JP4721010B2 - Gasket retainer used in fluid coupling and fluid coupling - Google Patents

Description

  The present invention relates to a fluid coupling, and more particularly, to a fluid coupling useful for connecting a mass flow controller, an on-off valve, a coupling block interposed therebetween, and the like in a fluid control apparatus for semiconductor manufacturing, and a fluid coupling. The present invention relates to a retainer for holding a gasket.

  A fluid control device for semiconductor manufacturing is configured by combining a mass flow controller for adjusting a flow rate, a pressure regulator for adjusting a pressure, and an on-off valve, and the like. As a preferable configuration, a configuration is proposed in which the mass flow controller and the on-off valve are connected via an appropriate connection block (see Patent Document 1). FIG. 6 shows the configuration of the fluid coupling disclosed therein.

  In FIG. 6, the fluid coupling includes male and female joint members (91) and (92) each provided with annular protrusions (98) and (99) for holding a gasket on the butt end face, and both joint members (91) ( (92) an annular gasket (93) interposed between the butted end faces, and a retainer (94) that holds the outer peripheral surface of the gasket (93) and holds the gasket (93) on the female joint member (92). It has. Here, each joint member (91) (92) is a connecting block, a mass flow controller main body, or a block connected to an on-off valve. One of the butted end faces of these joint members (91) and (92) is male and the other is female, and a fitting recess (96) provided on the butted end face of the female joint member (92). ), The fitting protrusions (95) protruding in the axial direction are fitted to the abutting end faces of the male fitting member (91), thereby fitting the fitting members (91) (92) in the radial direction. Misalignment is prevented. Then, a retainer holding cylindrical portion (97) is formed on the abutting end surface of the female joint member (92), and the retainer (94) holds the retainer holding cylindrical portion (97), thereby providing a gasket ( 93) is held by the female joint member (92).

In addition, as a device for preventing the displacement between the joint members, the outer peripheral surface of the end of one joint member is connected to the inner peripheral surface of one half of the retainer holding the gasket, and the inner peripheral surface of the other half of the retainer. One that holds the outer peripheral surface of the end of the other joint member has been proposed (for example, Patent Document 2).
JP-A-8-326943 Japanese Patent Publication No. 6-89865

  In the conventional fluid coupling, since there are two types of joint members, male and female, it is necessary to distinguish the connection direction when connecting the members, and thus it takes time and effort to connect, When the connection direction is reversed, there is a problem that a separate joint member in which the male and female are reversed may be required.

  By eliminating the distinction between male and female molds, the effect of preventing radial displacement due to fitting is lost, and in the joint member (91) that is not held by the retainer (94), its annular protrusion ( 98) tends to be displaced in the radial direction with respect to the gasket (93). As a result, the gasket pressing annular protrusion (98) is detached from the end face of the gasket (93), resulting in a problem that the sealing performance is deteriorated.

  Moreover, in the thing of patent document 2, when the other joint member has shifted | deviated with respect to one joint member, when a joint member is faced | matched, a retainer and a joint member interfere, or it is in the function of a retainer. There is a possibility of exerting an adverse force, and it is difficult to achieve both the holding of the joint member and the guide function.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid coupling and a gasket holding retainer used in the fluid coupling that eliminate the distinction between male and female joint members and prevent deterioration in sealing performance due to displacement.

A fluid coupling according to the present invention includes first and second coupling members having fluid passages communicating with each other, an annular gasket interposed between the butted end surfaces of both coupling members, and a retainer that holds the gasket. In the fluid coupling provided, a retainer storage recess is provided on the end face of each joint member, and an annular protrusion for holding a gasket with an annular protrusion is provided on the bottom surface of each retainer storage recess. A retainer body that is attached to the outer periphery of the annular protrusion of one of the joint members while holding the outer peripheral surface of the joint member, and a guide ring portion that guides the outer peripheral surface of the retainer housing recess of the other joint member when the two joint members are butted together. The guide ring portion has an outer diameter equal to the diameter of the outer peripheral surface of the retainer housing recess of the first joint member, and is fitted in the recess. Join the club and is characterized in more Rukoto the second joint retainer housing outer peripheral surface diameter smaller outer diameter guide portion which is fitted in the recess has a recess of the member.

  The retainer main body and the guide ring portion may be separate members, or the retainer main body and the guide ring portion may be integrally formed.

