CN110094524B

CN110094524B - Electric valve

Info

Publication number: CN110094524B
Application number: CN201810285400.XA
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2018-01-31
Filing date: 2018-04-02
Publication date: 2022-12-20
Anticipated expiration: 2038-04-02
Also published as: CN110094524A

Abstract

The invention discloses an electric valve which comprises a valve body part, wherein the valve body part comprises a valve cavity and a valve seat part, the valve seat part comprises a valve port, a transmission part is arranged in the valve cavity, the transmission part comprises a nut, the nut is made of plastic materials, a valve core guide part is arranged in the valve cavity and is fixedly connected with the valve body part, the valve core part comprises an upper stop part and a valve core body fixedly connected with the upper stop part, the upper stop part and the valve core body are made of plastic materials, the valve core body comprises a reducing part and a body part, a sealing assembly is arranged between the upper stop part and the body part, and the sealing assembly is abutted between the outer wall of the reducing part and the inner wall of the valve core guide part.

Description

Electric valve

Technical Field

The invention relates to the technical field of fluid control, in particular to an electric valve.

Background

In commercial air conditioning systems such as multi-split air conditioning systems, an outdoor unit is required to be communicated with a plurality of indoor units, so that an electric valve is required to be installed on a refrigerant loop of each indoor unit and used for cutting off refrigerants or adjusting the flow rate. Reducing the material costs and weight of the valve is a development direction in which technicians are constantly striving.

Disclosure of Invention

The electric valve provided by the invention saves material cost and can reduce the whole weight of the valve.

The invention provides an electric valve, comprising:

a valve body component comprising a valve body including 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 the valve cavity of the electric valve, the transmission component comprises a screw rod and a nut, the screw rod is in threaded connection with the nut, the nut is made of a plastic material, and the nut comprises a radial protrusion part;

the valve core guiding component is arranged in the valve cavity and comprises a guiding sleeve which is fixedly connected with the valve body component;

the valve core component is arranged in the valve cavity, and the radial protruding part can be matched with the valve core component so that the nut can drive the valve core component to move along the axial direction of the guide sleeve;

the valve core component comprises an upper stop piece and a valve core body, the upper stop piece is sleeved on the outer periphery of the nut and fixedly connected with the valve core body, the upper stop piece and the valve core body are made of plastic materials, the valve core body comprises a reducing part and a body part, the cross section of the reducing part is approximately in a circular ring shape, the cross section of the body is approximately in a circular ring shape, the outer diameter of the body part is larger than that of the reducing part, a sealing assembly is arranged between the upper stop piece and the body part, and the sealing assembly is abutted between the outer wall of the reducing part and the inner wall of the guide sleeve.

The electric valve provided by the invention comprises a nut made of a plastic material and a valve core part, wherein the valve core part comprises an upper stop part and a valve core body fixedly connected with the upper stop part, the upper stop part and the valve core body are made of the plastic material, the valve core body comprises a reducing part and a body part, a sealing assembly is arranged between the upper stop part and the body part, and the sealing assembly is abutted between the outer wall of the reducing part and the inner wall of the guide sleeve, so that the material cost is saved, and the overall weight of the valve can be reduced.

Drawings

FIG. 1: the invention provides a structural schematic diagram of an electric valve in a first embodiment in a fully closed state;

FIG. 2 is a schematic diagram: a schematic view of the structure of the body components in the electric valve shown in figure 1;

FIG. 3: the structure of the transmission part of the electric valve shown in figure 1 is schematic;

FIG. 4: a perspective view of a nut set of the electric valve shown in figure 1; (ii) a

FIG. 5: the nut of the electric valve shown in fig. 1 is schematically matched with a valve core component, a sealing assembly and the like;

FIG. 5A: i in FIG. 5 ₁ A partial enlargement of (a);

FIG. 5B: i in FIG. 5 ₂ A partial enlarged view of the modified example;

FIG. 5C: i in FIG. 5B ₃ A partial enlarged view;

FIG. 6: the invention provides a structural schematic diagram of an electric valve in a second embodiment in a fully closed state;

FIG. 7 is a schematic view of: fig. 6 is a schematic structural view of the electric valve before the nut and the spool member are welded.

Detailed Description

In order that those skilled in the art will better understand the disclosure, reference will now be made in detail to the embodiments of the disclosure as illustrated in the accompanying drawings.

It should be noted that the upper and lower terms are defined as the components are located at the positions shown in the drawings of the specification, and are only used for clarity and convenience of 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" referred to herein means a direction from top to bottom or from bottom to top along the paper, that is, an axial direction of the rotor; 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. "thin wall" as used herein 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 is a schematic structural view of a fully closed electric valve according to a first embodiment of the present invention, fig. 2 is a schematic structural view of a valve body member in the electric valve shown in fig. 1, fig. 3 is a schematic structural view of a transmission member of the electric valve shown in fig. 1, fig. 4 is a perspective view of a nut kit of the electric valve shown in fig. 1, fig. 5 is a schematic structural view of a nut of the electric valve shown in fig. 1, a fitting relationship between the nut and a valve core member, a seal assembly, and the like, and fig. 5A is a schematic structural view of an I-shaped portion in fig. 5 ₁ A partial enlargement of (d).

