JP4525969B2 - Valve body and fluid shutoff valve - Google Patents

Description

  The present invention relates to a valve body and a fluid shut-off valve that are used in, for example, gas equipment such as a gas meter, water pipe equipment, air conditioning equipment, and the like, and close at least some of the plurality of flow paths.

Conventionally, fluid shut-off valves have been used in gas equipment such as gas meters, water pipe equipment, air conditioning equipment, and the like. A valve chamber is formed inside the fluid shut-off valve, and a plurality of flow paths are connected to the valve chamber. A valve body is movably disposed in the valve chamber, and the valve body closes the flow path by being pressed against a valve seat portion that constitutes an end of one flow path. The inflow of the fluid from the chamber to the flow path is prevented (see, for example, Patent Document 10 below).
Here, in general, the valve body includes a rubber member that comes into contact with the valve seat portion, and a support member that is attached with the rubber member and presses the rubber member against the valve seat portion. By contacting the valve seat through the rubber member, the sealing performance in the valve seat is improved.

Japanese Patent Laid-Open No. 5-149252 Japanese Utility Model Publication No. 45-22631 Japanese Utility Model Publication No. 8-507 Japanese Utility Model Publication No. 62-179469 JP-A-57-54779 Japanese Utility Model Publication No. 49-134724 Japanese Utility Model Publication No. 3-57568 Japanese Utility Model Publication No.59-127967 Japanese Utility Model Publication No. 56-10551 JP 11-182893 A JP 2000-110959 A JP-A-5-196157 Japanese Utility Model Publication No. 53-155129

  By the way, when a foreign body such as a wire is sandwiched between the valve seat portion and the rubber member constituting the valve body when the valve body comes into contact with the valve seat portion, the rubber member is attached to the support member. Therefore, a gap is formed between the valve body and the valve seat portion. For this reason, there is a problem that the flow path cannot be completely blocked by the valve body, and fluid flows from the flow path to the valve chamber or from the valve chamber to the flow path, causing a problem.

  In view of the above circumstances, an object of the present invention is to provide a valve body and a fluid shut-off valve that can improve the sealing performance in the valve seat portion and reliably close the flow path.

The present invention relates to a valve body for closing the is pressed against the passage in the valve seat portion formed on the end of the passage, the valve seat and an elastic member in contact with the valve seat portion, the elastic member And a pressing part that is provided concentrically with the elastic body and positions the elastic body by sandwiching the elastic body between the elastic part and from the center of the pressing part. The dimension is less than 50% of the dimension from the center of the elastic body to the outline.

According to this invention , the elastic body which comprises a valve body is pressed by the valve seat part formed in the edge part of the flow path by the collar part, and a flow path is obstruct | occluded. At this time, when a foreign matter such as a wire is sandwiched between the valve seat portion and the elastic body, the elastic body is sandwiched between the flange portion and the foreign matter such as a wire.
Here, since the pressing part is provided concentrically with the elastic body, and the dimension from the center of the pressing part to the outline is less than 50% of the dimension from the center of the elastic body to the outline, The vicinity of the outer shell (outer edge) is easily elastically deformed without being restrained by the pressing portion. For this reason, when the elastic body is sandwiched between the flange and a foreign object such as a wire at a predetermined pressure, the elastic body is elastically deformed so that the outer periphery (outer edge) of the elastic body wraps the foreign object such as the wire, and the valve seat Sealing performance can be improved. As a result, even when a foreign substance such as a wire is sandwiched between the valve seat portion and the elastic body of the valve body, the flow path can be reliably closed.
In the present specification, the “dimension from the center of the pressing portion to the outline” means, for example, a diameter if the pressing portion is circular, and means a dimension from the center to each side if the pressing portion is square. In addition, when the dimension from the center of a holding | suppressing part to each side is not constant, it means an average value.
The “dimension from the center of the elastic body to the outline” means, for example, a diameter if the elastic body is circular, and a dimension from the center to each side if the elastic body is square. In addition, when the dimension from the center of an elastic body to each side is not constant, it means an average value.

In the present invention, the dimension from the center of the pressing portion to the outline may be 15% or more and 35% or less of the dimension from the center of the elastic body to the outline.

According to the present invention , since the dimension from the center of the pressing portion to the outer shape is 15% or more and 35% or less of the size from the center of the elastic body to the outer shape, the holding performance for holding the elastic body, the valve seat, It is possible to improve both the sealing performance of the valve seat portion of the elastic body in a state where foreign matters such as wires are sandwiched between the portions.
On the contrary, if the dimension from the center of the holding part to the outer shell is less than 15% of the dimension from the center of the elastic body to the outer shell, the elastic body is more easily elastically deformed and the sealing performance of the valve seat is further improved. However, since the holding performance of the elastic body is lowered, it is difficult to achieve both holding performance and sealing performance.
On the other hand, if the dimension from the center of the presser part to the outline is larger than 35% of the dimension from the center of the elastic body to the outline, the holding performance of the elastic body is greatly improved. Therefore, the vicinity of the outer shell (outer edge) is hardly elastically deformed, so that the sealing performance is lowered, and it is difficult to achieve both the holding performance and the sealing performance.