  In the fluid coupling described above, the gasket has an outer diameter larger than the outer diameter of the annular pressing portion for pressing the gasket, and has a small-diameter portion equal to the outer diameter of the annular protruding portion at a portion in contact with the first joint member. The retainer body has a small-diameter portion having the same inner diameter as the outer diameter of the small-diameter portion of the gasket, the portion on the connecting portion side of the small-diameter portion is fitted into the small-diameter portion of the gasket, and the remaining portion of the small-diameter portion is the first joint member And the guide ring part has an outer diameter substantially equal to the diameter of the outer peripheral surface of the retainer housing recess of the first joint member, and is fitted into the recess. Preferably, the second joint member includes a guide portion that has an outer diameter slightly smaller than the diameter of the outer peripheral surface of the retainer housing recess and is loosely fitted in the recess.

The retainer for holding a gasket according to the present invention includes a first and a second joint member in which a retainer receiving recess is provided on the abutting end surface, and a gasket pressing annular protrusion having an annular protrusion is provided on the bottom surface of the retainer receiving recess, respectively. A retainer for holding a gasket used in a fluid coupling having an annular gasket interposed between the annular projecting portions of both joint members, which holds the outer peripheral surface of the gasket and a retainer body which is attached to the annular protrusion periphery, Ri Na more a guide ring portion at the time of butt both joint members for guiding the retainer housing concavity outer peripheral surface of the other joint member, and the retainer body and the guide ring portion are formed integrally The gasket has an outer diameter that is larger than the outer diameter of the annular protrusion for holding the gasket and is in contact with the first joint member. The retainer body has a small-diameter portion having the same inner diameter as the outer diameter of the gasket small-diameter portion, and the portion on the connecting portion side of this small-diameter portion is the gasket. The guide ring portion is fitted to the outer peripheral surface of the retainer housing recess of the first joint member, and the remaining portion of the small diameter portion is fitted to the outer periphery of the annular protrusion of the first joint member. A fitting portion having a diameter and being fitted into the recess, and a guide portion having an outer diameter smaller than the diameter of the outer peripheral surface of the retainer housing recess of the second joint member and being fitted into the recess. and it is characterized in more Rukoto.

  According to the fluid coupling and the retainer for holding a gasket of the present invention, since the retainer can be held by either the first or second coupling member, it is possible to distinguish the joint end surface of the coupling member from the male type or the female type. The members can be connected sequentially. In addition, since the retainer has a guide ring portion that guides the concave peripheral surface of the joint member to which the retainer is not attached at the time of abutting both joint members, the radial direction of the other joint member with respect to one joint member The deviation is suppressed small.

  Embodiments of the present invention will be described below with reference to the drawings.

  In this specification, the upper, lower, left, and right refer to the upper, lower, left, and right of FIG. 2, and the preceding value refers to the chart side and the rear refers to the rear side of the figure. In addition, this up and down is for convenience, and may be upside down or lying down.

  1 and 2 show a part of a fluid control apparatus in which the fluid coupling of the present invention is used. The fluid control device (1) includes a plurality of block joints (5) (6) (7) (8) (9) (10) attached to the substrate (11), and these block joints (5) (6) (7) It is composed of a plurality of types of fluid controllers (2), (3) and (4) attached to (8), (9) and (10).

  The fluid controllers (2), (3), and (4) are, in order from the left, the first block valve (2), the mass flow controller (regulator) (3), and the second block valve (4). ) (6) (7) (8) (9) (10), in order from the left, block joint (5) with first V-shaped passage (5a) having an upward left opening and a right opening, upward A block joint (6) with a first L-shaped passage (6a) having a plurality of openings and a rear opening, a block joint (7) with a second V-shaped passage (7a) having an upward left opening and a right opening, respectively. A block joint (8) with a third V-shaped passage (8a) having an upward left opening and a right opening, respectively, and a block joint (9) with a second L-shaped passage (9a) having an upward opening and a rear opening. A block joint (10) with a third L-shaped passage (10a) having an upward opening and a rightward opening.

  A through hole (25) and a screw hole (26) are provided at predetermined positions of each block joint (5) (6) (7) (8) (9) (10). The passed bolt (not shown) is fixed to the board (11) by being screwed into a screw hole (not shown) of the board (11). In each fluid controller (2) (3) (4), the bolt (27) passed from above is connected to the screw hole (26) of the block joint (5) (6) (7) (8) (9) (10). ) Is fixed to the corresponding block joint (5) (6) (7) (8) (9) (10).

