JP2020029883A - Fluid control valve - Google Patents

Abstract

To provide a fluid control valve suppressed in positional deviation of a main valve member due to side slip of a spring member.SOLUTION: A fluid control valve 1 includes a main valve member 2 capable of being kept into contact with and separated from a valve seat 13 disposed around an opening portion 12 of a communication hole 11, and switching opening/closing of a flow channel of a fluid between two ports 10a, 11a by closing the opening portion 12 in contact and opening the opening portion 12 in separation, a spring member 4 of which a length is variable in contact of the main valve member 2 with the valve seat 13, and an intermediate member 5 connected with the spring member 4, kept into contact with the main valve member 2, and moved in accompany with movement between contact and separation of the main valve member 2 to the valve seat 13 while transmitting energization force of the sprig member 4 to the main valve member 2. One of the main valve member 2 and the intermediate member 5 has a projecting portion 18 on a surface facing the other member side, the other member has a flat contact surface 16 brought into contact with the projecting portion 18, and the intermediate member 5 is brought into contact with the main valve member 2 at the projecting portion 18 in a manner that the projecting portion 18 is relatively movable along the contact surface 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid control valve that controls the movement of a fluid by opening and closing a fluid flow path in accordance with the pressure of the fluid using the urging force of a spring member.

  2. Description of the Related Art A fluid control valve that controls the movement of a fluid by opening and closing a flow path according to the pressure of the fluid using the urging force of a spring member has been conventionally known. There are various types of fluid control valves having different applications and functions. For example, a relief valve (safety valve) for preventing the pressure of the fluid from rising more than necessary and a pressure reducing valve for keeping the pressure of the fluid after depressurization constant are one of various valves included in such a fluid control valve. It is.

  Such a fluid control valve has a main valve member that can be brought into contact with and separated from a valve seat provided around the opening of the communication hole, and a main valve member that extends in the direction of the contact and separation and has a length in the extending direction. A spring member for applying a corresponding urging force to the main valve member. Here, the length in the extending direction of the spring member when the main valve member is in contact with the valve seat is variable by a user's adjustment operation, and the user can attach the spring member when the main valve member is in contact with the valve seat. The power can be set arbitrarily. When the main valve member is in contact with the valve seat, the fluid is divided into two spaces by closing the opening, and one of the two spaces is the fluid to be pressure-controlled. Is the space to which When the pressure of the fluid in this space increases or decreases to or above a threshold level corresponding to the biasing force of the set spring member, the force for separating the main valve member from the valve seat increases the force for making contact. More dominant. As a result, the main valve member is separated from the valve seat, the fluid moves between the two spaces through the opening, and the pressure of the fluid whose pressure has increased or decreased above the above-described threshold level is moderate. It changes toward a new level of pressure. With such a change in the pressure of the fluid, the force for bringing the main valve member into contact with the valve seat becomes dominant over the force for separating the main valve member. Abuts against the valve seat and the fluid is again divided into two spaces.

  In such a fluid control valve, a form is adopted in which the spring member and the main valve member are directly connected, or indirectly connected with a member connected to both members interposed therebetween. (See, for example, the relationship between the spring 32S, the shaft portion 32, and the diaphragm 20 in Patent Document 1). Some fluid control valves adopt a form in which the urging force of a spring member is transmitted to the main valve member via a member that is fitted to the main valve member but is not fixedly coupled. There is also a valve (see, for example, the relationship between the pressure regulating spring 35, the diaphragm 25, the stem 41, and the valve body 21 in Patent Document 2). In any of these modes, the main valve member moves following the movement of the spring member.

JP-A-2006-151293 JP 2009-26050 A

  Generally, when adjusting the length of the spring member at the time of contact of the main valve member, if the urging force of the spring member is set to a large value by reducing the length of the spring member, the direction of contact and separation of the main valve member In this case, the spring member flexes in the vertical lateral direction, so that the skid easily occurs. In the mode in which the main valve member moves following the movement of the spring member as in the above-described embodiment, when the spring member causes a side slip, the main valve member is likely to be displaced in the lateral direction following the side slip. If the main valve member is misaligned in the lateral direction, the opening will not be completely closed by the main valve member, and the movement of the fluid will be uncontrollable. obtain. Here, in the fluid control valve, the main valve member receives the urging force of the spring member to close the opening, and the membrane portion formed around the main valve body and formed of a thin elastic member. A so-called diaphragm type fluid control valve having the following is known. The diaphragm type fluid control valve has an advantage that the main valve body can be flexibly contacted and separated while maintaining the airtightness of the fluid due to the presence of the membrane portion. There is a characteristic that it can easily follow the movement of the member. For this reason, in the case of the diaphragm type fluid control valve, the above-mentioned problem tends to be particularly serious.

  In view of the above circumstances, an object of the present invention is to provide a fluid control valve that suppresses a displacement of a main valve member due to a side slip of a spring member.

