KR102565973B1 - electric valve - Google Patents

Abstract

An electric valve comprising a valve body component (10), a valve base component (20), and a valve core component (30) is disclosed. The valve core component 30 is disposed in the inner cavity of the valve body component 10 . The valve core component 30 includes a valve core 31 . The valve core 31 is approximately tubular. The valve core 31 includes a lower section 311 . The outer diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end, and a first obtuse angle θ is formed between the outer wall of the lower section 311 and the end face of the lower section 311, 90 degrees < θ ≤ 100 degrees, and/or the inner diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end, and on the longitudinal section of the lower section 311, the lower section 311 A second obtuse angle γ is formed between the inner wall of and the end face of the lower section 311, and 90 degrees < γ ≤ 100 degrees. The valve core component also includes a second sealing portion 321 . The diameter of the axial projection loop of the outer edge of the second sealing portion 321 on the lower section 311 is D1. On the cross section of the lower section 311, the diameter D1 of the axial projection loop, the outer diameter D2 of the lower section 311 and the inner diameter D3 of the lower section 311 are 0.2 mm ² ≤ D1*(D2- D3) satisfies the relation of ≤ 6 mm ² . This electric valve can reduce internal leakage when the electric valve is closed.

Description

electric valve

This application claims the benefit of priority to the following two Chinese patent applications, both of which are incorporated herein by reference.

1) Chinese Patent Application No. 201910259740.X entitled “Electric Valve” filed with the Chinese Intellectual Property Office on April 2, 2019

2) Chinese Patent Application No. 201910380541.4 entitled “Electric Valve” filed with the Chinese Intellectual Property Office on May 8, 2019

The present application relates to the field of fluid control technology, and more particularly to electric valves.

11 is a schematic diagram of a partial structure of an electric valve in the background. The electric valve as shown in FIG. 11 includes a valve seat 01, a fluid inlet 02 and a fluid outlet 03. The valve seat 01 includes a valve port portion 011, and the valve core 04 moves in the axial direction to abut or separate from the valve port portion 011 to close or open the valve port 012 of the electric valve. can How to reduce internal leakage when closing an electric valve is a technical problem that a person skilled in the art always seeks to solve.

An object of the present disclosure is to provide an electric valve in which internal leakage is reduced when the electric valve is closed.

An electric valve according to the present disclosure includes a valve body part, a valve seat part, and a valve core part disposed in an inner chamber of the valve body part. The valve core part includes a valve core, the valve core is substantially tubular, the valve core includes a body portion and a lower section, and the lower section is substantially annular. The valve seat component includes a first sealing portion, and an end of the lower section is configured to abut or separate from the first sealing portion. Valve body parts include bushing parts. The valve core component includes a second sealing portion, the valve core component is slidably fitted with the bushing component through the second sealing portion, and the second sealing portion abuts against an inner wall of the bushing component. The inner chamber includes a first chamber located above the valve core component, the valve core component includes an equalization passage, and when the lower section abuts on the first sealing portion, the first chamber passes through the equalization passage to the electric valve. It communicates with the first fluid port. The outer diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and a first obtuse angle θ is formed between the outer wall of the lower section and the end face of the lower section, 90 degrees < θ ≤ 100 degrees / Or, the inner diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and in the longitudinal section of the lower section, a second obtuse angle γ is formed between the inner wall of the lower section and the end face of the lower section, , 90 degrees < γ ≤ 100 degrees. The diameter of an axial projection circular line of the outer edge of the second sealing portion on the cross section of the lower section is D1. In the cross section of the lower section, the diameter (D1) of the axial projection circular line, the outer diameter (D2) of the lower section and the inner diameter (D3) of the lower section have a relationship of 0.2 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² meets

In the electric valve according to the present disclosure, the outer diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and the first obtuse angle θ is formed between the outer wall of the lower section and the end face of the lower section, 90 degrees < θ ≤ 100 degrees. and/or the inner diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and in the longitudinal section of the lower section, a second obtuse angle γ is formed between the inner wall of the lower section and the end face of the lower section. , and 90 degrees < γ ≤ 100 degrees. The diameter of the axially projected circular line of the outer edge of the second sealing portion on the cross section of the lower section is D1. In the cross section of the lower section, the diameter (D1) of the axially projected circular line, the outer diameter (D2) of the lower section and the inner diameter (D3) of the lower section have the relation 0.2 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² to reduce internal leakage when the electric valve is closed.

