JPH08271093A - Refrigeration machine - Google Patents

Abstract

PURPOSE: To obtain a refrigeration machine where damages of a compressor due to liquid compression can be surely prevented. CONSTITUTION: In a refrigerant circuit of a refrigeration machine, first and second refrigerant accumulators 11 and 9 are arranged in series on the suction side of a compressor 2. The first refrigerant accumulator 11 is located nearer to the compressor, and the second refrigerant accumulator 9 is heated. Therefore, the liquid refrigerant is prevented from flowing into the compressor 2, so that liquid compression by the compressor 2 does not occur when operation is re-started after the compressor 2 is once stopped. In addition, as the second refrigerant accumulator 9 is heated, pulsations generated by the compressor 2 are buffered by the gas refrigerant in the second refrigerant accumulator 9, resulting in a smooth operation and a reduction of noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system in which a compressor discharges a refrigerant and circulates the refrigerant in a refrigerant circuit.

[0002]

2. Description of the Related Art Generally, a refrigerating circuit for a showcase refrigerating device or a refrigerating device such as an air conditioner has an accumulator,
It is composed of a compressor, a condenser, a pressure reducer, and an evaporator. The accumulator (refrigerant reservoir) is provided on the suction side of the compressor to separate the refrigerant into gas and liquid and prevent the liquid refrigerant from being taken into the compressor. This is to prevent damage to the compressor due to liquid compression.

However, a large amount of liquid refrigerant may accumulate in the accumulator due to load fluctuations and the like. Even in such a case, various proposals have heretofore been made to prevent the liquid refrigerant from being sucked into the compressor. Has been done.

For example, in the technique disclosed in Japanese Utility Model Publication No. 55-17081, two gas-liquid separators (refrigerant reservoirs) are provided in series, and a large amount of liquid cannot be covered by only one gas-liquid separator. A configuration has been proposed in which the liquid refrigerant does not directly flow into the compressor even when the refrigerant accumulates.

On the other hand, Japanese Utility Model Publication No. 53-51081 discloses a structure in which a refrigerant pipe is wound around the compressor in order to prevent noise from the compressor.

[0006]

However, in the former technique disclosed in Japanese Utility Model Publication No. 55-17081,
Even if two gas-liquid separators are provided, the capacity of each gas-liquid separator is limited due to the demand for downsizing of the device. Therefore, merely arranging the two gas-liquid separators in series cannot reliably prevent the inflow of the liquid refrigerant into the compressor, and the compressor may not be reliably prevented from being damaged by the liquid compression. . In particular, when the outside air temperature is low, the refrigerant is easily liquefied, so that the amount of liquid accumulated in the gas-liquid separator also increases.

Incidentally, the latter of the above-mentioned actual Kokoku Sho 53-5108
In Japanese Patent Laid-Open Publication No. 1-Gazette, since the refrigerant pipe is wound around the compressor only for the purpose of preventing noise, the refrigerant pipe does not have a function as a liquid reservoir and the inflow of the liquid refrigerant into the compressor cannot be prevented.

Therefore, an object of the present invention is to provide a refrigerating apparatus which can surely prevent damage to the compressor due to liquid compression.

[0009]

According to a first aspect of the present invention, there is provided a refrigeration system in which a refrigerant is discharged from a compressor to circulate the refrigerant in a refrigerant circuit, wherein the refrigerant circuit has a suction side of the compressor. From the side close to the compressor, the first refrigerant reservoir, the second
It is characterized in that they are arranged in series in the order of the refrigerant reservoirs to heat the second refrigerant reservoir.

According to a second aspect of the present invention, the second refrigerant reservoir is heated by the heat of the compressor.

According to a third aspect of the present invention, in a refrigeration system in which the refrigerant sucked from the suction side of the compressor through the refrigerant reservoir is discharged to circulate the refrigerant in the refrigerant circuit, the refrigerant reservoir is connected to the compressor. It is characterized by heating with heat.

[0012]

In the invention described in claim 1, when the compressor is stopped, the refrigerant in the refrigerant circuit is accumulated in the first refrigerant reservoir,
Subsequently, they are stored in the order of the second refrigerant storage. in this way,
Since the refrigerant is accumulated in order from the refrigerant reservoir on the side away from the compressor, the inflow of the liquid refrigerant into the compressor is prevented even if the amount of the liquid refrigerant increases due to load fluctuations or low outside air temperature.
Moreover, since the volume of the liquid refrigerant that can be stored can be dispersed in the two containers, each container can be made small and the degree of freedom of arrangement is great.

Further, at the time of re-operation after the stop, since the second refrigerant reservoir on the side remote from the compressor is heated to vaporize the stored liquid refrigerant, only the gaseous refrigerant is operated at the time of operation of the compressor. Supply to the compressor to prevent liquid compression by the compressor.

