CN115560094A - Electrically operated valve and assembly method thereof - Google Patents

Abstract

An electric valve and an assembling method thereof comprise a first positioning part and a second positioning part, wherein the first positioning part is positioned at one end of a valve core far away from a control device, the second positioning part is positioned at one end of the valve core close to the control device, the central axis of the first positioning part is coincided with or tends to be coincided with the central axis of a valve body cavity, the central axis of the second positioning part is coincided with or tends to be coincided with the central axis of the valve body cavity, the end surface of the first end of the valve core is abutted against the first positioning part in the axial direction of the electric valve, and the second end of the valve core is abutted against or in clearance fit with the second positioning part, so that the valve core is positioned; in addition, the first positioning part is in clearance fit or sliding fit with the outer peripheral surface of the valve core, the second positioning part is also in clearance fit or sliding fit with the outer peripheral surface of the valve core, and the valve core is limited in the circumferential direction, so that the inclination or vertical floating of the valve core under the action of fluid pressure is improved, and the stability of the electric valve is improved.

Description

Electrically operated valve and method of assembling the same

Technical Field

The application relates to the field of fluid control, in particular to an electric valve and an assembling method thereof.

Background

The electric valve can be applied to a vehicle refrigerant circulating system and comprises an output shaft and a valve core, the output shaft is in transmission connection with the valve core and can drive the valve core to rotate, and the electric valve controls the on-off or switching of fluid through the rotation of the valve core. Because the fluid directly or indirectly applies pressure to the valve core, the valve core may incline or float up and down under the action of the fluid pressure, and the situation that the valve core is directly clamped by the sealing assembly or the output shaft cannot drive the valve core to rotate may occur, so that the stability of the electric valve is influenced.

Disclosure of Invention

The invention aims to provide an electric valve and an assembling method thereof, which are beneficial to improving the inclination or up-and-down floating of a valve core under the action of fluid pressure and improving the stability of the electric valve.

In order to achieve the purpose, the following technical scheme is adopted in the application:

an electric valve comprises a control device, a valve body and a valve core, wherein the valve body is provided with a valve body cavity, the valve core is positioned in the valve body cavity, the control device is provided with an output shaft, the output shaft is in transmission connection with the valve core, the control device is fixedly connected with the valve body, the electric valve further comprises a first positioning part and a second positioning part, the first positioning part is positioned on one side of the valve core, which is relatively far away from the control device, along the axial direction of the electric valve, the second positioning part is positioned on one side of the valve core, which is relatively close to the control device, the central axis of the first positioning part is overlapped or tends to be overlapped with the central axis of the valve body cavity, one end of the valve core, which is relatively far away from the control device, is a first end, one end of the valve core, which is relatively close to the control device, is a second end, the end face of the first end of the valve core is abutted against the first positioning part, and the peripheral face of the valve core is in clearance fit or sliding fit with the first positioning part; the central axis of the second positioning part coincides with or tends to coincide with the central axis of the valve body cavity, the second positioning part is abutted against or in clearance fit with the valve core along the axial direction of the electric valve, and the second positioning part is in clearance fit or sliding fit with the outer peripheral surface of the valve core.

A method of assembling an electrically operated valve comprising the steps of:

the first positioning part and the valve body are pressed in an interference fit mode: comprises pressing the first positioning part downwards from the opening cavity at the upper part of the valve body to the bottom of the valve body cavity;

assembly of the sealing assembly, the elastic assembly and the valve body: the first sealing element and the first valve seat are assembled into a sealing assembly, and the sealing assembly is pressed into the first concave part of the valve body from the opening cavity at the upper part of the valve body; the elastic component and the second valve seat are assembled to form an elastic component, and the elastic component is pressed into a second concave part of the valve body downwards from an opening cavity at the upper part of the valve body;

installing a valve core: the valve core is inserted into the valve body cavity from the opening cavity at the upper part of the valve body downwards, so that the lower end of the valve core is in limit fit with the first positioning part, and the valve core is extruded and limited by the sealing component and the elastic component in the radial direction;

installation of the second positioning part: and pressing the second positioning part into the valve body from the opening cavity at the upper part of the valve body to be abutted against the valve body.

According to the electric valve and the assembling method thereof, the first positioning part and the second positioning part are respectively arranged at the two ends of the electric valve, in the axial direction of the electric valve, the end face of the first end of the valve core is abutted to the first positioning part, and the second end of the valve core is abutted to the second positioning part or in clearance fit, so that the valve core is positioned; in addition, the first positioning part is in clearance fit or sliding fit with the outer peripheral surface of the valve core, the second positioning part is also in clearance fit or sliding fit with the outer peripheral surface of the valve core, the valve core is limited in the circumferential direction, the inclination or up-and-down floating of the valve core under the action of fluid pressure is favorably improved, and the stability of the electric valve is favorably improved.

Drawings

Figure 1 is a schematic perspective view of a first embodiment of an electrically operated valve;

figure 2 is a schematic cross-sectional view of the electrically operated valve of figure 1;

FIG. 3 is a cross-sectional structural view of the valve body of FIG. 2;

FIG. 4 is an angular perspective view of the valve cartridge of FIG. 2;

FIG. 5 is a side view angle schematic of the valve cartridge of FIG. 2;

FIG. 6 is a schematic view of the main angle configuration of the valve cartridge of FIG. 2;

FIG. 7 isbase:Sub>A schematic cross-sectional view of the valve cartridge of FIG. 6 taken along the line A-A;

FIG. 8 is a schematic cross-sectional view of the valve cartridge of FIG. 6 taken along the direction B-B;

FIG. 9 is a cross-sectional view of the first detent shown in FIG. 2;

figure 10 is a cross-sectional view of the second locator of figure 2;

FIG. 11 is a perspective view of the first valve seat of FIG. 2;

FIG. 12 is a schematic illustration of the assembly of the valve cartridge and valve body of FIG. 2;

figure 13 is a schematic view of the first opening portion of the first embodiment of the electrically operated valve in communication;

figure 14 is a schematic cross-sectional view of the electrically actuated valve of figure 13 taken along the line C-C;

figure 15 is a schematic cross-sectional view of the electrically operated valve of figure 13 taken along direction D-D (the valve body not shown);

figure 16 is a schematic cross-sectional view of a second embodiment of the electrically operated valve;

FIG. 17 is a perspective view of a second embodiment of the first valve seat.

