JP4437518B2 - Valve structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve structure in which a valve body is brought into contact with or separated from a valve seat.
[0002]
[Prior art]
Conventionally, as a valve structure, for example, there is a direct acting three-port solenoid valve 100 as shown in FIG. This solenoid valve 100 has three ports, a COM port 101, an NC port 102, and a NO port 103, and a plunger 106 in which the first valve body 104 and the second valve body 105 are assembled together is connected to the coil 107. The flow path is switched by being attracted and separated from the core 108 by energization / stop. The second valve body 105 is brought into contact with and separated from the second valve seat 109 to open and close the flow path between the COM port 101 and the NO port 103.
[0003]
Here, as shown in an enlarged view in FIG. 12, the second valve body 105 has a contact surface 105a that contacts the second valve seat 109, and a step portion 105b is formed around the contact surface 105a. A convex portion 105c is provided on the back surface opposite to the contact surface 105a. And the valve body case 110 in which the 2nd valve body 105 is integrated is connected with the plunger 106 via a pair of rod part 110a (only one is shown in FIG. 11, FIG. 12). Moreover, the back cover 111 which comprises the valve body case 110 has the penetration hole 111a in which the convex part 105c of the 2nd valve body 105 penetrates. And the 2nd valve body 105 is integrated in the valve body case 110 so that it may be pinched | interposed into the spacer 112 integrated in the step part 105b, and the back cover 111. FIG.
[0004]
As shown in FIG. 11, in a state where the coil 107 is not energized, the restoring force of the spring 113 exceeds the restoring force of the spring 114, so that the plunger 106 and the valve body case 110 are pushed down in the drawing, and the second valve body 105 Is separated from the second valve seat 109. On the other hand, when the coil 107 is energized, the plunger 106 is attracted to the core 108 and moves upward in the figure against the restoring force of the spring 113. Accordingly, the valve body case 110 also moves together with the plunger 106, and the second valve body 105 is pulled upward in the drawing, so that it contacts the second valve seat 109. At this time, the spring 114 supports the valve body case 110 from below in the figure, so that the second valve body 105 comes into contact with the second valve seat 109.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional valve structure described above, when the second valve body 105 is brought into contact with the second valve seat 109 and the flow path is closed, the second valve seat 109 is secured in order to ensure the hermeticity. It is desirable that the entire circumference of the seat surface of the seat 109 and the contact surface 105a of the second valve body 105 abut on each other. However, in practice, it may be difficult to obtain the uniformity of contact due to errors in forming parts, errors in assembly, and the like. In addition, since the force with which the spring 114 presses the valve body case 110 is limited, the contact surface 105a of the second valve body 105 is brought into close contact with the entire circumference of the seat surface of the second valve seat 109 only by the force of the spring 114. It is also difficult. Therefore, when the second valve body 105 is brought into contact with the second valve seat 109, there is a possibility that a slight gap may be generated between the two 105 and 109, and there is a possibility that fluid leaks from the gap. . In particular, with this valve structure, there is a tendency that a gap is likely to occur when a low-pressure fluid is handled.
[0006]
The present invention has been made in view of the above circumstances. The purpose of the present invention is to provide a valve body with the entire circumference of the seat surface of the valve seat, even if there is an error during assembly of the valve body case and the valve seat. It is intended to provide a valve structure that is brought into close contact with each other to prevent fluid leakage.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 includes a valve seat, a valve body, and a valve body case, and the valve body includes the valve seat and an opening portion of the valve body case. It is incorporated in the valve body case so that the contact surface of the valve body is exposed, and by moving the valve body case, the contact surface of the valve body is brought into contact with and separated from the valve seat so as to open and close. In the valve structure, the valve body case has a flange portion on the contact surface side of the valve body, a claw portion is formed on the opposite side, and the valve body has the flange portion on the contact surface side. A step part that contacts , a convex part on the back side opposite to the contact surface, the valve body is inserted into the valve body case, and a back cover serving as a bottom surface of the valve body case is attached to the claw part to be fitted, that the tip of the convex portion comes into contact with the back cover, and a gap is formed between the back surface and the back cover of the valve body, The serial valve body the valve body case, and supported the spirit that to be covered with the exception of the contact surface.
[0008]
According to said structure, a valve body is moved by moving a valve body case. Here, since the valve body has a convex portion on the back surface opposite to the contact surface, and the tip of the convex portion is in contact with the bottom surface of the valve body case, the back surface portion other than the convex portion is the valve body case. And a gap is formed between the bottom surface of the valve body case. This clearance allows the deformation of the valve body itself. Therefore, when the contact surface of the valve body comes into contact with the valve seat by the movement of the valve body case, the contact surface of the valve body follows the valve seat due to the deformation of the valve body, and the entire circumference of the seat surface. Will abut.
