JP6417496B1 - Pipe member - Google Patents

Abstract

A tubular member is provided in which a tubular window member can be removed without removing the tubular member from a fluid piping member.
The pipe member 100 is incorporated between fluid piping members to form part of the fluid piping. The tube member 100 includes a tube member main body 102, a tubular window member 104, and a holding member 106. The tubular window member 104 is made of a transparent material, and the inner flow path 112 and the blade member 108 are visible from the outside. The tubular window member 104 is held at a position where it is incorporated in the tube member main body 102 by the holding member 106. By moving the holding member 106 rearward from the holding position to the release position, the holding member 106 moves away from the tubular window member 104 and the holding of the tubular window member 104 is released. Thereby, the tubular window member 104 can be removed from the tube member main body 102 through the side opening 130.
[Selection] Figure 1

Description

  The present invention relates to a pipe member that is incorporated between fluid piping members and constitutes a part of the fluid piping, and more particularly relates to a pipe member that is capable of confirming the flow of fluid in the fluid piping. .

  In order to visually confirm the flow of the fluid in the fluid piping, a pipe member is known in which the inside of the flow path can be visually recognized from a portion made of a transparent material. For example, a flow sensor disclosed in Patent Document 1 includes a transparent tube, a fitting screwed to both ends thereof, and a turbine unit mounted in the tube. When a fluid flows in the tube, the turbine unit is By displacing in the rotational direction and the axial direction according to the flow rate, and reading the displacement amount of the turbine, the flow of the fluid and the flow rate thereof can be measured.

JP 58-9025 A

  In the flow rate sensor as described above, the inner peripheral surface of the tube is gradually soiled by the fluid passing through the transparent tube and solids contained therein as the use continues, and the visibility inside the flow path deteriorates. Sometimes. In such a case, the transparent tube is taken out and the inside thereof is cleaned or replaced with a new tube. However, in the conventional pipe member such as the above-described flow sensor, in order to remove the transparent tube serving as the tubular window member, it is necessary to remove the pipe member itself from the fluid piping member and further disassemble the pipe member. Such work is very complicated and time consuming.

  Therefore, an object of the present invention is to provide a tube member that allows the tubular window member to be removed without removing the tube member from the fluid piping member.

That is, the present invention
A pipe member that is incorporated between fluid piping members and constitutes a part of the fluid piping,
A tube member body defining a first passage, the tube member body having a side opening that communicates with the first passage from the side with respect to the longitudinal axis of the first passage;
A tubular window member incorporated into the tube member main body through the side opening, and a second passage that communicates with the first passage and constitutes a flow path of the tube member when incorporated into the tube member main body. And a tubular window member that is at least partly made of a transparent material and is visible through the at least part.
A holding member attached to the tube member body, the holding member engaging with the tubular window member to hold the tubular window member in a position incorporated in the tube member body; and apart from the tubular window member A holding member disengaged between a release position in which the holding to the tubular window member is released and the tubular window member is removable from the tubular member body through the side opening;
A tube member is provided.

  In the tube member, the tubular window member can be removed through the side opening of the tube member main body. Therefore, the tube member itself needs to be removed from the fluid piping member in order to remove the tubular window member as in the prior art. There is no.

Preferably,
The holding member is attached to the tube member body slidably in the direction of the longitudinal axis between the holding position and the release position;
When the tubular window member is in a state where the holding member is in the release position, the tubular window member is displaced in the direction of the longitudinal axis from the incorporation position where the tubular member body is incorporated in the tube member main body, and the first passage and It is possible to displace between the communication release position where the communication with the second passage is released,
The tubular window member may be removable from the tube member body through the side opening in the communication release position.

Also preferably,
The tube member body has a cylindrical front portion and a rear portion, and an intermediate portion between the front portion and the rear portion, and the side opening is formed in the intermediate portion,
The tubular window member is adapted to sealingly engage the front portion in alignment with the tube member body in the longitudinal axis in the installed position;
The holding member is a cylindrical member having a third passage, and in the holding position, the tubular window member and the rear portion are sealingly engaged, and the third passage is the first passage and the second passage. The flow path of the pipe member can be configured together with the passage.

  Furthermore, the holding member can be removable from the tube member body through the side opening in a state where the tubular window member is detached from the tube member body.

  Such a configuration facilitates cleaning and replacement of the holding member.

Preferably,
The holding member has a protruding portion protruding radially outward from the outer peripheral surface of the holding member, and the tube member main body has a receiving recess for receiving the protruding portion;
The holding member is rotatable about the longitudinal axis with respect to the tube member body when in the holding position, and the protrusion is aligned with the receiving recess in the direction of the longitudinal axis. When in the rotation position, the protrusion is displaceable to the release position while being received in the receiving recess, and when not in the alignment rotation position, the protrusion interferes with the tube member main body to cause the release position. It is possible to prevent displacement.

  With such a configuration, it is possible to prevent the holding member from being erroneously displaced from the holding position to the release position by shifting the holding member from the alignment rotation position.

Preferably,
The projecting portion has a locking extension extending along the outer peripheral surface of the tube member main body, and includes an outer peripheral surface of the tube member main body and an inner surface of the locking outer extension facing the outer peripheral surface. A locking projection is provided on one of the sides, and a locking recess is provided on the other side. When the holding member is rotated from the alignment rotation position to the locking rotation position at the holding position, The protrusion and the engaging recess can be engaged with each other so that the rotation of the holding member can be suppressed.

Or instead of the above configuration,
The protrusion has a locking projection on a sliding engagement surface that is slidably engaged with the tubular window member,
The tubular window member has a locking recess for receiving the locking projection;
When the holding member is rotated from the alignment rotation position to the locking rotation position at the holding position, the locking projection and the locking recess are engaged to suppress the rotation of the holding member. Can be.

  In this case, a flexible portion having flexibility in the direction of the longitudinal axis is provided on the sliding engagement surface of the holding member, and the locking protrusion is provided on the flexible portion. Can be.

  With such a configuration, the holding member can be prevented from being erroneously rotated from the locking rotation position toward the alignment rotation position, so that the holding member can be more reliably prevented from being erroneously displaced to the release position. Is possible.

Preferably,
The tube member body has a guide surface formed at a side edge of the side opening and extending in the direction of the longitudinal axis, and the tubular window member protrudes radially outward from the outer peripheral surface of the tubular window member. Has a guide,
When the tubular window member is inserted into the first passage from the side opening and is set to the communication release position, the guide portion comes into contact with the guide surface and the tubular window member is in contact with the tube member main body. Thus, when the tubular window member is displaced from the communication release position to the installation position, the guide portion can slide on the guide surface.

  Such a configuration facilitates alignment when the tubular window member is attached to the tube member body.

