JP2003121031A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, surely fix a drying agent to the inside of an accumulator. SOLUTION: Gas and liquid in a coolant are separated, a U-shaped coolant outlet pipe 52 is arranged inside a tank body part 50 storing a liquid coolant, an oil returning hole 55 sucking the liquid coolant in the lower part of a tank body part 50 and lubricating oil is installed in the vicinity of a bottom 52c of the coolant outlet pipe 52, the drying agent 57 for adsorbing moisture inside the tank body part 50 is mounted in a reverse U shape from the upper part of a filter 56 on a portion other than the circumference of at least the oil returning hole 55 in the bottom 52c of the coolant outlet pipe 52, and the drying agent 57 is tightened to the bottom 52c of the coolant outlet pipe 52 with a string-shaped member 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desiccant for adsorbing water in a refrigerant in an accumulator for separating a gas-liquid of a refrigerant, storing a liquid refrigerant, and discharging a gas refrigerant to a compressor suction side in a refrigeration cycle. Regarding the fixed structure of.

[0002]

2. Description of the Related Art Conventionally, Denso Open Technical Report, serial number 13
0-006 (issued on January 15, 2000), in this type of accumulator, an oil return hole is provided near the bottom of the U-shaped refrigerant outlet pipe, and the liquid refrigerant sucked into this oil return hole A filter for removing foreign matter is placed 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,
A configuration in which a desiccant that adsorbs water in the refrigerant is arranged is described.

[0003]

However, in the above-mentioned prior art, since the desiccant is simply arranged between the bottom of the U-shaped refrigerant outlet pipe and the bottom of the accumulator, the desiccant cannot be fixed. It becomes unstable and the desiccant tends to move due to vehicle vibrations and the like. As a result, the liquid level of the refrigerant in the accumulator bubbles due to the movement of the desiccant, and the gas-liquid separation function of the refrigerant is impaired.

Therefore, it is considered that the space between the bottom of the U-shaped refrigerant outlet pipe and the tank bottom of the accumulator is made small so that the desiccant is strongly sandwiched between the refrigerant outlet pipe bottom and the tank bottom of the accumulator. However, in this case, a strong pressing force also acts on the filter, the filter is crushed, and the filter function is impaired.

In view of the above points, an object of the present invention is to make it possible to fix a desiccant in an accumulator easily and surely.

Another object of the present invention is to both fix the desiccant in the accumulator and prevent the filter from being damaged.

It is another object of the present invention to provide a desiccant fixing structure in an accumulator, which makes it easy to ensure oil return to the compressor.

[0008]

The present invention has been made to achieve the above object. According to the invention of claim 1, it is arranged on the suction side of the compressor (1) of the refrigeration cycle and the Tank body (5 for separating gas and liquid and storing liquid refrigerant)
0) and a refrigerant inflow part (5) for allowing the refrigerant from the evaporator (4) outlet of the refrigeration cycle to flow into the tank main body part (50).
1), a U-shaped refrigerant outlet pipe (52) arranged in the tank body (50), and a gas refrigerant provided in an upper portion of the refrigerant outlet pipe (52) and in an upper portion of the tank body (50). And a refrigerant outlet pipe (52) for sucking gas
Is provided near the bottom (52c) of the tank main body (5
0) An oil return hole (55) for sucking the liquid refrigerant and lubricating oil in the lower part of the inside and a desiccant (57) for adsorbing the water in the tank body (50) are provided, and the bottom part of the refrigerant outlet pipe (52). In (52c), at least the oil return hole (5
Apply a desiccant (57) from the top to the reverse U
It is characterized in that the desiccant (57) is fastened and fixed to the bottom portion (52c) of the refrigerant outlet pipe (52) by the string-like member (58).

As a result, the desiccant (57) can be securely tightened and fixed to the bottom portion (52c) of the refrigerant outlet pipe (52) by the string-like member (58), so that the desiccant (57) is prevented from vibration of the vehicle. It does not move and cause the liquid level of the refrigerant in the tank body (50) to bubble.

