JP5112760B2 - Fitting pipe and cleaning method - Google Patents

Description

  The present invention relates to a joint pipe provided with a cylindrical part whose one end is connected to a pipe, a connection part whose tank is connected to the other end of the cylindrical part, and a cleaning method for cleaning the joint pipe and the pipe with a cleaning liquid. About.

  2. Description of the Related Art Conventionally, a liquid feeding device is known in which one end of a joint pipe is connected to a tank, the other end of the joint pipe is connected to a pipe, and liquid in the tank is sent from the pipe to the server through the joint pipe. In such a liquid feeding device, it is necessary to periodically clean the piping when supplying a liquid such as a beverage.

As a device with a mechanism for cleaning the piping, for example, a filling cylinder which can be filled from a storage tank through a filling line which can be closed and which can be discharged through a compounding line by means of a movable piston. The provided arrangement is disclosed. In this device, the filling device is configured to rotate around the axis of the filling cylinder together with the storage tank, and in the first rotational position where the storage tank takes the upper position, the filling line is opened, and the storage tank is The filling line is closed in the second rotational position, which is the lower position. And in the closed filling pipeline, it is comprised so that a compounding agent may not reach a filling cylinder (refer patent document 1).
JP-A-6-86963

  However, the apparatus described in Patent Document 1 has a problem that the configuration is complicated and the cost increases. In addition, when a cleaning sponge ball is introduced into a pipe for cleaning, it is necessary to remove the connecting part of the pipe and set the sponge ball, which is cumbersome and laborious. Further, there is a problem that the sponge balls are clogged when the sponge balls are passed through the filling cylinder.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a joint pipe and a cleaning method that can prevent the sponge member from being clogged and can efficiently wash the joint pipe and the pipe. .

In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a cylindrical part in which one end is connected to a pipe and a flow path is formed, and the other end of the cylindrical part is connected to a tank. A joint pipe provided with a connection part and an on-off valve provided between the connection part and the tubular part, and the connection part can be set with a sponge member that can be washed through the pipe A stepped portion is formed between the tubular portion and the connecting portion with an inner diameter of the tubular portion larger than an inner diameter of the connecting portion, and the on-off valve is formed of the stepped portion. A rubber plate fixed to the rubber plate, forming a slit that is cut in a circular shape leaving a part in the rubber plate, the circular portion serving as a valve body that closes the flow path, and the part as the valve body A support member that rotatably supports the end portion of the rubber plate toward the cylindrical portion side, and further, the support member has a thickness corresponding to the thickness of the rubber plate. Also thin, the thickness of the rubber plate and the valve body around the support member, and characterized in that thinner than the thickness of the other of the rubber plate and the valve body.

  According to invention of Claim 1, piping is connected to the end of a cylindrical part, and the tank is connected to the connection part provided in the other end of the cylindrical part. A sponge member that can be cleaned through a pipe can be set in the connecting portion. In addition, a step portion is formed between the tubular portion and the connecting portion with the inner diameter of the cylindrical portion larger than the inner diameter of the connecting portion, and a rubber plate constituting the on-off valve is fixed to the step portion. . The on-off valve forms a slit that is cut in a circular shape, leaving a part in the rubber plate, and the circular part is used as a valve body that closes the flow path, and the above part is used as the cylindrical part side. It is set as the support member supported so that rotation is possible. In the state where the liquid is not introduced from the tank, the on-off valve is arranged at a position along the step portion to close the flow path, and when the liquid is introduced from the tank to the connection portion, a part of the rubber plate The support member is extended, the valve body is rotated toward the cylindrical portion, and the flow path is opened. Further, by making the support member thinner than the thickness of the rubber plate, the valve body can easily turn to the cylindrical portion side when the fluid is introduced.

  In this joint pipe, the sponge member is set in the connection portion and the liquid is introduced, whereby the valve body rotates to the cylindrical portion side, and the sponge member passes through the valve body and is sent to the cylindrical portion. This suppresses the sponge member from clogging in the vicinity of the valve body of the joint pipe. Furthermore, the sponge member that has passed through the valve body is sent to the pipe from the other end of the cylindrical portion. For this reason, it becomes possible to wash | clean the inside of a cylindrical part and piping efficiently with a sponge member. In addition, the cost can be reduced without complicating the structure for opening and closing the valve body.