In order to solve the above problems, the present invention provides the following fluid control valve.
[1] A first port and a second port through which a fluid flows in and out, a communication hole communicating with the first port and having an opening separately from the first port, and a communication port with the second port. A space that communicates with the communication hole through a portion, a housing having a valve seat around the opening, and a contact / separation with the valve seat are possible; A main valve member for switching between closing and opening a fluid flow path between the first port and the second port by closing the opening at the time of contact and opening the opening at the time of separation from the valve seat; A spring member that extends in a direction in which the main valve member comes into contact with or separates from a seat and applies an urging force to the main valve member in accordance with the length of the extending direction, wherein the main valve member is attached to the valve seat. The length in the extending direction when in contact can be adjusted by the user's adjustment operation. A strange spring member, which is connected to the spring member and abuts on the main valve member, and transmits the urging force of the spring member to the main valve member while contacting and separating the main valve member with the valve seat. An intermediate member that moves in accordance with the movement, the intermediate member having a convex portion protruding toward the main valve member side on a surface facing the main valve member side, One of the intermediate members has a protrusion protruding toward the other member on a surface facing the other member, and the other member contacts the protrusion. The intermediate member has a flat contact surface in contact therewith, and the intermediate member comes into contact with the main valve member at the protrusion in such a manner that the protrusion is relatively movable along the contact surface. Fluid control valve Fluid control valve.

  Here, the “mode in which the protrusion is relatively movable along the contact surface” refers to a mode in which the protrusion is movable along the contact surface while contacting the almost stationary contact surface. Refers to a mode in which the contact surface is movable along a plane where the contact surface is widening while contacting the substantially stationary convex portion. In addition, the above-mentioned “flat contact surface” has, in addition to a horizontal surface having no unevenness, a contact surface having a gently curved surface such that the protrusion can relatively move on the contact surface relatively sufficiently. Surfaces are also included.

[2] The one member is the intermediate member, the other member is the main valve member, and the intermediate member has one surface connected to the spring member and the other surface connected to the main valve member. It has a plate-shaped intermediate member main body facing the contact surface, and on the other surface, a convex portion whose tip end surface is a rounded curved surface is formed as the convex portion. The fluid control valve according to [1].

[3] The intermediate member main body has a concave portion on the other surface, and has a thickness longer than a depth of the concave portion, and a tip surface in the thickness direction has a rounded curved surface. The fluid control valve according to [2], wherein the convex portion is formed by fitting a member into the concave portion with the side opposite to the distal end face facing the bottom of the concave portion.

[4] The fluid control valve according to [3], wherein the curved member is a spherical member having a diameter longer than the depth of the concave portion.

[5] The fluid control according to [3] or [4], wherein the curved member is made of a metal material having a Vickers hardness specified by JIS Z 2244 larger than a material forming the intermediate member main body. valve.

[6] The main valve member has the contact surface and is in contact with the valve seat to close the opening, and a thin-film-like elastic member disposed around the main valve body. The fluid control valve according to any one of [1] to [5], further comprising a diaphragm comprising: a membrane portion having an outer peripheral end fixed to the housing.

  According to the present invention, even when the spring member bends in the lateral direction perpendicular to the direction of contact and separation of the main valve member to cause a side slip and the intermediate member moves following the side slip, the convex portion contacts the contact surface. Since the main valve member moves relatively on the contact surface while in contact with the main member, the main valve member itself does not easily follow the side slip of the spring member. For this reason, in the fluid control valve of the present invention, the displacement of the main valve member due to the side slip of the spring member is suppressed.

It is a typical sectional view of the fluid control valve which is one embodiment of the fluid control valve of the present invention. It is a typical sectional view of a fluid control valve which is one embodiment of the present invention where a main valve member has a convex part and an intermediate member has a contact surface.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It is to be noted that the present invention is not limited to the following embodiments, and it is understood that design changes, improvements, etc. may be appropriately made based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be.

  FIG. 1 is a schematic sectional view of a fluid control valve 1 which is one embodiment of the fluid control valve of the present invention.

  The fluid control valve 1 shown in FIG. 1 is a relief valve (safety valve) that prevents the pressure of the fluid from rising more than necessary, and opens and closes a flow path according to the pressure of the fluid by using the urging force of a spring member. This is a specific example of the fluid control valve that controls the movement of the fluid.

  The fluid control valve 1 includes a housing 3, and the housing 3 has two ports, a first port 11a and a second port 10a, through which fluid flows in and out. The housing 3 has a communication hole 11 communicating with the first port 11a and having an opening 12 separately from the first port 11a, and a communication hole 11 communicating with the second port 10a and through the opening 12. A space 10 communicating with the space is also formed. Further, the housing 3 has a valve seat 13 around the opening 12 in the space 10.

  The fluid control valve 1 has a main valve member 2. The main valve member 2 can contact and separate from the valve seat 13. The main valve member 2 closes the opening 12 when the main valve member 2 contacts the valve seat 13, and opens the opening 12 when separating from the valve seat 13. It plays the role of switching between closing and opening the fluid flow path between the second port 10a.

  Further, the fluid control valve 1 includes a spring member 4 extending in a direction in which the main valve member 2 contacts and separates from the valve seat 13 and applying an urging force to the main valve member 2 according to the length in the extending direction. ing. The spring member 4 is a spring member whose length in the extending direction when the main valve member 2 is in contact with the valve seat 13 is variable by a user's adjustment operation. A mechanism for adjusting the length of the spring member 4 in the extending direction in response to a user's adjustment operation will be described later in detail.

