JP2019078418A - accumulator - Google Patents

Abstract

To provide an accumulator capable of easily connecting pipes, being miniaturized, and rationally supporting and fixing an outflow pipe of a double pipe structure in a main body tank made of iron without taking time, to suppress component costs, processing assembling costs and the like.SOLUTION: A main body tank 10 has a cylindrical iron body 11, an iron cover body 12 having an outflow port 16 at a center and an inflow port 15 at its side, is fixed to a longitudinal one end side of the body 11 by welding, brazing and the like, and an iron bottom body 13 is fixed to the longitudinal other end side of the body 11 by welding, brazing and the like. An inner pipe 31 is vertically suspended from the outflow port 16, and an outer pipe 32 is supported and fixed by the main body tank 10 in a state that its one end is positioned at a lower side of a top face 12a of the cover body 12 at a prescribed distance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an accumulator used for a heat pump type refrigeration cycle (hereinafter referred to as a heat pump system) such as an air conditioner or a refrigerator, and more particularly to an accumulator whose main body tank is made of iron.

  The body tank of the accumulator used for the heat pump system is often made of aluminum for weight reduction when the application is for a car (car air conditioner), but in other applications it is cost and other aspects It is often made of iron.

  When making the main body tank of the accumulator into iron, it is difficult to make a bottomed cylindrical body by deep drawing like aluminum, so as can be seen also in Patent Document 1, for example, a cylindrical iron body At both ends in the longitudinal direction, an iron lid having an inlet and an iron bottom having an outlet are respectively joined and fixed by brazing or welding. When the body tank is made of iron, a copper inflow pipe is fixed to the inflow port of the lid by brazing or the like, and the outflow port of the bottom body has a copper outflow pipe, one end of which is in a predetermined position in the body tank. It is a general practice to fix the other end by brazing or the like in a state where it is reached.

  As an accumulator, for example, as disclosed in Patent Document 2, a lid provided with an inlet and an outlet is fixed so as to airtightly close the top opening of the bottomed cylindrical main body tank, It is also known that one end of a copper U-shaped outflow pipe is fixed to the outlet of the lid. In this accumulator, the U-shaped portion (almost all) of the outflow pipe is accommodated in the main tank.

  Furthermore, as an accumulator, for example, as disclosed in Patent Document 3, an inlet and an outlet are provided on a lid, and an inner pipe having an upper end fixed to the outlet instead of the U-shaped outlet pipe ( It is also known to have a double-piped outflow pipe consisting of an inner pipe) and an outer pipe (outer pipe) disposed on the outer periphery of the inner pipe. The inner and outer tubes of the double-piped outlet pipe are often both made of aluminum, and they are integrally manufactured by extrusion as shown in the above-mentioned Patent Document 3, or they are separately prepared. It is general to integrate by a method such as press fitting after production. In addition, a strainer is usually provided between the lower end of the (outer pipe) of the double-piped outflow pipe and the bottom of the main tank to capture and remove foreign matter contained in the refrigerant and oil mixed in it. Provided.

Unexamined-Japanese-Patent No. 5-1867 JP 2002-5545 A JP, 2012-225519, A

  However, in the accumulator described in Patent Document 1 described above, since it is necessary to provide the inflow pipe and the outflow pipe on the lid and the bottom fixed to both ends of the iron body in the longitudinal direction, respectively, the arrangement of the accumulator and piping connection In addition to the difficulty, the occupied space is increased, and the design and layout of the system are restricted.

  Further, in the accumulator described in Patent Document 2 described above, since the inlet and the outlet are provided in the lid, the arrangement and piping connection of the accumulator become easy, while the bending radius of the U-shaped portion of the outflow pipe is Considering the material, the tube diameter, etc., it can not be made very small, so it is difficult to miniaturize the accumulator (the outer diameter of the main tank).

  When the outflow pipe is a double pipe made of nonferrous metal such as aluminum as in the accumulator described in Patent Document 3 above, the outflow pipe is a main body tank made of iron (a lid and a bottom are In order to be placed (supported and fixed) in a predetermined position in the jointed by welding or the like, a special device is required.