The invention according to claim 1 is a valve body that is in pressure contact with a plurality of valve seat portions formed at end portions of a plurality of flow paths and closes the flow paths, and is in contact with the one valve seat section. A first elastic body; a flange that presses the first elastic body against the valve seat; and a first elastic body that is provided concentrically with the first elastic body and sandwiched between the first elastic body and the first elastic body. The collar part is sandwiched between a first pressing part for positioning one elastic body and the first elastic body, and is in contact with the other valve seat part and is pressed by the other valve seat part by the collar part. A second elastic body, and a second pressing part that is provided concentrically with the second elastic body and sandwiches the second elastic body between the flange part and positions the second elastic body, The dimension from the center of the first pressing part to the outline is less than 50% of the dimension from the center of the first elastic body to the outline, and is the center of the second pressing part? A valve body whose dimension to the outer shell is less than 50% of a dimension from the center of the second elastic body to the outer shell, a space portion in which the valve body is movably disposed, and a liquid inflow for introducing liquid into the space portion A passage, a first valve seat portion formed at an end of the liquid inflow passage, a liquid outflow passage for guiding the liquid flowing into the space portion to the outside, an air passage for guiding air into the space portion, and the air A second valve seat portion formed at an end portion of the path, and the first elastic body comes into contact with the first valve seat portion by the valve body moving in one direction in the space portion. The liquid inflow passage is closed, and the valve body moves in the space in the other direction, whereby the second elastic body comes into contact with the second valve seat portion to close the air passage, and the first valve In the seat part or in the vicinity thereof, the liquid inflow path and the space part when the first elastic body contacts the first valve seat part The communication means includes a notch that is formed in the first valve seat portion and opens to the first elastic body when the first elastic body contacts the first valve seat portion. The notch groove is configured such that, when a negative pressure is generated in the liquid inflow passage, the first elastic body contacting the first valve seat portion is elastically deformed and a part thereof enters the inside. Thus, a part of the notch groove is blocked.

