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, a valve port is formed in the valve seat, one end of the guide sleeve extends into the valve seat and is connected with the valve seat in a sealed mode, and the guide sleeve is connected with the piston assembly in a sliding mode; the piston assembly comprises a positioning cylinder, a screw rod and a nut seat, one end of the positioning cylinder is arranged in the guide sleeve and is in sliding connection with the guide sleeve, the nut seat is arranged in the positioning cylinder and is connected with the positioning cylinder, one end of the screw rod is arranged in the nut seat in a penetrating mode and is in threaded connection with the nut seat, and the other end of the screw rod is in threaded connection with the nut seat. One end of the guide sleeve extends out of the positioning cylinder, the other end of the guide sleeve extends out of the positioning cylinder, a limiting part is arranged on the guide sleeve, a matching part is arranged on the positioning cylinder, and the limiting part is matched with the matching part to limit circumferential rotation of the positioning cylinder, so that the positioning cylinder can slide along the guide sleeve to adjust the opening degree of the valve port.

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, including piston assembly and coil assembly, coil assembly is used to drive piston assembly to move, the working principle of electronic expansion valve is that, coil assembly drives screw rod to rotate first, screw rod drives positioning cylinder to rotate, and positioning cylinder is limited in the circumference, so it converts the circumferential movement into axial movement, if positioning cylinder is not provided with the device that limits it in the circumference, it will not move normally. SUMMARY

[0003] Therefore, it is necessary to provide an electronic expansion valve, which can realize the circumferential limitation of the positioning cylinder, so that the positioning cylinder can move axially.

[0004] The utility model provides an electronic expansion valve, including valve seat, guide bush and piston assembly, the valve seat is opened with valve port, one end of guide bush is in the valve seat and is sealedly connected with the valve seat, guide bush is connected with piston assembly slidingly, piston assembly includes positioning cylinder, screw rod and nut seat, one end of positioning cylinder is located in guide bush and is connected with guide bush slidingly, nut seat is located in positioning cylinder and is connected with positioning cylinder, one end of screw rod is arranged in nut seat and is connected with nut seat threadedly, the guide bush is equipped with limiting portion, the positioning cylinder is equipped with cooperation portion, the limiting portion is cooperated with cooperation portion to limit the circumferential rotation of positioning cylinder, so that positioning cylinder can slide along guide bush to adjust the opening of valve port.

[0005] So setting can realize the circumferential limitation of positioning cylinder, so that positioning cylinder converts the circumferential movement into axial movement, guarantees the effective work of electronic expansion valve.

[0006] In one embodiment, the cooperation portion is a limiting hole, the limiting portion is rod-shaped, and the limiting portion is arranged in the limiting hole.

[0007] So setting can reduce the overall height of electronic expansion valve, and the rod-shaped limiting portion can guide the movement of positioning cylinder.

[0008] In one embodiment, the limiting portion is two, and the two limiting portions are located on the two sides of the screw rod, respectively, the distance between the two limiting portions is d1, the outer diameter of the positioning cylinder is d2, and d1 is greater than or equal to 1 / 2d2.

[0009] So setting can avoid the bending deformation of the limiting portion due to the large torque.

[0010] In one of the embodiments, the diameter of the limiting part is d3, the outer diameter of the positioning cylinder is d2, and d3≥1 / 10d2.

[0011] In this way, the limiting part has sufficient strength to prevent bending deformation.

[0012] In one of the embodiments, the diameter of the limiting part is d3, the length of the limiting part is L, and d3≥1 / 10L.

[0013] In this way, the limiting part has sufficient strength to prevent bending deformation.

[0014] In one of the embodiments, the limiting hole is long strip-shaped.

[0015] In this way, the processing precision requirement can be reduced.

[0016] In one of the embodiments, the positioning cylinder comprises a positioning sleeve and a positioning sheet, the positioning sheet is arranged at one end of the positioning sleeve and is riveted and fixed with the positioning sleeve, the matching part is arranged on the positioning sheet, the screw rod is arranged in the positioning sheet, and the nut seat is arranged in the positioning sleeve.

[0017] In one of the embodiments, the positioning sheet is made of polytetrafluoroethylene.

[0018] In this way, the weight of the electronic expansion valve as a whole can be reduced.

[0019] In one of the embodiments, the thickness of the positioning sheet is t≥3mm.

[0020] In this way, the positioning sheet can be prevented from being deformed due to large torque of the limiting part.

[0021] In one of the embodiments, the positioning sheet is provided with a protrusion, the positioning sleeve is provided with a groove, and the protrusion is clamped into the groove.

[0022] In one of the embodiments, the positioning sheet is provided with a groove, the positioning sleeve is provided with a protrusion, and the protrusion is clamped into the groove.