  Further, the fluid control valve 1 includes an intermediate member 5, and the intermediate member 5 is connected to the spring member 4. The intermediate member 5 is in contact with the main valve member 2, and moves following the movement of the main valve member 2 in contact with or separated from the valve seat 13 while transmitting the urging force of the spring member 4 to the main valve member 2. I do.

  Here, the intermediate member 5 has a convex portion 18 protruding toward the main valve member 2 on a surface facing the main valve member 2 side. It has a flat abutment surface 16 that abuts on 18. The intermediate member 5 is in contact with the main valve member 2 at the protrusion 18 in such a manner that the protrusion 18 is relatively movable along the contact surface 16.

  Here, in the embodiment of FIG. 1, the intermediate member 5 corresponds to an example of “one member” according to the present invention, and the main valve member 2 corresponds to an example of “the other member” according to the present invention. In the present invention, contrary to the embodiment of FIG. 1, the main valve member is “one member” having a convex portion, and the intermediate member is “the other member” having a contact surface. Embodiments may be employed. Such an embodiment will be described later.

  Generally, when adjusting the length of the spring member at the time of contact of the main valve member, if the urging force of the spring member is set to a large value by reducing the length of the spring member, the direction of contact and separation of the main valve member In this case, the spring member flexes in the vertical lateral direction, so that the skid easily occurs. Here, in the conventional fluid control valve in which the spring member is directly connected to the main valve member, when the spring member causes a side slip, the main valve member is likely to be displaced in the lateral direction following the side slip. If the main valve member is displaced in the lateral direction, the opening will not be completely closed by the main valve member, and the movement of fluid will be uncontrollable, causing a problem that the original function of the fluid control valve will not be exhibited. obtain. Also, some of the conventional fluid control valves have an intermediate member connected to the spring member interposed between the spring member and the main valve member. Even if it is not fixedly connected to the main valve member, it fits with the main valve member. Therefore, even in such a fluid control valve, the above-described problem may occur if the spring member causes a side slip.

  On the other hand, in the fluid control valve 1 of FIG. 1, the spring member 4 moves in the horizontal direction (direction of the double-headed arrow X in the figure) perpendicular to the direction in which the main valve member 2 contacts and separates (the direction of the center axis AA ′ in the figure). ), The projection 18 of the intermediate member 5 moves on the contact surface 16 while contacting the contact surface 16 of the main valve member 2. For this reason, it is difficult for the main valve member 2 itself to follow the sideslip of the spring member 4. As a result, in the fluid control valve 1 of FIG. 1, the displacement of the main valve member 2 due to the side slip of the spring member 4 is suppressed. The side slip of the spring member 4 is eliminated by reducing the urging force of the spring member 4. At this time, the convex portion 18 moves on the contact surface 16 while contacting the contact surface 16 and returns to the original position. Return to

  Here, as shown in FIG. 1, the intermediate member 5 has a plate-shaped intermediate member body 17 having one surface connected to the spring member 4 and the other surface facing the contact surface 16 of the main valve member 2. It is preferable that a protrusion having a rounded end surface is formed as the above-described protrusion 18 on the other surface.

  Since the intermediate member main body 17 has a flat plate shape, the connection portion of the spring member 4 to one surface of the two-dimensionally expanded intermediate member main body 17 can be made as long as possible, and the connection state can be strengthened. In addition, by providing a convex portion having a rounded tip surface as the above-mentioned convex portion 18 on the other surface of the intermediate member main body 17, contact between the intermediate member 5 and the main valve member 2 is provided. The state becomes smooth, and it becomes more difficult for the main valve member 2 to follow the spring member 4 due to the side slip.

  As shown in FIG. 1, the intermediate member main body 17 has the concave portion 19 on the other surface described above, has a thickness greater than the depth of the concave portion 19, and has a rounded tip surface in the thickness direction. It is more preferable that the convex portion 18 is formed by fitting a curved member having a curved surface into the concave portion 19 with the side opposite to the tip surface facing the bottom of the concave portion 19.

  According to this further preferred embodiment, the convex portion 18 having a rounded distal end surface can be easily formed on the intermediate member main body 17. Even when the projection 18 is damaged due to wear or the like, only the new projection 18 needs to be replaced, and the intermediate member main body 17 can be used as it is. For this reason, convenience is high in this more preferable embodiment.

  Further, as shown in FIG. 1, it is particularly preferable that the curved surface member (projection 18) is a spherical member having a diameter longer than the depth of the recess 19.

  According to this particularly preferred embodiment, the contact portion of the convex portion 18 with the contact surface 16 of the main valve member 2 is a single point like the point B shown in FIG. Is realized.

  In the present invention, in addition to the embodiment in which the convex portion 18 is formed by fitting and fixing the spherical member in the concave portion 19 as shown in FIG. Another embodiment in which the convex portion is formed by being disposed in the inside may be adopted. In such another embodiment, the position of the intermediate member is somewhat unstable due to the rotation of the spherical member, but a very smooth contact state between the main valve member and the intermediate member is realized. The effect of preventing the displacement of the main valve member due to the side slip of the member is extremely high. Such an alternative embodiment is substantially the same as the embodiment of FIG. 1 except that the spherical member is rotatably disposed within the recess. Therefore, with respect to such another embodiment, the detailed description thereof will be omitted by referring to FIG. 1 and the description of FIG.

