JP2001317677A - Resin pipe connecting joint for fluid equipment having quartz housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a resin pipe direct to a quartz housing of fluid equipment without using a joint for the connection between the resin pipe and a quartz pipe of the fluid equipment. SOLUTION: A cylindrical quartz joint body 6 is joined to a quartz housing 5 of the fluid equipment. The joining means is selected from fusion, deposition or welding. A resin pipe connecting mechanism 7 employed comprises a cylindrical socket portion 63, a divergently tapering outer sealing surface 64, a cylindrical ring body 71 and a pressure ring 72. The inside back of the socket portion 63 has an annular projection 66 and an annular recess 67. The cylindrical ring body 71 has a chevron-sectioned base portion 73, a projecting portion 74 projected from an end of a resin pipe, an annular recess 79 formed in the tip face of the projecting portion 74 so as to fit on the annular projection 66, an outer annular projection 80, and an inner annular projection 78. The external surface of the outer annular projection 80 has an inner sealing surface 77 pressed against the internal surface of the inside back of the socket portion 63.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe connecting joint for a fluid device having a quartz housing.

[0002]

2. Description of the Related Art Some fluid devices used in various fields such as semiconductors, medical treatment, food, and chemistry, such as liquid tanks and heaters, have a housing made of quartz. On the other hand, a fluororesin-based resin pipe is preferably used for piping in these fields that handles high-purity liquid. As described above, in the case where the housing of the fluid device is made of quartz and a resin tube is used for the piping, the pipe of the resin tube is connected to the housing of the fluid device as shown in FIGS. 8 and 9. Joints were used.

FIG. 8 is a schematic view showing the state of use of a conventional joint, and FIG. 9 is a sectional view of the conventional joint.

In FIG. 8, reference numeral 1 denotes a quartz housing of a fluid device such as a liquid tank or a heater. A pipe made of a resin tube 2 cannot be directly connected to such a quartz housing 1. , Both are housing 1
Are connected via a joint A having a function of connecting the quartz tube 12 and the resin tube 2 connected to each other.

Referring to FIG. 9, the connection structure using the joint A will be described in detail. In this joint A, one end side and the other end side of the tubular joint body 3 are formed in a quartz tube connection port 31 and a resin pipe connection port 32, respectively.

The quartz tube connection port portion 31 has a male screw 33 on the outer peripheral surface thereof, and has a tapered surface 34 with a leading end surface extending forward. The retaining ring 35 fitted in the groove 13 of the quartz tube 12 inserted into the quartz tube connection port 31 and the ferrule 36 fitted outside the quartz tube 12 were screwed into the male screw 33. The pressure is held between the pressing portion 38 of the pressing wheel 37 and the tapered surface 34 that expands. On the side of the quartz tube connection port 31, the sealability is maintained by the ferrule 36, the tapered tapered surface 34, and the press-contact portions of the quartz tube 12.

On the other hand, the resin pipe connection port portion 32 is provided with a male screw 40 formed on the outer peripheral surface thereof and a tapered outer sealing surface 42 having a tapered shape. The tubular ring 43 used in combination with the resin pipe connection port 32 includes:
The base 44 has a chevron-shaped cross section and a protrusion 45 protruding from the end of the resin tube 2 when the base 44 is pressed into the end of the resin tube 2. Then, the tube wall at the end of the resin tube 2 into which the base 44 is press-fitted is deformed into a mountain-shaped cross section, and the end of the resin tube 2 thus deformed is inserted into the resin tube connection port 32 together with the cylindrical ring body 43. The end of the resin pipe 2 is held by the cooperation of the resin pipe connection port 32 and the cylindrical ring body 43. Further, the pressing portion 47 of the pressing ring 46 which is screwed into the male screw 40 and pressed against the wall of the resin tube 2 which is deformed into a mountain-shaped cross section, presses the wall of the resin tube 2 having the mountain-shaped cross section. The outer peripheral surface is pressed against the outer seal surface 42. Further, a stepped inner sealing surface 37 is formed on the inner peripheral portion of the joint body 3, and the distal end surface of the projecting portion 45 of the tubular ring body 43 receives the tightening force of the pressing ring 46, thereby forming an inner sealing surface. 37. On the side of the resin pipe connection port 32, each of an outer seal surface 42, a tube wall of the resin tube 2 deformed into a mountain shape in cross section, a cylindrical ring body 43, an inner seal surface 37, and a protrusion 45 of the cylindrical ring body 43. The sealing performance is maintained by the press contact portion and the like.

