JP6341958B2 - accumulator - Google Patents

Description

  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 a compressor 210, an outdoor heat exchanger 220, an indoor heat exchanger 230, an expansion valve 260, four directions, as illustrated in FIGS. In addition to the switching valve 240 and the like, 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. During the cooling operation, the refrigerant is circulated in a cycle as shown in FIG. At this time, 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. 11B. 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, an accumulator according to the present invention basically includes a tank provided with an inflow port and an outflow port, one end side connected to the outflow port, and the other end side opened in the tank. A gas-liquid separator having a cap shape or an inverted thin bowl shape fixedly disposed below the inflow port so as to cover the opening on the other end side. In order to alleviate the impact on the liquid separator, an impact buffer member made of a porous body or an elastic body is provided on the back surface of the gas-liquid separator.

  The porous body is preferably made of a foam material or a massive fiber material.

  In a preferred aspect, the impact relaxation member is provided along the back surface of the gas-liquid separator.

  In another preferred embodiment, 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 impact reducing member is provided with an insertion hole for passing the outflow pipe.

  In another preferred aspect, the impact reducing member is formed with a communication space that communicates the space below the gas-liquid separator in the tank and the other end side opening.

  In another preferred embodiment, the shock absorbing member is further provided on the inner peripheral surface of the tank.

  In the accumulator according to the present invention, an impact mitigating member made of a porous body or an elastic body is provided on the back surface of the gas-liquid separator. The back surface of the gas-liquid separator enters the inside of the porous body provided on the back surface of the gas-liquid separator (that is, a small hole formed in the porous body) or the liquid-phase refrigerant that has boiled in the tank. The elastic body provided in is compressed and deformed. Therefore, the impact on the gas-liquid separator due to the bumping phenomenon is alleviated and the vibration of the gas-liquid separator is suppressed, so that the impact sound accompanying the bumping phenomenon at the start of the compressor can be effectively suppressed. .

  In this case, basically, a porous body or an elastic body produced inexpensively and simply may be arranged on the back surface of the gas-liquid separator, so that the stirring blade and the rotating blade are rotated as the stirring means as in the prior art. Therefore, the accumulator can be simplified in configuration, and cost reduction, downsizing, and the like can be achieved as compared with the case of using a drive source for this purpose, a bypass flow path with an on-off valve, and the like.

1 is a longitudinal sectional view showing a first embodiment of an accumulator according to the present invention. FIG. 3 is a cross-sectional view taken along the line U-U in FIG. 1. Sectional drawing which follows the VV arrow line of FIG. The principal part expansion longitudinal cross-sectional view which shows the principal part of the state at the time of bumping phenomenon generation | occurrence | production in the accumulator shown by FIG. The longitudinal cross-sectional view which shows 2nd Embodiment of the accumulator which concerns on this invention. FIG. 6 is an enlarged vertical cross-sectional view showing a main part of a state when a bumping phenomenon occurs in the accumulator shown in FIG. 5. The partial notch front view which shows the modification of 1st Embodiment. Sectional drawing according to the WW arrow line of FIG. Sectional drawing which follows the XX arrow line of FIG. The partial notch front view which shows the modification of 2nd Embodiment. An example of a heat pump system is shown, (A) is a schematic block diagram which shows the refrigerant | coolant flow (cycle) at the time of cooling operation, (B) is a schematic block diagram which 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]
1 is a longitudinal sectional view showing a first embodiment of an accumulator according to the present invention, FIG. 2 is a sectional view taken along the line U-U in FIG. 1, and FIG. 3 is a section taken along the line V-V in FIG. FIG. In FIG. 1, the plate-like rib 36 (detailed later) of the outflow pipe 30 is omitted.

  The accumulator 1 according to the first embodiment shown in the figure 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. A bottomed cylindrical tank 10 made of metal such as an aluminum alloy is provided, and the upper surface opening of the tank 10 is hermetically closed by the same metal lid member 12. In addition, the accumulator 1 of this embodiment is installed vertically as shown in the figure, that is, with the lid member 12 on the upper (top) side and the bottom 13 of the tank 10 on the lower (ground) side.

