JP2017048830A - Pipeline connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipeline connection device capable of connecting one pipeline at the tip of which a groove is formed, to another pipeline at the tip of which a flange is provided.SOLUTION: A pipeline connection device includes: a first connection member 2 in which a flow passage 20 is formed; a second connection member 3 comprising two half-split members 15, 16; and a fastener 22 configured to fasten a flange 4 and the first connection member 2 and further fasten the first connection member 2 and the second connection member 3. The first connection member 2 has an annular recess part 7 storing a groove 1a, and the second connection member 3 has an engagement part 3b configured to engage with a projection part 1b projecting outward from an outer peripheral surface of one pipeline 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe connection device for connecting one pipe to the other pipe, and in particular, a pipe for connecting one pipe having a groove at the tip to the other pipe having a flange at the tip. It relates to the connection device.

  Conventionally, a pump is used to transfer a liquid (for example, water). The pump has a pump casing that houses the impeller, and a suction pipe and a discharge pipe protrude from the pump casing. The liquid sucked into the pump casing from the suction pipe is pressurized by the impeller rotating in the pump casing and discharged from the discharge pipe.

  The suction pipe is connected to a suction side connection pipe that supplies liquid to the pump, and the discharge pipe is connected to a discharge side connection pipe into which the liquid discharged from the pump flows. Normally, flanges are provided at the front end of the suction pipe and the front end of the suction side connection pipe, and the suction pipe is connected to the suction side connection pipe by fastening these flanges. Similarly, flanges are respectively provided at the distal end of the discharge pipe and the distal end of the discharge side connection pipe, and the discharge pipe is connected to the discharge side connection pipe by fastening these flanges. In this specification, a structure in which one pipe is connected to the other pipe by fastening two flanges to each other is referred to as “flange connection”.

Japanese Patent No. 3856923

  However, depending on the customer, there is no flange on the suction side connection pipe and / or the discharge side connection pipe, and it is necessary to connect the suction pipe and the suction side connection pipe and / or the discharge pipe and the discharge side connection pipe by welding. May be. In this case, a welding groove is formed instead of the flange at the tip of the suction pipe and / or the tip of the discharge pipe. In this specification, a structure in which one pipe is connected to the other pipe by welding is referred to as “flangeless connection”.

  In this way, there are two types of pipe connection structures, “flange connection” and “flangeless connection”, so that the pump manufacturer can use the flange connection type to flexibly meet customer requirements. Two types of suction pipes for flangeless connection and two types of discharge pipes for flange connection and flangeless connection need to be prepared in advance, resulting in a problem that inventory management becomes complicated.

  This problem can occur not only in the suction pipe and discharge pipe of the pump, but also in all pipe connection structures that connect one pipe to the other pipe. Therefore, there has been a demand for a technique capable of connecting a flangeless connection pipe having a groove formed at the tip to a flange connection pipe having a flange at the tip.

  The present invention has been made in view of the above circumstances, and provides a pipe connection device capable of connecting one pipe having a groove at the tip to the other pipe having a flange at the tip. Objective.

  One aspect of the present invention for solving the above-described problem is a pipe connection device for connecting one pipe having a groove formed at a tip thereof to the other pipe having a flange at the tip. The first connecting member formed with the second connecting member, the second connecting member composed of two half members, the flange and the first connecting member are fastened, and the first connecting member and the second connecting member And the first connecting member has an annular recess that accommodates the groove, and the second connecting member projects outward from the outer peripheral surface of the one pipe. A pipe connecting device having an engaging portion that engages with a protruding portion.

A preferable aspect of the present invention further includes an annular seal groove formed on an inner peripheral side wall surface of the annular recess, and an annular seal member disposed in the seal groove, and the one pipe is provided by the annular seal member. A gap between the inner peripheral surface of the annular recess and the inner peripheral side wall surface of the annular recess is sealed.
In a preferred aspect of the present invention, the tip of the groove accommodated in the annular recess is separated from the bottom surface of the annular recess.

