CN115218563A

CN115218563A - Electronic expansion valve

Info

Publication number: CN115218563A
Application number: CN202110405849.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2022-10-21

Abstract

When the sealing part of the valve port seat is abutted against the first valve port part, a refrigerant flows into the buffer part through the second overflowing hole part and flows out of the first overflowing hole part, and the flowing noise of the refrigerant can be relatively improved.

Description

Electronic expansion valve

Technical Field

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

Background

Electronic expansion valve is widely applied to in order to adjust the flow of refrigerant among the refrigerating system, can include the valve body in the electronic expansion valve structure of two-stage structure, the valve body is equipped with big valve port portion, still include the case, the case can be close to or keep away from the valve port portion and adjust in order to realize the large-traffic of refrigerant, the case still is equipped with little valve port portion, electronic expansion valve still includes the valve rod, the valve rod can be close to or keep away from little valve port portion and adjust in order to realize the little flow of refrigerant, it is the technological problem who awaits the opportune moment to improve the flow noise of refrigerant to technical staff in the field.

Disclosure of Invention

The invention aims to provide an electronic expansion valve which can relatively improve the flowing noise of a refrigerant.

The application provides an electronic expansion valve, including valve body, valve port seat, sleeve part, core part and nut part, electronic expansion valve still includes first valve port portion, first valve port portion with valve body fixed connection or structure as an organic whole, the core part includes lead screw and case, the lead screw with nut part screw-thread fit, the sleeve part includes the sleeve body, the valve port seat is equipped with second valve port portion and buffer portion, the case can be close to or keep away from second valve port portion, valve port seat still includes basal portion and extension, follows electronic expansion valve's axial, the extension certainly the basal portion is protruding downwards, the sleeve body with basal portion fixed connection, valve port seat can be close to or keep away from first valve port portion, the lateral wall of extension is equipped with first pore portion, buffer portion is located the below of the entrance point of first overflow pore portion, second valve port portion with the diapire of buffer portion sets up relatively, the sleeve body is equipped with the second overflow pore portion, valve port seat still includes the sealing portion, the sealing portion can with first valve port portion offsets.

When the electronic expansion valve is in a low-flow state, the sealing part is abutted against the first valve port part, and a refrigerant enters from the space of the second overflowing hole part, flows into the buffer part through the second valve port part and flows out through the space of the first overflowing hole part.

The valve port seat structure is additionally arranged through the optimization of the structure of the electronic expansion valve, when the electronic expansion valve is in a low-flow state, the sealing part is abutted against the first valve port part, a refrigerant enters from the space of the second overflow hole part, flows into the buffer part through the second valve port part and flows out through the space of the first overflow hole part,

the flow noise of the refrigerant can be relatively improved.

Drawings

Fig. 1 is a sectional view of the overall structure of a first embodiment of an electronic expansion valve provided in the present application;

FIG. 2 is an enlarged cross-sectional view of the valve seat structure of the electronic expansion valve of FIG. 1;

fig. 3 is a schematic cross-sectional view of another configuration of a guide portion and a core member of the electronic expansion valve provided herein;

fig. 4 is a schematic cross-sectional view of another configuration of a sleeve portion and a core member of an electronic expansion valve provided herein;

fig. 5 is a sectional view of the second embodiment of the electronic expansion valve according to the present application;

FIG. 6 is an enlarged cross-sectional schematic view of the valve port seat structure of FIG. 5;

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description is made with reference to the accompanying drawings and the detailed description.

The present application provides an electronic expansion valve, refer to fig. 1-2 and show a first embodiment of the electronic expansion valve provided by the present application, including a valve body 10, a first connecting pipe 20, a second connecting pipe 30, a connecting seat 40 and a housing 50, the first connecting pipe 20 and the valve body 10 are welded and fixed at a side wall connecting port of the valve body 10, the valve body 10 includes a lower connecting port 11, the second connecting pipe 30 and the valve body 10 are welded and fixed at a lower connecting port, the connecting seat 40 is fixedly connected with an upper end step of the valve body 10, the housing 50 is fixedly connected with the connecting seat 40, the housing 50 is indirectly fixedly connected with the valve body 10 through the connecting seat 40, or a structure of the connecting seat 40 can be cancelled in another valve body structure, the valve body 10 and the connecting seat 40 are integrally formed to realize direct fixed connection with the housing 50.

