JP3870744B2 - accumulator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a desiccant fixing structure that adsorbs moisture in a refrigerant in an accumulator that separates gas and liquid of the refrigerant, accumulates the liquid refrigerant, and leads the gas refrigerant to a compressor suction side in a refrigeration cycle.
[0002]
[Prior art]
Conventionally, DENSO Public Technical Bulletin No. 130-006 (issued on January 15, 2000) has an oil return hole in the vicinity of the bottom of the U-shaped refrigerant outlet pipe in this type of accumulator. A filter for removing foreign matter in the liquid refrigerant sucked into the hole is disposed at the bottom of the U-shaped refrigerant outlet pipe, and further, between the bottom of the U-shaped refrigerant outlet pipe and the bottom surface in the accumulator, The structure which arrange | positions the desiccant which adsorb | sucks the water | moisture content in is described.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, since the desiccant is only disposed between the bottom of the U-shaped refrigerant outlet pipe and the bottom of the accumulator, the desiccant becomes unstable and is caused by vehicle vibration or the like. Easy to move desiccant. As a result, the refrigerant liquid surface in the accumulator is bubbled by the movement of the desiccant, and the gas-liquid separation function of the refrigerant is impaired.
[0004]
Therefore, it is conceivable that the distance between the bottom of the U-shaped refrigerant outlet pipe and the tank bottom in the accumulator is reduced, and the desiccant is strongly sandwiched between the refrigerant outlet pipe bottom and the tank bottom in the accumulator. If it does in this way, a strong pressing force will act also on a filter, a filter will be crushed, and the malfunction that a filter function is impaired will arise.
[0005]
An object of this invention is to enable it to fix a desiccant easily and reliably in an accumulator in view of the said point.
[0006]
Another object of the present invention is to achieve both fixing of the desiccant in the accumulator and prevention of breakage of the filter.
[0007]
Another object of the present invention is to provide a desiccant fixing structure that facilitates ensuring the return of oil to the compressor in the accumulator.
[0008]
[Means for Solving the Problems]
The present invention has been made to achieve the above object. In the invention described in claim 1, the gas refrigerant is disposed on the suction side of the compressor (1) of the refrigeration cycle, and the liquid refrigerant is separated. A tank main body (50) to be stored, a refrigerant inflow portion (51) for allowing refrigerant from the evaporator (4) outlet of the refrigeration cycle to flow into the tank main body (50), and a tank main body (50). A U-shaped refrigerant outlet pipe (52), a gas refrigerant suction part (52b) provided at an upper part of the refrigerant outlet pipe (52) and sucking the gas refrigerant in the upper part of the tank body (50), and a refrigerant outlet An oil return hole (55) provided near the bottom (52c) of the pipe (52) for sucking liquid refrigerant and lubricating oil in the lower part of the tank body (50), and adsorbs moisture in the tank body (50) A desiccant (57)
A desiccant (57) is attached in an inverted U shape from the top to at least a portion of the bottom (52c) of the refrigerant outlet pipe (52) excluding the periphery of the oil return hole (55), and the desiccant (57) is attached to the string-like member (57). 58), and is fastened and fixed to the bottom (52c) of the refrigerant outlet pipe (52).
[0009]
Thus, the desiccant (57) can be securely fastened and fixed to the bottom (52c) of the refrigerant outlet pipe (52) by the string-like member (58), so that the desiccant (57) is moved by the vibration of the vehicle or the like. The refrigerant liquid level in the tank body (50) is not bubbled.
[0010]
In addition, since the desiccant (57) is mounted in an inverted U shape from the top on at least the portion around the oil return hole (55) in the bottom (52c) of the refrigerant outlet pipe (52), the tank main body (50) The lower liquid refrigerant and oil can be smoothly sucked from the oil return hole (55) without being obstructed by the desiccant (57). Moreover, since the desiccant (57) is attached to the bottom (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is immersed in the liquid refrigerant in the lower part of the tank body (50). be able to. As a result, even if the oil is captured by the desiccant (57), the captured oil can be returned to the compressor (1) through the surrounding liquid refrigerant again.
[0011]
Therefore, oil does not remain trapped in the desiccant (57), the oil return to the compressor (1) can be maintained well, and the durability of the compressor (1) can be improved.
[0012]
Further, since the desiccant (57) is arranged in an inverted U shape, moisture is absorbed by the inverted U shape even if the desiccant (57) is located at a low position near the bottom of the tank body (50). The necessary amount of adsorbent can be secured.
