JP6649004B2 - Pipe fitting, fluid control device, and fluid control device - Google Patents

Description

  The present invention relates to a pipe joint, a fluid control device, and a fluid control device.

  As a conventional pipe coupling, a fluid coupling described in Patent Document 1 is disclosed. The fluid coupling includes first and second pipe members, which are coupling members having fluid passages communicating with each other, and coupling means for coupling the first and second pipe members. First and second flange portions are formed at one ends of the first and second pipe members, respectively. And a clip formed by the upper wall and the pair of side walls, the first and second flange portions being sandwiched by the pair of side walls from both sides in the pipe length direction (axial direction) of the first and second pipe members; A retaining spring that abuts against an outer peripheral surface of the second pipe member and presses the second pipe member in a pipe radial direction (a direction orthogonal to the axial direction) of the first and second pipe members by an elastic force; . Further, a seal member is interposed between the outer peripheral surface of the first flange portion and the inner peripheral surface of the second flange portion.

JP 2013-96507 A

By the way, in recent years, along with downsizing of various devices, miniaturization of each component device of the device has been promoted, and further miniaturization of conventional small pipe fittings and valves (fluid control devices) used in the device has been promoted. Is required.
However, when the device is small, the construction space in the device is inevitably narrow, and it is extremely difficult to join the pipe joints using a tool such as a wrench that is used for rotation.

Further, in order to improve the sealing property of the pipe joint, it is preferable to use a sealing member (O-ring or gasket) made of an elastic body such as resin. However, when assembling the pipe joint, it is extremely difficult to attach a very small seal member to the pipe joint, and there is also a problem that the seal member is easily lost during the work due to the extremely small size.
In addition, it is assumed that the pipe joint is disassembled due to maintenance of the apparatus and is repeatedly attached to and detached from the apparatus. In this case, the possibility of loss of the seal member is further increased.

In the case where a resin-made sealing member is used, if the pipe joint is repeatedly disassembled and detached, a scratch is generated at a contact point between the first and second flange portions made of metal, thereby deteriorating the sealing property of the pipe joint. There is a risk.
Further, when the first and second pipe members are sandwiched by applying an elastic force to the clip, it is assumed that the elastic force of the clip varies at each pipe joint. When it is assumed that the elastic force of the spring member involved in clamping the first and second pipe members varies, in order to ensure the sealability of the pipe joint, the spring member has a large value multiplied by the safety factor. It is necessary to set the elastic force in advance.

However, if the elastic force of the spring member is too large, the workability of attaching the spring member may be deteriorated.
The present invention has been made in view of such a problem, and aims at being excellent in both workability and sealability, suitable for use in small devices, and having high productivity and reliability. It is to provide a pipe joint, a fluid control device, and a fluid control device.

In order to achieve the above object, a pipe joint of the present invention, a fluid control device, and a pipe joint used for a fluid control device have a first pipe member having a first flange portion at one end and a second flange portion at one end. A housing having a second pipe member, an inner flange portion having an inner diameter reduced at one end and a first end surface opening formed by the inner flange portion, and a second end surface opening at the other end; A leaf spring that is housed and presses the second flange portion toward the first flange portion, wherein the housing has the first flange portion locked to the inner flange portion and the first and second pipe members have a lengthwise direction. In a state where the second flange portion is in contact with the first flange portion, the first side opening in which the leaf spring is accommodated in the housing, the accommodation space for the leaf spring, and the accommodation space at a position facing the first side opening. and a second side opening communicating, leaf spring housing space leaf springs A positioning portion for positioning at the inner, facing the positioning portion includes a pressing portion for pressing the second flange portion, continuous with the positioning portion and the pressing portion, and a bent portion for applying a pressing force to the pressing portion, By inserting the first pipe member from the other end into the first end face opening through the second end face opening, the first flange portion is locked to the inner flange portion, and the second pipe is inserted into the second end face opening from the second flange portion. The second flange portion is directed toward the first flange portion by inserting the member , pushing the leaf spring into the accommodation space from the first side opening, and accommodating the pressing portion in the accommodation space while bending the pressing portion in a direction to approach the positioning portion. And the second flange portion and the first flange portion form a seal portion in the housing, and the seal portion is formed by an annular elastic member protruding from one of the first and second flange portions. 2 Make sure that the other side of the flange .