In a preferred aspect of the present invention, the fastener includes a bolt that penetrates the flange, the first connecting member, and the second connecting member, and a nut that engages with the bolt.
In a preferred aspect of the present invention, the fastener includes a screw that penetrates the flange and the first connecting member, and a screw hole formed in the second connecting member.

  If the customer's piping has no flange and requires flangeless connection, that is, connection by welding, one piping in which a groove for welding is formed without using the piping connection device according to the present invention What is necessary is just to connect (for example, discharge piping of a pump) to customer's piping by welding. When the customer's piping requires flange connection, the pipe connecting device according to the present invention is used, and the first connecting member and the second connecting member attached to one of the pipes (for example, the discharge pipe of the pump) The other pipe (for example, customer's pipe) is fastened with a fastener. As described above, since the pipe connection device according to the present invention can eliminate the need for stocking the flange connection pipe, inventory management is facilitated.

It is sectional drawing which shows the piping connection apparatus which concerns on one Embodiment of this invention. 2A is a sectional view of the first connecting member shown in FIG. 1, and FIG. 2B is a bottom view of the first connecting member shown in FIG. 3A is a top view of the second connecting member shown in FIG. 1, and FIG. 3B is a cross-sectional view of the second connecting member shown in FIG. 3A. It is sectional drawing which shows the state by which the discharge piping in which the groove | channel was formed in the front-end | tip was welded to the discharge side connection piping for flangeless connection. It is sectional drawing which shows the piping connection apparatus which concerns on other embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a pipe connection device according to an embodiment of the present invention. In FIG. 1, a pipe connection device for connecting a discharge pipe (one pipe) 1 of a pump having a groove 1a at the tip to a discharge side connection pipe (the other pipe) 11 having a flange 4 at the tip. An example is shown.

  As shown in FIG. 1, a groove 1 a is formed at the tip of the discharge pipe 1 fixed to the pump casing 12. Further, the discharge pipe 1 is provided with a protruding portion 1b that protrudes outward from the outer peripheral surface of the discharge pipe 1. The protrusion 1b is formed integrally with the discharge pipe 1 and has an annular shape. That is, the protrusion 1 b extends over the entire circumference of the outer peripheral surface of the discharge pipe 1.

  2A is a cross-sectional view of the first connecting member 2 shown in FIG. 1, and FIG. 2B is a bottom view of the first connecting member 2 shown in FIG. 2A. As shown in FIGS. 2 (a) and 2 (b), the first connecting member 2 of the present embodiment has a disk shape with a flow path 20 formed in the center thereof. An annular recess 7 is formed in the first connecting member 2, and the groove 1a of the discharge pipe 1 is accommodated in the annular recess 7 (see FIG. 1). The annular recess 7 is formed on the lower surface of the first connecting member 2 and extends in the circumferential direction of the first connecting member 2. When the groove 1 a is accommodated in the annular recess 7, the inner peripheral side wall surface 7 a of the annular recess 7 comes into contact with the inner peripheral surface of the distal end portion of the discharge pipe 1.

  As shown in FIG. 1, the inner peripheral surface 2 a of the first connecting member 2 constitutes a flow path 20 that communicates with the discharge pipe 1. The flow path 20 also communicates with the discharge side connection pipe 11. The liquid (for example, water) discharged from the pump casing 12 flows through the discharge pipe 1, the flow path 20, and the discharge side connection pipe 11 in this order.

  An annular seal groove 10 is formed on the inner peripheral side wall surface 7 a of the annular recess 7, and the annular seal member 9 is disposed in the seal groove 10. The annular seal member 9 seals the gap between the inner peripheral surface of the discharge pipe 1 and the inner peripheral side wall surface 7 a of the annular recess 7. The annular seal member 9 of this embodiment is an O-ring. The annular seal member 9 prevents liquid (for example, water) flowing through the discharge pipe 1 from leaking from the gap between the inner peripheral surface of the discharge pipe 1 and the inner peripheral side wall surface 7a of the annular recess 7.

