CN110094525B

CN110094525B - Electrically operated valve and manufacturing method thereof

Info

Publication number: CN110094525B
Application number: CN201810285701.2A
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: 2018-01-31
Filing date: 2018-04-02
Publication date: 2021-07-30
Anticipated expiration: 2038-04-02
Also published as: CN110094525A

Abstract

The invention discloses an electric valve, which comprises a valve core component, wherein the valve core component comprises a valve core body and a lower stop component, the valve core body comprises a valve core sleeve and a valve core body, the valve core sleeve is fixedly connected with the valve core body, the lower stop component is arranged in an inner cavity of the valve core sleeve, the lower stop component comprises a lower stop part, an upper cavity is arranged above the lower stop part, a lower cavity is arranged below the lower stop part, the lower stop component comprises a first axial through hole communicated with the upper cavity and the lower cavity, the valve core body comprises a second axial through hole and an annular thin wall part, and the second axial through hole is communicated with the lower cavity; the nut comprises a radial protruding part arranged on the upper cavity, and the radial protruding part can be matched with the upper stop part.

Description

Electrically operated valve and manufacturing method thereof

Technical Field

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

Background

Some air conditioners, especially commercial air conditioning systems such as multi-split air conditioners and the like, need to communicate an outdoor unit with a plurality of indoor units, so that an electric valve needs to be installed on a refrigerant loop of each indoor unit for cutting off refrigerants or adjusting the flow rate. At present, the higher the requirement on the operation performance of the electric valve is, therefore, technicians are required to continuously strive to develop new technologies.

Disclosure of Invention

The invention aims to provide an electric valve, which can reduce the differential pressure force received by a valve core component and improve the action performance of the valve.

The disclosed electrically operated valve comprises a valve body component comprising a valve body comprising a first fluid port;

a valve seat member fixedly connected with the valve body member, the valve seat member comprising a valve seat body comprising a second fluid port;

the transmission component is arranged in a valve cavity of the electric valve and comprises a screw rod and a nut, and the screw rod is in threaded connection with the nut; (ii) a

The valve core component is arranged in the valve cavity and comprises a valve core body and a lower stop component;

the valve core body comprises a valve core sleeve and a valve core body, the valve core sleeve is fixedly connected with the valve core body, the valve core sleeve is approximately cylindrical, the valve core sleeve comprises an upper stop part, the lower stop part is arranged in an inner cavity of the valve core sleeve, the lower stop part comprises a lower stop part, an upper cavity is arranged above the lower stop part, a lower cavity is arranged below the lower stop part, and the lower stop part comprises a first axial through hole communicated with the upper cavity and the lower cavity; the valve core body comprises a second axial through hole and an annular thin-wall part, and the second axial through hole is communicated with the lower cavity; the nut comprises a radial protrusion part arranged on the upper cavity, and the radial protrusion part can be matched with the upper stop part so that the nut can drive the valve core component to move along the axial direction; the annular thin portion may abut against a sealing portion of the valve seat member, and a lower end portion of the nut may engage with the lower stopper portion to restrict downward movement of the nut.

The valve core component comprises a valve core body, the valve core body comprises a valve core sleeve and a valve core body fixedly connected with the valve core sleeve, the valve core body comprises a second axial through hole and an annular thin wall part, and the second axial through hole is communicated with the lower cavity, so that the pressure difference force applied to the valve core component can be reduced, the internal pressure balance of the valve is facilitated, and the action performance of the valve is improved.

The invention also discloses a manufacturing method of the electric valve, which comprises the following steps:

providing the valve core sleeve: the valve core sleeve is integrally formed by stretching a metal material or integrally formed by stamping the metal material;

providing the valve core body: the valve core body is processed by metal materials;

providing the nut and the lower stop component, firstly assembling the nut and the valve core sleeve, enabling the upper end of the nut to extend out of the valve core sleeve from the first axial through hole, and welding and fixing the valve core body and the valve core sleeve to form a first assembly component after the lower stop component is installed in the inner cavity of the valve core sleeve;

providing a valve core guide component, wherein the valve core guide component comprises a guide sleeve; (ii) a

Providing a valve body component and a valve seat component, wherein the valve body component comprises a valve body, and the valve seat component comprises a valve seat body;

welding and fixing the guide sleeve and the valve body to form a second assembly component;

assembling the first assembling component relative to the second assembling component from bottom to top, so that the nut is in threaded connection with the screw rod;

and welding and fixing the valve body and the valve seat body.

Drawings

FIG. 1: the invention provides a schematic structural diagram of an electric valve in a full-open state;

FIG. 2: the electric valve shown in fig. 1 is a schematic structural diagram in a closed valve state;

FIG. 3: a schematic structural view of a body part of the electric valve shown in fig. 1;

FIG. 4: a schematic view of the construction of the valve seat part of the electric valve shown in figure 1;

FIG. 5: a schematic view of the valve seat body of the valve seat member shown in figure 4;

FIG. 6: FIG. 4 is a schematic view of the construction of the valve port sheath of the valve seat member;

FIG. 7: the structure of the transmission part of the electric valve shown in figure 1 is schematic;

FIG. 8: a schematic view of the construction of the spool part of the electric valve shown in figure 1;

FIG. 8A: i in FIG. 8₁A partial enlargement of (a);

FIG. 8B: i in FIG. 8₁A partial enlarged view of the modified example;

FIG. 9: fig. 1 is a schematic structural view of a modified example of a valve body member of an electric valve;

FIG. 10: fig. 1 is a schematic structural view of a spool guide of the electric valve;

FIG. 11: figure 1 shows a perspective view of a nut set of an electric valve.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

It should be noted that the terms "upper" and "lower" as used herein are defined by the relative positions of the components shown in the drawings, and are used for clarity and convenience of the technical solution. It is to be understood that the directional terms used herein are not intended to limit the scope of the claims.

