CN220749048U - Electronic expansion valve - Google Patents

Abstract

The utility model provides an electronic expansion valve, and relates to the field of expansion valves. The electronic expansion valve comprises a limiting component, a motor rotor component and a valve needle component, and when the electronic expansion valve is installed, the nut block is only required to be matched with the valve needle and then installed into a first groove of the limiting block. Through setting up spacing subassembly of joint and needle subassembly, need not to carry out extra welding for whole reliability is high, and manufacturability is strong, simplifies the assembly between spacing subassembly and needle and the rotary rod, has reduced the assembly degree of difficulty and manufacturing cost. When the electronic expansion valve is used, the rotating rod can be driven to rotate through the motor rotor assembly, so that the rotating rod drives the nut block and the valve needle to move up and down, and the purpose of controlling the flow of the refrigerant by adjusting the opening of the electronic expansion valve is achieved. Meanwhile, the first groove is formed, so that the problem of different shafts between the valve needle and the rotating rod in the machining, manufacturing and assembling process is avoided.

Description

Electronic expansion valve

Technical Field

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

Background

The electronic expansion valve opens or closes a valve port arranged on the valve body through the movement of the valve rod assembly in the guide sleeve and the nut seat, thereby realizing the purposes of flow regulation, throttling and depressurization.

The inventor researches find that the existing electronic expansion valve is complex in process, the gasket type design makes assembly difficult, mass production is difficult, and meanwhile, the gasket is easy to fail due to insufficient welding strength after long-time stress.

Disclosure of Invention

The utility model aims to provide an electronic expansion valve, which can realize the control of the flow rate of a refrigerant by adjusting the opening of the electronic expansion valve, and has the advantages of simple assembly, simple process manufacturability and high reliability.

Embodiments of the present utility model are implemented as follows:

the utility model provides an electronic expansion valve, which comprises a valve needle assembly, a limiting assembly and a motor rotor assembly, wherein the valve needle assembly is arranged on the limiting assembly; the valve needle assembly comprises a valve needle and a nut block, and one end of the valve needle is connected with one end of the nut block; the limiting assembly comprises a limiting block and a valve body, wherein one end of the limiting block is provided with a first groove, the other end of the limiting block is provided with a first opening communicated with the first groove, one end of the valve body is connected with the opening end part of the first groove, and the nut block is limited in the first groove; after the motor rotor assembly passes through the first opening through the rotating rod, the rotating rod is connected with the other end of the nut block through threads.

Further, a second groove is formed in one end of the nut block, a second opening communicated with the first groove is formed in the other end of the nut block, and the rotating rod is connected with the second opening through threads.

Further, the second groove is a strip-shaped through groove, the strip-shaped through groove transversely penetrates through one end of the nut block, and the nut block extends to the center of the nut block along the end part of the strip-shaped through groove to form a first clamping plate.

Further, one end of the valve needle is provided with a second clamping plate, and the valve needle is matched with the first clamping plate of the nut block through the second clamping plate.

Further, a first channel and a second channel penetrating through the valve body are arranged in the valve body, and the first channel and the second channel are communicated and vertically arranged; the other end of the valve needle is connected in the first channel in a sliding way and is attached to the inner wall of the first channel; the first passage or the second passage is used for passing refrigerant.

Further, one end of the valve needle is provided with a third groove, a spring seat is arranged in the third groove, one end of the spring seat is connected with the bottom of the third groove through a spring gasket, and the other end of the spring seat is connected with a spring; the other end of the spring can be in contact with the top end face of the first groove.

Further, the motor rotor assembly comprises a magnetic rotor, a connecting block and a strip-shaped block, the rotating rod penetrates through the connecting block, the magnetic rotor is arranged on the outer wall of the connecting block, a strip-shaped groove is formed between the connecting block and the rotating rod, and the strip-shaped block is arranged in the strip-shaped groove and extends out of the end face of the strip-shaped groove.