Detailed Description

The invention is further described with reference to the following figures and specific examples:

the electric valve can be applied to a vehicle thermal management system or an air conditioning system, and particularly can be applied to a circulating flow path of high-pressure fluid such as refrigerant and the like, wherein the vehicle thermal management system comprises a new energy vehicle thermal management system. Referring to fig. 1 to 15, an electric valve according to an embodiment of the present invention may be applied to a refrigerant circulation flow path. The electric valve 100 comprises a control device 1, a valve body assembly 2 and a valve core 4, wherein the valve body assembly 2 is provided with a valve body cavity 210, and the valve core 4 is positioned in the valve body cavity 210. The control device 1 comprises an output shaft 11, the output shaft 11 outputs torque, the output shaft 11 is in transmission connection with the valve core 4, the control device 1 is fixedly connected with the valve body assembly 2, and the electric valve 100 is electrically connected with the outside through the control device 1 and/or in signal connection.

Referring to fig. 2 and 3, the valve body assembly 2 includes a valve body 21, a valve body cavity 210 is located in the valve body 21, and the valve body 21 further includes an opening portion 213 and at least two flow portions. The opening portion 213 forms an opening chamber 2130, and the opening chamber 2130 is located closer to the control device 1 than the valve body chamber 210 in the direction of the axis OO' of the electric valve (hereinafter referred to as the electric valve axial direction). As for the individual parts of the valve body 21, the opening chamber 2130 communicates with the valve body chamber 210, and part of the control device 1 is located in the opening chamber 2130. In the present embodiment, the valve body 21 includes two flow portions, a first flow portion 211 and a second flow portion 212. The first flow through portion 211 has a first passage 2111 and a first port 2112, the first port 2112 being located in the outer wall surface of the valve body 21, the first passage 2111 being located inside the valve body 21, the first port 2112 communicating with the first passage 2111. The second flow passage 212 has a second passage 2121 and a second orifice 2122, the second orifice 2122 is located on the outer wall surface of the valve body 21, the second orifice 2122 and the first orifice 2112 are respectively located on two opposite outer wall surfaces of the valve body 21, one of the first passage 2111 and the second passage 2121 serves as an inlet passage of the electric valve, the other serves as an outlet passage, and correspondingly, one of the first orifice 2112 and the second orifice 2122 serves as an inlet of the electric valve, and the other serves as an outlet of the electric valve. The valve body cavity 210 is located between the first passage 2111 and the second passage 2121, and in a state where the valve core 4 is not installed, referring to fig. 3, for only a single component of the valve body 21, the first passage 2111 and the second passage 2121 communicate through the valve body cavity 210, the first passage 2111 and the second passage 2121 are respectively located on different sides of the valve body cavity 210, the first passage 2111 is closer to the control device 1 than the second passage 2121 along the axial direction of the electric valve, the first passage 2111 and the second passage 2121 are axially staggered, and the first passage 2111 and the second passage 2121 are axially staggered

The height difference h1 is formed between the two parts, and the inlet channel and the outlet channel are not at the same height due to the height difference h1, so that the design of the valve core is facilitated. When the height difference h1 is too large, a large pressure drop loss is generated when the high-pressure refrigerant flows through, so that the height difference is not suitable to be too large. The height difference between the first channel 2111 and the second channel 2121 herein refers to the height difference between the centerline of the first channel 2121 and the centerline of the second channel 2121.

