JP6514981B2 - accumulator - Google Patents

Description

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

  Generally, a heat pump system 200 constituting a car air conditioner etc. is added to a compressor 210, an outdoor heat exchanger 220, an indoor heat exchanger 230, an expansion valve 260, a four-way switching valve 240 etc. as illustrated in FIG. , Accumulator 250 is provided.

  In the 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. At this time, the outdoor heat exchanger 220 works as a condenser, and the indoor heat exchanger 230 works as an evaporator. On the other hand, during heating operation, the refrigerant is circulated in a cycle as shown in FIG. 7B, and at this time, the outdoor heat exchanger 220 works as an evaporator and the indoor heat exchanger 230 works as a condenser. In either operation, a 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) through the four-way switching valve 240.

  As the accumulator 250, for example, as described in Patent Document 1 etc., a bottomed cylindrical tank whose top opening is airtightly closed by a lid member provided with an inlet and an outlet, and the inner diameter of this tank A smaller diameter bowl-like or inverted thin bowl-like gas-liquid separator, an outlet pipe having a double-pipe structure consisting of an inner pipe and an outer pipe whose upper end is connected to the outlet and suspended, the outer pipe It is known to have a liquid-phase refrigerant and a strainer or the like provided in the vicinity of the bottom of the pipe) for capturing and removing foreign substances contained in oil (refrigerant 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) has an inner peripheral surface of the tank. As it flows down and accumulates in the lower part of the tank, the gas-phase refrigerant descends the space (gas-phase refrigerant lower flow path) formed between the inner pipe and the outer pipe in the outflow pipe, It rises and is sucked to the suction side of the compressor 210 and circulated.

  In addition, the oil that accumulates in the lower part of the tank together with the liquid phase refrigerant has a difference in properties with the liquid phase refrigerant, and in addition to that, when the specific gravity of the oil is larger than the specific gravity of the liquid phase refrigerant, factors such as the specific gravity It moves to the bottom of the tank and is sucked by the gas-phase refrigerant sucked to the suction side of the compressor via the outflow pipe, and is formed at the bottom of the strainer (the mesh filter of the strainer) → the outflow pipe (outer pipe) From the oil return hole to the inner pipe space of the outflow pipe, the gas phase refrigerant is returned to the compressor suction side and circulated. When passing through the mesh filter, foreign matter such as sludge is captured, and the foreign matter is removed from the circulating refrigerant (including oil). The flows of the liquid-phase refrigerant and the oil are substantially the same as described above even when the specific gravity of the oil is smaller than the specific gravity of the liquid-phase refrigerant.

  In addition, among accumulators as described above, for example, as described in Patent Document 2, there is known one in which a bag containing a desiccant for absorbing and removing the water in the refrigerant is disposed in a tank.

JP, 2014-70869, A JP, 2014-202440, A

  By the way, in the accumulator described in Patent Document 2, in order to prevent the rotation and movement of the desiccant-containing bag in the tank, the bag is wound around the outer pipe, and a binding band or the like is attached to the outer pipe. Measures have been taken to fix by winding. However, such a measure is time-consuming, troublesome, and has a problem that parts cost and assembly cost become high.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an accumulator capable of easily and easily fixing a desiccant-containing bag, thereby reducing part cost and assembly cost. It is to provide.

In order to achieve the above object, an accumulator according to the present invention basically comprises: a tank closed by a lid member provided with an inlet and an outlet; and a reservoir connected to the outlet and suspended in the tank An outer pipe having a double pipe structure including an outer pipe disposed on the outer periphery of the inner pipe and a dried inner pipe, and a desiccant-containing bag for absorbing and removing water in the refrigerant; A tubular portion for bag insertion into which the desiccant-containing bag is inserted is provided on the outer side of the sleeve, and the outer pipe and the tubular portion for bag insertion have a peripheral wall portion in which a part of them is common. It is characterized in that it is integrally molded to become .

  The desiccant-containing bag is preferably inserted into the bag-inserting cylindrical portion in a press-fitting manner.

  Preferably, slit-like notches are formed in the vertical direction in the cylindrical portion for bag insertion.

  In a preferred embodiment, the upper end portion and / or the lower end portion of the desiccant-containing bag is exposed from the bag-insertion tubular portion.

  In another preferred embodiment, a gas-liquid separator is provided on the upper side of the outer pipe, and the desiccant-containing bag is disposed so as to be stretched between the gas-liquid separator and the bottom of the tank.