Further, the bottom portion (52) of the refrigerant outlet pipe (52) is
Since the desiccant (57) is attached in an inverted U shape from the upper part to at least a portion excluding the periphery of the oil return hole (55) in c), the liquid refrigerant and oil in the lower part inside the tank body (50) are desiccated (57). ), It is possible to smoothly inhale through the oil return hole (55). Moreover, since the desiccant (57) is attached to the bottom portion (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is immersed in the liquid refrigerant in the lower portion of the tank body (50). be able to. As a result, even if oil is trapped in the desiccant (57), the trapped oil can flow back to the compressor (1) side through the surrounding liquid refrigerant.

Therefore, the oil is not trapped in the desiccant (57), the oil returning to the compressor (1) is maintained well, and the durability of the compressor (1) can be improved.

Further, since the desiccant (57) is arranged in an inverted U-shape, even if the desiccant (57) is located at a low portion near the bottom of the tank body (50), it has an inverted U-shape. The required amount of the water adsorbent can be secured depending on the form.

According to a second aspect of the invention, there is provided a filter (56) according to the first aspect, which is arranged so as to overlap with the oil return hole (55) and removes foreign matters sucked into the oil return hole (55). When the desiccant (57) is mounted in the inverted U shape, both ends (57) of the desiccant (57) in the inverted U shape are provided.
b, 57c) is connected to the refrigerant outlet pipe (5) rather than the filter (56).
It is characterized in that it is located on the radially outer side of 2).

As a result, when the desiccant (57) is fastened and fixed to the bottom portion (52c) of the refrigerant outlet pipe (52) by the string-like member (58), the string-like member (58) faces the filter (56). Almost never hit directly. Therefore, the tightening force of the string-like member (58) is reduced by the filter (56).
It is possible to prevent the filter 56 from being crushed and broken by the tightening force of the string-like member 58 without directly acting on the surface of the above, and to reliably ensure the filter function of the filter 56.

According to a third aspect of the present invention, in the first aspect, the refrigerant outlet pipe (52) is fitted and held in the bottom portion (52c) of the refrigerant outlet pipe (52) so as to overlap with the oil return hole (55). 55) is provided with a ring-shaped filter (56) for removing foreign matter sucked therein, and the inner surface of the inverted U shape of the desiccant (57) is larger than the circumferential length (L2) of the outer peripheral surface of the filter (56). Is lengthened (L1).

Thus, the inverted U-shaped ends (57b, 57c) of the desiccant (57) are located on the radially outer side of the refrigerant outlet pipe (52) than the filter (56). Similarly, the filter function of the filter 56 can be surely guaranteed.

According to the invention of claim 4, claim 1
1 to 3, the string-like member (58) is separated from the desiccant (57), and the separate string-like member (5).
8) may be wrapped around the entire circumference of the inverted U-shaped outer surface of the desiccant (57).

According to the invention of claim 5, claim 1
1 to 3, the string-like member (58) may be integrally formed with the desiccant (57).

According to the sixth aspect of the present invention, the tank main body (50) which is disposed on the suction side of the compressor (1) of the refrigeration cycle to separate the gas and liquid of the refrigerant and store the liquid refrigerant, and the refrigeration cycle Refrigerant from the outlet of the evaporator (4) is supplied to the tank body (5
0) and a U-shaped refrigerant outlet pipe (52) arranged in the tank body (50).
And a gas refrigerant suction part (52b) provided on the upper part of the refrigerant outlet pipe (52) for sucking the gas refrigerant in the upper part of the tank body (50), and near the bottom part (52c) of the refrigerant outlet pipe (52). An oil return hole (55) provided in the lower part of the tank body (50) for sucking the liquid refrigerant and lubricating oil, and a desiccant (57) for adsorbing the water in the tank body (50).
And a desiccant (5
7), and a desiccant (57) is further added to the refrigerant outlet pipe (5).
The pressing means (5) for pressing toward the upper surface of the bottom of (2)
8, 59) is provided in the refrigerant outlet pipe (52).

As a result, the desiccant (57) arranged on the upper surface of the bottom of the refrigerant outlet pipe (52) is pressed by the pressing means (58, 5).
The desiccant (57) can be reliably fixed to the bottom upper surface of the refrigerant outlet pipe (52) by a simple method of pressing it toward the bottom upper surface of the refrigerant outlet pipe (52) by 9).

