Valve seat assembly fabrication method, valve seat assembly and electric valve

Abstract

A valve seat assembly fabrication method, a valve seat assembly (90) and an electric valve (100). The valve seat assembly fabrication method comprises the following steps: separately pre-fabricating a valve seat (10) and a valve port member (20), wherein the inside of the valve seat (10) is provided with a valve cavity (11), and one end of the valve port member (20) is provided with a valve port (21), the valve port (21) being configured for sealing fit with a valve core (50); mounting the valve port member (20) into the valve cavity (11) and fixedly connecting same to the valve seat (10), and communicating the valve port (21) with the valve cavity (11); providing a side wall of the valve seat (10) with a first through hole (12); and providing a side wall of the valve port member (20) with a connecting port (22) through the first through hole (12), and coaxially arranging the first through hole (12) and the connecting port (22).

Description

Valve seat assembly processing method, valve seat assembly and electric valve

[0001] Related applications

[0002] The present application claims priority to Chinese Patent Application No. 202410468510.5, filed on April 18, 2024, entitled "Valve seat assembly processing method, valve seat assembly and electric valve" and Chinese Patent Application No. 202420812793.6, filed on April 18, 2024, entitled "Electric valve", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of electric valve processing, in particular to a valve seat assembly processing method, a valve seat assembly and an electric valve. BACKGROUND

[0004] The electric valve is used for cutting off or passing through the medium, and mainly comprises a valve core, a valve seat, an inlet connector and an outlet connector. The valve seat is provided with a valve port. The inlet connector is connected to the valve seat, and the outlet connector is connected to the valve seat through the valve port. The valve core can block or open the valve port to separate or connect the inlet connector and the outlet connector.

[0005] A common electric valve has an inlet connector and an outlet connector connected to the side wall of the valve seat through a first through hole and a second through hole respectively, and arranged coaxially. The valve seat is internally provided with a valve port piece. One end of the valve port piece is used to form a valve port matched with the valve core, and the side wall of the other end is provided with an interface for conducting with the inlet connector or the outlet connector. When the valve core and the valve port piece are assembled, the first through hole or the second through hole and the interface need to be located on the same straight line to facilitate the installation of the inlet connector and the outlet connector. However, such a high assembly precision requirement of the valve seat and the valve port piece leads to a large assembly difficulty. SUMMARY

[0006] Therefore, it is necessary to provide a valve seat assembly processing method, a valve seat assembly and an electric valve capable of reducing the assembly difficulty of the valve seat and the valve port piece.

[0007] A valve seat assembly processing method comprises the following steps: respectively pre-processing a valve seat and a valve port piece. The valve seat has a valve cavity. One end of the valve port piece has a valve port used for sealing cooperation with a valve core. The valve port piece is installed in the valve cavity and fixedly connected with the valve seat, and the valve port is communicated with the valve cavity. A first through hole is formed on the side wall of the valve seat. An interface is formed on the side wall of the valve port piece through the first through hole, and the first through hole and the interface are coaxially arranged.

[0008] In one embodiment, the valve seat assembly processing method further comprises: forming a second through hole on the side wall of the valve seat, and the second through hole is coaxially arranged with the first through hole.

[0009] In one of the embodiments, after the first through hole, the interface and the second through hole are processed, the valve seat assembly processing method further comprises: processing a matching surface in the inner wall of the valve port, the matching surface is used for sealing cooperation with the edge of the valve core.

[0010] In one of the embodiments, after the first through hole, the interface and the second through hole are processed, the valve seat assembly processing method further comprises: processing a stop step on the valve seat, and connecting a guide sleeve to the stop step; wherein the guide sleeve is sleeved on the outer periphery of the valve core and is used for guiding the movement of the valve core.

[0011] In one of the embodiments, the stop step and the matching surface are processed by one clamping.

[0012] In one of the embodiments, after the matching surface and the stop step are processed, the valve seat assembly processing method further comprises: inserting a first connecting pipe into the first through hole and inserting it into the interface; and inserting a second connecting pipe into the second through hole.

[0013] In one of the embodiments, the valve seat, the guide sleeve, the first connecting pipe and the second connecting pipe are integrally welded by furnace welding, and form a valve seat assembly.

[0014] In one of the embodiments, during the pre-processing of the valve seat, a positioning groove is formed in the bottom of the valve cavity, and the positioning groove is used for installing the valve port piece.

