CN113775771A

CN113775771A - Electric valve

Info

Publication number: CN113775771A
Application number: CN202010523944.2A
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: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-12-10

Abstract

The invention discloses an electric valve, which comprises a valve body component, a valve seat component, a nut component, a rotor component and a valve core component, wherein the nut component is fixedly connected with the valve body component, the rotor component can drive the valve core component to move along the axial direction of the valve body component, the nut component comprises a nut, the rotor component comprises a rotor and a screw rod, the nut is in threaded connection with the screw rod, the valve core component comprises a valve sleeve and a valve core, the valve sleeve is approximately cylindrical, the valve core is approximately cylindrical and axially communicated, the valve sleeve is movably connected with the screw rod, the screw rod can drive the valve sleeve to move axially, the valve sleeve is fixedly connected with the valve core, the valve core can be abutted against or separated from a sealing part of the valve seat component, the nut comprises a guide hole section, and at least part of the valve sleeve is positioned in the guide hole section, the valve sleeve is in clearance sliding fit with the guide hole section, and the valve core component of the electric valve is simple in structure.

Description

Electric valve

Technical Field

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

Background

In the field of fluid control technology, such as refrigeration technology, electrically operated valves can be used to shut off or regulate the refrigerant or to regulate the compressor suction pressure. FIG. 8 is a schematic diagram illustrating a structure of a prior art electric valve; figure 9 shows an exploded view of the valve core component of figure 8. As shown in fig. 8 and 9, the electric valve includes a motor member 01, a coupling member 02, a valve body member 03, and a valve body member 04. The valve core component 03 comprises a screw sleeve 031, a valve core body 032, a valve head assembly 033 and a pre-tightening spring 034, wherein the valve core assembly comprises a valve head connecting rod 0331, a valve head 0332, a sealing gasket 0333 and a threaded retaining ring 0334. Screw sleeve 031 is connected with screw rod 11, and screw sleeve 031 links firmly with case body 032 screw thread, and valve head connecting rod 0331 adorns in case body 032, and screw retaining ring 0334 links firmly with valve head connecting rod 0331 screw thread, and sealed fill-up 0333 suit is in valve head connecting rod 0331, and sealed fill-up 0333 receives screw retaining ring 0334 axial spacing, valve head 0332 and valve head connecting rod 0331 threaded connection, and screw retaining ring 0334 compresses tightly sealed fill-up 0333. The electric valve core part has a complex structure.

Disclosure of Invention

The application aims to provide an electric valve, and a valve core part of the electric valve is simple in structure.

The electric valve comprises a valve body part, a valve seat part, a nut part, a rotor part and a valve core part, wherein the nut part is fixedly connected with the valve body part, the rotor component can drive the valve core component to move along the axial direction of the valve body component, the nut component comprises a nut, the rotor component comprises a rotor and a screw rod, the nut is in threaded connection with the screw rod, the valve core component comprises a valve sleeve and a valve core, the valve sleeve is approximately cylindrical, the valve core is approximately cylindrical and axially penetrates through the valve sleeve, the valve sleeve is movably connected with the screw rod, the screw rod can drive the valve sleeve to axially move, the valve sleeve is fixedly connected with the valve core, the valve body can be abutted against or separated from the sealing part of the valve seat component, the nut comprises a guide hole section, the valve sleeve is at least partially located in the pilot bore section, and the valve sleeve is in clearance sliding fit with the pilot bore section.

The valve core component of the electric valve comprises a valve sleeve and a valve core, wherein the valve sleeve is approximately cylindrical, the valve core is approximately cylindrical and axially communicated, and the valve sleeve is fixedly connected with the valve core.

Drawings

Fig. 1 is a schematic structural diagram of an electrically operated valve according to a first embodiment of the present invention;

FIG. 2 is a schematic view of a connection structure of some parts shown in FIG. 1;

fig. 3 is a cross-sectional view of the valve sleeve of fig. 1;

FIG. 4 is a schematic structural view of the valve core member of FIG. 1;

FIG. 5 is a schematic view of a connection structure of the valve core member and the screw rod;

FIG. 6 is a cross-sectional view of the valve cartridge of FIG. 1;

FIG. 7 is a schematic view of the bearing of FIG. 1;

FIG. 8 is a schematic diagram illustrating a structure of a prior art electric valve;

figure 9 shows an exploded view of the valve core component of figure 8.

Detailed Description

It should be noted that, if the terms of side position such as "upper" and "lower" are used herein, they are defined with reference to the position shown in the drawings of the present specification, and it should be understood that the terms of side position are used only for the clarity and convenience of describing the technical solutions and should not limit the scope of protection.

An active connection in this context means that one can directly or indirectly move the other and, in a certain state, can move relative to each other.

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions of the present application are further described below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural view of a first embodiment of an electrically operated valve according to the present invention, fig. 2 is a schematic structural view of a connection structure of a part of components in fig. 1, fig. 3 is a sectional view of a valve housing in fig. 1, fig. 4 is a schematic structural view of a valve core component in fig. 1, fig. 5 is a schematic structural view of a connection structure of a valve core component and a screw rod, etc., and fig. 6 is a sectional view of the valve core in fig. 1.