The valve core 4 has various forms, and can be spherical, needle-shaped, cylindrical and the like. Referring to fig. 2 and 4-8, in the embodiment, the valve core 4 is substantially cylindrical, that is, the valve core 4 is specifically a valve core column, and the corresponding electric valve is specifically an electric column valve. The axis of the valve core 4 substantially coincides with the axis of the electric valve 100, the valve core 4 includes a first opening 410, a second opening 420 and a duct 430, the first opening 410 is closer to the control device 1 than the second opening 420 along the axial direction of the electric valve, the central axis of the first opening 410 and the central axis of the second opening 420 similarly have a height difference h1, referring to the direction shown in fig. 2, the first opening 410 and the second opening 420 are arranged in a staggered manner along the axial direction of the valve core, the second opening 420 is completely below the first opening 410, the first opening and the second opening have a gap h2 along the axial direction of the valve core, the gap h2 is larger than the width of a sealing area for sealing the first opening or the second opening, in this embodiment, specifically, the gap h2 between the lower end of the first opening 410 and the upper end of the second opening 420, and the gap h2 is at least larger than the width h3 of the sealing area for sealing the first opening 410, which can be arranged to enable the first opening 410 and the second opening 420 not to be located on the same circumference of the valve core, which can facilitate reducing the diameter of the valve core 4 and can facilitate reducing the radial size of the valve body, and can be enough throttling groove of the valve body. In this embodiment, the first opening 410 and the second opening 420 are both located on the outer peripheral surface 40 of the valve core 4, the port 430 is located inside the valve core 4, the port 430 is partially arranged along the axial direction of the valve core, so that the valve core is at least partially hollow, and the port 430 communicates with the first opening 410 and the second opening 420. The second opening 410 may be a through hole with a larger diameter or a plurality of through holes with smaller diameters, and in the embodiment, the second opening 420 includes a plurality of first through holes 420a, and the plurality of first through holes 420a are uniformly distributed along the outer circumferential surface 40 of the valve core 4. The second opening 420 is communicated with the second passage 2121, the central axis of the first opening 410 is basically coincident with the central axis of the first passage 2111, the first opening 410 and the first passage 2111 can be completely communicated or partially communicated or not communicated by rotating the valve core 4, and the second opening 420 is always in an open state no matter where the valve core 4 is located, so that the pressure drop loss of refrigerant flowing through the valve core is reduced. The second aperture 2122 may serve as an inlet of the electric valve, the first aperture 2112 serves as an outlet of the electric valve, and refrigerant enters the second aperture 2122, flows through the second passage 2121, and enters the orifice 430 in the interior of the valve core 4 from the second opening 420, the control device 1 rotates the valve core 4 via the output shaft 11 such that the first opening 410 is at least partially in communication with the first passage 2111, and refrigerant can exit the valve core from the first opening 410 and exit the electric valve 100 from the first aperture 2112 via the first passage 2111. When the first opening 410 is not communicated with the first passage 2111 completely, i.e. when the electric valve is closed, the refrigerant filled in the orifice 430 of the valve core 4 cannot exit from the first opening 410. It will be appreciated that the second port 2122 may also serve as an outlet of the electrically operated valve and the corresponding first port 2112 serves as an inlet of the electrically operated valve.

In addition, the valve core 4 further has a throttle groove 440, the throttle groove 440 is recessed inward from the outer peripheral surface of the valve core 4, the throttle groove 440 is communicated with the first opening 410, specifically, the throttle groove 440 extends from the first opening 410 end of the valve core 4 along the valve core outer peripheral surface 40, and the second opening 420 end is always in a normally open state, so that the throttle groove is not required to be provided. The cross-sectional shape of the throttle groove 440 along the axial direction of the valve element may be V-shaped, rectangular or other shapes, in this embodiment, the cross-sectional shape of the throttle groove 440 along the axial direction of the valve element is V-shaped, the throttle groove 440 has a head end 441 and a tail end 442, the head end 441 is located on the outer circumference forming the first opening 410, from the head end 441 to the tail end 442, the groove width of the throttle groove 440 gradually decreases, and the groove depth of the throttle groove 440 gradually decreases. Here, the groove width refers to the width of the throttle groove in the axial direction of the valve element, and the groove depth refers to the depth of the throttle groove in the radial direction of the valve element. As shown in fig. 8, fig. 8 is a cross section 480 of the valve element perpendicular to the valve element axis, and since the first opening 410 and the second opening 420 are arranged in a staggered manner along the axial direction of the valve element 4, the circumference of the valve element where the center of the first opening 410 is located is taken as a reference, except for the first opening 410 and a sealing area required for reserving a fully closed state, the circumferences of the remaining valve element 4 can be taken as areas for forming the throttling groove, for example, 90 ° is reserved for the first opening 410 and the sealing area required for the fully closed state, so that the covering angle of the throttling groove 440 on the circumference of the valve element 4 can reach 270 °, that is, based on the outer circumferential surface 40 of the valve element 4 for forming the throttling groove 440, an included angle α between a connecting line between a head end 441 of the throttling groove 440 and a circle center of the cross section 480 and a connecting line between a tail end 442 of the throttling groove 440 and the circle center of the cross section 480 can reach 100-270 ° or more, and in this embodiment, the included angle α is specifically 138 °. The projection of the groove bottom of the throttling groove 440 on the cross section 480 perpendicular to the axis of the valve core is a part of a spiral line, namely, the throttling groove 440 is in the direction of the spiral line, which is beneficial to the smoothness and uniformity of the flow curve of the electric valve. Under the condition that the flow of the electric valve is the same, the larger the angle of the throttling groove 440 occupied on the outer peripheral surface of the valve core is, the more gradual the throttling area change of the throttling groove is along the length direction of the throttling groove, the better the linearity of the flow curve of the electric valve is, the easier the accurate control can be realized through software, and the control precision can be improved. In addition, referring to fig. 5, the slot edge of the throttle slot 440 has an angle β with the centerline of the throttle slot 440, and the angle β is within 0 to 30 °. Generally, the smaller the beta included angle is, the thinner the throttle groove 440 is, the more gradual the change of the throttle area of the throttle groove is along the length direction of the throttle groove, and the better the linearity of the electric valve flow curve is, which is beneficial to improving the control precision; when the slot edge of the throttle slot 440 is an arc, the included angle β is the angle between the tangent of the slot edge and the centerline of the throttle slot 440. Compared with a rectangular throttling groove, the V-shaped throttling groove is more convenient to machine by a cutter, burrs on the edge of the throttling groove are simpler to process, friction loss of the valve core and the sealing assembly can be reduced, and the service life of the electric valve is prolonged.

The electric valve 100 shown in fig. 2 is fully open, the first opening 410 is in full communication with the first passage 2111, and refrigerant enters the second port 2122, passes through the second passage 2121, the second opening 420, the orifice 430, the first opening 410, the first passage 2111, and exits the electric valve 100 from the first port 2112. Referring to fig. 13-15, fig. 13-15 are schematic views of the electric valve 100 partially open, wherein at least a portion of the throttling groove 440 is in communication with the first passage 2111, and wherein refrigerant entering the orifice 430 is able to flow along the throttling groove 440 into the first passage 2111 and exit the electric valve 100 through the first port 2112, the throttling groove 440 providing a throttling expansion effect. In the embodiment, a two-way valve is provided, and it can be understood that the electric valve can also be applied to a three-way valve or a multi-way valve in an expanded manner.

