CN107542948B - Electric valve - Google Patents

Abstract

An electric valve comprises a valve body, a valve core assembly and a rotating shaft, wherein the valve body is provided with a cavity, the valve core assembly comprises a valve seat and a valve block, the valve seat and the valve body are fixedly arranged, the valve seat is arranged at the bottom of the cavity or close to the bottom of the cavity, the valve seat is provided with a first through hole, a second through hole and a third through hole, the valve body comprises a first circulation channel, a second circulation channel, a third circulation channel and a fourth circulation channel which penetrate through the valve wall of the valve body, one end of the first circulation channel, one end of the second circulation channel and one end of the third circulation channel are positioned at the bottom of the cavity, and the first circulation channel, the second circulation channel and the third circulation channel are respectively communicated with the first through hole, the second through hole and; the valve block is limited on the rotating shaft, the valve block moves relative to the valve seat when the rotating shaft rotates, and a groove is formed in one surface, opposite to the valve seat, of the valve block; the electric valve comprises at least a first operation mode and a second operation mode. The electric valve with the structure can change the flow path of the refrigerant, has light weight and small occupied volume, and can effectively reduce the cost.

Description

Electric valve

Technical Field

The invention belongs to the technical field of valves, and relates to a flow path control valve applied to a refrigerant loop (such as an air conditioning system for a vehicle) on an automobile.

Background

In the refrigeration cycle apparatus, an electric valve is generally used as a control means for changing a refrigerant flow path. The electric valve generally uses a driving device to drive a rotating shaft to move, and the rotating shaft drives a valve block to slide on a valve seat to change which outlet is communicated with an inlet. However, in the conventional electric valve, only the inlet can be selectively communicated with a plurality of outlets in a switching way, and the outlet which is not communicated with the inlet is cut off.

Therefore, the prior art does not effectively utilize the stopped outlet, so that the application range of the existing electric valve is limited, and different electric valves need to be developed for different systems or modes, or the electric valve needs to be matched with other valve parts to meet the requirement.

Therefore, there is a need for improvement of the prior art to solve the above technical problems.

Disclosure of Invention

The invention aims to provide an electric valve which comprises a plurality of modes, has a wide application range and has a relatively simple structure.

The technical scheme provided by the invention comprises an electric valve, which comprises a valve body, a valve core assembly and a rotating shaft, wherein the valve body is provided with a cavity, the valve core assembly comprises a valve seat and a valve block, the valve seat and the valve body are fixedly arranged, the valve seat is arranged at the bottom of the cavity or close to the bottom of the cavity, the valve seat is provided with a first through hole, a second through hole and a third through hole, the valve body comprises a first circulation channel, a second circulation channel, a third circulation channel and a fourth circulation channel, the first circulation channel, the second circulation channel and the third circulation channel penetrate through the valve wall of the valve body, one end of the first circulation channel, one end of the second circulation channel and one end of the third circulation channel are positioned at the bottom of the cavity, the first circulation channel, the second circulation channel and the third circulation channel are respectively communicated with the first through hole, the second through hole and the third through hole, and the;

the valve block is limited on the rotating shaft, can rotate along with the rotating shaft, moves relative to the valve seat when the rotating shaft rotates, is attached to the valve seat on one surface facing the valve seat, and is provided with a groove on one surface opposite to the valve seat;

the electric valve comprises at least a first and a second mode of operation,

when the electric valve is in a first working mode, the valve block covers the second through hole and the third through hole, the fourth through channel is communicated with the first through hole, and the second through hole is communicated with the third through hole through the groove;

when the electric valve is in a second working mode, the valve block covers the first through hole and the third through hole, the fourth circulation channel is communicated with the second through hole, and the first through hole is communicated with the third through hole through the groove.

The valve block comprises a base body and a flange part protruding from the outer periphery of the base body in the radial direction, the groove is formed in the base body, the flange part is further provided with a key groove, the rotating shaft is matched with the key groove, and the valve block is driven to move through the key groove when the rotating shaft rotates; the electric valve further comprises a driving device, one end of the rotating shaft is in transmission arrangement with the driving device, and the rotating shaft is driven by the driving device.

The farthest distance between the third through hole and the center of the valve seat is less than or equal to the farthest distance between the first through hole and the center of the valve seat, the closest distance between the third through hole and the center of the valve seat is greater than or equal to the closest distance between the first through hole and the center of the valve seat, the distance between the third through hole and the first through hole is less than the distance between the second through hole and the first through hole, and the distance between the third through hole and the second through hole is less than the distance between the second through hole and the first through hole; the valve seat is also provided with at least two fixing holes, and in the first working mode or the second working mode, the groove does not cover the fixing holes or completely covers one hole when viewed from the top.

At least the part of the valve block, which is opposite to the valve seat, is made of ceramic materials, at least the part of the valve seat, which is opposite to the valve block, is made of ceramic materials, and a sealing element is arranged between the valve seat and the bottom of the cavity and isolates the first through hole, the second through hole and the third through hole from each other.

In the first working mode, when viewed from the top, the groove and the second through hole are overlapped to form a first overlapped part and are partially communicated, the groove and the third through hole are overlapped to form a second overlapped part and are partially communicated, and the second through hole is communicated with the third through hole through the first overlapped part, the groove and the second overlapped part;

when the second working mode is used, viewed from the top, the groove and the first through hole are partially overlapped to form a third overlapped part, the groove and the third through hole are partially overlapped to form a fourth overlapped part, and the first through hole is communicated with the third through hole through the third overlapped part, the groove and the fourth overlapped part.

