JP2011236982A - Connection joint and connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection joint capable of easily connecting and separating piping and improving workability.SOLUTION: The connection joint 2 oppositely connects a female-type outflow pipe 113 and a female-type inflow pipe 115 having flanges 113a and 115a respectively at the end, wherein a predetermined distance X is kept between the flanges 113a and 115a. The connection joint 2 has a large-diameter portion 2a with an outer diameter larger than inner diameters of the outflow pipe 113 and the inflow pipe 115 and with a width L1 shorter than the predetermined distance X, a first small-diameter portion 2b extending upward from the topside of the large-diameter portion 2a and having a structure of free insertion into the inflow pipe 115, a second small-diameter portion 2c extending downward from the underside of the large-diameter portion 2a and having a structure of free insertion into the outflow pipe 113, and a throughhole 2d communicating the outflow pipe 113 with the inflow pipe 115.

Description

  The present invention relates to a connection joint and a connection structure, and more particularly to a connection joint for connecting a pair of opposed pipes.

  Conventionally, as one of the pipe connection methods, as shown in FIG. 30, in a state where the tip end portion of one pipe 103 is inserted into the other pipe 104, an end-like annular quick fastener (elastic connection) A metal fitting) 101 is fitted to connect pipes to each other (for example, see Patent Document 1). In this connection method, the tip of the pipe 103 is inserted into the pipe 104 so that the flange 103a of the pipe 103 provided with the male end and the flange 104a of the pipe 104 provided with the female end are brought into contact with each other. When the quick fastener 101 is fitted, the flanges 103 a and 104 a are engaged with the engagement holes 102 of the quick fastener 101, thereby fixing the pipes 103 and 104 so as not to be separated.

  According to the above connection method, the pipes 103 and 104 can be connected with one touch, so that the pipes 103 and 104 can be easily attached and detached as compared with a connection method using screwing such as a nut and union type.

  FIG. 31 is a cross-sectional view showing an example of a connection structure in which the above connection method is applied to the connection between the flow rate adjustment valve and the switching valve. In addition, the connection structure shown to the figure illustrates the case where it connects using the connection coupling 105. FIG.

  The flow rate adjusting valve 111 is provided for adjusting the flow rate of a fluid such as water or hot water from the inflow pipe 112 to flow out to the outflow pipe 113, while the switching valve 114 is a fluid whose flow rate is adjusted by the flow rate adjusting valve 111. Is received in the inflow pipe 115 and is selectively discharged to one of the first and second outflow pipes 116 and 117. In the example shown in FIG. 31, the outflow pipe 113 of the flow rate adjustment valve 111 and the inflow pipe 115 of the switching valve 114 are both pipes having female end portions.

  Each of the flow rate adjusting valve 111 and the switching valve 114 includes a rotating cylindrical body (rotary valve) 120 having an opening 120 a formed on a side surface, and a stepping motor 121 that rotates the rotary valve 120. The flow rate adjusting valve 111 and the switching valve 114 have the same basic configuration, but the valve chamber 122 of the switching valve 114 is open to both the left and right, whereas the valve chamber 123 of the flow rate adjusting valve 111 is In the example, the bottom 124 is closed, and the fluid from the inflow pipe 112 is configured to flow only to the outflow pipe 113. Therefore, the flow tube portion formed on the lower side from the closed bottom portion 124 can be omitted. Note that the illustrated flow rate adjustment valve 111 and switching valve 114 are the same as the flow rate adjustment valve described in Patent Document 2, for example, and thus detailed description thereof is omitted.

  The connection joint 105 is a male joint at both ends, and is provided to relay-connect the outflow pipe 113 of the flow rate adjustment valve 111 and the inflow pipe 115 of the switching valve 114. The connection joint 105 is formed on the outflow pipe 113 and the inflow pipe 115 with a large diameter part 105a having substantially the same diameter as the outer diameters of the flanges 113a and 115a, and above and below the large diameter part 105a. Small diameter portions 105b and 105c having substantially the same diameter as the inner diameter and a through hole 105d for allowing fluid to flow are provided. An O-ring 125 as a seal member is attached to the side surfaces of the small diameter portions 105b and 105c.

  The outflow pipes 116 and 117 and the inflow pipe 112 are connected to a pipe end portion (not shown), for example, in a form in which one end portion is inserted into the other end portion in relation to a male joint and a female joint, for example. Yes.

  When connecting the flow rate adjusting valve 111 and the switching valve 114, the lower diameter portion 105 c on the lower side of the connecting joint 105 is inserted into the outflow pipe 113 of the flow rate adjusting valve 111, and the lower diameter portion 105 b on the upper side of the connecting joint 105 is connected to the switching valve 114. And the flanges 113a and 115a of the inflow pipe 115 are brought into contact with the large-diameter portion 105a of the connection joint 105. In this state, the quick fastener 101 shown in FIG. 30 is fitted, and the flanges 113 a and 115 a and the large diameter portion 105 a are inserted into the insertion hole 102 of the quick fastener 101.

  Further, instead of providing the large-diameter portion 105a, a projection having a triangular cross section that engages with the tapered portion formed at the inner ends of the flanges 113a and 115a is provided on the center outer periphery of the connection joint 105, and the flanges 113a and 115a There is also known one in which the two opposing surfaces are in direct contact with each other.

JP-A-7-260071 JP 2009-228764 A

  In the connection structure shown in FIG. 31, when the flow regulating valve 111 and the switching valve 114 fail, it is necessary to remove and repair the failed one or replace it with a new one. For example, when repairing the flow regulating valve 111, after releasing the connection between the inflow pipe 112 and the pipe end (not shown), the quick fastener 101 is pulled out to release the fixed state with the connection joint 105, Only the flow rate adjusting valve 111 is pulled out to the left side of the drawing.

  However, in the above connection structure, since the small-diameter portion 105c of the connection joint 105 is inserted into the outflow pipe 113 of the flow rate adjustment valve 111, the entire flow rate adjustment valve 111 is removed before the flow rate adjustment valve 111 is pulled out to the left side. It is necessary to move downward and pull out the small diameter portion 105c from the outflow pipe 113. For this reason, the pipes (not shown) connected to the inflow pipe 112 and the outflow pipes 116 and 117 need to be somewhat curved. However, when the pipe is a hard pipe such as a copper pipe, it takes time for the work. There's a problem. In addition, when the flow control valve 111 is set at a high or low place where it is difficult to reach, or when a plurality of devices are densely arranged, there is not enough space to lower the flow control valve 111. Even in this case, there arises a problem that much time and labor are required for removal.

  Further, when the flow rate adjusting valve 111 after repair is attached, after the inflow pipe 112 is connected to a pipe (not shown), the flow rate adjusting valve 111 is positioned below the small diameter portion 105c of the connection joint 105, and then the flow rate is adjusted. It is necessary to raise the entire regulating valve 111 and insert the small diameter portion 105 c into the outflow pipe 113. Therefore, as in the case of detachment, depending on the installation environment, a great deal of effort will be required, and the working time may be prolonged.

  Such a problem also occurs when the switching valve 114 is removed and attached, and is not limited to the connection structure of the valve device. For example, when connecting pipes such as water pipes, The same is true when connecting pipes. Furthermore, the same problem arises even if the end portions of the inflow pipe 113 and the outflow pipe 115 are configured to be male and female, respectively, and one is inserted into the other.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and can easily attach and remove a pipe part or a structure having a pipe part, thereby improving workability. It is an object to provide a connection joint or the like that can be used.

  In order to achieve the above object, the present invention is a connection joint for opposingly arranging first and second pipe portions having flanges and connecting them in a state of being provided with a predetermined interval, and is substantially the same as the flange. A large-diameter portion having an outer diameter of the same diameter and a width narrower than the predetermined interval; a first end portion configured to be freely fitted on an inner periphery or an outer periphery of the first tube portion; A second end portion configured to be freely fitted on the inner periphery or the outer periphery of the two pipe portions, and a through hole communicating with the first and second tube portions are provided.

  And according to this invention, when connecting the 1st and 2nd pipe part, between the 1st pipe part and the large diameter part of a connection joint, or the 2nd pipe part and the large diameter part of a connection joint, Since a gap is formed between or both of them, the position of the connection joint is changed by moving the connection joint by the amount of the gap when attaching or removing the first or second pipe part. Can do. For this reason, the space required for attaching and detaching the first and second pipe portions can be reduced, and the attaching operation and the like can be facilitated.

  In the connection joint, the first and second end portions are fitted to at least one of the first and second pipe portions in a state where the first and second end portions are fitted to inner circumferences or outer circumferences of the first and second pipe portions, respectively. The fitting depth of one of the mounted first and second end portions is set to be equal to or less than the distance between the large diameter portion and the other of the first and second pipe portions with which the large diameter portion abuts. it can.

  In the connection joint, the first and second end portions are fitted to inner peripheries or outer peripheries of the first and second pipe portions, respectively, and the large diameter portion is one of the first and second pipe portions. In the state where the large diameter portion and the large diameter portion are in contact with each other, the fitting depth of one of the first and second end portions fitted to one of the first and second pipe portions is determined by the large diameter portion and the large diameter portion. The distance from the other of the first and second pipe portions that are in contact with each other can be equal to or less than the distance.

  According to these, it is possible to pull out the connection joint from the first or second pipe part only by moving the connection joint, and it becomes easier to remove the first or second pipe part.

  In the connection joint, the contact may be contact between the large diameter portion and one flange of the first and second pipe portions. With this configuration, the two flanges in contact with each other can be fastened and fixed with a quick fastener.

