JP2014202440A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accumulator which suppresses the occurrence of abnormal noise accompanied by the generation of air bubbles to the minimum and assembles drying agent at a low cost without deteriorating air-liquid separation property, in the accumulator provided with an air-liquid separation member.SOLUTION: An accumulator includes a tank main body 2 which comprises a cylindrical shell 3 having an upper end that is opened; and a header 4 connected to an opening part of the shell. Coolant inflow hole 8 and coolant outflow hole 9 which are opened in the longitudinal direction are disposed on the header, an inverted bowl-shaped air-liquid separation member 16 is arranged in proximity to the coolant inflow port, an inner pipe 6 stretched to the neighborhood of an inner bottom part of a shell is connected to the coolant outflow hole, an outer pipe 5 is arranged so as to form a double pipe on the outer side of the inner pipe, a drying agent bag 7 is wound and fastened onto an outer pipe via a binding band 30 on the lower side position of the air-liquid separation member, and a pair of flange parts 5b, 5c which store and partition the drying agent bag are integrally disposed on the outer pipe.

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 circulating in the refrigeration cycle. As this type of accumulator, Patent Document 1 discloses that a refrigerant that has flowed into a housing from a refrigerant inlet collides with a cap portion as a gas-liquid separation member and gas phase refrigerant and a liquid phase refrigerant containing oil. An accumulator is described in which the separated gas-phase refrigerant enters the pipe section and is discharged from the outlet port.

  Further, in Patent Document 2, a bottle-shaped body having an upper end opened, a main body (header) in which an opening end of the body is sealed and a refrigerant inflow hole and a refrigerant outflow hole are formed, and a lower body are arranged. The refrigerant flowing into the main body from the refrigerant inflow hole of the main body is converted into a swirling flow in the swirling portion, and the liquid refrigerant and the gas refrigerant are separated by centrifugal separation using the swirling flow. And an accumulator that is separated.

Japanese Utility Model Publication No. 57-2371 JP 2011-21773 A

  In the swivel type accumulator described in Patent Document 2, there is no particular problem. However, as described in Patent Document 1, gas-liquid separation is performed below the header in which the refrigerant inflow hole and the refrigerant outflow hole are formed. In the accumulator in which the member exists, there is a problem that bubbles are generated when the desiccant comes into contact with the liquid-phase refrigerant accumulated in the lower part of the fuselage, and the bubbles collide with the gas-liquid separation member to generate a large noise. .

  Therefore, in view of the problems in the prior art, the present invention minimizes the generation of abnormal noise accompanying the generation of bubbles in an accumulator provided with a gas-liquid separation member, and does not deteriorate gas-liquid separation. The purpose is to assemble the desiccant at low cost.

  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 opens in a vertical direction. A refrigerant inflow hole and a refrigerant outflow hole are provided, and an inverted saddle-shaped gas-liquid separation member is disposed in the vicinity of the refrigerant inflow hole, and an inner portion extending near the inner bottom of the fuselage is disposed in the refrigerant outflow hole. A pipe is connected, and an outer pipe is arranged on the outer side so as to form a double pipe. A desiccant bag is wound and fixed to the outer pipe via a binding band at a position below the gas-liquid separation member. The outer pipe is integrally provided with a pair of collar portions for accommodating the desiccant bag.

  According to the present invention, since the desiccant-containing bag is disposed at an upper position close to the gas-liquid separation member, the ratio of the liquid-phase refrigerant stored in the body to come into contact with the desiccant is reduced, and the generation of bubbles is accordingly reduced. , Noise due to bubble generation is reduced. In addition, the desiccant bag can be assembled at low cost without deteriorating the gas-liquid separability by accommodating and partitioning the desiccant bag in a pair of brim parts and winding and fixing it on the outer pipe with a binding band.

  The outer pipe is integrally formed with positioning means for preventing displacement of the binding band.

  A plate-like member for preventing the desiccant bag from rotating is integrally formed on the outer pipe.

  As described above, according to the present invention, in the accumulator of the type in which the refrigerant inflow hole and the refrigerant outflow hole are opened above the header and the inflowing refrigerant collides with the gas-liquid separation member from above, the generation of abnormal noise is minimized. The desiccant can be assembled at a low cost without reducing the gas-liquid separation property.

It is a longitudinal section showing a 1st embodiment of an accumulator concerning the present invention. It is AA sectional view taken on the line of FIG. 1A. It is a front view which shows the outer pipe of the accumulator of FIG. 1A. It is a BB line sectional view of Drawing 2A. It is CC sectional view taken on the line of FIG. 2A. It is a perspective view which shows the other example of the attachment structure of the binding band to an outer pipe. It is a perspective view which shows the other example of the attachment structure of the binding band to an outer pipe. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the accumulator concerning this invention. It is the DD sectional view taken on the line of FIG. 5A. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the accumulator concerning this invention. It is the EE sectional view taken on the line of FIG. 6A.