[0023] In this way, the positioning sheet is positioned during installation.

[0024] The utility model discloses a limiting part is arranged on the guide sleeve, and a matching part is arranged on the positioning cylinder, the limiting part and the matching part are matched, the circumferential limiting of the positioning cylinder is realized, the positioning cylinder can move axially, and the normal work of the electronic expansion valve is realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0026] Figure 1 Part structure schematic diagram of the electronic expansion valve when the limiting part and the matching part are matched;

[0027] Figure 2 Structure schematic diagram of the positioning cylinder;

[0028] Figure 3 Structure schematic diagram of the positioning sheet;

[0029] Figure 4 Sectional view of the electronic expansion valve.

[0030] The drawings show that: 100, electronic expansion valve; 10, valve seat; 11, valve port; 12, first port; 13, second port; 20, guide sleeve; 21, limiting part; 30, piston assembly; 31, positioning cylinder; 311, matching part; 312, positioning sleeve; 3121, groove; 313, positioning sheet; 3131, protrusion; 314, valve head; 32, screw rod; 33, nut seat; 40, coil assembly. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there can be a middle component. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not indicate the only implementation.

[0033] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances, and cannot be construed to indicate or imply relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless otherwise specifically defined and limited, the "upper", "lower", "above", "over", and "on" of the first feature to the second feature can be that the first feature directly contacts the second feature, or the first feature indirectly contacts the second feature through an intermediate medium. Moreover, the "above", "over", and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under", and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0036] Please refer to Figure 4 , Figure 4 The present application provides an electronic expansion valve 100, which is applied to a refrigeration system and used for controlling the flow of medium and realizing the function of throttling and pressure reduction.

[0037] Specifically, the electronic expansion valve 100 comprises a valve seat 10, a guide sleeve 20 and a piston assembly 30. The valve seat 10 has a valve port 11 therein. The guide sleeve 20 is connected with the valve seat 10 and at least partially extends into the valve seat 10 and is in sliding connection with the piston assembly 30. The piston assembly 30 slides and is at different distances from the valve port 11, thereby controlling the opening of the valve port 11 and realizing the control of the flow.

[0038] The valve seat 10 further has a first port 12 and a second port 13, which are communicated through the valve port 11.

[0039] In an embodiment, the axis of the valve port 11 is obliquely arranged relative to the axes of the first port 12 and the second port 13, and the axes of the first port 12 and the second port 13 are parallel, and correspondingly, the piston assembly 30 is also obliquely arranged, which can reduce the height of the electronic expansion valve 100 as a whole, so that the electronic expansion valve 100 can be used in a scene with limited height space. In other embodiments, the axis of the valve port 11 can also be perpendicular to the axes of the first port 12 and the second port 13, the axis of the first port 12 and the axis of the second port 13 are parallel, or the axis of the valve port 11 is parallel to the axis of the first port 12 and perpendicular to the axis of the second port 13, which can be adjusted according to different application scenarios, which is not limited herein.

[0040] The valve seat 10 and the guide sleeve 20 are threadedly connected, the installation is simple, and the thread connection is detachable, so that when the piston assembly 30 is damaged, it can be replaced.

[0041] Further, the piston assembly 30 comprises a positioning cylinder 31, a screw rod 32 and a nut seat 33, one end of the positioning cylinder 31 is slidably connected with the guide sleeve 20 and can move along the guide sleeve 20, the nut seat 33 is arranged in the positioning cylinder 31 and connected with the positioning cylinder 31, and the screw rod 32 is threadedly connected with the nut seat 33. The screw rod 32 rotates, the nut seat 33 has a circumferential movement driving force, and since the positioning cylinder 31 is circumferentially limited, the nut seat 33 is also circumferentially limited, so that the nut seat 33 can only drive the positioning cylinder 31 to move axially.

[0042] The positioning cylinder 31 is provided with a matching part 311, the guide sleeve 20 is provided with a limiting part 21, and the limiting part 21 and the matching part 311 are matched. Since the guide sleeve 20 is connected with the valve seat 10, the positioning cylinder 31 is circumferentially limited by the guide sleeve 20 through the matching of the limiting part 21 and the matching part 311, so as to realize the axial movement of the positioning cylinder 31.

[0043] The limiting part 21 and the guide sleeve 20 are fixedly connected through laser welding, and laser welding can improve the welding efficiency.

[0044] In an embodiment, the limiting part 21 is in the shape of a rod, and the matching part 311 is a limiting hole, and the limiting part 21 extends into the matching part 311. It can be understood that the rod-shaped limiting part 21 can extend into the limiting hole and does not occupy space in height, so that the height of the electronic expansion valve 100 as a whole can be reduced, and the limiting part 21 does not need to be reserved in height during design, so as to reduce the overall height of the electronic expansion valve 100. Meanwhile, the rod-shaped limiting part 21 also plays a guiding role in the movement of the positioning cylinder 31. In other embodiments, the limiting part 21 can also be a limiting hole, and the matching part 311 can be in the shape of a rod.

