CN212178009U - Electric valve - Google Patents

Abstract

The utility model provides an electrically operated valve, including the circuit board, stator module, the ground connection piece, stator module includes stator housing and winding, the winding is connected with the circuit board electricity, stator housing has first spacing portion and the spacing portion of second, the ground connection piece has first installation department and second installation department, first installation department is connected with first spacing portion and can realizes the fixed connection and the conductive connection of ground connection piece and stator housing in the axial, the second installation department makes the relative stator housing rotation of ground connection piece spacing with the first installation department and the first spacing portion combination of being connected of second installation department and second. The stator shell is electrically connected with the reference ground layer of the circuit board through the grounding piece, so that the interference of electromagnetism on the circuit board and electrical elements connected with the circuit board is reduced.

Description

Electric valve

Technical Field

The utility model relates to an electric valve.

Background

The electric valve is used in an air-conditioning refrigeration system, the electric valve comprises a stator component and a circuit board, the control signal of the circuit board controls the current of the stator component to realize the control of the electric valve, however, the electromagnetism gathered on the stator component reaches a certain strength and can interfere with the transmission of the control signal, thereby affecting the movement of the electric valve, and therefore, how to reduce the electromagnetic interference is a technical problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an motorised valve is favorable to reducing electromagnetic interference.

An electric valve comprises a circuit board and a stator assembly, wherein the stator assembly comprises a stator shell and a winding, the winding is electrically connected with the circuit board, the electric valve is provided with a first limiting part and a second limiting part, the first limiting part and the second limiting part are positioned on the stator shell, the electric valve further comprises a grounding piece, the grounding piece comprises an installation part and a main body part, the installation part is in conductive connection with the main body part, the installation part comprises a first installation part and a second installation part, the first installation part is connected with the first limiting part, and the fixed connection and the conductive connection between the grounding piece and the stator shell can be realized in the axial direction; the second installation part is matched with the second limiting part, the first installation part is connected and combined with the first limiting part to enable the grounding part to rotate and limit the stator shell, and the main body part is in conductive connection with the reference stratum of the circuit board.

According to the technical scheme, the first installation part of the grounding part is connected with the first limiting part of the stator assembly, the second installation part is matched with the second limiting part, so that the stator shell is conductive with the grounding part, the grounding part is then conductively connected with the reference stratum of the circuit board, the conductive connection of the stator shell and the reference stratum of the circuit board is realized, and the interference of electromagnetism gathered on the stator assembly on the circuit board and electrical elements connected with the circuit board is favorably reduced.

Drawings

Figure 1 is a schematic cross-sectional view of a first embodiment of an electrically operated valve;

FIG. 2 is a schematic view of the combined structure of the stator housing and circuit board shown in FIG. 1;

FIG. 3 is a schematic structural view of the stator housing shown in FIG. 1 prior to assembly with the grounding member;

FIG. 4 is a schematic structural view of the grounding member shown in FIG. 1;

FIG. 5 is a schematic view of the assembly structure of the stator housing and the grounding member before riveting;

fig. 6 is a schematic view of a combined structure of the stator housing and the grounding member after riveting;

FIG. 7 is a cross-sectional structural view of the nut of FIG. 1;

figure 8 is an enlarged partial cross-sectional schematic view of a second embodiment of the electrically operated valve;

figure 9 is a schematic cross-sectional view of a third embodiment of the electrically operated valve;

figure 10 is a schematic view of the stator housing of the fourth embodiment of the electrically operated valve before the grounding member is assembled;

fig. 11 is a schematic structural view of a stator housing of a fifth embodiment of an electric valve before a grounding member is assembled.