  Returning to the embodiment of FIG. 1, the description will be continued.

  In the embodiment of FIG. 1, the curved surface member (projection 18) is made of a metal material having a Vickers hardness specified by JIS Z 2244 larger than the material of the intermediate member main body 17. In the invention, such a form is particularly preferable.

  Since the convex portion 18 is a contact portion of the intermediate member 5 with the contact surface 16 of the main valve member 2, it is desired that the convex portion 18 be made of a hard material that is not easily worn. Examples of such a material include a metal material having a large Vickers hardness specified in JIS Z 2244. In the present invention, the entire intermediate member 5 including the intermediate member main body 17 as well as the convex portion 18 may be made of such a metal material. However, when the intermediate member main body 17 is made of such a metal material, there may be a problem that the intermediate member 5 has an unnecessarily heavy weight and leads to an increase in cost. Therefore, by configuring the curved surface member (convex portion 18) with a metal material having a higher Vickers hardness than the constituent material of the intermediate member main body 17 that does not require high wear durability, the above problem can be avoided. High wear durability can be realized in the contact portion with the contact surface 16.

  Here, as a constituent material of the curved surface member (convex portion 18), for example, a so-called steel material in which carbon, nickel, chromium, cobalt, or the like is added to iron can be given. On the other hand, as the intermediate member main body 17, a metal material (including an alloy material) such as iron or aluminum having a Vickers hardness smaller than such a steel material or a reinforced plastic material can be used. In addition, as the material of the portion having the contact surface 16 in the main valve member 2, the same material as the constituent material of the curved surface member (convex portion 18) can be adopted.

  As shown in FIG. 1, the main valve member 2 includes a metal main valve body 14 having an abutting surface 16 and abutting against a valve seat 13 to close the opening 12. It is preferable to have a diaphragm provided with a film portion 15 made of a thin film-shaped elastic member disposed and having an outer peripheral end fixed to the housing 3. In the example of FIG. 1, as an example of a preferred embodiment in which the main valve member 2 has such a diaphragm, the main valve member 2 itself is a diaphragm.

  Such a diaphragm (main valve member 2) has an advantage that the presence and absence of the membrane portion 15 allows the main valve body 14 to flexibly contact and separate while maintaining the fluid tightness. The main valve body 14 can easily follow the movement of the spring member 4. For this reason, in the conventional fluid control valve described above, the problem of the displacement of the main valve member due to the sliding of the spring member tends to be particularly serious. Therefore, the mechanism of the present embodiment that makes it difficult for the main valve member 2 to follow the side slip of the spring member 4 by the intermediate member 5 having the convex portion 18 becomes particularly useful.

  Hereinafter, the configuration of the fluid control valve 1 of FIG. 1 will be described in more detail.

  The fluid control valve 1 of FIG. 1 includes an auxiliary spring 6, an urging force adjusting member 7, and a spring fixing member 8 in addition to the components described above.

  The auxiliary spring 6 is a spring whose one end is fixed near the valve seat 13 and the other end is fixed to the main valve body 14 in the space 10 inside the housing 3. The auxiliary spring 6 urges the main valve main body 14 in a direction in which the main valve main body 14 is separated from the valve seat 13, and the urging force causes the main valve main body 14 to come in contact with the valve seat 13. 14 momentum is weakened. That is, the auxiliary spring 6 has a role as a buffer spring against contact of the main valve body 14 with the valve seat 13.

  The biasing force adjusting member 7 is a member for adjusting the magnitude of the biasing force exerted on the main valve member 2 by the spring member 4, and is a knob-shaped member that rotates around the center axis AA ′ in the drawing as a rotation axis. . The biasing force adjusting member 7 has a main shaft 20 extending in the direction of the central axis AA ′, and the main shaft 20 is inserted into the space 10 inside the housing 3. On the other hand, portions of the biasing force adjusting member 7 other than the main shaft 20 are exposed to the outside of the housing 3, and when viewed from outside the fluid control valve 1, the portions other than the main shaft 20 are the knobs. Recognized as an operation unit. Here, a thread groove (not shown) that fits with each other is formed at a portion where the urging force adjusting member 7 and the housing 3 are in contact with each other. When the urging force adjusting member 7 rotates around the central axis AA ′ in the drawing as a rotation axis, the urging force adjusting member 7 is relatively moved with respect to the housing 3 by the screw grooves. Move up or down in the figure along the direction.

