An electronic expansion valve for a thermal management system for a vehicle

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, and comprises a valve block, wherein one side of the valve block is provided with an output port, the other side of the valve block is provided with an input port, an upper surface of the valve block is provided with a mounting groove, the output port is communicated with the input port through the mounting groove, a valve sleeve is placed in the mounting groove of the valve block, a valve core structure is slidably sleeved inside the valve sleeve, and a return spring is sleeved on the outer side of the valve core structure; an internal thread is provided at the mounting groove of the valve block, a locking nut is threadedly connected to the valve block through the internal thread, and the locking nut and the valve sleeve are sleeved with each other; a sealing sleeve is fixedly sleeved on the top outer wall 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 electronic expansion valve parts and the number of welding times while ensuring its function, reduces the cost of raw materials, and improves production efficiency.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are urgent problems that humans need to solve 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 shrinks, the fluid flow rate accelerates, and the pressure drops, thereby achieving the function of regulating the flow, controlling the superheat and the evaporation liquid level. Therefore, the regulation of the flow of the throttling mechanism plays a very important role in energy conservation and consumption reduction of refrigeration equipment. In some occasions where the load changes drastically or the operating conditions are wide, traditional throttling elements (such as capillaries, thermal expansion valves, etc.) can no longer meet the requirements of comfort and energy saving. The temperature sensing package of the thermal expansion valve has obvious delay characteristics, which makes it difficult to respond quickly and effectively to the flow change in coordination with the compressor displacement, which ultimately leads to oscillation of the system regulation, causing unstable operation of the machine and even damage to the compressor network. Therefore, electronic expansion valves are gradually replacing traditional throttling elements.

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

[0004] For another example, an electronic expansion valve is disclosed in the Chinese patent document with publication number CN118746166A, which records that "it includes a magnetic isolation tube; it also includes a driving mechanism, a guide 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 guide 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 guide mechanism to adjust the flow, and the limiting mechanism limits the flow control mechanism". The electronic expansion valve controls the moving range of the flow control mechanism through the limiting mechanism, thereby improving the practicability of the equipment.

[0005] However, the following defects or problems still exist in combination with the prior art: 1. The nut assembly inside the existing related electronic expansion valve contains a stop rod, and the stop rod and the screw rod are welded and fixed to the rotor insert as a whole. Two welding equipment are required to weld the screw rod and the rotor insert respectively. The welding of the stop rod and the rotor insert has high equipment and production costs and low production efficiency; 2. The valve core assembly structure of the existing related electronic expansion valve is complicated. The upper spring base and the lower end of the screw rod need to be fixed by welding, and then the upper spring base is installed into the valve core cavity. The cover is located above the conical surface of the upper spring base, and finally the cover is welded and fixed to the valve needle sleeve. Therefore, the valve core structure of the electronic expansion valve in the prior art not only requires multiple welding, but also has many installation parts, and the assembly process is cumbersome, which makes the production cost high. Summary of the invention

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

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: An electronic expansion valve for a thermal management system for a vehicle, comprising 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, a mounting groove is provided on the upper surface of the valve block, the output port is connected to the input port through the mounting groove, a valve sleeve is placed in the mounting groove of the valve block, a valve core structure is slidably sleeved inside the valve sleeve, and a return spring is sleeved on the outer side of the valve core structure; The valve block is provided with an internal thread at the installation groove, the valve block is threadedly connected with a locking nut through the internal thread, and the locking nut and the valve sleeve are sleeved with each other; A sealing sleeve is fixedly sleeved on the top outer wall of the valve 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 on the bottom of the nut assembly; A fixing groove is provided on the top inner wall of the valve sleeve, and the nut insert is interference fitted with the valve sleeve through the fixing groove.

[0008] Preferably, the valve core structure comprises a valve needle sleeve, a buffer spring is placed inside the valve needle sleeve, a sealing cover is fixedly connected to the bottom of the valve needle sleeve, the bottom outer wall of the valve needle sleeve is annularly welded to the outer wall of the sealing cover, a valve needle assembly is slidably sleeved inside the sealing cover, and the bottom of the buffer spring is in contact with the top of the valve needle assembly; A breathing hole is provided on the top of the valve needle sleeve.