Moreover, since the desiccant (57) is attached to the bottom portion (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is placed in the liquid refrigerant in the lower portion of the tank body (50). As a result, oil return to the compressor (1) can be favorably maintained, and the lubricity of the compressor (1) can be favorably ensured.

According to the invention described in claim 7, claim 6
In, the pressing means can be configured by a string-like member (58) that is fastened between the two pipe portions (52d, 52e) of the U-shaped refrigerant outlet pipe (52).

Further, as in the invention described in claim 8, in claim 6, the pressing means may be constituted by a plate-like member (59) fixed to the refrigerant outlet pipe (52).

According to the ninth aspect of the present invention, the tank main body (50) which is arranged on the suction side of the compressor (1) of the refrigeration cycle to separate the gas and liquid of the refrigerant and store the liquid refrigerant, and the refrigeration cycle Refrigerant from the outlet of the evaporator (4) is supplied to the tank body (5
0) and a U-shaped refrigerant outlet pipe (52) arranged in the tank body (50).
And a gas refrigerant suction part (52b) provided on the upper part of the refrigerant outlet pipe (52) for sucking the gas refrigerant in the upper part of the tank body (50), and near the bottom part (52c) of the refrigerant outlet pipe (52). An oil return hole (55) provided in the lower part of the tank body (50) for sucking the liquid refrigerant and lubricating oil, and a desiccant (57) for adsorbing the water in the tank body (50).
And the desiccant (57) has a bag-shaped member (57a) containing a water adsorbent, and the bag-shaped member (57a) is provided with two through holes (57b). 57b) by inserting a U-shaped refrigerant outlet pipe (52),
Apply the desiccant (57) to the bottom (52c) of the refrigerant outlet pipe (52).
It is characterized in that it is attached so as to cover the upper surface.

With this, only by inserting the U-shaped refrigerant outlet pipe (52) into the two through holes (57b) provided in the bag-shaped member (57a) of the desiccant (57), other holding means can be obtained. The desiccant (57) can be attached to and held in the bottom portion (52c) of the refrigerant outlet pipe (52) very simply without using.

Moreover, since the desiccant (57) is attached to the bottom portion (52c) of the U-shaped refrigerant outlet pipe (52), the oil return to the compressor (1) is good as in claims 1 and 6. Therefore, the lubricity of the compressor (1) can be well secured.

According to a tenth aspect of the invention, in any one of the sixth to ninth aspects, the oil return hole (55)
And a filter (56) which is arranged so as to overlap with the oil return hole (55) and removes foreign matters sucked into the oil return hole (55), and at least around the oil return hole (55) in the bottom portion (52c) of the refrigerant outlet pipe (52). Filter (5
It is characterized in that a desiccant (57) is attached in an inverted U shape from the upper part of 6). According to this, at least the oil return hole (55) is formed in the bottom portion (52c) of the refrigerant outlet pipe (52).
Since the desiccant (57) is attached in an inverted U shape from the upper part to the part excluding the periphery of the liquid refrigerant in the lower part of the tank main body part (50),
The oil can be smoothly sucked into the oil return hole (55) without being blocked by the desiccant (57).
Moreover, since the desiccant (57) is attached to the bottom portion (52c) of the U-shaped refrigerant outlet pipe (52), the entire desiccant (57) is immersed in the liquid refrigerant in the lower portion of the tank body (50). be able to. As a result, even when oil is temporarily trapped in the desiccant (57), the trapped oil can flow back to the compressor (1) side again through the surrounding liquid refrigerant. Therefore,
Good oil return to the compressor (1) can be maintained.

Further, 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 main body (50), it has an inverted U shape. The required amount of the water adsorbent can be secured depending on the form.

The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiments described later.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a refrigeration cycle of a vehicle air conditioner according to a first embodiment, in which a 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 heat-exchanged with the outside air to be cooled and condensed.

