JPH0432660A - Refrigeration arrangement - Google Patents

Abstract

PURPOSE:To manufacture the title arrangement at a low cost by making simple the structure thereof even a small type, by a method wherein a first stop valve is connected to a high pressure part in the refrigerant circuit of a refrigeration machine, and both a second stop valve and a throttle mechanism are connected to a low pressure part therein. CONSTITUTION:A first stop valve 5 is conected to a high pressure-refrigerant circuit part 91 on the way led to an expansion valve 3 through a condenser 2, and a throttle valve 8 is connected to a low pressure-refrigerant circuit part 92 returned to a compressor 1 through an evaporator 4. When the refrigeration capacity is decreased, the stop valve 5 is opened in the condition under which a stop valve 7 is closed. In the high pressure-refrigerant circuit part 91, a high pressure-refrigerant vaporized or a high pressure-refrigerant liquefied is stored in a refrigerant-holding tank 6 through the stop valve 5. When the refrigeration capacity is increased, the stop valve 7 is opened in the condition under which the stop valve 5 is closed. The refrigerant in the tank 6 flows into a low pressure-refrigerant circuit part 92 through the throttle valve 8, and the amount of the refrigerant circulated in the circuit of a refrigeration machine is increased, and thus the refrigeration capacity is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration system that can be used in air conditioners, various environmental test equipment, and the like.

[Conventional technology]

A typical example of this type of refrigeration equipment is known to have a refrigeration machine that compresses refrigerant in a compressor, condenses it in a condenser, guides it to an evaporator via an expansion mechanism, and returns it to the compressor again. .

In this type of refrigeration equipment, capacity control for adjusting its refrigeration capacity has conventionally been generally performed in the following manner.

■ Control of the degree of throttling of the expansion mechanism in front of the evaporator ■ Control of compressor rotation speed, number of cylinders, etc. ■ High and low pressure bypass/unload ■ Parallel operation of multiple refrigerators [Problem to be solved by the invention] However, the above-mentioned According to the control method, when the refrigeration equipment is small, the structure becomes complicated and the cost increases, which tends to lose the characteristics of the small refrigeration equipment, which should originally have a simple structure and be provided at low cost. .

Therefore, the present invention provides a refrigeration system that can easily adjust the refrigeration capacity, while suppressing the complexity of the structure and increase in manufacturing costs, and that can exhibit the features of the compact size even when manufactured in a small size. The task is to provide equipment.

[Means for Solving the Problems] As a result of research to solve the above problems, the present inventor found that if the amount of refrigerant sealed in the refrigeration circuit could be changed, the degree of dryness of the refrigerant at the inlet of the expansion mechanism (degree of flash gas state) could be reduced. The ability to adjust the amount of refrigerant in the refrigeration circuit, thereby increasing or decreasing the refrigerating capacity, and the ability to change the amount of refrigerant sealed in the refrigeration circuit means that refrigerant can be replenished when the amount of refrigerant in the circuit decreases due to leakage. With this in mind, the present invention was completed.

That is, in order to solve the above-mentioned problems, the present invention provides a refrigeration system having a refrigeration machine that compresses refrigerant in a compressor, condenses it in a condenser, guides it to an evaporator via an expansion mechanism, and returns it to the compressor. The first stop of the refrigerant filling amount adjustment section that includes a storage tank, a first stop valve connected to the inlet side of the tank, a second stop valve connected to the outlet side of the tank, and a throttle mechanism. A refrigeration system characterized in that a valve side is connected to a high pressure side refrigerant circuit part of the refrigerator circuit, and a side of the second stop valve and a throttle mechanism is connected to a low pressure side refrigerant circuit part of the refrigerator circuit. It provides:

The expansion mechanism includes a capillary tube, an expansion valve, etc., and the throttle mechanism includes a capillary tube, an expansion valve, etc.
There are throttle valves, etc.

[For production]

According to the refrigeration system of the present invention, the high-pressure refrigerant gas or high-pressure refrigerant condensate flowing through the high-pressure side refrigerant circuit portion of the refrigeration circuit is stored in the refrigerant storage tank by opening the first stop valve in the refrigerant filling amount adjustment section. I can do it. As a result, the amount of refrigerant circulating in the refrigerator circuit is reduced, and the refrigerating capacity can be reduced.

On the other hand, the refrigerating capacity can be increased by opening the second stop valve in the refrigerant filling amount adjustment section and returning the refrigerant stored in the refrigerant storage tank to the low-pressure side refrigerant circuit portion of the refrigerator circuit.

Furthermore, when the amount of refrigerant in the refrigerant circuit decreases due to leakage, the second stop valve is opened to return the refrigerant stored in the refrigerant storage tank to the low-pressure side refrigerant circuit.
Refrigerant can be replenished.

[Embodiment] FIG. 1 shows a schematic configuration of an embodiment. This embodiment consists of one refrigerator: compressor 1, condenser 2,
An expansion valve 3 and an evaporator 4 are sequentially connected by piping.

According to this refrigeration system, refrigerant is compressed in a compressor 1, condensed in a condenser 2, guided to an evaporator 4 via an expansion valve 3, and returned to the compressor 1 again.

This refrigeration apparatus further includes a refrigerant filling amount adjustment section A.

