JP2012047393A - Expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the pressure of a refrigerant of a freezing cycle, and to reduce the noise of an expansion valve which controls a flow rate of the refrigerant.SOLUTION: An inlet port 321 to which the high-pressure refrigerant is sent and an outlet port 331 are formed at a valve body 30 of the expansion valve, and a valve material 32b which controls an opening of a valve hole 32a is arranged at a valve chamber 25. A throttle member 100 is fixed to the outlet port by a caulking part 334, rectifies the refrigerant flowing out of the side of an evaporator, and reduces the noise caused by the breakage of an air bubble.

Description

  The present invention relates to a temperature sensing mechanism built-in type expansion valve used in a refrigeration cycle.

  Conventionally, for a refrigeration cycle used in an air conditioner or the like mounted on an automobile, a temperature expansion valve with a built-in temperature sensing mechanism that adjusts the passage of refrigerant according to the temperature is used to omit installation space and piping. ing.

  FIG. 11 is a cross-sectional view showing an example of a conventional temperature sensing mechanism built-in type expansion valve. In the valve body 30 having a prismatic shape, the high-pressure liquid refrigerant condensed by the condenser 5 and passed through the receiver 6 is shown. A first passage 32 serving as a passage and a second passage 34 through which the gas phase refrigerant supplied from the refrigerant outlet of the evaporator 8 to the refrigerant inlet of the compressor 4 flows are formed apart from each other. . In addition, 11 is piping.

  In the inlet passage 32, an inlet port 321 for introducing liquid refrigerant, a valve chamber 35 communicating with the inlet port 321, a valve hole 32 a provided in the valve chamber 35, and refrigerant expanded in the valve hole 32 a An outlet port 331 leading out is provided. A valve seat is formed at the inlet of the valve hole 32a, and a valve member 32b is disposed opposite to the valve seat. The valve member 32b is urged toward the valve seat by a compression coil spring 32c. . The lower end of the valve chamber 35 opens to the bottom surface of the valve body 30 and is sealed by a plug 37 screwed to the valve body 30.

  A valve member driving device 36 for driving the valve member 32 b is attached to the upper end of the valve body 30. The valve member driving device 36 has a pressure operating housing 36d in which the inner space is partitioned into two upper and lower pressure operating chambers 36b and 36c by a diaphragm 36a. The pressure actuating housing 36d communicates with the second passage 34 via a pressure equalizing hole 36e formed concentrically with the center line of the valve hole 32a.

  A valve member drive rod 36f extending from the lower surface of the diaphragm 36a to the valve hole 32a is disposed in the valve body 30. The valve member drive rod 36f is guided by a sliding guide hole provided in a partition wall between the first passage 32 and the second passage 34 in the valve main body 30 so as to be slidable in the vertical direction. 32b. Note that a sealing member 36g for preventing the refrigerant from leaking between the first passage 32 and the second passage 34 is attached to the partition wall.

  The pressure working chamber 36b above the pressure working housing 36d is filled with a known diaphragm driving fluid, and the diaphragm driving fluid contains a valve member driving rod located in the second passage 34 or the pressure equalizing hole 36e. The heat of the gas-phase refrigerant flowing through the second passage 34 is transmitted through the 36f and the diaphragm 36a. The diaphragm driving fluid in the upper pressure working chamber 36b is gasified in response to the transmitted heat, and the gas pressure acts on the upper surface of the diaphragm 36a. The diaphragm 36a is displaced up and down in accordance with the difference between the pressure of the diaphragm driving fluid acting on the upper surface of the diaphragm 36a and the pressure applied to the lower surface of the diaphragm 36a. The vertical displacement of the central portion of the diaphragm 36a is transmitted to the valve member 32b via the receiving member 36h and the valve member drive rod 36f, and causes the valve member 32b to approach or separate from the valve seat of the valve hole 32a. As a result, the refrigerant flow rate toward the evaporator 8 is controlled. This type of expansion valve is disclosed, for example, in Patent Document 1 below.

JP 2004-138292 A

In this type of expansion valve, the refrigerant gas in the second passage 34 that returns the refrigerant gas from the evaporator 8 to the compressor 4 side when the compressor 4 is started is sucked into the compressor 8 and a sudden pressure drop occurs. The pressure difference between the second passage 34 and the pressure working chamber 36b of the valve member driving device 36 increases, and the valve member 32b rapidly fully opens the valve hole 32a. As a result, a large number of bubbles are generated in the high-pressure refrigerant introduced into the valve chamber 35 through the first passage 32, and an unpleasant noise is generated when the bubbles burst.
The objective of this invention is providing the expansion valve which eliminates the malfunction mentioned above.