Referring to fig. 2 and 3, the electric valve 100 further includes a first positioning portion 22 and a second positioning portion 23, in the axial direction of the electric valve, the first positioning portion 22 is located on a side of the valve core 4 relatively far from the control device 1, and the second positioning portion 23 is located on a side of the valve core 4 relatively close to the control device 1. The valve body 21 has a first mounting groove 220, the first mounting groove 220 is close to the bottom of the valve body cavity 210, the opening of the first mounting groove 220 faces the control device 1, and a part of the first positioning portion 22 is located in the first mounting groove 220. As shown in fig. 9, the first positioning portion 22 has a generally convex cross section in the axial direction of the electric valve, and the central axis of the first positioning portion 22 coincides with or tends to coincide with the central axis of the valve body cavity 210, for example, it can be considered that the central axis of the first positioning portion 22 and the central axis of the valve body cavity 210 tend to coincide with each other when the offset between the central axis of the first positioning portion 22 and the central axis of the valve body cavity 210 is less than 0.02 mm. The first positioning portion 22 includes a first flange portion 222 and a first body portion 221, the first flange portion 222 extends from the first body portion 222 radially outward along the first positioning portion, a lower end surface of the first flange portion 222 abuts against a groove bottom wall forming the first mounting groove 220, an outer peripheral wall of the first flange portion 222 abuts against a groove side wall forming the first mounting groove 220, and the first positioning portion 22 is in interference fit with a groove wall forming the first mounting groove 220. The first positioning portion 22 has a second through hole 223, and the second through hole 223 is disposed along the axial direction of the first positioning portion 22 and penetrates the first positioning portion 22. The first positioning portion 22 further has a concave portion 224, which is defined as the up-down direction with the direction shown in fig. 2, and the concave portion 224 is formed to be concave inward from the lower end surface of the first flange portion 222. The first positioning portion 22 is press-fitted into the first mounting groove 220 from the open cavity 2130, the first positioning portion 22 is interference-fitted to the valve body 21, and the concave portion 224 provided at the lower end portion of the first flange portion 222 can reduce the contact surface area between the first positioning portion 22 and the valve body 21, which is small in contact surface and easy to ensure the flatness of the first positioning portion, thereby facilitating the ensuring of the coaxiality of the first positioning portion 22 and the valve body cavity 210; the second through hole 223 is provided to facilitate the discharge of gas in the first mounting groove 220 when the first positioning portion 22 is mounted in the valve body. In addition, in order to facilitate the assembly of the first positioning portion 22 and the valve body 21, a chamfered portion may be provided at the lower end of the first positioning portion 22, the chamfer of the chamfered portion being 30 ° or less. Defining one end of the valve core 4 relatively far from the control device 1 as a first end 41, one end of the valve core 4 relatively close to the control device 1 as a second end 42, and the first end 41 of the valve core has a positioning structure corresponding to the first positioning portion 22. One possible mounting structure is shown in fig. 2 and 7, wherein the duct 430 of the valve core 4 axially penetrates through the first end 41 of the valve core 4 along the valve core, part of the first main body portion 23 is located in the valve core 4, the first main body portion 23 of the first positioning portion 22 can be inserted into the first end 41 of the valve core 4 for positioning in a matching manner, the outer peripheral surface 40 of the valve core 4 is in clearance fit with the first flange portion 221, of course, the outer peripheral surface 40 of the valve core 4 may also be in sliding fit with the first main body portion 221, so that the valve core 4 can rotate in the circumferential direction, and the end surface 411 of the first end 41 of the valve core 4 is abutted to the first flange portion 222. As another embodiment, the hole does not penetrate through the first end of the valve core, and a positioning groove for engaging with the first positioning portion may be additionally provided at the first end of the valve core.

Referring to fig. 10, the second positioning portion 23 includes a second main body portion 231 and a second flange portion 232, the second flange portion 232 extends from the second main body portion 231 along the second positioning portion 23 in a radial direction, and at least a portion of the second main body portion 231 is closer to the first positioning portion 22 than the second flange portion 232 in an axial direction of the electric valve. The central axis of the second locating portion 23 coincides with or tends to coincide with the central axis of the valve body cavity 210, for example, the central axis of the second locating portion 23 may be considered to coincide with the central axis of the valve body cavity 210 with the central axis of the second locating portion 23 allowing an offset of less than 0.02 mm. The second positioning portion 23 has a third through hole 233, the second end 42 of the valve core 4 is at least partially located in the third through hole 233, and there is also a clearance fit between the second positioning portion 23 and the outer peripheral surface 40 of the valve column 4, that is, the inner diameter of the third through hole 233 is slightly larger than the outer diameter of the corresponding valve column 4, so that there is a certain clearance, for example, a clearance of 0 to 0.02mm, between the inner wall of the second positioning portion 23 and the outer wall of the valve column 4, and the clearance can enable the valve core 4 to rotate in the circumferential direction without being obstructed, and certainly, there may also be a sliding fit between the second positioning portion 23 and the outer peripheral surface 40 of the valve column 4. The valve body 21 has a first step portion 214, the first step portion 214 is located at the upper end of the valve body chamber 210, and the first step portion 214 is closer to the control device 1 than the valve body chamber 210; the valve core 4 has a second step portion 450, the second step portion 450 is located on one side of the second positioning portion 23 relatively far away from the control device 1, a step surface of the second step portion 450 is arranged opposite to a lower end surface of the second positioning portion 23 and has a certain gap, the second positioning portion 23 can axially limit upward movement of the valve core, and the valve core 4 cannot move upward any more until the valve core abuts against the second positioning portion 23. After the valve body 4 is assembled with the first positioning portion 22, the second positioning portion 23 is press-fitted into the valve body cavity 210 from the opening cavity 2130 until it abuts against the first stepped portion 214. Because high-pressure fluid such as refrigerant has high pressure, and the high-pressure fluid directly or indirectly applies pressure to the valve core when flowing through the valve core, the valve core may tilt or float up and down under the action of the pressure, and the situation that the valve core is directly blocked by the sealing assembly or the output shaft cannot drive the valve core to rotate may occur, so that the stability of the electric valve is affected. It is to be understood that, as other embodiments, the first positioning portion and the second positioning portion are not limited to the forms shown in the drawings, for example, the first positioning portion may be in the form of a groove, and a protrusion corresponding to the valve core is provided to cooperate with the first positioning portion.