  In the accumulator according to the present invention, the outer pipe is provided with the cylindrical portion for bag insertion into which the desiccant-containing bag is inserted with a slight pressure, so that the bag is wound around the outer pipe as in the prior art. As compared with the case where a binding band or the like is wound and fixed around the outer circumference, the desiccant-containing bag can be fixed easily and easily, and parts cost and assembly cost can be reduced.

  In addition, the desiccant-containing bag to be inserted into the bag-insertion tubular portion is disposed so as to be tensioned between the gas-liquid separator provided on the upper side of the outer pipe and the bottom of the tank, and as a result, drying It is also possible to prevent pulverization and powderization of the agent, and thus the desiccant from leaking out of the desiccant-containing bag through the minute gaps of the desiccant-containing bag.

BRIEF DESCRIPTION OF THE DRAWINGS The partial notch front view which shows 1st Embodiment of the accumulator which concerns on this invention. FIG. 2 is an enlarged cross-sectional view taken along the line U-U in FIG. The principal part expansion half sectional view showing the circumference of the strainer in the accumulator of a 1st embodiment. FIG. 5 is a cross-sectional view taken along line V-V in FIG. 3. The partial notch front view which shows 2nd Embodiment of the accumulator which concerns on this invention. FIG. 6 is an enlarged cross-sectional view taken along the line U-U in FIG. 5; An example of a heat pump system is shown, (A) is a schematic block diagram which shows the refrigerant flow (cycle) at the time of air conditioning operation, (B) is a schematic block diagram which shows the refrigerant flow (cycle) at the time of heating operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First Embodiment
FIG. 1 is a partially cutaway front view showing a first embodiment of an accumulator according to the present invention, and FIG. 2 is an enlarged sectional view taken along the line U-U in FIG.

  The accumulator 1 according to the first embodiment is, for example, used as an accumulator 250 in a heat pump system 200 constituting a car air conditioner for electric vehicles as shown in FIG. 7 described above, and is made of metal such as stainless steel or aluminum alloy. A bottomed cylindrical tank 10 is provided, and the top opening of the tank 10 is airtightly closed by a lid member 12 made of the same metal. The accumulator 1 according to the present embodiment is, for example, vertically disposed as illustrated, that is, the lid member 12 is on the upper side and the bottom of the tank 10 is on the lower side.

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

  An upper end portion of the outflow pipe 30 is connected to a lower portion of the outflow port 16 by caulking or press-fitting, and the metal inner pipe 31 suspended in the tank 10 is disposed on the outer periphery of the inner pipe 31. It has a double-pipe structure consisting of an outer pipe 32 with a bottom made of synthetic resin, and as described later, a bag interpolation for interposingly fixing the desiccant M-containing bag 50 to the outer side of the outer pipe 32 is performed. The cylindrical portion 37 is integrally formed.

  The lower end portion of the outer pipe 32 is internally fitted and fixed to an upper portion 42 a with an inner circumferential step in a case 42 of a strainer 40 described later. 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 lower than the lid member 12. An oil return hole 35 is formed in the center of the bottom 32 b of the outer pipe 32. The hole diameter of the oil return hole 35 is set to, for example, about 1 mm.

  Inside the outer pipe 32, along the longitudinal direction (vertical direction), and as the cross section thereof is shown in FIG. 2, three plate-like ribs 36 are directed radially inward at equal angular intervals. The inner pipe 31 is inserted and fixed on the inner peripheral side of the three plate-like ribs 36 in a manner of press-fitting.

  Near the upper end of the inner pipe 31, there is provided a bowl-shaped portion 31f compressed and bent by bulging or the like. When assembling the gas-liquid separator 18 and the inner pipe 31 to the lid member 12, the upper end portion of the inner pipe 31 is passed through the through hole 19 provided in the gas-liquid separator 18 and pressed into the outlet 16 from the lower side. Fix the pipe expansion. Thus, the gas-liquid separator 18 is held and fixed on the upper side of the outer pipe 32 so as to be held between the bowl-shaped portion 31 f and the lower end surface of the lid member 12.

  The inner pipe 31, the outer pipe 32, and the plate-like rib 36 may be integrally molded using a metal such as aluminum or a synthetic resin material. For this molding, for example, a technique of extrusion molding can be adopted.

