlet is connected to the condenser (11). 3. The absorption refrigerator according to 2.