JP2017207087A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure capable of releasing excessive pressure in two directions from a primary side to a secondary side and from the secondary side to the primary side with compact constitution of a small number of components.SOLUTION: When a valve body 3 is at a neutral position, an intake 3h and an outlet 3i of a first passage communicate with a primary-side space 2c and an intake 3j and an outlet 3k of a second passage 3g communicate with a secondary-side space 2d. When the valve body 3 moves as excessive pressure is generated on the primary side, the intake 3h of the first passage 3f communicates with the primary-side space 2c and the outlet 3i of the first passage 3f communicates with the secondary-side space 2d. When the valve body 3 moves as excessive pressure is generated on the secondary side, the intake 3j of the second passage 3g communicates with the secondary-side space 2d and the outlet 3k of the second passage 3g communicates with the primary-side space 2c.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve structure.

  The freeze fracture prevention valve described in the following Patent Document 1 includes a relief valve that drains the water volume expanded during freezing to the outside.

  The valve device described in Patent Document 2 below is attached to one end of a valve rod that slides in the axial direction through a valve hole that is located at the boundary between the primary side and the secondary side, and is attached to the valve hole. A relief spring that urges the valve body facing the formed valve seat in the approaching direction, and opens when the force exerted on the valve body by the primary pressure exceeds the load of the relief spring. Relieve pressure from the primary side to the secondary side.

Japanese Utility Model Publication No. 58-45344 JP 2012-73767 A

  In the freeze fracture prevention valve described in Patent Document 1, water corresponding to the volume expansion during freezing is drained from the relief valve to the outside. In order to prevent water from splashing on the peripheral parts of the relief valve, a part for guiding the drainage to the drain is required. Further, since the relief valve for releasing the excessive pressure on the primary side and the relief valve for releasing the excessive pressure on the secondary side are separate, the number of parts increases and the valve becomes large.

  In the valve device described in Patent Document 2, since the pressure can only be released from the primary side to the secondary side, when an excessive pressure is generated due to freezing on the secondary side, the pressure on the secondary side cannot be released. The breakage of the flow path parts cannot be prevented.

  The present invention has been made in order to solve the above-described problems, and has a small size and a small number of components, and the direction from the primary side to the secondary side and the direction from the secondary side to the primary side. An object of the present invention is to provide a valve structure capable of releasing excessive pressure in both directions.

  The valve structure according to the present invention includes a main body having a main flow path having one end communicating with the primary side and the other end communicating with the secondary side, and is movable within the main flow path. A valve body that separates the space from the space on the secondary side, a seal member that seals a gap between the main flow path and the valve body, first biasing means that biases the valve body, and first biasing the valve body Second urging means for urging in a direction opposite to the means, and the valve body includes a first passage having an inlet and an outlet, and a second passage having an inlet and an outlet, and the valve body is in a neutral position. The inlet and outlet of the first passage communicate with the primary side space, the inlet and outlet of the second passage communicate with the secondary side space, and excessive pressure is generated on the primary side, thereby When moved, the inlet of the first passage communicates with the primary space and the outlet of the first passage communicates with the secondary space, When the valve body by an excessive pressure is generated in the following side has moved, in which the outlet of the second passage with the inlet of the second passage communicates with the space of the secondary side is communicated with the space of the primary side.

  According to the valve structure of the present invention, it is possible to relieve excessive pressure in both directions from the primary side to the secondary side and from the secondary side to the primary side with a small size and a small number of components. It becomes.

FIG. 3 is a cross-sectional view showing the valve structure of the first embodiment. FIG. 3 is a cross-sectional view showing the valve structure of the first embodiment. FIG. 3 is a cross-sectional view showing the valve structure of the first embodiment. 6 is a cross-sectional view showing a valve structure of a second embodiment. FIG. 6 is a cross-sectional view showing a valve structure of a second embodiment. FIG.