[0009] Preferably, a limiting ring is provided on the outer side of the top of the valve needle sleeve, and 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.

[0010] Preferably, the valve needle assembly comprises a valve stem, the valve stem is slidably sleeved with the sealing cover, the top of the valve stem is fixedly connected to a limit block, the upper surface of the limit block is fixedly connected to a positioning protrusion, the diameter of the limit block is larger than the diameter of the positioning protrusion, the valve stem, the limit block and the positioning protrusion are integrally formed, and the limit block and the positioning protrusion are both located inside the valve needle sleeve; The limit block is in clearance fit with the valve needle sleeve, the bottom end of the buffer spring is in contact with the upper surface of the limit block, and the positioning protrusion and the buffer spring are sleeved with each other.

[0011] Preferably, a fixing convex ring is provided on the upper surface of the cover, the cover and the fixing convex ring are integrally formed, the size of the fixing convex ring matches that of the valve needle sleeve, and the fixing convex ring is fixedly sleeved with the valve needle sleeve.

[0012] Preferably, the rotor assembly includes a magnetic rotor, a connecting ring is fixedly connected to the top inner wall of the magnetic rotor, a rotor insert is fixedly connected inside the connecting ring, the connecting ring and the rotor insert are integrally formed, and a fixing groove is opened on the bottom outer wall of the rotor insert.

[0013] Preferably, the nut assembly comprises a nut injection molded part, the internal thread of the nut injection molded part is connected with a screw rod, the screw rod is fixedly sleeved with the rotor insert, and the top end of the screw rod is annularly welded with the upper surface of the rotor insert, and the bottom end of the screw rod is in contact with the upper surface of the valve needle sleeve; The outer wall of the nut injection molded part is sleeved with a spring guide rail, an upper stopper is arranged on the top of the spring guide rail, the upper stopper is in an inverted L shape, and a lower stopper is arranged at the bottom of the spring guide rail. The spring guide rail, the upper stopper and the lower stopper are integrally formed, and the upper stopper is mutually clamped with the rotor insert through a fixed clamping groove; The outer wall of the nut injection molded part is sleeved with a slip ring, the spring guide rail is in contact with the slip ring, a limiting protrusion is arranged at the bottom end of the slip ring, the slip ring and the limiting protrusion are integrally formed, a limiting slide groove is provided on the outer wall of the nut injection molded part, and the limiting protrusion extends into the limiting slide groove.

[0014] Preferably, a limiting convex ring is provided on the bottom outer wall of the nut injection molded part, the nut injection molded part and the limiting convex ring are integrally formed, the spring guide rail and the sliding ring are both located above the limiting convex ring, and the nut insert is fixedly sleeved on the outer wall of the limiting convex ring.

[0015] Preferably, a second sealing ring is sleeved on the middle outer wall of the valve sleeve, a placement groove is provided on the valve block at the installation groove, the second sealing ring matches the placement groove, and the second sealing ring is located above the input port; A first sealing ring is sleeved on the outer wall of the bottom of the valve sleeve. The first sealing ring contacts the inner wall of the valve block. The first sealing ring is located between the output port and the input port.

[0016] Preferably, a locking groove is provided on the upper surface of the locking nut.

[0017] The beneficial effects of the present invention are: 1. In the present invention, the rotor insert is connected to the upper stopper at the spring guide rail through the design of the nut assembly and the rotor assembly, and the limiting protrusion on the slip ring cooperates with the upper stopper and the lower stopper at the spring guide rail to limit the axial position of the lead screw; the advantage of such a design is that, under the premise of meeting the functional conditions of the electronic expansion valve stop structure, compared with the electronic expansion valve with a stopper rod in the existing design, the design structure omits the stopper rod and a welding process between the stopper rod and the rotor insert, thereby saving costs; at the same time, due to the omission of the stopper rod, the stopper structure can be assembled more simply and quickly, and the production efficiency is also improved.

[0018] 2. In the present invention, through the design of the valve core structure and the reset spring, the valve core structure and the reset spring cooperate with the nut assembly to work, and the screw rod and the valve needle sleeve are improved to point contact. Compared with the traditional electronic expansion valve, the need to weld the screw rod and 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, each structure in the valve core structure is simple and compact. Under the premise of ensuring its function, it not only reduces the welding steps, but also optimizes the number of parts, saves costs and improves production efficiency.