[0015] In one of the embodiments, the pre-processing mode of the valve seat and the valve port piece is configured as a bar stock pre-processing.

[0016] A valve seat assembly is processed by the valve seat assembly processing method of any one of the above embodiments.

[0017] An electric valve, comprising a transmission assembly, a valve core and a valve seat assembly, the valve core is movably installed in the valve seat, the transmission assembly is used to drive the valve core to move towards the direction of approaching or away from the valve port, so as to open or close the valve port.

[0018] In one of the embodiments, the valve seat assembly comprises a valve seat, a valve port piece, a first connecting pipe and a second connecting pipe, the valve port is formed in the valve port piece, the valve seat has a valve cavity, the valve port piece is installed in the valve cavity, the first connecting pipe is connected to the valve cavity from the periphery of the valve seat through the valve port, and the second connecting pipe is directly connected to the valve cavity from the periphery of the valve seat; the transmission assembly comprises a screw rod and a threaded sleeve, the screw rod is sleeved in the threaded sleeve and is threadedly connected with the threaded sleeve, wherein one of the screw rod and the threaded sleeve is connected with the valve core and is used to drive the valve core to move axially.

[0019] In one of the embodiments, the first connecting pipe and the second connecting pipe are coaxially arranged.

[0020] In one of the embodiments, the valve port is coaxially arranged with the valve core, and an interface is formed in the side wall of the valve port member, which is communicated with the valve port and used for mounting the first connecting pipe.

[0021] In one of the embodiments, a matching surface is formed in the inner wall of the valve port, which is configured as a conical surface and has a decreasing radius along the direction from the valve core to the valve port member.

[0022] In one of the embodiments, the threaded sleeve is fixedly connected with the valve seat assembly, and the valve core is connected with the threaded rod, which can drive the valve core to move axially along with the circumferential rotation of the threaded rod.

[0023] In one of the embodiments, the valve seat assembly further comprises a guide sleeve, which is connected with one end of the valve seat and forms the valve cavity together with the valve seat, the outer wall of the valve core is movably and sealingly matched with the inner wall of the guide sleeve, the threaded sleeve is arranged at the end of the guide sleeve away from the valve cavity, and the threaded sleeve is fixedly connected with the valve seat; and / or the threaded sleeve is fixedly connected with the guide sleeve.

[0024] In one of the embodiments, a stop step is formed in the inner wall of the valve seat, and the guide sleeve is arranged at the stop step and is in interference fit with the inner side wall of the stop step.

[0025] In one of the embodiments, a positioning groove is formed in the bottom wall of the valve cavity, and the valve port member is arranged in the positioning groove; or the valve port member is integrally formed with the valve seat.

[0026] In one of the embodiments, the positioning groove is coaxially arranged with the stop step.

[0027] In one of the embodiments, the valve core is formed with a balance channel, which penetrates through one end of the valve core close to the valve port member and one end of the valve core away from the valve port member, and the balance channel is communicated with the first connecting pipe when the valve core moves to close the valve port.

[0028] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0029] To better describe and illustrate the embodiments and / or examples of the inventions disclosed herein, reference can be made to one or more drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and / or examples, and the best mode presently contemplated of these inventions.

[0030] FIG. 1 is a cross-sectional view of an electric valve provided by the present application along the axial direction.

[0031] FIG. 2 is a cross-sectional view of a valve seat formed by pre-processing provided by the present application.

[0032] Fig. 3 is a cross-sectional view of a valve port piece according to the present application.

[0033] Fig. 4 is a cross-sectional view of a valve seat and valve port piece assembly.

[0034] Fig. 5 is a cross-sectional view of a valve seat assembly.

[0035] Fig. 6 is a cross-sectional view of a valve seat assembly according to another embodiment of the present application.

[0036] Reference numerals: 10, valve seat; 11, valve cavity; 12, first through hole; 13, second through hole; 14, stop step; 15, positioning groove; 20, valve port piece; 21, valve port; 211, mating surface; 22, interface; 30, first connector; 40, second connector; 50, valve core; 51, balance passage; 60, guide sleeve; 70, transmission assembly; 71, screw rod; 72, threaded sleeve; 73, rotor; 80, sleeve; 81, rotor cavity; 90, valve seat assembly; 100, electric valve. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0038] It should be noted that when an assembly is referred to as "fixed to" or "disposed on" another assembly, it can be directly on the other assembly or there can be an intervening assembly. When an assembly is referred to as "connected to" another assembly, it can be directly connected to the other assembly or there can be an intervening assembly. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the description of the present application are used for illustrative purposes only and do not indicate the only implementation.