Further, since the thickness of the rubber plate and the valve body around the support member is thinner than the thickness of the other rubber plates and the valve body, the valve body is further rotated to the cylindrical portion side when the fluid is introduced. It becomes easy. For this reason, it is further suppressed that the sponge member is clogged in the vicinity of the valve body of the joint pipe.

The invention according to claim 2 is characterized in that, in the joint pipe according to claim 1 , a rigid member for preventing a back flow of liquid is attached to a central portion of the valve body.

In the second aspect of the invention, since the rigid member is attached to the central portion of the valve body, the valve body is held at a position where the flow path is closed along the stepped portion when the liquid is not introduced from the tank. By introducing the liquid from the tank, the valve body provided with the rigid member can be smoothly rotated toward the cylindrical portion. For this reason, the back flow of the liquid is prevented, and the fluid can flow in a certain direction.

The invention according to claim 3, comprising a coupling tube according to claim 1 or claim 2, a cleaning method of cleaning the pipe, after setting the sponge member to the connecting portion, the connecting portion Connected to the cleaning tank filled with the cleaning liquid, introduced the cleaning liquid from the cleaning tank to the cylindrical part through the connecting part to open the on-off valve, and the sponge member from the cylindrical part into the pipe It is characterized by sending to.

In the invention according to claim 3 , after setting the sponge member in the connecting portion provided at one end of the cylindrical portion, the cleaning tank filled with the cleaning liquid is connected to the connecting portion. And a washing | cleaning liquid is introduce | transduced into a cylindrical part through a connection part from a washing tank. By introducing the cleaning liquid, the valve body constituting the on-off valve is opened, and the sponge member passes through the valve body and is sent to the cylindrical portion, and further sent into the pipe. This makes it possible to efficiently clean the inside of the tubular portion and the piping with a small number of steps.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a sponge member is clogged by the valve body vicinity of a cylindrical part, and can wash | clean the inside of a joint pipe and piping efficiently with few processes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a joint pipe 10 according to a first embodiment of the present invention. The joint pipe 10 includes a cylindrical portion 12. A flow path 14 through which a liquid (for example, beer) can pass is formed on the inner peripheral side of the cylindrical portion 12. The inner peripheral side of the cylindrical portion 12 has a large diameter portion 12A on the upstream side in the fluid introduction direction (lower side in FIG. 1), and the diameter gradually increases from the large diameter portion 12A toward the downstream side in the fluid introduction direction. The taper part 12B which reduces is provided, and the small diameter part 12C which continues in the fluid introduction direction downstream from the taper part 12B. That is, the flow path 14 is comprised by the large diameter part 12A, the taper part 12B, and the small diameter part 12C.

  As shown in FIG. 3, a hose 62 (pipe) is connected via a joint 18 to one end of the cylindrical portion 12 that is downstream in the liquid introduction direction (upper side in FIG. 3). The hose 62 is connected to a server (not shown) for supplying beer, for example. Further, a cylindrical connecting portion 16 is provided at the other end of the cylindrical portion 12 which is the upstream side in the liquid introduction direction (lower side in FIG. 3), and this connecting portion 16 is connected to the cleaning tank 70. Has been.

  As shown in FIG. 1, the inner peripheral portion on the other end side (upstream side in the liquid introduction direction) of the cylindrical portion 12 has a larger diameter than the large diameter portion 12A, and a screw portion 12D is formed on the inner peripheral portion. Has been. Moreover, the outer peripheral part on the opposite side to the cleaning tank 70 of the connection part 16 has a large diameter, and a screw part 16A to be screwed with the screw part 12D is formed on the outer peripheral part. The connecting portion 16 is attached to the cylindrical portion 12 by screwing the screw portion 16 </ b> A of the connecting portion 16 into the screw portion 12 </ b> D of the cylindrical portion 12.

  An opening 16B through which a fluid flows is formed in the core of the connection portion 16, and the opening 16B can set a substantially cylindrical sponge member 30 (see FIG. 3) for cleaning the inside of the hose 62. It is formed in size. The inner diameter of the opening 16B is smaller than the inner diameter of the large-diameter portion 12A of the cylindrical portion 12, and a step portion 22 is formed at the end of the connection portion 16 opposite to the cleaning tank 70. An opening / closing valve 20 that can open and close the flow path 14 is disposed adjacent to the step portion 22 between the connection portion 16 and the cylindrical portion 12. The mounting structure of the on-off valve 20 will be described later.