  According to the pipe joint, the fluid control device, and the fluid control device of the present invention, the pipe joint is excellent in both workability and sealability, is suitable for use in a small-sized manufacturing device, and has high productivity and reliability. A fluid control device and a fluid control device can be provided.

It is a perspective view of a pipe joint concerning one embodiment of the present invention. FIG. 2 is a partial vertical sectional view of the pipe joint of FIG. 1. FIG. 3 is a perspective view of a first pipe member of FIG. 2. FIG. 3 is a perspective view of a second pipe member of FIG. 2. FIG. 5 is a longitudinal sectional view of a second flange portion of FIG. 4. FIG. 3 is a perspective view of the housing of FIG. 2. It is sectional drawing which looked at the housing | casing of FIG. 6 from AA direction. It is sectional drawing which looked at the housing | casing of FIG. 6 from the BB direction. FIG. 3 is a perspective view of the leaf spring of FIG. 2. It is the figure which looked at the leaf spring of FIG. 9 from C direction. FIG. 3 is a perspective view of the washer of FIG. 2. FIG. 3 is a perspective view of the bush of FIG. 2. FIG. 2 is an exploded perspective view showing each member in a cross section by disassembling the pipe joint of FIG. 1. FIG. 14 is a diagram illustrating a state where the first pipe member is inserted into the housing from the state illustrated in FIG. 13. It is the figure which showed the state which mounted the washer to the 2nd pipe member from the state of FIG. It is the figure which showed the state which mounted the bush to the 2nd pipe member from the state of FIG. FIG. 17 is a diagram illustrating a state where the second pipe member is inserted into the housing from the state of FIG. 16. FIG. 18 is a view showing a state where the leaf spring is mounted on the housing from the state of FIG. 17 and assembly of the pipe joint is completed. It is a longitudinal cross-sectional view of the pipe joint of FIG. FIG. 20 is an enlarged view of the seal portion of FIG. 19. FIG. 19 is a partial longitudinal sectional view of the pipe joint of FIG. 18. FIG. 22 is an enlarged view of a pressing portion of FIG. 21.

Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the pipe joint 1 is a casing for accommodating and coupling the first and second pipe members 4 and 6 forming the fluid passage 2 with the first and second pipe members 4 and 6. And a body 8. The first pipe member 4 and the housing 8 are made of metal, and the second pipe member 6 is also made of metal except for an elastic member 19 described later in detail. The outer end (the other end) 4a, 6a of the first and second pipe members 4, 6 is connected to a pipe (not shown) or an inlet or outlet of an automatic or manual valve by welding or the like. Thus, a fluid control device is formed.

  This fluid control device is used for a fluid control device in which a flow controller, a regulator, and the like, not shown, are connected by piping. The fluid control device is used, for example, in a fluid processing line of a small device (not shown). This small device is composed of small devices including the pipe joint 1 and the valve.

As shown in FIG. 2, the pipe joint 1 further includes a leaf spring 10 and a washer 12 housed in the housing 8, and a bush 14 attached to the housing 8. The leaf spring 10, the washer 12, and the bush 14 are all made of metal.
As shown in FIG. 3, the first pipe member 4 has a first flange portion 16 formed at an inner end (one end) 4 b of the pipe joint 1. The first flange portion 16 has a flat surface 16a along the pipe diameter direction Y of the first pipe member 4 at the inner end 4b, and the fluid passage 2 is opened in the flat surface 16a.