The second refrigerant reservoir farther from the compressor is heated because the liquid refrigerant when the refrigerant is stopped is stored in the second refrigerant reservoir farther from the compressor and overflows the liquid refrigerant. Is stored in the first refrigerant reservoir.

According to a second aspect of the present invention, in the refrigeration apparatus of the first aspect, the second refrigerant reservoir is heated by the heat of the compressor. Therefore, since the heat of the compressor is used, the second refrigerant reservoir can be heated with a simple structure without providing any heating means.

According to the third aspect of the present invention, since the refrigerant reservoir is heated by the heat of the compressor, the liquid stored in the refrigerant reservoir is positively vaporized by the heat, so only the gaseous refrigerant is used. Can be supplied to the compressor.

[0017]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show the main part of the refrigerating apparatus according to this embodiment. First, the overall structure of the refrigerating apparatus will be described with reference to FIG.

The refrigeration system 1 includes a compressor 2, a condenser 3, a decompressor 5, an evaporator 7, a second refrigerant reservoir 9 and a first refrigerant reservoir 11.
And are connected in series by a refrigerant pipe in this order to form a refrigeration cycle (refrigerant circuit).

As shown in FIG. 1, the compressor 2 is provided with the longitudinal axis thereof in the horizontal direction in this embodiment.
No. 0 is attached via a spring 13 to prevent noise due to vibration.

A first refrigerant reservoir 11 and a second refrigerant reservoir 9 are fixed to the body of the compressor 2. First refrigerant reservoir 11
Is an ordinary accumulator, as shown in FIG.
It is supported by the main body of the compressor 2 via a mounting bracket 15. As shown by the broken line in FIG. 1, a refrigerant inflow pipe 17 is connected to the upper side of the elongated container, and a refrigerant outflow pipe 19 is connected to the lower side of the first refrigerant reservoir 11. The refrigerant is introduced into the container from above. The gas refrigerant is taken in from the refrigerant outflow pipe 19 that opens at the upper part of the container and is discharged to the suction side of the compressor 2. In the present embodiment, the containers for storing the liquid refrigerant are dispersed in the two containers, the second refrigerant reservoir 9 and the first refrigerant reservoir 11, so that each container can be made small and the degree of freedom of arrangement can be increased. growing.

The second refrigerant reservoir 9 is formed in a flat shape along the shape of the peripheral surface of its main body, and is fixed in close contact with the main body of the compressor 2. With the configuration in which the second refrigerant reservoir 9 is closely attached to the compressor 2, the heat of the compressor 2 can be efficiently transferred to the second refrigerant reservoir 9 to be heated. Moreover, since the second refrigerant reservoir 9 is heated by using the heat of the compressor 2 without providing any heating means, the overall structure is simple.

Further, as shown in FIG. 2, the second refrigerant reservoir 9 is arranged by utilizing the dead space between the unit base 20 and the compressor 2, so that the space for the second refrigerant reservoir 9 is formed. The size of the entire device is reduced without the need for.

Next, the operation of this embodiment will be described.

During operation of the refrigerating apparatus 1, the refrigerant discharged from the compressor 2 is cooled by the condenser 3, as shown by the arrow in FIG.
Pressure reducer 5, evaporator 7, second refrigerant reservoir 9, first refrigerant reservoir 1
It flows through the refrigerant circuit in the order of 1.

When the compressor 2 is stopped or the like, the refrigerant in the refrigeration cycle is cooled by the outside air or the like to become a liquid refrigerant. The liquid refrigerant first flows into the second refrigerant reservoir 9 and then the second refrigerant. Only the liquid refrigerant that has overflowed from the reservoir 9 is supplied to the first refrigerant reservoir 11. In this way, of the two refrigerant reservoirs, the second refrigerant reservoir 9 on the side farther from the compressor is sequentially reserved so that the liquid refrigerant is prevented from flowing into the compressor 2. Therefore, even if the second refrigerant reservoir 9 on the side far from the compressor 2 may become full when the load variation is large or the amount of the refrigerant liquefied becomes larger than usual due to the outside air temperature becoming too low. Therefore, the first refrigerant reservoir 11 on the side close to the compressor 2 is not filled up first and the liquid refrigerant is not taken into the compressor. Further, since the first refrigerant reservoir 11 is hardly filled with the liquid refrigerant, it is possible to prevent the liquid refrigerant from returning from the suction side of the compressor 2 after the operation is stopped and the pressure in the refrigerant circuit is balanced.

On the other hand, when the refrigeration system is restarted after the stop,
The drive of the compressor 2 causes it to generate heat, and the heat of the compressor 2 heats the second refrigerant reservoir 9 closely attached thereto. The heat of the compressor 2 positively evaporates and vaporizes the liquid refrigerant stored in the second refrigerant reservoir 9. The gas refrigerant flows directly from the second refrigerant reservoir 9 to the compressor 2 via the first refrigerant reservoir.
Is supplied to the suction side of. Therefore, a large amount of liquid refrigerant
Also, even when the refrigerant is stored in the second refrigerant, only the gas refrigerant is supplied to the compressor 2 to prevent the liquid compression at the start of the operation.