Detailed Description

In the description herein, which further illustrates the present invention in connection with the accompanying figures 1-11 and the detailed description, it is to be understood that the terms "central," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated with respect to the figures, merely to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Fig. 1 shows an embodiment of an electric valve 100, which can be applied in an air conditioning system for flow adjustment and on-off control of the system, and is particularly suitable for an automotive air conditioning system. The electric valve 100 includes a stator assembly 1, a circuit board 2, a valve member 3, and a valve body 4. The stator assembly 1 is positioned at the periphery of the valve member 3, and the stator assembly 1 is connected with the valve body 4. In this embodiment, the stator assembly 1 is a claw-pole type stator assembly, the stator assembly 1 includes a stator housing 11 and a winding 12, the winding 12 is located inside the stator housing 11, and the winding 12 is electrically/signal-connected to the circuit board 2. The electric valve also has a valve port 331, the valve part 3 includes a rotor assembly 31, a valve core 32, and a valve seat 33, when the electric valve works, the electric valve controls the stator assembly 1 to generate a changing excitation magnetic field by controlling the current passing through the winding 12 of the stator assembly to change according to a predetermined rule, the rotor assembly 31 in the valve part rotates under the action of the excitation magnetic field, and the rotor assembly 31 can drive the valve core 32 to move relative to the valve port 331 and adjust the opening degree of the valve port. In this embodiment, the valve port 331 is provided on the valve seat 33, but as another embodiment, the valve port may be directly provided on the valve body, and the valve seat may be omitted.

Referring to fig. 2 and 6, the stator housing 11 includes an upper housing 111 and a lower housing 112, the lower housing 112 and the upper housing 111 are at least partially in contact with each other to achieve conductive connection, and the lower housing 112 and the upper housing 111 are fixedly connected by injection molding. The upper housing 111 has a first position-limiting portion 111a and a second position-limiting portion 111b, and in this embodiment, the first position-limiting portion 111a and the second position-limiting portion 111b are located on the upper surface of the upper housing 111 and are both disposed in a protruding manner. Of course, as another embodiment, the first and second position limiting portions may be located on the side wall of the stator housing or on the end surface of the lower housing. The conductive connection in the technical scheme is that the conductive connection between the two is conductive and can be integrated or fixedly connected and the like.

Referring to fig. 1, 2, 4-6, the electric valve further includes a grounding member 5, and the grounding member 5 and the stator housing 11 are made of a metal conductive material and have conductivity. One end of the grounding piece 5 is fixedly connected with the stator shell 11 and can be electrically connected, and the other end of the grounding piece 5 is contacted with the circuit board 2 and can be electrically connected. The grounding member 5 is specifically a grounding pin in this embodiment, but may be another type of grounding member in other embodiments, such as a metal spring. The grounding member 5 includes a mounting portion 51 and a main body portion 52, the main body portion 52 is fixedly connected to or integrally formed with the mounting portion 51, the main body portion 52 is electrically conductive with the mounting portion 51, and the mounting portion 51 is fixedly connected to the stator housing 11 and electrically conductive with the circuit board 2. The body 52 is a pin body, that is, a pin structure having an angle of approximately 90 ° in fig. 4, the body 52 includes a first body 521, a second body 522, and a connecting portion 523, the connecting portion 523 has an arc shape, the first body 521 and the second body 522 are connected by the connecting portion 523, the first body 521 and the second body 522 are substantially vertically disposed, but the connecting portion 523 may be omitted, the first body 521 and the second body 522 are perpendicular to each other, and the first body 521 and the second body 522 are directly connected. The first main body 521 is connected to the mounting portion 51, and the second main body 522 is inserted into and electrically connected to a predetermined hole on the circuit board 2, so as to electrically connect the grounding member 5 to the reference ground of the circuit board 2. Therefore, the circuit board 2 can be electrically connected with the grounding piece 5 and the stator shell 11 in a conductive manner, when external electromagnetic interference exists, the electromagnetism acting on the surface of the stator shell 11 can be guided to the reference stratum of the circuit board 2 from the grounding piece 5, and then the grounding function can be realized by externally connecting the reference stratum to the grounding end, so that the interference of the external electromagnetism can be reduced.