The cavity is provided with an opening end, the cavity is provided with a step-shaped structure and comprises a first cavity, a second cavity and a third cavity, the fourth circulation channel is communicated with the first cavity, a first step part relatively close to the opening end and a second step part relatively close to the bottom of the cavity are formed on the inner wall of the cavity, the first step part is positioned between the first cavity and the second cavity, the second step part is positioned between the second cavity and the third cavity, the second step part is of a roughly semicircular structure, and a first blocking part and a second blocking part which limit the action stroke of the valve block are formed on one part of the inner wall of the second cavity of the valve body;

the valve block further comprises a limiting part and a flange part, wherein the limiting part and the flange part are arranged in a protruding mode from the outer periphery of the base body in the radial direction, the flange part is close to the center of the valve body relative to the limiting part, and the limiting part is far away from the flange part relative to the base body; when the limiting part comprises a first end and a second end in the first mode, the first end of the limiting part is abutted against the first blocking part or is relatively close to the first blocking part.

The thickness d of the base body, the depth d2 of the second cavity and the thickness d1 of the limiting part meet the following requirements: d > d2 > d 1; the maximum distance between the edge of the limiting part and the center of the flange part is smaller than the maximum distance between the inner wall of the second cavity and the center of the flange part, and the maximum distance between the edge of the base body and the center of the flange part is smaller than the maximum distance between the inner wall of the third cavity and the center of the flange part.

The valve body is internally provided with a support piece, the support piece and the first step part are fixedly installed, the support piece comprises a plate body which is approximately in a fan shape when viewed from the top, concave parts are arranged on two sides of the plate body, a distance is kept between the concave parts and the inner wall of the first cavity, a space structure between the concave parts and the inner wall of the first cavity is communicated with the second cavity, the plate body comprises a first shaft hole, the rotating shaft penetrates through the first shaft hole and can be rotatably arranged relative to the support piece, and the first shaft hole limits the radial movement of the rotating shaft.

The side, close to the support, of the valve block is also provided with at least one limiting hole, the limiting hole is a blind hole, the electric valve is provided with an elastic element and a ball body in the limiting hole, at least part of the ball body is positioned in the limiting hole, the ball body is positioned between the valve block and the support and is abutted against the support, one end of the spring is abutted against the bottom of the positioning hole, the other end of the spring is abutted against the ball body, and the spring is in a compressed state;

or the support part is provided with an elastic element at one side close to the valve block, one side of the elastic element is abutted against the support part, the other side of the elastic element is abutted against the valve block, and the elastic element is positioned between the support part and the valve block.

A port of the first flow channel and a port of the second flow channel are located on a third side opposite the bottom of the chamber, a port of the third flow channel and a port of the fourth flow channel are located on a second side and a first side, respectively, opposite the sidewall of the chamber, and the third flow channel includes a substantially vertically extending straight channel and a substantially transversely extending transverse channel;

the flow areas of the first through hole and the second through hole are larger than the flow area of the third through hole, and the inner diameter of a port of the third flow channel in the valve body is smaller than that of a port on the second side surface;

the first circulation channel, the second circulation channel, the third circulation channel and the fourth circulation channel all comprise a step-shaped structure; and at least one of the first side surface, the second side surface and the third side surface of the valve body is provided with a screw hole.

The electric valve further comprises a third mode of operation and a fourth mode of operation,

when the electric valve is in a third working mode, the second end of the limiting part is abutted against the second blocking part or the second end of the limiting part is relatively close to the second blocking part, the valve block does not cover the second through hole and the third through hole, the valve block does not completely cover the first through hole, and the fourth circulation channel is respectively communicated with the first through hole, the second through hole and the third through hole;

when the electric valve is in a fourth working mode, the valve block covers the third through hole, the valve block partially covers the first through hole or does not cover the first through hole, the valve block partially covers the second through hole or does not cover the second through hole, the first through hole, the second through hole and the fourth circulation channel are not communicated with the third through hole, and the fourth circulation channel is respectively communicated with the first through hole and the second through hole.

The electric valve with the structure can not only be communicated with the other port through the selective port, but also be communicated with other ports, comprises a plurality of modes, and has wide application range and simple structure.

Drawings

Figure 1 is a schematic cross-sectional view of one embodiment of an electrically operated valve of the present invention;

figure 2 is a schematic cross-sectional view of the electrically operated valve shown in figure 1 at the location of the first and second flow channels;

figure 3 is a schematic perspective view of the valve body of the electric valve of figure 1;

FIG. 4 is a cross-sectional schematic view of the valve body of FIG. 3;

figure 5 is a schematic view of the structure of the support of the electric valve of figure 1;

figure 6 is a schematic perspective view of the valve body of the electrically operated valve of figure 1;

FIG. 7 is a top schematic view of the valve body of FIG. 6;

figure 8 is a schematic view of the valve seat of the electrically operated valve of figure 1;

figure 9 is a schematic view of the valve block of the electrically operated valve of figure 1;

FIG. 10 is a schematic view of the valve block of FIG. 9 in an inverted configuration;

FIG. 11 is a cross-sectional view taken along line A-A of FIG. 9;

figure 12 is a schematic cross-sectional view of the rotary shaft of the electrically operated valve of figure 1;

figure 13 is a schematic view of the valve block and seat position of the electrically operated valve of figure 1 in a first mode of operation;

figure 14 is a schematic view of the valve block and seat position relationship of the electrically operated valve of figure 1 in a second mode of operation;

figure 15 is a schematic view of the valve block and seat position relationship of the electrically operated valve of figure 1 in a third mode of operation;

figure 16 is a schematic view of the valve block and seat position relationship of the electrically operated valve of figure 1 in a fourth operating mode;

wherein the dashed lines are illustrated as invisible parts.

