JPH07119872A - Pipe connecting device - Google Patents

Abstract

PURPOSE:To provide a pipe connecting device to connect a pipe to a testing machine in the shop test run in the manufacturing, in which the bevel form for welding of the discharge pipe member of a pump has been processed and formed in the manufacturing process, and the pipe connecting device can be shipped as it is without applying any process after the test run. CONSTITUTION:This pipe connecting device is composed of a discharge pipe member 1 in which a bevel form 1a is formed at the front end, and a flange form projection 1b is formed on the intermediate peripheral surface; an adapter 2 in which a flange 2f formed at the inner diameter fitted to the outer diameter of the front end of the discharge pipe member 1, and overhung in the outer diameter direction is formed at one side end, while a pipe end coupling form 2c connecting to a test machine is formed at the other side end; and connecting members 3, 91, and 92 to connect the flange 2f of the adapter 2 and the flange form projection 1b of the discharge pipe member 1 by connecting through a seal member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a water supply pump or the like designed to connect the tip of the water supply pipe to a host system by welding, and tests the water discharge pump or the like at the time of factory trial operation. It relates to a pipe connecting means for connecting to a machine.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional pipe connecting means for connecting a discharge pipe of a feed pump for a high pressure boiler to a pump tester.
Discharge pipe member 1 integrally or welded to the pump body 7
In the completed state, the tip is formed as the welding groove 1a as shown by the chain line, and is connected to the plant by welding at the site. However, if the discharge port end is formed in the shape of the welding groove 1a in the manufacturing process, the discharge pipe member 1 cannot be connected to the pump tester during the factory trial run, and therefore, in the manufacturing process, the discharge pipe member 1 as shown in FIG. Longer than the finished state,
A pipe end joint shape 1c having the same shape as the pipe end joint shape 4d of the test machine pipe 4 is formed so that the tip end is connected by the test machine pipe joint 5, and the test machine pipe joint 5 is sheathed and fastened. Bolt 51
Then, the nut 52 is tightened and the tester is connected to the tester. After the test run is completed, this pump is carried into a machine factory, the discharge pipe member 1 is cut midway to form a welding groove 1a by machining, and then shipped as a finished product.

[0003]

The conventional pipe connecting means at the time of the trial run is as described above, but at the stage of the manufacturing process, the pipe end joint shape 1c is formed at the tip of the discharge pipe member 1 and the trial run is completed. After that, the water supply pump must be carried into the machine factory again, disassembled, the discharge pipe member 1 must be cut in the middle, the welding groove 1a must be formed by machining, and the assembly must be performed again. It takes time and effort to enter,
There is a possibility that quality defects such as foreign matter intrusion may occur after the completion of the test operation, and the number of processes increases, so that there is a problem that the chance of occurrence of defects increases.

The present invention has been made in order to solve the above problems, and is a pipe connecting device for connecting to a tester at the time of factory trial operation, wherein the welding groove shape of the discharge pipe member of the pump is used in the manufacturing process. It is an object of the present invention to obtain a pipe connecting device which has already been formed and can be shipped as it is without any processing after the trial operation.

[0005]

DISCLOSURE OF THE INVENTION A pipe connecting device according to the present invention is a discharge pipe of a pump in which a tip end portion of a circular pipe is formed into a welding groove shape and a collar-shaped convex portion is formed on an intermediate outer peripheral surface. Member, one end portion is formed with an inner diameter that fits the outer diameter of the circular pipe at the tip end portion of the discharge pipe member, and a flange portion that projects in the outer diameter direction is formed, and the other end portion is a pipe that is connected to a testing machine. An adapter having an end joint shape is formed, and a flange portion of the adapter and a flange-shaped protrusion of the discharge pipe member are fastened so as to connect the adapter and the discharge pipe member with a sealing material interposed therebetween. And a fastening member.

