JP3943843B2 - Soundproof cover for expansion valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soundproof cover for an expansion valve, and in particular, an expansion valve is used to obtain a low-temperature refrigerant in a refrigeration cycle of a car air conditioner for an automobile. The present invention relates to a soundproof cover for an expansion valve.
[0002]
[Prior art]
In automotive air conditioner systems, high-temperature and high-pressure gas refrigerant compressed by a compressor is condensed by a radiator, and high-pressure liquid refrigerant is adiabatically expanded by an expansion valve to form a low-temperature and low-pressure refrigerant, which is evaporated by an evaporator and compressed by the compressor. A refrigeration cycle that returns to the above is formed. The evaporator to which the low-temperature refrigerant is supplied exchanges heat with the air in the passenger compartment and performs cooling.
[0003]
The expansion valve senses the temperature change of the refrigerant in the low-pressure refrigerant passage on the evaporator outlet side, and raises and lowers the pressure of the inside, and the flow rate of refrigerant supplied to the evaporator inlet side driven by the pressure rising and lowering of the temperature sensitive room And a valve mechanism for controlling. This valve mechanism is housed in a valve case. A high pressure refrigerant pipe is provided at the refrigerant inlet provided in the valve case, and a low pressure refrigerant pipe to the evaporator is provided at the refrigerant outlet by a fastening tool such as a nut. Connected. A temperature sensing cylinder is connected to the temperature sensing greenhouse, and the tip of the temperature sensing cylinder is closely fixed to the refrigerant pipe on the evaporator outlet side to sense the temperature of the refrigerant at the evaporator outlet.
[0004]
The original expansion valve detects not only the temperature but also the pressure of the refrigerant with respect to the refrigerant at the evaporator outlet, and controls the valve mechanism according to the fluctuation of the pressure. It is desired to reduce the cost of such an expansion valve. In response to this, as described above, an expansion valve has been developed that senses only the temperature of the refrigerant at the evaporator outlet, and eliminates the connection between the refrigerant pipe on the evaporator outlet side and the refrigerant pipe to the compressor. In this way, the cost is reduced. This is because when the refrigerant exiting the expansion valve exits through the evaporator, the pressure loss in the evaporator is almost constant, and therefore the pressure obtained by subtracting the pressure loss from the pressure at the outlet of the expansion valve. This is based on the fact that it can be regarded as the refrigerant pressure at the outlet of the evaporator.
[0005]
Further cost reduction is desired for such a conventional expansion valve, and in response to this, the applicant of the present application has previously integrated a valve case, a high-pressure refrigerant pipe connected to the valve case, a low-pressure refrigerant pipe, and an evaporator. An expansion valve that has been formed and eliminates the need for a fastening tool such as a nut for pipe connection, thereby reducing the assembly cost has been proposed (Japanese Patent Application No. 2001-22792). According to this expansion valve, one end of the valve case is opened, and a temperature-sensing greenhouse in which the inside of the low-pressure refrigerant pipe in the low-pressure refrigerant pipe on the evaporator outlet side senses a temperature change from the opening to raise and lower the pressure. And an expansion valve unit having a valve mechanism for controlling the flow rate of the refrigerant supplied to the evaporator inlet side is inserted, and for example, the valve case and the flange portion of the expansion valve unit are clipped.
[0006]
By the way, since the expansion valve squeezes and expands the introduced liquid refrigerant, the expansion valve flows out in a mixed form of the liquid and the bubble-like gas. While such refrigerant flows to the low-pressure refrigerant pipe, in the expansion valve unit, the irregular shape of the fluid passage, the members disposed in the fluid passage, and the like become obstacles to the flow, and abnormal noise is generated. Further, when the valve body driven by the pressure increase / decrease pressure of the sensation greenhouse vibrates slightly, vibration sound is generated from the valve body. Since the expansion valve is arranged in the air flow after the heat exchange with the air in the passenger compartment by the evaporator, such vibration and noise are radiated into the passenger compartment, It is a cause of impairing silence. Furthermore, in order to reduce the weight of the expansion valve, the thickness of the housing of the expansion valve itself has been reduced, and abnormal noise generated inside has become easily leaked to the outside. Conventionally, when such abnormal noise or vibration is large, for example, a soundproofing measure has been taken by covering the expansion valve with a highly adhesive rubber tape.
[0007]
[Problems to be solved by the invention]
However, in the case of the conventional expansion valve, if the occurrence of vibration or abnormal noise is large, after the expansion valve is attached, some kind of soundproofing measures must be taken for the expansion valve, resulting in high parts and assembly costs. There was a problem of becoming.
