JP6685077B2 - Pressure gauge attachment / detachment - Google Patents

Description

The present invention relates to a pressure gauge attachment / detachment joint.

A pressure gauge detachable joint attached to a fluid system, comprising a casing, a valve body that opens and closes an internal flow path of the casing, a spring that urges the valve body in a valve closing direction, and a valve shaft that extends from the valve body. However, a pressure gauge attachment / detachment in which a female screw is formed at the valve shaft side end of the casing has been conventionally used.
When connecting the pressure gauge to the joint, the seal tape is wrapped around the male screw formed on the mounting portion of the pressure gauge, and then the mounting portion is screwed into the female screw of the joint. The end of the mounting part comes into contact with the valve shaft of the joint, pushes the valve element in the valve opening direction against the biasing force of the spring, and opens the casing internal flow path to connect the fluid system and the pressure sensitive part of the pressure gauge. Let The gap between the joint between the joint and the pressure gauge mounting portion, that is, the gap between the screwed portions, is closed by the seal tape.

The conventional pressure gauge attachment / detachment described above requires a sealing tape to be wound around the male screw of the pressure gauge mounting portion when connecting the pressure gauge, which causes a problem that it takes time to mount the pressure gauge. Further, there is a problem that the fluid leaks from the connection portion if the sealing tape is not completely wound.
The present invention has been made in view of the above problems, and provides a pressure gauge attachment / detachment that does not require time and effort for mounting a pressure gauge and that does not allow fluid to leak from a connection portion between the pressure gauge and the joint. With the goal.

In order to solve the above problems, in the present invention, a pressure gauge detachable joint attached to a fluid system, a cylindrical casing, a cylindrical valve body fitted to the cylindrical casing so as to be movable in the longitudinal direction, An internal flow having a spring that abuts on one end of the valve body in the longitudinal direction and biases the valve body in the valve closing direction, one end of which opens on the circumferential side surface of the valve body and the other end of which opens on the other end in the longitudinal direction of the valve body. A passage is formed in the valve body, and the valve body has a first side surface seal disposed closer to the one end of the valve body than the one end opening of the valve body internal flow passage, and the valve body than the one side opening of the valve body internal flow passage. A second side face seal disposed near the other end of the body and an end face seal disposed on the end face of the other end of the valve body are provided. The end face seal includes the end portion of the pressure gauge mounting portion and the valve body. The second side seal closes the gap between the contact portion with the other end, and the second side surface seal is located in front of the valve body rather than the one end opening of the valve body internal flow path. The gap between the fitting portion between the valve body portion closer to the other end and the casing is closed, and the first side surface seal is formed between the valve body portion closer to the one end than the one end opening of the valve body internal flow passage and the casing. A pressure gauge characterized by opening and closing a gap in the fitting portion, closing the end face seal prior to opening the first side seal, and closing the first side seal prior to closing the end face seal. Provide a detachable joint.
In the pressure gauge attachment / detachment according to the present invention, the end face seal provided at the other end of the valve body closes the gap between the end portion of the mounting portion of the pressure gauge and the contact portion at the other end of the valve body, and the second side surface seal is the valve. Since the gap between the fitting part of the body and the casing is closed, the gap between the joint and the connection part of the pressure gauge can be closed without using sealing tape, and the pressure gauge installation work is troublesome. It does not hang. Further, since the gap between the joint and the pressure gauge mounting portion is closed by the end face seal and the side face seal, there is no risk of fluid leakage from the joint between the pressure gauge and the joint. Since the closing action of the end face seal precedes the opening action of the first side face seal, the fluid flows out from the gap between the contact part between the end part of the pressure gauge mounting part and the other end of the valve body during the pressure gauge mounting work. There is no fear. Since the closing operation of the first side seal precedes the closing release operation of the end face seal, the fluid flows from the gap between the contact portion between the end portion of the pressure gauge mounting portion and the other end of the valve body during the pressure gauge removing operation. There is no fear of leakage.

