US20050150109A1 - Method of processing valve mechanism - Google Patents
Method of processing valve mechanism Download PDFInfo
- Publication number
- US20050150109A1 US20050150109A1 US11/032,283 US3228305A US2005150109A1 US 20050150109 A1 US20050150109 A1 US 20050150109A1 US 3228305 A US3228305 A US 3228305A US 2005150109 A1 US2005150109 A1 US 2005150109A1
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- US
- United States
- Prior art keywords
- valve
- valve body
- processing
- valve seat
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0406—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of balls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49409—Valve seat forming
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49405—Valve or choke making
- Y10T29/49426—Valve or choke making including metal shaping and diverse operation
Definitions
- the present invention relates to a valve mechanism formed by a differential pressure regulating valve, for example, for use in a refrigerating circuit for an air conditioner.
- the refrigerating circuit for the air conditioner has used at various portions thereof valve mechanisms formed by the differential pressure regulating valves in order to adjust various pressures in the refrigerating circuit.
- a valve mechanism disclosed in Japanese Unexamined Patent Publication No. 11-324909 relieves the pressure in a crank chamber of a refrigerant compressor which forms a refrigerating circuit to a low-pressure region in the refrigerating circuit when the pressure becomes extraordinarily high.
- the valve mechanism includes a spherical valve body, a valve hole in communication with the crank chamber, a valve seat formed by the opening of the valve hole, and a spring which urges the valve body toward the valve seat.
- a spherical valve body When the pressure in the crank chamber becomes extraordinarily high, force applied to the valve body in a valve opening direction increases in accordance with the pressure in the valve hole. Therefore, the valve body is separated from the valve seat so as to resist the urging force of the spring, thereby relieving the pressure in the crank chamber to a low-pressure region through the valve hole and an opening between the valve body and the valve seat.
- valve mechanism for use in the refrigerating circuit, in addition to the valve mechanism which prevents the pressure in the crank chamber of the aforementioned refrigerant compressor from becoming extraordinarily high, a valve mechanism (a relief valve) which relieves extraordinarily high pressure of a high-pressure region in a refrigerating circuit to the atmosphere is mentioned.
- the valve mechanism which is used as a relief valve may have a structure similar to the valve mechanism, which prevents the pressure in the crank chamber of the refrigerant compressor from becoming extraordinarily high.
- valve mechanism is formed so that the valve body is urged toward the valve seat by the urging force of the spring. Therefore, under the circumstances where the differential pressure is not applied to the valve body, for example, when the valve mechanism is assembled, the valve body is urged against the valve seat with relatively large force by the urging force of the spring.
- the spherical valve body is in contact with the valve seat in a sort of angled state. Therefore, the valve body is pushed against the valve seat with relatively large force, thereby plastically deforming the valve seat along the form of a part of the outer surface (the spherical surface) of the valve body.
- valve mechanism When the valve mechanism is assembled, no attention is paid to it that the valve body which is directly held, is contacted with the valve seat in a suitable position. Therefore, a contacting position of the valve body with the valve seat may deviate from the suitable position.
- the valve body When the valve body is pushed against the valve seat in the state of being deviated from the suitable position and the valve seat is plastically deformed, accordingly, the valve hole cannot be securely shut off by the valve body which is stabilized in such a state that the valve body contacts the valve seat along the form of the plastic deformation.
- the valve mechanism which is used as the relief valve, requires the spring which pushes the valve body against the valve seat so as to resist relatively large pressure differential between the high-pressure region in the refrigerating circuit and the atmosphere. That is, the spring requires relatively large urging force, for example, compared to the valve mechanism, which prevents the pressure in the crank chamber of the refrigerant compressor from becoming extraordinarily high. Therefore, when the relief valve is assembled, the valve body is pushed against the valve seat with further large force by relatively large urging force of the spring, thereby easily plastically deforming the valve seat.
- the present invention is directed to a method of processing a valve mechanism in which a valve body in contact with a valve seat securely closes a valve hole.
- the present invention produces a method of processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, a valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat.
- the valve mechanism is so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat.
- the method includes the steps of: preparing a processing tool having a processing surface in the form of a convex spherical surface which has the same curvature radius as the shut-off surface of the valve body; positioning the processing tool to the valve seat; and forming the valve seat along the form of the processing surface by pushing the processing surface of the processing tool against the valve seat.
- the present invention also produces a tool for processing a valve seat being used upon processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, the valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat.
- the valve mechanism is so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat.
- the processing tool includes a processing surface in the form of a convex spherical surface having the same curvature radius as the shut-off surface of the valve body.
- FIG. 1 is a longitudinal sectional view showing a relief valve
- FIG. 2 is a diagram illustrating a process for producing the relief valve
- FIG. 3 is a diagram illustrating a process for producing another relief valve.
- a method of processing a valve mechanism according to a preferred embodiment of the present invention will now be described below.
- the present preferred embodiment is embodied in a method of processing a relief valve for use in a refrigerating circuit of an air conditioner functioning as a fluid circuit.
- a refrigerating circuit 51 includes a refrigerant compressor 52 , a gas cooler 53 , an expansion valve 54 and an evaporator 55 .
