JP2005127593A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accumulator capable of improving the reliability of a compressor and being miniaturized by returning only an evaporated gas of a compressed refrigerant to the compressor in the accumulator used for preventing the liquid compression of the compressor of a refrigeration cycle. <P>SOLUTION: As an opening and closing mechanism is mounted on an inlet part of a discharge pipe 4, the flowing of a large amount of liquid-phase refrigerant into the compressor can be prevented even when the liquid-phase refrigerant may be overflown, whereby the liquid compression can be prevented by a compact accumulator. Further the liquid compression is prevented by closing a return port to the compressor when a large amount of liquid refrigerant is returned into the accumulator, whereby a mechanism part in the compressor can be prevented from being damaged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an accumulator for a compressor, and more particularly to prevention of outflow of liquid refrigerant.

  In general, in the refrigeration cycle, as shown in FIG. 3, an accumulator is provided on the suction side of the compressor in order to prevent the compressor from sucking a liquid refrigerant (see, for example, Patent Document).

  As shown in FIG. 3, a conventional accumulator is connected to an upper portion of an accumulator 1 that constitutes a gas-liquid separation section 3 that separates the liquid phase of the refrigerant from a gas phase, and a compressor is connected to the lower portion of the accumulator 1. A discharge pipe 4 for discharging a gas-phase refrigerant connected to the suction side of the gas is provided so as to protrude into the gas-liquid separation unit 3, and the discharge pipe 4 has a flow hole 5 through which a small amount of liquid-phase refrigerant passes. The accumulator 1 is configured by providing a partition plate 9 provided between the inflow pipe 2 and the discharge pipe 4.

The compressed refrigerant evaporated in the evaporator of the refrigeration cycle enters the upper part of the gas-liquid separation part 3 from the inflow pipe 2 and enters the lower gas-liquid separation part 3 through the hole 10 of the partition plate. Evaporates and returns to the compressor through the discharge pipe 4.
JP-A-5-256260

  However, in the accumulator 1 having such a structure, when the refrigerant containing a large amount of liquid refrigerant returns from the inflow pipe 2 to the gas-liquid separation unit 3, the accumulator 1 exceeds the entrance of the discharge pipe 4 (hereinafter referred to as overflow). Then, since the liquid-phase refrigerant returns to the compressor at once, it becomes liquid compression and damages the mechanical portion of the compressor.

  Therefore, a large accumulator was attached to prevent overflow from occurring in any case of the refrigeration cycle.

  However, when operating the refrigeration cycle, in the stable state, there is almost no liquid phase refrigerant accumulated in the accumulator, and especially when it overflows, it is accumulated just before the end of the defrosting operation or when it is restarted. There is only a short time. Due to the overflow that occurs in such a short time, the liquid compression of the compressor cannot be prevented, thereby impairing the reliability of the compressor and incurring a large loss in terms of cost and space of attaching a large accumulator.

  In view of the above problems, the present invention improves the reliability of the compressor by returning only the evaporated gas of the refrigerant to be compressed to the compressor inside the accumulator used for preventing liquid compression of the compressor of the refrigeration cycle, and reducing the size of the compressor. An object is to provide an accumulator that can do this.

In order to solve the above problems, an accumulator according to the present invention is attached to a suction port side of a compressor constituting a refrigeration cycle, and gas-liquid separation for separating a refrigerant to be compressed from a liquid inflow pipe 2 and a refrigerant to be compressed into a gas phase. Part 3, a discharge pipe 4 for discharging a gas-phase refrigerant, a refrigerant flow hole 5 communicating with the gas-liquid separation part 3 and the discharge pipe 4, and an opening / closing mechanism provided at the entrance of the discharge pipe 4. .

  Such a configuration prevents the compressor from sucking a large amount of the liquid phase refrigerant when the liquid phase refrigerant is likely to overflow.