As shown in fig. 1, the electric valve includes a valve body member 10, a valve seat member 20, a rotor member 30, a nut member 40, and a valve core member 50. The valve body component 10 comprises an upper valve body 11, a lower valve body 12 and a connecting sleeve 13, wherein the lower valve body 12 comprises a first connecting port 121, and a first connecting pipe 14 is fixedly connected with the first connecting port 121. The upper valve body 11, the lower valve body 12 and the connecting sleeve 13 are all made of stainless steel materials. The connecting sleeve 13 is substantially cylindrical and includes a second insertion portion 132 located inside the lower valve body 12, a first insertion portion 131 located inside the upper valve body 11, and a connecting portion 133 located between the lower end of the upper valve body 11 and the upper end of the lower valve body 12. The first insertion portion 131 and the connection portion 133 form a first positioning portion, and the second insertion portion 132 and the connection portion 133 form a second positioning portion.

As a specific example, as shown in fig. 1 and 2, the outer diameter of the connecting portion 133 is larger than that of the second insertion portion 132, and the outer diameter of the connecting portion 133 is larger than that of the first insertion portion 131. In this way, the connecting portion 133 and the first insertion portion 131 together form a stepped first positioning portion 1301, and the connecting portion 133 and the second insertion portion 132 together form a stepped second positioning portion 1302. The lower end of the upper valve body 11 contacts the connection portion 133, the outer wall of the first insertion portion 131 is in interference fit with the inner wall of the upper valve body 11, the upper end of the lower valve body 12 contacts the connection portion 133, and the outer wall of the second insertion portion 132 is in interference fit with the inner wall of the lower valve body 12. At this time, a first welding position is formed at the matching position of the upper valve body 11 and the connecting portion 133, and the upper valve body 11 and the connecting portion 133 are welded and fixed at the first welding position through laser welding or argon arc welding. The lower valve body 12 and the connecting portion 133 form a second welding position, and the lower valve body 12 and the connecting portion 133 are welded and fixed at the second welding position through laser welding, argon arc welding or furnace welding.

The upper valve body 11 is a stainless steel tensile member, the lower valve body 12 is a stainless steel tensile member, the upper valve body 11 and the connecting sleeve 13 are positioned through the first positioning portion 1301, and the lower valve body 12 and the connecting sleeve 13 are positioned through the second positioning portion 1302.

As shown in fig. 1, the valve seat member 20 includes a valve seat body 21, a pressing ring 22, a seal ring 23, and an inner liner 24. The valve seat body 21 and the lower valve body 12 are welded and fixed, the press ring 22 and the valve seat body 21 are fixed by caulking, and the seal ring 23 is installed between the stepped hole of the valve seat body 21 and the inner liner 24. The sealing ring 23 is made of a non-metal soft material, such as a rubber material, or a PTFE material, the sealing ring 23 includes a sealing portion 231, the lower valve body 12 is welded and fixed to the valve seat body 21, and the second connecting pipe 25 is welded and fixed to the second connecting port portion 211 of the valve seat body 21.

The rotor component 30, the nut component 40 and the valve core component 30 are all arranged in the valve cavity. As shown in fig. 1, the rotor member 30 is axially movable with respect to the valve body member 10, and the rotor member 30 includes a rotor 31, a holder 32, and a screw 33. The fixing frame 32 is fixedly connected to the rotor 31 and the screw 33. The rotor 31 is loosely fitted to the upper valve body 11, and the lead screw 33 is drivingly connected to the nut 41 of the nut member 40, specifically, the male screw portion of the lead screw 33 is threadedly engaged with the female screw portion of the nut 41. The rotor member 30 is axially movable with respect to the nut 41, which will be described later, while rotating in the circumferential direction.

As shown in fig. 1 and 2, the nut assembly 40 further includes a connecting frame 42, the nut 41 is made of plastic, the connecting frame 42 is made of metal, the connecting frame 42 can be made of stainless steel, and the connecting frame 42 and the nut 41 are fixed by injection molding. The connecting frame 42 includes a first axial passage 421.

As shown in fig. 2, the inner wall of the connecting sleeve 13 includes a third positioning portion 1303, the connecting frame 42 of the nut component 40 is matched with the third positioning portion 1303 for pre-positioning, in this embodiment, the third positioning portion 1303 is in a step-like arrangement, a third welding position is formed between the outer wall of the connecting frame 42 and the inner wall of the connecting sleeve 13, and the connecting frame 42 and the connecting sleeve 13 are fixed by laser welding or argon welding, or the connecting frame 42 and the connecting sleeve 13 are riveted and fixed. Here, the third positioning portion 1303 is not provided, and positioning by a tool may be performed.