Referring to fig. 2 and 11, the electric valve 100 further includes a sealing assembly 5, the sealing assembly 5 includes a first valve seat 51 and a first sealing member 52, and referring to fig. 11, the first valve seat 51 includes an arc surface 511 and a third flange portion 512, the third flange portion 512 extends outward from the main body portion of the first valve seat 51 along the radial direction of the valve body cavity, the first sealing member 52 is sleeved on the radial periphery of the third flange portion 512, along the radial direction of the valve body cavity 210, the arc surface 511 and the third flange portion 512 are located at two ends of the first valve seat 51, the arc surface 511 is formed by inward recessing from the main body portion of the first valve seat 51, and at least a part of the arc surface 511 is attached to the outer peripheral surface 40 of the valve element 4. The first valve seat 51 further has a fourth through hole 513, the fourth through hole 513 is provided through the first valve seat 51 in the radial direction of the valve body chamber, and the fourth through hole 513 is communicated with the first passage 2111.

The valve body 21 has a first recess 215, the first recess 215 defining a first cavity 2150, the first cavity 2150 being part of the valve body cavity 210, the first cavity 2150 being located on a side of the valve body cavity 210 adjacent the first passage 2111, the first cavity 2150 communicating with the first passage 2111, and at least a portion of the seal assembly 5 being located in the first cavity 2150. When viewed from the radial direction of the valve body cavity 210, the sealing assembly 5 is located on one side of the valve core 4 close to the first channel 2111, the arc-shaped surface 511 of the first valve seat 51 is at least partially attached to the outer peripheral surface 40 of the valve core 4, the arc-shaped surface 511 is attached to the outer peripheral surface 40 of the valve core 4, namely a sealing area, the diameter of the sealing area generally needs to be 3-5mm larger than that of the first opening 420, so that a good sealing effect is ensured, and the valve core 4 can be in sliding fit with the arc-shaped surface 511. Along the radial direction of the valve body cavity 210, the first sealing element 52 is compressed between the first concave part 215 and the first valve seat 51, the first sealing element 52 is in a sealing compression state, and the first sealing element 52 generates certain pressure on the valve core 4, and the pressure is beneficial to enhancing the sealing between the first valve seat 51 and the valve core 4. The width h3 of the aforementioned sealing region for sealing the first opening 410 is the width of the arc-shaped face 511 of the first valve seat.

The electric valve 100 further comprises an elastic assembly including a second valve seat 61 and an elastic member 62, the second valve seat 61 and the first valve seat 51 are symmetrically disposed about the central axis of the valve element 4, and the elastic member 62 and the first sealing member 52 are symmetrically disposed about the central axis of the valve element 4. The valve body 21 has a second recess 216, the second recess 216 forming a second cavity 2160, the second cavity 2160 being a part of the valve body chamber 210, the second cavity 2160 being located at a side of the valve body chamber 210 remote from the first passage 2111, the second valve seat 61 and the elastic member 62 being located at the second cavity 2160, the elastic member 62 being compressed between the second recess 216 and the second valve seat 61. The elastic member 62 and the second valve seat 61 play a role in balancing the pressure of the sealing assembly 5 on the valve element 4, so as to be beneficial to the force balance on two sides of the valve element 4, and for convenience in production and assembly, the structure of the second valve seat 61 is the same as that of the first valve seat 51, and the elastic member 62 is the same as that of the first sealing element 52, and may be an O-ring, for example. In this embodiment, the peripheral side of the first opening 410 is sealed to prevent the refrigerant from leaving the valve body 21 from the first opening 410 through the first passage 2111 and the first orifice 2112 when the electric valve is fully closed, and the difficulty in machining and manufacturing the valve element 4 can be reduced by only increasing the machining and manufacturing accuracy of the valve element on the first opening side without providing a sealing structure between the peripheral side of the second opening 420 and the second passage 2121. In addition, compared with a spherical valve core, the contact area between the cylindrical valve core and the valve seat is relatively reduced, and the driving force required by the control device is favorably reduced. The sealing assembly and the elastic assembly can support the valve core in the circumferential direction, the first sealing element and the elastic element provide holding force for the valve core to enable the valve core to be limited between the sealing assembly and the elastic assembly, and the valve core is in sliding fit with the first valve seat and the second valve seat, so that the possibility of inclination or excessive deviation of the valve core is reduced, and the coaxiality of the valve core and a valve body cavity is ensured.

