Electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control, in particular to an electronic expansion valve. An electronic expansion valve comprises a valve seat, a guide sleeve and a piston assembly, and a valve port is formed in the valve seat; a balance channel is arranged in the electronic expansion valve, one end of the balance channel is located at the end, close to the valve port, of the piston assembly and communicated with the valve port, the other end of the balance channel penetrates through the end, away from the valve port, of the guide sleeve, and a filter screen is arranged at the end, close to the valve port, in the balance channel. The filter screen is arranged in a protruding mode in the direction away from the guide sleeve relative to the piston assembly. According to the filter screen, impurities can be prevented from entering the balance channel to affect normal work of the piston assembly, and when the electronic expansion valve is opened, media can flush media accumulated on the outer side face of the protruding part of the filter screen to prevent the filter screen from being blocked.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control technical field, in particular to an electronic expansion valve. BACKGROUND

[0002] Electronic expansion valve is usually used in refrigeration system as throttling element, the piston assembly of electronic expansion valve balances pressure through balance channel in the process of opening or closing valve, can promote electronic expansion valve to open or close smoothly, if the impurity in electronic expansion valve enters balance channel, will lead to piston assembly to be stuck, thereby influence electronic expansion valve normal work.

[0003] In prior art, electronic expansion valve usually does not set filter screen, usually sets filter in refrigeration system to filter impurity, leads to system manufacturer to need to purchase a filter more, increased cost, and increased a welding procedure. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide an electronic expansion valve capable of effectively filtering impurities.

[0005] The utility model provides an electronic expansion valve, including valve seat, guide sleeve and piston assembly, the valve seat has the valve port in, the one end of guide sleeve enters the valve seat in and is sealedly connected with valve seat, piston assembly with guide sleeve sliding connection, with piston assembly can slide relative to valve port, with piston assembly and valve port between distance is changed, electronic expansion valve has balance channel in, one end of balance channel is located piston assembly is close to valve port one end and is communicated valve port, the other end is through guide sleeve far from valve port one end, balance channel in close to valve port one end is equipped with filter screen, filter screen is protruding setting relative to piston assembly towards far from guide sleeve direction.

[0006] It can be understood that the filter screen is arranged at the inlet of the balance channel, which can filter the medium and prevent impurities from entering the balance channel, so that the piston assembly is not stuck and cannot work normally. The impurities will accumulate on the outside of the protruding filter screen. When the electronic expansion valve is in the open state, the medium will flush the protruding part of the filter screen to prevent the filter screen from being blocked.

[0007] In one embodiment, the balance channel has a mounting bracket, the filter screen is mounted in the balance channel through the mounting bracket, the mounting bracket has a mounting slot, one end of the filter screen is clamped into the mounting slot, so that the mounting bracket at least partially wraps the filter screen.

[0008] It can be understood that the mounting strength of the filter screen is enhanced.

[0009] In one embodiment, the inner wall of the balancing channel has a step, and one end of the mounting bracket abuts against the step.

[0010] This setting allows for limiting the position of the filter.

[0011] In one embodiment, the inner wall of the balancing channel has an inclined surface, one end of the mounting bracket is narrowed, and the outer side of the narrowed end of the mounting bracket abuts against the inclined surface.

[0012] This setting allows for limiting the position of the filter.

[0013] In one embodiment, the outer side of the constricted opening of the mounting bracket is interference-fitted with the bevel.

[0014] This design prevents impurities from entering the balancing channel through the gap between the mounting bracket and the ramp.

[0015] In one embodiment, the piston assembly includes a nut seat, a positioning cylinder, and a valve head. The positioning cylinder is movably connected to the guide sleeve. The nut seat is disposed inside the positioning cylinder. The valve head has a communicating hole that communicates with the valve port. The end of the nut seat near the valve head is hollow and communicates with the communicating hole. The filter screen is at least partially disposed inside the communicating hole and protrudes relative to the valve head.