  Hereinafter, embodiments will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals, and redundant description is simplified or omitted. The present disclosure may include any combination of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
1, FIG. 2, and FIG. 3 are cross-sectional views showing the valve structure 1 of the first embodiment. As shown in FIG. 1, the valve structure 1 of Embodiment 1 includes a main body 2, a valve body 3, a seal member 4, a first coil spring 5, and a second coil spring 6.

  A main flow path is formed inside the main body 2. A valve body 3, a seal member 4, a first coil spring 5 and a second coil spring 6 are accommodated in the main body 2. The main body 2 includes a primary side opening 2a and a secondary side opening 2b. One end of the main channel of the main body 2 communicates with the primary channel 9 via the primary side opening 2a, and the other end of the main channel communicates with the secondary channel 10 via the secondary side opening 2b. Communicate.

  The main body 2 includes a housing 7 and a cap 8. The housing 7 has a bottom 7a at one end and an opening 7b at the other end. The primary side opening 2 a is formed in the bottom 7 a of the housing 7. The housing 7 includes a small diameter portion 7c on the bottom portion 7a side and a large diameter portion 7d on the opening portion 7b side. The inner diameter of the large diameter portion 7d is larger than the inner diameter of the small diameter portion 7c.

  The cap 8 includes a lid portion 8a and an insertion portion 8b. The lid 8 a closes the opening 7 b of the housing 7. The secondary side opening 2b is formed in the lid 8a. The insertion portion 8 b is inserted inside the large diameter portion 7 d of the housing 7. The shape of the insertion portion 8b is cylindrical. The outer diameter of the insertion portion 8b is substantially equal to the inner diameter of the large diameter portion 7d. The inner diameter of the insertion portion 8b is substantially equal to the inner diameter of the small diameter portion 7c.

  The valve structure 1 can be assembled as follows. The valve body 3, the seal member 4, the first coil spring 5 and the second coil spring 6 are assembled inside the housing 7 from the opening 7 b of the housing 7. Thereafter, the cap 8 is attached to the housing 7. In this embodiment, the valve structure 1 can be easily assembled in this manner.

  The valve body 3 is movable inside the main flow path of the main body 2. The valve body 3 may have a cylindrical shape. The valve body 3 is movable in the axial direction. The inside of the main flow path of the main body 2 is separated by a valve body 3 into a primary side space 2c and a secondary side space 2d. The primary space 2c communicates with the primary flow path 9 via the primary opening 2a. The secondary-side space 2d communicates with the secondary-side flow path 10 through the secondary-side opening 2b.

  The valve body 3 includes a first end surface portion 3a, a second end surface portion 3b, and an outer peripheral portion 3c. The first end surface portion 3a faces the primary space 2c. The second end surface part 3b faces the space 2d on the secondary side. The outer diameter of the outer peripheral portion 3 c is slightly smaller than the inner diameter of the small diameter portion 7 c of the housing 7 and the inner diameter of the insertion portion 8 b of the cap 8.

  The seal member 4 seals a gap between the main flow path of the main body 2 and the valve body 3. The seal member 4 may be an O-ring. The inner peripheral part of the sealing member 4 and the outer peripheral part 3c of the valve body 3 are in contact with each other. When the valve body 3 moves, the valve body 3 slides with respect to the seal member 4. The seal member 4 is held between the housing 7 and the cap 8. The seal member 4 is held by the seal member 4 being sandwiched between the stepped surface at the boundary between the small diameter portion 7 c and the large diameter portion 7 d of the housing 7 and the end surface of the insertion portion 8 b of the cap 8. If it is this Embodiment, such a structure can hold | maintain the sealing member 4 in an appropriate position with a simple structure.