  That is, the method of directly welding the iron body, the lid and the bottom body that constitute the main body tank can not be used for the outflow pipe made of nonferrous metal (in particular, the outer pipe thereof). In addition, when manufacturing an accumulator having an iron main tank, the structure of the accumulator requires welding the lid and the bottom to the fuselage with the double-piped outlet pipe inserted, and welding Since the outlet pipe (outer pipe) inside can not be touched substantially after welding, the outlet pipe (outer pipe) is firmly supported in place in the main tank when the lid and bottom body are welded to the body It is required to be fixed. Similarly, special arrangements are required for the placement (supporting and fixing) of the strainer.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to facilitate pipe connection and the like and to miniaturize, and an outflow pipe with a double pipe structure in an iron main tank. The present invention is to provide an accumulator capable of rationally supporting and fixing without taking time, thereby making it possible to keep parts costs, processing and assembly costs low.

  In order to achieve the above object, the accumulator according to the present invention basically comprises: a main tank; and an outlet pipe of a double pipe structure comprising an inner pipe and an outer pipe disposed on the outer periphery of the inner pipe. The main body tank has a cylindrical iron body, an iron lid and a bottom body are fixed to both ends in the longitudinal direction of the body, and the lid is provided with an inlet and an outlet. The inner pipe is suspended from the outlet, and the outer pipe is supported and fixed to the main tank with one end thereof positioned below the top surface of the lid by a predetermined distance. There is.

  In a preferred aspect, the inner pipe is integrated with an outlet pipe extended from the outlet to the outside of the lid.

  In another preferred embodiment, a bowl-shaped or inverted thin bowl-shaped gas-liquid separator having a diameter smaller than the inner diameter of the main tank is disposed below the top surface of the lid.

  In a further preferred aspect, the gas-liquid separator covers the one end side opening formed by the inner pipe and the one end of the outer pipe.

  In another preferred embodiment, an oil return hole is provided at the bottom of the outer pipe, and a strainer having a metal mesh filter is provided to cover the oil return hole.

  In a further preferred embodiment, the lower end of the strainer abuts or presses against the bottom body.

  In a further preferred aspect, the outer tube is provided with the strainer.

  In another preferable aspect, the outer tube is an outer circumferential annular portion sandwiched between the body and the lid or the bottom, an inner circumferential annular portion externally fitted to the outer tube, and the outer circumferential annular portion. It is supported by the fixed plate which has a plurality of radial connection parts which connect it and the above-mentioned inner ring part.

  In a further preferable aspect, a thin-walled small-diameter portion is formed so that a step portion is generated in the outer pipe, and the inner circumferential annular portion of the fixing plate is externally fitted to the thin-walled small-diameter portion. It is locked to the annulus.

  In a further preferred aspect, the fixing plate is provided with the strainer.

  In another preferable aspect, an inflow pipe performing gas-liquid separation is fixed to the inflow port of the lid by spouting a refrigerant along an inner circumferential surface of the main tank to generate a swirling flow.

  In the accumulator according to the present invention, since the lid is provided with the inlet and outlet, piping can be easily connected as compared with the conventional case where they are separately provided for the lid and the bottom, and By making the outflow pipe not a U-shaped one but a double pipe structure, downsizing and the like can be achieved.

  Also, for example, the upper part of the outer pipe is supported by the upper fixing plate held between the body and the lid, and the lower part of the outer pipe is held by the lower fixing plate held between the body and the bottom. Since it is supported, the double-piped outflow pipe can be rationally firmly supported and fixed at a predetermined position in the main body tank made of iron, without any trouble, and as a result, parts cost, processing and assembly cost, etc. It can be kept low.

The 1st Embodiment of the accumulator which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is an AA arrow sectional view of (A), (C) is an BB arrow of (A). Cross section. The 2nd Embodiment of the accumulator which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is CC arrow sectional drawing of (A). The 3rd Embodiment of the accumulator which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is a BB arrow sectional view of (A). The 4th Embodiment of the accumulator which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is a BB arrow sectional view of (A). The 5th Embodiment of the accumulator which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is a BB arrow sectional view of (A). The other example (The state before strainer attachment) of the double pipe structure used for the 1st and 2nd embodiment of the accumulator concerning the present invention is shown, (A) is a partial notch side view, (B) is (U) Arrow enlarged sectional view of (A).

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

First Embodiment
1 (A) to 1 (C) show a first embodiment of an accumulator according to the present invention, FIG. 1 (A) is a longitudinal sectional view, and FIG. 1 (B) is an arrow AA of FIG. 1 (A). FIG. 1C is a sectional view taken along the line B-B in FIG. 1A.

