JP2004132627A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the spatial merit and simplify the piping in an accumulator constituted to prevent the counter flow of a refrigerant to an evaporator or the like arranged on the upstream side by building a check valve in the accumulator. <P>SOLUTION: This accumulator A comprises a refrigerant inlet 21, a refrigerant outlet 22, and a storage chamber 13. A check valve part 30 communicating with the refrigerant inlet 21 is arranged within the storage chamber 13, and the outflow port 35a of the valve part 30 is allowed to communicate with the storage chamber 13. The storage chamber 13 is formed of a cup-like sealed container 10 and a lid body 20 welded to the sealed container 10, and the refrigerant inlet 21 and the refrigerant outlet 22 are formed in the lid body 20. The check valve part 30 is installed to the lid body 20 while communicating with the refrigerant inlet port 21. A fluid guide part 50 for feeding the refrigerant from the storage chamber 13 to the refrigerant outlet 22 is installed to the lid body 20 while communicating with the refrigerant outlet 22. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an accumulator used for a refrigeration cycle or the like, and more particularly, to an accumulator having a built-in check valve.
[0002]
[Prior art]
In a refrigerating cycle of an air conditioner or the like, a four-way valve for switching between cooling and heating, an outdoor heat switch, a throttle device, an indoor heat exchanger, and an accumulator are sequentially connected to a discharge side of a compressor via a refrigerant circulation circuit. (See Patent Document 1).
During the operation of such a refrigeration cycle, a phenomenon may occur in which unevaporated liquid refrigerant comes out of the evaporator. This occurs when the heat load in the evaporator changes and the liquid refrigerant cannot completely evaporate in the evaporator. If the amount of the liquid refrigerant is large as described above, liquid compression occurs in the compressor.Therefore, usually, an accumulator is provided on the suction side of the compressor so as not to impose a load on the compressor, and the liquid refrigerant which is not evaporated by the accumulator is provided. Is separated and the gas is sucked into the compressor.
[0003]
Normally, the indoor evaporator is used in a low pressure state during the refrigeration cycle. However, when the compressor is stopped, the high-pressure refrigerant flows backward, and the back-flowed refrigerant reaches the indoor heat exchanger and may damage the indoor heat exchanger. Therefore, it has been desired to provide a means for preventing the refrigerant from flowing back into the indoor heat exchanger on the upstream side in the accumulator. Further, in this accumulator, even if the backflow preventing means is realized, it has been desired to realize an accumulator which can be arranged even in a narrow space of an automobile and has few failures and high thermal efficiency.
[0004]
[Patent Document 1]
JP-A-8-5204 (paragraph number (0027) -paragraph number (0040) and FIG. 1).
[0005]
[Problems to be solved by the invention]
An object of the present invention is to fulfill the above-mentioned demand, and to provide an accumulator for a refrigeration cycle or the like which prevents reverse flow of a fluid, enables its placement even in a narrow space such as an automobile interior, and has few failures and high thermal efficiency. To provide.
[0006]
[Means to solve the problem]
The present invention takes the following measures to achieve the above object. That is,
The accumulator according to claim 1, wherein the accumulator includes a refrigerant inlet, a refrigerant outlet, and a storage chamber, wherein a check valve communicating with the refrigerant inlet is disposed in the storage chamber, and an outlet hole of the check valve is provided. Is connected to the storage chamber, so that a reverse flow of the fluid from the refrigerant outlet to the refrigerant inlet does not occur and a space for the check valve portion is not required.
[0007]
The accumulator according to claim 2 is the accumulator according to claim 1, wherein the storage chamber is formed of a cup-shaped closed container and a lid welded to the closed container. A refrigerant outlet is formed, and a check valve portion is mounted on the lid in communication with the refrigerant inlet, and a fluid guide portion for sending refrigerant from the storage chamber to the refrigerant outlet is connected to the refrigerant outlet to form a lid. , The configuration is simplified, and attachment / detachment management such as assembling / removal of the accumulator is facilitated.
The accumulator according to a third aspect is the accumulator according to the first or second aspect, wherein the check valve portion includes a valve body support having a two-stage pressure-receiving surface in a check direction. The stop is performed quickly.
[0008]
In the accumulator according to a fourth aspect, in the accumulator according to the first to third aspects, the fluid guide portion is formed of a double pipe of an inner pipe and an outer pipe, and the outer pipe is provided at an upper portion of the outer pipe. A fluid guide tube communicating with the chamber, wherein the inner tube circulates with the inside of the outer tube at a lower portion of the inner tube and communicates with a refrigerant outlet at an upper portion of the outer tube, thereby simplifying the configuration. .