Detailed Description

The following describes a specific embodiment of the present invention with reference to the drawings.

The embodiment discloses an electrically operated valve which can be applied to a refrigeration circuit of an automobile air conditioning system and the like. Referring to fig. 1 to fig. 3, the electric valve 100 includes a valve body 1, a rotating shaft 2, a valve core assembly and a driving device 3. Wherein the valve body 1 has a chamber 101 and the spool assembly is disposed within the chamber 101. The chamber 101 has an open structure at one end, and the valve body 1 may be made of a metal material, such as aluminum material.

The valve body 1 includes a valve body 1011 having an opening structure and a cover plate 1012 fixed to the valve body 1011, the cover plate 1012 is provided at an opening end of the valve body 1, and a mounting hole 1012' is provided at a central position, the valve body 1011 and the cover plate 1012 may be assembled and fixed by caulking, screws, or the like, and the cover plate 1012 may be made of a metal material.

In order to improve the sealing performance of the valve body 1 and prevent the refrigerant from leaking from the chamber 101, a seal ring may be provided between the end 1011a of the valve body 1011 contacting the cover 1012 and the end 1012a of the cover 1012 contacting the valve body 1011.

The valve body 1 and the driving device 3 are fixedly arranged, such as connected and fixed through a connecting device or fixed through screws and the like. One end of the rotating shaft 2 is driven by a power mechanism of the driving device 3, the other end of the rotating shaft passes through the mounting hole 1012' on the cover plate 1012 to be connected with the valve core assembly, the driving device 3 can drive the rotating shaft 2 to move, the movement of the rotating shaft 2 can drive the valve core assembly to move, and therefore the driving device 3 can drive the valve core assembly to move through the rotating shaft 2 to change the position of the valve core assembly, and therefore conversion of different working modes of the electric valve is achieved.

The valve body 1 may be a rectangular parallelepiped including a first side surface 010 (a right side surface in the illustrated embodiment), a second side surface 020 (a front surface in the illustrated embodiment) adjacent to the first side surface 010, a third side surface 030 (a lower side surface in the illustrated embodiment) perpendicular to the first and second side surfaces 010 and 020, and a fourth side surface 040 (an upper side surface in the illustrated embodiment), and an open end of the valve body 1 may be located on the fourth side surface 040.

The valve body 1 includes a fourth flow channel 11 penetrating through the valve wall and having one end port located on the first side 010, a first flow channel 12 and a second flow channel 13 penetrating through the valve wall and having one end port located on the third side 030, and a third flow channel 14 penetrating through the valve wall and having one end port located on the second side 020, the fourth flow channel 11 is communicated with the cavity 101, and a refrigerant can be introduced through the fourth flow channel 11, and in this embodiment, the fourth flow channel 11 serves as a refrigerant introduction channel. In this embodiment, the arrangement of the first flow channel 12, the second flow channel 13, the third flow channel 14 and the fourth flow channel 11 is reasonable, so that interference between the flow channels is avoided, and the installation of the electric valve and the installation of the external pipeline are facilitated.

As shown in fig. 4, the third flow channel 14 in this embodiment is a bent communication channel, and the third flow channel 14 includes a straight channel 141 extending substantially vertically, and a transverse channel 142 extending substantially transversely, the straight channel 141 and the transverse channel 142 being communicated, where the transverse and vertical directions are illustrated in the orientation of the drawing; therefore, one end of the third circulation channel 14 is located at the second side surface, the other end of the third circulation channel is located at the bottom of the cavity 101, all the circulation channels are reasonably arranged, the processing is simple, a connecting pipe does not need to be arranged at one end port of the circulation channel located in the valve body, and the connecting pipe needs to be arranged at one end port of the second side surface, and the arrangement mode can enable the inner diameter of the transverse channel 142 to be larger than that of the straight channel 141. In the embodiment, the first circulation channel 12, the second circulation channel 13, the third circulation channel 14 and the fourth circulation channel 11 all comprise stepped holes for being in pressure joint with an external pipeline; and at least one of the first side 010, the second side 020 and the third side 030 may further be provided with a screw hole for fixing with an external system, thereby realizing stable and reliable connection of the electric valve in the system.

The chamber 101 has a stepped structure, the chamber 101 includes a first chamber 1013, a second chamber 1014, and a third chamber 1015, the fourth flow channel 11 communicates with the first chamber 1013, an inner wall of the chamber 101 is formed with a first step 101a relatively close to an open end and a second step 101b relatively close to a bottom of the chamber 101, the first step 101a is located between the first chamber 1013 and the second chamber 1014, the second step 101b is located between the second chamber 1014 and the third chamber 1015, and one end of the first flow channel 12, the second flow channel 13, and the third flow channel 14 is located at the bottom of the third chamber 1015.

