JP2014092353A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swing-type accumulator that does not require a pipeline connection space on a side with a simple structure and at low costs.SOLUTION: The accumulator includes a tank body 2 comprising a cylindrical shell 3 whose upper end is opened, and a header 4 coupled to an opening of the shell. The header is provided with a refrigerant flow-in hole 8 and a refrigerant flow-out hole 9 opened in a vertical direction. An inner pipe 6 is coupled with the refrigerant flow-out hole, and an outer pipe 5 is arranged outside the inner pipe to form a double pipe. An introduction pipe 30 for emitting a refrigerant flowing in the vertical direction therefrom as a swirl flow in a direction along an inner periphery of the shell is coupled with the refrigerant flow-in hole. An emission port of the introduction pipe is positioned below an upper end of the outer pipe. An upper end 5a of the outer pipe is enlarged into a trumpet-like shape, and a trumpet-shaped part 5b may extend into contact with the inner periphery of the shell. Upper and lower parts of the trumpet-shaped part are communicated via an opening 5c formed at one part of the trumpet-shaped part.

Description

  The present invention relates to an accumulator of a type in which a refrigerant circulating in a refrigeration cycle is gas-liquid separated and stored.

  A receiver tank, an accumulator, or the like is used to separate and store the refrigerant or the like circulating through the refrigeration cycle. As this type of accumulator, for example, in Patent Document 1, a tank body including a body and a header, a refrigerant inflow hole formed in a side portion of the header, a refrigerant outflow hole formed in an upper portion of the header, and a refrigerant An accumulator is described that includes a centrifuge tube connected to an outflow hole, and a desiccant and the like housed in the body via a partition wall.

  In the accumulator, the refrigerant flowing from the refrigerant inflow hole flows toward the centrifugal separation tube to form a swirling flow, and is separated into a gas-phase refrigerant and a liquid-phase refrigerant containing oil by the action of centrifugal force. . The separated gas-phase refrigerant enters the centrifuge tube and is discharged from the refrigerant outflow hole.

  On the other hand, the liquid-phase refrigerant and oil descend in the fuselage and are stored at the bottom of the fuselage. At this time, the oil-water separation proceeds and the oil accumulates below the liquid-phase refrigerant. Further, when the liquid refrigerant and oil descend in the body, a part of moisture is absorbed by the desiccant. Further, the oil accumulated at the bottom of the body is sucked from the oil return hole and guided to the refrigerant outflow hole together with the gas phase refrigerant.

JP 2000-179996 A

  However, since the accumulator employs a so-called swirl type that forms a swirling flow in the refrigerant and performs gas-liquid separation of the refrigerant by its centrifugal force, a refrigerant inflow hole is formed on the side of the header. Yes. For this reason, there is a problem that a space for connecting a pipe or the like to the side of the header is required, and the handling of the pipe is complicated. In addition to this, there is also a problem that the accumulator becomes larger in order to obtain a swirling flow.

  In view of the above-described problems in the conventional technology, an object of the present invention is to provide a swivel accumulator that does not require a side pipe connection space and is easy to handle at a low cost with a simple configuration.

  In order to achieve the above object, an accumulator according to the present invention includes a tank body including a cylindrical body having an upper end opening and a header connected to the opening of the body, and the header has a longitudinal opening. A refrigerant inflow hole and a refrigerant outflow hole are connected, an inner pipe is connected to the refrigerant outflow hole, and an outer pipe is formed on the outside of the double pipe, and the refrigerant inflow hole is formed from there. An introduction pipe for ejecting the refrigerant flowing in the vertical direction as a swirling flow in a direction along the inner peripheral surface of the body is connected.

  According to the accumulator of the present invention, the refrigerant inflow hole is provided so as to open in the vertical direction in the same manner as the refrigerant outflow hole. In addition, by providing an introduction pipe that forms a swirling flow along the inner wall of the fuselage in the refrigerant that has flowed from the refrigerant inflow hole, it is possible to perform refrigerant gas-liquid separation by a swirling method with a simple configuration.

  In the accumulator, the outlet of the introduction pipe is positioned below the upper end of the outer pipe, so that the refrigerant flow from the introduction pipe is prevented from flowing directly into the upper end opening of the outer pipe, and the gas-liquid separation performance is improved. Further improvement can be achieved.

  In the accumulator, the upper end of the outer pipe can be enlarged in a trumpet shape. Thereby, it can prevent more reliably that the refrigerant | coolant flow from a conduit | pipe flows in directly into the upper end opening of an outer pipe, and can further improve gas-liquid separation performance.

