JP2016035284A - Structure for fixing diaphragm to drive shaft, method for fixing diaphragm to drive shaft, diaphragm and electromagnetic control valve - Google Patents

Abstract

In an electromagnetic control valve that uses a diaphragm to cancel a force acting on a valve body due to a differential pressure, the pressure resistance and durability of the diaphragm are improved.
A diaphragm 4 includes a base cloth 4A and a rubber layer 4B. An opening 4B1 is formed in the center of the rubber layer 4B only, and the exposed portion 4A1 of the base fabric 4A is exposed in the opening 4B1. The needle cap 40 is attached to the end of the coupling shaft 321 of the valve body 31. The center of the exposed portion 4A1 of the base cloth 4A of the diaphragm 4 is pierced through the needle cap 40 and the coupling shaft 321. The connecting hole 31 b of the valve body 31 is fitted to the coupling shaft 321. The lower end portion of the coupling shaft 321 is caulked.
[Selection] Figure 4

Description

  The present invention relates to a structure for fixing a diaphragm to a drive shaft and a fixing method for fixing a flexible diaphragm embedded with a base fabric in a pressure balance type electromagnetic control valve, for example, the diaphragm and the electromagnetic type It relates to a control valve.

  Conventionally, as an electromagnetic control valve, for example, there is one disclosed in International Publication No. 2013/157292 (Patent Document 1). In this electromagnetic control valve, a valve stem having a valve body is disposed in a valve housing, the valve stem is displaced in the axial direction by electromagnetic force generated by energization of an electromagnetic coil, and the valve port is opened by the valve body. The degree is adjusted. In addition, the differential pressure between the pressure equalizing chamber communicated with the primary chamber on the high pressure side and the low pressure chamber communicated with the low pressure secondary chamber is applied to the valve rod via the diaphragm, so that the primary chamber and the secondary chamber The pressure acting on the valve body of the valve stem is canceled (cancelled). As a result, this pressure balance type electromagnetic control valve is not affected by the differential pressure between the primary chamber side pressure and the secondary chamber side pressure, and maintains a constant valve opening at a constant current. It becomes possible to control the flow rate.

  Moreover, in the thing of patent document 1, the diaphragm of the lower end of a valve body has a centripetal action, By connecting a valve body to this diaphragm, a valve body can be made into the center axis | shaft of a main body, without providing a guide part in a main body etc. Located above. Further, the diaphragm is connected by inserting a diaphragm guide into the needle-like protrusion at one end of the valve body without drilling a hole in the center of the diaphragm, and then caulking the lower end of the valve body. The body and the diaphragm are connected.

International Publication No. 2013/157292

  In the thing of patent document 1, since the needle-like protrusion of the one end of the valve body which connects a diaphragm is thin, a diaphragm can be penetrated easily, but when the diameter of the drive shaft which connects this diaphragm is large, it is fixed as mentioned above. In the structure, the following problems occur. That is, when the diameter of the drive shaft connecting the diaphragm is large, it is difficult to push the base fabric embedded in the rubber of the diaphragm to the thick drive shaft diameter with the needle-like protrusions. The thread is cut and damaged. In addition, if the rubber film that is spread out remains in the shape of a burr at the contact portion of the drive shaft with the valve, there is a problem that the valve body tilts when the valve body is fixed by caulking.

  In general, a rubber diaphragm or the like containing a base fabric has airtightness at the rubber portion and pressure resistance at the base fabric portion. Since the pressure resistance of the diaphragm depends on the strength of the base fabric, if the base fabric is cut and used at a high pressure, the rubber stretches due to the pressurization and the base fabric is also pulled, and the rubber layer at the cut site When the base fabric is removed from the diaphragm, the pressure resistance of the diaphragm is significantly lowered and the diaphragm is damaged. If the diaphragm is damaged, the control valve becomes uncontrollable. In addition, if the valve body is tilted when the valve body is caulked, it may cause valve leakage.

  The present invention has been made in order to solve the above-described problems, and has improved the structure for fixing the diaphragm to the drive shaft so as to cancel the force acting on the valve body due to the differential pressure using the diaphragm, for example. An object of the present invention is to improve the pressure resistance and durability of the diaphragm in the electromagnetic control valve.

