CN216158325U

CN216158325U - Electronic expansion valve

Info

Publication number: CN216158325U
Application number: CN202122116124.4U
Authority: CN
Inventors: 张克鹏; 贺宇辰
Original assignee: ZHUHAI HUAYU METAL CO LTD
Current assignee: ZHUHAI HUAYU METAL CO LTD
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-04-01
Anticipated expiration: 2031-09-02

Abstract

The utility model provides an electronic expansion valve, comprising: a valve body having a receiving cavity; the nut sleeve is fixedly arranged in the valve body and provided with a first cavity and an opening which are communicated, and the opening is positioned at the bottom of the nut sleeve; the screw rod is movably arranged in the valve body, penetrates through the nut sleeve and is in threaded connection; the guide sleeve is arranged on the valve body, part of the guide sleeve is positioned in the first cavity, and the guide sleeve and the first cavity are communicated; the valve core assembly comprises a spring sleeve and a valve needle, the spring sleeve and the valve needle are arranged in the guide sleeve, a first end, opposite to the spring sleeve, of the spring sleeve is connected with the screw, the valve needle penetrates through a second end of the spring sleeve, the spring sleeve is provided with a second cavity, and part of the valve needle is located in the second cavity; a first gap is formed between the inner wall of the guide sleeve and the outer wall of the spring sleeve and is communicated with a first through hole formed in the side wall of the spring sleeve, and the cross sectional area of the first gap is 80% -120% of that of the first through hole. Through the technical scheme that this application provided, solve among the prior art inside atmospheric pressure of valve body can not quick balance, the problem of part pressurized differential force.

Description

Electronic expansion valve

Technical Field

The utility model relates to the field of electronic expansion valves, in particular to an electronic expansion valve.

Background

At present, an existing electronic expansion valve generally comprises a valve body, a nut sleeve, a screw rod, a valve core assembly and a guide sleeve. The valve body is provided with a valve port, a nut sleeve, a screw rod, a valve core assembly and a guide sleeve, wherein the nut sleeve, the screw rod, the valve core assembly and the guide sleeve are arranged inside the valve body, the screw rod penetrates through the nut sleeve, the guide sleeve is positioned inside the nut sleeve, the valve core assembly is positioned inside the guide sleeve, and the valve port is controlled to be switched on or switched off through the valve core assembly.

In the prior art, because pressure difference exists between partial components, the electronic expansion valve can act only by overcoming the pressure difference in the motion process, so that the reaction speed of the electronic expansion valve is low, and internal parts are easily damaged under the influence of long-term periodic pressure difference force, and the normal work of the valve body is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic expansion valve, which aims to solve the problems that a valve body in the prior art is low in response speed and parts are easy to damage.

The utility model provides an electronic expansion valve, which comprises: a valve body having a receiving cavity; the nut sleeve is fixedly arranged in the valve body, a first cavity and an opening are formed in the nut sleeve, the opening is communicated with the first cavity, and the opening is positioned at the bottom of the nut sleeve; the screw rod is movably arranged in the valve body, penetrates through the nut sleeve and is in threaded connection with the nut sleeve; the guide sleeve is arranged in the valve body, part of the guide sleeve is positioned in the first cavity, and the guide sleeve is communicated with the first cavity; the valve core assembly is arranged in the guide sleeve, the screw is in driving connection with the valve core assembly so that the valve core assembly can move in the guide sleeve, the valve core assembly comprises a spring sleeve and a valve needle, the spring sleeve is provided with a first end and a second end which are oppositely arranged, the first end of the spring sleeve is connected with the screw, the valve needle penetrates through the second end of the spring sleeve, the spring sleeve is provided with a second cavity, and part of the valve needle is positioned in the second cavity; wherein, have first clearance between the outer wall of the inner wall of uide bushing and spring housing, be provided with first through-hole on the spring housing lateral wall, first through-hole and first clearance intercommunication to make the inside of second cavity and uide bushing be linked together, the cross sectional area of first clearance is 80% to 120% of the cross sectional area of first through-hole.