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

  1A and 1B show a first embodiment of an accumulator according to the present invention. The accumulator 1 includes a tank body 2 including a body 3 and a header 4, and an outer pipe 5 disposed in the tank body 2. , Inner pipe 6, and internal machine parts such as a bag 7 containing a desiccant (hygroscopic agent) 7 a.

  The tank body 2 includes a bottomed cylindrical body 3 having an open upper end, and a header 4 that is welded to the body 3 via a welded portion 10 to seal the opening end 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 is formed in a circular shape when viewed from above, and the refrigerant inflow hole 8 and the refrigerant outflow hole 9 open upward. The refrigerant outflow hole 9 communicates with the inner pipe 6.

  Below the header 4, the mixed refrigerant (refrigerant in which the gas phase component and the liquid phase component are mixed) from the refrigerant inflow hole 8 is mixed with the high-density liquid phase refrigerant and compressor oil (hereinafter referred to as “oil”) and the density. A gas-liquid separation member 16 that separates into a low-temperature gas-phase refrigerant is provided in an inverted bowl shape.

  Inside the body 3, an outer pipe 5 into which the gas-liquid separated gas-liquid 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 are disposed. The outer pipe 5 and the inner pipe 6 are arranged so as to form a double pipe.

  The outer pipe 5 is made of synthetic resin, and as shown in FIGS. 2A to 2C, a pair of upper and lower collar portions 5b and 5c, a plate-like member 5d, and positioning protrusions 5e are formed on a cylindrical main body 5a. It is integrally formed. The pair of collar portions 5b, 5c accommodates the bag 7.

  The upper collar 5b is formed in a T shape when viewed from above. The lower collar portion 5c has an arcuate peripheral surface as viewed from above, and a plurality of openings 5f are formed. A plate-like member 5d extends in the vertical direction between the upper collar portion 5b and the lower collar portion 5c. The front end 5g of the plate-like member 5d is rounded so as not to damage the bag 7.

  As shown in FIG. 1A, the outer pipe 5 is fitted into the body 3 with the upper end 5h open. A strainer 20 in which a mesh member 21 made of metal or resin is insert-molded is provided at the bottom of the outer pipe 5, and this strainer is placed on the inner bottom surface of the body 3.

  The inner pipe 6 is made of a metal such as an aluminum alloy, extends to the vicinity of the inner bottom of the body 3, opens at the lower end, and connects the upper end 6 a to the refrigerant outflow hole 9 of the header 4. The lower part of the inner pipe 6 is fitted inside a pipe rib (not shown) formed on the inner peripheral surface of the outer pipe 5, whereby the inner pipe 6 is stably held.

  The bag 7 is disposed in a space between the upper collar portion 5b and the lower collar portion 5c of the outer pipe 5. The bag 7 is fixed to the outer pipe 5 via a cable tie-like binding band 30. The binding band 30 is held between the pair of positioning protrusions 5e of the outer pipe 5, and the positional displacement of the binding band 30 is prevented.

  Next, the operation of the accumulator 1 having the above configuration will be described with reference to FIGS. 1A and 1B. 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 sent to the accumulator 1 through a connection pipe (not shown). The refrigerant that has reached the accumulator 1 flows into the fuselage 3 from the refrigerant inflow hole 8, then collides with the gas-liquid separation member 16, and is separated into a liquid-phase refrigerant and oil and a lighter gas-phase refrigerant (gas refrigerant). Is done.

  The liquid-phase refrigerant and oil after the gas-liquid separation are stored in the body 3 by their own weight. In the process, the separation of the liquid phase refrigerant and the oil proceeds, and the oil accumulates below the liquid phase refrigerant. At this time, the liquid level of the liquid refrigerant reaches a height position where a part (substantially center) of the bag 7 is immersed. Accordingly, both the moisture contained in the liquid phase refrigerant and the moisture contained in the gas phase refrigerant are absorbed by the desiccant 7a.

  Since the bag 7 containing the desiccant 7a is arranged at an upper position close to the gas-liquid separation member 16, the ratio of the liquid-phase refrigerant stored in the body 3 to be in contact with the desiccant 7a is reduced, and the generation of bubbles is accordingly reduced. Abnormal noise associated with bubble generation is reduced. Further, even if bubbles are generated, the distance from the bubble generation position to the gas-liquid separation member 16 is short, so that it is avoided that the bubbles collide with the gas-liquid separation member 16 vigorously. The occurrence of abnormal noise is significantly reduced.