  The first coil spring 5 is located between the bottom 7 a of the housing 7 and the valve body 3. The first coil spring 5 is in a compressed state. The first coil spring 5 biases the valve body 3 in its axial direction (upward in FIG. 1). The first coil spring 5 biases the valve body 3 in a direction from the primary side space 2c toward the secondary side space 2d. The first coil spring 5 is an example of first urging means that urges the valve body 3. The first urging means is not limited to the first coil spring 5 and may be another elastic member such as a rubber member, for example.

  The valve body 3 includes a holding portion 3 d that holds the first coil spring 5. By inserting the holding portion 3d inside the one end of the first coil spring 5, it is possible to reliably prevent the displacement of the one end portion of the first coil spring 5 in the radial direction.

  The housing 7 includes a holding portion 7 e that holds the first coil spring 5. By inserting the holding portion 7e inside the other end of the first coil spring 5, it is possible to reliably prevent the radial displacement of the other end portion of the first coil spring 5.

  The second coil spring 6 is located between the lid portion 8 a of the cap 8 and the valve body 3. The second coil spring 6 is in a compressed state. The second coil spring 6 biases the valve body 3 in its axial direction (downward in FIG. 1). The second coil spring 6 biases the valve body 3 in a direction from the secondary side space 2d toward the primary side space 2c. The second coil spring 6 is an example of a second urging unit that urges the valve body 3 in a direction opposite to the first urging unit. The second urging means is not limited to the second coil spring 6, and for example, another elastic member such as a rubber member may be used.

  The valve body 3 includes a holding portion 3 e that holds the second coil spring 6. By inserting the holding portion 3e inside the one end of the second coil spring 6, it is possible to reliably prevent the radial displacement of the one end portion of the second coil spring 6.

  The cap 8 includes a holding portion 8 c that holds the second coil spring 6. By inserting the holding portion 8 c inside the other end of the second coil spring 6, it is possible to reliably prevent the displacement of the other end portion of the second coil spring 6 in the radial direction.

  The valve body 3 includes a first passage 3f and a second passage 3g. The first passage 3 f and the second passage 3 g are formed inside the valve body 3. The first passage 3f has an inlet 3h and an outlet 3i. The inlet 3h of the first passage 3f opens to the first end surface portion 3a. The outlet 3i of the first passage 3f opens to the outer peripheral portion 3c. The second passage 3g has an inlet 3j and an outlet 3k. The inlet 3j of the second passage 3g opens to the second end surface portion 3b. The outlet 3k of the second passage 3g opens to the outer peripheral portion 3c.

  In the present embodiment, the following effects can be obtained. Since the inlet 3h of the first passage 3f opens to the first end surface portion 3a, the fluid in the primary-side space 2c can smoothly flow into the inlet 3h. Since the inlet 3j of the second passage 3g opens to the second end surface portion 3b, the fluid in the secondary-side space 2d can smoothly flow into the inlet 3j. By opening the outlet 3i of the first passage 3f and the outlet 3k of the second passage 3g to the outer peripheral portion 3c, it is possible to release excessive pressure through the first passage 3f or the second passage 3g as described later. Become. When the seal member 4 is in contact with the outer peripheral portion 3c of the valve body 3, the radial position of the valve body 3 can be reliably held at an appropriate position. Since the first coil spring 5 and the second coil spring 6 urge the valve body 3 in the axial direction of the valve body 3, the axial position of the valve body 3 can be appropriately controlled.

  For example, an excessive pressure may be generated in the primary side channel 9 or the secondary side channel 10 due to, for example, volume expansion of the fluid due to freezing. When no excessive pressure is generated in either the primary side flow path 9 or the secondary side flow path 10, the valve element 3 is in the neutral position shown in FIG. When the valve body 3 is in the neutral position, the following occurs. Both the inlet 3h and the outlet 3i of the first passage 3f communicate with the primary space 2c. For this reason, the fluid does not flow through the first passage 3f. Both the inlet 3j and the outlet 3k of the second passage 3g communicate with the secondary space 2d. For this reason, the fluid does not flow through the second passage 3g. A space between the primary side flow path 9 and the secondary side flow path 10 is closed by the valve body 3 and the seal member 4. That is, the valve structure 1 blocks between the primary side flow path 9 and the secondary side flow path 10.

