An electronic expansion valve for a vehicle thermal management system

Abstract

The present invention discloses an electronic expansion valve for a vehicle thermal management system, which relates to the technical field of electronic expansion valves. It includes a valve block. An output port is provided on one side of the valve block, and an input port is provided on the other side of the valve block. An installation groove is provided on the upper surface of the valve block. The output port is communicated with the input port through the installation groove. A valve sleeve is placed in the valve block within the installation groove. A valve core structure is slidably sleeved inside the valve sleeve, and a return spring is sleeved outside the valve core structure. The valve block is provided with internal threads at the installation groove, and the valve block is threadedly connected with a locking nut through the internal threads. The locking nut and the valve sleeve are sleeved with each other. A sealing sleeve is fixedly sleeved on the outer wall of the top of the valve sleeve, and a rotor assembly is arranged inside the sealing sleeve. Compared with the traditional electronic expansion valve, the present invention reduces the number of parts and welding times of the electronic expansion valve while ensuring its functions, reduces the raw material cost, and improves the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic expansion valves, and particularly to an electronic expansion valve for a vehicle thermal management system. Background Art

[0002] Energy conservation and emission reduction are urgent problems to be solved by mankind today. The throttling device plays a key role in the refrigeration system. By selecting a suitable throttling mechanism to match the refrigeration system, the energy consumption of the entire refrigeration system can be reduced. The working principle of throttling is that when the refrigerant flows through the valve, the flow cross-section suddenly contracts, the fluid velocity increases, and the pressure drops, so as to achieve the functions of regulating the flow rate, controlling the superheat degree, and evaporating liquid level. Therefore, the regulation of the flow rate of the throttling mechanism plays a very important role in the energy conservation and consumption reduction of the refrigeration device. In some occasions with drastic load changes or a wide operating condition range, traditional throttling elements (such as capillary tubes, thermostatic expansion valves, etc.) can no longer meet the requirements in terms of comfort and energy conservation. The temperature sensing bulb of the thermostatic expansion valve has obvious delay characteristics and is difficult to quickly and effectively respond to the flow rate change in cooperation with the compressor displacement, ultimately leading to oscillation of the system regulation, causing unstable operation of the machine, and even damaging the compressor network. Therefore, the electronic expansion valve is gradually replacing the traditional throttling elements.

[0003] For example, a Chinese patent document with the publication number CN118110797A discloses an electronic expansion valve, which records that "it includes a valve needle assembly. The valve needle assembly includes a lead screw, a valve needle, a buffer spring, and a bearing. The valve needle includes a valve needle head and a valve needle sleeve, and the valve needle head and the valve needle sleeve are integrally formed. The lead screw has a first side portion facing the valve needle head and a second side portion facing away from the valve needle head. A part of the buffer spring is sleeved on the lead screw, a part of the buffer spring is sleeved on the bearing, one end of the buffer spring abuts against the first side portion of the lead screw, the other end of the buffer spring abuts against the bearing, and the buffer spring is located in the valve needle sleeve; the side of the valve needle sleeve away from the valve needle head has a contraction portion, at least part of the contraction portion is located above the second side portion of the lead screw, and the projection of at least part of the contraction portion along the axial direction of the lead screw towards the second side portion is located on the second side portion", and this electronic expansion valve is simple to assemble.

[0004] Another example is a Chinese patent document with the publication number CN118746166A, which discloses an electronic expansion valve, which records that "it includes a magnetic isolation tube; it also includes a driving mechanism, a guiding mechanism, a flow control mechanism, and a limiting mechanism. The flow control mechanism is installed on the driving mechanism, and the flow control mechanism is located in the guiding mechanism. The magnetic isolation tube is installed in the driving mechanism, and the limiting mechanism is installed in the flow control mechanism; the driving mechanism provides power for the flow control mechanism, the flow control mechanism cooperates with the guiding mechanism to adjust the flow rate, and the limiting mechanism limits the movement range of the flow control mechanism", and this electronic expansion valve controls the movement range of the flow control mechanism through the limiting mechanism, thereby improving the practicability of the device.