The rotor member 30 is movably connected to the valve core member 50, so that during the axial movement of the rotor member 30 relative to the nut 41, the rotor member 30 can drive the valve core member 50 to move axially. The rotor part 30 further comprises bearings 34, connections 35. As shown in fig. 7, the bearing 34 includes a bearing inner race 341, a bearing outer race 342, and balls 343. The lower end of the screw 33 is fixedly connected with the bearing inner 341, and the two can be fixedly connected by welding or riveting. The connecting piece 35 is arranged outside the screw rod 33, the screw rod 33 comprises a radial protrusion 331, the radial protrusion 331 limits the connecting piece 35 to be separated from the screw rod 33 from the upper end of the screw rod 33, namely, the connecting piece 35 is axially limited between the radial protrusion 331 and the bearing 34, and the connecting piece 35 is fixedly connected with the valve sleeve 52 and can be riveted and fixed. When the electric valve is in the valve-open state, the upper end of the bearing outer ring 342 abuts against the connector 35, and when the electric valve is in the valve-close state, there is a displacement between the upper end of the bearing outer ring 342 and the connector 35.

The upper end surface of the bearing outer race 342 of the bearing 34 can be in contact with the lower end surface of the connecting member 35. The bearing 34 is provided, when the rotor 31 is driven to rotate clockwise or counterclockwise, the screw rod 33 rotates along with the rotor 31 and moves axially, and when the screw rod 33 rotates and moves downwards, the bearing inner 341 is directly acted on, so that the bearing outer 342 only moves downwards under the axial force, and the valve core component 50 does not rotate along with the rotation of the screw rod 33. After the valve core member 50 contacts the sealing portion 231 of the sealing ring 23, the screw rod 33 continues to move downwards to press the sealing ring 23, the valve core member 50 basically does not rotate, abrasion between the lower end of the valve core member 50 and the sealing portion 231 is improved, and valve closing reliability is improved.

As shown in fig. 3 and 4 in combination with fig. 1, the valve core member 50 includes a valve core 51 and a valve sleeve 52 fixedly connected to the valve core 51. The valve element 51 is formed in a substantially cylindrical shape that penetrates in the axial direction, and the valve element 51 and the valve element sleeve 52 are fixed by laser welding or argon welding. The valve sleeve 52 is cylindrical and axially penetrates through the valve sleeve before being assembled with other components.

The valve housing 52 includes a support portion 520, the connector 35 of the rotor member 30 is seated on the support portion 520, and the upper end of the valve housing 52 is riveted to the connector 35. When the screw 33 moves axially upward, the screw 33 carries the valve core member 50 axially upward through the bearing 34 and the connecting member 35.

The core member 50 further includes a bearing seat 53 and an elastic member 54. The upper end of the bearing seat 53 is abutted with the bearing outer ring 531 of the bearing 34, the lower end of the elastic element 54 is directly or indirectly abutted with the valve core 51, when the rotor 31 drives the screw rod 33 to rotate and move axially, and when the screw rod 33 moves downwards in a rotating manner, the downward acting force transmitted by the screw rod 33 directly acts on the bearing inner ring 341, the bearing outer ring 342 only moves downwards in an axial direction, the bearing outer ring 342 basically does not rotate in a circumferential direction relative to the screw rod 33, and the downward axial force applied to the bearing outer ring 342 acts on the elastic element 54 and the valve core 51, so that the valve closing of the electric valve is realized. When the screw 33 rotates and moves upward in the axial direction, it directly acts on the inner race 341 of the bearing, drives the outer race 342 of the bearing to move upward in the axial direction, and acts on the connecting member 35, the valve sleeve 52, and the valve core 51, so that the valve core 51 moves upward in the axial direction, and opens the electric valve.

Compared with the background art, the electric valve has the advantages that the valve core part is simple in structure, the rotor part is combined with the approximately cylindrical valve core and the approximately cylindrical valve sleeve which are axially communicated, the requirement of large diameter (more than 3.0mm of the diameter) of the electric valve and the miniaturization of the electric valve are both considered, and the whole structure of the electric valve is simple.

As shown in fig. 5, in order to improve the reliability and stability of the electric valve, in this embodiment, the elastic element 54 may be a compression spring. The bearing seat 53 is substantially hollow and "convex". The bearing housing 53 includes a first support section 531 and a second support section 532. The first support section 531 is approximately annular, the second support section 532 is approximately annular, the inner diameters of the first support section 531 and the second support section 532 are approximately equal in diameter, processing is convenient, and the outer diameter of the first support section 531 is smaller than the outer diameter of the second support section 532. The inner bore of the first support section 531 and the inner bore of the second support section 532 form an axial bore 530. The outer diameter of the resilient member 54 is smaller than the outer diameter of the bearing 34, and the bearing seat 53 may be in an inverted "convex" configuration, i.e., the bearing seat 53 is turned upside down in fig. 5.

The lower end of the valve body 51 can come into contact with or separate from the seal portion 231 of the seal ring 23 to adjust the flow rate of the electric valve. As shown in fig. 6, the valve core 51 is axially disposed therethrough and includes a second axial passage 5111 axially disposed therethrough. The valve body 51 is substantially cylindrical with a middle wall thickness and both end walls being thin, and the valve body 51 includes a first thin portion 511, a base portion 510, and a second thin portion 512. The first thin portion 511 and the second thin portion 512 are located above and below the base portion 510, respectively. The inner diameter and the outer diameter of the base portion 510 are substantially equal, and the inner diameter of the base portion 510 is smaller than the inner diameters of the first thin portion 511 and the second thin portion 513. The upper end surface of the base 510 serves as a filter support 5101. The base 510 itself forms the filter support 5101 on which the filter 55 sits, and there is no need to provide other components to support the filter, thereby reducing the number of components as much as possible and saving assembly and product costs.