As shown in fig. 1, the electrically operated valve of this embodiment includes a valve body member 10, a valve seat member 20, a transmission member 30, a valve body member 40, a nut set 50, a valve body guide member 60, and a coil member 70. Specifically, the method comprises the following steps:

as shown in fig. 1 and 2, the valve body member 40 includes a valve body 41 and a valve cover 42, which are fixedly welded to each other. The valve coil component 70 is disposed around the valve housing 42 and is fixedly connected to the valve body component 40 via the bracket 44.

The valve body 41 has a substantially cylindrical structure, is convenient to manufacture by pressing, stamping, rolling or extrusion shaping and other methods in the specific processing process, and has simple processing technology and high production efficiency. The valve body 41 is substantially three-stage, and specifically includes an upper cylinder portion 41a, an intermediate cylinder portion 41b, and a lower cylinder portion 41c. The outer wall diameter of the upper tube portion 41a is the smallest, and the outer wall diameter of the middle tube portion 41b is larger than the outer wall diameter of the upper tube portion 41 a. The outer wall diameter of the lower cylinder portion 41c is relatively largest, and the side wall of the lower cylinder portion 41c is provided with the first fluid port 401, so that the arrangement is more convenient for installing functional parts inside and welding installation parts outside, and the structure is more compact. The radial adapter 43 is welded and fixed to the side wall of the lower cylindrical portion 41c of the valve body 41. The valve cover 42 is welded and fixed to the outer wall of the middle cylindrical portion 41b of the valve body 41. The upper cylindrical portion 41a of the valve body 41 projects into the valve housing body. It will be appreciated that the valve cover 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. It should be understood that, on the premise of meeting the assembly requirement, the valve body 41 may also adopt a structure in which the diameters of the outer walls of the middle cylinder portion 41b and the lower cylinder portion 41c are the same, that is, the valve body 41 has a substantially two-segment structure.

As shown in fig. 1 and 3, a transmission member 30 is disposed in the valve cavity, the transmission member 30 includes a magnet rotor 34, a lead screw 31 and a nut 32, the nut 32 is made of a plastic material, the nut 32 can be integrally molded by injection molding of the plastic material for simplifying the manufacturing process, and the nut 32 includes a radial protrusion 321. The circumferential position of the screw 31 relative to the valve housing 42 is relatively fixed. The magnetic rotor 34 is arranged on the valve cover body 42, the magnetic rotor 34 is fixedly connected with the screw rod 31 through the connecting sheet 35, and the lower end part of the screw rod 31 extends into the valve body and is in threaded fit with the nut 32. In the large-flow electric valve, the screw rod 31 and the nut 32 are connected by non-self-locking threads, so that the electric valve has the advantage of avoiding hidden dangers such as blocking and the like.

Because the screw rod 31 does not generate relative displacement in the axial direction relative to the valve body component 40, and the magnetic rotor 34 is fixedly connected with the screw rod 31, 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, and the driving force of the coil component 70 does not change along with the axial movement of the valve core component (see below) in the working process.

In order to ensure that the nut 32 can convert the rotation of the screw 31 into axial movement to drive the spool member 10 to move axially along the spool guide member 60, as shown in fig. 1 and 4, a nut set 50 engaged with the nut 32 is disposed between the valve body 41 and the nut 32 to limit the circumferential rotation of the nut 32, and the nut set 50 is welded to the valve body 41. 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. The nut set 50 includes a nut limiting portion 51 for limiting the rotation of the nut 32 and a spool limiting portion 52 for limiting the upward movement 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. In the specific design of this embodiment, the nut set 50 is made of a metal plate material such as a steel material by stamping and flanging, and includes a cylindrical portion 55 and a flat plate portion 56 formed by bending the lower end portion of the cylindrical portion 55 outward, and the inner wall of the cylindrical portion 55 at least includes an axial plane section 58. The nut 32 is restrained from circumferential rotation by the flat section 58 engaging the nut 32. In this embodiment, the cross section of the inner wall of the cylindrical portion 55 is a square structure, and four sides of the square are circular arc transitions, that is, in this embodiment, four plane sections 58 are provided to limit the circumferential rotation of the nut 32. In the present embodiment, the flat plate portion 56 of the nut kit 50 is welded to the inner wall of the middle cylinder portion of the valve body 41, thereby simplifying the overall structure. The nut member 50 may be formed by processing the cylindrical portion 55 and the flat plate portion 56 separately and then fixing them by welding. The flat plate portion 56 serves as a spool restriction portion to restrict the maximum stroke of the upward movement of the spool member 10 in the axial direction. That is, with a simple structure of the nut kit 50, the dual functions of preventing the nut 32 from rotating circumferentially and axially restraining the spool member 10 are achieved.

