CN114110232A

CN114110232A - Manufacturing method of control valve

Info

Publication number: CN114110232A
Application number: CN202011606272.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2020-08-28
Filing date: 2020-12-28
Publication date: 2022-03-01

Abstract

The invention discloses a manufacturing method of a control valve, wherein a shell is processed and manufactured by steel, the shell of the scheme is equivalent to a valve body in the background technology, and compared with the background technology that the valve body is forged by brass materials, the manufacturing cost of the scheme is low.

Description

Manufacturing method of control valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a manufacturing method of a control valve.

Background

In refrigeration systems, ball valves are used to control the make and break of fluid.

Fig. 1 is a schematic cross-sectional view of a ball valve of the background art. As shown in fig. 1, the ball valve includes a valve body 01, a valve seat 02, a first connection pipe 03, a second connection pipe 04, a valve stem 05, and a valve core 06. The valve body 01 is fixedly connected with the valve seat 02, the valve body 01 is fixedly connected with the first connecting pipe 03, and the valve seat 02 is fixedly connected with the second connecting pipe 04. The valve core 06 can be driven to rotate to open and close the valve by rotating the valve rod 05. In the ball valve, the blank of the valve body 01 is forged by brass materials, and the manufacturing cost is high.

In view of the above, how to reduce the manufacturing cost of the ball valve body provides an improvement to those skilled in the art.

Disclosure of Invention

The invention aims to provide a manufacturing method of a control valve, which comprises the following steps: step 10: processing and preparing a shell by using steel; processing and preparing a first valve seat, a second valve seat and a valve head by using steel; step 20: fixedly connecting the valve head, the shell and the first valve seat through welding to form a first component A; step 30: and assembling the first component A and the second valve seat, and at least partially extending the second valve seat into the shell, wherein the shell and the second valve seat are fixedly connected through welding.

According to the manufacturing method of the control valve, the shell is made of steel materials in a machining mode, the shell is equivalent to a valve body in the background technology, and compared with the valve body in the background technology, the control valve is forged by brass materials, the manufacturing cost is low.

Drawings

FIG. 1: background art a schematic cross-sectional view of a control valve;

FIG. 2: the invention provides a cross-sectional schematic view of a control valve;

FIG. 3: fig. 2 is a schematic structural view of the first component a before assembly;

FIG. 4: the schematic diagram of the first assembly A after being assembled with the valve rod, the valve core and the first sealing gasket;

FIG. 5: the structure of the second component B in FIG. 2 is schematically shown;

FIG. 6: a schematic view of the second component B after assembly with the second gasket;

FIG. 7: the invention provides another schematic diagram of the first component A' after being assembled with a valve rod, a valve core and a first sealing gasket.

In fig. 2 to 7:

11-housing, 111-body portion, 112-extension;

1121-upper end surface, 113-outer edge surface;

2-a valve seat member;

21-first valve seat, 211-first valve seat step;

212-first step, 2121-step face, 213-valve seat annular groove;

22-second valve seat, 221-second valve seat step;

23-a first connection pipe, 24-a second connection pipe;

25-a first gasket, 26-a second gasket;

3-a valve head part;

31-valve head, 311-second step part, 312-extension part, 313-external thread part;

32-a stop ring;

4-valve stem component, 41-valve stem;

411-first annular groove, 412-second annular groove, 413-key portion;

42-first O-ring, 43-second O-ring;

5-valve core, 51-groove, 6-valve cap, 61-internal thread part and 7-welding ring;

a-a first component, B-a second component.

Detailed Description

In order that those skilled in the art will better understand the present invention, the following detailed description is given with reference to the accompanying drawings and the detailed description.

It should be noted that the terms "upper" and "lower" as used herein are defined in the drawings and the positions of the components in fig. 2 to 7, respectively, only for the sake of clarity and convenience. It is to be understood that the directional terms used herein are not intended to limit the scope of the claims.

FIG. 2 is a schematic cross-sectional view of a control valve according to the present invention; FIG. 3 is a schematic structural view of the first assembly A of FIG. 2 before assembly; FIG. 4 is a schematic view of the first assembly A after assembly with the valve stem, the valve cartridge, and the first gasket; FIG. 5 is a schematic structural diagram of a second assembly B in FIG. 2; fig. 6 is a schematic view of the second assembly B after assembly with the second gasket.

In the present embodiment, the housing 11, the first valve seat 21, the second valve seat 22, the first connecting pipe 23, the second connecting pipe 24, the valve head 31, the valve core 5, and the valve bonnet 6 are made of steel, and specifically, a stainless steel material is taken as an example for description.