[0013]
The invention according to claim 2 is provided with a filter (56) which is arranged so as to overlap with the oil return hole (55) and which removes foreign matter sucked into the oil return hole (55).
When the desiccant (57) is mounted in an inverted U shape, the opposite U-shaped ends (57b, 57c) of the desiccant (57) are on the radially outer side of the refrigerant outlet pipe (52) than the filter (56). It is characterized by being located in
[0014]
Thus, when the desiccant (57) is fastened and fixed to the bottom (52c) of the refrigerant outlet pipe (52) by the string-like member (58), the string-like member (58) directly contacts the surface of the filter (56). Most things disappear. Therefore, the tightening force of the string-like member (58) does not directly act on the surface of the filter (56), and the filter 56 can be prevented from being crushed and damaged by the tightening force of the string-like member 58. Can be guaranteed reliably.
[0015]
According to a third aspect of the present invention, in the first aspect, the bottom (52c) of the refrigerant outlet pipe (52) is fitted and held so as to overlap with the oil return hole (55), and the oil return hole (55). Provided with a ring-shaped filter (56) for removing inhaled foreign matter,
The length (L1) of the inner surface of the inverted U-shaped desiccant (57) is longer than the circumferential length (L2) of the outer peripheral surface of the filter (56).
[0016]
Accordingly, the opposite U-shaped end portions (57b, 57c) of the desiccant (57) are located on the radially outer side of the refrigerant outlet pipe (52) with respect to the filter (56). 56 filter functions can be reliably guaranteed.
[0017]
As in a fourth aspect of the present invention, in any one of the first to third aspects, the string member (58) is separated from the desiccant (57), and the separate string member (58). May be wound around the entire outer surface of the inverted U-shaped outer surface of the desiccant (57).
[0018]
As in the invention described in claim 5, in any one of claims 1 to 3, the string-like member (58) may be integrally formed with the desiccant (57).
[0024]
  Claim6In the invention described in the above, the tank main body (50) that is disposed on the suction side of the compressor (1) of the refrigeration cycle to separate the gas-liquid refrigerant and stores the liquid refrigerant, and the evaporator (4) outlet of the refrigeration cycle A refrigerant inflow part (51) for allowing refrigerant from the tank main body part (50) to flow, a U-shaped refrigerant outlet pipe (52) disposed in the tank main body part (50), and a refrigerant outlet pipe (52 ) And is provided in the vicinity of the bottom (52c) of the refrigerant outlet pipe (52) and the gas refrigerant suction part (52b) for sucking the gas refrigerant in the upper part of the tank main body (50). 50) An oil return hole (55) for sucking liquid refrigerant and lubricating oil in the lower part of the inner part, and a desiccant (57) for adsorbing moisture in the tank body (50),
  The desiccant (57) has a bag-like member (57a) for containing a moisture adsorbent, and the bag-like member (57a) is provided with two through holes (57b), and the two through holes (57b) are U-shaped. By inserting the letter-shaped refrigerant outlet pipe (52), the desiccant (57) is mounted so as to cover the upper surface of the bottom (52c) of the refrigerant outlet pipe (52).
[0025]
As a result, the holding means can be used only by inserting the U-shaped refrigerant outlet pipe (52) into the two through holes (57b) provided in the bag-like member (57a) of the desiccant (57). In addition, the desiccant (57) can be mounted and held on the bottom (52c) of the refrigerant outlet pipe (52) very simply.
[0026]
  Moreover, the desiccant (57) is attached to the bottom (52c) of the U-shaped refrigerant outlet pipe (52).1Similarly, the oil return to the compressor (1) can be maintained satisfactorily, and the lubricity of the compressor (1) can be ensured satisfactorily.
[0027]
  Claim7In the invention described in claim6And a filter (56) for removing foreign matter sucked into the oil return hole (55) at least at the bottom (52c) of the refrigerant outlet pipe (52). A desiccant (57) is attached in an inverted U shape from the upper part of the filter (56) to a portion excluding the periphery of the oil return hole (55).
  According to this, since the desiccant (57) is mounted in an inverted U shape from the top on at least the portion around the oil return hole (55) in the bottom (52c) of the refrigerant outlet pipe (52), the tank body (50 ) The liquid refrigerant and oil in the lower part can be smoothly sucked into the oil return hole (55) without being obstructed by the desiccant (57).