As shown in FIG. 4, the second pipe member 6 has a second flange portion 18 having substantially the same diameter as the first flange portion 16 at an inner end (one end) 6 b of the pipe joint 1.
As shown in FIG. 5, the fluid passage 2 is opened in the second flange portion 18, and an annular groove 18 a is formed so as to surround the opening of the fluid passage 2. An annular elastic member 19 is fitted into the annular groove 18a, thereby forming the second flange portion 18 to which the elastic member 19 is attached, and thus the second pipe member 6.

  The elastic member 19 is formed of a relatively high-hardness resin such as PTFE (polytetrafluoroethylene, Polytetrafluoroethylene). The elastic member 19 includes an annular fitting portion 19a fitted into the annular groove 18a, and an annular projecting portion 19b projecting from the fitting portion 19a in a triangular cross-section. The projection 19b has an outer tapered surface 19b1 forming the outer circumference of the projection 19b, an inner tapered surface 19b2 forming the inner circumference of the projection 19b, and a pipe diameter direction Y formed between the outer and inner tapered surfaces 19b1, 19b2. Is formed from the flat surface 19b3.

  On the other hand, an inner peripheral wall 18b is formed on the second flange portion 18 between the annular groove 18a and the fluid passage 2, and an outer peripheral wall 18c is formed on the outer peripheral side of the annular groove 18a. Then, as shown in FIG. 5, the inner and outer peripheral walls 18b, 18c are caulked and bent in a direction along the inner and outer tapered surfaces 19b2, 19b1, respectively, with pliers or dedicated jigs. Thus, the inner and outer peripheral corners of the fitting portion 19a are slightly crushed, and the inner and outer peripheral walls 18b and 18c function as locking claws of the elastic member 19 in the annular groove 18a. Is prevented from falling off.

As shown in FIGS. 6 to 8, the housing 8 has a small rectangular parallelepiped outer shape (for example, the length in the pipe diameter direction Y as viewed in FIG. 6: about 12 mm, the length in the pipe length direction X: about 15 mm). , The length in the width direction Z: about 10 mm), and the inside of the housing 8 is a cylindrical cavity.
An outer end 4a of the first tube member 4 protrudes from one end 8a of the housing 8, and an inner flange portion 20 formed by reducing the inner circumference of the housing 8 is formed. A first end face opening 22 is formed at one end 8 a by the inner flange portion 20. The first end face opening 22 has a smaller diameter than the first and second flange portions 16 and 18. On the other hand, a second end surface opening 24 from which the outer end 6a of the second pipe member 6 projects is formed at the other end 8b of the housing 8.

The second end face opening 24 has a circular shape slightly larger in diameter than the diameters of the first and second flange portions 16, 18, and the first and second flange portions 16, 18 can be inserted therethrough.
Further, on the side surface 8c of the housing 8, the first flange portion 16 is locked to the inner flange portion 20 and the elastic member 19 of the second flange portion 18 in the pipe length direction X of the first and second pipe members 4, 6. A first side opening 26 in which the leaf spring 10 is accommodated in the housing 8 is formed in a state in which the flat spring 16 is in contact with the flat surface 16 a of the first flange portion 16.

  The housing space 28 of the plate spring 10 in the housing 8 is a space surrounded by a first inner end surface 28a, a second inner end surface 28b, and a pair of inner side surfaces 28c and 28d. The first inner end face 28a extends from the first side opening 26 in the pipe radial direction Y (a direction orthogonal to the pipe length direction) Y inside the housing 8, and the second end face opening 24 is opened. The second inner end face 28b extends from the first side opening 26 in the pipe diameter direction Y inside the housing 8, and faces the first inner end face 28a. The pair of inner side surfaces 28c and 28d are formed continuously from the first and second inner end surfaces 28a and 28b. Further, as shown in FIG. 7, a second side opening 30 communicating with the accommodation space 28 is formed in the housing 8 at a position facing the first side opening 26.