  An inflow port 15 and a stepped outflow port 16 are provided side by side on the lid member 12, and a cap-shaped or inverted thin bowl-shaped gas slightly smaller than the inner diameter of the tank 10 is provided below the lid member 12. A liquid separator 18 is disposed, and an upper end portion of the outflow pipe 30 is connected to a lower portion of the outflow port 16.

  The outflow pipe 30 has an upper end connected to the lower part of the outlet 16 by caulking, press fitting, or the like, and is suspended in the tank 10 through a through hole 19 provided in the ceiling 18a of the gas-liquid separator 18. In addition, a double pipe structure including a metal inner pipe 31 and a bottomed outer pipe 32 made of, for example, a synthetic resin disposed on the outer periphery of the inner pipe 31 is formed.

  Here, at least one of the inner pipe 31 and the outer pipe 32 is preferably formed with a rib for ensuring a predetermined gap therebetween. In the illustrated example, as can be understood with reference to FIG. 2, the outer side of the inner pipe 31 (the part below the gas-liquid separator 18) is along the longitudinal direction (up and down direction) and at equal angular intervals. A plurality of plate-like ribs 36 project outwardly in the radial direction, and an outer pipe 32 is inserted and fixed to the outer peripheral side of the three plate-like ribs 36 in a press-fit manner.

  Further, the inner pipe 31, the outer pipe 32, and the plate-like rib 36 may be integrally formed by extrusion molding using a synthetic resin material, an aluminum material, or the like. That is, the above-mentioned double tube structure can be an integrally molded product using an aluminum extruded material or the like.

  The lower end portion of the outer pipe 32 is fitted and fixed to the upper portion 42a with an inner circumferential step in the case 42 of the strainer 40 described later by press fitting or the like. The lower end of the inner pipe 31 is positioned slightly above the bottom 32 b of the outer pipe 32, and the upper end of the outer pipe 32 is positioned slightly below the lid member 12. An oil return hole 35 is formed at the center of the bottom 32 b of the outer pipe 32. The hole diameter of the oil return hole 35 is set to about 1 mm, for example.

  The gas-liquid separator 18 is made of metal such as stainless steel or aluminum alloy, and is an opening formed by the inner pipe 31 and the outer pipe 32 (the upper end portion thereof) of the outflow pipe 30 (the other end side of the outflow pipe 30). It is fixedly arranged below the inflow port 15 so as to cover the (opening). The gas-liquid separator 18 is provided with a through hole 19 through which the upper end portion of the outflow pipe 30 (the inner pipe 31) is inserted and a disk-like ceiling portion 18a disposed opposite to the inflow port 15, and a ceiling portion. And a cylindrical peripheral wall portion 18b extending downward from the outer periphery of 18a.

  In assembling the gas-liquid separator 18 and the inner pipe 31 to the lid member 12, the gas-liquid separator 18 is provided with the upper end portion of the inner pipe 31 (the portion above the portion where the plate-like ribs 36 are formed). It passes through the through-hole 19 and is press-fitted or fixed to the outlet 16 from below. Thereby, the gas-liquid separator 18 is held and fixed so as to be sandwiched between the plate-like rib 36 of the inner pipe 31 and the lower end surface of the lid member 12.

  In addition, a hook-like part compression-bent by bulge molding or the like is provided near the upper end of the inner pipe 31 so that the gas-liquid separator 18 is sandwiched between the hook-like part and the lower end surface of the lid member 12. May be held and fixed.

  The strainer 40 is placed and fixed on the bottom 13 of the tank 10, and as can be understood by referring to FIG. 3, a bottomed cylindrical case 42 made of synthetic resin and insert molding or the like in the case 42. And a cylindrical mesh filter 45 integrated with each other. The mesh filter 45 is made of, for example, a wire mesh or a mesh material made of synthetic resin.