As shown in fig. 3 to 5, the valve housing 52 specifically includes a slide-fit portion 521, an annular side protrusion 522, and a downward extending portion 523. The downward extending portion 523 of the valve sleeve 52 extends into the first thin portion 511 of the valve body 51, the lower end surface of the side protrusion 522 is seated on the upper end surface of the first thin portion 511, and the side protrusion 522 axially positions the valve body 51. The outer wall of the downward extension portion 523 and the outer wall of the first thin-wall portion 511 can be in interference fit to perform pre-positioning before welding, so that subsequent welding and fixing are facilitated.

The valve body member 50 is axially movable relative to the nut 41 by the rotor member. As shown in fig. 1, 2 and 4, the nut 41 includes a guide hole section 411 providing a partial space for the axial movement of the valve core member 50, the valve sleeve 52 is at least partially located in the guide hole section 411, the guide hole section 411 includes a small hole section 4111 and a large hole section 4112 located on the lower side of the small hole section 4111, the inner hole of the small hole section 4111 is substantially a circular hole, the inner hole of the large hole section 4112 is substantially a circular hole, and the inner diameter of the small hole section 4111 is smaller than the inner diameter of the large hole section 4112. Since the cylindrical valve element 51 and the cylindrical valve sleeve 52 are fixedly connected to each other to form a long axial length, in order to ensure the coaxiality of the valve element member with respect to the valve body member in the axial direction, as shown in fig. 3, the sliding fitting portion 521 of the valve sleeve 52 includes a first sliding portion 5211 capable of being in clearance sliding fit with the small hole section 4111 and a second sliding portion 5212 capable of being in clearance sliding fit with the large hole section 4112. The outer diameter of the first sliding portion 5211 is smaller than the outer diameter of the second sliding portion 5212. The guide hole section 411 of the nut 41 provides a moving stroke space for the axial movement of the valve core component 50, and provides a guide for the axial movement of the valve core component 50, which is beneficial to improving the axial offset and tilting of the valve core component 50 relative to the electric valve and the valve closing reliability of the valve core 51. As shown in fig. 1, when the electric valve is closed, part of the outer wall of the second sliding portion 5211 still has a clearance fit with the inner wall of the large hole section 4112, and the nut 41 still guides the valve core member 50.

Further, as shown in fig. 3, the inner bore of the valve housing 52 specifically includes a first bore section 5213, a second bore section 5214. The inner hole of the first hole section 5213 is substantially a circular hole, the inner hole of the second hole section 5214 is substantially a circular hole, the aperture of the first hole section 5213 is smaller than the aperture of the second hole section 5214, and the first hole section 5213 is located on the upper side of the second hole section 5214. A connecting section 5215 is included between the first and

second bore sections

5213, 5214. The first support section 531 of the bearing seat 53 extends into the first hole section 5213 and is in clearance fit with the inner wall of the first small hole section 5211, the upper end of the first support section 531 is abutted against the bearing outer ring 342 of the bearing 43, and the inner diameter of the first support section 531 is larger than the outer diameter of the bearing inner ring 341 of the bearing 43, so that the first support section 531 is not in contact with the bearing inner ring 341 of the bearing 34, and interference is avoided. The inner wall of the first bore section 5213 provides a guiding function for the first support section 531 of the bearing housing 53.

The second support section 532 of the bearing seat 53 is located in the second hole section 5214, and an axial gap t is always formed between the upper end surface of the second support section 532 of the bearing seat 53 and the valve sleeve 52, so as to facilitate consistency of valve opening pulses of the electric valve. However, when the valve core component of the electric valve is in different working positions, the t value of the valve core component is changed and is not a constant value. The elastic member 54 is disposed in the second hole section 5214, and the lower end of the second support section 532 of the bearing housing 53 abuts against the upper end of the elastic member 54. The arrangement of the bearing seat 53 enables the elastic part 54 to be abutted against the lower end face of the bearing seat 53 instead of being directly abutted against the bearing outer ring 342, so that the elastic part 54 is prevented from deflecting, the transmission axial force is stable, the internal leakage performance when the valve is closed is ensured, the reliability of the electric valve is facilitated, and the service life of the electric valve is prolonged.

As shown in fig. 6, the valve core 51 further includes a guide section 514 having a larger inner diameter at the upper end and a smaller inner diameter at the lower end between the first thin-wall portion 511 and the filter element support portion 5101, and the guide section 514 is provided to facilitate installation of the filter element 55 of the valve core member 52. The filter member 55 is arranged to prevent impurities in the fluid from entering the matching position of the external thread part of the screw rod 33 and the internal thread part of the nut 21 when the fluid exists in the electric valve, and prevent the screw rod 33 and the nut 21 from being locked due to the impurities.

