JP4597027B2 - solenoid valve - Google Patents

Description

  The present invention relates to a solenoid valve.

As a general structure of the electromagnetic valve, one described in Patent Document 1 below is known. This is composed of an upper half solenoid valve body and a lower half pipe connection member. The solenoid valve body is provided with a plunger that can move along the axial direction of the coil. The body is fixed. On the other hand, the pipe connection member is formed by casting and cutting processing such as the lost wax method, and a valve seat capable of contacting the valve body is disposed inside, and a port connectable to the pipe is formed. Has been.
JP-A-6-147344

  However, when this is attempted to be thinned for the purpose of weight reduction using the lost wax casting method, the hot water flow becomes worse, the lack of meat occurs, and the manufacture becomes difficult. Therefore, if a thin stainless steel material is used and formed by pressing, the strength will be insufficient, and if the positional relationship between the pipe and the port is shifted, the pipe connection member may be deformed if it is forced to connect to the pipe. There is sex. In this case, the contact pressure between the valve seat and the valve body is not uniform, and the sealing performance may be deteriorated. This invention is completed based on the above situations, Comprising: It aims at enabling sealing performance to be hold | maintained, enabling thinning of a pipe connection member by press work.

As means for achieving the above object, the invention of claim 1 is directed to an electromagnetic valve body having a plunger movable along the axial direction, and a port mounted on the electromagnetic valve body and opened and closed by the plunger. And a valve connecting member that is formed separately from the valve seat member and that can connect a pipe that communicates coaxially with the port, the pipe connecting member Is formed by pressing a metal thin plate material, and the valve seat member is housed in the solenoid valve body and the valve seat member with a compressible packing interposed therebetween. It is characterized in that it is configured to be assembled to the electromagnetic valve body .

  The invention of claim 2 is characterized in that, in the invention of claim 1, another pipe can be connected to the pipe connecting member in a direction substantially perpendicular to the axial direction of the pipe.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the pipe connection member includes a base portion whose inside is a fluid inflow space and a connection portion capable of connecting the pipe. Each of the base portion and the connection portion is characterized in that it is formed by press working and then connected to each other.

  A fourth aspect of the invention is characterized in that the pipe connecting member is made of stainless steel according to any one of the first to third aspects.

<Invention of Claim 1>
According to the first aspect of the present invention, since the pipe connecting member is formed by pressing a metal thin plate material, the pipe connecting member can be made thinner and lighter than when casting. In addition, since the pipe connection member is assembled separately from the valve seat member and the pipe is not directly connected to the port, even if the operation force for pipe connection is received, the port is not deformed or displaced. Therefore, the sealing performance can be maintained. In addition, since the pipe communicating at least with the port opened and closed by the plunger can be connected to the pipe connecting member, the sealing performance can be more effectively maintained.

<Invention of Claim 2>
According to invention of Claim 2, since it can connect to a piping connection member also about other piping, compared with the case where other piping is directly connected with a valve seat member, for connecting other piping It is possible to further restrict that the operating force is transmitted to the port opened and closed by the plunger.

<Invention of Claim 3>
According to the invention of claim 3, since the pipe connecting member is formed by forming the base portion and the connecting portion by press working and then joining them together, the base portion and the connecting portion are integrated. There is no difficulty in manufacturing the formed pipe connecting member by press molding, and it is possible to employ a simple press working, and it is possible to produce at low cost and with stable quality. In addition, by adopting a production method by press working and joining, there is no problem of lack of meat, an improvement in yield can be expected, and it can be made thinner and lighter than the production method by casting and cutting. And there is an advantage that a significant improvement in production capacity can be expected.

<Invention of Claim 4>
According to the invention of claim 4, since the pipe connection member is formed using stainless steel having high corrosion resistance, the electromagnetic valve can be applied to a wide range of uses regardless of the type of fluid.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The electromagnetic valve 1 in the present embodiment is an on-off valve for opening and closing a flow path, and includes an electromagnetic valve main body 2, a valve seat member 20, and a pipe connection member 3, as shown in FIG. The solenoid valve main body 2 includes a bobbin 11 around which a coil 10 is wound, a plunger 12 movable along the axial direction of the bobbin 11 when the coil 10 is energized, and a fixed coaxial arrangement with the plunger 12. It consists of a core 21 and a yoke (consisting of a frame yoke 15 and a plate yoke 16) arranged outside the bobbin 11. The valve seat member 20 includes a valve seat 14 that can open and close the flow path when the valve body 13 attached to the lower end of the plunger 12 is separated and abutted. In the following description, the vertical direction is based on the vertical direction in FIG.