[0006]

A sealing material is interposed between the adapter of the pipe connecting device according to the present invention and the discharge pipe member, and the flange portion of the adapter and the flange-shaped convex portion of the discharge pipe member are fastened by the fastening member, and the adapter If the other end is connected to the testing machine, the discharge pipe member is connected to the testing machine via the adapter, and the required test can be performed. After completion of the test, if the fastening member is removed and the adapter is separated, the tip of the discharge pipe member is already formed in the welding groove shape in the manufacturing process, so it can be shipped as it is and welded to the plant on site. Can be connected and installed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a pipe connecting device according to an embodiment of the present invention for connecting a discharge pipe of a feed pump for a high-pressure boiler to a test machine for factory trial operation. In FIG. 1, 1 is a discharge pipe member that is integrally or welded to a pump body 7, 2 is an adapter that is a connection medium, 3 is a mounting member that is a part of a fastening member, 4 is a tester pipe, and 5 is a tester pipe. It is a testing machine pipe joint. This water supply pump is a high-pressure pump used in a thermal power plant, etc., and in a plant such as a local power plant, the tip of the discharge pipe member 1 is welded to a water supply pipe such as a high-pressure boiler to prevent leakage due to high pressure. Connected by. Therefore, the tip of the discharge pipe member 1 is already formed in the welding groove 1a by machining at the stage of the manufacturing process of this pump. Further, a flange-shaped convex portion 1b is formed on the outer peripheral surface of the middle portion of the discharge pipe member 1. Further, the outer peripheral surface of the discharge pipe member 1 on the tip side of the flange-shaped convex portion 1b is smoothly finished so that an O-ring 6 described later comes into close contact therewith to ensure watertightness.

In FIG. 1, an adapter 2 is a component for enabling the discharge pipe member 1 formed in the above shape to be connected to a tester pipe 4 by a tester pipe joint 5. The side of the adapter 2 to be connected to the discharge pipe member 1 is formed so that the inner diameter fits to the outer peripheral surface of the discharge pipe member 1 on the tip side of the flange-shaped protrusion 1b, and the outer diameter is passed through a fastening bolt 91 described later. Flange 2f with a diameter large enough to make a hole
Are formed. Two O-ring grooves are formed on the inner peripheral surface of the flange portion 2f fitted to the outer peripheral surface of the discharge pipe member 1, and the O-ring groove seals between the O-ring groove and the outer peripheral surface of the discharge pipe member 1. An O-ring 6 is inserted as a sealing material for this. The flange portion 2f has a plurality of fastening bolts 9
There is a hole for passing 1. The other end of the adapter 2 is formed with a pipe end joint shape 2c so as to be connected to the tester pipe 4 by the tester pipe joint 5. As shown in FIG. 2, the tester pipe joint 5 is fastened by fastening bolts 51 and fastening nuts 52 so that the inclined faces of both pipe ends to be connected are held by the inner inclined faces of the tester pipe joint 5. To connect.

In FIG. 1, a fastening bolt 91, a fastening nut 92 and a mounting member 3 are fastening members for fastening the discharge pipe member 1 and the adapter 2. The mounting member 3 is in the form of a split ring, the outer diameter is approximately the same as the outer diameter of the flange portion 2f of the adapter 2, and the inner diameter is the flange-shaped convex portion 1b of the discharge pipe member 1.
Of the discharge pipe member 1 closer to the pump body 7 than the flange-shaped convex portion 1b and the portion formed to have the same inner diameter as the outer diameter and the same axial length.
Is formed in a stepped shape including an outer diameter and a portion having the same inner diameter. In addition, the mounting member 3 is provided with a hole for passing the fastening bolt 91.

Next, the operation of the embodiment shown in FIG. 1 will be described. The O-ring 6 is inserted into the O-ring groove on the inner peripheral surface of the flange portion 2f of the adapter 2, and the inner diameter of the flange portion 2f of the adapter 2 is externally fitted and inserted into the distal end portion of the discharge pipe member 1. Next, the mounting member 3 in the form of a split ring is mounted along with the bolt hole of the adapter 2, the fastening bolt 91 is inserted, and the fastening nut 92 is screwed into the fastening bolt 91 to attach the flange portion 2f of the adapter 2 and the mounting member 3 to each other. Tighten and. Since the mounting member 3 has a step on the inner diameter side, the stepped portion thereof engages with the jaw of the flange-shaped projection 1b of the discharge pipe member 1, and the discharge pipe member 1 and the adapter 2 are connected via the mount member 3. Is concluded.
At this time, the O-ring 6 inserted into the groove of the adapter 2 comes into close contact with the outer peripheral surface of the distal end portion of the discharge pipe member 1 that is smoothly formed, so that water leakage is prevented.