[0005] However, there are still the following defects or problems in combination with the existing technology: 1. In the existing related electronic expansion valves, the nut assemblies inside all contain a stop rod. The stop rod and the lead screw are both welded and fixed to the rotor insert as a whole. Two welding devices are required to separately weld the lead screw and the rotor insert, and the stop rod and the rotor insert. The equipment and production costs are high, and the production efficiency is low. 2. In the existing related electronic expansion valves, the valve core assembly has a complex structure. It is necessary to weld and fix the upper base of the spring to the lower end of the lead screw, then install the upper base of the spring into the valve core cavity, the cover is located above the conical surface of the upper base of the spring, and finally weld and fix the cover to the valve needle sleeve. Therefore, the valve core structure of the existing technology not only requires multiple weldings, but also has many installation components, and the assembly process is cumbersome, resulting in high production costs. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose an electronic expansion valve for a vehicle thermal management system.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An electronic expansion valve for a vehicle thermal management system, including a valve block. An output port is provided on one side of the valve block, an input port is provided on the other side of the valve block, an installation groove is provided on the upper surface of the valve block, the output port is communicated with the input port through the installation groove, a valve sleeve is placed in the installation groove of the valve block, a valve core structure is slidably sleeved inside the valve sleeve, and a return spring is sleeved outside the valve core structure;

[0009] The valve block is provided with internal threads at the installation groove, and the valve block is threadedly connected with a locking nut through the internal threads, and the locking nut and the valve sleeve are sleeved with each other;

[0010] The outer wall of the top of the valve sleeve is fixedly sleeved with a sealing sleeve, a rotor assembly is arranged inside the sealing sleeve, a nut assembly is arranged inside the rotor assembly, and a nut insert is fixedly sleeved at the bottom of the nut assembly;

[0011] The inner wall of the top of the valve sleeve is provided with a fixing groove, and the nut insert is press-fitted with the valve sleeve through the fixing groove.

[0012] Preferably, the valve core structure includes a valve needle sleeve, a buffer spring is placed inside the valve needle sleeve, the bottom of the valve needle sleeve is fixedly connected with a cover, the outer wall of the bottom of the valve needle sleeve and the outer wall of the cover are welded by circumferential seam, a valve needle assembly is slidably sleeved inside the cover, and the bottom of the buffer spring is in contact with the top of the valve needle assembly;

[0013] The top of the valve needle sleeve is provided with a breathing hole.

[0014] Preferably, a limiting ring is arranged on the outer side of the top of the valve needle sleeve. The limiting ring is integrally formed with the valve needle sleeve. The top end of the return spring contacts the lower surface of the limiting ring, and the bottom end of the return spring contacts the inner wall of the valve sleeve.

[0015] Preferably, the valve needle assembly includes a valve rod. The valve rod is slidably sleeved with the cover. A limiting block is fixedly connected to the top of the valve rod. A positioning protrusion is fixedly connected to the upper surface of the limiting block. The diameter of the limiting block is larger than that of the positioning protrusion. The valve rod, the limiting block, and the positioning protrusion are integrally formed. The limiting block and the positioning protrusion are both located inside the valve needle sleeve.

[0016] The limiting block is in clearance fit with the valve needle sleeve. The bottom end of the buffer spring contacts the upper surface of the limiting block. The positioning protrusion is sleeved with the buffer spring.

[0017] Preferably, a fixed convex ring is arranged on the upper surface of the cover. The cover is integrally formed with the fixed convex ring. The fixed convex ring is matched with the valve needle sleeve in size. The fixed convex ring is fixedly sleeved with the valve needle sleeve.

[0018] Preferably, the rotor assembly includes a magnetic rotor. A connecting ring is fixedly connected to the inner wall of the top of the magnetic rotor. A rotor insert is fixedly connected inside the connecting ring. The connecting ring is integrally formed with the rotor insert. A fixed card slot is arranged on the outer wall of the bottom of the rotor insert.

[0019] Preferably, the nut assembly includes a nut injection molding. A lead screw is threadedly connected inside the nut injection molding. The lead screw is fixedly sleeved with the rotor insert, and the top end of the lead screw is welded to the upper surface of the rotor insert in a circumferential seam. The bottom end of the lead screw contacts the upper surface of the valve needle sleeve.

[0020] A spring guide rail is sleeved on the outer wall of the nut injection molding. An upper stop is arranged at the top of the spring guide rail. The upper stop is an inverted L shape. A lower stop is arranged at the bottom of the spring guide rail. The spring guide rail, the upper stop, and the lower stop are integrally formed. The upper stop is clamped with the rotor insert through the fixed card slot.

[0021] A sliding ring is sleeved on the outer wall of the nut injection molding. The spring guide rail contacts the sliding ring. A limiting protrusion is arranged at the bottom end of the sliding ring. The sliding ring is integrally formed with the limiting protrusion. A limiting chute is arranged on the outer wall of the nut injection molding. The limiting protrusion extends into the limiting chute.

[0022] Preferably, a limiting convex ring is arranged on the outer wall of the bottom of the nut injection molding. The nut injection molding is integrally formed with the limiting convex ring. The spring guide rail and the sliding ring are both located above the limiting convex ring. The nut insert is fixedly sleeved on the outer wall of the limiting convex ring.

[0023] Preferably, a second sealing ring is sleeved on the outer wall of the middle part of the valve sleeve. A placement groove is provided at the installation groove of the valve block. The second sealing ring is matched with the placement groove, and the second sealing ring is located above the input port.