The sleeve component 100 comprises a sleeve body 101, a third overflowing hole part 1010 is arranged on the side wall of the sleeve body 101, the third through-flow hole 1010 may substantially circumferentially penetrate through a sidewall of the sleeve body 101, a sleeve bottom wall portion of the sleeve body 101 is connected to the sealing member 700 in a limited manner, for example, the flexible sealing member 700 may be mounted on the sleeve bottom wall portion by flexible deformation and extrusion, the sleeve member 100 further includes a limiting portion 102, the limiting portion 102 is connected to an upper end portion of the sleeve body 101, in this embodiment, the limiting portion is a bushing 102, the electronic expansion valve further includes an accommodating cavity D and a stopper portion, the sleeve body 101, the limiting portion and the stopper portion substantially define the accommodating cavity, the lead screw 91 extends into the accommodating cavity D through an opening of the bushing, in this embodiment, the stopper portion is a bushing 103, the bushing 103 is connected to the lead screw 91, the bushing 103 is disposed opposite to the bushing 102, the bushing 103 can approach or be away from the bushing 102, the first elastic member 200 and the second elastic member 300 are located in the accommodating cavity, the first elastic member 200 is closer to the bushing 103 than the second elastic member 300, the upper end of the first elastic element 200 abuts against the shaft sleeve 103, the lower end of the first elastic element 200 abuts against the upper end face of the flange 921 of the valve core 92 directly or indirectly, the upper end of the second elastic element 300 abuts against the lower end face of the flange 921 directly or indirectly, the lower end of the second elastic element 300 abuts against the bottom wall of the sleeve body 101, the valve core 92 is integrally supported on the second elastic element 300, the elastic force of the first elastic element 200 is greater than that of the second elastic element 300, and the valve core 92 can extend out through the lower opening of the sleeve body 101;

the electronic expansion valve further comprises a guide part 70, the guide part 70 is arranged separately from the valve body 10 and is welded and fixed, part of the guide part 70 can be press-fitted into the valve body 10, part of the guide part 70 can be press-fitted into the threaded part 80, so that the guide part 70 is fixed, the guide part 70 comprises a guide inner wall, the sleeve part 100 comprises a sleeve body 101, the guide inner wall is in sliding guide fit with the sleeve body 101, the guide part 70 comprises a first guide outer wall part 72 and a second guide outer wall part 73, the first guide outer wall part 72 is in guide fit with the valve body 10, the second guide outer wall part 73 is in guide fit with the nut part 80, and the coaxiality of the nut part, the guide part, the sleeve part and the valve body part can be relatively guaranteed through the arrangement, and the actuation reliability can be relatively improved.

The guide portion 70 may be formed integrally with the valve body 10 by machining, and when the guide portion 70 and the valve body 10 are integrally formed, the inner peripheral wall of the valve body 10 provides a guiding cooperation function to the sleeve body 101.