Further, the magnetic rotors comprise an upper magnetic rotor and a lower magnetic rotor, wherein one end of the connecting block is provided with the upper magnetic rotor, and the other end of the connecting block is provided with the lower magnetic rotor.

Further, one end of rotary rod is provided with bearing assembly, bearing assembly includes fixed block, metal ring, bearing and retaining ring, be equipped with the fourth recess in the fixed block, the bearing with the laminating of the inner wall of fourth recess, the metal ring the bearing with the retaining ring cup joint in proper order on the rotary rod.

Further, the limiting assembly and the motor rotor assembly are both arranged in the sleeve.

The embodiment of the utility model has the beneficial effects that:

when the electronic expansion valve is installed, the nut block is matched with the valve needle and then is installed into the first groove of the limiting block. Through setting up spacing subassembly of joint and needle subassembly, need not to carry out extra welding for whole reliability is high, and manufacturability is strong, simplifies the assembly between spacing subassembly and needle and the rotary rod, has reduced the assembly degree of difficulty and manufacturing cost.

When the electronic expansion valve is used, the rotating rod can be driven to rotate through the motor rotor assembly, so that the rotating rod drives the nut block and the valve needle to move up and down, and the purpose of controlling the flow of the refrigerant by adjusting the opening of the electronic expansion valve is achieved. Meanwhile, the first groove is formed, so that the problem of different shafts between the valve needle and the rotary rod in the machining, manufacturing and assembling processes is avoided, the up-and-down displacement of the valve needle can be limited, and the opening of the valve needle in the second channel can be accurately controlled.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 2 is a first cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 3 is a second cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 4 is a perspective view of a stopper according to an embodiment of the present utility model;

FIG. 5 is a perspective view of a nut block according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a nut block in an embodiment of the utility model;

FIG. 7 is a perspective view of a valve needle in an embodiment of the present utility model;

FIG. 8 is a top view of a valve needle in an embodiment of the present utility model;

FIG. 9 is a first schematic view of the nut block and valve pin mating in an embodiment of the utility model;

FIG. 10 is a second schematic view of the nut block and valve pin mating in an embodiment of the utility model;

FIG. 11 is a third schematic view of the nut block and valve pin mating in an embodiment of the utility model;

FIG. 12 is a cross-sectional view of FIG. 11;

FIG. 13 is a schematic view of only the stopper cooperating with the needle assembly in an embodiment of the present utility model;

fig. 14 is a perspective view of an electronic expansion valve in an embodiment of the utility model.

Icon: 100-electronic expansion valve; 10-a limiting assembly; 12-limiting blocks; 121-a first groove; 122-a first opening; 20-a motor rotor assembly; 21-a magnetic rotor; 211-upper magnetic rotor; 212-a lower magnetic rotor; 22-connecting blocks; 23-bar blocks; 30-a valve needle assembly; 31-valve needle; 311-a second clamping plate; 312-third grooves; 32-spring seats; 33-spring washers; 34-a spring; 35-nut blocks; 351-a second groove; 352-second opening; 353-a first clamping plate; 40-rotating the rod; 50-valve body; 51-first channel; 52-a second channel; 53-sealing ring; a 60-bearing assembly; 61-a fixed block; 62-metal ring; 63-bearings; 64-check ring; 70-sleeve; 80-shock absorbing pad.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the present embodiment provides an electronic expansion valve 100 for controlling the flow of a refrigerant, and the electronic expansion valve 100 has the advantages of simple assembly, low assembly difficulty, low production cost, high reliability and excellent durability.

Referring to fig. 1-3, an electronic expansion valve 100 of the present embodiment includes a valve needle assembly 30, a limiting assembly 10 and a motor rotor assembly 20; the valve needle assembly 30 comprises a valve needle 31 and a nut block 35, wherein one end of the valve needle 31 is connected with one end of the nut block 35; the limiting assembly 10 comprises a limiting block 12 and a valve body 50, wherein one end of the limiting block 12 is provided with a first groove 121, the other end of the limiting block is provided with a first opening 122 communicated with the first groove 121, one end of the valve body 50 is connected with the opening end part of the first groove 121, and the nut block 35 is limited in the first groove 121; after the motor rotor assembly 20 passes through the first opening 122 by having the rotating rod 40, the rotating rod 40 is screw-coupled with the other end of the nut block 35.