  As shown in FIG. 8, step portions 28 e are formed on the pair of inner side surfaces 28 c and 28 d on the first inner end surface 28 a side and the second inner end surface 28 b side in the pipe length direction X, respectively. Due to the steps 28e, the width of the first inner end surface 28a in the width direction Z is smaller than that of the second inner end surface 28b. In addition, on the inner flange portion 20 side of the housing space 28 of the leaf spring 10 in the housing 8, cylindrical first and second flange portions having inner diameters slightly larger than the first and second flange portions 16 and 18 are provided. 16 and 18 accommodation spaces 32 are secured. On the second end face opening 24 side of the accommodation space 28, an accommodation space 34 for the cylindrical bush 14 having substantially the same inner diameter as the accommodation space 32 is secured.

  As shown in FIG. 9, the leaf spring 10 includes a positioning portion 10a, a pressing portion 10b, and a bent portion 10c. The leaf spring 10 is housed in the housing space 28 and presses the second flange portion 18 toward the first flange portion 16 to form a seal portion 36 described below between the first and second pipe members 4 and 6. . Specifically, the positioning portion 10a is in contact with the first inner end surface 28a, and positions the leaf spring 10 in the housing space 28. The pressing portion 10b presses the second flange portion 18 on the second inner end surface 28b side. The bent portion 10c is continuous with the positioning portion 10a and the pressing portion 10b, and the leaf spring 10 applies a predetermined pressing force to the pressing portion 10b by bending of the bent portion 10c.

The positioning portion 10a and the pressing portion 10b have notches 10a2 formed by cutting the opposed tips 10a1 and 10b1 in a U-shape in a range that is larger than the pipe diameter of the second pipe member 6 in the pipe diameter direction Y. 10b2 are formed.
The pressing portion 10b is bent from the front end 10b1 to the bent portion 10c so as to protrude to the opposite side to the opposing positioning portion 10a, and a bending line 10b3 extending in the width direction of the pressing portion 10b is formed.

In the present embodiment, the positioning portion 10a and the pressing portion 10b of the leaf spring 10 are formed to have substantially the same length in the pipe diameter direction Y.
As shown in FIG. 10, when the leaf spring 10 is housed in the housing space 28, the positioning portion 10 a and the pressing portion 10 b have a shape in which the width in the width direction Z complements each step portion 28 e. That is, the width of the positioning portion 10a in contact with the first inner end surface 28a is smaller in the width direction Z than the pressing portion 10b located on the second inner end surface 28b side.

As shown in FIG. 11, the washer 12 is provided between the leaf spring 10 and the second flange portion 18 and is externally fitted to the second pipe member 6, and has, for example, an annular flat plate shape. The washer 12 has an outer diameter (for example, about 7 mm) slightly smaller than the inner diameter of each of the storage spaces 32 and 34. Further, the washer 12 is subjected to a hardening process such as quenching, so that when the leaf spring 10 is mounted, it is possible to prevent the leaf spring 10 from damaging the second pipe member 6.
As shown in FIG. 12, the bush 14 has one end 14 a engaged with the second end face opening 24 and fitted on the second pipe member 6. Further, the bush 14 has an outer diameter (for example, about 7 mm) slightly smaller than the inner diameter of each of the storage spaces 32 and 34.

Hereinafter, the procedure for assembling the pipe joint 1 will be described in detail with reference to FIGS.
First, as shown in FIG. 13, the components of the pipe joint 1 are arranged side by side. Next, the first pipe member 4 is inserted into the housing 8 as shown in FIG. At this time, in the housing 8, the first flange member 16 is locked to the inner flange portion 20 by inserting the first pipe member 4 from the outer end 4 a to the first end surface opening 22 through the second end surface opening 24. You.