  Further, according to the present invention, female first and second pipe portions having flanges at end portions are arranged opposite to each other, and the first and second pipe portions are connected in a state where a predetermined interval is provided between the flanges. A large-diameter portion having an outer diameter larger than the inner diameters of the first and second tube portions, and extending from the large-diameter portion toward the first tube portion. A first small-diameter portion configured to be insertable into the portion, a second small-diameter portion extending from the large-diameter portion toward the second tube portion and configured to be insertable into the second tube portion, and the first A through-hole penetrating the small-diameter portion, the large-diameter portion, and the second small-diameter portion, and the axial length of the large-diameter portion is shorter than the predetermined interval, and the first small-diameter portion is the first pipe portion. The sum of the length that can be inserted into the axis and the length in the axial direction of the large diameter portion is equal to or less than the predetermined interval, and / or the second small diameter portion can be inserted into the second pipe portion. Length and the sum of the axial length of the large-diameter portion, wherein said is equal to or less than a predetermined distance.

  According to the present invention, when the first and second pipe parts are connected, the flange between the first pipe part and the large diameter part of the connection joint, or the flange of the second pipe part and the large diameter of the connection joint. Since a gap is formed between or both of the first and second pipe parts, the connecting joint is moved by the amount of the gap when attaching or removing the first or second pipe part, and the position of the connecting joint is determined. Can be changed. For this reason, the space required for attaching and detaching the first and second pipe portions can be reduced, and the attaching operation and the like can be facilitated. Moreover, a connection joint can be extracted from a 1st or 2nd pipe part only by moving a connection joint, and the removal of a 1st or 2nd pipe part becomes easier.

  Further, according to the present invention, a female first tube portion having a flange at an end portion and a male second tube portion having a flange at a position spaced from the tip portion are arranged to face each other, and a predetermined interval is provided between the flanges. A connecting joint for connecting the first and second pipe portions with a space of a large diameter portion having an outer diameter larger than the inner diameter of the first and second pipe portions; A small-diameter portion that extends from the diameter portion toward the first tube portion and is configured to be freely inserted into the first tube portion, and is formed inside the large-diameter portion, so that the tip portion of the second tube portion can be inserted freely. A columnar hole configured to pass through the small diameter part and the large diameter part and communicate with the columnar hole, the axial length of the large diameter part being shorter than the predetermined interval, The sum of the length that allows the distal end portion of the second tube portion to be inserted into the columnar hole and the axial length of the large diameter portion is equal to or less than the predetermined interval. And / or, wherein the sum of the axial length of the insertable length of the small diameter portion in the first tubular portion and the large diameter portion is less than the predetermined distance. According to the present invention, the space required for attaching and detaching the first and second pipe portions can be reduced as in the case of the above invention, and the attaching operation and the like can be facilitated.

  Further, according to the present invention, male first and second pipe parts having flanges are arranged opposite to each other at a position spaced from the tip part, and the flange between the first pipe part and the tip part of the second pipe part are arranged. A connecting joint for connecting the first and second pipe parts in a state where a predetermined interval is provided, a large-diameter part having an outer diameter larger than the inner diameter of the first and second pipe parts, A columnar hole formed inside the large-diameter portion and configured to be freely insertable at the tip of the first tube portion, and extends from the large-diameter portion toward the second tube portion. A small-diameter portion configured to be freely insertable, and a through-hole that penetrates the small-diameter portion and the large-diameter portion and communicates with the columnar hole, the axial length of the large-diameter portion being longer than the predetermined interval The sum of the length of the first tube portion that can be inserted into the columnar hole and the length of the large-diameter portion in the axial direction is equal to or less than the predetermined interval, and / or It is characterized in that the small diameter portion is the sum of the axial length of the insertable length and the large diameter portion to the second tubular portion is less than the predetermined distance. According to the present invention, the space required for attaching and detaching the first and second pipe portions can be reduced as in the case of the above invention, and the attaching operation and the like can be facilitated.

  In the connection joint, the large-diameter portion may be provided with a recess at the center so that protrusions are formed at both ends thereof. According to this, a recessed part can be utilized as a handle and it becomes possible to move a connection joint smoothly.

  In the connection joint, when fluid flows from the first pipe part toward the second pipe part in a state where the first and second pipe parts are connected, the fluid flows from the first pipe part into the connection joint. A check valve that allows the fluid to flow and blocks the flow of the fluid flowing out from the connection joint to the first pipe portion can be provided in the through hole. According to this, fluid leakage when the first or second pipe part is removed can be prevented, and workability can be further improved.

  Furthermore, this invention is a connection structure which connects the 1st and 2nd pipe part which has a flange, Comprising: The connection joint in any one of the said that was fitted by the both end surfaces of the said 1st and 2nd pipe part, And a detachable fastener for connecting the large diameter portion of the connection joint and the first and second pipe portions.

  Moreover, this invention is a connection structure which connects the 1st and 2nd pipe part which has a flange, Comprising: The connection coupling in any one of the said that was fitted by the both end surfaces of the said 1st and 2nd pipe part, A detachable fastener for connecting the large-diameter portion of the connection joint and the first and second pipe portions, and the second pipe portion from the first pipe portion in a state where the first and second pipe portions are connected. When fluid is circulated toward the pipe part, the flow of fluid flowing into the second pipe part from the connection joint is allowed and the flow of fluid flowing out from the second pipe part to the connection joint is blocked. A check valve body, and the check valve body is provided in the second pipe portion and contacts and separates from an end portion of the connection joint.

  According to the present invention, fluid leakage when the first or second pipe portion is removed can be prevented, and workability can be further improved. Further, the check valve function can be achieved only by the check valve body, and the fluid leakage prevention function when removing various fluid devices and pipes can be realized with an extremely simple configuration.

  In the above connection structure, the check valve body extends from the disc portion into the through-hole of the connection joint and opens and closes the opening of the through-hole of the connection joint. And a guide leg sliding on the top.

  In the above connection structure, the check valve body can be brought into contact with a member in the second pipe portion located on the side opposite to the end of the connection joint, and the member in the second pipe portion. Can be a rotary valve of the valve device.

  The said connection structure WHEREIN: The said fastener can be used as the end-end annular elastic connection tool provided with the end ring part in which the insertion hole was pierced. According to this, attachment and detachment of a fastener can be performed easily and it becomes possible to fix a 1st pipe part, a 2nd pipe part, and a connection coupling easily.

  In the above connection structure, the elastic connecting members are arranged in parallel at a predetermined interval, and each of the plurality of end ring portions each having an insertion hole is connected to the plurality of end ring portions. And a connecting portion to be provided. According to this, the first pipe part, the second pipe part, and the connecting joint can be fixed by a single fitting operation, and the fixation can be released by a single pulling operation. It is possible to further improve the performance.

  As described above, according to the present invention, it is possible to easily attach and remove the pipe part or the structure having the pipe part, and it is possible to improve workability.

It is sectional drawing which shows 1st Embodiment, such as a connection coupling concerning this invention. It is a figure which shows the connection joint of FIG. 1, Comprising: (a) is an enlarged view of B part of FIG. 1, (b) is the front view described in the state which does not make (a) a cross section, ( c) is a top view of (b). It is a perspective view which shows the quick fastener of FIG. 1, Comprising: (a) is a figure which shows a 1st quick fastener, (b) is a figure which shows a 2nd quick fastener. It is process drawing which shows the connection method of the connection structure of FIG. It is process drawing which shows the removal method of the connection structure of FIG. It is sectional drawing for demonstrating the dimensional condition of the connection coupling of FIG. It is sectional drawing which shows the connection coupling in case the dimension conditions of FIG. 6 are not satisfy | filled. It is sectional drawing for demonstrating the dimension conditions of a connection coupling. It is sectional drawing for demonstrating the dimension conditions of a connection coupling. It is sectional drawing which shows 2nd Embodiment, such as a connection coupling concerning this invention. It is a perspective view which shows the quick fastener of FIG. It is the enlarged view of the C section of Drawing 10, and (a) is a front view described in the state where C section is not made into a section, and (b) is a top view of (a). It is sectional drawing which shows the other example of the connection coupling of FIG. It is sectional drawing which shows 3rd Embodiment, such as a connection coupling concerning this invention. It is sectional drawing which shows 4th Embodiment, such as a connection coupling concerning this invention. It is a figure which shows the 1st connection structure of FIG. 15, Comprising: (a) is an enlarged view of a 1st connection structure, (b) is a figure which shows the connection method of a 1st connection structure, (c) These are figures which show the removal method of a 1st connection structure. It is sectional drawing for demonstrating the dimension condition of the connection coupling in a 1st connection structure. It is sectional drawing for demonstrating the dimension condition of the connection coupling in a 1st connection structure. It is sectional drawing for demonstrating the dimension condition of the connection coupling in a 1st connection structure. It is sectional drawing which shows the other example of the 1st connection structure of FIG. FIG. 16 is a diagram illustrating the second connection structure of FIG. 15, wherein (a) is an enlarged view of the second connection structure, and (b) is a diagram illustrating a connection method in the second connection structure; ) Is a diagram showing a removal method in the second connection structure. It is sectional drawing for demonstrating the dimension condition of the connection coupling in a 2nd connection structure. It is sectional drawing for demonstrating the dimension condition of the connection coupling in a 2nd connection structure. It is sectional drawing which shows 5th Embodiment, such as a connection coupling concerning this invention. It is an enlarged view of E part of FIG. It is sectional drawing which shows the removal method of the connection structure of FIG. It is a perspective sectional view showing a 6th embodiment, such as a connection joint concerning the present invention. It is a figure which shows the valve body of FIG. 27, Comprising: (a) is an enlarged view of G part of FIG. 27, (b) is the elements on larger scale of the valve body of (a). FIG. 28 is a perspective sectional view showing a method for removing the connection structure of FIG. 27. It is a perspective view which shows an example of the conventional piping connection structure. It is sectional drawing which shows an example of the connection structure of the valve apparatus to which the piping connection structure of FIG. 30 is applied.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following description, a case where the connection joint, the connection structure, and the elastic connector according to the present invention are applied to the connection between the flow rate adjusting valve and the switching valve will be exemplified. Also, the same or equivalent components as those in FIG. 31 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 shows a first embodiment of a connection joint or the like according to the present invention, and this embodiment is suitable for connecting pipes having female end portions. In the connection structure 1 shown in FIG. 1, the outflow pipe 113 of the flow rate adjustment valve 111 and the inflow pipe 115 of the switching valve 114 are arranged to face each other with a predetermined interval X, and the outflow pipe 113 and the inflow pipe 115 are connected to each other. The first and second quick fasteners (elastic connectors) 3 and 4 are fitted so as to be connected via the connection joint 2 and cover a part of both the pipes 113 and 115 and the connection joint 2.