  The frame yoke 15 is made of a magnetic material, has a plate shape, and has a U shape that opens upward. The frame yoke 15 will be described in detail. The frame yoke 15 is composed of a substantially rectangular bottom surface portion and a pair of side surface portions that are bent upward with their opposite side edges as bending edges. A bobbin 11 is disposed inside the frame yoke 15, and a substantially cylindrical valve seat member 20 is disposed below the bobbin 11 via a bottom surface portion of the frame yoke 15. A sleeve 19 and a plunger 12, which will be described later, protrude into the valve seat member 20 so as to penetrate substantially the center of the bottom surface of the frame yoke 15 in the vertical direction. As shown in FIG. 5, a plate yoke 16 made of a magnetic material is disposed above the bobbin 11. The plate yoke 16 is connected to the upper ends of both side surfaces of the frame yoke 15. In addition, as shown in FIG. 4, the upper part of the bobbin 11 is connected with the both ends of the coil | winding which comprises the coil 10, and the connection piece 22 which makes a tab shape is protrudingly provided. The connection piece 22 can be energized to the coil 10 by being connected to an external power source.

  As shown in FIG. 1, a substantially cylindrical sleeve 19 is arranged on the inner peripheral surface of the bobbin 11. A mounting portion 23 for mounting the valve seat member 20 is integrally formed at the lower end of the sleeve 19. The mounting portion 23 is formed by extending the lower end of the sleeve 19 downward from the bottom surface portion of the frame yoke 15 toward the outside in the radial direction and then folding back upward. Furthermore, a pressing surface 24 for the second seal ring 31 to be described later is formed by extending the extending end radially outward along the bottom surface of the frame yoke 15. The valve seat member 20 is pressed into the electromagnetic valve body 2 by press-fitting the valve seat member 20 so that the inner peripheral surface of the expanded portion at the upper end opening edge of the valve seat member 20 is in sliding contact with the outer peripheral surface of the mounting portion 23. It can be installed.

  Inside the sleeve 19, a fixed core 21 and a plunger 12 made of a magnetic material are arranged in order from the top. The upper end side of the fixed core 21 is caulked and fixed to the upper surface of the plate yoke 16, and the plunger 12 is movable along the axial direction of the bobbin 11. The lower end of the fixed core 21 is formed as a recess, and can be brought into contact with the upper end of the plunger 12 so as to be substantially matched. A spring 25 is mounted in a compressed state between the lower end of the fixed core 21 and the upper end of the plunger 12, and always biases the plunger 12 downward. Therefore, in a non-excited state where the coil 10 is not energized, as shown in FIG. 1, the plunger 12 receives the urging force of the spring 25 and is pushed downward to close the outlet port 18 described later with respect to the valve body 13. In the excited state in which the coil 10 is energized, as shown in FIG. 7, the plunger 12 is attracted to the fixed core 21 side with a suction force that overcomes the urging force of the spring 25. In contrast, the outlet port 18 is opened. The upper end side of the sleeve 19 is slightly reduced in diameter and is in close contact with the outer peripheral surface of the fixed core 21. The first seal ring 26 is provided between the sleeve 19 and the fixed core 21 in this close contact portion. Is held in a compressed state, and is sealed from the outside.

  The valve seat member 20 is formed by pressing a stainless steel thin plate material having a substantially cylindrical shape. The bottom surface portion is knocked inward to form a valve seat 14. Further, the upper portion of the valve seat member 20 is expanded and fitted into the mounting portion 23. Further, the side surface portion is punched out into a substantially circular shape, and an introduction port 17 that leads to the upstream side of the flow path is formed therethrough. Further, the above-described valve seat 14 is punched out into a substantially circular shape, and a lead-out port 18 (corresponding to a port in the present invention) that leads to the downstream side of the flow path is formed therethrough. When the solenoid valve main body 2 and the pipe connection member 3 are fixed, the valve seat member 20 has an internal space (hereinafter referred to as a fluid inflow space S) of the base body portion 4 described later of the pipe connection member 3 as shown in FIG. Is to be housed.

  The pipe connecting member 3 is a member for connecting the solenoid valve main body 2 and a pipe (not shown). As shown in FIG. 3, the base part 4 having a fluid inflow space S therein, and the base part 4 It is comprised from a pair of connection parts 5 and 5 connected with piping with the form which protrudes outward from an outer surface. The base body part 4 and both connection parts 5 and 5 are each formed by pressing each of a thin plate material made of stainless steel having a substantially cylindrical shape. Both the connecting portions 5 and 5 are formed with a large diameter portion 5A and a small diameter portion 5B having different diameters along the axial direction. The large-diameter portion 5A can be connected to a pipe, and a protruding portion 33 is formed on the distal end side of the large-diameter portion 5A so as to protrude radially outward. On the other hand, the opening edge portion of the small diameter portion 5B is reduced in diameter and can be press-fitted into the in-side opening 28 of the base portion 4.

