WO2018079182A1

WO2018079182A1 - Accumulator

Info

Publication number: WO2018079182A1
Application number: PCT/JP2017/035313
Authority: WO
Inventors: 侯史細川; 武治小澤
Original assignee: 株式会社不二工機
Priority date: 2016-10-25
Filing date: 2017-09-28
Publication date: 2018-05-03

Abstract

Provided is an accumulator with which it is possible to effectively suppress impact noise accompanying a bumping phenomenon when starting up a compressor, without increasing complexity, cost, size, or the like. An inflow opening 15 is provided at the bottom of a tank 10, and a gas-liquid separation accelerator plate 22 is placed so as to face the inflow opening 15 on the upper side of the inflow opening 15 in the tank 10.

Description

accumulator

The present invention relates to an accumulator (gas-liquid separator) used in a heat pump refrigeration cycle (hereinafter referred to as a heat pump system) such as a car air conditioner, a room air conditioner, and a refrigerator.

In general, a heat pump system 200 constituting a car air conditioner or the like includes, as illustrated in FIGS. 9A and 9B, a compressor 210, an outdoor heat exchanger 220, an indoor heat exchanger 230, an expansion valve 260, a four-way switching valve 240, and the like. In addition, an accumulator 250 is provided.

In such a system 200, switching between the cooling operation and the heating operation (flow path switching) is performed by the four-way switching valve 240, and during the cooling operation, the refrigerant is circulated in a cycle as shown in FIG. 9A. The outdoor heat exchanger 220 functions as a condenser, and the indoor heat exchanger 230 functions as an evaporator. On the other hand, during the heating operation, the refrigerant is circulated in a cycle as shown in FIG. 9B. At this time, the outdoor heat exchanger 220 functions as an evaporator and the indoor heat exchanger 230 functions as a condenser. In either operation, low-temperature and low-pressure gas-liquid mixed refrigerant is introduced into the accumulator 250 from the evaporator (the indoor heat exchanger 230 or the outdoor heat exchanger 220) via the four-way switching valve 240.

As the accumulator 250, for example, as described in Patent Document 1 or the like, a bottomed cylindrical tank whose upper surface opening is hermetically closed by a lid member provided with an inlet and an outlet, an inner diameter of the tank A gas-liquid separator with a smaller diameter in the shape of a cap or inverted bowl, an outflow pipe having a double pipe structure consisting of an inner pipe and an outer pipe, the upper end of which is connected to the outflow outlet, and the outflow pipe (outer of the outflow pipe) It is known to have a strainer or the like provided in the vicinity of the bottom of the pipe) for trapping and removing foreign substances contained in the liquid refrigerant and the oil (refrigeration machine oil) mixed therein.

The refrigerant introduced into the accumulator 250 collides with the gas-liquid separator and is diffused radially to be separated into a liquid-phase refrigerant and a gas-phase refrigerant, and the liquid-phase refrigerant (including oil) passes through the inner peripheral surface of the tank. The gas-phase refrigerant flows down and accumulates in the lower part of the tank, and the gas-phase refrigerant descends in the space formed between the inner pipe and the outer pipe in the outflow pipe (gas-phase refrigerant lower flow path). It rises and is sucked into the suction side of the compressor 210 and circulated.

Also, the oil that accumulates in the lower part of the tank together with the liquid phase refrigerant moves to the bottom side of the tank due to the difference in specific gravity and property with the liquid phase refrigerant, and is sucked into the compressor suction side through the outflow pipe. Strainer (mesh filter) → Oil return hole formed at the bottom of the outflow pipe (outer pipe) → Return to the compressor suction side with the gas phase refrigerant through the inner pipe inner space of the outflow pipe It is circulated (see also Patent Documents 2 and 3).

By the way, when the operation of the system (compressor) is stopped, liquid phase refrigerant containing oil accumulates in the lower part of the tank of the accumulator, but the oil is not compatible with the refrigerant and has a lower specific gravity than the refrigerant. Is separated into two layers, that is, an oil layer is formed on the upper side and a liquid phase refrigerant layer is formed on the lower side due to the difference in specific gravity and viscosity between the liquid phase refrigerant and the oil.

In such a two-layer separation state, when the system (compressor) is started, the pressure in the tank rapidly decreases, so the liquid-phase refrigerant suddenly and rapidly boils (hereinafter referred to as bumping) and generates a large impact sound. There was a problem that occurred.