[0039] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0040] In the present application, unless specifically defined and limited otherwise, the first feature is "on", "under", "above" or "over" the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature is "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0041] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0042] Referring to FIGS. 1-5, the present application provides an electric valve 100, which comprises a valve seat assembly 90, a valve core 50 and a transmission assembly 70. The valve seat assembly 90 comprises a valve seat 10 and a valve port piece 20, the valve port piece 20 is arranged in the valve seat 10, and the valve port piece 20 is provided with a valve port 21, and the transmission assembly 70 is used to drive the valve core 50 to move towards or away from the valve port 21, so as to open or close the valve port 21.

[0043] Further, referring to FIG. 1, the valve seat assembly 90 comprises the valve seat 10, the valve port piece 20, a first connecting pipe 30 and a second connecting pipe 40. The valve port 21 is provided in the valve port piece 20, the valve seat 10 has a valve cavity 11, the valve port piece 20 is arranged in the valve cavity 11, the first connecting pipe 30 is communicated with the valve cavity 11 from the side of the valve seat 10 through the valve port 21, and the second connecting pipe 40 is directly communicated with the valve cavity 11 from the side of the valve seat 10. The transmission assembly 70 comprises a screw rod 71 and a threaded sleeve 72, the screw rod 71 is arranged in the threaded sleeve 72 and is threadedly connected with the threaded sleeve 72, wherein one of the screw rod 71 and the threaded sleeve 72 is connected with the valve core 50 and is used to drive the valve core 50 to move axially.

[0044] Since the first connecting pipe 30 and the second connecting pipe 40 are communicated with the valve cavity 11 from the circumferential side of the valve seat 10 respectively, during the installation of the electric valve 100, only the space reserved on the circumferential side of the valve seat 10 is needed to arrange the first connecting pipe 30 and the second connecting pipe 40, without the need to reserve space on the end of the valve seat 10 along the axial direction, thereby reducing the requirement of the electric valve 100 on the installation space. Moreover, during the threaded cooperation of the threaded sleeve 72 and the screw rod 71, the axial movement of one to the other plays a guiding and limiting role, thereby enabling the screw rod 71 or the threaded sleeve 72 to drive the valve core 50 to move more smoothly and slowly, so as to slowly open or close the valve port 20. Therefore, compared with the related structure adopting the way of attracting the static iron core and the moving iron core, the electric valve 100 provided by the application can avoid the attraction noise generated by the attraction of the moving iron core and the static iron core when the valve is opened, and can also avoid the relatively large fluid noise caused by the instantaneous increase of the fluid speed when the valve port 21 is instantaneously opened. Since the screw rod 71 or the threaded sleeve 72 can only move axially relative to the other under the condition of being subjected to the circumferential force, when the valve core 50 moves to close the valve port 20, even if the fluid pressure at the first connecting pipe 30 is greater than the pressure in the valve cavity 11 and the second connecting pipe 40, the fluid exerts an axial force on the valve core 50, which is directed to the screw rod 71, and cannot drive the valve core 50 to move away from the valve port 20. Therefore, the first connecting pipe 30 can be used as an inlet pipe or an outlet pipe, and correspondingly, the second connecting pipe 40 can be used as an outlet pipe or an inlet pipe. That is, the electric valve 100 provided by the application can realize bidirectional flow.

[0045] There are two forms of the way that the threaded sleeve 72 and the screw rod 71 drive the valve core 50 to move axially, one of which is that, as shown in FIG. 1, the threaded sleeve 72 is fixedly connected to the valve seat assembly 90, the valve core 50 is connected to the screw rod 71, and the screw rod 71 can drive the valve core 50 to move axially as the screw rod 71 rotates circumferentially; the other is that the screw rod 71 is axially limited to the valve seat assembly 90, the threaded sleeve 72 is circumferentially limited to the valve seat assembly 90, the valve core 50 is connected to the threaded sleeve 72, and the threaded sleeve 72 can drive the valve core 50 to move axially as the screw rod 71 rotates circumferentially. Hereinafter, the process of driving the valve core 50 to move by the transmission assembly 70 will be introduced by taking the example that the threaded sleeve 72 is fixedly connected to the valve seat assembly 90, the valve core 50 is connected to the screw rod 71, and the screw rod 71 can drive the valve core 50 to move axially as the screw rod 71 rotates circumferentially.