  The strainer 40 is placed on and fixed to the bottom of the tank 10, and as shown in FIGS. 3 and 4, the bottomed cylindrical case 42 made of a synthetic resin and the case 42 with an insert may be inserted. It consists of a cylindrical mesh filter 45 integrated by molding. The mesh filter 45 is made of, for example, a wire mesh, a synthetic resin mesh material, or the like. 3 and 4 do not show the desiccant M-containing bag 50 and the bag insertion cylindrical portion 37 described later.

  The case 42 of the strainer 40 is provided with an upper portion 42a with a step on the inner periphery and a bottom plate portion 42c, in which the lower end portion of the outer pipe 32 is fixedly fitted. And an annular belt-like mesh end embedded portion 42d having a predetermined thickness and width including the upper end portion and the lower end portion of the columnar portion 42b. The upper and lower end portions of the mesh filter 45 are integrated and sealed in the upper and lower mesh end embedded portions 42d, 42d at the time of insert molding, and the columnar portion 42b in the mesh filter 45 is also inserted at the time of insert molding It is integrated and sealed to 42b. In other words, four windows 44 having a rectangular shape in a side view are defined by the four columnar parts 42b and the upper and lower mesh end embedded parts 42d, 42d, and the mesh filter 45 is stretched on the respective windows 44. become. The four columnar portions 42b are provided with a slope for die removal, but the widths in the radial direction of the four columnar portions 42b and the upper and lower metal mesh embedded portions 42d and 42d are substantially equal.

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

  Further, the oil accumulated 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 the property with the liquid phase refrigerant, and the compressor suction side via the outflow pipe 30 The refrigerant is drawn into the gas-phase refrigerant sucked into the air flow through the inner space of the mesh filter 45 → oil return hole 35 → inner pipe 31 of the strainer 40 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 the present embodiment, a cylindrical bag for bag interpolation having an open top and bottom for inserting and fixing the desiccant M-containing bag 50 to the outer portion of the outer pipe 32 with a slight press fit. The portion 37 is formed integrally with the outer pipe 32 by extrusion molding.

  In detail, the cylindrical portion 37 for bag insertion has a crescent to crescent shape in cross section, and the outer pipe 32 and the cylindrical portion 37 for bag insertion have a part of the peripheral wall common to them. For example, a half of the outer pipe 32 (a semicircular cross-section located on the center side of the tank 10) is the inner wall 37a of the bag-inserting tubular portion 37, and the outer wall of the bag-inserting tubular 37 The portion 37 b has an oblong cross-section outer shape including the same cross-section semi-circular portion as the inner wall portion 37 a.

  In addition, the cylindrical portion 37 for bag insertion is positioned approximately at the center of the tank 10, the upper end thereof is positioned at the same position as the upper end of the outer pipe 32, and the lower end thereof is slightly above the lower end of the outer pipe 32. positioned.

  On the other hand, the bag 50 housed in the bag inflating tubular portion 37 is made of a cloth-like body such as felt having air permeability / water permeability and required shape retention, and the desiccant M in the form of particles is contained therein. Is almost full. In order to fix the desiccant M-containing bag 50, the desiccant M-containing bag 50 may be pressed into the bag intercalating tubular portion 37. That is, when the desiccant M-containing bag 50 is pushed into the bag-insertion tubular portion 37, most of the bag except the upper and lower end portions of the cross-sectionally triangular shape is substantially the inner peripheral surface of the bag-insertion tubular portion 37. It is inserted in a press-in feeling and firmly fixed so as to press against the entire area.

  Further, in the present embodiment, in a state where the desiccant M-containing bag 50 is inserted and fixed to the bag-insertion tubular portion 37, the upper and lower end portions of the desiccant M-containing bag 50 So that the upper end is in pressure contact with the ceiling surface of the gas-liquid separator 18 and the lower end is in pressure contact with the tank bottom 13, in other words, the desiccant M is exposed in order to enhance the stability and vibration resistance. The dimensions and shape of each part are set so that the entry bag 50 is stretched between the gas-liquid separator 18 and the tank bottom 13. Thereby, the vibration of the desiccant M-containing bag 50 in the tank 10 can be prevented, and as a result, the desiccant M can be effectively prevented from being crushed or powdered, and the desiccant M can Leakage from the bag 50 can be prevented.