1 is a schematic structural diagram of an electric valve provided according to the present disclosure in a closed state;
Figure 2 is a partially enlarged view of part I1 of Figure 1,
3 is a schematic structural diagram of the valve core of FIG. 1;
Figure 4a is a partially enlarged view of part I2 of Figure 3,
Fig. 4b is a schematic structural diagram of a first modified example of part I3 in Fig. 4a;
Fig. 4c is a schematic structural diagram of another modification of part I3 in Fig. 4a;
5A is a schematic diagram of the force analysis of the valve core part when the fluid enters in the forward direction;
Figure 5b is a schematic diagram of the force analysis of the valve core component when the fluid enters in the reverse direction;
6 is a schematic structural diagram of an electric valve provided according to a second embodiment of the present disclosure;
7 is a partial schematic structural diagram of FIG. 6;
8 is a schematic structural diagram of the valve core of FIG. 6;
9 is a schematic structural diagram of an electric valve provided according to a third embodiment of the present disclosure;
10 is a partial schematic structural diagram of the electric valve of FIG. 9;
11 is a schematic diagram of a partial structure of an electric valve in the background.

In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in more detail with reference to drawings and specific embodiments.

Here, it should be noted that directional terms such as up and down included herein are defined together with components at positions indicated in the drawings herein, which are only for clarification and ease of description of technical solutions. It will be appreciated that the fragrance terms used herein should not limit the scope of protection herein.

"Fixedly connected" herein means that two components can be fixedly connected directly, or that two components can be fixedly connected by another component, i.e., two components are fixedly connected indirectly.

The formula "D2-D3" herein is calculated relative to the same cross-section of the lower section.

1 is a schematic structural diagram of an electric valve according to a first embodiment of the present disclosure, FIG. 2 is a partially enlarged view of part I1 in FIG. 1, FIG. 3 is a schematic structural diagram of a valve core in FIG. 1, and FIG. 4A is a diagram. 3 is a partially enlarged view of part I2, and FIG. 4B is a schematic structural diagram of a first modified example of part I3 in FIG. 4A.

As shown in Figs. 1, 3 and 4A, the electric valve includes a valve body part 10, a valve seat part 20, a valve core part 30 and a seal assembly. The valve body part 10 includes a valve body 11, and a second fluid port A is formed in the valve body 11. The valve seat part 20 includes a valve seat 21 and a sealing ring 22, and a first fluid port B is formed in the valve seat 21. The valve core component 30 is disposed in the inner chamber of the valve body component 10 . The valve core component 30 includes a valve core 31 , the valve core 31 being substantially tubular, and the valve core 31 including a circular lower section 311 . The sealing ring 22 includes a first sealing portion 221, and an end of the lower section 311 is configured to abut against or be separated from the first sealing portion 221 so that the second fluid port A is connected to the first sealing portion 221. It may or may not be in communication with the fluid port (B). The valve body component 10 further includes a bushing component 12, the valve core component 30 includes a second sealing portion 321, and the valve core 31 is formed through the second sealing portion 321. It is slidably fitted with the bushing component 12, and the second sealing portion 321 abuts against the inner wall of the bushing component 12. The inner chamber of the valve body component 10 includes a first chamber 50 located above the valve core component 30 . The valve core component 30 includes an equalization passage. When the valve core 31 comes into contact with the sealing ring 22, the first chamber 50 does not communicate with the second fluid port A, and the first chamber 50 passes the first fluid through the equalization passage. It communicates with port (B). Referring to the drawings, it can be appreciated that this design helps balance the forces of the valve core component 30.

Specifically, as shown in FIG. 3 , the valve core 31 includes a body portion 312, and the body portion 312 of the valve core 31 includes a small diameter section 3121 and a large diameter section 3122. ). That is, the outer diameter of the large-diameter section 3122 is larger than that of the small-diameter section 3121. The bushing component 12 includes a bushing 121, the outer wall of the bushing 121 being fixed to the valve body component 10 by welding, the bushing 121 comprising a substantially tubular first tubular portion 1211 Including, the first tubular portion 1211 has a substantially uniform inner diameter. The valve core component 30 further includes a sealing assembly, which is abutted between the outer wall of the small-diameter section 3121 and the inner wall of the first tubular portion 1211 . Specifically, the sealing assembly includes a sealing ring 35 and a gasket 36 . The large diameter section 3122 of the body portion 312 is slidable against the inner wall of the first tubular portion 1211 . The sealing ring 35 is disposed between the gasket 36 and the small-diameter section 3121, the inner wall of the sealing ring 35 abuts against the outer wall of the small-diameter section 3121, and the outer wall of the gasket 36 It comes into contact with the inner wall of the first tubular portion 1211, forming a dynamic seal between the valve core 31 and the bushing component 12. A dynamic seal means that the sealing assembly is slidable relative to the bushing 121 , and the sealing assembly also forms a seal between the valve core component 30 and the bushing 121 . That is, the upper part of the sealing assembly and the lower part of the sealing assembly are not in communication in this position. The gasket 36 includes a second sealing part 321 .