[0009]
In order to achieve the above object, according to a second aspect of the present invention, in the valve structure according to the first aspect, the valve body has a substantially disc shape, and one convex portion is provided at the center of the back surface. It is provided that the seat surface of the valve seat has a substantially annular shape.
[0010]
According to the configuration of the above invention, in addition to the operation of the invention of claim 1, since one convex portion is provided at the central portion of the back surface, the entire valve body can be deformed in any direction around the convex portion. It becomes. Here, errors during assembly, etc. that occur between the valve body and the valve seat mainly cause an inclination between the contact surface of the valve body and the entire seat surface of the valve seat. By tilting the whole in any direction, the contact surface of the valve body can be adjusted to the same angle as the entire circumference of the seat surface of the valve seat.
[0011]
In order to achieve the above-mentioned object, the invention according to claim 3 includes a valve seat, a valve body, and a valve body case, and the valve body is formed from the opening of the valve body case and the valve seat. It is incorporated in the valve body case so that the contact surface of the valve body is exposed, and by moving the valve body case, the contact surface of the valve body is brought into contact with and separated from the valve seat so as to open and close. In the valve structure, the valve body case has a flange portion on the contact surface side of the valve body, a claw portion is formed on the opposite side, and the valve body has the flange portion on the contact surface side. The valve body has a stepped portion, the back surface opposite to the contact surface has a taper that converges in a convex shape toward the center, the valve body is inserted into the valve body case, and the bottom surface of the valve body case the back cover to be is fitted to the pawl portion, at the distal end portion of the taper is brought into contact with the back cover, of the valve body Forming a gap between the surface and the back cover, the valve body the valve body case, and supported the spirit that to be covered with the exception of the contact surface.
[0012]
According to the structure of the said invention, a valve body is moved by moving a valve body case. Here, the valve body has a taper in which the back surface opposite to the contact surface converges in a convex shape toward the center, and the tip of the taper is in contact with the bottom surface of the valve body case. The back surface portion other than the tip portion does not directly contact the valve body case, and a gap is generated between the bottom surface of the valve body case. This clearance allows the deformation of the valve body itself. Therefore, when the contact surface of the valve body comes into contact with the valve seat by the movement of the valve body case, the contact surface of the valve body follows the valve seat due to the deformation of the valve body, and the entire circumference of the seat surface. Will abut.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment embodying a valve structure of the present invention will be described in detail with reference to the drawings.
[0014]
FIG. 1 is a sectional view of a solenoid valve 1 embodying the present invention, and FIG. 2 is a plan view of the solenoid valve 1. 3 and 4 are cross-sectional views taken along line AA of FIGS. 1 and 2, respectively, showing a non-energized state and an energized state, respectively. This solenoid valve 1 has the same basic configuration as the direct acting three-port solenoid valve 100 described in the section of the prior art.
[0015]
As shown in FIGS. 1 and 3, the electromagnetic valve 1 of the present embodiment is provided with a COM port 11, an NC port 12, and a NO port 13 in a body 10. A first valve seat 14 and a second valve seat 15 are integrally formed on the body 10. Each of the valve seats 14 and 15 is provided with a first valve body 16 and a second valve body 17 made of rubber so as to be in contact with or separated from each other. The 1st valve body 16 is assembled | attached to the plunger 18, and the 2nd valve body 17 is integrated in the valve body case 19 connected with the plunger 18 via the rod 19a. The solenoid valve 1 is provided with a core 20 for attracting the plunger 18 and a coil 21 for exciting the core 20.
[0016]
The plunger 18 is provided with a first spring 22 for pushing down the valve body case 19 downward in the drawing. The valve body case 19 is provided with a second spring 23 for pushing the case 19 upward in the drawing. As shown in FIGS. 1 and 2, various pipe joints 30, 31, and 32 are respectively attached to the ports 11 to 13, and the ports 11 to 13 are connected to other devices. Yes.