To achieve the above object, a first expansion valve according to the present invention includes an inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, and a valve hole provided in the valve chamber. A valve body having an outlet port for leading the refrigerant expanded in the valve hole to the outside and a passage through which the refrigerant returning from the evaporator to the compressor passes, a valve member for opening and closing the valve hole, and driving the valve member And a valve member driving device for controlling the opening degree of the valve hole, and provided with a throttle member fixed to the outlet port by a caulking portion formed by plastic processing of the valve body. .
The caulking portion is formed by performing a plastic working on a stepped reduced diameter portion provided in the inner portion of the outlet port.
Further, the throttle member can be a plate-like member having one through-hole in the central portion or a plate-like member having a large number of small-diameter through-holes.

The second expansion valve according to the present invention includes an inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, a valve hole provided in the valve chamber, and an expansion through the valve hole. A valve body having an outlet port for leading the refrigerant to the outside and a passage through which the refrigerant returning from the evaporator to the compressor passes, a valve member for opening and closing the valve hole, and driving the valve member to open the valve hole An expansion valve provided with a valve member driving device for controlling the degree, wherein a throttle member fixed by press-fitting to the outlet port is provided.
In this case, the throttle member is a plate-like member having a flange portion press-fitted into the outlet port and one through hole formed in the center portion, or a flange portion press-fitted into the outlet port and a large number of small diameters. It can be set as the plate-shaped member which has a through-hole.

  Since the expansion valve of the present invention is provided with the throttle member at the outlet port, the bubbles in the high-pressure refrigerant passing through the valve body are subdivided, and the generation of noise due to the bursting of the bubbles can be reduced. .

The front view and sectional drawing of the Example of this invention. Explanatory drawing of the formation method of the crimp part of FIG. The front view and sectional drawing of the aperture member of FIG. The front view and sectional drawing of the other Example of this invention. Explanatory drawing of the formation method of the crimp part of FIG. The front view and sectional drawing of the aperture member of FIG. The front view and sectional drawing of the other Example of this invention. The front view and sectional drawing of the aperture member of FIG. The front view and sectional drawing of the other Example of this invention. The front view and sectional drawing of the aperture member of FIG. Sectional drawing of a prior art.

  As shown in FIG. 1, the valve body 30 of the expansion valve of the present invention, indicated as a whole by the reference numeral 1, is provided with a pair of through holes 50 extending in parallel with the refrigerant passage. Used to attach the expansion valve to other equipment. In other structures, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the embodiment shown in FIG. 1, the disk-shaped throttle member 100 having one through-hole 110 is formed by performing plastic working on the stepped reduced diameter portion 332 at the back of the outlet port 331. It is fixed by the caulking portion 334.

2A and 2B show details of the method for fixing the throttle member. FIG. 2A is an explanatory view showing a state before plastic working, and FIGS. 2B and 2C are explanatory views showing a state after plastic working. is there.
In FIG. 2A, the disc-shaped throttle member 100 is fitted into a stepped reduced diameter portion 332 at the back of the outlet port 331. Thereafter, the stepped reduced diameter portion 332 is subjected to plastic working to form a crimped portion 334. Since the valve body 30 is made of a material with good workability such as an aluminum alloy material, this plastic working can be easily achieved.
The caulking portion 334 is so-called peel caulking, and is formed by locally plastically processing an annular wall at intervals in the circumferential direction. In the illustrated embodiment, four caulking portions 334 are formed on the circumference, and the throttle member 100 is securely fixed to the inner portion of the outlet port 331.

FIG. 3 is an explanatory view showing details of the diaphragm member 100.
The aperture member 100 is a disk-shaped member having one through hole 110 having a relatively large diameter at the center, and is made of, for example, a plate material made of an aluminum alloy material.
Although the size of the throttle member 100 is not particularly limited, as shown in FIG. 2, the diameter of the through hole 110 is d, and the inner diameter of the passage 33 through which the refrigerant immediately passes through the valve hole 32a is D. When the aperture ratio = d ² / D ² × 100 is set to about 21.4 to 79.0%, it has been found that favorable results can be obtained in terms of pressure loss and noise reduction.
The outer peripheral portion 102 of the aperture member 100 is formed as a flat surface so as to surely contact the crimping portion 334, but a tapered surface can be formed toward the central through hole 110.