  The flow rate adjusting valve 111 is provided for adjusting the flow rate of the fluid from the inflow pipe 112 and allowing the fluid to flow out to the outflow pipe 113, while the switching valve 114 provides the first and second fluids adjusted by the flow rate adjusting valve 111. It is provided for selectively flowing out either one of the two outflow pipes 116, 117.

  Each of the outflow pipes 116 and 117 of the switching valve 114 has a female connection end. For example, the distal ends of copper pipes 7 and 8 having a male connection end are inserted, and the quick fasteners (non-fasteners) It is fastened with (shown). Similarly, the inflow pipe 112 of the flow regulating valve 111 also has a female connection end. For example, the tip of a copper pipe 9 having a male connection end is inserted and fastened with a quick fastener (not shown). Has been.

  A check valve 5 is provided in the second outflow pipe 117 of the switching valve 114 to prevent fluid from leaking out of the inflow pipe 115 when the flow rate adjustment valve 111 is removed. The check valve 5 includes a valve body 5a that reciprocates in the left-right direction on the paper surface and a spring 5b that biases the valve body 5a toward the valve seat 5c. In the check valve 5, when the valve body 5a moves to the left, the valve port 5d is opened to allow the flow of fluid in the direction of arrow A, and when the valve body 5a moves to the right, the valve body An elastic member 5e provided at the tip of 5a abuts on the valve seat 5c to close the valve port 5d, thereby blocking the flow of fluid in the direction opposite to the arrow A.

  The connection joint 2 is a male joint at both ends, and is provided to relay-connect the outflow pipe 113 of the flow rate adjustment valve 111 and the inflow pipe 115 of the switching valve 114. As shown in FIG. 2A, the connection joint 2 includes a large diameter portion 2a, a first small diameter portion 2b extending upward from the upper surface of the large diameter portion 2a, and having substantially the same diameter as the inner diameter of the inflow pipe 115. The second small-diameter portion 2c extends downward from the lower surface of the large-diameter portion 2a and has substantially the same diameter as the inner diameter of the outflow pipe 113, and a through-hole 2d for allowing fluid to flow therethrough.

  The length L1 of the large diameter portion 2a in the axis 2i direction (the width of the large diameter portion 2a) is shorter than the interval X between the flange 113a of the outflow pipe 113 and the flange 115a of the inflow pipe 115, as shown in FIG. Formed as follows. Further, as shown in FIG. 2 (a), a first annular protrusion 2e having an outer diameter and a thickness substantially the same as the flange 115a of the inflow pipe 115 are respectively formed on the upper end and the lower end of the large diameter portion 2a. A second annular projection 2f having an outer diameter and a thickness substantially the same as the flange 113a of the outflow pipe 113 is provided, and an annular recess 2g is formed between the first and second annular projections 2e and 2f. Is done.

  Further, annular recesses for mounting O-rings 125 are formed at both ends of the connection joint 2, and the connection joint 2 is connected to the outflow pipe 113 and the inflow pipe by the O-rings 125 arranged in the recesses. Airtightness when connected to 115 is ensured.

  Returning to FIG. 1, the first quick fastener 3 is a fastener for fixing the inflow pipe 115 of the switching valve 114 and the connection joint 2, and has the same configuration as the quick fastener 101 of FIG. 30. As shown in FIG. 3 (a), the first quick fastener 3 includes an end ring part 3a, a handle part 3b formed at the center of the end ring part 3a, and an end ring part 3a. And a guide piece 3c formed at the end of the.

  In both side surfaces of the first quick fastener 3, continuous insertion holes 3 d are formed from the handle portion 3 b to the guide piece 3 c. As shown in FIGS. 2B and 2C, when the first quick fastener 3 is fitted in the engagement hole 3d, the flange 115a of the inflow pipe 115 of the switching valve 114 and the connection joint 2 The first annular protrusion 2e is engaged. Note that the width W1 of the engagement hole 3d is formed to be substantially equal to the sum of the thicknesses of the flange 115a and the first annular protrusion 2e.

  Returning to FIG. 1, the second quick fastener 4 is a fastener for preventing the outflow pipe 113 of the flow rate adjustment valve 111 from falling off from the second small diameter portion 2 c (see FIG. 2A) of the connection joint 2. . As shown in FIG. 3 (b), the second quick fastener 4 includes an end ring portion 4 a, a handle portion 4 b, a guide piece 4 c, and an engagement hole 4 d, as in the first quick fastener 3. However, the total length L2 is longer than that of the first quick fastener 3, and the width W2 of the engagement hole 4d is formed wider than the width W1 of the engagement hole 3d of the first quick fastener 3.

  When the second quick fastener 4 is fitted, as shown in FIG. 2 (b), the second annular protrusion 2f of the connection joint 2 is engaged with the upper portion of the engagement hole 4d, and the engagement hole 4d. The flange 113a of the outflow pipe 113 of the flow rate adjusting valve 111 is engaged in the lower part of the valve.

  Next, a method for connecting the outflow pipe 113 of the flow rate adjusting valve 111 and the inflow pipe 115 of the switching valve 114 will be described with reference to FIGS.

  When connecting the pipes 113 and 115, first, as shown in FIG. 4A, the second small diameter portion 2c of the connection joint 2 is inserted into the outflow pipe 113 of the flow regulating valve 111 (that is, the second small diameter portion 2c). Is fitted to the inner periphery of the outflow pipe 113. Next, as shown in FIG. 4 (b), the inflow pipe 115 of the switching valve 114 is arranged oppositely, and the first small diameter portion 2 b of the connection joint 2 is inserted into the inflow pipe 115.

  Next, as shown in FIG. 4C, the first quick fastener 3 is fitted into the connection portion between the inflow pipe 115 and the connection joint 2. At this time, as described above, the flange 115a of the inflow pipe 115 of the switching valve 114 and the first annular protrusion 2e of the connection joint 2 are engaged with the engagement hole 3d of the first quick fastener 3 (FIG. 2 ( b)), the inflow pipe 115 and the connection joint 2 are fixed.

  Next, the switching valve 114 and the connection joint 2 are pushed up to raise the switching valve 114 to a target installation position. Thus, a gap 6 is formed between the flange 113a of the outflow pipe 113 of the flow rate adjusting valve 111 and the second annular protrusion 2f of the connection joint 2.

  Finally, as shown in FIG. 4 (d), the second quick fastener 4 is fitted into the connection portion between the outflow pipe 113 of the flow rate adjustment valve 111 and the connection joint 2, and the second annular protrusion 2 f of the connection joint 2 and the outflow The flange 113 a of the tube 113 is engaged with the engagement hole 4 d of the second quick fastener 4.

  Here, in the above configuration, since the connection joint 2 is suspended from the inflow pipe 115 of the switching valve 114 and floats from the outflow pipe 113 of the flow rate adjustment valve 111, the switching valve 114, the connection joint 2 and the flow rate adjusting valve 111, there is no one that supports the switching valve 114. As shown in FIG. 1, the switching valve 114 includes the first and second outlet pipes. 116 and 117 are supported by the pipes 7 and 8, and the flow rate adjusting valve 111 is supported by the pipe 9 connected to the inflow pipe 112, so that each position (height) is fixed.

  In the above connection method, after the connection joint 2 is inserted into the outflow pipe 113 of the flow rate adjustment valve 111, the inflow pipe 115 of the switching valve 114 is disposed oppositely. When there are few restrictions, after connecting the inflow pipe | tube 115 and the connection coupling 2 of the switching valve 114, and fixing with the 1st quick fastener 3, you may make it insert the connection coupling 2 in the outflow pipe | tube 113 of the flow regulating valve 111. Good.

  Further, if the flow rate adjusting valve 111 and the switching valve 114 are connected in advance to the pipes 7 to 9, a predetermined distance is secured between the outflow pipe 113 and the inflow pipe 115. Attachment may be performed by pulling out and inserting the joint 2 into the inflow pipe 115 side from the state in which 2 is inserted (FIG. 4A) (FIG. 4C).

  Next, a method for removing the flow rate adjusting valve 111 and the switching valve 114 will be described with reference to FIGS. 1 to 3 and FIG. Here, a case where the flow rate adjustment valve 111 is removed will be described as an example.