  The accumulator 1 of the illustrated first embodiment is used, for example, in a heat pump system constituting a room air conditioner or the like, and includes a main body tank 10 and an outflow pipe 30 having a double pipe structure.

  The main body tank 10 has a cylindrical iron body 11, and on the one end side (upper side) and the other end side (lower side) of the body 11 in the longitudinal direction, a bowl-like iron lid 12 and a bottom body 13 Are respectively fixed by welding, brazing or the like (welding part or brazing part J). An outlet 16 and an inlet 15 are juxtaposed in the lid 12. Specifically, an outlet 16 is provided at the center of the lid 12 and an inlet 15 is provided beside the outlet 16.

  In addition, the accumulator 1 of this embodiment is vertically disposed as shown in the figure, that is, with the lid 12 on the upper side and the bottom 13 on the lower side, welding is performed on the lower surface of the bottom 13. It is installed by screwing the joined bracket 48 made of, for example, iron to the unit.

  The outflow pipe 30 of the double pipe structure is composed of an inner pipe 31 and a bottomed outer pipe 32 disposed on the outer periphery of the inner pipe 31. The inner pipe 31 is made of, for example, copper, is suspended from the outlet 16, and is integrated with an outlet pipe 36 extending from the outlet 16 to the outside (upper side) of the lid 12. Just below the top surface 12 a of the lid 12 of the inner pipe 31, an annular protrusion 31 f compressed and bent by bulge forming or the like is provided.

  Further, the main body tank 10 is covered with an annular opening (one end side opening) formed by the inner pipe 31 and the upper end of the outer pipe 32 below the top surface 12 a of the main body tank 10 (lid 12). A bowl-like or inverted thin bowl-like gas-liquid separator 18 made of, for example, SUS, having a diameter slightly smaller than the inner diameter of the lid 10 (the lid 12) is disposed.

  When assembling the gas-liquid separator 18 and the inner pipe 31 to the lid 12, the upper part (the part including the outlet pipe 36) of the inner projection 31 f of the annular pipe 31 is provided at the center of the gas-liquid separator 18. It passes through the through hole 18a and is pressed into the outlet 16 from the lower side, and the part passed through the inlet 16 is fixed by brazing or the like. Thus, the gas-liquid separator 18 is held and fixed so as to be sandwiched between the annular protrusion 31 f and the top surface 12 a of the lid 12, and the inner pipe 31 is fixed in a suspended state from the outlet 16. Ru. Further, an inflow pipe 35 made of, for example, copper is fixed to the inflow port 15 of the lid 12 by brazing or the like.

  A pressure equalizing hole 39 for preventing suction of liquid phase refrigerant at the time of system startup is provided in the vicinity of the annular projection 31f (in the illustrated example, a portion located inside the gas-liquid separator 18) in the inner pipe 31 There is.

  The outer tube 32 is made of, for example, aluminum (or made of SUS), and is manufactured to have a bottom by deep drawing. A downward convex portion is provided at the center of the bottom portion 32e of the outer pipe, and an oil return hole 45 is formed in the downward convex portion. Here, the hole diameter of the oil return hole 45 is set to, for example, about 1 mm.

  Under the bottom portion 32 e of the outer pipe 32, a strainer 40 made of, for example, a semispherical mesh filter made of metal such as SUS is provided so as to cover the oil return hole 45. More specifically, a ridged portion 40a is provided on the outer peripheral edge of the upper surface opening of the strainer 40, while a thin cylindrical caulking portion 32f is provided on the lower surface side outer peripheral edge of the bottom portion 32e of the outer tube 32 (FIG. 6). The strainer 40 is fixed to the bottom 32e of the outer tube 32 by caulking the thin cylindrical caulking portion 32f and pressing the flange 40a against the bottom 32e. The lower end of the strainer 40 is in contact with or pressed against the bottom surface 13 a of the bottom body 13.

  In the present embodiment, the inner pipe 31 is floated with respect to the outer pipe 32 so that the both are not in contact (in other words, the inner pipe 31 is inserted into the outer pipe 32 with a predetermined gap). It is not necessary to do this, for example, as shown in FIGS. 6 (A) and 6 (B), a plurality (for example, three) of the inner pipe 31 (or the outer pipe 32) may be radially emitted. Alternatively, the inner pipe 31 may be press-fitted into the outer pipe 32 to integrate them.