  Preferably, a flow display member disposed in the second passage of the tubular window member and displaced by a fluid flowing in the flow path can be further provided.

  Specifically, the flow display member is a blade member rotatably attached to the tubular window member in a circumferential direction with respect to the longitudinal axis, and is removed from the tube member body together with the tubular window member. Can do.

  By having such a flow display member, the presence or absence of the flow of fluid in the flow path of the tube member can be easily visually confirmed. Further, since the blade member is also removed together, the blade member can be easily cleaned and replaced.

  Preferably, the tubular window member has a window outer peripheral surface exposed to the outside when the tubular window member is incorporated in the tube member main body, and a window inner peripheral surface positioned radially inward of the window outer peripheral surface. The inside of the two passages is visible through the window outer peripheral surface and the window inner peripheral surface, and the window outer peripheral surface is such that the center of curvature of the window outer peripheral surface is the center of curvature of the window inner peripheral surface and the window outer peripheral surface. It can be made to be shaped to be in a position between the surfaces. Specifically, the cross section of the window outer peripheral surface and the window inner peripheral surface can each be arcuate.

  Since the outer peripheral surface of the window and the inner peripheral surface of the window are shaped as described above, the blade member disposed in the tubular window member appears to be greatly enlarged, and thus the rotation of the blade member is further increased. It can be easily confirmed.

  Preferably, the side opening includes first and second side openings formed at positions opposed to each other in the radial direction of the first passage, and the tubular window member has first and second side portions. It can be attached to the tube member body through any of the openings.

  When there is only one side opening, when the pipe member is attached between the fluid piping members, the side opening is directed to the wall side and it may be difficult to attach / remove the tubular window member. It can happen. Providing two side openings at positions facing each other in the radial direction can reduce the possibility of such a state.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe member according to the present invention will be described with reference to the accompanying drawings.

It is a perspective view which shows the assembly state of the pipe member which concerns on the 1st Embodiment of this invention. FIG. 2 is an exploded perspective view of parts of the pipe member of FIG. 1. It is a top view of the pipe member of FIG. It is a side view of the pipe member of FIG. It is sectional drawing in the VV line | wire of FIG. It is sectional drawing in the VI-VI line of FIG. It is a 1st figure which shows attachment / detachment operation of the tubular window member in the pipe member of FIG. 1, and is a figure which shows the state by which the holding member was set to the alignment rotation position. It is a 2nd figure which shows attachment / detachment operation of the tubular window member in the pipe member of FIG. 1, and is a figure which shows the state by which the holding member was made into the release position. It is a 3rd figure which shows attachment / detachment operation of the tubular window member in the tube member of FIG. 1, and is a figure which shows the state by which the tubular window member was made into the communication cancellation | release position. It is a 4th figure which shows attachment / detachment operation of the tubular window member in the tube member of FIG. 1, and is a figure which shows the state by which the tubular window member is removed from the tube member main body. It is a 5th figure which shows attachment / detachment operation of the tubular window member in the pipe member of FIG. 1, and is a figure which shows the state by which the holding member was pulled out from the pipe member main body. It is a 6th figure which shows attachment / detachment operation of the tubular window member in the pipe member of FIG. 1, and is a figure which shows the state from which the holding member is removed from the pipe member main body. It is sectional drawing of the member for visual recognition, and is a figure which shows the state which is removed from the pipe member main body and the blade member is made into the 2nd position. FIG. 14 is a view showing the flow of FIG. 13, wherein the blade member is removed from the tubular window member. It is sectional drawing in the XV-XV line | wire of FIG. It is side surface sectional drawing of the pipe member which concerns on the 2nd Embodiment of this invention. It is a perspective view of a pipe member concerning a 3rd embodiment of the present invention. It is a perspective view of a pipe member concerning a 4th embodiment of the present invention. FIG. 19 is an exploded perspective view of the tubular window member, the blade member, and the holding member in the tube member of FIG. 18. It is the disassembled perspective view seen from the different direction of the tubular window member of FIG. 19, a blade | wing member, and a holding member. It is side surface sectional drawing of the pipe member of FIG. It is a cross-sectional view of the tube member main body in the tube member of FIG. It is a side view of the blade member in the pipe member of FIG. It is a front view of the blade member of FIG. It is side surface sectional drawing of the pipe member which concerns on the 5th Embodiment of this invention. It is a perspective view of a pipe member concerning a 6th embodiment of the present invention. FIG. 27 is an exploded perspective view of a tubular window member, a blade member, and a holding member in the tube member of FIG. 26. It is the disassembled perspective view seen from the different direction of the tubular window member of FIG. 27, a blade | wing member, and a holding member. It is side surface sectional drawing of the pipe member of FIG. It is a cross-sectional view of the tube member main body in the tube member of FIG.

  As shown in FIGS. 1 to 4, the pipe member 100 according to the first embodiment of the present invention includes a pipe member main body 102 to which fluid piping members (not shown) are respectively connected at both ends, and a pipe member main body 102. A tubular window member 104 and a holding member 106 attached, and a blade member 108 attached to the tubular window member 104. The said pipe member 100 is integrated between fluid piping members, and comprises a part of fluid piping. The tubular window member 104 is entirely made of a transparent material, and the flow window member 110 is composed of the tubular window member 104 and the blade member 108. The vane member 108 disposed inside the tubular window member 104 is visible from the outside through the transparent tubular window member 104. The blade member 108 is rotated by the flow of fluid in the flow path 112 of the tube member 100, and by visually confirming the rotation of the blade member 108 through the transparent tubular window member 104, The presence or absence of fluid flow can be confirmed.

  The tube member main body 102 includes a cylindrical front portion 114, a cylindrical rear portion 116, and an intermediate portion 118 therebetween. As shown in FIG. 5, the tube member body 102 defines a first passage 124 that extends from the front opening 120 of the front portion 114 to the rear opening 122 of the rear portion 116. Each of the front portion 114 and the rear portion 116 is formed with a female screw portion 126 for fixing the fluid piping member. In addition, as shown in FIG. 2, the intermediate portion 118 has two struts 128 that connect the front portion 114 and the back portion 116, and the radial direction of the first passage 124 is between these struts 128. Opposing first side opening 130 and second side opening 132 are formed. These side openings 130 and 132 are opened to communicate with the first passage 124 from the side with respect to the longitudinal axis L of the first passage 124. The rear portion 116 and the intermediate portion 118 are formed as an integral member, and the front portion 114 is a member separate from the rear portion 116 and the intermediate portion 118 and rotates about the longitudinal axis L with respect to the intermediate portion 118. It is attached as possible. With such a configuration, when the fluid piping member is fixed to the other female screw portion 126 in a state where the fluid piping member is already fixed to one female screw portion 126 of the front portion 114 and the rear portion 116. Since the other pipe can be rotated with respect to the fluid pipe member to be attached next, the other female thread portion 126 can be fixed to the pipe flow path member without rotating the pipe flow path member. become able to. In addition, when the user visually recognizes the blade member 108 through the tubular window member 104, the rotation direction position of the intermediate portion 118 can be changed so that the support column 128 does not interfere with visual recognition.