  First, the flow of the fluid flowing into the flow rate adjusting valve 111 is stopped, the valve body angle of the switching valve 114 is adjusted, and the flow between the switching valve 114 and the outflow pipe 116 is shut off (the switching valve 114 is connected to the inflow pipe). 115 and only the outflow pipe 117 are in communication with each other).

  Next, as shown in FIGS. 5A and 5B, the first quick fastener 3 is pulled out, and the fixed state of the inflow pipe 115 of the switching valve 114 and the connection joint 2 is released. At this time, the second quick fastener 4 is also pulled out in order to avoid hindering subsequent work.

  Next, as shown in FIG. 5C, the connection joint 2 is lowered by the length of the gap 6 (until the second annular protrusion 2f of the connection joint 2 abuts on the flange 113a of the inflow pipe 113), The first small diameter portion 2b of the connection joint 2 is pulled out from the inflow pipe 115 of the switching valve 114. At this time, if the connection joint 2 does not descend due to its own weight, the annular recess 2g formed between the first and second annular protrusions 2e and 2f is picked by hand and pushed downward.

  Here, the check valve 5 is closed by the pressure of the fluid existing on the pipe 7 side, and the fluid existing on the pipe 7 side is prevented from leaking to the inflow pipe 115 side. The fluid is about the amount accumulated in the valve body of the switching valve 114.

  Next, the connection between the inflow pipe 112 (see FIG. 1) of the flow rate adjusting valve 111 and the pipe 9 is released, and then the flow rate adjusting valve 111 is moved leftward as shown in FIG. Take out.

  Note that the quick fastener 3 that has been removed is used for fixing the second annular projection 2f and the flange 113a of the outflow pipe 113 during or after the withdrawal or until the flow rate adjusting valve 111 is attached again. Can do.

  When removing the switching valve 114, after performing the steps of FIGS. 5A to 5C, the connection between the outflow pipes 116 and 117 of the switching valve 114 and the pipes 7 and 8 (see FIG. 1) is released. Thereafter, the pipe 7 and / or the pipe 8 may be expanded to the outside somewhat.

  In this way, the connection joint 2 can be extracted from the inflow pipe 115 by simply moving the connection joint 2 between the outflow pipe 113 and the inflow pipe 115 without changing the positions of the flow rate adjusting valve 111 and the switching valve 114. Therefore, the flow rate adjustment valve 111 can be easily removed.

  By the way, in order to implement | achieve the above-mentioned removal method, as shown in FIG.5 (b), (c), only the 1st small diameter of the connection coupling 2 from the inflow pipe | tube 115 of the switching valve 114 is lowered | hung only by dropping. It is necessary to be able to pull out the part 2b. Therefore, the connection joint 2 is configured to satisfy the following condition.

  As shown in FIG. 6, the length (in this case, the length of the first small-diameter portion 2b) in which the first small-diameter portion 2b of the connection joint 2 can be inserted is “a”, and the length of the gap 6 (of the connection joint 2 When “displaceable amount” is “A”, a ≦ A (conditional expression 1) needs to be satisfied in order to lower the connection joint 2 and pull out the first small diameter portion 2b.

  Here, when the length L1 of the large-diameter portion 2a of the connection joint 2 is added to both sides of the conditional expression 1, a + L1 ≦ A + L1 (conditional expression 2) is satisfied, but A + L1 on the right side is the flange 115a of the inflow pipe 115. And the flange 113a of the outflow pipe 113, the conditional expression 1 can be rewritten as a + L1 ≦ X.

  Accordingly, the dimensions of the connection joint 2 are determined so that the sum of the length a into which the first small diameter portion 2b can be inserted and the length L1 of the large diameter portion 2a is equal to or less than the interval X between the flanges 113a and 115a. Thus, the operations shown in FIGS. 5B and 5C are made possible.

  The connection joint 2 does not necessarily satisfy the above-described condition. As shown in FIG. 7B, when the connection joint 2 is lowered, the first small diameter portion 2b is connected to the inflow pipe 115 of the switching valve 114. It may be in a state where a part is inserted without being completely removed from.

  In this case, it is not possible to pull out the switching valve 114 and the flow rate adjusting valve 111 only by moving the connection joint 2, but as shown in FIGS. 7A and 7B, the connection joint 2 is lowered, Since the insertion amount d of the first small-diameter portion 2b decreases, as shown in FIG. 7C, the switching valve 114 is increased by a small amount, or the flow rate adjustment valve 111 is decreased by a small amount. The valve 111 can be withdrawn. That is, as compared with the conventional case shown in FIG. 31, the push-up amount of the switching valve 114 and the push-down amount of the flow rate adjusting valve 111 can be reduced, and attachment and removal operations are facilitated.

  As described above, according to the present embodiment, when the flow rate adjusting valve 111 and the switching valve 114 are connected, the gap between the flange 113a of the outflow pipe 113 of the flow rate adjusting valve 111 and the large diameter portion 2a of the connection joint 2. Since the gap 6 is formed, the connecting joint 2 can be moved up and down by the amount of the gap 6 to change the position of the upper end portion of the connecting joint 2 when the flow regulating valve 111 is attached or detached. For this reason, the space required for attachment and detachment is small, and it is possible to easily perform attachment work and the like.

  In the above embodiment, the case where the first small-diameter portion 2b of the connection joint 2 is pulled out from the inflow pipe 115 of the switching valve 114 is illustrated, but as shown in FIG. A gap 10 may be formed between the connecting joint 2 and the large-diameter portion 2 a, the connecting joint 2 may be raised, and the second small-diameter portion 2 c of the connecting joint 2 may be pulled out from the outflow pipe 113.

  In this case, in order to enable the flow rate adjusting valve 111 to be pulled out only by moving the connection joint 2, the connection joint 2 can be inserted with the second small diameter portion 2 c (length of the second small diameter portion 2 c) b. Is equal to or less than the length B of the gap 10, and the sum of the length b into which the second small diameter portion 2c can be inserted and the length L1 of the large diameter portion 2a is defined as the flange 115a of the inflow pipe 115 and the outflow pipe 113. The distance to the flange 113a may be equal to or less than the distance X (the sum of the length L1 of the large diameter portion 2a and the length B of the gap 10).

  Furthermore, as shown in FIG. 9, gaps 6 and 10 are formed above and below the large-diameter portion 2a, and in this state, the connection joint 2 is formed by an appropriate method (for example, the flange portion of the outflow pipe 113, the connection joint 2 If the large diameter portion 2a and the flange portion of the inflow pipe 115 are individually fixed (using a quick fastener or the like provided with three engagement holes), the inflow pipe 115 and the flow rate of the switching valve 114 are fixed. The connection joint 2 can be pulled out from any of the outlet pipe 113 of the regulating valve 111. In this case, in order to enable the switching valve 114 and the flow rate adjusting valve 111 to be pulled out only by moving the connection joint 2, as can be understood from the above description, in the connection joint 2, a ′ ≦ A (that is, a + L1 ≦ X) and b ′ ≦ B (that is, b + L1 ≦ X) may be satisfied.

  Here, “a ′” in the figure is the length by which the first small diameter portion 2b of the connection joint 2 is inserted into the inflow pipe 115 when the inflow pipe 115 and the outflow pipe 113 are connected. Is a length (a ′ + B) into which the first small diameter portion 2b can be inserted. In addition, “b ′” is the length by which the second small diameter portion 2c of the connection joint 2 is inserted into the outflow pipe 113 when both the pipes 115 and 113 are connected, and “b” is the second small diameter portion. This is a length (b ′ + A) in which 2c can be inserted.

  Next, a second embodiment of the connection joint and the like according to the present invention will be described with reference to FIGS. In these drawings, the same or equivalent components as in FIGS. 1 to 9 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 10, the connection structure 20 of the present embodiment has the same configuration as the connection structure 1 of the first embodiment except for the quick fastener 23. The quick fastener 23 is a practical integration of the first and second quick fasteners 3 and 4 shown in FIG. 3, and, as shown in FIG. 11, two end ends arranged in parallel at a predetermined interval. The annular portions 23a and 23b are connected to each other.

  The end ring portions 23a and 23b are respectively formed with handle portions 23c and 23d and guide pieces 23e and 23f. The handle portions 23c and 23d and the guide pieces 23e and 23f are partially connected to the connecting portions 23g and 23h. Connected through. In addition, the connection part 23h which connects the guide pieces 23e and 23f can be abbreviate | omitted as shown in FIG.11 (b). In addition, a plurality of holes 23i are formed on the upper surfaces of the handle portions 23c and 23d and the connecting portion 23g in order to make it easy to visually recognize the inside during connection and to reduce the weight, but these can also be omitted. It is.

  As in the case of the first and second quick fasteners 3 and 4 shown in FIG. 3, engaging holes 23j and 23k are formed on the side surfaces of the respective end ring portions 23a and 23b. When the quick fastener 23 is fitted, as shown in FIG. 12 (a), the flange 115a of the inflow pipe 115 of the switching valve 114 and the connecting joint 2 are inserted into the engaging hole 23j of the end-ended annular portion 23a. The first annular protrusion 2e is engaged, and the flange 113a of the outflow pipe 113 of the flow rate adjusting valve 111 is engaged in the engagement hole 23k of the end ring portion 23b.

  According to the present embodiment, the outflow pipe 113, the connecting joint 2 and the inflow pipe 115 can be fixed by a single fitting operation, and can be released by a single pulling operation. It becomes possible to further improve workability. Furthermore, the outflow pipe 113, the connection joint 2 and the inflow pipe 115 can be fixed together, and the connection structure is solid.