According to the first aspect of the present invention, when a pressure in a predetermined direction acts on the valve body, the valve body moves, and the first elastic body constituting the valve body is pressed by the flange portion, and the one valve seat portion is pressed. Press contact. Thereby, the flow path in which the one valve seat part is formed is obstruct | occluded. Further, when a pressure in a different direction acts on the valve body, the valve body moves, and the second elastic body constituting the valve body is pressed by the flange portion and is brought into pressure contact with the other valve seat portion. Thereby, the flow path in which the other valve seat part is formed is closed. At this time, when a foreign object such as a wire is sandwiched between one valve seat portion and the first elastic body and / or between the other valve seat portion and the second elastic body, the first elasticity A body or / and a 2nd elastic body will be in the state pinched | interposed between foreign materials, such as a buttocks and a wire.
Here, the first pressing portion is provided concentrically with the first elastic body, and the second pressing portion is provided concentrically with the second elastic body, and the dimension from the center of each pressing portion to the outline. Is configured to be less than 50% of the dimension from the center of each elastic body to the outer shell, so that the vicinity of the outer shell (outer edge) of each elastic body is easily restrained by each pressing portion and easily elastically deformed. For this reason, when each elastic body is sandwiched between the buttock and a foreign object such as a wire with a predetermined pressure, the outer periphery (outer edge) of each elastic body is elastically deformed so as to enclose the foreign object such as a wire, The sealing performance of the valve seat can be improved. As a result, even when a foreign object such as a wire is sandwiched between each valve seat portion and each elastic body of the valve body, each flow path can be reliably closed.
In the present specification, “the dimension from the center of the first pressing portion to the outline” means, for example, the diameter if the first pressing portion is circular, and the dimension from the center to each side if the first pressing portion is square. Means. In addition, when the dimension from the center of a 1st holding | suppressing part to each side is not constant, an average value is meant.
The “dimension from the center of the first elastic body to the outline” means, for example, a diameter if the first elastic body is circular, and a dimension from the center to each side if the first elastic body is square. In addition, when the dimension from the center of a 1st elastic body to each side is not constant, an average value is meant.
The “dimension from the center of the second pressing part to the outline” means, for example, a diameter when the second pressing part is circular, and means a dimension from the center to each side when it is square. In addition, when the dimension from the center of a 2nd holding | suppressing part to each side is not constant, an average value is meant.
The “dimension from the center of the second elastic body to the outline” means, for example, a diameter if the second elastic body is circular, and a dimension from the center to each side if the second elastic body is square. In addition, when the dimension from the center of a 2nd elastic body to each side is not constant, an average value is meant.
According to the first aspect of the present invention, when a predetermined pressure (for example, gravity acting on the valve body itself) acts on the valve body, the valve body moves in one direction and the first elastic body becomes the first valve. The liquid inflow path is closed by contacting the seat. At this time, when the liquid moves toward the valve body in the liquid inflow path, the pressure from the liquid acts on the first elastic body. Thus, when a change occurs in the pressure balance of the space portion, the valve body is pushed up from the first valve seat portion and moves in the other direction, and the second elastic body eventually comes into contact with the second valve seat portion. Thereby, an air path is obstruct | occluded. The liquid that has flowed into the space from the liquid inflow path flows out from the liquid outflow path.
On the other hand, when the inflow of the liquid from the liquid inflow path into the space portion stops, the valve body moves in one direction due to a change in the pressure balance of the space portion, and the first elastic body comes into contact with the first valve seat portion and the liquid Block the inflow path. At this time, since the space portion communicates with the air passage and air flows into the space portion (air replacement), the liquid left in the space portion flows out from the liquid outflow passage. Thereby, no liquid remains in the space.
Here, the first pressing portion is provided concentrically with the first elastic body, and the second pressing portion is provided concentrically with the second elastic body, and the dimension from the center of each pressing portion to the outline. Is configured to be less than 50% of the dimension from the center of each elastic body to the outer shell, so that the vicinity of the outer shell (outer edge) of each elastic body is easily restrained by each pressing portion and easily elastically deformed. For this reason, when each elastic body is sandwiched between the buttock and a foreign object such as a wire with a predetermined pressure, the outer periphery (outer edge) of each elastic body is elastically deformed so as to enclose the foreign object such as a wire, The sealing performance of the valve seat can be improved. As a result, even when a foreign object such as a wire is sandwiched between each valve seat portion and each elastic body of the valve body, each flow path can be reliably closed.
Particularly, the dimension from the center of the first pressing part to the outline is 15% to 35% of the dimension from the center of the first elastic body to the outline, and the dimension from the center of the second pressing part to the outline is the second elasticity. Since it is configured to be 15% or more and 35% or less of the dimension from the center of the body to the outer shell, the holding performance of each elastic body and each valve of each elastic body in a state where foreign matters such as wires are sandwiched between the valve seat portions Both the sealing performance in the seat can be improved.
Also, according to the invention described in claim 1, since the communication means is provided in the first valve seat or its vicinity, the liquid flows when the first elastic member is in contact with the first valve seat portion The road and the space are in communication. At this time, since the space portion is in communication with the air passage, air flows into the space portion, and further, the air in the space portion flows into the liquid inflow passage through the communication means. As a result, the liquid in the liquid inflow path is pressed by the air flowing in from the space portion (air replacement) and pushed out of the liquid inflow path, and the liquid inflow path can be drained.
According to the first aspect of the present invention, since the communication means is a notch groove that opens to the first elastic body when the first elastic body contacts the first valve seat portion, the communication means is easily formed. be able to.
In particular, when a negative pressure is generated in the liquid inflow path, the first elastic body that contacts the first valve seat portion is elastically deformed, and a part of the first elastic body enters the notch groove, so that the liquid inflow path It is possible to prevent the communication performance with the space from increasing more than necessary. In other words, it is possible to drain the liquid inflow path by forming a notch groove, but at this time, air flows from the air path into the liquid inflow path through the space portion, so that the liquid inflow path and the space portion are Negative pressure state. If the liquid inflow path or the space is in a negative pressure state, the liquid may flow into the liquid inflow path from the liquid outflow path, but the first elastic body is elastically deformed and a part thereof enters the notch groove. As a result, a part of the cutout groove is blocked, so that the negative pressure state of the liquid inflow path and the space can be reduced, and the inflow of liquid from the liquid outflow path to the liquid inflow path can be prevented.

According to a second aspect of the present invention , in the valve body according to the first aspect, the dimension from the center of the first pressing portion to the outer shape is 15% or more and 35% of the dimension from the center of the first elastic body to the outer shape. The dimension from the center of the second pressing part to the outline is 15% or more and 35% or less of the dimension from the center of the second elastic body to the outline.