Next, in FIG. 1, the pipe end joint shape 2c at the other end of the adapter 2 is butted against the pipe end joint shape 4d of the tester pipe 4, the tester pipe joint 5 is put on the connecting portion, As shown in, the tester pipe joint 5 is tightened with the fastening bolts 51 and the nuts 52. Then, the inner inclined surface of the tester pipe joint 5 abuts the inclined surfaces of the pipe end joint shape 2c and the pipe end joint shape 4d, and the end faces of the pipe end joint shape 2c and the pipe end joint shape 4d are crimped by a wedge action. Let me connect. Between the end surface of the pipe end joint shape 2c and the end surface of the pipe end joint shape 4d,
As shown in FIG. 2, the packing is usually sandwiched to prevent leakage. Since the discharge pipe member 1 of the pump is now connected and connected to the tester pipe 4 of the tester via the adapter 2, the test run of the pump or the required performance test can be performed.

After the test is completed, if the fastening nut 92 is unscrewed to pull out the fastening bolt 91 and the attachment member 3 which is a split ring is removed, the discharge pipe member 1 can be pulled out from the adapter 2 and removed. As described above, since the tip of the discharge pipe member 1 is already formed in the welding groove 1a by machining at the stage of the manufacturing process of this pump, the pump that has been tested can be shipped as it is and immediately. Can be installed on site by welding to the plant.
That is, conventionally, after the pipe end joint shape 1c is formed at the tip of the discharge pipe member 1 at the stage of the manufacturing process and the trial run is completed,
The water supply pump was carried into the machine factory again, disassembled, the discharge pipe member 1 was cut in the middle, the welding groove 1a was formed by machining, and the assembly was reassembled. By forming 1a, the process of forming and forming the welding groove 1a after the trial run can be eliminated, and the cost can be reduced and the quality assurance can be improved. The adapter 2, the mounting member 3, the fastening bolts 91, and the nuts 92 can be commonly used as components on the tester side for a pump forming such a welding groove 1a during a trial run. .

Although not shown, when the protruding height of the collar-shaped convex portion 1b is small, fastening bolts and nuts for fastening the split ring-shaped mounting members 3 to each other are provided to attach the mounting members 3 to each other. It may be connected to an integral ring to further secure the connection between the discharge tube member 1 and the adapter 2.

In the above embodiment, the mounting member 3 is explained as a part of the fastening member, but the collar-shaped convex portion 1b of the discharge pipe member 1 is described.
If the outer diameter of the flange portion 2f of the adapter 2 can be set to be as large as the outer diameter of the flange portion 2f of the adapter 2, a hole for inserting the fastening bolt 91 is formed in the flange-shaped convex portion 1b, and the flange portion 2f and the flange-shaped convex portion 1 are formed.
The mounting member 3 can be eliminated by adopting a normal flange coupling structure in which the b is directly fastened with the fastening bolt 91 and the nut 92.

[0015]

As described above, according to the present invention, the tip of the discharge pipe member is formed in the welding groove at the stage of the manufacturing process of the pump, so that it is shipped immediately without any processing after the trial run. Therefore, it is possible to reduce the process, cost, and improve quality assurance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pipe connecting device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional pipe connecting device.

[Explanation of symbols]

 1: Discharge pipe member, 1a: Welding groove, 1b: Collar-shaped convex part, 2: Adapter, 2c: Pipe end joint shape, 2f: Flange part, 3: Mounting material, 4: Test machine pipe, 4d: Pipe End joint shape, 5: Testing machine pipe joint, 6: O-ring, 7: Pump body, 91: Fastening bolt, 92: Fastening nut.

Claims (1)

[Claims] 1. A discharge pipe member of a pump, wherein a distal end portion of the circular pipe is formed in a welding groove shape, and a flange-shaped convex portion is formed on an intermediate outer peripheral surface, and one end portion is a distal end portion of the discharge pipe member. An adapter formed with an inner diameter that fits into the outer diameter of the circular pipe and protruding in the outer diameter direction, and the other end of which has a pipe end joint shape for connecting to a testing machine; A pipe connection device comprising a flange member of the adapter and a fastening member that fastens the flange-shaped protrusion of the discharge pipe member so as to be connected to the discharge pipe member with a sealing material interposed therebetween.