By applying the technical scheme of the utility model, the electronic expansion valve comprises a valve body, a nut sleeve, a screw, a guide sleeve and a valve core assembly. Wherein, be provided with first clearance between uide bushing and the spring housing, be provided with first through-hole on the lateral wall of spring housing to switch on first through-hole and first clearance, so can make inside and the spring housing of uide bushing inside be linked together, reduced the pressure differential between the two. When the valve core assembly moves relative to the guide sleeve, the influence on the valve core assembly caused by pressure difference can be reduced, so that the valve core assembly can smoothly move in the guide sleeve, and the overall reaction speed of the device can be further improved; and, because the pressure differential of uide bushing and case subassembly reduces or eliminates, consequently can prolong both's life.

Further, a second through hole is formed in the side wall of the nut sleeve and communicated with the accommodating cavity and the first cavity. The space of the accommodating cavity and the space of the first cavity are communicated by the second through hole, so that the nut sleeve and the accommodating cavity are communicated with each other, and the pressure difference between the nut sleeve and the accommodating cavity is reduced.

Further, the cross-sectional area of the second through-hole is 80% to 120% of the cross-sectional area of the first through-hole. Therefore, the flow space of the second through hole is equivalent to that of the first through hole, fluid can flow smoothly between the first through hole and the second through hole, and the pressure balance effect of the first through hole and the second through hole can be improved.

Further, the first through hole is a circular hole, and the diameter range of the first through hole is 0.6mm to 1.5 mm. The diameter of the first through hole is smaller than 0.6mm, so that the fluid circulation effect is influenced, and the pressure balance effect of the guide sleeve and the spring sleeve is further influenced; if the diameter of the first through hole is larger than 1.5mm, the protection effect of the spring sleeve on the internal structure can be influenced.

Further, the case subassembly is still including bearing, gasket and the spring that sets up in order, and the bearing includes outer lane and inner circle, screw rod and inner circle fixed connection, the both ends of gasket respectively with the one end butt of outer lane and spring, the other end and the needle of spring are connected. Through setting up the bearing, can make when the relative nut cover of screw rod is rotatory, gasket, spring, needle can not rotate to the stability of gasket, spring, needle has been improved.

Further, a communication channel is arranged among the spring sleeve, the bearing and the screw rod and is used for communicating the first cavity and the second cavity. Through setting up the intercommunication passageway, can increase the flow area between spring housing, uide bushing and the nut cover.

Further, the second through hole is formed in one end, close to the valve core assembly, of the nut sleeve. The second through hole is formed in the position, so that the circulation distance of gas among the guide sleeve, the nut sleeve and the containing cavity can be shortened, and the pressure can be quickly balanced.

Further, the case subassembly still includes and presses the cover, presses the cover to establish in the outside of needle, and presses the cover and spring housing's one end fixed connection who keeps away from the nut cover, presses the cover to include first column section and second column section, and the circumference size of first column section is bigger than the circumference size of second column section, and the spring housing cover is established on the second column section and is connected with the terminal surface looks butt of first column section, and the inner wall of spring housing is laminated with the outside of second column section mutually. The pressure sleeve can limit the moving position of the valve needle in the spring sleeve, and the valve needle can be axially positioned through the pressure sleeve.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic diagram of an electronic expansion valve provided by the present invention;

FIG. 2 shows a partial enlarged view at A in FIG. 1;

FIG. 3 shows a partial enlarged view at B in FIG. 2;

fig. 4 shows a schematic structural view of a nut sleeve provided by the utility model.

Wherein the figures include the following reference numerals:

10. a valve body;

20. a nut sleeve; 21. a first cavity; 22. a second through hole;

30. a screw; 40. a guide sleeve; 41. a first gap;

50. a valve core assembly;

51. a spring housing; 511. a first end; 512. a second end; 513. a second cavity; 514. a first through hole;

52. a valve needle; 53. a bearing; 54. a gasket; 55. a spring;

