CN218016777U - Welding tool for piston type check valve - Google Patents

Abstract

The utility model discloses a piston check valve's welding frock, including the foundation base, the below of foundation base is provided with the spliced pole, the top of foundation base is provided with the support plug, locates with the cover is taken over in the import that valve body welding is as an organic whole to the cover support on the plug, the length that the support plug stretches into the import and takes over is greater than the valve body hold the free end of the piston of intracavity with distance between the interface that the import was taken over. When the welding fixture of the piston type check valve is used for welding the piston type check valve, the inlet connecting pipe is tightly matched with the fixed section of the supporting core rod, the tail end of the supporting core rod supports the piston in the valve body, so that a distance is generated between the piston and the valve body, heat conduction is interrupted, high temperature generated when the valve body is welded with the valve seat and/or the valve seat is welded with the outlet connecting pipe is prevented from burning a sealing ring on the piston through heat conduction, and the finished product rate and the product quality are improved.

Description

Welding tool for piston type check valve

Technical Field

The utility model relates to a welding frock field, concretely relates to welding frock of piston check valve.

Background

A piston check valve among the prior art, the structure is as shown in fig. 1 and fig. 2, including valve body 5, 51 is taken over in the one end fixedly connected with import of valve body 5, install piston 53 in the valve body 5, piston 53 is close to the one end that 51 was taken over in the import and is provided with sealing washer 55 and gasket 56 through the mode of equipment punching press, the one end that 51 was taken over in the import was kept away from to valve body 5 is connected with the disk seat 50 of integral type structure, disk seat 50 and piston 53 axial swing joint, install the cover between piston 53 and the disk seat 50 and locate the spring 54 on piston 53, the connection intracavity of disk seat 50 is installed the export and is taken over 52.

When the piston type check valve is produced, the connecting parts of the valve body and the valve seat, the valve seat and the outlet connecting pipe and the valve body and the inlet connecting pipe are required to be welded and fixed. Welding, also known as fusion welding, is a manufacturing process and technique for joining metals or other thermoplastic materials, such as plastics, by means of heat, high temperature or high pressure.

In the actual production process, the valve body and the inlet connecting pipe are welded in advance, the piston is axially and movably connected to the valve seat and is arranged in the valve body, and then the joints of the valve seat and the valve body and the joints of the valve seat and the outlet connecting pipe are welded. However, when the piston is installed in the valve body, the sealing ring arranged at one end of the piston, which is far away from the valve seat, is partially contacted with the valve body, and the valve seat is welded with the valve body and the valve seat and the outlet connecting pipe under the condition.

Therefore, a welding tool is urgently needed to be designed to assist welding, and the sealing ring is prevented from being burnt by heat conduction at high temperature when the valve seat and the valve body and/or the valve seat and the outlet connecting pipe are welded.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in the processing process of the piston type check valve, the sealing ring in contact with the valve body can be burnt by high temperature generated when the valve seat and the valve body and/or the valve seat and the outlet connecting pipe are welded through heat conduction, and the finished product rate and the product quality of a finished product are influenced.

In order to solve the technical problem, the utility model provides a technical scheme as follows:

the utility model provides a piston check valve's welding frock, piston check valve's welding frock includes the foundation base, the below of foundation base is provided with the spliced pole, the top of foundation base is provided with the support plug, with cover is taken over in the import that valve body welding is as an organic whole and is located on the support plug, the length that the support plug stretches into the import and takes over is greater than the free end that holds the piston of intracavity of valve body with distance between the interface that the import was taken over.

Furthermore, a fixed section is arranged on the supporting core rod close to the base seat, and a supporting section is arranged at the other end adjacent to the fixed section.

Furthermore, a limiting section is arranged between the fixing section and the base seat, and the diameter of the limiting section is larger than that of the fixing section.

Further, the support section comprises a large diameter section and a small diameter section, and the small diameter section is an end part for supporting the core rod.