  Moreover, since the desiccant (57) is attached to the bottom (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is immersed in the liquid refrigerant in the lower part of the tank body (50). be able to. As a result, even when the oil is temporarily captured by the desiccant (57), the captured oil can be recirculated to the compressor (1) through the surrounding liquid refrigerant. Therefore, the oil return to the compressor (1) can be maintained satisfactorily.
[0028]
  Further, since the desiccant (57) is arranged in an inverted U shape, moisture is absorbed by the inverted U shape even if the desiccant (57) is located at a low position near the bottom of the tank body (50). The necessary amount of adsorbent can be secured.
  In the invention according to claim 8, a tank main body (50) that is disposed on the suction side of the compressor (1) of the refrigeration cycle to separate the gas-liquid refrigerant and stores the liquid refrigerant, and an evaporator ( 4) A refrigerant inflow portion (51) for allowing refrigerant from the outlet to flow into the tank main body (50), a U-shaped refrigerant outlet pipe (52) disposed in the tank main body (50), and a refrigerant outlet Provided in the upper part of the pipe (52), provided near the bottom part (52c) of the gas refrigerant suction part (52b) for sucking the gas refrigerant in the upper part of the tank body part (50) and the refrigerant outlet pipe (52), An oil return hole (55) for sucking liquid refrigerant and lubricating oil in the lower part of the main body (50), and a desiccant (57) for adsorbing moisture in the tank main body (50),
  A desiccant (57) is arranged on the upper surface of the bottom of the refrigerant outlet pipe (52), and pressing means (58, 59) for pressing the desiccant (57) toward the upper surface of the bottom of the refrigerant outlet pipe (52) are further provided in the refrigerant outlet. Prepare for the tube (52)
  A filter (56) for removing foreign matter sucked into the oil return hole (55) is arranged so as to overlap with the oil return hole (55),
  The desiccant (57) is mounted in an inverted U shape from the top of the filter (56) at least on the bottom (52c) of the refrigerant outlet pipe (52) except for the periphery of the oil return hole (55). To do.
  Thus, the desiccant (57) disposed on the upper surface of the bottom of the refrigerant outlet pipe (52) is pressed by the pressing means (58, 59) toward the upper surface of the bottom of the refrigerant outlet pipe (52). The desiccant (57) can be reliably fixed to the bottom upper surface of the refrigerant outlet pipe (52).
  Moreover, since the desiccant (57) is attached to the bottom (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is immersed in the liquid refrigerant in the lower part of the tank body (50). As a result, the oil return to the compressor (1) can be maintained satisfactorily, and the lubricity of the compressor (1) can be ensured satisfactorily.
  Furthermore, in the invention described in claim 8, as in the case of claim 7, the desiccant (57) is provided from the top to the portion of the bottom (52c) of the refrigerant outlet pipe (52) excluding at least the periphery of the oil return hole (55). Since it is mounted in an inverted U shape, the same effect as that of the seventh aspect can be exhibited.
  As in the invention described in claim 9, in claim 8, the pressing means is a string-like member (58) that is tightened between the two pipe portions (52d, 52e) of the U-shaped refrigerant outlet pipe (52). Can be configured.
  Further, as in the invention described in claim 10, in claim 8, the pressing means may be constituted by a plate-like member (59) fixed to the refrigerant outlet pipe (52).
[0029]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 shows a refrigeration cycle of a vehicle air conditioner according to the first embodiment. The compressor 1 is driven by a vehicle engine (not shown) via a belt, a pulley, and the like. The high-pressure gas refrigerant discharged from the compressor 1 flows into the condenser 2, where it is cooled by heat exchange with the outside air and condensed.
[0031]
The liquid refrigerant condensed in the condenser 2 is then decompressed to a low pressure by the decompression device 3 to be in a mist-like gas-liquid two-phase state. The decompression device 3 is composed of a fixed throttle such as a capillary tube, an orifice, or a nozzle, an appropriate variable throttle that responds to the state (pressure, temperature) of the cycle high-pressure refrigerant, or a combination of a fixed throttle and a variable throttle. The decompressed low-pressure refrigerant absorbs heat from the air blown from an air-conditioning blower (not shown) in the evaporator 4 and evaporates.
[0032]
The evaporator 4 is arranged in an air conditioning case (not shown) of the indoor unit of the vehicle air conditioner. As is well known, the temperature of the cool air cooled by the evaporator 4 is adjusted by a heater core not shown in the vehicle interior. Blow out. The refrigerant that has passed through the evaporator 4 is gas-liquid separated by an accumulator 5 and then sucked into the compressor 1.
