JPH03156265A - Refrigerating device - Google Patents

Abstract

PURPOSE:To prevent a fluid from flowing from an accumulator through an oil return piping to a suction piping and a compressor during the interruption of the compressor by locating the upper position of the accumulator downwardly of the position of the suction piping communicating with the compressor. CONSTITUTION:An accumulator 10 is located in its position of the upper part of its body downwardly from the position of a suction piping 6. Since the accumulator 10 is located also in the upper part of its body downwardly of the suction piping 6, a fluid 8 is prevented from flowing to a compressor 1 through the suction piping 6 and an oil return piping 7 even during the interruption of the compressor 1 for protection of the compressor.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a refrigeration system, and in particular, when the compressor is stopped, the liquid refrigerant in the accumulator is transferred to the compressor via the oil return pipe, and the compressor is restarted. This prevents liquid compression.

[Conventional technology]

Figure 2 is a refrigerant system diagram of a conventional refrigeration system. In Figure 3, (+) is the compressor, (2) is the condenser, (3) is the expansion valve, (4) is the evaporator, and (5) is the accumulator. The refrigeration cycle is formed by sequentially connecting the stiffened straws with piping. (6) is a suction pipe of the compressor (1), and (7) is an oil return pipe, which communicates the bottom of the accumulator (5) with the suction pipe (6) of the compressor (1).

(3) is a mixed liquid of refrigerant liquid and compressor lubricating oil stored in the accumulator (5).

Fig. 3 shows another conventional example, the basic configuration of which is the same as that of Fig. 2, except that the oil return pipe (7) inserted into the suction pipe (6) is decompressed. Orifice in mechanism (9)
It has been established.

Next, the operation will be explained.

The refrigerant compressed by the compressor (1) dissipates heat in the condenser (2) and becomes liquefied, then the pressure is reduced in the expansion valve (3), and the refrigerant absorbs heat in the evaporator (4) and is vaporized. )
Guided within. In the accumulator (5), the guided refrigerant is separated into gas and liquid, and the gas returns to the suction tongue compressor (1) through the suction pipe (6), and the above operation is repeated again.

On the other hand, the liquid accumulates at the bottom of the accumulator (5), follows the same path as the refrigerant, passes through the oil return pipe (7) together with the oil for lubricating the compressor that was separated in the accumulator (5), and goes through the suction pipe (7) in a V state. 6) and is sucked into the compressor (1).

An oil return arrangement t(7) is provided, the purpose of which is to return the lubricating oil released from the compressor () into the cycle together with the refrigerant during the compression process to the compressor (1). . By the way, as a method of returning oil from the accumulator (5) to the suction pipe (6) through the oil return pipe (7), as shown in Fig. 2, the potential energy of the oil and refrigerant accumulated in the accumulator (5) is used. As shown in Figure 3, an orifice (9) is provided in the suction pipe (6), and the pressure loss that occurs immediately after is used to increase the accumulator (5) by the pressure difference.
) There is a way to restore it.

[Problem to be solved by the invention]

Since the conventional oil return method is configured as described above, the refrigerant liquid and oil (8) accumulated in the accumulator (5)
If the height is higher than the suction pipe (6), the liquid (8) will pass through the oil return pipe (7) and transfer to the suction pipe (6) and compressor (1) while the compressor is stopped. However, when the compressor is restarted, a large amount of liquid flows into the compression section of the compressor, causing damage to the compressor (1) due to liquid compression.

This invention was made in order to solve the above-mentioned problems, and aims to provide a refrigeration system that can prevent liquid from moving from the accumulator through the oil return pipe to the suction pipe and the compressor while the compressor is stopped. With the goal.

[Means to solve the problem]

In the refrigeration system according to the present invention, the upper part of the accumulator is arranged below the position of the suction pipe communicating with the compressor.

[For production]

In the refrigeration system according to the present invention, since the position of the suction pipe is higher than the top of the accumulator,
Liquid migration to the compressor is prevented and the compressor is protected.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 00 is an accumulator in which the upper part of the main body is located further below the position of the suction pipe (6).

Note that the other configurations are the same as those of the prior art, so explanations will be omitted.

Next, the operation will be explained. Since the upper part of the main body of the accumulator OF) is located below the position of the suction pipe (6), even if the compressor (1) is stopped, the suction pipe (6) and oil return The liquid (8) is prevented from migrating through the pipe (7).

〔Effect of the invention〕

As described above, according to the present invention, since the upper part of the accumulator is arranged below the position of the suction pipe communicating with the compressor, there is an effect that the compressor can be protected.

[Brief explanation of the drawing]

Fig. i11 is a refrigerant system diagram showing a refrigeration system according to an embodiment of the present invention, and Figs. 2 and 3 are refrigerant system diagrams showing a conventional refrigeration system. In the figure, (1) is a "compressor," (2) is a condenser, and (3 is a "compressor."
) is an expansion valve, (4) is an evaporator, (5) is an accumulator, (6) is a suction pipe, (7) is an oil return pipe, and OQ is an accumulator. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A refrigeration system in which a compressor, a condenser, an expansion valve, an evaporator, and an accumulator are sequentially connected by piping to form a refrigeration cycle, and an oil return piping is provided to communicate the bottom of the accumulator with the suction piping of the compressor. A refrigeration system characterized in that an upper position of the accumulator is disposed below a position of the suction pipe communicating with the compressor.