[0016] In one embodiment, the balancing channel is provided with a mounting bracket, the filter screen is mounted in the balancing channel through the mounting bracket, the inner wall of the balancing channel has a step, and one end of the mounting bracket abuts against the step;

[0017] The step is located on the inner wall of the nut seat.

[0018] This design reduces the overall height of the electronic expansion valve.

[0019] In one embodiment, the balancing channel is provided with a mounting bracket, the filter screen is installed in the balancing channel through the mounting bracket, the inner wall of the balancing channel has an inclined surface, one end of the mounting bracket is narrowed, and the outer side of the narrowed part of the mounting bracket abuts against the inclined surface.

[0020] The inclined surface is disposed on the inner wall of the connecting hole.

[0021] This configuration ensures that at least part of the filter screen protrudes from the valve head.

[0022] In one embodiment, the nut seat has a polygonal mounting portion at one end near the valve port, and the positioning cylinder has a mounting hole at one end. The mounting hole is polygonal in shape to fit the mounting portion, and the mounting portion is installed in the mounting hole.

[0023] Understandably, the nut seat and the positioning cylinder are snapped together for easy installation, and the positioning cylinder can circumferentially limit the nut seat.

[0024] In one embodiment, a first balance hole is provided on the side of the nut seat, a second balance hole is provided on the positioning cylinder, and a third balance hole is provided on the guide sleeve. The connecting hole, the interior of the nut seat, the first balance hole, the inner cavity of the positioning cylinder, the second balance hole, the inner cavity of the guide sleeve, and the third balance hole form the balance channel.

[0025] It can be understood that the balancing channel can balance the pressure difference between the two ends of the piston assembly, so that the piston assembly will not be unable to move due to the pressure difference.

[0026] This utility model provides an electronic expansion valve. By setting a filter screen that protrudes relative to the piston assembly at the balance channel opening, at least part of the filter screen is inside the valve opening when the electronic expansion valve is closed. The filter screen can filter out impurities and prevent impurities from entering the balance channel and affecting the normal operation of the piston assembly. During long-term operation, impurities will accumulate on the outer side of the protruding part of the filter screen. When the electronic expansion valve is opened, the medium will flush away the impurities and prevent the filter screen from becoming clogged. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a partial piston assembly provided in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0030] Figure 3 This is a schematic diagram of the structure of a portion of the piston assembly and guide sleeve;

[0031] Figure 4 This is a three-dimensional view of the nut seat;

[0032] Figure 5 This is a cross-sectional view of an electronic expansion valve.

[0033] Reference numerals: 100, Electronic expansion valve; 10, Valve seat; 11, Valve port; 12, First port; 13, Second port; 20, Guide sleeve; 21, Limiting rod; 22, First groove; 23, Second groove; 24, First chamber; 25, Third balance hole; 30, Piston assembly; 31, Nut seat; 311, Mounting part; 312, First balance hole; 32, Screw; 33, Positioning cylinder; 331, Limiting hole; 332, Mounting hole; 333, Positioning sleeve; 334, Positioning piece; 3341, Second balance hole; 34, Valve head; 341, Connecting hole; 40, Balance channel; 41, Filter screen; 42, Mounting bracket; 421, Mounting groove; 43, Step; 44, Inclined surface; 50, Coil assembly; 51, Shell cover; 52, Motor; 521, Gear; 53, Connecting plate; 54, Bearing. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0039] Please see Figure 5 This utility model provides an electronic expansion valve 100 for controlling the flow rate of a medium. It is commonly used in refrigeration systems as one of the four major components of a refrigeration system.

[0040] Specifically, the electronic expansion valve 100 includes a valve seat 10, a guide sleeve 20, and a piston assembly 30. The valve seat 10 has a valve port 11. One end of the guide sleeve 20 extends into the valve seat 10 and is sealed to the valve seat 10. The piston assembly 30 is slidably connected to the guide sleeve 20 so that the piston assembly 30 can move along the guide sleeve 20 within the valve seat 10 to change the distance between the piston assembly 30 and the valve port 11, thereby changing the opening degree of the valve port 11 and realizing flow control.