The axial direction is the direction from top to bottom or from bottom to top along the paper surface, namely the axial direction of the rotor and the valve core guiding component; as used herein, "radial" refers to a direction perpendicular to the axial direction. The term "opening or closing the valve port" as used herein means to allow or not to allow fluid at the valve port to pass between the axial connection pipe and the radial connection pipe. "integral" in this context means machined from one part, rather than two or more parts assembled or secured. As used herein, "thin-walled" means a wall thickness of between 0.3mm and 2.0mm, i.e., 0.3mm < M < 2.0mm if wall thickness is defined as M.

FIG. 1 shows an electrically operated valve provided by the present invention in a fully open stateFig. 2 is a schematic structural view of the electric valve shown in fig. 1 in a closed valve state, fig. 3 is a schematic structural view of a valve body part of the electric valve shown in fig. 1, fig. 4 is a schematic structural view of a valve seat part of the electric valve shown in fig. 1, fig. 5 is a schematic structural view of a valve seat body of the valve seat part shown in fig. 4, fig. 6 is a schematic structural view of a valve port sheath of the valve seat part shown in fig. 4, fig. 7 is a schematic structural view of a transmission part of the electric valve shown in fig. 1, fig. 8 is a schematic structural view of a valve core part of the electric valve shown in fig. 1, and fig. 8A is a schematic structural view of I in fig. 8₁A partial enlarged view of (A), FIG. 8B is I in FIG. 8₁Fig. 10 is a schematic structural view of a spool guide of the electric valve shown in fig. 1, and fig. 11 is a perspective view of a nut set of the electric valve shown in fig. 1. The dashed and solid arrows in fig. 1 and 2 indicate that the electric valve of the present invention can achieve bidirectional flow.

As shown in fig. 1 to 3, the electric valve of this embodiment includes a valve core member 10, a valve seat member 20, a transmission member 30, a valve body member 40, a nut set 50, a valve core guide member 60, and a coil member 70. The valve body part 40 includes a valve body 41 and a valve cover 42, which are fixedly welded. The outer periphery of the valve body 40 is provided with a coil component 70, and specifically, the coil component 70 is sleeved on the outer periphery of the valve cover 42 and fixedly connected with the valve body 40 through a bracket 44.

The valve body 41 has a substantially cylindrical structure, and can be manufactured by pressing, rolling, drawing, or extrusion, and particularly, by drawing or rolling, the wall of the valve body 41 can be made thin, and the valve body can be easily processed with a reduced material consumption. The valve body 41 includes an upper cylinder portion 41a, an intermediate cylinder portion 41b, and a lower cylinder portion 41c, and a first fluid port 401 is opened in a side wall of the lower cylinder portion 41 c. The diameter of the outer edge of the upper cylinder part 41a of the three cylinder parts is the smallest, the diameter of the outer edge of the lower cylinder part 41c is the largest, and the arrangement is more convenient for installing functional parts inside and welding and installing parts outside, so that the structure is more compact. The diameters of the outer edges of the middle cylinder part 41b and the lower cylinder part 41c can be consistent on the premise of meeting the assembly requirement.

The radial adapter 43 is welded and fixed to the lower cylindrical portion 41c of the valve body 41. The valve cover body 42 is welded and fixed to the outer wall of the middle cylindrical portion 41b of the valve body 41, and the upper end of the upper cylindrical portion 41a of the valve body 41 extends into the valve cover body. It will be appreciated that the valve housing 42 may also be indirectly secured to the valve body 41 by a welded joint. The following welding means for other components may also adopt an indirect fixing method, and will not be described herein.

As shown in fig. 1 and 4 to 6, the valve seat member 20 includes a valve seat body 21, a valve seat core 22, and a valve port cover 24. The valve seat body 21 penetrates axially, the upper end of the valve seat body 21 includes a valve port 200, and the lower end of the valve seat body 21 includes a second fluid port 201. The outer wall of the valve seat body 21 is provided with an outer step portion 213 having a step surface facing the lower cylindrical portion 41c of the valve body 41, and the lower cylindrical portion 41c of the valve body 41 abuts against the step surface of the outer step portion 213 and is fixed to the valve seat body 21 by welding to form a valve chamber 416.

The center of the valve seat body 21 includes a second axial through hole 216, the inner wall of which is provided with an upper stepped portion 217 with an upward facing step, the valve seat core 22 is provided on the upper stepped portion 217, and the valve seat core 22 may be made of a non-metal soft material, for example, a plastic material, which is easy to ensure sealing performance with the valve core member 10 made of metal (steel plate in this embodiment). The valve seat core 22 is approximately in a shape of a Chinese character 'tu' with a through hole, the cross section of the valve seat core 22 is in a circular ring shape, the valve seat core 22 comprises a circular ring-shaped base part 221 and a circular ring-shaped protruding part which extends upwards relative to the upper end surface of the base part 221, the outer diameter of the protruding part is smaller than that of the base part, and the upper end surface of the protruding part forms a sealing part 222. The seal portion 222 and the base portion 221 form a stepped portion, the valve seat pressing piece 25 is provided on the stepped portion, and the boss portion 214 is formed at the upper end portion of the valve seat body 21 when the valve seat body 21 is processed (the boss portion 214 is in a state before caulking shown in fig. 1). When the product is assembled, the valve port pressing sheet 25 is abutted against the step part of the valve seat core 22 through the riveting pressing convex part 214, so that the valve seat core 22 is installed and positioned. The valve port sheath 24 is disposed inside the valve seat core 22, and further ensures the installation and positioning of the valve seat core 22 together with the valve port pressing sheet 25.