Referring to fig. 2-3, in the motor rotor assembly 20, the motor rotor assembly 20 is fixed to one end of the rotating rod 40, and after the other end of the rotating rod 40 passes through the first opening 122, the rotating rod 40 is connected to the other end of the nut block 35 through threads. The motor rotor assembly 20 is used for driving the rotary rod 40 to rotate.

An external coil is arranged on the outer wall of the electronic expansion valve 100 corresponding to the motor rotor assembly 20, and the coil is electrified to convert electric energy into a magnetic field to drive the motor rotor assembly 20 to rotate, so that the rotating rod 40 is driven to rotate.

Referring to fig. 2-3, in the motor rotor assembly 20, the motor rotor assembly 20 includes a magnetic rotor 21, a connection block 22 and a bar block 23, wherein the rotation rod 40 penetrates through the connection block 22, the magnetic rotor 21 is disposed on an outer wall of the connection block 22, a bar groove is disposed between the connection block 22 and the rotation rod 40, and the bar block 23 is disposed in the bar groove and extends out of an end surface of the bar groove.

The connecting block 22 is of a cylindrical structure, and a through hole for connecting the rotating rod 40 is formed in the center of the connecting block 22; the bottom of the through hole of the connecting block 22 is also provided with a strip-shaped groove, the outer wall of the strip-shaped block 23 with a circular ring structure is attached to the groove surface of the strip-shaped groove, and the inner wall is attached to the rod wall of the rotating rod 40; an annular groove is arranged on the outer wall of the connecting block 22, and a magnetic rotor 21 with a circular ring structure is arranged in the annular groove. After the magnetic rotor 21, the connecting block 22, the bar block 23 and the rotating rod 40 are adhered and fixed, when the external coil is electrified, the magnetic rotor 21 drives the whole motor rotor assembly 20 and the rotating rod 40 to rotate.

The magnetic rotor 21 includes an upper magnetic rotor 211 and a lower magnetic rotor 212, and the connection block 22 has one end provided with the upper magnetic rotor 211 and the other end provided with the lower magnetic rotor 212. Two annular grooves are formed at both ends of the outer wall of the connection block 22, and the upper magnetic rotor 211 and the lower magnetic rotor 212 are respectively arranged in the two annular grooves.

One end of the rotating rod 40 is provided with a bearing assembly 60. The bearing assembly 60 comprises a fixed block 61, a metal ring 62, a bearing 63 and a retainer ring 64, a fourth groove is formed in the fixed block 61, the bearing 63 is attached to the inner wall of the fourth groove, and the metal ring 62, the bearing 63 and the retainer ring 64 are sequentially sleeved on the rotary rod 40. The fixed block 61 is a fourth groove with a multi-step structure at one end, and the metal ring 62, the bearing 63 and the retainer ring 64 are sequentially sleeved on the rotary rod 40; the bearing 63 is clamped on the first step surface of the fourth groove and is attached to the groove wall of the fourth groove; the outer ring of the retainer ring 64 is attached to the second step surface of the fourth groove and is welded and fixed to the fixing block 61, so that the limit function of the bearing assembly 60 is achieved, and the bearing assembly 60 is prevented from falling downwards to be separated from the fixing piece.

A shock absorbing pad 80 is arranged between the retainer ring 64 and the inner ring and the rotary rod 40, the upper end surface of the shock absorbing pad 80 is attached to the lower end surface of the retainer ring 64, and the lower end surface of the shock absorbing pad 80 is attached to the upper end surface of the connecting block 22 for shock absorption.