The mounting portion 51 includes a first mounting portion 511 and a second mounting portion 512. The first mounting portion 511 is fixedly connected to the first stopper portion 111a and is electrically conductive, so that the grounding piece 5 can be stopped relative to the stator housing 11 in the axial direction. The second mounting portion 512 is fixedly connected to the second stopper portion 111b, and can prevent the ground contact 5 from rotating relative to the stator housing 11. Specifically, the first mounting portion 511 and the second mounting portion 512 are through-hole structures formed in the mounting portions in this embodiment, and may be of a recessed structure, where the aperture of the first mounting portion 511 matches the outer diameter of the first limiting portion 111c before being riveted, that is, the aperture of the first mounting portion 511 is equal to or slightly larger than the outer diameter of the first limiting portion 111c before being riveted, so that the first limiting portion 111c before being riveted can be pressed into the first mounting portion 511, and the first limiting portion 111c before being riveted pressed into the first mounting portion 511 still protrudes out of the upper surface of the first mounting portion 511, that is, the height of the first limiting portion 111c before being riveted is larger than the thickness of the mounting portion 51, and then the first limiting portion 111c is riveted to fixedly connect the ground piece and the stator housing. The aperture of the second mounting portion 512 is also matched with the outer diameter of the second limiting portion 111b, that is, the aperture of the second mounting portion 512 is equal to or slightly larger than the outer diameter of the second limiting portion 111b, so that the second limiting portion 111b can be pressed into the second mounting portion 512, and the ground piece 5 is limited by the combination of the first limiting portion 111a and the second limiting portion 111b to rotate relative to the stator housing, and the height of the second limiting portion may be higher than, equal to or lower than the thickness of the mounting portion. The first limiting part 111a is separately arranged, the positions of the grounding piece 5 and the stator housing 11 are limited in the axial direction, but the grounding piece 5 can still rotate, the second limiting part 111b is combined with the second mounting part of the grounding piece 5 in a matching way, so that the rotation of the grounding piece 5 relative to the stator housing 11 is limited, the positions of the grounding piece 5 and the stator housing 11 are limited by the matching of the first limiting part 111a and the second limiting part 111b, and further, the main body part 52 in the grounding piece 5 can be aligned to a preset hole position inserted into the circuit board 2, and the main body part 52 and the circuit board 2 are welded and fixed or pressed after being inserted.

Referring to fig. 4, 5 and 6, the upper surface of the first body 521 of the ground element is coplanar with the upper surface of the mounting portion 51, the lower surface of the first body 521 of the ground element is coplanar with the lower surface of the mounting portion 51, and the center line of the first body 521 extends past the center of the first mounting portion 511. The second limiting part 111b is located on the outer side of the first limiting part 111a, and relative to the center of the stator shell, the first limiting part 111a and the second limiting part 111b are arranged circumferentially, so that the circular space of the stator shell can be utilized, and the distance between the first limiting part 111a and the second limiting part 111b is not too large in consideration of production cost. In this embodiment, the distance between the axis of the first limiting portion 111a and the axis of the stator housing 11 is substantially equal to the distance between the axis of the second limiting portion 111b and the axis of the stator housing 11, which is convenient for processing and assembling the limiting portions, the first limiting portion 111a is a main limiting portion, the second limiting portion 111b is an auxiliary limiting portion, the diameter of the first limiting portion 111c before riveting is larger than that of the second limiting portion 111b, and the diameter of the first mounting portion 511 is larger than that of the second limiting portion 111 b. As shown in fig. 5 and 6, the stator housing 11 and the grounding member 5 before and after being riveted are structurally schematic diagrams, the first limiting portion 111a after being riveted has a flange, and the grounding member 5 is limited between the upper surface of the upper housing 111 and the lower surface of the flange.

It is understood that the second mounting portion 512 may be a recess instead of a through hole structure, and the second position-limiting portion 111b is correspondingly configured to have a size and shape matching the recess, but of course, the second mounting portion 512 may also be a protrusion, and the second position-limiting portion is a recess or a through hole matching the protrusion. In addition, the second installation portion and the second limiting portion can also be fixedly connected through riveting or threads, so that the grounding piece and the stator shell are more stable to fix, and only the processing cost is increased.