[0045] Please refer to Figure 1 , Figure 1Fig. 3 is a sectional view of part of the structure of the electronic expansion valve 100 when the limiting portion 21 and the matching portion 311 are matched, the limiting portion 21 is two, and the two limiting portions 21 are respectively arranged on both sides of the screw rod 32. The distance between the two limiting portions 21 is d1, the outer diameter of the positioning cylinder 31 is d2, and d1≥1 / 2d2. It can be understood that if d1 is too small, the torque of the limiting portion 21 limiting the rotation of the positioning cylinder 31 is large, which will cause the rod-shaped limiting portion 21 to deform. d1 can be 1 / 2d2, 2 / 3d2, 4 / 5d2, etc. greater than 1 / 2d2. It needs to be explained that d1 refers to the distance between the central axes of the two limiting portions 21.

[0046] The diameter of the limiting portion 21 is d3, and d3≥1 / 10d2. Similarly, if the thickness of the limiting portion 21 is too small, the rod-shaped limiting portion 21 will also be bent and deformed. d3 can be 1 / 10d2, 1 / 5d2, 1 / 4d2, etc. greater than 1 / 10d2. The limiting portion 21 can be a cylinder or a cuboid. If it is a cuboid, the diameter of the limiting portion 21 refers to the diameter of the circumscribed circle of the cross-sectional of the cuboid.

[0047] The length of the limiting portion 21 is L, and d3≥1 / 10L. Similarly, if the thickness of the limiting portion 21 is too small compared with the length of the limiting portion 21, the limiting portion 21 will be bent. d3 can be 1 / 10L, 1 / 5dL, 1 / 4dL, etc. greater than 1 / 10L.

[0048] The limiting hole is long strip-shaped, which can ensure that the rod-shaped limiting portion 21 can enter the limiting hole. In this way, the machining precision of the limiting hole can be reduced.

[0049] In an embodiment, the limiting hole is a half-waist-shaped hole, one end of which penetrates the outer side of the positioning sheet 313, facilitating machining. In other embodiments, the limiting hole can be a waist-shaped hole, a rectangular hole, etc., and one end can also not penetrate the outer side of the positioning sheet 313.

[0050] Please refer to Figure 2 and Figure 3 , Figure 2 Fig. 2 is a structural schematic diagram of the positioning cylinder 31, Figure 3 Fig. 3 is a structural schematic diagram of the positioning sheet 313. The positioning cylinder 31 includes a positioning sleeve 312 and a positioning sheet 313. The positioning sheet 313 is arranged at one end of the positioning sleeve 312 and is riveted and fixed with the positioning sleeve 312. The matching portion 311 is arranged on the positioning sheet 313. The screw rod 32 is arranged through the positioning sheet 313 and is spaced apart from the positioning sheet 313. The nut seat 33 is arranged in the positioning sleeve 312. It can be understood that the positioning cylinder 31 is split type, which facilitates the installation of the nut seat 33 in the positioning sleeve 312, and then the riveting and fixing of the positioning sheet 313 and the positioning sleeve 312.

[0051] The positioning sheet 313 is made of polytetrafluoroethylene, which can reduce the weight of the electronic expansion valve 100 and has strong corrosion resistance.

[0052] Further, the thickness t of the positioning sheet 313 is greater than or equal to 3 mm. The positioning sheet 313 with the certain thickness can prevent the limiting part 21 from deforming the positioning sheet 313 due to excessive force when limiting the rotation of the positioning sheet 313. The thickness t can be 3 mm, 4 mm, 5 mm, or any value greater than 3 mm.

[0053] In an embodiment, the positioning sheet 313 is provided with a protrusion 3131, and the positioning sleeve 312 is provided with a groove 3121. The protrusion 3131 is clamped into the groove 3121, and the cooperation between the groove 3121 and the protrusion 3131 can position the positioning sleeve 312. In another embodiment, the groove 3121 can be arranged on the positioning sheet 313, and the protrusion 3131 can be arranged on the positioning sleeve 312. In other embodiments, the groove 3121 and the protrusion 3131 are arranged on the positioning sheet 313, and the groove 3121 and the protrusion 3131 are arranged on the positioning sleeve 312. The protrusion 3131 on the positioning sheet 313 is clamped into the groove 3121 on the positioning sleeve 312, and the protrusion 3131 on the positioning sleeve 312 is clamped into the groove 3121 on the positioning sheet 313.

