Electric valve

Abstract

The electric valve comprises a valve seat and a valve element, the valve seat is provided with a first inlet and further comprises a valve port part, the valve port part is provided with a valve port channel, and the first inlet can communicate with the valve port channel; the valve element can be close to or away from the valve port part in the longitudinal direction of the electric valve so as to adjust the communication area of the valve port channel, and the valve element is provided with a first position and a second position. In the longitudinal direction of the electric valve, the second position is farther from the valve port part than the first position; and when the valve element moves from the second position to the first position, the conduction area of the first inlet is gradually reduced. Therefore, the first inlet can share part of fluid pressure, so that the pressure difference between the upper side and the lower side of the valve port part is reduced, the fluid flow speed at the valve port channel is reduced, and erosive wear of fluid to the valve port part is relieved.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, and in particular to an electric valve. Background Technology

[0002] In related technologies, electric valves include a valve core and a valve port. The valve port has a valve port passage. The valve core can move up and down to approach or move away from the valve port to adjust the flow area of ​​the valve port passage. When the valve port passage is close, the pressure difference between the upper and lower sides of the valve port is large and the fluid velocity is high. Also, because the fluid may contain impurities, the impurities in the fluid will erode and wear the valve port. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the following technical solutions are provided:

[0004] An electric valve includes a valve seat and a valve core. The valve seat has a first inlet and a valve port portion. The valve port portion has a valve port channel. The first inlet can communicate with the valve port channel. The valve core can move closer to or further away from the valve port portion along the longitudinal direction of the electric valve to adjust the conduction area of ​​the valve port channel. The valve core has a first position and a second position along the longitudinal direction of the electric valve, wherein the second position is further away from the valve port portion than the first position.

[0005] As the valve core moves from the second position to the first position, the conduction area of ​​the first inlet gradually decreases.

[0006] Since the second position is farther from the valve port than the first position, the conduction area of ​​the first inlet gradually decreases as the valve core moves from the second position to the first position. That is, the conduction area of ​​the first inlet decreases for at least a certain period of the stroke before the valve is closed. In this way, the first inlet can share the fluid pressure, thereby reducing the pressure difference between the upper and lower sides of the valve port, and thus reducing the fluid velocity at the valve port channel. This helps to slow down the scouring and wear of the valve port by impurities in the fluid. Attached Figure Description

[0007] Figure 1 This is a cross-sectional schematic diagram of one embodiment of this application;

[0008] Figure 2 for Figure 1 Enlarged schematic diagram of region A in the middle;

[0009] Figure 3 for Figure 1 A schematic diagram of the valve core in the first position;

[0010] Figure 4 This is a schematic diagram of a first cross-section in one embodiment;

[0011] Figure 5 This is a schematic diagram of another embodiment;

[0012] Figure 6 This is a schematic diagram of yet another embodiment;

[0013] Figure 7 This is a schematic diagram of another embodiment;

[0014] Figure 8 This is a schematic diagram showing the functional relationship between the connecting channel and the valve port channel and the valve core position.

[0015] Figure label:

[0016] 1. Valve seat; 2. Valve core; 3. Valve port; 4. First valve chamber; 5. Seal; 6. Protective part;

[0017] 11. Second valve chamber; 12. Connecting channel; 13. First sub-section; 14. Second sub-section; 15. Receiving cavity; 21. Valve needle section; 22. Main body section; 31. Valve port channel; 211. Adjustment section; 212. Sealing mating section; 121. First inlet;

[0018] 100. Electrical control components; 200. Valve body; 201. Inner cavity; 300. Base; 301. First channel; 302. Second channel; 400. Transmission assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] like Figure 1-4 as well as Figure 8 As shown, an electric valve includes an electric control component 100, a valve body 200, a base 300, and a transmission assembly 400. The electric control component 100 is fitted onto the valve body 200, and both the electric control component 100 and the valve body 200 are fixed to the base 300. The valve body 200 has an inner cavity 201. At least a portion of the transmission assembly 400 is located within the inner cavity 201 of the valve body 200. The transmission assembly 400 has a magnetic component. The electric control component 100 controls the operation of the transmission assembly 400 by generating a rotating magnetic field. The base 300 has a first channel 301 and a second channel 302.