[0024] A first sealing ring is sleeved on the outer wall of the bottom of the valve sleeve. The first sealing ring is in contact with the inner wall of the valve block, and the first sealing ring is located between the output port and the input port.

[0025] Preferably, a locking groove is provided on the upper surface of the locking nut.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. In the present invention, through the design of the nut assembly and the rotor assembly, the rotor insert is connected to the upper stop at the spring guide rail. The limiting protrusion on the slip ring cooperates with the upper stop and the lower stop at the spring guide rail to limit the axial direction of the lead screw. The advantage of such a design is that on the premise of meeting the functional conditions of the stop structure of the electronic expansion valve, compared with the existing electronic expansion valve with a stop rod in the design, this design structure omits the stop rod and a welding process between the stop rod and the rotor insert, saving costs. At the same time, due to the omission of the stop rod, this stop structure can be assembled more simply and quickly, and the production efficiency is also improved.

[0028] 2. In the present invention, through the design of the valve core structure and the return spring, the valve core structure and the return spring cooperate with the nut assembly. The lead screw and the valve needle sleeve are improved to be in point contact. Compared with the traditional electronic expansion valve, the welding of the lead screw to the spring base in the original design is reduced, and the entire valve core structure only needs to be welded once. At the same time, the structures in this valve core structure are simple and compact. On the premise of ensuring its functions, not only the welding steps are reduced, but also the number of parts is optimized, saving costs and improving production efficiency.

[0029] In summary, compared with the traditional electronic expansion valve, the present invention reduces the number of parts and the number of welding times of the electronic expansion valve while ensuring its functions, reduces the raw material cost, and improves the production efficiency. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of an electronic expansion valve for a vehicle thermal management system of the present invention.

[0031] Figure 2 It is a side view of an electronic expansion valve for a vehicle thermal management system of the present invention.

[0032] Figure 3 It is an electronic expansion valve for a vehicle thermal management system of the present invention Figure 2 Cross-sectional view of A-A.

[0033] Figure 4 Schematic structural diagram of the valve block of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0034] Figure 5 Front view of the valve sleeve of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0035] Figure 6 An electronic expansion valve for a vehicle thermal management system according to the present invention Figure 5 Schematic structural diagram of the cross-sectional view taken along C-C.

[0036] Figure 7 Schematic structural diagram of the valve core structure of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0037] Figure 8 Axonometric view of the valve core structure of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0038] Figure 9 Schematic structural diagram of the valve needle assembly of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0039] Figure 10 Schematic structural diagram of the cover and fixed convex ring of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0040] Figure 11 Schematic structural diagram of the lock nut of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0041] Figure 12 Schematic structural diagram of the valve sleeve, first sealing ring, and second sealing ring of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0042] Figure 13 Schematic structural diagram of the rotor assembly of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0043] Figure 14 Schematic structural diagram of the rotor insert and connecting ring of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0044] Figure 15 Front view of the nut assembly of an electronic expansion valve for a vehicle thermal management system according to the present invention.

[0045] Figure 16 An electronic expansion valve for a vehicle thermal management system according to the present invention Figure 15 Cross-sectional view taken along B-B.

[0046] Figure 17Schematic diagram of the spring guide rail, upper stop, and lower stop of the electronic expansion valve of a vehicle thermal management system according to the present invention.

[0047] Figure 18 Schematic diagram of the lead screw and rotor insert of the electronic expansion valve of a vehicle thermal management system according to the present invention.

[0048] Reference numerals in the figure: 1, valve block; 101, output port; 102, input port; 103, installation groove; 104, internal thread; 105, placement groove;

[0049] 2, valve sleeve; 201, fixing groove; 3, locking nut; 301, locking groove;

[0050] 4, valve core structure; 401, valve needle sleeve; 402, breathing hole; 403, buffer spring; 404, cover; 4041, fixing convex ring; 405, valve needle assembly; 4051, valve rod; 4052, limit block; 4053, positioning protrusion; 406, limit ring;

[0051] 5, return spring; 6, nut insert;

[0052] 7, nut assembly; 701, nut injection molding; 702, lead screw; 703, limit sliding groove; 704, spring guide rail; 7041, upper stop; 7042, lower stop; 705, sliding ring; 7051, limit protrusion; 706, limit convex ring;

[0053] 8, rotor assembly; 801, magnetic rotor; 802, rotor insert; 803, connecting ring; 804, fixing card slot;

[0054] 9, sealing sleeve; 10, first sealing ring; 11, second sealing ring. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0056] As shown in the attached Figure 1 to the attached Figure 18 figures:

[0057] An electronic expansion valve for a vehicle thermal management system includes a valve block 1. An output port 101 is provided on one side of the valve block 1, an input port 102 is provided on the other side of the valve block 1, an installation groove 103 is provided on the upper surface of the valve block 1. The output port 101 is communicated with the input port 102 through the installation groove 103. A valve sleeve 2 is placed in the installation groove 103 of the valve block 1. A valve core structure 4 is slidably sleeved inside the valve sleeve 2, and a return spring 5 is sleeved outside the valve core structure 4;

[0058] The valve block 1 is provided with an internal thread 104 at the installation groove 103. The valve block 1 is threadedly connected with a lock nut 3 through the internal thread 104, and the lock nut 3 and the valve sleeve 2 are sleeved with each other; a sealing sleeve 9 is fixedly sleeved on the outer wall of the top of the valve sleeve 2, a rotor assembly 8 is arranged inside the sealing sleeve 9, a nut assembly 7 is arranged inside the rotor assembly 8, and a nut insert 6 is fixedly sleeved at the bottom of the nut assembly 7; a fixing groove 201 is opened on the inner wall of the top of the valve sleeve 2, and the nut insert 6 is in interference fit with the valve sleeve 2 through the fixing groove 201.

[0059] The valve core structure 4 includes a valve needle sleeve 401. A buffer spring 403 is placed inside the valve needle sleeve 401. The buffer spring 403 is located inside the valve needle sleeve 401. The main function of the buffer spring 403 is to prevent the valve needle assembly 405 from causing hard impact on the valve port at the bottom of the valve sleeve 2, resulting in damage to the valve port, and the pre-tightening force when the valve port is closed is controllable; a cover 404 is fixedly connected to the bottom of the valve needle sleeve 401. The outer wall of the bottom of the valve needle sleeve 401 and the outer wall of the cover 404 are circumferentially welded. A valve needle assembly 405 is slidably sleeved inside the cover 404, and the bottom of the buffer spring 403 is in contact with the top of the valve needle assembly 405;

[0060] In the above technical solution, the lead screw 702 generates a downward acting force, and the downward acting force directly acts on the upper surface of the valve needle sleeve 401. The return spring 5 is compressed. The valve needle sleeve 401 overcomes the return spring force of the return spring 5, so that the valve needle sleeve 401 moves downward following the lead screw 702. The valve needle sleeve 401 drives the valve needle assembly 405 to move downward. When the conical surface at the bottom of the valve needle assembly 405 makes mechanical contact with the valve port at the bottom of the valve sleeve 2, the valve port at the bottom of the valve sleeve 2 is closed;

[0061] At this time, when the valve needle sleeve 401 continues to move downward under the action of the lead screw 702, the buffer spring 403 inside the valve needle sleeve 401 is further compressed. The buffer spring 403 exerts a certain spring force on the valve needle assembly 405, so that the sealing effect of the valve port at the bottom of the valve sleeve 2 is further enhanced;

[0062] When the lead screw 702 moves upward, the valve needle sleeve 401 is reset under the return spring force of the return spring 5. The return spring 5 drives the valve needle sleeve 401 to move upward following the lead screw 702. The valve needle sleeve 401 drives the valve needle assembly 405 to move upward. The valve needle assembly 405 is not in contact with the valve sleeve 2. At this time, the valve port at the bottom of the valve sleeve 2 is opened. At this time, the fluid enters the inner valve sleeve 2 through the input port 102 and is discharged through the output port 101.

[0063] A breathing hole 402 is opened at the top of the valve needle sleeve 401. The breathing hole 402 is used to balance the pressure inside the cavity of the valve needle sleeve 401 and the external pressure.

[0064] A limiting ring 406 is provided on the outer side of the top of the valve needle sleeve 401. The limiting ring 406 is integrally formed with the valve needle sleeve 401. The top end of the return spring 5 is in contact with the lower surface of the limiting ring 406, and the bottom end of the return spring 5 is in contact with the inner wall of the valve sleeve 2.

[0065] In the above technical solution, through the cooperation of the limiting ring 406 and the return spring 5, when the nut injection molding 701 moves axially, the valve needle sleeve 401 moves following the nut injection molding 701 under the action of the return spring 5, and the return spring 5 is used for the reset of the valve needle sleeve 401.

[0066] The valve needle assembly 405 includes a valve rod 4051. The valve rod 4051 is slidably sleeved with the cover 404. A limiting block 4052 is fixedly connected to the top of the valve rod 4051. A positioning protrusion 4053 is fixedly connected to the upper surface of the limiting block 4052. The diameter dimension of the limiting block 4052 is larger than the diameter dimension of the positioning protrusion 4053. The valve rod 4051, the limiting block 4052, and the positioning protrusion 4053 are integrally formed. The limiting block 4052 and the positioning protrusion 4053 are both located inside the valve needle sleeve 401;

[0067] The limiting block 4052 is in clearance fit with the valve needle sleeve 401. The bottom end of the buffer spring 403 is in contact with the upper surface of the limiting block 4052, and the positioning protrusion 4053 is sleeved with the buffer spring 403.