Furthermore, an arc-shaped guide surface is arranged at the junction of the end surface of the free end of the small-diameter section and the peripheral surface.

Furthermore, still include certainly the free end terminal surface of spliced pole is along the vertical protection gas channel of axial extension, and a plurality of with the horizontal protection gas channel of vertical protection gas channel intercommunication, it is a plurality of the export of horizontal protection gas channel is located the major diameter section that is close to little diameter section.

Further, the connecting column is a threaded column.

The welding frock of piston check valve in this embodiment has following advantage:

when the welding tool of the piston type check valve is used for auxiliary welding of the piston type check valve, when the support core rod on the welding tool is sleeved based on the inlet connecting pipe, the length of the support core rod extending into the inlet connecting pipe is larger than the distance between the free end of the piston located in the valve body accommodating cavity and the interface of the inlet connecting pipe, the support core rod supports the piston arranged in the valve body, so that a sealing ring on the piston is prevented from contacting with the valve body, heat conduction is interrupted, the sealing ring on the piston is protected from being damaged due to high welding temperature, and the finished product rate and the product quality of a finished product are improved.

Drawings

FIG. 1 is a schematic diagram of a conventional piston check valve;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of a welding tool for the piston check valve in the embodiment;

FIG. 4 is a schematic structural diagram of the welding tool of the piston type check valve in the embodiment during operation;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 4;

description of reference numerals:

1-a foundation base; 2-supporting the core rod; 20-a limiting section; 21-a fixed segment; 22-a support section; 221-large diameter section; 222-a small diameter section; 223-a guiding surface; 3-a threaded post; 31-longitudinal shielding gas channel; 32-transverse shielding gas channel; 4-welding machine; 5-a valve body; 50-a valve seat; 51-inlet connection pipe; 52-outlet connection; 53-a piston; 54-a spring; 55-sealing ring; 56-a gasket; 57-top column.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, an integral connection, or a detachable connection; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.

The welding frock of piston check valve in this embodiment, see fig. 3, including base 1, the below of base 1 is provided with the spliced pole, and is preferred, the spliced pole is threaded column 3, and the welding frock passes through threaded column 3 fixed connection on welding machine 4.

A supporting core rod 2 is arranged above the foundation base 1, and preferably in this embodiment, a fixing section 21 is arranged on the supporting core rod 2 close to the foundation base 1, and a supporting section 22 is arranged adjacent to the fixing section 21. Wherein, the supporting section 22 comprises a large diameter section 221 and a small diameter section 222, the small diameter section 222 is a terminal end for supporting the mandrel 2, and an arc-shaped guiding surface 223 is arranged at the intersection of the end surface and the peripheral surface of the free end of the small diameter section 222.

A limiting section 20 is further arranged between the fixing section 21 on the supporting core rod 2 and the base seat 1, and the diameter of the limiting section 20 is larger than that of the fixing section 21, so that the downward moving distance of the inlet connecting pipe 51 is limited during sleeving.

When the welding tool is used for auxiliary welding of the piston type check valve, the valve body 5 and the inlet connecting pipe 51 are welded in advance, and after welding is completed, the piston 53 is axially and movably connected to the valve seat 50; an elastic member is arranged between the piston 53 and the valve seat 50, and a seal ring 55 and a gasket 56 are arranged on the piston 53 by assembling and stamping. In the present embodiment, the elastic member is preferably a spring 54, and the spring 54 is sleeved on the piston 53.

The valve seat 50 is then connected to the end of the valve body 5 remote from the inlet connection 51, with the sealing ring 55 on the piston 53 in contact with the valve body 5.

And sleeving an inlet connecting pipe 51 in the assembly body on a support core rod 2 of the welding tool. During the bell and spigot joint, the small-diameter section 222 is easy to enter the inlet connecting pipe 51 due to the relatively small diameter, and the arc-shaped guide surface 223 arranged on the small-diameter section 222 is smooth in surface, so that the guide function is achieved, and the damage to the inner wall of the inlet connecting pipe 51 in the installation process is avoided.

