JPH09210509A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accumulator to simply manufacture an inlet pipe and an outlet pipe and reduce a manufacturing cost. SOLUTION: In an accumulator 11 having an inlet pipe and an outlet pipe for a refrigerant, the outlet pipe is extended in an accumulator 11 and has a first part 100 bent approximately in a Ushape. One end 100a of the first part 100 is fixed on the inner wall of the accumulator 11 and an expansion part 101 is formed at the other end 100b of the first part 100. A second part 102 extending through the wall part of the accumulator 11 is fitted in the expansion part 101.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the structure of an accumulator connected in a refrigerant circuit.

[0002]

2. Description of the Related Art Generally, a refrigerating device having a refrigerant circuit in which a compressor, an evaporator, a pressure reducing device, and a condenser are connected in sequence is known. In this type, a suction pipe of the compressor is generally connected to an accumulator to prevent liquid back to the compressor (for example, Japanese Utility Model Publication No. 5-39407).

[0003]

The accumulator generally has a refrigerant inlet pipe and an outlet pipe, the outlet pipe extending into the accumulator and having a first portion that bends in a generally U-shape. However, one end of the first portion is fixed to the inner wall of the accumulator, and the other end of the first portion is formed with a diametrically expanded portion. The second part is manufactured by silver brazing to the expanded portion of the first part, and the second part is silver brazing to the upper wall of the accumulator.

The accumulator manufactured in this way is
Since there are many places where the silver is brazed, there is a problem that the manufacturing is extremely difficult and the manufacturing cost increases.

Further, the inlet pipe of this accumulator has its end bent, for example, upward, and then the end edge of the end is processed along the inner wall of the accumulator so that the introduced refrigerant collides with the upper part of the inner wall of the accumulator. Therefore, it is common to promote gas-liquid separation. However, it is difficult to process the leading edge after bending the end portion upward, for example.
This also raises the problem of increased manufacturing cost.

Therefore, an object of the present invention is to provide an accumulator which can easily manufacture the inlet pipe and the outlet pipe and reduce the manufacturing cost.

[0007]

According to a first aspect of the invention, in an accumulator having a refrigerant inlet pipe and an outlet pipe, the outlet pipe extends into the accumulator and is bent in a substantially U-shape. The first portion has one end fixed to the inner wall of the accumulator, the other end of the first portion is formed with a pipe expanding portion, and the pipe expanding portion penetrates the wall of the accumulator. The second part to be fitted is fitted.

According to this, in the outlet pipe of the accumulator, the silver brazing work between the expanded diameter portion of the first portion and the second portion becomes unnecessary.

According to a second aspect of the present invention, in an accumulator having a refrigerant inlet pipe and an outlet pipe, the inlet pipe has a substantially circular end portion before processing, and the end portion has a predetermined curvature. By bending, the end after processing,
The shape is such that the refrigerant collides with the inner wall of the accumulator.

According to this, in the inlet pipe of the accumulator, by bending a pipe whose end portion is cut into a sliced state and bent with a predetermined curvature, the processed end portion is cooled along the inner wall of the accumulator. It becomes the shape to collide. Therefore, the manufacturing of the inlet pipe is facilitated and the manufacturing cost is reduced.

According to a third aspect of the present invention, in an accumulator having a refrigerant inlet pipe and an outlet pipe, the outlet pipe has a first portion extending into the accumulator and bent in a substantially U shape. , One end of the first portion is fixed to the inner wall of the accumulator, the expanded portion is formed at the other end of the first portion, the expanded portion has a second portion penetrating the wall portion of the accumulator. It is fitted and a gap is formed in the fitting portion between the expanded portion and the second portion. According to this, even when the liquid refrigerant is accumulated in the accumulator when the compressor is restarted, the gas refrigerant in the accumulator is also sucked together with the liquid refrigerant through the gap, so that the compressor is less likely to perform liquid compression.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 4, reference numeral 1 is an outdoor unit of the separation type air conditioner, and 2 is an indoor unit. The units 1 and 2 are connected by a pipe between the units to form a refrigerant circuit. This refrigerant circuit has an accumulator 11, a compressor 12, a four-way valve 13, an outdoor heat exchanger 14, an anti-icing coil 15, and the like on the outdoor unit 1 side, and electronic control on the indoor unit 2 side. It has a valve 16 and an indoor heat exchanger 17.