  In the above embodiment, since the connecting joint 2 of the first embodiment is diverted, as shown in FIG. 12A, the second annular projection 2f of the connecting joint 2 and the end circle of the quick fastener 23 are used. As shown in FIG. 13, the gap 24 is formed between the ring portion 23 a and the second joint between the first and second annular protrusions 2 e and 2 f in the connection joint 2. You may make it contact 2f with the end ring part 23a of the quick fastener 23. FIG.

  Next, a third embodiment of the connection joint and the like according to the present invention will be described with reference to FIG. In these drawings, the same components as those in FIGS. 1 to 13 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 14, the connection structure 30 of the present embodiment has the same configuration as the connection structure 20 of the second embodiment except for the connection joint 32. The connection joint 32 is obtained by omitting the annular recess 2g and the second annular projection 2f of the connection joint 2 shown in FIG. 2A, and the large-diameter portion 32a is configured by a single annular projection.

  According to the present embodiment, since the configuration of the connection joint can be simplified, it becomes possible to reduce the manufacturing cost of the connection joint, and the outflow pipe 113, the connection joint 32, and the inflow pipe 115 are respectively connected. It can be fixed as a unit, and the connection structure is solid.

  Next, a fourth embodiment of the connection joint and the like according to the present invention will be described with reference to FIGS. In these drawings, the same or equivalent components as in FIGS. 1 to 14 are denoted by the same reference numerals, and the description thereof is omitted.

  The connection structure 40 shown in FIG. 15 is connected to the first outlet pipe 43 and the right pipe 44 of the switching valve 114 and to the second outlet pipe 45 and the left pipe 46 of the switching valve 114, respectively. Is applied. However, the former connects a pipe having a male end (pipe 44) to a pipe having a female end (first outflow pipe 43), whereas the latter has a pipe having a male end (first pipe). 2) A pipe (pipe 46) having a male end is connected to the outflow pipe 45). Since the connection types are different, the “first connection structure 41” and “second connection structure 42” are respectively described below. "And will be described individually.

  First, the first connection structure 41 will be described with reference to FIGS.

  In the first connection structure 41, as shown in FIG. 16 (a), via a connection joint 52 in which the end on the first outflow pipe 43 side is formed in a male shape and the end on the pipe 44 side is formed in a female shape. The first outflow pipe 43 and the pipe 44 are connected to each other, and the quick fastener 23 having two end ring portions 23a and 23b so as to cover a part of both the pipes 43 and 44 and the connection joint 52. Is inserted.

  The connection joint 52 is formed on the inner side of the large-diameter portion 52a, the large-diameter portion 52a, the cylindrical hole 52b having substantially the same diameter as the outer diameter of the distal end portion 44a of the pipe 44, and the left direction from the left side surface of the large-diameter portion 52a. And a small diameter portion 52c having substantially the same diameter as the inner diameter of the first outflow pipe 43 of the switching valve 114, and a through hole 52d for allowing fluid to flow therethrough.

  The length L3 of the large diameter portion 52a in the direction of the axis 52i (the width of the large diameter portion 52a) is formed to be shorter than the interval Y between the flange 44b of the pipe 44 and the flange 43b of the first outflow pipe 43. Further, at the left end and the right end of the large diameter portion 52a, a first annular protrusion 52e having an outer diameter and a thickness substantially the same as the flange 44b of the pipe 44 and a flange 43b of the first outflow pipe 43, respectively. A second annular protrusion 52f having the same outer diameter and thickness is provided, and an annular recess 52g is formed between the first and second annular protrusions 52e and 52f.

  In connecting the pipe 44 and the first outflow pipe 43, first, the small diameter portion 52c of the connection joint 52 is inserted into the first outflow pipe 43, and then the connection joint 52 is moved to the right as shown in FIG. Move to. Thereby, the flange 43b of the first outflow pipe 43 and the connection joint 52 are inserted while inserting the distal end portion 44a of the pipe 44 into the cylindrical hole 52b of the connection joint 52 (that is, fitting the cylindrical hole 52b to the outer periphery of the distal end portion 44a). A gap 53 is formed between the second annular protrusion 52f.

  Finally, as shown to Fig.16 (a), the quick fastener 23 is inserted in the connection part of the 1st outflow pipe 43, the connection coupling 52, and the piping 44, and the whole is fixed. At this time, the flange 44b of the pipe 44 and the first annular protrusion 52e of the connection joint 52 are engaged with the engagement hole 23j (see FIG. 11A) of the quick fastener 23, and the engagement hole of the quick fastener 23 is engaged. The flange 43b of the first outflow pipe 43 is engaged with 23k (see FIG. 11A).

  On the other hand, when removing the pipe 44 and the switching valve 114, first, the quick fastener 23 is pulled out, and the fixed state of the first outflow pipe 43, the connection joint 52, and the pipe 44 is released. Next, as shown in FIG. 16C, the connection joint 52 is moved leftward by the gap 53 (see FIG. 16B), and the large-diameter portion 52 a of the connection joint 52 is moved to the distal end portion 44 a of the pipe 44. Extract from.

  As will be described later, since the second connection structure 42 can be similarly cut off, the switching valve 114 is then pulled out in a direction perpendicular to the central axis of the outflow pipes 43 and 45 without changing the positions of the pipes 44 and 45. It becomes possible. In the state of FIG. 16C, the second annular protrusion 52f and the flange 43b can be fixed using the quick fastener 3 as shown in FIG.

  As described above, also in the present embodiment, the connection joint 52 is moved from the pipe 44 to the connection joint 52 only by moving the connection joint 52 between the pipe 44 and the first outflow pipe 43 without changing the positions of the pipe 44 and the switching valve 114. Can be extracted. For this reason, similarly to the case of the first embodiment, the switching valve 114 can be easily removed, and workability can be improved.

  In the connection joint 52, conditions for realizing the removal method of FIG. 16 (c) are as follows.

  As shown in FIG. 17, the length (in this case, the length of the distal end portion 44a) at which the distal end portion 44a of the pipe 44 can be inserted into the cylindrical hole 52b is “r”, and the second end from the right end of the flange 43b of the piping 43 When the distance to the left end of the annular protrusion 52f (the length of the gap 53) is “R”, the connecting joint 52 is moved to the left side of the page, and the large-diameter portion 52a of the connecting joint 52 is moved from the tip 44a of the pipe 44. Is required to satisfy r ≦ R (conditional expression 1).

  Here, when the length L3 of the large-diameter portion 52a of the connection joint 52 is added to both sides of the conditional expression 1, r + L3 ≦ R + L3 (conditional expression 2) is satisfied, but R + L3 on the right side is the value of the first outflow pipe 43. Since the distance Y between the flange 43b and the flange 44b of the pipe 44 is satisfied, the conditional expression 1 can be rewritten as r + L3 ≦ Y (in other words, L3 ≦ Y−r). Yr is the distance between the tip of the pipe 44 and the tip of the pipe 43.

  Therefore, in order to realize the removal method of FIG. 16C, the sum of the length r into which the distal end portion 44a of the pipe 44 can be inserted and the length L3 of the large diameter portion 52a is the distance between the flanges 43b and 44b. Connection so that the length L3 of the large-diameter portion 52a is equal to or less than the difference between the distance Y between the flanges 43b and 44b and the length r into which the distal end portion 44a of the pipe 44 can be inserted. The dimensions of the joint 52 may be determined. However, the depth D1 of the cylindrical hole 52b needs to be equal to or longer than the length r into which the tip end portion 44a of the pipe 44 can be inserted. Further, this condition is not essential as in the case of the first embodiment.

  Moreover, in the said embodiment, although the case where the large diameter part 52a of the connection coupling 52 was extracted from the front-end | tip part 44a of the piping 44 was illustrated, as shown in FIG. A gap 54 may be formed between the flange 44b of the pipe 44 and the connecting joint 52 may be moved rightward so that the small diameter portion 52c of the connecting joint 52 is pulled out from the first outflow pipe 43 of the switching valve 114. .

  In this case, in order to allow the piping 44 and the switching valve 114 to be pulled out only by moving the connection joint 52, the connection joint 52 is long enough to insert the small diameter portion 52c (in this case, the length of the small diameter portion 52c). It is sufficient that s be a distance from the left end of the flange 44b of the pipe 44 to the right end of the first annular protrusion 52e (the length of the gap 54) S or less (s ≦ S), and the length capable of inserting the small diameter portion 52c. s and the length L3 of the large-diameter portion 52a (that is, the length of the connection joint) is the sum of the distance Y between the flanges 43b and 44b (the length L3 of the large-diameter portion 52a and the length S of the gap 54). ) (S + L3 ≦ Y) below (in other words, L3 ≦ Y−s). However, the width D2 between the bottom surface of the cylindrical hole 52b and the left end of the pipe 44 needs to be not less than the distance S.

  Further, as shown in FIG. 19, gaps 53 and 54 are formed on the left and right of the large diameter portion 52 a, and the large diameter portion 52 a of the connection joint 52 can be extracted from the tip end portion 44 a of the pipe 44, while the first outflow pipe 43. It is also possible to configure so that the small-diameter portion 52c of the connection joint 52 can be pulled out from. In this case, in order to enable the piping 44 and the switching valve 114 to be pulled out to the front side, it is only necessary to satisfy both r ′ ≦ R and s ′ ≦ S in the connection joint 52, and r + L3 ≦ Y and s + L3 ≦ Y ( In other words, both L3 ≦ Yr and L3 ≦ Ys) may be satisfied. However, the depth D1 of the cylindrical hole 52b is equal to or longer than the length r into which the tip end portion 44a can be inserted, and the width D2 between the bottom surface of the cylindrical hole 52b and the left end of the pipe 44 is a distance (length of the gap 54). It must be greater than or equal to S.