Next, as shown in FIG. 15, the washer 12 is externally fitted to the second pipe member 6 and brought into contact with the second flange portion 18. Next, as shown in FIG. 16, the bush 14 is fitted onto the second pipe member 6.
Next, as shown in FIG. 17, the second pipe member 6 is inserted through the second flange portion 18 into the second end face opening 24, and the second flange portion 18 abuts against the first flange portion 16 in the housing 8. Can be At this time, the washer 12 is positioned on the second inner end surface 28b side of the accommodation space 28, and one end 14a of the bush 14 is engaged with and attached to the second end surface opening 24.

Finally, as shown in FIG. 18, the leaf spring 10 is pushed into the accommodation space 28 by pushing the leaf spring 10 with a plier or a dedicated jig, so that the pressing portion 10b is bent in a direction to approach the positioning portion 10a. To the housing 8 to complete the assembly of the pipe joint 1.
As shown in FIG. 19, in the pipe joint 1 assembled and completed in the above-described procedure, the U-shaped bottoms of the notches 10a2 and 10b2 of the positioning part 10a and the pressing part 10b approach or come close to the second pipe member 6. In the contact state, the tip 10a1 of the positioning portion 10a and the tip 10b1 of the pressing portion 10b protrude from the second side opening 30.

In addition, since the washer 12 is positioned on the second inner end surface 28b side of the accommodation space 28, the pressing portion 10b of the leaf spring 10 surely presses not the first inner end surface 28a but the washer 12, and thus the second flange portion 18, A seal portion 36 is formed between the first and second pipe members 4 and 6.
Then, as shown in FIG. 20, when the pressing portion 10b of the leaf spring 10 presses the second flange portion 18, the flat surface 19b3 of the elastic member 19 comes into surface contact with the flat surface 16a of the first flange portion 16, When the elastic member 19 is slightly crushed in the pipe length direction X, the seal portion 36 between the first and second pipe members 4 and 6 is formed as an annular sealing surface 38.

  Further, as shown in FIGS. 21 and 22, by forming the bending line 10 b 3 in the pressing portion 10 b of the leaf spring 10, the washer 12 is pressed by the plate spring 10 by two linear pressing lines 40. . Thus, the surface pressure of the seal portion 36 at the seal surface 38 is determined based on the pressing force of the leaf spring 10 and the elastic force of the elastic member 19. Further, the elastic member 19 is crushed in the range of elastic deformation by the pressing of the leaf spring 10, that is, a crushing allowance in the pipe length direction X is previously secured so that the elastic member 19 is crushed in a range where the elastic member 19 exceeds the elastic limit and does not undergo plastic deformation. Have been. Further, the crushing allowance of the elastic member 19 is set to a width in the pipe length direction X in which variation in the pressing force due to the individual difference of the leaf spring 10 is allowable.

As described above, according to the present embodiment, the pipe joint 1 is excellent in both workability and sealability, is suitable for use in a small-sized manufacturing apparatus, and has high productivity and high reliability. Fluid control device, and a fluid control device using the fluid control device.
Specifically, by forming the first side opening 26 in the side surface 8 c of the housing 8, the first flange portion 16 is locked by the inner flange portion 20 and the first and second pipe members 4, 6 are closed. The leaf spring 10 is housed in the housing 8 in a state where the second flange portion 18 is in contact with the first flange portion 16 in the pipe length direction. Accordingly, when the construction space in the small device is narrow, the first and second joints in the pipe joint 1 can be performed simply by accommodating and mounting the leaf spring 10 in the housing 8 without using a rotating tool such as a spanner. The seal portion 36 between the two pipe members 4 and 6 can be formed, and the workability related to the connection of the pipe joint 1 can be greatly improved.

  In addition, since the sealing portion 36 can be formed by the sealing surface 38 in which the elastic member 19 projecting from the second flange portion 18 is brought into surface contact with the first flange portion 16, for example, the first and second metal members are formed. The sealability of the seal portion 36 can be improved as compared with a case where the flange portions 16 and 18 are in line contact with each other and the seal portion 36 is formed by an annular seal line. Further, at the time of assembling the pipe joint 1 or at the time of maintenance, it is possible to eliminate a concern that a very small seal member such as an O-ring or a gasket which is a separate member is lost.

