Multi-stage action electronic expansion valve and valve element structure

Abstract

The invention relates to the technical field of electronic expansion valves, in particular to a multi-stage action electronic expansion valve and a valve core structure, the multi-stage action electronic expansion valve comprises a screw rod assembly, a magnetic rotor assembly and a valve needle assembly, the screw rod assembly comprises a nut sleeve and a screw rod, and the screw rod is provided with a first end and a second end; the magnetic rotor assembly is connected to the first end of the screw rod; the valve needle assembly is connected to the second end of the screw and comprises a valve needle sleeve, a spring installed in the valve needle sleeve and a check ring arranged at the open end of the valve needle sleeve. A supporting seat is arranged at the second end of the screw rod; the supporting seat is embedded into the valve needle sleeve and is propped against the spring; a first end face bearing is arranged on the screw, a step shaft extends out of the end, away from the first end face bearing, of the supporting base, a check ring is arranged at the step shaft, and a second end face bearing is arranged between the check ring and the end face of the step shaft. Through the arrangement of the first end face bearing, the second end face bearing and the supporting base, the valve needle is prevented from generating micro motion in the circumferential direction, abrasion of the end of the valve needle is reduced, and the closing reliability of the electronic expansion valve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic expansion valves, and in particular to a multi-stage action electronic expansion valve and a valve core structure. Background Art

[0002] As an electronic control component, the electronic expansion valve is widely used in refrigeration systems because of its high precision, fast and accurate action, and obvious energy-saving effect.

[0003] In the prior art, the electronic expansion valve includes components such as a valve seat assembly, a nut assembly, an elastic assembly, a valve needle assembly and a magnetic rotor assembly. The valve seat assembly is provided with a valve port. When the electronic expansion valve is working, the magnetic rotor assembly is driven to rotate by an energized coil surrounding the outside of the valve housing, thereby driving the screw in the nut assembly to produce circular motion. At the same time, the axial movement generated is transmitted to the valve needle through the elastic assembly, thereby controlling the opening or closing of the valve port, thereby achieving the functions of throttling, reducing pressure and regulating flow.

[0004] However, when the elastic component is installed, both ends of the elastic component are in direct contact with the valve needle and the screw. Under the influence of friction, the spring component is compressed at the moment the valve port is closed. The friction force will cause the valve needle to move slightly in the circumferential direction. When the electronic expansion valve needs to be opened and closed frequently, this slight movement will cause wear on the end of the valve needle, seriously affecting the closing reliability of the electronic expansion valve. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-stage action electronic expansion valve and a valve core structure to effectively solve the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a multi-stage action electronic expansion valve and valve core structure, including: A screw assembly comprises a nut sleeve and a screw installed in the nut sleeve, wherein the screw has a first end and a second end arranged opposite to each other; a magnetic rotor assembly connected to the first end of the screw; A valve needle assembly, connected to the second end of the screw rod, comprises a valve needle sleeve, a spring installed in the valve needle sleeve, and a limit retaining ring arranged at the open end of the valve needle sleeve; Wherein, a support seat is provided at the second end of the screw rod, and the support seat is embedded in the valve needle sleeve and abuts against the spring; The screw rod is provided with a first end face bearing on the mounting shaft located between the support seat and the limit retaining ring, a step shaft for guiding the spring is extended from one end of the support seat away from the first end face bearing, and a shaft end retaining ring is provided at the second end of the screw rod extending out of the step shaft, and a second end face bearing is provided between the shaft end retaining ring and the end face of the step shaft.

[0007] Furthermore, the magnetic rotor assembly includes a rotating sleeve and an adapter plate connecting the rotating sleeve and the screw; the adapter plate and the screw are fixed by welding; The inner side wall of the rotating sleeve is provided with a groove for the adapter plate to be embedded, the outer side surface of the adapter plate is provided with a plurality of positioning grooves, and the inner annular surface of the groove is provided with a protrusion that matches with the positioning groove; And the end surface of the adapter plate is provided with a through hole.

[0008] Furthermore, a limiting component for limiting the rotation angle of the rotating sleeve is provided in the annular gap between the nut sleeve and the rotating sleeve; The limit assembly includes a spiral slide rail sleeved on the outside of the nut sleeve, and a stop ring wound on the spiral slide rail, one end of the spiral slide rail is fixed on the outer cylindrical surface of the nut sleeve, and the other end is fixed on one end of the nut sleeve close to the valve needle assembly; The inner side wall of the rotating sleeve is provided with a guide strip along the axial direction, and one end of the stop ring abuts against the guide strip.

[0009] Furthermore, a plurality of spring plungers are provided on the outer cylindrical surface of the rotating sleeve away from one end of the adapter plate; The plurality of spring plungers are evenly distributed along the circumferential direction.