[0019] In summary, compared with the traditional electronic expansion valve, the present invention reduces the number of electronic expansion valve parts and welding times while ensuring its functions, reduces the cost of raw materials, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic structural diagram of an electronic expansion valve for a vehicle thermal management system.

[0021] Figure 2 The figure is a side view of an electronic expansion valve of a vehicle thermal management system according to the present invention.

[0022] Figure 3 The electronic expansion valve of a vehicle thermal management system of the present invention is Figure 2 Cross-sectional view of AA.

[0023] Figure 4 The present invention is a schematic structural diagram of a valve block of an electronic expansion valve for a vehicle thermal management system.

[0024] Figure 5 The present invention is a front view of a valve sleeve of an electronic expansion valve for a vehicle thermal management system.

[0025] Figure 6 The electronic expansion valve of the vehicle thermal management system of the present invention is Figure 5 Schematic diagram of the cross-sectional structure of CC.

[0026] Figure 7 The present invention is a schematic structural diagram of a valve core structure of an electronic expansion valve for a vehicle thermal management system.

[0027] Figure 8 The isometric view of the valve core structure of an electronic expansion valve of a vehicle thermal management system according to the present invention.

[0028] Fig. 9 The present invention is a schematic structural diagram of a valve needle assembly of an electronic expansion valve for a vehicle thermal management system.

[0029] Fig.10 The present invention is a schematic structural diagram of a sealing cover and a fixing convex ring of an electronic expansion valve for a vehicle thermal management system.

[0030] Fig.11 The present invention is a schematic structural diagram of a locking nut of an electronic expansion valve for a vehicle thermal management system.

[0031] Fig.12 The present invention is a schematic structural diagram of a valve sleeve, a first sealing ring, and a second sealing ring of an electronic expansion valve for a vehicle thermal management system.

[0032] Fig.13 The present invention is a schematic structural diagram of a rotor assembly of an electronic expansion valve for a vehicle thermal management system.

[0033] Fig.14 The present invention is a schematic structural diagram of a rotor insert and a connecting ring of an electronic expansion valve for a vehicle thermal management system.

[0034] Fig.15 The present invention is a front view of a nut assembly of an electronic expansion valve for a vehicle thermal management system.

[0035] Fig.16 The electronic expansion valve of a vehicle thermal management system of the present invention is Fig.15 Cross-section of BB.

[0036] Fig.17 The present invention is a schematic structural diagram of a spring guide rail, an upper stopper, and a lower stopper of an electronic expansion valve for a vehicle thermal management system.

[0037] Fig.18 The present invention is a schematic structural diagram of a lead screw and a rotor insert of an electronic expansion valve for a vehicle thermal management system.

[0038] Numbers in the figure: 1, valve block; 101, output port; 102, input port; 103, installation groove; 104, internal thread; 105, placement groove; 2. Valve sleeve; 201. Fixing groove; 3. Locking nut; 301. Locking groove; 4. Valve core structure; 401. Valve needle sleeve; 402. Breathing hole; 403. Buffer spring; 404. Cover; 4041. Fixed convex ring; 405. Valve needle assembly; 4051. Valve stem; 4052. Limit block; 4053. Positioning protrusion; 406. Limit ring; 5. Reset spring; 6. Nut insert; 7. Nut assembly; 701. Nut injection molding; 702. Screw rod; 703. Limiting slide groove; 704. Spring guide rail; 7041. Upper stopper; 7042. Lower stopper; 705. Slip ring; 7051. Limiting protrusion; 706. Limiting protrusion ring; 8. Rotor assembly; 801. Magnetic rotor; 802. Rotor insert; 803. Connecting ring; 804. Fixed slot; 9. Sealing sleeve; 10. First sealing ring; 11. Second sealing ring. DETAILED DESCRIPTION

[0039] 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.

[0040] As attached Figure 1 To Attachment Fig.18 As shown: An electronic expansion valve for a thermal management system for a vehicle 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, 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 through 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 installation groove 103, and the valve block 1 is threadedly connected with a locking nut 3 through 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.