  FIG. 2 shows a state in which the valve body 3 has moved due to excessive pressure being generated in the primary side flow path 9. When an excessive pressure is generated in the primary channel 9, the following occurs. The pressure in the primary side space 2c rises by the pressure in the primary side flow path 9 being transmitted to the primary side space 2c through the primary side opening 2a. The sum of the force represented by the product of the pressure in the primary space 2c and the pressure receiving area of the valve body 3 and the biasing force of the first coil spring 5 is the pressure in the secondary space 2d and the pressure received by the valve body 3. As a result of becoming larger than the sum of the force represented by the product of the area and the urging force of the second coil spring 6, the valve body 3 moves in a direction from the primary side space 2c toward the secondary side space 2d. Compared to when the valve body 3 is in the neutral position, the primary space 2c is enlarged and the secondary space 2d is reduced. As the valve body 3 moves, the first coil spring 5 extends and the biasing force decreases, and the second coil spring 6 contracts and the biasing force increases. The sum of the force expressed by the product of the pressure in the primary space 2c and the pressure receiving area of the valve body 3 and the biasing force of the first coil spring 5, the pressure in the secondary space 2d, and the pressure received by the valve body 3 The valve body 3 stops at a position where the force represented by the product of the area and the sum of the biasing force of the second coil spring 6 are balanced. Due to the movement of the valve body 3, the outlet 3i of the first passage 3f passes through the contact portion with the seal member 4 and becomes a position communicating with the secondary space 2d. The inlet 3h of the first passage 3f communicates with the primary space 2c. The fluid in the primary space 2c flows into the first passage 3f from the inlet 3h, and flows out from the outlet 3i to the secondary space 2d. In this way, the fluid flows from the primary side flow path 9 to the secondary side flow path 10, whereby the pressure of the primary side flow path 9 decreases. When the excessive pressure is eliminated in the primary flow path 9, the valve body 3 returns to the neutral position by the urging force of the second coil spring 6.

  In the present embodiment, for example, when an excessive pressure is generated in the primary flow path 9 due to, for example, volume expansion of the fluid due to freezing, the primary flow path 9 to the secondary flow path 10 as described above. Pressure can be relieved. For this reason, it is possible to reliably suppress the damage to the piping due to the volume expansion of the fluid.

  When the valve body 3 moves due to excessive pressure generated in the primary flow path 9, the inner wall surface of the insertion portion 8 b of the cap 8, that is, the protrusion 8 d protruding from the inner wall surface of the main flow path, and the outer periphery of the valve body 3 When the protrusion 3m formed on the portion 3c comes into contact, the radial movement of the valve body 3 is restricted. Thereby, the following effects are acquired. When the valve body 3 moves, it can prevent that the outer peripheral part 3c of the valve body 3 contacts the inner wall surface of the insertion part 8b of the cap 8. FIG. For this reason, it can prevent reliably that the outer peripheral part 3c of the valve body 3 which contacts the seal member 4 is damaged.