4 to 6 are explanatory views showing other embodiments of the present invention.
In this embodiment, the throttle member 150 attached to the outlet port 331 has a structure in which a large number of small-diameter through holes 160 are formed in a disk-shaped main body.
The throttle member 150 is made of, for example, a plate material made of an aluminum alloy material, and is fixed to the inner portion of the outlet port 331 by the crimping portion 334 as in the above-described embodiment. Since the throttle member 150 has a large number of small-diameter through-holes 160, bubbles in the refrigerant from the expansion valve to the evaporator are efficiently subdivided, and the noise reduction effect is further improved.
The diameter and number of the small diameter through holes 160 are not particularly limited. As shown in FIG. 5, when the diameter of the small diameter through holes 160 is d ′, the number is n, and the inner diameter of the passage 33 is D, the aperture ratio is = N × d ′ ² / D ² × 100 is set to about 24.0 to 66.4%, it is known that favorable results can be obtained in terms of pressure loss and noise reduction.

FIG. 7 is an explanatory view showing another embodiment of the present invention.
In the present embodiment, the throttle member 200 is fixed to the inner part of the outlet port 331 by press-fitting.

FIG. 8 shows details of the diaphragm member. The diaphragm member 200 is manufactured by processing a plate material made of, for example, an aluminum alloy material into a disk shape, and a flange portion 202 is formed on the outer peripheral portion.
One through hole 210 having a relatively large diameter is provided at the center of the diaphragm member 200. The surface from the flange portion 202 toward the through hole 210 is formed as the tapered surface 204 in the illustrated embodiment, but may be a flat surface.
By providing the flange portion 202, the contact area with the outlet port 331 that has been press-fitted also increases, and reliable fixation is achieved.
In the present embodiment, the plastic working for forming the crimped portion can be omitted, and the number of processing steps can be reduced.

9 and 10 are explanatory views showing an embodiment of the present invention.
In the present embodiment, the throttle member 250 has a large number of small diameter through holes 260.
As shown in FIG. 10, the throttle member 250 has a flange portion 252 on the outer peripheral portion, and is securely fixed to the back of the outlet port 331 by press-fitting.

As described above, the present invention has a configuration in which the throttle member having the function of squeezing the refrigerant to the refrigerant outlet port from the expansion valve to the evaporator and rectifying the flow of the refrigerant is securely fixed by crimping or press-fitting. is there.
With this configuration, the refrigerant flowing out from the outlet port is rectified, and noise due to bubble collision is reduced. In addition, the throttle member can be manufactured at a low cost by pressing or the like, and can be easily fixed to the valve body by plastic working or press-fitting of the valve body. The noise can be effectively reduced without significantly increasing the noise.

DESCRIPTION OF SYMBOLS 1 Expansion valve 30 Valve body 32a Valve hole 32b Valve member 321 Inlet port 331 Outlet port 334 Caulking part 34 Passage 35 Valve chamber 36 Valve member drive device 100 Restriction member 110 Through hole 150 Restriction member 160 Small diameter through hole 200 Restriction member 210 Through hole 250 Diaphragm member 260 Small diameter through hole

Claims (7)

  Inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, a valve hole provided in the valve chamber, an outlet port for deriving the refrigerant expanded in the valve hole to the outside, and an evaporator An expansion valve comprising a valve body having a passage through which refrigerant returns from the compressor to the compressor, a valve member that opens and closes the valve hole, and a valve member driving device that drives the valve member to control the opening degree of the valve hole An expansion valve comprising a throttle member fixed to the outlet port at a crimped portion formed by plastic processing of the valve body.   2. The expansion valve according to claim 1, wherein the crimping portion is formed by subjecting a stepped reduced diameter portion provided in a back portion of the outlet port to plastic processing.   2. The expansion valve according to claim 1, wherein the throttle member is a plate-like member having one through hole at a central portion.   2. The expansion valve according to claim 1, wherein the throttle member is a plate-like member having a large number of small-diameter through holes.   Inlet port for introducing a high-pressure refrigerant condensed by a condenser, a valve chamber communicating with the inlet port, a valve hole provided in the valve chamber, an outlet port for deriving the refrigerant expanded in the valve hole to the outside, and an evaporator An expansion valve comprising a valve body having a passage through which refrigerant returns from the compressor to the compressor, a valve member that opens and closes the valve hole, and a valve member driving device that drives the valve member to control the opening degree of the valve hole An expansion valve comprising a throttle member fixed to the outlet port by press-fitting.   6. The expansion valve according to claim 5, wherein the throttle member is a plate-like member having a flange portion press-fitted into the outlet port and a single through hole formed in a central portion.   6. The expansion valve according to claim 5, wherein the throttle member is a plate-like member having a flange portion press-fitted into the outlet port and a large number of small-diameter through holes.

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