[0046] As shown in FIG. 1, further, the first connecting pipe 30 and the second connecting pipe 40 are coaxially arranged. The through holes on the valve seat 10 connected with the first connecting pipe 30 and the second connecting pipe 40 are coaxially arranged, in other words, the first connecting pipe 30 and the second connecting pipe 40 are on the same straight line. In this way, the machining of the through holes on the valve seat 10 is facilitated.

[0047] Specifically, as shown in FIG. 5, the first through hole 12 and the second through hole 13 are arranged on the side wall of the valve seat 10, and the first through hole 12 is coaxially arranged with the second through hole 13. The first through hole 12 is used for mounting the first connecting pipe 30, and the second through hole 13 is used for mounting the second connecting pipe 40.

[0048] As shown in FIG. 1, the valve port 21 is coaxially arranged with the valve core 50, and the side wall of the valve port piece 20 is provided with an interface 22, which is in communication with the valve port 21 and is used for mounting the first connecting pipe 30. The interface 22 is coaxially and oppositely arranged with the first through hole 12. In this way, the valve port piece 20 has a simple structure, and after the first connecting pipe 30 is connected to the interface 22, the valve core 50 can realize the communication or isolation between the first connecting pipe 30 and the second connecting pipe 40 by opening or closing the valve port 21.

[0049] Further, as shown in FIG. 1 and FIG. 5, the inner wall of the valve port 21 is provided with a matching surface 211. The matching surface 211 is used for sealingly matching with the edge of the valve core 50.

[0050] For example, the matching surface 211 is configured as a conical surface, and the radius of the matching surface 211 has a decreasing trend along the direction from the valve core 50 to the valve port piece 20. In this way, when the outer edge of the valve core 50 abuts against the conical surface, the conical surface can simultaneously provide the valve core 50 with radial support force and axial support force, so that the valve core 50 can firmly close the valve port. Moreover, by adjusting the depth of the valve core 50 extending into the valve port 21, the size of the opening degree of the valve port 21 can be adjusted, thereby playing a role of flow regulation.

[0051] Optionally, in an embodiment, as shown in FIG. 1 and FIG. 5, the valve port piece 20 is fixedly connected to the valve seat 10. That is, the valve port piece 20 and the valve seat 10 are separately arranged, and the valve port piece 20 and the valve seat 10 are assembled after being respectively machined. Specifically, the valve port piece 20 and the valve seat 10 are welded.

[0052] Further, the bottom wall of the valve cavity 11 is provided with a positioning groove 15, and the valve port piece 20 is arranged in the positioning groove 15. By arranging the positioning groove 15 on the bottom wall of the valve cavity 11, the valve port piece 20 can be accurately installed to the required position of the valve cavity 11. In other words, the positioning groove 15 can play a positioning role on the valve port piece 20, which facilitates the installation of the valve port piece 20 at the preset position, so as to ensure the coaxiality between the valve seat 10 and the valve port piece 20. Moreover, by arranging the positioning groove 15, the contact area between the valve seat 10 and the valve port piece 20 can be increased, which is conducive to firmly connecting the valve seat 10 and the valve port piece 20. Specifically, the valve seat 10 and the valve port piece 20 can be welded.

[0053] In another embodiment, as shown in FIG. 6, the valve port piece 20 and the valve seat 10 are integrally formed. Specifically, the valve port piece 20 can be machined by slotting and hole opening on the valve seat 10.

[0054] As shown in FIG. 1, the valve seat assembly 90 further comprises a guide sleeve 60, which is connected to one end of the valve seat 10 and forms the valve cavity 11 together with the valve seat 10, and the outer wall of the valve core 50 is in sealingly movable cooperation with the inner wall of the guide sleeve 60.