[0010] Furthermore, a plurality of spring plungers are provided on the outer cylindrical surface of the rotating sleeve away from one end of the adapter plate; The plurality of spring plungers are distributed along a spiral track.

[0011] Furthermore, a ball is provided in the inner hole of the valve needle sleeve for accommodating the spring; The spring abuts against the ball.

[0012] Furthermore, the support seat is provided with a first tapered surface abutting against the spring.

[0013] Furthermore, a guide sleeve is provided on the outer sleeve of the valve needle assembly; a mounting groove for mounting the nut sleeve and a guide groove for sliding the valve needle sleeve are provided in the guide sleeve; The guide sleeve is provided with a first passage and a second passage communicating with the valve body, and a valve port is formed at the intersection of the first passage and the second passage.

[0014] Furthermore, it also includes a sleeve assembly, which includes a protective cover and a fixing seat for supporting and installing the protective cover; The fixing seat sleeve is arranged above the guide sleeve, and a connecting piece is arranged on the inner side wall of the fixing seat, and the connecting piece is connected to the nut sleeve.

[0015] The present invention also provides a multi-stage action electronic expansion valve, comprising: Valve body; and a valve core structure as claimed in any one of claims 1 to 9, which is arranged above the valve body; and an electromagnetic coil assembly for driving the magnetic rotor assembly to rotate.

[0016] The beneficial effects of the present invention are as follows: the present invention can avoid micro-movement of the valve needle in the circumferential direction, reduce the wear of the valve needle end, and improve the closing reliability of the electronic expansion valve through the arrangement of the first end face bearing, the second end face bearing and the support seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is an axonometric exploded schematic diagram of the valve core structure; Figure 2 It is a cross-sectional schematic diagram of the valve core structure; Figure 3 This is a schematic diagram of the installation of the screw and the adapter plate; Figure 4 It is a schematic diagram of the connection cross section between the rotating sleeve and the adapter plate; Figure 5 A schematic diagram of the sliding of the stop ring relative to the spiral slide rail; Figure 6 It is a schematic diagram of the installation of the first end bearing and the second end bearing on the support seat; Figure 7 for Figure 2 A local enlarged view of point A; Figure 8 It is a structural schematic diagram of the guide sleeve and the casing assembly; Fig. 9 Schematic diagram of the structure of a multi-stage action electronic expansion valve in an embodiment of the present invention.

[0019] 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1. The nut sleeve of the embodiment of the present invention is as follows: 1 DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] like Figures 1 to 8 The multi-stage action electronic expansion valve and valve core structure shown include: a screw 12 assembly 1, a magnetic rotor assembly 3 and a valve needle assembly 2; The screw rod 12 assembly 1 comprises a nut sleeve 11 and a screw rod 12 installed in the nut sleeve 11, wherein the screw rod 12 has a first end and a second end which are arranged opposite to each other; The magnetic rotor assembly 3 is connected to the first end of the screw 12; The valve needle assembly 2 is connected to the second end of the screw rod 12, and includes a valve needle sleeve 21, a spring 22 installed in the valve needle sleeve 21, and a limit retaining ring 23 arranged at the open end of the valve needle sleeve 21; Among them, the second end of the screw 12 is provided with a support seat 4, the support seat 4 is embedded in the valve needle sleeve 21 and abuts against the spring 22, and the screw 12 is provided with a first end face bearing 5 on the mounting shaft located between the support seat 4 and the limit retaining ring 23. The support seat 4 extends a step shaft 41 for guiding the spring 22 at one end away from the first end face bearing 5, and a shaft end retaining ring 6 is provided at the second end of the screw 12 extending out of the step shaft 41, and a second end face bearing 7 is provided between the shaft end retaining ring 6 and the end face of the step shaft 41.

[0024] During operation, the energized coil surrounding the outside of the valve housing generates a magnetic field, driving the magnetic rotor assembly 3 to rotate, and synchronously driving the screw 12 to perform circular motion. At the same time, the screw 12 performs axial telescopic motion relative to the nut sleeve 11, and transmits the axial movement to the valve needle through the spring 22, thereby controlling the opening and closing of the valve port, achieving throttling, pressure reduction and flow regulation.

[0025] Specifically, when the screw 12 moves downward, the screw 12 will drive the support seat 4 to compress the spring 22. The reaction force of the spring 22 causes the support seat 4 and the mounting shaft step on the screw 12 to clamp the first end face bearing 5. At this time, the screw 12 is rotated through the first end face bearing 5, and the support seat 4 does not generate a rotational force. When the screw 12 moves upward, the limit ring 23 restricts the upward movement of the first end face bearing 5, and the shaft end retaining ring 6 and the support seat 4 will form a clamping force on the second end face bearing 7. At this time, the screw 12 is rotated through the second end face bearing 7, and the support seat 4 does not generate a rotational force.