The cause of this bumping phenomenon and the accompanying impact noise is that, even if the pressure in the tank (compressor suction side) drops when the compressor is started, the oil layer becomes a cover of the refrigerant layer until a certain point. (There is no bumping phenomenon in the oil layer), the occurrence of the bumping phenomenon is suppressed, but there is a pressure difference between the upper side (gas phase refrigerant) and the lower side (liquid phase refrigerant). When the pressure exceeds a predetermined pressure, it is presumed that the liquid-phase refrigerant is generated because it explosively boils at a stroke (see also Patent Document 2 describing an explanation of the bumping phenomenon in the compressor).

Further, when the oil and the liquid refrigerant are not in the two-layer separation state as described above when the compressor is stopped, that is, when the oil and the liquid refrigerant remain in the mixed state even when the compressor is stopped, or Even if the oil is not compatible with the refrigerant and has a higher specific gravity than the refrigerant, the liquid phase refrigerant layer is formed on the upper side and the oil layer is formed on the lower side. Depending on the situation, the bumping phenomenon in which the liquid-phase refrigerant boils explosively and the impact noise accompanying it may occur.

As one measure for suppressing the occurrence of such a bumping phenomenon and the accompanying impact noise, the Patent Document 2 provides a stirring blade on a rotating shaft (crankshaft) of a compressor that uses a reciprocating engine as a drive source, It has been proposed that when the compressor is started, the agitation blade is rotated to agitate the oil layer portion, and the liquid phase refrigerant is discharged to the oil upper portion.

Further, Patent Document 3 discloses that a gas phase discharged from a compressor is mainly used to reliably mix oil and liquid refrigerant in a two-layer separated state in an accumulator (tank). It has been proposed to stir a part of the refrigerant by blowing it into the liquid phase refrigerant from the bottom of the tank via a bypass channel with an on-off valve.

JP 2014-70869 A JP 2001-248923 A JP 2004-26395 A

As described above, the present inventors can suppress the occurrence of bumping phenomenon and the accompanying impact noise to a certain level by stirring the liquid portion composed of oil and liquid refrigerant in the tank when the compressor is started. However, in the above-mentioned conventional proposed technique, the present situation is that the impact sound accompanying the bumping phenomenon cannot be sufficiently eliminated. In addition, the above-mentioned conventional proposed technique requires a means for stirring (a stirring blade, a driving source for rotating the stirring blade, a bypass flow path with an on-off valve, and the like) separately, and an accumulator (and the same is provided). There is a problem that the heat pump system) is complicated, costly, and large.

The present invention has been made in view of the above circumstances, and an object thereof is to effectively provide an impact sound accompanying a bumping phenomenon at the start-up of the compressor without incurring complexity, cost increase, size increase, and the like. An object of the present invention is to provide an accumulator that can be suppressed.

In order to achieve the above object, the accumulator according to the present invention is basically arranged in the tank so that the tank provided with the inlet and the outlet and the refrigerant flowing in from the inlet collide with each other. The gas-liquid separation promoting plate, and an outflow pipe having one end connected to the outlet and the other end opened in the tank, and the inlet is provided in the lower part of the tank, The gas-liquid separation promoting plate is arranged on the upper side of the inlet in the tank so as to face the inlet.

The outlet is preferably provided at the lower part or the upper part of the tank.

In a preferred embodiment, the lower surface opening of the tank is hermetically closed by a bottom cover member provided with the inlet and the outlet.

In a further preferred aspect, the outflow pipe is provided integrally with the outflow port.

In another preferred embodiment, the outlet is provided in the center of the bottom lid member.

In another preferred embodiment, the gas-liquid separation promoting plate is provided integrally with a strainer provided at the lower end of the outflow pipe.

In a further preferred aspect, a bag holding part for holding a bag containing a desiccant is integrally provided on the gas-liquid separation promoting plate and the strainer.

In a further preferred aspect, the gas-liquid separation promoting plate and the strainer are integrally provided with a reinforcing upright plate portion whose outer peripheral portion is brought into contact with the inner periphery of the tank.

In another preferred embodiment, the upper surface opening of the tank is hermetically closed by the lid member provided with the outflow port.

In a further preferred aspect, the outflow pipe has a double pipe structure comprising an inner pipe connected to the outflow port and suspended in the tank, and an outer pipe disposed on the outer periphery of the inner pipe. The

In another preferred embodiment, the outlet is provided in the center of the lid member.

In another preferred embodiment, the gas-liquid separation promoting plate is provided at a lower end portion of the outflow pipe and is provided integrally with a strainer placed on the bottom portion of the tank.