During the cooling operation, the four-way valve 13 is switched to the position shown, the refrigerant flows as shown by the solid arrow, the outdoor heat exchanger 14 acts as a condenser, and the indoor heat exchanger 17 is an evaporator. Acts as.

During the heating operation, the four-way valve 13 is switched to the position of the dotted line, the refrigerant flows as shown by the dotted arrow, the outdoor heat exchanger 14 functions as an evaporator, and the indoor heat exchanger 17 is the condenser. Acts as.

According to this embodiment, the structure of the accumulator 11 is characteristic.

As shown in FIGS. 1 to 3, the accumulator 11 has a bottomed cylindrical main body 21.
The opening 23 is covered with a cap 23. In the accumulator 11, as shown in FIG.
5 and an outlet pipe 27 are provided. The outlet pipe 27 extends into the body 21 of the accumulator 11 and has a first portion 100 that bends in a generally U-shape.
One end 100a of the accumulator 11 (cap 2
The stay 29 fixed to the inner wall of 3) is joined by silver brazing by spotting.

A pipe expanding portion 101 is formed at the other end 100b of the first portion 100, and a second portion 102 penetrating the wall portion of the accumulator 11 (cap 23) is not silver brazed in the pipe expanding portion 101. The second portion 102 is joined to the through hole of the cap 23 by silver brazing. Here, a groove 150 protruding in the vertical direction and outward is formed in the expanded pipe portions 101 and 102 (see FIG. 5).
), This groove 150 is the second part 1 with the tube expansion part 101.
The gap 200 between the two is 02.

According to this embodiment, the outlet pipe 27 has a conventional construction in that the second portion 102 is fitted to the expanded portion 101 of the first portion 100 without silver brazing. It is much simpler than the one.

If silver brazing is not applied to this portion, a gap 200 is formed between the expanded pipe portion 101 of the first portion 100 and the second portion 102, and the operation of the compressor is restarted through this gap 200. At times, the gas refrigerant in the accumulator 11 is sucked.

On the other hand, the refrigerant inlet pipe 25 is manufactured by bending the tip of a straight pipe upward. As shown in FIG. 1, the inlet pipe 25 penetrates the wall portion of the cap 23, extends into the upper space of the accumulator 11, and is silver brazed to the through hole of the cap 23. In manufacturing the inlet pipe 25, after the end portion of the straight pipe is cut into a substantially circular shape, the end portion 103 is bent with a predetermined curvature to thereby form the edge 10 of the processed end portion 103.
3a is formed to have a shape along which the refrigerant collides with the inner wall of the accumulator 11.

According to this, when manufacturing the inlet pipe 25, the straight pipe as a raw material only needs to have the end portion cut off, and the end portion 103 can be bent upward, for example. Since the end edge 103a is processed so as to substantially follow the inner wall of the accumulator 11, the processing is extremely simple, and the manufacturing cost of the accumulator 11 is significantly reduced as compared with the conventional one.

Next, the operation of this embodiment will be described.

Referring to FIG. 1, the refrigerant introduced into the accumulator 11 through the refrigerant inlet pipe 25 is at the end portion 10.
3 is discharged from the edge 103a, and the accumulator 11
It collides with the upper part of the inner wall of the (cap 23) almost accurately, and is separated into a gas refrigerant and a liquid refrigerant here. According to the shape of the edge 103a of the end portion 103, this gas-liquid separation is greatly promoted as compared with the conventional one. The liquid refrigerant separated into gas and liquid is collected in the lower part of the accumulator 11, and the gas refrigerant is collected in the upper part of the accumulator 11.

The gas refrigerant accumulated in the upper portion is led out of the accumulator 11 through the first portion 100 and the second portion 102 of the outlet pipe 27. Further, although the liquid refrigerant accumulates in the accumulator 12 due to the operation stop of the compressor 12, when the operation of the compressor 12 is restarted, the gas refrigerant in the upper part in the accumulator 12 and the above-mentioned liquid refrigerant are intervened via the gap 200. It is sucked into this compressor 12.

Therefore, the refrigerant returned to the compressor 12 is in a gas-liquid mixed state, and it is possible to reduce the possibility that the compressor 12 will be liquid-compressed and destroyed.