Referring to fig. 5 and 12, in order to facilitate the installation of the valve core 4, the valve core 4 has a seating portion 460, the seating portion 460 is located at the first end 41 of the valve core 4, as shown in the lower end portion of fig. 5, the diameter of the seating portion 460 tends to decrease gradually along the direction away from the second end 42 of the valve core 4, at least a part of the diameter D1 of the seating portion 460 is smaller than the radial distance D2 between the first valve seat 51 and the second valve seat 61 when the valve core 4 is not installed, and the first sealing member 52 and the elastic member 62 are in the uncompressed state. The arrangement of the position placing part is beneficial to the valve core to pass through the area between the sealing component and the elastic component, and the position placing part also has the function of correcting the positions of the first valve seat and the second valve seat, so that the mass assembly of products is facilitated. The valve core 4 further has a plug cavity 470, the plug cavity 470 is located at the second end 42 of the valve core 4, and the first opening 410 is located between the seating portion 460 and the plug cavity 470 and the throttle groove 440 is also located between the seating portion 460 and the plug cavity 470 along the axial direction of the valve core 4.

The control device 1 further comprises a driving part and a transmission mechanism 14, the driving part comprises a rotor assembly 12 and a stator assembly 13, the stator assembly 13 is located on the periphery of the rotor assembly 12, the stator assembly 13 is electrically connected and/or in signal connection with a circuit board, the circuit board can be arranged in the control device, the circuit board also can not be located in the control device, the circuit board of the embodiment is not located in the control device, and the circuit board structure is not shown in the corresponding drawing. The rotor assembly 12 has a rotor cavity 120, at least a portion of the transmission 14 is located in the rotor cavity 120, and at least a portion of the transmission 14 is located in the rotor cavity 120, which facilitates reducing the axial height of the electric valve. After the stator assembly 13 is powered on, the stator assembly 13 generates an excitation magnetic field, the rotor assembly 12 drives the transmission mechanism 14 to rotate under the excitation of magnetic force, the transmission mechanism 14 drives the output shaft 11 to rotate, the output shaft 11 is in clearance fit with the valve core 4, the end part of the output shaft 11 is located in the insertion cavity 470 at the second end 42 of the valve core 4, and a certain clearance is reserved between the end part and the cavity wall forming the insertion cavity 470, the output shaft 11 rotates to drive the valve core 4 to rotate, so that the first opening 410 is partially or completely communicated or not communicated with the first channel 2111, when the first opening 410 is partially or completely communicated with the first channel 2111, the throttling groove 440 is communicated with the first channel 2111, when the first opening 410 is not communicated with the first channel 2111, the throttling groove 211440 is not communicated with the first channel 2111, and the flow control and on-off adjustment of the electric valve are realized. The structure of the control device is various, and is not limited to the structure given in the embodiment, and other control devices capable of driving the output shaft to move can be used as references; the transmission connection between the output shaft and the valve core can be in modes of clearance fit, interference fit and the like, and the output shaft can drive the valve core to rotate.

Referring to fig. 2, the control device 1 further includes a connecting seat 15, and a central axis of the connecting seat 15 coincides with or tends to coincide with a central axis of the spool chamber 210. The connecting seat 15 has a receiving cavity 150, a part of the transmission mechanism 14 is positioned in the receiving cavity 150, and the connecting seat 15 is fixedly connected with the valve body assembly 2. The connecting socket 15 has a fourth flange portion 151, the fourth flange portion 151 extends outward from a main body portion of the connecting socket 15 in a radial direction of the connecting socket 15, the connecting socket 15 has a hole portion 152, the hole portion 152 is located in a middle portion of the connecting socket 15 and axially penetrates through the connecting socket 15, a central axis of the hole portion 152 axially coincides with or tends to coincide with a center of the connecting socket 15, at least a portion of the output shaft 11 is located in the hole portion 152, and another portion of the output shaft 11 is located in the insertion cavity 470 of the valve element 4. The electric valve further comprises a compression nut 7, the compression nut 7 is sleeved on the radial periphery of the side wall of the main body part of the connecting seat 15, the compression nut 7 is abutted to one end face of the fourth flange part 151, and the compression nut 7 is in threaded connection with the valve body assembly 2, so that the connecting seat 15 is fixedly connected with the valve body assembly 2. Further, a sealing member is arranged between the connecting seat 15 and the valve body assembly 2, so that the refrigerant is prevented from leaking out of an assembly gap between the connecting seat 15 and the valve body assembly 2. Referring to fig. 3, the valve assembly 2 further includes a positioning pillar 24, and the positioning pillar 24 is matched with the connecting seat 15. The central axis of the connecting seat 15 coincides with or tends to coincide with the central axis of the valve core cavity 210, the central axis of the hole portion 152 coincides with or tends to coincide with the central axis of the connecting seat 15, the output shaft 11 penetrates through the hole portion 152 to be in transmission connection with the valve core 4, the coaxiality of the output shaft 11 and the valve body cavity 210 is guaranteed beneficially through the connecting seat 15, further, the coaxiality of the valve core 5 and the valve body cavity 210 is guaranteed beneficially through the first positioning portion 22 and the second positioning portion 23, and therefore the coaxiality of the output shaft 11 and the valve core 4 can be well guaranteed.

The present embodiment further provides an assembling method of a valve element, including:

the first positioning part 22 and the valve body 21 are pressed in an interference fit mode: the first positioning portion 22 is pressed downward into the first mounting groove 220 at the bottom of the valve body chamber 210 from the open chamber 2130 at the upper portion of the valve body 21.

Assembly of the sealing assembly 5, the elastic assembly and the valve body 21: the first sealing element 52 is sleeved on the third flange part 512 of the first valve seat 51 to form a sealing assembly 5, and the sealing assembly 5 is pressed into the first concave part 215 of the valve body 21 from the opening cavity 2130 at the upper part of the valve body; the elastic element 62 is sleeved on the flange part of the second valve seat 61 to form an elastic component, and the elastic component is pressed into the second concave part 216 of the valve body 21 from the opening cavity 2130; the assembly sequence of the sealing component and the elastic component can be changed.