- the refrigerant compressor 52 also includes a suction chamber 52 a , a compression chamber 52 b , a discharge chamber 52 c and a compressor housing 52 d .
- the refrigerant compressor 52 introduces a refrigerant gas from the suction chamber 52 a into the compression chamber 52 b , compresses the introduced refrigerant gas therein, and discharges the compressed refrigerant gas into the discharge chamber 52 c .
- the gas cooler 53 cools down the refrigerant gas of high pressure from the discharge chamber 52 c of the refrigerant compressor 52 .
- the expansion valve 54 throttles the refrigerant gas from the gas cooler 53 .
- the evaporator 55 evaporates the refrigerant gas from the expansion valve 54 .
- a carbon dioxide is used as the refrigerant gas in the refrigerating circuit 51 .
- the refrigerant compressor 52 is equipped with a relief valve 10 .
- the relief valve 10 has a valve housing 11 which forms a configuration thereof.
- the valve housing 11 includes a first body 12 and a second body 13 .
- the first body 12 is screwed into the compressor housing 52 d of the refrigerant compressor 52 .
- the second body 13 is screwed onto the first body 12 while arranged outside the compressor housing 52 d .
- the first body 12 has a partitioning portion 14 which is screwed into the second body 13 .
- the partitioning portion 14 of the first body 12 and the second body 13 define a valve chamber 15 .
- the partitioning portion 14 separates the valve chamber 15 from the discharge chamber 52 c which is defined in the compressor housing 52 d of the refrigerant compressor 52 .
- the partitioning portion 14 has an end face 14 a which faces the valve chamber 15 .
- the end face 14 a has a flat shape.
- the first body 12 has formed therethrough a communication hole 16 which extends in a direction perpendicular to the end face 14 a of the partitioning portion 14 .
- the communication hole 16 interconnects the valve chamber 15 and the discharge chamber 52 c .
- the discharge chamber 52 c is regarded as a high-pressure region in the refrigerating circuit 51 .
- the second body 13 has a circular wall which surrounds the valve chamber 15 , and the circular wall has formed a plurality of ports 13 a which radially extends therethrough.
- the valve chamber 15 is opened to the atmosphere through the ports 13 a . That is, the discharge chamber 52 c of the refrigerant compressor 52 and the atmosphere are in communication via the communication hole 16 , the valve chamber 15 and the ports 13 a.
- the valve chamber 15 has accommodated therein a valve body 18 which is formed by a spherical body made of steel.
- the valve body 18 is movable with respect to the end face 14 of the partitioning portion 14 in a direction in which the valve body 18 is contacted with or separated from the partitioning portion 14 .
- the valve chamber 15 also has accommodated therein a spring seat 19 , which is movable in the valve chamber 15 .
- the spring seat 19 has a seating face 19 a in the form of a conical hollow surface on the side of the end face 14 a of the partitioning portion 14 .
- the seating face 19 a of the seat spring 19 is contacted with the valve body 18 .
- the valve chamber 15 further has accommodated therein a spring 21 made of a coil spring.
- the spring seat 19 is located on the opposite side to the partitioning portion 14 in the valve chamber 15 and supported through the spring 21 by the second body 13 .
- the spring 21 urges the valve body 18 toward the end face 14 a of the partitioning
- the end of the communication hole 16 located on the side of the valve chamber 15 is opened on the end face 14 a of the partitioning portion 14 .
- a part of the outer surface (spherical surface) of the valve body 18 in other words, a shut-off surface 18 a in the form of a convex spherical surface is contacted with the opening of the communication hole 16 in a circular region, thereby shutting off the communication between the communication hole 16 and the valve chamber 15 .
- the communication hole 16 forms a valve hole
- the opening of the communication hole 16 which is formed on the end face 14 a of the partitioning portion 14 , forms a valve seat 24 .
- the valve seat 24 is plated with a material such as tin, thereby relaxing a plastic deformation caused by the contact with the valve body 18 . Consequently, a sealing performance between the valve seat 24 and the valve body 18 is improved.
- the force applied to the valve body 18 in a valve opening direction becomes small in accordance with the pressure in the communication hole 16 .
- the valve body 18 since the urging force of the spring 21 roughly controls the position of the valve body 18 , the valve body 18 is in contact with the valve seat 24 . Therefore, the valve body 18 shuts off the communication between the communication hole 16 and the valve chamber 15 , thereby preventing the refrigerant gas in the discharge chamber 52 c from being released into the atmosphere.
- the pressure in the discharge chamber 52 c at the time when the valve body 18 starts to be separate from the valve seat 24 is set by adjusting the thickness of a shim 26 interposed between the first body 12 and the second body 13 . That is, by adjusting the thickness of the shim 26 , not only a screwing amount of the first body 12 (the partitioning portion 14 ) to the second body 13 but also the strength of the urging force of the spring 21 , which is applied to the valve body 18 in contact with the valve seat 24 , is adjusted.
- FIG. 2 the first body 12 , where the second body 13 of FIG. 1 has not been screwed, is shown.
- a processing tool 31 which includes the valve body 18 and a tool 32 for holding the valve body 18 is prepared.
- the processing tool 31 is positioned to the valve seat 24 so that a center point S of the valve body 18 locates on a central axis L of the communication hole 16 including the center of the valve seat 24 .