In a preferred aspect of the present invention, the pressure gauge attachment / detachment has one end fixed to the fluid system and the other end screwed with a pressure gauge mounting portion, and the large inner diameter portion closer to one end and the other inner end portion closer to the large inner diameter portion. A cylindrical casing having a small inner diameter part, and one end directed to one end of the casing and the other end directed to the other end of the casing to be fitted into the casing and movable within a predetermined length region of the casing. A cylindrical valve body and a spring that is housed in the casing and engages with the one end of the valve body to urge the valve body toward the other end of the casing. The valve body is formed with an internal flow path having the other end opening at the other end of the valve body, and the valve body is fitted with a portion of the valve body closer to one end than the one end opening of the internal flow path and the casing small inner diameter portion. A first side seal that opens and closes a gap at the joint, and the one end of the internal flow path A second side seal that closes the gap between the fitting portion between the valve body portion closer to the other end than the mouth and the casing small inner diameter portion, and the other end of the valve body and the end portion of the pressure gauge mounting portion In the state where the pressure gauge is not attached, the valve body that receives the urging force of the spring moves to the end of the movable region on the other end side of the casing to move the first side surface. The seal and the second side surface seal face the inner peripheral side surface of the small inner diameter portion of the casing, close the gap between the fitting portion of the valve body and the small inner diameter portion of the casing to shut off the fluid system from the external space, and mount the pressure gauge. When the valve body is moved toward the one end of the casing while the end face seal is compressed against the biasing force of the spring while the valve body is moved toward the one end of the casing, the end portion of the pressure gauge mounting portion is the other end of the valve body. And the gap of the contact portion is closed by the end face seal, and then, The two-side seal faces the inner peripheral side surface of the small inner diameter portion of the casing, and closes the gap between the fitting portion between the valve inner body portion closer to the other end of the valve body than the one end opening of the internal flow passage and the small inner diameter portion of the casing. However, the first side surface seal faces the inner peripheral side surface of the large inner diameter portion of the casing and forms a gap between the fitting portion between the valve body portion closer to one end of the valve body than the one end opening of the internal flow passage and the casing small inner diameter portion. The fluid system and the pressure-sensitive portion of the pressure gauge communicate with each other through the opened gap and the internal passage of the valve body.
According to the above configuration, the end face seal provided at the other end of the valve body closes the gap between the contact portion between the end of the mounting portion of the pressure gauge and the other end of the valve body, and the second side face seal separates the valve body and the casing. Since the gap of the fitting part is closed, the gap of the connecting part between the joint and the pressure gauge mounting part can be closed without using a sealing tape, and the pressure gauge mounting work is easy. Further, since the gap between the joint and the pressure gauge mounting portion is closed by the end face seal and the second side seal, there is no risk of fluid leaking from the joint portion between the pressure gauge and the joint.

In a preferred aspect of the present invention, the valve body has a first portion having a first side surface seal and a second portion having a second side surface seal and an end surface seal which are separate from the first portion, The two parts are fitted to the first part so as to be slidably rotatable about the central axis, and the fitting part forms a part of the valve body internal flow path.
With the above configuration, when the mounting part of the pressure gauge is screwed into the other end of the casing and the valve body is pushed in the valve opening direction, the entire valve body is entrained in the mounting part and the spring is twisted and operation is unstable. It is possible to prevent the occurrence of the situation.

It is sectional drawing before the pressure gauge connection of the pressure gauge attachment / detachment which concerns on the Example of this invention. FIG. 4 is a cross-sectional view of the pressure gauge detachable joint according to the embodiment of the present invention immediately after the start of pressure gauge connection. It is sectional drawing at the time of completion of pressure gauge connection of the pressure gauge attachment / detachment which concerns on the Example of this invention.