As shown in fig. 4, the filter member 55 includes a bowl-shaped filter member 551 and a fixing ring 552, the filter member 551 is fixedly connected to the fixing ring 552, and the fixing ring 552 is axially limited between the valve core 51 and the valve sleeve 52. The elastic member 54 is sleeved on the periphery of the filter member 551, the lower end of the elastic member 54 abuts against the fixing ring 552, the fixing ring 552 is seated on the filter member supporting portion 5101 and is limited between the filter member supporting portion 5101 and the lower end of the downward extending portion of the valve housing 52, and the filter member 55 is reliably mounted. The elastic member 54 indirectly abuts against the valve body 51 via the fixing ring 552, so that the elastic force of the elastic member 54 can act on the valve body 51. When the filter member 55 is not provided, the elastic member 54 may directly abut against the valve body 51. That is, one end of the elastic member 54 abuts on the bearing seat 53, and the other end of the elastic member 54 abuts on the upper end of the base 510.

When the rotor 31 rotates to drive the screw rod 33 to rotate and move axially downward, the bearing inner ring 341 of the bearing 34 rotates along with the screw rod 33 and moves axially downward, the bearing outer ring 342 of the bearing 34 only moves downward under the axial force, the downward axial force applied to the bearing seat 53, the elastic part 54, the filter part 55 and the valve core 51 is acted on by the bearing outer ring 342, the valve core 51 is abutted with the sealing ring 23 to close the valve, and the first connecting pipe 14 is not communicated with the second connecting pipe 25. When the screw rod 33 rotates and moves upward, an upward force directly acts on the bearing inner ring 341 to drive the bearing outer ring 342 to move upward and axially, and further drive the connecting member 35 and the valve sleeve 52 to cause the valve core 51 to move upward and axially, so that the first connecting pipe 14 is communicated with the second connecting pipe 25. The filter part 55 is directly located on the valve core 51 and is abutted against the elastic part 54, the installation mode is simple and convenient, other parts are not added, the product cost is favorably reduced, and the assembly process is also convenient.

As shown in fig. 1, the electric valve further includes a sealing member 60 disposed between the connecting sleeve 13 and the valve core 51, and the sealing member 60 is disposed such that the first connecting port 121 and the second connecting port 211 are not communicated with each other through the valve cavity of the electric valve when the electric valve is closed. As shown in fig. 1, the sealing member 60 is located between the inner wall of the connecting sleeve 13 and the outer wall of the valve core 51, and the connecting sleeve 13 is sleeved outside the sealing member 60. The sealing member 60 is fixedly connected with the connecting sleeve 13, and "fixed" here means that the sealing member 60 does not fall off the connecting sleeve 13 in the axial direction, and does not limit that all parts in the sealing member 60 are fixedly connected with the connecting sleeve 13. The valve core 51 is in sliding fit with the sealing component 60, and the sealing component 60 also plays an axial guiding role for the valve core 51.

As shown in fig. 1 and 5, the connecting sleeve 13 includes a first axial limiting portion 135 and a second axial limiting portion 136. Specifically, the connecting sleeve 13 includes a first step surface and a second step surface facing downward, and the first step surface and the second step surface are arranged at an interval in the axial direction of the connecting sleeve 13. The first stepped surface serves as a first axial stopper 135, and the second stepped surface serves as a second axial stopper 136. The sealing member 60 includes an upper stopper 61, a seal ring 62 made of a soft material, a slide 63, and a lower stopper 64. The seal ring 62 is provided on the outer periphery of the slide piece 63, and the seal ring 62 and the slide piece 63 are located between the upper stopper 61 and the lower stopper 64. The sealing ring 62 is abutted with the inner wall of the connecting sleeve 13, and the inner wall of the sliding sheet 63 is abutted with the outer wall of the valve core 51. The upper limiting piece 61 is matched with the first stepped surface, so that the connecting sleeve 13 can limit the sealing component 60, and the lower end of the connecting sleeve 13 and the lower limiting piece 64 are riveted and fixed to limit the sealing component 60 in the axial direction. In order to improve the abrasion of the upper limit piece 61, the sliding sheet 63 and the lower limit piece 64 on the valve core 51 in the axial movement process of the valve core 51, the inner surfaces of the upper limit piece 61, the sliding sheet 63 and the lower limit piece 64 are respectively or simultaneously provided with a wear-resistant layer, so that the service life of the valve core 51 is prolonged. Specifically, the inner surfaces of the upper limit piece 61, the sliding piece 63 and the lower limit piece 64 can be plated with Ni-P-PTFE or DW + PTEF by a chemical compound method. In the embodiment, the inner surface of the slip sheet 63 is plated with Ni-P-PTFE or DW + PTEF by a chemical compounding method to form a wear-resistant layer.

Further, the position of the lowermost end of the connecting sleeve 13 is directly related to the guiding action received by the spool 51. The lower end of the connecting sleeve 13, the better the guiding function. That is, the length of the second insertion portion 132 of the connection sleeve 13 is longer, so that the sealing component 60 is located as far as possible in the axial direction of the electric valve, the guiding effect on the valve core 51 is increased, the movement rigidity of the valve core 51 is better, the strength of the valve core 51 is ensured, the service life of the electric valve is prolonged, meanwhile, the coaxiality between the valve core 51 and the inner bushing 24 is better, the interference of the inner bushing 24 on the valve core 51 is improved and even avoided, and the improvement of inner leakage is facilitated.