  The structure for fixing a diaphragm to a drive shaft according to claim 1 is a structure for fixing a diaphragm to a drive shaft for fixing a diaphragm having a base layer embedded in a rubber layer to the drive shaft, and the rubber is centered on the rubber as the diaphragm. A diaphragm in which an opening having a diameter matching the diameter of the drive shaft is formed only in the layer is used, and the base fabric of the opening portion of the diaphragm is pierced by the drive shaft so that the drive shaft is penetrated by the diaphragm. A fixed member is fixed to the drive shaft, and the diaphragm is fixed to the drive shaft.

  The structure for fixing the diaphragm to the drive shaft according to claim 2 is the structure for fixing the diaphragm to the drive shaft according to claim 1, wherein the fixing member is formed with an insertion hole through which the drive shaft is inserted. The end of the drive shaft through which the insertion hole of the presser member is inserted is caulked, and the presser member is fixed to the drive shaft.

  A method for fixing a diaphragm to a drive shaft according to claim 3 is a method for fixing a diaphragm to a drive shaft for fixing a diaphragm having a base fabric embedded in a rubber layer to the drive shaft, wherein the rubber is centered as the diaphragm. An opening having a diameter that matches the diameter of the drive shaft is formed only in the layer, and a diaphragm in which the base fabric is exposed in the opening is removably attached to the end of the drive shaft, The needle-shaped cap is pierced with the base cloth in the opening of the diaphragm, the needle-shaped cap and the drive shaft are passed through the diaphragm, the needle-shaped cap is removed, and the needle-shaped cap is removed. The fixing member is fixed to the drive shaft.

  The method for fixing the diaphragm to the drive shaft according to claim 4 is the method for fixing the diaphragm to the drive shaft according to claim 3, wherein the presser member is formed with an insertion hole through which the drive shaft is inserted as the fixing member. A member is used, and the end of the driving shaft through which the insertion hole of the pressing member is inserted is caulked to fix the pressing member to the driving shaft.

  The diaphragm according to claim 5 is a diaphragm in which a base fabric is embedded in a rubber layer, wherein an opening is formed only in the rubber layer at the center and the base fabric is exposed in the opening. .

  The electromagnetic control valve according to claim 6 is configured such that a valve chamber and a valve port are formed between the first port and the second port, and the valve body in the valve chamber is driven by an electromagnetic drive unit. An electromagnetic control valve that opens and closes the valve, and the force acting on the valve body by the differential pressure between the first port and the second port is controlled by the differential pressure between the valve chamber and the pressure equalizing chamber applied to the pressure sensing portion. In the electromagnetic control valve that cancels out by the force acting on the valve body and changes the opening degree of the valve port proportionally by the balance between the electromagnetic force of the electromagnetic drive unit and the spring force of the adjustment spring, the electromagnetic drive Part, the adjusting spring, the pressure equalizing chamber, and the pressure sensing part are provided on the axis opposite to the valve port with respect to the valve body on the axis of the valve port, and the valve body is provided with the electromagnetic drive unit. The valve is fixed to the drive shaft of the connecting portion connected to the valve, and the pressure-sensitive portion is embedded in a rubber layer with a base fabric embedded in the valve. Between the pressure equalizing chamber and an opening having a diameter matching the diameter of the drive shaft only in the rubber layer at the center. The base cloth in the opening portion of the diaphragm is stabbed, the drive shaft is penetrated through the diaphragm, the valve body is fixed to the drive shaft, and the diaphragm is fixed to the drive shaft. .

  An electromagnetic control valve according to a seventh aspect is the electromagnetic control valve according to the sixth aspect, wherein a pressure equalizing path that connects the valve port and the pressure equalizing chamber is formed in the valve body and the connecting portion. It is characterized by.

  According to the structure for fixing the diaphragm to the drive shaft according to the first aspect, a diaphragm in which an opening having a diameter matching the diameter of the drive shaft is formed only in the rubber layer at the center is used as the diaphragm. And the base fabric of the opening part of a diaphragm is stabbed by the drive shaft, and this drive shaft is penetrated by the diaphragm. Therefore, when there is no rubber in the opening when the drive shaft is inserted into the base fabric, the fibers of the base fabric can be easily extended, and the fibers of the base fabric are not cut. Therefore, the pressure resistance and durability of the diaphragm can be improved.

  According to the structure for fixing the diaphragm to the drive shaft according to the second aspect, in addition to the effect of the first aspect, the pressing member can be firmly fixed to the drive shaft together with the diaphragm.