[0021] The electric valve also includes a valve seat 1, a valve core 2, a valve port 3, and a sealing element 5. The valve seat 1 is fixed to the base 300, and the valve core 2 is connected to the transmission assembly 400. The transmission assembly 400 can drive the valve core 2 to move up and down along the longitudinal direction of the electric valve. The electric valve also has a first valve chamber 4, which is located in the base 300, and a first channel 301 and a second channel 302 are respectively connected to the first valve chamber 4. The valve seat 1 has a receiving cavity 15, a connecting channel 1, and a first inlet 121. At least a portion of the valve core 2 is located in the receiving cavity 15, and the valve core 2 slides against the corresponding wall of the receiving cavity 15. Along the longitudinal direction of the electric valve, the space between the main body of the valve core 2 and the corresponding bottom wall of the receiving cavity 15 is the second valve chamber 11. The first inlet 121 is directed toward the valve core along the radial direction of the valve core, and the valve core can obstruct the conduction of the first inlet 121. The connecting channel 12 is connected to the first valve chamber 4 and the first inlet 121. The valve port portion 3 has a valve port channel 31. The first inlet 121 can communicate with the valve port channel. Specifically, when the valve core is separated from the valve port portion, the first inlet 121 communicates with the second valve chamber 11, and the second valve chamber communicates with the valve port channel. The valve core 2 can move closer to or further away from the valve port portion 3 along the longitudinal direction of the electric valve (in this application, the longitudinal direction of the electric valve is the axial direction of the valve core 2) to adjust the conduction area of ​​the valve port channel 31 (in this application, the conduction area of ​​the valve port channel is also the communication area between the valve port channel and the receiving cavity).

[0022] The valve core 2 can move along the longitudinal direction of the electric valve to adjust the conduction area of ​​the first inlet 121; the valve core 2 has a first position and a second position, and along the longitudinal direction of the electric valve, the second position is farther away from the valve port 3 than the first position; as the valve core moves from the second position to the first position, the conduction area of ​​the first inlet 121 gradually decreases.

[0023] In the first position, the conduction area of ​​the first inlet 121 is SA1—when the number of first inlets 121 is greater than one, SA1 refers to the sum of the conduction areas of all first inlets 121 in the first position; the conduction area of ​​the valve port channel 31 is SB1. In the second position, the conduction area of ​​the first inlet 121 is SA2—when the number of first inlets 121 is greater than one, SA2 refers to the sum of the conduction areas of all first inlets 121 in the second position; the conduction area of ​​the valve port channel 31 is SB2, where SA2 is greater than SA1 and SB2 is greater than SB1.

[0024] Since the second position is farther from the valve port than the first position, the conduction area of ​​the first inlet 121 gradually decreases as the valve core moves from the second position to the first position. That is, the conduction area of ​​the first inlet 121 decreases during at least a certain period of the stroke before the valve is closed. In this way, the first inlet 121 can share the fluid pressure, thereby reducing the pressure difference between the upper and lower sides of the valve port and reducing the fluid velocity at the valve port channel. This helps to slow down the scouring and wear of the valve port by impurities in the fluid.

[0025] In this embodiment, the first position is the valve-closed position, that is, in the first position, the valve core closes the valve port. In some embodiments, along the longitudinal direction of the electric valve, the first position is farther away from the valve port than the valve-closed position. When the valve core moves from the second position to the valve-closed position, the conduction area of ​​the first inlet 121 gradually decreases first and then remains constant. Specifically, when the valve core moves from the first position to the valve-closed position, along the radial direction of the valve core, the valve core has covered the first inlet 121, and the conduction area of ​​the first inlet 121 has reached its minimum.