- the processing tool 31 and the valve seat 24 are relatively moved by an operation of a processing machine (not shown) in a direction in which the processing tool 31 and the valve seat 24 approach each other. Therefore, the shut-off valve 18 a of the valve body 18 which the holding tool 32 holds, that is, a processing surface in the form of a convex spherical surface provided with the processing tool 31 , which has the same curvature radius as the shut-off surface 18 a of the valve body 18 , is pushed against the valve seat 24 .
- the force of the processing machine that pushes the valve body 18 against the valve seat 24 through the holding tool 32 is set so as to have the value more than that of the spring 21 that pushes the valve body 18 against the valve seat 24 through the spring seat 19 , for example, under the circumstances where the pressure differential between the pressure in the discharge chamber 52 c and the atmosphere is not applied to the valve body 18 .
- the shape of the valve seat 24 is formed or plastically deformed from a circular line (whose cross sectional view is shown by chain double-dashed line in an enlarged circle A of FIG. 2 ) to a three-dimensional shape along a part of the shut-off surface 18 a of the valve body 18 .
- valve seat 24 is plated is performed after the above-mentioned process in which the valve seat 24 is formed by the processing tool 31 .
- This processing order prevents the plating not only from hindering the formation of the valve seat 24 by the processing tool 31 but also from being damaged by the pushing force of the processing tool 31 .
- valve seat 24 is previously plastically deformed into its suitable state by the processing tool 31 so as not to be plastically deformed in a state that a contacting position of the valve body 18 with the valve seat 24 is deviated from the suitable position. Therefore, the communication hole 16 of the relief valve 10 is securely blocked by the valve body 18 which contacts the valve seat 24 along the form of the plastic deformation, thereby preventing the refrigerant gas from leaking from the discharge chamber 52 c to the atmosphere in a state that the pressure in the discharge chamber 52 c is not extraordinarily high, and improving the performance of the refrigerating circuit 51 , accordingly.
- valve body 18 is used for the processing tool 31 .
- the formation is suitably performed.
- the relief valve 10 In order to push the valve body 18 against the valve seat 24 so as to resist a relatively large pressure differential between the inside and the outside of the refrigerating circuit 51 , the relief valve 10 requires the spring 21 whose urging force is relatively large.
- the valve seat 24 was easily plastically deformed into its unsuitable state by pushing the valve body 18 against the valve seat 24 with a relatively large force.
- the present embodiment of the present invention is particularly effective to be embodied in the method of processing the relief valve 10 .
- a high-pressure region (discharge chamber 52 c ) in the refrigerating circuit 51 becomes extraordinarily high pressure, for example, in comparison with a case where a chlorofluorocarbon is used as the refrigerant in the refrigerating circuit 51 , a spring 21 whose urging force is further large is needed. Therefore, in the prior art, the valve body 18 was pushed against the valve seat 24 further strongly and the valve seat 24 was easily plastically deformed into its unsuitable state, accordingly. That is, the present invention is particularly effective to be embodied in a method of processing the relief valve 10 provided in the refrigerating circuit 51 which uses carbon dioxide.
- a member that is different from the valve body 18 may be used as a processing tool 41 for forming the valve seat 24 .
- the processing tool 41 of FIG. 3 has a rod-like shape and has on the end of the rod-like shape a processing surface 41 a which forms a hemispherical surface functioning as a convex spherical surface.
- the processing surface 41 a of the processing tool 41 has the same curvature radius as the shut-off surface 18 a of the valve body 18 .
- the processing tool 41 is pushed against the valve seat 24 through the processing surface 41 a , thereby forming the valve seat 24 .
- the different member from the valve body 18 is used as the processing tool 41 . That is, the different member from the valve body 18 is used exclusively as the processing surface 41 a of the processing tool 41 .
- the processing tool 41 With the exclusive processing surface 41 a , the valve seat 24 is efficiently formed. This technique is suitable for the mass production of the relief valve 10 . Such an effect is accomplished even by modifying the above-preferred embodiment so as to replace the valve body 18 of the processing tool 31 by a spherical body used exclusively for forming.
- the relief valve 10 has used the spherical body (a ball valve) as the valve body 18 .
- the valve body 18 of the relief valve 10 is not limited to the spherical body if it has the shut-off surface in the form of convex spherical surface.
- a hemispherical body may be used as the valve body 18 . That is, the processing method according to the present invention may be adapted for the valve mechanism using the valve body other than the valve body in the form of spherical body.
- the relief valve 10 has used the coil spring as the spring 21 .
- the spring 21 of the relief valve 10 is not limited to the coil spring.
- a leaf spring may be used as the spring 21 . That is, the processing method according to the present invention may be adapted for the valve mechanism using the spring other than the coil spring.
- the present invention is embodied in the method of processing the relief valve 10 .
- the present invention is embodied in a method of processing a valve mechanism which relieves the pressure in a crank chamber of the refrigerant compressor 52 to a low-pressure region in the refrigerating circuit 51 when the pressure becomes extraordinarily high.
- the present invention is not limited to be embodied in a method of processing a valve mechanism provided with a refrigerating circuit which uses a carbon dioxide as a refrigerant, but may be embodied in a method of processing a valve mechanism provided with a refrigerating circuit which uses a chlorofluorocarbon as the refrigerant.