  A plurality of first through holes 8 (see FIG. 1) are formed in the flange 4 provided at the tip of the discharge side pipe 11. A plurality of second through holes 18 are formed in the first connecting member 2 at positions corresponding to the first through holes 8. As shown in FIG. 1, a bolt 23 is inserted into the first through hole 8 formed in the flange 4 and the second through hole 18 formed in the first connecting member 2.

  As shown in FIG. 1, the lower surface of the first connecting member 2 located outside the annular recess 7 is in contact with the upper surface of the protruding portion 1b. In this state, the tip of the groove 1 a accommodated in the annular recess 7 is separated from the bottom surface 7 c of the annular recess 7. Thus, the groove 1 a is protected by accommodating the groove 1 a in the annular recess 7 in a state where the tip of the groove 1 a is separated from the bottom surface 7 c of the annular recess 7. That is, the groove 1a is prevented from being damaged, and deformation or breakage of the groove 1a is prevented.

  FIG. 3A is a top view of the second connecting member 3 shown in FIG. 1, and FIG. 3B is a cross-sectional view of the second connecting member 3 shown in FIG. As shown in FIGS. 3A and 3B, the second connecting member 3 has a split structure. That is, the second connecting member 3 includes two halved members 15 and 16. FIG. 3A and FIG. 3B show a state where the two halved members 15 and 16 are separated. The two half members 15 and 16 of this embodiment have a half ring shape, and when the half members 15 and 16 are combined, the second connecting member 3 has a ring shape.

  The half member 15 has a protrusion 15b that protrudes radially inward from the inner peripheral surface 15a. The protrusion 15b extends from one end to the other end along the circumferential direction of the half member 15. Extend to. Similarly, the half member 16 has a protrusion 16b that protrudes radially inward from the inner peripheral surface 16a, and the protrusion 16b extends from one end to the other along the circumferential direction of the half member 16. Extends to the end of the. When the second connecting member 3 is configured by combining the half member 15 and the half member 16, the projecting portion 15 b and the projecting portion 16 b are engaged with the projecting portion 1 b of the discharge pipe 1. Configure. The engaging portion 3 b protrudes radially inward from the inner peripheral surface 3 a of the second connecting member 3 constituted by the inner peripheral surface 15 a of the half member 15 and the inner peripheral surface 16 a of the half member 16.

  As shown in FIG. 1, when the engaging portion 3 b of the second connecting member 3 is engaged with the protruding portion 1 b of the discharge pipe 1, the lower surface of the protruding portion 1 b of the discharge pipe 1 is the second connecting member 3. It contacts the upper surface of the engaging portion 3b. Furthermore, the outer peripheral surface of the protrusion 1 b of the discharge pipe 1 is in contact with the inner peripheral surface 3 a of the second connecting member 3, and the upper surface of the second connecting member 3 is in contact with the lower surface of the first connecting member 2. Accordingly, the protruding portion 1b of the discharge pipe 1 is accommodated in a space surrounded by the lower surface of the first connecting member 2, the inner peripheral surface 3a of the second connecting member 3, and the upper surface of the engaging portion 3b of the second connecting member 3. Is done.

  A plurality of third through holes 28 are formed at positions corresponding to the plurality of first through holes 8 formed in the flange 4 in the second connecting member 3, which is an assembly of two halved members 15 and 16. ing. Since the second through hole 18 formed in the first connecting member 2 is located at a position corresponding to the first through hole 8 formed in the flange 4 of the discharge side pipe 11, the bolt 23 is connected to the first through hole 8, The second through hole 18 and the third through hole 28 can be inserted.

  As shown in FIG. 1, a sheet packing 17 is disposed between the first connecting member 2 and the flange 4. A plurality of fourth through holes 29 are formed in the seat packing 17 at positions corresponding to the plurality of first through holes 8 formed in the flange 4, and the bolts 23 are inserted into the fourth through holes 29. Can be done. The sheet packing 17 prevents liquid from leaking from the gap between the upper surface of the first connecting member 2 and the lower surface of the flange 4.

