Electronic expansion valve

Abstract

The electronic expansion valve comprises a guide sleeve, a valve seat and a valve element, and at least part of the valve element is located on the guide sleeve; the electronic expansion valve is provided with a communicating port, the communicating port is located in the corresponding position of the peripheral side of the valve element, the electronic expansion valve is provided with a first channel and a second channel, and the communicating port can communicate with the first channel and the second channel; fluid impacts the valve element after entering from the first channel, the valve element deviates, and the valve element has more than two working positions in the height direction, so that by means of the technical scheme, no matter what position the valve element moves to, the supporting part can guarantee that the valve element is supported, and the deviation angle of the valve element is reduced.

Description

Technical Field

[0001] The present application relates to the field of flow control, and in particular to an electronic expansion valve. Background Art

[0002] In the prior art, the electronic expansion valve uses a guide sleeve to improve the coaxiality of the valve core installation. The guide sleeve is fixed to the housing, and the valve core and the guide sleeve are limited and can slide along the guide sleeve. There is a gap between the valve core and the guide sleeve. Therefore, when the valve core is impacted by the fluid, the valve core will deviate to the side away from the inlet, causing the valve core to be offset, which in turn affects the accuracy of flow control. Summary of the invention

[0003] The object of the present application is to provide an electronic expansion valve, the electronic expansion valve comprising a guide sleeve, a valve seat, and a valve core, wherein at least a portion of the valve core is located in the guide sleeve; the electronic expansion valve has a communication port, the communication port is located at a corresponding position on the circumference of the valve core, the electronic expansion valve has a first channel and a second channel, and the communication port can connect the first channel and the second channel;

[0004] The guide sleeve comprises a guide section, at least a portion of the valve core is located in the guide section, and the valve core can slide in a height direction along the guide section;

[0005] The guide section has a support portion relatively far away from the first channel, at least part of the communication port is located below the guide section or in the guide section, and most of the projection of the communication port along the radial direction of the electronic expansion valve toward the support portion can be located in the support portion.

[0006] The above technical solution has the following advantages: since the connecting port is located at a corresponding position on the circumferential side of the valve core, and the guide section has a support portion relatively far away from the first channel, at least a portion of the connecting port is located below the guide section or on the guide section, and the projection of the connecting port along the radial direction of the electronic expansion valve toward the support portion can be located on the support portion. In this way, when the fluid flows toward the connecting port, the projection of the connecting port along the radial direction of the electronic expansion valve toward the support portion can be located on the support portion, so that the support portion can provide a support for the valve seat, reduce the influence of the fluid impact on the valve core, and help improve the accuracy of flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of an implementation mode of the electronic expansion valve of the present invention.

[0008] Figure 2 for Figure 1 Schematic diagram of the structure of the middle guide sleeve.

[0009] Figure 3 The figure is a schematic structural diagram of another implementation manner of the guide sleeve.

[0010] Figure 4 The figure is a schematic structural diagram of another implementation manner of the guide sleeve.

[0011] Figure 5 The figure is a schematic structural diagram of another implementation manner of the guide sleeve.

[0012] Figure 6 The figure is a schematic structural diagram of another implementation manner of the guide sleeve.

[0013] Figure 7 for Figure 6 Axonometric structural diagram.

[0014] Figure 8 The figure is a schematic structural diagram of another implementation manner of the guide sleeve.

[0015] Fig. 9 for Figure 7 Schematic diagram of the structure of the middle guide section before processing.

[0016] Reference numerals:

[0017] 1 guide sleeve, 11 mounting section, accommodating cavity 12

[0018] 2 guide section, 21 circulation portion, 22 support portion, 23 communication hole, 24 inclined wall portion, 241 upper end portion, 242 lower end portion

[0019] 3 valve seats, 31 inlet, 32 outlet

[0020] 4 valve core

[0021] 51 first channel, 52 second channel DETAILED DESCRIPTION

[0022] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0023] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application. The up and down, front and back in the following description are based on the height direction and length direction marked in the figure.

[0024] exist Figure 1 , Figure 2 The electronic expansion valve is an implementation mode. As shown in the figure, the electronic expansion valve includes a housing, a valve seat 3, a nut, a rotor assembly, a first channel 51, a second channel 52, a guide sleeve 1, and a valve core 4.

[0025] The housing is fixed to the valve seat 3, and the valve seat 3 has a locking structure that matches the nut. The nut can be locked on the valve seat 3 without axial and circumferential movement. Alternatively, as another embodiment, the nut and the valve seat can be fixed by welding.