  Here, the main shaft 20 is provided with a flange portion 21 extending in a direction away from the central axis AA '. On a surface of the flange portion 21 facing the direction in which the main shaft 20 is inserted, the spring fixing member 8 is arranged around the main shaft 20 so as to be rotatable around the main shaft 20. For this reason, even when the urging force adjusting member 7 rotates about the central axis AA ′ in the figure as a rotation axis, the spring fixing member 8 moves in the direction of the central axis AA ′ (vertical direction in the figure) together with the flange portion 21. However, it is difficult to rotate around the main shaft 20. Here, one end of the spring member 4 is fixed to the spring fixing member 8, and the spring member 4 extends toward the intermediate member 5 so as to surround the main shaft 20, and the other end of the spring fixing member 8. Are connected to the intermediate member 5 as described above. That is, the spring member 4 is disposed around the main shaft 20 while being sandwiched between the spring fixing member 8 and the intermediate member 5. Here, in the fluid control valve 1 of FIG. 1, the distance between the spring fixing member 8 and the intermediate member 5 (that is, the length of the spring member 4) is set so as to always be shorter than the natural length of the spring member 4. I have. For this reason, a biasing force in a direction away from each other is always applied from the spring member 4 to each of the spring fixing member 8 and the intermediate member 5. As a result, the spring fixing member 8 is always pressed against the flange portion 21, and the intermediate member 5 is always pressed against the main valve member 2. In this way, the contact state between the intermediate member 5 and the main valve member 2 (more precisely, the contact state between the projection 18 of the intermediate member 5 and the contact surface 16 of the main valve member 2) is always maintained. .

  The user of the fluid control valve 1 rotates the urging force adjusting member 7 around the central axis AA ′ in a state where the main valve member 2 is in contact with the valve seat 13 so that the Can be adjusted to a desired value. In other words, the flange portion 21 moves in the direction of the center axis AA '(up and down direction in the figure) in response to the user's adjustment operation, so that the distance between the spring fixing member 8 and the intermediate member 5 on the flange portion 21 is increased. (That is, the length of the spring member 4) is adjusted to a desired value. Thereby, the user can arbitrarily set the urging force of the spring member 4 when the main valve member 2 abuts.

  Here, in the fluid control valve 1 of FIG. 1, the main valve member 2 is moved away from the valve seat 13 along with the intermediate member 5 along the central axis AA ′ so as to move away from the valve seat 13. The length of the member 4 is set to be shorter than the length of the main shaft 20. Therefore, the spring member 4 always has a lower portion 4B on the intermediate member 5 side not surrounding the main shaft 20 in addition to the upper portion 4A on the side of the spring fixing member 8 surrounding the main shaft 20. Generally, in a portion of the spring member such as a lower portion 4B in the figure, where there is no shaft member (the main shaft 20 in FIG. 1) that holds the posture of the spring member inside the spiral shape of the spring member, the spring member laterally shifts. Is particularly likely to occur. For this reason, in the present embodiment in which the lower portion 4B is present, the mechanism of the present embodiment in which the intermediate member 5 having the convex portion 18 makes it difficult for the main valve member 2 to follow the sideslip of the spring member 4 becomes particularly useful.

  In the above description, one end of the spring member 4 is fixed to the spring fixing member 8 rotatable around the main shaft 20. However, as shown in FIG. In the case of a spherical member having a diameter, a form in which one end of the spring member 4 is directly fixed to the flange portion 21 without using the spring fixing member 8 may be adopted. In this case, when the urging force adjustment member 7 rotates, the spring member 4 also rotates, but the contact portion of the intermediate member 5 with the contact surface 16 of the main valve member 2 is one point B on the protrusion 18. Therefore, the intermediate member 5 rotates according to the rotation of the spring member 4 without rotating the main valve member 2. For this reason, even if the urging force adjusting member 7 rotates, the length of the spring member 4 only expands and contracts, and the spring member 4 itself is prevented from being twisted. This embodiment has an advantage that the number of components is reduced by omitting the spring fixing member 8.

  Hereinafter, the operation of the fluid control valve 1 of FIG. 1 as a relief valve (safety valve) will be described.

  The fluid control valve 1 of FIG. 1 is connected to a first fluid storage unit (not shown) outside the fluid control valve 1 via a first port 11a, and is connected to a fluid outside the fluid control valve 1 via a second port 10a. It is connected to a second fluid storage unit (not shown). Here, the same type of fluid is contained in each of the first fluid containing portion and the second fluid containing portion. Although the pressure of the fluid in the first fluid container is not so high as tolerable, the pressure of the fluid in the second fluid container is the second fluid unless a special decompression process is performed. The pressure may become unacceptably high due to factors such as the processing environment of the fluid in the storage unit. In order to avoid such a high pressure state in the second fluid storage section, the fluid control valve 1 of FIG. 1 has a fluid chamber 9A (see the following description) communicating with the second fluid storage section via the second port 10a. To control the pressure of the fluid. Hereinafter, this control mechanism will be described in detail.

  In the fluid control valve 1, in the space 10 inside the housing 3, the outer peripheral end of the membrane portion 15 of the main valve member 2 made of a diaphragm is fixed to the housing 3 as described above, so that the space Reference numeral 10 is divided into a fluid chamber 9A and a storage chamber 9B. The fluid chamber 9A is a room containing a fluid to be pressure-controlled, and the accommodation room 9B is a room that accommodates the spring member 4 and the intermediate member 5. Here, in the fluid control valve 1, under the urging force of the spring member 4 set via the urging force adjusting member 7, the main valve body 14 of the main valve member 2 moves to the valve seat 13 as shown in FIG. A state in which the opening 12 is closed by contact is a normal state (hereinafter, referred to as a normal state). In this normal state, except for the portion connected to the second port 10a, the fluid chamber 9A forms a closed space surrounded by the wall surface of the space 10 and the main valve member 2 inside the housing 3. ing. The fluid chamber 9A is connected to a second fluid storage unit (not shown) via the second port 10a, and the pressure of the fluid in the fluid chamber 9A is the same as the pressure of the fluid in the second fluid storage unit. It is.