In another preferred embodiment, the outflow pipe is integrally provided with a rib portion whose outer peripheral portion is brought into contact with the inner periphery of the tank.

In a further preferred aspect, a bag containing a desiccant is disposed between the gas-liquid separation promoting plate and the rib portion.

In the accumulator according to the present invention, the gas-liquid mixed state refrigerant is introduced upward into the tank from the inlet provided in the lower part of the tank, and the lower surface side of the gas-liquid separation promoting plate disposed on the upper side of the inlet And the diffused refrigerant moves to the upper side through a gap between the inner peripheral surface of the tank and the outer peripheral surface of the gas-liquid separation promoting plate, for example, so that gas-liquid separation is promoted. In addition, the liquid-phase refrigerant is agitated particularly above the gas-liquid separation promoting plate. Therefore, it is possible to effectively suppress the bumping phenomenon in which the liquid-phase refrigerant boils explosively at the time of starting the compressor and the generation of the impact sound accompanying it.

In this case, basically, an inlet is provided in the lower part of the tank, and a gas-liquid separation promoting plate may be disposed above the inlet in the tank. Compared to the case of using a drive source for rotating it, a bypass flow path with an on-off valve, and the like, the configuration of the accumulator can be simplified, and cost reduction, size reduction, and the like can be achieved.

The partial notch half longitudinal cross-sectional view which shows 1st Embodiment of the accumulator which concerns on this invention. The top view which shows the built-in unit of the accumulator of 1st Embodiment. The half longitudinal cross-sectional view which shows the built-in unit of the accumulator of 1st Embodiment. The partial notch longitudinal cross-sectional view which shows 2nd Embodiment of the accumulator which concerns on this invention. FIG. 4 is a cross-sectional view taken along the line U-U in FIG. 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. The top view which shows the strainer with a gas-liquid separation promotion board of the accumulator of 2nd Embodiment. The longitudinal cross-sectional view which shows the strainer with the gas-liquid separation promotion board of the accumulator of 2nd Embodiment. The partial notch half longitudinal cross-sectional view which shows 3rd Embodiment of the accumulator which concerns on this invention. The top view which shows the built-in unit of the accumulator of 3rd Embodiment. The half longitudinal section showing the built-in unit of the accumulator of a 3rd embodiment. The schematic block diagram which shows an example of a heat pump system and shows the refrigerant | coolant flow (cycle) at the time of air_conditionaing | cooling operation. The schematic block diagram which shows an example of a heat pump system and shows the refrigerant | coolant flow (cycle) at the time of heating operation.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a partially cut-out half longitudinal sectional view showing a first embodiment of an accumulator according to the present invention.

The accumulator 1 of the illustrated embodiment is used as an accumulator 250 in, for example, a heat pump system 200 constituting a car air conditioner for an electric vehicle as shown in FIGS. 9A and 9B described above, and is made of a metal such as stainless steel or aluminum alloy. A cylindrical tank 10 with a top surface portion having an open lower surface is provided, and the lower surface opening of the tank 10 is airtightly closed by a bottom cover member 12 made of the same metal. In addition, the accumulator 1 of this embodiment is installed vertically as shown in the figure, that is, with the bottom cover member 12 on the bottom (ground) side and the top surface portion 13 of the tank 10 on the top (top) side.

The bottom cover member 12 is provided with an inflow port 15 and an outflow port 16 side by side so as to pass through the bottom cover member 12 and open up and down. Here, an outlet 16 is provided at the center of the bottom lid member 12 (on the center line of the tank 10), and an inlet 15 is provided on the left side thereof.

The outflow pipe 16 is continuously provided with an outflow pipe 30 consisting of a straight pipe (a straight pipe along the center line) for guiding the gas-phase refrigerant from the upper part of the tank 10 to the outflow outlet 16. The upper end side (other end side) opening is positioned slightly below the top surface portion 13 of the tank 10. The outflow pipe 30 may be integrally formed with the bottom cover member 12 or may be formed separately and fixed by caulking or the like.

A short cylindrical inner fitting connecting portion 19 in which a male screw portion for connecting a built-in unit 20 to be described later by a screw-in type is formed in the upper surface side central portion (a portion including the central outlet 16) of the bottom lid member 12. Is protruding.