[0033]
The accumulator 5 separates the gas-liquid refrigerant from the outlet of the evaporator 4, stores the liquid refrigerant, sucks the gas refrigerant into the compressor 1, and also removes the oil dissolved in the liquid refrigerant collected on the tank bottom side. Inhaled.
[0034]
2 and 3 illustrate a specific structure of the accumulator 5 according to the first embodiment, and the accumulator 5 has a tank body 50 formed in a vertically long cylindrical shape extending in the vertical direction. In this example, the tank body 50 is formed by integrally joining an upper tank 50a and a lower tank 50b formed of a metal such as aluminum by joining means such as welding.
[0035]
A refrigerant inlet pipe 51 is disposed so as to penetrate the upper surface portion of the tank main body 50. The refrigerant inlet pipe 51 constitutes a refrigerant inflow portion for allowing the refrigerant from the outlet of the evaporator 4 to flow into the tank main body portion 50. In addition, a refrigerant outlet pipe 52 bent in a U shape is disposed inside the tank main body 50, and one end portion 52a of the refrigerant outlet pipe 52 passes through the upper surface of the tank main body 50 to the outside of the tank. It arranges so that it may take out. This one end 52 a is connected to the suction side of the compressor 1.
[0036]
Further, the U-shaped other end (upper end) 52b of the refrigerant outlet pipe 52 opens directly into the lower space of the gas-liquid separation plate 53 in the upper part in the tank main body 50, and this upper end. The opening constitutes a gas refrigerant suction part that sucks the gas refrigerant in the upper part of the tank main body 50.
[0037]
The gas-liquid separation plate 53 is disposed in the upper part of the tank main body 50 with a predetermined interval from the lower end opening of the refrigerant inlet pipe 51. The gas-liquid separation plate 53 is formed in a bowl-like shape having a high central portion and an outer peripheral edge hanging down. The gas-liquid separation plate 53 is formed of metal or resin, and has a through-hole through which one end portion 52a of the refrigerant outlet pipe 52 passes. The gas-liquid separation plate 53 is fixed to the refrigerant outlet pipe 52 at this through-hole portion. ing. Further, a gap 54 through which the refrigerant passes is formed between the outer peripheral edge of the gas-liquid separation plate 53 and the inner wall surface of the tank main body 50.
[0038]
Both the refrigerant inlet pipe 51 and the refrigerant outlet pipe 52 are formed of a metal such as aluminum. The refrigerant inlet pipe 51 is inserted into a through hole in the upper surface of the tank main body 50, and is fixed to the through hole by a joining means such as welding. Further, one end (upper end) 52a of the refrigerant outlet pipe 52 is inserted into a through hole in the upper surface of the tank main body 50, and is fixed to the through hole by a joining means such as welding.
[0039]
An oil return hole 55 made of a minute circular hole having a diameter of about 1 mm is formed in the lower surface of the bottom 52c of the U-shaped refrigerant outlet pipe 52. Further, a filter 56 is attached to the bottom portion 52 c of the U-shaped refrigerant outlet pipe 52 so as to be superposed on the opening position of the oil return hole 55.
[0040]
Accordingly, the lubricating oil accumulated in the lower part of the tank main body 50 can be sucked into the refrigerant outlet pipe 52 from the oil return hole 55 through the filter 56. Since the lubricating oil is actually dissolved in the liquid refrigerant, the liquid refrigerant is sucked into the refrigerant outlet pipe 52 from the oil return hole 55 together with the lubricating oil. And since the foreign material in a refrigerant | coolant can be removed with the filter 56, it can prevent that the oil return hole 55 which consists of a micro hole is obstruct | occluded with the foreign material in a refrigerant | coolant.
[0041]
4 and 5, the filter 56 is formed in a ring shape in this example, and is fitted and held in the refrigerant outlet pipe 52. Specifically, the filter 56 is made of a fine mesh-like member (mesh member) made of resin, and the ring shape of the mesh-like member is reinforced by reinforcing pieces 56a arranged at equal intervals of 120 °.
[0042]
Further, a desiccant 57 is disposed near the bottom 52c of the U-shaped refrigerant outlet pipe 52. The desiccant 57 is obtained by storing a granular moisture adsorbent such as zeolite in a bag-like member 57a. The bag-like member 57a is formed of a breathable and flexible cloth-like material such as felt.