  The first block valve (2) includes a rectangular parallelepiped block main body (12) which is long to the left and right, a first actuator (13) and a second actuator (14) mounted on the upper surface of the main body (12), and a right side of the main body (12). A right block (15) with an inverted L-shaped passage (15a) attached to the surface and a rear block (16) with an inverted L-shaped passage (not shown) attached to the rear side of the main body, ) The left end is on the right half of the block joint (5) with the first V-shaped passage (5a), and the right block (15) is on the left half of the block joint (2) with the second V-shaped passage (7a) The rear block (16) is attached to the block joint (6) with the first L-shaped passage (6a).

  The main body (12) of the first block valve (2) has a first inflow passage (31) that opens downward at the left end and communicates with the right opening of the block joint (5) with the first V-shaped passage (5a). ), The first inflow path (31) through the first actuator (13), and the outflow path (32) leading to the rightward passage of the inverted L-shaped path (15a) of the right block (15), and the outflow path There is provided a downward second inflow passage (33) that is continuous with the second actuator (14) and communicates with the upward opening of the block joint (6) with the first L-shaped passage (6a). A downward passage of the inverted L-shaped passage (15a) of the right block (15) communicates with the left opening of the block joint (7) with the second V-shaped passage (7a).

  A left block (17) having an inverted L-shaped passage (17a) communicating with the inflow passage (not shown) of the regulator (3) projects to the left at the lower end of the left side surface of the regulator (3). The right block (18) having an inverted L-shaped passage (18a) communicating with the outflow passage (not shown) of the regulator is provided at the lower end of the right side surface of the regulator (3). Overhangs. The left passage block (17) is attached to the right half of the block joint (7) with the second V-shaped passage, so that the inverted L-shaped passage (17a) of the left block (17) and the first block valve ( 2) The inverted L-shaped passage (15a) of the right block (15) communicates with the block joint (7) with the second V-shaped passage (7a). The right block (18) of the adjuster (3) is attached to the left half of the block joint (8) with the third V-shaped passage (8a).

  The second block valve (4) includes a rectangular parallelepiped block main body (19) which is long to the left and right, a third actuator (20) and a fourth actuator (21) mounted on the upper surface of the main body (19), and a right side of the main body (19). It consists of a right block (22) with an inverted L-shaped passage (22a) attached to the surface and a rear block (23) with an inverted L-shaped passage attached to the rear side of the main body, and the left end of the main body (19) is In the right half of the block joint (8) with the third V-shaped passage (8a), the right block (22) is in the block joint (10) with the third L-shaped passage (10a) and the rear block (23) is in the second L Each is attached to a block joint (9) with a letter-shaped passage (9a). A fluid outflow portion (24) is provided in the rightward opening of the block joint (10) with the third L-shaped passage (10a).

  The main body (19) of the second block valve (4) has an inflow passage (34) that opens downward at the left end and communicates with the right opening of the block joint (8) with the third V-shaped passage (8a). A first outflow path (35) connected to the inflow path (34) via the third actuator (20) and leading to the rightward passage of the inverted L-shaped path (22a) of the right block (22), and the first outflow path A downward second outflow passage (36) is provided which is connected to the upper joint (35) via the fourth actuator (21) and communicates with the upward opening of the block joint (9) with the second L-shaped passage (9a). The right block (22) with the inverted L-shaped passage (22a) of the second block valve (4) and the block joint (10) with the third L-shaped passage (10a) are communicated with each other.

  Each member (5) (2) (6) (15) (7) (17) (18) (8) (4) (9) (22) (10) A joint (30) is provided.

  Referring to FIG. 3, a block joint (5) with a first V-shaped passage (5a) (hereinafter referred to as a first joint member) and a main body (12) of a first block valve (2) (hereinafter referred to as a second joint) A first embodiment of a fluid coupling according to the present invention provided between the first and second members will be described.

  The fluid coupling includes a first coupling member (5) having a first flow path (5a) and a second coupling member (12) having a second flow path (31) communicating with the first flow path (5a). The joint members (5) (12) and the annular gasket (41) interposed between the butted end faces of the joint members (5) (12). In the illustrated example, the gasket (41) is held and the gasket is held by the first joint member (5), and the guide ring (44) attached to the outside of the retainer body (43). ) And a screw means for connecting the joint members (5) and (12).