The valve core assembly comprises a valve seat 5 and a valve block 6, wherein one end of the valve block 6 is limited at one end of the rotating shaft 2, the other end of the valve block 6 is in sliding fit with the valve seat 5, and the sliding fit refers to that the valve block 6 can slidably move or rotate relative to the valve seat 5 under the power action of the rotating shaft. The clearance between the mating portions of the valve block 6 and the valve seat 5 may be relatively small and the inability or internal leakage of refrigerant to flow directly between the mating portions of the valve block 6 and the valve seat 5 may be relatively small. In order to limit the axial displacement of the valve block 6 that may occur during rotation of the shaft 2, so that the plane of the cooperating portion of the valve block 6 substantially coincides with the plane of the cooperating portion of the valve seat 5, a support 4 may also be provided in the chamber, the body of the support 4 being located in the first chamber 1013. Specifically, the support 4 is fixedly mounted on the first step 101a, and the support 4 can be fixed to the valve body 1 by screws. As shown in fig. 5, the support member 4 may have a plate-like structure including a plate body 41 having a substantially fan-like shape, and recesses 42 are formed at both sides, a space structure for circulating the refrigerant is formed between the recesses 42 and the inner wall of the first chamber 1013, and the space structure between the recesses 42 and the inner wall of the first chamber communicates with the second chamber. The plate 41 further includes a first shaft hole 411 through which the rotation shaft 2 can pass and which restricts the rotation shaft 2 from moving radially, and the rotation shaft 2 can pass through the first shaft hole 411 and rotate freely. The support member 4 further includes screw mounting holes 412 for fixing the support member, the number of the screw mounting holes may be set according to actual conditions, as long as the support member 4 can be fixed on the valve body 1011, in this embodiment, there are 5 screw mounting holes, or two or one screw mounting hole plus a positioning hole may be used for fixing. In addition, the support member may have a stepped portion, so that a portion thereof engaged with the valve block 6 is projected in a direction of the valve block, and an elastic member such as a plate spring is provided at the portion to abut against the valve block 6, or a structure such as a coil spring is used to directly or indirectly abut against the valve block 6, so that the valve block 6 and the valve seat can be substantially attached at the engaged portion.

Referring to fig. 6 and 7, fig. 6 is a schematic perspective view of an electric valve body, and fig. 7 is a top view of fig. 6. As can be seen from fig. 6, the second chamber 1014 and the third chamber 1015 are arranged concentrically, and the first chamber 1013 and the third chamber 1015 are arranged eccentrically, so that on one hand, the contact area between the support member 4 and the first step portion 101a can be increased, thereby improving the stability of the support member, and on the other hand, the space between the concave portion 42 of the support member and the inner wall of the first chamber 1013 for the flow of the refrigerant can be increased, thereby improving the flow velocity of the refrigerant and preventing the increase of the flow resistance of the refrigerant.

In the above structure, the second step portion 101b may be a semicircular ring structure, and a part of the inner wall of the second chamber is formed as the first blocking portion 101b ' and the second blocking portion 101b ", or two ends of the second chamber are formed as the first blocking portion 101b ' and the second blocking portion 101b", and since at least a part of the valve block 6 is located in the second chamber 1014, the first blocking portion 101b ' and the second blocking portion 101b "may respectively limit the movement strokes of the valve block 6 in two directions during the rotation of the valve block 6 along with the rotation axis.

The valve seat 5 is fixedly mounted on the bottom wall of the cavity 101 of the valve body, wherein the material of the valve seat 5 can be ceramic material and is fixed with the valve body part 1011 by screws. The structure of the valve seat 5 is shown in fig. 8, the valve seat 5 includes an annular body 51, the body 51 includes a second shaft hole 52 and at least two screw mounting holes 53, the second shaft hole 52 of the body 51 and the positioning shaft 7 may also be in transition fit, and the positioning shaft 7 and the valve body 1011 may be fixed in interference fit. Screw mounting hole 53 sets up to 3 in this embodiment, compares, and three screw both can fixed disk seat 5, can guarantee ceramic disk seat 5 on a plane again, has avoided when the atress is great or the vibration is great, and ceramic disk seat 5 has produced crackle easily and has influenced refrigerant valve's life. The screw mounting hole 53 is a counter bore, and a screw can be sunk into the screw mounting hole 53, so that the screw can be prevented from influencing the sealing performance between the valve block and the valve seat. The valve seat may be fixed by caulking or the like, and a caulking hole may be provided in the valve seat, not limited to the screw mounting hole.

The body 51 is further provided with a first through hole 511 communicating with the first flow channel 12, a second through hole 512 communicating with the second flow channel 13, and a third through hole 513 communicating with the third flow channel 14. The first through hole 511, the second through hole 512 and the third through hole 513 are all circular holes, the third through hole is located between the first through hole and the second through hole, and the distances from the center of the first through hole 511, the center of the second through hole 512 and the center of the third through hole 513 to the center of the body 51 are the same. The arrangement mode is convenient for processing, and can ensure that the distance between the first through hole 511 and the third through hole 513 is relatively smaller and the distance between the second through hole 512 and the third through hole 513 is relatively smaller on the premise of no interference of the first through hole 511, the second through hole 512 and the third through hole 513, so that the valve block 6 can be relatively reduced, the contact area between the valve block 6 and the valve seat 5 is reduced, the friction force between the valve block 6 and the valve seat 5 is reduced, and the torque requirement on the driving device 3 is reduced. Of course, in actual installation, the first through hole 511, the second through hole 512, and the third through hole 513 may be formed in other shapes such as an oval shape, a square shape, and the like; in addition, various special-shaped structures can be adopted for the flow control requirement.