The present invention is not limited to the above-described embodiments, but can be variously modified without departing from the spirit of the present invention. For example, the bent shape of the end portion 103 of the inlet pipe 25 is not limited to the illustrated shape. In the present invention, it is important that the shape of the end edge 103a is formed so that the refrigerant discharged from the end edge 103a of the end portion 103 of the inlet pipe 25 collides with the shape of the inner wall of the accumulator 11.

Further, in the above-mentioned embodiment, the groove 15 is formed in the expanded pipe portion 101.
Although 0 is provided to form the gap 200, the outer diameter dimension of the second portion 102 can be set to the expanded portion 10 without providing such a groove.
It is also possible to make the outer diameter of 1 somewhat smaller and form a gap between the two.

[0029]

According to the first aspect of the invention, in the accumulator having the refrigerant inlet pipe and the refrigerant outlet pipe, the outlet pipe extends into the accumulator and is bent in a substantially U-shape. The first portion has one end fixed to the inner wall of the accumulator, the other end of the first portion has an enlarged diameter portion, and the enlarged diameter portion penetrates the wall portion of the accumulator. Since the second portion is fitted, the silver brazing work between the expanded portion of the first portion and the second portion is not necessary in the outlet pipe of the accumulator.

According to the second aspect of the present invention, in the accumulator having the refrigerant inlet pipe and the outlet pipe, the inlet pipe has an end portion which is substantially in a ring-shaped state before processing, and the end portion has a predetermined shape. By bending with a curvature, the end after processing forms a shape that causes the refrigerant to collide along the inner wall of the accumulator, so in the inlet pipe of the accumulator, a pipe whose end has been cut into a sliced state is predetermined. By bending with the curvature of, the processed end has a shape in which the refrigerant collides with the inner wall of the accumulator, so that the inlet pipe is easily manufactured and the manufacturing cost is reduced.

According to a third aspect of the present invention, in an accumulator having a refrigerant inlet pipe and a refrigerant outlet pipe, the outlet pipe has a first portion extending into the accumulator and having a substantially U-shaped bend. One end of the part is fixed to the inner wall of the accumulator, the expanded part is formed at the other end of the first part, and the expanded part is fitted with the second part penetrating the wall part of the accumulator. Moreover, a gap is formed in the fitting portion between the expanded portion and the second portion.
According to this, even when the liquid refrigerant is accumulated in the accumulator when the compressor is restarted, the gas refrigerant in the accumulator is also sucked together with the liquid refrigerant through the gap, so that the compressor is less likely to perform liquid compression.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view showing an embodiment of an accumulator according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is a transverse sectional view of the same.

FIG. 4 is a refrigerant circuit diagram of the same.

FIG. 5 is a sectional view taken along line VV of FIG. 1;

[Explanation of symbols]

 11 Accumulator 21 Main body 23 Cap 25 Inlet pipe 27 Outlet pipe 100 First part 100a One end 100b Other end 101 Expanded diameter part 102 Second part 103 End part 103a End edge 200 Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tamura ▲ Yoshi ▼ Hisa, Keihan Hon-dori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. (72) Hisashi Kogure Keihan-hondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An accumulator having a refrigerant inlet pipe and a refrigerant outlet pipe, wherein the outlet pipe has a first portion extending into the accumulator and having a substantially U-shaped bend. One end is fixed to the inner wall of the accumulator,
An accumulator characterized in that a pipe expanding portion is formed at the other end of the first portion, and a second portion penetrating a wall portion of the accumulator is fitted to the pipe expanding portion. 2. An accumulator having a refrigerant inlet pipe and an outlet pipe, wherein the end portion of the inlet pipe is in a substantially circular shape before processing, and the end portion after processing is bent by a predetermined curvature. The accumulator, wherein the end portion has a shape that causes a refrigerant to collide along an inner wall of the accumulator. 3. An accumulator having a refrigerant inlet pipe and a refrigerant outlet pipe, wherein the outlet pipe has a first portion extending into the accumulator and having a substantially U-shaped bend. One end is fixed to the inner wall of the accumulator,
A pipe expanding portion is formed at the other end of the first portion, a second portion penetrating the wall of the accumulator is fitted to the pipe expanding portion, and the pipe expanding portion and the second portion are fitted together. An accumulator characterized in that a gap is formed in the portion.