[0068] In the above technical solution, through the design of the limiting block 4052, the limiting block 4052 is in clearance fit with the valve needle sleeve 401. When the valve rod 4051 moves up and down, the limiting block 4052 realizes the guiding function for the valve rod 4051; the positioning protrusion 4053 is sleeved with the buffer spring 403 for positioning the installation of the buffer spring 403.

[0069] The upper surface of the cover 404 is provided with a fixed convex ring 4041. The cover 404 is integrally formed with the fixed convex ring 4041. The fixed convex ring 4041 matches the size of the valve needle sleeve 401, and the fixed convex ring 4041 is fixedly sleeved with the valve needle sleeve 401.

[0070] In the above technical solution, the fixed convex ring 4041 on the upper surface of the cover 404 is in interference fit with the valve needle sleeve 401. The main function of the cover 404 is to guide and radially limit the valve needle assembly 405. The outer side wall of the cover 404 is welded to the bottom outer wall of the valve needle sleeve 401 by circumferential seam welding.

[0071] The rotor assembly 8 includes a magnetic rotor 801. A connecting ring 803 is fixedly connected to the inner wall of the top of the magnetic rotor 801. A rotor insert 802 is fixedly connected inside the connecting ring 803. The connecting ring 803 and the rotor insert 802 are integrally formed. A fixing card slot 804 is formed on the outer wall of the bottom of the rotor insert 802; The nut assembly 7 includes a nut injection molding 701. A lead screw 702 is threadedly connected inside the nut injection molding 701. The lead screw 702 is fixedly sleeved with the rotor insert 802, and the top end of the lead screw 702 is circumferentially welded to the upper surface of the rotor insert 802. The bottom end of the lead screw 702 is in contact with the upper surface of the valve needle sleeve 401;

[0072] A spring guide 704 is sleeved on the outer wall of the nut injection molding 701. An upper stop 7041 is arranged at the top of the spring guide 704. The upper stop 7041 is an inverted L shape. A lower stop 7042 is arranged at the bottom of the spring guide 704. The spring guide 704, the upper stop 7041 and the lower stop 7042 are integrally formed. The upper stop 7041 is clamped with the rotor insert 802 through the fixing card slot 804. Through the design of the fixing card slot 804 and the upper stop 7041, the upper stop 7041 is clamped into the fixing card slot 804. When the rotor insert 802 rotates, it can drive the spring guide 704 to rotate. When the rotor insert 802 moves axially, it can drive the spring guide 704 to move axially;

[0073] A slip ring 705 is sleeved on the outer wall of the nut injection molding 701. The spring guide 704 is in contact with the slip ring 705. A limit protrusion 7051 is arranged at the bottom end of the slip ring 705. The slip ring 705 and the limit protrusion 7051 are integrally formed. A limit chute 703 is formed on the outer wall of the nut injection molding 701. The limit protrusion 7051 extends into the limit chute 703.

[0074] In the above technical solution, when the rotor assembly 8 rotates counterclockwise under the action of electromagnetic force, the rotor assembly 8 drives the lead screw 702 to rotate, and the lead screw 702 descends. The rotor insert 802 drives the spring guide 704 to rotate counterclockwise through the fixing card slot 804. Since the limit protrusion 7051 of the slip ring 705 is inserted into the limit chute 703, the limit chute 703 on the outer wall of the nut injection molding 701 restricts the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will move axially along the direction of the limit chute 703 and the spring guide 704. The slip ring 705 descends. When the limit protrusion 7051 at the slip ring 705 moves to the lower stop 7042, the limit protrusion 7051 is blocked and limited by the lower stop 7042, and the axial movement terminates;

[0075] When the rotor assembly 8 rotates clockwise under the action of electromagnetic force, the rotor assembly 8 drives the lead screw 702 to rotate, and the lead screw 702 rises. The rotor insert 802 drives the spring guide 704 to rotate clockwise through the fixed card slot 804. Since the limit protrusion 7051 of the slip ring 705 is inserted into the limit chute 703, the limit chute 703 on the outer wall of the nut injection molding 701 restricts the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will perform axial movement along the direction of the limit chute 703 and the spring guide 704. The slip ring 705 rises. When the limit protrusion 7051 at the slip ring 705 moves to the bottom of the upper stop 7041, the limit protrusion 7051 is blocked and limited by the upper stop 7041, and the axial movement terminates.