As shown in fig. 6, the valve port sheath 24 is a ring-shaped metal thin-wall cylinder, and can be processed by drawing, rolling or stamping, and the process is simple. The valve port cover 24 includes a cylindrical portion 243 and a flange portion 244 formed by flanging, the flange portion 244 abuts against the stepped surface of the lower stepped portion 212, the upper end portion of the axial connection pipe 23 directly abuts against the flange portion 244, and the axial connection pipe 23, the valve port cover 24, and the valve seat body 21 can be welded and fixed. In the present embodiment, the cylindrical portion 243 of the valve port cover 24 is provided with a balance hole 241 communicating with the inner cavity of the valve port cover 24 as a balance passage at a position corresponding to the step surface of the upper step portion 217. The arrangement has the advantages that in the operation process of the electric valve, a part of medium enters and remains between the bottom of the valve seat core 22 and the step surface of the upper step part 217 of the valve seat body 21, when the electric valve is opened and closed, the valve seat core 22 can be separated from the valve seat body 21 due to abnormal fluctuation impact such as medium instant vaporization and the like caused by instant pressure change, and the product is failed. The purpose of forming the balance hole 241 can enable the medium at the bottom of the valve seat core 22 to be communicated with the inner cavity of the axial connecting pipe 23, so that the pressure relief effect is achieved, and the situations can be avoided. Alternatively, the valve port cover 24 may be a two-piece structure, in which the cylindrical portion 243 and the flange portion 244 are fixedly connected by welding or the like.

In the structure, the parts are compactly installed and matched, the mutual position precision can be ensured, the process is simple, and the product reliability is high.

The transmission member 30 is disposed in the valve cavity 416 and includes a lead screw 31, a nut 32 and a magnetic rotor 34. The screw 31 is not displaced relative to the valve body member 40 in the axial direction. The magnetic rotor 34 is fixedly connected to the lead screw 31 by a connecting piece 35, and the lower end portion of the lead screw 31 extends from the upper end portion of the valve body 41 into the valve body 41 and is screw-engaged with the nut 32. When the valve body member 10 moves axially relative to the valve seat member 20, the magnetic rotor 34 and the lead screw 31 do not move axially relative to the valve body 41, and the stability of the operation is improved during the operation.

The nut 32 includes a radial protrusion 321 that supports the valve core component 10 to drive the valve core component 10 to move axially upward, and the nut 32 can drive the valve core component to move axially. Because the magnetic rotor 34, the screw rod 31, the valve body component 40 and the coil component 70 do not generate relative displacement in the axial direction, when the magnetic rotor 34 rotates under the driving force of the coil component 70, the screw rod 31 rotates circumferentially along with the magnetic rotor 34, the circumferential rotation of the screw rod 31 is converted into the axial movement of the nut 32, and therefore the nut 32 can drive the valve core component 10 to move up and down in the axial direction, so as to open or close the electric valve.

In order to move the nut 32 only in the axial direction without rotating it in the circumferential direction, as shown in fig. 1, a nut kit 50 fitted to the nut 32 is provided between the valve body 41 and the nut 32, and the nut kit 50 and the valve body 41 are welded and fixed. The outer peripheral wall of the portion of the nut 32 that engages with the nut set 50 is a columnar structure having a non-circular cross section. As shown in fig. 11, the nut set 50 includes a nut limiting portion 51 that cooperates with the nut 32 to limit the rotation of the nut 32, and further includes a spool limiting portion 52 that limits the upward movement stroke of the spool member 10, and the nut 32 drives the spool member 10 to move axially upward until the spool member 10 abuts against the spool limiting portion 52, so that the spool member 10 cannot move upward any more. Specifically, in the present embodiment, the nut set 50 is a thin-walled metal cylinder, and can be made by pressing and crimping a sheet material. In this embodiment, there are 4 plates 51 formed by punching and bending inward from the side wall of the thin-walled cylindrical member, and the plates 51 serve as nut restricting portions, and the inner wall portions thereof are engaged with the outer edge portions of the nuts 32, so that the circumferential rotation of the nuts 32 can be restricted (it will be understood that the restricting effect can be achieved if only one or two rib plates are provided). An area 53 is formed between the upper end surface of the plate 51 and the inner wall surface of the nut member 50, and serves as a housing portion for the bearing 33, the bearing 33 is disposed in contact with the upper end portion of the plate 51, the bearing 33 is axially positioned, and the upper end portion of the nut member 50 is swaged inward to fix the bearing 33. The lower end 52 of the nut kit 50 serves as a spool member regulating portion. During the upward movement of the valve core component 10 carried by the nut 32, the lower end 52 of the nut sleeve 50 can be abutted to limit the axial movement stroke of the valve core component 10. In the large-flow electric valve, the screw rod and the nut are connected in a non-self-locking threaded manner, and the valve core component 10 is abutted to avoid hidden troubles such as blocking.

In order to ensure that the valve core component 10 does not shift axially during the axial movement with the nut 32, a valve core guiding component 60 which is fixedly connected with the valve body component 40 and guides the valve core component 10 is arranged in the valve cavity 416. The spool guide member 60 includes a guide sleeve 61.

