Reducing electronic expansion valve

Abstract

The invention provides a reducing electronic expansion valve which comprises a sealing tank, a bearing seat and a valve element seat, the sealing tank is arranged on the bearing seat, a bearing is arranged above the bearing seat in a sleeving mode, the valve element seat is clamped below the bearing seat, a valve needle is inserted into the valve element seat, a rotation stopping pin is installed on the valve needle, and the rotation stopping pin is connected with the bearing seat. A sliding valve for controlling the flow of the valve element seat is further arranged between the valve needle and the valve element seat, a space for the sliding valve to move upwards is formed in the bearing seat, a flow channel for keeping the pressure of the space balanced is formed in the sliding valve, the upper end of the valve needle extends into the sealing tank, a rotor support is arranged in the sealing tank, and a motor rotor is arranged outside the rotor support in a sleeving mode. According to the electronic expansion valve, when small-flow throttling is needed, the needle valve moves up and down to open the first flow channel in the sliding valve, when large-flow throttling is needed, the sliding valve driven by the rotation stopping pin on the needle valve moves upwards to open the second flow channel in the valve element seat, and control over the electronic expansion valve from small-flow throttling to large-flow throttling is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a variable-diameter electronic expansion valve. Background Art

[0002] Electronic expansion valves use electrical signals generated by the regulated parameters to control the voltage or current applied to the expansion valve, thereby regulating the liquid supply. As a new type of control component, electronic expansion valves have become a key component in the intelligentization of refrigeration systems and a crucial means and guarantee for achieving true refrigeration system optimization. They are being used in a growing number of fields. Electronic expansion valves are used in key control assemblies in automotive thermal management systems. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a variable diameter electronic expansion valve.

[0004] An embodiment of the present invention provides a variable-diameter electronic expansion valve, including a sealing tank, a bearing seat and a valve core seat, the sealing tank is arranged on the bearing seat, a bearing is sleeved on the upper part of the bearing seat, a valve core seat is engaged with the lower part of the bearing seat, a valve needle is inserted in the valve core seat, a stop pin is installed on the valve needle, and a sliding valve for controlling the flow of the valve core seat is also provided between the valve needle and the valve core seat, a sliding groove for moving the sliding valve upward is provided in the bearing seat, a flow channel for maintaining spatial pressure balance is provided on the sliding valve, a first flow channel is provided on the sliding valve, a second flow channel is provided on the valve core seat, a stop pin slide groove on the sliding valve, and the stop pin is located at the lower end of the stop pin slide groove. As the valve needle rises, the stop pin rises to the upper end of the stop pin slide groove, and the valve needle drives the sliding valve to rise and open the second flow channel on the valve core seat.

[0005] Preferably, the upper end of the valve needle extends into the sealing can, and a rotor bracket is provided in the sealing can. One end of the rotor bracket is fixed to the inner ring of the bearing, and the other end of the rotor bracket is mounted on the motor rotor insert.

[0006] Preferably, the rotor bracket is provided with a motor rotor, the valve needle located in the sealing tank is provided with a transmission nut and a nut coupling, the transmission nut is provided with a compression spring, and the transmission nut and the nut coupling are located in the rotor bracket.

[0007] Preferably, a motor rotor insert is provided on the motor rotor, and one end of the valve needle is arranged on the motor rotor insert.

[0008] Preferably, one end of the sealing can is an open structure, and the other end of the sealing can is an arc-shaped structure, and the open end of the sealing can is fastened to the bearing seat.

[0009] Preferably, the motor rotor is movably engaged in the sealing can, and the motor rotor and the rotor bracket are both fixed on the motor rotor insert.

[0010] Preferably, the rotor bracket adopts a hollow cylinder with a stepped structure, and the cylinder at the bottom has a smaller diameter and is used to fix the nut coupling.

[0011] Preferably, a first sealing ring is provided between the valve needle and the sliding valve, and a second sealing ring is provided between the sliding valve and the valve core seat.

[0012] Preferably, an open groove structure is provided on the valve core seat, and the open groove of the valve core seat is movably connected to the anti-rotation pin through a snap-fit connection.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] When a small flow rate is required for throttling, the needle valve of the present invention moves up and down to open the first flow channel on the slide valve. When a large flow rate is required, the slide valve driven by the stop pin on the needle valve moves upward to open the second flow channel on the valve core seat, thereby realizing the throttling control of the electronic expansion valve from a small flow rate to a large flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the transverse cross-sectional structure of a variable diameter electronic expansion valve described in the present invention.

[0016] Figure 2 The figure is a schematic diagram of the longitudinal cross-sectional structure of a variable diameter electronic expansion valve described in the present invention.