Further, a built-in unit 20 is disposed in the tank 10. The built-in unit 20 is made of, for example, a synthetic resin, and includes an annular disk-shaped gas-liquid separation promoting plate 22 at a lower portion thereof as can be understood by referring also to FIGS. 2A and 2B. The gas-liquid separation promoting plate 22 collides with the refrigerant flowing into the tank 10 from the inlet 15 and diffuses radially, and the refrigerant diffused by collision collides with the inner peripheral surface of the tank 10 and the outer periphery of the gas-liquid separation promoting plate 22. The outer diameter of the tank 10 is slightly smaller than the inner diameter of the tank 10 so as to flow upward through the surface, and the inner diameter of the annular disk is substantially equal to the inner diameter of the strainer 40 described later. The bottom cover member 12 (the inlet 15 in the inlet 15) is disposed on the upper side by a predetermined distance so as to face the inlet 15.

Further, a short cylindrical outer fitting connection formed with a female screw part screwed into a male screw part of an inner fitting connection part 19 provided in the bottom cover member 12 at the center on the lower surface side of the gas-liquid separation promoting plate 22. The part 29 is projected downward. By doing in this way, since the bottom cover member 12 and the built-in unit 20 can be connected with a screwing type, assembly is easy and easy.

A strainer 40 is provided at the center on the upper surface side of the gas-liquid separation promoting plate 22 so as to surround the lower end portion of the outflow pipe 30, and equiangular intervals (that is, 90 ° intervals) at four locations on the outer periphery on the upper surface side. ), And the outer peripheral portion of the reinforcing upright plate portion 23 is brought into contact with the inner periphery of the tank 10. In the illustrated example, the reinforcing upright plate portions 23 are provided on the front, rear, left and right of the outer periphery on the upper surface side of the gas-liquid separation promoting plate 22, and one of the reinforcing upright plate portions 23 is provided on the bottom cover member 12. It is disposed so as to be located immediately above the inlet 15.

A bobbin-shaped bag holding portion having a long cylindrical portion 27 having a slightly smaller diameter than the outflow port 16 and the strainer 40, into which the outflow pipe 30 is inserted, on the inner peripheral side of the reinforcing upright plate portion 23 above the strainer 40. 24 is provided integrally. The bobbin-shaped bag holding part 24 is configured to wind and hold a bag 70 containing a desiccant M around the long cylindrical part 27 in a cylindrical shape or a C shape in a plan view, and to wind a binding band 28 around the outer periphery thereof. ing. In this case, the upper and lower ends of the held bag 70 are slightly pressed against the pair of upper and lower flange portions 25 a and 26 b of the bag holding portion 24. In addition, the bag 70 accommodated in the bag holding part 24 is made of a cloth-like body such as felt having air permeability, water permeability and required shape retention, and the granular desiccant M is substantially filled therein. In this case, it has a height of about half to 2/3 of the tank 10.

On the other hand, the strainer 40 is integrally provided on the gas-liquid separation promoting plate 22 and includes a cylindrical mesh filter 45 and a case portion 42 to which the mesh filter 45 is fixed. The mesh filter 45 is made of, for example, a wire mesh or a mesh material made of synthetic resin. The case part 42 is composed of upper and lower annular disk parts and inner peripheral end parts (four places) of the reinforcing upright plate part 23 positioned therebetween. That is, four windows that are rectangular in a side view are defined between the four columnar portions (inner peripheral end portions), and the mesh filter 45 is stretched on each window portion. The mesh filter 45 may be integrated by insert molding when the case portion 42 (built-in unit 20) is molded.

Near the lower end of the outflow pipe 30 provided integrally with the bottom cover member 12 by integral molding or caulking, in other words, inside the mesh filter 45 and below the mesh filter 45, above the outlet port 16, An oil return hole 36 is provided. The diameter of the oil return hole 36 is set to about 1 mm, for example.

In the accumulator 1 having such a configuration, the low-temperature and low-pressure gas-liquid mixed refrigerant from the evaporator is introduced upward into the tank 10 through the inlet 15, and the introduced refrigerant promotes gas-liquid separation. While staying on the lower surface of the plate 22, it diffuses radially, and the diffused refrigerant is gradually moved upward through the gap between the inner peripheral surface of the tank 10 and the outer peripheral surface of the gas-liquid separation promoting plate 22. Thereby, rectification is performed and the liquid-phase refrigerant and the gas-phase refrigerant are effectively separated. In this case, the liquid-phase refrigerant (including oil) accumulates in the lower space of the tank 10, and the vapor-phase refrigerant rises into the upper space of the tank 10, and passes through the upper space of the tank 10 → the outflow pipe 30 → the outlet 16. Through the suction side of the compressor 210 and circulated.