[0008]
The present invention has been made in view of these points, and an object thereof is to provide a soundproof cover for an expansion valve that can obtain a soundproofing effect without cost.
[0009]
[Means for Solving the Problems]
In the present invention, in order to solve the above problems, an expansion valve attached to an expansion valve having a structure in which an expansion valve unit having a minimum function as an expansion valve is attached to a valve case formed integrally with a high-pressure refrigerant pipe and a low-pressure refrigerant pipe. This is a soundproof cover for two parts, which is constituted by two half shells that can be coupled to each other, and each half shell is formed in accordance with the gripping part that sandwiches and fixes the expansion valve unit and the valve case and the outer shape of the valve case by having a body, said valve casing and soundproof cover for an expansion valve, characterized in that holds the mounted state to the valve casing of the expansion valve unit while not covering the expansion valve unit is provided The
[0010]
According to such a soundproof cover for an expansion valve, by attaching the expansion valve unit to a valve case formed integrally with the high-pressure refrigerant pipe and the low-pressure refrigerant pipe, the holding means such as a clip is provided. Without being necessary, the mounting state of the expansion valve unit to the valve case can be maintained, and vibration noise generated inside the expansion valve or noise due to the refrigerant flow can be suppressed. Thereby, cost can be reduced compared with the case where a soundproofing measure is taken alone.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an expansion valve showing a state where an expansion valve soundproof cover according to a first embodiment of the present invention is attached.
[0012]
The expansion valve to which the expansion valve soundproof cover 1 according to the present invention is attached includes an expansion valve unit 2 having a minimum function as an expansion valve, a valve case 3 for housing the expansion valve unit 2, and welded to the valve case 3. The high-pressure refrigerant pipe 4 and the low-pressure refrigerant pipe 5 formed integrally with the valve case 3 are configured. The expansion valve soundproof cover 1 has a function of fixing the expansion valve unit 2 and the valve case 3 to which the expansion valve unit 2 is mounted, and a function of covering the expansion valve unit 2 and the valve case 3 and isolating vibrations and noise generated from the inside. And have. The low-pressure refrigerant pipe 5 is connected to a compressor that compresses the refrigerant through an evaporator that exchanges heat with the air in the passenger compartment. The compressor includes a condenser that exchanges heat with the air outside the passenger compartment, and a part of the condenser. The condensed refrigerant is connected to the high-pressure refrigerant pipe 4 via a receiver that gas-liquid separates and sends out only the liquid refrigerant.
[0013]
The expansion valve unit 2 includes a temperature sensing cylinder 11 that detects the temperature of the refrigerant flowing through the outlet pipe of the evaporator, a temperature sensing greenhouse 12 in which the internal pressure is increased and decreased by temperature detection by the temperature sensing cylinder 11, and the elevation of the temperature sensing greenhouse 12 A valve mechanism that is driven by pressure to open and close the high-pressure refrigerant passage is integrally formed.
[0014]
The temperature sensitive greenhouse 12 is formed by a thick metal plate housing 13 and a flexible metal thin plate diaphragm 14, and the outer peripheral ends thereof are caulked by a temperature sensitive greenhouse mounting seat 15 and then welded to the room. Has become airtight. Inside, a gas having the same or similar properties as the refrigerant that is the working fluid of the refrigeration cycle is enclosed in a saturated vapor state. A temperature sensing cylinder 11 made of a capillary tube is brazed to the top of the housing 13.
[0015]
The lower end portion of the greenhouse-sensitive seat 15 is screwed into the upper portion of the valve mechanism body 16. The body 16 has a high-pressure refrigerant passage 17 drilled from the side toward the center at a substantially central portion in the longitudinal direction, and a low-pressure refrigerant passage 18 drilled in the axial direction at the lower tip. is doing. A hole for communicating between the high-pressure refrigerant passage 17 and the low-pressure refrigerant passage 18 is provided at the axial position of the body 16, and the valve seat 19 is provided on the low-pressure refrigerant passage 18 side. A spherical valve body 20 is disposed opposite to the valve seat 19, and the valve body 20 is urged toward the valve seat 19 via a valve body receiver 22 by a compression coil spring 21. A proximal end portion of the compression coil spring 21 is received by an adjustment screw 23. The adjusting screw 23 is screwed to the inner wall surface of the low-pressure refrigerant passage 18, and the urging force against the valve body 20 can be adjusted by rotating the adjusting screw 23.
[0016]
A shaft 24 is inserted into the axial position of the body 16 so as to be movable back and forth in the axial direction, one end of which is in contact with or welded to the valve body 20, and the other end is in contact with the lower surface of the diaphragm 14 via a disk 25. Has been. The shaft 24 is positioned at the axial position of the body 16 by the holder 26.