- the present invention is not limited to be embodied in the method of processing the valve mechanism provided with the refrigerating circuit, but may be embodied in a method of processing a valve mechanism provided with an air circuit or a hydraulic circuit.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
- Check Valves (AREA)
Abstract
A method of processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole, a valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat, wherein the valve mechanism is so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat, includes the steps of: preparing a processing tool having a processing surface in the form of a convex spherical surface which has the same curvature radius as the shut-off surface of the valve body; positioning the processing tool to the valve seat; and forming the valve seat along the form of the processing surface by pushing the processing surface of the processing tool against the valve seat.
Description
- The present invention relates to a valve mechanism formed by a differential pressure regulating valve, for example, for use in a refrigerating circuit for an air conditioner.
- The refrigerating circuit for the air conditioner has used at various portions thereof valve mechanisms formed by the differential pressure regulating valves in order to adjust various pressures in the refrigerating circuit. A valve mechanism disclosed in Japanese Unexamined Patent Publication No. 11-324909 relieves the pressure in a crank chamber of a refrigerant compressor which forms a refrigerating circuit to a low-pressure region in the refrigerating circuit when the pressure becomes extraordinarily high.
- Specifically, the valve mechanism includes a spherical valve body, a valve hole in communication with the crank chamber, a valve seat formed by the opening of the valve hole, and a spring which urges the valve body toward the valve seat. When the pressure in the crank chamber becomes extraordinarily high, force applied to the valve body in a valve opening direction increases in accordance with the pressure in the valve hole. Therefore, the valve body is separated from the valve seat so as to resist the urging force of the spring, thereby relieving the pressure in the crank chamber to a low-pressure region through the valve hole and an opening between the valve body and the valve seat.
- As a valve mechanism for use in the refrigerating circuit, in addition to the valve mechanism which prevents the pressure in the crank chamber of the aforementioned refrigerant compressor from becoming extraordinarily high, a valve mechanism (a relief valve) which relieves extraordinarily high pressure of a high-pressure region in a refrigerating circuit to the atmosphere is mentioned. The valve mechanism which is used as a relief valve may have a structure similar to the valve mechanism, which prevents the pressure in the crank chamber of the refrigerant compressor from becoming extraordinarily high.
- However, the valve mechanism is formed so that the valve body is urged toward the valve seat by the urging force of the spring. Therefore, under the circumstances where the differential pressure is not applied to the valve body, for example, when the valve mechanism is assembled, the valve body is urged against the valve seat with relatively large force by the urging force of the spring. In addition, the spherical valve body is in contact with the valve seat in a sort of angled state. Therefore, the valve body is pushed against the valve seat with relatively large force, thereby plastically deforming the valve seat along the form of a part of the outer surface (the spherical surface) of the valve body.
- When the valve mechanism is assembled, no attention is paid to it that the valve body which is directly held, is contacted with the valve seat in a suitable position. Therefore, a contacting position of the valve body with the valve seat may deviate from the suitable position. When the valve body is pushed against the valve seat in the state of being deviated from the suitable position and the valve seat is plastically deformed, accordingly, the valve hole cannot be securely shut off by the valve body which is stabilized in such a state that the valve body contacts the valve seat along the form of the plastic deformation. Therefore, even if the pressure in the valve hole is not extraordinarily high, there is a problem that a refrigerant gas leaks from the valve hole to a valve chamber through the opening between valve body and the valve seat, thereby causing deterioration of the performance of the refrigerating circuit.
- In particular, the valve mechanism, which is used as the relief valve, requires the spring which pushes the valve body against the valve seat so as to resist relatively large pressure differential between the high-pressure region in the refrigerating circuit and the atmosphere. That is, the spring requires relatively large urging force, for example, compared to the valve mechanism, which prevents the pressure in the crank chamber of the refrigerant compressor from becoming extraordinarily high. Therefore, when the relief valve is assembled, the valve body is pushed against the valve seat with further large force by relatively large urging force of the spring, thereby easily plastically deforming the valve seat.
- This problem gets further serious in a case where the refrigerating circuit uses a carbon dioxide as a refrigerant, for in a case where the carbon dioxide is used as the refrigerant the high-pressure region in the refrigerating circuit becomes further high pressure in comparison with a case that a chlorofluorocarbon is used as the refrigerant, thereby requiring the spring which has further large urging force.
- The present invention is directed to a method of processing a valve mechanism in which a valve body in contact with a valve seat securely closes a valve hole.
- The present invention produces a method of processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, a valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat. The valve mechanism is so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat. The method includes the steps of: preparing a processing tool having a processing surface in the form of a convex spherical surface which has the same curvature radius as the shut-off surface of the valve body; positioning the processing tool to the valve seat; and forming the valve seat along the form of the processing surface by pushing the processing surface of the processing tool against the valve seat.