As shown in FIG. 1, the pressure gauge attachment / detachment joint 1 attached to the fluid system has one end 2a fixed to a fluid system (not shown), the other end 2b into which the attachment portion 100a of the pressure gauge 100 is screwed, and the one end 2a. It is provided with a cylindrical casing 2 having a large inner diameter portion 2c closer to it and a smaller inner diameter portion 2d closer to the other end 2b than the large inner diameter portion 2c. The large inner diameter portion 2c and the small inner diameter portion 2d are connected by a truncated cone-shaped slope 2e.
The joint 1 is housed in the casing 2 with one end 3a directed to the one end 2a of the casing 2 and the other end 3b directed to the other end 2b of the casing 2, and is screwed and fixed in the vicinity of the other end 2b of the casing 2. A cylindrical valve body 3 movable in the longitudinal direction is provided within a predetermined length region L of the casing 2 formed between the retaining member 4 and the annular end portion 2f of the large inner diameter portion 2c on the one end 2a side. . The valve body 3 has a first portion 3c near one end 3a and a second portion 3d near the other end 3b. The first portion 3c is a columnar body having a large diameter portion 3c ₁ near one end 3a and a small diameter portion 3c ₂ near the other end 3b. Longitudinal grooves 3c ₃ of the peripheral side surface (s) of the small-diameter portion 3c ₂ is formed. The second portion 3d is a cylindrical body having a large-diameter central hole 3d ₁ near one end 3a and a small-diameter central hole 3d ₂ near the other end 3b. The large-diameter central hole 3d ₁ of the second portion 3d is externally fitted to the small-diameter portion 3c ₂ of the first portion 3c so as to be rotatable and slidable about the central axis. The plurality of protrusions 3d ₃ discretely formed on the end surface on the one end 3a side of the second portion 3d abut on the end surface on the other end 3b side of the large diameter portion 3c ₁ of the first portion 3c, so that the second portion 3d A gap S is formed between the end surface on the one end 3a side and the end surface on the other end 3b side of the large diameter portion 3c1 of the _first portion 3c. Portion extending in the large diameter portion 3c in the _first casing small diameter portion 2d of the first portion is fitted floating across a small annular gap in the small diameter portion 2d, a first portion of the large diameter portion 3c ₁ The portion extending inside the casing large inner diameter portion 2c is loosely fitted to the large inner diameter portion 2c with an annular gap, and the portion extending inside the casing small inner diameter portion 2d of the second portion 3d is the small inner diameter portion 2d. It is slidingly fitted to.
The joint 1 includes a spring 5 housed in the casing 2 and engaged with the one end 3 a of the valve body 3 to urge the valve body 3 toward the other end 2 b of the cylindrical casing 2.
A gap S, a plurality of vertical grooves 3c ₃ of a fitting portion between the second portion 3d and the first portion 3c of the valve body 3, and an end portion of the large diameter hole 3d ₁ of the second portion 3d on the side of the other end 3b. By the small diameter hole 3d ₂ of the second portion 3d, the valve body internal flow passage 6 having one end 6a opened on the peripheral side surface near the one end 3a of the valve body 3 and the other end 6b opened on the other end 3b of the valve body 3 is formed. Has been formed.
The valve body 3 is formed by an O-ring that opens and closes a gap of a loose fitting portion with the casing small inner diameter portion 2d of the first partial large diameter portion 3c ₁ closer to the one end 3a than the one end opening 6a of the valve inner passage. O-ring that closes the gap between the first side seal 7a and the small inner diameter portion 2d of the casing of the second portion 3d that is closer to the other end 3b than the one end opening 6a of the valve body internal flow path. And a second side face seal 7b formed by the above, and an end face seal 7c formed by an O ring that closes the gap between the other end 3b of the valve body 3 and the end of the pressure gauge mounting portion 100a. is doing.