  The accumulator 1 of the present invention is attached to the suction port side of the compressor, and discharges the gas-phase refrigerant, the gas-liquid separation unit 3 that separates the refrigerant to be compressed and the refrigerant to be compressed from the liquid phase and the gas phase. By having the discharge pipe 4, the gas-liquid separator 3 and the refrigerant circulation hole 5 communicating with the discharge pipe 4, and the opening / closing mechanism provided at the entrance of the discharge pipe 4, a large amount of liquid phase refrigerant is likely to overflow. Provided is an accumulator capable of preventing liquid compression with a small accumulator and preventing the liquid accumulator from flowing into the compressor, thereby preventing liquid compression with a small accumulator and improving its reliability. Can do.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of an accumulator 1 according to Embodiment 1 of the present invention, in which a refrigerant inflow pipe 2, a gas-liquid separation unit 3 that separates a refrigerant to be compressed from a liquid phase and a gas phase, and a gas phase refrigerant. A discharge pipe 4 for discharging, and a refrigerant flow hole 5 through which a small amount of liquid-phase refrigerant that communicates with the gas-liquid separator 3 and the discharge pipe 4 are provided.

  At the entrance of the discharge pipe 4, the float 6 is held in a positional relationship such that the entrance of the discharge pipe 4 is closed immediately before the liquid level rises and overflows.

(Embodiment 2)
FIG. 2 is a configuration diagram of an accumulator 1 according to Embodiment 2 of the present invention, in which a refrigerant inflow pipe 2, a gas-liquid separation unit 3 that separates a compressed refrigerant to be sucked into a liquid phase and a gas phase, and a gas phase refrigerant. A discharge pipe 4 for discharging, and a refrigerant flow hole 5 through which a small amount of liquid-phase refrigerant that communicates with the gas-liquid separator 3 and the discharge pipe 4 are provided.

  A mesh 8 is attached to the entrance portion of the discharge pipe 4, and a float 6 is provided in the mesh 8, and is placed in a positional relationship such that the entrance of the discharge pipe 4 is closed immediately before the liquid level rises and overflows.

  In the accumulator 1 configured as described above, the operation will be described. When the liquid phase of the refrigerant normally flowing into the accumulator 1 is low, the liquid refrigerant that accumulates in the gas-liquid separation unit 3 is small and the float 6 is lowered. (Shown with a broken line).

  Since the float 6 is away from the entrance of the discharge pipe 4, there is a space 7 at the entrance of the discharge pipe 4, and the refrigerant flows through the space 7 through the space 7.

  However, when the liquid phase ratio of the refrigerant flowing into the accumulator 1 is high just before the end of the defrosting operation or immediately after restarting, the liquid refrigerant that accumulates in the gas-liquid separation unit 3 is large and the liquid level rises. And float 6 comes up. When the liquid level further rises and overflows, the float 6 rising at the entrance of the drain pipe 4 closes. The liquid refrigerant gradually returns from the flow hole 5 of the drain pipe 4 to the compressor.

When the refrigerant that has flowed little by little is conveyed to the condenser or evaporator of the refrigeration cycle, the accumulator 1
The liquid refrigerant is reduced, the liquid level is lowered, the float 6 is lowered, the entrance of the drain pipe 4 is opened, and the refrigerant flows as usual.

  When the liquid is likely to overflow in this way, the refrigerant having a low liquid refrigerant ratio flows into the compressor, so that it is possible to avoid damage to the mechanism portion.

  As described above, the accumulator according to the present invention is useful for preventing the compressor in the refrigeration cycle from sucking the liquid refrigerant.

Configuration diagram of an accumulator in Embodiment 1 of the present invention Configuration diagram of accumulator in embodiment 2 of the present invention Configuration diagram of conventional accumulator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Accumulator 2 Inflow pipe 3 Gas-liquid separation part 4 Drain pipe 5 Liquid return circulation hole 6 Float 7 Space 8 Mesh 9 Partition plate 10 Partition plate hole

Claims (2)

 A separation unit that is attached to a suction port side of a compressor constituting the refrigeration cycle and separates a refrigerant inflow pipe and a compressed refrigerant to be sucked into a liquid phase and a gas phase, and a discharge pipe and a separation unit that discharge a gas phase refrigerant. An accumulator for a compressor having a refrigerant circulation hole communicating with a discharge pipe, and an opening / closing mechanism for moving up and down a float provided at an inlet of the discharge pipe. A separation unit that is attached to a suction port side of a compressor constituting the refrigeration cycle and separates a refrigerant inflow pipe and a compressed refrigerant to be sucked into a liquid phase and a gas phase, and a discharge pipe and a separation unit that discharge a gas phase refrigerant. An accumulator for a compressor having a refrigerant circulation hole communicating with a discharge pipe, an opening portion of the discharge pipe being covered with a mesh, and an opening / closing mechanism for raising and lowering a float.

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