According to the second aspect of the present invention, the dimension from the center of the first pressing part to the outline is 15% or more and 35% or less of the dimension from the center of the first elastic body to the outline, and the center of the second pressing part. Since the dimension from the center to the outer shell is 15% or more and 35% or less of the dimension from the center of the second elastic body to the outer shell, the holding performance for holding each elastic body and the foreign matter such as a wire in each valve seat portion It is possible to improve both the sealing performance in each valve seat portion of each elastic body in a state where the is sandwiched.
On the contrary, if the dimension from the center of each pressing part to the outline is less than 15% of the dimension from the center to the outline of each elastic body, the elastic deformation of each elastic body becomes easier and the sealing performance at each valve seat part. However, since the holding performance of each elastic body is lowered, it is difficult to achieve both holding performance and sealing performance.
On the other hand, if the dimension from the center of each pressing part to the outline is larger than 35% of the dimension from the center to the outline of each elastic body, the holding performance of each elastic body is greatly improved. The vicinity is constrained by each pressing portion, and the vicinity of the outer shell (outer edge) is hardly elastically deformed and the sealing performance is lowered, so that it is difficult to achieve both the holding performance and the sealing performance.

In the present invention , the holding part is provided concentrically with the elastic body, and the dimension from the center of the holding part to the outline is less than 50% of the dimension from the center of the elastic body to the outline. When sandwiched between a part and a foreign substance such as a wire, the vicinity of the outer shell (outer edge) of the elastic body is elastically deformed so as to enclose the foreign substance such as a wire, and the sealing performance of the valve seat part can be improved. As a result, even when a foreign substance such as a wire is sandwiched between the valve seat portion and the elastic body of the valve body, the flow path can be reliably closed.

The present invention, the dimension from the center of the holding portion to the outer from the center of the elastic member for the structure below 35% to 15% or more dimensions to the outer shell, the holding ability to hold the elastic member, such as a wire to the valve seat It is possible to improve both the sealing performance in the valve seat portion of the elastic body in a state where foreign matter is sandwiched.

In the present invention, the first pressing portion is provided concentrically with the first elastic body, the second pressing portion is provided concentrically with the second elastic body, and the dimension from the center of each pressing portion to the outer shell is determined for each elastic body. Since it is configured to be less than 50% of the dimension from the center to the outer shell, when each elastic body is sandwiched between the buttocks and a foreign object such as a wire with a predetermined pressure, the vicinity of the outer shell (outer edge) of each elastic body is It is possible to improve the sealing performance of each valve seat by elastically deforming so as to enclose foreign substances. As a result, even when a foreign object such as a wire is sandwiched between each valve seat portion and each elastic body of the valve body, each flow path can be reliably closed.

In the present invention, the dimension from the center of the first pressing part to the outline is 15% to 35% of the dimension from the center of the first elastic body to the outline, and the dimension from the center of the second pressing part to the outline is the second. Since it is configured to be 15% or more and 35% or less of the dimension from the center of the elastic body to the outer shell, the holding performance of holding each elastic body and each valve of each elastic body in a state where foreign matters such as wires are sandwiched between the valve seat portions Both the sealing performance in the seat can be improved.

In the present invention, when a predetermined pressure (for example, gravity acting on the valve body itself) acts on the valve body, the valve body moves in one direction, and the first elastic body comes into contact with the first valve seat portion and the liquid inflow path. Occlude. At this time, when the liquid moves toward the valve body in the liquid inflow path, the pressure from the liquid acts on the first elastic body. Thus, when a change occurs in the pressure balance of the space portion, the valve body is pushed up from the first valve seat portion and moves in the other direction, and the second elastic body eventually comes into contact with the second valve seat portion. Thereby, an air path is obstruct | occluded. The liquid that has flowed into the space from the liquid inflow path flows out from the liquid outflow path.
On the other hand, when the inflow of the liquid from the liquid inflow path into the space portion stops, the valve body moves in one direction due to a change in the pressure balance of the space portion, and the first elastic body comes into contact with the first valve seat portion and the liquid Block the inflow path. At this time, since the space portion communicates with the air passage and air flows into the space portion (air replacement), the liquid left in the space portion flows out from the liquid outflow passage. Thereby, no liquid remains in the space.
Here, the first pressing part is provided concentrically with the first elastic body, the second pressing part is provided concentrically with the second elastic body, and the dimension from the center of each pressing part to the outline is set to the center of each elastic body. Since it is configured to be less than 50% of the dimension from the outer shell to the outer shell, the vicinity of the outer shell (outer edge) of each elastic body can be easily elastically deformed without being restrained by each pressing portion. For this reason, when each elastic body is sandwiched between the buttock and a foreign object such as a wire with a predetermined pressure, the outer periphery (outer edge) of each elastic body is elastically deformed so as to enclose the foreign object such as a wire, The sealing performance of the valve seat can be improved. As a result, even when a foreign object such as a wire is sandwiched between each valve seat portion and each elastic body of the valve body, each flow path can be reliably closed.
In particular, the dimension from the center of the first pressing part to the outline is 15% to 35% of the dimension from the center to the outline of the first elastic body, and the dimension from the center of the second pressing part to the outline is the second elastic body. By configuring it to be 15% or more and 35% or less of the dimension from the center to the outer shell, the holding performance of holding each elastic body and each valve of each elastic body in a state where foreign matters such as wires are sandwiched between the valve seat portions Both the sealing performance in the seat can be improved.