[0026] By providing the first end bearing 5, the second end bearing 7 and the support seat 4, the screw 12 can achieve axial movement while avoiding micro-movement of the valve needle in the circumferential direction, thereby reducing the wear of the valve needle end and improving the closing reliability of the electronic expansion valve.

[0027] In the present invention, the magnetic rotor assembly 3 includes a rotating sleeve 31 and an adapter plate 32 connecting the rotating sleeve 31 and the screw 12; the adapter plate 32 and the screw 12 are fixed by welding; it is ensured that the adapter plate 32 and the screw 12 will not move relative to each other or loosen under high load or vibration conditions, thereby enhancing the reliability of the structure; the inner side wall of the rotating sleeve 31 is provided with a groove 311 for the adapter plate 32 to be embedded, the outer side surface of the adapter plate 32 is provided with a plurality of positioning grooves 321, and the inner annular surface of the groove 311 is provided with a protrusion 312 that cooperates with the positioning groove 321; the cooperation between the groove 311 and the protrusion 312 provides precise positioning and fixation, ensuring the correct position of the adapter plate 32 in the rotating sleeve 31, so as to facilitate the transmission of the rotation of the rotating sleeve 31 to the screw 12, and the end surface of the adapter plate 32 is provided with a through hole to form a heat dissipation channel, and during the rotation of the rotating plate, the air flow speed is accelerated to achieve a rapid cooling effect on the inside of the electronic expansion valve.

[0028] In order to ensure precise control of the electronic expansion valve, a limit assembly 33 for limiting the rotation angle of the rotating sleeve 31 is provided in the annular gap between the nut sleeve 11 and the rotating sleeve 31; the limit assembly 33 includes a spiral slide rail 331 sleeved on the outside of the nut sleeve 11, and a stop ring 332 wound on the spiral slide rail 331, one end of the spiral slide rail 331 is fixed on the outer cylindrical surface of the nut sleeve 11, and the other end is fixed on one end of the nut sleeve 11 close to the valve needle assembly 2; a guide strip 313 is provided on the inner side wall of the rotating sleeve 31 along the axial direction, and one end of the stop ring 332 abuts against the guide strip 313.

[0029] When the rotating sleeve 31 rotates around the axis, the guide bar 313 drives the stop ring 332 to slide on the spiral slide rail 331 along a predetermined path, and the stop ring 332 can move according to the position change of the rotating sleeve 31 to achieve dynamic limiting, so as to accurately control the axial movement distance of the screw 12, ensure that the valve needle sleeve 21 can correctly close or open the valve port, meet specific flow control and throttling requirements, and through the setting of the limit assembly 33, effectively prevent the rotating sleeve 31 from excessive rotation, avoid excessive extension or compression of the screw 12 and the valve needle assembly 2, and protect the components from damage.

[0030] As a preferred embodiment of the above, in order to improve the axial stability of the rotating sleeve 31 during the rotation process, a plurality of spring 22 plungers are provided on the outer cylindrical surface of the rotating sleeve 31 at one end away from the adapter plate 32; preferably, the plurality of spring 22 plungers are evenly distributed along the circumferential direction. The centering effect provided by the spring 22 plunger can improve the rotation accuracy of the rotating sleeve 31, avoid swinging or offset during the rotation process, and ensure its stability during the rotation process. As another preferred embodiment, the plurality of spring 22 plungers are distributed along a spiral track.

[0031] In the present invention, a ball 24 is provided in the inner hole of the valve needle sleeve 21 for accommodating the spring 22, and the spring 22 abuts against the ball 24. The point contact of the ball 24 makes the positioning of the valve needle more precise, which helps to achieve more precise flow control.

[0032] In the preferred embodiment, the support seat 4 is provided with a first tapered surface 42 abutting against the spring 22. The tapered surface can achieve self-centering, and the spring 22 can also maintain the correct position and alignment under load or pressure changes, thereby improving the stability and reliability of the entire system.

[0033] In the preferred embodiment of the present invention, a guide sleeve 9 is provided on the outside of the valve needle assembly 2; the existence of the guide sleeve 9 reduces the direct contact between the valve needle sleeve 21 and the valve body 100, thereby reducing friction and wear, and the guide sleeve 9 is provided with a mounting groove 91 for the nut sleeve 11 to be installed, and a guide groove 92 for the valve needle sleeve 21 to slide; the nut sleeve 11 and the valve needle sleeve 21 can be accurately positioned and slided stably in the axial direction, and the guide sleeve 9 is provided with a first passage 93 and a second passage 94 connected to the valve body 100, and a valve port is formed at the intersection of the first passage 93 and the second passage 94. It can ensure that the valve needle accurately reaches and closes the valve port, and improves the sealing performance.