  On the other hand, air outside the fluid control valve 1 can enter the accommodation room 9B from a slight gap between the urging force adjusting member 7 and the housing 3, and therefore, the accommodation room 9 </ b> B Filled with air with pressure. Here, due to the presence of the main valve member 2, the air in the storage chamber 9B and the fluid in the fluid chamber 9A are almost completely shut off.

  The communication hole 11 is connected to a first fluid storage unit (not shown) via the first port 11a. The pressure of the fluid in the communication hole 11 is equal to the pressure of the fluid in the first fluid storage unit. The same, but not so high pressure that is acceptable.

  With the configuration described above, the pressure for separating the main valve member 2 from the valve seat 13 acts on the main valve member 2 in the normal state from the fluid in the fluid chamber 9A and the communication hole 11, and the accommodation chamber From the air of 9B, a pressure acts to bring the main valve member 2 into contact with the valve seat 13. Further, as described above, the urging force for bringing the main valve member 2 into contact with the valve seat 13 acts on the main valve member 2 as described above. Of the valve seat 13 acts on the valve seat 13. Further, a reaction force (vertical reaction force) that the main valve member 2 receives from the valve seat 13 in a direction away from the valve seat 13 is applied, and all these forces are balanced, whereby the main valve member 2 in the direction of the center axis AA ′ is balanced. The position is maintained at a position abutting the valve seat 13 as shown in FIG.

  Here, when the pressure of the fluid in the second fluid storage unit increases due to factors such as the processing environment of the fluid in the second fluid storage unit, among the various forces acting on the main valve member 2, The pressure from the fluid in the fluid chamber 9 </ b> A that tends to separate the main valve member 2 from the valve seat 13 increases. Therefore, the force for separating the main valve member 2 from the valve seat 13 becomes dominant, and the main valve member 2 starts moving in a direction away from the valve seat 13. As a result, the opening 12 is opened to open the fluid flow path between the first port 11a and the second port 10a, and the fluid in the high-pressure fluid chamber 9A (and the second fluid accommodating portion) is opened. It moves to the communication hole 11 (and the first fluid storage part) through the part 12. Due to this movement of the fluid, the pressure of the fluid in the second fluid storage portion gradually decreases, and the pressure acting on the main valve member 2 from the fluid in the fluid chamber 9A also decreases. Eventually, the force for bringing the main valve member 2 into contact with the valve seat 13 becomes dominant, and the main valve member 2 starts moving in the direction toward the valve seat 13 this time. Then, the main valve member 2 again comes into contact with the valve seat 13 to close the opening 12, and the fluid flow path between the first port 11a and the second port 10a is closed. As a result, the normal state of FIG. 1 is realized again.

  The above is the description of the operation of the fluid control valve 1 in FIG. 1 as a relief valve (safety valve). In this way, in the fluid control valve 1, it is possible to prevent the pressure of the fluid in the fluid chamber 9A (and the second fluid storage portion) from becoming unacceptably high.

  The above is the description of the embodiment in FIG.

  In the embodiment of FIG. 1, the intermediate member 5 has the convex portion 18 and the main valve member 2 has the contact surface 16. However, in the present invention, contrary to the embodiment of FIG. May have a convex portion, and the intermediate member may have an abutment surface. Hereinafter, such an embodiment will be described.

  FIG. 2 is a schematic cross-sectional view of a fluid control valve 1 ′ according to an embodiment of the present invention in which a main valve member has a convex portion and an intermediate member has a contact surface.

  In FIG. 2, the same components as those of the fluid control valve 1 of FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated. The fluid control valve 1 'includes a main valve member 2' and an intermediate member 5 'in addition to the housing 3 and the spring member 4 described in FIG.

  The main valve member 2 ′ can be brought into contact with and separated from the valve seat 13, and the first port 11 a is opened by closing the opening 12 when contacting with the valve seat 13 and opening the opening 12 when separating from the valve seat 13. It plays the role of switching between closing and opening of the fluid flow path between the first and second ports 10a.

  The intermediate member 5 'is connected to the spring member 4. Further, the intermediate member 5 'is in contact with the main valve member 2', and the urging force of the spring member 4 is transmitted to the main valve member 2 'while the main valve member 2' moves toward and away from the valve seat 13. Follow and move.

  Here, the main valve member 2 ′ has a projection 18 ′ protruding toward the intermediate member 5 ′ on a surface facing the intermediate member 5 ′, and the intermediate member 5 ′ is It has a flat contact surface 16 ′ that contacts the 2 ′ convex portion 18 ′. The intermediate member 5 'is in contact with the main valve member 2' at the protrusion 18 'in such a manner that the protrusion 18' is relatively movable along the contact surface 16 '. Here, the main valve member 2 'corresponds to an example of "one member" according to the present invention, and the intermediate member 5' corresponds to an example of "the other member" according to the present invention.