- The present invention also produces a tool for processing a valve seat being used upon processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, the valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat. The valve mechanism is so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat. The processing tool includes a processing surface in the form of a convex spherical surface having the same curvature radius as the shut-off surface of the valve body.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The features of the present invention that are believed to be novel are set forth with particularity in the appended claims. The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments, together with the accompanying drawing, in which:
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FIG. 1 is a longitudinal sectional view showing a relief valve; -
FIG. 2 is a diagram illustrating a process for producing the relief valve; and -
FIG. 3 is a diagram illustrating a process for producing another relief valve. - A method of processing a valve mechanism according to a preferred embodiment of the present invention will now be described below. The present preferred embodiment is embodied in a method of processing a relief valve for use in a refrigerating circuit of an air conditioner functioning as a fluid circuit.
- First of all, the refrigerating circuit for the air conditioner will be described. As shown in
FIG. 1 , a refrigeratingcircuit 51 includes arefrigerant compressor 52, agas cooler 53, anexpansion valve 54 and anevaporator 55. Therefrigerant compressor 52 also includes asuction chamber 52 a, acompression chamber 52 b, adischarge chamber 52 c and acompressor housing 52 d. Therefrigerant compressor 52 introduces a refrigerant gas from thesuction chamber 52 a into thecompression chamber 52 b, compresses the introduced refrigerant gas therein, and discharges the compressed refrigerant gas into thedischarge chamber 52 c. Thegas cooler 53 cools down the refrigerant gas of high pressure from thedischarge chamber 52 c of therefrigerant compressor 52. Theexpansion valve 54 throttles the refrigerant gas from thegas cooler 53. Theevaporator 55 evaporates the refrigerant gas from theexpansion valve 54. A carbon dioxide is used as the refrigerant gas in the refrigeratingcircuit 51. Therefrigerant compressor 52 is equipped with arelief valve 10. - A structure of the
relief valve 10 will now be described. Still referring toFIG. 1 , therelief valve 10 has avalve housing 11 which forms a configuration thereof. Thevalve housing 11 includes afirst body 12 and a second body 13. Thefirst body 12 is screwed into thecompressor housing 52 d of therefrigerant compressor 52. The second body 13 is screwed onto thefirst body 12 while arranged outside thecompressor housing 52 d. Thefirst body 12 has a partitioningportion 14 which is screwed into the second body 13. The partitioningportion 14 of thefirst body 12 and the second body 13 define avalve chamber 15. The partitioningportion 14 separates thevalve chamber 15 from thedischarge chamber 52 c which is defined in thecompressor housing 52 d of therefrigerant compressor 52. The partitioningportion 14 has anend face 14 a which faces thevalve chamber 15. Theend face 14 a has a flat shape. - The
first body 12 has formed therethrough acommunication hole 16 which extends in a direction perpendicular to theend face 14 a of the partitioningportion 14. Thecommunication hole 16 interconnects thevalve chamber 15 and thedischarge chamber 52 c. Thedischarge chamber 52 c is regarded as a high-pressure region in the refrigeratingcircuit 51. The second body 13 has a circular wall which surrounds thevalve chamber 15, and the circular wall has formed a plurality ofports 13 a which radially extends therethrough. Thevalve chamber 15 is opened to the atmosphere through theports 13 a. That is, thedischarge chamber 52 c of therefrigerant compressor 52 and the atmosphere are in communication via thecommunication hole 16, thevalve chamber 15 and theports 13 a. - The
valve chamber 15 has accommodated therein avalve body 18 which is formed by a spherical body made of steel. Thevalve body 18 is movable with respect to theend face 14 of thepartitioning portion 14 in a direction in which thevalve body 18 is contacted with or separated from the partitioningportion 14. Thevalve chamber 15 also has accommodated therein aspring seat 19, which is movable in thevalve chamber 15. Thespring seat 19 has aseating face 19 a in the form of a conical hollow surface on the side of the end face 14 a of thepartitioning portion 14. The seating face 19 a of theseat spring 19 is contacted with thevalve body 18. Thevalve chamber 15 further has accommodated therein aspring 21 made of a coil spring. Thespring seat 19 is located on the opposite side to thepartitioning portion 14 in thevalve chamber 15 and supported through thespring 21 by the second body 13. Thespring 21 urges thevalve body 18 toward the end face 14 a of thepartitioning portion 14 through thespring seat 19. - The end of the
communication hole 16 located on the side of thevalve chamber 15 is opened on the end face 14 a of thepartitioning portion 14. In a state where thevalve body 18 contacts the end face 14 a of thepartitioning portion 14, a part of the outer surface (spherical surface) of thevalve body 18, in other words, a shut-off surface 18 a in the form of a convex spherical surface is contacted with the opening of thecommunication hole 16 in a circular region, thereby shutting off the communication between thecommunication hole 16 and thevalve chamber 15. That is, thecommunication hole 16 forms a valve hole, and the opening of thecommunication hole 16, which is formed on the end face 14 a of thepartitioning portion 14, forms avalve seat 24. Thevalve seat 24 is plated with a material such as tin, thereby relaxing a plastic deformation caused by the contact with thevalve body 18. Consequently, a sealing performance between thevalve seat 24 and thevalve body 18 is improved. - In a case where the pressure in the