  Furthermore, as FIG. 1 shows, the piping connection apparatus has the fastener 22 which fastens the flange 4 and the 1st connection member 2, and also fastens the 1st connection member 2 and the 2nd connection member 3. As shown in FIG. The fastener 22 of the present embodiment includes a bolt 23 that penetrates the flange 4, the first connecting member 2, and the second connecting member 3, and a nut 24 that engages with the bolt 23. The bolt 23 passes through the first through hole 8 of the flange 4, the fourth through hole 29 of the seat packing 17, the second through hole 18 of the first connecting member 2, and the third through hole 28 of the second connecting member 3. The nut 24 is engaged with the tip of the bolt 23. As shown in FIG. 1, a washer 25 may be disposed between the lower surface of the second connecting member 3 and the nut 24.

  When assembling the pipe connection device shown in FIG. 1, first, the first connecting member 2 is connected to the discharge pipe 1 so that the groove 1 a of the discharge pipe 1 is accommodated in the annular recess 7 of the first connecting member 2. Move towards. The 1st connection member 2 is moved until this 1st connection member 2 contacts the protrusion part 1b. Next, the second connecting member 3 is formed by combining the half members 15 and 16 so as to sandwich the outer peripheral surface of the discharge pipe 1.

  The sheet packing 17 is disposed between the first connecting member 2 and the flange 4 of the discharge-side connecting pipe 11, and the fourth through hole 29 of the sheet packing 17, the second through hole 18 of the first connecting member 2, and the first The third through holes 28 of the two connecting members 3 are aligned with the first through holes 8 of the flange 4. Next, the bolt 23 is inserted into the first through hole 8, the fourth through hole 29, the second through hole 18, and the third through hole 28, and the nut 24 is engaged with the bolt 23. When the first connecting member 2 is disposed between the flange 4 and the second connecting member 3, the nut 24 is fastened to the bolt 23, whereby the flange 4 and the first connecting member 2 are fastened. The connecting member 2 and the second connecting member 3 are fastened. The engaging portion 3 b of the second connecting member 3 is pressed against the protruding portion 1 b of the discharge pipe 1 by the fastening force of the nut 24, and the first connecting member 2 and the seat packing 17 are connected to the flange 4, the second connecting member 3, and the like. It is sandwiched between.

  As described above, the pipe connection device of the present embodiment includes the first connection member 2 in which the flow path 20 is formed, the second connection member 3 including the two halved members 15 and 16, and the first connection. And a fastener 22 for fastening the member 2, the second connecting member 3, and the flange 4. The first connecting member 2 has an annular recess 7 that accommodates the groove 1 a, and the second connecting member 3 has an engaging portion 3 b that engages with a protruding portion that protrudes outward from the outer peripheral surface of the discharge pipe 1. . According to this pipe connecting device, the first connecting member 2 that accommodates the groove 1a in the annular recess 7 and the second connecting member 3 that engages with the protruding portion 1b provided on the discharge pipe 1 by the engaging portion 3b. The fastener 22 is fastened to the flange 4 of the discharge side connection pipe 11. As a result, the discharge pipe 1 with the groove 1a formed at the tip can be connected to the discharge side connection pipe 11 having the flange 4 at the tip.

  If the pipe to be connected does not have a flange and a flangeless connection, that is, a connection by welding, is required, the discharge pipe 1 in which the groove 1a is formed is used as the pipe without using the pipe connection device described above. What is necessary is just to connect by welding.

  FIG. 4 is a cross-sectional view showing a state in which the discharge pipe 1 having the groove 1a formed at the tip is welded to the discharge-side connection pipe 30 for flangeless connection. In the flangeless connection, that is, the connection by welding, the above-described pipe connection device is not used, and the groove 30a formed at the tip of the discharge-side connection pipe 30 and the groove 1a of the discharge pipe 1 are butted to perform welding. To do. The discharge pipe 1 is connected to the discharge side connection pipe 30 via the welded portion 13.