The flow area of the first and second through holes 511 and 512 is larger than that of the third through hole 513, and in this embodiment, the diameter of the first and second through holes 511 and 512 is larger than that of the third through hole 513. In the system, the third through hole 513 is communicated with the third flow channel 14 and then communicated with the compressor, and the diameter of the third through hole 513 is small, so that the refrigerant can slowly flow back to the compressor, and the demand of slowly recycling the refrigerant can be realized.

The valve seat 5 is fixed to the bottom of the cavity 101 by screws, and in order to prevent the refrigerant from leaking at the contact portion between the valve seat 5 and the cavity 101, at least three sealing rings are further disposed between the valve seat 5 and the bottom of the cavity 101, as shown in fig. 2 (a third flow passage is not shown), at least one sealing ring encloses the first through hole 511, at least another sealing ring encloses the second through hole 512, and at least another sealing ring encloses the third through hole 513. The arrangement mode can effectively reduce internal leakage. Alternatively, a profiled seal may be used to separate the three flow channels from one another.

Referring to fig. 9 to 11, fig. 9 is an axial view of the valve block, fig. 10 is a schematic view of the valve block shown in fig. 9 when it is inverted, fig. 11 is a sectional view of fig. 9 taken along the direction a-a, and the valve block 6 is similar to a sector structure and includes a base 61, and a flange portion 62 and a stopper portion 63 protruding from the outer peripheral side of the base 61 in the radial direction, and the flange portion 62 and the stopper portion 63 are located at opposite positions. The position-limiting portion 63 includes a second end surface 632 relatively close to the second step surface, a first end surface 631 relatively far away from the second step surface, and a first end 633 and a second end 634 at two opposite sides, and when the first end 633 of the position-limiting portion abuts against the first blocking portion 101b', or the second end 634 abuts against the second blocking portion 101b ″, the valve block 6 stops operating. In this embodiment, the limiting portion has an arc-shaped structure, the first end 633 and the second end 634 are connected together, and the limiting portion may also be two limiting end portions respectively disposed, that is, the first end and the second end respectively protrude outward from the base body, and the two end portions may not be connected together.

The upper surfaces of the flange portion 62, the limiting portion 63 and the base body may be in the same plane, the thickness of the flange portion 62 may be the same as the thickness of the base body 61, the thickness d1 of the limiting portion 63 is less than or equal to the thickness d of the base body 61, the depth d2 of the second cavity is smaller than the thickness d of the base body, and the depth d2 of the second cavity is greater than or equal to the thickness d1 of the limiting portion 63. This may allow the depth d2 of the second cavity 1014 to be relatively small, which may facilitate milling of the second cavity 1014, which may reduce processing difficulties. In addition, the lower end surface 632 of the limiting part can not contact with the second step part 101b, and the upper end surface 631 can not contact with the supporting piece 4 mounted on the first step part 101a, so that the friction force in the movement process of the valve block 6 is reduced. The flange portion 62 is further provided with a key groove 622 and a through hole 623 penetrating the bottom of the key groove 622, the rotating shaft 2 is fitted and fixed to the key groove 622, and the lower surface 612 of the base portion 61 is further provided with a single recessed groove 612 a. As shown in fig. 9, the upper surface 611 of the base portion may further include two stopper holes 611 a. It should be noted here that the limiting hole 611a and the groove 612a are both blind holes.

The maximum distance from the edge of the stopper 63 to the center of the through hole 623 is smaller than the maximum distance from the inner wall of the second chamber to the center of the through hole 623, and the maximum distance from the edge of the base 61 to the center of the through hole 623 is smaller than the maximum distance from the inner wall of the third chamber to the center of the through hole 623. Therefore, the valve block is not contacted with the inner wall of the cavity when in action, the abrasion of the valve block is reduced, and the friction can also be reduced.

Referring to fig. 12, fig. 12 is a schematic view of a rotating shaft 2, the rotating shaft 2 includes a substantially cylindrical shaft body 21 and a fitting portion 22 at one end of the rotating shaft 2 connected to a valve block 6, and a positioning recess 24 is provided inward from an end surface 23 of the rotating shaft at the end connected to the valve block 6, a positioning shaft 7 is inserted into the positioning recess 24, and the other end of the positioning shaft 7 passes through a through hole 623 of the valve block 6 and a second shaft hole 52 of a valve seat 5 to be in interference fit with the valve body 1 for fixation; the rotating shaft 2 is pressed in the key groove 622 through the matching part 22 to match with the valve block 6, and when the driving device 3 drives the rotating shaft 2 to move, the rotating shaft 2 can drive the valve block 6 to move relative to the valve seat 5. In this embodiment, the valve block 6 and the valve seat 5 are made of ceramic materials, and compared with other materials, the valve block and the bottom plate made of ceramic materials have small friction force, are not easy to wear, and can relatively reduce internal leakage. And the ceramic valve block 6 can be a fan-shaped structure, so that the contact area with the valve seat 5 is relatively small, the friction force in the sliding process of the ceramic valve block and the valve seat can be reduced, the requirement on the torque is reduced, the size of a driving device can be reduced, and the ceramic valve block is favorable for reducing the cost, the weight of a product and the installation space in a system.