  In the fluid control valve 1 'of FIG. 2, the spring member 4 is moved in the horizontal direction (the direction of the double-headed arrow X in the figure) perpendicular to the direction in which the main valve member 2' contacts and separates (the direction of the center axis AA 'in the figure). ), The contact surface 16 ′ of the intermediate member 5 ′ moves along the plane where the contact surface 16 ′ spreads while contacting the convex portion 18 ′ of the main valve member 2 ′. For this reason, the main valve member 2 ′ itself does not easily follow the sideslip of the spring member 4. As a result, in the fluid control valve 1 ′ of FIG. 2, the displacement of the main valve member 2 ′ due to the skid of the spring member 4 is suppressed. Note that the side slip of the spring member 4 is eliminated by reducing the urging force of the spring member 4, and at this time, the contact surface 16 'is in contact with the convex portion 18' and the contact surface 16 'is widened. Move along the plane and return to the original position.

  Here, as shown in FIG. 2, the intermediate member 5 ′ has one surface connected to the spring member 4 and the other surface formed with a contact surface 16 ′ facing the convex portion 18 ′ of the main valve member 2 ′. It is preferably a flat plate.

  Since the intermediate member 5 'has a flat plate shape, it is possible to make the connection portion of the spring member 4 to one surface of the two-dimensionally expanded intermediate member 5' as long as possible, thereby strengthening the connection state.

  As shown in FIG. 2, the main valve member 2 ′ has a concave portion 19 ′ on the surface facing the contact surface 16 ′ of the intermediate member 5 ′, and has a thickness greater than the depth of the concave portion 19 ′. A convex member having a curved surface member having a front end surface in a thickness direction having a rounded curved surface is fitted into the concave portion 19 'with the opposite side to the front end surface facing the bottom of the concave portion 19'. More preferably, 18 'is formed.

  According to this further preferred embodiment, the convex portion 18 'having a rounded distal end surface can be easily formed in the main valve member 2'. Even when the projection 18 'is damaged due to abrasion or the like, only the new projection 18' needs to be replaced, and portions other than the projection 18 'can be used as they are. For this reason, convenience is high in this more preferable embodiment.

  Further, as shown in FIG. 2, it is particularly preferable that the curved surface member (projection 18 ') is a spherical member having a diameter longer than the depth of the recess 19'.

  According to this particularly preferred embodiment, the contact area of the convex portion 18 'with the contact surface 16' of the intermediate member 5 'is one point such as the point B' shown in FIG. A good contact state is realized.

  In the present invention, in addition to the embodiment in which the convex portion 18 'is formed by fitting and fixing the spherical member into the concave portion 19' as shown in FIG. Another embodiment in which the convex portion is formed by being disposed in the concave portion may be adopted. In such another embodiment, the position of the intermediate member is somewhat unstable due to the rotation of the spherical member, but a very smooth contact state between the main valve member and the intermediate member is realized. The effect of preventing the displacement of the main valve member due to the side slip of the member is extremely high. Such an alternative embodiment is substantially the same as the embodiment of FIG. 2, except that the spherical member is rotatably disposed within the recess. Therefore, with respect to such another embodiment, detailed description thereof will be omitted by referring to FIGS.

  Returning to the embodiment of FIG. 2, the description will be continued.

  In the embodiment of FIG. 2, the curved surface member (projection 18 ′) is made of a metal material having a Vickers hardness specified by JIS Z 2244 larger than the material of the recess 19 ′. Then, such a form is particularly preferable.

  Since the convex portion 18 'is a portion of the main valve member 2' in contact with the contact surface 16 'of the intermediate member 5', it is desirable that the convex portion 18 'be made of a hard material that is hard to wear. Examples of such a material include a metal material having a large Vickers hardness specified in JIS Z 2244. In the present invention, not only the convex portion 18 'but also the concave portion 19' may be made of such a metal material. However, when the main valve member 2 'is made of such a metal material, there may be a problem that the main valve member 2' has an unnecessarily heavy weight, which leads to an increase in cost. Therefore, by configuring the curved surface member (convex portion 18 ') with a metal material having a higher Vickers hardness than the constituent material of the concave portion 19' which does not require high wear durability, the above problem can be avoided. High wear durability can be realized at the contact portion with the contact surface 16 '.

  Here, as a constituent material of the curved surface member (convex portion 18 '), for example, a so-called steel material in which carbon, nickel, chromium, cobalt, or the like is added to iron can be given. On the other hand, as a constituent material of the concave portion 19 ', a metal material (including an alloy material) such as iron or aluminum having a lower Vickers hardness than such a steel material or a reinforced plastic material can be used. In the intermediate member 5 ', the same material as that of the curved surface member (projection 18') can be used as the material of the portion having the contact surface 16 '.

  As shown in FIG. 2, the main valve member 2 ′ includes a metal main valve body 14 ′ having a projection 18 ′ and abutting against the valve seat 13 to close the opening 12, and a main valve body 14 ′. It is preferable to have a diaphragm provided with a film portion 15 which is formed of a thin film-like elastic member and is fixed to the housing 3 at its outer periphery. In the example of FIG. 2, as an example of a preferred embodiment in which the main valve member 2 'has such a diaphragm, the main valve member 2' itself is a diaphragm.