Installation of the valve core 4: the valve core 4 is inserted into the valve body cavity 210 from the opening cavity 2130 at the upper part of the valve body, so that the first end 41 of the valve core 4 is in limit fit with the first positioning part 22 and the valve core 4 is pressed and limited by the sealing component and the elastic component in the radial direction of the valve body cavity;

mounting of the second positioning portion 23: the second positioning portion 23 is press-fitted from the opening chamber 2130 of the upper portion of the valve body to abut against the first stepped portion 214 of the valve body 21, and the second end 42 of the valve body 4 is positioned by the second positioning portion 23.

After the valve body assembly 2, the sealing assembly 5, the elastic assembly and the valve core 4 are assembled, the valve body assembly 2 presses in a positioning column 24 and a sealing element for preventing leakage, a rotor assembly 12, a transmission mechanism 14, a connecting seat 15 and an output shaft 11 in the control device 1 are assembled to form a valve component, the valve component is installed in the valve body 21 from an opening cavity 2130 on the upper portion of the valve body, the output shaft 11 is inserted into a splicing cavity 470 of the valve core 4, a compression nut 7 is screwed in, the valve component is fixed with the valve body assembly 2 through the compression nut 7, then a stator assembly 13 is pressed in from the upper portion of a rotor assembly 23 downwards and is fixed with the valve body assembly 2 through a screw, and the assembly of the electric valve is completed.

Referring to fig. 16, fig. 16 is another embodiment of the electric valve of the present application, the first opening 410 is still located on the outer peripheral surface 40 of the second end 42 of the valve element 4, and different from the previous embodiment, the second opening 420 of the valve element 4 in this embodiment is located on the end surface 411 of the first end 41 of the valve element 4 instead of on the outer peripheral surface 40 of the valve element 4, that is, the duct 430 is arranged to penetrate the first end 41 of the valve element 4 along the axial direction of the valve element, there is no need to provide a first through hole on the outer peripheral surface 40 of the valve element 4, the corresponding second channel 2121 and the first channel 2111 of the valve body 41 are not arranged in parallel, the second channel and the first channel 2111 of the valve body 41 are arranged at an angle of approximately 90 °, and the first channel 2112 and the second channel 2122 are located on the adjacent outer wall surface of the valve body 41. The structure of the first positioning portion 22 is adjusted due to the position change of the second opening 420, and the first positioning portion 22 also has the second through hole 223, but the diameter of the second through hole 223 is larger than that of the second through hole shown in fig. 2 and 9, and here, the second through hole 223 is used to communicate the second opening 420 with the second passage 2121, so that a larger diameter is required. The first positioning portion 22 has a third stepped portion 225, the third stepped portion 225 is used to limit the position of the first end 41 of the valve body 4, an end surface 411 of the first end 41 of the valve body 4 abuts against the third stepped portion 225, and the outer peripheral surface 40 of the first end 41 of the valve body 4 is at least partially positioned in the first positioning portion 22. The valve body 41 is provided with a fourth stepped portion 217 for restricting the mounting of the first positioning portion 22, and the first positioning portion 22 is at least partially in contact with the fourth stepped portion 217.

Referring to fig. 17, fig. 17 is a second embodiment of a first valve seat 51, and is different from the first valve seat shown in fig. 11, in this embodiment, a circle of annular protrusion 514 is further provided on an arc-shaped surface of the first valve seat 51, when the first opening is fully closed, the annular protrusion 514 abuts against an outer circumferential surface of the valve element, and the annular protrusion 514 changes a surface seal with a wider contact surface into a line seal or a surface seal with a smaller contact surface, which is beneficial to enhancing a sealing effect between the valve element and the first valve seat and preventing fluid from leaking.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims (12)

1. An electrically operated valve comprises a control device, a valve body and a valve core, wherein the valve body is provided with a valve body cavity, the valve core is positioned in the valve body cavity, the control device is provided with an output shaft, the output shaft is in transmission connection with the valve core, and the control device is fixedly connected with the valve body, and the electrically operated valve is characterized in that: the electric valve further comprises a first positioning part and a second positioning part, the first positioning part is positioned on one side of the valve core relatively far away from the control device along the axial direction of the electric valve, the second positioning part is positioned on one side of the valve core relatively close to the control device, the central axis of the first positioning part is coincided with or tends to be coincided with the central axis of the valve body cavity, one end of the valve core relatively far away from the control device is defined as a first end, one end of the valve core relatively close to the control device is a second end, the end face of the first end of the valve core is abutted against the first positioning part, and the outer peripheral face of the valve core is in clearance fit or sliding fit with the first positioning part; the central axis of the second positioning part coincides with or tends to coincide with the central axis of the valve body cavity, the second positioning part is abutted against or in clearance fit with the valve core along the axial direction of the electric valve, and the second positioning part is in clearance fit or sliding fit with the outer peripheral surface of the valve core.

2. An electrically operated valve as claimed in claim 1 wherein: the valve core is cylindrical, the valve body is provided with a first mounting groove, the opening of the first mounting groove faces the control device, at least part of the first positioning part is positioned in the first mounting groove, and the first positioning part is in interference fit with the first mounting groove; the valve body has a first stepped portion that is closer to the control device than the valve body cavity, the second positioning portion includes a second main body portion and a second flange portion that extends outward from the second main body portion in a radial direction of the second positioning portion, at least a part of the second main body portion is closer to the first positioning portion than the second flange portion in an axial direction of the electric valve, and the second flange portion abuts against the first stepped portion.