[0017] In the above drawings: 1. bearing seat, 2. sliding valve, 3. sealing tank, 4. valve core seat, 5. first sealing ring, 6. second sealing ring, 7. valve needle, 8. check pin, 9. flow channel, 10. nut coupling, 11. motor rotor, 12. motor rotor insert, 13. compression spring, 14. transmission nut, 15. rotor bracket, 16. bearing, 17. first flow channel, 17. second flow channel, 19. check pin slide; 20. slide. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1-Figure 2 As shown, an embodiment of the present invention provides a variable diameter electronic expansion valve, comprising a sealing tank 3, a bearing seat 1 and a valve core seat 4. The sealing tank 3 is arranged on the bearing seat 1, one end of the sealing tank 3 is an open structure, and the other end of the sealing tank 3 is an arc structure, and the open end of the sealing tank 3 is fastened to the bearing seat 1;

[0020] A bearing 16 is sleeved on the upper part of the bearing seat 1, and the bearing 16 adopts a deep groove ball bearing. A valve core seat 4 is clamped under the bearing seat 1, and a valve needle 7 is inserted into the valve core seat 4. A stop pin 8 is installed on the valve needle 7. A slide valve 2 for controlling the flow of the valve core seat 4 is also provided between the valve needle 7 and the valve core seat 4. The slide valve 2 is provided on the valve needle 7. A first sealing ring 5 is provided between the valve needle 7 and the slide valve 2, and a second sealing ring 6 is provided between the slide valve 2 and the valve core seat 4; A sliding groove 20 for the upward movement of the sliding valve 4 is provided in the seat 1, and a flow channel 9 for maintaining spatial pressure balance is provided on the sliding valve 2. The sliding valve 2 is provided with a first flow channel 17, and the valve core seat 4 is provided with a second flow channel 18. A stop pin sliding groove 19 is provided on the sliding valve 2, and the stop pin 8 is located at the lower end of the stop pin sliding groove 19. As the valve needle 7 rises, the stop pin 8 rises to the upper end of the stop pin sliding groove 19, and the valve needle 7 drives the sliding valve 2 to rise and open the second flow channel 18 on the valve core seat 4.

[0021] The upper end of the valve needle 7 extends into the sealing tank 3, and a rotor bracket 15 is provided in the sealing tank 3. One end of the rotor bracket 15 is fixed to the inner ring of the bearing 16, and the other end of the rotor bracket 17 is installed on the motor rotor insert 12; and the rotor bracket 15 is outer-mounted with a motor rotor 11, and the valve needle 7 located in the sealing tank 3 is sleeved with a transmission nut 14 and a nut coupling 10, and the transmission nut 14 is sleeved with a compression spring 13, and the transmission nut 14 and the nut coupling 10 are located in the rotor bracket 15.

[0022] In the present invention, the motor rotor 11 is provided with a motor rotor insert 12, and one end of the valve needle 7 is disposed on the motor rotor insert 12. The motor rotor 11 is movably engaged within the sealing can 3, and the motor rotor 11 and the rotor bracket 15 are both fixed to the motor rotor insert 12. Specifically, the rotor bracket 15 is a hollow cylinder with a stepped structure. The lower cylinder has a smaller diameter and is used to fix the nut coupling 16.

[0023] In the present invention, an open groove structure is provided on the valve core seat 4, and the open groove of the valve core seat 4 is movably connected to the anti-rotation pin 8 through engagement.

[0024] The present invention is composed of a slide valve assembly, a drive assembly and a valve core assembly, which are specifically as follows:

[0025] The spool valve assembly, consisting of the valve needle 7, stop pin 8, spool valve 2, valve core seat 4, first sealing ring 5, and second sealing ring 6, is secured to the bearing seat 1. The stop pin 8 on the valve needle 7 engages with the stop pin slot 19 on the spool valve 2, limiting the valve needle 7's rotational movement to a maximum of 3mm. When the spool valve 2 is secured to the bearing seat 1 and valve core seat 4, the slot 20 on the valve core seat 4 limits its rotational movement to a maximum of 3mm.

[0026] The drive assembly consists of the motor rotor 11, rotor bracket 15, compression spring 13, drive nut 14, nut coupling 10, and bearing 16. The compression spring 13, drive nut 14, and nut coupling 10 are engaged and then fastened to the rotor bracket 15 via the nut coupling 10. The rotor bracket 15 is fastened to the motor rotor insert 12, while ensuring a gap of no more than 0.2 mm between the drive nut 14 and rotor bracket 15. The rotor bracket 15 is then fastened to the inner ring of the bearing 16.

[0027] The valve core assembly composed of the valve needle 7 on the sliding valve assembly is screwed into the rotating nut 14, the outer ring of the bearing 16 and the inner hole of the bearing seat 1 are fastened, and the sealing tank 3 and the bearing seat 1 are sealed and welded to form a complete variable diameter electronic expansion valve.