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

  In addition, in the tank 10, a bag 50 containing a desiccant M, which is approximately half the height of the tank 10, is placed on the bottom portion 13 along the inner periphery of the tank 10 in order to absorb and remove moisture in the refrigerant. It is placed on and distributed. The bag 50 is made of a cloth-like body such as felt having air permeability, water permeability and required shape retention, and is filled with a granular desiccant M in the bag.

  In the accumulator 1 having such a configuration, the low-temperature low-pressure gas-liquid mixed refrigerant from the evaporator is introduced into the tank 10 through the inlet 15 as in the conventional one, and the introduced refrigerant is The gas-liquid separator 18 (the ceiling portion 18a of the gas-liquid separator 18) is collided and diffused radially to be separated into a liquid-phase refrigerant and a gas-phase refrigerant, and the liquid-phase refrigerant (including oil) travels along the inner peripheral surface of the tank 10. And the gas-phase refrigerant is a space formed between the inner pipe 31 and the outer pipe 32 in the outflow pipe 30 (gas-phase refrigerant lower flow path) → the inner pipe 31 The air is drawn into the suction side of the compressor 210 through the inner space and circulated.

  Also, the oil that accumulates in the lower space of the tank 10 together with the liquid phase refrigerant moves to the bottom 13 side of the tank 10 due to the difference in specific gravity and properties with the liquid phase refrigerant, and the compressor suction side through the outflow pipe 30. Is sucked into the gas-phase refrigerant sucked in, and passed through the mesh filter 45 of the strainer 40 → the oil return hole 35 → the inner space of the inner pipe 31 and returned to the compressor suction side together with the gas-phase refrigerant and 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).

  In addition to the above configuration, in the accumulator 1 of this embodiment, the back surface of the gas-liquid separator 18 (the surface on the liquid-phase refrigerant side that accumulates in the tank 10) is subjected to an impact on the gas-liquid separator 18 due to a bumping phenomenon. In order to mitigate, an impact mitigating member 20 made of a porous body is provided.

  The impact mitigating member 20 (porous body) is provided with an insertion hole 21 through which the outflow pipe 30 is passed, and has an outer diameter substantially the same as that of the gas-liquid separator 18 (the peripheral wall portion 18b). The upper surface of the gas-liquid separator 18 is in contact with the ceiling 18a (the lower surface thereof) and the outer peripheral surface thereof is in contact with the peripheral wall 18b (the inner peripheral surface thereof) of the gas-liquid separator 18. The gas-liquid separator 18 is fixed to the back surface by pasting, caulking, or the like. Here, the outflow pipe 30 is inserted into the insertion hole 21 with a predetermined gap, and the insertion hole 21 has a space below the gas-liquid separator 18 in the tank 10 and the outflow pipe. The communication space communicates with the opening (the other end side opening of the outflow pipe 30) formed by the 30 inner pipes 31 and the outer pipe 32 (the upper end portion thereof).

  The impact relaxation member 20 (porous body) is made of, for example, a resin foam such as rubber or a metal foam material such as aluminum, a resin such as felt, a metal such as steel wool, or a massive fiber material such as glass wool. It is made from.

  As described above, in the accumulator 1 of the present embodiment, the impact relaxation member 20 made of a porous body is provided on the back surface of the gas-liquid separator 18, and the liquid phase boiled in the tank 10 when a bumping phenomenon occurs. A part of the refrigerant enters the inside of the porous body (impact mitigating member 20) provided on the back surface of the gas-liquid separator 18 (that is, a small hole formed in the porous body) (see FIG. 4). Therefore, the impact on the gas-liquid separator 18 due to the bumping phenomenon is alleviated and the vibration of the gas-liquid separator 18 is suppressed, so that the impact sound accompanying the bumping phenomenon at the start of the compressor can be effectively suppressed. Can do.

  In this case, basically, a porous body produced inexpensively and simply may be disposed on the back surface of the gas-liquid separator 18, so that, as in the prior art, as a stirring means, a stirring blade and for rotating it. Compared to a case where a drive source, a bypass flow path with an on-off valve, or the like is used, the configuration of the accumulator can be simplified, and cost reduction, size reduction, and the like can be achieved.