Referring to fig. 4-13, in the limiting assembly 10, the limiting assembly 10 includes a limiting block 12 and a valve body 50, one end of the limiting block 12 is provided with a first groove 121, the other end is provided with a first opening 122 communicating with the first groove 121, one end of the valve body 50 is connected with an opening end of the first groove 121, and the nut block 35 is limited in the first groove 121.

Referring to fig. 4, in the limiting block 12, one end of the limiting block 12 is provided with a first opening 122, the other end is provided with a first groove 121, and the limiting block 12 is connected with the valve body 50 through the opening end face of the first groove 121; the nut block 35 is fitted in the first groove 121 and can slide up and down in the first groove 121. The first groove 121 of the stopper 12 is identical to the nut block 35 in shape, so that the nut block 35 is stopped in the stopper 12. The nut block 35 is a non-cylindrical heteromorphic column structure, and can be a strip-shaped heteromorphic column structure; specifically, when the nut block 35 is matched with the first groove 121, the nut block 35 is limited in the first groove 121, so that the nut block 35 is prevented from rotating in the first groove 121. In this embodiment, the nut block 35 is a long bar shaped column structure. In other embodiments, the nut block 35 may also have a polygonal columnar structure, a quincuncial columnar structure, an irregular shaped columnar structure, or the like.

Referring to fig. 5-6, in the nut block 35, a second groove 351 is formed at one end of the nut block 35, a second opening 352 is formed at the other end of the nut block, which communicates with the first groove 121, and the rotating rod 40 is connected to the second opening 352 through threads. The second groove 351 is a strip-shaped through groove, the strip-shaped through groove transversely penetrates through one end of the nut block 35, and the nut block 35 extends to the center of the nut block 35 along the end of the strip-shaped through groove to form a first clamping plate 353.

Referring to fig. 2-3, the nut block 35 is provided with an internal thread at the second opening 352, which is matched with an external thread at the lower portion of the rotating rod 40, so that one end of the nut block 35 is screwed with the rotating rod 40. The other end of the nut block 35 is connected to the needle 31, so that the nut block 35 moves up and down in the threaded section of the rotating rod 40 by threads when the motor rotor assembly 20 drives the rotating rod 40 to rotate. Because the nut block 35 is of a strip special-shaped columnar structure, the nut block is limited in the first groove 121 of the limiting block 12; the nut block 35 moves up and down in the first groove 121, the uppermost part of the nut block 35 can be jointed with the top of the first groove 121, and the lowermost part is jointed with the upper end surface of the valve body 50; the up-and-down movement of the nut block 35 drives the needle 31 up-and-down within the valve body 50. In this embodiment, the nut block 35 is provided with an internal thread at the second opening 352 and the rotary rod 40 is provided with an external thread matching it. In other embodiments, the nut block 35 may also be provided with external threads at the second opening 352, and the swivel rod 40 may be provided with mating internal threads.

Referring to fig. 9-13, the valve needle 31 is inserted into the second groove 351 through the second clamping plate 311, so that the lower wall surface of the second clamping plate 311 is attached to the upper wall surface of the first clamping plate 353, and the nut block 35 and the valve needle 31 are matched. The nut block 35 is matched and clamped into the first groove 121 of the limiting block 12, so that limiting between the valve needle 31 and the nut block 35 is realized. Because the shape of the first groove 121 of the limiting block 12 is consistent with the shape of the nut block 35, after the nut block 35 is matched with the valve needle 31, the whole nut block is limited in the limiting block 12, so that the rotation of the valve needle 31 is limited, and the nut block 35 and the valve needle 31 cannot rotate relatively to separate in the movement process. And after the limiting block 12 is combined with the valve body 50, the nut block 35 is limited in the first groove 121, and the limit displacement of the up-and-down movement of the nut block 35 is limited while the nut block 35 translates up and down.