  The upper end of the outer tube 32 is positioned below the top surface 12 a of the lid 12 by a predetermined distance, and the lower end thereof is supported and fixed by a predetermined distance above the bottom surface 13 a of the bottom 13. In detail, the upper part of the outer tube 32 is supported by the upper fixed plate 21 made of, for example, SUS, and the lower part of the outer tube 32 is supported by the lower fixed plate 22 made of, for example, SUS. That is, here, the upper and lower portions of the outer tube 32 are supported by a pair of upper fixing plate 21 and lower fixing plate 22 of the same material and the same shape.

  The upper fixed plate 21 has an outer annular portion 21a and an outer pipe 32 (nearly held between the body 11 and the lid 12), as can be understood well with reference to FIG. 1 (B) in addition to FIG. Inner circumferential annular portion 21b having a short cylindrical portion externally fitted to the upper thin-walled small diameter portion 32a) and a wide ridge-like portion, and a plurality (in the illustrated example) connecting the outer circumferential annular portion 21a and the inner circumferential annular portion 21b 4) radial connection part 21c. The radial connection portion 21c is provided with a downward convex rib 21d.

  On the other hand, the lower fixing plate 22 has an outer peripheral annular portion 22a which is held between the body 11 and the bottom body 13 as shown in FIG. 1 (C), as well as FIG. 1 (C). An inner circumferential annular portion 22b having a short cylindrical portion externally fitted to (the lower thin small diameter portion 32b of) the tube 32 and a wide ridge-like portion, and a plurality of (two) connecting the outer circumferential annular portion 22a and the inner circumferential annular portion 22b In the illustrated example, four radial connecting portions 22c are provided. An upward convex rib 22d is provided on the radial connection portion 22c.

  Here, the upper thin portion small diameter portion 32a and the lower thin portion small diameter portion 32b are formed on the upper and lower portions of the outer tube 32 so that the step portions 32c and 32d respectively occur, and the upper thin portion small diameter portion 32a and the lower thin portion small diameter The inner peripheral annular portions 21b and 22b of the upper fixed plate 21 and the lower fixed plate 22 are externally fitted to the portion 32b, and the upper and lower stepped portions 32c and 32d of the outer tube 32 are engaged with the inner annular portions 21b and 22b, respectively. It has been stopped.

  Next, an example of a method of assembling the accumulator 1 having the above-described configuration will be described.

  First, the upper portion of the inner pipe 31 is fixed to the lid 12 by brazing or the like as described above, and the gas-liquid separator 18 and the inner pipe 31 are held and fixed to the lid 12. Fasten to 15 by brazing etc., and assemble the lid assembly.

  Further, the strainer 40 is fixed to the bottom 32 e of the outer pipe 32 as described above.

  Next, the inner peripheral annular portion 22b of the lower fixed plate 22 is lightly press-fit into the lower thin small diameter portion 32b, and the inner peripheral annular portion 22b is held in a state of being in contact with the step portion 32d.

  Next, the lower fixing plate 22 (the outer ring portion 22a thereof) held by the outer tube 32 is placed on the step 13c of the spread portion 13b of the bottom 13 (the upper opening of the bottom 13), With the outer peripheral annular portion 22a of the lower fixed plate 22 sandwiched between the lower end of the body 11 and the step 13c of the bottom body 13, the lower end portion of the body 11 is placed on the expanded portion 13b of the bottom body 13 Fix by welding, brazing etc. (welding part or brazing part J). As a result, the outer tube 32 is supported and fixed to the bottom 13 via the lower fixing plate 22 at its lower portion, and is erected.

  Subsequently, the inner peripheral annular portion 21b of the upper fixed plate 21 is lightly press-fitted to the upper thin walled small diameter portion 32a of the outer tube 32 in the upright state, and the inner peripheral annular portion 21b is brought into contact with the step portion 32c. As a result, the outer peripheral annular portion 21 a of the upper fixed plate 21 held by the outer tube 32 is placed on the upper end of the body 11.

  Next, as described above, the lid assembly already assembled is placed on the upper fixing plate 21 and fixed at the upper end of the body 11 and the step 12c by the expanded portion 12b of (the lower opening of the lid 12). The outer circumferential annular portion 21 a of the plate 21 is sandwiched. At this time, the inner pipe 31 is inserted into the outer pipe 32.