  On the other hand, the gas-phase separated gas-liquid refrigerant flows in from the upper end opening of the outer pipe 5 and descends in the outer pipe 5. After that, it is folded at the bottom of the outer pipe 5 and flows into the inner pipe 6. At this time, the oil accumulated at the bottom of the body 3 is sucked through an oil return hole (not shown), and becomes a gas-phase refrigerant richly containing oil components, which is connected to a connection pipe (not shown) from the refrigerant outflow hole 9. ) To be supplied to the compressor.

  FIG. 3 shows another example of a structure for attaching the binding band 30 to the outer pipe 5. In this example, a plate-like positioning protrusion 5j is provided on the outer peripheral surface of the outer pipe 5 so as to extend in the vertical direction, and the binding band 30 is inserted into a slit formed in the positioning protrusion 5j so that the binding band 30 is displaced. To prevent. In addition, since the positioning protrusion 5j is provided so as to extend in the vertical direction, it functions also as a reinforcing member that increases the mechanical strength of the outer pipe 5.

  FIG. 4 shows another example of a structure for attaching the binding band 30 to the outer pipe 5. In this example, a positioning notch 5n is formed in a plate-like portion 5m extending in the vertical direction on the outer peripheral surface of the outer pipe 5, and the binding band 30 is positioned in the notch 5n to prevent the binding band 30 from being displaced. To do. Further, the mechanical strength of the outer pipe 5 can be increased by the plate-like portion 5m extending in the vertical direction on the outer peripheral surface.

  Next, a second embodiment of the accumulator according to the present invention will be described with reference to FIGS. 5A and 5B. This accumulator 41 uses a hook-and-loop fastener 42 as a binding band instead of the binding band 30. Since other components are the same as those of the accumulator 1, the same components are denoted by the same reference numerals and description thereof will be omitted.

  A bag 7 containing a desiccant (hygroscopic agent) 7 a is disposed in a space between the upper collar portion 5 b and the lower collar portion 5 c of the outer pipe 5, and is fixed to the outer pipe 5 via a hook-and-loop fastener 42. Since the hook-and-loop fastener 42 is gently engaged with the surface of the bag 7 made of felt, a structure for preventing the positional fastener 42 from being displaced is unnecessary.

  Next, a third embodiment of the accumulator according to the present invention will be described with reference to FIGS. 6A and 6B. The accumulator 61 uses a metal clip 62 as a binding band instead of the binding band 30 and the hook-and-loop fastener 42. Since the other components are the same as those of the accumulator 1 and the like, the same components are denoted by the same reference numerals and description thereof will be omitted.

  A bag 7 containing a desiccant (hygroscopic agent) 7 a is disposed in a space between the upper collar portion 5 b and the lower collar portion 5 c of the outer pipe 5, and is fixed to the outer pipe 5 via a clip 62. The clip 62 is obtained by processing a strip-shaped metal plate. A bent portion 62b is formed at the center of a base portion 62a that is circular when viewed from above, and both end portions 62c and 62d are bent so that the tip ends are formed on the inner surface of the body 3. It is formed along.

  As described above, according to the present invention, the refrigerant inflow holes 8 and the refrigerant outflow holes 9 are opened above the header 4 and the inflowing refrigerant collides with the gas-liquid separation member 16 from above. In 61, it is possible to assemble the desiccant at low cost without minimizing the occurrence of abnormal noise and deteriorating gas-liquid separation.

DESCRIPTION OF SYMBOLS 1 Accumulator 2 Tank main body 3 Body 4 Header 5 Outer pipe 6 Inner pipe 7 Bag 8 Refrigerant inflow hole 9 Refrigerant outflow hole 10 Welding part 16 Gas-liquid separation member 20 Strainer 21 Mesh member 30 Binding band 41 Accumulator 42 Surface fastener 61 Accumulator 62 Clip

Claims (3)

A tank body including a cylindrical body having an upper end opening and a header connected to the opening of the body, the header including a refrigerant inflow hole and a refrigerant outflow hole that are open in a vertical direction; An inverted saddle-shaped gas-liquid separation member is disposed in the vicinity of the refrigerant inflow hole, an inner pipe extending near the inner bottom of the fuselage is connected to the refrigerant outflow hole, and an outer pipe is doubled on the outer side. Arranged to form a tube,
In the lower position of the gas-liquid separation member, a desiccant bag is wound and fixed to the outer pipe via a binding band,
The accumulator according to claim 1, wherein the outer pipe is integrally provided with a pair of flange portions for accommodating the desiccant bag.   The accumulator according to claim 1, wherein positioning means for preventing displacement of the binding band is integrally formed on the outer pipe.   The accumulator according to claim 1 or 2, wherein a plate-like member for preventing rotation of the desiccant bag is integrally formed on the outer pipe.