In the present invention, since the communication means is provided at or near the first valve seat portion, the liquid inflow path and the space portion are in communication with each other when the first elastic body contacts the first valve seat portion. At this time, since the space portion is in communication with the air passage, air flows into the space portion, and further, the air in the space portion flows into the liquid inflow passage through the communication means. As a result, the liquid in the liquid inflow path is pressed by the air flowing in from the space portion (air replacement) and pushed out of the liquid inflow path, and the liquid inflow path can be drained.

In the present invention, since the communication means is a notch groove that opens to the first elastic body when the first elastic body contacts the first valve seat portion, it can be easily formed.
In particular, when a negative pressure is generated in the liquid inflow path, the first elastic body that contacts the first valve seat portion is elastically deformed, and a part of the first elastic body enters the notch groove, so that the liquid inflow path It is possible to prevent the communication performance with the space from increasing more than necessary. In other words, it is possible to drain the liquid inflow path by forming a notch groove, but at this time, air flows from the air path into the liquid inflow path through the space portion, so that the liquid inflow path and the space portion are Negative pressure state. If the liquid inflow path or the space is in a negative pressure state, the liquid may flow into the liquid inflow path from the liquid outflow path, but the first elastic body is elastically deformed and a part thereof enters the notch groove. As a result, a part of the cutout groove is blocked, so that the negative pressure state of the liquid inflow path and the space can be reduced, and the inflow of liquid from the liquid outflow path to the liquid inflow path can be prevented.

  Next, a valve body and a fluid shutoff valve according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the fluid cutoff valve 10 includes a fluid cutoff valve body 12. A space 14 is formed inside the fluid shut-off valve body 12. The fluid shut-off valve main body 12 is formed with a liquid inflow passage 16 that guides the liquid to the space portion 14. The liquid inflow path 16 is in communication with the space portion 14. A cylindrical first valve seat 18 is formed at the end of the liquid inflow channel 16 on the space 14 side. As shown in FIG. 6, a concave notch groove (communication means) 20 is formed at the upper end portion of the first valve seat portion 18. Thereby, even when the first seal rubber (first elastic body, elastic body) 24 of the valve body 22 is in pressure contact with the first valve seat portion 18, the liquid inflow path 16 and the space portion 14 are in communication with each other. .
The notch groove 20 has been described as an example of the communication means. However, the present invention is not limited to this, and for example, a protrusion formed on the surface (upper surface) of the first valve seat portion 18 and in contact with the first seal rubber 24. (Not shown) may be used.
Further, the number of the notch grooves 20 and the protrusions is not limited to one, and a plurality of notches may be formed.
The liquid inflow path 16 is provided with an electromagnetic valve (not shown) to control the liquid flowing through the liquid inflow path 16.

The fluid shut-off valve main body 12 is formed with a liquid outflow path 26 that guides the liquid in the space 14 to the outside. The liquid outflow path 26 communicates with the space portion 14. A hose (not shown) or the like is appropriately attached to the end of the liquid outflow passage 26.
An attachment 28 is attached to the space 14. An opening (air passage) 30 is formed in the attachment 28, and air flows into the space 14 from the opening 30. A cylindrical second valve seat portion 32 is formed at the end of the attachment 28 on the space 14 side. Furthermore, a cylindrical support portion 36 that movably supports a lead shaft 34 of the valve body 22 to be described later is formed at a substantially central portion of the attachment 28.
Here, the opening area of the notch groove 20 is set to be sufficiently smaller than the cross-sectional area of the opening 30.