[Second Embodiment]
FIG. 5 is a longitudinal sectional view showing a second embodiment of the accumulator according to the present invention. Also in FIG. 5, the plate-like rib 36 of the outflow pipe 30 is omitted as in FIG.

  The accumulator 2 of the illustrated second embodiment is different from the accumulator 1 of the first embodiment only in the configuration of the impact mitigating member 20, and the other configurations are the same. In FIG. 5 showing the accumulator 2 of the second embodiment, common reference numerals are given to portions corresponding to the respective portions of the accumulator 1 of the first embodiment. That is, in the accumulator 1 according to the first embodiment, the impact reducing member 20 provided on the back surface of the gas-liquid separator 18 is formed of a porous body in order to reduce the impact on the gas-liquid separator 18 due to the bumping phenomenon. However, in the accumulator 2 of the second embodiment, the impact relaxation member 60 is formed of an elastic body.

  That is, on the back surface of the gas-liquid separator 18 in the accumulator 2 of the second embodiment, the back surface of the gas-liquid separator 18 (specifically, the lower surface of the ceiling portion 18a and the inner peripheral surface of the peripheral wall portion 18b). An impact mitigating member 60 made of an elastic body having an inverted concave cross section provided with an insertion hole 61 through which the outflow pipe 30 (the inner pipe 31) passes is arranged along the line. The impact relaxation member 60 (elastic body) is made of, for example, a resin material such as rubber and is fixed to the back surface of the gas-liquid separator 18 by baking or the like. Here, the recess 62 in the impact relaxation member 60 (elastic body) is formed by the space below the gas-liquid separator 18 in the tank 10, the inner pipe 31 of the outflow pipe 30, and the outer pipe 32 (the upper end portion thereof). A communication space communicates with the formed opening (opening on the other end side of the outflow pipe 30).

  In the accumulator 2 of the second embodiment having such a configuration, an impact relaxation member 60 made of an elastic body is provided on the back surface of the gas-liquid separator 18, and when a bumping phenomenon occurs in the tank 10, The elastic body provided on the back surface of the gas-liquid separator 18 is compressed and deformed by a part of the boiled liquid-phase refrigerant (see FIG. 6). Therefore, the impact on the gas-liquid separator 18 due to the bumping phenomenon is alleviated, and the vibration of the gas-liquid separator 18 is suppressed, so that substantially the same effect as the accumulator 1 of the first embodiment can be obtained.

[Modification of First and Second Embodiments]
In the first and second embodiments, the countermeasure for suppressing (the magnitude of) the impact sound accompanying the bumping phenomenon has been described. However, the Japanese Patent Application No. 2015 by the present inventor for the countermeasure in the first and second embodiments. It is confirmed that the impact noise (amplitude) associated with bumping phenomenon can be more effectively suppressed by applying various countermeasures (measures for suppressing bumping phenomenon and the accompanying impact noise) described in the specification Has been.

  7 and 10 show an example (FIG. 7 is a modification of the first embodiment, and FIG. 10 is a modification of the second embodiment).

  In the accumulator 1A shown in FIG. 7 and the accumulator 2A shown in FIG. 10, an annular projection 13a that is the starting point of boiling (bubble generation) is pressed on the bottom 13 (inner surface) of the bottomed cylindrical tank 10. A plurality (seven in the illustrated example) are formed on the concentric circles by cutting or cutting (particularly, see FIG. 8).

  Further, the outer pipe 32 constituting the outflow pipe 30 is provided with a knurled portion 37 in which a plurality of protrusions serving as starting points of boiling are formed on the outer periphery by knurling. In this example, the knurled portion 37 is provided from the lower end to the upper end of the outer pipe 32 (over the vertical direction).

  The protrusions of the knurled portion 37 of the outer pipe 32 and the protrusions 13a on the inner surface of the bottom portion 13 of the tank 10 are sharply formed at their tips in order to promote boiling.

  Further, a cloth-like body 90 such as a felt or a mesh-like flexible or elastic plate-like body is provided so as to cover the entire area of the outer pipe 32 (the knurled portion 37) on the outer periphery of the upper portion of the strainer 40. Is wound or extrapolated. In addition, it may replace with the cloth-like body 90 and a foaming material may be used and what uses the synthetic resin, rubber | gum, ceramic, etc. which are marketed as a raw material can be used as a foaming material.

