KR20210113666A - electric valve - Google Patents

Abstract

An electric valve comprising a valve body part (10), a valve base part (20), and a valve core part (30) is disclosed. The valve core part 30 is disposed in the interior cavity of the valve body part 10 . The valve core component 30 comprises a valve core 31 . The valve core 31 is generally tubular. The valve core 31 includes a lower section 311 . The outer diameter of the lower section 311 gradually decreases from the upper end to the lower end of the lower section 311, and a first obtuse angle θ is formed between the outer wall of the lower section 311 and the cross section 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 to the lower end of the lower section 311, 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 the and the cross-section 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 part 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) ≤ 6 mm ² satisfies the relationship. 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

TECHNICAL FIELD This application relates to the field of fluid control technology, and more particularly to electric valves.

11 is a schematic diagram of a background art electric valve partial structure; 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 contact or separate from the valve port portion 011 to close or open the valve port 012 of the electric valve. can A method of reducing internal leakage when an electric valve is closed is a technical problem that a person skilled in the art always wants to solve.

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

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 component includes a valve core, the valve core being substantially tubular, the valve core including a body portion and a lower section, and the lower section being 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. The valve body part includes a bushing part. The valve core component includes a second sealing portion, the valve core component slidingly fits 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 positioned above the valve core part, the valve core part includes an equalization flow path, and when the lower section abuts the first sealing part, the first chamber passes through the equalization flow path of the electric valve. in communication 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 cross section 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 cross section 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 are 0.2 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² meet the

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 a first obtuse angle θ is formed between the outer wall of the lower section and the cross section 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 cross section of the lower section and 90 degrees < γ ≤ 100 degrees. The diameter of the axial projection circular line of the outer edge of the second sealing part 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 (D3) have a relationship of 0.2 mm ² ≤ D1*(D2-D3) ≤ 6 mm ² to reduce the internal leakage when the electric valve is closed.

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

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

Here, it should be noted that the directional terms such as up and down included herein are defined together with the components at positions indicated in the drawings of the present application, and this is only for clear and easy explanation of the technical solution. It will be understood that the directional terminology used herein should not limit the scope of protection herein.

As used herein, "fixedly connected" means that two components may be directly and fixedly connected, or that two components may be fixedly connected by another component, that is, two components are indirectly fixedly connected.

The formula "D2-D3" herein is calculated based on 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 of FIG. 1, FIG. 3 is a schematic structural diagram of the valve core of FIG. 1, and FIG. 4a is 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 of FIG. 4A.

1 , 3 and 4A , the electric valve includes a valve body component 10 , a valve seat component 20 , a valve core component 30 and a sealing assembly. The valve body part 10 comprises a valve body 11 , in which a second fluid port A is formed. The valve seat component 20 includes a valve seat 21 and a sealing ring 22 , wherein a first fluid port B is formed in the valve seat 21 . The valve core part 30 is arranged in the inner chamber of the valve body part 10 . The valve core part 30 comprises a valve core 31 , which is substantially tubular, and the valve core 31 comprises 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 separate from the first sealing portion 221 so that the second fluid port A is connected to the first It may or may not be in communication with the fluid port (B). The valve body part 10 further includes a bushing part 12 , the valve core part 30 includes a second sealing part 321 , and the valve core 31 is connected through the second sealing part 321 . It is slidably fitted with the bushing part 12 , and the second sealing part 321 abuts against the inner wall of the bushing part 12 . The inner chamber of the valve body part 10 comprises a first chamber 50 located above the valve core part 30 . The valve core component 30 includes an equalization flow path E. 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 through the equalization flow path E It communicates with the first fluid port (B). Referring to the drawings, it can be understood that this design helps in balancing the forces of the valve core part 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 . ) is included. That is, the outer diameter of the large-diameter section 3122 is larger than the outer diameter of the small-diameter section 3121 . The bushing part 12 comprises a bushing 121 , an outer wall of the bushing 121 is fixed to the valve body part 10 by welding, the bushing 121 being a first tubular portion 1211 which is substantially tubular. Including, the first tubular portion 1211 has a substantially uniform inner diameter. The valve core part 30 further includes a sealing assembly, which abuts 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 is Abuts against the inner wall of the first tubular portion 1211 , forming a dynamic seal between the valve core 31 and the bushing component 12 . Dynamic seal means that the sealing assembly is slidable relative to the bushing 121 , which also forms a seal between the valve core part 30 and the bushing 121 . That is, the upper side of the sealing assembly and the lower side of the sealing assembly do not communicate in this position. The gasket 36 includes a second sealing portion 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), 90 degrees < γ ≤ 100 degrees. The diameter of the axial projection circular line M of the outer edge of the second sealing part 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 axial projection 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 satisfy the relationship. Here, it should be noted that, in this embodiment, neither the outer wall of the lower section 311 nor the inner wall of the lower section 311 is 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 .