4A and 4B, the outer diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end of the lower section 311, and the outer wall of the lower section 311 and the lower section A first obtuse angle θ is formed between the cross sections of 311, and 90 degrees < θ ≤ 100 degrees. The inner diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end of the lower section 311, and in the longitudinal section of the lower section 311, the inner wall of the lower section 311 and the lower section A second obtuse angle γ is formed between the cross sections of (311), and 90 degrees < γ ≤ 100 degrees. The diameter of the axially projected circular line M of the outer edge of the second sealing portion 321 on the cross section of the lower section 311 is D1. In the cross section of the lower section 311, the diameter D1 of the axially projected circular line M, the outer diameter D2 of the lower section 311 and the inner diameter D3 of the lower section 311 are 1 mm ² ≤ D1 *(D2-D3) ≤ 6 mm ² satisfies the relationship. Here, it should be noted that in this embodiment, the outer wall of the lower section 311 is not uniform in diameter, and the inner wall of the lower section 311 is also not uniform in diameter. Accordingly, D2 and D3 herein are not limited to the positions shown in FIGS. 4A and 4B , which means that D2 and D3 both satisfy the above relationship at any cross section of the lower section 311 .

In addition, it should be noted that the structures shown in FIGS. 4A and 4B are merely specific embodiments. In this scheme, when the diameter of the outer wall of the lower section 311 is substantially uniform (i.e., θ = 90 degrees in the drawing), the inner diameter of the lower section 311 is the lower section 311 at the upper end of the lower section 311. may gradually decrease to the lower end of (i.e., 90 degrees < γ ≤ 100 degrees). Alternatively, if the diameter of the inner wall of the lower section 311 is substantially uniform (i.e., γ = 90 degrees in the figure), the outer diameter of the lower section 311 is from the upper end of the lower section 311 to the lower end of the lower section 311. may decrease gradually (i.e. 90 degrees < θ ≤ 100 degrees). The above two cases can be understood with reference to FIGS. 4A and 4B, and are not separately shown in the drawings.

In the electric valve according to this scheme, the outer diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end of the lower section 311, and the first obtuse angle θ of the lower section 311 is It is formed between the outer wall and the end face of the lower section 311, and 90 degrees < θ ≤ 100 degrees. and/or the inner diameter of the lower section 311 gradually decreases from the upper end of the lower section 311 to the lower end of the lower section 311, and in the longitudinal section of the lower section 311, the second obtuse angle γ is It is formed between the inner wall of the lower section 311 and the end face of the lower section 311, and 90 degrees < γ ≤ 100 degrees. In addition, the diameter of the axially projected circular line of the outer edge of the second sealing portion 321 on the cross section of the lower section 311 is D1. D1, the outer diameter D2 of the lower section 311 and the inner diameter D3 of the lower section 311 satisfy the relationship 1 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² , so that when the electric valve is closed, Reduce internal leakage.

Based on the above structure, since D1*(D2-D3) ≥ 1 mm ² , the wall of the lower section 311 may not be too thin while the diameter D1 of the axial projection circular line remains the same, which is convenient for processing On the other hand, the strength reliability of the valve core 31 is moderate, and the sealing reliability is adequate. Moreover, when the valve core 31 comes into contact with the sealing ring 22 described later to close the valve, if the sealing ring 22 is made of a soft material such as a rubber material, this design allows the lower section 311 to seal To reduce the risk of exceeding the limit of the material of the ring 22, reduce the impact of the lower section 311 of the valve core 31 on the seal ring 22, and extend the service life of the seal ring. As a result, the valve core 31 is better matched with the sealing ring 22, which reduces internal leakage when the electric valve is closed, and is conducive to the closing reliability of the electric valve.

The range of equation D1*(D2-D3) is given above, and the lower limit of the range is 1 mm ² . It is to be understood that the lower limit of equation D1*(D2-D3) can be adjusted depending on the material of the sealing ring 22. Under the premise that the seal ring 22 is made of a soft material, the lower limit can be adjusted to be relatively small when the material has a relatively high hardness, and the range of the expression D1*(D2-D3) is large; The lower limit can be adjusted to be relatively large, and the range of equation D1*(D2-D3) becomes relatively small. The lower limit can be adjusted to the minimum value of 0.2 mm ² , that is, D1*(D2-D3) ≥ 0.2 mm ² , and even with this lower limit, the goal of reducing internal leakage when the electric valve is closed can still be achieved. . For example, when the sealing ring 22 is made of PTFE plastic, the limit of D1*(D2-D3) can be adjusted to 0.2 mm ² because PTFE plastic has a higher hardness than ordinary rubber materials.