  The tubular window member 104 has a cylindrical peripheral wall portion 134 and defines a second passage 136 inside thereof as shown in FIG. As shown in FIG. 6, the front end portion 138 of the peripheral wall portion 134 is provided with a shaft support portion 140 extending so as to traverse the second passage 136 in the radial direction, and from the vicinity of the center of the shaft support portion 140. A rotating shaft 142 is provided that extends rearward (leftward in the drawing) in the direction of the longitudinal axis L. The tubular window member 104 is incorporated in the tube member main body 102 in the assembled state, and the front end portion 138 of the peripheral wall portion 134 is inserted into the front portion 114 of the tube member main body 102 so that the tube member main body 102 and the longitudinal axis L The position is aligned in the direction of. Further, the front end portion 138 is sealingly engaged with the inner peripheral surface 114 a of the front portion 114, and the second passage 136 of the tubular window member 104 is in communication with the first passage 124 in the front portion 114 of the tube member body 102. ing.

  The blade member 108 includes a main body portion 144 that extends in the direction of the longitudinal axis L, and two blades 146 that are spirally formed on the outer peripheral surface 144 a of the main body portion 144. The main body portion 144 of the blade member 108 constitutes a cylindrical shaft holding portion 144 that holds the rotating shaft 142 of the tubular window member 104. The shaft holding portion (main body portion) 144 holds the rotation shaft 142 of the tubular window member 104 so as to be relatively rotatable. Accordingly, the blade member 108 is rotatable with respect to the rotation shaft 142 around the rotation center axis C. In the assembled state, as shown in FIGS. 5 and 6, the blade member 108 is entirely located in the second passage 136 of the tubular window member 104.

  The holding member 106 has a cylindrical peripheral wall portion 148, and defines a third passage 150 inside thereof as shown in FIG. 5. The front end surface 148 a of the peripheral wall portion 148 is provided with a blade support portion 152 extending so as to cross the third passage 150 in the radial direction. 154 is supported from behind. In the assembled state, the holding member 106 has a rear end portion 156 inserted into the rear portion 116 of the tube member body 102 and is aligned with the tube member body 102 in the direction of the longitudinal axis L. The rear end 156 is in sealing engagement with the inner peripheral surface 116 a of the rear portion 116 of the tube member main body 102, and the front end 158 is in sealing engagement with the rear end 160 of the tubular window member 104. As a result, the third passage 150 of the holding member 106 communicates with the first passage 124 and the second passage 136, and constitutes the flow path 112 of the pipe member 100 together with the first passage 124 and the second passage 136. . As shown in FIGS. 1 and 2, the holding member 106 further includes two projecting portions 162 projecting radially outward from the outer peripheral surface 148 b of the peripheral wall portion 148, and the projecting portions 162 are formed on the tube member main body 102. There is a locking extension 164 extending along the outer peripheral surface 102a. The locking outer extension 164 is provided with a through hole (locking recess) 166 penetrating to the inner surface thereof, and this through hole 166 is a ball press-fitted onto the outer peripheral surface 102a of the tube member main body 102 in the assembled state. (Locking protrusion) 168 is received so that the position of the holding member 106 in the rotation direction with respect to the tube member main body 102 is held. As will be described later, the holding member 106 is slidable in the direction of the longitudinal axis L and the rotational direction around the longitudinal axis L with respect to the tube member main body 102, as shown in FIGS. 1, 3, and 4. As shown, when the through hole 166 of the locking extension 164 is in the locking rotation position where the ball 168 is locked, rotation in the circumferential direction is suppressed by the engagement of the through hole 166 and the ball 168. At the same time, the projecting portion 162 interferes with the tube member main body 102 so that the tubular window member 104 is displaced rearward in the direction of the longitudinal axis L from the holding position where the tubular window member 104 is held in the tube member main body 102. I can't. The through hole 166 as the locking recess and the ball 168 as the locking protrusion may be arranged in reverse, or may be configured to engage with each other by a configuration other than the through hole 166 and the ball 168. .

  The tubular member 100 is configured such that the tubular window member 104 can be attached and detached while the fluid piping member is connected and fixed to the tube member main body 102 and incorporated in the fluid piping. The procedure for removing the tubular window member 104 is as follows.

  First, in the assembled state of FIG. 4, a force in a rotational direction is applied to the holding member 106 so that the engagement between the through hole 166 of the holding member 106 and the ball 168 of the tube member main body 102 that are engaged with each other is released. Thus, the engagement is released, and the holding member 106 is rotated from the locking rotation position of FIG. 4 to the alignment rotation position of FIG. In this alignment rotation position, the protruding portion 162 of the holding member 106 is aligned with the receiving recess 170 formed in the rear portion 116 of the tube member main body 102 in the direction of the longitudinal axis L. Next, the holding member 106 is displaced rearward from the holding position in FIG. 7 in the direction of the longitudinal axis L to obtain the release position in FIG. The holding member 106 is separated from the tubular window member 104 in the release position, and the holding of the holding member 106 with respect to the tubular window member 104 is released. In the alignment rotation position, the holding member 106 is released by the projection 162 of the holding member 106 being received in the receiving recess 170 of the tube member main body 102 in the process of displacing the holding member 106 from the holding position to the release position. It can be displaced to a position. On the other hand, when the holding member 106 is displaced rearward from the holding position toward the release position in a state where the holding member 106 is not in the alignment rotation position, the projecting portion 162 of the holding member 106 interferes with the rear portion 116 of the tube member main body 102. Therefore, the holding member 106 cannot be displaced to the release position. Next, the tubular window member 104 is pulled rearward from the assembly position of FIG. 8 in which the tubular member body 102 is assembled, and is pulled out from the front portion 114 of the tube member body 102 to obtain the communication release position of FIG. In this communication release position, the sealing engagement between the tubular window member 104 and the front portion 114 of the tube member main body 102 is released, and the communication between the first passage 124 and the second passage 136 is also released. By pulling out the tubular window member 104 in the communication release position through the first side opening 130 (FIGS. 1 to 3) of the tube member body 102, the tubular window member 104 is attached to the blade member 108. At the same time, it is removed from the tube member main body 102 (FIG. 10). Thus, in the said pipe member 100, when removing the tubular window member 104, it is not necessary to remove the pipe member main body 102 from a fluid piping member.