[0017]
Here, as shown in the enlarged view of FIG. 5, the second valve element 17 includes a contact surface 17 a that contacts the second valve seat 15, and a stepped portion 17 b is provided around the contact surface 17 a. The second valve body 17 includes a convex portion 17d at the center of the back surface 17c opposite to the contact surface 17a. In this embodiment, the thickness of the second valve body 17 is “4.6 mm”, for example, and the height of the convex portion 17 d is set to “0.25 mm”, for example. The valve body case 19 includes a back cover 25 fitted on the bottom side thereof. The step 17b of the second valve element 17 is locked to the flange 19b of the valve element case 19 via the spacer 24. In this state, the tip of the convex part 17d of the second valve element 17 is the back cover. 25 is in contact with the bottom surface 25a. By assembling in this way, the second valve body 17 is such that only the tip of the convex portion 17d is in contact with the bottom surface 25a of the back cover 25, and the back surface 17c and back cover of the second valve body 17 other than the convex portion 17d. There is a slight gap between the bottom surface 25a of 25. In this assembled state, the contact surface 17 a of the second valve body 17 is exposed from the opening 19 c of the valve body case 19.
[0018]
Next, the operation of the electromagnetic valve 1 configured as described above will be described. First, as shown in FIGS. 1 and 3, in a state where the coil 21 is not energized, the plunger 18 is pushed downward in the drawing by the restoring force of the first spring 22, and the first valve body 16 is moved to the first valve. While abutting on the seat 14, the second valve element 17 is separated from the second valve seat 15. This is because the restoring force of the first spring 22 exceeds the restoring force of the second spring 23. Here, when the coil 21 is energized, as shown in FIG. 4, the plunger 18 moves upward in the figure against the restoring force of the first spring 22 by the adsorption force of the core 20. Accordingly, the first valve body 16 is separated from the first valve seat 14, and the second valve body 17 is in contact with the second valve seat 15.
[0019]
This electromagnetic valve 1 is used for an oxygen generator, for example. In that case, first, at the time of non-energization, as shown in FIG. 1, the 1st valve seat 14 is closed and the 2nd valve seat 15 is open. That is, the COM port 11 and the NO port 13 are in communication. When the coil 21 is energized for switching the electromagnetic valve 1, the first valve seat 14 is opened and the second valve seat 15 is closed. As a result, the COM port 11 and the NC port 12 communicate with each other, and pressurized air flows from the NC port 12 to the COM port 11. When the energization of the coil 21 is stopped again, the COM port 11 and the NO port 13 communicate with each other, and air flows from the COM port 11 to the NO port 13.
[0020]
Here, a slight inclination may exist between the contact surface 17a of the second valve body 17 and the entire circumference of the seat surface of the second valve seat 15 due to the molding accuracy of the body 10 or an assembly error. . In the conventional valve structure of the solenoid valve 100, if the inclination is slight, the contact surface 105a is in close contact with the entire circumference of the seat surface of the second valve seat 109 due to the flexibility of the second valve body 105, and the fluid There was no leakage. However, there has been a problem that fluid leakage occurs when a very large inclination occurs.
[0021]
On the other hand, in the valve structure of the electromagnetic valve 1 of this embodiment, a gap is provided between the periphery of the convex portion 17d of the second valve body 17 and the bottom surface 25a of the back cover 25, as shown in FIG. In addition, the second valve body 17 is inclined in any direction around the convex portion 17d. Thereby, the contact surface 17 a of the second valve body 17 can follow the inclination of the entire circumference of the seat surface of the second valve seat 15. That is, the second valve body 17 is allowed to be deformed with the convex portion 17d as an axis due to its own flexibility, and the inclination of the contact surface 17a is changed. In FIG. 6, the inclination between the contact surface 17 a of the second valve body 17 and the entire circumference of the seat surface of the second valve seat 15 is indicated by θ.
[0022]
Here, an experimental result of evaluating the limit seal pressure value by the valve structure of the electromagnetic valve 1 of the present embodiment is shown in FIG. 7 in comparison with the valve structure of the conventional electromagnetic valve 100. Here, the NC port 11 is closed by plugging the pipe joint 30, the coil 21 of the solenoid valve 1 is energized, the second valve seat 15 is closed, and the COM port 11 and the NC port 12 are in communication with each other. The pressure until the fluid leaked to the COM port 11 was measured as the limit seal pressure. A similar experiment was performed on a conventional valve structure. The left graph of FIG. 7 is based on the conventional valve structure, and the right graph is based on the valve structure of the present embodiment. The shaded portion of each graph indicates the range of measurement values including errors. In the conventional valve structure, the limit seal pressure value was 0.1 MPa to 0.65 MPa, whereas in the valve structure of the present embodiment, the limit seal pressure value was 0.65 MPa to 0.84 MPa. . From this result, it can be seen that, compared with the conventional valve structure, in the valve structure of the present embodiment, the seal performance is greatly improved and the variation in measured values is reduced.