[0017]
The body 16 is provided with a communication passage 27 that equalizes the space below the diaphragm 14 of the temperature sensitive greenhouse 12 with the low-pressure refrigerant passage 18. The space below the diaphragm 14 is sealed from the high-pressure refrigerant passage 17 by an O-ring 28 provided on the shaft 24. O-rings 29 and 30 are mounted on the outer periphery of the body 16 so as to sandwich the high-pressure refrigerant passage 17 therebetween, and when the expansion valve unit 2 is attached to the valve case 3, the high-pressure refrigerant passage 17 and the temperature-sensitive greenhouse 12 and It is used to seal between the low-pressure refrigerant passage 18. An O-ring 31 that seals that the space on the lower surface of the diaphragm 14 communicates with the atmosphere via a screw portion for screwing the body 16 on the outer periphery of the lower end of the greenhouse-sensing seat 15 and the O-ring 31 And a backup ring 32 for restricting the movement thereof.
[0018]
In the expansion valve unit 2 configured as described above, when the refrigerant from the receiver is supplied to the high-pressure refrigerant pipe 4, the refrigerant enters the high-pressure refrigerant passage 17 and forms a gap formed by the valve seat 19 and the valve body 20. By passing, it is adiabatically expanded and sent from the low-pressure refrigerant passage 18 to the evaporator via the low-pressure refrigerant pipe 5. The refrigerant output from the evaporator is sent to the compressor, and the outlet temperature of the refrigerant at that time is detected by the temperature sensing cylinder 11.
[0019]
In accordance with the temperature, the pressure of the gas enclosed in the sensation greenhouse 12 changes, and the pressure in the sensation greenhouse 12 rises and falls. On the other hand, the refrigerant in the low-pressure refrigerant passage 18 passes through the communication passage 27 and enters the back side of the sensitive greenhouse 12, and the back side of the diaphragm 14 receives the refrigerant pressure in the low-pressure refrigerant passage 18. The diaphragm 14, the shaft 24 and the valve body 20 are stationary at a position where the refrigerant pressure, the pressure in the sensation greenhouse 12 and the urging force of the compression coil spring 21 are balanced, and the amount of refrigerant sent from the high-pressure refrigerant pipe 4 to the evaporator is determined. It is done. Here, when the outlet temperature of the refrigerant discharged from the evaporator increases, the pressure in the temperature sensing chamber 12 increases, the surface of the diaphragm 14 is displaced downward, and the displacement pushes down the valve body 20 via the shaft 24, Control is performed to increase the opening degree to increase the flow rate of the refrigerant and to lower the outlet temperature of the refrigerant exiting the evaporator. When the outlet temperature of the refrigerant exiting the evaporator is low, the reverse operation is performed to increase the outlet temperature of the refrigerant exiting the evaporator.
[0020]
Here, the expansion valve unit 2 and the valve case 3 to which the expansion valve unit 2 is mounted are fixed, and the soundproofing for the expansion valve covering the expansion valve unit 2 and the valve case 3 so as to isolate the vibration and noise generated from the inside. The cover 1 will be described.
[0021]
2 is a side view showing a half shell part constituting the soundproof cover for the expansion valve, FIG. 3 is a cross-sectional view taken along the line aa of FIG. 2 showing the coupling part of the half shell part, and FIG. It is a side view of the expansion valve which shows an attachment state.
[0022]
The expansion valve soundproof cover 1 is composed of two semi-cylindrical half shell portions 41a and 41b. These half shell parts 41a and 41b are each shape | molded with the metal. Since each half shell part 41a, 41b has the same shape, respectively, one half shell part 41a is explained.
[0023]
The half shell portion 41 a includes a holding portion 42 a that sandwiches and fixes the outer peripheral ends of the expansion valve unit 2 and the valve case 3 from above and below, a body 43 a that is formed according to the outer shape of the valve case 3, and one of the body 43 a And a locking portion 46a having an opening 45a projecting from the other side edge of the body 43a and into which the projection 44b of the other half shell portion 41b is inserted. Are integrated.
[0024]
A semicircular cutout portion 47a for passing the top of the housing 13 of the temperature sensitive greenhouse 12 and the temperature sensing cylinder 11 is formed on the upper portion of the holding portion 42a of the half shell portion 41a, and is formed on one side edge of the body 43a. Is formed with a semicircular cutout portion 48a for passing the high-pressure refrigerant pipe 4, and a semicircular cutout portion 49a for passing the low-pressure refrigerant pipe 5 is formed at the lower portion of the body 43a.