[0041] The valve core structure 4 includes a valve needle sleeve 401, and 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 function of the buffer spring 403 is mainly to prevent the valve needle assembly 405 from having a hard impact on the valve port at the bottom of the valve sleeve 2, causing damage to the valve port, and to control the preload force when the valve port is closed; the bottom of the valve needle sleeve 401 is fixedly connected with a cover 404, the bottom outer wall of the valve needle sleeve 401 is annularly welded with the outer wall of the cover 404, the inner sliding sleeve of the cover 404 is connected with the valve needle assembly 405, and the bottom of the buffer spring 403 is in contact with the top of the valve needle assembly 405; In the above technical solution, the screw rod 702 generates a downward force, which directly acts on the upper surface of the valve needle sleeve 401, and the reset spring 5 is squeezed. The valve needle sleeve 401 overcomes the reset spring force of the reset spring 5 so that the valve needle sleeve 401 moves downward with the screw rod 702, and 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 is in 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. At this time, when the valve needle sleeve 401 continues to move downward under the action of the screw rod 702, the buffer spring 403 inside the valve needle sleeve 401 is further compressed, and the buffer spring 403 applies a certain spring force to the valve needle assembly 405, so that the valve port sealing effect at the bottom of the valve sleeve 2 is further enhanced; When the screw rod 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 along with the screw rod 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.

[0042] A breathing hole 402 is provided on the top of the valve needle sleeve 401 , and the breathing hole 402 is used to balance the internal cavity of the valve needle sleeve 401 with the external pressure.

[0043] A limit ring 406 is provided on the outer side of the top of the valve needle sleeve 401 , and the limit 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 limit ring 406 , and the bottom end of the return spring 5 contacts the inner wall of the valve sleeve 2 .

[0044] In the above technical solution, through the cooperation of the limiting ring 406 and the reset spring 5, when the nut injection molded part 701 moves axially, the valve needle sleeve 401 moves with the nut injection molded part 701 under the action of the reset spring 5, and the reset spring 5 is used to reset the valve needle sleeve 401.

[0045] The valve needle assembly 405 includes a valve stem 4051, which is slidably sleeved with the sealing cover 404. The top of the valve stem 4051 is fixedly connected to a limit block 4052, and a positioning protrusion 4053 is fixedly connected to the upper surface of the limit block 4052. 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 limiting block 4052 is clearance-matched 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 and the buffer spring 403 are sleeved with each other.

[0046] In the above technical solution, through the design of the limit block 4052, the limit block 4052 and the valve needle sleeve 401 are clearance-matched. When the valve stem 4051 moves up and down, the limit block 4052 realizes the guiding effect on the valve stem 4051; the positioning protrusion 4053 and the buffer spring 403 are mutually socketed, which is used to position the installation of the buffer spring 403.

[0047] A fixing convex ring 4041 is disposed on the upper surface of the sealing cover 404 . The sealing cover 404 and the fixing convex ring 4041 are integrally formed. The size of the fixing convex ring 4041 matches that of the valve needle sleeve 401 . The fixing convex ring 4041 is fixedly sleeved with the valve needle sleeve 401 .

[0048] In the above technical solution, the fixed convex ring 4041 on the upper surface of the cover 404 is over-fitted with the valve needle sleeve 401. The function of the cover 404 is mainly to guide and radially limit the valve needle assembly 405. The outer wall of the cover 404 is annularly welded to the bottom outer wall of the valve needle sleeve 401.

[0049] The rotor assembly 8 includes a magnetic rotor 801, the top inner wall of the magnetic rotor 801 is fixedly connected with a connecting ring 803, the interior of the connecting ring 803 is fixedly connected with a rotor insert 802, the connecting ring 803 and the rotor insert 802 are integrally formed, and the bottom outer wall of the rotor insert 802 is provided with a fixing slot 804; the nut assembly 7 includes a nut injection molding 701, the internal thread of the nut injection molding 701 is connected with a screw rod 702, the screw rod 702 is fixedly sleeved with the rotor insert 802, and the top end of the screw rod 702 is welded with the upper surface of the rotor insert 802 by an annular seam, 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, and an upper stopper 7041 is arranged on the top of the spring guide rail 704, and 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, and 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 through the fixed clamping groove 804. Through the design of the fixed clamping groove 804 and the upper stopper 7041, the upper stopper 7041 is clamped into the fixed clamping groove 804, and when the rotor insert 802 rotates, the spring guide rail 704 can be driven to rotate, and when the rotor insert 802 moves axially, the spring guide rail 704 can be driven to move axially; A slip ring 705 is sleeved on the outer wall of the nut injection molding 701, and the spring guide rail 704 is in contact with the slip ring 705. A limiting protrusion 7051 is arranged at the bottom end of the slip ring 705. The slip ring 705 and the limiting protrusion 7051 are integrally formed. A limiting groove 703 is provided on the outer wall of the nut injection molding 701, and the limiting protrusion 7051 extends into the limiting groove 703.