If the diameter (D1) of the axial projection circular line remains the same, if D1*(D2-D3) ≤ 6 mm ² , the opening resistance of the electric valve is optimized and the internal leakage at valve closing is reduced, which is Conducive to reliability of valve opening. The specific configuration is described in more detail below.

Moreover, the sealing ring 22 is made of a soft material to improve the sealing performance at the time of closing the electric valve. Specifically, the sealing ring 22 is made of a rubber material such as nitrile rubber. The end of the lower section 311 of the valve core 31 abuts against or is separated from the first sealing portion 221 so that the second fluid port A can communicate with the first fluid port B or not. is configured to Here, "no communication" means that the electric valve is blocked if there is no internal leakage. However, in actual products, there may be some internal leakage due to process reasons and other reasons. Therefore, one of the effects of the present invention is to reduce internal leakage and the ideal goal is to eliminate internal leakage. The inner chamber of the valve body component 10 includes a second chamber 60 located between the valve core 31 and the valve body component 10 . When the end of the lower section 311 of the valve core 31 comes into contact with the first sealing portion 221, when there is no internal leakage at the contact portion between the valve core 31 and the first sealing portion 221, The second chamber 60 does not communicate with the first fluid port (B).

Due to the material properties of the sealing ring 22, the radial dimension of the lower section 311 of the valve core 31 is configured to satisfy 0.1 mm < D2-D3 < 0.6 mm, resulting in D2-D3 > 0.1 mm, which is It is convenient for the processing of the valve core 31, and the lower section 311 of the valve core 31 comes into contact with the sealing ring 22 to reduce damage to the sealing ring 22 when the electric valve is closed.

The range of equations (D2-D3) is given above, and the lower limit of the range is 0.1 mm. As described above, the lower limit of equations (D2-D3) can be adjusted depending on the material of the sealing ring 22. Under the premise that the seal ring 22 is made of a soft material, if the hardness of the material is relatively high, the lower limit can be adjusted to be relatively small, and the range of equation (D2-D3) is large; It can be adjusted to be relatively large, and the range of formula (D2-D3) becomes relatively small. The lower limit can be adjusted to the minimum value of 0.05 mm. That is, (D2-D3) ≥ 0.05 mm. For example, when the sealing ring 22 is made of PTFE plastic, the limits of (D2-D3) can be adjusted to 0.05 mm because PTFE plastic has a higher hardness than ordinary rubber materials.

Compared to the case of D2-D3 > 0.6 mm, the case of D2-D3 < 0.6 mm can reduce the differential pressure applied to the valve core part 10, and the electrical power due to the relatively thick wall of the lower section 311 Disadvantages of valve opening reliability can be avoided. In addition, when the valve core 31 is operated in the direction of opening the valve to the small opening position (for example, the valve opening pulse is 10% or less of the full opening pulse), the fluid flows through the lower section 311 and the sealing ring. 22, which further improves the operating performance of the electric valve. In addition, in this embodiment, when D1 = 16.2 mm and the minimum value of D2-D3 is 0.2 mm, the forward and reverse operation performance of the electric valve is well guaranteed when the electric valve is a two-way valve, and the use of the sealing ring 22 Longevity is also guaranteed.

Since the sealing ring 22 is made of a soft material such as rubber, the sealing ring 22 has a certain elasticity and is elastically deformed when an external force is applied. When the valve core 31 moves downward and abuts against the first sealing part 221 to close the electric valve, when the valve core 31 moves downward, the lower section 311 of the valve core 31 and the sealing ring 22 In order to control the contact area between them, the size of the contact area is determined by the wall thickness of the lower section 311 (ie, the value of D2-D3). Therefore, the height L of the lower section 311 of the valve core 31 is configured to be 0.4 mm or more.