[0055] Optionally, in an embodiment, the transmission assembly 70 comprises a screw rod 71 and a threaded sleeve 72. The threaded sleeve 72 is arranged at the end of the guide sleeve 60 away from the valve cavity, and the threaded sleeve 72 is fixedly connected with the valve seat 10; and / or, the threaded sleeve 72 is fixedly connected with the guide sleeve 60. Specifically, the threaded sleeve 72 is sleeved on the end of the guide sleeve 60 away from the valve cavity 11 and is in transition cooperation with the outer wall of the guide sleeve 60, and the threaded sleeve 72 is fixedly connected with the valve seat 10; or, the connection mode among the threaded sleeve 72, the valve seat 10 and the guide sleeve 60 can also be that the threaded sleeve 72 is sleeved on the end of the guide sleeve 60 away from the valve cavity 11 and is fixedly connected with the guide sleeve 60, and the threaded sleeve 72 is fixedly connected with the valve seat 10; or, the connection mode among the threaded sleeve 72, the valve seat 10 and the guide sleeve 60 can also be that the threaded sleeve 72 is sleeved on the end of the guide sleeve 60 away from the valve cavity 11 and is fixedly connected with the guide sleeve 60. In other words, there are three connection modes among the threaded sleeve 72, the guide sleeve 60 and the valve seat 10, one of which is that the threaded sleeve 72 is fixed only on the valve seat 10; another is that the threaded sleeve 72 is fixed only on the guide sleeve 60; and the third is that the outer wall of the threaded sleeve 72 is fixed on the valve seat 10, and the inner wall of the threaded sleeve 72 is in transition cooperation with the outer wall of the guide sleeve 60.

[0056] In this way, the guide sleeve 60 not only can support the threaded sleeve 72, but also can guide the movement of the valve core 50, so that the screw rod 71 can drive the valve core 50 to move more stably.

[0057] The screw rod 71 is in turn arranged in the threaded sleeve 72 and the guide sleeve 60, and is threadedly connected with the threaded sleeve 72, and one end of the screw rod 71 is connected with the valve core 50. With the rotation of the screw rod 71 relative to the threaded sleeve 72, the screw rod 71 can drive the valve core 50 to move along the guide sleeve 60 towards the direction of approaching or away from the valve port 21.

[0058] Of course, the cooperation form of the screw rod 71 and the threaded sleeve 72 can also be set as that the screw rod 71 is connected to the valve seat 10 in the axial direction, the threaded sleeve 72 is limited in the circumferential direction of the valve seat 10, and the valve core 50 is connected to the threaded sleeve 72, so that the threaded sleeve 72 can drive the valve core 50 to move in the axial direction along with the circumferential rotation of the screw rod 71. In other embodiments, the transmission assembly 70 can also be configured in the manner that the moving iron core is attracted to the static iron core. As long as it can drive the valve core 50 to move towards the valve port piece 20 or away from the valve port piece 20, it is applicable. The following will take the example that the threaded sleeve 72 is fixedly connected to the one end of the guide sleeve 60 away from the valve seat 10, and the screw rod 71 drives the valve core 50 to move along the guide sleeve 60 towards the valve port 21 or away from the valve port 21, to introduce the cooperation process of the transmission assembly 70 driving the valve core 50.

[0059] Further, as shown in FIG. 5, the inner wall of the valve seat 10 is provided with a stop step 14, the guide sleeve 60 is arranged on the stop step 14, and the positioning groove 15 is coaxially arranged with the stop step 14. In this way, the coaxial arrangement of the guide sleeve 60 and the valve port piece 20 can be ensured, so that the valve core 50 can be more accurately opened or closed when moving along the inner wall of the guide sleeve 60.

[0060] Further, the outer side wall of the guide sleeve 60 is in interference fit with the inner side wall of the stop step 14. In this way, the guide sleeve 60 can be prevented from deviating, thereby further ensuring the coaxiality between the guide sleeve 60 and the valve port piece 20.

[0061] Please continue to refer to FIG. 1, the valve seat assembly 90 further comprises a sleeve 80 connected to the valve seat 10, and the transmission assembly 70 further comprises a rotor 73 movably arranged in the sleeve 80 and fixedly connected to the one end of the screw rod 71 away from the valve port piece 20, so as to drive the screw rod 71 to rotate. The rotation of the rotor 73 drives the screw rod 71 to rotate, and the screw rod 71 is in threaded cooperation with the threaded sleeve 72, so as to realize the axial movement of the screw rod 71 relative to the threaded sleeve 72 to approach or move away from the valve port piece 20.