Further, the oil that accumulates in the lower space of the tank 10 together with the liquid phase refrigerant moves to the bottom cover member 12 side of the tank 10 due to a difference in specific gravity and property with the liquid phase refrigerant, and the compressor via the outflow pipe 30. The refrigerant is sucked into the gas phase refrigerant sucked into the suction side, passes through the mesh filter 45 of the strainer 40 → the oil return hole 36, is returned to the compressor suction side together with the gas phase refrigerant, and is circulated. When passing through the mesh filter 45, foreign matter such as sludge is captured, and the foreign matter is removed from the circulating refrigerant (including oil).

As described above, in the accumulator 1 of the present embodiment, the refrigerant in the gas-liquid mixed state is introduced upward into the tank 10 from the inlet 15 provided in the lower part of the tank 10, and the lower surface of the gas-liquid separation promoting plate 22. And the diffused refrigerant is moved upward through a gap between the inner peripheral surface of the tank 10 and the outer peripheral surface of the gas-liquid separation promoting plate 22 to promote gas-liquid separation. Is done. In addition, since the liquid-phase refrigerant is agitated as the gas-phase refrigerant rises in the liquid, particularly above the gas-liquid separation plate 22, a bumping phenomenon in which the liquid-phase refrigerant boils explosively at the start of the compressor, and It is possible to suppress the generation of the impact sound associated therewith.

In this case, basically, the inlet 15 is provided in the lower part of the tank 10 and the gas-liquid separation promoting plate 22 may be disposed above the inlet 15 in the tank 10. As compared with the case of using a stirring blade, a drive source for rotating it, a bypass flow path with an on-off valve, etc., the configuration of the accumulator can be simplified, and cost reduction, downsizing, etc. can be achieved. it can.

[Second Embodiment]
3 is a partially cutaway longitudinal sectional view showing a second embodiment of the accumulator according to the present invention, FIG. 4 is a sectional view taken along the line U-U in FIG. 3, and FIG. 5 is taken along the line VV in FIG. FIG.

The accumulator 2 of the illustrated embodiment is used as an accumulator 250 in a heat pump system 200 constituting a car air conditioner for an electric vehicle, for example, as shown in FIGS. 9A and 9B described above, as in the first embodiment. Alternatively, it has a bottomed cylindrical tank 10A made of metal such as aluminum alloy, and the upper surface opening of the tank 10A is hermetically closed by the same metal lid member 12A. The accumulator 2 of the present embodiment is installed vertically, for example, as shown in the drawing, that is, with the lid member 12A on the upper (top) side and the bottom portion 13A of the tank 10A on the lower (ground) side.

In FIG. 3, an inflow port 15A is provided on the left side of the bottom portion 13A of the tank 10A (outside the strainer 40A placed on the bottom portion 13A) so as to pass through the bottom portion 13A and open up and down. A stepped outlet 16A is provided at the center of the member 12A (on the center line of the tank 10A) so as to penetrate the lid member 12A and open up and down.

The lower end of the outlet 16A is connected to the upper end of an outflow pipe 30A for guiding the gaseous refrigerant from the upper part of the tank 10A to the outlet 16A.

The outflow pipe 30A has an upper end connected to the lower part of the outlet 16A by caulking, press-fitting or the like and suspended in the tank 10A, for example, a metal inner pipe 31A and an outer periphery of the inner pipe 31A. For example, it has a double pipe structure composed of a bottomed outer pipe 32A made of synthetic resin.

Here, at least one of the inner pipe 31A and the outer pipe 32A is preferably formed with a rib for securing a predetermined gap therebetween. For example, a plurality of plate-like ribs projecting outward in the radial direction at equal angular intervals along the longitudinal direction (vertical direction) outside the inner pipe 31A (portion below the lid member 12A) Then, the outer pipe 32A may be externally fixed to the outer peripheral side of the plurality of plate-like ribs in a press-fit manner. Alternatively, a plurality of plate-like ribs projecting radially inward along the longitudinal direction (vertical direction) and at equal angular intervals inside the outer pipe 32A, The inner pipe 31A may be inserted and fixed on the inner peripheral side in a press-fit manner.