  Here, “r ′” in the drawing is the length by which the distal end portion 44a of the pipe 44 is inserted into the cylindrical hole 52b of the connection joint 52 when the pipe 44 and the first outflow pipe 43 are connected. “r” is a length (r ′ + S) in which the distal end portion 44a can be inserted. In addition, “s ′” is a length in which the small diameter portion 52c of the connection joint 52 is inserted into the first outflow pipe 43 when both the pipes 44 and 43 are connected, and “s” is the length of the small diameter portion 52c. Insertable length (s ′ + R).

  Moreover, in the said embodiment, although the quick fastener 23 which has two end ring parts 23a and 23b is used as a fastener, as shown to Fig.20 (a), as shown in FIG. Second quick fasteners 3 and 4 may be used. Furthermore, as shown in FIG.20 (b), in the large diameter part 52a of the connection coupling 52, a 2nd annular protrusion may be abbreviate | omitted and a simplification may be achieved.

  Next, the second connection structure 42 of FIG. 15 will be described with reference to FIGS.

  In the second connection structure 42, as shown in FIG. 21 (a), the end portion on the second outflow pipe 45 side is formed in a female shape and the end portion on the pipe 46 side is formed in a male shape via a connection joint 62. Then, the second outflow pipe 45 and the pipe 46 are connected, and the quick fastener 23 is fitted so as to cover a part of both the pipes 45 and 46 and the connection joint 62.

  The connection joint 62 is formed inside the large diameter portion 62a, the large diameter portion 62a, a cylindrical hole 62b having the same diameter as the outer diameter of the tip portion 45a of the second outflow pipe 45, and the left side surface of the large diameter portion 62a. And a small-diameter portion 62c that is substantially the same diameter as the inner diameter of the pipe 46, and a through-hole 62d for allowing fluid to flow therethrough.

  A length L3 of the large diameter portion 62a in the direction of the axis 62i is formed so as to be shorter than a distance Z between the flange 45b of the second outflow pipe 45 and the tip end portion 46a of the pipe 46. Further, a first annular projection 62e and a second annular projection having outer diameters and thicknesses substantially the same as the flange 45b of the second outflow pipe 45 and the flange of the pipe 46 are respectively provided at the right end and the left end of the large diameter portion 62a. A protrusion 62f is provided, and an annular recess 62g is formed between the first and second annular protrusions 62e and 62f.

  The method of connecting and removing the second outflow pipe 45 and the pipe 46 is the same as that of the first connection structure 41 shown in FIG. That is, when connecting, as shown in FIG. 21 (b), the connecting joint 62 is moved rightward, and the distal end portion 45 a of the second outflow pipe 45 is inserted into the cylindrical hole 62 b of the connecting joint 62. When removing, as shown in FIG. 21 (c), the connecting joint 62 is moved in the left direction, and the large-diameter portion 62 a of the connecting joint 62 is extracted from the distal end portion 45 a of the second outflow pipe 45.

  In the connection joint 62, in order to realize the removing method of FIG. 21 (c), as shown in FIG. 22, the length that allows the distal end portion 45a of the second outflow pipe 45 to be inserted (the length of the distal end portion 45a). ) Is “m”, and the distance from the right end of the pipe 46 to the left end of the second annular protrusion 62f (the length of the gap 63) is “M”. The sum of the length L3 of the portion 62a is the distance Z between the flange 45b of the second outflow pipe 45 and the tip portion 46a of the pipe 46 (sum of the length L3 of the large diameter portion 62a and the length M of the gap 63). What is necessary is as follows (m + L3 ≦ Z (in other words, L3 ≦ Z−m)). However, the depth D1 of the cylindrical hole 62b needs to be equal to or longer than a length that allows the distal end portion 45a of the second outflow pipe 45 to be inserted.

  Further, as shown in FIG. 23, in order to move the connecting joint 62 in the right direction so that the small diameter portion 62 c of the connecting joint 62 can be pulled out from the pipe 46, a length (small diameter portion) in which the small diameter portion 62 c can be inserted. 62c length) n may be a distance from the left end of the flange 45b of the outflow pipe 45 to the right end of the first annular protrusion 62e (the length of the gap 64) N or less (n ≦ N). The sum of the large diameter portion 62a and the length L3 (that is, the length of the connecting joint) may be equal to or less than the interval Z (the sum of the length L3 of the large diameter portion 62a and the length N of the gap 64) (n + L3). ≦ Z (in other words, L3 ≦ Z−n)). However, the width D2 between the bottom surface of the cylindrical hole 62b and the left end of the pipe 45 needs to be not less than the distance N.

  Furthermore, in order to allow the large diameter portion 62a of the connection joint 62 to be extracted from the tip portion 45a of the second outflow pipe 45, the small diameter portion 62c of the connection joint 62 can be extracted from the pipe 46 as shown in FIG. A simple configuration may be adopted.

  In any of the structures shown in FIGS. 21 to 23, the basic concept is the same as that of the connection joint 52 of the first connection structure 41 (see FIGS. 17 to 19).

  In the first connection structure (FIGS. 15 to 20) of the fourth embodiment, as a connection joint when connecting a pipe having a female joint shape and a pipe having a male joint shape, It is shown that a male joint shape is formed at one end and a female joint shape is formed at the other end. However, this invention is not limited to this, You may form the male type | mold joint shape inserted in the inside of a pair of piping at the both ends of a connection joint.

  Further, in the second connection structure (FIGS. 15, 21 to 23) of the fourth embodiment, a male joint is provided at one end as a connection joint when connecting a pair of pipes having a male joint shape. A mold joint shape was formed, and a female joint shape was formed. However, as a connection joint in the case of connecting a pair of pipes having a male joint shape, it may have a male joint shape inserted into the inside of the pair of pipes at both ends thereof.

  Next, a fifth embodiment of the connection joint and the like according to the present invention will be described with reference to FIGS. In these drawings, the same or equivalent components as in FIGS. 1 to 23 are denoted by the same reference numerals, and the description thereof is omitted.

  In the connection structure 70 of the present embodiment, as shown in FIG. 24, the check valve 5 (see FIG. 1) provided in the second outflow pipe 117 of the switching valve 114 is omitted, and the connection joint 72 is inverted. A stop valve 71 is provided.

  The connection joint 72 is a male joint at both ends. As shown in FIG. 25, the connection joint 72 is roughly divided into a joint main body 72a, a cylindrical portion 72b partially inserted into the joint main body 72a, and a fluid flow. And a valve body 72d installed in the through hole 72c.

  The joint body 72a includes a large-diameter portion 72e, a first small-diameter portion 72f that extends downward from the lower surface of the large-diameter portion 72e, and substantially the same diameter as the inner diameter of the outflow pipe 113 of the flow control valve 111, and the large-diameter portion 72e. A second small diameter portion 72g extending upward from the upper surface and having substantially the same diameter as the inner diameter of the inflow pipe 115 of the switching valve 114 is provided, and the first small diameter portion 72f has an elastic member 72z provided at the tip of the valve body 72d. Is provided with a valve seat 72h.

  As shown in FIG. 24, the length L4 of the large diameter portion 72e in the axis 72s direction is formed to be shorter than the interval X between the flange 113a of the outflow pipe 113 and the flange 115a of the inflow pipe 115. Further, as shown in FIG. 25, at the upper end and the lower end of the large diameter portion 72e, a first annular protrusion 72i having substantially the same diameter as the outer diameter of the flange 113a of the outflow pipe 113 and a flange 115a of the inflow pipe 115, respectively. A second annular protrusion 72j having substantially the same diameter as the outer diameter is provided, and an annular recess 72k is formed between the first and second annular protrusions 72i, 72j.

  On the other hand, the cylindrical portion 72b is composed of a large-diameter portion 72m having substantially the same diameter as the inner diameter of the inflow pipe 115 and a small-diameter portion 72n having substantially the same diameter as the inner diameter of the joint body 72a. It is inserted and fixed by an appropriate method such as press fitting, laser welding, snap fit or the like. A valve body support portion 72p that supports the valve body 72d so as to be slidable in the axial direction is integrally formed on the inner wall at the lower end of the cylindrical portion 72b. Between the valve body support portion 72p and the valve body 72d, the valve body A spring 72q for biasing 72d toward the valve seat 72h is attached.

  In the connection joint 72, when the valve body 72d rises, the valve port 72r is opened, and the fluid flows in the direction of arrow D (see FIG. 24) (from the outflow pipe 113 of the flow rate adjustment valve 111 into the connection joint 72). When the valve body 72d is lowered, the valve port 72r is closed to shut off the fluid flow in the direction opposite to the arrow D (the fluid flow flowing out from the connection joint 72 to the outflow pipe 113). To do.

  Next, operation | movement and the usage method of the connection coupling 72 which has the said structure are demonstrated, referring FIGS. 24-26. The connection method between the outflow pipe 113 and the inflow pipe 115 is the same as that in FIG.

  In the connection state shown in FIG. 24, when the fluid supply to the flow rate adjusting valve 111 and the switching valve 114 is started, the connection joint is caused by the fluid from the outflow pipe 113 of the flow rate adjustment valve 111 to the inflow pipe 115 of the switching valve 114. The valve body 72d (see FIG. 25) in 72 is pushed up, the valve port 72r is opened, and the flow of fluid is allowed.