  At the butted end faces of the first joint member (5) and the second joint member (12), annular retainer storage recesses (45) (46) surrounding the openings of the fluid passages (5a) (31) are provided. Gasket pressing annular protrusions (47), (48) with annular protrusions (47a), (48a) are provided on the bottom surfaces of the storage recesses (45), (46). The retainer housing recesses (45) and (46), the annular protrusions (47a) and (48a), and the annular protrusions (47) and (48) are concentric with each other. The front end surfaces of the annular protrusions (47) and (48) are recessed slightly shallower than half the thickness of the gasket (41) from the abutting end surfaces, and the annular protrusions (47a) and (48a) are formed in the annular protrusions (47) ( 48) is provided at substantially the center in the radial direction of the tip surface. The retainer housing recesses (45) and (46) and the gasket pressing annular protrusions (47) and (48) have the same shape in the first joint member (5) and the second joint member (12). Is formed.

  The gasket (41) is made of stainless steel, has an inner diameter equal to the flow path diameter of both joint members (5) and (12), and has an outer diameter slightly larger than the outer diameter of the annular protrusions (47) and (48) for holding the gasket. Have. A portion of the gasket (41) in contact with the first joint member (5) is provided with a small diameter portion (41a) equal to the outer diameter of the gasket pressing annular protrusions (47) and (48).

  The retainer body (43) is integrally formed of a stainless steel plate, and has a small diameter portion (43a) having the same inner diameter as the outer diameter of the gasket small diameter portion (41a), and a large diameter portion (43b) larger than this. ) And a connecting portion (43c) that connects one end of the small diameter portion (43a) and the other end of the large diameter portion (43b). The stainless steel plate is a thin plate, and both the small diameter portion (43a) and the large diameter portion (43b) have some radial elasticity. The portion on the connecting portion side of the small diameter portion (43a) is fitted into the gasket small diameter portion (41a), and the remaining portion of the small diameter portion (43a) is the outer periphery of the annular projecting portion (47) of the first joint member (5). Are fitted together. The large-diameter portion (43b) is formed to have a size such that a gap is formed between the large-diameter portion (43b) and the outer periphery of the gasket (41) and the outer periphery of the retainer housing recesses (45) and (46).

  The guide ring (44) is made of stainless steel and has an outer diameter substantially equal to the diameter of the outer peripheral surface of the retainer housing recess (45) of the first joint member (5) and is fitted into the recess (45). A fitting portion (51) having a small outer diameter slightly smaller than the diameter of the outer peripheral surface of the retainer housing recess (46) of the second joint member (12) and being loosely fitted in the recess (51). 52). The inner diameter of the guide portion (52) is substantially equal to the outer diameter of the large diameter portion (43b) of the retainer body (43). The upper part of the inner peripheral surface of the fitting part (51) is flush with the inner peripheral surface of the guide part (52), and the lower part is below the radially outer part of the connecting part (43c) of the retainer body (43). An annular inward protrusion (53) that abuts from is provided. In addition, an annular small protrusion (54) that comes into contact with the upper end of the large diameter portion (43b) of the retainer body (43) is provided at the upper end portion of the guide portion (52). The total vertical width of the retainer body (43) and the guide ring (44) is determined by the depth of the retainer housing recess (45) of the first joint member (5) and the retainer housing recess (46 of the second joint member (12)). ) Is slightly smaller than the combined value.

  In this embodiment, the retainer body (43) and the guide ring (44) are formed separately, and the retainer body (43) is fitted into the guide ring (44) from above, so that both (43) The retainer (42) is formed by combining (44). Further, the retainer (42) and the gasket (41) are held by the first joint member (5) in a state where the gasket (41) is fitted to the retainer main body (43) of the retainer (42), and the gasket (41) Positioning is performed. The second joint member (12) is abutted against the first joint member (5) holding the retainer (42) and the gasket (41). At this time, the second joint member (12) is connected to the guide ring (44). Guided by the guide section (52).