The sliding process of the valve block on the valve seat is further described below, and the operation process of the valve core assembly includes a first operation mode, a second operation mode, a third operation mode and a fourth operation mode. As shown in fig. 13, which is a schematic diagram of the positional relationship between the valve block and the valve seat in the first operation mode of the electric valve, at this time, the valve block 6 abuts against the first blocking portion 101b', the base body 61 of the valve block 6 covers the second through hole 512 and the third through hole 513, and the refrigerant flowing into the chamber 101 from the fourth flow channel 11 passes through the concave portion 42 of the support 4 to communicate with the first through hole 511, and is led out of the electric valve through the first flow channel 12. Since the second through hole 512 and the third through hole 513 are blocked by the valve block 6, neither the second through hole 512 nor the third through hole 513 communicates with the fourth flow channel. In the present specification, the base-covering through hole of the valve block means that the base covers the through hole in the valve seat, and the through hole may be blocked by the valve block when viewed from above.

It can be seen from the figure that the groove 612a at the bottom of the valve block 6 is communicated with the portions of the second through hole 512 and the third through hole 513, and a first overlapping portion 5121 and a second overlapping portion 5131 are formed in the top view, that is, the second through hole 512 is communicated with the groove 612a through the first overlapping portion 5121, and the third through hole 513 is communicated with the groove 612a through the second overlapping portion 5131, so that the second through hole 512 is communicated with the third through hole 513 through the groove 612 a. Thus, the refrigerant may flow into the compressor through the second flow channel 13, the second through hole, the groove 612a, and the third flow channel 14, and may serve to recover a portion of the refrigerant. Meanwhile, the flow area of the channel is relatively small, in the embodiment, the sectional areas of the first overlapping portion 5121 and the second overlapping portion 5131 are small, so that impact on the valve block 6 caused by instantaneous inflow of a large amount of refrigerants is avoided, the sealing performance of the valve block 6 and the valve seat 5 is affected, and the refrigerants can slowly flow from the second flow channel to the third flow channel through the groove. At this time, the groove 612a is not communicated with the screw mounting hole 53, or the groove 612a completely covers the screw mounting hole 53, so that the refrigerant can be prevented from flowing into the groove 612a through the gap between the screw mounting hole 53 and the valve block 6, and the inner leakage can be reduced.

When the driving device 3 drives the rotating shaft 2 to move, the rotating shaft 2 drives the valve block 6 to move to the position shown in fig. 14, which is a schematic diagram of the position relationship between the valve block and the valve seat in the second operation mode of the electric valve. As shown in the figure, the base body 61 of the valve block 6 covers the first through hole 511 and the third through hole 513, the refrigerant flowing into the chamber 101 from the fourth flow channel 11 passes through the space between the support member 4 and the inner wall of the chamber to communicate with the second through hole 512, and is led out of the electric valve through the second flow channel 13, and neither the first through hole 511 nor the third through hole 513 communicates with the fourth flow channel because the first through hole 511 nor the third through hole 513 is blocked by the valve block 6.

As can be seen from the figure, a third overlapping portion 5113 and a fourth overlapping portion 5134, through which a refrigerant can flow, are formed in the bottom of the valve block 6 in such a manner that the groove 612a overlaps the first through hole 511 and the third through hole 513, the first through hole 511 communicates with the groove 612a through the third overlapping portion 5113, the third through hole 513 communicates with the groove 612a through the fourth overlapping portion 5134, and the first through hole 511 communicates with the third through hole 513 through the groove 612 a. Thus, the refrigerant communicated through the first through hole 511 may flow into the compressor through the first circulation passage 12, the first through hole, the groove 612a, the third through hole of the first through hole, and the third circulation passage 14, thereby performing a function of recovering a portion of the refrigerant. In this operation mode, the overlapping portion 5113 of the first through hole and the overlapping portion 5134 of the third through hole have smaller cross-sectional areas, and the function is the same as that of the first operation mode, which will not be described herein again.

Fig. 15 is a schematic diagram illustrating a positional relationship between the valve block and the valve seat in a third operation mode of the electric valve, in which the valve block 6 abuts against the second blocking portion 101b ″ and the base body 61 of the valve block 6 does not cover the first through hole 511, the second through hole 512, and the third through hole 513; thus, the refrigerant flowing into the chamber 101 from the fourth flow channel 11 passes through a space between the supporter 4 and the inner wall of the chamber, a portion of the refrigerant is communicated with the first through hole 511, a portion of the refrigerant is communicated with the second through hole 512, and a portion of the refrigerant is communicated with the third through hole 513. Or the second end of the limiting part is relatively close to but not abutted against the second blocking part, the valve block does not cover the second through hole and the third through hole, and the valve block does not completely cover the first through hole, namely the valve block covers part of the first through hole.