[0034] In another preferred embodiment, the valve core structure further includes a sleeve assembly 10, which includes a protective cover 101 and a fixing seat 102 that supports and installs the protective cover 101; the fixing seat 102 is sleeved on the top of the guide sleeve 9, and a connecting piece 103 is provided on the inner side wall of the fixing seat 102, and the connecting piece 103 is connected to the nut sleeve 11. The connecting piece 103 is a split structure. During the installation process, the connecting piece 103 is assembled at the installation position of the nut sleeve 11 and connected to the fixing seat 102 by welding. The design of the fixing seat 102 and the connecting piece 103 helps to reduce the vibration and noise of the guide sleeve 9 during the movement process and improve the stability of the operation.

[0035] like Fig. 9 As shown, the present invention also provides a multi-stage action electronic expansion valve, comprising: a valve body 100; a valve core structure arranged above the valve body 100; and an electromagnetic coil group 200 for driving the magnetic rotor assembly 3 to rotate.

[0036] The electromagnetic expansion valve in the present invention can accurately adjust the refrigerant flow entering the refrigeration device according to a preset program to achieve precise flow control, and through the application of the valve core structure, effectively avoid the wear of the valve needle and the valve port, and extend the service life of the valve needle. The technicians in this industry should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the description are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A valve core structure, characterized in that: include: A screw assembly comprises a nut sleeve and a screw installed in the nut sleeve, wherein the screw has a first end and a second end arranged opposite to each other; a magnetic rotor assembly connected to the first end of the screw; A valve needle assembly, connected to the second end of the screw rod, comprises a valve needle sleeve, a spring installed in the valve needle sleeve, and a limit retaining ring arranged at the open end of the valve needle sleeve; Wherein, a support seat is provided at the second end of the screw rod, and the support seat is embedded in the valve needle sleeve and abuts against the spring; The screw rod is provided with a first end face bearing on the mounting shaft located between the support seat and the limit retaining ring, a step shaft for guiding the spring is extended from one end of the support seat away from the first end face bearing, and a shaft end retaining ring is provided at the second end of the screw rod extending out of the step shaft, and a second end face bearing is provided between the shaft end retaining ring and the end face of the step shaft.

2. The valve core structure according to claim 1, characterized in that: The magnetic rotor assembly includes a rotating sleeve and an adapter plate connecting the rotating sleeve and the screw; the adapter plate and the screw are fixed by welding; The inner side wall of the rotating sleeve is provided with a groove for the adapter plate to be embedded, the outer side surface of the adapter plate is provided with a plurality of positioning grooves, and the inner annular surface of the groove is provided with a protrusion that matches with the positioning groove; And the end surface of the adapter plate is provided with a through hole.

3. The valve core structure according to claim 2, characterized in that: A limit assembly for limiting the rotation angle of the rotating sleeve is provided in the annular gap between the nut sleeve and the rotating sleeve; The limit assembly includes a spiral slide rail sleeved on the outside of the nut sleeve, and a stop ring wound on the spiral slide rail, one end of the spiral slide rail is fixed on the outer cylindrical surface of the nut sleeve, and the other end is fixed on one end of the nut sleeve close to the valve needle assembly; The inner side wall of the rotating sleeve is provided with a guide strip along the axial direction, and one end of the stop ring abuts against the guide strip.

4. The valve core structure according to claim 2, characterized in that: A plurality of spring plungers are provided on the outer cylindrical surface of one end of the rotating sleeve away from the adapter plate; The plurality of spring plungers are evenly distributed along the circumferential direction.

5. The valve core structure according to claim 2, characterized in that: A plurality of spring plungers are provided on the outer cylindrical surface of one end of the rotating sleeve away from the adapter plate; The plurality of spring plungers are distributed along a spiral track.

6. The valve core structure according to claim 1, characterized in that: A ball is provided in the inner hole of the valve needle sleeve for accommodating the spring; The spring abuts against the ball.

7. The valve core structure according to claim 1, characterized in that: The support seat is provided with a first tapered surface abutting against the spring.

8. The valve core structure according to claim 1, characterized in that: A guide sleeve is provided on the outer sleeve of the valve needle assembly; a mounting groove for mounting the nut sleeve and a guide groove for sliding the valve needle sleeve are provided in the guide sleeve; The guide sleeve is provided with a first passage and a second passage communicating with the valve body, and a valve port is formed at the intersection of the first passage and the second passage.

9. The valve core structure according to claim 1, characterized in that: Also included is a sleeve assembly, the sleeve assembly including a protective cover and a fixing seat for supporting and installing the protective cover; The fixing seat sleeve is arranged above the guide sleeve, and a connecting piece is arranged on the inner side wall of the fixing seat, and the connecting piece is connected to the nut sleeve.

10. A multi-stage electronic expansion valve, characterized in that: include: Valve body; and a valve core structure as claimed in any one of claims 1 to 9, which is arranged above the valve body; and an electromagnetic coil assembly for driving the magnetic rotor assembly to rotate.

Images