Referring to fig. 1, the stator assembly 1 further includes an injection molding part 13, the injection molding part 13 is formed by injection molding of the stator housing 11, the winding 12, the grounding member 5, and the like as an injection molding insert, and the injection molding part 13 has a first cavity 131 and a second cavity 132, in this embodiment, the first cavity 131 is not communicated with the second cavity 132, the circuit board 2 is located in the first cavity 131, and the rotor assembly 31 is located in the second cavity 132. A cover plate 14 is further disposed above the injection molding part 13 and seals the first cavity 131 by a sealing ring to prevent external moisture, impurities and the like from entering and affecting the circuit board 2. The second cavity 132 is located in the middle of the stator assembly 1 and the valve components are located at least partially within the second cavity 132.

Referring to fig. 1 and 7, the valve member 3 further includes a sleeve 34, a connecting member 35, a nut 36, and a screw 37. Sleeve 34 is positioned within second cavity 132 and a portion of sleeve 34 is positioned between rotor assembly 31 and stator assembly 1 for isolation. The rotor assembly 31 includes a magnetic rotor 311 and a connection plate 312. The magnetic rotor 311 is fixedly connected to the connecting plate 312, one end of the lead screw 37 is fixedly connected to the connecting plate 312, the lead screw 37 is fixedly connected to the rotor assembly 31 through the connecting plate 312, specifically, the lead screw 37 and the connecting plate 312 can be fixed by welding, and the rotor assembly 31 can be integrally formed, for example, the magnetic rotor 311 is directly injection-molded on the connecting plate 312. The nut 36 has a first mounting hole 361 and a third cavity 362, the first mounting hole 361 is communicated with the third cavity 362, and a part of the side wall forming the first mounting hole 361 has an internal thread section. The other end of the screw 37 extends into the third cavity 362 through the first mounting hole 361 and is connected with the valve core 32, and the outer peripheral wall of the screw 37 is provided with an external thread section matched with the internal thread section. In this embodiment, the nut 36 is fixedly connected to the connecting member 35, the valve seat 33 is located in the valve body 4, and the valve element 32 is at least partially located in the valve seat 33. Further, the electric valve further includes a compression nut 38, the connecting member 35 has a flange portion 351, the flange portion 351 abuts against the valve body 4, the compression nut 38 is fitted to the outer periphery of the main body side wall of the connecting member 35 in the radial direction, the compression nut 38 contacts the upper surface of the flange portion 351, and the compression nut 38 is screwed to the valve body 4, so that the connecting member 35 is fixedly connected to the valve body 4. The electric valve also comprises a pressure plate 6, the stator assembly 1 is fixedly connected with the valve body 4 through the pressure plate 6, the cross section of the pressure plate 6 is approximately L-shaped, one part of the pressure plate 6 is fixedly connected with the stator assembly 1, and the other part of the pressure plate 6 can be fixedly connected with the valve body 4 through adopting screws and other modes. When the stator assembly 1 generates an excitation magnetic field, the rotor assembly 31 drives the screw rod 37 to rotate together under the action of the excitation magnetic field, meanwhile, the screw rod 37 is in threaded fit with the nut 36, the valve core 32 can be driven to move axially, the valve core 32 changes the flow cross section area of the working medium at the valve port 331 by approaching and departing from the valve port, and then throttling and/or on-off of the working medium can be formed at the valve port.

The present technical solution further provides a second embodiment of an electric valve, referring to fig. 8, fig. 8 is a schematic diagram of a partially enlarged structure of the second embodiment of the electric valve, and the embodiment is mainly different from the previous embodiment in that: in this embodiment, the first mounting portion 511 of the grounding member 5 and the first stopper portion 111a of the stator housing upper case 111 are fixedly connected by the screw 7. Specifically, the first position-limiting portion 111a is a through hole or a recessed portion structure recessed from the upper surface of the upper housing 111, the inner wall of the first position-limiting portion 111a has internal threads, and the second position-limiting portion structure is the same as the previous embodiment. The structure of the ground contact 5 is substantially the same as that of the above embodiment, but the inner wall of the first mounting portion 511 has a female screw similar to that of the first stopper portion 111 a. The grounding piece 5 is pressed into the second limiting part and aligned with the first limiting part 111a and the first mounting part 511, and then the grounding piece 5 and the stator shell are fixedly connected through the screw 7. Because stator casing, ground connection 5, screw 7 all adopt the conductive metal material to make, ground connection 5 passes through screw conductive connection with the stator casing like this, and ground connection is connected with the reference bottom layer of circuit board, and when there is external electromagnetic interference, the electromagnetism that acts on stator casing surface can be followed ground connection 5 and guided to the reference ground layer of circuit board 2, is favorable to reducing external electromagnetic interference. Of course, the screw 7 may also be a self-tapping screw, the inner wall of the first limiting portion does not need to be provided with an internal thread, the first limiting portion 111a is a through hole formed in the upper housing 111, the diameter of the through hole is smaller than the outer diameter of the screw 7, the screw 7 is in threaded connection with the first limiting portion, so that the grounding member 5 and the stator housing are in conductive connection through the screw, and when external electromagnetic interference exists, the electromagnetism on the surface of the stator housing can be transmitted to the grounding member 5 from the screw. Of course, the first stopper 111a may be a recess formed in the upper case 111 instead of the through hole, the diameter of the recess may be smaller than the outer diameter of the screw 7, and the screw 7 may be screwed to the first stopper.