The refrigerant filling amount adjustment unit A is configured by sequentially connecting a first stop valve 5, a refrigerant storage tank 6, a second stop valve 7, and a throttle valve 8 through piping. The throttle valve 8 is connected to a high-pressure side refrigerant circuit section 91 on the way to the expansion valve 3 , and is connected to a low-pressure side refrigerant circuit section 92 that returns from the blowout device 4 to the compressor 1 .

During operation of the refrigeration system, stop valves 5 and 7 in regulating section A are both closed. However, when attempting to reduce the refrigeration capacity of the refrigeration system, the stop valve 5 is opened while the stop valve 7 remains closed. As a result, the high pressure side refrigerant circuit portion 91
From there, high-pressure refrigerant gas or high-pressure refrigerant condensate passes through a stop valve 5 and is stored in a refrigerant storage tank 6 . After storing enough refrigerant in the tank 6 to reduce the refrigerating capacity to a predetermined value, the stop valve 5 is closed.

When increasing the refrigerating capacity, the stop valve 7 is opened while the stop valve 5 is closed. As a result, the refrigerant in the tank 6 flows through the throttle valve 8.
The refrigerant flows into the low-pressure side refrigerant circuit portion 92 through the refrigerant, increasing the amount of refrigerant circulating in the refrigerator circuit and increasing the refrigerating capacity. When an amount of refrigerant sufficient to increase the desired refrigerating capacity is released, valve 7 is closed.

Note that even when the amount of refrigerant in the refrigerator circuit 9 decreases, the stop valve 7 can be opened to replenish the refrigerant in the tank 6 into the circuit.

The effects obtained by opening the stop valve 5 during operation of the refrigeration system, storing a portion of the refrigerant in the tank 6, and reducing the substantial amount of refrigerant enclosed are as follows.

1. Avoiding abnormal operating conditions during overload operation and high-pressure side pressure increase. 2. Preventing liquid from flooding into the compressor 1 during low loads. 3. Changing the dryness of the refrigerant at the expansion valve 3. control of refrigeration capacity.

In addition, when the stop valve 7 is opened to control the refrigeration capacity or when the operating state of the refrigeration circuit changes due to a leakage of refrigerant in the refrigeration circuit 9 and the refrigerant in the tank 6 is returned to the circuit 9, the refrigerant is The throttle valve 8 that passes through is used to control the amount of refrigerant returned per unit time from the tank 6, and is used to prevent overload operation of the compressor 1, prevent liquid from flowing into the compressor, and prevent liquid from flowing into the evaporator. It functions to prevent sudden changes in evaporation temperature in step 4.

The opening/closing control of the valves 5 and 7 for adjusting the refrigerating capacity of the refrigeration apparatus to a desired state by the refrigerant filling amount adjustment section A is as follows:
For example, you can do as follows.

(2) The pressure on the high pressure side is detected by a pressure sensor, and if the pressure exceeds a predetermined value, the amount of refrigerant in the tank 6 is increased, and if the pressure decreases, the amount of refrigerant in the tank 6 is controlled to be decreased.

(2) The temperature of the discharge pipe of the compressor 1 is detected by a temperature sensor, and if the temperature rises above a predetermined temperature, the amount of refrigerant in the tank 6 is increased, and if the temperature falls, the amount of refrigerant is decreased.

■ The degree of superheating of the refrigerant at the outlet of the evaporator 4 is detected by a temperature sensor and a pressure sensor, and this detected value is input to a separately provided temperature controller (not shown), and the amount of refrigerant in the tank 6 is determined while comparing the degree of heating. Control to increase or decrease.

Note that the present invention is not limited to the above embodiments,
Other embodiments can also be implemented.

For example, the connection order of the second stop valve 7 and the throttle valve 8 in the refrigerant filling amount adjustment section A may be reversed.

〔Effect of the invention〕

According to the refrigeration device of the present invention, the refrigerating capacity can be easily adjusted by the refrigerant filling amount adjustment section, and since the adjustment section has a simple structure, the complexity of the structure of the entire device and the increase in manufacturing costs are suppressed. It is possible to make use of the features of small size, such as being able to be manufactured in a small size, have a simple structure, and be provided at low cost.

Further, according to the refrigeration system of the present invention, even if the amount of refrigerant in the refrigeration circuit decreases due to leakage or the like, the insufficient refrigerant can be easily replenished.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention. l...Compressor 2... Condenser 3...Expansion valve 4... Evaporator A... Refrigerant filling amount adjustment part 5...first stop valve 6... Refrigerant storage tank 7...Second stop valve 8... Throttle valve 9... Refrigerator circuit 91...High pressure side refrigerant circuit part 92...Low pressure side refrigerant circuit part Applicant: Tahai Espenc Co., Ltd.

Claims (1)

[Claims] (1) After compressing the refrigerant with a compressor, it is condensed with a condenser,
A refrigeration system having a refrigeration machine that leads the refrigerant to the evaporator via an expansion mechanism and returns it to the compressor, comprising: a refrigerant storage tank; a first stop valve connected to the inlet side of the tank; and a first stop valve connected to the outlet side of the tank. The first stop valve side of the refrigerant filling amount adjusting unit, which is equipped with a second stop valve and a throttle mechanism, is connected to the high pressure side refrigerant circuit portion of the refrigerator circuit, and the second stop valve
A refrigeration system characterized in that a stop valve and a throttle mechanism side of the refrigeration system are connected to a low pressure side refrigerant circuit portion of the refrigeration machine circuit.