discharge chamber 52 c of therefrigerant compressor 52 is not extraordinarily high, the force applied to thevalve body 18 in a valve opening direction (upward inFIG. 1 ) becomes small in accordance with the pressure in thecommunication hole 16. In this case, since the urging force of thespring 21 roughly controls the position of thevalve body 18, thevalve body 18 is in contact with thevalve seat 24. Therefore, thevalve body 18 shuts off the communication between thecommunication hole 16 and thevalve chamber 15, thereby preventing the refrigerant gas in thedischarge chamber 52 c from being released into the atmosphere. - From this state, if the pressure in the
discharge chamber 52 c is about to rise extraordinarily high for any reason, the force applied to thevalve body 18 in the valve opening direction (upward inFIG. 1 ) becomes excessive in accordance with the pressure in thecommunication hole 16. Therefore, thevalve body 18 is moved against the urging force of thespring 21 so as to be separate from theseat valve 24. When thecommunication hole 16 is connected to thevalve chamber 15 by the movement of thevalve body 18, the refrigerant gas in thedischarge chamber 52 c is released into the atmosphere through thecommunication hole 16, thevalve chamber 15 and theports 13 a, thereby preventing the pressure in thedischarge chamber 52 c from extraordinarily rising. - The pressure in the
discharge chamber 52 c at the time when thevalve body 18 starts to be separate from thevalve seat 24, in other words, the pressure in thedischarge chamber 52 c upon opening therelief valve 10, is set by adjusting the thickness of ashim 26 interposed between thefirst body 12 and the second body 13. That is, by adjusting the thickness of theshim 26, not only a screwing amount of the first body 12 (the partitioning portion 14) to the second body 13 but also the strength of the urging force of thespring 21, which is applied to thevalve body 18 in contact with thevalve seat 24, is adjusted. - A method of processing the
relief valve 10 will now be described. Referring toFIG. 2 , thefirst body 12, where the second body 13 ofFIG. 1 has not been screwed, is shown. In this state, aprocessing tool 31 which includes thevalve body 18 and a tool 32 for holding thevalve body 18 is prepared. Theprocessing tool 31 is positioned to thevalve seat 24 so that a center point S of thevalve body 18 locates on a central axis L of thecommunication hole 16 including the center of thevalve seat 24. - In this positioned state, the
processing tool 31 and thevalve seat 24 are relatively moved by an operation of a processing machine (not shown) in a direction in which theprocessing tool 31 and thevalve seat 24 approach each other. Therefore, the shut-offvalve 18 a of thevalve body 18 which the holding tool 32 holds, that is, a processing surface in the form of a convex spherical surface provided with theprocessing tool 31, which has the same curvature radius as the shut-off surface 18 a of thevalve body 18, is pushed against thevalve seat 24. The force of the processing machine that pushes thevalve body 18 against thevalve seat 24 through the holding tool 32 is set so as to have the value more than that of thespring 21 that pushes thevalve body 18 against thevalve seat 24 through thespring seat 19, for example, under the circumstances where the pressure differential between the pressure in thedischarge chamber 52 c and the atmosphere is not applied to thevalve body 18. By thus pushing thevalve body 18 of theprocessing tool 31 against thevalve seat 24, the shape of thevalve seat 24 is formed or plastically deformed from a circular line (whose cross sectional view is shown by chain double-dashed line in an enlarged circle A ofFIG. 2 ) to a three-dimensional shape along a part of the shut-off surface 18 a of thevalve body 18. - It is noted that the process in which the
valve seat 24 is plated is performed after the above-mentioned process in which thevalve seat 24 is formed by theprocessing tool 31. This processing order prevents the plating not only from hindering the formation of thevalve seat 24 by theprocessing tool 31 but also from being damaged by the pushing force of theprocessing tool 31. - The above-mentioned preferred embodiment has the following advantageous effects.
- (1) The
valve seat 24 is previously plastically deformed into its suitable state by theprocessing tool 31 so as not to be plastically deformed in a state that a contacting position of thevalve body 18 with thevalve seat 24 is deviated from the suitable position. Therefore, thecommunication hole 16 of therelief valve 10 is securely blocked by thevalve body 18 which contacts thevalve seat 24 along the form of the plastic deformation, thereby preventing the refrigerant gas from leaking from thedischarge chamber 52 c to the atmosphere in a state that the pressure in thedischarge chamber 52 c is not extraordinarily high, and improving the performance of the refrigeratingcircuit 51, accordingly. - (2) The
valve body 18 is used for theprocessing tool 31. By thus forming thevalve seat 24 with theactual valve body 18 for use in therelief valve 10, the formation is suitably performed. - (3) In order to push the
valve body 18 against thevalve seat 24 so as to resist a relatively large pressure differential between the inside and the outside of the refrigeratingcircuit 51, therelief valve 10 requires thespring 21 whose urging force is relatively large. Heretofore, thevalve seat 24 was easily plastically deformed into its unsuitable state by pushing thevalve body 18 against thevalve seat 24 with a relatively large force. The present embodiment of the present invention is particularly effective to be embodied in the method of processing therelief valve 10. - (4) Since in a case where a carbon dioxide is used as a refrigerant in the refrigerating
circuit 51, a high-pressure region (discharge chamber 52 c) in the refrigeratingcircuit 51 becomes extraordinarily high pressure, for example, in comparison with a case where a chlorofluorocarbon is used as the refrigerant in the refrigeratingcircuit 51, aspring 21 whose urging force is further large is needed. Therefore, in the prior art, thevalve body 18 was pushed against thevalve seat 24 further strongly and thevalve seat 24 was easily plastically deformed into its unsuitable state, accordingly. That is, the present invention is particularly effective to be embodied in a method of processing therelief valve 10 provided in the refrigeratingcircuit 51 which uses carbon dioxide. - The present invention is modified within the scope of the appended claims, as exemplified below.