In specific setting, the guide sleeve 61 is a cylindrical structure with a small top and a large bottom, and is welded and fixed with the inner wall of the middle cylindrical portion 41b of the valve body 41, and includes a guide section 612 that is in guide fit with the valve core component 10 to guide the valve core component, and an installation section 613 located below the guide section 612, and the inner diameter of the guide section 612 is smaller than that of the installation section 613. Specifically, the inner wall of the guide sleeve 612 can be in clearance fit with the outer wall of the valve core sleeve 12, and the inner wall of the guide section 612 serves as a guide surface to specifically guide the valve core component 10. A seal assembly is disposed between the inner wall of the mounting section 613 and the outer wall of the spool sleeve 12. Specifically, the seal assembly includes a seal member and a lower retainer 64. The sealing means comprise a seal ring 62 made of wear-resistant material and a slide 63 made of rubber material. A first positioning step part 611 is formed between the guide section 612 and the mounting section 613, the inner wall of the mounting section 613 further includes a second positioning step part 615 with a downward step, and the sealing member is positioned by the first positioning step part 611. In this concrete scheme, lower limiting member 64 specifically is the gasket, and the lower extreme of uide bushing 61 and gasket 64 welded fastening carry out axial spacing to seal assembly, perhaps also can the lower extreme riveting gasket 64 of uide bushing 61 carry out axial spacing to seal assembly. The upper end surface of the lower retainer 64, the outer wall of the valve core sleeve 12 and the inner wall of the mounting section 613 form the accommodating space 1, the sealing member is disposed in the accommodating space 1, and is axially retained between the first positioning step portion 611 and the lower retainer 64 by the lower retainer 64 in the axial direction, and the sealing member elastically abuts between the outer wall of the valve core body 11 and the inner wall of the mounting section 613 of the guide sleeve 61. The sealing assembly ensures that the first fluid port 401 and the second fluid port 201 of the electric valve do not communicate through the valve port 200 when the electric valve is in the fully closed state.

The construction of the spool part 10 will be described in detail below. The valve core member 10 is disposed in the valve cavity 416 in clearance fit with the inner wall 65 of the guide section 612 of the guide sleeve 61. The spool component 10 can abut against or separate from the valve seat core 22 to open or close the valve port 200, and to connect or disconnect the first fluid port 401 and the second fluid port 201.

The valve core component 10 includes a valve core body and a lower stop component, and the valve core body includes a valve core body 11 and a cylindrical valve core sleeve 12 welded and fixed with the valve core body 11. The valve core sleeve 12 includes an upper stop portion, and the radial protrusion 321 of the nut 32 can cooperate with the upper stop portion, so that the nut 32 can drive the valve core component 10 to move axially. The lower stop member is disposed in the inner cavity 101 of the valve core sleeve 12, the lower stop member includes a lower stop portion, the upper portion of the lower stop portion includes an upper cavity, the lower portion of the lower stop portion includes a lower cavity, specifically, the lower stop portion divides the inner cavity 101 into an upper cavity 2 and a lower cavity 3, the lower stop member includes a first axial through hole 4 communicating with the upper cavity 2 and the lower cavity 3, the valve core body 11 includes a second axial through hole 216 communicating with the lower cavity 3, the valve core body 11 further includes an annular thin-wall portion 112, when the annular thin-wall portion 112 abuts against the sealing portion 222 of the valve seat core 22, the first fluid port 401 is not communicated with the second fluid port 201, and the lower end portion of the nut 32 can cooperate with the lower stop portion to limit the downward movement of the nut. The provision of the annular thin portion 112 enables fluid to flow relatively quickly between the valve core member 10 and the valve seat member 20, reduces the differential pressure force applied to the valve core member 10, and improves the valve operating performance.

The valve core body comprises a valve core sleeve 12 and a valve core body 11 which are fixedly connected, the valve core sleeve 12 and the valve core body 11 can respectively adopt the same or different processing technologies, for example, the valve core sleeve 12 can be stretched by adopting a metal material or formed by punching the metal material, the valve core body 11 can adopt a processing technology comprising lathing so as to process each step part, in addition, a lower stop component arranged in an inner cavity 101 of the valve core sleeve 12 divides the inner cavity 101 into an upper cavity 2 and a lower cavity 3, and the upper cavity 2 and the lower cavity 3 are communicated through a first axial through hole 4 of the lower stop component, further, the valve core body 11 comprises an annular thin wall part which is abutted against or separated from a sealing part, when fluid flows between the annular thin wall part 112 and a valve seat component 10, because the stressed area of the annular thin wall part is very small, the stress of the annular thin wall part 112 is small, which is beneficial to the internal balance of the valve core part, the performance of the valve can be improved. Further, when the valve is in the open state and fluid flows between the first fluid port 401 and the second fluid port 201, the fluid passes relatively quickly between the lower end portion 100 of the annular thin portion 112 and the valve seat member 20, and differential pressure fluctuations when the fluid flows through this portion are reduced, and the contact surface between the annular thin portion 112 and the valve seat core 22 can be made small, thereby improving the sealing performance of the valve.