Then, the liquid refrigerant condensed in the condenser 2 is then decompressed to a low pressure by the decompression device 3 and becomes a mist-like gas-liquid two-phase state. The decompression device 3 is a fixed throttle such as a capillary tube, an orifice, or a nozzle, or an appropriate variable throttle that responds to the state (pressure, temperature) of the refrigerant on the high pressure side of the cycle.
Alternatively, it consists of a combination of a fixed diaphragm and a variable diaphragm. The reduced pressure low-pressure refrigerant absorbs heat from the blown air of an air-conditioning blower (not shown) in the evaporator 4 and evaporates.

The evaporator 4 is arranged in an air conditioning case (not shown) in the indoor unit of the vehicle air conditioner, and the evaporator 4
As is well known, the cold air cooled in (1) is blown out into the passenger compartment after its temperature is adjusted by a heater core (not shown). The refrigerant that has passed through the evaporator 4 is separated into gas and liquid by the accumulator 5 and then taken into the compressor 1.

The accumulator 5 separates the gas-liquid of the refrigerant from the outlet of the evaporator 4 and collects the liquid refrigerant to convert the gas refrigerant into the compressor 1.
And the oil dissolved in the liquid refrigerant accumulated on the tank bottom side is sucked into the compressor 1.

FIG. 2 and FIG. 3 exemplify a concrete structure of the accumulator 5 according to the first embodiment. The accumulator 5 has a tank body 50 formed in a vertically long cylindrical shape extending in the vertical direction. There is. This tank body 50
In this example, the upper tank 50a and the lower tank 50b, which are formed of metal such as aluminum, are integrally joined by joining means such as welding.

A refrigerant inlet pipe 51 is arranged so as to penetrate the upper surface of the tank body 50. The refrigerant inlet pipe 51 is
A refrigerant inflow portion is formed that allows the refrigerant from the outlet of the evaporator 4 to flow into the tank body 50. In addition, a coolant outlet pipe 52 bent in a U shape is arranged inside the tank body 50, and one end 52a of the coolant outlet pipe 52 penetrates the upper surface of the tank body 50 to the outside of the tank. It is arranged so that it can be taken out. The one end 52a is connected to the suction side of the compressor 1.

The other end (upper end) 52b of the U-shape of the refrigerant outlet pipe 52 is an upper portion inside the tank main body 50, and is directly opened to a bowl-shaped lower space of the gas-liquid separating plate 53. The upper end opening constitutes a gas refrigerant suction portion for sucking the gas refrigerant in the upper portion inside the tank body 50.

The gas-liquid separating plate 53 is arranged above the inside of the tank main body 50 with a predetermined distance from the lower end opening of the refrigerant inlet pipe 51. The gas-liquid separating plate 53 is formed in a bowl shape in which the central portion is high and the outer peripheral edge portion hangs down. The gas-liquid separation plate 53 is formed of metal or resin and has a through hole through which the one end portion 52a of the refrigerant outlet pipe 52 passes.
The gas-liquid separating plate 53 is fixed to the refrigerant outlet pipe 52 at the through hole portion. Further, a gap 54 is formed between the outer peripheral edge of the gas-liquid separating plate 53 and the inner wall surface of the tank main body 50 to allow the refrigerant to pass therethrough.

Both the refrigerant inlet pipe 51 and the refrigerant outlet pipe 52 are made of metal such as aluminum. The refrigerant inlet pipe 51 is inserted into a through hole in the upper surface of the tank body 50, and is fixed to the through hole by a joining means such as welding. Further, one end portion (upper end portion) 52a of the refrigerant outlet pipe 52 is inserted into a through hole in the upper surface portion of the tank body 50, and is fixed to the through hole portion by a joining means such as welding.

On the lower surface of the bottom portion 52c of the U-shaped refrigerant outlet pipe 52, an oil return hole 55 consisting of a minute circular hole having a diameter of about 1 mm is formed. Further, a filter 56 is attached to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 so as to overlap with the opening position of the oil return hole 55.

Therefore, the lubricating oil accumulated in the lower portion of the tank main body 50 is passed through the filter 56 and the oil return hole 55.
Can be sucked into the refrigerant outlet pipe 52. Since the lubricating oil is actually dissolved in the liquid refrigerant, the liquid refrigerant flows from the oil return hole 55 to the refrigerant outlet pipe 52 together with the lubricating oil.
Will be inhaled inside. Since the foreign matter in the refrigerant can be removed by the filter 56, it is possible to prevent the oil return hole 55, which is a minute hole, from being blocked by the foreign matter in the refrigerant.