Moreover, the valve core 31 further includes a transition portion 313 , and the transition portion 313 is provided between the body portion 312 and the lower section 311 . To facilitate control of the contact area between the lower section 311 of the valve core 31 and the sealing ring 22, the transition part 313 comprises a first transition section 3131 connected with the lower section 311. and the longitudinal section of the first transition section 3131 is substantially conical, and as shown in FIG. 4A, the inner diameter of the upper end of the first transition section 3131 is smaller than the inner diameter of the lower end of the first transition section 3131. . Specifically, a first acute angle α is formed between the inner wall of the first transition section 3131 and the horizontal direction. The outer diameter of the upper end of the first transition section 3131 is larger than the outer diameter of the lower end of the first transition section 3131 . Specifically, a second acute angle β is formed between the outer wall of the first transition section 3131 and the horizontal direction. As shown in FIG. 3 , the transition portion 313 further includes a second transition section 3132 connected to the body portion 312, and the inner diameter of the upper end of the second transition section 3132 is the second transition section 3132. ) is smaller than the inner diameter of the lower end, the outer diameter of the upper end of the second transition section 3132 is smaller than the outer diameter of the lower end of the second transition section 3132, and the outer diameter of the upper end of the second transition section 3132 is the minimum diameter of the lower section 311. larger than the outer diameter. Since the outer diameter of the upper end of the second transition section 3132 is smaller than the minimum outer diameter of the lower section 311, the axially projected circular line M of the outer edge of the second sealing portion 321 on the valve core 31 is It can be located at any cross section of section 311, which is advantageous for force balancing of valve core component 30. Here, "force balance" means close to balance, and does not necessarily mean absolute balance, and when there is a slight imbalance of power, the power of the driving parts of the electric valve can be adjusted by appropriately changing.

The lower end of the longitudinal section of the lower section 311 of the valve core 31 is substantially arc-shaped, reducing wear of the seal ring 22 from the valve core 31 and improving the service life of the seal ring 22 let it It should be noted that in this solution, the lower surface of the valve core 31 may not have an arc shape. For example, the bottom surface of the valve core 31 is substantially planar in shape. When the lower end of the longitudinal section of the lower section 311 is substantially arcuate, the arcuate portion is relatively small, and the outer and inner diameters of the entire lower section 311 are configured to each have a uniform diameter, and the arcuate portion is configured to have a uniform diameter. It should be noted that it has little effect on the overall structure of section 311.

Fig. 4c is a schematic structural diagram of another modification of part I3 in Fig. 4a. In the valve core of this embodiment, the transition portion 313C is not provided with the first transition section of the structure in Fig. 4A, and the transition portion 313C is provided only with the second transition section 3132C. The second transition section 3132C is directly connected to the lower section 311C. The beneficial effect of this configuration is the same as that of the structure of the valve core in Fig. 4A, and is not repeated here.

As shown in FIG. 2 , the valve seat component 20 further includes an inner bushing 25 and a pressure block 26 . The valve seat 21 includes an axial through hole 27, and at least a part of the inner bushing 25 is disposed in the axial through hole 27 and fixed to the valve seat 21 by welding. The sealing ring 22 is disposed between the outside of the inner bushing 25 and the valve seat 21 . The valve seat 21 includes a first stepped portion 215, and the upper end of the valve seat 21 is pressed onto the stepped surface of the first stepped portion 215 of the valve seat 21 by crimping the pressure block 26. to fix The lower surface of the pressure block 26 opposes the upper surface of the sealing ring 22 to further constrain the sealing ring 22 axially. It is understood that the bottom surface of the pressure block 26 may or may not abut the sealing ring 22 . The pressure block 26 includes a base part 261 and a guide part 262 . The inner diameter of the guide part 262 is larger than the inner diameter of the base part 261 . When the end of the lower section 311 comes into contact with the first sealing portion 221 of the sealing ring 22, the lower section 311 of the valve core 31 is formed by the inner bushing 25 and the pressure block 26 It is loosely fitted with the base portion 261 of the Here, the loose fit means that the valve core 31 is loosely fitted with the inner bushing 25 and the pressure block 26 to avoid interference in an ideal state. However, considering factors such as assembly and machining, there may be undesirable situations where the valve core 31 interferes with the inner bushing 25 or pressure block 26 instead of forming a loose fit. Also, the inner diameter of the guide portion 262 gradually increases from bottom to top. That is, the inner hole of the guide portion 262 gradually expands from bottom to top. In this way, the axial movement of the valve core 31 is guided by the inside of the guide portion, and when the end of the lower section 311 of the valve core 31 abuts on the first sealing portion of the sealing ring 22, the valve A flow guide space Q is formed between the outer side of the core 31 and the inner wall of the pressure block 26, which is advantageous for fluid flow.