The lower end portion of the outer pipe 32A is fitted and fixed by press-fitting or the like to an upper portion 42aA having an inner circumferential step in a case portion 42A of a strainer 40A described later. The lower end of the inner pipe 31A is positioned slightly above the bottom 33A of the outer pipe 32A, and the upper end of the outer pipe 32A (that is, the upper end side (the other end of the outflow pipe 30A formed by the inner pipe 31A and the outer pipe 32A) Side) opening) is positioned slightly below the lid member 12A (outflow port 16A). An oil return hole 36A is formed at the center of the bottom 33A of the outer pipe 32A. The hole diameter of the oil return hole 36A is set to about 1 mm, for example.

Further, in the present embodiment, as can be understood with reference to FIG. 4, in order to hold and fix the outflow pipe 30A (the outer pipe 32A) in the tank 10A, from the middle part (in the vertical direction) of the outer pipe 32A. Four rib portions 35A extending in a substantially cross shape in plan view are integrally provided on the outer periphery slightly above, and a short cylindrical shape is formed on the outer peripheral portion of an annular ring portion 37A that connects the outer periphery of the rib portions 35A. A pressing plate portion 39A is erected, and the pressing plate portion 39A (the outer peripheral surface thereof) is brought into contact with the inner periphery of the tank 10A. Between the adjacent rib portions 35A (four gaps in a fan shape in plan view) is a passage through which the refrigerant passes. In addition, although the short cylindrical holding plate portion 39A is erected upward at the outer peripheral portion of the annular ring portion 37A in FIG. 3, it may be erected downward.

On the other hand, the strainer 40A provided at the lower end of the outflow pipe 30A is placed and fixed on the bottom 13A of the tank 10A. As can be understood with reference to FIGS. A bottomed cylindrical case portion 42A made of resin and a cylindrical mesh filter 45A integrated with the case portion 42A by insert molding or the like. The mesh filter 45A is made of, for example, a wire mesh or a mesh material made of synthetic resin.

The case portion 42A of the strainer 40A is erected on the outer peripheral stepped upper portion 42aA in which the lower end portion of the outer pipe 32A is fitted and fixed, the bottom plate portion 42cA, and the outer periphery of the bottom plate portion 42cA at equal angular intervals, And four columnar portions 42bA connecting the upper portions 42aA. An annular connecting band part is provided on the outer periphery of the bottom plate part 42cA, and upper and lower ends of the mesh filter 45A are fixed to the connecting band part and the lower side of the upper part 42aA. That is, four windows 44A that are rectangular in a side view are defined between the four columnar portions 42bA, and a mesh filter 45A is stretched on each window 44A portion. The mesh filter 45A may be integrated by insert molding when the case portion 42A is molded. Further, the four columnar portions 42bA are provided with a die-cutting gradient, but the radial widths of the four columnar portions 42bA are substantially equal. Further, the method of providing the mesh filter 45A in the case portion 42A is not limited to the above.

An annular disc-shaped gas-liquid separation promoting plate 41A is integrally provided at the upper end of the case portion 42A of the strainer 40A. In the gas-liquid separation promoting plate 41A, the refrigerant flowing into the tank 10A from the inlet 15A collides and diffuses radially, and the collided and diffused refrigerant is in the inner peripheral surface of the tank 10A and the outer periphery of the gas-liquid separation promoting plate 41A. An annular disk whose outer diameter is slightly smaller than the inner diameter of the tank 10A so as to flow upward through the surface, and whose bottom surface faces the inflow port 15A (the flow in the bottom 13A). It is arranged a predetermined distance above the upper surface of the inlet 15A).

Further, at four positions between the cylindrical case portion 42A (the outer peripheral surface thereof) and the gas-liquid separation promoting plate 41A (the lower surface thereof) are equiangular intervals (ie, 90 ° intervals), and are substantially right-angled triangles when viewed from the side. The reinforcing plate portion 43A is integrally provided. In the illustrated example, the reinforcing plate portion 43A is provided on the front, rear, left and right sides of the outer periphery of the case portion 42A, and the strainer 40A is located immediately above the inlet 15A provided on one of the reinforcing plate portions 43A on the bottom portion 13A. It is arranged like this. Of course, the strainer 40A may be disposed such that an intermediate portion between a pair of adjacent reinforcing plate portions 43A is located immediately above the inflow port 15A.