Describing the structure of the valve port seat 60 provided by the present application in detail, the valve port seat 60 includes a base 60a and an extension 60b, the valve port seat 60 can be integrally formed by lathing, and then fixed by welding the base 60a to the valve body to achieve the fixed connection between the valve port seat and the valve body, or the valve port seat and the valve body can be integrally formed by lathing, and the like, in the axial direction of the electronic expansion valve, the extension 60b protrudes downward relative to the base 60a, at least a portion of the extension 60a is located in the inner cavity of the adapter 30, the valve port seat 60 is provided with a valve port cavity 63 and further includes a valve port 65, the valve core 92 can approach or separate from the valve port 65, the base 60a extends in a substantially radial direction, the base 60a is arranged perpendicular to the axial direction of the electronic expansion valve, the extension 60b extends in a substantially axial direction of the electronic expansion valve, the extension 60b of the valve port seat 60 is provided with a first through-flow hole portion 61, the valve port seat cavity 63 is communicated with the inner cavity of the second connecting pipe 30 through the space of the first flow passage hole part 61, the first flow passage hole part 61 can substantially penetrate through the side wall of the extending part 60b along the circumferential direction, the first flow passage hole part 61 can also be an inclined hole, the base part 60a is provided with a second flow passage hole part 62, the second flow passage hole part substantially penetrates through the upper surface and the lower surface of the base part 60a along the axial direction, the valve cavity C of the electronic expansion valve is communicated with the inner cavity of the second connecting pipe 30 through the space of the second flow passage hole part, the second flow passage hole part 62 is arranged along the circumferential direction of the base part around the valve port part 65, the lower part of the valve port seat 60 is further provided with a buffer part a, the bottom wall 64 of the valve port seat 60 and the inner peripheral wall of the partial valve port seat 60 below the inlet end of the first flow passage hole part 61 are substantially limited to form a buffer part a, the buffer part a partial valve port seat cavity 63 is formed by the buffer part a, and the valve port part 65 is arranged opposite to the bottom wall 64.

When the electronic expansion valve performs small flow adjustment, the rotor component 500 is rotated by excitation to drive the lead screw 91 to rotate, the lead screw integrally moves downwards together with the rotor component 500 through the thread matching effect with the nut component 80, the sleeve portion 100 also moves downwards axially, the guide inner wall of the guide portion 70 is in sliding guide fit with the outer peripheral wall of the sleeve body 101 until the sealing member 700 abuts against the opening portion of the second overflow hole portion 62, at this time, the bushing 102 can abut against the shaft sleeve 103, the lead screw 91 continues to move downwards by excitation, the shaft sleeve 103 also moves downwards along with the axial direction of the lead screw 91, the shaft sleeve 103 gradually moves away from the bushing 102, the shaft sleeve 103 moves downwards along with the rotation of the lead screw 91 to apply pressure on the first elastic element 200, the first elastic element 200 is pressed on the flange portion 921 of the valve core 92, the valve core 92 is pressed to move downwards to overcome the elastic force of the second elastic part 300, the valve core 92 gradually approaches the valve port 65 until the valve core abuts against the valve port 65, the rotor part 500 rotates reversely, the lead screw 91 moves axially upwards, the shaft sleeve 103 approaches the bushing 103, the first elastic part 200 is pressed to be reduced, the second elastic part 300 returns to support the valve core 92 to lift upwards, the valve core 92 can approach or separate from the valve port 65 to adjust the small flow rate of the refrigerant, the refrigerant flows into the valve cavity C of the electronic expansion valve from the first connecting pipe 20 and then enters the accommodating cavity D through the space of the third overflowing hole part 1010 of the sleeve body 101, the refrigerant sequentially enters the valve port cavity 63 through the lower opening of the sleeve body 101 and the valve port seat 65 and sinks to the buffer part a, and the refrigerant after being buffered by the buffer part a flows into the inner cavity of the second connecting pipe 30 through the space of the first overflowing hole part 61.

Through the setting, the refrigerant need subside earlier in buffer A when little flow control, flow through first overflow hole portion 61 again, the velocity of flow can greatly reduced, the flow noise of refrigerant has been reduced relatively, make the base of valve port seat 60 and valve body carry out fixed connection or be the integrated into one piece structure through the structure of addding valve port seat 60, the relative base of extension is protruding downwards, valve port seat 60 is equipped with buffer A, it need not additionally to add the amortization piece in the electronic expansion valve structure of design of making an uproar to compare traditional needs, and only need carry out optimal design to electronic expansion valve's spare part structure and just can realize better noise cancelling effect.