  According to the pipe connecting apparatus described with reference to FIGS. 1 to 3, the flange-less connecting discharge pipe 1 having the groove 1a formed at the tip is connected to the flange connecting discharge side having the flange 4 at the tip. Connection pipe 11 can be connected. Therefore, the manufacturer of the pump only needs to prepare a discharge pipe for flangeless connection as the discharge pipe. As a result, the stock management of the discharge pipe is facilitated.

  FIG. 5 is a cross-sectional view showing a pipe connection device according to another embodiment. As shown in FIG. 5, the fastener 22 of the present embodiment is provided with a screw 26 penetrating the first connecting member 2 and the flange 4 and the second connecting member 3 instead of the bolt 23 and the nut 24 described above. And the formed screw hole 3c.

  As shown in FIG. 5, the screw 26 includes a first through hole 8 formed in the flange 4 of the discharge side connection pipe 11, a fourth through hole 29 in the sheet packing 17, and a second through hole in the first connecting member 2. It extends through the hole 18. A screw hole 3c is formed on the upper surface of the second connecting member 3, and the first connecting member 2, the second connecting member 3, and the flange 4 are formed by screwing the tip of the screw 26 into the screw hole 3c. Is concluded.

  The pipe connection device according to the above-described embodiment may be used for a pump that is tested in a factory. Prior to shipping the pump, the pump is test run at the factory to determine whether the performance required by the customer is satisfied. When the connection structure of the discharge pipe designated by the customer is flangeless connection, a groove is formed at the tip of the discharge pipe. On the other hand, since the flange is attached to the tip of the discharge side connection pipe arranged in the factory, the discharge pipe for flangeless connection cannot be connected to the discharge side connection pipe in the factory as it is.

  If the pipe connection device described above is used, the discharge pipe 1 having the groove 1a formed at the tip can be connected to the discharge side connection pipe in the factory. Furthermore, since the groove 1a is accommodated and protected in the annular recess 7 during the test operation, the pump can be delivered to the customer without damaging the groove 1a.

  Up to now, the pipe connection device has been described by taking the discharge pipe of the pump as an example, but the above-described pipe connection device can also be applied to the suction pipe of the pump. Furthermore, the pipe connection device described above can be applied to all pipe connection structures that connect one pipe having a groove formed at the tip to the other pipe having a flange at the tip.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in the widest scope according to the technical idea defined by the claims.

1 Discharge piping (one piping)
DESCRIPTION OF SYMBOLS 1a Groove 1b Protrusion part 2 1st connection member 3 2nd connection member 4 Flange 7 Annular recessed part 8 1st through-hole 9 Annular seal member 10 Seal groove 11 Discharge side connection piping (other piping)
12 Pump casing 13 Welded portion 15 Half member 16 Half member 18 Second through hole 20 Channel 22 Fastener 23 Bolt 24 Nut 25 Washer 26 Screw 28 Third through hole 29 Fourth through hole

Claims (5)

A pipe connection device for connecting one pipe having a groove formed at the tip to the other pipe having a flange at the tip,
A first connecting member in which a flow path is formed;
A second connecting member composed of two halved members;
A fastener for fastening the flange and the first connecting member, and further fastening the first connecting member and the second connecting member;
The first connecting member has an annular recess that houses the groove,
The second connecting member has an engaging portion that engages with a protruding portion that protrudes outward from an outer peripheral surface of the one pipe. An annular seal groove formed on the inner peripheral side wall surface of the annular recess;
An annular seal member disposed in the seal groove,
The pipe connection device according to claim 1, wherein a gap between an inner peripheral surface of the one pipe and an inner peripheral side wall surface of the annular recess is sealed by the annular seal member.   The pipe connection device according to claim 1, wherein a tip of the groove accommodated in the annular recess is separated from a bottom surface of the annular recess.   2. The pipe connection device according to claim 1, wherein the fastener includes a bolt that penetrates the flange, the first connecting member, and the second connecting member, and a nut that engages with the bolt. .   2. The pipe connection device according to claim 1, wherein the fastener includes a screw that penetrates the flange and the first connecting member, and a screw hole formed in the second connecting member.

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