  As shown in FIGS. 2A to 2B, the on-off valve 20 includes a circular rubber plate 24, and a support that is a part of a circle on the inner diameter side of the circumferential portion 24 </ b> A of the rubber plate 24. A slit S1 that is cut in a circular shape leaving the portion 25 is formed, and a circular portion inside the slit S1 is a valve body 26. Concave portions 27 are formed on both sides of the rubber plate 24 around the support portion 25 and the support portion 25, and the thickness around the support portion 25 and the support portion 25 is thinner than the thickness of the rubber plate 24 in other portions. Is formed. A corner portion 27A in the recess 27 is cut out in an R shape. A circular opening 26 </ b> B is formed at the center of the valve body 26. In the present embodiment, the angle θ1 of both ends in the circumferential direction of the slit S1 with respect to the center of the rubber plate 24 is set to about 40 °, and the angle θ2 of both ends in the circumferential direction of the concave portion 27 with respect to the center of the rubber plate 24 is It is set to about 60 °.

  As shown in FIG. 1, a rigid member 28 including support portions 28 </ b> A and 28 </ b> B supported on the upper surface and the lower surface of the valve body 26 is fitted in the opening 26 </ b> B of the valve body 26. The rigid member 28 is formed of a material (for example, resin) harder than the rubber material of the valve body 26 so that the circular portion of the valve body 26 is not deformed.

  Between the cylindrical portion 12 and the connecting portion 16, the stepped portion 22, the end surface 17 of the large-diameter portion 12 </ b> A, and the inner peripheral portion of the cylindrical portion 12 adjacent thereto are disposed downstream of the stepped portion 22 in the liquid introduction direction. A configured groove is formed, and a circumferential portion 24A of the rubber plate 24 is sandwiched between the grooves. Then, by adjusting the tightening amount of the threaded portion 16A of the connecting portion 16 to the threaded portion 12D of the tubular portion 12, the circumferential portion 24A of the rubber plate 24 is connected to the stepped portion 22 of the connecting portion 16 and the tubular portion 12. It is fixed between the end face 17.

  In a normal state, the opening / closing valve 20 has the valve body 26 and the rubber plate 24 on the same plane by the support portion 25, and the flow path 14 is closed by the valve body 26 contacting the stepped portion 22. On the other hand, as shown in FIG. 4, when the liquid is introduced, the rubber support portion 25 extends, and the valve body 26 rotates downstream in the liquid introduction direction, so that the flow path 14 is opened. ing. At that time, since the thickness of the support portion 25 and the concave portion 27 around the support portion 25 is thinner than the thickness of the rubber plate 24, the support portion 25 is easily stretched and even when fluid is introduced at a low fluid pressure. It becomes easy to turn to the valve body 26. In addition, since the rigid member 28 is provided in the central portion of the valve body 26, the valve body 26 is stably held at a position where the flow path 14 is closed, and the valve body 26 is moved to the cylindrical portion 12 side by introducing liquid. It is possible to rotate smoothly. Thereby, the back flow of the fluid can be suppressed.

  In addition, as a material which comprises the rubber plate 24 as the on-off valve 20, SBR, NBR, EPDM, silicone rubber, fluororubber, IIR (butyl rubber), natural rubber, etc. are used, for example. Further, the material of the rigid member 28 is preferably a material harder than the rubber plate 24 in order to prevent deformation of the circular portion of the rubber plate 24. For example, PBT (polybutylene terephthalate), polypropylene, polyacetal, or the like is used. .

  As shown in FIG. 3, the joint 18 includes a cap nut 42 at one end of a substantially L-shaped tubular joint body 40. The screw portion 42A of the cap nut 42 is screwed into a screw portion 12E formed at the other end of the cylindrical portion 12. An annular locking member 44 is disposed on the inner wall of the cap nut 42, and a protrusion 40 </ b> A provided at one end of the joint body 40 is locked to the locking member 44. An annular seal member 46 is disposed between the longitudinal end face of the protrusion 40A of the joint body 40 and the longitudinal end face of the tubular portion 12, and the cap nut 42 and the joint body 40 are sealed. Has been.

  Further, an O-ring 48 provided in a groove formed on the inner peripheral surface of the joint body 40, a ring member 52 disposed adjacent to the groove, and a hose 62 are fixed to the other end of the joint body 40. A lock claw 50 having a substantially V-shaped cross section is provided. Further, the release claw 50 expands the diameter of the lock claw 50 to release the lock claw 50 from getting into the hose 62, and the holding member prevents the release ring 54 from coming off from the joint body 40 on the inner peripheral side of the joint body 40. 56 are provided.