An electric valve according to an embodiment of the present application may be an electric valve having a bidirectional flow function. That is, when the electric valve is opened, the flow direction of the fluid flows in from the second fluid port (A) and flows out (hereinafter referred to as the forward direction) from the first fluid port (B), or when the electric valve is opened, the flow direction of the fluid It flows in from the first fluid port (B) and flows out (hereinafter referred to as the reverse direction) from the second fluid port (A). The electric valve of the embodiment can only allow one-way flow.

5A is a schematic diagram of force analysis of the valve core component when the fluid enters in a forward direction, and FIG. 5B is a schematic diagram of force analysis of the valve core component when the fluid enters in a reverse direction.

As shown in FIGS. 5A and 5B , when a fluid having a pressure P flows in the forward direction, the main differential pressure on the valve core part 30 is F _forward ≥ Pπ (D2 ² - D1 ² ) in the closed state and the force The direction of action of is downward, and when the fluid with pressure P flows in the reverse direction, the main differential pressure force on the valve core part 30 is F _reverse ≥ Pπ (D1 ² - D3 ² ) in the closed state, and the direction of action of the force is downward, which is also conducive to reducing internal leakage when closing the electric valve and conducive to the reliability of the electric valve closing.

When the size of the structure other than the valve core of the electric valve is fixed, that is, when D1 is fixed, there are three situations that can cause (D2-D3) to increase. First, D2 remains the same and D3 decreases. Second, D2 increases and D3 stays the same. Third, both D2 and D3 increase.

If D2 remains the same and D3 decreases, F _forward basically stays the same and F _reverse increases. That is, when the fluid flows in the forward direction, this case has little influence on the opening and closing operation of the electric valve. When the fluid flows in the reverse direction, the opening resistance of the electric valve increases, which is not conducive to the reliability of the electric valve opening when the fluid flows in the reverse direction, and the larger the value of D2-D3, the greater the side effect.

When D2 increases and D3 stays the same, F _forward increases and F _reverse basically stays the same. That is, when the fluid flows in the forward direction, the opening resistance of the electric valve increases, which does not help the reliability of the electric valve opening when the fluid flows in the forward direction, and the larger the value of D2-D3, the greater the side effect. When the fluid flows in the reverse direction, this case has little effect on the opening and closing operation of the electric valve.

When both D2 and D3 increase, F _forward increases and F _reverse decreases. That is, when the fluid flows in the forward direction, the opening resistance of the electric valve increases, which does not help the reliability of the electric valve opening when the fluid flows in the forward direction, and the larger the value of D2-D3, the greater the side effect. When the fluid flows in the reverse direction, this case helps the opening operation of the electric valve.

Therefore, the electric valve according to this scheme is designed so that 1 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² , so that when the electric valve is a two-way electric valve, the reliability of forward and reverse electric valve opening is controlled to an appropriate degree. On the other hand, the internal leakage performance and reliability of electric valve closing are improved.

The design is also advantageous for serialization of products. That is, when D1 is determined, the value range of D2-D3 can be calculated through the above numerical relationship. That is, a range of wall thicknesses of the lower section 311 of the valve stem can be obtained. Similarly, even when the range of D2-D3 is determined, the value range of D1 can be calculated through the above numerical relationship.

Based on the description of the foregoing technical solution, it should be noted that the electric valve according to the embodiment may be an electronic expansion valve capable of regulating fluid flow, or an on-off valve such as a solenoid valve or a two-way solenoid valve.

6 is a schematic structural diagram of an electric valve provided according to a second embodiment of the present disclosure; Fig. 7 is a partial schematic structural diagram of Fig. 6; Fig. 8 is a schematic structural diagram of the valve core of Fig. 6;

The difference between the electric valve of this embodiment and the electric valve of the previous embodiment is that the seal assembly is a part of the seal seat part, and the valve core part is sliding-fitted with the seal assembly. The valve core includes a second sealing part. A detailed explanation follows.