A bag 70A containing a desiccant M is wound in a cylindrical shape or a C shape in a plan view between the rib portion 35A and the gas-liquid separation promoting plate 41A on the outer periphery of the outer pipe 32A, and a binding band 38A is wrapped around the outer periphery of the bag 70A. It is designed to be wound and fixed. In this case, the upper and lower ends of the held bag 70A are slightly pressed against the rib 35A and the gas-liquid separation promoting plate 41A. That is, in the present embodiment, the rib portion 35A holds the upper side of the bag 70A, and the gas-liquid separation promoting plate 41A is used as a flange that holds the lower side of the bag 70A. Here, the bag 70A wound around the outer periphery of the outflow pipe 30A (the outer pipe 32A thereof) is depicted here as having about half the height of the tank 10A, but it corresponds to the maximum refrigerant storage amount of the tank 10A. It is advantageous for securing the refrigerant storage amount and for countermeasures against bumping noise to be as low as possible or higher than that.

Also in the accumulator 2 having such a configuration, the low-temperature low-pressure gas-liquid mixed refrigerant from the evaporator is introduced upward into the tank 10A through the inlet 15A, as in the accumulator 1 of the first embodiment. The introduced refrigerant is diffused radially while staying on the lower surface of the gas-liquid separation promoting plate 41A, and the diffused refrigerant is a gap between the inner peripheral surface of the tank 10A and the outer peripheral surface of the gas-liquid separation promoting plate 41A. The liquid phase refrigerant and the gas phase refrigerant are effectively separated by being moved upward through the air and rectified. In this case, the liquid-phase refrigerant (including oil) accumulates in the lower space of the tank 10A, and the vapor-phase refrigerant rises into the upper space of the tank 10A. The upper space of the tank 10A → the inner pipe 31A in the outlet pipe 30A The space formed between the outer pipe 32A (gas-phase refrigerant downstream flow path), the inner space of the inner pipe 31A, and the suction port of the compressor 210 through the outlet 16A is circulated.

Also, the oil accumulated in the lower space of the tank 10A together with the liquid phase refrigerant moves to the bottom 13A side of the tank 10A due to a difference in specific gravity and property with the liquid phase refrigerant, and the compressor suction side through the outflow pipe 30A. Is sucked by the gas-phase refrigerant sucked in, and is returned to the compressor suction side together with the gas-phase refrigerant through the mesh filter 45A → the oil return hole 36A → the inner pipe 31A of the strainer 40A and circulated. When passing through the mesh filter 45A, foreign matter such as sludge is captured, and the foreign matter is removed from the circulating refrigerant (including oil).

Therefore, substantially the same effect as the first embodiment is obtained.

In the second embodiment, the outflow pipe 30A having a double pipe structure composed of the inner pipe 31A and the outer pipe 32A is adopted. However, in the present invention, one end side is connected to the outflow port, and the other end is connected. Needless to say, the present invention can also be applied to an accumulator or the like having an outflow pipe such as a U-shape whose side (opening) is opened in the upper space in the tank.

[Third Embodiment]
FIG. 7 is a partially cut-out half longitudinal sectional view showing a third embodiment of an accumulator according to the present invention.

The accumulator 3 of the illustrated embodiment is different from the accumulator 1 of the first embodiment described above in the structure of the bag holding portion in the built-in unit 20 and the connecting structure portion of the bottom cover member 12 and the built-in unit 20. The other parts are basically the same. Accordingly, parts having the same function are denoted by the same reference numerals (symbols obtained by adding “B” to the reference numerals of the respective parts of the first embodiment), description thereof is omitted, and only differences will be described below.

In the accumulator 3 of the present embodiment, a short cylindrical inner fitting connecting portion 19B in which an annular concave portion for connecting the built-in unit 20B by a snap fit type is provided at the center portion on the upper surface side of the bottom lid member 12B. On the other hand, the built-in unit 20B (the center on the lower surface side of the gas-liquid separation promoting plate 22B) is provided with a short cylindrical outer fitting connecting portion 29B formed with an annular projection that fits into the annular recess of the inner fitting connecting portion 19B. It has been. Even with such a snap-fit type, assembly is easy and easy.