  When the hose 62 is inserted from the insertion port provided at the other end of the joint body 40, the outer peripheral surface of the hose 62 is inserted into the back side of the joint body 40 while sliding the lock claw 50, and the hose 62 is in a coupled state. In this coupled state, when a liquid flows into the hose 62 and an internal pressure is applied, the hose 62 receives a force in a direction in which the hose 62 comes out of the joint body 40, and the hose 62 and the lock claw 50 move slightly to the insertion port side. Bites into the outer peripheral surface of the hose 62. As a result, the gripping force of the lock claw 50 on the hose 62 is increased, and the joint 18 and the hose 62 are firmly connected.

  Next, as a function of the joint pipe 10 of the present invention, a method for cleaning the joint pipe 10 and the hose 62 connected to the joint pipe 10 via the joint 18 will be described.

  A connecting portion 16 provided at one end of the tubular portion 12 is connected to the joint pipe 10 to a beer barrel (not shown). When cleaning the hose 62 and the server, as shown in FIG. 3, the beer barrel (not shown) of the connecting portion 16 is removed, and the substantially cylindrical sponge member 30 is set in the connecting portion 16. For example, foaming polyurethane is used as the sponge member 30. Further, a cleaning tank 70 filled with water as a cleaning liquid is attached to the connecting portion 16. Then, as shown in FIG. 4, when a predetermined gas (for example, carbon dioxide gas) is introduced and water is introduced into the flow path 14 of the joint pipe 10 by the gas pressure, the valve body 26 of the on-off valve 20 is It rotates downstream in the introduction direction, and the flow path 14 is opened. At this time, as shown in FIGS. 4B and 4C, the sponge member 30 passes through the on-off valve 20 together with water by opening the valve body 26 and moves in the flow path 14. At this time, since the support portion 25 of the valve body 26 and the surrounding thickness are thinner than the thickness of the rubber plate 24, the support portion 25 is easily extended, and the valve body 26 is easily rotated downstream in the introduction direction. For this reason, it is possible to prevent the sponge member 30 from being clogged in the vicinity of the valve body 26.

  As shown in FIG. 5, the sponge member 30 that has passed through the valve body 26 moves in the flow path 14 of the cylindrical portion 12. At this time, the inner diameter of the small-diameter portion 12C of the cylindrical portion 12 is set to be smaller than the outer diameter of the sponge member 30, and the sponge member 30 is compressed and moves while contacting the inner wall of the small-diameter portion 12C. The inside of 12C is cleaned. Further, as shown in FIG. 6, the sponge member 30 is sent from the joint pipe 10 through the joint 18 into the hose 62 along the water introduction direction. At this time, the inner diameter of the hose 62 is set to be smaller than the outer diameter of the sponge member 30, and the inside of the hose 62 is cleaned by the sponge member 30 moving while contacting the inner wall of the hose 62. Further, the sponge member 30 is sent to a server (not shown) on the downstream side of the hose 62, and the inside of the server is cleaned.

  In such a joint pipe 10, the beer barrel (not shown) connected to the connection portion 16 is removed, and then the sponge member 30 is set in the connection portion 16 and the cleaning tank 70 is attached. The hose 62 and the server (not shown) can be efficiently cleaned. When the fluid is not introduced into the joint pipe 10 (when the pressure is not applied in the direction in which the sponge member 30 is passed), the valve body 26 is closed by contacting the stepped portion 22, and the valve body 26 is closed. Can be prevented from leaking in the opposite direction (on the side of the connecting portion 16).

  Moreover, as shown in FIG. 7, as the rubber plate 90 constituting the on-off valve, the circumferential length of the slit S2 may be increased and the circumferential length of the support portion 92 may be shortened. Concave portions 93 are formed on both sides of the rubber plate 90 around the support portion 92 and its periphery. In the present embodiment, the angle θ1 of both ends in the circumferential direction of the slit S2 with respect to the center of the rubber plate 90 is set to about 25 °, and the angle θ2 of both ends in the circumferential direction of the recess 93 with respect to the center of the rubber plate 90 is It is set to about 50 °. In the on-off valve using the rubber plate 90, the support portion 92 is more easily extended when the fluid is introduced, and the valve body 26 is more easily rotated downstream in the introduction direction, as compared to the on-off valve shown in FIG. . For this reason, it can prevent more effectively that the sponge member 30 (refer FIG. 3) clogs in the valve body 26 vicinity.