[0062] Specifically, the sleeve 80 is connected to the valve seat 10 and surrounds the valve seat 10 to form a rotor cavity 81, and the rotor 73 is located in the rotor cavity 81. The one end of the screw rod 71 away from the valve port piece 20 penetrates the threaded sleeve 72 and is fixedly connected to the rotor 73, and the rotor 73 can drive the screw rod 71 to rotate in the circumferential direction and move in the axial direction.

[0063] As shown in FIG. 1, the valve core 50 is provided with a balance passage 51, which penetrates the one end of the valve core 50 close to the valve port piece 20 and the one end away from the valve port piece 20; when the valve core 50 moves to close the valve port 21, the balance passage 51 is communicated with the first connecting pipe 30.

[0064] When the valve core 50 closes the valve port 21 and the first connecting pipe 30 is used as an outlet pipe, the pressure at the first connecting pipe 30 is relatively small, and the pressure in the valve cavity 11 is relatively large, so that the valve core 50 is subjected to a pressure directed to the valve port 21, which requires that the screw rod 71 provides a relatively large force to the valve core 50 to overcome the pressure on the valve core 50 and move the valve core 50 away from the valve port 21. In the embodiment, the balance channel 51 is formed on the valve core 50, so that the first connecting pipe 30 communicates with the guide sleeve 60, so that the end face of the valve core 50 close to the valve port member 20 and the end face away from the valve port member 20 are subjected to the same pressure, so that the screw rod 71 can conveniently move the valve core 50 away from the valve port member 20 to open the valve port member 20.

[0065] Further, a sealing member is arranged between the valve core 50 and the guide sleeve 60, which can be arranged on the valve core 50 or the guide sleeve 60, and the inner ring of the sealing member is in contact with the valve core 50, and the outer ring of the sealing member is in contact with the guide sleeve 60. The sealing member can be a sealing ring.

[0066] Specifically, the end of the screw rod 71 close to the valve port member 20 penetrates the valve core 50, and the balance channel 51 is formed between the outer wall of the screw rod 71 and the inner wall of the valve core 50.

[0067] The application further provides a valve seat assembly processing method, and the valve seat assembly of the electric valve 100 in the above embodiment is processed by the valve seat assembly processing method. Please refer to FIGS. 2-5, and specifically, the valve seat assembly processing method comprises the following steps:

[0068] S110, respectively pre-process the valve seat 10 and the valve port member 20;

[0069] S120, install the valve port member 20 in the valve cavity 11 and fixedly connect the valve port member 20 with the valve seat 10;

[0070] S130, form the first through hole 12 on the side wall of the valve seat 10;

[0071] S140, form the interface 22 on the side wall of the valve port member 20 through the first through hole 12, and arrange the first through hole 12 and the interface 22 in a front-to-back manner;

[0072] S150, form the second through hole 13 on the side wall of the valve seat 10.

[0073] It can be understood that the valve port piece 20 is first fixedly installed into the valve cavity 11 of the valve seat 10, then the first through hole 12 is processed by punching the side wall of the valve seat 10, and then the interface 22 is processed by punching the side wall of the valve port piece 20 through the first through hole 12, so that the first through hole 12 and the interface 22 can be coaxially opposite. Therefore, during the installation of the valve port piece 20 into the valve cavity 11 of the valve seat 10, the circumferential installation angle and the axial installation angle requirements of the valve port piece 20 do not need to be considered. Thus, the precision requirement in the assembly process of the valve port piece 20 and the valve seat 10 is greatly reduced, and therefore the assembly difficulty of the valve seat 10 and the valve port piece 20 can be reduced. Moreover, during the step 150, the first through hole 12 can be taken as a reference to ensure that the second through hole 13 is coaxial with the first through hole 12.

[0074] In an embodiment, the step S110 comprises: opening the positioning groove 15 at the bottom of the valve cavity 11.

[0075] Optionally, the pre-processing mode in the step 110 is configured as bar stock pre-processing. That is, the pre-processing mode of the valve seat 10 and the valve port piece 20 is configured as bar stock pre-processing.

[0076] Optionally, in the step 120, the valve port piece 20 is welded to the valve seat 10.

[0077] The valve seat assembly processing method further comprises the following steps:

[0078] S160, processing the matching surface 211 on the inner wall of the valve port 21.