In such a joint A, the joint body 3
The components such as the wheel and the pressing wheel 37 are all made of fluorine resin. When connecting a pipe made of the resin pipe 2 to the quartz housing 1 of the fluid device shown in FIG. 8, the work of connecting the quartz pipe 12 to the housing 1 and the resin pipe connection port 32 of the joint A are performed. In addition to the work of connecting the end of the resin tube 2 to the tube, the quartz tube 12 is connected to the quartz tube connection port 31 of the joint A.
Need to do the work of connecting to.

[0009]

However, the joint A in which all of the components are made of a fluororesin is expensive, and it takes a lot of time to accurately perform the above-described operations. Therefore, there is a problem that the operation becomes troublesome, and a problem that the seal reliability tends to be reduced due to the large number of seal locations. Furthermore, since the space for disposing the quartz tube 12 and the joint A must be ensured, there is a possibility that the space may be unreasonable or the freedom of piping may be impaired.

The present invention has been made in view of the above problems and circumstances. Instead of using the conventional joint A and the quartz tube 12 described in FIGS. 8 and 9, a resin tube made of quartz for a fluid device is used. An object of the present invention is to provide a resin pipe connection joint of a fluid device that can be directly connected to a housing.

[0011]

The means employed by the present invention and the operation thereof will be described with reference to the reference numerals shown in FIGS. The reference numerals are provided to facilitate understanding of the content of the invention, and are not intended to limit the content of the invention.

In the present invention, a quartz tubular joint body 6 having a resin pipe connection mechanism 7 is integrally joined to the housing 5 of a fluid device having a quartz housing 5 and provided in the housing 5. The communication passage 51 and the communication passage 62 of the joint body 6 communicate with each other. The joining means between the housing 5 and the joint body 6 can be by means such as fusion, welding or welding. According to such a resin pipe connection joint, since the joint main body 6 is provided with the resin pipe connection mechanism 7, the resin pipe 2 can be connected to the joint main body 6. In addition, since the joint body 6 is made of quartz and is joined to the quartz housing 5, the resin pipe 2 is connected to the housing 5 via the joint body 6 only by connecting the resin pipe 2 to the joint body 6. Is done.

The resin pipe connecting mechanism 7 includes a cylindrical receiving portion 63 provided in the joint body 6, a tapered outer sealing surface 64 formed on the inner periphery of the receiving portion 63, The end of the resin pipe is pressed into the end of the resin pipe to deform the tube wall of the end of the resin pipe into a mountain shape in cross section, and the end of the resin pipe inserted into the socket 63 is cooperated with the socket 63 to clamp the end. The resin pipe 2 is pressed by being screwed into a cylindrical ring body 71 and a screw portion 65 provided on the joint body 6 and tightened, and the outer peripheral surface of the tube wall of the resin pipe 2 having a mountain-shaped cross section is sealed with the outer sealing surface. And a pressing wheel 72 that presses the pressing wheel 64. An annular convex portion 66 is formed concentrically with the receiving portion 63 at an inner portion of the receiving portion 63 of the joint body 6, and an inner peripheral portion of the annular protruding portion 66 and an inner portion of the receiving portion 63 are formed. Annular recess 67 between the circumference
Are formed.

The cylindrical ring body 71 has a base 73 having an angled cross section which is press-fitted into the end of the resin pipe 2, and a projection which protrudes from the resin pipe end when the base 73 is press-fitted into the resin pipe end. And an annular concave portion 79 which fits into the annular convex portion 66 on the distal end surface of the projecting portion 74, and an outer annular convex portion 80 and an inner annular portion which constitute inner and outer walls of the annular concave portion 79. The projection 78 is provided. On the outer peripheral surface of the outer annular convex portion 80, a first inner seal surface 77 that is in pressure contact with the inner peripheral surface 63a at the inner rear portion of the receiving portion 63 is formed.