As shown in fig. 2 and 8, in the present embodiment, the valve core sleeve 12 is a cylindrical structure that penetrates up and down, and the valve core sleeve 12 is formed by stretching a metal material or integrally forming the metal material, specifically, in the present embodiment, the valve core sleeve 12 is formed by stamping a welded steel pipe or stretching a steel plate, which can conveniently set the wall thickness of the valve core sleeve 12 to be thin, thereby reducing the overall weight of the valve. In order to simplify the processing technology, the processing technology can be integrally processed, the processing technology is simpler, and the cost is saved. The valve body cover 12 includes a straight tube portion 122 and a lateral bent portion 121 substantially perpendicular to the straight tube portion, and a lower end surface portion of the lateral bent portion 121 forms an upper stopper portion of the present embodiment. The traverse bend 121 comprises a third axial through hole 15, and the nut 32 is arranged through the third axial through hole 15, i.e. one end of the nut 32 is located below the third axial through hole 15 and the other end is located above the third axial through hole 15. A gap is provided between the outer wall of the nut 32 and the hole wall of the third axial through hole 15, and after the annular thin portion 112 and the seal portion 222 come into contact, the nut 32 can continue to move downward relative to the third axial through hole 15 and come into contact with the lower stopper member.

The lower stop component is arranged in the valve core sleeve 12 and does not move relative to the valve core sleeve 12 in the axial direction. The lower stop member is a split structure including a support member 17 and a stopper 18. The supporting member 17 is a tubular structure with an upper opening and a lower opening, and can be formed by drawing and forming a metal thin-wall material or by punching and forming a metal thin-wall pipe. The support member 17 is supported by the valve core body 11, the outer wall of the support member 17 is matched with the inner wall of the valve core sleeve 12, and the wall thickness of the support member 17 can be the same as that of the valve core sleeve 12. The upper end surface of the support 17 abuts against the stopper 18. The stop 18 is a plate-like structure with a first axial through hole 4, which is supported by the support 17. The upper end surface of the stopper 18 forms a lower stopper 181. The processing of the supporting member 17 and the blocking member 18 is also material-saving, does not need to be welded with other parts, and is convenient to assemble.

The lower stop member may be an integrated structure, and as shown in fig. 9, it is a schematic structural view of a modified example of the valve body member of the electric valve shown in fig. 1. The valve core component of this modification is different from the valve core component shown in fig. 8 in that the lower stopper component is an integral structure, and reference can be made to fig. 8 for the marks of accessories other than the lower stopper component. In this embodiment, the lower stopper member of the valve body member 10A is formed in a cylindrical shape that penetrates substantially in the axial direction, and may be integrally formed by drawing a metal material or integrally formed by punching a metal material, and includes a side wall portion 17A and a bottom wall portion 18A substantially perpendicular to the side wall portion 17A, a lower end surface portion of the side wall portion 17A abuts against an upper end surface portion of the valve body 11, the bottom wall portion 18A is provided with a first axial through hole 4A, and an upper end surface portion of the bottom wall portion 18A forms a lower stopper portion. The integrated processing is more convenient.

According to the above structural design, the valve core component includes a balance flow path, which includes the annular thin-wall portion 112, the second axial through hole 216 of the valve core body 11, the lower cavity 3, the first axial through hole 4, the upper cavity 2, and the third axial through hole 15. In the closed state of the valve shown in fig. 2, the balanced flow path can communicate the valve port 200 with the space above the valve core component 10, which is beneficial to the balance of the up-and-down pressure of the valve core component 10 and the reduction of the pressure difference applied during the axial movement of the valve core component 10.

Further, in order to further improve the sealing performance when the valve is closed, the lower end portion 100 of the annular thin-walled portion 112 may have a circular arc structure as shown in fig. 8A. The bottom end 102 of the circular arc structure is in contact with or separated from the sealing portion 222 to reduce the contact area of the lower end 100 of the annular thin-walled portion 112 and the sealing portion 222 of the valve seat core 22. Furthermore, the valve core 11 may be designed to have a structure with a thin upper part and a thick lower part, and includes an upper section 111, a middle section 113 and a lower section, wherein the cross sections of the upper section 111, the middle section 113 and the lower section are all substantially circular rings, the outer diameter of the upper section 111 is smaller than that of the middle section 113, and the outer diameter of the middle section 113 is smaller than that of the lower section. The outer wall of the upper section 111 and the outer wall of the middle section 113 form a third positioning step 115 with an upward step for matching with the lower end of the valve core sleeve 12. The lower section includes the aforementioned annular thin-walled portion 112. The outer diameter of the valve core sleeve 12 is the same as the outer diameter of the middle section 113, and the horizontal projection of the outer wall of the valve core sleeve 12 is approximately coincident with the circular line where the bottom end 102 of the circular arc structure is located. The diameter of the circle defining the bottom end 102 of the circular arc structure is D2, the diameter of the outer wall of the valve core sleeve 12 is D1, and the design D1 is equal to or approximately equal to D2, namely, the projection of the outer wall of the valve core sleeve 12 in the horizontal direction can be approximately overlapped with the circular line of the bottom end of the circular arc structure, so that the pressure difference of fluid received at the lower end part 100 of the annular thin-wall part 112 is reduced as much as possible, the valve opening and closing actions are smoother, and the valve opening and closing are easy.

Alternatively, the lower end 100 of the annular thin-walled portion 112 may be a truncated cone structure with a diameter gradually decreasing toward the valve port 200 (i.e., with a large upper portion and a small lower portion) as shown in fig. 8B, and the lower end thereof includes an annular sealing plane 102 ', and the annular sealing plane 102' can contact with or separate from the valve seat core 22. The projection of the outer wall of the valve core sleeve 12 in the horizontal direction is approximately coincident with the central circular line of the annular sealing plane 102'. That is, the projection of the outer wall of the valve core sleeve 12 on the annular sealing plane 102 'is defined as a sealing ring X, the diameter thereof is defined as D3, the diameter of the outer ring line Y defining the annular sealing plane 102' is defined as D4, and the diameter of the inner ring line Z is defined as D5, then D3 is equal to or approximately equal to one-half of D4-D5, that is, D3 is (D4-D5)/2, or D3 is (D4-D5)/2, which also serves to reduce the pressure difference of the fluid received at the lower end 100 of the annular thin-walled portion 112, so that the opening and closing operations are smoother, and the opening and closing operations are easy.