Referring to fig. 7-12, in the valve needle assembly 30, the valve needle assembly 30 includes a valve needle 31, the valve needle 31 is disposed in a valve body 50, the valve body 50 is connected with an end valve body 50 of the first groove 121, and one end of the valve needle 31 is connected with one end of the nut block 35. The valve needle 31 is composed of two cylinders with a large upper part and a small lower part, and the cylinder with a large upper end is connected with the nut block 35.

Referring to fig. 7-8 and fig. 11-12, in the valve needle 31, a third groove 312 is formed at one end of the valve needle 31, a spring seat 32 is disposed in the third groove 312, one end of the spring seat 32 is connected with the bottom of the third groove 312 through a spring spacer 33, and the other end is connected with a spring 34; the other end of the spring 34 can be in contact with the tip end face of the first groove 121.

When the rotating rod 40 drives the nut block 35 to move up and down, the nut block 35 drives the valve needle 31 to move up and down. At the completion of the valve closing action, the lower surface of the interior of the nut block 35 is not in contact with the upper surface of the needle 31. Because there is the action of excessively closing when closing the valve, the nut piece 35 compresses the spring 34, the spring 34 precompression transmits pressure to the valve needle 31, avoid the nut piece 35 directly to support the valve needle 31, the spring 34 plays the effect of protecting the bottom of the valve needle 31, the durability of the valve needle 31 is effectively increased, the spring seat 32 is nonmetallic material, play the supporting role to the spring 34, prevent the compression deformation of the spring 34, set up the spring gasket 33 between spring seat 32 and valve needle 31, can control the size of spring 34 power through the spring gasket 33 of different thickness, the sealing performance is better when the valve needle 31 is excessively closed the bigger the spring 34 power, too big also can lead to the valve needle 31 to excessively contact wearing and tearing with the valve body 50. The compression spring 34 can play a role in buffering when closing the valve, so that abrasion caused by overlarge interaction force when the bottom of the valve needle 31 is contacted with the bottom of the inner cavity of the valve body 50 is effectively reduced, and the durability of the electronic expansion valve 100 is improved.

Referring to fig. 7-10, in the valve needle 31, a second clamping plate 311 is disposed at one end of the valve needle 31, and the valve needle 31 is matched with the first clamping plate 353 of the nut block 35 through the second clamping plate 311.

Referring to fig. 2-3, in the valve body 50 of the limiting assembly 10, the electronic expansion valve 100 further includes a valve body 50, and one end of the valve body 50 is connected to the open end of the first groove 121; the valve body 50 is internally provided with a first channel 51 and a second channel 52 which penetrate through the valve body 50, and the first channel 51 and the second channel 52 are communicated and vertically arranged; the other end of the valve needle 31 is slidingly connected in the first channel 51 and is attached to the inner wall of the first channel 51; the first passage 51 or the second passage 52 is for passing refrigerant.

Referring to fig. 2-3, the valve body 50 has a cylindrical structure, and threads are provided on the valve body 50 for connecting other components for refrigerant. The top of the valve body 50 is provided with a step surface for matching with the opening part of the first groove 121; a first channel 51 and a second channel 52 which are vertical and communicated are arranged in the valve body 50, and a convex valve port is arranged at the lower end of the first channel 51 of the valve body 50 at the intersection of the first channel 51 and the second channel 52; and the valve body 50 is provided with two annular sealing grooves on the outer wall, a sealing ring 53 is arranged in the sealing grooves, and the two sealing grooves are respectively arranged at the upper part and the lower part of the second channel 52.

Because the valve needle 31 has a cylindrical structure with a large top and a small bottom, one end of the valve needle 31 is fixed on the nut block 35, and a cylinder with a large other end can be engaged with the first channel 51 and can slide in the first channel 51. It should be noted that the first channel 51 and the second channel 52 may be mutually used as inlets and outlets. So when the first channel 51 is the inlet, the inlet is filled with the refrigerant, and the valve needle 31 is driven to adjust the flow of the refrigerant in the second channel 52 serving as the outlet. Correspondingly, when the second channel 52 is the inlet, the refrigerant is fully filled in the inlet, and the valve needle 31 is driven to adjust the flow of the refrigerant in the first channel 51 serving as the outlet.