  Further, since the sealing surface 38 is formed by the elastic member 19, even if the pipe joint 1 is disassembled for maintenance of the device and is repeatedly attached to and detached from the device, the contact portion between the first and second flange portions 16 and 18 is formed. No damage is caused to the pipe joint 1, and the sealing performance of the pipe joint 1 can be maintained high.

In addition, since the elastic member 19 is provided with a crushing allowance in which the elastic member 19 is crushed within a range of elastic deformation by the pressing of the leaf spring 10, plastic deformation of the elastic member 19 is prevented, and the elastic member 19 can be connected to the pipe joint 1 by so-called hetari. A reduction in sealing performance can be suppressed.
Further, the crushing allowance of the elastic member 19 is set to a width in which the variation of the pressing force due to the individual difference of the leaf spring 10 is allowed, so that the pressing force of the leaf spring 10 The plastic deformation of the elastic member 19 due to the pressing is avoided, and the sealing property of the pipe joint 1 can be constantly maintained by the combined force of the pressing force of the leaf spring 10 and the elastic force of the elastic member 19.

  Further, even when the pressing force by the leaf spring 10 is not so large, the sealing force of the seal portion 36 can be increased by the combined force of the pressing force of the leaf spring 10 and the elastic force of the elastic member 19, and the pipe joint 1 Can be effectively improved in sealing performance. Therefore, it is not necessary to set the elastic force of the leaf spring 10 to a large value multiplied by the safety factor in order to secure the sealing performance of the pipe joint 1, so that the work of attaching the leaf spring 10 to the housing 8 is easily performed. be able to.

Further, when the pipe joint 1 is repeatedly attached and detached, even if the leaf spring 10 is severed and a desired pressing force cannot be obtained from the leaf spring 10, the pipe spring is supplemented by the elastic force of the elastic member 19. The required tightening load of the joint 1 can be maintained.
Further, since the bending line 10 b 3 is formed in the pressing portion 10 b of the leaf spring 10, the washer 12 is pressed by the plate spring 10 by two linear pressing lines 40. As a result, the central portion of the washer 12 can be reliably pressed by the leaf spring 10, so that the pressing force of the leaf spring 10 more effectively enhances the sealing force in the seal portion 36 and, consequently, the sealing performance in the pipe joint 1. it can.

  Further, a second side opening 30 communicating with the accommodation space 28 is formed in the housing 8 at a position facing the first side opening 26, and the U-shaped cutouts 10a2 and 10b2 of the positioning portion 10a and the pressing portion 10b are formed. The tip 10a1 of the positioning portion 10a and the tip 10b1 of the pressing portion 10b protrude from the second side opening 30 with the bottom of the shape approaching or abutting the second pipe member 6. Thus, the leaf spring 10 can be easily removed from the housing 8 by pressing the tip 10a1 of the positioning portion 10a and / or the tip 10b1 of the pressing portion 10b protruding from the second side opening 30. Therefore, replacement of the leaf spring 10 and disassembly of the pipe joint 1 can be easily performed, and the maintenance property of the pipe joint 1 can be improved.

  In addition, steps 28e are formed on the inner surfaces 28c and 28d of the housing space 28 of the leaf spring 10 in the housing 8, and when the leaf spring 10 is housed in the housing space 28, the width of the positioning portion 10a and the width of the pressing portion 10b are increased. The width in the direction Z has a shape that complements each step 28e. Thus, it is possible to prevent the leaf spring 10 from being erroneously assembled to the housing space 28 of the housing 8 such that the pressing portion 10b is brought into contact with the first inner end surface 28a and mounted. Therefore, it is possible to reliably press the washer 12 by the leaf spring 10 by line contact, and it is possible to prevent a decrease in the sealing performance of the pipe joint 1 due to the erroneous assembly.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to this, and various changes can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the flat surface 16 a is formed on the first flange portion 16, and the flat surface 19 b 3 of the elastic member 19 is formed on the second flange portion 18. However, the present invention is not limited thereto, and the seal surface 38 may be formed. For example, the elastic member 19 may be provided on the first flange 16 and the flat surface may be formed on the second flange 18.