The operation of the pressure gauge detachable joint 1 will be described.
In the state where the pressure gauge 100 is not attached, as shown in FIG. 1, the valve body 3 which receives the biasing force of the spring 5 moves to the casing other end 2b side end portion of the movable region L, and becomes the retainer 4. Abut and stop. The first side surface seal 7a and the second side surface seal 7b face the inner peripheral side surface of the small inner diameter portion 2d of the casing, and close the gap between the valve body 3 and the casing small inner diameter portion 2d to close the fluid system to the outside. It is cut off from the space.
When the mounting portion 100a of the pressure gauge is screwed into the other end 2b of the casing, the end portion of the mounting portion 100a of the pressure gauge contacts the end face seal 7c, as shown in FIG. The first side surface seal 7a and the second side surface seal 7b face the inner peripheral side surface of the small inner diameter portion 2d of the casing, and close the gap between the valve body 3 and the casing small inner diameter portion 2d to close the fluid system. It is cut off from the outside space.
When the mounting portion 100a of the pressure gauge is further screwed into the other end 2b of the casing, the mounting portion 100a presses the end face seal 7c against the urging force of the spring 5 and compresses the valve body 3 toward the casing one end 2a. To move. As shown in FIG. 3, the end of the mounting portion 100a comes into contact with the retaining member 4 to stop the mounting portion 100a, and the valve body 3 also stops. As the mounting portion 100a is screwed into the other end 2b of the casing, the end portion of the mounting portion 100a abuts on the other end 3b of the valve body 3 and the gap between the abutting portions is closed by the end face seal 7c. Then, the second side surface seal 7b faces the inner peripheral side surface of the small inner diameter portion 2d of the casing, and the second portion 3d of the valve body 3 closer to the other end 3b than the one end opening 6a of the internal flow path and the casing small inner diameter. Although the gap of the sliding fitting portion with the portion 2d continues to be closed, the first side surface seal 7a faces the inner peripheral side surface of the large inner diameter portion 2c of the casing and is closer to the one end 3a than the one end opening 6a of the internal flow passage. The gap of the loose fitting portion between the first portion large diameter portion 3c _{1 and} the casing small diameter portion 2d is opened. As a result, the fluid system and the pressure-sensitive portion of the pressure gauge 100 communicate with each other through the opened gap and the internal flow path 6 of the valve body.
By the above, the connection work between the pressure gauge 100 and the pressure gauge attachment / detachment joint 1, and the connection work between the pressure gauge 100 and the fluid system is completed. ,

When the pressure gauge 100 is detached from the fluid system, the pressure gauge 100 is rotated in the opposite direction to that at the time of connection, and the mounting portion 100a is detached from the casing 2 of the pressure gauge detachable joint 1. At this time, the valve body 3 biased by the spring 5 moves toward the other end 2b of the cane 2, and the first side surface seal 7a is guided from the large inner diameter portion 2c to the inclined surface 2e to the small inner diameter portion 2d, A clearance is formed between the small inner diameter portion 2d of the casing and the loose fitting portion of the first partial large diameter portion 3c ₁ of the inner flow path, which is closer to the one end 3a than the one end opening 6a, and the casing small inner diameter portion 2d. Close. The second side surface seal 7b faces the inner peripheral side surface of the small inner diameter portion 2d of the casing and closes the gap of the sliding fitting portion between the second portion 3d of the valve body 3 and the casing small inner diameter portion 2d. Next, the valve element 3 reaches the end of the movable area L on the side of the other end 2b of the casing, abuts on the retainer 4, and stops. Then, the closing of the gap between the contact portion between the end of the pressure gauge mounting portion 100a and the other end 3b of the valve body 3 by the end face seal 7c is released, and finally the mounting portion 100a is detached from the pressure gauge detachable joint 1. And then disengage from the fluid system. The pressure gauge detachable joint 1 returns to the state shown in FIG.