  Such a diaphragm (main valve member 2 ′) has an advantage that the presence of the membrane portion 15 allows the main valve main body 14 ′ to flexibly contact and separate while maintaining the fluid tightness. Therefore, the main valve body 14 ′ can easily follow the movement of the spring member 4. For this reason, in the conventional fluid control valve described above, the problem of the displacement of the main valve member due to the sliding of the spring member tends to be particularly serious. Therefore, the mechanism of the present embodiment that makes it difficult for the main valve member 2 ′ to follow the sideslip of the spring member 4 by the intermediate member 5 ′ having the contact surface 16 ′ that contacts the convex portion 18 ′ is particularly useful.

  2 includes an auxiliary spring 6, an urging force adjusting member 7, and a spring fixing member 8 in addition to the components described above. These components are the same as those described with reference to FIG. 1, and a description thereof will not be repeated. The operation of the fluid control valve 1 'of FIG. 2 as a relief valve (safety valve) is also the same as that described with reference to FIG. 1, and a description thereof will be omitted.

  In the above description, the fluid control valve 1 functioning as a relief valve (safety valve) has been described as an example of the fluid control valve of the present invention. However, the fluid control valve of the present invention keeps the pressure of the fluid after the pressure reduction constant. It may be applied to various valves, such as a pressure reducing valve, which have slightly different uses and functions from a relief valve (safety valve). In general, in a pressure reducing valve, the diaphragm itself does not abut the valve seat, but another member abuts against the valve seat, and the diaphragm plays a role of transmitting the urging force of the spring member to such another member. Many. Also in the pressure reducing valve of such a form, the intermediate member of the present invention provided between the diaphragm and the spring member performs the same function as the intermediate member 5 in the embodiment described above. In this case, the whole of the members that contribute to opening and closing of the fluid flow path, including the diaphragm and the other members described above, corresponds to an example of the “main valve member” according to the present invention.

  In the above description, the user of the fluid control valve 1 rotates the urging force adjusting member 7 to adjust the length of the spring member 4 when the main valve member 2 abuts. Instead of such a manual adjustment operation, the control valve may adopt a mode in which the adjustment operation is performed by electromagnetic means using a solenoid or the like (for example, see Patent Document 1).

  INDUSTRIAL APPLICABILITY The present invention is useful for realizing a fluid control valve that suppresses displacement of a main valve member due to side slippage of a spring member.

1, 1 ': fluid control valve, 2, 2': main valve member, 3: housing, 4: spring member, 4A: upper portion, 4B: lower portion, 5, 5 ': intermediate member, 6: auxiliary Spring, 7: biasing force adjusting member, 8: spring fixing member, 9A: fluid chamber, 9B: accommodation chamber, 10: space, 10a: second port, 11: communication hole, 11a: first port, 12: opening Part, 13: valve seat, 14, 14 ': main valve main body, 15: membrane part, 16, 16': contact surface, 17: intermediate member main body, 18, 18 ': convex part, 19, 19': concave part , 20: spindle, 21: flange.

Claims (6)

A first port and a second port through which fluid flows in and out, a communication hole communicating with the first port and having an opening separate from the first port, and a communication port communicating with the second port and through the opening; A space communicating with the communication hole is formed, and a housing having a valve seat around the opening;
Contact and separation with respect to the valve seat are possible, and the first port and the second port are closed by closing the opening at the time of contact with the valve seat and opening the opening at the time of separation from the valve seat. A main valve member for switching between closing and opening of a fluid flow path therebetween;
A spring member that extends in a direction in which the main valve member comes into contact with or separates from the valve seat, and applies an urging force to the main valve member in accordance with the length of the extending direction, wherein the main valve member is the valve; A spring member whose length in the extending direction when in contact with the seat is variable by a user's adjustment operation,
The main valve member is connected to the spring member and abuts on the main valve member. The urging force of the spring member is transmitted to the main valve member, and the main valve member moves following the movement of the main valve member with respect to the valve seat. And an intermediate member,
One of the main valve member and the intermediate member has a protrusion protruding toward the other member on a surface facing the other member, and the other member is The intermediate member has a flat contact surface that comes into contact with the convex portion, and the intermediate member is provided on the main valve member at the convex portion so that the convex portion is relatively movable along the contact surface. The fluid control valve that is in contact.   The one member is the intermediate member and the other member is the main valve member, and the intermediate member has one surface connected to the spring member and the other surface abutting the main valve member. And a flat-shaped intermediate member main body facing the surface, wherein a convex portion having a rounded tip surface is formed as the convex portion on the other surface. 3. The fluid control valve according to item 1.   The intermediate member main body has a concave portion on the other surface, and a curved surface member having a thickness longer than a depth of the concave portion and having a tip end surface in a thickness direction having a rounded curved surface is provided. The fluid control valve according to claim 2, wherein the convex portion is formed by being fitted into the concave portion with the side opposite to the distal end face facing the bottom of the concave portion.   The fluid control valve according to claim 3, wherein the curved surface member is a spherical member having a diameter longer than a depth of the concave portion.   5. The fluid control valve according to claim 3, wherein the curved surface member is made of a metal material having a Vickers hardness specified by JIS Z 2244 larger than a material of the intermediate member main body.   The main valve member includes a metal main valve body having the contact surface and abutting against the valve seat to close the opening, and a thin film-shaped elastic member disposed around the main valve body. The fluid control valve according to any one of claims 1 to 5, wherein the diaphragm includes a diaphragm having an end portion fixed to the housing.

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