  In the above accumulator, by extending the trumpet-shaped portion of the upper end portion of the outer pipe so as to contact the inner peripheral surface of the trunk, by communicating the top and bottom of the trumpet-shaped portion through an opening formed in a part thereof, The refrigerant flow from the introduction pipe is more reliably prevented from flowing directly into the upper end opening of the outer pipe, and the gas-liquid separation performance can be further improved.

  As described above, according to the present invention, there is no need for a side pipe connection space, which makes it possible to provide a swivel accumulator that excels in pipe connection workability and pipe handling at low cost. Become. In addition, the improvement of pipe handling and workability is an extremely significant advantage for in-vehicle devices whose work space is restricted.

It is a figure which shows 1st Embodiment of the accumulator which concerns on this invention, (a) is a longitudinal cross-sectional view, (b) is the sectional view on the AA line of (a). It is a figure which shows 2nd Embodiment of the accumulator which concerns on this invention, (a) is a longitudinal cross-sectional view, (b) is the BB sectional view taken on the line of (a).

  Next, preferred embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of an accumulator according to the present invention. This accumulator 1 includes a tank body 2 and internal machine parts such as an outer pipe 5, an inner pipe 6 and a bag 7 arranged in the tank body 2. Consists of.

  The tank body 2 includes a cylindrical body 3 having an upper end opening, and a header 4 which is welded to the body 3 via a welded portion 10 and connected to the opening of the body 3. The body 3 and the header 4 are both made of a metal such as an aluminum alloy.

  The header 4 has a refrigerant inflow hole 8 and a refrigerant outflow hole 9 that open in the vertical direction, and seals the opening end of the body 3. As shown in FIG. 1 (b), the header 4 is connected with an introduction pipe 30 that ejects the refrigerant flowing in the vertical direction from the refrigerant inflow hole 8 as a swirling flow in a direction along the inner peripheral surface of the body 3. By this introduction pipe 30, the mixed refrigerant (refrigerant in which the gas phase component and the liquid phase component are mixed) from the refrigerant inflow hole 8 is swung along the peripheral surface, and the liquid phase refrigerant and the compressor having high density are obtained by the action of centrifugal force. It is separated into oil (hereinafter referred to as “oil”) and a gas refrigerant having a low density.

  Inside the fuselage 3, an outer pipe 5 into which gas-liquid separated gas-phase refrigerant flows and an inner pipe 6 that guides the gas-phase refrigerant that has flowed into the outer pipe 5 to the refrigerant outlet hole 9 have a double-pipe structure. Be placed.

  The outer pipe 5 is made of synthetic resin, and is joined to the body 3 with the upper end portion 5a opened. A bag 7 containing a desiccant (hygroscopic agent) 7 a is accommodated in the lower part of the body 3, and adsorbs moisture and moisture in the liquid refrigerant in the body 3. Further, the upper end portion 5 a of the outer pipe 5 is enlarged in a trumpet shape to prevent the refrigerant flow from the conduit 30 from directly flowing into the upper end opening of the outer pipe 5.

  An intermediate portion of the outer pipe 5 is integrally formed with a flange portion 22 having a size that fits into the body 3. The flange portion 22 is provided with a reinforcing rib 22a that protrudes downward, and the flange portion 22 is provided with an opening window (not shown) that allows passage of the refrigerant so that the upper and lower spaces communicate with each other. .

  A pipe rib 23 that is in contact with the outer peripheral surface of the inner pipe 6 is integrally formed on the lower inner peripheral surface of the outer pipe 5. The bottom of the outer pipe 5 is provided with a strainer 20 in which a mesh member 21 made of metal or resin is insert-molded, and an oil return hole 24 that guides oil into the inner pipe 6.

  The inner pipe 6 is made of a metal such as an aluminum alloy, the lower end portion 6 a is opened, and the upper end portion 6 b is connected to the refrigerant outflow hole 9 of the header 4. Further, the lower part of the inner pipe 6 is fitted inside a pipe rib 23 projecting from the inner peripheral surface of the outer pipe 5, whereby the inner pipe 6 is stably held.

  Next, the operation of the accumulator 1 having the above configuration will be described with reference to FIG. In the following description, the accumulator 1 is disposed between the evaporator and the compressor of the refrigeration cycle, and moisture contained in the refrigerant from the evaporator is removed to generate a gas refrigerant, which is supplied to the compressor. The case of returning will be described as an example.

