JPH07332808A - Accumulator - Google Patents

Abstract

PURPOSE:To contrive the reduction of cost and the saving of space by providing a lid which opens and closes in conjunction with liquid level in order to prevent and lessen the return of liquid refrigerant to a compressor from an accumulator. CONSTITUTION:When the liquid level of refrigerant is low in an accumulator, the inlet opening of a discharging pipe 1 is not covered with a lid 4 due to the weight of a float 6. When a large amount of refrigerant is sent back into an accumulator to raise the liquid level to near the inlet opening of the discharging pipe 1, the float 6 rises by its buoyancy to cover its inlet opening with the lid 4. In the event of the liquid level exceeding the inlet opening of the discharging pipe 1, the liquid refrigerant is directly sucked into a compressor to cause a trouble. Although, in this case, the liquid refrigerant passes through a small hole 5 of the lid 4 and enters the discharging pipe 1, due to the throttling effect of the small hole 5, the liquid refrigerant is reduced in pressure and evaporates into a gas phase or gas-liquid two phase stream. In this way return of the liquid refrigerant into the compressor can be prevented and lessened, thereby ensuring cycle reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an accumulator used in a refrigeration cycle, and more particularly to a mechanism for preventing or mitigating liquid return from the accumulator to the compressor.

[0002]

2. Description of the Related Art In the prior art, the method of preventing the liquid from returning from the accumulator to the compressor is to provide the accumulator with a capacity commensurate with the amount of refrigerant filled, or to provide a cycle container such as another liquid tank with the capacity. It was dealt with by giving it capacity.

[0003]

The conventional invention requires a cycle container such as an accumulator or a liquid tank having a capacity corresponding to several tens% of the amount of refrigerant filled in the refrigeration cycle, which is a disadvantage in terms of cost. It was.

Further, the separator type air conditioner has a problem that the length of the refrigerant pipe is restricted due to the capacity limitation of the accumulator and the like.

In particular, in recent years, in multi-type air conditioners, which have been increasing in number, the cycle volume of accumulators and the like becomes very large due to the large amount of refrigerant enclosed, which not only poses a problem in terms of cost, but also in the outdoor unit. It was also a space issue.

An object of the present invention is to prevent and mitigate liquid return even when a cycle container such as an accumulator having a smaller capacity than the amount of refrigerant filled in a refrigeration cycle is used, thereby reducing cost and saving space. Especially.

[0007]

In order to achieve the above object, the present invention provides a J-shaped discharge pipe inlet inside an accumulator with a lid interlocking with a float that moves up and down depending on the liquid level. In addition, the lid was provided with a small hole for decompressing and evaporating the liquid refrigerant.

[0008]

When the liquid surface water level in the accumulator rises and approaches the height of the discharge pipe inlet inside the accumulator, the float rises and, in conjunction with this, the lid provided at the discharge pipe inlet is closed. As a result, when the liquid surface water level becomes higher than the discharge pipe inlet, the liquid is evaporated under reduced pressure through the small holes provided in the lid to become gas or gas-liquid two-phase flow, and liquid return is prevented or alleviated.

When the liquid level falls below the discharge pipe inlet,
The float goes down, the lid provided at the inlet of the discharge pipe opens,
It becomes a normal discharge pipe.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a three-sided view of the liquid return prevention mechanism of the present invention provided at the accumulator J-shaped discharge pipe inlet, and FIG. 2 is a sectional view of the entire accumulator having the liquid return prevention mechanism of FIG.

The lid 4 and the float 6 for the inlet of the discharge pipe in the figure are attached to the vicinity of the inlet of the J-shaped discharge pipe 1 by the mounting bracket 2 via the rotary shaft 3. A small hole 5 for drawing is formed in the lid 4.

When the liquid level of the refrigerant inside the accumulator is low, the weight of the float 6 prevents the lid 4 from covering the inlet of the discharge pipe 1 as shown by the solid line in the figure. However, when a large amount of the refrigerant returns to the accumulator and the liquid level rises near the inlet height of the discharge pipe 1, the buoyancy of the float 6 causes the float 6 to rise as indicated by the alternate long and short dash line in the figure. The lid 4 covers the inlet of the discharge pipe 1. If the liquid surface water level exceeds the inlet height of the discharge pipe 1, in the absence of the present invention, the liquid refrigerant is directly sucked into the compressor located downstream of the accumulator, which causes a failure of the compressor. However, in the case of the present invention, the liquid refrigerant enters the discharge pipe 1 through the small hole 5 provided in the lid 4, but due to the throttling effect of the small hole, the liquid refrigerant is decompressed and evaporated to gas, or It becomes a gas-liquid two-phase flow, which can prevent and mitigate liquid return to the compressor, and ensure cycle reliability.

Next, when the liquid level falls below the inlet of the discharge pipe 1 again, the float 6 is lowered by gravity, the lid 4 is opened, and the inlet of the discharge pipe 1 is in a normal suction state.

[0014]

According to the present invention, in a refrigeration cycle including an accumulator having a J-shaped discharge pipe, even when a cycle container such as an accumulator having a smaller capacity than the refrigerant filling amount in the cycle is used, Since liquid return to the compressor can be prevented or alleviated, cost reliability and space saving can be achieved while ensuring cycle reliability.

[Brief description of drawings]

FIG. 1 is an explanatory view of a liquid return prevention mechanism of the present invention provided at an inlet of an accumulator J-shaped discharge pipe.

FIG. 2 is a sectional view of an accumulator having the liquid return prevention mechanism of FIG.

[Explanation of symbols]

1 ... Discharge pipe, 2 ... Mounting bracket, 3 ... Rotating shaft, 4 ... Lid, 5 ...
Small hole, 6 ... Float.

Claims (1)

[Claims] 1. An accumulator having a J-shaped discharge pipe used in a refrigerating cycle, which has a lid that opens and closes in conjunction with a liquid level in order to prevent or mitigate refrigerant liquid return from the accumulator to the compressor. Accumulator characterized by that.