In the accumulator according to the fifth aspect, in the accumulator according to the first to fourth aspects, when the pressure equalizing hole is formed in the inner pipe, the position where the pressure equalizing hole is formed is determined by setting the outer pipe to the storage chamber at an upper portion thereof. By setting the communication positions, the differential pressure between the refrigerant pressure in the inner pipe and the refrigerant pressure in the storage chamber is easily eliminated.
[0009]
According to a sixth aspect of the present invention, in the accumulator according to the fifth aspect, an oil return hole is provided in a communication part in which the lower part of the inner pipe circulates with the inside of the outer pipe to communicate the communication part with the storage chamber. Even when only a minimum amount of refrigerating machine oil is present in the storage chamber 13, the refrigerating machine oil is supplied to and mixed with the refrigerant gas through the oil return hole.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view (AA sectional view of FIG. 2) of the accumulator according to the first embodiment, FIG. 2 is a plan view seen from the direction of arrow B of FIG. 1, and FIG. 3 is a CC sectional view of FIG. FIG. 4 is a bottom view seen from the direction of arrow D in FIG. 1, and FIG. 5 is an operation explanatory view of the embodiment, showing a check valve portion in an open state (A) and a closed state (B).
[0011]
The accumulator A of the first embodiment is disposed in a cup-shaped closed container 10, a lid 20 welded and fixed to the upper portion of the closed container 10 as a weld 26, and a storage chamber 13 formed by these members. A check valve portion 30 and a fluid guide portion 50 juxtaposed with the check valve portion 30 in the storage chamber 13.
[0012]
The closed container 10 is made of a metal material having a predetermined thickness, and as shown in FIG. A lid 20 having the same diameter as the outer diameter of the sealed container 10 and having a constant thickness is welded to the upper end portion 12 (welded portion 26).
[0013]
As shown in FIGS. 1 and 2, the lid 20 is provided with a circular refrigerant inlet 21 and a refrigerant outlet 22, and a mounting hole 27 is formed near the refrigerant inlet 21 and the refrigerant outlet 22. Further, a check valve mounting cylindrical portion 23 is formed integrally with the lower part of the refrigerant inlet 21 so as to protrude into the storage chamber 13, and a check valve portion 30 described later is mounted by protruding from the check valve mounting cylindrical portion 23. Is done. Further, an inner tube mounting tube portion 24 is integrally formed in the storage chamber 13 below the refrigerant outlet 22 so as to protrude therefrom, and a fluid guide portion 50 described later is attached to the inner tube mounting tube portion 24. .
[0014]
The check valve portion 30 is entirely formed of a tubular body having a predetermined length up and down, housed in a check valve case 31, an upper portion thereof is formed of a small-diameter fitting tubular portion 31a, and a lower portion thereof is formed of a main body. The part 31b is constituted. The upper end of the fitting tubular portion 31a communicates with the refrigerant inlet 21, and the lower portion of the main body 31b communicates with the storage chamber 13. The step on the inner wall between the fitting cylinder 31a and the main body 31b constitutes a valve seat 37, and a check valve chamber 36 is formed inside the main body 31b. A bottom plate 35 is attached to a lower end of the main body 31b.
[0015]
In the check valve chamber 36, a ball valve 40 and a support 41 for holding the ball valve 40 in a ball holding portion 44 are arranged. The ball valve 40 is a perfect circular sphere, and the support body 41 is formed in a substantially square shape with a horizontal cross section as shown in FIG. 3, and each corner is formed in a cylindrical surface shape so as to abut the inner wall of the main body 31b. A space (gap) through which the refrigerant can flow is formed between the side portion 45 of the support 41 and the main body 31b.
[0016]
Also, as shown in FIGS. 1, 5 (A) and (B), the lower end surface of the support body 41 is formed with a flat end surface contact portion 43 protruding from the center portion thereof. The part is formed as a back pressure receiving part 42. The ball valve 40 and the support body 41 are integrally slidable up and down inside the check valve mounting cylinder 23.
Further, as shown in FIG. 4, four outflow holes 35a are formed in a bottom plate 35 made of a disk mounted on the lower end of the check valve mounting cylindrical portion 23. In this case, a contact receiving portion 35b is formed in which the contact portion 43 comes into contact when the contact portion 43 moves downward.
[0017]
Therefore, as shown in FIG. 5A, when the check valve chamber 36 and the support 41 are at the lowest position, the refrigerant pressure in the storage chamber 13 acts on the reverse pressure receiving portion 42 through the outflow hole 35a. Will be. Further, when the support 41 is slightly separated from the bottom plate 35 and becomes the state shown in FIG. 5B, the refrigerant pressure in the storage chamber 13 acts on the flat surface of the contact portion 43 in addition to the back pressure receiving portion 42, The refrigerant pressure acts greatly on the support 41.