[0023]
As described above, according to the valve structure of the electromagnetic valve 1 of this embodiment, the second valve body 17 is incorporated in the valve body case 19, and the second valve body 17 is moved by moving the valve body case 19. Is done.
[0024]
Here, the second valve body 17 has a convex portion 17d on the back surface 17c opposite to the contact surface 17a, and the tip of the convex portion 17d is in contact with the bottom surface 25a of the back cover 25. The back surface 17c other than the portion 17d does not directly contact the back cover 25, and a gap is generated between the back surface 17c and the bottom surface 25a. Due to this gap, the deformation of the second valve body 17 itself is allowed. Therefore, when the contact surface 17a of the second valve body 17 contacts the second valve seat 15 due to the movement of the valve body case 19, the contact of the second valve body 17 due to the deformation of the second valve body 17 occurs. The surface 17a follows the second valve seat 15 and comes into contact with the entire circumference of the seat surface. As a result, the contact surface 17a of the second valve body 17 can be brought into close contact with the entire circumference of the seat surface of the second valve seat 15, thereby preventing fluid leakage between the both 15 and 17.
[0025]
Furthermore, according to the valve structure of the electromagnetic valve 1 of this embodiment, since one convex portion 17d is provided at the central portion of the back surface 17c, the entire second valve body 17 is centered on the convex portion 17d. It can also be deformed in the direction. Here, the error during assembly or the like that occurs between the second valve body 17 and the second valve seat 15 is mainly caused by the contact surface 17a of the second valve body 17 and the entire seat surface of the second valve seat 15. Since the second valve element 17 as a whole is inclined in any direction, the contact surface 17a of the second valve element 17 is the same as the entire circumference of the seat surface of the second valve seat 15. Can be adjusted to the angle. As a result, the contact surface 17a of the second valve body 17 is changed to the seat surface of the second valve seat 15 regardless of the position of the error such as when the second valve body 17 and the second valve seat 15 are assembled. The entire circumference can be more securely adhered, and thereby fluid leakage between the both 15 and 17 can be more reliably prevented.
[0026]
In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can change suitably.
[0027]
(1) In the above embodiment, as shown in FIG. 5, the convex portion 17d is provided on the back surface 17c on the opposite side of the contact surface 17a of the second valve body 17, and the tip of the convex portion 17d is formed at the valve body case 19. The back surface 17c of the second valve body 17 is supported by the valve body case 19 by being brought into contact with the bottom surface 25a. On the other hand, as shown in FIG. 8, the back surface 17c opposite to the contact surface 17a of the second valve body 17 is formed into a taper 30 that converges in a convex shape toward the center, and the tip of the taper 30 You may comprise so that the back surface 17c of the 2nd valve body 17 may be supported by the valve body case 19 by making 30a contact | abut to the bottom face 25a of the valve body case 19. FIG. Also with this configuration, the same operations and effects as in the above embodiment can be obtained.
[0028]
(2) In the above embodiment, the tip of the convex portion 17d of the second valve element 17 is configured to be a flat surface. On the other hand, as shown in FIG. 9, the tip surface of the convex portion 17d is formed into a taper 31 that converges in a convex shape toward the center, and the tip point 31a of the taper 31 is made to contact the bottom surface 25a of the valve body case. You may comprise so that the back surface 17c of the 2nd valve body 17 may be supported by a valve body case by making it contact. Also with this configuration, the same operations and effects as in the above embodiment can be obtained.
[0029]
(3) In another embodiment of the above (1), the tip end point 30a of the taper 30 on the back surface 17c of the second valve body 17 is brought into contact with the bottom surface 25a of the valve body case 19 so that the second valve body 17 The back surface 17 c is supported by the valve body case 19. On the other hand, as shown in FIG. 10, the back surface 17c of the 2nd valve body 17 is made by making the front-end | tip part of the taper 30 of the back surface 17c into the flat surface 30b, and making the flat surface 30b contact | abut to the bottom face 25a of a valve body case. May be supported by the valve body case. Also with this configuration, the same operations and effects as in the above embodiment can be obtained.
[0030]
(4) Although the valve structure of the present invention is embodied in the three-way valve type electromagnetic valve 1 in the above embodiment, the present invention can be applied not only to the electromagnetic valve 1 but also to other electromagnetic valves. Moreover, the moving method of the 2nd valve body 17 and the valve body case 19 is not restricted to an electromagnetic type.