[0076] A limit convex ring 706 is provided on the bottom outer wall of the nut injection molding 701. The nut injection molding 701 and the limit convex ring 706 are integrally formed. Both the spring guide 704 and the slip ring 705 are located above the limit convex ring 706. The nut insert 6 is fixedly sleeved on the outer wall of the limit convex ring 706.

[0077] A second sealing ring 11 is sleeved on the middle outer wall of the valve sleeve 2. The valve block 1 is provided with a placement groove 105 at the installation groove 103. The second sealing ring 11 is matched with the placement groove 105, and the second sealing ring 11 is located above the input port 102. A first sealing ring 10 is sleeved on the bottom outer wall of the valve sleeve 2. The first sealing ring 10 is in contact with the inner wall of the valve block 1, and the first sealing ring 10 is located between the output port 101 and the input port 102.

[0078] In the above technical solution, through the design of the first sealing ring 10 and the second sealing ring 11, the sealing performance of the electronic expansion valve is improved.

[0079] A locking groove 301 is provided on the upper surface of the locking nut 3.

[0080] In the above technical solution, through the design of the locking groove 301, the locking nut 3 is sleeved outside the valve sleeve 2. When the locking nut 3 is screwed into the internal thread 104, an auxiliary tool is inserted into the locking groove 301, so as to conveniently apply a certain torque to the locking nut 3 to lock and fix the valve sleeve 2 and the valve block 1.

[0081] The specific usage mode and function of this embodiment:

[0082] When the present invention is in use, when the rotor assembly 8 rotates counterclockwise under the action of electromagnetic force, the rotor assembly 8 drives the lead screw 702 to rotate, and the lead screw 702 descends. The rotor insert 802 drives the spring guide 704 to rotate counterclockwise through the fixed card slot 804. Since the limit protrusion 7051 of the slip ring 705 is inserted into the limit chute 703, the limit chute 703 on the outer wall of the nut injection molding 701 restricts the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will perform axial movement along the direction of the limit chute 703 and the spring guide 704. The slip ring 705 descends. When the limit protrusion 7051 at the slip ring 705 moves to the lower stop 7042, the limit protrusion 7051 is blocked and limited by the lower stop 7042, and the axial movement terminates;

[0083] For the above structure and process, please refer to Figure 1 and Figures 13 - 18 .

[0084] The lead screw 702 generates a downward acting force, which directly acts on the upper surface of the valve needle sleeve 401. The return spring 5 is compressed. The valve needle sleeve 401 overcomes the return spring force of the return spring 5, causing the valve needle sleeve 401 to move downward following the lead screw 702. The valve needle sleeve 401 drives the valve needle assembly 405 to move downward. When the conical surface at the bottom of the valve needle assembly 405 makes mechanical contact with the valve port at the bottom of the valve sleeve 2, the valve port at the bottom of the valve sleeve 2 closes;

[0085] At this time, when the valve needle sleeve 401 continues to move downward under the action of the lead screw 702, the buffer spring 403 inside the valve needle sleeve 401 is further compressed. The buffer spring 403 exerts a certain spring force on the valve needle assembly 405, further strengthening the sealing effect of the valve port at the bottom of the valve sleeve 2;

[0086] For the above structure and process, please refer to Figures 1 - 18 .

[0087] When the rotor assembly 8 rotates clockwise under the action of electromagnetic force, the rotor assembly 8 drives the lead screw 702 to rotate, and the lead screw 702 rises. The rotor insert 802 drives the spring guide 704 to rotate clockwise through the fixed card slot 804. Since the limit protrusion 7051 of the slip ring 705 is inserted into the limit chute 703, the limit chute 703 on the outer wall of the nut injection molding 701 restricts the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will perform axial movement along the direction of the limit chute 703 and the spring guide 704. The slip ring 705 rises. When the limit protrusion 7051 at the slip ring 705 moves to the bottom of the upper stop 7041, the limit protrusion 7051 is blocked and limited by the upper stop 7041, and the axial movement terminates;

[0088] Through the design of the nut assembly 7 and the rotor assembly 8, the rotor insert 802 is connected to the upper stopper 7041 at the spring guide 704. The limit protrusion 7051 on the slip ring 705 cooperates with the upper stopper 7041 and the lower stopper 7042 at the spring guide 704 to limit the axial direction of the lead screw 702. The advantage of such a design is that on the premise of meeting the functional conditions of the stop structure of the electronic expansion valve, compared with the existing electronic expansion valve with a stop rod, this design structure eliminates the stop rod and a welding process between the stop rod and the rotor insert 802, saving costs. At the same time, due to the elimination of the stop rod, this stop structure can be assembled more simply and quickly, and the production efficiency is also improved.