[0018]
The fluid guide section 50 separates the refrigerant into a gas refrigerant and a liquid refrigerant in the storage chamber 13 and discharges the gas refrigerant. As shown in FIG. Is fitted and mounted. The fluid guide portion 50 has a predetermined length vertically and includes an inner tube 51 and an outer tube 52. The inner tube 51 has an upper portion 51a of the inner tube fitted and fixed to the inner tube mounting tube portion 24, and an upper support 53 mounted on the outer periphery thereof. The upper support 53 has an umbrella-shaped fluid guide portion 53a and supports an outer tube upper portion 52a described later. The inner tube lower part 51b is supported by a lower support 54, and the lower support 54 is disposed and supported on the upper surface of the bottom 11.
[0019]
Further, a pressure equalizing hole 51c is formed near the upper portion 51a of the inner tube 51. An outer tube 52 having a diameter larger than that of the inner tube 51 is arranged concentrically with the inner tube 51. The outer tube 52 forms a fluid guide tube, and the upper portion 52a of the outer tube is supported by the upper support 53, and allows the space in the outer tube 52 to communicate with the storage chamber 13. Further, the pressure equalizing hole 51c is formed at a height position of the communication portion x.
[0020]
As shown in FIG. 1, the lower portion 52b of the outer tube is supported by the lower support 54 and communicates with the inside of the inner tube 51 via a communication hole 56 formed in the lower support 54. Further, the communication hole 56 communicates with the bottom of the storage chamber 13 through an oil return hole 55 provided on a side portion thereof.
By this fluid guide portion 50, the gas refrigerant in the storage chamber 13 is guided by the fluid guide portion 53a to move downward in the space between the outer pipe 52 and the inner pipe 51, and then makes a U-turn in the communication hole 56 to make the inside. Only the gas refrigerant flows into the pipe 51 via the refrigerant outlet 22 and reaches the compressor.
[0021]
In the refrigerating cycle in which the refrigerant inlet 21 of the accumulator A is connected to the evaporator and the refrigerant outlet 22 is connected to the compressor by pipes, the refrigerant that first reaches the refrigerant inlet 21 is shown in FIG. 1 and FIG. As described above, when the ball valve 40 is moved downward, it reaches the storage chamber 13 through the inflow port 32, the check valve chamber 36, and the outflow hole 35a. It will be supplied from the outlet 22 to the compressor.
At this time, when the refrigerant pressure in the storage chamber 13 becomes higher than the refrigerant inlet 21, for example, when the compressor is stopped, conventionally, the refrigerant flows backward through the refrigerant inlet 21 to the indoor evaporator. There was a defect.
[0022]
However, in the first embodiment, when the refrigerant pressure difference exceeds a predetermined value, the support 41 and the ball valve 40 are lifted by the refrigerant pressure, the ball valve 40 abuts on the valve seat 37, and the check valve 30 is closed. In this state, the refrigerant does not flow backward to the refrigerant inlet 21 side, that is, the evaporator side. In addition, when the support 41 is slightly moved upward by the reverse pressure receiving portion 42 and the contact portion 43 formed on the support 41 with respect to the refrigerant pressure difference in the storage chamber 13 which is equal to or more than a predetermined value, the reverse of the refrigerant pressure is immediately performed. Since the area of the pressure receiving portion 42 is increased, the check valve portion 30 is closed in a very short time.
[0023]
Further, in the first embodiment, by providing the equalizing holes 51c, it is possible to extremely easily balance the refrigerant pressure in the inner pipe 51 and the refrigerant pressure in the storage chamber 13 via the equalizing holes 51c. And a smooth operation of the compressor is realized.
Further, since the oil return hole 55 communicating with the bottom of the storage chamber 13 is provided, even when the amount of the refrigerating machine oil is only the lowest level in the storage chamber 13, the refrigerant is supplied through the oil return hole 55. Since the gas can be supplied and mixed, the operation of the compressor becomes smooth.
[0024]
Embodiment 2
Next, a second embodiment will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view of the accumulator according to the second embodiment of the present invention, and FIG. 7 is a plan view from the direction of arrow B in FIG. In the description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals as those shown in FIGS. 1 to 5 in FIGS.
The second embodiment is different from the first embodiment only in the check valve portion 30 'and the attachment portion to the lid 20'. That is, the check valve mounting hole 25 for mounting the check valve portion 30 ′ is formed in the lid 20 ′, and the check valve portion 30 ′ comprises a check valve case 31 ′ having substantially the same diameter. A male screw portion 33 is formed on the upper outer peripheral surface, and a main body portion 31b 'is formed below. A seal groove 34 is formed above the male screw portion 33 in a ring shape. A seal ring is mounted in the seal groove 34 and screwed into the check valve mounting hole 25.