As shown in FIGS. 4 and 5, this filter 56 is formed in a ring shape in this embodiment, and is fitted and held in the refrigerant outlet pipe 52. The filter 56 is specifically made of a resin-made fine mesh member (mesh member),
The ring shape of the mesh member is reinforced by reinforcing pieces 56a arranged at equal intervals of 120 °.

Further, the bottom portion 52 of the U-shaped refrigerant outlet pipe 52 is provided.
A desiccant 57 is placed near c. This desiccant 57 is
A granular water adsorbent such as zeolite is used as the bag-shaped member 57a.
It is stored inside. The bag-shaped member 57a is formed of a breathable and soft cloth-like material such as felt.

As shown in FIGS. 4 and 5, the desiccant 57 is U
The filter 56 is attached to the bottom portion 52c of the V-shaped refrigerant outlet pipe 52.
It is attached in an inverted U shape so that it can be covered from above. Here, 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.
Therefore, in a state immediately after the desiccant 57 is covered on the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 from the upper portion of the filter 56 in the inverted U shape, the inverted U-shaped end portions 57 of the desiccant 57 as shown in FIG.
b and 57c project to the radially outer side of the refrigerant outlet pipe 52 with respect to the filter 56 by a predetermined amount α.

The desiccant 57 is added to the bottom portion 52c of the refrigerant outlet pipe 52.
Since it is mounted in an inverted U shape from the top to the bottom, the periphery of the oil return hole 55 opening on the lower surface of the bottom portion 52c of the refrigerant outlet pipe 52 is not covered with the desiccant 57. Therefore, the desiccant 57 does not hinder the suction of the lubricating oil into the oil return hole 55.

In FIG. 4, the cord-like member 58 is a desiccant 57.
Is a fastening (band) member that is fastened to and fixed to the bottom portion 52c of the refrigerant outlet pipe 52. The string-shaped member 58 is made of resin or the like, and has a pipe-shaped locking portion 58a at one end thereof.
have. Locking claws are formed on the inner surface of the pipe-shaped locking portion 58a. The cord-like member 58 is wound so as to cover the entire circumference of the outer surface of the desiccant 57 having the inverted U shape, and then the other end of the cord-like member 58 is inserted into the pipe-shaped locking portion 58a of the one end. Then, by pulling the other end of the string-like member 58, the tightening force of the string-like member 58 is reduced by the desiccant 5.
7, the desiccant 57 is added to the bottom portion 52 of the refrigerant outlet pipe 52.
Can be tightened and fixed to c.

Even if the tightening force of the other end of the string-like member 58 is released, the pipe-like engaging part 58a is attached to the other end of the string-like member 58.
The engaging state of the desiccant 57 can be maintained by the engaging claws on the inner surface of the. Note that FIG. 4 shows a state after the other end (unnecessary portion) of the string-shaped member 58 protruding from the pipe-shaped locking portion 58a is cut.

Next, the function and effect of the first embodiment will be described. (1) The desiccant 57 is added to the bottom portion 5 of the U-shaped refrigerant outlet pipe 52.
Reverse U to cover 2c from above filter 56
Since the desiccant 57 is fastened and fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 by the string-shaped member 58, the desiccant 57 is securely fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52. it can. Therefore, the desiccant 57 does not move due to vibration of the vehicle or the like to cause the refrigerant liquid level in the tank body 50 to bubble.

(2) The desiccant 57 is added to the U-shaped refrigerant outlet pipe 52.
When the desiccant 57 is attached to the bottom portion 52c in the inverted U shape, the length L1 of the inner surface of the desiccant 57 having the inverted U shape is made longer than the circumferential length L2 of the outer peripheral surface of the filter 56. As shown in FIG. 5, both ends 57b and 57c of the inverted U shape are protruded by a predetermined amount α toward the radially outer side (lower side) of the refrigerant outlet pipe 52 than the filter 56. When the agent 57 is tightened and fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52, the tightening force of the string-like member 58 is applied to the filter 5
I rarely join 6 directly. Therefore, even if the desiccant 57 is covered from above the filter 56 and tightened and fixed, it is possible to prevent the filter 56 from being crushed and damaged by the tightening force of the string-like member 58, and the filter 5
The filter function of 6 can be surely guaranteed.