  Further, with respect to the accumulator 1 of the first embodiment and the accumulator 2 of the second embodiment, the bag 50 containing the desiccant M is removed, and the outer pipe 32 (the knurled portion 37 thereof) is attached to the cloth-like body 90 such as felt. ) Is provided on the outer periphery of the pipe, and a cylindrical desiccant storage portion 95 with a closed top and bottom for storing the desiccant M for absorbing and removing moisture in the refrigerant is provided. Is provided.

  The desiccant storage portion 95 is provided on the outer side of the outer pipe 32 on the inlet 15 side along the vertical direction (the axial direction of the outer pipe 32) (see particularly FIG. 9). Further, here, the desiccant storage portion 95 is provided from the upper end portion to the lower end portion of the pipe extrapolation portion 92 (in other words, from the portion above the strainer 40 of the outer pipe 32 to the upper end portion), The upper part protrudes above the position of the highest liquid level of the liquid portion (liquid refrigerant and oil) that accumulates in the tank 10 when the compressor 210 is stopped.

  Note that the hole diameter of the insertion hole 21 of the impact relaxation member 20 shown in FIG.

  The pipe extrapolation portion 92 of the cloth-like body 90 includes a plurality of (in the illustrated example, a total of six locations on the front side and the back side in the drawing in three locations at regular intervals in the vertical direction) in the horizontal direction. A slit (cut) 90s is formed.

  In the accumulator 1A shown in FIG. 7 and the accumulator 2A shown in FIG. 10, the accumulator 1A, which is substantially the same as the accumulator 1 of the first embodiment and the accumulator 2 of the second embodiment, can be obtained. In a portion immersed in the liquid portion (liquid refrigerant and oil) accumulated in the tank 10 in 2A, a protrusion (a protrusion of the knurled portion 37 of the outer pipe 32 or a protrusion 13 of the bottom portion 13 of the tank 10) that becomes the starting point of boiling (bubble generation). An upper surface protrusion 13a) is provided, and when the compressor 210 is started, before the bumping phenomenon and the accompanying impact sound are generated, the protrusion becomes a starting point (trigger) when the liquid phase refrigerant boils and vaporizes. As the pressure in the tank 10 decreases, the liquid-phase refrigerant gradually boils (small boiling smaller than bumping). That is, the protrusion promotes the occurrence of boiling smaller than bumping before reaching a predetermined pressure at which bumping phenomenon with impact noise occurs, and the boiling of the liquid phase refrigerant proceeds slowly. It is possible to effectively suppress the bumping phenomenon at the time and the generation of the impact sound associated therewith.

  In this case, basically, only the outflow pipe 30 (the outer pipe 32) and the tank 10 in which the projections are formed inexpensively and simply by pressing, cutting, knurling or the like may be prepared. Thus, 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, and the like as the stirring means, the configuration of the accumulator can be simplified, and the cost can be reduced and the size can be reduced. Etc. can be achieved.

  Further, a protrusion (protrusion of the knurled portion 37 of the outer pipe 32) provided on the outer pipe 32 by a cloth-like body 90 (or foam material) wound or extrapolated around the outer periphery of the outer pipe 32 constituting the outflow pipe 30. Since the refrigerant in contact with the refrigerant becomes sparse and the pressure is reduced, the protrusion formed on the outer pipe 32 becomes a starting point (trigger) when the liquid-phase refrigerant boils and vaporizes at the time of starting the compressor 210, and gradually. Bubbles are generated, that is, the liquid refrigerant is gradually vaporized. For this reason, the boiling of the liquid phase refrigerant proceeds slowly, and as a result, it is possible to more effectively suppress the bumping phenomenon in which the liquid phase refrigerant boils explosively and the occurrence of the impact sound.