[0031]
【The invention's effect】
According to the configuration of the first aspect of the present invention, even if there is an error during assembly between the valve body case and the valve seat, the contact surface of the valve body becomes the valve seat by the movement of the valve body case. When the contact is made, the contact surface of the valve body follows the valve seat due to deformation of the valve body and contacts the entire circumference of the seat surface. Thereby, the contact surface of a valve body can be stuck to the perimeter of the seat surface of a valve seat, and the effect that the leakage of the fluid between a valve body and a valve seat can be prevented is exhibited.
[0032]
According to the configuration of the invention described in claim 2, in addition to the effect of the invention described in claim 1, the entire valve body tilts in any direction around the convex portion, and the contact surface of the valve body Is adjusted to the same angle as the entire circumference of the seat surface of the valve seat. As a result, the contact surface of the valve body can be more securely adhered to the entire circumference of the seat surface of the valve seat, and the fluid leakage between the valve body and the valve seat can be more reliably prevented. Demonstrate.
[0033]
According to the configuration of the invention described in claim 3, even if there is an error during assembly between the valve body case and the valve seat, the contact surface of the valve body becomes the valve seat by the movement of the valve body case. When the contact is made, the contact surface of the valve body follows the valve seat due to deformation of the valve body and contacts the entire circumference of the seat surface. Thereby, the contact surface of a valve body can be stuck to the perimeter of the seat surface of a valve seat, and the effect that the leakage of the fluid between a valve body and a valve seat can be prevented is exhibited.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a solenoid valve according to one embodiment.
FIG. 2 is a plan view showing a solenoid valve, similarly;
3 is a cross-sectional view taken along the line AA in FIG. 1 and FIG.
4 is a cross-sectional view taken along the line AA when energized in FIGS. 1 and 2. FIG.
FIG. 5 is an enlarged cross-sectional view of a second valve body and a valve body case, similarly.
FIG. 6 is an enlarged cross-sectional view when the second valve body contacts the second valve seat, similarly.
FIG. 7 is also a graph showing the measurement result of the limit seal pressure value by the valve structure.
FIG. 8 is an enlarged cross-sectional view of a second valve body and a valve body case according to another embodiment.
FIG. 9 is an enlarged sectional view of a second valve body according to another embodiment.
FIG. 10 is an enlarged cross-sectional view of a second valve body according to another embodiment.
FIG. 11 is a cross-sectional view showing a conventional solenoid valve.
FIG. 12 is an enlarged cross-sectional view of a second valve body of a conventional solenoid valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solenoid valve 15 2nd valve seat 17 2nd valve body 17a Contact surface 17c Back surface 17d Convex part 19 Valve body case 25 Back cover 25a Bottom

Claims (3)

A valve seat, a valve body, and a valve body case, wherein the valve body is incorporated in the valve body case so that a contact surface with the valve seat is exposed from an opening of the valve body case, In the valve structure that opens and closes by moving the valve body case so that the contact surface of the valve body contacts and separates from the valve seat,
The valve body case has a flange portion on the contact surface side of the valve body, and a claw portion is formed on the opposite side,
The valve body has a step portion that contacts the flange portion on the contact surface side, and has a convex portion on the back surface opposite to the contact surface,
The valve body is inserted into the valve body casing, a back lid comprising a bottom surface of the valve body casing is fitted to the pawl portion, at the tip of the convex portion comes into contact with the back cover, the valve body A valve structure characterized in that a gap is formed between the back surface of the valve body and the back cover, and the valve body is supported so as to be included in the valve body case except for the contact surface .   2. The valve body according to claim 1, wherein the valve body has a substantially disk shape, one convex portion is provided at a central portion of the back surface, and a seating surface of the valve seat has a substantially annular shape. The valve structure described. A valve seat, a valve body, and a valve body case, wherein the valve body is incorporated in the valve body case so that a contact surface with the valve seat is exposed from an opening of the valve body case, In the valve structure that opens and closes by moving the valve body case so that the contact surface of the valve body contacts and separates from the valve seat,
The valve body case has a flange portion on the contact surface side of the valve body, and a claw portion is formed on the opposite side,
The valve body has a stepped portion that comes into contact with the flange portion on the contact surface side, and a back surface opposite to the contact surface has a taper that converges in a convex shape toward the center,
The valve body is inserted into the valve body casing, a back lid comprising a bottom surface of the valve body casing is fitted to the pawl portion, at the distal end portion of the taper is brought into contact with the back cover, the valve body A valve structure characterized in that a gap is formed between the back surface of the valve body and the back cover, and the valve body is supported so as to be included in the valve body case except for the contact surface .

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