56. and (5) pressing the sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides an electronic expansion valve, including: the valve comprises a valve body 10, a nut sleeve 20, a screw 30, a guide sleeve 40 and a valve core assembly 50. Wherein the valve body 10 has a receiving cavity. The nut sleeve 20 is fixedly arranged in the valve body 10, the nut sleeve 20 is internally provided with a first cavity 21 and an opening, the opening is communicated with the first cavity 21, and the opening is positioned at the bottom of the nut sleeve 20. The screw rod 30 is movably arranged in the valve body 10, the screw rod 30 penetrates through the nut sleeve 20 and is in threaded connection with the nut sleeve 20, and the screw rod 30 can move up and down in the valve body 10. The guide sleeve 40 is arranged in the valve body 10, the guide sleeve 40 is partially positioned in the first cavity 21, the guide sleeve 40 is communicated with the first cavity 21, and the guide sleeve 40 is matched with the nut sleeve 20 to block the opening. The valve core assembly 50 is arranged in the guide sleeve 40, the screw 30 is in driving connection with the valve core assembly 50, so that the valve core assembly 50 moves up and down in the guide sleeve 40, and the guide sleeve 40 guides the valve core assembly 50. The valve core assembly 50 comprises a spring sleeve 51 and a valve needle 52, the spring sleeve 51 has a first end 511 and a second end 512 which are oppositely arranged, the first end 511 of the spring sleeve 51 is connected with the screw 30, the valve needle 52 is arranged at the second end 512 of the spring sleeve 51 in a penetrating way, the spring sleeve 51 has a second cavity 513, and part of the valve needle 52 is located in the second cavity 513. Wherein, a first gap 41 is arranged between the inner wall of the guide sleeve 40 and the outer wall of the spring sleeve 51, a first through hole 514 is arranged on the side wall of the spring sleeve 51, the first through hole 514 is communicated with the first gap 41, so that the second cavity 513 is communicated with the interior of the guide sleeve 40, and the cross-sectional area of the first gap 41 is 80-120% of the cross-sectional area of the first through hole 514.

According to the technical scheme provided by the application, the electronic expansion valve comprises a valve body 10, a nut sleeve 20, a screw 30, a guide sleeve 40 and a valve core assembly 50. The first gap 41 is formed between the guide sleeve 40 and the spring sleeve 51, the first through hole 514 is formed in the side wall of the spring sleeve 51, and the first through hole 514 is communicated with the first gap 41, so that the interior of the guide sleeve 40 is communicated with the interior of the spring sleeve 51, and the pressure difference between the interior of the guide sleeve 40 and the interior of the spring sleeve 51 is reduced. When the valve core assembly 50 moves relative to the guide sleeve 40, the influence on the valve core assembly 50 caused by pressure difference can be reduced, so that the valve core assembly 50 can smoothly move in the guide sleeve 40, and the overall reaction speed of the device can be further improved; and, because the pressure difference between the guide sleeve 40 and the valve core assembly 50 is reduced or eliminated, the service life of the guide sleeve and the valve core assembly can be prolonged.

The cross-sectional area of the first gap 41 is set to 80% to 120% of the cross-sectional area of the first through hole 514, so that the flow space of the first gap 41 is equivalent to the flow space of the first through hole 514, fluid can smoothly flow between the first gap and the first through hole, and the pressure balance effect of the first gap and the first through hole can be improved. If the difference between the two cross sectional areas is too large, the fluid flow is not facilitated, and the pressure balance effect is influenced.

Wherein, the side wall of the nut sleeve 20 is provided with a second through hole 22, and the second through hole 22 is communicated with the accommodating cavity and the first cavity 21. The space for accommodating the cavity and the first cavity 21 is communicated by arranging the second through hole 22, so that the nut sleeve 20 and the accommodating cavity can be communicated with each other, the pressure difference between the nut sleeve 20 and the accommodating cavity is reduced, and the nut sleeve 20 and the guide sleeve 40 are communicated with each other, so that the spring sleeve 51, the guide sleeve 40, the nut sleeve 20 and the accommodating cavity can be communicated with each other, the pressure difference inside the device is further reduced, the influence on component movement caused by the pressure difference is reduced, the reaction speed of valve body work can be further improved, and the service life of components is prolonged.

Further, the cross-sectional area of the second through-hole 22 is 80% to 120% of the cross-sectional area of the first through-hole 514. Thus, the flow space of the second through hole 22 is equivalent to the flow space of the first through hole 514, and the fluid can smoothly flow between the two, so that the pressure balance effect of the two can be improved. If the difference between the cross sectional areas of the two is too large, the fluid is not easy to move, and the pressure balance effect is influenced. Furthermore, the flow spaces among the second through hole 22, the first through hole 514 and the first gap 41 are equivalent, so that the fluid can smoothly flow in the valve body, and the pressure balance effect is ensured.