  FIG. 3A shows a state in which the second joint member (12) is normally butted against the first joint member (5). In this state, 0.15 mm between the outer peripheral surface of the guide portion (52) of the guide ring (44) and the outer peripheral surface of the retainer housing recess (46) of the second joint member (12). A gap (G) is formed. In the retainer housing recess (45) of the first joint member (5), the insertion portion (51) of the guide ring (44) is fitted to the outer peripheral surface of the recess (45), and the small diameter of the retainer body (43) The portion (43a) is fitted on the outer periphery of the annular protrusion (47), and the retainer (42) and the gasket (41) do not move in the radial direction. FIG. 3B shows a state where the butting of the second joint member (12) with respect to the first joint member (5) is most shifted in the radial direction. That is, a gap of 0.3 mm (at a certain position) exists between the outer peripheral surface of the guide portion (52) of the guide ring (44) and the outer peripheral surface of the retainer housing recess (46) of the second joint member (12). G1) is formed, and the gap (G2) between the position and the position 180 ° apart is zero. However, since the annular protrusion (48a) that strongly presses the gasket (41) is provided at the substantially center in the radial direction of the tip surface of the annular protrusion (48), the annular protrusion (48a) will be (41) does not deviate, and problems such as deterioration in sealing performance do not occur at all. The distance between the inner periphery of the annular protrusion (48a) and the inner periphery of the gasket (41) in the most shifted state is, for example, 0.56 mm on the one hand and 0.26 mm on the other hand.

  According to the fluid coupling, the retainer (42) can be held by either the first or second coupling member (5) (12). Therefore, when assembling the fluid control device (1) shown in FIGS. Whether the end face of each component (2) (4) (5) (6) (7) (8) (9) (10) (15) (17) (18) (22) is male or female These can be sequentially connected without distinguishing between them. Since the second joint member (12) is guided by the guide portion (52) of the guide ring (44) and is abutted against the first joint member (5), the second joint member (12) can be easily assembled. The amount of movement of the member (12) in the radial direction relative to the first joint member (5) can be suppressed to an extremely small value. In addition, the gasket (41) is most deformed at a position in contact with the annular protrusions (47a) and (48a), but this position is not the inner edge of the gasket (41) end face, but is more outward than the inner edge. The most deformed portion of the gasket (41) is shifted outward from the inner edge. Therefore, wrinkles do not occur in the inner peripheral portion of the gasket (41), so there is no concern that dust will accumulate.

  FIG. 4 shows a second embodiment of the fluid coupling according to the present invention. In this fluid coupling, the configuration of the guide ring of the retainer and the configuration of the retainer housing recess of the second coupling member are different from those of the first embodiment. The structure of 2nd Embodiment except these is the same as that of 1st Embodiment, and attaches | subjects the same code | symbol to the same thing, and abbreviate | omits description.

  The guide ring (62) of the retainer (61) of the second embodiment is made of stainless steel and has an outer diameter substantially equal to the diameter of the outer peripheral surface of the retainer receiving recess (45) of the first joint member (5). The recessed portion (63) fitted in the recessed portion (45) has an outer diameter slightly smaller than the diameter of the outer peripheral surface of the retainer receiving recessed portion (67) of the second joint member (12). And a guide part (64) loosely fitted in (67).

  The retainer receiving recess (67) of the second joint member (12) is larger in diameter and deeper than the retainer receiving recess (45) of the first joint member (5) as shown in FIG. Has been made.

  The inner diameter of the guide part (64) is substantially equal to the outer diameter of the large diameter part (43b) of the retainer body (43), and the outer diameter is larger than the outer diameter of the fitting part (63). . The upper part of the inner peripheral surface of the fitting part (63) is flush with the inner peripheral surface of the guide part (64), and the lower part is below the radially outer part of the connecting part (43c) of the retainer body (43). An annular inward projection (65) that abuts from is provided. Further, an annular inward projecting portion (66) is provided at the upper end portion of the guide portion (64) so as to contact the upper end of the large diameter portion (43b) of the retainer main body (43) from above. The height of the annular inward protruding portion (66) at the upper end of the guide portion (64) is set low so as not to prevent the retainer body (43) from being fitted into the guide ring (62). The total vertical width of the guide ring (62) matches the depth of the retainer receiving recess (45) of the first joint member (5) and the depth of the retainer receiving recess (67) of the second joint member (12). It is made slightly smaller than the value.