However, the length of the second insertion portion 132 of the connection sleeve 13 cannot be too long, otherwise, when the electric valve is fully opened, the flow area between the first connection port 121 and the second connection port 211 of the electric valve is reduced, which adversely affects the flow of fluid between the first connection port 121 and the second connection port 211, and lowers the CV value when the electric valve is fully opened. For this, the length of the second insertion portion 132 of the connection sleeve 13 protruding into the lower valve body 12 should be controlled. As shown in FIG. 1, if the vertical distance between the lower end of the connecting sleeve 13 and the central axis of the first connecting port 121 is L, then L is greater than 0 and less than or equal to 2.5 mm. With such a design, the CV value at the time of full opening of the electric valve can be taken into consideration while ensuring that the valve body 51 is sufficiently guided.

As shown in FIG. 1, the valve core 51 and the sealing member 60 are in clearance sliding fit, but the clearance is small, when there are impurities such as small particles in the fluid, the impurities may be retained at the clearance where the valve core 51 and the sealing member 60 are fitted, and over time, the valve core 51 may be stuck or even jammed during the axial movement. For this purpose, a receiving groove is formed in the inner wall of the lower limiting member 64. For convenience of processing, in this embodiment, the receiving groove is a ring-shaped annular groove formed along the inner wall of the lower retainer 64.

It will be appreciated that the receiving groove may also open on the outer wall of the spool 51. A housing groove is opened as an impurity housing groove in an outer wall of the valve body 51 that is in clearance fit with the seal member 60.

The number and specific shape of each impurity housing groove are not limited as long as the function of the impurity housing groove can be realized. Above-mentioned impurity holding tank can avoid the case card that impurity such as little metal particle arouses to pause or even card dead phenomenon.

The electrically operated valve may be used as a valve that functions only as a switch, or may be used as an electronic expansion valve that functions as a flow rate regulator. When the valve body 51 is separated from the seal portion 231 of the seal ring 23, the flow rate of the electric valve can be changed while the valve body 51 slides in the axial direction.

In the electric valve shown in fig. 1, the valve chamber of the electric valve includes an upper chamber a located above the connecting frame 42, a middle chamber B located between the connecting frame 42 and the sealing member 60, and a lower chamber C located between the sealing member 60 and the valve seat member 20. As shown in fig. 1 and 3, the valve housing 52 includes a radial through hole 5210, and particularly, the radial through hole 5210 may be provided in a wall portion of the second sliding portion 5212 of the valve housing 52. When the electric valve is opened, the first connection port 121 is communicated with the second connection port 211, and when the electric valve is closed, the second connection port 211 is communicated with the second axial passage 5111 of the valve core 51, the inner cavity of the valve sleeve 52, the radial through hole 5210 and the first axial passage 421 of the connecting frame 42, that is, the electric valve comprises a balance passage, the balance passage comprises the second axial passage 5111 of the valve core 51, the inner cavity of the valve sleeve 52, the radial through hole 5210 and the first axial passage 421 of the connecting frame 42, and the balance passage enables the upper cavity a, the middle cavity B, the inner cavity of the valve core member 50 and the second connection port 211 of the electric valve to be communicated, thereby facilitating the valve opening action of the electric valve.

The method of assembling the motor-operated valve will be described in detail below. The assembly method of the electric valve mainly comprises the following steps:

the lower valve body 12 and the connecting sleeve 13 are fixedly connected, specifically, the lower valve body 12 and the connecting sleeve 13 can be fixedly connected through argon arc welding, laser welding or furnace welding to form a first assembling component a, and then the first assembling component a and the first connecting pipe 14 are fixedly welded through furnace welding. Or, the lower valve body 12, the connecting sleeve 13 and the first connecting pipe 14 are welded and fixed together by furnace welding, so that the valve is more convenient and economic.

And (5) assembling the rotor assembly b, namely fixedly connecting the rotor 31 and the fixed frame 32 in an injection molding mode to form the rotor assembly b.

The nut assembly c is assembled to fixedly connect the nut 41 to the connecting frame 42. Specifically, the nut 41 and the connecting frame 42 may be fixedly connected together by injection molding.

Assembling a screw rod assembly d: the screw 33, the bearing 34 and the connecting member 35 are assembled. The connecting piece 35 is sleeved below the radial protrusion 331 of the screw rod 33, the bearing 34 is sleeved between the radial protrusion 331 and the lower end of the screw rod 33, and the bearing inner ring 341 of the bearing 34 is fixedly connected with the lower end of the screw rod 33, specifically, the lower end of the screw rod 33 can be riveted or welded with the bearing inner ring 341, or can be fixedly connected in other manners, as long as the bearing inner ring 341 and the screw rod 33 can move synchronously.

The valve housing 52 is assembled with the lead screw assembly d. Movably connecting the valve sleeve 52 with the screw rod assembly d: specifically, the bearing 34 and the connecting member 35 are inserted into the valve housing 52, so that the connecting member 35 is seated on the supporting portion 520 of the valve housing 52, and then the upper end of the valve housing 52 and the connecting member 35 are riveted to form a valve housing screw rod assembly e, in the process, the valve housing 52 and the screw rod 33 are indirectly movably connected through the bearing 34 and the connecting member 35.