In order to filter the fluid in the valve, a fourth positioning step 114 facing upward is formed by the inner wall of the upper stage part 111 and the inner wall of the middle stage part 113, and the filter member 13 is mounted on the fourth positioning step 114.

The electric valve can realize bidirectional circulation, and fluid can flow in from the radial connecting pipe 43 and flow out from the axial connecting pipe 23, and can also flow in from the axial connecting pipe 23 and flow out from the radial connecting pipe 43.

The following description will take an example in which the fluid flows in from the radial direction connecting pipe 43 and flows out from the axial direction connecting pipe 23. The magnet rotor 34 is driven by the electromagnetic coil to rotate clockwise and also to rotate counterclockwise, so as to drive the nut 32 to move up and down along the axial direction. It can be set that the valve core component 10 tends to move toward the valve port 200 when the magnetic rotor 34 rotates clockwise, and the valve core component 10 moves away from the valve port 200 when the magnetic rotor 34 rotates counterclockwise. When the electrically operated valve is in the fully opened state shown in fig. 1, the valve core member 10 is restricted by the valve core restriction portion 52 and cannot move axially upward, the electromagnetic coil 70 is energized to rotate the magnetic rotor 34 clockwise, the circumferential rotation of the magnetic rotor 34 is converted into the axial movement of the nut 32 through the rotation of the lead screw 31, so that the valve core member 10 is driven by the nut 32 to move downward, the lower end of the lower extension portion 322 of the nut 32 abuts against the lower stop portion 181, and the lower end portion 100 of the annular thin-walled portion 112 closes the valve port 200, that is, the electrically operated valve is in the valve closing state. During the operation of the electric valve, after the electric valve is powered off, the torque of the magnetic rotor is transmitted to the nut 32 and the valve body member 10 through the screw 31, thereby maintaining the position of the valve body member 10 and closing the valve. However, in the actual operation of the electric valve, due to vibration and the like, the transmission threads of the screw 31 and the nut 32 may slip, and the locking force transmitted from the screw 31 to the nut 32 and the valve body member 10 may fail, thereby failing to effectively close the valve and causing a leakage problem.

To avoid this problem, the nut 32 further includes a lower extension 322 disposed in the upper chamber 2, the lower extension 322 is annular, an axial gap is provided between a lower end of the lower extension 322 and the lower stopper 181, the elastic element 33 is disposed on an outer circumferential portion of the lower extension 322, when the annular thin-walled portion 112 is separated from the sealing portion 222, one end of the elastic element 33 is separated from the lower stopper 181, when the annular thin-walled portion 112 is abutted against the sealing portion 222, a lower end surface portion of the lower extension 322 is abutted against the lower stopper 181, and the elastic element may be a spring plate or an O-ring. In the embodiment, the spring plate is taken as an example, when the transmission screw thread slips, the elastic force of the spring plate can ensure that the electric valve closes at the moment.

The following describes a method of manufacturing the motor-operated valve of the present embodiment.

Step A10: processing a metal plate or a metal pipe to prepare a cylindrical valve body 41;

the valve body 41 may be manufactured by a method of drawing a metal plate or a method of punching/rolling/pressing a metal pipe (it should be noted that the metal plate is manufactured by drawing a metal plate into a cylindrical structure, the metal pipe is manufactured by punching/rolling a metal pipe into a cylindrical structure, and the pressing/punching/rolling/pressing shaping may be combined during a specific manufacturing process, so that the manufacturing cost and the material cost may be reduced compared to metal cutting).

A positioning step surface to be fitted to the valve seat member 20 and a positioning surface to be fitted to the valve cover body 42 are formed on the inner edge and the outer edge of the valve main body 41 by a metal cutting method, respectively.

The operation can adopt one-time clamping and positioning, so that the relative position and the form and position precision of each positioning step surface are ensured, after subsequent welding and installation, the matching precision of each component can be ensured, the running stability of the valve core component can be good, the product reliability is improved, and the description is omitted.

Step A20:

fixedly welding the nut sleeve 50 with the inner edge of the valve body 41; the guide sleeve 61 of the valve body guide member 60 is welded and fixed to the inner edge of the cylindrical portion 41b of the valve body 41, and a seal assembly is attached to the guide sleeve 61.

Since the nut sleeve 50 and the guide sleeve 61 are welded to the valve body 41, the relative positional accuracy can be ensured. The accuracy of the relative positions of the nut kit 50, the guide sleeve 61, and the valve body 41 is further improved. The nut sleeve 50 and the guide sleeve 61 can also be welded on the valve body 41 by adopting a one-off method, so that the accuracy is prevented from being influenced by heat.

Step A30:

providing the valve core sleeve 12: the valve core sleeve 12 is processed through metal material stretching forming or metal material punch forming;

providing the valve core body 11: the valve seat body 11 is made of metal materials;

providing the nut 32 and the lower stopping component, firstly assembling the nut 32 with the valve core sleeve 12, extending the upper end of the nut 32 out of the valve core sleeve 12 from the third axial through hole 15, and welding and fixing the valve core body 11 and the valve core sleeve 12 after the lower stopping component is installed in the inner cavity 101 of the valve core sleeve 12 to form a first assembling component.