  When attaching the removed tubular window member 104, the above-described removal procedure is reversed. The tubular window member 104 can be inserted and incorporated into the tube member body 102 through either the first side opening 130 or the second side opening 132. As can be clearly understood from FIG. 2, a guide surface 172 extending in the direction of the longitudinal axis L is formed on the support column 128 serving as a side edge of the first and second side openings 130 and 132 of the tube member main body 102. Further, the tubular window member 104 is formed with a guide portion 174 protruding from the outer peripheral surface 104b. When the tubular window member 104 is inserted into the tube member main body 102 through one of the first and second side openings 130 and 132, the guide portion 174 of the tubular window member 104 abuts on the guide surface 172 of the tube member main body 102. The tubular window members 104 are aligned with the tube member main body 102 in the direction of the longitudinal axis L, and are coaxial with each other. The guide surface 172 and the guide portion 174 prevent the tubular window member 104 from coming out of the side openings 130 and 132 on the side opposite to the side openings 130 and 132 that are passed through when inserted. In addition, alignment between the tubular window member 104 and the tube member main body 102 is facilitated. Further, when the tubular window member 104 is displaced from the communication release position of FIG. 9 to the assembled position of FIG. 8, the guide portion 174 slides on the guide surface 172, and the tubular window member 104 is guided to an appropriate position. It also comes to be.

  In the tube member 100, in a state where the tubular window member 104 is removed from the tube member main body 102 (FIG. 10), the holding member 106 is displaced forward (to the right in the drawing) as shown in FIG. The tube member main body 102 can be pulled out from the rear portion 116 and further removed from the tube member main body 102 through the side openings 130 and 132 (FIG. 12).

  A blade member 108 is attached to the inside of the tubular window member 104 when it is removed from the tube member main body 102. As shown in FIG. 13, a first locking portion 178 that protrudes radially outward is formed at the rear end portion 176 of the rotation shaft 142 of the tubular window member 104. Further, the rear end 176 where the first locking portion 178 of the rotating shaft 142 is formed is divided into two by the slit 180, and has flexibility in the radial direction. The shaft holding portion 144 of the blade member 108 is formed with a second locking portion 182 that protrudes radially inward from the inner peripheral surface 144b. As described above, the blade member 108 can rotate around the rotation center axis C with respect to the tubular window member 104 by holding the rotation shaft 142 by the shaft holding portion 144, but at the same time with respect to the rotation shaft 142. Thus, it can be displaced along the rotation center axis C. As shown in FIG. 13, the blade member 108 is moved from the first position where the front end portion 184 contacts the shaft support portion 140 of the tubular window member 104 as shown in FIG. The second position where the portion 182 engages can be freely displaced with little resistance. That is, the blade member 108 is displaced up to the second position without applying any particular force, but beyond that, the blade member 108 is not displaced by the force of the own weight of the blade member 108, so that it naturally disengages from the tubular window member 104. It is prevented from falling. The blade member 108 is in a state where the rear end 154 protrudes from the rear end surface 104 a of the tubular window member 104 at the second position. When the projecting rear end 154 of the blade member 108 in the second position is pinched and pulled further rearward, the first locking portion 178 of the rotating shaft 142 is moved in the radial direction by the second locking portion 182 of the shaft holding portion 144. The rear end portion 176 divided into two parts of the rotating shaft 142 is pushed inwardly and thereby bent inward in the radial direction, and the engagement between the first locking portion 178 and the second locking portion 182 is released. That is, the first locking portion 178 and the second locking portion 182 constitute a snap fit, and the snap fit is released by pulling the blade member 108 with a force of a certain level or more, so that the blade member 108 is moved from the second position. Further, it can be displaced backward. The wing member 108 can be easily removed from the tubular window member 104 as shown in FIG. 14 by simply pulling and thus moving backward beyond the second position. By removing the blade member 108 in this manner, the inner peripheral surface 104c of the tubular window member 104 can be easily cleaned. When attaching the blade member 108 to the tubular window member 104, the blade member 108 is pushed into the tubular window member 104 so that the rotating shaft 142 is inserted into the shaft holding portion 144, and the second member of the blade member 108 is engaged. The first locking portion 178 of the rotating shaft 142 is bent radially inward by the locking portion 182 so that the second locking portion 182 gets over the first locking portion 178. Thus, the blade member 108 can be easily attached.

  When the tubular window member 104 is attached to and detached from the tube member main body 102, the holding member 106 is in the release position as shown in FIGS. In this release position, the blade support portion 152 of the holding member 106 has a direction toward the first side opening 130 and the second side opening 132 (left and right as viewed in the figure), as shown in FIG. It is formed to become. As described above, in the assembled state, the blade member 108 is supported by the blade support portion 152 and held at the first position. However, if the blade member 108 is not supported by the blade support portion 152, it is freely displaced up to the second position. If the blade member 108 is displaced from the first position toward the second position in the process of attaching or removing the tubular window member 104, the rear end 154 of the blade member 108 may be caught by the holding member 106. . In the tube member 100, the blade support 152 is attached to and removed from the first and second side openings 130, 132 in the direction toward the first and second side openings 130, 132, that is, the tubular window member 104. The blade member 108 continues to be supported by the blade support portion 152 in the process of attachment and removal because it extends in the direction along the moving direction of the tubular window member 104 when performing the operation. Thereby, the blade member 108 is prevented from being displaced to the second position side and being caught inside the holding member 106.

  As shown in FIG. 16, a pipe member 200 according to the second embodiment of the present invention is mainly different from the pipe member 100 according to the first embodiment in a blade member 208 and a structure for holding the blade member 208. In the flow viewing member 210 of the pipe member 200, the tubular window member 204 is provided with a shaft holding portion 244 fixed to the peripheral wall portion 234, and the main body portion 242 of the blade member 208 constitutes the rotation shaft 242. Yes. The shaft holding portion 244 of the tubular window member 204 has a first locking portion 278 protruding radially inward on the inner peripheral surface 244b. The rotating shaft (main body portion) 242 of the blade member 208 has a second locking portion 282 that protrudes radially outward at the front end portion 284. In the illustrated assembled state, the step portion 288 of the front end portion 284 of the rotating shaft 242 abuts or approaches the rear end surface 290 of the shaft holding portion 244, and the rear end surface 292 of the rotating shaft 242 is the blade support portion of the holding member 206. Supported by 252. As a result, the blade member 208 is held in the direction of the rotation center axis C. The rear end surface 292 of the rotation shaft 242 has a conical shape, and the blade support portion 252 is formed with a conical recess 294 that matches the conical rear end surface 292 of the rotation shaft 242. The radial position of the rear end surface 292 of 242 is fixed so that the rotation center axis C does not shake. In a state where the tubular window member 204 is removed from the tube member main body 202, the second locking portion 282 of the blade member 208 comes into contact with the first locking portion 278 of the shaft holding portion 244 from the first position in FIG. It can be freely displaced up to the second position. By pinching and pulling the portion of the blade member 208 protruding from the rear end surface 204a of the tubular window member 204 in the second position, the snap fit by the first locking portion 278 and the second locking portion 282 is released, and the blade Member 208 can be removed from tubular window member 204. In the present embodiment, since the tubular window member 204 does not have a rotation shaft, the interior of the tubular window member 204 after the blade member 208 is removed becomes wide and the inner peripheral surface 204c of the tubular window member 204 is washed. It becomes easier.