As shown in fig. 1, the valve seat member 20 is welded and fixed to the lower opening portion of the valve body 41 to form a valve chamber 416, and includes a valve seat body 21, the valve seat body 21 is formed by processing a metal material, and the valve seat body 21 opens the valve port 200. The valve seat body 21 has a substantially annular structure, and the outer wall of the valve seat body 21 is provided with an outer stepped portion 213 having a stepped surface facing the lower tubular portion 41c of the valve body 41, and the lower tubular portion 41c of the valve body 41 is fixed by welding while abutting against the stepped surface of the outer stepped portion 213. The inner wall of the valve seat body 21 is further provided with a lower groove portion 212 with a downward inner bottom surface, the end portion of the axial connecting pipe 23 abuts against the lower groove portion 212, and the axial connecting pipe 23 and the valve seat body 21 are fixed by welding. The upper end surface portion of the valve seat body 21 forms a seal portion 222.

In the scheme, 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 valve chamber 416 is provided with the valve core member 10, and as shown in fig. 1, in order to ensure that the valve core member 10 does not axially shift during the axial movement process, a valve core guide member 60 for guiding the valve core member 10 is provided at an outer peripheral portion of the valve core member 10 in the valve chamber 416, and the valve core guide member 60 includes a guide sleeve 61 welded and fixed to an inner wall of the middle cylindrical portion 41b of the valve body 41. When the valve body component 10 is specifically arranged, the inner wall of the guide sleeve 61 serves as a guide surface to specifically guide the valve body component 10.

As shown in fig. 1 and 5, the radial protrusion 321 of the nut 32 can cooperate with the valve core component 10, so that the nut 32 can drive the valve core component 10 to move along the axial direction of the guide sleeve 61 to open or close the valve port 200.

The spool part 10 includes a spool body 11, an upper stopper 12, and a lower stopper 14, the spool body 11, the upper stopper 12, and the lower stopper 14 are made of a plastic material, and the upper stopper 12 and the lower stopper 14 may be embodied as plastic plates. The upper stop piece 12 is sleeved on the outer peripheral part of the nut 32, the upper stop piece 12 is fixedly connected with the valve core body 11, the valve core body 11 comprises a reducing part 111 and a body part 112, the cross section of the reducing part 111 and the cross section of the body part 112 are approximately circular, the outer diameter of the body part 112 is larger than that of the reducing part 111, the outer wall of the body part 112 is in clearance fit with the guide sleeve 61, a sealing assembly is arranged between the inner wall of the guide sleeve 61 and the outer wall of the reducing part 111, and the sealing assembly comprises a sealing ring 62 made of wear-resistant materials and a sliding sheet 63 made of rubber materials. The sealing member is axially retained between the lower end surface portion of the upper stopper 12 and the body portion 112. The circumferential direction of the seal member elastically abuts between the outer wall of the reduced diameter section 111 of the cartridge body 11 and the inner wall of the guide sleeve 61. The sealing assembly ensures that fluid between the axial connecting pipe and the vertical connecting pipe cannot be communicated through a gap between the guide sleeve 61 and the valve core body 11 when the valve is in a closed state. When the valve body 11 abuts against the seal portion 222 of the seat member 20, the first fluid port 401 and the second fluid port 201 do not communicate with each other.

The electric valve of the scheme is characterized in that the nut is made of a plastic material, the valve core part comprises an upper stop part and a valve core body fixedly connected with the upper stop part, the upper stop part and the valve core body are also made of the plastic material, the valve core body comprises a reducing part and a body part, a sealing assembly is arranged between the upper stop part and the body part, the sealing assembly is elastically abutted between the outer wall of the reducing part and the inner wall of the valve core guide part, the processing technology is simple, the material cost is saved, and the overall weight of the valve can be reduced.

The lower end surface part of the upper stopper 12 is fixedly connected with the upper end surface part of the reducing part 111 by ultrasonic welding or hot-press fusion. A lower stop 14 is provided in the inner cavity 101 of the cartridge body 11, the lower stop 14 also being made of a plastic material. For processing convenience, case body 11 can be by plastic material injection moulding integrated into one piece, and the inner wall of case body 11 includes the first location step 1111 that the step face is down, and the last terminal surface portion and the first location step 1111 butt of lower stop part 14 to pass through ultrasonic welding with the inner wall of case body 11 and fix or fuse mode fixed connection through the hot pressing. The lower stopper 14 divides the inner cavity 101 into an upper cavity 2 and a lower cavity 3, the lower stopper 14 includes a first axial through hole 141 communicating with the upper cavity 2 and the lower cavity 3, a radial protruding portion 321 of the nut 32 is disposed on the upper cavity 2, a transition portion 113 is included between the reduced diameter portion 111 and the body portion 112, and an upper end face portion of the radial protruding portion 321 can abut against a lower end face portion of the transition portion 113, so that the nut 32 can drive the valve core member 10 to move axially.

According to the aforesaid structural design, the valve core component 10 further includes a balance flow path, which includes the lower cavity 3 of the valve core body 11, the first axial through hole 141 of the lower stopper 14, and the axial through holes of the upper cavity 2 and the upper stopper 12. The arrangement of the balance flow path is beneficial to the balance of the upper and lower pressures of the valve core component 10 and the reduction of the pressure difference applied to the valve core component 10.