According to the joint body 6 having the resin pipe connecting mechanism 7 having the above-described structure, the outer annular convex portion 80 of the cylindrical ring body 71 is provided.
A first inner seal surface 77 of the outer periphery of the inner seal portion presses against an inner peripheral surface 63a of the inner deep portion of the receiving portion 63 to perform a sealing function, and an outer sealing surface 64 of the receiving portion 63 is formed of a resin pipe. An outer sealing portion that exerts a sealing function by pressing the base member 2 against a base portion 73 of the cylindrical ring body 71, and a sealing portion that exerts a sealing function by pressing the resin pipe 2 against the cylindrical ring body 71 by the pressing ring 72. Thereby, the sealing performance of the resin pipe 2 with respect to the joint body 6 can be sufficiently exhibited, and liquid leakage can be prevented.

In this case, as shown in FIG. 2, the first inner seal surface 77 is brought into surface contact with the inner peripheral surface 63a at the inner part of the receiving portion 63, or the first inner seal surface 77 is formed. In addition, as illustrated in FIG. 4, one or a plurality of annular projections 70 that linearly contact the inner peripheral surface 63 a of the inner part of the socket 63 can be formed. Also, the second inner seal surface 87 is brought into surface contact with the inner peripheral surface of the annular convex portion 66 as illustrated in FIG. 7, or the second inner seal surface 87 is contacted with the annular convex portion as illustrated in FIG. One or a plurality of annular projections 89 that contact linearly can be formed on the inner peripheral surface of 66.

Further, a first gap 81 is formed between the inner bottom of the annular concave portion 67 of the joint body 6 and the distal end surface of the outer annular convex portion 80 of the cylindrical ring body 71, and the first gap 81 of the annular convex portion 66 of the joint body 6 is formed. A second gap 82 is formed between the distal end surface and the inner bottom of the annular concave portion 79 of the cylindrical ring body 71 by the inner peripheral surface of the annular convex portion 66 of the joint body 6 and the inner annular convex portion 78 of the cylindrical ring body 71. A third gap 83 is formed between the first gap 81 and the outer peripheral surface, and a groove 68 is formed on the outer peripheral surface of the annular convex portion 66 of the joint body 6 so as to communicate the first gap 81 and the second gap 82. , 2, 3 gaps and grooves can be in communication with each other and with the flow passage 62 of the joint body 6. According to this, when the annular concave portion 79 of the tubular ring body 71 and the annular convex portion 66 of the joint body 6 are fitted, an air bleeding function between both members is exhibited.

As shown in FIGS. 5 and 6, on the outer peripheral surface of the inner annular convex portion 78, a second inner seal surface 87 pressed against the inner peripheral surface of the annular convex portion 66 of the joint body 6 is also provided. Is desirable in that the sealing performance can be further improved.

[0019]

FIG. 1 is a schematic view of an embodiment of the present invention, and FIG. 2 is a sectional view showing the internal structure thereof.

1 and 2, reference numeral 5 denotes a quartz housing of a fluid device such as a liquid tank or a heater.
The housing 5 corresponds to the housing 1 described with reference to FIGS. 8 and 9 and has a liquid passage 51.
Reference numeral 6 denotes a quartz-made cylindrical joint body, the base 61 of which is
The housing 5 is integrally joined to the peripheral edge 52 of the flow passage 51. Therefore, the flow passage 5 on the housing 5 side
1 communicates with the flow passage 62 of the joint body 6. As means for joining the housing 5 and the joint body 6, means other than fusion, such as welding or welding, can be adopted.

The joint body 6 has a resin pipe connection mechanism 7. The joint body 6 itself forms a part of the resin pipe connection mechanism 7, and the joint body 6 forms another part of the resin pipe connection mechanism 7. Parts, that is, a tubular ring body 71 and a pressing ring 72 are assembled.

As shown in FIG. 2, the resin pipe connecting mechanism 7 includes a cylindrical receiving portion 63 provided in the joint body 6, a cylindrical ring body 71, and a pressing wheel 72. The receiving portion 63 is a portion corresponding to the resin pipe connection port portion 32 described in FIG. 9, and the pressing ring 72 itself has the same configuration as the pressing ring 46 of the conventional joint A described in FIG. The tubular ring body 71 is partially different from the tubular ring body 43 of the conventional joint A described in FIG.

The joint body 6 includes a base 6 having a flow passage 62.
1 and a cylindrical receiving portion 63 integrally formed at one end of the base portion 61 so as to communicate with the flow passage 62. A male screw 65 is formed on the outer periphery of the distal end of the socket 63, and a large-diameter step 60 is formed at the end of the male screw 65.
A tapered outer sealing surface 64 that widens forward on the inner periphery of the tip
Is formed. In addition, an annular convex portion 66 is formed concentrically with the receiving portion 63 in the inner deep portion of the receiving portion 63 of the joint body 6, and the outer periphery of the annular convex portion 66 and the inner deep portion of the receiving portion 63 are formed. An annular recess 67 is formed between the outer periphery and the periphery. The outer peripheral surface of the annular convex portion 66 of the joint body 6 is formed as a downwardly inclined surface toward the distal end of the annular convex portion 66, and a groove 68 is formed along the inclined surface.