[0079] It can be understood that, since the matching surface 211 is used for sealing cooperation with the edge of the valve core 50, in order to ensure the sealing performance of the valve port 21 when it is closed, the processing precision of the matching surface 211 is relatively high. By placing the step of processing the matching surface 211 after the steps of opening the first through hole 12, the second through hole 13 and the interface 22, the deformation of the matching surface 211 caused by the influence of the installation clamp and the hole turning on the valve seat 10 and the valve port piece 20 during the punching operation can be avoided. Thus, the sealing performance of the valve port 21 when it is closed can be improved. In other embodiments, as shown in FIG. 3, in the step 110, the inner wall of the valve port piece 20 can also be preliminarily processed, as long as a processing allowance for processing the matching surface 211 in the subsequent step 160 can be reserved.

[0080] The valve seat assembly processing method further comprises the following steps:

[0081] S170, processing the stop step 14 on the valve seat 10.

[0082] It can be understood that, since the guide sleeve 60 is sleeved on the outer periphery of the valve core 50 and is used to support the valve core 50, whether the stop step 14 is machined in place will affect whether the guide sleeve 60 and the valve seat 10 are assembled in place, and then will affect the coaxiality between the valve core 50 and the valve port piece 20, and will affect whether the valve core 50 can seal the valve port 21. By placing the step of machining the stop step 14 after the steps of opening the first through hole 12, the second through hole 13 and the interface 22, the deformation of the stop step 14 caused by the influence of the installation clamp and the hole turning on the valve seat 10 and the valve port piece 20 when the valve seat 10 and the valve port piece 20 are punched can be avoided. Moreover, since the positioning groove 15 is opened at the bottom of the valve cavity 11 in step 110, when step 170 is subsequently performed, the stop step 14 can be machined with the positioning groove 15 as a reference, thereby being beneficial to guarantee the coaxiality between the guide sleeve 60 and the valve seat 10, and then guarantee the coaxiality between the valve core 50 and the valve port piece 20.

[0083] Optionally, the machining of the stop step 14 and the machining of the matching surface 211 are performed through one-time clamping. In this way, compared with the separate machining of the matching surface 211 and the stop step 14, the one-time clamping machining forming makes the positioning reference of the machining of the matching surface 211 and the stop step 14 the same, avoids the influence of clamping in the machining process, can improve the coaxiality of the matching surface 211 and the stop step 14, and thereby is beneficial to improve the coaxiality of the valve port 21 and the valve core 50.

[0084] The valve seat assembly machining method further includes the following steps:

[0085] S180, the first connecting pipe 30 is arranged in the first through hole 12 and is inserted into the interface 22;

[0086] S190, and the second connecting pipe 40 is inserted into the second through hole 13.

[0087] There is no sequence between the step 180 and the step 190, and the step 180 can be performed first, or the step 190 can be performed first; or the step 180 and the step 190 are performed simultaneously.

[0088] The valve seat assembly machining method further includes the following steps:

[0089] S200, the valve seat 10, the guide sleeve 60, the first connecting pipe 30 and the second connecting pipe 40 are integrally welded through furnace welding, and a valve seat assembly 90 is formed.

[0090] Compared with other welding methods such as flame welding, integrally welding the valve seat 10, the guide sleeve 60, the first connecting pipe 30 and the second connecting pipe 40 through furnace welding can reduce the deformation amount of the valve seat 10, the guide sleeve 60, the first connecting pipe 30 and the second connecting pipe 40.

[0091] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0092] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A valve seat assembly machining method characterized by, The valve seat assembly processing method comprises the following steps: Respectively pre-process the valve seat and the valve port piece, the valve seat has a valve cavity, one end of the valve port piece has a valve port, the valve port is used for sealing cooperation with the valve core; The valve port piece is installed in the valve cavity and fixedly connected with the valve seat, and the valve port is communicated with the valve cavity; A first through hole is formed on the side wall of the valve seat; An interface is formed on the side wall of the valve port piece through the first through hole, and the first through hole is coaxially arranged with the interface.

2. The valve seat assembly machining method of claim 1, wherein, A second through hole is formed on the side wall of the valve seat, and the second through hole is coaxially arranged with the first through hole.

3. The valve seat assembly machining method of claim 2, wherein, After the first through hole, the interface and the second through hole are processed, the valve seat assembly processing method further comprises: A matching surface is processed on the inner wall of the valve port, and the matching surface is used for sealing cooperation with the edge of the valve core.