In the actual operation of the electric valve, due to vibration and other reasons, the transmission threads of the screw rod 31 and the nut 32 may slide, so that the locking force transmitted by the screw rod 31 to the nut 32 and the valve core component 10 fails, and the valve cannot be closed effectively, thereby causing a leakage problem. To avoid this problem, as shown in fig. 1 and 5, the nut 32 includes a lower extension 322 located below the radial protrusion 321, the lower extension 322 may be formed to extend downward from a lower end portion of the radial protrusion 321, with a predetermined gap between the lower extension 322 and the lower stopper 14, the lower extension 322 is substantially cylindrical, the lower extension 322 includes a receiving cavity 323, and an elastic member 33, which is a compression spring in this embodiment, is at least partially disposed in the receiving cavity 323 for securing the valve.

In order to filter the fluid flowing through the valve, a filter element 13 for filtering the fluid is disposed above the first axial through hole 141, and the filter element 13 includes a support ring 131 and a filter element 132 fixedly connected to the support ring 131. The periphery of the filter member 132 is sleeved with a compression spring, one end of the compression spring is sleeved with the periphery of the filter member 132 and directly abutted against the support ring 131, and then indirectly abutted against the lower stop member 14, and the other end of the compression spring is abutted against the nut 32.

In order to allow fluid to flow between the valve element member 10 and the valve seat member 20 relatively quickly and reduce the differential pressure force applied to the valve element member 10, the valve element body 11 includes an annular thin-walled portion 1122, the annular thin-walled portion 1122 can be brought into contact with or separated from the seal portion 222, the first fluid port 401 and the second fluid port 201 are not communicated when the annular thin-walled portion 1122 is brought into contact with the seal portion 222, and the first fluid port 401 and the second fluid port 201 are communicated through the valve port 200 when the annular thin-walled portion 1122 is separated from the seal portion 222.

Further, in order to improve the sealing performance when the valve is closed, as shown in fig. 5A, the lower end 100 of the annular thin-walled portion 1122 may be designed to have an arc structure, and the bottom end 102 of the arc structure may directly abut against or separate from the sealing portion 222 to close or open the valve port 200. The contact area between the valve body member 10 and the seal portion 222 is reduced, and the sealing performance is improved.

Furthermore, the valve opening and closing actions are smoother, and the valve opening and closing actions are easy to realize. As a specific design, the body portion 112 of the valve plug body 11 has a cylindrical structure with a thin upper part and a thick lower part, and includes a small diameter section 1121 and an annular thin-walled portion 1122 disposed below the small diameter section 1121, an outer wall of the small diameter section 1121 is in clearance fit with an inner wall of the guide sleeve 61, and an outer diameter and an inner diameter of the annular thin-walled portion 1122 are both larger than the small diameter section 1121. The lower end 100 of the annular thin-walled portion 1122 is designed to have an arc structure as shown in fig. 5A, and a horizontal projection of the outer wall of the small-diameter section 1121 substantially coincides with a circular line where the bottom end 102 of the arc structure is located. If the outer wall corresponding to small diameter portion 1121 is extended downward, it can substantially overlap with the circular line where bottom end 102 of the circular arc is located, and the lower end 100 of the annular thin wall portion is not subjected to or is subjected to a small pressure difference of the fluid.

Alternatively, as shown in FIGS. 5B and 5C, FIG. 5B is I of FIG. 5 ₂ A partial enlarged view of the modified example, and FIG. 5C is I in FIG. 5B ₃ Is shown in a partially enlarged view. The lower end 100 of the annular thin-walled portion 1122 may also be a circular truncated cone structure with a gradually decreasing diameter (i.e., a large upper portion and a small lower portion) in the direction toward the valve port 200 shown in fig. 5B, and the lower end thereof forms an annular sealing plane 102', a projection of the outer wall of the small-diameter section 1121 on the annular sealing plane 102' is defined as a sealing ring X, a diameter thereof is defined as D3, a diameter of an outer ring line y defining the annular sealing plane 102' is defined as D4, and a diameter of an 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= (D4-D5)/2, or D3 ≈ D4-D5)/2. That is, the horizontal projection of the outer wall corresponding to small diameter portion 1121 substantially coincides with the central circular line of small annular sealing plane 102'.

The following describes the specific operation process of the electric valve in this embodiment: :

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 magnetic rotor 34 is driven by the coil assembly to rotate clockwise and also to rotate counterclockwise, thereby moving the nut 32 up and down in 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, the valve core member 10 is restricted by the valve core restriction portion 52 and cannot move axially upward, the coil member 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 screw 31, so that the nut 32 drives the valve core member 10 to move downward, the lower end 100 of the annular thin-walled portion 1122 closes the valve port 200, and the lower end of the lower extension portion 322 abuts against the lower stopper 14. That is, the motor-operated valve is in a closed state. When the valve needs to be opened, the coil component 70 is energized to rotate the magnetic rotor 34 counterclockwise, and the nut 32 drives the valve core component 10 to move axially upward until the radial protrusion 321 of the nut 32 abuts against the valve core stop portion 52 of the nut sleeve 50, so as to achieve a fully opened state of the valve.