Also, it should be noted that the structures shown in FIGS. 4A and 4B are only specific embodiments. In this scheme, when the diameter of the outer wall of the lower section 311 is substantially uniform (that is, θ = 90 degrees in the drawing), the inner diameter of the lower section 311 is from the upper end of the lower section 311 to the lower section 311 may gradually decrease to the lower end of (ie, 90 degrees < γ ≤ 100 degrees). or when the inner wall of the lower section 311 has a substantially uniform diameter (ie, γ = 90 degrees in the drawing), 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 . It may decrease gradually (ie, 90 degrees < θ ≤ 100 degrees). The above two cases can be understood with reference to FIGS. 4A and 4B, which 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 is the lower section 311 . It is formed between the outer wall and the cross section 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 cross section of the lower section 311, and 90 degrees < γ ≤ 100 degrees. Moreover, the diameter of the axial projection circular line of the outer edge of the second sealing portion 321 on the cross section of the lower section 311 is D1. D1 and 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 is maintained as it is, which convenient for processing. On the other hand, the strength reliability of the valve core 31 is appropriate, and the sealing reliability is appropriate. Moreover, if the valve core 31 abuts against a sealing ring 22 to be described later to close the valve, if the sealing ring 22 is made of a soft material such as a rubber material, this design is such that the lower section 311 has a sealing To reduce the risk of exceeding the limit that the material of the ring 22 can withstand, reduce the effect of the lower section 311 of the valve core 31 on the sealing ring 22, and to prolong the service life of the sealing ring. As a result, the valve core 31 is better matched with the sealing ring 22, reducing the internal leakage when the electric valve is closed, and conducive to the closing reliability of the electric valve.

The range of the formula D1*(D2-D3) is given above, and the lower limit of the range is 1 mm ² . It is understood that the lower limit of the formula D1*(D2-D3) can be adjusted depending on the material of the sealing ring 22 . Under the premise that the sealing ring 22 is made of a soft material, if the material is of relatively high hardness, the lower limit can be adjusted to be relatively small, the range of the formula D1*(D2-D3) is large, and when the hardness of the material is relatively low The lower limit can be adjusted to be relatively large, and the range of the formula 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 the 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 (D2-D3) can be adjusted ^{to 0.2 mm 2 because the PTFE plastic has a higher hardness than a general rubber material.}

If the diameter (D1) of the axial projection circular line is kept as it is, if D1*(D2-D3) ≤ 6 mm ^{2 ,} then the opening resistance of the electric valve is optimized and the internal leakage when the valve is closed is reduced, which Contributes to the reliability of the valve opening. The specific configuration will be described in more detail below.

Moreover, the sealing ring 22 is made of a soft material to improve the sealing performance when the electric valve is closed. 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 is abutted against or separated from the first sealing portion 221 so that the second fluid port A can communicate with the first fluid port B or not. configured to do "No communication" here means that the electric valve is clogged if there is no internal leakage. However, in actual products, there may be some internal leakage due to process reasons and other reasons. Accordingly, one of the effects of the present application is to reduce internal leakage, and the ideal goal is to eliminate internal leakage. The inner chamber of the valve body part 10 comprises a second chamber 60 located between the valve core 31 and the valve body part 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 in the contact portion between the valve core 31 and the first sealing portion 221 , the second The second chamber 60 is not in communication 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 It is convenient for the processing of the valve core 31, and the lower section 311 of the valve core 31 abuts against the sealing ring 22 to reduce damage to the sealing ring 22 when the electric valve is closed.

The range of formula (D2-D3) is given above, and the lower limit of the range is 0.1 mm. As described above, the lower limit of the formula (D2-D3) can be adjusted according to the material of the sealing ring 22 . Under the premise that the sealing ring 22 is made of a soft material, when the material hardness is relatively high, the lower limit can be adjusted to be relatively small, the range of the formula (D2-D3) is large, and when the material hardness is relatively low, the lower limit is set It can be adjusted to be relatively large, and the range of the 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 PDFE plastic, the limit of (D2-D3) can be adjusted to 0.05 mm because PDFE plastic has a higher hardness than general rubber material.