  According to the method for fixing the diaphragm to the drive shaft according to the third aspect, the same effect as the first aspect can be obtained.

  According to the method for fixing the diaphragm to the drive shaft according to the fourth aspect, the same effect as in the second aspect can be obtained.

  According to the diaphragm of claim 5, by setting the diameter of the opening formed only in the rubber layer to a diameter that matches the diameter of the drive shaft, when fixed to the drive shaft at this opening portion, A highly durable diaphragm can be obtained.

  According to the electromagnetic control valve of the sixth aspect, an electromagnetic control valve having high diaphragm pressure resistance and durability can be obtained.

  According to the electromagnetic control valve of the seventh aspect, in addition to the effect of the sixth aspect, since the pressure equalizing path is formed in the valve body and the connecting portion, it is not necessary to provide a pressure equalizing path in another part, and the electromagnetic control valve In addition to reducing the size of the control valve, the pressure resistance and durability of the diaphragm can be ensured even when the solenoid control valve has a connecting shaft having a large drive shaft diameter due to a pressure equalizing path.

It is a longitudinal cross-sectional view of the valve closed state of the electromagnetic control valve of the embodiment to which the present invention is applied. It is the schematic plan view and sectional drawing before fixation of the diaphragm in embodiment to which this invention is applied. It is a longitudinal cross-sectional view of the shaping die of the diaphragm in embodiment to which this invention is applied. It is a figure explaining the assembly process of the principal part of the electromagnetic control valve of embodiment to which this invention is applied.

  Next, an embodiment of the present invention will be described. FIG. 1 is a longitudinal sectional view of the electromagnetic control valve of the embodiment in a closed state. The electromagnetic control valve of this embodiment has a valve housing 1 composed of a lower main body 1A and an upper main body 1B. The lower main body 1A is fitted into the lower fitting hole 1B1 of the upper main body 1B, and the lower main body 1A and the upper main body 1B are integrally fixed by caulking the opening end of the fitting hole 1B1.

  The lower main body 1 </ b> A is formed with a first port 11 on the high pressure side through which a fluid flows, as shown by an arrow, and a valve chamber 12 communicating with the first port 11. Further, the lower main body 1A is formed with a valve seat fitting hole 1A1 below the valve chamber 12, and the valve seat member 2 is fitted into the valve seat fitting hole 1A1. And the lower main body 1A and the valve seat member 2 are integrally fixed by caulking the opening end of the valve seat fitting hole 1A1. The space between the valve seat member 2 and the valve seat fitting hole 1A1 is sealed with an O-ring 2a. Further, a pressure equalizing chamber 13 is formed in the upper main body 1B, and a plunger case 51 and a cover 6 as a case of an electromagnetic drive unit 5 described later are fitted and fixed to the upper portion of the pressure equalizing chamber 13.

  The valve seat member 2 is formed with a second port 21 on the low pressure side through which a fluid flows out, as shown by an arrow, and a valve port 22 communicating the second port 21 and the valve chamber 12. The valve port 22 has a circular horizontal sectional shape centering on the axis L, and a ring-shaped valve seat 23 is disposed around the opening on the valve chamber 12 side.

  A valve member 3 that is displaceable in a direction along the axis L extends in the valve chamber 12 and the pressure equalizing chamber 13. The valve member 3 is located in the valve chamber 12 and can be attached to and detached from the valve seat 23 of the valve seat member 2, and a connecting portion 32 extending above the valve body 31. It consists of and. The connecting portion 32 includes a connecting shaft 321 for connecting the valve body 31 to the lower end portion, a boss portion 322 having a diameter larger than that of the connecting shaft 321 and positioned in the pressure equalizing chamber 13, and a connecting portion extending above the boss portion 322. Rod 323.

  A rubber diaphragm 4 is disposed between the valve body 31 and the boss portion 322. The diaphragm 4 includes a convolution part 41, an inner bead part 42 inside the convolution part 41, and an outer bead part 43 outside the convolution part 41. Moreover, the valve body 31 has the opening hole 31a which connected cylindrical shape and mortar shape in the center, and the connection hole 31b continuous with the opening hole 31a. The coupling shaft 321 of the coupling portion 32 passes through the opening of the inner bead portion 42 of the diaphragm 4 and is fitted into the coupling hole 31 b of the valve body 31, and the inner bead portion 42 is formed by the valve body 31 and the boss portion 322. Is compressed and the lower end portion of the coupling shaft 321 is caulked, whereby the valve body 31, the diaphragm 4, and the connecting portion 32 are fixed integrally. In addition, the assembly method of these valve body 31, the diaphragm 4, and the coupling shaft 321 is mentioned later.