In this embodiment, the first passage 51 is used as an inlet, and the first passage 51 is filled with a refrigerant, and the second passage 52 is used as an outlet. The first channel 51 has a raised valve port at the lower end of the intersection of the first channel 51 and the second channel 52; when the nut block 35 drives the valve needle 31 to move downwards in the first channel 51, the first channel 51 is gradually blocked at the valve port due to the structure of the valve needle 31 with big top and small bottom, and simultaneously the flow rate of the refrigerant in the second channel 52 is gradually reduced; until the stepped surface of the valve needle 31 comes into contact with the raised valve port, both the first passage 51 and the second passage 52 are completely blocked. When the nut block 35 drives the valve needle 31 to move upwards in the first channel 51, the refrigerant in the first channel 51 is led in again, and meanwhile, the flow rate of the refrigerant in the second channel 52 is gradually increased. By controlling the position of the valve needle 31 within the first passage 51, the flow of refrigerant through the second passage 52 can be adjusted.

In this embodiment, both the spacing assembly 10 and the motor rotor assembly 20 are disposed within a sleeve 70. One end of the sleeve 70 is connected with the bottom of the fixed seat, and the other end of the sleeve is connected with the outer wall of the limiting block 12 for lamination; the motor rotor assembly 20 is sleeved in a sleeve 70.

Referring to fig. 2-3, the electronic expansion valve 100 provided in this embodiment is assembled by:

bearing assembly 60 is first assembled: the upper end of the rotating rod 40 is press-fitted with the inner ring of the bearing 63. The metal ring 62 is pressed from the top of the rotating rod 40, and the metal ring 62 is welded to the rotating rod 40. The bearing 63 is pressed into the fixing piece, the retainer ring 64 is sleeved from the lower part of the rotary rod 40, the retainer ring 64 is contacted with the lower surface plane of the bearing 63, the retainer ring 64 is welded with the fixing piece, the retainer ring 64 plays a role in limiting the bearing 63, the bearing 63 is prevented from falling downwards to be separated from the fixing piece, and the reliability of the welded bearing 63 retainer ring 64 is high. The assembly of the bearing assembly 60 is completed.

Mounting the motor rotor assembly 20: the upper magnetic rotor 211 and the lower magnetic rotor 212 are respectively adhered and fixed in the two annular grooves of the connecting block 22, and the shock pad 80, the connecting block 22 and the bar-shaped block 23 are sequentially sleeved and assembled from the lower part of the rotating rod 40. The bar block 23 is matched with the bar groove at the bottom of the connecting block 22, and the lower surface of the bar block 23 is higher than the lower surface of the connecting block 22 after assembly, so that the lower surface of the bar block 23 and the rotating rod 40 are welded and fixed. Finally, the sleeve 70 is sleeved from below and abuts against the boss at the bottom of the fixing piece, and the sleeve is welded with the fixing piece, so that the motor rotor assembly 20 is assembled.

Mounting the valve needle assembly 30: the spring 34 pad, the spring seat 32, and the spring 34 are sequentially fitted into the third recess 312 of the needle 31. The nut block 35 is then engaged with the needle 31, the needle 31 is pressed from the second groove 351 of the strip-shaped through groove, the spring 34 is pressed, and then the nut block 35 is rotated to attach and clamp the first clamping plate 353 and the second clamping plate 311. The top surface of the second groove 351 of the nut block 35 contacts with the upper surface of the spring 34, and the upper surface of the valve needle 31 is far away from the top surface of the second groove 351 of the nut block 35 under the action of the elasticity of the spring 34; and the two second engagement plates 311 of the needle 31 are respectively engaged with the two first engagement plates 353 of the nut block 35. Thereby completing the valve pin assembly 30 assembly.