[0089] Please refer to the above structure and process Figure 1 and Figures 13 - 18 。

[0090] When the lead screw 702 moves upward, the valve needle sleeve 401 is reset under the reset spring force of the reset spring 5. The reset spring 5 drives the valve needle sleeve 401 to move upward following the lead screw 702. The valve needle sleeve 401 drives the valve needle assembly 405 to move upward. The valve needle assembly 405 does not contact the valve sleeve 2. At this time, the valve port at the bottom of the valve sleeve 2 is opened, and the fluid enters the inner valve sleeve 2 through the input port 102 and is discharged through the output port 101.

[0091] Through the design of the valve core structure 4 and the reset spring 5, the valve core structure 4 and the reset spring 5 cooperate with the nut assembly 7. The lead screw 702 and the valve needle sleeve 401 are improved to be in point contact. Compared with the traditional electronic expansion valve, the welding of the lead screw 702 to the spring base in the original design is reduced, and the entire valve core structure 4 only needs to be welded once. At the same time, the structures in the valve core structure 4 are simple and compact. On the premise of ensuring its function, not only the welding steps are reduced, but also the number of parts is optimized, saving costs and improving production efficiency.

[0092] Please refer to the above structure and process Figures 1 - 18 。

[0093] During the assembly of the present invention:

[0094] S1. Install the buffer spring 403 into the valve needle sleeve 401, install the valve needle assembly 405 into the valve needle sleeve 401, and the valve needle assembly 405 contacts the buffer spring 403. Press the cover 404 into the bottom of the valve needle sleeve 401, and perform circumferential welding on the connection between the cover 404 and the valve needle sleeve 401 to complete the assembly of the valve core structure 4.

[0095] S2. Sleeve the reset spring 5 with the valve needle sleeve 401. After the reset spring 5 is installed in the valve needle sleeve 401, install the valve core structure 4 into the valve sleeve 2.

[0096] S3. Screw the lead screw 702 into the nut injection molding part 701. The spring guide rail 704 and the slip ring 705 are sleeved outside the nut injection molding part 701. The left side of the limit projection 7051 at the slip ring 705 is in contact with the right side of the lower stop 7042 at the spring guide rail 704 to complete the assembly of the nut assembly 7.

[0097] S4. Press the nut insert 6 into the valve sleeve 2 that has been assembled above by interference fit, and press the nut insert 6 to mechanical limit.

[0098] S6. Fix and weld the rotor insert 802 and the top end of the lead screw 702 by sleeve fitting and using a welding device, and then rotate the lead screw 702 to an appropriate position so that the spring guide rail 704 is snapped into the fixed card slot 804.

[0099] S9. Press the sealing sleeve 9 into the outer wall of the valve sleeve 2 by interference fit to mechanical limit, and then perform circumferential welding and fixing at the connection between the sealing sleeve 9 and the valve sleeve 2.

[0100] S7. Fit the second sealing ring 11 and the first sealing ring 10 onto the outside of the valve sleeve 2, and install the assembled valve sleeve 2 into the valve block 1.

[0101] S8. Sleeve the locking nut 3 outside the valve sleeve 2, screw the locking nut 3 into the internal thread 104, and apply a certain torque to the locking nut 3 to lock and fix the valve sleeve 2 and the valve block 1.

[0102] For the above structure and process, please refer to Figures 1 - 18 .

[0103] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An electronic expansion valve for a vehicle thermal management system, comprising a valve block (1), characterized in that: An output port (101) is provided on one side of the valve block (1), and an input port (102) is provided on the other side of the valve block (1); a mounting groove (103) is provided on the upper surface of the valve block (1); the output port (101) is connected to the input port (102) via the mounting groove (103); a valve sleeve (2) is placed in the mounting groove (103) of the valve block (1); a valve core structure (4) is slidably sleeved inside the valve sleeve (2); and a return spring (5) is sleeved on the outer side of the valve core structure (4); The valve block (1) is provided with an internal thread (104) at the mounting groove (103), the valve block (1) is threadedly connected to a locking nut (3) via the internal thread (104), and the locking nut (3) and the valve sleeve (2) are sleeved with each other; A sealing sleeve (9) is fixedly sleeved on the top outer wall of the valve sleeve (2), a rotor assembly (8) is arranged inside the sealing sleeve (9), a nut assembly (7) is arranged inside the rotor assembly (8), and a nut insert (6) is fixedly sleeved on the bottom of the nut assembly (7); A fixing groove (201) is provided on the top inner wall of the valve sleeve (2), and the nut insert (6) is interference-fitted with the valve sleeve (2) through the fixing groove (201); The rotor assembly (8) comprises a magnetic rotor (801), a connecting ring (803) being fixedly connected to the top inner wall of the magnetic rotor (801), a rotor insert (802) being fixedly connected inside the connecting ring (803), the connecting ring (803) and the rotor insert (802) being integrally formed, and a fixing slot (804) being provided on the bottom outer wall of the rotor insert (802); The nut assembly (7) comprises a nut injection molded part (701), the internal thread of the nut injection molded part (701) is connected to a screw rod (702), the screw rod (702) is fixedly sleeved with a rotor insert (802), and the top end of the screw rod (702) is annularly welded to the upper surface of the rotor insert (802), and the bottom end of the screw rod (702) is in contact with the upper surface of the valve needle sleeve (401); The outer wall of the nut injection molded part (701) is sleeved with a spring guide rail (704); an upper stopper (7041) is arranged at the top of the spring guide rail (704); the upper stopper (7041) is in an inverted L shape; a lower stopper (7042) is arranged at the bottom of the spring guide rail (704); the spring guide rail (704), the upper stopper (7041) and the lower stopper (7042) are integrally formed; and the upper stopper (7041) is mutually clamped with the rotor insert (802) via a fixed clamping groove (804); The outer wall of the nut injection molded part (701) is sleeved with a slip ring (705), the spring guide rail (704) is in contact with the slip ring (705), a limiting protrusion (7051) is provided at the bottom end of the slip ring (705), the slip ring (705) and the limiting protrusion (7051) are integrally formed, and the outer wall of the nut injection molded part (701) is provided with a limiting slide groove (703), and the limiting protrusion (7051) extends into the limiting slide groove (703).