In the pressure gauge attachment / detachment joint 1, the end face seal 7c of the other end 3b of the valve body closes the gap between the end portion of the mounting portion 100a of the pressure gauge and the other end 3b of the valve body, and the second side face seal is formed. Since 7b closes the gap in the sliding fitting portion between the second portion 3d of the valve body 3 and the casing, the gap in the connecting portion between the joint 1 and the pressure gauge mounting portion 100a is closed without using a sealing tape. The pressure gauge can be installed without any trouble. Further, since the gap between the joint 1 and the pressure gauge mounting portion 100a is closed by the end face seal 7c and the second side face seal 7b, fluid leaks from the joint portion between the pressure gauge mounting portion 100a and the joint 1. There is no danger of
In the pressure gauge detachable joint 1, since the closing operation of the end face seal 7c precedes the opening action of the first side face seal 7a, the end portion of the pressure gauge attaching portion 100a and the other end 3b of the valve body 3 during the pressure gauge attaching operation. There is no possibility that the fluid will flow out from the gap between the abutting part and. Since the closing operation of the first side surface seal 7a precedes the closing release operation of the end surface seal 7c, the contact portion between the end portion 100a of the pressure gauge mounting portion and the other end 3b of the valve body 3 is removed during the pressure gauge removing operation. There is no risk of fluid flowing out from the gap.
In the pressure gauge detachable joint 1, the valve body 3 includes a first portion 3c having a first side surface seal 7a, and a second portion having a second side surface seal 7b and an end surface seal 7c which are separate from the first portion 3c. 3d and the second portion 3d is fitted into the first portion 3c so as to be rotatable and slidable about the central axis, the mounting portion 100a of the pressure gauge is screwed into the other end 2b of the casing, and the valve body is inserted. When pushing 3 in the valve opening direction, even if the second portion 3d of the valve body is rotated to the mounting portion 100a, the situation in which the entire valve body 3 including the first portion 3c is rotated to the mounting portion 100a is prevented, It is prevented that the spring 5 is twisted and the operation becomes unstable.

The valve body 3 may be an integrated structure. In this case, the small-diameter center hole 3d ₂ is extended to the longitudinal position between the first side surface seal 7a and the second side surface seal 7b, and the first side surface seal 7a and the second side surface seal 7b on the outer peripheral side surface of the valve body 3 are separated. It is sufficient to form a small hole in the valve body 3 that extends in the radial direction from the portion extending in the middle to the small diameter center hole 3d ₂ . In this case, it is desirable to dispose a lubricating member at the contact portion for promoting relative sliding of the contact portion between the spring 5 and the one end 3a of the valve body 3.
Instead of discretely forming a plurality of protrusions 3d ₃ on the end face of the second portion 3d on the one end 3a side, a plurality of protrusions are discrete on the end face of the large diameter portion 3c ₁ of the _first portion 3c on the other end 3b side. It may be formed in.
The portion of the large diameter portion 3c ₁ of the first portion extending in the small inner diameter portion 2d of the casing is slidably fitted to the small inner diameter portion 2d, and the end portion of the mounting portion 100a abuts the retainer 4 to secure the mounting portion. When 100a stops and the valve body 3 stops, the portion extending in the casing small inner diameter portion 2d of the large diameter portion 3c ₁ of the first portion includes a truncated cone-shaped space formed by the slope 2e. You may comprise so that it may extend in the large inner diameter part 2c. The fluid system and the pressure sensitive portion of the pressure gauge 100 communicate with each other via the internal flow path 6.
The connection between the pressure gauge mounting portion 100a and the other end 2b of the casing is not limited to screwing. A known one-touch connection may be used.

  INDUSTRIAL APPLICABILITY The present invention is widely applicable to pressure gauge attachment / detachment joints.