  When removing the flow rate adjusting valve 111, first, the fluid supply to the flow rate adjusting valve 111 and the switching valve 114 is stopped, and the flow of the fluid in the direction of arrow D in the connection joint 72 is stopped. As a result, the valve body 72d (see FIG. 25) is lowered by the fluid pressure on the switching valve 114 side, the valve port 72r is closed, and the fluid flow in the direction opposite to the arrow D is blocked.

  Next, the quick fastener 23 is pulled out, and the fixed state of the outflow pipe 113, the connection joint 72, and the inflow pipe 115 is released. Next, as shown in FIG. 26, the connection joint 72 is raised by the gap 73 (see FIG. 25) between the large diameter portion 72 e of the connection joint 72 and the inflow pipe 115, and the connection joint 72 is discharged from the outflow pipe 113. The first small diameter portion 72f is pulled out. At this time, since the flow of the fluid in the direction opposite to the arrow D is blocked by the check valve 71, the fluid does not flow backward and does not leak from the lower end of the connection joint 72. Further, as described in the example of FIG. 1, it is not necessary to previously shut off the flow path of the discharge pipe 116 or 117 by adjusting the valve angle of the switching valve 114.

  Then, the 1st quick fastener 3 shown to Fig.3 (a) is engage | inserted in the junction part of the inflow pipe 115 and the large diameter part 72e of the connection coupling 72. FIG. Thereby, the connection joint 72 is fixed to the inflow pipe 115 so that the connection joint 72 does not fall. Finally, if the connection of the flow rate adjustment valve 111 on the inflow pipe side is released, the flow rate adjustment valve 111 can be pulled out to the left side of the page and removed.

  As described above, according to the present embodiment, since the check valve 71 is provided in the connection joint 72, it is possible to prevent fluid leakage when removing the flow rate adjustment valve 111, and to further improve workability. It becomes possible.

  In this example, since both the outflow pipes 116 and 117 are connected to the respective pipes by the connection joint 2, if the connection joint 2 is pulled out by the above-described method, the pipes and the flow rate adjusting valves are thereafter used. Without moving 111, the switching valve 114 can be pulled out in any direction perpendicular to the axis of the outflow pipes 116, 117.

  In the above embodiment, the check valve 71 is provided at the lower end of the connection joint 72. However, it is sufficient to prevent the fluid from flowing downward from the connection joint 72. A check valve 71 may be provided at a position other than the lower end portion such as the upper portion.

  Moreover, in the said embodiment, although the case where a non-return valve was provided in the inside of the connection coupling which connects female type pipes was illustrated, the connection coupling which connects female type piping and male type piping, and male Also in the connection joint that connects the pipes of the mold, a check valve can be provided inside.

  Next, a sixth embodiment of the connection joint and the like according to the present invention will be described with reference to FIGS. In these drawings, the same or equivalent components as in FIGS. 1 to 26 are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 27 shows a connection structure 80 of the present embodiment, and this connection structure 80 has a fluid leakage prevention function by a check valve, as in the case of the connection structure 70 of the fifth embodiment. In FIG. 27, the connection joint between the inflow pipe 115 and the outflow pipe 113 is the same as the connection joint 2 shown in FIGS. 1 to 14, but is installed in an upside down state.

  The connection structure 80 allows the flow of fluid in the direction of arrow F (flow of fluid flowing into the inflow pipe 115 from the connection joint 2), and the flow of fluid in the direction opposite to that of the arrow F (from the inflow pipe 115 to the connection joint 2). An inflow pipe 115 is provided with a valve body (check valve body) 81 that shuts off the flow of fluid flowing out). The valve body 81 is formed of, for example, a synthetic resin, and as illustrated in FIG. 28, a disc portion 81a, a stopper 81b that is disposed on the upper surface of the disc portion 81a and is formed in an L shape in a side view, The rod-shaped guide leg 81c is disposed on the lower surface 81e of the disc portion 81a and extends into the through hole 2d of the connection joint 2.

  A chamfered portion 81d having an inclination angle substantially similar to the inclination angle of the chamfered portion 2h of the second small-diameter portion 2c of the connection joint 2 is formed on the periphery of the lower surface of the disc portion 81a, and the lower surface 81e of the disc portion 81a. Is formed substantially the same as the inner diameter of the second small diameter portion 2c. And the some guide leg 81c is arrange | positioned at the peripheral edge part of the lower surface 81e, and is formed so that a slide on the inner wall of the 2nd small diameter part 2c is possible. Moreover, the stopper 81b is provided with a protrusion extending outward at each upper end, and this protrusion can slide on the inner wall of the inflow pipe 115.

  The diameter of the part other than the lower surface 81e of the disk part 81a (the part from the upper surface of the disk part 81a to the upper end of the chamfered part 81d) is larger than the inner diameter of the second small diameter part 2c, and the inflow of the switching valve 114 It is formed smaller than the inner diameter of the tube 115.

  Next, the operation and method of use of the connection structure 80 having the above configuration will be described with reference to FIGS. The connection method between the outflow pipe 113 and the inflow pipe 115 is the same as that in FIG.

  In the connected state shown in FIG. 27, when the fluid supply to the flow rate adjusting valve 111 and the switching valve 114 is started, the valve body 81 is pushed up by the fluid from the outflow pipe 113 to the inflow pipe 115, To rise. As a result, as shown in FIG. 28, the chamfered portion 81d of the disc portion 81a is separated from the second small diameter portion 2c of the connection joint 2, and the fluid sequentially flows into the second small diameter portion 2c, the inflow pipe 115 and the disc. It flows to the rotary valve 120 in the gap between the part 81a and the switching valve 114, and the flow in the arrow F direction is allowed.

  At this time, when the valve body 81 rises to the vicinity of the rotary valve 120 that is the valve body of the switching valve 114, the stopper 81b comes into contact with the lower surface of the rotary valve 120, and the upper surface of the disc portion 81a and the lower surface of the rotary valve 120 The valve body 81 stops with a gap provided therebetween. For this reason, the lower opening 120a of the rotary valve 120 is not blocked by the disc portion 81a.

  The rotary valve 120 selectively allows the fluid flowing in from the inflow pipe 115 to flow out to either the first or second outflow pipe 116 or 117. For example, as shown in Patent Document 2 described above. The bottomed cylindrical body has an opening on the inflow pipe 115 side, and an opening serving as an outflow hole is formed on the side surface thereof.

  When removing the flow rate adjusting valve 111, first, the fluid supply to the flow rate adjusting valve 111 and the switching valve 114 is stopped, and the flow of the fluid in the direction of arrow F in the inflow pipe 115 is stopped. As a result, the valve body 81 descends due to the fluid pressure on the switching valve 114 side, and the chamfered portion 81d of the disc portion 81a (see FIG. 28) contacts the chamfered portion 2h of the second small diameter portion 2c of the connection joint 2. . Thereby, the opening of the 2nd small diameter part 2c is obstruct | occluded, and the flow of the fluid to the reverse direction to the arrow F is interrupted | blocked.

  Next, the quick fastener 23 (not shown) is pulled out, and the fixed state of the outflow pipe 113, the connection joint 2, and the inflow pipe 115 is released. Next, the connection joint 2 is raised by the gap 6 (see FIG. 27) between the large-diameter portion 2a of the connection joint 2 and the inflow pipe 115, and the first small-diameter portion 2b of the connection joint 2 is removed from the outflow pipe 113. Pull out (see FIG. 29). At this time, since the flow of the fluid in the direction opposite to the arrow F is blocked by the valve body 81, the fluid does not flow backward and does not leak from the lower end of the connection joint 2.

  Thus, also in the present embodiment, as in the case of the fifth embodiment, fluid leakage when removing the switching valve 114 and the flow rate adjusting valve 111 can be prevented, and workability can be further improved. It becomes possible.

  Further, since the end of the connection joint (the tip of the small diameter portion 2c) is used as the valve seat constituting the check valve, only the check valve body needs to be prepared as the check valve. The connection structure having the fluid leakage prevention function can be very simply configured.

  The valve body 81 can also be applied to a needle valve type switching valve, a flow rate adjusting valve, or the like. In this case, a stopper may be brought into contact with a component such as a lower portion of the valve seat. In the above embodiment, the valve body 81 is provided with the stopper 81b as a member for preventing the valve body 81 from entering or closing the rotary valve 120 of the switching valve 114. Instead of this, a protrusion-like stopper projecting inward may be formed in the pipe of the inflow pipe 115 of the switching valve 114, and the disc portion 81a or the stopper 81b of the valve body 81 may be brought into contact therewith.

  Moreover, in the said embodiment, although the case where the connecting joint 2 shown in FIGS. 1-14 was used and the valve body 81 was provided in the inflow pipe 115 was illustrated, in the 1st connection structure 41 shown in FIG. The valve body 81 can be provided in the first outflow pipe 43, and the valve body 81 can be provided in the second outflow pipe 45 in the second connection structure 42.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to those structures, A various change is possible within the range of the invention described in the claim.

  For example, in the above first to sixth embodiments, as an application example of the present invention, the flow regulating valve 111 and the switching valve 114 are connected and the structure for separating them is exemplified. In addition, it can be widely applied to other connection structures such as connecting water pipes to each other or connecting equipment such as a measuring instrument and piping.