A valve element 22 is disposed in the space 14. As shown in FIGS. 3 to 5, the valve body 22 includes a rod-shaped lead shaft 34. A disk-shaped flange 38 is integrally formed on the lead shaft 34. Further, the lead shaft 34 is integrally formed with a disk-shaped first pressing portion 40 that sandwiches the first seal rubber 24 between the lower surface of the flange portion 38 and positions the first seal rubber 24. A disc-shaped first seal rubber 24 (first elastic body, elastic body) positioned by the first pressing portion 40 is disposed between the lower surface of the flange portion 38 and the first pressing portion 40. The first pressing portion 40 and the first seal rubber 24 are arranged so as to be concentric. In addition, the lead shaft 34 is integrally formed with a disk-shaped second pressing portion 44 that sandwiches the second seal rubber 42 between the upper surface of the flange portion 38 and positions the second seal rubber 42. A disc-shaped second seal rubber 42 (second elastic body, elastic body) positioned by the second pressing portion 44 is disposed between the upper surface of the flange portion 38 and the second pressing portion 44. The second pressing portion 44 and the second seal rubber 42 are disposed so as to be concentric.
Thus, the valve body 22 has a configuration in which the flange portion 38 is sandwiched between the first seal rubber 24 and the second seal rubber 42.

Here, the dimension L1 from the center O to the outline of the first pressing part 40 is set to be less than 50% of the dimension L2 from the center O to the outline of the first seal rubber 24, and the second pressing part 40 The dimension L3 from the center O to the outline of 44 is set to be less than 50% of the dimension L4 from the center O to the outline of the second seal rubber 42.
In particular, the dimension L1 from the center O to the outline of the first pressing part 40 is preferably 15% or more and 35% or less of the dimension L2 from the center O to the outline of the first seal rubber 24, and the second pressing part 44 is also preferred. The dimension L3 from the center O to the outline of the second seal rubber 42 is preferably 15% to 35% of the dimension L4 from the center O to the outline of the second seal rubber 42.
Furthermore, it is more preferable that the dimension L1 from the center O of the first pressing part 40 to the outline is 25% of the dimension L2 from the center O to the outline of the first seal rubber 24, and the center O of the second pressing part 44 More preferably, the dimension L3 from the outer wall to the outer shell is 25% of the dimension L4 from the center O of the second seal rubber 42 to the outer shell.

  Next, the operation of the valve body 22 and the fluid shutoff valve 10 of this embodiment will be described.

As shown in FIG. 1, in a state where the liquid inflow path 16 is closed by the electromagnetic valve, the valve body 22 is positioned in one direction (downward) due to the gravity acting on the valve body 22, and the first seal rubber 24 is the first seal rubber 24. The liquid inflow path 16 is closed by contacting the valve seat 18. In this state, the space 14 and the liquid inflow path 16 are partitioned by the valve body 22.
In this state, when the liquid inflow path 16 is opened by the electromagnetic valve, the liquid (for example, water) flows through the liquid inflow path 16 toward the valve body 22 and presses the first seal rubber 24. As shown in FIG. 2, when the first seal rubber 24 is pressed from the liquid and the pressure balance inside the space portion 14 changes, the valve body 22 is pushed up from the first valve seat portion 18 to the other direction (upward direction). Then, the second seal rubber 42 eventually comes into contact with the second valve seat portion 32. At this time, the second seal rubber 42 is pressed by the flange 38, and the opening 30 of the attachment 28 is closed. In a state where the opening 30 of the attachment 28 is closed, the liquid that has flowed into the space 14 from the liquid inflow path 16 flows out from the liquid outflow path 26 to the outside.
On the other hand, when the inflow of the liquid from the liquid inflow path 16 to the space portion 14 stops, the valve body 22 moves in one direction (downward) due to a change in the pressure balance inside the space portion 14, and the first seal rubber moves to the first valve. Contact the seat 18. The first seal rubber 24 is pressed by the flange portion 38 to close the liquid inflow path 16. At this time, since the space portion 14 communicates with the opening portion 30 of the attachment 28 and air from the outside flows into the space portion 14 (air replacement), the liquid left in the space portion 14 is liquid. It flows out from the outflow passage 26 to the outside. As a result, no liquid remains in the space 14.
As described above, according to the fluid shutoff valve 10, it is possible to realize a state in which either the liquid inflow path 16 or the opening portion 30 is closed by the valve body 22 disposed in the space portion 14, and the flow of liquid can be achieved. Can be controlled.

  Here, as shown in FIGS. 3 to 5, the first pressing portion 40 is provided concentrically with the first seal rubber 24, and the second pressing portion 44 is provided concentrically with the second seal rubber 42. In addition, since the dimensions L1 and L3 from the center O to the outline of each pressing portion 40 and 44 are configured to be less than 50% of the dimensions L2 and L4 from the center O to the outline of each seal rubber 24 and 42, each seal rubber 24 , 42 is easily elastically deformed in the vicinity of the outer portions (outer edges) of the pressing portions 40, 44 (the degree of freedom in the vicinity of the outer portions (outer edges) of the seal rubbers 24, 42 is increased). For this reason, even when foreign matter such as a wire is sandwiched between the first seal rubber 24 and the first valve seat portion 18 and / or between the second seal rubber 42 and the second valve seat portion 32, each seal rubber 24, Since the vicinity of the outer shell (outer edge) of 42 is elastically deformed so as to enclose foreign substances such as wires, the sealing performance of the valve seat portions 18 and 32 can be improved. As a result, even when foreign matter such as a wire is sandwiched between the valve seat portions 18 and 32 and the seal rubbers 24 and 42, the liquid inflow path 16 and / or the opening portion 30 can be reliably closed. it can.