As shown in Figs. 6-8, the valve seat part further includes an inner bushing 25E and a pressure block 26E. The bushing component 12E includes a bushing 121E and a sealing assembly, and the bushing 121E includes a second tubular portion 1211E (only a portion of which is shown in the drawing). A sealing assembly is fixed or constrained to the bushing 121E, and the sealing assembly includes a sealing ring 35E and a gasket 36E. The valve core 31E includes a body portion 312E and a lower section 311E, at least a portion of the gasket 36E comes into contact with the inner wall of the body portion 312E, and the sealing ring 35E is a bushing 121E. ) to the inner wall of the Body portion 312E is slidable relative to the sealing assembly. The body portion 312E has a substantially uniform outer diameter. The outer wall of the body portion 312E includes a second sealing portion 321E. The diameter of the axially projected circular line N of the outer wall of the body portion 312E on the lower section 311E of the valve core 31E is D1. In the cross section of the lower section 311E, the outer diameter of the lower section 311E is D2, the inner diameter of the lower section 311E is D3, the diameter D1, the outer diameter D2 of the lower section 311E, and the lower section The inner diameter D3 of satisfies 1 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² . Other structures of this embodiment can be understood with reference to the first embodiment. Various deformations and force relationships of the lower section of the first embodiment are also applicable to this embodiment. Therefore, this embodiment also has the same advantageous effects as the first embodiment, which can be understood with reference to the first embodiment and are not repeated here. More specifically, in this embodiment, when D1 ≥ 9.2 mm, the minimum value of D2-D3 may be set to 0.5 mm. The forward and reverse operation performance of the electric valve is well guaranteed when the electric valve is a two-way valve, and the service life of the sealing ring 22 is also guaranteed.

9 is a schematic structural diagram of an electric valve provided according to a third embodiment of the present disclosure. Fig. 10 is a partial schematic structural diagram of the electric valve in Fig. 9;

As shown in the figure, the electric valve is specifically a solenoid valve including a plug 100 and a movable iron core 101. The plug 100 and the movable iron core 101 are components of the driving part. The valve body part 102 is fixed to the valve seat part 103 by welding, and the valve core 31F includes a body portion 312F and a lower section 311F. The valve seat component includes an inner bushing 25F and a pressure block 26F. In this embodiment, the outer wall of the body portion 312F is designed to have a uniform diameter, and the outer wall is used as the second sealing portion. The diameter D1 of the second sealing portion, the outer diameter D2 of the lower section 311F, and the inner diameter D3 of the lower section 311F satisfy 1 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² . The structure and modifications of the lower section of the first embodiment are also applicable to solenoid valves. The solenoid valve can also achieve the same function of reducing internal leakage when the electric valve is closed as in the foregoing embodiment, and other structures of the solenoid valve can be designed with reference to the foregoing embodiment, and the design is also made herein. may be modified within the framework of the principles of, which are not repeated here.

The electric valve according to the present application has been described in detail above. The principles and embodiments herein are illustrated by specific examples herein. The above description of examples is intended only to facilitate understanding of the methods and ideas herein. It should be noted that many modifications and improvements can be made to the present disclosure by those skilled in the art without departing from the principles of the present disclosure, and such modifications and improvements are also considered to fall within the protection scope of the present disclosure defined by the claims.

Claims (19)