The electric valve of the embodiment comprises a nut made of plastic materials, the valve core part comprises an upper stop part and a valve core body fixedly connected with the upper stop part, the upper stop part and the valve core body are made of plastic materials, the valve core body comprises a reducing part and a body part, the outer diameter of the body part is larger than that of the reducing part, the sealing assembly is arranged between the upper stop part and the body part and elastically abuts between the outer wall of the reducing part and the inner wall of the valve core guide part, the processing technology is simple, the material cost is saved, the overall weight of the valve can be reduced, and the sealing assembly is convenient to assemble.

Fig. 6 is a schematic structural view of an electrically operated valve according to a second embodiment of the present invention in a fully closed state, and fig. 7 is a schematic structural view of the electrically operated valve shown in fig. 6 before a nut and a valve body member are welded to each other.

The structures of the valve seat component, the magnetic rotor and the screw rod structure in the transmission component, the valve body component, the nut kit, the valve core guiding component, the coil component, the spring and the filter assembly of the electric valve of the embodiment are the same as those of the first embodiment, and the structures and the reference numbers of the relevant components in the first embodiment are cited in the first embodiment.

As shown in fig. 6 and referring to fig. 2 to 4 and 5A to 5C, the valve body member 40 includes a valve body 41 and a valve cover 42, which are fixedly welded to each other. The coil member 70 is fitted around the outer periphery of the valve housing 42 and is fixedly connected to the valve body member 40 via the bracket 44.

The valve body 41 has a substantially cylindrical structure, is convenient to manufacture by pressing, stamping, rolling or extrusion shaping and other methods in the specific processing process, and has simple processing technology and high production efficiency. The valve body 41 is substantially three-stage, and specifically includes an upper cylinder portion 41a, an intermediate cylinder portion 41b, and a lower cylinder portion 41c. The outer wall diameter of the upper cylinder portion 41a is the smallest, the outer wall diameter of the middle cylinder portion 41b is larger than the outer wall diameter of the upper cylinder portion 41a, the outer wall diameter of the lower cylinder portion 41c is relatively the largest, and the side wall of the lower cylinder portion 41c is provided with a first fluid port 401. The arrangement is more convenient for installing functional parts inside and welding and installing parts outside, so that the structure is more compact. 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 cylindrical portion 41a of the valve body 41 extends into the valve cover body 1. 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. It should be understood that, on the premise of meeting the assembly requirement, the valve body 41 may also adopt a structure in which the diameters of the outer walls of the middle cylinder portion 41b and the lower cylinder portion 41c are the same, that is, the valve body 41 has a substantially two-segment structure.

As shown in fig. 6 and 3, the transmission member 30A is disposed in the valve cavity 416, the transmission member 30A includes the magnetic rotor 34, the lead screw 31, and the nut 32A, the nut 32A is made of a plastic material, and the nut 32A includes the radial protrusion 321A. The screw 31 is not displaced in the axial direction relative to the valve housing 42. The magnetic rotor 34 is arranged in the valve housing, the magnetic rotor 34 is fixedly connected with the screw rod 31 through a connecting sheet 35, and the lower end part of the screw rod 31 extends into the valve body and is in threaded fit with the nut 32A. In the large-flow electric valve, the screw rod 31 and the nut 32A are connected by non-self-locking threads, so that the electric valve has the advantage of avoiding hidden dangers such as blocking and the like.

Because the screw rod 31 and the valve body component 40 do not generate relative displacement in the axial direction, and the magnetic rotor 34 is fixedly connected with the screw rod 31, 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, and the driving force of the coil component 70 does not change along with the axial movement of the valve core component (see below) in the working process.

In order to ensure that the nut 32A can convert the rotation of the screw 31 into axial movement to drive the valve core component 10A to move axially, as shown in fig. 1 and 4, a nut set 50 matched with the nut 32A is arranged between the valve body 41 and the nut 32A to limit the circumferential rotation of the nut 32, and the nut set 50 is welded and fixed with the valve body 41. 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. The nut set 50 includes a nut limiting portion 51 for limiting the rotation of the nut 32A and a spool limiting portion 52 for limiting the upward movement stroke of the spool member 10, and the nut 32A drives the spool member 10A to move axially upward until the spool member 10A abuts against the spool limiting portion 52, so that the spool member cannot move upward any more. In the specific design of the present embodiment, the nut set 50 is made of a metal plate material such as a steel material by stamping and flanging, and includes a cylindrical portion 55 and a flat plate portion 56 formed by bending the lower end portion of the cylindrical portion 55 outward, and the inner wall of the cylindrical portion 55 at least includes an axial plane section 58. The nut 32A is restrained from circumferential rotation by the flat section 58 engaging the nut 32A. In this embodiment, the cross-section of the inner wall of the cylindrical portion 55 is substantially square, with the four sides of the square having circular arc transitions, i.e., in this embodiment, four flat sections 58 are provided to limit the circumferential rotation of the nut 32A. In the present embodiment, the flat plate portion 56 of the nut kit 50 is welded to the inner wall of the middle cylinder portion of the valve body 41, thereby simplifying the overall structure. The nut member 50 may be formed by processing the cylindrical portion 55 and the flat plate portion 56 separately and then fixing them by welding. The flat plate portion 56 serves as a spool restriction portion to restrict the maximum stroke of upward movement of the spool member 10A in the axial direction. That is, with a nut kit 50 of simple structure, the dual functions of preventing the nut 32A from rotating circumferentially and axially restraining the spool member 10A are achieved.