  FIG. 3 shows a state when the valve body 3 is moved due to an excessive pressure generated in the secondary side flow path 10. When an excessive pressure is generated in the secondary channel 10, the following occurs. The pressure of the secondary side flow path 10 is transmitted to the secondary side space 2d through the secondary side opening 2b, whereby the pressure of the secondary side space 2d increases. The sum of the force represented by the product of the pressure in the secondary space 2d and the pressure receiving area of the valve body 3 and the biasing force of the second coil spring 6 is the pressure in the primary space 2c and the pressure received by the valve body 3. As a result of becoming larger than the sum of the force represented by the product of the area and the urging force of the first coil spring 5, the valve body 3 moves in the direction from the secondary space 2d to the primary space 2c. Compared to when the valve body 3 is in the neutral position, the primary space 2c is reduced and the secondary space 2d is enlarged. As the valve body 3 moves, the first coil spring 5 contracts to increase the biasing force, and the second coil spring 6 extends to decrease the biasing force. The sum of the force expressed by the product of the pressure in the primary space 2c and the pressure receiving area of the valve body 3 and the biasing force of the first coil spring 5, the pressure in the secondary space 2d, and the pressure received by the valve body 3 The valve body 3 stops at a position where the force represented by the product of the area and the sum of the biasing force of the second coil spring 6 are balanced. By the movement of the valve body 3, the outlet 3k of the second passage 3g passes through the contact portion with the seal member 4 and becomes a position communicating with the primary space 2c. The inlet 3j of the second passage 3g communicates with the secondary space 2d. The fluid in the secondary-side space 2d flows into the second passage 3g from the inlet 3j, and flows out from the outlet 3k into the primary-side space 2c. In this way, the fluid flows from the secondary side flow path 10 to the primary side flow path 9, whereby the pressure of the secondary side flow path 10 decreases. When the excessive pressure is eliminated in the secondary flow path 10, the valve body 3 returns to the neutral position by the urging force of the first coil spring 5.

  In the present embodiment, for example, when an excessive pressure is generated in the secondary side flow path 10 due to, for example, volume expansion of the fluid due to freezing, the secondary side flow path 10 to the primary side flow path 9 as described above. Can relieve pressure. For this reason, it is possible to reliably suppress the damage to the piping due to the volume expansion of the fluid.

  When the valve body 3 is moved due to excessive pressure generated in the secondary side flow path 10, the inner wall surface of the small diameter portion 7 c of the housing 7, that is, the protrusion 7 f protruding from the inner wall surface of the main flow path, The movement of the valve body 3 in the radial direction is restricted by contact with the protrusion 3n formed on the outer peripheral portion 3c. Thereby, the following effects are acquired. When the valve body 3 moves, it can prevent that the outer peripheral part 3c of the valve body 3 contacts the inner wall surface of the small diameter part 7c of the housing 7. FIG. For this reason, it can prevent reliably that the outer peripheral part 3c of the valve body 3 which contacts the seal member 4 is damaged.

  According to the valve structure 1 of the present embodiment described above, the direction from the primary flow path 9 to the secondary flow path 10 and the secondary flow path 10 to the primary side are small and have a small number of components. An excessive pressure can be released in both directions with respect to the flow path 9.

  The valve structure 1 of the present embodiment may be used as a primary pressure adjustment valve that adjusts the pressure of the primary side flow path 9. The valve structure 1 of the present embodiment may be used as a secondary pressure adjustment valve that adjusts the pressure of the secondary side flow path 10. The valve structure 1 of the present embodiment may be used in parallel with another valve (not shown) such as a pressure reducing valve or a check valve.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG. 4 and FIG. 5. The description will focus on the differences from the first embodiment, and the description of the same or corresponding parts will be simplified or simplified. Omitted.

  4 and 5 are cross-sectional views showing the valve structure 1A of the second embodiment. FIG. 4 shows a state when the valve body 3 moves due to excessive pressure generated in the primary side flow path 9. As shown in FIG. 4, in the valve structure 1A of the second embodiment, when the valve body 3 moves due to excessive pressure generated in the primary side flow path 9, the holding portion 3e included in the valve body 3; The stop position of the valve body 3 is regulated by contact with the holding portion 8c included in the cap 8 of the main body 2. That is, the movement of the valve body 3 in the axial direction stops at a position where the holding portion 3e of the valve body 3 and the holding portion 8c of the cap 8 are in contact with each other. Thereby, the position of the valve body 3 when an excessive pressure is generated in the primary side flow path 9 can be reliably positioned by an appropriate position.