[0043]
As shown in FIGS. 4 and 5, the desiccant 57 is attached in an inverted U shape so as to cover the bottom 52 c of the U-shaped refrigerant outlet pipe 52 from the top of the filter 56. Here, the length L1 of the inner side surface of the inverted U-shape of the desiccant 57 is longer than the circumferential length L2 of the outer peripheral surface of the filter 56. Therefore, in a state immediately after the desiccant 57 is put on the bottom 52c of the U-shaped refrigerant outlet pipe 52 from the top of the filter 56 in an inverted U shape, both ends 57b of the inverted U shape of the desiccant 57 as shown in FIG. 57c protrudes from the filter 56 by a predetermined amount α toward the radially outer side of the refrigerant outlet pipe 52.
[0044]
Since the desiccant 57 is mounted on the bottom 52c of the refrigerant outlet pipe 52 in an inverted U shape from top to bottom, the desiccant 57 is disposed around the oil return hole 55 opened on the lower surface of the bottom 52c of the refrigerant outlet pipe 52. Will not cover. Therefore, the desiccant 57 does not hinder the intake of the lubricating oil into the oil return hole 55.
[0045]
In FIG. 4, a string-like member 58 is a fastening (band) member that fastens the desiccant 57 and fixes the desiccant 57 to the bottom 52 c of the refrigerant outlet pipe 52. The string-like member 58 is formed of resin or the like, and has a pipe-like locking portion 58a at one end thereof. Locking claws are formed on the inner surface of the pipe-shaped locking portion 58a. The string-like member 58 is wound so as to cover the entire outer surface of the reverse U-shaped outer surface of the desiccant 57, and then the other end of the string-like member 58 is inserted into the pipe-like engaging portion 58a at one end thereof. By pulling the other end of the string-like member 58, the tightening force of the string-like member 58 is applied to the desiccant 57, and the desiccant 57 can be fastened and fixed to the bottom 52c of the refrigerant outlet pipe 52.
[0046]
Even when the tightening force of the other end of the string-like member 58 is released, the fastening state of the desiccant 57 is caused by the engagement claws on the inner surface of the pipe-like engaging part 58a biting into the other end of the string-like member 58. Can be maintained. FIG. 4 shows a state after the other end portion (unnecessary portion) of the string-like member 58 protruding from the pipe-like locking portion 58a is cut.
[0047]
Next, the function and effect of the first embodiment will be described. (1) The desiccant 57 is mounted in an inverted U shape so as to cover the bottom 52c of the U-shaped refrigerant outlet pipe 52 from the upper part of the filter 56, and the desiccant 57 is attached to the U-shaped refrigerant outlet pipe by the string member 58. The desiccant 57 can be reliably fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 because it is fastened and fixed to the bottom portion 52c of the 52. Therefore, the desiccant 57 does not move due to vehicle vibration or the like, and the refrigerant liquid level in the tank body 50 is not bubbled.
[0048]
(2) When the desiccant 57 is mounted on the bottom 52c of the U-shaped refrigerant outlet pipe 52 in a reverse U shape, the length L1 of the inner surface of the reverse U shape of the desiccant 57 is set to the circle on the outer peripheral surface of the filter 56. The opposite U-shaped ends 57b and 57c of the desiccant 57 are longer than the circumferential length L2 by a predetermined amount α toward the radially outer side (lower side) of the refrigerant outlet pipe 52 than the filter 56 as shown in FIG. Therefore, when the desiccant 57 is fastened and fixed to the bottom 52c of the U-shaped refrigerant outlet pipe 52 by the string-like member 58, the fastening force of the string-like member 58 is almost directly applied to the filter 56. Absent. Therefore, even if the desiccant 57 is placed over the filter 56 and tightened and fixed, the filter 56 can be prevented from being crushed and damaged by the tightening force of the string-like member 58, and the filter function of the filter 56 can be ensured. Can be guaranteed.
[0049]
(3) Since the desiccant 57 is mounted in a reverse U shape from the top of the filter 56 to the bottom 52c of the U-shaped refrigerant outlet pipe 52, the desiccant 57 is placed around the lower surface of the filter 56 and the oil return hole 55. Do not cover. Accordingly, the liquid refrigerant and lubricating oil in the lower part of the tank body 50 can be smoothly sucked into the refrigerant outlet pipe 52 through the lower surface of the filter 56 and the oil return hole 55.