[0026] The electronic expansion valve has a first channel 51 and a second channel 52. The first channel 51 can be used as a fluid inlet channel, and the second channel 52 can be used as a fluid outlet channel. The electronic expansion valve has a communication port 23, which is located at a corresponding position on the circumference of the valve core 4, and the communication port 23 can connect the first channel 51 and the second channel 52.

[0027] The guide sleeve 1 is at least partially located inside the valve seat 3. In this embodiment, the guide sleeve 1 is located inside the valve seat 3. The guide sleeve 1 includes the installation section 11 and the guide section 2. The installation section 11 and the guide section 2 are integrally formed or fixed. The installation section 11 is fixed or limited to the valve seat 3. There is a gap between the guide sleeve 1 and the valve core 4 in the circumferential direction. The guide section 1 can extend in the direction of the second channel 52. At least part of the valve core (4) is located in the guide section (2), and the valve core (4) can slide in the height direction along the guide section (2); the valve core 4 can cooperate with the valve seat 3 to control the flow or closure of the fluid. In this article, the valve core 4 cooperates with the valve seat 3 to close the valve. There may be a small gap. If the valve performance can be met, a small amount of internal leakage is also allowed.

[0028] There is a certain gap between the guide sleeve 1 and the valve seat 3, and the gap is less than 0.5 cm in the height direction.

[0029] The guide sleeve 1 has a receiving chamber 12, which is a cylindrical hollow portion in the guide sleeve 1. At least part of the valve core 4 is located in the receiving chamber 12, and the valve core 4 can move in the receiving chamber 12. The first channel 51 and the receiving chamber 12 can be communicated.

[0030] The guide section 2 has a support portion 22 relatively far away from the first channel 51, at least part of the connecting port 23 is located below the guide section 2 or located on the guide section 2, and most of the projection of the connecting port 23 along the radial direction of the electronic expansion valve toward the support portion 22 can be located on the support portion 22, and most of it refers to more than 90% of the projection.

[0031] Since the connecting port 23 is located at a corresponding position on the circumferential side of the valve core 4, and the guide section 2 has a support portion relatively far away from the first channel 51, at least a portion of the connecting port 23 is located below the guide section 2 or on the guide section 2, and the projection of the connecting port 23 along the radial direction of the electronic expansion valve toward the support portion 22 can be located on the support portion 22. In this way, when the fluid flows toward the connecting port 23, the projection of the connecting port 23 along the radial direction of the electronic expansion valve toward the support portion 22 can be located on the support portion 22, so that the support portion 22 can provide a support for the valve seat 3, reduce the influence of the fluid impact on the valve core 4, and help to improve the accuracy of flow control.

[0032] The rotor assembly includes a screw rod and a rotor. The screw rod is fixed to the valve core 4. The screw rod is fixed to the rotor. The rotor will rotate when receiving an electrical signal. When the rotor rotates in a controlled manner, the screw rod can rotate with it and move in the height direction at the same time. The screw rod drives the valve core 4 to move. The valve core 4 cooperates with the valve seat 3 to realize the flow control of the fluid from the first channel into the second channel 52.

[0033] exist Figure 1 In the illustrated embodiment, the valve seat includes an inlet 31, the space of the first channel 51 includes the inlet 31, the support portion 22 is located on a side away from the inlet 31, the valve seat 3 includes an outlet 32, and the space of the second channel 52 includes the outlet 32. The flow rate of the electronic expansion valve can be controlled by adjusting the distance between the valve core 4 and the valve seat 3.

[0034] like Figure 2 In this embodiment, the guide sleeve 1 is an integrated structure, and the bottom of the guide section 2 includes an inclined wall portion 24, one end of the inclined wall portion 24 is fixed to the mounting section 11, and the inclined wall portion 24 extends from the mounting section 11 toward the outlet 32 ​​and away from the inlet 31. The connecting port 23 is located between the inclined wall portion 24 and the valve seat 3. In this embodiment, along the height direction, the inclined wall portion 24 has an upper end 241 and a lower end 242. At this time, the lower end 242 is a part of the support portion 22, and the connecting port 25 is located in the space below the upper end 241 and between the upper end 241 and the valve seat 3.

[0035] In this embodiment, the space of the first channel 51 includes the space below the inclined wall portion 24. The fluid in the first channel 51 enters through the communication port. When the fluid flow rate in the first channel 51 is relatively high, it will have a certain impact on the valve core 4 at the corresponding position of the communication port. The support of the valve core 4 by the support portion 22 can help maintain the position of the valve core 4 and reduce the deviation of the valve core 4.