The cylindrical ring body 71 is formed of a fluororesin such as PTFE or PFA or a polypropylene resin which is excellent in heat resistance and chemical resistance or the like, and has a base 73 having a mountain-shaped cross section which is pressed into the end of the resin pipe 2. The base 73 has a protrusion 74 that protrudes from the end of the resin tube 2 by being pressed into the end of the resin tube 2. An annular concave portion 79 that fits into the annular convex portion 66 of the joint body 6 is formed on the distal end surface of the projecting portion 74, and an inner annular convex portion 78 and an outer annular convex portion 80 that form inner and outer walls of the annular concave portion 79. Is provided. The first inner sealing surface 7 that presses against the outer peripheral surface of the outer annular convex portion 80 against the inner peripheral surface 63 a of the inner deep portion of the receiving portion 63 of the joint body 6.
7 are formed.

In this case, the inner sealing surface 77 is formed so as to come into surface contact with the inner peripheral surface 63a at the inner part of the receiving portion 63 as shown in FIG. 2, or the inner sealing surface 77 is formed as shown in FIGS. One or a plurality of annular projections 70 are formed on the sealing surface 77 so as to linearly contact the inner peripheral surface 63 a of the inner portion of the receiving portion 63. When the annular projection 70 is formed so as to linearly contact the inner peripheral surface 63a of the inner deep portion of the receiving portion 63 as in the latter case, the inner peripheral surface 63a of the inner deep portion of the receiving portion 63 is It is possible to increase the surface pressure of the seal portion between the seal portion 77 and the seal surface 77, and to more reliably improve the sealing performance.

The pressing wheel 72 has a female screw 75 screwed into the male screw 65 of the joint body 6 on the inner peripheral surface thereof, and an end of the resin tube 2 into which the cylindrical ring body 71 is press-fitted on the inner periphery at the rear end. A pressing portion 76 is formed to press the tube wall, which is inserted into the portion and is deformed into the mountain shape in cross section of the resin tube 2, against the base portion 73 of the cylindrical ring body 71.

Now, the end of the resin pipe 2 into which the base 73 of the cylindrical ring 71 is press-fitted as described above is inserted into the socket 63 of the joint body 6. Next, the female screw 75 of the press ring 72 inserted into the resin pipe 2 is previously screwed into the male screw 65 of the socket 63, and the screw is tightened most deeply until the distal end surface 72 a of the press ring 72 hits the large-diameter step portion 60 of the joint body 6. Then, the pressing portion 76 of the pressing wheel 72 presses the pipe wall of the resin pipe 2 which is deformed to have a mountain-shaped cross section, and the pressing causes the outer peripheral surface of the pipe wall of the resin pipe 2 having the mountain-shaped cross section to be pressed against the outer seal surface 64. Further, the outer annular convex portion 80 at the tip of the cylindrical ring body 71 is fitted into the annular concave portion 67 inside the joint body 6, and the inner annular convex portion 78 is fitted into the annular convex portion 66 inside the joint body 6. The inner sealing surface 77 of the outer annular convex portion 80 comes into surface contact with the inner peripheral surface 63a of the inner deep portion of the receiving portion 63, or as shown in FIG. The annular projection 70 linearly contacts the inner peripheral surface 63a, and the inner contact surface 77 of the outer annular projection 80 is formed by this surface contact or linear contact.
Is maintained to prevent liquid leakage from between the inner peripheral surface 63a of the inner side of the receiving portion 63.