4. The valve seat assembly machining method of claim 3, wherein, After the first through hole, the interface and the second through hole are processed, the valve seat assembly processing method further comprises: A stop step is processed on the valve seat, A guide sleeve is connected to the stop step; The guide sleeve is sleeved on the outer periphery of the valve core and is used for guiding the movement of the valve core.

5. The valve seat assembly machining method of claim 4, wherein, The stop step and the matching surface are processed by one clamping.

6. The valve seat assembly machining method of claim 4, wherein, After the matching surface and the stop step are processed, the valve seat assembly processing method further comprises: The first connecting pipe is arranged in the first through hole and inserted into the interface; The second connecting pipe is inserted into the second through hole.

7. The valve seat assembly machining method of claim 6, wherein, The valve seat, the guide sleeve, the first connecting pipe and the second connecting pipe are integrally welded by furnace welding, and a valve seat assembly is formed.

8. The valve seat assembly machining method of claim 1, wherein, During the pre-processing of the valve seat, a positioning groove is formed at the bottom of the valve cavity, and the positioning groove is used for installing the valve port piece.

9. The valve seat assembly machining method of claim 1, wherein, The pre-processing mode of the valve seat and the valve port piece is configured as a bar stock pre-processing.

10. A valve seat assembly characterized by, The valve seat assembly is processed by the valve seat assembly processing method of any one of claims 1-9.

11. An electrically powered valve characterised in that, The electric valve comprises a transmission assembly, a valve core and a valve seat assembly, the valve core is movably arranged in the valve seat, and the transmission assembly is used for driving the valve core to move towards the direction of approaching or moving away from the valve port, so as to open or close the valve port.

12. The motorized valve of claim 11, wherein, The valve seat assembly comprises a valve seat, a valve port piece, a first connecting pipe and a second connecting pipe, the valve port is formed in the valve port piece, the valve seat has a valve cavity, the valve port piece is arranged in the valve cavity, the first connecting pipe is communicated with the valve cavity from the side of the valve seat through the valve port, and the second connecting pipe is directly communicated with the valve cavity from the side of the valve seat. The transmission assembly comprises a screw rod and a threaded sleeve, the screw rod is arranged in the threaded sleeve and is threadedly connected with the threaded sleeve, and one of the screw rod and the threaded sleeve is connected with the valve core and is used for driving the valve core to move axially.

13. The motorized valve of claim 12, wherein, The first connecting pipe and the second connecting pipe are coaxially arranged.

14. The motorized valve of claim 12, wherein, The valve port and the valve core are coaxially arranged, an interface is formed on the side wall of the valve port piece, the interface is communicated with the valve port and is used for installing the first connecting pipe; and / or The inner wall of the valve port is provided with a matching surface, the matching surface is configured as a conical surface, and along the direction from the valve core to the valve port piece, the radius of the matching surface shows a decreasing trend.

15. The motorized valve of claim 12, wherein, The threaded sleeve is fixedly connected to the valve seat assembly, and the valve core is connected to the screw rod, and the screw rod can drive the valve core to move axially with the rotation of the screw rod.

16. The motorized valve of claim 15, wherein, The valve seat assembly further comprises a guide sleeve connected to one end of the valve seat and surrounding the valve seat to form the valve cavity, the outer wall of the valve core is movably and sealingly connected to the inner wall of the guide sleeve, the threaded sleeve is arranged at the end of the guide sleeve away from the valve cavity, and the threaded sleeve is fixedly connected to the valve seat; and / or the threaded sleeve is fixedly connected to the guide sleeve.

17. The motorized valve of claim 16, wherein, The inner wall of the valve seat is provided with a stop step, the guide sleeve is arranged on the stop step, and the outer side wall of the guide sleeve is in interference fit with the inner side wall of the stop step.

18. The motorized valve of claim 17, wherein, The bottom wall of the valve cavity is provided with a positioning groove, and the valve port member is arranged in the positioning groove. Alternatively, the valve port member is integrally formed with the valve seat.

19. The motorized valve of claim 18, wherein, The positioning groove and the stop step are coaxially arranged.

20. The motorized valve of claim 12, wherein, The valve core is provided with a balance channel, the balance channel penetrates one end of the valve core close to the valve port member and one end of the valve core away from the valve port member, and the balance channel is communicated with the first connecting pipe when the valve core moves to close the valve port.

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