  FIG. 5 shows a state in which the valve body 3 has moved due to excessive pressure being generated in the secondary side flow path 10. As shown in FIG. 5, in the valve structure 1 </ b> A of the second embodiment, when the valve body 3 is moved due to excessive pressure generated in the primary side flow path 9, the holding portion 3 d provided in the valve body 3, The stop position of the valve body 3 is regulated by contact with the holding portion 7e included in the housing 7 of the main body 2. That is, the movement of the valve body 3 in the axial direction stops at a position where the holding portion 3d of the valve body 3 and the holding portion 7e of the housing 7 are in contact with each other. Thereby, the position of the valve body 3 when an excessive pressure is generated in the secondary side flow path 10 can be reliably positioned by an appropriate position.

1, 1A valve structure, 2 body, 2a primary side opening, 2b secondary side opening, 2c primary side space, 2d secondary side space, 3 valve body, 3a first end face part, 3b second end face part 3c outer periphery, 3d, 3e holding part, 3f first passage, 3g second passage, 3h inlet, 3i outlet, 3j inlet, 3k outlet, 3m, 3n protrusion, 4 seal member, 7 housing, 7a bottom, 7b Opening, 7c Small diameter part, 7d Large diameter part, 7e Holding part, 7f Protruding part, 8 Cap, 8a Lid part, 8b Inserting part, 8c Holding part, 8d Protruding part, 9 Primary flow path, 10 Secondary side flow Road

Claims (7)

A main body having a main flow path with one end communicating with the primary side and the other end communicating with the secondary side;
A valve body that is movable within the main flow path and separates the interior of the main flow path into the primary side space and the secondary side space;
A seal member for sealing a gap between the main flow path and the valve body;
First biasing means for biasing the valve body;
Second urging means for urging the valve body in a direction opposite to the first urging means;
With
The valve body includes a first passage having an inlet and an outlet, and a second passage having an inlet and an outlet,
When the valve body is in a neutral position, the inlet and the outlet of the first passage communicate with the primary space, and the inlet and the outlet of the second passage communicate with the secondary space. ,
When the valve element moves due to excessive pressure generated on the primary side, the inlet of the first passage communicates with the primary side space, and the outlet of the first passage becomes the secondary side space. Communicate with
When the valve element moves due to excessive pressure generated on the secondary side, the inlet of the second passage communicates with the space on the secondary side and the outlet of the second passage is on the primary side. Valve structure that communicates with space. The valve body includes a first end surface portion facing the space on the primary side, a second end surface portion facing the space on the secondary side, and an outer peripheral portion,
The inlet of the first passage opens into the first end surface portion;
The inlet of the second passage opens to the second end face;
The valve structure according to claim 1, wherein the outlet of the first passage and the outlet of the second passage are open to the outer peripheral portion. The seal member contacts the outer periphery of the valve body;
3. The valve structure according to claim 1, wherein the first urging unit and the second urging unit urge the valve body in an axial direction of the valve body. Protruding part protruding from the inner wall surface of the main flow path,
Claim: When the valve body moves due to excessive pressure generated on the primary side or the secondary side, the radial movement of the valve body is restricted by the protrusion contacting the valve body. The valve structure according to any one of claims 1 to 3.   The valve according to any one of claims 1 to 4, wherein at least one of the main body and the valve body includes a holding portion that holds at least one of the first urging means and the second urging means. Construction. The main body includes a holding portion that holds at least one of the first urging means and the second urging means,
The valve body includes a holding portion that holds at least one of the first urging means and the second urging means,
When the valve body moves due to the occurrence of excessive pressure on the primary side or the secondary side, the holding portion provided in the valve body and the holding portion provided in the main body come into contact with each other, The valve structure according to any one of claims 1 to 4, wherein a stop position of the valve body is regulated. The main body includes a housing having an opening, and a cap having a portion that closes the opening.
The valve structure according to any one of claims 1 to 6, wherein the seal member is held between the housing and the cap.

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