[0050] In the above technical solution, when the rotor assembly 8 rotates counterclockwise under the action of the electromagnetic force, the rotor assembly 8 drives the screw rod 702 to rotate, the screw rod 702 descends, and the rotor insert 802 drives the spring guide rail 704 to rotate counterclockwise through the fixed slot 804. Since the limiting protrusion 7051 of the slip ring 705 is inserted into the limiting slide groove 703, the limiting slide groove 703 on the outer wall of the nut injection molding 701 limits the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will move axially along the direction of the limiting slide groove 703 and the spring guide rail 704, and the slip ring 705 descends. When the limiting protrusion 7051 at the slip ring 705 moves to the lower stopper 7042, the limiting protrusion 7051 is blocked and limited by the lower stopper 7042, and the axial movement is terminated; When the rotor assembly 8 rotates clockwise under the action of electromagnetic force, the rotor assembly 8 drives the screw rod 702 to rotate, the screw rod 702 rises, and the rotor insert 802 drives the spring guide rail 704 to rotate clockwise through the fixed slot 804. Since the limiting protrusion 7051 of the slip ring 705 is inserted into the limiting slide groove 703, the limiting slide groove 703 on the outer wall of the nut injection molding 701 limits the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will move axially along the direction of the limiting slide groove 703 and the spring guide rail 704, and the slip ring 705 rises. When the limiting protrusion 7051 on the slip ring 705 moves to the bottom of the upper stopper 7041, the limiting protrusion 7051 is blocked and limited by the upper stopper 7041, and the axial movement stops.

[0051] 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 . The nut insert 6 is fixedly sleeved on the outer wall of the limiting convex ring 706 .

[0052] A second sealing ring 11 is sleeved on the middle outer wall of the valve sleeve 2, and a placement groove 105 is opened 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 bottom outer wall of the valve sleeve 2, and 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.

[0053] In the above technical solution, the sealing performance of the electronic expansion valve is improved through the design of the first sealing ring 10 and the second sealing ring 11.

[0054] A locking groove 301 is formed on the upper surface of the locking nut 3 .

[0055] In the above technical solution, through the design of the locking groove 301, the locking nut 3 is sleeved on the outside of the valve sleeve 2. When the locking nut 3 is screwed into the internal thread 104, an auxiliary tool is used to be inserted into the locking groove 301, so as to facilitate applying a certain torque to the locking nut 3 to lock and fix the valve sleeve 2 and the valve block 1.

[0056] The specific usage and function of this embodiment are as follows: When the present invention is used, when the rotor assembly 8 rotates counterclockwise under the action of electromagnetic force, the rotor assembly 8 drives the screw rod 702 to rotate, the screw rod 702 descends, and the rotor insert 802 drives the spring guide rail 704 to rotate counterclockwise through the fixed slot 804. Since the limiting protrusion 7051 of the slip ring 705 is inserted into the limiting slide groove 703, the limiting slide groove 703 on the outer wall of the nut injection molding 701 limits the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will move axially along the direction of the limiting slide groove 703 and the spring guide rail 704, and the slip ring 705 descends. When the limiting protrusion 7051 at the slip ring 705 moves to the lower stopper 7042, the limiting protrusion 7051 is blocked and limited by the lower stopper 7042, and the axial movement is terminated; For the above structure and process, please refer to Figure 1 and Figure 13-18 .