  Thereafter, the upper end portion of the body 11 is welded to the expanded portion 12 b of the lid 12 with the outer annular portion 21 a of the upper fixed plate 21 sandwiched between the upper end of the body 11 and the step 12 c of the lid 12. Fix by attachment (welding part or brazing part J). Thus, the outer pipe 32 is firmly supported and fixed at a predetermined position in the main tank 10, and the assembly of the accumulator 1 is completed.

  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 main tank 10 through the inflow pipe 35 → the inflow port 15 as in the conventional one. The introduced refrigerant collides with the lower gas-liquid separator 18 and is radially diffused to be separated into a liquid-phase refrigerant and a gas-phase refrigerant, and the liquid-phase refrigerant (including oil) is contained in the main tank 10 While flowing down along the circumferential surface and accumulating in the lower space of the main tank 10, the gas phase refrigerant is formed in the outflow pipe 30 between the inner pipe 31 and the outer pipe 32 (gas phase refrigerant lower feed channel →) It is sucked and circulated to the suction side of the compressor via the inner space of the inner pipe 31 (and the outlet pipe 36 integral therewith).

  Further, the oil accumulated in the lower space of the main tank 10 together with the liquid phase refrigerant moves to the bottom side (bottom 13 side) of the main tank 10 due to the difference in specific gravity and property with the liquid phase refrigerant, and contains much oil. The liquid-phase refrigerant on the bottom side is sucked little by little by the gas-phase refrigerant sucked to the compressor suction side through the outflow pipe 30 and strainer 40 (mesh filter) → oil return hole 45 → inner pipe 31 (and The gas-phase refrigerant is returned to the suction side of the compressor and circulated through the inner space of the integral outlet pipe 36). 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).

  In the accumulator 1 of this embodiment configured as described above, the inner pipe 31 including the outlet 16 and the outlet pipe 36 is provided at the center of the lid 12 and the inlet 15 and the inlet pipe 35 are provided on the side thereof. Therefore, piping connection etc. can be easily performed as compared with the case where they are separately provided to the lid and the bottom as in the conventional one, and the outflow pipe is not U-shaped but a double pipe structure As a result, downsizing and the like can be achieved.

  Further, the upper portion of the outer tube 32 is supported by the upper fixed plate 21 sandwiched between the body 11 and the lid 12, and the lower portion of the outer tube 32 is sandwiched between the body 11 and the bottom 13 Since it is supported by the lower fixing plate, the outflow pipe 30 of the double pipe structure can be rationally firmly supported and fixed at a predetermined position in the main body tank 10 made of iron without any trouble. As a result, parts cost, processing and assembly costs, etc. can be suppressed low.

Second Embodiment
2 (A) and 2 (B) show a second embodiment of the accumulator according to the present invention, FIG. 2 (A) is a longitudinal sectional view, and FIG. 2 (B) is a C-C arrow in FIG. 2 (A). FIG. In the accumulator 2 of the second embodiment, the parts corresponding to the respective parts of the accumulator 1 of the first embodiment are given the same or related reference numerals (such as with '), and the redundant description is omitted. To emphasize.

  In the accumulator 2 of the second embodiment, the gas-liquid separator 18 in the first embodiment does not exist, and the upper fixed plate 21 is formed in a substantially disc shape (that is, the outer peripheral annular ring of the upper fixed plate 21). And the inflow pipe 35 ′ is extended to the lower side of the upper fixed plate 21 in the main body tank 10, without the fan-shaped opening between the radial connection portions 21 c between the portion 21 a and the inner peripheral annular portion 21 b). The refrigerant is spouted along the inner peripheral surface of the body 11.

  The inflow pipe 35 'of the present embodiment is bent in a plane perpendicular to the straight pipe portion 35A which is fixed by hanging on the lid 12 (the inflow port 15 of the lid 12 or the like by the brazing etc. and suspended), and is bent in a plane orthogonal to the straight pipe portion 35A. And an arc-shaped injection pipe portion 35B. The tip of the tip injection port 35c of the arc-shaped injection pipe portion 35B has an acute angle.

  The upper fixed plate 21 is formed between the inner pipe 31 and the outer pipe 32 in the outflow pipe 30 by passing the arc-shaped injection pipe portion 35B and passing the gas phase refrigerant through the space above the upper fixed plate 21. A long hole 21 h of a circular arc shape in a plan view is formed to guide it to a space (gas phase refrigerant lower feed passage).