1 Pressure gauge attachment / detachment joint 2 Casing 3 Valve body 4 Retainer 5 Spring 6 Valve body internal flow path 7a First side face seal 7b Second side face seal 7c End face seal 100 Pressure gauge 100a Mounting part

Claims (3)

A pressure gauge attachable / detachable joint attached to a fluid system, comprising a cylindrical casing, a cylindrical valve body fitted in the cylindrical casing so as to be movable in the longitudinal direction, and abutting one end of the valve body in the longitudinal direction to form the valve body. An internal flow path is formed in the valve body, the internal flow path having a spring for urging the valve body in the valve closing direction, one end of which opens on the peripheral side surface of the valve body and the other end of which opens on the other end in the longitudinal direction of the valve body. A first side surface seal disposed closer to the one end of the valve body than the one end opening of the body internal flow passage, and a second side seal disposed closer to the other end of the valve body than the one end opening of the valve body internal flow passage. A side seal and an end face seal disposed on the end face of the other end of the valve body are provided, and the end face seal closes the gap between the end portion of the pressure gauge mounting portion and the other end of the valve body. The second side seal is a fitting portion between the casing and the valve body portion closer to the other end of the valve body than the one end opening of the internal flow passage of the valve body. The first side seal opens and closes the gap between the fitting portion between the casing and the valve body portion closer to the one end of the valve body than the one end opening of the valve body internal flow passage, and the closing operation of the end face seal is performed. A pressure gauge attachment / detachment characterized in that the opening operation of the first side seal precedes the closing operation of the first side seal precedes the closing release operation of the end face seal. A cylindrical casing having one end fixed to a fluid system and the other end screwed with a pressure gauge mounting portion and having a large inner diameter portion closer to one end and a small inner diameter portion closer to the other end than the large inner diameter portion; Is directed to one end of the casing and the other end is directed to the other end of the casing and fits into the casing, and a cylindrical valve body movable within a predetermined length region of the casing and a valve body housed in the casing An internal flow having a spring that engages with the one end and urges the valve body toward the other end of the casing, one end of which opens at the peripheral side surface near one end of the valve body and the other end of which opens at the other end of the valve body. A passage is formed in the valve body, and the valve body includes a first side surface seal that opens and closes a gap between a portion of the valve body that is closer to one end than the one end opening of the internal flow path and a casing small inner diameter portion, Portion of the valve body closer to the other end than the one end opening of the flow path and the small inner diameter portion of the casing Has a second side surface seal for closing the gap of the fitting portion and an end surface seal for closing the gap of the contact portion between the other end of the valve body and the end portion of the mounting portion of the pressure gauge In the state in which the spring is not biased, the valve body, which receives the biasing force of the spring, moves to the other end side end portion of the casing in the movable region, and the first side surface seal and the second side surface seal face the inner peripheral side surface of the small inner diameter portion of the casing. The gap between the fitting part of the valve body and the small inner diameter part of the casing is closed to shut off the fluid system from the external space, and the mounting part of the pressure gauge is screwed into the other end of the casing to resist the biasing force of the spring. When the valve body is moved toward one end of the casing while the end face seal is compressed by the end face seal, the end portion of the mounting portion of the pressure gauge abuts the other end of the valve body and the gap of the abutting portion is closed by the end face seal. Then, the second side seal faces the inner peripheral side surface of the small inner diameter portion of the casing. To close the gap between the fitting portion of the valve body portion closer to the other end of the valve body than the one end opening of the internal flow passage and the casing small inner diameter portion, the first side surface seal is the inner diameter side surface of the large inner diameter portion of the casing. Facing each other, the gap between the fitting portion between the valve body portion closer to one end of the valve body than the one end opening of the internal flow passage and the small inner diameter portion of the casing is opened, and the opened gap and the internal flow of the valve body are opened. The pressure gauge attachment / detachment joint according to claim 1, wherein the fluid system and the pressure-sensitive portion of the pressure gauge communicate with each other via the passage. The valve body has a first portion having a first side surface seal and a second portion having a second side surface seal and an end surface seal which are separate from the first portion, and the second portion slides around the central axis. The pressure gauge attachment / detachment joint according to claim 2, wherein the first portion is rotatably fitted to the first portion, and the fitting portion forms a part of the valve body internal passage.

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