  Next, a description will be given of the results of a cleaning test using a sponge member using the on-off valve of the present invention.

  In this cleaning test, normal piping (such as a hose 62) is connected to the beer server, and the sponge member 30 is actually introduced for cleaning. However, in normal cleaning, cleaning is performed by introducing the cleaning liquid in the cleaning tank 70 into the joint pipe 10 and the piping by carbon dioxide gas pressure. In this cleaning test, cleaning was performed using air instead of carbon dioxide. .

  As shown in FIG. 2, as the rubber plate 24 of the on-off valve, the thickness of the thin portion of the recess 27 is set to 0.6 mm, the angle θ1 of both ends of the slit S1 is 40 °, and both ends in the circumferential direction of the recess 27 Sample 1 was prepared by setting the angle θ2 of the part to 60 °. Further, as the rubber plate 24 of the on-off valve, the thickness of the thin portion of the recess 27 is set to 1.0 mm, the angle θ1 of the end of the slit S1 is 40 °, and the angle θ2 of the circumferential end of the recess 27 is 60. Sample 2 was set at 0 °. Further, as shown in FIG. 7, as the rubber plate 90 of the on-off valve, the thickness of the thin portion of the recess 93 is set to 0.6 mm, the angle θ1 of both ends of the slit S2 is 25 °, and the circumferential direction of the recess 27 Sample 3 was prepared by setting the angle θ2 of both ends of the plate to 50 °. The air pressure was set to 0.1 MPa, 0.15 MPa, or 0.2 MPa. It was confirmed whether the opening / closing valve at that time was clogged with the sponge member 30. The results are shown in Table 1.

  As shown in Table 1, in samples 1 to 3, the sponge member 30 passes when the air pressure is 0.15 MPa, and it is confirmed that the samples 1 and 3 pass the sponge member 30 in all samples. It was done. In Samples 1 to 3, it was confirmed that the sponge member 30 passed through all samples when the air pressure was 0.2 MPa. On the other hand, in samples 1 to 3, it was confirmed that the sponge member 30 was clogged when the air pressure was 0.1 MPa. On the other hand, as shown in FIG. 9, when a cleaning test is performed using an on-off valve in which the support portion 102 is formed to have the same thickness as the rubber plate 100, a sponge member is obtained when the air pressure is 0.15 MPa. 30 was confirmed to be clogged.

  Therefore, in the joint pipe 10 using the on-off valves of Samples 1 to 3, it was confirmed that the sponge member 30 can be prevented from being clogged even when the air pressure is low (about 0.15 MPa to about 0.2 MPa).

  Next, an experiment was conducted to examine whether or not a reverse flow occurs when pressure is applied to the joint pipe 10 in the direction opposite to the direction in which the sponge member 30 passes. In this experiment, an experiment was performed using a gas (pneumatic pressure) without using a liquid in order to perform a stricter evaluation. As shown in FIG. 9, in this experiment, an air pressure of about 0.01 MPa to about 0.7 MPa was applied for 1 minute in the direction opposite to the direction in which the sponge member 30 passes (in the direction of arrow A), and samples 1 to 3 were applied. The presence or absence of abnormalities such as reverse leakage (back flow) of the on-off valve was confirmed. The results are shown in Table 2.

  As shown in Table 2, in Samples 1 to 3, it was confirmed that no abnormality such as leakage occurred when an air pressure of 0.05 MPa to 0.65 MPa was applied. It was also confirmed that leakage occurred when a lower pressure of 0.01 MPa to 0.03 MPa was applied.

  Next, an experiment was conducted to examine pressure resistance by applying water pressure to the joint pipe 10. In this experiment, water pressure was applied up to 10 MPa, and the presence or absence of leakage (backflow) of the on-off valve was confirmed. The results are shown in Table 3.

  As shown in Table 3, it was confirmed that in Samples 1 to 3, when the pressure was increased to 10 MPa, the on-off valve was not damaged and abnormalities such as leakage did not occur.