3. An electrically operated valve as claimed in claim 2, wherein: the second positioning part is provided with a third through hole, at least part of the second end of the valve core is positioned in the third through hole, and a gap is formed between the inner wall of the second positioning part and the outer peripheral surface of the valve core; the valve core is provided with a second step part, the second step part is positioned on one side, relatively far away from the control device, of the second positioning part, and the second step part and the second main body part are arranged in a clearance mode.

4. An electrically operated valve as claimed in claim 1, wherein: the valve element has a first opening, a second opening, and a bore, the first opening and the second opening are located on an outer peripheral surface of the valve element, the bore is located in the valve element and communicates the first opening and the second opening, the valve body includes a first flow portion and a second flow portion, the first flow portion and the first opening can be communicated or not communicated by rotating the valve element, the second flow portion and the second opening communicate, the first positioning portion includes a first flange portion and a first body portion, the first flange portion extends radially outward from the first body portion along the first positioning portion, an end surface of the first flange portion abuts against a groove bottom wall forming the first mounting groove, an end surface of the first end of the valve element abuts against the first flange portion, and at least a part of the first body portion is located in the valve element and is in clearance fit with the outer peripheral surface of the valve element.

5. An electrically operated valve as claimed in claim 4, wherein: the first positioning portion further has a recessed portion formed by being recessed inward from an end surface of the first flange portion; the first positioning part is provided with a second through hole which is arranged along the axial direction of the first positioning part and penetrates through the first positioning part; the lower end of the first positioning portion has a chamfered portion, and the chamfer of the chamfered portion is 30 ° or less.

6. An electrically operated valve as claimed in claim 1, wherein: the valve body comprises a first circulation part and a second circulation part, and the first circulation part is communicated with the first opening; the first positioning part is provided with a third step part, the end surface of the first end of the valve core is abutted against the third step part, and the first end of the valve core is at least partially positioned in the first positioning part; the first positioning portion has a second through hole axially provided therethrough, and the second through hole communicates the second opening and the second flow passage portion.

7. An electrically operated valve as claimed in claim 4 or 6 wherein: the electric valve further comprises a sealing assembly, the sealing assembly comprises a first valve seat and a first sealing piece, the first valve seat is provided with an arc-shaped surface, the arc-shaped surface is inwards recessed from the main body part of the first valve seat, at least part of the arc-shaped surface is attached to the outer peripheral surface of the valve core, the first valve seat is located on one side, close to the first flow-through part, of the valve body cavity, and the first sealing piece is pressed between the first valve seat and the valve body.

8. An electrically operated valve as claimed in claim 7 wherein: the electric valve further comprises an elastic assembly, the elastic assembly is located on one side, relatively far away from the first flow-through part, of the valve body cavity, the elastic assembly comprises a second valve seat and an elastic piece, the second valve seat and the first valve seat are symmetrically arranged relative to the central axis of the valve core, the elastic piece and the first sealing piece are symmetrically arranged relative to the central axis of the valve core, and the elastic piece is pressed between the second valve seat and the valve body.

9. An electrically operated valve as claimed in claim 7 wherein: the first valve seat is also provided with an annular bulge, the annular bulge is positioned on the arc-shaped surface, and the annular bulge is abutted to the outer peripheral surface of the valve core.

10. An electrically operated valve according to any one of claims 1 to 9, wherein: the control device comprises a rotor assembly, a stator assembly, a transmission mechanism and a connecting seat, wherein the rotor assembly is positioned on the inner periphery of the stator assembly, the rotor assembly is in transmission connection with the transmission mechanism, the connecting seat is provided with an accommodating cavity, part of the transmission mechanism is positioned in the accommodating cavity, and the central axis of the connecting seat is overlapped with or tends to be overlapped with the central axis of the valve body cavity; the connecting seat is provided with a hole part which penetrates through the connecting seat along the axial direction, the central axis of the hole part is axially overlapped or tends to be overlapped with the center of the connecting seat, the output shaft is at least partially positioned in the hole part, and the other part of the output shaft is in transmission connection with the valve core.

11. A method of assembling an electrically operated valve comprising the steps of:

the first positioning part and the valve body are pressed in an interference manner: comprises pressing a first positioning part downwards from an opening cavity at the upper part of a valve body to the bottom of the valve body cavity;

assembly of the sealing assembly, the elastic assembly and the valve body: the first sealing element and the first valve seat are assembled into a sealing assembly, and the sealing assembly is pressed downwards into a first concave part of the valve body from an opening cavity at the upper part of the valve body; the elastic component and the second valve seat are assembled to form an elastic component, and the elastic component is pressed into the second concave part of the valve body from the opening cavity at the upper part of the valve body;

installing a valve core: the valve core is inserted into the valve body cavity from the opening cavity at the upper part of the valve body downwards, so that the lower end of the valve core is in limit fit with the first positioning part, and the valve core is extruded and limited by the sealing component and the elastic component in the radial direction;

installation of the second positioning part: and pressing the second positioning part into the valve body from the opening cavity at the upper part of the valve body to be abutted against the valve body.

12. The method of assembling of claim 11, further comprising: the valve body is pressed into the positioning column and the sealing element for preventing leakage, a rotor assembly transmission mechanism, a connecting seat and an output shaft in the control device are assembled to form a valve component, the valve component is installed into the valve body from an opening cavity in the upper portion of the valve body, the output shaft is inserted into a splicing cavity of the valve core column, a compression nut is screwed in, the valve component and the valve body are fixed through the compression nut, then the stator component is pressed downwards from the upper portion of the rotor assembly, and the stator component and the valve body are fixed through screws.

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