  The outer bead portion 43 of the diaphragm 4 is sandwiched between the upper end of the lower main body 1A and the lower opening end portion of the pressure equalizing chamber 13 of the upper main body 1B. The upper end of the valve body 31 (near the lower side of the valve member 3) is normally held on the axis L by the automatic centripetal action by the restoring force of the diaphragm 4 generated by applying pressure.

  In the connecting portion 32, the boss portion 322 is formed with a first pressure equalizing path 32a extending in the direction of the axis L from the opening hole 31a side of the valve body 31, and intersects with the first pressure equalizing path 32a. A second pressure equalizing path 32 b that opens to the pressure chamber 13 is formed. The first pressure equalizing path 32a, the second pressure equalizing path 32b, and the opening hole 31a of the valve body 31 constitute a pressure equalizing path, and the valve port 22 and the pressure equalizing chamber 13 include the opening hole 31a and the first pressure equalizing path. The pressure equalizing path 32a and the second pressure equalizing path 32b are electrically connected.

  The diaphragm 4 is flexible, and the pressure (P1) of the first port 11 acting on the valve chamber 12 side of the diaphragm 4 and the pressure (P2) of the second port 21 acting on the pressure equalizing chamber 13 side. The pressure-sensitive part which transmits the force generated by the differential pressure to the valve member 3 (valve body 31) is configured. Further, the diaphragm 4 hermetically partitions the pressure equalizing chamber 13 and the valve chamber 12.

  An electromagnetic drive unit 5 is provided on the upper portion of the valve housing 1. The electromagnetic drive unit 5 includes a cylindrical plunger case 51, an attractor 52 made of a magnetic material fixed to the upper end of the plunger case 51, a plunger 53 made of a magnetic material provided in the plunger case 51, and a plunger case 51 and an electromagnetic coil 54 having a winding wound around a bobbin 54a. The plunger case 51 and the suction element 52 are fixed by welding or the like. An insertion hole 52a coaxial with the axis L is formed in the suction element 52, and an adjustment portion hole 52b having a diameter larger than that of the insertion hole 52a is formed on the other side of the insertion hole 52a.

  The plunger 53 is formed with a cylindrical plunger spring chamber 53a coaxial with the axis L and an insertion hole 53b, and a plunger pressure equalizing path 53c is formed beside the insertion hole 53b. The suction element 52 and the plunger 53 are rotationally symmetric with respect to the axis L, except for the plunger pressure equalizing path 53c.

  A cover 6 positioned on the electromagnetic drive unit 5 side with respect to the pressure equalizing chamber 13 is disposed below the plunger case 51. The cover 6 is sandwiched and fixed between the lower end of the plunger case 51 and the upper main body 1B. An insertion hole 6 a that is coaxial with the axis L is formed at the center of the cover 6. As long as the cover 6 does not move relative to the valve housing 1 (main body), the fixing method may be any configuration. In this way, since the cover 6 is fixed relative to the valve member 3 in the direction of the axis L, the movable parts such as the plunger 53 are not affected by the dynamic pressure of the fluid.

  The connecting rod 323 of the valve member 3 is inserted through the insertion hole 6 a of the cover 6 and the insertion hole 53 b of the plunger 53. In addition, the ball receiver 7 made of a nonmagnetic material is fitted into the end of the connecting rod 323 in the insertion hole 52 a of the attractor 52. The ball receiver 7 and the end of the connecting rod 323 are fixed by welding. The ball receiver 7 has a hook-like portion at the end on the plunger 53 side, and this hook-like portion is in contact with the opposite surface 53d of the plunger 53 on the suction element 52 side, and the opposite surface 53d and the suction element 52 are in contact with each other. It is located between the opposing surface 52d on the plunger 53 side.