Referring to fig. 9, a third embodiment of an electrically operated valve, which differs from the first embodiment mainly in that: the ground member 5 is connected to a side wall of the upper case 111. The structure of the grounding member 5 is the same as that of the first embodiment, and in this embodiment, the sidewall of the upper housing 111 has a first position-limiting portion and a second position-limiting portion. In this embodiment, the first limiting portion and the second limiting portion are located on the side wall of the upper housing, but the first limiting portion and the second limiting portion may also be located on the side wall of the lower housing or the first limiting portion may be located on the side wall of the upper housing, and the second limiting portion is located on the side wall of the lower housing.

The present invention further provides a fourth embodiment of an electric valve, referring to fig. 10, fig. 10 is a schematic structural diagram of the fourth embodiment of the electric valve before the grounding piece 5 and the upper housing 111 of the stator housing are combined, and the embodiment mainly differs from the first embodiment in that: the first position-limiting part 111a of the upper housing 111 is a concave part or a through hole formed on the upper housing 111, the second position-limiting part 111b of the upper housing 111 is a concave part or a through hole formed on the upper housing 111, accordingly, the first mounting part 511 of the grounding member 5 is a protrusion matching with the first position-limiting part 111a, and the second mounting part 512 is a protrusion matching with the second position-limiting part 111 b; the first limiting part 111a is tightly matched and connected with the first mounting part 511 in the axial direction to realize the fixed connection and the conductive connection of the grounding piece and the stator shell, and then the first limiting part 111a and the second mounting part 512 are clamped and combined to enable the grounding piece 5 to rotate and limit relative to the stator shell. The relative stator housing of ground connection 5 rotation spacing indicates that ground connection 5 is spacing among this technical scheme, and ground connection 5 can't rotate relative stator housing.

The present invention also provides a fifth embodiment of an electric valve, referring to fig. 11, fig. 11 is a schematic structural diagram of a fifth embodiment of an electric valve before the grounding piece 5 and the upper housing 111 of the stator housing are combined, and the embodiment is mainly different from the fourth embodiment in that: the second position-limiting portion 111b of the upper housing 111 is a protrusion formed on the upper housing 111, the second mounting portion of the grounding member 5 is a recess or a through hole matched with the second position-limiting portion 111b, and the second position-limiting portion 111b is engaged with the second mounting portion 512.

In the above embodiments, the grounding member is connected to the stator housing and electrically connected to the stator housing by riveting, screwing, or fitting, and may be fixed by an adhesive while ensuring the strength. Since the stator case is generally a galvanized steel sheet, welding may be used to generate toxic gas, and welding may be used in case the plating layer can be protected and in case the generated gas can be treated technically.

It should be noted that: the above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions and modifications thereof without departing from the spirit and scope of the present invention can be modified or replaced by other technical solutions and modifications by those skilled in the art.