  In this case, it is only necessary to add a simple configuration such as winding or extrapolating the cloth-like body 90 (or foamed material) around the outer pipe 32, so that it becomes complicated as in the conventional measures described above. Therefore, the cost is not increased, the size is not increased, and the cost effectiveness is extremely high.

  In addition, slits (slots) 90s formed in the cloth-like body 90 (the pipe extrapolated portion 92) trigger the boiling of the refrigerant, and the generated bubbles emerge outside them through the outer pipe 32 and the cloth-like body 90. It becomes easier and more effective.

  Further, since the cloth-like body 90 such as felt has air permeability and water permeability, the cloth-like body 90 such as felt absorbs moisture in the refrigerant in addition to the pipe extrapolation portion 92 as in this example. If the desiccant storage part 95 for storing the desiccant M for removal is provided, the desiccant storage part 95 serves as a bag. Therefore, a bag for separately storing the desiccant M and its fixing means (binding) It is no longer necessary to prepare a band etc., and the cost effectiveness is further enhanced.

  In addition, if the upper part of the desiccant storage unit 95 is positioned above the maximum liquid level, the bumping phenomenon and the associated impact noise when the compressor 210 is started up can be more reliably suppressed.

  In addition, please refer to Japanese Patent Application No. 2015-231052 for the detailed structure and effect of the deformation | transformation form shown by the above-mentioned FIGS. 7-9 and FIG.

  Although not shown in the drawing, the above-described impact mitigating member is included in the tank 10 (the lid member 12 that closes the cylindrical portion of the tank 10 and the upper surface opening of the tank 10) together with the back surface of the gas-liquid separator 18. You may provide in a surrounding surface (entire surface or its part). In that case, needless to say, it can be fixed to the inner periphery of the tank 10 by the same method as described in the first and second embodiments.

  Moreover, in the said 1st and 2nd embodiment, although the outflow pipe made into the double pipe structure which consists of an inner pipe and an outer pipe is employ | adopted, this invention is connected to an outflow port, and the other end Needless to say, the present invention can also be applied to an accumulator having an outflow pipe such as a U-shape in which the side opening is positioned near the lower surface of the gas-liquid separator.

1 Accumulator (first embodiment)
1A accumulator (variation of the first embodiment)
2 Accumulator (second embodiment)
2A accumulator (variation of the second embodiment)
DESCRIPTION OF SYMBOLS 10 Tank 12 Lid member 13 Tank bottom part 13a Tank bottom projection 15 Inlet 16 Outlet 18 Gas-liquid separator 18a Ceiling part 18b Peripheral wall part 19 Through hole 20 Impact mitigating member (porous body)
21 Insertion hole 30 Outflow pipe 31 Inner pipe 32 Outer pipe 35 Oil return hole 36 Plate-like rib 37 Knurled part 40 Strainer 50 Bag 60 Impact mitigating member (elastic body)
61 Insertion hole 62 Recess 90 Cloth 90s Slit 92 Pipe extrapolation part 95 Desiccant storage part M Desiccant

Claims (6)

A tank provided with an inflow port and an outflow port; an outflow pipe having one end connected to the outflow port and having the other end opened in the tank; and the lower end of the inflow port so as to cover the other end side opening. An accumulator comprising a cap-shaped or inverted thin bowl-shaped gas-liquid separator fixedly disposed on the side,
An accumulator characterized in that an impact mitigating member made of a porous body or an elastic body is provided on the back surface of the gas-liquid separator in order to mitigate an impact on the gas-liquid separator due to a bumping phenomenon.   The accumulator according to claim 1, wherein the porous body is made of a foam material or a blocky fiber material.   The accumulator according to claim 1 or 2, wherein the impact relaxation member is provided along a back surface of the gas-liquid separator. 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 any one of claims 1 to 3, wherein the impact relaxation member is provided with an insertion hole through which the outflow pipe passes.   5. The communication space according to claim 1, wherein a communication space that communicates a space below the gas-liquid separator in the tank and the opening on the other end side is formed in the impact relaxation member. An accumulator according to claim 1.   The accumulator according to any one of claims 1 to 5, wherein the shock absorbing member is further provided on an inner peripheral surface of the tank.

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