  A plunger spring 531 is disposed in a compressed state between the plunger 53 and the step portion 323 a of the connecting rod 323. Accordingly, the plunger 53 is in a state in which the opposing surface 53d is always in contact with the ball receiver 7, and when the plunger 53 is sucked in the direction of the suction element 52, the valve member 3 is moved in the valve opening direction together with the plunger 53. Displace. The valve member 3 is connected to the plunger 53 by a connecting rod 323 that is a part of the valve member 3. The clearance between the insertion hole 53b of the plunger 53 and the connecting rod 323 of the valve member 3 is set to be larger than the clearance between the plunger 53 and the plunger case 51, and even if the plunger 53 is displaced in the direction orthogonal to the axis L, The valve member 3 and the plunger 53 do not contact.

  A setting adjustment portion 8 is disposed in the adjustment portion hole 52 c of the suction element 52. The setting adjustment unit 8 includes an adjustment screw 81, a spring receiver 82, an adjustment spring 83, and a ball 84. The adjustment spring 83 is disposed in a compressed state between the adjustment screw 81 and the spring receiver 82, and the ball 84 is disposed in the insertion hole 52 a of the suction element 52 on the axis L while being in contact with the spring receiver 82. It is installed. The adjustment spring 83 urges the ball 84 to contact the upper end of the ball receiver 7 via the spring receiver 82. The adjustment screw 81 is attached to the suction element 52 by screwing a male screw part 811 on the outer periphery thereof with a female screw part 52 e formed on the upper inner peripheral surface of the suction element 52.

  A slight clearance is provided between the ball 84 and the insertion hole 52a of the suction element 52, and the ball 84 can be displaced along the axis L in the insertion hole 52a. The ball receiver 7 is in spherical contact with the ball 84. Thereby, the upper end of the ball receiver 7 (and the valve member 3) is always positioned on the axis L.

  By energizing the electromagnetic coil 54 of the electromagnetic drive unit 5, a magnetic circuit is formed and a magnetic attractive force is generated between the attractor 52 and the plunger 53. This attraction force is in accordance with the current supplied to the electromagnetic coil 54.

  With the above configuration, the electromagnetic control valve according to the embodiment operates as follows. The setting adjustment unit 8 urges the valve member 3 toward the valve seat 23 of the valve seat member 2 via the spring receiver 82, the ball 84, and the ball receiver 7 by the adjustment spring 83. By exciting the electromagnetic coil 54, the plunger 53 is attracted by the attractor 52, and the valve member 3 is displaced in a direction away from the valve seat 23 against the biasing force of the adjustment spring 83. In addition, the opening degree of the valve port 22 is controlled by the positional relationship between the valve body 31 and the valve seat 23 in the direction along the axis L. The position where the plunger 53 is fully open when the plunger 53 is at the uppermost position is the position where the bowl-shaped portion of the ball receiver 7 is in contact with the opposing surface 52 d of the suction element 52. In this way, the ball receiver 7 prevents the plunger 53 from being attracted (adhered) to the suction element 52.

  Further, by eliminating the excitation of the electromagnetic coil 54, the valve body 31 is seated on the valve seat 23 and the valve is closed. The biasing force applied by the adjustment spring 83 to the valve member 3 is adjusted by the amount of driving of the adjustment screw 81, and the electromagnetic force (suction force) necessary for opening the valve can be adjusted. In this way, the valve member 3 is displaced in the direction along the axis L due to the balanced relationship between the electromagnetic force generated by the electromagnetic coil 54 and the spring force of the adjustment spring 83, and the opening degree of the valve port 22 is changed by the valve body 31. Let

  Further, as described above, a differential pressure between the pressure in the valve chamber 12 and the pressure in the second port 21 acts on the valve body 31 to apply a force in the valve closing direction. On the other hand, the pressure equalizing chamber 13 communicates with the valve port 22 and the second port 21 through the first pressure equalizing path 32a, the second pressure equalizing path 32b, and the opening hole 31a (pressure equalizing path). A differential pressure between the pressure of the second port 21 acting on the chamber 13 and the pressure of the valve chamber 12 acts on the diaphragm 4, and a force in the valve opening direction is applied to the valve member 3. Since the effective pressure receiving diameter D1 of the valve body 31 (in this embodiment, the inner diameter of the valve seat 23) is equal to the effective pressure receiving diameter D2 of the diaphragm 4, a force due to the differential pressure is applied to the valve member 3. Are mutually canceled (offset), and the opening and closing of the valve body 31 is not affected by the differential pressure.