The first through hole 514 is a circular hole, and the diameter of the first through hole 514 ranges from 0.6mm to 1.5 mm. The round hole design of the first through hole 514 facilitates the machining of the spring housing 51. The diameter of the first through hole 514 is smaller than 0.6mm, which affects the fluid circulation effect, and further affects the pressure balance effect of the guide sleeve 40 and the spring sleeve 51; if the diameter of the first through hole 514 is larger than 1.5mm, the protection effect of the spring housing 51 on the internal structure is affected. Therefore, in the present application, the diameter of the first through hole 514 is set to range from 0.6mm to 1.5 mm. The pressure balance requirement can be met, and the structural strength and the protection effect of the spring sleeve 51 can be guaranteed. Specifically, the diameter of the first through hole 514 may be 0.6mm, 1mm, or 1.5 mm.

In this application, the valve core assembly 50 further includes a bearing 53, a gasket 54 and a spring 55 which are sequentially arranged, the bearing 53 includes an outer ring and an inner ring, the screw 30 is fixedly connected with the inner ring, the screw 30 drives the inner ring to rotate when rotating, and the screw 30 drives the valve core assembly 50 to move together through the inner ring when moving up and down. The washer 54 has both ends abutting against the outer ring and one end of the spring 55, respectively, the washer 54 has a larger diameter end abutting against the outer ring, the spring housing 51 abuts against the outer ring of the bearing 53, and the spring 55 has the other end connected to the needle 52. By arranging the bearing 53, when the valve needle 52 abuts against the valve port in the valve closing process, the screw rod 30 continues to rotate due to the influence of coil pulse, at the moment, the inner ring of the bearing 53 rotates, the outer ring does not move, and the spring sleeve 51, the gasket 54, the spring 55 and the valve needle 52 cannot rotate, so that the abrasion of the valve needle 52 and the valve port is reduced, and the service life of the electronic expansion valve is prolonged.

Further, a communication passage for communicating the first cavity 21 and the second cavity 513 is provided between the spring housing 51, the bearing 53 and the screw 30. Specifically, gaps are formed among the spring sleeve 51, the bearing 53 and the screw rod 30, the gaps form a communication channel, and through the arrangement of the communication channel, the flow area among the spring sleeve 51, the guide sleeve 40 and the nut sleeve 20 can be increased, so that the flow of fluid among the spring sleeve 51, the guide sleeve 40 and the nut sleeve 20 is smoother, the pressure difference inside the device is further reduced, the reaction speed of the work of the valve body is increased, and the service life of parts is prolonged.

Further, as shown in fig. 4, a second through hole 22 is provided at an end of the nut sleeve 20 close to the valve core assembly 50. The second through hole 22 is arranged at the position, so that the circulation distance of gas among the guide sleeve, the nut sleeve and the accommodating cavity can be shortened, the pressure can be quickly balanced, and the reaction speed of the electronic expansion valve during working is further improved. Moreover, the second through hole 22 is arranged at the bottom of the nut sleeve 20, so that the threaded matching of the nut sleeve 20 and the screw 30 is not influenced.

Wherein, case subassembly 50 still includes pressure cover 56, the outside at needle 52 is established to pressure cover 56 cover, and the one end fixed connection of keeping away from nut cover 20 of pressure cover 56 and spring housing 51, pressure cover 56 includes first post section and second post section, the circumference size of first post section is greater than the circumference size of second post section, spring housing 51 cover is established on the second post section and is supported with the terminal surface looks of first post section, needle 52 supports with the second post section of pressure cover 56, the inner wall of spring housing 51 is laminated with the outside of second post section mutually, can restrict the mobile position of needle 52 in spring housing 51 through setting up pressure cover 56, and can carry out axial positioning to needle 52 through pressure cover 56.