When the push ring 72 is tightened most deeply until the distal end surface 72a of the push ring 72 contacts the large-diameter step portion 60 of the joint body 6, the inner bottom of the annular concave portion 67 of the joint body 6 and the outer annular ring of the cylindrical ring body 71 are formed. A first gap 81 is formed between the distal end surface of the convex portion 80 and a second gap 82 between the distal end surface of the annular convex portion 66 of the joint body 6 and the inner bottom of the annular concave portion 79 of the tubular ring body 71.
A third gap 83 is formed between the inner peripheral surface of the annular convex portion 66 of the joint body 6 and the outer peripheral surface of the inner annular convex portion 78 of the tubular ring body 71, respectively. Gap 82
Are groove portions 68 on the outer peripheral inclined surface of the annular convex portion 66 of the joint body 6.
Communicated by These first, second and third gaps 81 and 8
2, 83 and the groove 68 are in communication with each other and in communication with the flow passage 62 of the joint body 6. Therefore, when the end of the resin pipe 2 is inserted into the socket 63 of the joint body 6 together with the cylindrical ring 71, the air remaining between the cylindrical ring 71 and the socket 63 is communicated with each other. First gap 81 to third gap
Air can be vented through the gap 83 and the groove 68 to smoothly escape to the flow passage 62 side. Further, the groove 68 provided on the outer peripheral surface of the annular convex portion 66 of the joint body 6 reduces the contact area with the outer peripheral surface of the annular convex portion 66 that comes into contact with the inner peripheral surface of the outer annular convex portion 80 of the cylindrical ring body 71. And the contact resistance can be reduced.

At the connection point of the resin pipe 2, the first inner sealing surface 77 of the projecting portion 74 of the cylindrical ring 71 presses against the inner peripheral surface 63 a of the inner portion of the receiving portion 63, and the receiving portion is pressed. The outer sealing surface 64 of the resin tube 63 connects the resin tube 2 to the base 7 of the cylindrical ring 71.
3, the resin tube 2 is pressed against the cylindrical ring 71 by the pressing wheel 72, so that the sealing property of the resin tube 2 with respect to the joint body 6 can be secured, and liquid leakage can be prevented.

As described above, by connecting the resin pipe 2 to the joint body 6 joined to the housing 5 of the fluid device, the resin pipe 2 is connected to the housing 5 via the joint body 6. Therefore, it is not necessary to use an expensive joint A as in the conventional example described with reference to FIG.
Work to connect the quartz tube 12 to the housing 1
There is no need to perform an operation of connecting the joint 2 to the quartz tube connection port 31 of the joint A.

FIG. 5 is a sectional view showing the internal structure of another embodiment of the present invention. In this embodiment, the points different from those described in FIG. 2 are as follows. That is, in addition to the first inner sealing surface 77, the outer circumferential surface of the inner annular convex portion 78 is further provided on the cylindrical ring body 71 with the annular convex portion 6 of the joint body 6.
6 in that a second inner sealing surface 87 that is in pressure contact with the inner peripheral surface is formed, and gaps 82 and 83 and a groove 68 as shown in FIG. 2 are not provided.

In the embodiment described with reference to FIG. 5, the sealing performance is maintained by the second inner sealing surface 87, and the sealing performance of the resin tube 2 can be further improved. Also in this case, similarly to the case of the first inner seal surface 77, the second inner seal surface 87 is brought into surface contact with the inner peripheral surface 63a of the inner deep portion of the receiving portion 63 as shown in FIG. Alternatively, as shown in FIGS. 6 and 7, one or a plurality of annular projections 89 are formed on the inner seal surface 87 so as to linearly contact the inner peripheral surface of the annular projection 66. Other configurations and operations are shown in FIG.
Since this is the same as that described with reference to FIG. 3, the same or corresponding portions are denoted by the same reference characters and description thereof is omitted.

[0033]

According to the present invention, a resin tube is connected directly to a quartz housing of a fluid device without securing the sealability, without using the conventional joint or quartz tube described with reference to FIGS. It becomes possible to do. Therefore, there is no need to perform cumbersome connection work such as work for connecting a quartz tube to a housing and work for connecting a quartz tube to a quartz tube connection port of a joint, which is conventionally required. The connection workability and sealing performance of the resin pipe can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a use state of an embodiment of the present invention.

FIG. 2 is a sectional view showing the internal structure of one embodiment of the present invention.

FIG. 3 is a sectional view showing the internal structure of another embodiment of the present invention.

FIG. 4 is an enlarged view of an inner seal portion in FIG.

FIG. 5 is a sectional view showing an internal structure of still another embodiment of the present invention.

FIG. 6 is a sectional view showing the internal structure of still another embodiment of the present invention.

FIG. 7 is an enlarged view of an inner seal portion in FIG.

FIG. 8 is a schematic view showing a use state of a conventional joint.