(3) The desiccant 57 is added to the U-shaped refrigerant outlet pipe 52.
Since the filter 52 is attached to the bottom 52c of the filter 56 in an inverted U shape, the desiccant 57 does not cover the lower surface of the filter 56 and the periphery of the oil return hole 55. Therefore,
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.

(4) The desiccant 57 is added to the U-shaped refrigerant outlet pipe 52.
Since the bottom portion 52c is mounted in an inverted U shape, the entire desiccant 57 can be immersed in the liquid refrigerant in the lower portion inside the tank body 50.

Here, if the desiccant 57 is the tank body 5
When exposed to the gas refrigerant area in the upper part of 0, the oil remains trapped in the desiccant 57 in the exposed part of the gas refrigerant area, and the oil does not move into the liquid refrigerant in the lower part of the tank body 50. The trapped oil of the desiccant 57 cannot be returned to the compressor 1 and causes insufficient lubrication of the compressor 1.

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 trapped by the desiccant 57, the trapped oil is again recirculated to the surrounding liquid refrigerant. Can be returned to the compressor 1 side.

Moreover, 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 main body 50, the desiccant 57 is formed in the inverted U-shape so that the moisture adsorbent is It is easy to secure the required amount.

(Second Embodiment) In the first embodiment, a desiccant 57, which is 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. However, in the second embodiment, as shown in FIG.
7 in the longitudinal direction of the bag-shaped member 57a of No. 7
Are attached in advance. Then, the desiccant 57 is added to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 as in the first embodiment.
Then, the desiccant 57 is fastened and fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 by fastening the string-shaped members 58 at both ends.

(Third Embodiment) In the third embodiment, FIG.
As shown in FIG. 7, a string-like member 58 is integrally attached to one end of the bag-like member 57a of the desiccant 57 in the longitudinal direction in advance, and a large number of fine hook-shaped engaging portions are provided at the tip end of the string-like member 58. A tape-shaped locking member 58b is provided. The tape-shaped locking member 58b is generally called a magic tape (registered trademark).

Then, the desiccant 57 is added to the U-shaped refrigerant outlet pipe 5.
After attaching to the bottom 52c of No. 2 in an inverted U shape, the string-like member 58
While tightening the tape-shaped locking member 58b at the tip end of the desiccant 57, the desiccant 57 is locked on the surface of the bag-shaped member 57a,
Is fastened and fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52.

(Fourth Embodiment) In the first to third embodiments, after the desiccant 57 is attached to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 in an inverted U shape, the tightening force of the string-like member 58 is dried. The desiccant 57 is tightened and fixed to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 by directly acting on the desiccant 57.
In the embodiment, the desiccant 57 is held on the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 in a form in which the tightening force of the string-shaped member 58 does not directly act on the desiccant 57.

FIG. 8 shows the fourth embodiment, where U
A ring-shaped filter 56 is fitted and held on the bottom portion 52c of the U-shaped refrigerant outlet pipe 52, and the bottom portion 52 of the U-shaped refrigerant outlet pipe 52 is held.
A desiccant 57 is mounted in an inverted U shape on the upper surface side of c via a filter 56.

Then, the same string-like member 5 as in the first embodiment.
8 above the desiccant 57, the U-shaped refrigerant outlet pipe 52
Cross over between the two pipe parts 52d, 52e of
tighten. The desiccant 57 is transferred to the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 by the cross-shaped bridging portion of the string-shaped member 58.
The desiccant 57 is held on the bottom 52c of the U-shaped refrigerant outlet pipe 52 by pressing it toward the upper surface. That is, in the fourth embodiment, the string-like member 58 having the crossing over portion.
This constitutes a pressing means for the desiccant 57.

In the fourth embodiment, the pipe portion 52
By forming a concavo-convex surface on the surfaces of d and 52e and engaging the string-like member 58 with the concavo-convex surface, it is possible to easily prevent fluctuations in the tightening position of the string-like member 58 with respect to the pipe portions 52d and 52e. This makes it possible to obtain an even more preferable configuration.