  As shown in FIG. 17, the pipe member 300 according to the third embodiment of the present invention includes a C-shaped lock member 396 that is detachably attached to the outer peripheral surface 302 a of the pipe member main body 302. By attaching the lock member 396 to the tube member main body 302 with the holding member 306 in the holding position, the protruding portion 362 of the holding member 306 interferes with the lock member 396 and the holding member 306 is displaced backward from the holding position. Can not do. That is, in the state where the lock member 396 is attached, the holding member 306 cannot be displaced to the release position, and therefore, the communication of the flow path is prevented from being erroneously released. When such a lock member 396 is used, the holding member 306 does not need to be rotatable in the circumferential direction.

  Although the pipe member 400 which concerns on the 4th Embodiment of this invention has the structure close | similar to the pipe member 200 which concerns on 2nd Embodiment especially, as shown to FIGS. 18-24, the shape of each member differs, respectively. Yes.

  As shown in FIGS. 19 and 20, a flat holding surface 404 d is formed on the outer peripheral surface 404 b of the tubular window member 404, and when this holding surface 404 d is assembled into the tube member main body 402, the holding surface 404 d becomes the pipe member main body 402. The column portion 428 (FIG. 18) is held in surface contact. Further, the guide portion 474 protruding from the outer peripheral surface 404b of the peripheral wall portion 434 has a plate shape extending on the outer peripheral surface 404b in the direction of the longitudinal axis L, and comes into contact with the guide surface 472 of the tube member main body 402 with a wider surface. It is like that. With such a structure, the tubular window member 404 can be attached to the tube member main body 402 in a more stable state.

  As can be seen from FIGS. 20 and 21, the tubular window member 404 has a shaft holding portion 444 that extends from the peripheral wall portion 434 to the center of the second passage 436. Unlike the shaft holding portion 244 of the second embodiment shown in FIG. 16, the shaft holding portion 444 has a cantilever structure. By adopting such a cantilever structure, cleaning of the inner peripheral surface 404c of the tubular window member 404 becomes easier, and the resistance of the fluid flowing through the flow path 412 becomes smaller.

  Further, as shown in FIG. 22, the tubular window member 404 has a window outer peripheral surface 405a exposed to the outside when incorporated in the tube member main body 402, and a second passage 436 positioned on the radially inner side of the window outer peripheral surface 405a. And the blade member 408 disposed in the second passage 436 is visible through the window outer peripheral surface 405a and the window inner peripheral surface 405b. As shown in FIG. 22, the window inner peripheral surface 405b is a part of the inner peripheral surface 404c having a circular cross section. In the tubular window member 404 in the present embodiment, the window outer peripheral surface 405a having a circular arc cross section has a center of curvature P1 located between the center of curvature P2 of the window inner peripheral surface 405b and the window outer peripheral surface 405a. Is shaped. Therefore, the wall thickness in the radial direction of the peripheral wall portion 434 is the thickest at the central portion of the window outer peripheral surface 405a and gradually becomes thinner toward the end. In FIG. 22, a virtual circle V passing through the arc of the window outer peripheral surface 405a is indicated by a broken line. Such a window outer peripheral surface 405a and a window inner peripheral surface 405b constitute a lens, and the blade member 408 in the second passage 436 appears to be enlarged compared to that of the above embodiment when viewed from the outside. It becomes like this. Thereby, the visibility of the blade member 408 is improved. Note that the window outer peripheral surface 405a and the window inner peripheral surface 405b do not necessarily have a circular or arc cross section, and may be non-arc-shaped surfaces.

  The blade member 408 includes a main body portion 442 that constitutes a rotation shaft that is rotatably held by the shaft holding portion 444 of the tubular window member 404, and a first blade 446a that is disposed on the outer peripheral surface 442a of the main body portion 442. And the second blade 446b, and a first fluid resistance portion 447a and a second fluid resistance portion 447b disposed on the outer peripheral surface 442a between the first and second blades 446a and 446b. The rotating shaft (main body portion) 442 of the blade member 408 has a step portion 488 facing the front end portion 484 rearward. In the assembled state of FIG. 21, the step portion 488 of the rotating shaft 442 is in contact with or close to the engaging portion 478 of the shaft holding portion 444, and the rear end surface 492 of the rotating shaft 442 is supported by the blade support portion 452 of the holding member 406. By being supported, the position in the direction of the rotation center axis C is maintained. In a state where the tubular window member 404 is detached from the tube member main body 402, the blade member 408 can be detached from the tubular window member 404 by pinching and pulling the rear end surface 492 side of the rotation shaft 442. Alternatively, the blade member 408 is removed from the tubular window member 404 by pushing the front end 484 of the rotating shaft 442 protruding forward from the shaft holding portion 444 of the tubular window member 404 with a hand or a thin rod-shaped member. You can also