The diameter of the large-diameter section 221 of the supporting section 22 is slightly smaller than the inner diameter of the inlet connecting pipe 51, so that the supporting core rod 2 can enter the accommodating cavity of the inlet connecting pipe 51 conveniently; the inner diameter of the interface of the inlet connecting pipe 51 is matched with the fixed section 21 of the supporting core rod 2, and the two are tightly matched to play a role in fixing the inlet connecting pipe 51.

Referring to fig. 4 and 5, after the sleeving is completed, because the length of the support core rod 2 extending into the inlet connection pipe 51 is greater than the distance between the free end of the piston 53 and the interface of the inlet connection pipe 51, at this time, the end surface of the free end of the small diameter section 222 of the support core rod 2 of the welding tool abuts against the top pillar 57 of the free end of the piston 53, and the spring 54 located between the valve seat 50 and the piston 53 is deformed by an upward supporting force, so that the piston 53 moves upward to drive the sealing ring 55 to be separated from the valve body 5, and the sealing ring 55 is no longer in contact with the valve body 5. The heat conduction is interrupted and the welding between the valve body 5 and the valve seat 50 and between the valve seat and the outlet nipple 52 is carried out again, so that the sealing ring 55 is not burned by the heat conduction of the metal valve body 5 and the valve seat 50.

In this embodiment, the welding fixture of the piston check valve further includes a longitudinal shielding gas channel 31 extending axially from the free end surface of the threaded column 3, and a plurality of transverse shielding gas channels 32 communicated with the longitudinal shielding gas channel 31, and an outlet of each of the plurality of transverse shielding gas channels 32 is located on the large-diameter section 221 close to the small-diameter section 222. Preferably, the present embodiment is provided with two lateral shielding gas passages 32. The shielding gas is introduced into the free end face opening end of the threaded column 3 through the longitudinal shielding gas channel 31, and then enters the valve body 5 through the transverse shielding gas channel 32 and the gap between the small-diameter section 222 and the inlet connecting pipe 51, so as to further protect the welding.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (7)

1. The utility model provides a piston check valve's welding frock, piston check valve includes valve body (5), connects in disk seat (50) of valve body, the import that is connected with the one end that the disk seat was kept away from to the valve body is taken over (51) to and the export that is connected with the other end of disk seat is taken over (52), still be provided with piston (53) on the disk seat, be provided with sealing washer (55), its characterized in that on the piston: piston check valve's welding frock includes base (1), the below of base is provided with the spliced pole, the top of base is provided with support plug (2), with the cover is taken over in the import that the valve body welding is as an organic whole and is located support on the plug, support the plug and stretch into the length that the import was taken over and be greater than the free end of the piston that holds the intracavity of valve body with distance between the interface that the import was taken over.

2. The welding frock of piston check valve of claim 1, characterized in that: a fixed section (21) is arranged on the supporting core rod close to the base seat, and a supporting section (22) is arranged at the other end adjacent to the fixed section.

3. The welding frock of piston check valve of claim 2, characterized in that: a limiting section (20) is further arranged between the fixing section and the base seat, and the diameter of the limiting section is larger than that of the fixing section.

4. The welding frock of piston check valve of claim 2, characterized in that: the support section includes a large diameter section (221) and a small diameter section (222) that is a tip portion that supports the mandrel.

5. The welding frock of piston check valve of claim 4, characterized in that: and an arc-shaped guide surface (223) is arranged at the junction of the end surface of the free end of the small-diameter section and the peripheral surface.

6. The welding frock of piston check valve of claim 4, characterized in that: still include certainly the free end terminal surface of spliced pole is along longitudinal protection gas channel (31) of axial extension, and a plurality of with horizontal protection gas channel (32) of longitudinal protection gas channel intercommunication, it is a plurality of the export of horizontal protection gas channel is located the big diameter section that is close to little diameter section.

7. The welding frock of piston check valve of claim 1, characterized in that: the connecting column is a threaded column (3).

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