  Furthermore, in the accumulator 1 of the present embodiment, the maximum liquid level position Hmax of the liquid portion composed of the liquid-phase refrigerant and the oil, which is accumulated in the tank 10 when the compressor is stopped, is the cylindrical portion 37 for bag insertion. The height of the desiccant M-containing bag 50 is about 1⁄2 to 3⁄5 from the bottom of the bag M with the desiccant M inserted and fixed, and the upper portion of the desiccant M-containing bag 50 has the maximum liquid level Hmax. It is located above.

  As described above, in the accumulator 1 of the present embodiment, the bag-insertion tubular portion 37 in which the desiccant M-containing bag 50 is inserted into the outer pipe 32 in an intrusive manner is integrated with the outer pipe 32. Since it is molded, the bag containing desiccant M can be easily and easily compared to the conventional case where the binding band etc. is wound around the outer periphery of the outer pipe and fixed. It can be fixed firmly, reducing parts cost and assembly cost.

Second Embodiment
FIG. 5 is a partially cutaway front view showing a second embodiment of the accumulator according to the present invention, and FIG. 6 is an enlarged sectional view taken along the line U-U in FIG.

  In contrast to the accumulator 1 of the first embodiment, the accumulator 2 of the second embodiment has a slit-like shape in the vertical direction (the axial direction of the outer pipe 32) in the center of the outer wall 37b of the cylindrical portion 37 for bag insertion. The only difference is the configuration in which the notch 38 is formed, and the other configurations are the same. In FIGS. 5 and 6 showing the accumulator 2 of the second embodiment, parts corresponding to the respective parts of the accumulator 1 of the first embodiment are denoted by the same reference numerals.

  As described above, by forming the slit-shaped cutout 38 in the bag-insertion tubular portion 37, the desiccant M-containing bag 50 is inserted into the bag-insertion tubular portion 37 in a press-fitting manner. In this case, since the bag intercalating tubular portion 37 is easily elastically deformed (expanded), the desiccant M-containing bag 50 can be easily inserted, and the exposed area of the desiccant M-containing bag 50 is increased. The effect of promoting the absorption of water is obtained.

  In the above embodiment, although the bag-insertion tubular portion 37 and the outer pipe 32 are integrally formed so that a part of them is a common peripheral wall portion, the configuration is limited to such a configuration. Instead, the cylindrical portion 37 for bag insertion and the outer pipe 32 may be formed independently (separately).

  Further, in the above embodiment, the desiccant M-containing bag 50 is inserted into the bag-insertion tubular portion 37 in a manner of being press-fitted and firmly fixed, but the desiccant M-containing bag 50 is not moved As a matter of course, it is sufficient to simply interpolate.

  Furthermore, the accumulators 1 and 2 according to the above embodiments can be applied to a refrigeration cycle using HFO 1234 yf or HFC 134 a as a refrigerant and POE oil (having a specific gravity smaller than that of the above-described refrigerant) as an oil. It goes without saying that it can be used also for a refrigeration cycle using a refrigerant or oil, and the relationship between the specific gravity of the refrigerant and the oil may be reversed from the above.

1 Accumulator (first embodiment)
2 Accumulator (2nd embodiment)
DESCRIPTION OF SYMBOLS 10 Tank 12 lid member 15 inflow port 16 inflow port 18 gas-liquid separation body 30 outflow pipe 31 inner pipe 32 outer pipe 37 cylindrical part for bag fixation 38 slit-like notch part 40 strainer 50 bag containing desiccant M desiccant

Claims (5)

A tank closed by a lid member provided with an inlet and an outlet, 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 A double-piped outlet pipe, and a desiccant-containing bag for absorbing and removing moisture in the refrigerant,
A tubular portion for bag insertion into which the desiccant-containing bag is inserted is provided at the outer side of the outer pipe .
An accumulator, wherein the outer pipe and the bag-insertion tubular portion are integrally formed so that a part of them is a common peripheral wall portion . The accumulator according to claim 1 , wherein the desiccant-containing bag is inserted into the bag-inserting cylindrical portion in a manner of being press-fitted. The accumulator according to claim 1 or 2 , wherein a slit-like notch is formed in the vertical direction in the cylindrical portion for bag insertion. The accumulator according to any one of claims 1 to 3 , wherein the upper end portion and / or the lower end portion of the desiccant-containing bag is exposed from the bag-insertion tubular portion. A gas-liquid separator is provided above the outer pipe,
The accumulator according to any one of claims 1 to 4 , wherein the desiccant-containing bag is disposed so as to be stretched between the gas-liquid separator and the bottom of the tank.

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