  As shown in FIG. 24, the first and second fluid resistance portions 447a and 447b of the blade member 408 are opposite to each other from the outer peripheral surface 442a of the main body portion 442 along one plane F including the rotation center axis C ( 24. Each plate protrudes upward and downward as viewed in FIG. 24 and extends in the direction of the rotation center axis C (left and right as viewed in FIG. 23) along the one plane F as shown in FIG. ing. The first and second blades 446a and 446b are located on the opposite sides of the one plane F, and are substantially perpendicular to the one plane F from the outer peripheral surface 442a of the main body 442 (in FIG. 24). It is formed so as to protrude in the horizontal direction as viewed. The first blade 446a has a flat plate shape that linearly extends obliquely with respect to the rotation center axis C when the one plane F is viewed in the vertical direction (that is, viewed in the direction of FIG. 23). As a result, a surface inclined with respect to the rotation center axis C is formed on the first blade 446a, and when the fluid flows in the direction of the longitudinal axis L (that is, the direction of the rotation center axis C), the blade A force in the rotation direction is generated in the member 408 by the fluid. The second blade 446b also has the same shape as the first blade 446a. The blade member 408 rotates around the rotation center axis C by the force in the rotation direction that the first and second blades 446a and 446b receive from the fluid when the fluid flows in the flow path 412. On the other hand, since the first and second fluid resistance portions 447a and 447b extend in the direction of the rotation center axis C as described above and do not constitute a surface inclined with respect to the rotation center axis C, the blade member 408 is stationary. In this state, no force in the rotational direction due to the fluid acts on the first and second fluid resistance portions 447a and 447b. However, when the blade member 408 is rotating, the first and second fluid resistance portions 447a and 447b receive a resistance force in a direction opposite to the rotation direction from the fluid. Accordingly, the first and second fluid resistance portions 447a and 447b cancel out part of the force in the rotational direction that the first and second blades 446a and 446b receive from the fluid, so that the blade member 408 is entirely removed from the fluid. It functions to reduce the resultant force in the rotational direction to be received and to suppress an increase in the rotational speed of the blade member 408. Since the fluid resistance is proportional to the square of the relative speed between the object and the fluid, the first and second fluid resistance portions 447a and 447b increase as the flow velocity of the flowing fluid increases and the rotation speed of the blade member 408 increases. The resistance force received from the fluid increases. That is, the effect of the rotational speed suppression by the first and second fluid resistance portions 447a and 447b increases as the rotational speed of the blade member 408 increases. The shapes of the first and second fluid resistance portions 447a and 447b are not necessarily flat, and may be a shape such as a cylinder or a prism that extends radially outward. A plurality may be arranged in the direction of the rotation center axis C. Further, the fluid resistance portion may be provided only on one side of the rotating shaft 442.

  The blade member 408 is a two-color molded member formed by resin molding using a red first resin material and a yellow second resin material. A mold (not shown) for forming the blade member 408 is constituted by two molds that are divided by one plane F shown in FIG. That is, the molded blade member 408 is pulled out of the mold in a direction perpendicular to the one plane F. Here, in the blade member 408, in particular, the first and second blades 446a and 446b and the first and second fluid resistance portions 447a and 447b are not caught in the mold removal direction (left and right direction as viewed in FIG. 24). Due to the shape, it is possible to easily release from the mold. The blade member 408 is formed by injecting a first resin material from a mold corresponding to the first blade 446a and injecting a second resin material from a mold corresponding to the second blade 446b. Accordingly, the molded blade member 408 is formed of the first resin material having a red color on the left side and the second resin material having a yellow color on the right side as viewed in FIG. That is, the blade member 408 is a two-color member in which half is red and the other half is yellow. Thus, since the blade member 408 has two different colors, the rotation of the blade member 408 can be easily visually recognized by the change of the color. In the present embodiment, the two colors are red and yellow, but it is naturally possible to combine other colors. In addition, as described above, the mold for performing such two-color molding can be a mold that is divided by one plane F, and the mold can be easily divided. Mold production is relatively easy.

  As described above, the first and second fluid resistance portions 447a and 447b of the blade member 408 are provided mainly for suppressing an increase in the rotational speed of the blade member 408. However, the tubular window to which the blade member 408 is attached is provided. At the same time, it plays a role of maintaining the posture of the blade member 408 when the member 404 is incorporated into the tube member main body 402. That is, in a state where the tubular window member 404 is removed, the rotating shaft 442 of the blade member 408 is cantilevered by the shaft holding portion 444 of the tubular window member 404, so that the blade member 408 is attached to the tubular window member 404. However, since the first and second fluid resistance portions 447a and 447b are disposed between the first and second blades 446a and 446b, these portions are disposed inside the tubular window member 404. By engaging with the peripheral surface 404c, the inclination of the blade member 408 is suppressed. In particular, since the blade member 408 in the present embodiment is a two-color molded member as described above, the first and second blades 446a and 446b extend only to the left and right as viewed in FIG. 24 and extend upward and downward. Since the first and second fluid resistance portions 447a and 447b are not provided, the blade member 408 is greatly inclined upward and downward. When the blade member 408 is greatly inclined as described above, the rear end surface 492 of the rotation shaft 442 is fitted into the recess 494 (FIG. 21) of the blade support portion 452 when the tubular window member 404 is assembled into the tube member main body 402. It will disappear. On the other hand, as described above, the first and second fluid resistance portions 447a and 447b make the inclination of the blade member 408 with respect to the tubular window member 404 fall within a predetermined range, so that the rotation shaft of the blade member 408 is rotated. The rear end surface 492 of 442 is appropriately fitted and held in the conical recess 494 of the holding member 406. That is, by restraining the inclination of the blade member 408 by the first and second fluid resistance portions 447a and 447b, it is possible to easily perform the attaching operation of the tubular window member 404 with the blade member 408 attached.

  In the holding member 406 in the present embodiment, the surface of the protruding portion 462 facing the tubular window member 404 is a sliding engagement surface 462a that slides with the rear end surface 404a of the tubular window member 404. A flexible portion 463 that is flexible in the direction of the longitudinal axis L is provided on the sliding engagement surface 462a. A locking protrusion 466 is formed on the flexible portion 463. The locking projection 466 is received in a locking recess 498 formed in the rear end surface 404a of the tubular window member 404 in the assembled state so that the position of the holding member 406 in the rotation direction with respect to the tubular window member 404 is held. To. As shown in FIG. 18, when the locking projection 466 is in the locking rotation position where the locking projection 466 is locked to the locking recess 498 as shown in FIG. Rotation in the direction is suppressed. When the holding member 406 is rotated from the locking rotation position with respect to the tube member main body 402 and the tubular window member 404, the locking projection 466 is detached from the locking recess 498, and the periphery of the rear end surface 404 a of the tubular window member 404. It moves in the peripheral recess 499 formed in the. The locking projection 466 does not contact the tubular window member 404 when positioned in the peripheral recess 499. In addition, an inclined surface 462b is formed on the rear surface of the protruding portion 462, and the protruding portion 462 receives the tube member main body 402 when the holding member 406 is rotated from the alignment rotation position to the locking rotation position. It is made difficult to catch on the corner of the recess 470.

  As shown in FIG. 25, the pipe member 500 according to the fifth embodiment of the present invention is different from the pipe member 400 according to the fourth embodiment in the holding form of the blade member 508. Specifically, the front end surface 591 and the rear end surface 592 of the rotating shaft 542 of the blade member 508 are each tapered, the shaft holding portion 544 of the tubular window member 504 is cap-shaped, and the blade of the holding member 506 is further formed. A conical recess 594 is formed in the support portion 552. The taper angle of the front end surface 591 of the blade member 508 is more acute than the taper angle of the shaft holding portion 544 of the tubular window member 504, and the taper angle of the rear end surface 592 of the blade member 508 is also conical. The taper angle of the recess 594 is an acute angle. Accordingly, the front end surface 591 and the rear end surface 592 of the blade member 508 come to contact the shaft holding portion 544 and the conical concave portion 594 basically at their tip portions. Thereby, the contact area between the rotating shaft 542 of the blade member 508, the shaft holding portion 544 and the blade support portion 552 is reduced, and the frictional resistance during rotation is reduced.