As shown in fig. 6, the valve seat member 20 is welded and fixed to the lower opening portion of the valve body 41 to form a valve chamber 416, and includes a valve seat body 21 formed by processing a metal material, the valve port 200 is opened in the valve seat body 21, and a seal portion 222 is formed in an upper end surface portion of the valve seat body 21. The valve seat body 21 has a substantially annular structure, and the outer wall of the valve seat body 21 is provided with an outer stepped portion 213 having a stepped surface facing the lower tubular portion 41c of the valve body 41, and the lower tubular portion 41c of the valve body 41 is fixed by welding while abutting against the stepped surface of the outer stepped portion 213. The inner wall of the valve seat body 21 is also provided with a lower groove portion 212 having a step facing downward. The end of the axial nipple 23 abuts the lower recess portion 212. The axial connecting pipe 23 is fixed to the valve seat body 21 by welding.

The valve chamber 416 has a spool member 10A disposed therein. As shown in fig. 6, in order to ensure that the valve core member 10A does not axially shift during the axial movement with the nut 32A, a valve core guide member 60 for guiding the valve core member 10A is provided at an outer peripheral portion of the valve core member 10A in the valve chamber 416, and is welded and fixed to an inner wall of the middle cylindrical portion 41a of the valve body 41. The spool guide member 60 includes a guide sleeve 61. Specifically, the inner wall of the guide sleeve 61A is arranged to guide the spool member 10A as a guide surface.

Specifically, as shown in fig. 6 and 7, the spool member 10A includes a spool body 11A made of a plastic material and an upper stopper 12A made of a plastic material, and the upper stopper 12A is fixedly connected to the spool body 11A by ultrasonic welding or by thermocompression fusion. The valve core body 11A is formed by injection molding of a plastic material, and is further formed by integral injection molding of plastic. The spool body 11A includes a reduced diameter portion 111A and a body portion 112A. The cross section of the reduced diameter portion 111A and the cross section of the body portion 112A are substantially circular rings, and the outer diameter of the body portion 112A is larger than the outer diameter of the reduced diameter portion 111A. A seal assembly is arranged between the inner wall of the guide sleeve 61A and the outer wall of the reducing portion 111A, and the seal assembly comprises a seal ring 62A made of wear-resistant material and a slip sheet 63A made of rubber material. The seal member elastically abuts between the outer wall of the reduced diameter section 111A of the spool body 11A and the inner wall of the guide sleeve 61A. The sealing assembly is axially retained between the lower end surface of the upper stopper 12A and the body portion 112A. The sealing assembly ensures that fluid between the axial connection pipe and the vertical connection pipe cannot be communicated through a gap between the guide sleeve 61 and the valve core body 11A when the valve is in a closed state.

The upper stopper 12A is sleeved on the periphery of the nut 32A, and the lower end surface portion of the upper stopper 12A is fixedly connected with the upper end surface portion of the reduced diameter portion 111A by ultrasonic welding or by hot press fusion. For the sake of processing convenience, the cartridge body 11A and the upper stopper 12A may be injection-molded integrally from a plastic material. The inner cavity 101A of the valve core body 11A includes an upper cavity 2A and a lower cavity 3A, and the wall thickness of the upper cavity 2A is greater than that of the lower cavity 3A.

Upper chamber 2A includes a fitting chamber 21A and a housing chamber 22A. Specifically, the inner wall of the upper chamber 2A includes a stopping step 1111A with an upward facing step, the stopping step 1111A cooperates with the upper stopper 12A to form a matching chamber 21A, the radial protrusion 321A is disposed in the matching chamber 21A, and an upper end surface portion of the radial protrusion 321A can abut against a lower end surface portion of the upper stopper 12A, so that the nut 32 can drive the valve element component 10A to move along the axial direction of the guide sleeve 61. When the valve body 11A abuts against the seal portion 222 of the valve seat member 20, the lower end surface portion of the radial projecting portion 321A can abut against the step surface of the stopper step 1111A.