Compared with 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 electric power due to the relatively thick wall of the lower section 311 . Disadvantages to the reliability of the valve opening can be avoided. Further, when the valve core 31 is actuated in a direction to open the valve to a small opening position (for example, the valve opening pulse is 10% or less of the fully open pulse), the fluid is transferred to the lower section 311 and the sealing ring (22) is able to flow quickly between, further improving 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 Life 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 subjected to an external force. When the valve core 31 moves downward and comes into contact with the first sealing part 221 to close the electric valve, when the valve core 31 moves downward, the valve core 31 lower section 311 and the sealing ring 22 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 ). Accordingly, 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 , the transition portion 313 being 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 portion 313 includes 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 greater 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 with the body portion 312 , the inner diameter of the upper end of the second transition section 3132 being the second transition section 3132 . ) 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 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 axial projection circular line M of the outer edge of the second sealing portion 321 on the valve core 31 is lower It can be located at any cross-section of the section 311 , which is advantageous for force balancing of the valve core part 30 . Here, "force balance" means something close to balance, and does not necessarily mean absolute balance.

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

4C is a schematic structural diagram of another modified example of the portion I3 of FIG. 4A. In the valve core of this embodiment, the transition portion 313C is not provided with the first transition section of the structure of 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 advantageous effect of this configuration is the same as the effect of the structure of the valve core in Fig. 4A, and thus 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 portion 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 crimped on the stepped surface of the valve seat 21 and the first stepped portion 215 by a pressure block 26 . to fix The bottom surface of the pressure block 26 faces the top surface of the sealing ring 22 , further restricting 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 portion 261 and a guide portion 262 . The inner diameter of the guide part 262 is greater than the inner diameter of the base part 261 . When the end of the lower section 311 abuts against the first sealing portion 221 of the sealing ring 22 , the lower section 311 of the valve core 31 has an inner bushing 25 and a pressure block 26 . It is loosely fitted with the base portion 261 of the A loose fit here means that, in an ideal state, the valve core 31 has a loose fit with the inner bushing 25 and the pressure block 26 to avoid interference. However, considering factors such as assembly and machining, there may be undesirable situations in which the valve core 31 interferes with the inner bushing 25 or pressure block 26 instead of forming a loose fit. In addition, the inner diameter of the guide portion 262 gradually increases from bottom to top. That is, the inner hole of the guide part 262 gradually expands from the bottom to the top. As such, 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 against 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.

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

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

As shown in FIGS. 5A and 5B , when the fluid with 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 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 also helps to reduce internal leakage when the electric valve is closed and helps 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, D1*(D2-D3) >= 6 mm ² . There are three situations that can cause (D2-D3) to increase. First, D2 remains the same and D3 decreases. Second, D2 increases and D3 remains the same. Third, both D2 and D3 increase.

If D2 remains the same and D3 decreases, F _forward is essentially the same and F _reverse increases. That is, when the fluid flows in the forward direction, in this case, the opening/closing operation of the electric valve is hardly affected. When the fluid flows in the reverse direction, the opening resistance of the electric valve increases, which does not help the reliability of opening the electric valve when the fluid flows in the reverse direction, and the larger the value of D2-D3, the greater the side effect.

If D2 increases and D3 stays the same, F _forward increases and F _reverse stays the same by default. 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 opening the electric valve 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 has little effect on the opening/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 opening the electric valve 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 helps the opening action of the electric valve.

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

This design is also advantageous for serialization of products. That is, when D1 is determined, the value range of D2-D3 may be calculated through the 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 numerical relationship.

It should be noted that, based on the description of the above technical solution, 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 bidirectional 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 sealing assembly is a part of the sealing seat part, and the valve core part is slidingly fitted with the sealing assembly. The valve core includes a second sealing portion. A detailed description is given below.

6-8 , the valve seat component 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 partially shown in the figure). The sealing assembly is fixed or confined 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 abuts against an inner wall of the body portion 312E, and the sealing ring 35E includes a bushing 121E. ) against 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 axial projection 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 the present 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. Accordingly, this embodiment also has the same advantageous effects as the first embodiment, which can be understood with reference to the first embodiment and will not be repeated here. More specifically, in the present 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; 10 is a partial schematic structural diagram of the electric valve of FIG.

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 modification of the lower section of the first embodiment are also applicable to the solenoid valve. The solenoid valve can also achieve the same function of reducing the internal leakage when the electric valve is closed as in the above-described embodiment, and other structures of the solenoid valve can be designed with reference to the above-described embodiment, and the design is also described herein. may be modified within the framework of the principle of , which will not be repeated here.