[0041] The valve seat 10 also has a first port 12 and a second port 13, which are connected through the valve port 11. The first port 12 and the second port 13 are respectively used to connect the connecting pipe.

[0042] Please see Figure 1 and Figure 4 The piston assembly 30 includes a nut seat 31, a screw 32, and a positioning cylinder 33. The nut seat 31 is located inside the positioning cylinder 33 and connected to the positioning cylinder 33. The screw 32 passes through the positioning cylinder 33 and is threadedly connected to the nut seat 31. The screw 32 can rotate. The positioning cylinder 33 is circumferentially limited, thereby restricting the circumferential rotation of the nut seat 31, so that the nut seat 31 and the positioning cylinder 33 can only move axially.

[0043] The guide sleeve 20 is provided with a limiting rod 21, and the positioning cylinder 33 is provided with a limiting hole 331. One end of the limiting rod 21 passes through the limiting hole 331. Since the guide sleeve 20 is connected to the valve seat 10, it will not rotate relative to the valve seat 10. The cooperation between the limiting rod 21 and the limiting hole 331 can realize the circumferential limitation of the positioning cylinder 33, and the limiting rod 21 plays a guiding role in the movement of the positioning cylinder 33.

[0044] One end of the nut seat 31 is provided with a mounting part 311, and the end of the positioning cylinder 33 near the valve port 11 is provided with a mounting hole 332. The mounting hole 332 is polygonal in shape, and the mounting part 311 is also polygonal. The mounting part 311 is installed in the mounting hole 332. The polygonal fit prevents the nut seat 31 from rotating relative to the positioning cylinder 33, thus limiting the nut seat 31 circumferentially by the positioning cylinder 33. It should be noted that the polygon in this utility model can be a triangle, quadrilateral, pentagon, or hexagon or more.

[0045] Please see Figure 3 The positioning cylinder 33 includes a positioning sleeve 333 and a positioning piece 334. The positioning piece 334 is located at the end of the positioning sleeve 333 away from the valve port 11. A limiting hole 331 is formed on the positioning piece 334. A screw 32 passes through the positioning piece 334 and extends into the positioning sleeve 333. The screw 32 and the positioning piece 334 are spaced apart. A nut seat 31 is located inside the positioning sleeve 333, and a mounting hole 332 is located inside the positioning sleeve 333. The positioning cylinder 33 is a separate unit, which facilitates the installation of the nut seat 31.

[0046] The piston assembly 30 also includes a valve head 34, which is located at the end of the positioning sleeve 333 away from the positioning plate 334, and is used to block the valve port 11.

[0047] The valve head 34 and the positioning sleeve 333 are threaded together, making installation convenient.

[0048] Please continue reading Figure 5 The electronic expansion valve 100 has a balance channel 40. One end of the balance channel 40 passes through the end of the guide sleeve 20 away from the valve port 11, and the other end is connected to the valve port 11. It is used to balance the pressure at both ends of the piston assembly 30, so that when the electronic expansion valve 100 is closed or opened, the piston assembly 30 will not be resisted by the pressure difference at both ends, and the piston assembly 30 can move smoothly.

[0049] The nut seat 31 is hollow, the valve head 34 has a connecting hole 341 that communicates with the valve port 11, the nut seat 31 has a first balance hole 312 on its side, the positioning plate 334 has a second balance hole 3341, and the guide sleeve 20 has a third balance hole 25. The connecting hole 341, the inner cavity of the nut seat 31, the first balance hole 312, the inner cavity of the positioning sleeve 333, the second balance hole 3341, the inner cavity of the guide sleeve 20, and the third balance hole 25 form a balance channel 40.

[0050] In one embodiment, the gap between the screw 32 and the positioning piece 334 forms a third balancing hole 25. This arrangement avoids the need for an additional step of setting the third balancing hole 25.