Further, in this embodiment, as can be understood by referring to FIGS. 8A and 8B in addition to FIG. 7, a cylindrical or plan view is formed on the inner peripheral side of the reinforcing upright plate portion 23B above the strainer 40B in the built-in unit 20B. A bottomed cylindrical bag holding portion 24 </ b> B is integrally provided to hold substantially the entire bag 70 </ b> B containing the desiccant M wound in a C shape. The bag holding part 24B is formed with a plurality of long holes 26B for allowing the refrigerant to pass in the thickness direction. Further, a small-diameter short cylindrical central cylindrical portion 27B into which the outflow pipe 30B is inserted (press-fit) is provided on the inner peripheral side of the bag holding portion 24B, and the bag accommodated in the bag holding portion 24B. The outflow pipe 30B is inserted inside the 70B with a slight gap. In addition, the bag 70B containing the desiccant M is rounded in advance along the inner periphery of the bag holding portion 24B, accommodated in the bag holding portion 24B, and then the outflow pipe 30B is inserted into the central cylindrical portion 27B ( The bag holding portion 24B may be mounted on the bottom lid member 12B so as to be disposed in the tank 10B, or the outlet pipe 30B may be press-fitted into the central cylindrical portion 27B. The holder 24B may be attached to the bottom lid member 12B, and then the bag 70B containing the desiccant M may be inserted along the inner periphery of the bag holder 24B and disposed in the tank 10B.

That is, also in the present embodiment, the built-in unit 20B is integrally provided with the external fitting connection portion 29B, the gas-liquid separation promoting plate 22B, the strainer 40B, the reinforcing upright plate portion 23B, the bag holding portion 24B, and the like. ing.

Other configurations are basically the same as those of the first embodiment, and it is needless to mention that substantially the same functions and effects as those of the first embodiment can be obtained.

Further, the third embodiment has an advantage that the number of parts can be reduced as compared with the first embodiment because a binding band or the like is not required for holding the desiccant-containing bag in the bag holding portion.

1 Accumulator (first embodiment)
2 Accumulator (second embodiment)
3 Accumulator (Third embodiment)
DESCRIPTION OF SYMBOLS 10 Tank 12 Bottom cover member 12A Cover member 13 Tank top surface part 13A Tank bottom part 15 Inlet 16 Outlet 19 Inner fitting connection part 20 Built-in unit 22 Gas-liquid separation promotion plate 23 Reinforcement standing plate part 24 Bag holding part 27 Long cylinder Part 28 binding band 29 outer fitting connecting part 30 outflow pipe 31A inner pipe 32A outer pipe 35A rib part 36 oil return hole 38A binding band 40 strainer 41A gas-liquid separation promoting plate 42 case part 45 mesh filter 70 bag M desiccant

Claims

A tank provided with an inflow port and an outflow port, a gas-liquid separation promoting plate disposed in the tank so that a refrigerant flowing in from the inflow port collides, one end side connected to the outflow port, and the other end An accumulator comprising an outflow pipe having a side opened in the tank,
The accumulator is characterized in that the inlet is provided at a lower portion of the tank, and the gas-liquid separation promoting plate is disposed on the upper side of the inlet in the tank so as to face the inlet.
The accumulator according to claim 1, wherein the outlet is provided at a lower part or an upper part of the tank.
The accumulator according to claim 2, wherein the lower surface opening of the tank is hermetically closed by a bottom cover member provided with the inflow port and the outflow port.
The accumulator according to claim 3, wherein the outflow pipe is integrally provided at the outflow port.
The accumulator according to claim 3 or 4, wherein the outlet is provided at the center of the bottom lid member.
The accumulator according to any one of claims 3 to 5, wherein the gas-liquid separation promoting plate is provided integrally with a strainer provided at a lower end portion of the outflow pipe.
The accumulator according to claim 6, wherein a bag holding portion for holding a bag containing a desiccant is integrally provided on the gas-liquid separation promoting plate and the strainer.
The accumulator according to claim 6, wherein the gas-liquid separation promoting plate and the strainer are integrally provided with a reinforcing vertical plate portion whose outer peripheral portion is brought into contact with the inner periphery of the tank.
The accumulator according to claim 2, wherein an upper surface opening of the tank is hermetically closed by a lid member provided with the outflow port.
The outflow pipe has a double pipe structure composed of an inner pipe connected to the outlet and suspended in the tank, and an outer pipe disposed on the outer periphery of the inner pipe. The accumulator according to claim 9.
The accumulator according to claim 9 or 10, wherein the outlet is provided in the center of the lid member.
The gas-liquid separation promoting plate is provided at a lower end portion of the outflow pipe and is provided integrally with a strainer placed on the bottom portion of the tank. The accumulator described in.
The accumulator according to any one of claims 9 to 12, wherein the outflow pipe is integrally provided with a rib portion whose outer peripheral portion is brought into contact with the inner periphery of the tank.
The accumulator according to claim 13, wherein a bag containing a desiccant is disposed between the gas-liquid separation promoting plate and the rib portion.