2. The electronic expansion valve for a vehicle thermal management system according to claim 1, characterized in that: The valve core structure (4) comprises a valve needle sleeve (401), a buffer spring (403) is placed inside the valve needle sleeve (401), a cover (404) is fixedly connected to the bottom of the valve needle sleeve (401), the bottom outer wall of the valve needle sleeve (401) is annularly welded to the outer wall of the cover (404), a valve needle assembly (405) is slidably sleeved inside the cover (404), and the bottom of the buffer spring (403) is in contact with the top of the valve needle assembly (405); A breathing hole (402) is provided on the top of the valve needle sleeve (401).

3. The electronic expansion valve for a vehicle thermal management system according to claim 2, characterized in that: A limiting ring (406) is arranged on the outer side of the top of the valve needle sleeve (401), and the limiting ring (406) is integrally formed with the valve needle sleeve (401). The top end of the return spring (5) contacts the lower surface of the limiting ring (406), and the bottom end of the return spring (5) contacts the inner wall of the valve sleeve (2).

4. The electronic expansion valve for a vehicle thermal management system according to claim 2, characterized in that: The valve needle assembly (405) comprises a valve stem (4051), the valve stem (4051) is slidably sleeved with the cover (404), the top of the valve stem (4051) is fixedly connected to a limit block (4052), the upper surface of the limit block (4052) is fixedly connected to a positioning protrusion (4053), the diameter of the limit block (4052) is larger than the diameter of the positioning protrusion (4053), the valve stem (4051), the limit block (4052) and the positioning protrusion (4053) are integrally formed, and the limit block (4052) and the positioning protrusion (4053) are both located inside the valve needle sleeve (401); The limit block (4052) is loosely matched with the valve needle sleeve (401), the bottom end of the buffer spring (403) is in contact with the upper surface of the limit block (4052), and the positioning protrusion (4053) and the buffer spring (403) are sleeved with each other.

5. The electronic expansion valve for a vehicle thermal management system according to claim 2, characterized in that: A fixing convex ring (4041) is provided on the upper surface of the sealing cover (404); the sealing cover (404) and the fixing convex ring (4041) are integrally formed; the fixing convex ring (4041) matches the size of the valve needle sleeve (401); and the fixing convex ring (4041) is fixedly sleeved with the valve needle sleeve (401).

6. The electronic expansion valve for a vehicle thermal management system according to claim 1, characterized in that: A limiting convex ring (706) is provided on the bottom outer wall of the nut injection molded part (701); the nut injection molded part (701) and the limiting convex ring (706) are integrally formed; the spring guide rail (704) and the sliding ring (705) are both located above the limiting convex ring (706); and the nut insert (6) is fixedly sleeved on the outer wall of the limiting convex ring (706).

7. The electronic expansion valve for a vehicle thermal management system according to claim 1, characterized in that: A second sealing ring (11) is sleeved on the middle outer wall of the valve sleeve (2); a placement groove (105) is provided on the valve block (1) at the installation groove (103); the second sealing ring (11) matches the placement groove (105); and the second sealing ring (11) is located above the input port (102); A first sealing ring (10) is sleeved on the outer wall of the bottom of the valve sleeve (2); the first sealing ring (10) is in contact with the inner wall of the valve block (1); the first sealing ring (10) is located between the output port (101) and the input port (102).

8. The electronic expansion valve for a vehicle thermal management system according to claim 1, characterized in that: The upper surface of the locking nut (3) is provided with a locking groove (301).

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