  A pipe member 600 according to the sixth embodiment of the present invention has a configuration similar to that of the pipe members 400 and 500 according to the fourth and fifth embodiments, as shown in FIGS. The members 400 and 500 are different in the following points.

  In the tubular window member 604 in the tube member 600, a grip portion 675 is formed between the window outer peripheral surface 605 a and the guide portion 674. In the fourth embodiment, when the tubular window member 404 is taken out from the tube member main body 402, the tubular window member 404 is pushed out from the rear side. However, when the tube member 400 is attached to a narrow place, etc. The finger may not turn to the rear side of the tubular window member 404. On the other hand, the tubular window member 604 of the tube member 600 is formed with the grip portion 675 as described above. Even in such a situation, the tubular window member 604 is pulled by gripping the grip portion 675. The tubular window member 604 can be easily removed from the tube member main body 602.

  As shown in FIG. 28, the locking protrusion 666 of the holding member 606 has a triangular shape. Further, the protrusion 662 of the holding member 606 extends further outward in the radial direction so that the holding member 606 can be easily operated.

  As shown in FIG. 29, the first and second fluid resistance portions 647a and 647b of the blade member 608 are longer in the direction of the longitudinal axis L and have a shape closer to a rectangle. Thereby, the areas of the first and second fluid resistance parts 647a and 647b are increased. Similarly, the areas of the first and second blades 646a and 646b are large. Thereby, the visibility during rotation of the blade member 608 when viewed from the outside of the tubular window member 604 can be improved. Further, the resistance received from the fluid flowing through the flow path 612 is increased, and the blade member 608 can be rotated even with a smaller flow rate. A groove 693 is formed near the rear end surface 692 of the blade member 608. When the blade member 608 is removed from the tubular window member 604, the blade member 608 can be removed more easily by hooking a finger into the groove 693. The structure of the shaft holding portion 644 of the tubular window member 604 for holding the rotating shaft 642 of the blade member 608 is similar to that of the tube member 500 according to the fifth embodiment shown in FIG. The difference is that the support end surface 645 of the portion 644 is a plane substantially perpendicular to the longitudinal axis L. Thus, the tapered front end surface 691 of the blade member 608 always comes into point contact with the support end surface 645, and the friction between the front end surface 691 and the support end surface 645 when the blade member 608 rotates. The resistance is not increased.

  As shown in FIG. 30, the left window outer peripheral surface 605a in the figure of the tubular window member 604 is composed of an arc-shaped portion 605a-1 and a linear portion 605a-2 extending straight from there to the holding surface 604d. Thus, there is no depression from the window outer peripheral surface 605a to the holding surface 604d. Accordingly, when the tubular window member 604 is attached to the tube member main body 602, the tubular window member 604 is smoothly inserted into the tube member main body 602 without being caught by the column portion 628 of the tube member main body 602.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, the tubular window member does not need to be entirely made of a transparent material, and only a part of the tubular window member is made of a transparent material if the blade member in the flow path can be visually recognized when incorporated in the tube member body. The transparent material may be colored or frosted glass that is not completely transparent as long as the blade member is visible. Further, as a flow display member for displaying the flow of fluid in the flow path, other members such as a fluid resistor that is displaced by the fluid and is displaced in the flow direction may be used instead of the blade member. In addition, when the target fluid contains visible solids or bubbles, the presence or absence of the fluid flow can be confirmed by observing them. It is not necessary to provide a display member. Moreover, in the said embodiment, although the presence or absence of the flow of the fluid is confirmed by rotation of a blade member, it is also possible to set it as the flow sensor which measures the flow volume of the fluid from the rotational speed of a blade member. Furthermore, as a configuration for preventing the holding member from being accidentally displaced from the holding position to the release position, a screw is passed through the locking extension portion of the holding member, and the screw is fixed to the tube member body. Also good. At this time, the holding member may be fixed with a screw after being set to the locking rotation position, or may be fixed with a screw at the alignment rotation position.

  The configurations in the embodiments can be freely combined with each other. For example, the blades of the blade member in the first to third embodiments may be shaped like the first and second blades of the blade member in the fourth to sixth embodiments. Furthermore, in the first to third embodiments, the blade member may be a two-color molded member, or may have first and second fluid resistance portions. Alternatively, the structure for suppressing the rotation of the holding member in the first and second embodiments is similar to the locking protrusion of the holding member and the locking recess of the tubular window member as in the fourth to sixth embodiments. A structure may be adopted, and conversely, the configurations of the first and second embodiments may be employed in the fourth to sixth embodiments. Similarly, other components in each embodiment can be freely combined with each other.

Tube member main body 102; outer peripheral surface 102a; tubular window member 104; rear end surface 104a; outer peripheral surface 104b; inner peripheral surface 104c; holding member 106; blade member 108; Portion 114; inner circumferential surface 114a; rear portion 116; inner circumferential surface 116a; intermediate portion 118; front opening 120; rear opening 122; first passage 124; female screw portion 126; strut portion 128; The second side opening 132; the peripheral wall portion 134 (of the tubular window member 104); the second passage 136; the front end portion 138; the shaft support portion 140; the rotating shaft 142; the shaft holding portion (main body portion) 144; The inner peripheral surface 144b; the blade 146; the peripheral wall portion 148 (of the holding member 106); the front end surface 148a; the outer peripheral surface 148b; the third passage 150; the blade support portion 152; Rear end 154; rear end 156 (of the holding member 106); front end 158 (of the holding member 106); rear end 160 (of the tubular window member 104); projecting portion 162; locking extension 164; Hole 166; ball 168; receiving recess 170; guide surface 172; guide portion 174; rear end portion 176 (of rotating shaft 142); first locking portion 178; slit 180; second locking portion 182; Front end 184;
Tube member 200; tube member main body 202; tubular window member 204; rear end surface 204a; inner peripheral surface 204c; holding member 206; blade member 208; flow visualizing member 210; peripheral wall portion 234; Holding portion 244; inner peripheral surface 244b; blade support portion 252; first locking portion 278; second locking portion 282; front end portion 284; step portion 288; rear end surface 290 (of shaft holding portion 244); 242) rear end face 292; conical recess 294;
Tube member 300; tube member main body 302; outer peripheral surface 302a; holding member 306; projection 362; lock member 396;
Tube member 400; Tube member body 402; Tubular window member 404; Rear end surface 404a; Outer peripheral surface 404b; Inner peripheral surface 404c; Flow path 412; support column 428; peripheral wall 434; second passage 436; front end 438; rotating shaft (main body) 442; outer peripheral surface 442a; shaft holder 444; first blade 446a; Fluid resistance portion 447a; second fluid resistance portion 447b; blade support portion 452; rear end portion 460; projecting portion 462; sliding engagement surface 462a; inclined surface 462b; flexible portion 463; Guide surface 472; Guide portion 474; Locking portion 478; Front end portion 484; Step portion 488; Rear end surface 492; Recessed portion 494; Locking recess portion 498;
Tubular member 500; tubular window member 504; holding member 506; blade member 508; rotating shaft 542; shaft holding portion 544; blade support portion 552; front end surface 591; rear end surface 592;
Tubing member 600; Tubing member main body 602; Tubular window member 604; Holding surface 604d; Window outer peripheral surface 605a; Arc-shaped portion 605a-1; Linear portion 605a-2; Holding member 606; Portion 628; rotating shaft 642; shaft holding portion 644; support end surface 645; first blade 646a; second blade 646b; first fluid resistance portion 647a; second fluid resistance portion 647b; Guide portion 674; gripping portion 675; front end surface 691; rear end surface 692; groove 693;
Longitudinal axis L; rotation center axis C; curvature center P1; curvature center P2; virtual circle V; one plane F;