When the electronic expansion valve needs to perform large-flow adjustment, the rotor component performs reverse rotation movement along with the increase of the excitation effect, the shaft sleeve 103 abuts against the bushing 102, the lead screw continues to move axially upward to drive the sleeve portion 100 to lift axially upward, the soft sealing member 700 gradually leaves away from the opening of the second flow passage hole portion 62, a part of the refrigerant enters the valve cavity C of the electronic expansion valve from the first connecting pipe 20, enters the valve port seat cavity 63 through the valve port portion 65, then sinks to the retention space a for buffering, and then flows out through the space of the first flow passage hole portion 61, and the other part of the refrigerant flows into the second connecting pipe 30 through the space of the second flow passage hole portion 62.

In order to better satisfy the requirement of adjusting the large flow rate of the refrigerant, the drift diameter of the second overflowing hole portion 62 may be increased appropriately according to the specification of the system or the electronic expansion valve, or the number of the second overflowing holes 62 may be adjusted to satisfy the adjustment of the large flow rate.

Through the optimized arrangement of the structure, in the process of adjusting the flow rate of the refrigerant in the two-section electronic expansion valve, the sleeve part 100 abuts against the opening part of the second flow passage hole part 62 of the valve port seat 60 through the sealing part 700 so as to realize small flow rate adjustment of the refrigerant and relatively improve the flow noise of the refrigerant under small flow rate adjustment; the sealing member 700 of the sleeve portion 100 is relatively far away from the opening portion of the second flow passage hole portion 62 to achieve large-flow adjustment of the refrigerant and relatively improve the flow noise of the refrigerant under the large-flow adjustment, the refrigerant can be settled through the buffer portion a, the flow velocity of the refrigerant can be relatively reduced after the refrigerant is buffered, and then the refrigerant flows out from the space of the first flow passage hole portion 61, so that the flow noise of the refrigerant can be improved, and the purpose of reducing the noise can be achieved without adopting a traditional noise reduction structure, namely by additionally arranging a plurality of noise reduction parts on the valve cavity or the connecting pipe.

When the electronic expansion valve is in high-flow adjustment, the refrigerant flows from the space of the second overflow hole portion 62 to the second connection pipe 30 through the flow guide channel B1, a part of the outer peripheral wall of the extension portion and a part of the inner peripheral wall of the valve body 10 substantially define the flow guide channel B1, and the flow guide channel B1 is inclined from the lower opening portion of the second overflow hole portion 62 toward the second connection pipe 30.

As shown in fig. 3, for an example of other structures of the guide portion and the core component of the electronic expansion valve provided by the present application, a part of the nut component 80' is press-fitted into the valve body, the inner peripheral wall of the nut component 80' forms the guide portion to provide a guiding effect to the sleeve body, the outer peripheral wall of the sleeve body is slidably guided and matched with the inner peripheral wall of the nut component 80', the core component 90' may be an integrally formed structure, and includes a lead screw 91' and a valve core 92', the lead screw 91' and the valve core 92' are an integral structure, the first elastic member 200' abuts between the nut component 80' and the limiting portion 102, and the second elastic member 300' abuts between the shaft sleeve 10 and the bottom wall of the sleeve body, which can also achieve the technical effects of the present application, and the specific structures and the matching connection relationships of the components of the electronic expansion valve, and the actuation principles of the components during large and small flow rate adjustment have been described in detail above, and will not be repeated.

As shown in fig. 4, for an example of other structures of the sleeve component and the core component of the electronic expansion valve provided by the present application, the core component 90a may be an integrally formed structure, and includes a flange portion 103', the flange portion 103' may substantially protrude outward from the body of the core component 90a in a substantially radial direction, and the sleeve portion may also be an integrally formed structure, and includes a limiting portion 102', the flange portion 103' may be close to or away from the limiting portion 102', and when the electronic expansion valve performs large flow adjustment, the flange portion 103' and the limiting portion 102' directly or indirectly abut against each other to drive the sleeve portion to be lifted upward as a whole to be away from the opening portion of the second flow passage hole portion.

It should be noted that the term "directly" and "indirectly" as used herein includes direct and indirect communication, and the term "communicating" includes direct and indirect communication, and in various embodiments, other configurations of the components such as the guide portion, the core member, and the sleeve portion may be replaced with those illustrated in the present application, and the technical effects provided by the present application may be achieved.