Step A40: the lower end part of the screw rod 31 of the transmission component 30 is extended into the valve body from the end part of the upper cylinder part 41a of the valve body 41;

assembling the nut 32 of the transmission component 30 with the valve core component 10, and installing the assembled assembly into the valve cavity 416 from the lower cylinder part of the valve body 41, wherein the nut 32 is in threaded connection with the screw rod 31; the nut 32 is engaged with the restricting portion of the nut sleeve 50, the guide sleeve 61 is in clearance fit with the valve body member 10, and the seal assembly elastically abuts against the outer edge of the valve body member 10.

It will be appreciated that since the nut sleeve 50 and the guide sleeve 61 are welded to the valve body 41, the relative positional accuracy can be ensured. The transmission component 30 and the valve core component 10 are higher in installation accuracy, so that the valve core is driven stably.

Step A50:

and assembling the first assembling component relative to the guide sleeve from bottom to top, so that the nut is in threaded connection with the screw rod.

Step A60:

providing a valve seat member: mounting the valve seat core 22 on the valve seat body 21, sleeving the valve port sheath 24 on the inner edge surface of the valve seat core 22, wherein the flange part 244 of the valve port sheath 24 is abutted against the lower step part 212 of the valve seat body 21, and the end part of the axial connecting pipe 23 is abutted against the flange part 244; the axial connection tube 23 is fixed to the valve seat body 21 by welding.

Step A70:

welding and fixing the valve cover body 42 and the valve body 41; the valve body 41 and the valve seat body 21 are welded and fixed.

Step A80:

the solenoid coil 70 is sleeved on the outer edge of the valve housing 42, and the solenoid coil 70 is fixed on the fixing frame 44.

It should be understood by those skilled in the art that the above-mentioned step numbers a10-a80 are introduced for convenience of description, and do not represent the sequence relationship between the steps, and based on the technical idea of the present invention, a variety of assembling sequences and assembling variations can be extended based on the above-mentioned technical solution.

The electric valve provided by the invention is described in detail in the embodiment. The electric valve provided by the invention improves the valve core component, the valve core component comprises a valve core body, the valve core sleeve 12 and the valve core body 11 can respectively adopt the same or different processing technologies, for example, the valve core sleeve 12 can adopt metal material stretching or metal material stamping, the valve core body 11 can adopt the technology including lathing, so as to process each step part, and the lower stop component arranged in the inner cavity 101 of the valve core sleeve 12 divides the inner cavity 101 into the upper cavity 2 and the lower cavity 3, and the upper cavity 2 and the lower cavity 3 are communicated through the first axial through hole 4 of the lower stop component, further, the valve core body 11 comprises an annular thin wall part which is abutted to or separated from the sealing part, when fluid flows between the annular thin wall part 112 and the valve seat component 20, because the stressed area of the annular thin wall part is very small, the stress of the annular thin wall part 112 is small, which is beneficial to the internal balance of the valve core component, the valve opening and closing performance of the valve can be improved. Further, when the valve is in the open state and fluid flows between the first fluid port 401 and the second fluid port 201, the fluid passes relatively quickly between the lower end of the annular thin portion 112 and the valve seat member 20, and differential pressure fluctuations when the fluid flows through this portion are reduced, and the contact surface between the annular thin portion 112 and the valve seat core 22 can be made small, thereby improving the sealing performance of the valve.

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. An electrically operated valve comprising:

a valve body component comprising a valve body including a first fluid port;

the transmission component is arranged in a valve cavity of the electric valve and comprises a screw rod and a nut, and the screw rod is in threaded connection with the nut;

the valve core body comprises a valve core sleeve and a valve core body, the valve core sleeve is fixedly connected with the valve core body, the valve core sleeve is approximately cylindrical, the valve core sleeve comprises an upper stop part, the lower stop part is arranged in an inner cavity of the valve core sleeve, the lower stop part comprises a lower stop part, an upper cavity is arranged above the lower stop part, a lower cavity is arranged below the lower stop part, and the lower stop part comprises a first axial through hole communicated with the upper cavity and the lower cavity; the valve core body comprises a second axial through hole and an annular thin-wall part, and the second axial through hole is communicated with the lower cavity; the nut comprises a radial protruding part arranged on the upper cavity, and the radial protruding part can be matched with the upper stop part so that the nut can drive the valve core component to move along the axial direction; the annular thin portion may abut against a sealing portion of the valve seat member, and a lower end portion of the nut may engage with the lower stopper portion to restrict downward movement of the nut.

2. The electric valve according to claim 1, wherein the lower stop member is a split structure, and comprises a support member and a stopper, the support member is substantially in a shape of a circular tube, the support member is formed by stretching or punching a metal material, an outer wall of the support member is fitted to an inner wall of the valve core sleeve, an upper end surface of the support member abuts against the stopper, a lower end surface of the support member abuts against an upper end surface of the valve core, the stopper comprises the first axial through hole, and the upper end surface of the stopper forms the lower stop portion.

3. The electric valve according to claim 1, wherein the lower stopper member is of an integral structure, the lower stopper member is of a cylindrical shape that penetrates in a substantially axial direction, the lower stopper member is formed by drawing or press-molding a metal material, the lower stopper member includes a side wall portion and a bottom wall portion that is substantially perpendicular to the side wall portion, a lower end surface portion of the side wall portion abuts against an upper end surface portion of the valve body, the bottom wall portion is provided with the first axial through hole, and an upper end surface portion of the bottom wall portion forms the lower stopper portion.