[0028] The stop pin slot 19 on the slide valve 2 is formed by the stop pin to limit the up and down movement of the valve needle 7. The flow channel 9 is designed on the upper and lower end surfaces of the slide valve 2. Under the action of the refrigerant, the pressure on the upper end surface of the slide valve 2 is always greater than the pressure on the lower end surface.

[0029] During use, the motor loads torque to rotate the motor rotor 11, which drives the rotor bracket 15 to rotate, causing the rotor bracket 15 to drive the nut coupling 10 to rotate. The nut coupling 10 causes the transmission nut 14 to rotate, and the transmission nut 14 and the valve needle 7 move relative to each other, causing the valve needle 7 to move axially. The valve needle 7 moves through the limit of the slide valve 2, opening the first flow channel 17 on the slide valve 2. Since the front end of the valve needle 7 is smaller, the flow rate is smaller at this time; the transmission nut 14 and the valve needle 7 continue to move relative to each other, and as the stop pin 8 moves from the lower end of the stop pin slide groove 19 to the upper end of the stop pin slide groove 19, the slide valve 2 is driven to move upward, thereby opening the second flow channel 19 on the valve core seat 4. Since the front end of the slide valve 2 is thicker than the valve needle 7, the flow rate increases at this time.

[0030] When closing, the transmission nut 14 drives the valve needle 7 to return to its original position under the action of the compression spring 13. First, the stop pin 8 moves from the upper end of the stop pin slide 19 to the lower end of the stop pin slide 19, and continues to descend to drive the slide valve 2 to close the second flow channel 18 on the valve core seat 4. Then the valve needle 7 continues to descend to close the first flow channel 17. Finally, the stop pin 8 contacts the bearing seat 1, so that the valve needle 7 is blocked.

[0031] In the present invention, when small flow throttling is required, the needle valve 7 moves up and down to open the first flow channel 17 on the slide valve 2, and the full stroke is 3mm. When a large amount of flow is required, the slide valve 2 driven by the stop pin 8 on the needle valve 7 moves upward to open the second flow channel 18 on the valve core seat 4, and the full stroke is 3mm, thereby realizing the control from small flow throttling to large flow throttling.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A variable diameter electronic expansion valve, comprising a sealing tank (3), a bearing seat (1) and a valve core seat (4), characterized in that: The sealing tank (3) is arranged on the bearing seat (1), a bearing (16) is sleeved on the upper part of the bearing seat (1), a valve core seat (4) is engaged with the lower part of the bearing seat (1), a valve needle (7) is inserted into the valve core seat (4), a stop pin (8) is installed on the valve needle (7), a slide valve (2) for controlling the flow of the valve core seat (4) is also provided between the valve needle (7) and the valve core seat (4), a slide groove (20) for the upward movement of the slide valve (4) is provided in the bearing seat (1), and a flow channel for maintaining spatial pressure balance is provided on the slide valve (2). (9), the upper end of the valve needle (7) extends into the sealing tank (3), the slide valve (2) is provided with a first flow channel (17), the valve core seat (4) is provided with a second flow channel (18), the slide valve (2) has a stop pin slide groove (19), and the stop pin (8) is located at the lower end of the stop pin slide groove (19). As the valve needle (7) rises, the stop pin (8) rises to the upper end of the stop pin slide groove (19), and the valve needle (7) drives the slide valve (2) to rise and open the second flow channel (18) on the valve core seat (4).

2. The variable diameter electronic expansion valve according to claim 1, characterized in that: The upper end of the valve needle (7) extends into the sealing tank (3), and a rotor bracket (15) is provided in the sealing tank (3). One end of the rotor bracket (15) is fixed to the inner ring of the bearing (16), and the other end of the rotor bracket (17) is installed on the motor rotor insert (12).

3. The variable diameter electronic expansion valve according to claim 1, characterized in that: The rotor bracket (15) is provided with a motor rotor (11) on its outer sleeve, a transmission nut (14) and a nut coupling (10) are provided on the valve needle (7) located in the sealing tank (3), a compression spring (13) is provided on the transmission nut (14), and the transmission nut (14) and the nut coupling (10) are located in the rotor bracket (15).

4. The variable diameter electronic expansion valve according to claim 1, characterized in that: The motor rotor (11) is provided with a motor rotor insert (12), and one end of the valve needle (7) is arranged on the motor rotor insert (12).

5. The variable diameter electronic expansion valve according to claim 1, characterized in that: The rotor bracket (15) adopts a hollow cylinder with a stepped structure, wherein the cylinder located at the bottom has a smaller diameter and is used to fix the nut coupling (16).

6. The variable diameter electronic expansion valve according to claim 1, characterized in that: A first sealing ring (5) is provided between the valve needle (7) and the slide valve (2), and a second sealing ring (6) is provided between the slide valve (2) and the valve core seat (4).

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