[0025]
When the half shell portions 41a and 41b having such a shape are attached so as to sandwich the expansion valve unit 2 and the valve case 3 to which the expansion valve unit 2 is attached, for example, when viewed from the high-pressure refrigerant pipe 4 side as shown in FIG. The protrusions 44b of the half shell portion 41b fit into the openings 45a opened in the locking portions 46a of the half shell portion 41a and are coupled to each other. At this time, the half shell portions 41a and 41b serve as clips for fixing the expansion valve unit 2 and the valve case 3 at the same time by the holding portions 42a and 42b.
[0026]
Accordingly, the expansion valve is covered with the expansion valve soundproof cover 1 including the half shell portions 41a and 41b, so that the vibration sound of the valve body 20 generated inside the expansion valve and the abnormal sound when the gas-liquid refrigerant flows. Can be shielded by the expansion valve soundproof cover 1.
[0027]
FIG. 5 is a longitudinal sectional view showing a half shell part of a soundproof cover for an expansion valve according to a second embodiment of the present invention.
According to the second embodiment, the half shell portion 51 constituting the expansion valve soundproof cover 1 is a metal plate having a laminated structure in which a sheet-shaped damping material 54 is sandwiched between two metal plates 52 and 53. For example, it is formed of a damping steel plate. In the illustrated example, the metal plate has a laminated structure in which the damping material 54 is sandwiched between the two metal plates 52 and 53. However, the sheet-like damping material is attached to the back surface of the half shell portion 51. Alternatively, a two-layer structure adhered to the surface or a multilayer structure of a vibration damping material and a metal plate may be used. The shape to be molded is the same as that of the first embodiment.
[0028]
Thereby, compared with the half shell parts 41a and 41b in the case of 1st Embodiment which shape | molded and comprised the metal plate of 1 sheet, a damping effect and a sound-insulation effect can be made high.
[0029]
FIG. 6 is a longitudinal sectional view of the expansion valve showing a state in which the expansion valve soundproof cover according to the third embodiment of the present invention is attached. In this figure, the expansion valve to which the expansion valve soundproof cover is attached is the same as that shown in FIG.
[0030]
The expansion valve soundproof cover 61 according to the third embodiment has a metal outer side and a vibration damping member 62 on the inner side. The vibration damping member 62 is formed by molding a material having a vibration damping and soundproofing effect such as lead, rubber, butyl rubber resin, and a sound absorbing material.
[0031]
FIG. 7 is a side view showing a first half shell portion constituting the expansion valve soundproof cover, FIG. 8 is a side view showing a second half shell portion constituting the expansion valve soundproof cover, and FIG. 7 is a cross-sectional view taken along the line bb in FIG. 7 showing the half shell part, FIG. 10 is a cross-sectional view taken along the line cc in FIG. 8 showing the second half shell part, and FIG. It is a side view of the expansion valve shown.
[0032]
The expansion valve soundproof cover 61 includes semicylindrical first and second half shell portions 63 and 64. Each of the first and second half shell portions 63 and 64 is made by metal press molding, and a damping member 62 is provided inside thereof.
[0033]
In the first and second half shell portions 63, 64, the top portions 65, 66 and the bottom portions 67, 68 serve as clips that hold the state where the expansion valve unit 2 is mounted on the valve case 3.
[0034]
The first half shell portion 63 is integrally formed with two projecting portions 69 projecting from one side edge portion thereof and two projecting portions 70 projecting from the other side edge portion. . Openings 71 are respectively formed in the protrusions 70.
[0035]
The second half shell portion 64 is integrally formed with two projecting portions 72 projecting from one side edge portion thereof and two engaging portions 73 projecting from the other side edge portion. Has been. The projecting portion 72 is inserted into the opening 71 of the projecting portion 70 projecting from the first half shell portion 63 during assembly, and is used to fix one side edge portion. Each part 73 has an opening 74 formed therein, and when assembled, as shown in FIG. 11, the protrusion 69 projecting from the first half shell part 63 fits into the opening 74, Combined with each other.
[0036]
FIG. 12 is a plan view for explaining the assembly procedure of the first and second half shell portions, where (A) shows the first assembly step, (B) shows the second assembly step, and (C) shows A 3rd assembly process is shown and (D) has shown the 4th assembly process.
[0037]
First, in a 1st assembly process, in the state which mounted | wore with the expansion valve unit 2 to the valve case 3, they are covered with the 1st half shell part 63 from a side surface. In the second assembling step, the protrusion 72 protruding from the second half shell portion 64 is inserted into the opening 71 of the protrusion 70 protruding from the first half shell portion 63.