[0057] The screw rod 702 generates a downward force, which directly acts on the upper surface of the valve needle sleeve 401, and the return spring 5 is squeezed. The valve needle sleeve 401 overcomes the return spring force of the return spring 5 so that the valve needle sleeve 401 moves downward with the screw rod 702, and 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 is in 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. At this time, when the valve needle sleeve 401 continues to move downward under the action of the screw rod 702, the buffer spring 403 inside the valve needle sleeve 401 is further compressed, and the buffer spring 403 applies a certain spring force to the valve needle assembly 405, so that the valve port sealing effect at the bottom of the valve sleeve 2 is further enhanced; For the above structure and process, please refer to Figure 1-18 .

[0058] When the rotor assembly 8 rotates clockwise under the action of the electromagnetic force, the rotor assembly 8 drives the screw rod 702 to rotate, the screw rod 702 rises, and the rotor insert 802 drives the spring guide rail 704 to rotate clockwise through the fixed slot 804. Since the limiting protrusion 7051 of the slip ring 705 is inserted into the limiting slide groove 703, the limiting slide groove 703 on the outer wall of the nut injection molding 701 limits the radial rotation of the slip ring 705. Therefore, at this time, the slip ring 705 will move axially along the direction of the limiting slide groove 703 and the spring guide rail 704, and the slip ring 705 rises. When the limiting protrusion 7051 on the slip ring 705 moves to the bottom of the upper stopper 7041, the limiting protrusion 7051 is blocked and limited by the upper stopper 7041, and the axial movement stops. 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 rail 704, and the limiting protrusion 7051 on the slip ring 705 cooperates with the upper stopper 7041 and the lower stopper 7042 at the spring guide rail 704, so as to limit the axial position of the screw rod 702; the advantage of such a design is that, under the premise of meeting the functional conditions of the electronic expansion valve stop structure, compared with the electronic expansion valve with a stopper rod in the existing design, the design structure omits the stopper rod and a welding process between the stopper rod and the rotor insert 802, thereby saving costs; at the same time, due to the omission of the stopper rod, the stopper structure can be assembled more simply and quickly, and the production efficiency is also improved; For the above structure and process, please refer to Figure 1 and Figure 13-18 .

[0059] When the screw rod 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 along with the screw rod 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.

[0060] 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 to work, and the screw rod 702 and the valve needle sleeve 401 are improved to point contact. Compared with the traditional electronic expansion valve, the need to weld the screw rod 702 and 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, each structure in the valve core structure 4 is simple and compact. Under the premise of ensuring its function, it not only reduces the welding steps, but also optimizes the number of parts, saves costs and improves production efficiency.

[0061] For the above structure and process, please refer to Figure 1-18 .

[0062] When the present invention is assembled: 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, perform annular seam welding on the connection between the cover 404 and the valve needle sleeve 401, and complete the assembly of the valve core structure 4; S2, sleeve the return spring 5 with the valve needle sleeve 401, install the return spring 5 into the valve needle sleeve 401, and then install the valve core structure 4 into the valve sleeve 2; S3, screw the screw 702 into the nut injection molded part 701, the spring guide rail 704 and the slip ring 705 are sleeved outside the nut injection molded part 701, and the left side of the limiting protrusion 7051 on the slip ring 705 is fitted with the right side of the lower stopper 7042 on the spring guide rail 704, and the assembly of the nut assembly 7 is completed; S4, press the nut insert 6 into the assembled valve sleeve 2 with interference fit, and press the nut insert 6 to the mechanical limit; S5, the rotor insert 802 and the top fixing sleeve of the screw rod 702 are combined and fixedly welded by using welding equipment, and then the screw rod 702 is rotated to a proper position so that the spring guide rail 704 is inserted into the fixing slot 804; S6. After the sealing sleeve 9 is pressed into the outer wall of the valve sleeve 2 to a mechanical limit, the connection between the sealing sleeve 9 and the valve sleeve 2 is fixed by circumferential welding; S7, insert the second sealing ring 11 and the first sealing ring 10 into the outer side of the valve sleeve 2, and install the assembled valve sleeve 2 into the valve block 1; S8. Sleeve the locking nut 3 onto the outside of 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.

[0063] For the above structure and process, please refer to Figure 1-18 .

[0064] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which 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).

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 2, characterized in that: 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).

7. The electronic expansion valve for a vehicle thermal management system according to claim 6, characterized in that: 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).

8. The electronic expansion valve for a vehicle thermal management system according to claim 7, 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).

9. 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).

10. 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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