(Fifth Embodiment) The fifth embodiment is the same as the fourth embodiment.
According to the same concept as that of the embodiment, as shown in FIG. 9, a plate-shaped pressing member 59 is used in place of the string-shaped member 58, and the plate-shaped pressing member 59 removes the desiccant 57 from the U-shape.
The desiccant 57 is pressed down toward the upper surface of the bottom portion 52c of the U-shaped refrigerant outlet pipe 52, and the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 is pressed.
Hold on.

The plate-shaped pressing member 59 may be made of metal or resin. In the case of metal, one end of the plate-shaped pressing member 59 is U-shaped by means such as welding, brazing, or caulking. The pipe portion 52d (or the pipe portion 5 of the refrigerant outlet pipe 52)
Fix to 2e). Further, when the plate-shaped pressing member 59 is made of resin, one end of the plate-shaped pressing member 59 is connected to the pipe portion of the U-shaped refrigerant outlet pipe 52 by a press-fit locking structure or the like utilizing elastic deformation of the resin. You may make it fix to 52d (or pipe part 52e).

(Sixth Embodiment) The sixth embodiment is the same as the first embodiment.
The desiccant 57 is held on the bottom portion 52c of the U-shaped refrigerant outlet pipe 52 by a means different from the fifth embodiment.

FIG. 10 (a) shows a desiccant 57 according to the sixth embodiment, and two through holes 57b are provided in the longitudinal center of the bag 57a of the desiccant 57. In the sixth embodiment, after the ring-shaped filter 56 is fitted and held on the bottom portion 52c of the U-shaped refrigerant outlet pipe 52, the desiccant 57 is
The two desiccants 52d and 52e of the U-shaped refrigerant outlet pipe 52 are inserted into the two through holes 57b of the desiccant 57 from the upper portion of the filter 56 to the bottom portion 5 of the refrigerant outlet pipe 52.
It is mounted in an inverted U shape so as to cover the upper surface of 2c. Figure 10
(B) shows a state in which the desiccant 57 is attached to the bottom portion 52 c of the refrigerant outlet pipe 52.

(Other Embodiments) Needless to say, the accumulator according to the present invention can be applied not only to vehicles but also to various applications.

[Brief description of 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 vertical cross-sectional view of the accumulator according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of the accumulator according to the first embodiment, showing a cross-sectional shape of a refrigerant inlet / outlet pipe.

FIG. 4 is an explanatory view showing the 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 simple substance according to a second embodiment.

FIG. 7 is a front view of a desiccant simple substance according to a third embodiment.

8A is an explanatory view of a desiccant pressing structure according to a fourth embodiment, FIG. 8B is a top view of FIG. 8A, and shows a cross-sectional view of a refrigerant outlet pipe.

FIG. 9 is an explanatory view of a desiccant pressing 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 of a state in which 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-shaped member.

Claims (10)