[0051] The inner wall of the balance channel 40 is provided with a filter screen 41, which protrudes relative to the piston assembly 30, that is, protrudes relative to the valve head 34, so that when the electronic expansion valve 100 is closed, at least part of the filter screen 41 is located inside the valve port 11. The filter screen 41 can filter impurities, preventing impurities from entering from the balance channel 40 and affecting the operation of the piston assembly 30. Moreover, since the filter screen 41 is protruding, impurities will accumulate on the outer surface of the protruding part of the filter screen 41. When the electronic expansion valve 100 is opened, the medium will flush away the accumulated impurities, preventing the filter screen 41 from becoming clogged.

[0052] The inner wall of the balance channel 40 is provided with a mounting bracket 42, and the filter screen 41 is installed through the mounting bracket 42.

[0053] One end of the mounting bracket 42 is bent to form a mounting groove 421, and one end of the filter screen 41 is inserted into the mounting groove 421 so that the mounting bracket 42 at least partially covers the filter screen 41, thereby enhancing the installation stability of the filter screen 41.

[0054] Please see Figure 2 The inner wall of the balance channel 40 is provided with a step 43. One end of the mounting bracket 42 abuts against the step 43 to limit the filter screen 41, so as to ensure that a part of the filter screen 41 protrudes out of the piston assembly 30.

[0055] The inner wall of the balance channel 40 has an inclined surface 44. The inclined surface 44 is away from the guide sleeve 20 relative to the step 43. One end of the mounting bracket 42 is narrowed. The outer side of the narrowed part abuts against the inclined surface 44. The inclined surface 44 is used to limit the lower position of the mounting bracket 42. The narrowed mounting bracket 42 can limit the filter screen 41, and the outer side of the narrowed part is adapted to the inclined surface 44.

[0056] The mounting bracket 42 and the inclined surface 44 are interference-fitted to prevent impurities from entering the balance channel 40 through the gap between the mounting bracket 42 and the inclined surface 44.

[0057] The filter screen 41 is at least partially located inside the nut seat 31. In this way, the filter screen 41 does not occupy more space in terms of height, so that the positioning sleeve 333 can have more positions to connect with the valve head 34. More threads can be provided on the positioning sleeve 333, thereby strengthening the connection between the positioning sleeve 333 and the valve head 34.

[0058] In one embodiment, the step 43 is provided inside the nut seat 31, and the inclined surface 44 is provided on the inner wall of the connecting hole 341. This not only allows the filter screen 41 to protrude from the valve head 34, but also ensures that the long filter screen 41 does not occupy more height space.

[0059] The electronic expansion valve 100 also includes a coil assembly 50, which is located at the end of the guide sleeve 20 away from the valve seat 10. The coil assembly 50 is connected to the screw 32 and is used to drive the screw 32 to rotate.

[0060] The coil assembly 50 includes a housing 51, a motor 52, and a connecting plate 53. The motor 52 is mounted on the connecting plate 53 and is located inside the housing 51. The housing 51 and the guide sleeve 20 are fixedly connected.

[0061] The guide sleeve 20 has a first groove 22 and a second groove 23 at its two ends. The first groove 22 faces the coil assembly 50, and the second groove 23 faces the valve port 11. The positioning sleeve 333 and the groove wall of the second groove 23 are slidably connected. The third balance hole 25 connects the first groove 22 and the second groove 23, and the balance channel 40 connects the first groove 22.

[0062] A connecting plate 53 is placed over the opening of the first groove 22 to form a first cavity 24. The output shaft of the motor 52 passes through the connecting plate 53 and extends into the first cavity 24. A gear 521 is provided on the output shaft. The gear 521 is connected to the screw 32 through a bearing 54. The rotation of the gear 521 drives the screw 32 to rotate.

[0063] During operation, the medium enters through the balance channel 40 and is filtered by the filter screen 41. Impurities will adhere to the outer surface of the filter screen 41. When the electronic expansion valve 100 is opened, the medium will flow through the first port 12 and the second port 13. The medium will flush away the impurities attached to the protruding filter screen 41 to prevent the filter screen 41 from becoming clogged.