[0026] The valve core 2 has an integrally formed valve needle portion 21 and a main body portion 22. One end of the valve needle portion 21 is connected to the main body portion 22. The main body portion 22 slides in cooperation with the wall corresponding to the second valve cavity 11. The valve needle portion 21 is used to cooperate with the wall corresponding to the valve port channel 31 to adjust the conduction area of ​​the valve port channel 31. The side wall of the main body portion 22 can cooperate with the wall corresponding to the connecting channel 12 to adjust the conduction area of ​​the first inlet 121. Specifically, during the downward movement of the valve core 2 (that is, during the movement of the valve core 2 from the second position to the first position), the valve needle portion 21 will gradually reduce the conduction area of ​​the valve port channel 31, and the side wall of the main body portion 22 will gradually cover the connection between the connecting channel 12 and the second valve cavity 11 (that is, the first inlet 121), thereby gradually reducing the conduction area of ​​the first inlet 121.

[0027] join Figure 3 The valve core has a third position along the longitudinal direction of the electric valve, and a second position between the third position and the first position. In the third position, along the longitudinal direction of the electric valve, the valve needle 21 is separated from the valve port 3. Along the longitudinal direction of the electric valve, the main body 22 is further away from the valve port than the wall corresponding to the first inlet 121—that is, both the valve port channel 31 and the first inlet 121 are in the maximum opening state.

[0028] See Figure 2 In the first position, the valve core 2 closes the valve port 3, and the side wall of the main body 22 covers the connection between the connecting channel 12 and the second valve chamber 11.

[0029] The valve core 2 also has a fourth position along the longitudinal direction of the electric valve. The fourth position is located between the first position and the second position. In the fourth position, the conduction area of ​​the first inlet 121 (when the number of first inlets 121 is greater than one, the conduction area here refers to the sum of the conduction areas of all first inlets 121) is the same as the conduction area of ​​the valve port channel 31.

[0030] Between the second and fourth positions, the conduction area of ​​the first inlet 121 (when the number of first inlets 121 is greater than one, the conduction area refers to the sum of the conduction areas of all first inlets 121) is greater than or equal to the conduction area of ​​the valve port channel 31. Between the fourth and first positions, the conduction area of ​​the first inlet 121 (when the number of first inlets 121 is greater than one, the conduction area refers to the sum of the conduction areas of all first inlets 121) is less than or equal to the conduction area of ​​the valve port channel 31.

[0031] The connecting channel 12 penetrates the side wall of the valve seat 1 along the radial direction of the valve seat 1. There are at least two connecting channels 12 and at least two first inlets 121. The number of connecting channels and the number of first inlets 121 are the same, and the connecting channels 12 and the first inlets 121 are evenly distributed along the circumferential direction of the valve seat 1.

[0032] Since there are at least two and the same number of connecting channels 12 and first inlets 121, and both connecting channels 12 and first inlets 121 are evenly distributed along the circumferential direction of valve seat 1, in the radial direction of valve core 2, it is beneficial to balance the impact force of fluid entering the second valve chamber 11 from each connecting channel 12 on valve core 2, thereby reducing wear between valve core 2 and second valve chamber 11.

[0033] The valve port 3 is located on the valve seat 1 along the longitudinal direction of the electric valve. At least a portion of the seal 5 is located between the valve port 3 and the valve core 2. The seal is made of a flexible material (such as rubber). The valve core 2 can seal against the seal 5 to achieve complete valve closure. Thus, the cooperation between the valve core 2 and the seal 5 (i.e., the sealing contact between the valve core 2 and the seal 5) facilitates reliable closure of the valve port passage 31. In this embodiment, the seal is fixed or axially limited to the valve seat. In some embodiments, the seal is fixed or axially limited to the valve needle portion of the valve core, specifically, the seal is sleeved on the valve needle portion of the valve core.

[0034] A point M is defined on the wall corresponding to the first inlet 121, where the distance between the wall corresponding to the first inlet 121 and the wall corresponding to the valve port channel 31 is minimized. A point N is defined on the wall corresponding to the valve port channel 31, where the distance between the wall corresponding to the valve port channel 31 and the wall corresponding to the connecting channel 12 is minimized. A first cross-section is defined, which is parallel to the longitudinal direction of the electric valve, and points M and N are both located on the first cross-section. In the first cross-section, the main body of the valve core 2 is located on one side of the line connecting points M and N, and the sealing element 5 is located on the opposite side of the line connecting points M and N.