In particular, the dimension L1 from the center O of the first pressing part 40 to the outline is 15% or more and 35% or less of the dimension L2 from the center O to the outline of the first seal rubber 24, and from the center O of the second pressing part 44 to the outline. The dimension L3 is configured to be 15% or more and 35% or less of the dimension L4 from the center O of the second seal rubber 42 to the outer shell, so that the holding performance for holding the seal rubbers 24, 42, the valve seat portions 18, It is possible to improve both the sealing performance of the valve seat portions 18 and 32 of the seal rubbers 24 and 42 in a state where foreign matters such as wires are sandwiched between the seal rubbers 32 and 42.
On the contrary, if the dimensions L1 and L3 from the center O to the outline of each pressing portion 40 and 44 are less than 15% of the dimensions L2 and L4 from the center O to the outline of each seal rubber 24 and 42, the seal rubbers 24 and 42 are provided. However, since the holding performance for holding the seal rubbers 24 and 42 is lowered, it is difficult to achieve both the holding performance and the sealing performance. It becomes.
Further, when the dimensions L1 and L3 from the center O to the outline of each pressing portion 40 and 44 are larger than 35% of the dimensions L2 and L4 from the center O to the outline of each seal rubber 24 and 42, the seal rubbers 24 and 42, respectively. Although the holding performance of the sealing rubbers 24 and 42 is constrained by the pressing portions 40 and 44 and the vicinity of the outer (outer edge) is difficult to elastically deform (the degree of freedom in the vicinity of the outer (outer edge)). The sealing performance is reduced, and it is difficult to achieve both the holding performance and the sealing performance.
Further, the dimension L1 from the center O of the first pressing portion 40 to the outer contour is 25% of the dimension L2 from the center O to the outer contour of the first seal rubber 24, and the dimension L3 from the center O of the second pressing portion 44 to the outer contour is as follows. By setting it to 25% of the dimension L4 from the center O to the outline of the second seal rubber 42, it is most effective in achieving both of the above two performances.

Further, as shown in FIG. 6, the first valve seat portion 18 is formed with a notch groove 20 that opens to the first seal rubber 24 when the first seal rubber 24 contacts the first valve seat portion 18. When the first seal rubber 24 comes into contact with the first valve seat portion 18, the liquid inflow path 16 and the space portion 14 are in communication with each other. At this time, since the space portion 14 communicates with the opening portion 30, air flows into the space portion 14 from the outside, and further, air in the space portion 14 flows into the liquid inflow path 16 through the notch groove 20. . As a result, the liquid in the liquid inflow path 16 is pressed (air-substituted) by the air that has flowed in from the space portion 14 and pushed out from the liquid inflow path 16, so that the liquid inflow path 16 can be drained.
In particular, when a negative pressure is generated in the liquid inflow path 16, the first seal rubber 24 that contacts the first valve seat portion 18 is elastically deformed, and part of the first seal rubber 24 enters the notch groove 20. It can prevent that the communication performance of the inflow path 16 and the space part 14 increases more than necessary. That is, by forming the notch groove 20, it is possible to drain the liquid inflow path 16, but at this time, air flows into the liquid inflow path 16 from the opening portion 30 through the space portion 14. The inflow path 16 and the space 14 are in a negative pressure state. If the liquid inflow path 16 or the space 14 is in a negative pressure state, the liquid may flow into the liquid inflow path 16 from the liquid outflow path 26, but the first seal rubber 24 is elastically deformed and a part of the notch groove is formed. Since a part of the notch groove 20 is blocked by entering the inside of the liquid tank 20, the negative pressure state of the liquid inflow path 16 and the space portion 14 can be reduced, and the liquid outflow path 26 to the liquid inflow path 16 can be reduced. The inflow of liquid can be prevented.

Further, since the opening area of the notch groove 20 is formed so as to be considerably smaller than the cross-sectional area of the opening portion 30, the pressure decrease in the space portion 14 becomes extremely small, and a negative pressure is generated in the liquid inflow path 16. Even when this occurs, the liquid in the liquid outflow path 26 can be prevented from flowing into the liquid inflow path 16.
As described above, by forming the notch groove 20, it is possible to drain the liquid inflow path 16 while preventing the liquid from flowing into the liquid inflow path 16 from the liquid outflow path 26.