[0025]
A valve seat 37 'is formed above the inner wall of the main body 31b'. The configuration in the check valve chamber 36 formed in the main body 31b ', that is, the configuration of the ball valve 40, the support 41, the bottom plate 35, and the like is the same as that of the first embodiment.
[0026]
With such a configuration, the operation of the second embodiment is basically the same as that of the first embodiment, and the refrigerant flowing from the inflow port 32 usually reaches the storage chamber 13 via the bottom plate 35, and the refrigerant in the storage chamber 13 When the refrigerant pressure becomes higher than a predetermined value, the ball valve 40 comes into contact with the valve seat 37 ', so that the refrigerant does not flow backward. The effect of the second embodiment is that the shape of the lid 20 is simplified and the shape of the check valve case 31 'is simplified, which leads to a reduction in product cost. In the second embodiment, the check valve portion 30 ′ can be attached and detached and replaced without removing the lid 20 ′ from the accumulator A, so that the maintenance of the accumulator can be further improved.
[0027]
【The invention's effect】
Since the present invention is configured as described above, it is possible to prevent the backflow of the fluid and to make it possible to arrange it in a narrow space such as an engine room of an automobile, etc. An accumulator can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an accumulator according to a first embodiment of the present invention (a sectional view taken along line AA in FIG. 2).
FIG. 2 is a plan view from the direction of arrow B in FIG. 1;
FIG. 3 is a sectional view taken along line CC of FIG. 1;
FIG. 4 is a bottom view from the direction of arrow D in FIG. 1;
FIG. 5 is an operation explanatory view of the first embodiment, showing a check valve portion in an open state (A) and a closed state (B).
FIG. 6 is a longitudinal sectional view of the accumulator according to the second embodiment of the present invention (a sectional view taken along line AA in FIG. 7).
FIG. 7 is a plan view from the direction of arrow B in FIG. 6;
[Explanation of symbols]
A: Accumulator 10, closed container 11, bottom 12 (of closed container), upper end 13 (of closed container), storage chamber 20, 20 ', lid 21, refrigerant inlet (example) 1)
22 ··· Refrigerant outlet 23 · · · Check valve mounting cylinder (Example 1)
24 ··· Inner tube mounting cylinder 25 ··· Check valve mounting hole (Example 2)
26, welding part 27, mounting hole 30, 30 'check valve part 31, 31' check valve case 31a, fitting cylinder part 31b, 31b ', main body part 32, inlet 33 ··· Male thread (Example 2)
34 ··· Seal groove (Example 2)
35, bottom plate 35a, outflow hole 35b, contact receiving part 36, check valve chamber 37, 37 ', valve seat part 40, ball valve 41, support body 42, reverse pressure receiving part 43, Contact part 44 Ball holding part 45 Side part 50 Fluid guiding part 51 Inner pipe (fluid outflow pipe)
51a Upper inner pipe 51b Lower inner pipe 51c Equalizing hole 52 Outer pipe (fluid outflow pipe) 52a Upper outer pipe 52b Lower outer pipe 53 Upper support body 53a Fluid Guide part 54..Lower support 55.Oil return hole 56.Communication hole

Claims (6)

An accumulator including a refrigerant inlet, a refrigerant outlet, and a storage chamber, wherein a check valve communicating with the refrigerant inlet is disposed in the storage chamber, and an outflow hole of the check valve communicates with the storage chamber. The accumulator characterized by the above. The storage chamber is formed from a cup-shaped closed container and a lid welded to the closed container, the lid is formed with the refrigerant inlet and the refrigerant outlet, and the refrigerant inlet has a check valve portion. The accumulator according to claim 1, wherein the fluid guide portion mounted on the lid in a communicating state and configured to send the refrigerant from the storage chamber to the refrigerant outlet is mounted on the lid so as to communicate with the refrigerant outlet. . The accumulator according to claim 1 or 2, wherein the check valve portion includes a valve body support having two stages of pressure receiving surfaces in a check direction. The fluid guide section is formed of a double pipe of an inner pipe and an outer pipe, wherein the outer pipe is a fluid guide pipe communicating with the storage chamber at an upper part of the outer pipe, and the inner pipe is formed at a lower part of the inner pipe at an outer part thereof. The accumulator according to any one of claims 1 to 3, wherein the accumulator communicates with the inside of the tube and communicates with a refrigerant outlet at an upper portion of the outer tube. 5. The hole according to claim 1, wherein the pressure equalizing hole is formed in the inner pipe at a position where the outer pipe communicates with the storage chamber at an upper portion thereof. 6. Any accumulator. 6. The accumulator according to claim 5, wherein an oil return hole for communicating the communication part with the storage chamber is provided in a communication part in which the lower part of the inner pipe communicates with the inside of the outer pipe.

Images