Mounting a limiting assembly 10: the needle assembly 30 is fitted into the first recess 121 of the stopper 12 together with the nut block 35. The assembly of the spacing assembly 10 is completed.

Mounting the assembled motor rotor assembly 20 and the assembled spacing assembly 10: the external thread at the lower part of the rotary rod 40 is matched and screwed with the internal thread at the second opening 352 of the nut block 35 until the lower end of the sleeve 70 is jointed with the boss outside the limiting block 12, and then welded and fixed.

Mounting a valve body 50: the limiting block 12 is assembled with the valve body 50, a gap is reserved between the boss plane at the upper part of the valve body 50 and the lower plane of the inner cavity of the first groove 121 of the limiting block 12, interference caused by machining errors is prevented, the problem that the rotating rod 40 is not coaxial with the valve needle 31 is avoided, and the assembly difficulty is reduced. The bottom of the first groove 121 of the limiting block 12 is welded and fixed with a boss on the upper part of the valve body 50.

I.e., the entire electronic expansion valve 100 is completely assembled.

Referring to fig. 2-3, the working principle of the electronic expansion valve 100 provided in this embodiment is:

an external coil is arranged on the outer wall of the electronic expansion valve 100 corresponding to the motor rotor assembly 20, and when the coil is electrified to convert electric energy into a magnetic field to drive the magnetic rotor 21, the magnetic rotor 21 drives the motor rotor assembly 20 to rotate, so that the rotary rod 40 is driven to rotate.

The rotating rod 40 rotates, the nut block 35 moves up and down through the threaded section of the rotating rod 40 in a threaded connection manner, and the nut block 35 is limited in the first groove 121 of the limiting block 12 due to the long-strip special-shaped columnar structure; so that the nut block 35 moves up and down in the first groove 121.

As the nut block 35 moves upward: when the upper surface of the nut block 35 contacts the top surface of the first groove 121 of the stopper 12, the nut block 35 is restricted from moving upward, which is the upward limit position of the nut block 35. When the nut block 35 moves upwards, the valve needle 31 is driven to move upwards in the first channel 51, so that the opening of the valve needle 31 in the second channel 52 is increased, and the second channel 52 can pass through the refrigerant; the nut block 35 can only be limited to the upper limit position at the top, so that the valve needle 31 cannot be opened too much to cause excessive flow, and the nut block 35 is at failure risk.

As the nut block 35 runs down: when the lower surface of the nut block 35 contacts the upper surface of the upper portion of the valve body 50, the nut block 35 is restricted from continuing to move downward, which is the downward limit position of the nut block 35. When the nut block 35 moves downwards, the top surface of the second groove 351 of the nut block 35 compresses the spring 34 downwards, so that the valve needle 31 moves downwards in the first channel 51, the opening of the valve needle 31 in the second channel 52 is reduced until the second channel 52 is closed, and the refrigerant cannot pass through the two channels; the nut block 35 can only be limited to the downward limit position so that the valve needle 31 does not over close causing the spring 34 to fail with the valve needle 31. Since the compression amount is limited, the spring 34 is not always compressed, the failure of the spring 34 and the abrasion of the bottom of the needle 31 are reduced, and the durability of the electronic expansion valve 100 is improved.

In summary, the nut block 35 is limited in the limiting space in the first groove 121 to slide up and down; the limiting mode ensures that the valve is not easy to generate serious failure in actual application; the nut block 35 is not at failure risk due to excessive flow caused by excessive opening; at the same time, the valve needle assembly 30 is not disabled by overstretching. Limiting the travel of the needle assembly 30 by the limit space is more advantageous for program control to find the zero point position and the full open point position.

In the electronic expansion valve 100 provided by the utility model, when in installation, only the nut block 35 with the special-shaped columnar structure is matched with the valve needle 31 and then is installed into the first groove 121 of the limiting block 12. By arranging the limiting assembly 10 to replace the original gasket, additional welding is not needed, so that the whole reliability is high, the manufacturability is strong, the assembly between the limiting assembly 10 and the valve needle 31 and the rotating rod 40 is simplified, and the assembly difficulty and the production cost are reduced.