[0036] In this embodiment, the cylindrical structure can be cut during processing, and the cutting direction is acute with respect to the axial direction of the cylinder along the edge of the cylinder away from the inlet 31. This processing method is relatively simple and can reduce costs. When the inlet 31 enters the fluid, the first channel 51 allows the fluid to pass through, and the valve core 4 is impacted by the fluid and deflected toward the support portion 22. The support portion 22 supports the valve core 4. Since the support portion 22 is lengthened relative to the prior art, when the valve core 4 deflects the same distance, the deflection angle of the valve core 4 is smaller, and the flow control is more precise.

[0037] As another embodiment, Figure 3 In this embodiment, the guide section 2 includes an inclined wall portion 24, and the support portion 22 is a part of a cylinder. The support portion 22 extends from the mounting section 11 to the outlet 32. The space of the first channel 51 includes the space below the inclined wall portion 24. One end of the inclined wall portion 24 is fixed to the mounting section 11, and the other end extends from the mounting section 11 toward the support portion 22 and away from the inlet 31, which is equivalent to half of the cylinder. The inclined wall portion 24 and the support portion 22 are integrally formed. During processing, the cylindrical structure can be cut, and the cutting can be carried out along the lowermost side of the middle of the cylinder toward the inlet 31, which is more convenient for processing.

[0038] In this embodiment, the space of the first channel 51 includes the space below the inclined wall portion 24. When the fluid enters the inlet 31, the first channel 51 allows the fluid to pass through. The valve core 4 will be offset due to the impact of the fluid, and the direction of the offset is toward the support portion 22. The support portion 22 supports the valve core 4. Since the support portion 22 is lengthened compared with the prior art, when the valve core 4 is offset by the same distance, the offset angle of the valve core 4 is smaller, and the flow control is more precise.

[0039] As another embodiment, Figure 4The guide section 2 includes a circulation portion 21 and a support portion 22. The circulation portion 21 and the support portion 22 are fixed or integrally formed. The circulation portion 21 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is close to the first channel 51 relative to the axis of the guide section in the height direction. The support portion 22 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is far away from the first channel 51 relative to the axis of the guide section in the height direction. The circulation portion 21 and the support portion 22 extend from the mounting section 11 to the outlet 32. The communication port (23) is in the form of a through hole. The communication port 23 is located at the flow The through portion 21, the space of the first channel 51 includes the space of the connecting port 23, the accommodating chamber 12 is located between the circulating portion 21 and the supporting portion 22, the connecting port 23 is round or square and is easier to process, and the connecting port 23 is processed in the cylindrical guide section 2 during processing, and the processing is relatively simple. When the fluid enters from the inlet 31, the fluid can pass through the connecting port 23 of the circulating portion 21. The valve core is located in the accommodating chamber 12, and the outer periphery of the valve core is the connecting portion and the supporting portion. In this way, when the valve core 4 is impacted by the fluid, the supporting portion 22 supports the valve core 4, so that the offset angle of the valve core 4 is smaller and the flow control is more precise.

[0040] Or Figure 5 The guide section 2 includes a circulation portion 21 and a support portion 22. The circulation portion 21 and the support portion 22 are fixed or integrally formed. The circulation portion 21 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is close to the first channel 51 relative to the axis of the guide section in the height direction. The support portion 22 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is far away from the first channel 51 relative to the axis of the guide section in the height direction. The circulation portion 21 and the support portion 22 extend from the mounting section 11 to the outlet 32. The two or more communication ports 23 are located in the circulation portion 21. The space of the first channel 51 includes the space of the two or more communication ports 23. Through the two or more communication ports 23 of the circulation portion 21, the space of the first channel 51 includes the space of the two or more communication ports 23. The connecting port 23 allows the fluid to pass through. More than two connecting ports 23 can cause the fluid to generate vortexes, reduce the impact force on the valve core 4, and reduce the displacement of the valve core 4. The valve core 4 will be offset when impacted by the fluid, and the direction of the displacement is close to the support part 22. The support part 22 supports the valve core 4. Since the support part 22 is lengthened compared with the prior art, when the valve core 4 is offset by the same distance, the displacement angle of the valve core 4 is smaller, and the flow control is more precise. During processing, a hole can be punched on the guide section 2 of the cylindrical structure, but only half of the cylinder has a connecting port 23. During installation, the side with more than two connecting ports 23 will be aligned with the inlet pipe 31. This part is the flow portion 21. This processing method is relatively simple.