An electric valve comprising a valve body part, a valve seat part, and a valve core part disposed in an inner chamber of the valve body part, wherein the valve core part includes a valve core, the valve core is tubular, and the valve core is tubular. includes a body portion and a lower section, the lower section being annular;
The valve seat component includes a first sealing portion, and an end of the lower section is configured to abut or separate from the first sealing portion;
The valve body part includes a bushing part,
The valve core part includes a second sealing part, the valve core part is slidably fitted with the bushing part through the second sealing part, and the second sealing part abuts against an inner wall of the bushing part,
The inner chamber includes a first chamber located above the valve core component, the valve core component includes an equalization passage, and when the lower section comes into contact with the first sealing portion, the first chamber communicates with the first fluid port of the electric valve through an equalization passage;
The outer diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and a first obtuse angle θ is formed between the outer wall of the lower section and the end surface of the lower section, and 90 degrees < θ ≤ 100 degrees, and/or the inner diameter of the lower section gradually decreases from the upper end of the lower section to the lower end of the lower section, and in a longitudinal section of the lower section, the inner wall of the lower section and the lower section A second obtuse angle (γ) is formed between the cross sections of 90 degrees < γ ≤ 100 degrees,
On the cross section of the lower section, an axially projected circular line of the outer edge of the second sealing portion has a diameter defined by D1, the outer diameter of the lower section defined by D2, and the inner diameter of the lower section defined by D3. is defined,
In the cross section of the lower section, the D1, the D2, and the D3 satisfy a relationship of 0.2 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² . The electric valve according to claim 1, which satisfies a relationship of 1 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² . The method according to claim 1, wherein the valve seat part includes a sealing ring, the sealing ring is made of a soft material, the sealing ring includes the first sealing portion, and the end portion of the lower section is formed of the first sealing portion. Abutted against or separated from the part, so that the second fluid port of the electric valve can communicate with or not communicate with the first fluid port, and the valve satisfies the relationship of 0.1 mm < D2-D3 < 0.6 mm. to do, the electric valve. The method according to claim 1, wherein the valve seat part includes a sealing ring, the sealing ring is made of a soft material, the sealing ring includes the first sealing portion, and the end portion of the lower section is formed of the first sealing portion. The electric valve, which is configured to abut against or separate from the portion so that the second fluid port of the electric valve can communicate with or not communicate with the first fluid port, and the height L of the lower section is 0.4 mm or more. The method according to claim 1, wherein the valve seat part includes a sealing ring, the sealing ring is made of a soft material, the sealing ring includes the first sealing portion, and the end portion of the lower section is formed of the first sealing portion. Abutted against or separated from the portion to allow the second fluid port of the electric valve to communicate with or not communicate with the first fluid port, the height L of the lower section is 0.4 mm or more, and the valve satisfies the relationship of 0.1 mm < D2-D3 < 0.6 mm, the electric valve. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion includes a first transition section connected to the lower section, and an inner diameter of an upper end of the first transition section is the first transition section. An electric valve, smaller than the inside diameter of the lower end of the section. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion includes a first transition section connected to the lower section, and an outer diameter of an upper end of the first transition section is the first transition section. Electric valve, larger than the outer diameter of the lower end of the section. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion includes a first transition section connected to the lower section, and an inner diameter of an upper end of the first transition section is the first transition section. and an outer diameter of the upper end of the first transition section is larger than an outer diameter of the lower end of the first transition section. The method of claim 1 , wherein a transition portion is provided between the body portion and the lower section, the transition portion includes a second transition section connected to the body portion, and an inner diameter of an upper end of the second transition section is the second transition portion. smaller than the inner diameter of the lower end of the section, the outer diameter of the upper end of the second transition section is smaller than the outer diameter of the lower end of the second transition section, and the outer diameter of the upper end of the second transition section is smaller than the outer diameter of the upper end of the lower section. Larger than inner diameter, electric valve. 10. The method according to any one of claims 1 to 9, wherein the valve core component further includes a sealing assembly, the bushing component includes a tubular first tubular portion, the sealing assembly comprising an outer wall of the valve core and the Abutted between inner walls of the first tubular portion, wherein the sealing assembly includes the second sealing portion, wherein the second sealing portion is slidably fitted with the inner wall of the first tubular portion. 11. The method of claim 10, wherein the sealing assembly includes a sealing ring and a gasket, the body portion includes a small diameter section and a large diameter section, the sealing ring is provided between the gasket and the small diameter section, and the gasket includes the second sealing portion, the valve body component further includes a valve body, the bushing component includes a bushing fixed to the valve body by welding, the bushing includes the first tubular portion, wherein the first tubular portion has a uniform inner diameter, and the diameter of an axially projected circular line of the inner wall of the first tubular portion on the valve core is D1. 10. The method of any one of claims 1 to 9, wherein the bushing component includes a bushing and seal assembly, and the valve body component further includes a valve body, the bushing being fixed to the valve body by welding, , The bushing includes a second tubular portion, the sealing assembly comes into contact between an inner wall of the second tubular portion and an outer wall of the body portion, the outer diameter of the body portion is uniform, the body portion includes the second sealing portion, , the diameter of an axially projected circular line of the outer wall of the body portion on the valve core is D1. 13. The electrical system of claim 12, wherein the sealing assembly includes a sealing ring and a gasket, the sealing ring is provided between the gasket and the second tubular portion, and at least a portion of the gasket abuts against the outer wall of the body portion. valve. 9. The system according to any one of claims 3 to 8, wherein the valve seat component further includes an inner bushing and a pressure block, the valve seat includes an axial through hole, and at least a portion of the inner bushing comprises the shaft The sealing ring is disposed between the outer side of the inner bushing and the valve seat, the valve seat includes a first step portion, and the bottom surface of the pressure block is disposed on the first step portion and/or the lower surface of the pressure block. Or, an electric valve that comes into contact with the sealing ring. 15. The method of claim 14, wherein the valve seat is fixed to the pressure block by crimping, and the pressure block includes a base portion in contact with the sealing ring and a guide portion disposed above the base portion, wherein an inner diameter of the guide portion is gradual increase from bottom to top,
and when the end of the lower section comes into contact with the sealing ring, the lower section is loosely fitted with the inner bushing and the base portion. 10. The electric valve according to any one of claims 1 to 9, wherein the lower end of the longitudinal section of the lower section is arc-shaped. The electric valve according to any one of claims 1 to 9, wherein the electric valve is an electromagnetic expansion valve or a solenoid valve. The electric valve according to claim 17, wherein the electronic expansion valve is a two-way electronic expansion valve, and the solenoid valve is a two-way solenoid valve. delete

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