As shown in fig. 2 to 6, the control valve is manufactured as follows:

step 10: preparing a shell 11, wherein the shell 11 comprises a body part 111 and an extension part 112, the shell 11 is made of steel, specifically, the stainless steel pipe is cut into a shell blank, and then the shell blank is punched and flanged out of the extension part 112. Of course, the stainless steel plate may be used, and the stainless steel plate is first rolled into a tube and then the subsequent steps are the same as those of the tube. A first valve seat 21, a second valve seat 22, a first nipple 23, a second nipple 24, a first packing 25, and a second packing 26 are prepared. The first valve seat 21 and the second valve seat 22 are machined from stainless steel sections, the machined step surface of the first valve seat 21 faces the first valve seat step 211 of the valve core 5, the machined step surface of the second valve seat 22 faces the second valve seat step 221 of the valve core 5, and the first connecting pipe 23 and the second connecting pipe 24 are made from stainless steel sections, it should be noted that, in an actual production process, in order to facilitate matching welding with a copper connecting pipe of a customer, a copper bush may be welded at a connecting end of the first connecting pipe 23 and the second connecting pipe 24; the first seal 25 and the second seal 26 are made of PTFE, PEK, high temperature nylon, or the like.

Preparing a valve head 31 and a stop ring 32, wherein the valve head 31 is roughly in a hollow cylindrical shape and is machined from a stainless steel section bar, the valve head 31 comprises a second step part 311 with an upward step surface and an extension part 312 extending upwards from the second step part 311 in the axial direction, the stop ring 32 is arranged on the second step part 311, and the outer peripheral wall of the valve head 31 is machined with an outer thread part 313.

Preparing a valve rod 4, wherein the valve rod 4 comprises a rod body 41, a first O-ring 42 and a second O-ring 43, the valve rod 41 is machined from stainless steel rods, the rod body 41 comprises a first annular groove 411, a second annular groove 412 and a key part 413, the first O-ring 42 is sleeved in the first annular groove 411, and the second O-ring 43 is sleeved in the second annular groove 412.

Preparing a valve core 5 and a valve cap 6, wherein the valve core 5 and the valve cap 6 are processed and manufactured by stainless steel materials, and an internal thread part 61 is lathed on the inner peripheral wall of the valve cap 6.

Step 20: the valve head 31, the housing 11, the first valve seat 21 and the first connecting pipe 23 are fixedly connected as a first component a by furnace brazing, specifically, the first valve seat 21 at least partially extends into the body portion 111, the valve head 31 partially extends into the extending portion 112, the first valve seat 21 and the body portion 111, and the valve head 31 and the extending portion 112 are fixed by furnace brazing in a one-time welding manner.

The second valve seat 22 and the second adapter tube 24 are fixedly connected as a second assembly B by furnace brazing.

Step 30: the valve rod 4 is installed in the first assembly A, the stop ring 32 is placed on the second step part 311 of the valve head 31, and the extension part 312 is riveted on the stop ring 32, so that the stop ring 32 is fixedly connected with the valve head 31, the stop ring 32 can limit the upward movement of the valve rod 41, and the stop ring 32 can limit the circumferential rotation stroke of the valve rod 41; the first packing 25 is placed on the first valve seat step 211 and then is installed in the valve core 5, and the key portion 413 of the valve rod 4 extends into the housing 11 and is in keyway fit with the groove 51 of the valve core 5.

The second gasket 26 is assembled with the first component a after being disposed on the second valve seat step portion 221 of the second component B. Wherein the second valve seat 22 at least partially extends into the housing 11, and the housing 11 and the second valve seat 22 are fixedly connected by laser welding, it is conceivable that argon arc welding, gas shielded welding, etc. may be used for the housing 11 and the second valve seat 22.

Step 40: the bonnet 6 is screwed into the valve head 31 to form a control valve, and the bonnet 6 is fixedly coupled to the valve head 31 by screwing the male screw portion 313 into the female screw portion 61.

The casing in this embodiment is made by stainless steel tubular product or panel, and this casing is equivalent to the valve body in the background art, compares in the background art that the valve body is forged by the brass material and forms, and the low in manufacturing cost of this scheme, processing is convenient.

Fig. 7 is a schematic view of another first assembly a' of the present invention assembled with a valve stem, a valve core, and a first gasket.

As a modified design, as shown in fig. 7, the valve head 31 is not provided with the extension 312, and the stopper ring 32 is first placed on the second stepped portion 311 ' of the valve head 31 ', and then the stopper ring 32 and the valve head 31 ' are welded and fixed by laser welding. Thus, compared to the above embodiment, the valve head 31' and the stop ring 32 are more reliably connected.