  FIG. 4A shows a state in which the second joint member (12) is normally butted against the first joint member (5). In this state, the distance between the outer peripheral surface of the guide portion (64) of the guide ring (62) and the outer peripheral surface of the retainer storage recess (67) of the second joint member (12) is 0.25 mm. A gap (G) is formed. In the retainer housing recess (45) of the first joint member (5), the fitting portion (63) of the guide ring (62) is fitted to the outer peripheral surface of the recess (45), and the small diameter of the retainer body (43) The portion (43a) is fitted on the outer periphery of the annular projecting portion (47), and the retainer (61) and the gasket (41) do not move in the radial direction. FIG. 4B shows a state where the butting of the second joint member (12) with respect to the first joint member (5) is most shifted in the radial direction. That is, a gap of 0.5 mm (at a certain position) exists between the outer peripheral surface of the guide portion (64) of the guide ring (62) and the outer peripheral surface of the retainer housing recess (67) of the second joint member (12). G1) is formed, and the gap (G2) between the position and the position 180 ° apart is zero. However, since the annular protrusion (48a) that strongly presses the gasket (41) is provided at the substantially center in the radial direction of the tip surface of the annular protrusion (48), the annular protrusion (48a) will be (41) does not deviate, and problems such as deterioration in sealing performance do not occur at all. The distance between the inner periphery of the annular protrusion (48a) and the inner periphery of the gasket (41) in the most shifted state is, for example, 0.65 mm on the one hand and 0.15 mm on the other hand.

  In the joint of the second embodiment, the retainer (61) can hold only the first joint member (5) and the guide ring (62) in both the radial direction and the axial direction as compared with the first embodiment. This is different from the enlarged one, and has the advantage that the rigidity of the guide ring (62) is increased.

  FIG. 5 shows a third embodiment of a fluid coupling according to the present invention. This fluid coupling is different from the first embodiment only in the configuration of the retainer. The structure of 3rd Embodiment except these is the same as that of 1st Embodiment, and attaches | subjects the same code | symbol to the same thing, and abbreviate | omits description.

  In the retainer (71) of the third embodiment, the retainer main body portion (72) and the guide ring portion (73) are integrally formed of stainless steel.

  The retainer body portion (72) has the same inner diameter as the outer diameter of the gasket small diameter portion (41a), holds the outer peripheral surface of the gasket small diameter portion (41a), and the annular protrusion (47) of the first joint member (5). The guide ring part (73) is a part attached to the outer periphery, and is continuous with the outer periphery of the retainer body part (72) and is substantially equal to the diameter of the peripheral surface of the retainer housing recess (45) of the first joint member (5). It has an outer diameter that is slightly smaller than the diameter of the peripheral surface of the retainer receiving recess (46) of the fitting portion (74) and the second joint member (12) that has an outer diameter and is fitted in the recess (45). The guide portion (75) is loosely fitted in the recess (46).

  The inner diameter of the guide part (75) is made larger than the outer diameter of the gasket (41). The total width of the guide ring portion (73) in the vertical direction depends on the depth of the retainer receiving recess (45) of the first joint member (5) and the depth of the retainer receiving recess (67) of the second joint member (12). It is made slightly smaller than the combined value.

  FIG. 5A shows a state in which the second joint member (12) is normally butted against the first joint member (5). In this state, the distance between the outer peripheral surface of the guide portion (75) of the guide ring portion (73) and the peripheral surface of the retainer storage recess (67) of the second joint member (12) is 0.25 mm at any position. The gap (G) is formed. In the retainer housing recess (45) of the first joint member (5), the fitting portion (74) of the guide ring portion (73) is fitted to the circumferential surface of the recess (45), and the retainer body (43) The small diameter portion (43a) is fitted on the outer periphery of the annular protrusion (47), and the retainer (71) and the gasket (41) do not move in the radial direction. FIG. 5B shows a state where the butting of the second joint member (12) with respect to the first joint member (5) is most shifted. That is, a gap of 0.3 mm is provided at a certain position between the outer peripheral surface of the guide portion (75) of the guide ring portion (73) and the peripheral surface of the retainer housing recess (46) of the second joint member (12). (G1) is formed, and the gap (G2) between this position and the position 180 ° apart is zero. However, since the annular protrusion (48a) that strongly presses the gasket (41) is provided at the substantially center in the radial direction of the tip surface of the annular protrusion (48), the annular protrusion (48a) will be (41) does not deviate, and no problems such as a decrease in sealing performance occur. The distance between the inner periphery of the annular protrusion (48a) and the inner periphery of the gasket (41) in the most shifted state is, for example, 0.56 mm on the one hand and 0.26 mm on the other hand.