Referring to fig. 5-6, a second embodiment of the electronic expansion valve provided by the present application is described, which is different from the first embodiment in that in the present embodiment, a sleeve member 100 'is fixedly connected to a valve seat 60', the electronic expansion valve may be provided with a first valve port portion 11', in the present embodiment, a valve body 10' may be provided with the first valve port portion 11 'by integral forming, or the first valve port portion 11' may be provided separately from the valve body 10 'and then welded, the valve seat 60' includes a base portion 60a 'and an extension portion 60b', the extension portion 60b 'protrudes downward relative to the base portion 60a' in an axial direction of the electronic expansion valve, a sidewall of the extension portion 60b 'penetrates through a first flow passing hole portion 61', the first flow passing portion 61 'may substantially penetrate a sidewall of the extension portion in a circumferential direction, or the first flow passing valve port portion may be provided as an oblique hole, the valve seat 60' is further provided with a buffer portion a, the relief portion a is located below the inlet end 61a 'of the first flow passage hole portion 61', the bottom wall 64 'of the valve seat 60', the inner peripheral wall 66 'of the partially extended portion located below the inlet end 61a' substantially define the relief portion a, the valve seat 60 'includes a second valve port portion 65', and a valve seat cavity 63 'is further provided, the bottom wall 64' is disposed opposite to the second valve port portion 65', a space of the relief portion a forms the partially valve seat cavity 63', the valve seat 60 'occupies a space of the partially valve cavity C', the extended portion 60b 'of the valve seat 60' can approach or be spaced apart from the first valve port portion 11', the valve seat 60' includes a sealing portion 67', when the sealing portion 67' abuts against the first valve port portion 11', the partially extended portion 60b' is within the first valve port portion 11', the partially extended portion 60b' is located within the inner cavity of the second connection pipe 30, the sleeve member 100 'includes a sleeve body 101', the sleeve body 101 'is provided with a second flow passage hole portion 1010', the second overflowing hole portion 1010 'penetrates through the sleeve body 101', the sleeve body 101 'is fixedly connected with the base portion 60a', the electronic expansion valve can be implemented by laser welding, spot welding or bonding, and the like, and is further provided with an accommodating cavity D ', in this embodiment, the valve port seat 60', the sleeve body 101', and the limiting portion 102' substantially define the accommodating cavity D ', the valve spool of the core body component 90 can approach or be far away from the second valve port portion 65', the electronic expansion valve includes a large flow adjusting state and a small flow adjusting state, when the electronic expansion valve is in the large flow state, the valve port seat 60 'is axially lifted upwards, the extending portion 60b' is relatively far away from the first valve port portion 11', and the refrigerant enters the valve cavity from the first connecting pipe 20 and then flows into the inner cavity of the second connecting pipe 30 through the second valve port portion 11'; when the electronic expansion valve is in a low flow rate adjustment state, the sealing portion 67' of the valve seat 60' abuts against the first valve port 11', the refrigerant enters the valve chamber C from the first connecting pipe 20, enters the accommodating chamber D through the second flow passage hole portion 1010', sinks into the buffer portion a ' through the second valve port portion 65' to be buffered, the flow rate of the refrigerant is relatively reduced, and flows to the inner cavity of the second connecting pipe through the space of the first flow passage hole portion, a sealing member 700' may be further added to the electronic expansion valve for achieving a better sealing effect, the sealing member 700' may be in limited connection with the valve seat 60', and the sealing member 700' abuts against the first valve port 11' or the sealing member 700' abuts against the end surface where the first valve port 11' is located.

The electronic expansion valve is further provided with an elastic member 300 and a flange part, wherein the flange part is fixedly connected or in limited connection with the core body part or is in an integral structure, the flange part protrudes outwards from the body of the core body part in the radial direction, one end of the elastic member 300 is abutted against the lower end face of the flange part, and the other end of the elastic member is abutted against the base part 60 a'.