[Claims] 1. A tank body (50) arranged on the suction side of a compressor (1) of a refrigeration cycle to separate a gas-liquid refrigerant and store a liquid refrigerant, and an evaporator (4) outlet of the refrigeration cycle. The refrigerant inflow part (5) for allowing the refrigerant from the inside to flow into the tank body part (50).
1), a U-shaped refrigerant outlet pipe (52) arranged in the tank body portion (50), and an upper portion inside the tank body portion (50) provided on the refrigerant outlet pipe (52). And a gas refrigerant suction portion (52b) for sucking the gas refrigerant and a bottom portion (52c) of the refrigerant outlet pipe (52) for sucking the liquid refrigerant and lubricating oil in the lower portion of the tank body (50). An oil return hole (55) and a desiccant (57) for adsorbing water in the tank body (50) are provided, and at least the oil return hole (55) is provided at the bottom (52c) of the refrigerant outlet pipe (52). ), The desiccant (57) is mounted in an inverted U shape from above, and the desiccant (57) is attached to the bottom (52c) of the refrigerant outlet pipe (52) by a string-like member (58). Aki characterized by tightening and fixing Suit of Lights. 2. A filter (56), which is disposed so as to overlap with the oil return hole (55) and removes foreign matter sucked into the oil return hole (55), and reverses the desiccant (57). When mounted in a U shape, the inverted U-shaped both ends (57b, 57c) of the desiccant (57) are positioned on the radially outer side of the refrigerant outlet pipe (52) than the filter (56). The accumulator according to claim 1, wherein: 3. A bottom portion (52) of the refrigerant outlet pipe (52).
c) is provided with a ring-shaped filter (56) which is fitted and held so as to overlap with the oil return hole (55) and removes foreign matter sucked into the oil return hole (55). ), The length (L) of the inner surface of the inverted U-shape of the desiccant (57) is larger than the length (L2) of the outer peripheral surface.
The accumulator according to claim 1, wherein 1) is lengthened. 4. The cord-like member (58) is provided with the desiccant (5).
The accumulator according to any one of claims 1 to 3, which is separate from 7) and is wound around the entire outer surface of the desiccant (57) having an inverted U-shape. 5. The cord-like member (58) is made of the desiccant (5).
7. It is integrally formed with 7).
The accumulator according to any one of 1 to 3. 6. A tank body (50) arranged on the suction side of a compressor (1) of a refrigeration cycle to separate a gas-liquid refrigerant and store a liquid refrigerant, and an outlet (4) of the evaporator (4) of the refrigeration cycle. The refrigerant inflow part (5) for allowing the refrigerant from the inside to flow into the tank body part (50).
1), a U-shaped refrigerant outlet pipe (52) arranged in the tank body portion (50), and an upper portion inside the tank body portion (50) provided on the refrigerant outlet pipe (52). And a gas refrigerant suction portion (52b) for sucking the gas refrigerant and a bottom portion (52c) of the refrigerant outlet pipe (52) for sucking the liquid refrigerant and lubricating oil in the lower portion of the tank body (50). An oil return hole (55) and a desiccant (57) for adsorbing water in the tank body (50) are provided, and the desiccant (5) is provided on the bottom surface of the refrigerant outlet pipe (52).
7) is arranged, and the refrigerant outlet pipe (52) is further provided with a pressing means (58, 59) for pressing the desiccant (57) toward the upper surface of the bottom of the refrigerant outlet pipe (52). Accumulator to do. 7. The holding means is a cord-like member (58) mounted between two pipe portions (52d, 52e) of the U-shaped refrigerant outlet pipe (52). 6
Accumulator described in. 8. The holding means comprises the refrigerant outlet pipe (5).
Accumulator according to claim 6, characterized in that it is a plate-shaped member (59) fixed to 2). 9. A tank body (50) arranged on the suction side of a compressor (1) of a refrigeration cycle to separate a gas-liquid refrigerant and store a liquid refrigerant, and an outlet (4) of the evaporator (4) of the refrigeration cycle. The refrigerant inflow part (5) for allowing the refrigerant from the inside to flow into the tank body part (50).
1), a U-shaped refrigerant outlet pipe (52) arranged in the tank body portion (50), and an upper portion inside the tank body portion (50) provided on the refrigerant outlet pipe (52). And a gas refrigerant suction portion (52b) for sucking the gas refrigerant and a bottom portion (52c) of the refrigerant outlet pipe (52) for sucking the liquid refrigerant and lubricating oil in the lower portion of the tank body (50). An oil return hole (55) and a desiccant (57) for adsorbing moisture in the tank body (50) are provided, and the desiccant (57) is a bag-shaped member (57a) containing a moisture adsorbent. By providing two through holes (57b) in the bag-shaped member (57a) and inserting the U-shaped refrigerant outlet pipe (52) into the two through holes (57b), A desiccant (57) is added to the bottom portion (52) of the refrigerant outlet pipe (52). ) Accumulator, characterized in that mounted so as to cover the upper surface. 10. The refrigerant outlet pipe (52) is provided with a filter (56) arranged to overlap with the oil return hole (55) to remove foreign matter sucked into the oil return hole (55). 10. The desiccant (57) is installed in an inverted U shape from the upper part of the filter (56) at a portion except at least the periphery of the oil return hole (55) in the bottom portion (52c). The accumulator according to any one of 1.