[0035] Since point M is the point where the distance between the wall corresponding to the first inlet 121 and the wall corresponding to the valve port channel 31 is the minimum, and point N is the point where the distance between the wall corresponding to the valve port channel 31 and the wall corresponding to the connecting channel 12 is the minimum, points M and N are the shortest flow paths of the fluid. The seal 5 is located on the opposite side of the line connecting points M and N, which helps to prevent the seal 5 from being directly impacted by the fluid. Since the seal is made of flexible material, the fluid velocity is high when the valve is close. If it is directly impacted by the fluid, it will aggravate the wear of the seal, thereby reducing the sealing reliability of the seal, and thus making it impossible for the valve core and the seal to be completely closed.

[0036] The valve needle portion 21 has an adjusting section 211 and a sealing section 212. Along the longitudinal direction of the electric valve, the sealing section 212 is further away from the valve port portion 3 than the adjusting section 211. The two ends of the sealing section 212 are connected to the main body portion 22 of the valve core 2 and the adjusting section 211, respectively. The adjusting section 211 is used for wall fitting with the valve port passage 31, and the sealing section 212 is used for sealing contact with the sealing element 5. In this embodiment, the outer diameter of the sealing section 212 is constant or approximately constant, and the outer diameter of the sealing section 212 is larger than the outer diameter of the adjusting section 211. That is, the sealing section 212 forms a step-like shape. This results in a small sealing area between the sealing section 212 and the sealing element 5, which is beneficial for quickly cutting off the fluid and achieving a seal. In some embodiments, along the longitudinal direction of the electric valve, from the adjusting section 211 towards the sealing section 212, the outer diameter of the sealing section 212 gradually increases. This is beneficial for increasing the sealing area between the sealing section 212 and the sealing element 5, thereby improving the reliability of the seal.

[0037] The electric valve includes a protective part 6. Along the longitudinal direction of the electric valve, the protective part 6 is closer to the sealing element 5 than the wall corresponding to the first inlet 121. The inner diameter of the protective part 6 is less than or equal to the outer diameter of the valve core 2 body.

[0038] Because the protective part 6 is closer to the sealing element 5 than the wall corresponding to the first inlet 121 along the longitudinal direction of the electric valve, the protective part 6 limits the sealing element 5 and prevents it from moving upward. Furthermore, in practice, due to the sliding fit between the main body 22 and the wall corresponding to the second valve chamber 11, there may be a gap between them. Although the side wall of the main body 22 covers the connection between the connecting channel 12 and the second valve chamber 11, this does not mean that the main body 22 completely blocks the connection between the connecting channel 12 and the second valve chamber 11. That is, fluid can still flow into the second valve chamber 11 through the aforementioned gap. When the valve core 2 blocks the connecting channel 12 in its radial direction, fluid can still flow through the gap between the valve core 2 and the wall corresponding to the second valve chamber 11. The fluid flows into the second valve chamber 11. The fluid flow rate in this part is fast. Since the material of the seal 5 is relatively soft, if the seal 5 is directly impacted, it will wear down the seal 5, which may cause corresponding sealing failure and increase the impurities in the fluid. Since the inner diameter of the protective part 6 is less than or equal to the outer diameter of the valve core 2 body, the protective part 6 protects the seal 5 and prevents the fluid flowing in through the gap between the valve core 2 and the corresponding wall of the second valve chamber 11 from directly scouring the seal 5. This further reduces the possibility of impurities in the fluid embedding into the surface of the seal and ensures the reliability of the sealing fit between the seal and the valve core (if there are impurities with high hardness in the fluid, if they are embedded in the surface of the seal, there may be some gap after the valve core and the seal come into contact, which may lead to sealing failure).

[0039] The protective part 6 is integrally formed with the valve seat 1. The protective part 6 protrudes from the wall corresponding to the second valve cavity 11, and the inner diameter of the protective part 6 is less than or equal to the outer diameter of the valve core 2 body. By forming the protective part 6 integrally with the valve seat 1, on the one hand, it is beneficial to reduce the number of parts and improve the integration, and on the other hand, it is beneficial to ensure the reliability of the protective part 6 in axially limiting the seal 5.