  Next, an experiment was conducted to repeatedly pressurize the joint pipe 10 to confirm the presence or absence of an abnormality (air impulse test). In this experiment, as shown in FIG. 9, pressurization of 0 to 0.6 MPa was repeated 100,000 times in the opposite direction (arrow A direction) to the direction in which the sponge member 30 passes, and leakage of the on-off valve (reverse flow) ) Was confirmed. Further, after 100,000 pressurization tests, as shown in FIG. 10, the on-off valve 20 of the joint pipe 10 is submerged in a water tank 120 filled with water 122, and is zero in the reverse direction (arrow A direction). An experiment was conducted to check the presence or absence of leakage by applying an air pressure of 0.05 to 0.7 MP. The results are shown in Table 4.

  As shown in Table 4, in Samples 1 to 3, it was confirmed that no abnormality such as leakage occurred even when the pressurization was repeated 100,000 times. Furthermore, when the on-off valve of the joint pipe 10 was submerged and an air pressure of 0.05 to 0.7 MP was applied, all of the samples 1 to 3 had no abnormality such as leakage and had good airtightness. confirmed.

  In the above embodiment, the on-off valve 20 integrally forms the circumferential portion 24A, the support portion 25, and the valve body 26 by cutting the slit S1 portion using a single rubber plate 24. The present invention is not limited to this configuration, and the valve body and the support member that supports the valve body may be configured separately.

  In the on-off valve 20, the circumferential portion 24A of the rubber plate 24 and the valve body 26 have the same thickness, but the circumferential portion 24A and the valve body 26 may be set to different thicknesses.

It is sectional drawing which shows the coupling pipe which concerns on 1st Embodiment of this invention. It is the top view and sectional drawing which show the rubber plate which comprises the on-off valve provided in the joint pipe shown in FIG. It is sectional drawing which shows the state which set the sponge member to the connection part of the coupling pipe shown in FIG. 1, and connected the washing tank. It is sectional drawing which shows the process in which the sponge member shown in FIG. 3 moves within the cylindrical part of a joint pipe. It is sectional drawing which shows the process in which a sponge member moves the inside of a cylindrical part. It is sectional drawing which shows the process in which a sponge member moves in the hose. It is the top view and sectional drawing which show the modification of the rubber plate which comprises an on-off valve. It is the top view and sectional drawing which show the rubber plate which comprises the on-off valve of a comparative example. It is sectional drawing explaining the experiment which confirms the leak of the reverse direction of the on-off valve provided in the joint pipe. It is sectional drawing explaining the experiment which confirms the airtightness of the on-off valve provided in the joint pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint pipe 12 Tubular part 14 Flow path 16 Connection part 20 On-off valve 22 Step part 24 Rubber plate 24A Circumferential part 25 Support part (support member)
26 Valve body 26B Opening 27 Recessed portion 27A Corner portion 28 Rigid member 30 Sponge member 62 Hose (pipe)
70 Washing tank 90 Rubber plate 92 Support part (support member)
93 Recess 93A Corner S1 Slit S2 Slit

Claims (3)

A cylindrical portion having one end connected to a pipe and a flow path formed, a connection portion provided at the other end of the cylindrical portion, connected to a tank, and provided between the connection portion and the cylindrical portion A joint pipe provided with an open / close valve,
The connecting portion is formed in a size capable of setting a sponge member that can be washed through the pipe,
Between the cylindrical part and the connecting part, a step part is formed with an inner diameter of the cylindrical part larger than an inner diameter of the connecting part,
The on-off valve includes a rubber plate that is fixed to the stepped portion, forms a slit that is cut in a circular shape, leaving a part of the rubber plate, and the circular portion serves as a valve body that closes the flow path. The part is a support member that rotatably supports the end of the valve body toward the cylindrical part,
Furthermore, the support member is made thinner than the rubber plate ,
The joint pipe , wherein the thickness of the rubber plate and the valve body around the support member is made thinner than the thickness of the other rubber plate and the valve body . The joint pipe according to claim 1, wherein a rigid member for preventing a back flow of liquid is attached to a central portion of the valve body . A cleaning method comprising the joint pipe according to claim 1 or 2, wherein the pipe is cleaned.
After setting a sponge member in the connection part,
Connecting the connecting part to a cleaning tank filled with the cleaning liquid;
A cleaning method, wherein the cleaning liquid is introduced from the cleaning tank into the cylindrical portion through the connection portion to open the on-off valve, and the sponge member is sent from the cylindrical portion into the pipe.

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