The accommodating cavity 22A is arranged below the matching cavity 21A, and the inner diameter of the accommodating cavity 22A is smaller than that of the matching cavity 21A. Between receiving chamber 22A and lower chamber 3A, annular projection 115A is included, and nut 32A includes a lower extension 322A that extends into receiving chamber 22A. The elastic member 33 is disposed in the accommodating chamber 22A. One end of the elastic member 33 abuts on the lower end of the lower extension 322A, and the other end abuts on the annular projection 115A. In the present embodiment, the elastic element 33 is embodied as a compression spring. The elastic element 33 is provided to prevent the screw 31 from slipping with the driving screw of the nut 32A due to vibration and the like during actual operation of the electric valve, so that the locking force transmitted by the screw 31 to the nut 32A and the valve body member 10 is lost, and the valve cannot be closed effectively, thereby causing a leakage problem. To avoid this problem, the elastic element 33 ensures that the valve remains closed in this case.

The annular projection 115A includes a first axial through hole 116A communicating with the accommodation chamber 22A and the lower chamber 3A. The filter member 13 of the spool member 10A is disposed in the first axial through hole 116A. The filter element 13 comprises a support ring 131 and a filter element 132 which is fixedly connected to the support ring 131. The elastic element 33 is sleeved on the periphery of the filter element 132, one end of the support ring 131 is directly abutted against the elastic element 33, and the other end of the support ring 131 is abutted against the upper end face of the annular protrusion 115A. The filter element 132 is at least partially disposed within the first axial through-hole. In this case, one end of the spring 33A directly abuts against the annular projection 115A, and the problem of leakage due to the ineffective closing can be avoided.

According to the above structure, the valve core component 10A further includes a balance flow path, which includes the lower cavity 3A, the first axial through hole 116A and the upper cavity 2A of the valve core body 11A. The arrangement of the balance flow path is beneficial to the balance of the upper and lower pressures of the valve core component 10A and the reduction of the pressure difference applied to the valve core component 10A.

In order to allow fluid to flow between the valve element member 10A and the valve seat member 20 relatively quickly and reduce the differential pressure force applied to the valve element member 10A, the valve element body 11A includes an annular thin-walled portion 1122A, the annular thin-walled portion 1122A can be brought into contact with or separated from the seal portion 222, the first fluid port 401 and the second fluid port 201 are not communicated when the annular thin-walled portion 1122A is brought into contact with the seal portion 222, and the first fluid port 401 and the second fluid port 201 are communicated through the valve port 200 when the annular thin-walled portion 1122A is separated from the seal portion 222.

Further, in order to improve the sealing performance when the valve is closed, as shown in fig. 5A, the lower end portion 100 of the annular thin-walled portion 1122A may be designed to have an arc structure as shown in the drawing, and the bottom end 102 of the arc structure may directly abut against or be separated from the sealing portion 222 to close or open the valve port 200. The contact area between the valve body member 10 and the seal portion 222 is reduced, and the sealing performance is improved.

Furthermore, the valve opening and closing actions are smoother, and the valve opening and closing actions are easy to realize. As a specific design, the body 112A of the valve plug body 11A has a cylindrical structure with a thin top and a thick bottom, and includes a small diameter section 1121A and an annular thin-walled portion 1122A disposed below the small diameter section 1121A, an outer wall of the small diameter section 1121A is in clearance fit with an inner wall of the guide sleeve 61, and both an outer diameter and an inner diameter of the annular thin-walled portion 1122A are larger than those of the small diameter section 1121A. The lower end 100 of the annular thin-walled portion 1122A is designed to have an arc structure as shown in fig. 5A, and a horizontal projection of the outer wall of the small-diameter section 1121A substantially coincides with a circular line on which the bottom end 102 of the arc structure is located. If the outer wall corresponding to small diameter portion 1121 is extended downward, it can substantially overlap with the circular line where bottom end 102 of the circular arc is located, and the lower end 100 of the annular thin wall portion is not subjected to or is subjected to a small pressure difference of the fluid.

Alternatively, referring to fig. 5B and 5C, the lower end 100 of the annular thin-wall portion 1122A may also be a circular truncated cone structure with a gradually decreasing diameter (i.e., a large upper portion and a small lower portion) toward the valve port 200 as shown in fig. 5B, and the lower end thereof forms an annular sealing plane 102', and a projection of the outer wall of the small-diameter section 1121 on the annular sealing plane 102' is a sealing ring X, and a diameter thereof is D3, a diameter of an outer ring line y defining the annular sealing plane 102' is D4, and a diameter of an inner ring line Z is D5, then D3 is equal to or approximately equal to one half of D4-D5, that is, D3= (D4-D5)/2, or D3 ≈ D4-D5)/2. That is, a horizontal projection of the outer wall corresponding to small-diameter portion 1121A substantially coincides with the center line of annular sealing plane 102'.

The operation of the electric valve of this embodiment is similar to that of the electric valve of the embodiment, and the description is not repeated here.

The electrically operated valve of the embodiment has the advantages that compared with the electrically operated valve of the first embodiment, the lower stop is not separately arranged, the number of parts is reduced, an ultrasonic welding process is reduced, and the process is simpler.

In addition, in the foregoing description of the invention, it is understood that the electrically operated valve of the present application can be used as an on/off valve, and can also be used as a flow rate control valve by controlling the flow rate of the valve port.