FIG. 9 is a sectional view of a conventional joint.

[Explanation of symbols]

2 Resin tube 77 First inner sealing surface 5 Housing 78 Inner annular convex portion 6 Joint body 79 Annular concave portion of cylindrical ring body 7 Resin tube connection mechanism 80 Outer annular convex portion 51 Flow passage 81 First gap 62 Flow passage 82 First 2 gap 63 receiving portion 83 third gap 64 outer sealing surface 87 second inner sealing surface 65 male screw (screw portion) 89 annular projection 66 annular projection 67 annular recess 68 groove 70 annular projection 71 cylindrical ring body 72 pressing ring 73 Base of cylindrical ring 74 Projection of cylindrical ring

Claims (8)

[Claims] 1. A quartz tubular joint body having a resin pipe connection mechanism is integrally joined to the housing of a fluid device having a quartz housing, and a flow passage provided in the housing and the fluid passage. The flow passage of the joint body is in communication with the resin pipe connecting mechanism. The resin pipe connecting mechanism includes a tubular receiving portion provided in the fitting body, and a tapered outer portion formed on an inner periphery of the receiving portion. The sealing surface and the end of the resin pipe inserted into the socket while the pipe wall of the end of the resin pipe is pressed into the end of the resin pipe to deform the wall of the end of the resin pipe into a mountain shape in cooperation with the socket. A pressing ring that presses the resin pipe by being screwed into a threaded portion provided in the joint body and tightened by being screwed into a screw portion provided in the joint body, and pressing the outer peripheral surface of the pipe wall having a mountain-shaped cross section of the resin pipe against the outer sealing surface. And a receiving part of the joint body. An annular convex portion is formed concentrically with the receiving portion in the inner rear portion, and an annular concave portion is formed between the outer periphery of the annular convex portion and the inner periphery of the inner rear portion of the receiving portion, The cylindrical ring body has a base having a chevron cross section that is press-fitted into the end of the resin pipe, and a protruding portion that protrudes from the end of the resin pipe when the base is pressed into the end of the resin pipe. An annular concave portion that fits into the annular convex portion is formed on the distal end surface of the portion, and an outer annular convex portion and an inner annular convex portion that form inner and outer walls of the annular concave portion are provided. A resin pipe connection joint for a fluid device having a quartz housing having a first inner sealing surface formed on a surface thereof, the first inner sealing surface being in pressure contact with the inner peripheral surface of the inner part of the receiving portion. 2. The resin pipe connecting joint for a fluid device having a quartz housing according to claim 1, wherein the first inner sealing surface is in surface contact with an inner peripheral surface of an inner deep portion of the receiving portion. 3. The method according to claim 1, wherein one or a plurality of annular projections are formed on the first inner sealing surface so as to linearly contact an inner peripheral surface of an inner part of the socket. Resin pipe connection joint for fluid equipment having a quartz housing. 4. A first gap between the inner bottom of the annular concave portion of the joint body and the distal end surface of the outer annular convex portion of the tubular ring body, and a first gap between the distal end surface of the annular convex portion of the joint body and the tubular ring body. And a third gap between the inner peripheral surface of the annular convex portion of the joint body and the inner peripheral surface of the inner convex portion of the cylindrical ring body, respectively. A groove is formed on the outer peripheral surface of the annular convex portion of the joint body to communicate the first gap and the second gap, and the first, second, and third gaps and the groove communicate with each other to communicate with the flow passage of the joint body. A resin pipe connection joint for a fluid device having the quartz housing according to any one of claims 1 to 3. 5. A joint according to claim 1, wherein a second inner sealing surface is formed on an outer peripheral surface of said inner annular convex portion to press against an inner peripheral surface of said annular convex portion of said joint body. Resin pipe joint for fluid equipment having a quartz housing. 6. The resin pipe joint of a fluid device having a quartz housing according to claim 5, wherein the second inner sealing surface is in surface contact with the inner peripheral surface of the annular convex portion of the joint body. 7. The one or more annular projections according to claim 5, wherein the second inner sealing surface is formed with one or more annular projections that linearly contact the inner peripheral surface of the annular projection of the joint body. Resin pipe connection joint for fluid equipment having a quartz housing. 8. A joint means for connecting the housing and the joint body,
8. A method according to claim 1, wherein said means is fusion, welding or welding.
A resin pipe connection joint for a fluid device having the quartz housing according to any one of the above.