As shown in fig. 16, in a fourth operation mode of the electric valve, the base 61 of the valve block 6 covers the third through hole 513, the base 61 of the valve block 6 partially covers the first through hole 511 and the second through hole 512, or the base 61 of the valve block 6 does not cover the first through hole 511 and the second through hole 512, at this time, the groove 612a at the bottom of the valve block completely covers the third through hole 513, the fourth flow channel 11 is not communicated with the third through hole 513, and the third flow channel 14 is closed; accordingly, the fourth flow path 11 communicates with the first through hole 511 and the first through part 5112 and the second through part 5122 in which the second through hole 512 is not covered, and the refrigerant flowing into the chamber 101 from the fourth flow path 11 flows to the first flow path 12 and the second flow path 13 through the first through part 5112 and the second through part 5122 in which the first through hole 511 and the second through hole 512 are not covered, respectively.

In addition, the working condition of the automobile is complex in the running process, and vibration can inevitably occur, so that the phenomena that the valve block 6 and the valve seat 5 cannot be sealed and the like due to vibration of the electric valve are caused. In this embodiment, the position-limiting structure 8 may be disposed in a position-limiting hole 611a on the valve block 6, as shown in fig. 1, the position-limiting structure 8 includes a spring 81 and a ball 82, the spring 81 is disposed in the position-limiting hole 611a or other counter bore, the ball 82 is located between the valve block 6 and the support 4, the ball 82 abuts against the spring 81, and the spring 81 is in a compressed state. Therefore, a certain spring force is generated between the supporting piece and the valve block, and the valve block 6 is limited to move axially in the process of moving along with the rotating shaft 2, so that the function of stabilizing the valve block 6 is achieved, and the valve block 6 is ensured to be always attached to the valve seat 5; and rolling friction is generated between the ball 82 and the support 4, and the friction force is small.

In the above-described embodiment, the electro-valve includes four operation modes, and when the electro-valve is specifically used, any two or more operation modes can be selected according to the system requirements, for example, the first operation mode and the second operation mode, and if only two operation modes are selected, the position requirements of three through holes can be reduced; in the existing arrangement mode, the valve block of the electric valve can be located at different positions to work, so that the electric valve can be suitable for different systems to meet different requirements.

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 electric valve comprises a valve body, a valve core assembly and a rotating shaft, wherein the valve body is provided with a cavity, the valve core assembly comprises a valve seat and a valve block, the valve seat is fixedly arranged with the valve body, the valve seat is arranged at the bottom of the cavity or close to the bottom of the cavity, the valve seat is provided with a first through hole, a second through hole and a third through hole, the valve body comprises a first circulation channel, a second circulation channel, a third circulation channel and a fourth circulation channel which penetrate through the valve wall of the valve body, one end of the first circulation channel, one end of the second circulation channel and one end of the third circulation channel are arranged at the bottom of the cavity, the first circulation channel, the second circulation channel and the third circulation channel are respectively communicated with the first through hole, the second through hole and the third through hole, and the fourth circulation channel is communicated with the cavity; the farthest distance between the third through hole and the center of the valve seat is less than or equal to the farthest distance between the first through hole and the center of the valve seat, the closest distance between the third through hole and the center of the valve seat is greater than or equal to the closest distance between the first through hole and the center of the valve seat, the distance between the third through hole and the first through hole is less than the distance between the second through hole and the first through hole, and the distance between the third through hole and the second through hole is less than the distance between the second through hole and the first through hole;

the valve block is limited on the rotating shaft, can rotate along with the rotating shaft, moves relative to the valve seat when the rotating shaft rotates, is attached to the valve seat on one surface facing the valve seat, and is provided with a groove on one surface opposite to the valve seat;

the electric valve comprises at least a first and a second mode of operation,

when the electric valve is in a first working mode, the valve block covers the second through hole and the third through hole, the fourth through channel is communicated with the first through hole, and the second through hole is communicated with the third through hole through the groove;

when the electric valve is in a second working mode, the valve block covers the first through hole and the third through hole, the fourth circulation channel is communicated with the second through hole, and the first through hole is communicated with the third through hole through the groove.

2. The electric valve according to claim 1, wherein the valve block comprises a base body, and a flange portion protruding from an outer peripheral side of the base body in a radial direction, the groove is provided in the base body, the flange portion is further provided with a key groove, the rotating shaft is provided in cooperation with the key groove, and the rotating shaft drives the valve block to move through the key groove when rotating; the electric valve further comprises a driving device, one end of the rotating shaft is in transmission arrangement with the driving device, and the rotating shaft is driven by the driving device.

3. The electrically operated valve according to claim 2, wherein the valve seat is further provided with at least two fixing holes, and in the first operation mode or the second operation mode, the recess does not cover the fixing holes or the recess completely covers one hole as viewed in a plan view.

4. The electrically operated valve according to claim 3, wherein at least a portion of said valve block opposite to said valve seat is made of a ceramic material, at least a portion of said valve seat opposite to said valve block is made of a ceramic material, and a sealing member is further provided between said valve seat and a bottom of the chamber, the sealing member isolating said first through hole, said second through hole and said third through hole from each other.

5. The electrically operated valve according to claim 4, wherein, in the first operation mode, the groove and the second through hole portion overlap to form a first overlapping portion and partially communicate with each other, the groove and the third through hole portion overlap to form a second overlapping portion and partially communicate with each other, and the second through hole communicates with the third through hole through the first overlapping portion, the groove, and the second overlapping portion;

when the second working mode is used, viewed from the top, the groove and the first through hole are partially overlapped to form a third overlapped part, the groove and the third through hole are partially overlapped to form a fourth overlapped part, and the first through hole is communicated with the third through hole through the third overlapped part, the groove and the fourth overlapped part.