[0040] See Figure 8 The S-axis represents the connected area, the x-axis represents the distance of valve core 2 from the second position along the longitudinal direction of the electric valve, f1 represents the function curve of the conducting area of ​​the first inlet 121 (when the number of first inlets 121 is greater than one, the conducting area at this point refers to the sum of the conducting areas of all first inlets 121) versus the position of valve core 2, and f2 represents the function curve of the conducting area of ​​valve port channel 31 versus the position of valve core 2. Point a represents the intersection of the function curves f1 and f2, which is when valve core 2 is in the fourth position.

[0041] Figure 5 Another embodiment is shown, in which the protective part 6 and the valve seat 1 are separately disposed, and the projection of the outer peripheral wall of the sealing member 5 is located on the protective part 6 along the longitudinal direction of the electric valve.

[0042] Since the protective part 6 and the valve seat 1 are set separately, that is, the protective part 6 is a separate component, the sealing element 5 can be placed in the second valve cavity 11 first during assembly, and then the sealing element 5 can be installed into the second valve cavity 11. The assembly process is simple and conducive to automation.

[0043] Figure 6 Another embodiment is shown. In this embodiment, the valve seat 1 has a first sub-part 13 and a second sub-part 14 that are separately arranged. The protective part 6 is integrally arranged with the first sub-part 13. The valve port 3 is located in the second sub-part 14. The second sub-part 14 is at least partially fitted inside the first sub-part 13. A portion of the sealing member 5 is located between the protective part 6 and the second sub-part 14. In this embodiment, the entire second sub-part 14 is fitted inside the first sub-part 13. In some embodiments, a portion of the second sub-part 14 is fitted inside the first sub-part 13. In this embodiment, the first sub-part 13 and the second sub-part 14 are connected by threads. In some embodiments, the first sub-part 13 and the second sub-part 14 can also be fixedly connected by welding.

[0044] Since the first sub-part 13 and the second sub-part 14 are separate, during assembly, the first sealing element 5 can be placed inside the first sub-part 13 first, and then at least a portion of the second sub-part 14 can be fitted inside the first sub-part 13. This facilitates the assembly of the sealing element 5.

[0045] Figure 7 Another embodiment is shown, in which the electric valve further includes a seal 5, the seal 5 being at least partially located in the second valve chamber 11, the valve port portion 3 being located in the seal 5, and the valve port passage 31 penetrating the body of the seal 5 along the axial direction of the seal 5; in the first position, the valve core 2 and the seal 5 are in sealing contact.

[0046] Since the valve port 3 is located on the seal 5, and the valve port channel 31 passes through the body of the seal 5 along the axial direction of the seal 5, the valve core 2 cooperates with the seal 5 (that is, the valve core 2 and the seal 5 seal against each other), which helps to reliably close the valve port channel 31.

[0047] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various changes, modifications, substitutions, and variations without departing from the concept of the present invention, and these all fall within the protection scope of this application.

Claims

1. An electric valve comprising a valve seat (1) and a valve core (2), the valve seat (1) comprising a valve port portion (3), the valve seat (1) having a first inlet (121), the valve seat (1) comprising a valve port portion (3), the valve port portion (3) having a valve port passage (31), the first inlet (121) being able to communicate with the valve port passage (31), the valve core (2) being able to approach or be away from the valve port portion (3) along a longitudinal direction of the electric valve to adjust a conductive area of the valve port passage (31), characterized in that, the valve core (2) has a first position and a second position, the second position being away from the valve port portion (3) than the first position along the longitudinal direction of the electric valve; a conductive area of the first inlet (121) gradually decreases from the second position to the first position of the valve core (2).

2. The motorized valve of claim 1, wherein, the first inlet (121) is directed towards the valve core (2) along a radial direction of the valve core (2), the valve core (2) being able to obstruct the conductive area of the first inlet (121); the valve core (2) has a valve needle portion (21) and a main body portion (22), one end of the valve needle portion (21) being connected with the main body portion (22), the valve needle portion (21) being used to cooperate with a wall corresponding to the valve port passage (31) to adjust the conductive area of the valve port passage (31), a side wall of the main body portion (22) being able to cooperate with a wall corresponding to the first inlet (121) to adjust the conductive area of the first inlet (121).