The electrically operated valve provided by the present invention has been described in detail above. 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, without departing from the principle of the present invention, it is possible to make various improvements and modifications to 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, the screw rod is in threaded connection with the nut, the nut is made of a plastic material, and the nut comprises a radial protrusion part;

the valve core part comprises an upper stopper and a valve core body, the upper stopper is sleeved on the outer periphery of the nut and fixedly connected with the valve core body, the upper stopper and the valve core body are made of plastic materials, the valve core body comprises a reducing part and a body part, the cross section of the reducing part is approximately circular, the cross section of the body part is approximately circular, the outer diameter of the body part is larger than that of the reducing part, a sealing component is arranged between the upper stopper and the body part and abutted between the outer wall of the reducing part and the inner wall of the guide sleeve, the body part comprises an annular thin wall part, and the annular thin wall part can be axially abutted against or separated from the valve seat body to seal or open the port of the second fluid;

the valve seat body is formed by processing a metal material, the upper end face part of the valve seat body comprises a sealing part, the body part comprises a small-diameter section and an annular thin-wall part arranged below the small-diameter section, the outer diameter and the inner diameter of the annular thin-wall part are respectively larger than those of the small-diameter section, and the outer wall of the small-diameter section can be in clearance fit with the inner wall of the guide sleeve;

the lower end part of the annular thin wall part is of an arc structure, the bottom end of the arc structure can be abutted against or separated from the sealing part, and the projection of the outer wall of the small-diameter section in the horizontal direction is approximately superposed with a circular line where the bottom end of the arc structure is located; or the lower end part of the annular thin-walled part is of a circular truncated cone structure with a large upper part and a small lower part, the lower end surface of the circular truncated cone structure forms an annular sealing plane, the annular sealing plane can be abutted against or separated from the sealing part, and the horizontal projection of the outer wall of the small-diameter section is approximately superposed with the central circular line of the annular sealing plane.

2. The electrically operated valve of claim 1, wherein the valve element further comprises a lower stop member disposed in the inner cavity of the valve element body, the lower stop member is fixedly connected to the inner wall of the valve element body, the lower stop member divides the inner cavity into an upper cavity and a lower cavity, the lower stop member comprises a first axial through hole communicating with the upper cavity and the lower cavity, a transition portion is disposed between the reduced diameter portion and the body portion, the radial protruding portion is disposed in the upper cavity, and the radial protruding portion can abut against the transition portion, so that the nut can drive the valve element to move axially.

3. The electric valve according to claim 2, wherein the lower stopper is made of a plastic material, the inner wall of the valve body includes a first positioning step portion with a downward step surface, the lower stopper abuts against the first positioning step portion, the lower stopper is fixed to the inner wall of the valve body by ultrasonic welding or fixed by hot press fusion, and the lower end surface portion of the upper stopper is fixed to the upper end surface portion of the reduced diameter portion by ultrasonic welding or fixed by hot press fusion.

4. The electrically operated valve of claim 2, wherein the nut and the poppet body are each injection molded from a plastic material, the nut including a lower extension below the radial projection, the lower extension being generally cylindrical, the lower extension including a receiving cavity in which a resilient element is at least partially disposed, one end of the resilient element abutting the lower stop and the other end abutting the nut.

5. The electric valve according to claim 4, wherein the lower stop member is made of a plastic material, a filter member is disposed above the first axial through hole, the filter member comprises a support ring and a filter member, the elastic element is sleeved on the outer periphery of the filter member, one end of the support ring abuts against the elastic element, and the other end of the support ring abuts against the upper end surface portion of the lower stop member.

6. The electric valve according to claim 1, wherein the lower end surface of the upper stopper is fixedly connected to the upper end of the reduced diameter portion by ultrasonic welding or by hot press fusion, the valve element body includes an upper chamber and a lower chamber, the inner wall of the upper chamber includes a stopping step with an upward step surface, the stopping step and the upper stopper form a matching chamber, the radial protrusion is disposed in the matching chamber, the upper end surface of the radial protrusion can abut against the lower end surface of the upper stopper, so that the nut can drive the valve element to move axially along the guide sleeve, and the lower end surface of the radial protrusion can abut against the step surface of the stopping step.

7. The electric valve of claim 6, wherein the upper chamber comprises a receiving chamber disposed below the mating chamber, an inner diameter of the receiving chamber is smaller than an inner diameter of the mating chamber, an annular protrusion is disposed between the receiving chamber and the lower chamber, the nut further comprises a lower extension extending into the receiving chamber, the receiving chamber is provided with an elastic element, one end of the elastic element abuts against the lower extension, and the other end abuts against the annular protrusion.

8. The electric valve according to claim 7, wherein the annular protrusion comprises a first axial through hole communicating with the accommodating cavity and the lower cavity, the valve element further comprises a filter component, the filter component comprises a support ring and a filter element fixedly connected with the support ring, the elastic element is sleeved on the periphery of the filter element, one end of the support ring abuts against the elastic element, the other end of the support ring abuts against the upper end surface of the annular protrusion, and the first axial through hole is provided with the filter element.