6. The electric valve according to any one of claims 2 to 5, wherein the cavity has an open end, the cavity has a stepped structure, the cavity comprises a first cavity, a second cavity and a third cavity, the fourth flow channel communicates with the first cavity, the inner wall of the cavity is formed with a first step portion relatively close to the open end and a second step portion relatively close to the bottom of the cavity, the first step portion is located between the first cavity and the second cavity, the second step portion is located between the second cavity and the third cavity, the second step portion has a substantially semicircular ring structure, and the valve body is formed with a first stopper and a second stopper on a part of the inner wall of the second cavity for limiting the action stroke of the valve block;

the valve block further comprises a limiting part and a flange part, wherein the limiting part and the flange part are arranged in a protruding mode from the outer periphery of the base body in the radial direction, the flange part is close to the center of the valve body relative to the limiting part, and the limiting part is far away from the flange part relative to the base body; when the limiting part comprises a first end and a second end in the first mode, the first end of the limiting part is abutted against the first blocking part or is relatively close to the first blocking part.

7. The electric valve of claim 6, wherein the base thickness d, the second cavity depth d2 and the limiting portion thickness d1 satisfy: d > d2 > d 1; the maximum distance between the edge of the limiting part and the center of the flange part is smaller than the maximum distance between the inner wall of the second cavity and the center of the flange part, and the maximum distance between the edge of the base body and the center of the flange part is smaller than the maximum distance between the inner wall of the third cavity and the center of the flange part.

8. The electric valve according to claim 7, wherein a support member is further disposed in the valve body, the support member is fixedly mounted to the first step portion, the support member comprises a plate body having a substantially fan-shaped shape when viewed from above, and recesses are formed on both sides of the plate body, the recesses are spaced from an inner wall of the first chamber, and a space structure between the recesses and the inner wall of the first chamber is communicated with the second chamber, the plate body comprises a first shaft hole, the rotating shaft passes through the first shaft hole and is rotatably disposed relative to the support member, and the first shaft hole restricts radial movement of the rotating shaft.

9. Electrically operated valve according to claim 8, characterized in that:

the side, close to the support, of the valve block is also provided with at least one limiting hole, the limiting hole is a blind hole, the electric valve is provided with an elastic element and a ball body in the limiting hole, at least part of the ball body is positioned in the limiting hole, the ball body is positioned between the valve block and the support and is abutted against the support, one end of the elastic element is abutted against the bottom of the limiting hole, the other end of the elastic element is abutted against the ball body, and the elastic element is in a compressed state;

or the support part is provided with an elastic element at one side close to the valve block, one side of the elastic element is abutted against the support part, the other side of the elastic element is abutted against the valve block, and the elastic element is positioned between the support part and the valve block.

10. The electrically actuated valve of claim 9 wherein a port of said first flow channel and a port of said second flow channel are located on a third side opposite said bottom of said chamber, a port of said third flow channel and a port of said fourth flow channel are located on a second side and a first side opposite said side walls of said chamber, respectively, said third flow channel comprising a substantially vertically extending straight channel and a substantially laterally extending transverse channel;

the flow areas of the first through hole and the second through hole are larger than the flow area of the third through hole, and the inner diameter of a port of the third flow channel in the valve body is smaller than that of a port on the second side surface;

the first circulation channel, the second circulation channel, the third circulation channel and the fourth circulation channel all comprise a step-shaped structure; and at least one of the first side surface, the second side surface and the third side surface of the valve body is provided with a screw hole.

11. The electrically operated valve of claim 6, further comprising a third mode of operation and a fourth mode of operation,

when the electric valve is in a third working mode, the second end of the limiting part is abutted against the second blocking part or the second end of the limiting part is relatively close to the second blocking part, the valve block does not cover the second through hole and the third through hole, the valve block does not completely cover the first through hole, and the fourth circulation channel is respectively communicated with the first through hole, the second through hole and the third through hole;

when the electric valve is in a fourth working mode, the valve block covers the third through hole, the valve block partially covers the first through hole or does not cover the first through hole, the valve block partially covers the second through hole or does not cover the second through hole, the first through hole, the second through hole and the fourth circulation channel are not communicated with the third through hole, and the fourth circulation channel is respectively communicated with the first through hole and the second through hole.

12. Electrically operated valve according to any of claims 7 to 10, characterized in that the electrically operated valve further comprises a third mode of operation and a fourth mode of operation,

when the electric valve is in a third working mode, the second end of the limiting part is abutted against the second blocking part or the second end of the limiting part is relatively close to the second blocking part, the valve block does not cover the second through hole and the third through hole, the valve block does not completely cover the first through hole, and the fourth circulation channel is respectively communicated with the first through hole, the second through hole and the third through hole;

when the electric valve is in a fourth working mode, the valve block covers the third through hole, the valve block partially covers the first through hole or does not cover the first through hole, the valve block partially covers the second through hole or does not cover the second through hole, the first through hole, the second through hole and the fourth circulation channel are not communicated with the third through hole, and the fourth circulation channel is respectively communicated with the first through hole and the second through hole.

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