[0038]
In the third assembly step, the second half shell portion 64 is tilted toward the expansion valve unit 2 with the insertion position of the protrusion 72 into the opening 71 as a fulcrum. Accordingly, when the second half shell portion 64 tilts while wrapping the expansion valve unit 2 and the valve case 3, the locking portion 73 of the second half shell portion 64 is the first half in the fourth assembly step. When the second half shell portion 64 is pushed in, the locking portion 73 gets over the protruding portion 69, and the protruding portion 69 becomes the locking portion. The first half shell portion 63 and the second half shell portion 64 are coupled to each other, and the assembly is completed.
[0039]
Thereby, since the outside of the expansion valve is covered by the expansion valve soundproof cover 61 including the first and second half shell portions 63 and 64, the vibration sound of the valve body generated inside the expansion valve and the gas-liquid refrigerant are generated. Abnormal sound emission when flowing can be shielded by the expansion valve soundproof cover 61.
[0040]
【The invention's effect】
As described above, in the present invention, an expansion valve having a structure in which an expansion valve unit having a minimum function as an expansion valve is mounted on a valve case formed integrally with a high-pressure refrigerant pipe and a low-pressure refrigerant pipe is covered with these. In addition, the valve case and the expansion valve unit are fixed. As a result, the soundproof cover for the expansion valve itself has a function of fixing the valve case and the expansion valve unit, so a fixing means such as a clip becomes unnecessary, and a new component for soundproofing and vibration suppression There is provided an expansion valve that can effectively prevent vibration and noise caused by the passage of refrigerant at a lower cost than the case of preparation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an expansion valve showing a state in which a soundproof cover for an expansion valve according to a first embodiment of the present invention is attached.
FIG. 2 is a side view showing a half shell portion constituting a soundproof cover for an expansion valve.
3 is a cross-sectional view taken along the line aa of FIG. 2 showing a coupling portion of the half shell portion.
FIG. 4 is a side view of the expansion valve showing a state in which the expansion valve soundproof cover is attached.
FIG. 5 is a longitudinal sectional view showing a half shell part of a soundproof cover for an expansion valve according to a second embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of an expansion valve showing a state in which an expansion valve soundproof cover according to a third embodiment of the present invention is attached.
FIG. 7 is a side view showing a first half shell part constituting the soundproof cover for the expansion valve.
FIG. 8 is a side view showing a second half shell part constituting the soundproof cover for the expansion valve.
9 is a cross-sectional view taken along the line bb in FIG. 7 showing the first half shell portion.
10 is a cross-sectional view taken along the line cc of FIG. 8 showing a second half shell portion.
FIG. 11 is a side view of the expansion valve showing a state where the expansion valve soundproof cover is attached.
FIGS. 12A and 12B are plan views for explaining an assembly procedure of the first and second half shell portions, wherein FIG. 12A shows a first assembly process, FIG. 12B shows a second assembly process, and FIG. Shows the third assembly step, and (D) shows the fourth assembly step.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Soundproof cover for expansion valves 2 Expansion valve unit 3 Valve case 4 High pressure refrigerant piping 5 Low pressure refrigerant piping 41a, 41b Half shell part 42a, 42b Gripping part 43a Body 44a, 44b Protrusion part 45a Opening part 46a Locking part 47a, 48a, 49a Notch 51 Half shell 52, 53 Metal plate 54 Damping material 61 Soundproof cover for expansion valve 62 Damping member 63, 64 Half shell 65, 66 Top 67, 68 Bottom 69 Projection 70 Projection 71 Opening 72 Protruding part 73 Locking part 74 Opening part

Claims (3)

A soundproof cover for an expansion valve attached to an expansion valve having a structure in which an expansion valve unit having a minimum function as an expansion valve is attached to a valve case formed integrally with a high-pressure refrigerant pipe and a low-pressure refrigerant pipe,
It comprises two half shells that can be coupled to each other, and each half shell has a holding part that sandwiches and fixes the expansion valve unit and the valve case, and a body that is formed in accordance with the outer shape of the valve case , soundproof cover expansion valve, characterized by holding the attached state to the valve casing of the expansion valve unit while not covering the valve case and the expansion valve unit. 2. The soundproof cover for an expansion valve according to claim 1, wherein the half shell is formed by press-molding a plate having a laminated structure of a metal plate and a sheet-like damping material. 2. The soundproof cover for an expansion valve according to claim 1, wherein a damping member is disposed inside each of the half shells.

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