During operation, the heat of the compressor 2 is transferred to the second refrigerant reservoir 9
Since the heat exchanged with the refrigerant stored in the second refrigerant storage 9
Not only heating but also cooling of the compressor 2 is attempted.

By heating the second refrigerant reservoir 9,
Since the refrigerant reservoir 9 contains a gas having a predetermined pressure,
In the refrigerant circuit, the gas refrigerant acts like a cushion,
The pulsation generated in the compressor 2 is buffered, smooth operation is achieved, and noise generated by the pulsation is reduced.

Next, another embodiment of the present invention will be described with reference to FIG. In the other embodiment shown in FIG. 4, only one refrigerant reservoir 9a is provided on the suction side of the compressor 2 and is different from the above-described embodiment in that only one refrigerant reservoir is provided. . The same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In this other embodiment, the refrigerant pipe (refrigerant flow pipe) 17 led out from the refrigerant reservoir 9 is directly connected to the suction port of the compressor 2.

Since the refrigerant reservoir 9 is provided in close contact with the compressor 2 and is heated by the heat of the compressor 2 as in the above-described embodiment, the liquid refrigerant in the refrigerant reservoir 9 is positively charged. Is vaporized, and only the gas refrigerant is supplied to the compressor 2, so that liquid compression of the compressor 2 can be reliably prevented, and
The pulsation of the compressor 2 can be buffered to achieve smooth operation and noise reduction.

Further, since the number of the refrigerant reservoirs 9a is one, the structure can be simpler than that of the above-mentioned embodiment.

The present invention is not limited to the above embodiment,
Various modifications can be made without departing from the scope of the present invention.

For example, when heating the second refrigerant reservoir, it may be heated by a heating means such as a coil, as long as the refrigerant in the second refrigerant reservoir is positively vaporized by heat. The liquid compression of the compressor can be prevented.

The type of the refrigerant used in the refrigerant circuit is not particularly limited, and in addition to a single refrigerant such as R22,
Even if a mixed refrigerant such as R32, R134a, and R125 is used, the same effect as that of the above-described embodiment can be obtained.
Moreover, when such mixed refrigerants having different boiling points are used, the liquid refrigerant hardly remains in the circuit during operation, so that the mixed composition of the refrigerants hardly changes.

[0037]

According to the invention described in claim 1, the first refrigerant reservoir and the second refrigerant reservoir are arranged in series from the side closer to the compressor on the suction side of the compressor, and the second refrigerant reservoir is heated. Therefore, when the compressor is stopped, it is possible to prevent the liquid refrigerant from flowing into the compressor and prevent damage to the compressor due to liquid compression.

Further, since the capacity for storing the liquid refrigerant is dispersed in the two containers, the degree of freedom in arranging the refrigerant reservoir is large, the dead space can be utilized, and the apparatus can be miniaturized.

Further, by heating the second refrigerant reservoir, the gas refrigerant in the container buffers the pulsation generated in the compressor, which enables smooth operation and noise reduction.

According to the second aspect of the invention, since the second refrigerant reservoir is heated by the heat of the compressor, the second refrigerant reservoir can be heated with a simple structure.

According to the invention described in claim 3, the refrigerating apparatus is 1
Since the structure has three refrigerant reservoirs and the refrigerant reservoir is heated by the heat of the compressor, the liquid refrigerant is positively vaporized in the refrigerant reservoir, so that damage to the compressor due to liquid compression can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of a refrigerating apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main portion shown in FIG.

FIG. 3 is a refrigerant circuit diagram of the refrigerating apparatus according to the embodiment of the present invention.

FIG. 4 is a front view showing a main part of a refrigerating apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 1 Refrigerator 2 Compressor 9 Second Refrigerant Reservoir 9a Refrigerant Reservoir 11 First Refrigerant Reservoir

Claims (3)

[Claims] 1. A refrigeration system in which a refrigerant is discharged from a compressor to circulate the refrigerant in a refrigerant circuit, wherein the refrigerant circuit has a first refrigerant reservoir on a suction side of the compressor from a side close to the compressor, A refrigerating apparatus comprising: two refrigerant reservoirs arranged in series in order to heat the second refrigerant reservoir. 2. The refrigerating apparatus according to claim 1, wherein the second refrigerant reservoir is heated by the heat of the compressor. 3. A refrigerating apparatus in which a refrigerant sucked from a suction side of a compressor through a refrigerant reservoir is discharged to circulate the refrigerant in a refrigerant circuit, wherein the refrigerant reservoir is heated by heat of the compressor. Refrigeration equipment to be.