Further, as long as the sealing surface 38 can be formed, the shape, material, and mounting method of the elastic member 19 are not limited to the above embodiment.
In the above embodiment, both the tip 10a1 of the positioning portion 10a of the leaf spring 10 and the tip 10b1 of the pressing portion 10b protrude from the second side opening 30. However, the present invention is not limited to this, and at least one of the tips 10a1 and 10b1 may project from the second side opening 30.

Further, in order to prevent the leaf spring 10 from coming off from the first and second side openings 26 and 30 of the housing 8, a retaining clip (not shown) may be provided.
Further, the housing 8 and the leaf spring 10 are not limited to the shapes of the above embodiment, and can be applied to the pipe joint 1 without the washer 12 or the bush 14.
Further, a fluid control device in which the pipe joint 1 is connected to a valve is applicable to a fluid control device constituting various fluid circuits, and a fluid control device using the fluid control device is applicable to various small manufacturing devices. It is.

DESCRIPTION OF SYMBOLS 1 Pipe joint 4 1st pipe member 4a Outer end (other end)
4b Inner end (one end)
6 Second pipe member 6a Outer end (other end)
Reference Signs List 8 housing 8a one end 10 leaf spring 16 first flange portion 18 second flange portion 19 elastic member 20 inner flange portion 22 first end face opening 24 second end face opening 26 first side face opening 36 seal part

Claims (5)

A first pipe member having a first flange portion at one end;
A second pipe member having a second flange portion at one end;
A housing having an inner flange portion having an inner periphery reduced in diameter at one end and a first end surface opening formed of the inner flange portion, and having a second end surface opening at the other end;
A leaf spring housed in the housing and pressing the second flange portion toward the first flange portion,
The housing is
In a state where the first flange portion is locked to the inner flange portion and the second flange portion is in contact with the first flange portion in the pipe length direction of the first and second pipe members, the leaf spring is connected to the housing. A first side opening housed in the body ,
An accommodation space for the leaf spring,
A second side opening communicating with the housing space at a position facing the first side opening ;
The leaf spring,
A positioning unit for positioning the leaf spring in the housing space;
A pressing portion that faces the positioning portion and presses the second flange portion;
A bending portion which is continuous with the positioning portion and the pressing portion and applies a pressing force to the pressing portion;
Including
By inserting the first pipe member from the other end into the first end opening through the second end opening, the first flange portion is locked to the inner flange portion, and the second flange is inserted into the second end surface opening. Inserting the second pipe member from the flange portion , pushing the leaf spring from the first side opening into the accommodation space, and accommodating the pressing portion in the accommodation space while bending the pressing portion in a direction to approach the positioning portion. Thereby, the second flange portion is pressed toward the first flange portion, and the second flange portion and the first flange portion form a seal portion in the housing,
The pipe joint, wherein the seal portion includes an annular elastic member protruding from one of the first and second flange portions in surface contact with the other of the first and second flange portions.   2. The pipe joint according to claim 1, wherein the elastic member has a squeezing allowance in a range of elastic deformation by pressing of the leaf spring. 3.   The pipe joint according to claim 2, wherein the crushing allowance is set to a width that allows variation in the pressing force due to individual differences of the leaf springs. It is a fluid control apparatus provided with the pipe joint according to any one of claims 1 to 3,
A fluid control device, comprising: a valve having a fluid inlet and an outlet, and a valve having at least one of the inlet and the outlet connected to the other end of at least one of the first and second pipe members.   A fluid control device comprising the fluid control device according to claim 4.

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