[0050]
(4) Since the desiccant 57 is attached to the bottom 52c of the U-shaped refrigerant outlet pipe 52 in an inverted U shape, the entire desiccant 57 can be immersed in the liquid refrigerant in the lower part of the tank body 50.
[0051]
Here, if the desiccant 57 is exposed to the gas refrigerant region in the upper part of the tank main body 50, the oil remains captured by the desiccant 57 at the exposed portion of the gas refrigerant region, and the inside of the tank main body 50. Since the oil does not migrate into the lower liquid refrigerant, the oil captured by the desiccant 57 cannot be returned to the compressor 1, which causes insufficient lubrication of the compressor 1.
[0052]
On the other hand, according to the present embodiment, since the entire desiccant 57 can be immersed in the liquid refrigerant, even if the oil is temporarily captured by the desiccant 57, the captured oil is again passed through the surrounding liquid refrigerant to the compressor. Reflux to 1 side.
[0053]
In addition, since the desiccant 57 is arranged in an inverted U shape, even if the desiccant 57 is located at a low position near the bottom of the tank body 50, the required amount of moisture adsorbent can be reduced by the inverted U shape. Easy to secure.
[0054]
(Second Embodiment)
In the first embodiment, the stringer member 58 separate from the desiccant 57 is used to fasten and fix the desiccant 57 to the bottom 52c of the U-shaped refrigerant outlet pipe 52. In the second embodiment, As shown in FIG. 6, a string-like member 58 is integrally attached to both ends of the bag-like member 57a of the desiccant 57 in the longitudinal direction in advance. And after attaching desiccant 57 to the bottom part 52c of the U-shaped refrigerant | coolant exit pipe | tube 52 similarly to 1st Embodiment, the string-like member 58 of both ends is fastened and desiccant 57 is made into U shape. It is fastened and fixed to the bottom 52c of the refrigerant outlet pipe 52.
[0055]
(Third embodiment)
In the third embodiment, as shown in FIG. 7, a string-like member 58 is integrally attached to one end of the bag-like member 57 a of the desiccant 57 in the longitudinal direction in advance, and the tip of the string-like member 58 is finely attached. A tape-shaped locking member 58b having a number of hook-shaped locking portions is provided. The tape-like locking member 58b is generally called a magic tape.
[0056]
After the desiccant 57 is attached to the bottom 52c of the U-shaped refrigerant outlet pipe 52 in an inverted U shape, the bag-like member 57a of the desiccant 57 is tightened while tightening the tape-like locking member 58b at the tip of the string-like member 58. The desiccant 57 is fastened to the bottom 52c of the U-shaped refrigerant outlet pipe 52 by being locked to the surface.
[0057]
(Fourth embodiment)
In the first to third embodiments, after attaching the desiccant 57 to the bottom 52c of the U-shaped refrigerant outlet pipe 52 in an inverted U shape, the tightening force of the string-like member 58 is directly applied to the desiccant 57 to dry it. The agent 57 is fastened and fixed to the bottom 52c of the U-shaped refrigerant outlet pipe 52. In the fourth embodiment, the desiccant 57 is not applied directly to the desiccant 57 in the form in which the fastening force of the string-like member 58 is applied. It is held on the bottom 52c of the U-shaped refrigerant outlet pipe 52.
[0058]
FIG. 8 shows a fourth embodiment. A ring-shaped filter 56 is fitted and held on the bottom 52 c of the U-shaped refrigerant outlet pipe 52, and on the upper surface side of the bottom 52 c of the U-shaped refrigerant outlet pipe 52. A desiccant 57 is mounted in an inverted U shape through the filter 56.
[0059]
Then, the same string-like member 58 as that in the first embodiment is crossed between the two pipe portions 52 d and 52 e of the U-shaped refrigerant outlet pipe 52 at the upper part of the desiccant 57 and tightened. By means of the crossing portion of the string-like member 58, the desiccant 57 is pressed toward the upper surface of the bottom 52c of the U-shaped refrigerant outlet pipe 52, and the desiccant 57 is placed on the bottom 52c of the U-shaped refrigerant outlet pipe 52. Hold. That is, in 4th Embodiment, the pressing means of the desiccant 57 is comprised by the string-like member 58 which has a cross-shaped extending part.
[0060]
In the fourth embodiment, if the surface of the tube portions 52d and 52e is formed with an uneven surface and the string member 58 is locked to the uneven surface, the tube portions 52d and 52e of the string member 58 are used. It is possible to easily prevent fluctuations in the tightening position with respect to, which is a more preferable configuration.