Through the technical scheme provided by the application, a first gap 41 is arranged between the guide sleeve 40 and the spring sleeve 51, a first through hole 514 is arranged on the side wall of the spring sleeve 51, and the first through hole 514 is communicated with the first gap 41, so that the interior of the guide sleeve 40 is communicated with the interior of the spring sleeve 51, namely a second cavity 513, the side wall of the nut sleeve 20 is provided with a second through hole 22 to communicate the accommodating cavity with the first cavity 21, a communication channel is formed among the spring sleeve 51, the bearing 53 and the screw 30, the first cavity 21 is communicated with the second cavity 513, further, fluid among the first cavity 21, the second cavity 513 and the accommodating cavity can mutually circulate, the pressure difference in the valve body 10 is reduced through the structure, and the resistance borne by the screw 30 when the screw 30 drives the valve core assembly 50 to move in the guide sleeve 40 is reduced, so that the overall reaction speed of the device can be improved; and, because the pressure differential that the part receives in the valve body 10 reduces or eliminates, so can lengthen the part life-span.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve body (10) having a receiving cavity;

the nut sleeve (20) is fixedly arranged in the valve body (10), a first cavity (21) and an opening are formed in the nut sleeve (20), the opening is communicated with the first cavity (21), and the opening is positioned at the bottom of the nut sleeve (20);

the screw rod (30) is movably arranged on the valve body (10), and the screw rod (30) is arranged in the nut sleeve (20) in a penetrating mode and is in threaded connection with the nut sleeve (20);

the guide sleeve (40) is arranged in the valve body (10), the guide sleeve (40) is partially positioned in the first cavity (21), and the guide sleeve (40) is communicated with the first cavity (21);

the valve core assembly (50) is arranged in the guide sleeve (40), the screw rod (30) is in driving connection with the valve core assembly (50) so that the valve core assembly (50) can move in the guide sleeve (40), the valve core assembly (50) comprises a spring sleeve (51) and a valve needle (52), the spring sleeve (51) is provided with a first end (511) and a second end (512) which are oppositely arranged, the first end (511) of the spring sleeve (51) is connected with the screw rod (30), the valve needle (52) is arranged at the second end (512) of the spring sleeve (51) in a penetrating mode, the spring sleeve (51) is provided with a second cavity (513), and part of the valve needle (52) is located in the second cavity (513);

wherein, have first clearance (41) between the inner wall of uide bushing (40) and the outer wall of spring housing (51), be provided with first through-hole (514) on the spring housing (51) lateral wall, first through-hole (514) with first clearance (41) intercommunication to make second cavity (513) with the inside of uide bushing (40) is linked together, the cross sectional area of first clearance (41) is 80% to 120% of the cross sectional area of first through-hole (514).

2. An electronic expansion valve according to claim 1, wherein the side wall of the nut sleeve (20) is provided with a second through hole (22), the second through hole (22) communicating the accommodation chamber and the first cavity (21).

3. An electronic expansion valve according to claim 2, wherein the cross-sectional area of the second through-going bore (22) is 80-120% of the cross-sectional area of the first through-going bore (514).

4. An electronic expansion valve according to claim 1, wherein the first through hole (514) is a circular hole, the diameter of the first through hole (514) being in the range of 0.6mm to 1.5 mm.

5. The electronic expansion valve according to claim 1, wherein the valve core assembly (50) further comprises a bearing (53), a gasket (54) and a spring (55) which are sequentially arranged, the bearing (53) comprises an outer ring and an inner ring, the screw (30) is fixedly connected with the inner ring, two ends of the gasket (54) are respectively abutted with one ends of the outer ring and the spring (55), and the other end of the spring (55) is connected with the valve needle (52).

6. An electronic expansion valve according to claim 5, wherein the spring housing (51), the bearing (53) and the screw (30) have a communication channel therebetween for communicating the first cavity (21) and the second cavity (513).

7. The electronic expansion valve according to claim 2, wherein the second through hole (22) is provided at an end of the nut sleeve (20) adjacent to the valve core assembly (50).

8. The electronic expansion valve according to claim 1, wherein the valve core assembly (50) further comprises a pressing sleeve (56), the pressing sleeve (56) is sleeved on the outer side of the valve needle (52), the pressing sleeve (56) is fixedly connected with one end of the spring sleeve (51) far away from the nut sleeve (20), the pressing sleeve (56) comprises a first column section and a second column section, the circumferential dimension of the first column section is larger than that of the second column section, the spring sleeve (51) is sleeved on the second column section and abuts against the end face of the first column section, and the inner wall of the spring sleeve (51) is fitted on the outer side of the second column section.