4. The electrically operated valve according to claim 1, wherein the valve core housing is integrally formed by drawing a metal material or integrally formed by punching a metal material, the valve core housing includes a straight cylinder portion and a lateral bent portion substantially perpendicular to the straight cylinder portion, a lower end surface portion of the straight cylinder portion is welded to the valve core body, a lower end surface portion of the lateral bent portion forms the upper stopper portion, the lateral bent portion includes a third axial through hole, the third axial through hole communicates with the upper chamber, and the nut is disposed through the third axial through hole.

5. The electric valve according to claim 1, wherein the nut further comprises a lower extension, the lower extension is substantially annular, an axial gap is provided between a lower end of the lower extension and the lower stop portion, an elastic element is provided at an outer peripheral portion of the lower extension, when the annular thin-walled portion is separated from the sealing portion, one end of the elastic element abuts against the radial protrusion portion, the other end abuts against the lower stop portion, and when the annular thin-walled portion abuts against the sealing portion, a lower end surface portion of the lower extension abuts against the lower stop portion.

6. The electrically operated valve according to any one of claims 1 to 5, further comprising a spool guide member, wherein the spool guide member is disposed in the valve chamber, and the spool guide member comprises a guide sleeve fixedly connected to the valve body member; the guide sleeve is roughly cylindrical and comprises a guide section and an installation section, the inner diameter of the guide section is smaller than that of the installation section, the inner wall of the guide section is in clearance fit with the outer wall of the valve core sleeve, and a sealing assembly is arranged between the inner wall of the installation section and the outer wall of the valve core sleeve.

7. The electric valve according to claim 6, wherein the sealing assembly comprises a sealing member and a lower limiting member, the lower limiting member is substantially annular, the guiding section and the mounting section form a first positioning step part with a downward step surface, the inner wall of the mounting section comprises a second positioning step part with a downward step surface, the lower limiting member abuts against the first positioning step part, the lower end part of the guiding sleeve is riveted or welded with the lower limiting member, an accommodating space is formed by the upper end surface of the lower limiting member, the outer wall of the valve core sleeve and the inner wall of the mounting section, the sealing member is disposed in the accommodating space, and the sealing member elastically abuts between the inner wall of the mounting section and the outer wall of the valve core sleeve.

8. The electric valve according to any one of claims 1 to 5, wherein the valve seat member includes a valve seat body fixedly connected to the valve body member and a valve seat core fixedly connected to the valve seat body, the valve seat core is made of a plastic material, the valve seat core includes an annular base portion and an annular protrusion portion extending upward from an upper end portion of the base portion, an outer diameter of the protrusion portion is smaller than an outer diameter of the base portion, an upper end surface portion of the protrusion portion forms the sealing portion, a lower end portion of the annular thin-walled portion has an arc structure, and a bottom end of the arc structure can abut against or be separated from the sealing portion.

9. The electric valve according to claim 8, wherein the valve core body comprises an upper section, a middle section and a lower section, the cross sections of the upper section, the middle section and the lower section are all substantially circular, the outer diameter of the upper section is smaller than that of the middle section, the outer diameter of the middle section is smaller than that of the lower section, the upper section and the middle section form a third positioning step with an upward step surface, the lower section comprises the annular thin wall, the outer diameter of the valve core sleeve is the same as that of the middle section, the lower end of the valve core sleeve is matched with the third positioning step, and the projection of the outer wall of the valve core sleeve in the horizontal direction is substantially coincident with the circular line where the bottom end of the circular arc structure is located.

10. The electric valve according to any one of claims 1 to 5, wherein the valve seat member includes a valve seat body fixedly connected to the valve body member and a valve seat core fixedly connected to the valve seat body, the valve seat core is made of a plastic material, the valve seat core includes an annular base portion and an annular protrusion extending upward from an upper end portion of the base portion, an outer diameter of the protrusion is smaller than an outer diameter of the base portion, an upper end surface portion of the protrusion forms the sealing portion, a lower end portion of the annular thin-walled portion has a circular truncated cone structure with a large upper portion and a small lower portion, a lower end surface of the circular truncated cone structure forms an annular sealing plane, and the annular sealing plane can abut against or be separated from the sealing portion.

11. The electric valve according to claim 10, wherein the valve core body comprises an upper section, a middle section and a lower section, the cross sections of the upper section, the middle section and the lower section are all substantially circular, the outer diameter of the upper section is smaller than that of the middle section, the outer diameter of the middle section is smaller than that of the lower section, the upper section and the middle section form a third positioning step with an upward step surface, the lower section comprises the annular thin wall, the outer diameter of the valve core sleeve is the same as that of the middle section, and the horizontal projection of the outer wall of the valve core sleeve is substantially coincident with the central circular line of the annular sealing plane.

12. The electric valve according to any one of claims 1 to 5, wherein the valve core body comprises an upper section, a middle section and a lower section, the cross sections of the upper section, the middle section and the lower section are all substantially circular, the outer diameter of the upper section is smaller than that of the middle section, the outer diameter of the middle section is smaller than that of the lower section, the upper section and the middle section form a third positioning step part with an upward step surface, the lower end surface of the valve core sleeve is matched with the third positioning step part, the lower section comprises the annular thin wall part, the inner wall of the upper section and the inner wall of the middle section form a fourth positioning step part with an upward step surface, and a filter element is mounted on the fourth positioning step part.

13. A method of manufacturing an electrically operated valve as claimed in any one of claims 1 to 12, said method comprising the steps of:

providing the valve core guide component, wherein the valve core guide component comprises a guide sleeve;

providing the valve body component and the valve seat component, the valve body component comprising a valve body, the valve seat component comprising a valve seat body;

and welding and fixing the valve body and the valve seat body.