[0061]
(Fifth embodiment)
The fifth embodiment is based on the same idea as the fourth embodiment, and a plate-like pressing member 59 is used instead of the string-like member 58 as shown in FIG. The agent 57 is pressed toward the upper surface of the bottom 52c of the U-shaped refrigerant outlet pipe 52, and the desiccant 57 is held on the bottom 52c of the U-shaped refrigerant outlet pipe 52.
[0062]
The plate-like pressing member 59 may be made of either metal or resin. In the case of metal, one end of the plate-like pressing member 59 is connected to the U-shaped refrigerant outlet pipe by means such as welding, brazing, or caulking. It fixes to 52 pipe parts 52d (or pipe part 52e). When the plate-like pressing member 59 is made of resin, one end of the plate-like pressing member 59 is connected to the pipe portion of the U-shaped refrigerant outlet pipe 52 by a press-fit locking structure using elastic deformation of the resin. You may make it fix to 52d (or pipe part 52e).
[0063]
(Sixth embodiment)
In the sixth embodiment, the desiccant 57 is held on the bottom 52c of the U-shaped refrigerant outlet pipe 52 by means different from the first to fifth embodiments.
[0064]
FIG. 10A shows the desiccant 57 according to the sixth embodiment, and two through holes 57b are provided in the center of the bag-like member 57a of the desiccant 57 in the longitudinal direction. In the sixth embodiment, after the ring-shaped filter 56 is fitted and held on the bottom 52c of the U-shaped refrigerant outlet pipe 52, the two pipes of the U-shaped refrigerant outlet pipe 52 are inserted into the two through holes 57b of the desiccant 57. By inserting the portions 52d and 52e, the desiccant 57 is mounted in an inverted U shape so as to cover the top surface of the bottom portion 52c of the refrigerant outlet pipe 52 from the top of the filter 56. FIG. 10B shows a state where the desiccant 57 is attached to the bottom 52 c of the refrigerant outlet pipe 52.
[0065]
(Other embodiments)
It is needless to say that the accumulator according to the present invention can be applied not only to the vehicle but also to various uses.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a refrigeration cycle to which an accumulator of the present invention is applied.
FIG. 2 is a longitudinal sectional view of the accumulator according to the first embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of the accumulator according to the first embodiment, showing the sectional shape of the refrigerant inlet / outlet pipe.
FIG. 4 is an explanatory view showing a desiccant tightening and fixing structure according to the first embodiment.
FIG. 5 is an explanatory diagram of a desiccant mounting process according to the first embodiment.
FIG. 6 is a front view of a desiccant alone according to a second embodiment.
FIG. 7 is a front view of a desiccant alone according to a third embodiment.
8A is an explanatory view of a desiccant holding structure according to a fourth embodiment, and FIG. 8B is a top view of FIG. 8A and shows a refrigerant outlet pipe in a cross-sectional view.
FIG. 9 is an explanatory diagram of a desiccant holding structure according to a fifth embodiment.
10A is a front view of a desiccant alone according to the sixth embodiment, and FIG. 10B is an explanatory view showing a state where the desiccant according to the sixth embodiment is attached to the refrigerant outlet pipe.
[Explanation of symbols]
50 ... Tank body, 52 ... U-shaped refrigerant outlet pipe, 55 ... Oil return hole,
56 ... Filter, 57 ... Desiccant, 58 ... String member.