- As shown in
FIG. 3 , when therelief valve 10 is processed, a member that is different from thevalve body 18 may be used as aprocessing tool 41 for forming thevalve seat 24. Theprocessing tool 41 ofFIG. 3 has a rod-like shape and has on the end of the rod-like shape aprocessing surface 41 a which forms a hemispherical surface functioning as a convex spherical surface. Theprocessing surface 41 a of theprocessing tool 41 has the same curvature radius as the shut-off surface 18 a of thevalve body 18. Theprocessing tool 41 is pushed against thevalve seat 24 through theprocessing surface 41 a, thereby forming thevalve seat 24. - In the above-modified embodiment, the different member from the
valve body 18 is used as theprocessing tool 41. That is, the different member from thevalve body 18 is used exclusively as theprocessing surface 41 a of theprocessing tool 41. By providing theprocessing tool 41 with theexclusive processing surface 41 a, thevalve seat 24 is efficiently formed. This technique is suitable for the mass production of therelief valve 10. Such an effect is accomplished even by modifying the above-preferred embodiment so as to replace thevalve body 18 of theprocessing tool 31 by a spherical body used exclusively for forming. - In the above-preferred embodiment, the
relief valve 10 has used the spherical body (a ball valve) as thevalve body 18. However, thevalve body 18 of therelief valve 10 is not limited to the spherical body if it has the shut-off surface in the form of convex spherical surface. A hemispherical body may be used as thevalve body 18. That is, the processing method according to the present invention may be adapted for the valve mechanism using the valve body other than the valve body in the form of spherical body. - In the above-preferred embodiment, the
relief valve 10 has used the coil spring as thespring 21. However, thespring 21 of therelief valve 10 is not limited to the coil spring. A leaf spring may be used as thespring 21. That is, the processing method according to the present invention may be adapted for the valve mechanism using the spring other than the coil spring. - In the above-preferred embodiment, the present invention is embodied in the method of processing the
relief valve 10. In a modified embodiment to the preferred embodiment, the present invention is embodied in a method of processing a valve mechanism which relieves the pressure in a crank chamber of therefrigerant compressor 52 to a low-pressure region in the refrigeratingcircuit 51 when the pressure becomes extraordinarily high. - The present invention is not limited to be embodied in a method of processing a valve mechanism provided with a refrigerating circuit which uses a carbon dioxide as a refrigerant, but may be embodied in a method of processing a valve mechanism provided with a refrigerating circuit which uses a chlorofluorocarbon as the refrigerant.
- The present invention is not limited to be embodied in the method of processing the valve mechanism provided with the refrigerating circuit, but may be embodied in a method of processing a valve mechanism provided with an air circuit or a hydraulic circuit.
- Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive and the invention is not to be limited to the details given herein but may be modified.
Claims (9)
1. A method of processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, a valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat, the valve mechanism being so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat, the method comprising the steps of:
preparing a processing tool having a processing surface in the form of a convex spherical surface which has the same curvature radius as the shut-off surface of the valve body;
positioning the processing tool to the valve seat; and
forming the valve seat along the form of the processing surface by pushing the processing surface of the processing tool against the valve seat.
2. The method according to claim 1 , wherein the valve body is used for the processing tool.
3. The method according to claim 1 , wherein a member different from the valve body is used for the processing tool.
4. The method according to claim 1 , wherein the valve mechanism is a relief valve for use in a hydraulic circuit.
5. The method according to claim 4 , wherein the hydraulic circuit is a refrigerating circuit for an air conditioner, the refrigerating circuit using a carbon dioxide as a refrigerant.
6. The method according to claim 1 , wherein the force that pushes the processing tool against the valve seat is set so as to have the value more than that of the spring that pushes the valve body against the valve seat, under the circumstances where pressure differential is not applied to the valve body.
7. The method according to claim 1 , further comprising the step of:
plating the valve seat after the forming process of the valve seat.
8. A tool for processing a valve seat being used upon processing a valve mechanism which includes a valve body having a shut-off surface in the form of a convex spherical surface, a valve hole whose opening degree is adjusted by the valve body, the valve seat formed by an opening of the valve hole, and a spring which urges the valve body toward the valve seat, the valve mechanism being so formed that the valve body resists the urging force of the spring in accordance with the pressure increase in the valve hole to be separate from the valve seat, comprising:
a processing surface in the form of a convex spherical surface having the same curvature radius as the shut-off surface of the valve body.