  The refrigerant in a gas-liquid mixed state spouted from (the tip end injection port 35c of) the arc-shaped injection pipe portion 35B of the inflow pipe 35 'becomes a swirling flow along the inner peripheral surface of the body 11 of the main tank 10 The refrigerant is separated into the phase refrigerant and the gas phase refrigerant, and the liquid phase refrigerant (containing oil) flows down along the inner peripheral surface of the main body tank 10 and is led to the lower space of the main body tank 10 Hole 21 h → space above the upper fixed plate 21 → space formed between the inner pipe 31 and the outer pipe 32 in the outflow pipe 30 (gas phase refrigerant lower flow path) → inner pipe 31 (and integral therewith It is sucked and circulated to the suction side of the compressor through the inner space of the outlet pipe 36).

  Also in the accumulator 2 having such a configuration, in addition to the effects substantially similar to those of the first embodiment can be obtained, the number of parts is reduced more than that of the first embodiment, so parts cost and assembly cost are further reduced. it can.

Third Embodiment
3 (A) and 3 (B) show a third embodiment of the accumulator according to the present invention, FIG. 3 (A) is a longitudinal sectional view, and FIG. 3 (B) is a B-B arrow in FIG. 3 (A). FIG. Also in the accumulator 3 of the third embodiment, the parts corresponding to the respective parts of the accumulator 1 of the first embodiment are given the same or related reference numerals (such as' with a letter), and the redundant description is omitted. Explain the points with emphasis.

  In the accumulator 3 of the present embodiment, the lower end portion (lower thin small diameter portion 32b) of the outer pipe 32 is narrowed in a funnel shape by drawing, and an oil return hole 45 'is provided at the center thereof. A strainer 40 'covering the oil return hole 45' is provided on the lower fixing plate 22 'instead of the bottom of the outer pipe 32.

  In detail, the lower fixing plate 22 'has an inner circumferential annular portion 22b' having a short cylindrical portion and a wide ridged portion, and the outer circumferential portion of the wide ridged portion of the inner circumferential annular portion 22b ' Portion 22m) (in the illustrated example, four portions extended between the radial connection portions 22c) are folded back to hold down the strainer 40 'by sandwiching the bowl-shaped portion 40a' of the hemispherical strainer 40 '. It fixes to side fixed plate 22 '.

  Also in the accumulator 3 having such a configuration, in addition to the effects substantially similar to those of the first embodiment being obtained, the processing cost and the like of the outer tube 32 can be reduced.

Fourth Embodiment
4 (A) and 4 (B) show a fourth embodiment of the accumulator according to the present invention, FIG. 4 (A) is a longitudinal sectional view, and FIG. 4 (B) is an arrow B-B in FIG. 4 (A). FIG. Also in the accumulator 4 of the fourth embodiment, the parts corresponding to the respective parts of the accumulator 3 of the third embodiment are given the same or related reference numerals (such as with '), and the redundant description is omitted. Explain the points with emphasis.

  Similarly to the accumulator 3 of the third embodiment, the accumulator 4 of the present embodiment is also provided with a strainer 40 ′ ′ on the lower fixed plate 22 ′, but in the present embodiment, the ridged portion of the strainer 40 ′ ′ At the same time as turning back 40a ′ ′, the turning portion is sandwiched from the bottom with washer 47 against inner circumferential annular portion 22b ′ of lower fixed plate 22 ′, and spot welding from inner side of washer 47 to inner circumferential annular portion 22b ′ Bonding (welding part K). The washer 47 may be omitted, and the folded portion of the strainer 40 '' may be directly joined to the inner annular portion 22b '.

  Also in the accumulator 4 having such a configuration, in addition to the effects substantially similar to those of the third embodiment can be obtained, the processing and assembly costs etc. can be suppressed lower than that of the third embodiment.

Fifth Embodiment
5 (A) and 5 (B) show a fifth embodiment of the accumulator according to the present invention, FIG. 5 (A) is a longitudinal sectional view, and FIG. 5 (B) is a B-B arrow in FIG. 5 (A). FIG. Also in the accumulator 5 of the fifth embodiment, the parts corresponding to the respective parts of the accumulator 4 of the fourth embodiment are given the same or related reference numerals (such as with '), and the redundant explanation is omitted. Explain the points with emphasis.