  In this way, the balance between the electromagnetic force corresponding to the applied current of the electromagnetic drive unit 5 and the spring force of the adjustment spring 83 is achieved, and the valve body 31 is caused by the differential pressure between the first port 11 and the second port 21. The acting force is canceled (offset) by the force acting on the valve body 31 due to the differential pressure between the valve chamber 12 and the pressure equalizing chamber 13 applied to the diaphragm 4 (pressure sensing portion), so that the differential pressure exerts on the valve body 31. The influence of the acting force can be eliminated, and the opening degree of the valve port 22 can be changed proportionally with a small energization amount.

  In this embodiment, since only the second port 21 is provided below the valve port 22, the length of the valve housing 1 in the direction of the axis L can be reduced, and electromagnetic control is performed. The valve itself can be reduced in size. Further, since the second port 21 communicates coaxially with the valve port 22, the pressure loss at the second port 21 is also reduced, and the fluid flows smoothly.

  2A and 2B are a schematic plan view (FIG. 2A) and a cross-sectional view (FIG. 2B) before the diaphragm 4 is fixed to the valve member 3 (connecting portion 32). The diaphragm 4 has a base fabric 4A embedded in a rubber layer 4B. 2A conceptually illustrates the yarn of the base fabric 4A with a line, the base fabric 4A is knitted by tricot knitting. An opening 4B1 is formed at the center of the rubber layer 4B. The diameter of the opening 4 </ b> B <b> 1 is a diameter that matches the diameter of the base portion 321 a of the coupling shaft 321 as the “drive shaft”. The exposed portion 4A1 of the base fabric 4A is exposed at the opening 4B1.

  FIG. 3 is a sectional view of a molding die for molding the diaphragm 4, and is composed of a lower die 10 and an upper die 20. When the diaphragm 4 is molded, raw rubber is filled into a cavity 30 formed by combining the lower mold 10 and the upper mold 20 as shown in FIG. A base cloth 4A is disposed in the cavity 30 filled with raw rubber. Then, the pressurized rubber is heated and sulfided to form the diaphragm 4. Here, at the center of the lower mold 10, a thin columnar base 10 </ b> A having the same diameter as the base 321 a of the coupling shaft 321 is provided. At the center of the upper mold 20, a thin columnar ceiling portion 20 </ b> A having the same diameter as the base portion 321 a of the coupling shaft 321 is provided. Then, the base portion 10A of the lower mold 10 and the ceiling portion 20A of the upper mold 20 are in contact with each other through the base cloth 4A. Thereby, the opening 4B1 of the rubber layer 4B and the exposed portion 4A1 of the base fabric 4A exposed to the opening 4B1 are formed. In this way, the diaphragm 4 is obtained in which the opening 4B1 having a diameter matching the diameter of the base 321a (drive shaft) is formed only in the rubber layer 4B.

  FIG. 4 is a diagram illustrating an assembly process of the main part of the electromagnetic control valve according to the embodiment. The valve body 31 as the “holding member”, the diaphragm 4, and the base 321 a of the coupling shaft 321 as the “drive shaft” are fixed. Is done as follows. As shown in FIG. 4A, the needle cap 40 is fitted into the coupling shaft 321. The center of the diaphragm 4 (the center of the exposed portion 4A1 of the base cloth 4A of the opening 4B1) is inserted into the needle cap 40 and the coupling shaft 321. As shown in FIG. 4B, the needle cap 40 and the coupling shaft 321 are attached. The diaphragm 4 is penetrated. Then, the opening 4B1 of the diaphragm 4 is inserted to the base 321a of the coupling shaft 321.

  Next, as shown in FIG. 4C, the needle-like cap 40 is removed, and the connecting hole 31 b of the valve body 31 is fitted to the connecting shaft 321 of the connecting portion 32. And as shown in FIG.4 (D), the valve body 31, the diaphragm 4, and the connection part 32 are fixed integrally by crimping the lower end part of the coupling shaft 321. As shown in FIG.

  In the embodiment, the weaving method of the base fabric 4A is tricot weaving, and the stretchability is high, and the needle cap 40 is easily stabbed into the base fabric 4A and easily spread. The type of weaving of the base fabric 4A may be circular knitting with high extensibility. Further, at the time of diaphragm molding, since it is difficult to maintain the position of the base fabric in the rubber, it may be “preformed” with the base fabric alone before molding.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The drive shaft is not limited to that of the valve member 3 (valve rod) of the electromagnetic control valve, and can be applied to other devices and other structures as long as the diaphragm is fixed to the drive shaft moved in the axial direction. High pressure resistance and durability of the diaphragm can be obtained.