  The base portion 4 has a substantially cylindrical shape with a bottom that opens upward, and a flange 27 is formed with its upper end opening edge facing outward in the radial direction. An in-side opening 28 is formed through the side surface of the base portion 4 so as to project outward by burring. The connecting portion 5 is joined to the inner peripheral surface of the protruding portion of the in-side opening 28 by press-fitting the small diameter portion 5B of the connecting portion 5 from the outside and brazing. Similarly, an out-side opening 29 is provided through the lower surface of the base body portion 4 and the connection portion 5 is joined thereto. Between the lower surface of the valve seat member 20 and the inner surface of the pipe connecting member 3, the packing 30 is sandwiched in a compressed state, so that the inside of the valve seat member 20 and a pipe coaxially disposed below the valve seat member 20 are provided. It communicates in a sealed state.

  The flange 27 has three horizontal surfaces with different heights, and is formed as a seal surface 27A, a relief surface 27B, and a fixed surface 27C in this order from the radially inner side. The fixing surface 27 </ b> C is screwed to the bottom surface portion of the frame yoke 15 with a fixing screw 32, so that the pipe connection member 3 can be assembled to the solenoid valve main body 2. When the pipe connection member 3 is attached to the solenoid valve body 2, the second seal ring 31 is sandwiched between the seal surface 27 </ b> A and the pressing surface 24 in a compressed state from above and below, thereby allowing the inside of the valve seat member 20 to And a pipe arranged coaxially on the side thereof are communicated in a sealed state. As a result, the fluid inflow space S becomes a space that can communicate with each pipe, and the flow path can be closed and opened by the valve body 13 contacting and separating from the valve seat 14.

The present embodiment has the above-described structure, and its operation will be described subsequently.
First, processing of the pipe connecting member 3 will be described. The base portion 4 and the connecting portions 5 and 5 are formed by individually pressing a thin plate material made of stainless steel. Thereafter, the small diameter portion 5B side of both connecting portions 5 and 5 is press-fitted inside the in-side opening 28 and the out-side opening 29 of the base portion 4, and is joined by brazing to form a unit. As a result, there is no difficulty in press-molding the pipe connection member 3 in which the base body 4 and the connection portions 5 and 5 are integrally formed, and it is possible to employ a simple press work, which is inexpensive. In addition, stable production in terms of quality is possible, and significant improvement in production capacity can be expected. In addition, when thinning while using the lost wax casting method, where a shortage of meat occurs, the adoption of simple press processing and joining eliminates the occurrence of the shortage of meat itself, so an improvement in yield can be expected. . Furthermore, the pipe connecting member 3 can be significantly reduced in thickness and weight as compared with casting and cutting. In addition, by adopting stainless steel having high corrosion resistance, the solenoid valve 1 can be applied to a wide range of applications regardless of the type of fluid.

  Next, the assembly procedure of the pipe connection member 3 will be described. In assembling the pipe connection member 3 to the solenoid valve body 2, the packing 30 is placed on the inner peripheral surface of the base portion 4 on the outer peripheral edge of the valve seat 14, and the second seal ring 31 is placed on the seal surface 27 </ b> A of the flange 27. Keep it. Thereafter, the pipe connecting member 3 is assembled from below the solenoid valve body 2 and the fixing surface 27C is screwed to the bottom surface of the frame yoke 15 from above using the fixing screw 32, whereby the pipe connecting member 3 is fixed to the solenoid valve body. 2 is attached. Thereby, the packing 30 is clamped between the lower surface of the valve seat member 20 and the inner surface of the pipe connection member 3. Further, the second seal ring 31 is sandwiched between the pressing surface 24 and the seal surface 27C from above and below.

  Subsequently, the pipe connecting member 3 and the pipe are connected. The pipe is connected to the end of the large diameter portion 5 </ b> A of the connection portion 5. Thereby, the fluid inflow space S can communicate with the pipe. The outlet port 18 can be closed when the valve body 13 contacts the valve seat 14, and the outlet port 18 can be opened when the valve body 13 is separated from the valve seat 14.