[0041] Or Figure 6 , Figure 7The guide section 2 includes a circulation portion 21 and a support portion 22, the circulation portion 21 and the support portion 22 are fixed or integrally formed, the circulation portion 21 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is close to the first channel 51 relative to the axis of the guide section in the height direction, the support portion 22 is a semi-cylindrical shape cut along the axial direction of the guide section 2, and is far away from the first channel 51 relative to the axis of the guide section in the height direction, the circulation portion 21 and the support portion 22 extend from the mounting section 11 to the outlet 32, the guide section 2 includes more than two communication ports 23, and the more than two communication ports 23 are located in the circulation portion 21, the space of the first channel 51 includes the space of the more than two communication ports 23 located in the circulation portion 21, the more than two communication ports 23 are located in the support portion 22, and the support portion 22 is located on the side away from the inlet 31, and the farthest distance between two holes in the more than two communication ports 23 is the size of the inlet 31. The two or more connecting ports 23 of the circulation portion 21 can generate vortexes for the fluid, reduce the impact force on the valve core 4, and reduce the displacement of the valve core 4. The valve core 4 will be deflected by the impact of the fluid, and the direction of the displacement is close to the support portion 22. The support portion 22 supports the valve core 4. Since the support portion 22 is lengthened compared with the prior art, when the valve core 4 is offset by the same distance, the displacement angle of the valve core 4 is smaller, and the flow control is more precise. During processing, a hole can be punched on the guide section 2 of the cylindrical structure, and there are connecting ports 23 in the circumferential direction of the entire cylinder. There is no need to consider the direction during installation, and the part aligned with the inlet 31 pipe is the circulation portion 21. This structure can simplify the installation steps.

[0042] like Figure 7 , Fig. 9 In order to reduce the difficulty of processing, the installation section 11 and the guide section 2 can be set separately, the installation section 11 and the guide section 2 are fixed or limited, the guide section 2 is an annular sleeve, the guide section 2 includes more than two connecting ports 23, the guide section is sleeved on the outer periphery of the installation section, the connecting ports pass through the guide section and the installation section, and the inner diameter of the guide section 2 is equal to the outer diameter of the installation section 11.

[0043] like Fig. 9 Before processing, the guide segment 2 is in a planar shape. After the guide segment 2 is punched, the guide segment 2 is rolled into a cylindrical shape, and then the guide segment 2 and the mounting segment 11 are fixed. Compared with processing a connecting port 23 on the cylindrical guide segment 2, the processing difficulty is low and the processing feasibility can be increased.

[0044] like Figure 8The support portion 22 is semi-cylindrical, the support portion 22 is fixed to the mounting section 11, the support portion 22 extends from the mounting section 11 to the outlet 32, and the first channel 51 includes a space where the inlet 31 extends toward the support portion 22 but does not contact the support portion 22.

[0045] Therefore, the fluid can enter the electronic expansion valve through the first channel 51, and the valve core 4 will be offset due to the impact of the fluid, and the direction of the offset is close to the support part 22. The support part 22 supports the valve core 4. Since the support part 22 is lengthened compared with the prior art, when the valve core 4 is offset by the same distance, the offset angle of the valve core 4 is smaller, and the flow control is more precise.

[0046] Furthermore, in the above-mentioned embodiment including the support portion 22, the support portion 22 extends toward the outlet 32, and the height of the lowest point of the support portion 22 is higher than the height of the highest point of the valve seat 3. This is because when the lowest end of the support portion 22 does not touch the valve seat 3, the longer the length of the support portion 22, the smaller the angle of displacement of the valve core 4 when the valve core 4 abuts against the support portion 22, but the valve seat 3 cannot contact the guide section 2, otherwise the valve core 4 moves to a position with a larger opening, the valve seat 3 affects the flow rate, and the fluid enters the electronic expansion valve from the first channel 51 and then flows out of the electronic expansion valve from the second channel 52.

[0047] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The electronic expansion valve comprises a guide sleeve (1), a valve seat (3), and a valve core (4), wherein at least a portion of the valve core (4) is located in the guide sleeve (1); the electronic expansion valve has a communication port (23), wherein the communication port (23) is located at a corresponding position on the circumference of the valve core (4); the electronic expansion valve has a first channel (51) and a second channel (52), and the communication port (23) can communicate the first channel (51) with the second channel (52); The guide sleeve (1) comprises a guide section (2), at least a portion of the valve core (4) is located in the guide section (2), and the valve core (4) can slide in a height direction along the guide section (2); The guide section (2) has a support portion (22) relatively far away from the first channel (51); at least a portion of the communication port (23) is located below the guide section (2) or located on the guide section (2); and a projection of the communication port (23) along the radial direction of the electronic expansion valve toward the support portion (22) can mostly be located on the support portion (22).