A bearing seat 53, an elastic member 54 (specifically, a compression spring in this embodiment) and a filter member 55 are sequentially installed in an inner cavity of the valve housing 52 and below the bearing 34, and then the valve element 51 and the valve housing 52 are fixedly connected to form a valve element screw assembly f.

The first pre-assembly 600 is formed by fitting the sealing member 60 around the valve core screw assembly f. As shown in fig. 6, the second thin-walled portion 512 of the valve body 51 includes a diameter-enlarged portion 5121. The outer diameter of the enlarged diameter portion 5121 is larger than the outer diameter of the base portion 510. After the sealing member 60 is fitted into the outer periphery of the valve body 51 from above the valve body screw assembly e, the sealing member 60 is not removed from the lower end of the valve body 51 due to the provision of the enlarged diameter portion 5121.

The valve seat member 20 is assembled. The valve seat body 21 and the second connecting pipe 25 are fixed by welding, specifically, they may be fixed by furnace welding. Thereafter, the seal ring 23 and the inner liner 24 are fixedly connected to the valve seat body 21. The lower end surface of the press ring 22 is placed against the valve seat body 21 and the seal ring 23, and the upper end of the valve seat body 21 and the press ring 22 are caulked.

The lower end of the first pre-assembly member 600 is inserted into the first assembly member a from the upper end of the first assembly member a, and the lower end of the connecting sleeve 13 of the first assembly member a is riveted with the lower limiting member 64. I.e., the lower end of the connecting sleeve 13, serves as the aforementioned second axial stopper 136. The seal member 60 is axially retained between the first axial retention portion 135 and the second axial retention portion 136. It will be understood that the lower end of the connecting sleeve 13 may also be welded to the lower retainer 64, if applicable.

The lower valve body 12 and the valve seat body 21 are welded and fixed.

And welding and fixing the connecting piece 42 of the nut component c and the connecting sleeve 13. Specifically, the connecting frame 42 of the nut component c and the connecting sleeve 13 are pre-positioned, so that the outer wall of the connecting frame 42 is in clearance fit with the connecting sleeve 13, and then the connecting frame 42 and the connecting sleeve 13 are welded and fixed. The connecting frame 42 and the connecting sleeve 13 can be welded and fixed by laser welding or argon arc welding.

And D, welding and fixing the fixed frame 32 in the rotor assembly b with the screw rod 33 of the screw rod assembly D in the step D.

And welding and fixing the upper valve body 11 and the connecting sleeve 13 to complete the assembly of the valve member 100. Specifically, the upper valve body 11 is seated on the first positioning portion 1301 of the connecting sleeve 13, and the upper valve body 11 and the connecting sleeve 13 are fixed by laser welding.

The electrically operated valve provided in the present application is described above by way of example. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. The utility model provides an electrically operated valve, its characterized in that, includes valve body part, valve seat part, nut part, rotor part and case part, nut part with valve body part fixed connection, the rotor part can drive the case part is followed the axial displacement of valve body part, the nut part includes the nut, the rotor part includes rotor and lead screw, the nut with lead screw threaded connection, the case part includes valve barrel and case, the valve barrel roughly is cylindricly, the case roughly is the cylindric that the axial link up, the valve barrel with lead screw swing joint, the lead screw can drive the valve barrel axial displacement, the valve barrel with case fixed connection, the case can with the sealing portion butt or the separation of valve seat part, the nut includes the guiding hole section, the valve barrel at least part is located the guiding hole section, the valve sleeve is in clearance sliding fit with the guide hole section.

2. The electrically operated valve of claim 1, wherein said valve housing includes a sliding fit portion, said sliding fit portion including a first sliding portion and a second sliding portion, an outer diameter of said first sliding portion being smaller than an outer diameter of said second sliding portion, said pilot bore section of said nut including a small bore section and a large bore section, said first sliding portion being slidably engageable with a gap in said small bore section, said second sliding portion being slidably engageable with a gap in said large bore section.

3. The electric valve according to claim 1 or 2, wherein the valve housing further comprises a side protrusion and a downward extension, the outer diameter of the side protrusion is larger than that of the sliding fit part, the outer diameter of the side protrusion is larger than that of the downward extension, the downward extension extends into the inner cavity of the valve core, the upper end of the valve core abuts against the side protrusion, and the valve core and the valve housing are welded and fixed.

4. The electric valve according to claim 1 or 2, wherein the electric valve comprises a first interface portion and a second interface portion, the nut member comprises a first axial channel, the valve element comprises a second axial channel and a radial through hole, the first interface portion communicates with the second interface portion when the electric valve is in the open state, and the first axial channel, the second axial channel, the radial through hole, and the second interface portion of the valve seat member communicate when the electric valve is in the closed state.

5. The electric valve according to claim 1 or 2, wherein the valve body component further comprises an upper valve body, a lower valve body and a connecting sleeve, the upper valve body comprises a first connecting port, the lower valve body comprises a second connecting port, the upper valve body is a stainless steel tensile member, the lower valve body is a stainless steel tensile member, the upper valve body is welded and fixed with the connecting sleeve, the lower end of the connecting sleeve extends into the lower valve body, a sealing component is arranged between the connecting sleeve and the valve core, the sealing component comprises a sealing element, the inner wall of the sealing element is attached to the outer wall of the valve core, and the valve core can axially slide relative to the sealing component.