  The joint of the third embodiment is different from that of the first embodiment in that the retainer body part (72) and the guide ring part (73) are integrated, and the number of parts constituting the fluid joint is reduced. This has the advantage that the work of fitting the retainer body into the guide ring can be eliminated. On the other hand, the first embodiment has the advantage that the specification can be finely adjusted such that the guide ring (44) is made of material that emphasizes strength and the retainer body (43) is made of material that emphasizes elasticity. ing.

It is a disassembled perspective view of the fluid control apparatus using the fluid coupling by this invention. It is a longitudinal cross-sectional view of the control apparatus shown by FIG. It is an expanded sectional view showing a 1st embodiment of a fluid coupling. It is an expanded sectional view showing a 2nd embodiment of a fluid coupling. It is an expanded sectional view showing a 3rd embodiment of a fluid coupling. It is sectional drawing of the conventional fluid coupling.

Explanation of symbols

(5) First joint member
(5a) Fluid passage
(12) Second joint member
(31) Fluid passage
(41) Gasket
(41a) Small diameter part
(42) Retainer
(43) Retainer body
(43a) Small diameter part
(43b) Large diameter part
(44) Guide ring
(45) Retainer storage recess
(46) Retainer storage recess
(47) Annular protrusion
(47a) Annular projection
(48) Annular protrusion
(48a) Annular projection
(51) Insertion section
(52) Guide
(61) Retainer
(62) Guide ring
(63) Insertion section
(64) Guide
(67) Retainer storage recess
(71) Retainer
(72) Retainer body
(73) Guide ring
(73) Insertion section
(74) Guide

Claims (4)

In a fluid coupling comprising first and second coupling members having fluid passages communicating with each other, an annular gasket interposed between the butted end surfaces of both coupling members, and a retainer that holds the gaskets, Retainer storage recesses are provided on the butt end face of each joint member, and an annular protrusion for holding the gasket with an annular protrusion is provided on the bottom surface of each retainer storage recess, and the retainer holds the outer peripheral surface of the gasket. a retainer body which is attached to the annular projection the outer periphery of one of the joint members, Ri both joint members name more a guide ring portion for guiding the retainer housing concavity outer peripheral surface of the other joint member at the time of butt, the guide ring portion, A fitting portion having an outer diameter equal to the diameter of the outer peripheral surface of the retainer housing recess of the first joint member; Over Na housing concavity fluid coupling, wherein more Rukoto a guide portion having a diameter smaller than the outer diameter of the outer circumferential surface are fitted into the recess.   The fluid coupling according to claim 1, wherein the retainer main body and the guide ring portion are integrally formed. The gasket has an outer diameter larger than the outer diameter of the annular protrusion for holding the gasket, and a small diameter portion equal to the outer diameter of the annular protrusion at the portion in contact with the first joint member. The small-diameter portion has a small-diameter portion having the same inner diameter as the outer diameter of the small-diameter portion, and the portion on the coupling portion side of the small-diameter portion is fitted into the small-diameter portion of the gasket, and the remaining portion of the small-diameter portion claim 1 or 2 of the fluid coupling, characterized in that are mating et al. Between the first and second joint members each having a retainer receiving recess on the butt end face and an annular protrusion for pressing the gasket with an annular protrusion on the bottom surface of the retainer receiving recess, and the annular protrusions of both joint members A retainer body for holding a gasket used in a fluid coupling having an annular gasket interposed between the retainer body and the outer peripheral surface of the gasket to be attached to the outer periphery of the annular protrusion of one of the joint members If, Ri Na more a guide ring portion at the time of butt both joint members for guiding the retainer housing concavity outer peripheral surface of the other joint member and the retainer body and the guide ring portion is integrally formed, the gasket, gasket retainer A small-diameter portion having an outer diameter larger than the outer diameter of the annular projecting portion and equal to the outer diameter of the annular projecting portion is formed in a portion in contact with the first joint member The retainer body has a small diameter portion having the same inner diameter as the outer diameter of the gasket small diameter portion, and the portion on the connecting portion side of the small diameter portion is fitted to the gasket small diameter portion, and the remaining portion of the small diameter portion is the first portion. The fitting portion is fitted to the outer periphery of the annular projecting portion of the one joint member, and the guide ring portion has an outer diameter equal to the diameter of the outer peripheral surface of the retainer housing recess of the first joint member and is fitted in the recess. When the gasket used in the fluid coupling, wherein more Rukoto a second joint outer peripheral surface diameter is smaller than the outside diameter fitted in the recess has placed its dependent guiding portion of the retainer housing concavity member Retainer for holding.

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