3. Motorized valve according to claim 1 or 2, characterized in that the number of the first inlets (121) is at least two, and the first inlets (121) are uniformly distributed along a circumferential direction of the valve seat (1).

4. The motorized valve according to claim 1 or 2, characterized in that the electric valve further comprises a sealing member (5), the valve seat (1) having a containing cavity (15), at least part of the valve core (2) being located in the containing cavity (15), the first inlet (121) and the valve port passage (31) being able to communicate with the containing cavity (15) respectively; the sealing member (5) is at least partially located in the containing cavity (15), the valve port portion (3) being located in the sealing member (5), the valve port passage (31) penetrating through a body of the sealing member (5) along an axial direction of the sealing member (5); in the first position, the valve core (2) is in sealing abutment with the sealing member (5).

5. The motorized valve of claim 4, wherein, the valve port portion (3) is located in the valve seat (1), at least part of the sealing member (5) being located between the valve port portion (3) and the valve core (2) along the longitudinal direction of the electric valve, the valve core (2) being able to be in sealing abutment with the sealing member (5) to achieve valve closing.

6. The motorized valve of claim 5, wherein, A point M is defined on the wall corresponding to the first inlet (121), which is the point where the wall corresponding to the first inlet (121) is closest to the wall corresponding to the valve port passage (31). A point N is defined on the wall corresponding to the valve port passage (31), which is the point where the wall corresponding to the valve port passage (31) is closest to the wall corresponding to the first inlet (121). A first cross section is defined, which is parallel to the longitudinal direction of the electric valve, and the points M and N are both located on the first cross section. In the first cross section, the main body of the valve core (2) is located on one side of the line connecting the points M and N, and the sealing element (5) is located on the opposite side of the line connecting the points M and N.

7. An electrically powered valve according to claim 4 or 5, characterised in that The valve core (2) has a valve needle portion (21) for cooperating with the wall corresponding to the valve port passage (31) to adjust the flow area of the valve port passage (31). The valve needle portion (21) has an adjustment section (211) and a sealing cooperation section (212). In the longitudinal direction of the electric valve, the sealing cooperation section (212) is farther away from the valve port portion (3) than the adjustment section (211). The adjustment section (211) is used to cooperate with the wall corresponding to the valve port passage (31), and the sealing cooperation section (212) is used to sealingly abut against the sealing element (5). The outer diameter of the sealing cooperation section (212) is constant or substantially constant, and the outer diameter of the sealing cooperation section (212) is greater than the outer diameter of the adjustment section (211), or In the longitudinal direction of the electric valve, the outer diameter of the sealing cooperation section (212) gradually increases from the adjustment section (211) towards the sealing cooperation section (212).

8. The motorized valve of claim 4 or 5, wherein, The valve core (2) has a main body portion (22), and the side wall of the main body portion (22) can cooperate with the wall corresponding to the first inlet (121) to adjust the flow area of the first inlet (121). The electric valve includes a protective portion (6), which is closer to the sealing element (5) than the wall corresponding to the first inlet (121) in the longitudinal direction of the electric valve. The inner diameter of the protective portion (6) is less than or equal to the outer diameter of the main body portion (22).

9. The motorized valve of claim 8, wherein, The protective portion (6) is integrally provided with the valve seat (1), and the protective portion (6) protrudes from the wall corresponding to the accommodating cavity (15). The inner diameter of the protective portion (6) is less than or equal to the outer diameter of the main body of the valve core (2); or The protective portion (6) is separately provided with the valve seat (1), and the projection of the outer peripheral wall of the sealing element (5) is located in the protective portion (6) in the longitudinal direction of the electric valve.

10. The motorized valve of claim 9, wherein, The valve seat (1) has a first sub-portion (13) and a second sub-portion (14) provided separately. The protective portion (6) is integrally provided with the first sub-portion (13), and the valve port portion (3) is located in the second sub-portion (14). The second sub-portion (14) is at least partially sleeved in the first sub-portion (13), and part of the sealing element (5) is located between the protective portion (6) and the second sub-portion (14).

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