6. The electric valve according to claim 3, wherein the valve seat component comprises a valve seat and a sealing ring made of a non-metallic material and fixedly connected with the valve seat, the sealing ring comprises the sealing portion, the rotor component comprises a bearing, the bearing comprises an outer bearing ring and an inner bearing ring, the inner bearing ring is fixedly connected with the screw rod, the valve core component further comprises a bearing seat and an elastic member, the bearing seat is abutted with the outer bearing ring, one end of the elastic member is abutted with the bearing seat, and the other end of the elastic member is abutted with the valve core.

7. The electrically operated valve of claim 6, wherein said bearing housing comprises a first support section and a second support section, said first support section having an outer diameter smaller than an outer diameter of said second support section, said valve housing comprising a first bore section and a second bore section, said first bore section having an inner diameter smaller than an inner diameter of said second bore section, said first support section being in clearance sliding engagement with said first bore section, said second support section being in clearance sliding engagement with said second bore section, an upper end of said second support section always having an axial clearance with said valve housing.

8. The electric valve according to claim 7, wherein the valve core component further comprises a filter component, the filter component comprises a filter element and a fixing ring, the valve core comprises a filter element support portion, the fixing ring is seated on the filter element support portion, and the lower end of the elastic member is sleeved outside the filter element.

9. The electric valve according to claim 8, wherein the valve core comprises a base portion, a first thin wall portion and a second thin wall portion, the first thin wall portion is disposed on one side of the base portion, the second thin wall portion is disposed on the other side of the base portion, the base portion comprises the filter member support portion, a guide section is included between the first thin wall portion and the base portion, and the fixing ring is axially retained between a lower end of the downward extension portion and the filter member support portion.

10. The electrically operated valve according to claim 7, wherein the valve body includes a base portion, a first thin portion provided on one side of the base portion, and a second thin portion provided on the other side of the base portion, one end of the elastic member abuts against the bearing seat, and the other end of the elastic member abuts against an upper end of the base portion.

11. The electric valve of claim 6, wherein the rotor member further comprises a connecting member, the connecting member is fixedly connected to the valve sleeve, the connecting member is sleeved on an outer peripheral portion of the screw rod, the screw rod comprises a radial protrusion, the connecting member is axially limited between the radial protrusion and the bearing, when the electric valve is in an open valve state, an upper end of the outer ring of the bearing abuts against the connecting member, and when the electric valve is in a closed valve state, a displacement amount is provided between the upper end of the outer ring of the bearing and the connecting member.

12. The electric valve according to claim 3, wherein the rotor is in clearance fit with the upper valve body, the nut member comprises a connecting frame fixedly connected with the nut, the connecting frame is fixedly connected with the connecting sleeve, the connecting sleeve is substantially cylindrical, the connecting sleeve comprises a first insertion portion, a second insertion portion and a connecting portion, the first insertion portion is located inside the upper valve body, the second insertion portion is located inside the lower valve body, the outer diameter of the connecting portion is larger than that of the first insertion portion, the outer diameter of the connecting portion is larger than that of the second insertion portion, the connecting portion is located between the upper valve body and the lower valve body, the first insertion portion comprises a first radial positioning portion, the second insertion portion comprises a second radial positioning portion, and the inner wall of the upper valve body is in interference fit with the first radial positioning portion, the inner wall of the lower valve body is in interference fit with the second radial positioning portion, the upper valve body is welded and fixed with the connecting portion, and the lower valve body is welded and fixed with the connecting portion.

13. The electric valve according to claim 5, wherein the rotor is in clearance fit with the upper valve body, the nut member comprises a connecting frame fixedly connected with the nut, the connecting frame is fixedly connected with the connecting sleeve, the connecting sleeve is substantially cylindrical, the connecting sleeve comprises a first insertion portion, a second insertion portion and a connecting portion, the first insertion portion is located inside the upper valve body, the second insertion portion is located inside the lower valve body, the outer diameter of the connecting portion is larger than that of the first insertion portion, the outer diameter of the connecting portion is larger than that of the second insertion portion, the connecting portion is located between the upper valve body and the lower valve body, the first insertion portion comprises a first radial positioning portion, the second insertion portion comprises a second radial positioning portion, and the inner wall of the upper valve body is in interference fit with the first radial positioning portion, the inner wall of the lower valve body is in interference fit with the second radial positioning part, the upper valve body is welded and fixed with the connecting part, the lower valve body is welded and fixed with the connecting part, the sealing part comprises an upper limiting part, a lower limiting part, a sealing ring and a sliding sheet, the sealing ring and the sliding sheet are arranged between the upper limiting part and the lower limiting part, the sealing ring is sleeved on the periphery of the sliding sheet, the outer wall of the sealing ring is in fit sealing with the inner wall of the first insertion part, the inner wall of the sliding sheet is in fit sealing with the outer wall of the valve element, the inner surface of at least one of the upper limiting part, the sliding sheet and the lower limiting part is plated with Ni-P-PTFE or DW + PTEF by a chemical composite method, the vertical distance between the lower end of the connecting sleeve and the central axis of the first connecting port part is L, and then the L is 0< L and is not more than 2.5 mm.