  By the way, for example, if the positional relationship between the piping and the connecting portion 5 is shifted when connecting to the piping, if the piping and the connecting portion 5 are forcibly connected, the operation for the piping connecting member 3 to connect the piping is performed. Even if it is deformed by receiving force, the valve seat member 20 is not deformed, and the sealing performance is not deteriorated. If the pipe is directly connected to the ports 17 and 18 of the valve seat member 20, the valve seat member 20 is deformed, and the contact pressure between the valve body 13 and the valve seat 14 is uneven. As a result, the sealing performance may be reduced. In that respect, in this embodiment, the pipe connection member 3 is assembled separately from the valve seat member 20, and the pipe is directly connected to the pipe connection member 3, so that the sealing performance can be maintained. Furthermore, since the pipe connected to the introduction port 17 is also connected to the pipe connection member 3, the sealing state of the outlet port 18 is not affected. As a result, the sealing performance at the outlet port 18 can be maintained.

  As described above, in the present embodiment, since the pipe connecting member 3 is assembled separately from the valve seat member 20 and the pipe is not directly connected to the outlet port 18, the operation force for connecting the pipe is received. Even so, since the lead-out port 18 does not have to be deformed or displaced, the sealing performance can be maintained. In addition, since it is possible to connect the pipe connecting to the pipe connecting member 3 at least with the outlet port 18 opened and closed by the plunger 12, the sealing performance can be more effectively maintained. Further, since the pipe communicating coaxially with the introduction port 17 can also be connected to the pipe connecting member 3, the operation for connecting this pipe compared to the case where this pipe is directly connected to the valve seat member 20. It is possible to further restrict the transmission of force to the outlet port 18. Furthermore, there is no difficulty in manufacturing the pipe connection member 3 in which the base body portion 4 and the both connection portions 5 and 5 are integrally formed by press molding, and it is possible to employ a simple press work, which is inexpensive and Stable production is possible in terms of quality. In addition, by adopting a production method by press working and joining, there is no problem of lack of meat, an improvement in yield can be expected, and it can be made thinner and lighter than the production method by casting and cutting. And there is an advantage that a significant improvement in production capacity can be expected. In addition to these, since the pipe connection member 3 is formed using stainless steel having high corrosion resistance, the electromagnetic valve 1 can be applied to a wide range of uses regardless of the type of fluid.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the present embodiment, the pipe connection member is illustrated with one connection portion joined to each of the side surface and the bottom surface, but the number of pipes should not be limited.

  (2) In the present embodiment, the pipe connecting member is fixed to the bottom surface portion of the frame yoke. However, according to the present invention, the pipe connecting member may be assembled to the solenoid valve body and assembled to the bobbin. You may do it.

  (3) In the present embodiment, the inside of the base portion is exemplified as a fluid inflow space. However, according to the present invention, it is sufficient that the pipe communicates with the port, and the inside of the valve seat member is fluid. It may be an inflow space.

  (4) In the present embodiment, a method using brazing is illustrated as a bonding method, but according to the present invention, the bonding method is not limited, and other bonding methods may be used.

Sectional drawing of the solenoid valve at the time of valve closing in Embodiment 1 Sectional view of the solenoid valve showing the state where the pipe connecting member is removed Sectional drawing which shows the state before joining of the piping connection member Front view of the solenoid valve Side view of the solenoid valve Plan view of the solenoid valve Cross section of the solenoid valve when the valve is open

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Solenoid valve 2 ... Solenoid valve main body 3 ... Piping connection member 4 ... Base part 5 ... Connection part 12 ... Plunger 18 ... Derivation port (port)
20 ... Valve seat member S ... Fluid inflow space

Claims (4)

A solenoid valve body having a plunger movable along the axial direction;
A valve seat member having a port mounted on the electromagnetic valve body and opened and closed by the plunger;
A solenoid valve provided with a pipe connection member formed separately from the valve seat member and capable of connecting a pipe coaxially communicating with the port,
The pipe connecting member is
In a state in which the valve seat member is accommodated inside the metal valve plate and the valve seat member while being formed by pressing a metal thin plate material and interposing a compressible packing for the solenoid valve body and the valve seat member, respectively. A solenoid valve that is assembled to the solenoid valve body .   2. The solenoid valve according to claim 1, wherein another pipe can be connected to the pipe connecting member in a direction substantially orthogonal to the axial direction of the pipe. The pipe connecting member is composed of a base part whose inside is a fluid inflow space, and a connecting part that allows the pipe to be connected, and each of the base part and the connecting part is formed by pressing, 3. The solenoid valve according to claim 1, wherein the solenoid valves are connected to each other. The solenoid valve according to any one of claims 1 to 3 , wherein the pipe connecting member is made of stainless steel.

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