9. The processing tool according to claim 8 , wherein the processing surface of the processing tool is the shut-off surface of the valve body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-005945 | 2004-01-13 | ||
JP2004005945A JP2005201303A (en) | 2004-01-13 | 2004-01-13 | Valve device manufacturing method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050150109A1 true US20050150109A1 (en) | 2005-07-14 |
Family
ID=34616850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/032,283 Abandoned US20050150109A1 (en) | 2004-01-13 | 2005-01-10 | Method of processing valve mechanism |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050150109A1 (en) |
EP (1) | EP1555470A1 (en) |
JP (1) | JP2005201303A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112955634A (en) * | 2018-10-02 | 2021-06-11 | 汉斯延森注油器公司 | Improved lubricator pump unit and lubrication system for large low-speed two-stroke engines by deforming valve seats, and improved lubricator pump unit |
US11204103B2 (en) | 2017-11-13 | 2021-12-21 | Hamilton Sundstrand Corporation | Coined seat for metal-to-metal seating |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019100666A (en) * | 2017-12-06 | 2019-06-24 | 株式会社デンソー | Relief valve |
WO2022202422A1 (en) * | 2021-03-24 | 2022-09-29 | Ntn株式会社 | Electric pump |
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US2271031A (en) * | 1938-01-22 | 1942-01-27 | Automotive Prod Co Ltd | Valve mechanism for liquid pressure control systems |
US2841174A (en) * | 1954-12-14 | 1958-07-01 | Charles F Frye | Valve |
US3726640A (en) * | 1969-06-09 | 1973-04-10 | Schroers Co Textilausruest | Methods to pattern and to dye single colored textiles,especially carpets,with different colors or tones |
US3736640A (en) * | 1970-12-15 | 1973-06-05 | Fmc Corp | Method of forming a metal valve seat |
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US4658608A (en) * | 1984-11-09 | 1987-04-21 | Fox Douglas M | Security valve mechanism for a hydraulic system |
US4776430A (en) * | 1987-04-13 | 1988-10-11 | Rule Morris M | Crankcase drainage device |
US5107890A (en) * | 1990-05-03 | 1992-04-28 | Huron Products Industries, Inc. | Ball check valve |
US5279752A (en) * | 1989-02-22 | 1994-01-18 | Nippon Oil Co., Ltd. | Composition for lubricating oil |
US5467964A (en) * | 1993-05-28 | 1995-11-21 | Dart Engineering Ag | Quick coupling component with pressure reduction member |
US6223435B1 (en) * | 1998-11-16 | 2001-05-01 | Demetrios Stavrakis | One-piece tipless valve housing |
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FR2363044A1 (en) * | 1976-08-27 | 1978-03-24 | Wabco Westinghouse | Ball valve for fluid circuit - has spring biassed ball acted on by preload to slightly deform conical outlet passage and define seat |
DE4111381A1 (en) * | 1991-04-09 | 1992-10-15 | Kloeckner Humboldt Deutz Ag | Valve seat for internal combustion engine - has plastically deformable coating for running=in period |
JPH11324909A (en) * | 1998-05-18 | 1999-11-26 | Sanden Corp | Variable displacement compressor |
EP1128109A1 (en) * | 2000-02-22 | 2001-08-29 | Siemens Building Technologies AG | Valve for control device |
-
2004
- 2004-01-13 JP JP2004005945A patent/JP2005201303A/en active Pending
- 2004-12-29 EP EP04030953A patent/EP1555470A1/en not_active Withdrawn
-
2005
- 2005-01-10 US US11/032,283 patent/US20050150109A1/en not_active Abandoned
Patent Citations (11)
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---|---|---|---|---|
US2271031A (en) * | 1938-01-22 | 1942-01-27 | Automotive Prod Co Ltd | Valve mechanism for liquid pressure control systems |
US2841174A (en) * | 1954-12-14 | 1958-07-01 | Charles F Frye | Valve |
US3726640A (en) * | 1969-06-09 | 1973-04-10 | Schroers Co Textilausruest | Methods to pattern and to dye single colored textiles,especially carpets,with different colors or tones |
US3736640A (en) * | 1970-12-15 | 1973-06-05 | Fmc Corp | Method of forming a metal valve seat |
US4064889A (en) * | 1976-02-17 | 1977-12-27 | Sun Oil Company Of Pennsylvania | Break-away safety valve |
US4658608A (en) * | 1984-11-09 | 1987-04-21 | Fox Douglas M | Security valve mechanism for a hydraulic system |
US4776430A (en) * | 1987-04-13 | 1988-10-11 | Rule Morris M | Crankcase drainage device |
US5279752A (en) * | 1989-02-22 | 1994-01-18 | Nippon Oil Co., Ltd. | Composition for lubricating oil |
US5107890A (en) * | 1990-05-03 | 1992-04-28 | Huron Products Industries, Inc. | Ball check valve |
US5467964A (en) * | 1993-05-28 | 1995-11-21 | Dart Engineering Ag | Quick coupling component with pressure reduction member |
US6223435B1 (en) * | 1998-11-16 | 2001-05-01 | Demetrios Stavrakis | One-piece tipless valve housing |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11204103B2 (en) | 2017-11-13 | 2021-12-21 | Hamilton Sundstrand Corporation | Coined seat for metal-to-metal seating |
CN112955634A (en) * | 2018-10-02 | 2021-06-11 | 汉斯延森注油器公司 | Improved lubricator pump unit and lubrication system for large low-speed two-stroke engines by deforming valve seats, and improved lubricator pump unit |
Also Published As
Publication number | Publication date |
---|---|
EP1555470A1 (en) | 2005-07-20 |
JP2005201303A (en) | 2005-07-28 |
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