Further, as shown in fig. 2 and 3, the step 10 further includes: the first valve seat 21 is lathed with a valve seat annular groove 213 and a first step part 212 with a step surface facing the valve core 5 to prepare a welding ring 7; the step 20 further includes: after the welding ring 7 is set in the valve seat annular groove 213, the housing 11 and the first valve seat 21 are press-fitted with interference fit so that the step surface 2121 of the first step portion 212 abuts against the outer edge surface 113 of the main body portion 111 to be pre-positioned, and then the first valve seat 21 and the housing 11 are fixed by brazing in a furnace. The beneficial effect is that the assembly precision of the control valve can be improved by arranging the first step part 212 for prepositioning.

Meanwhile, in the above step 20, the valve head 31 partially extends into the extension 112, and after the welding ring 7 is placed on the upper end surface 1121 of the extension 112, the valve head 31 and the housing 11 are fixed by brazing in a furnace.

In the manufacturing method of the control valve, all parts are basically made of stainless steel materials, and the requirement of controlling the lead content of products in the current society is met; the parts are fixed in a one-time welding mode, so that the process is simple and the processing is convenient; the steel plate is fixedly connected through furnace brazing and laser welding, acid pickling is not needed, and the production process is clean and environment-friendly.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A method of manufacturing a control valve, comprising:

step 10: processing and preparing a shell by using steel; processing and preparing a first valve seat, a second valve seat and a valve head by using steel;

step 20: fixedly connecting the valve head, the shell and the first valve seat through welding to form a first component A;

step 30: and assembling the first component A and the second valve seat, and at least partially extending the second valve seat into the shell, wherein the shell and the second valve seat are fixedly connected through welding.

2. The method for manufacturing a control valve according to claim 1, wherein in the step 10, a first nozzle, a second nozzle, a valve stem, and a valve body are manufactured by using steel materials, and in the step 20, the valve head, the housing, the first valve seat, and the first nozzle are fixedly connected by furnace brazing to form a first assembly a, and the second valve seat and the second nozzle are fixedly connected by furnace brazing to form a second assembly B; in step 30, the valve rod and the valve core are assembled with the second assembly B after being assembled into the first assembly a.

3. The method of manufacturing a control valve according to claim 2, wherein in the step 10, the housing is manufactured by using stainless steel pipes or plates, the housing includes a main body and an extension, and the extension is formed by punching and flanging the stainless steel pipes; in step 20, the first valve seat at least partially extends into the body portion, the valve head portion extends into the extending portion, and the first valve seat and the body portion, and the valve head and the extending portion are fixed at one time by furnace brazing.

4. A method of manufacturing a control valve according to claim 3, wherein the step 10 further comprises: the first valve seat lathes a valve seat annular groove and a step surface facing to a first step part of the valve core to prepare a welding ring; the step 20 further includes: after the welding ring is arranged in the annular groove of the valve seat, the first valve seat is in press fit interference fit with the body part, so that the step surface of the first step part is abutted against the outer edge surface of the body part, and then the first valve seat and the shell are fixed by brazing in a furnace.

5. A method of manufacturing a control valve according to claim 3, wherein the step 10 further comprises: preparing a welding ring; in the step 20: and extending the valve head part into the extending part, placing the welding ring on the upper end surface of the extending part, and fixing the valve head and the shell through furnace brazing.

6. The method of manufacturing a control valve according to claim 2, wherein the step 10 further comprises: the valve head is machined from a stainless steel section, a second step part with an upward step surface and an extending part extending upwards from the second step part are machined on the valve head, and a stop ring is prepared; the step 30 further includes, after the valve stem is installed, placing the stop ring on the second stepped portion, and riveting the extension portion to the stop ring, so that the stop ring is fixed to the valve head.

7. The method of manufacturing a control valve according to claim 2, wherein the step 10 further comprises: the valve head is machined from a stainless steel section, a second step part with an upward step surface is machined on the valve head, and a stop ring is prepared; the step 30 further includes, after the valve stem is installed, placing the stop ring on the second stepped portion, and fixing the stop ring and the valve head by welding.

8. The method of manufacturing a control valve according to claim 2, wherein the step 10 further comprises: preparing a first sealing gasket and a second sealing gasket, machining a first valve seat step part on the first valve seat, and machining a second valve seat step part on the second valve seat;

the step 30 further includes assembling the first assembly a and the second assembly B after placing the first packing on the first valve seat step portion and then placing the valve stem and the valve element into the first assembly a and placing the second packing on the second valve seat step portion.

9. The method of manufacturing a control valve according to any one of claims 1 to 8, wherein the step 10 further comprises: the outer peripheral wall of the valve head is lathed with an external thread part; preparing a valve cap by using steel processing, and lathing an internal thread part on the inner peripheral wall of the valve cap;

further comprising the step 40: and screwing the valve cap into the valve head, wherein the valve cap and the valve head are fixed by screwing the internal thread part and the external thread part.