Claims (10)

A tank body (50) that is disposed on the suction side of the compressor (1) of the refrigeration cycle, separates the gas-liquid refrigerant, and stores the liquid refrigerant;
A refrigerant inflow part (51) for allowing the refrigerant from the outlet of the evaporator (4) of the refrigeration cycle to flow into the tank body part (50);
A U-shaped refrigerant outlet pipe (52) disposed in the tank body (50);
A gas refrigerant suction part (52b) provided at an upper part of the refrigerant outlet pipe (52) and sucking a gas refrigerant in an upper part of the tank main body part (50);
An oil return hole (55) provided near the bottom (52c) of the refrigerant outlet pipe (52) and for sucking liquid refrigerant and lubricating oil in the lower part of the tank body (50);
A desiccant (57) that adsorbs moisture in the tank body (50),
The desiccant (57) is attached in an inverted U shape from the top to at least a portion around the oil return hole (55) in the bottom (52c) of the refrigerant outlet pipe (52),
An accumulator characterized in that the desiccant (57) is fastened and fixed to the bottom (52c) of the refrigerant outlet pipe (52) by a string-like member (58). A filter (56) arranged to overlap with the oil return hole (55) and removing foreign matter sucked into the oil return hole (55);
When the desiccant (57) is mounted in a reverse U shape, both ends (57b, 57c) of the reverse U shape of the desiccant (57) are closer to the refrigerant outlet pipe (52) than the filter (56). 2. The accumulator according to claim 1, wherein the accumulator is located on a radially outward side. A ring-shaped filter that is fitted and held on the bottom (52c) of the refrigerant outlet pipe (52) so as to overlap with the oil return hole (55) and removes foreign matter sucked into the oil return hole (55). (56)
The length (L1) of the inner surface of the inverted U-shape of the desiccant (57) is longer than the circumferential length (L2) of the outer peripheral surface of the filter (56). The accumulator described.   The said string-like member (58) is separate from the said desiccant (57), and is wound around the perimeter of the reverse U-shaped outer surface of the said desiccant (57). The accumulator according to any one of the above.   The accumulator according to any one of claims 1 to 3, wherein the string-like member (58) is integrally formed with the desiccant (57). A tank body (50) that is disposed on the suction side of the compressor (1) of the refrigeration cycle, separates the gas-liquid refrigerant, and stores the liquid refrigerant;
A refrigerant inflow part (51) for allowing the refrigerant from the outlet of the evaporator (4) of the refrigeration cycle to flow into the tank body part (50);
A U-shaped refrigerant outlet pipe (52) disposed in the tank body (50);
A gas refrigerant suction part (52b) provided at an upper part of the refrigerant outlet pipe (52) and sucking a gas refrigerant in an upper part of the tank main body part (50);
An oil return hole (55) provided near the bottom (52c) of the refrigerant outlet pipe (52) and for sucking liquid refrigerant and lubricating oil in the lower part of the tank body (50);
A desiccant (57) that adsorbs moisture in the tank body (50),
The desiccant (57) has a bag-like member (57a) for containing a moisture adsorbent,
The bag-shaped member (57a) is provided with two through holes (57b), and the U-shaped refrigerant outlet pipe (52) is inserted into the two through holes (57b), thereby the desiccant ( 57) is mounted so as to cover the upper surface of the bottom (52c) of the refrigerant outlet pipe (52). A filter (56) arranged to overlap with the oil return hole (55) and removing foreign matter sucked into the oil return hole (55);
The desiccant (57) is mounted in an inverted U shape from the top of the filter (56) at least on the bottom (52c) of the refrigerant outlet pipe (52) except for the periphery of the oil return hole (55). The accumulator according to claim 6 , wherein the accumulator is characterized in that: A tank body (50) that is disposed on the suction side of the compressor (1) of the refrigeration cycle, separates the gas-liquid refrigerant, and stores the liquid refrigerant;
A refrigerant inflow part (51) for allowing the refrigerant from the outlet of the evaporator (4) of the refrigeration cycle to flow into the tank body part (50);
A U-shaped refrigerant outlet pipe (52) disposed in the tank body (50);
A gas refrigerant suction part (52b) provided at an upper part of the refrigerant outlet pipe (52) and sucking a gas refrigerant in an upper part of the tank main body part (50);
An oil return hole (55) provided near the bottom (52c) of the refrigerant outlet pipe (52) and for sucking liquid refrigerant and lubricating oil in the lower part of the tank body (50);
A desiccant (57) that adsorbs moisture in the tank body (50),
Placing the desiccant (57) on the bottom upper surface of the refrigerant outlet pipe (52);
Furthermore, Bei example wherein the desiccant (57) refrigerant outlet pipe presser means for pressing toward the bottom upper surface (52) (58, 59) to said refrigerant outlet pipe (52),
A filter (56) for removing foreign matter sucked into the oil return hole (55) is arranged so as to overlap with the oil return hole (55),
The desiccant (57) is mounted in a reverse U shape from the top of the filter (56) at a portion of the bottom (52c) of the refrigerant outlet pipe (52) excluding at least the periphery of the oil return hole (55). An accumulator characterized by that. The accumulator according to claim 8 , wherein the pressing means is a string-like member (58) mounted between two pipe portions (52d, 52e) of the U-shaped refrigerant outlet pipe (52). . The accumulator according to claim 8 , wherein the pressing means is a plate-like member (59) fixed to the refrigerant outlet pipe (52).

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