  The refrigerant discharged from the evaporator is returned to the accumulator 1 through a connection pipe (not shown). The refrigerant that has reached the accumulator 1 flows into the refrigerant inflow hole 8 of the header 4 and flows through the introduction pipe 30 that communicates with the refrigerant inflow hole 8. The refrigerant flowing into the introduction pipe 30 forms a swirling flow along the inner wall of the body 3 below the trumpet-shaped portion 5b of the outer pipe 5, and by the action of centrifugal force, a high-density liquid phase refrigerant and oil And separated into a low-density gas-phase refrigerant (gas refrigerant). Here, the trumpet-shaped portion 5b of the outer pipe 5 prevents the refrigerant flow from the introduction pipe 30 from directly flowing into the opening of the upper end portion 5a of the outer pipe 5, and can improve the gas-liquid separation performance. .

  The liquid-phase refrigerant and oil after gas-liquid separation descend in the body 3 due to their own weight and are stored in the bottom of the body 3. In the process, the separation of the liquid phase refrigerant and the oil proceeds, and the oil accumulates below the liquid phase refrigerant. The liquid refrigerant stored in the body 3 has reached a height position where the desiccant bag 7 is partially immersed or exceeded, and moisture and moisture in the refrigerant are adsorbed by the desiccant bag 7. .

  On the other hand, the gas-phase refrigerant after gas-liquid separation follows the trumpet-shaped portion 5 b of the outer pipe 5, flows into the outer pipe 5, and descends within the outer pipe 5. After that, it is folded at the bottom of the outer pipe 5 and flows into the inner pipe 6, rises in the inner pipe 6, and is guided to the refrigerant outflow hole 9. At this time, the oil accumulated at the bottom of the body 3 is removed by the strainer 20 through the oil return hole 24 and sucked, and guided to the refrigerant outflow hole 9 together with the gas-phase refrigerant. And the gaseous-phase refrigerant | coolant containing oil is discharged | emitted from the refrigerant | coolant outflow hole 9, and is conveyed to a compressor through connection piping (not shown).

  FIG. 2 shows a second embodiment of an accumulator according to the present invention. This accumulator 41 is different from the accumulator 1 shown in FIG. 1 only in the configuration of the outer pipe 5. Therefore, the configuration of the outer pipe 5 will be described below, and the other components are the same as those in FIG. 1, and thus the same reference numerals as those in FIG.

  The trumpet-shaped portion 5b of the outer pipe 5 extends so as to contact the inner peripheral surface of the body 3, and the trumpet-shaped portion 5b communicates with the top and bottom of the trumpet-shaped portion 5b through an opening 5c formed in a part thereof. Thereby, it is possible to more reliably avoid the refrigerant flow from the conduit 30 directly flowing into the opening of the upper end portion 5a of the outer pipe 5, and further improve the gas-liquid separation performance, and the presence of the opening portion 5c. The flow of the gas-phase refrigerant is not hindered.

  As described above, according to the present invention, since the refrigerant inflow hole 8 is provided in the upper part of the header 4 like the refrigerant outflow hole 9, a pipe connection space is not required on the side, so that the pipe connection work is facilitated. Become. This effect is an extremely great advantage for in-vehicle devices in which installation space and work space are restricted. Furthermore, since the structure which makes the refrigerant | coolant which flowed in from the refrigerant | coolant inflow hole 8 generate | occur | produces the swirl | flow flow along the inner wall of the fuselage | body 3 is employ | adopted, it can improve the gas-liquid separation performance of a refrigerant | coolant effectively, although it is a simple structure. it can.

DESCRIPTION OF SYMBOLS 1 Accumulator 2 Tank main body 3 Body 4 Header 5 Outer pipe 5a Upper end part 5b Trumpet-like part 5c Opening part 6 Inner pipe 6a Lower end part 6b Upper end part 7 Bag 7a Desiccant 8 Refrigerant inflow hole 9 Refrigerant outflow hole 10 Welding part 20 Strainer 21 Mesh member 22 ridge 22a rib 23 pipe rib 24 oil return hole 30 introduction pipe 30a spout 41 accumulator

Claims (4)

A tank body comprising a cylindrical body having an upper end opening and a header connected to the opening of the body;
The header is provided with a refrigerant inflow hole and a refrigerant outflow hole that open in the vertical direction,
An inner pipe is connected to the refrigerant outflow hole, and an outer pipe is arranged on the outside to form a double pipe,
An accumulator is connected to the refrigerant inflow hole. The accumulator is connected to the refrigerant inflow pipe through which a refrigerant flowing in the vertical direction is ejected as a swirling flow in a direction along the inner peripheral surface of the body. The accumulator according to claim 1, wherein the injection port of the introduction pipe is located below the upper end of the outer pipe. The accumulator according to claim 1 or 2, wherein an upper end of the outer pipe is enlarged in a trumpet shape. The trumpet-shaped portion extends so as to contact the inner peripheral surface of the body, and the trumpet-shaped portion communicates with each other through an opening formed in a part of the trumpet-shaped portion. 3. The accumulator according to 3.

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