Claims (12)

1. An electrically operated valve comprising a circuit board, a stator assembly, said stator assembly comprising a stator housing and windings, said windings being electrically connected to said circuit board, characterized in that: the electric valve is provided with a first limiting part and a second limiting part, the first limiting part and the second limiting part are positioned in the stator shell, the electric valve further comprises a grounding part, the grounding part comprises an installation part and a main body part, the installation part is in conductive connection with the main body part, the installation part comprises a first installation part and a second installation part, the first installation part is connected with the first limiting part, and the fixed connection and the conductive connection between the grounding part and the stator shell can be realized in the axial direction; the second installation part is matched with the second limiting part, the first installation part is connected and combined with the first limiting part to enable the grounding part to rotate and limit the stator shell, and the main body part is in conductive connection with the reference stratum of the circuit board.

2. An electrically operated valve as claimed in claim 1, wherein: first spacing portion with first installation department is through riveting or screw thread or tight fit connection, second spacing portion with second installation department joint or clearance fit connection.

3. An electrically operated valve as claimed in claim 2, wherein: first spacing portion for form in stator housing's bulge, first installation department for form in the through-hole of installation department, the bulge height of first spacing portion is greater than the thickness of installation department, first spacing portion is impressed but through riveting fixed connection and electrically conductive in the first installation department.

4. An electrically operated valve as claimed in claim 2, wherein: first spacing portion for form in stator housing's depressed part or through-hole, the inner wall of first spacing portion has the internal thread, first installation department is for forming the through-hole of installation department, the inner wall of first installation department also has the internal thread, first installation department with first spacing portion passes through screw fixed connection and accessible the screw is electrically conductive.

5. An electrically operated valve as claimed in claim 2, wherein: first spacing portion for form in stator housing's depressed part or through-hole, first installation department is for forming the through-hole of installation department, first installation department with first spacing portion passes through screw fixed connection and accessible the screw is electrically conductive.

6. An electrically operated valve as claimed in claim 2, wherein: the first limiting part is a protruding part formed on the stator shell, the first mounting part is a through hole formed on the mounting part, and the first mounting part is tightly matched and connected with the first limiting part and can conduct electricity;

or, first spacing portion for form in stator housing's depressed part or through-hole, first installation department is for forming the bellying of installation department, first installation department with but first spacing portion close-fitting is connected and electrically conductive.

7. An electrically operated valve as claimed in any one of claims 1 to 6 wherein: the spacing portion of second for take shape with stator housing's bellying/depressed part, the second installation department for form in ground connection spare with spacing portion complex depressed part/bellying of second, the second installation department with spacing portion joint of second.

8. An electrically operated valve as claimed in any one of claims 1 to 6 wherein: the main body part of the grounding piece comprises a first main body part and a second main body part, the first main body part and the second main body part are vertically arranged, the second main body part and the preset hole position of the circuit board are oppositely inserted and fixed, and the stator shell is in conductive connection with the reference stratum of the circuit board through the grounding piece.

9. An electrically operated valve as claimed in claim 7, wherein: the main body part of the grounding piece comprises a first main body part and a second main body part, the first main body part and the second main body part are vertically arranged, the second main body part and the preset hole position of the circuit board are oppositely inserted and fixed, and the stator shell is in conductive connection with the reference stratum of the circuit board through the grounding piece.

10. An electrically operated valve as claimed in claim 8, wherein: the stator shell comprises an upper shell and a lower shell, the upper shell is fixedly connected with the lower shell and is in conductive connection with the lower shell, a first limiting portion and a second limiting portion are located on the upper shell or the end face of the lower shell, and the first limiting portion and the second limiting portion are arranged along the circumferential direction of the stator shell.

11. An electrically operated valve as claimed in claim 9, wherein: the stator shell comprises an upper shell and a lower shell, the upper shell is fixedly connected with the lower shell and is in conductive connection with the lower shell, a first limiting portion and a second limiting portion are located on the upper shell or the end face of the lower shell, and the first limiting portion and the second limiting portion are arranged along the circumferential direction of the stator shell.

12. An electrically operated valve according to claim 10 or 11, wherein: the first limiting portion and the second limiting portion are located on the side face of the stator shell, at least one of the first limiting portion and the second limiting portion is located on the side wall of the upper shell or the side wall of the lower shell, and the first limiting portion and the second limiting portion are arranged along the axial direction or the radial direction of the stator shell.

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