It should be noted that other components of the second embodiment of the electronic expansion valve provided by the present application, for example, components such as the limiting portion, the stopper portion, and the core member, may be replaced with the structures shown in fig. 3 and 4, and in addition, in the present embodiment, the sleeve body 101' is slidably fitted to the inner peripheral wall of the valve body 10', the guide portion and the valve body may be separately provided, and then welded and fixed, instead of the guide portion structure of the first embodiment, or the sleeve member 100' may be provided with a guiding function using a nut member as shown in fig. 3.

Herein, the terms of orientation, upper, lower, left and right, are defined with reference to the drawings shown in the drawings of the specification, are only for the sake of understanding and convenience of description, and should not limit the scope of protection of the present application, and the "first" and "second" stated in the present application are also interpreted as above.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An electronic expansion valve is characterized by comprising a valve body, a valve port seat, a sleeve part, a core part and a nut part, wherein the electronic expansion valve further comprises a first valve port part, the first valve port part is fixedly connected with the valve body or is of an integrated structure, the core part comprises a screw rod and a valve core, the screw rod is in threaded fit with the nut part, the valve port seat is provided with a second valve port part and a buffer part, the valve core can approach or be far away from the second valve port part, the valve port seat further comprises a base part and an extension part, the extension part protrudes downwards from the base part along the axial direction of the electronic expansion valve, the sleeve part is fixedly connected with the base part, the valve port seat can approach or be far away from the first valve port part, the side wall of the extension part is provided with a first overflowing hole part, the buffer part is positioned below the inlet end of the first overflowing hole part, the bottom wall of the second valve port part and the buffer part are oppositely arranged, the sleeve body is provided with a second overflowing hole part, the valve port seat further comprises a sealing part, and the sealing part can abut against the first valve port part.

When the electronic expansion valve is in a low-flow state, the sealing part abuts against the first valve opening part, and a refrigerant enters from the space of the second overflow hole part, flows into the buffer part through the second valve opening part and flows out through the space of the first overflow hole part.

2. The electronic expansion valve according to claim 1, wherein the sleeve member further comprises a sleeve body and a limiting portion, the sidewall of the sleeve body is provided with the second flow passage hole portion, the limiting portion protrudes from the sleeve body substantially in a radial direction, the limiting portion is fixedly connected with the sleeve body or is an integrally formed structure, the electronic expansion valve further comprises a stopping portion, the stopping portion is fixedly connected with the core member or is an integrally formed structure, and the stopping portion can abut against the limiting portion.

3. The electronic expansion valve according to claim 1, further comprising a sealing member, wherein the sealing member is connected to the valve port seat in a limiting manner, and the sealing member can abut against the first valve port or the sealing member can abut against an end surface of the first valve port.

4. The electronic expansion valve according to claim 1, further comprising a guide portion fixedly connected to the valve body or integrally formed with the valve body, or wherein the nut member is provided with the guide portion slidably guided to engage with the outer peripheral wall of the sleeve member.

5. An electronic expansion valve according to claim 4, wherein the guide portion is formed integrally with the valve body, and an inner peripheral wall of the valve body is slidably guided in engagement with an outer peripheral wall of the sleeve member.

6. An electronic expansion valve according to claim 4, wherein a portion of the nut member is press-fit and guided in engagement with the valve body, an inner peripheral wall of the nut member is slidably guided in engagement with an outer peripheral wall of the sleeve member, and the core member is of an integrally formed construction.

7. The electronic expansion valve according to claim 4, wherein the guide portion is separate from the valve body, the guide portion includes a first guide outer wall portion and a second guide outer wall portion, the first guide outer wall portion is fitted to the valve body, the second guide outer wall portion is fitted to the inner wall of the nut member, the inner wall of the guide portion is slidably fitted to the sleeve body, the limiting portion is a bushing, the bushing is fixedly connected to the sleeve body, the stopper portion is a bushing, the core member is an integral structure, the bushing is connected to the core member, and the bushing can abut against each other.

8. The electronic expansion valve according to any one of claims 1 to 7, further comprising an elastic member, wherein the core member is provided with a flange portion that protrudes radially outward from the body of the core member, one end of the elastic member abuts against a lower end surface of the flange portion, and the other end of the elastic member abuts against the base portion.