DESCRIPTION OF SYMBOLS 1 Valve housing 1A Lower main body 1B Upper main body 11 1st port 12 Valve chamber 13 Pressure equalizing chamber 2 Valve seat member 21 2nd port 22 Valve port 3 Valve member 31 Valve body 32 Connection part 321 Connection shaft (drive shaft)
321a Base (drive shaft)
4 Diaphragm 4A Base cloth 4A1 Exposed part 4B Rubber layer 4B1 Opening 41 Convolution part 42 Inner bead part 43 Outer bead part 5 Electromagnetic drive part L Axis 10 Lower mold 20 Upper mold 30 Cavity 40 Needle cap

Claims (7)

A structure for fixing the diaphragm to the drive shaft for fixing the diaphragm with the base fabric embedded in the rubber layer to the drive shaft,
As the diaphragm, a diaphragm in which an opening having a diameter matching the diameter of the driving shaft is formed only in the rubber layer at the center is used, and the base cloth of the opening portion of the diaphragm is pierced by the driving shaft. A structure for fixing a diaphragm to a drive shaft, characterized in that a drive shaft is passed through the diaphragm, a fixing member is fixed to the drive shaft, and the diaphragm is fixed to the drive shaft.   The fixing member is a pressing member in which an insertion hole that is inserted into the driving shaft is formed, and an end portion of the driving shaft through which the insertion hole of the pressing member is inserted is caulked, and the pressing member is attached to the driving shaft. The structure for fixing a diaphragm to a drive shaft according to claim 1, wherein the structure is fixed. A method of fixing the diaphragm to the drive shaft for fixing the diaphragm with the base fabric embedded in the rubber layer to the drive shaft,
As the diaphragm, an opening having a diameter matching the diameter of the drive shaft is formed only in the rubber layer at the center, and the diaphragm in which the base fabric is exposed in the opening is used.
A needle cap is detachably attached to the end of the drive shaft,
The needle-shaped cap is pierced with the base cloth in the opening of the diaphragm, the needle-shaped cap and the drive shaft are passed through the diaphragm, the needle-shaped cap is removed, and the needle-shaped cap is removed. A fixing method of a diaphragm to a drive shaft, wherein a fixing member is fixed to the drive shaft. As the fixing member, using a valve body in which an insertion hole for inserting the drive shaft is formed,
4. The method of fixing a diaphragm to a drive shaft according to claim 3, wherein an end of the drive shaft inserted through the insertion hole of the valve body is caulked to fix the valve body to the drive shaft. A diaphragm in which a base fabric is embedded in a rubber layer,
A diaphragm characterized in that an opening is formed only in the rubber layer at the center and the base fabric is exposed in the opening. An electromagnetic control valve in which a valve chamber and a valve port are formed between a first port and a second port, and a valve body in the valve chamber is driven by an electromagnetic drive unit to open and close the valve port. The force acting on the valve body due to the differential pressure between the first port and the second port is offset by the force acting on the valve body due to the differential pressure between the valve chamber and the pressure equalizing chamber applied to the pressure sensing portion. In the electromagnetic control valve that proportionally changes the opening degree of the valve port by balancing the electromagnetic force of the electromagnetic drive unit and the spring force of the adjustment spring,
The electromagnetic drive unit, the adjustment spring, the pressure equalization chamber, and the pressure sensing unit are provided on the opposite side of the valve port from the valve body on the axis of the valve port;
The valve body is fixed to a drive shaft of a connection portion connected to the electromagnetic drive portion,
The pressure-sensitive portion is a diaphragm in which a base fabric is embedded in a rubber layer and is disposed between the valve chamber and the pressure equalizing chamber, and is aligned with the diameter of the drive shaft only in the rubber layer at the center. A diaphragm in which an opening having a diameter is formed;
The base cloth of the opening portion of the diaphragm is pierced by the drive shaft, the drive shaft is penetrated by the diaphragm, the valve body is fixed to the drive shaft, and the diaphragm is fixed to the drive shaft. An electromagnetic control valve characterized by that.   The electromagnetic control valve according to claim 6, wherein a pressure equalizing passage that connects the valve port and the pressure equalizing chamber is formed in the valve body and the connecting portion.

Images