In the above-described embodiment, the valve body 22 and the fluid shut-off valve 10 have been described by taking, as an example, a configuration in which the two seal rubbers 24 and 42 are disposed on the valve body 22, but the present invention is not limited to this, and the second seal rubber 42. It is also possible to adopt a configuration in which only the first seal rubber 24 is disposed.
Moreover, the opening part 30 and the 2nd valve-seat part 32 of the attachment 28 are deleted by setting it as the structure which has arrange | positioned only the seal rubber of either the 1st seal rubber 24 or the 2nd seal rubber 42 to the valve body 22. It is also possible to make various modifications according to the use of the fluid shut-off valve 10.

  In addition, the liquid inflow path 16 and the liquid outflow path 26 have been described by taking the configuration in which the liquid (for example, water) circulates as an example, but the present invention is not limited thereto, and a gas such as a gas may be circulated.

  In addition, the configuration in which the seal rubbers 24 and 42 and the pressing portions 40 and 44 are each formed in a disk shape (circular shape) has been described as an example. Etc.) or any other shape such as a quadrangular shape (a square shape or a rectangular shape).

It is sectional drawing which shows the state which the valve body which comprises the fluid cutoff valve which concerns on one Embodiment of this invention obstruct | occluded the liquid inflow path. It is sectional drawing which shows the state which the valve body which comprises the fluid cutoff valve which concerns on one Embodiment of this invention obstruct | occluded the air path. It is sectional drawing of the valve body which concerns on one Embodiment of this invention. (A) is a front view of the valve body which concerns on one Embodiment of this invention, (B) is a rear view of the valve body which concerns on one Embodiment of this invention. It is a perspective view of a valve element concerning one embodiment of the present invention. (A) is a side view of the 1st valve seat part formed in the fluid cutoff valve concerning one embodiment of the present invention, and (B) is the first formed in the fluid cutoff valve concerning one embodiment of the present invention. It is a top view of 1 valve seat part.

Explanation of symbols

10 Fluid shut-off valve 14 Space 16 Liquid inflow path (flow path)
18 First valve seat (valve seat)
20 Notch groove (communication means)
22 Valve body 24 First seal rubber (first elastic body, elastic body)
26 Liquid outflow channel
30 Opening (air passage)
32 Second valve seat (valve seat)
38 collar 40 first pressing part (pressing part)
42 Second seal rubber (second elastic body, elastic body)
44 Second presser part (presser part)

Claims (2)

A valve body that is in pressure contact with a plurality of valve seats formed at ends of a plurality of flow paths to close the flow paths,
A first elastic body that is in contact with the one valve seat portion, a flange that presses the first elastic body against the valve seat portion, and the first elastic body provided concentrically with the first elastic body. A first pressing portion for positioning the first elastic body sandwiched between the flange portion, and the flange portion between the first elastic body and the other valve seat portion in contact with the first elastic body. A second elastic body that is pressed against the valve seat portion, and a second elastic body that is provided concentrically with the second elastic body and sandwiches the second elastic body between the flange portion and positions the second elastic body. A dimension from the center of the first pressing part to the outline is less than 50% of a dimension from the center of the first elastic body to the outline, and from the center of the second pressing part to the outline A valve body whose dimension is less than 50% of the dimension from the center of the second elastic body to the outer shell,
And a space part in which the valve body is movably disposed, a liquid inflow path for guiding liquid to the space part, a first valve seat part formed at an end of the liquid inflow path, and an inflow into the space part A liquid outflow passage that guides the liquid to the outside, an air passage that guides air to the space, and a second valve seat portion formed at an end of the air passage,
When the valve body moves in one direction in the space portion, the first elastic body comes into contact with the first valve seat portion to close the liquid inflow passage, and the valve body moves the space portion in the other direction. By moving, the second elastic body comes into contact with the second valve seat portion to close the air passage,
In the first valve seat portion or in the vicinity thereof, there is provided communication means for bringing the liquid inflow path and the space portion into communication when the first elastic body comes into contact with the first valve seat portion,
The communication means is a notch groove formed in the first valve seat portion and opened to the first elastic body when the first elastic body contacts the first valve seat portion;
When the negative pressure is generated in the liquid inflow passage, the cutout groove is formed by elastically deforming the first elastic body that contacts the first valve seat portion and entering a part thereof into the cutout groove. A fluid shut-off valve, wherein a part of the notch is closed . The valve body is
The dimension from the center of the first pressing part to the outline is 15% or more and 35% or less of the dimension from the center of the first elastic body to the outline,
2. The fluid cutoff valve according to claim 1, wherein a dimension from a center of the second pressing portion to an outline is 15% to 35% of a dimension from the center of the second elastic body to the outline.

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