[0054] The end of the positioning sleeve 312 away from the positioning sheet 313 is provided with a valve head 314. The valve head 314 is connected with the positioning sleeve 312, and the valve head 314 can block the valve port 11.

[0055] The positioning sleeve 312 and the valve head 314 are threadedly connected, which is convenient to install.

[0056] Please continue to see Figure 4 The electronic expansion valve 100 further comprises a coil assembly 40. The coil assembly 40 is arranged at the end of the guide sleeve 20 away from the valve seat 10. The end of the screw rod 32 away from the valve port 11 extends out of the guide sleeve 20 and is connected with the coil assembly 40. The coil assembly 40 is used to drive the screw rod 32 to rotate.

[0057] During the working process, the coil assembly 40 drives the screw rod 32 to rotate. The screw rod 32 is threadedly connected with the nut seat 33. Since the nut seat 33 is connected with the positioning sleeve 312, the positioning sleeve 312 is connected with the positioning sheet 313, and the cooperation part 311 on the positioning sheet 313 cooperates with the limiting part 21 on the guide sleeve 20, the positioning sleeve 312 cannot rotate circumferentially, and the nut seat 33 cannot rotate circumferentially. The nut seat 33 converts the circumferential movement into axial movement, thereby driving the positioning sleeve 312 and the valve head 314 to move axially and control the opening size of the valve port 11.

[0058] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not result in contradictions, they shall be considered within the scope of the present disclosure.

[0059] Those skilled in the art should understand that the above embodiments are only used to illustrate the present application, and are not used as a limitation of the present application. Any appropriate changes and modifications made to the above embodiments within the spirit and principles of the present application shall fall within the scope of the present application.

Claims

1. An electronic expansion valve comprising a valve seat (10), a guide sleeve (20) and a piston assembly (30), the valve seat (10) being provided with a valve port (11), one end of the guide sleeve (20) extending into the valve seat (10) and being sealingly connected with the valve seat (10), the guide sleeve (20) being slidingly connected with the piston assembly (30). characterized in that The piston assembly (30) comprises a positioning cylinder (31), a screw rod (32) and a nut seat (33), one end of the positioning cylinder (31) being arranged in the guide sleeve (20) and being slidingly connected with the guide sleeve (20), the nut seat (33) being arranged in the positioning cylinder (31) and being connected with the positioning cylinder (31), one end of the screw rod (32) extending through the nut seat (33) and being threadedly connected with the nut seat (33), the guide sleeve (20) being provided with a limiting portion (21), the positioning cylinder (31) being provided with a matching portion (311), the limiting portion (21) and the matching portion (311) being matched to limit the circumferential rotation of the positioning cylinder (31), so that the positioning cylinder (31) can slide along the guide sleeve (20) to adjust the opening degree of the valve port (11).

2. The electronic expansion valve according to claim 1, characterized in that The matching portion (311) is a limiting hole, and the limiting portion (21) is in the shape of a rod.

3. The electronic expansion valve according to claim 2, wherein The limiting portion (21) is two, and the two limiting portions (21) are respectively located on both sides of the screw rod (32), the distance between the two limiting portions (21) is d1, the outer diameter of the positioning cylinder (31) is d2, and d1 is greater than or equal to 1 / 2d2.

4. The electronic expansion valve according to claim 2, wherein The diameter of the limiting portion (21) is d3, the outer diameter of the positioning cylinder (31) is d2, and d3 is greater than or equal to 1 / 10d2.

5. The electronic expansion valve according to claim 2, wherein The diameter of the limiting portion (21) is d3, the length of the limiting portion (21) is L, and d3 is greater than or equal to 1 / 10L.

6. The electronic expansion valve according to claim 2, wherein The limiting hole is in the shape of a long strip.

7. The electronic expansion valve according to claim 1, wherein The positioning cylinder (31) comprises a positioning sleeve (312) and a positioning sheet (313), the positioning sheet (313) being arranged at one end of the positioning sleeve (312) and being riveted and fixed with the positioning sleeve (312), the matching portion (311) being arranged on the positioning sheet (313), the screw rod (32) extending through the positioning sheet (313), and the nut seat (33) being arranged in the positioning sleeve (312).

8. The electronic expansion valve according to claim 7, characterized in that The positioning sheet (313) is made of polytetrafluoroethylene.

9. The electronic expansion valve according to claim 7, wherein The thickness of the positioning sheet (313) is greater than or equal to 3mm.

10. The electronic expansion valve according to claim 7, wherein The positioning sheet (313) is provided with a protrusion (3131), the positioning sleeve (312) is provided with a groove (3121), and the protrusion (3131) is clamped into the groove (3121). And / or, the positioning sheet (313) is provided with a groove (3121), the positioning sleeve (312) is provided with a protrusion (3131), and the protrusion (3131) is clamped into the groove (3121).

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