Claims (14)

A pipe member that is incorporated between fluid piping members and constitutes a part of the fluid piping,
A tube member body defining a first passage, the tube member body having a side opening that communicates with the first passage from the side with respect to the longitudinal axis of the first passage;
A tubular window member incorporated into the tube member main body through the side opening, and a second passage that communicates with the first passage and constitutes a flow path of the tube member when incorporated into the tube member main body. And a tubular window member that is at least partly made of a transparent material and is visible through the at least part.
A holding member attached to the tube member body, the holding member engaging with the tubular window member to hold the tubular window member in a position incorporated in the tube member body; and apart from the tubular window member A holding member disengaged between a release position in which the holding to the tubular window member is released and the tubular window member is removable from the tubular member body through the side opening;
A pipe member comprising: The holding member is attached to the tube member body slidably in the direction of the longitudinal axis between the holding position and the release position;
When the tubular window member is in a state where the holding member is in the release position, the tubular window member is displaced in the direction of the longitudinal axis from the incorporation position where the tubular member body is incorporated in the tube member main body, and the first passage and It is possible to displace between the communication release position where the communication with the second passage is released,
The tubular member according to claim 1, wherein the tubular window member is configured to be removable from the tubular member body through the side opening at the communication release position. The tube member body has a cylindrical front portion and a rear portion, and an intermediate portion between the front portion and the rear portion, and the side opening is formed in the intermediate portion,
The tubular window member is adapted to sealingly engage the front portion in alignment with the tube member body in the longitudinal axis in the installed position;
The holding member is a cylindrical member having a third passage, and in the holding position, the tubular window member and the rear portion are sealingly engaged, and the third passage is the first passage and the second passage. The pipe member according to claim 2, wherein the pipe member constitutes the flow path of the pipe member together with the passage.   The tube member according to claim 2 or 3, wherein the holding member is removable from the tube member body through the side opening in a state where the tubular window member is detached from the tube member body. The holding member has a protruding portion protruding radially outward from the outer peripheral surface of the holding member, and the tube member main body has a receiving recess for receiving the protruding portion;
The holding member is rotatable about the longitudinal axis with respect to the tube member body when in the holding position, and the protrusion is aligned with the receiving recess in the direction of the longitudinal axis. When in the rotation position, the protrusion is displaceable to the release position while being received in the receiving recess, and when not in the alignment rotation position, the protrusion interferes with the tube member main body to cause the release position. The pipe member according to any one of claims 2 to 4, wherein the pipe member is configured so as not to be displaceable.   The projecting portion has a locking extension extending along the outer peripheral surface of the tube member main body, and includes an outer peripheral surface of the tube member main body and an inner surface of the locking outer extension facing the outer peripheral surface. A locking projection is provided on one of the sides, and a locking recess is provided on the other side. When the holding member is rotated from the alignment rotation position to the locking rotation position at the holding position, The tube member according to claim 5, wherein the protrusion and the locking recess engage with each other to suppress rotation of the holding member. The protrusion has a locking projection on a sliding engagement surface that is slidably engaged with the tubular window member,
The tubular window member has a locking recess for receiving the locking projection;
When the holding member is rotated from the alignment rotation position to the locking rotation position at the holding position, the locking projection and the locking recess are engaged to suppress the rotation of the holding member. The pipe member according to claim 5, which is configured as described above.   8. A flexible portion having flexibility in the direction of the longitudinal axis is provided on the sliding engagement surface of the holding member, and the locking projection is provided on the flexible portion. The pipe member as described in 2. The tube member body has a guide surface formed at a side edge of the side opening and extending in the direction of the longitudinal axis, and the tubular window member protrudes radially outward from the outer peripheral surface of the tubular window member. Has a guide,
When the tubular window member is inserted into the first passage from the side opening and is set to the communication release position, the guide portion comes into contact with the guide surface and the tubular window member is in contact with the tube member main body. The guide portion is adapted to slide on the guide surface when the tubular window member is displaced from the communication release position to the installation position, and is aligned in the direction of the longitudinal axis. The pipe member according to any one of 2 to 8.   The pipe member according to any one of claims 1 to 9, further comprising a flow display member disposed in the second passage of the tubular window member and displaced by a fluid flowing in the flow path.   The flow indicator member is a vane member rotatably attached to the tubular window member in a circumferential direction with respect to the longitudinal axis, and is removed from the tube member body together with the tubular window member. The tube member as described.   The tubular window member has a window outer peripheral surface exposed to the outside when incorporated into the tube member main body, and a window inner peripheral surface positioned radially inward of the window outer peripheral surface, and the second passage The inside is visible through the window outer peripheral surface and the window inner peripheral surface, and the window outer peripheral surface has a center of curvature of the window outer peripheral surface between the center of curvature of the window inner peripheral surface and the window outer peripheral surface. The pipe member according to any one of claims 1 to 11, wherein the pipe member is shaped so as to be in a position therebetween.   The pipe member according to claim 12, wherein the window outer peripheral surface and the window inner peripheral surface each have a circular cross section.   The side opening has first and second side openings formed at positions facing each other in the radial direction of the first passage, and the tubular window member is formed of the first and second side openings. The pipe member according to any one of claims 1 to 13, wherein the pipe member can be attached to the pipe member main body through any of them.

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