2. The electronic expansion valve according to claim 1, characterized in that: The valve seat (3) includes an inlet (31), the space of the first channel (51) includes the inlet (31), the support portion (22) is located on a side away from the inlet (31), the valve seat (3) includes an outlet (32), and the space of the second channel (52) includes the outlet (32); The guide sleeve (1) has a mounting section (11), the mounting section (11) and the guide section (2) are integrally formed or fixed, and the mounting section (11) is fixed or limited with the valve seat (3).

3. The electronic expansion valve according to claim 2, characterized in that: The bottom of the guide section (2) comprises an inclined wall portion (24), the inclined wall portion (24) having an upper end portion (241) and a lower end portion (242), a portion of the first channel (51) being located between the upper end portion (241) and the valve seat (3), the lower end portion (242) being a portion of the support portion (22), and the communication port (23) being located in the space below the upper end portion (241) of the inclined wall portion (24).

4. The electronic expansion valve according to claim 2, characterized in that: The guide section (2) comprises an inclined wall portion (24), the support portion (22) is a part of a cylinder, the support portion (22) extends from the mounting section (11) toward the outlet (32), the inclined wall portion (24) has an upper end portion (241) and a lower end portion (242), a portion of the first channel (51) is located between the upper end portion (241) and the valve seat (3), the lower end portion (242) is a part of the support portion (22), and the communication port (23) is located in the space below the upper end portion (241) of the inclined wall portion (24).

5. The electronic expansion valve according to claim 2, characterized in that: The guide section (2) comprises a circulation portion (21) and a support portion (22); the circulation portion (21) and the support portion (22) are fixed or integrally formed; the circulation portion (21) is in the shape of a semi-cylindrical portion cut along the axial direction of the guide section (2) and is located on a side close to the first channel (51) relative to the axis of the guide section (2) in the height direction; the support portion (22) is in the shape of a semi-cylindrical portion cut along the axial direction of the guide section (2) and is located on a side away from the first channel (51) relative to the axis of the guide section (2) in the height direction; the circulation portion (21) and the support portion (22) extend from the mounting section (11) toward the outlet (32); the communication port (23) is in the form of a through hole; and the communication port (23) is located in the circulation portion (21).

6. The electronic expansion valve according to claim 2, characterized in that: The guide section (2) comprises a circulation portion (21) and a support portion (22). The circulation portion (21) and the support portion (22) are fixed or integrally formed. The circulation portion (21) is a semi-cylindrical shape cut along the axial direction of the guide section (2) and is located on a side close to the first channel (51) relative to the axis in the height direction of the guide section. The support portion (22) is a semi-cylindrical shape cut along the axial direction of the guide section (2) and is located on a side away from the first channel (51) relative to the axis in the height direction of the guide section (2). The circulation portion (21) and the support portion (22) extend from the mounting section (11) to the outlet (32). The communication port (23) is in the form of a through hole. There are more than two communication ports (23), and the more than two communication ports (23) are located in the circulation portion (21).

7. The electronic expansion valve according to claim 2, characterized in that: The guide section (2) comprises a circulation portion (21) and a support portion (22). The circulation portion (21) and the support portion (22) are fixed or integrally formed. The circulation portion (21) is a semi-cylindrical shape cut along the axial direction of the guide section (2) and is located on a side close to the first channel (51) relative to the axis in the height direction of the guide section. The support portion (22) is a semi-cylindrical shape cut along the axial direction of the guide section (2) and is located on a side away from the first channel (51) relative to the axis in the height direction of the guide section. The circulation portion (21) and the support portion (22) extend from the mounting section (11) to the outlet (32). There are more than two communication ports (23), and the more than two communication ports (23) are located in the circulation portion (21). The space of the first channel (51) includes the space of the more than two communication ports (23) located in the circulation portion (21), and the more than two communication ports (23) are located in the support portion (22). The support portion (22) is located on a side away from the inlet (31).

8. The electronic expansion valve according to claim 7, characterized in that: The mounting section (11) and the guide section (2) are fixed or position-limited, the guide section (2) is an annular sleeve, the guide section (2) is sleeved on the outer circumference of the mounting section (11), the communication opening (23) passes through the guide section (2) and the mounting section (11), and there are more than two communication openings (23).

9. The electronic expansion valve according to claim 2, characterized in that: The support portion (22) is semi-cylindrical, the support portion (22) is fixed to the mounting section (11), the support portion (22) extends from the mounting section (11) toward the outlet (32), and the first channel (51) includes a space where the inlet (31) extends toward the support portion (22) but does not contact the support portion (22).

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that: There is a gap between the guide sleeve (1) and the valve seat (3), and the gap is less than 0.5 cm in the height direction.

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