  Similarly to the accumulators 3 and 4 of the third and fourth embodiments, the accumulator 5 of the present embodiment is also provided with a strainer 42 on the lower fixed plate 22 ′, but in the present embodiment, the lower fixed plate 22 is also provided. A strainer 42 made of a metal circular plate-like mesh filter is provided to cover the fan-shaped openings formed between the radial connection portions 22c of the '. The outer peripheral portion 42 a of the strainer 42 is crimped and held between the outer peripheral annular portion 22 a of the lower fixed plate 22 ′ and the lower end surface of the body 11 which is vertically inverted with respect to that of the fourth embodiment. The circumferential portion 42b is spot-welded from the washer 44 side in a state of being sandwiched between the inner circumferential annular portion 22b 'of the lower fixed plate 22' and the washer 44 engaged with the step portion 32d of the inner pipe 32. It is joined to inner circle part 22b 'of fixed plate 22' (welding part K).

  It is a matter of course that substantially the same function and effect as those of the third and fourth embodiments can be obtained also in the accumulator 5 having such a configuration.

  The materials and the like of the inner pipe 31 and the outer pipe 32 constituting the outflow pipe 30 are not limited to those of the above embodiment, and can be arbitrarily selected from aluminum, SUS, copper and the like. Further, the materials of the inner pipe 31 and the outer pipe 32 do not need to be different from each other as in the above embodiment, and the same material may be used, or they may be manufactured as an integral body by extrusion molding or the like. (For example, the inner pipe 31, the outer pipe 32, and the plate-like rib 31d shown in FIG. 6 may be integrated), and they may be separately manufactured and then integrated.

1 Accumulator (first embodiment)
2 Accumulator (2nd embodiment)
3 Accumulator (3rd embodiment)
4 Accumulator (4th embodiment)
5 Accumulator (5th embodiment)
DESCRIPTION OF SYMBOLS 10 Body tank 11 body 12 lid 13 bottom body 15 inlet 16 outlet 18 gas-liquid separator 21 upper fixed plate 22 lower fixed plate 22 m caulking part 30 outflow pipe 31 inner pipe 32 outer pipe 35 inflow pipe 36 outlet pipe 40 Strainer 42 Strainer 45 Oil return hole J Weld or braze K weld

Claims (11)

What is claimed is: 1. An accumulator comprising: a main tank; and an outlet pipe having a double pipe structure comprising an inner pipe and an outer pipe disposed on the outer periphery of the inner pipe,
The main body tank has a cylindrical iron body, an iron lid and a bottom body are fixed to both ends in the longitudinal direction of the body, and the lid is provided with an inlet and an outlet.
The accumulator is characterized in that the inner pipe is suspended from the outlet, and the outer pipe is supported and fixed to the main tank in a state where one end thereof is positioned lower than a top surface of the lid by a predetermined distance. .   The accumulator according to claim 1, wherein the inner pipe is integrated with an outlet pipe extended from the outlet to the outside of the lid.   The gas-liquid separator according to claim 1 or 2, wherein a bowl-like or inverted thin bowl-like gas-liquid separator having a diameter smaller than the inner diameter of the main body tank is disposed below the top surface of the lid. accumulator.   The accumulator according to claim 3, wherein the gas-liquid separator covers an opening on one end side formed by the inner pipe and one end of the outer pipe.   5. The oil return hole is provided at the bottom of the outer pipe, and a strainer having a metal mesh filter is provided to cover the oil return hole, according to any one of claims 1 to 4. Accumulator described in Section.   The accumulator according to claim 5, wherein a lower end of the strainer is in contact with or pressed against the bottom body.   The accumulator according to claim 5 or 6, wherein the strainer is provided in the outer pipe.   The outer tube is an outer circumferential annular portion sandwiched between the body and the lid or the bottom, an inner circumferential annular portion externally fitted to the outer tube, and the outer circumferential annular portion and the inner circumferential annular portion The accumulator according to any one of claims 5 to 7, wherein the accumulator is supported by a fixed plate having a plurality of radial connection parts connecting the two.   A thin-walled small-diameter portion is formed so that a step portion is generated in the outer pipe, and the inner circumferential annular portion of the fixed plate is externally fitted to the thin-walled small diameter portion, and the step portion is engaged with the inner circumferential annular portion The accumulator according to claim 8, characterized in that:   The accumulator according to claim 8 or 9, wherein the strainer is provided on the fixed plate.   An inflow pipe for performing gas-liquid separation by sticking a refrigerant along the inner peripheral surface of the main tank to generate a swirling flow is fixed to the inflow port of the lid. The accumulator according to any one of Items 1 to 10.

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