[0064] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. An electronic expansion valve, comprising a valve seat (10), a guide sleeve (20), and a piston assembly (30), wherein the valve seat (10) has a valve port (11), one end of the guide sleeve (20) extends into the valve seat (10) and is sealed to the valve seat (10), and the piston assembly (30) is slidably connected to the guide sleeve (20) so that the piston assembly (30) can slide relative to the valve port (11) to change the distance between the piston assembly (30) and the valve port (11); Its features are, The electronic expansion valve has a balance channel (40). One end of the balance channel (40) is located at the end of the piston assembly (30) near the valve port (11) and is connected to the valve port (11). The other end passes through the end of the guide sleeve (20) away from the valve port (11). A filter screen (41) is provided at the end of the balance channel (40) near the valve port (11). The filter screen (41) protrudes from the piston assembly (30) in a direction away from the guide sleeve (20).

2. The electronic expansion valve according to claim 1, characterized in that, The balance channel (40) is provided with a mounting bracket (42), and the filter screen (41) is installed in the balance channel (40) through the mounting bracket (42). The mounting bracket (42) has a mounting groove (421), and one end of the filter screen (41) is inserted into the mounting groove (421) so that the mounting bracket (42) at least partially covers the filter screen (41).

3. The electronic expansion valve according to claim 2, characterized in that, The inner wall of the balancing channel (40) has a step (43), and one end of the mounting bracket (42) abuts against the step (43).

4. The electronic expansion valve according to claim 2, characterized in that, The inner wall of the balance channel (40) has an inclined surface (44), one end of the mounting bracket (42) is narrowed, and the outer side of the narrowed part of the mounting bracket (42) abuts against the inclined surface (44).

5. The electronic expansion valve according to claim 4, characterized in that, The outer side of the constricted opening of the mounting bracket (42) is press-fitted with the inclined surface (44).

6. The electronic expansion valve according to claim 1, characterized in that, The piston assembly (30) includes a nut seat (31), a positioning cylinder (33), and a valve head (34). The positioning cylinder (33) is movably connected to the guide sleeve (20). The nut seat (31) is located inside the positioning cylinder (33). The valve head (34) has a connecting hole (341) that communicates with the valve port (11). The end of the nut seat (31) near the valve head (34) is hollow and communicates with the connecting hole (341). The filter screen (41) is at least partially located inside the connecting hole (341) and protrudes relative to the valve head (34).

7. The electronic expansion valve according to claim 6, characterized in that, The balance channel (40) is provided with a mounting bracket (42), and the filter screen (41) is installed in the balance channel (40) through the mounting bracket (42). The inner wall of the balance channel (40) has a step (43), and one end of the mounting bracket (42) abuts against the step (43). The step (43) is located on the inner wall of the nut seat (31).

8. The electronic expansion valve according to claim 6, characterized in that, The balance channel (40) is provided with a mounting bracket (42), and the filter screen (41) is installed in the balance channel (40) through the mounting bracket (42). The inner wall of the balance channel (40) has an inclined surface (44). One end of the mounting bracket (42) is narrowed, and the outer side of the narrowed part of the mounting bracket (42) abuts against the inclined surface (44). The inclined surface (44) is disposed on the inner wall of the connecting hole (341).

9. The electronic expansion valve according to claim 6, characterized in that, The nut seat (31) has a polygonal mounting portion (311) at one end near the valve port (11), and the positioning cylinder (33) has a mounting hole (332) at one end. The mounting hole (332) is polygonal in shape to fit the mounting portion (311), and the mounting portion (311) is installed in the mounting hole (332).

10. The electronic expansion valve according to claim 6, characterized in that, The nut seat (31) has a first balance hole (312) on its side, the positioning cylinder (33) has a second balance hole (3341) on its side, and the guide sleeve (20) has a third balance hole (25). The connecting hole (341), the interior of the nut seat (31), the first balance hole (312), the inner cavity of the positioning cylinder (33), the second balance hole (3341), the inner cavity of the guide sleeve (20), and the third balance hole (25) form the balance channel (40).

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