  In the first to sixth embodiments, the first and second annular protrusions 2e, 2f, 52e, 52f are connected to the large-diameter portions 2a, 52a, 62a, 72e of the connection joints 2, 52, 62, 72. 62e, 62f, 72i, 72j, but these protrusions 2e-72j do not have to be a continuous ring, and a plurality of protrusions are intermittently provided along the peripheral surface of the connection joints 2-72. You may make it form in.

  Moreover, in the said 1st-6th embodiment, although the annular recessed parts 2g, 52g, 62g, 72k are provided in the large diameter parts 2a-72e of the connection joints 2-72, it is not necessary to necessarily provide an annular recessed part, A partial recess may be provided.

DESCRIPTION OF SYMBOLS 1 Connection structure 2 Connection joint 2a Large diameter part 2b 1st small diameter part 2c 2nd small diameter part 2d Through-hole 2e 1st annular protrusion 2f 2nd annular protrusion 2g Annular recessed part 2h Chamfer 2i Axis 3 of large diameter part 3rd 1 quick fastener 3a end ring part 3b handle part 3c guide piece 3d engagement hole 4 second quick fastener 4a end ring part 4b handle part 4c guide piece 4d engagement hole 5 check valve 5a valve body 5b Spring 5c Valve seat 5d Valve port 5e Elastic member 6 Gap 7, 8, 9 Pipe 10 Gap 20 Connection structure 23 Quick fastener 23a, 23b Ended ring part 23c, 23d Handle part 23e, 23f Guide piece 23g, 23h Connection part 23i Holes 23j, 23k Engagement hole 24 Gap 30 Connection structure 32 Connection joint 32a Large diameter portion 40 Connection structure 41 First connection structure 42 Second connection structure 43 First outlet pipe 43b Flange 44 Pipe 44a Tip 44 b Flange 45 Second outlet pipe 45a Tip 45b Flange 46 Pipe 46a Tip 52 Connection joint 52a Large diameter portion 52b Cylindrical hole 52c Small diameter portion 52d Through hole 52e First annular projection 52f Second annular projection 52g Annular recess 52i Large Diameter axis 53, 54 Gap 62 Connection joint 62a Large diameter part 62b Cylindrical hole 62c Small diameter part 62d Through hole 62e First annular projection 62f Second annular projection 62g Annular recess 62i Large diameter axis 63, 64 Gap 70 Connection structure 71 Check valve 72 Connection joint 72a Joint body 72b Cylindrical part 72c Through hole 72d Valve body 72e Large diameter part 72f First small diameter part 72g Second small diameter part 72h Valve seat 72i First annular protrusion 72j Second annular protrusion Part 72k annular recess 72m large diameter part 72n small diameter part 72p valve body support part 72q spring 72r valve port 72s axis 72z of large diameter part of joint body Sex member 73 gap 80 connecting structure 81 valve (check valve body)
81a disc part 81b stopper 81c guide leg 81d chamfering part 81e bottom face 111 of disc part flow control valve 113 outflow pipe 113a flange 114 switching valve 115 inflow pipe 115a flange 120 rotary valve 120a lower opening 125 O-ring

Claims (16)

A connecting joint for opposingly arranging the first and second pipe portions having flanges and connecting them in a state where a predetermined interval is provided,
A large-diameter portion having an outer diameter substantially the same as the flange and having a width narrower than the predetermined interval;
A first end portion configured to be freely fitted to an inner periphery or an outer periphery of the first pipe portion;
A second end portion configured to be freely fitted to an inner periphery or an outer periphery of the second pipe portion;
A connection joint comprising a through hole communicating with the first and second pipe portions.   The first and second end portions are fitted to at least one of the first and second pipe portions in a state where the first and second end portions are fitted to the inner circumference or the outer circumference of the first and second pipe portions, respectively. The fitting depth of one of the first and second end portions is equal to or less than a distance between the large diameter portion and the other of the first and second pipe portions with which the large diameter portion abuts. The connection joint according to 1.   The first and second end portions are fitted to the inner and outer circumferences of the first and second tube portions, respectively, and the large diameter portion is in contact with one of the first and second tube portions. In the first and second pipe portions, one of the first and second end portions is fitted to the first and second large-diameter portions. The connection joint according to claim 1, wherein the connection joint is equal to or shorter than the distance to the other of the second pipe portions.   The connection joint according to claim 3, wherein the contact is contact between the large diameter portion and one flange of the first and second pipe portions. A connecting joint for connecting the first and second pipe portions in a state where a female first and second pipe portions having flanges at the end portions are arranged to face each other and a predetermined interval is provided between the flanges. There,
A large diameter portion having an outer diameter larger than the inner diameter of the first and second tube portions;
A first small-diameter portion extending from the large-diameter portion toward the first tube portion and configured to be freely inserted into the first tube portion;
A second small-diameter portion extending from the large-diameter portion toward the second tube portion and configured to be freely inserted into the second tube portion;
A through hole penetrating the first small diameter portion, the large diameter portion and the second small diameter portion,
The axial length of the large diameter portion is shorter than the predetermined interval,
The sum of the length in which the first small diameter portion can be inserted into the first tube portion and the length in the axial direction of the large diameter portion is equal to or less than the predetermined interval, and / or the second small diameter portion is defined as the second tube. The sum of the length that can be inserted into the portion and the length in the axial direction of the large-diameter portion is equal to or less than the predetermined interval. A state in which a female first pipe portion having a flange at an end portion and a male second pipe portion having a flange at a position spaced from the tip portion are arranged to face each other, and a predetermined interval is provided between the flanges. A connecting joint for connecting the first and second pipe parts,
A large diameter portion having an outer diameter larger than the inner diameter of the first and second tube portions;
A small-diameter portion extending from the large-diameter portion toward the first tube portion and configured to be freely inserted into the first tube portion;
A columnar hole formed inside the large-diameter portion and configured to be freely insertable at a distal end portion of the second pipe portion;
A through-hole penetrating the small-diameter portion and the large-diameter portion and communicating with the columnar hole;
The axial length of the large diameter portion is shorter than the predetermined interval,
The sum of the length that allows the distal end portion of the second tube portion to be inserted into the columnar hole and the axial length of the large diameter portion is equal to or less than the predetermined interval, and / or the small diameter portion is defined as the first tube portion. A connection joint, characterized in that the sum of the length that can be inserted into the shaft and the length in the axial direction of the large diameter portion is equal to or less than the predetermined interval. Male first and second pipe parts having flanges are arranged opposite to each other at a position spaced from the tip part, and a predetermined interval is provided between the flange of the first pipe part and the tip part of the second pipe part. A connecting joint for connecting the first and second pipe portions in a state of being connected,
A large diameter portion having an outer diameter larger than the inner diameter of the first and second tube portions;
A columnar hole formed inside the large-diameter portion and configured to be freely insertable at the tip of the first tube portion;
A small-diameter portion extending from the large-diameter portion toward the second tube portion and configured to be freely inserted into the second tube portion;
A through-hole penetrating the small-diameter portion and the large-diameter portion and communicating with the columnar hole;
The axial length of the large diameter portion is shorter than the predetermined interval,
The sum of the length that allows the distal end portion of the first tube portion to be inserted into the columnar hole and the axial length of the large diameter portion is equal to or less than the predetermined interval, and / or the small diameter portion is defined as the second tube portion. A connection joint, characterized in that the sum of the length that can be inserted into the shaft and the length in the axial direction of the large diameter portion is equal to or less than the predetermined interval.   The connection joint according to any one of claims 1 to 7, wherein the large-diameter portion includes a concave portion at the center thereof so that protruding portions are formed at both ends thereof. When fluid is circulated from the first pipe part toward the second pipe part with the first and second pipe parts connected,
A check valve that allows a flow of fluid flowing into the connection joint from the first pipe portion and blocks a flow of fluid flowing out of the connection joint to the first pipe portion is provided in the through-hole. The connection joint according to claim 1, wherein the connection joint is characterized in that: A connection structure for connecting the first and second pipe portions having a flange,
The connection joint according to any one of claims 1 to 9, fitted on both end faces of the first and second pipe portions,
The connection structure which consists of a detachable fastener which connects the large diameter part of the said connection joint, and the said 1st and 2nd pipe part. A connection structure for connecting the first and second pipe portions having a flange,
The connection joint according to any one of claims 1 to 8, fitted on both end faces of the first and second pipe portions,
A detachable fastener that connects the large-diameter portion of the connection joint and the first and second pipe portions;
When fluid is circulated from the first pipe part toward the second pipe part in a state where the first and second pipe parts are connected, the flow of fluid flowing from the connection joint into the second pipe part is reduced. A check valve body for allowing and blocking a flow of fluid flowing out from the second pipe portion to the connection joint,
The connection structure characterized in that the check valve body is provided in the second pipe portion and contacts and separates from an end portion of the connection joint. The check valve body is
A disc portion for opening and closing the opening of the through hole of the connection joint;
The connection structure according to claim 11, further comprising a guide leg that extends from the disc portion into the through hole of the connection joint and slides on a wall surface of the through hole.   The connection structure according to claim 11 or 12, wherein the check valve body is capable of abutting on a member in the second pipe portion that is located on the opposite side of the end portion of the connection joint.   The connection structure according to claim 13, wherein the member in the second pipe portion is a rotary valve of a valve device.   The connection structure according to any one of claims 10 to 14, wherein the fastener is a ring-shaped elastic connector having a ring-shaped end having an engagement hole.   The elastic connector includes a plurality of end ring portions that are arranged in parallel at predetermined intervals, each having an insertion hole, and a connecting portion that connects the plurality of end ring portions. The connection structure according to claim 15.

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