When the electronic expansion valve 100 is used, the motor rotor assembly 20 can drive the rotary rod 40 to rotate, so that the rotary rod 40 drives the nut block 35 and the valve needle 31 to move up and down, and the purpose of controlling the flow rate of the refrigerant by adjusting the opening of the electronic expansion valve 100 is achieved. Meanwhile, the first groove 121 avoids the problem of different axes between the valve needle 31 and the rotary rod 40 in the machining, manufacturing and assembling processes, and can limit the up-and-down displacement of the valve needle 31 and accurately control the opening of the valve needle 31 in the second channel 52.

The utility model further improves the durability of the electronic expansion valve 100 by arranging the spring 34 on the valve needle assembly 30, and simultaneously reducing the abrasion of the bottom of the valve needle 31 by the spring 34.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An electronic expansion valve, comprising:

the valve needle assembly comprises a valve needle and a nut block, and one end of the valve needle is connected with one end of the nut block;

the limiting assembly comprises a limiting block and a valve body, wherein one end of the limiting block is provided with a first groove, the other end of the limiting block is provided with a first opening communicated with the first groove, one end of the valve body is connected with the opening end part of the first groove, and the nut block is limited in the first groove;

and the motor rotor assembly passes through the first opening through a rotating rod, and the rotating rod is connected with the other end of the nut block through threads.

2. The electronic expansion valve of claim 1, wherein a second groove is formed in one end of the nut block, a second opening communicated with the first groove is formed in the other end of the nut block, and the rotating rod is connected with the second opening through threads.

3. The electronic expansion valve of claim 2, wherein the second groove is a strip-shaped through groove extending transversely through one end of the nut block, and the nut block extends along an end of the strip-shaped through groove toward a center of the nut block with a first clamping plate.

4. The electronic expansion valve of claim 3, wherein one end of the valve needle is provided with a second snap plate through which the valve needle mates with the first snap plate of the nut block.

5. The electronic expansion valve of claim 1, wherein a first channel and a second channel penetrating the valve body are provided in the valve body, and the first channel and the second channel are communicated and vertically arranged;

the other end of the valve needle is connected in the first channel in a sliding way and is attached to the inner wall of the first channel;

the first passage or the second passage is used for passing refrigerant.

6. The electronic expansion valve of claim 1, wherein a third groove is formed in one end of the valve needle, a spring seat is arranged in the third groove, one end of the spring seat is connected with the bottom of the third groove through a spring gasket, and the other end of the spring seat is connected with a spring;

the other end of the spring can be in contact with the top end face of the first groove.

7. The electronic expansion valve of claim 1, wherein said motor rotor assembly comprises a magnetic rotor, a connecting block and a bar block,

the rotating rod penetrates through the connecting block, the magnetic rotor is arranged on the outer wall of the connecting block,

a bar-shaped groove is arranged between the connecting block and the rotating rod, and the bar-shaped block is arranged in the bar-shaped groove and extends out of the end face of the bar-shaped groove.

8. The electronic expansion valve of claim 7, wherein said magnetic rotors comprise an upper magnetic rotor and a lower magnetic rotor, said connection block having one end provided with said upper magnetic rotor and the other end provided with said lower magnetic rotor.

9. The electronic expansion valve of claim 7, wherein one end of the rotary rod is provided with a bearing assembly,

the bearing assembly comprises a fixed block, a metal ring, a bearing and a retainer ring, wherein a fourth groove is formed in the fixed block, the bearing is attached to the inner wall of the fourth groove, and the metal ring, the bearing and the retainer ring are sequentially sleeved on the rotating rod.

10. The electronic expansion valve of claim 1, wherein the limit assembly and the motor rotor assembly are both disposed within a sleeve.