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

Claims (19)

An electric valve comprising a valve body component, a valve seat component, and a valve core component disposed in an interior chamber of the valve body component, the valve core component comprising a valve core, the valve core being substantially tubular, and the valve core includes a body portion and a lower section, the lower section being substantially annular;
wherein 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 comprises a bushing part;
the valve core part includes a second sealing part, the valve core part is slidingly 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 positioned above the valve core part, the valve core part includes an equalization flow path, and when the lower section abuts on the first sealing part, the first chamber is It communicates with the first fluid port of the electric valve through the equalization flow path,
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, a first obtuse angle θ is formed between the outer wall of the lower section and the cross section 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, 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,
the diameter of the axial projection circular line of the outer edge of the second sealing part 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 are 0.2 mm ² ≤ D1*(D2- D3) Electric valves, satisfying the relation ≤ 6 mm ^{2 .} The electric valve according to claim 1, which satisfies the relationship of ^{1 mm 2} ≤ D1*(D2-D3) ≤ 6 mm ^{2 .} 3. The valve seat component according to claim 1 or 2, wherein the valve seat part comprises a sealing ring, the sealing ring is made of a soft material, the sealing ring comprises the first sealing part, and the end of the lower section comprises: configured to abut or separate from the first sealing portion to enable or not communicate with the second fluid port of the electric valve, wherein the valve is 0.1 mm < D2-D3 < 0.6 mm To meet the relationship of the electric valve. 3. The valve seat component according to claim 1 or 2, wherein the valve seat part comprises a sealing ring, the sealing ring is made of a soft material, the sealing ring comprises the first sealing part, and the end of the lower section comprises: configured to abut against or separate from the first sealing portion to enable or not communicate with the second fluid port of the electric valve, the height L of the lower section being at least 0.4 mm , electric valve. 3. The valve seat component according to claim 1 or 2, wherein the valve seat part comprises a sealing ring, the sealing ring is made of a soft material, the sealing ring comprises the first sealing part, and the end of the lower section comprises: configured to abut or separate from the first sealing portion to allow or not communicate with the second fluid port of the electric valve, wherein 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. 6. The electric valve according to claim 3 or 5, satisfying 0.05 mm ≤ D2-D3 < 0.6 mm. 5. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion comprising 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 inner diameter of the lower end of the section. 5. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion comprising a first transition section connected to the lower section, wherein the outer diameter of the upper end of the first transition section is the first transition An electric valve greater than the outer diameter of the lower end of the section. 5. The method of claim 4, wherein a transition portion is provided between the body portion and the lower section, the transition portion comprising 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. less than an inner diameter of the lower end of the section, and an outer diameter of the upper end of the first transition section greater than an outer diameter of the lower end of the first transition section. 3. The method according to claim 1 or 2, wherein a transition portion is provided between the body portion and the lower section, the transition portion comprising a second transition section connected to the body portion, wherein the inner diameter of the upper end of the section of the second transition is less than an inner diameter of the lower end of the second transition section, an outer diameter of the upper end of the second transition section is less than an 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 greater than the inner diameter of the lower section. 11. The valve core component of any preceding claim, wherein the valve core component further comprises a sealing assembly, the bushing component comprising a first substantially tubular tubular portion, the sealing assembly comprising an outer wall of the valve core. and an inner wall of the first tubular portion, wherein the sealing assembly includes the second sealing portion, the second sealing portion being in sliding fit with the inner wall of the first tubular portion. 12. The gasket of claim 11, wherein the sealing assembly includes a sealing ring and a gasket, the body portion includes a small-diameter section and a large-diameter section, and the sealing ring is provided between the gasket and the small-diameter section, the gasket comprises the second sealing part, the valve body part further comprises a valve body, the bushing part comprising a bushing fixed to the valve body by welding, the bushing comprising the first tubular part; wherein the first tubular portion has a substantially 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. 11. The method according to any one of claims 1 to 10, wherein the bushing part comprises a bushing and a sealing assembly, the valve body part further comprises a valve body, the bushing being secured to the valve body by welding and , the bushing includes a second tubular portion, the sealing assembly abuts between the inner wall of the second tubular portion and the outer wall of the body portion, the body portion has a substantially uniform outer diameter, and the body portion includes the second sealing portion wherein the diameter of the axial projection circular line of the outer wall of the body portion on the valve core is D1. 14. The electrical circuit of claim 13, wherein the sealing assembly includes a sealing ring and a gasket, the sealing ring being provided between the gasket and the second tubular portion, and at least a portion of the gasket abutting against the outer wall of the body portion. valve. 11. The valve seat component according to any one of the preceding claims, wherein the valve seat component further comprises an inner bushing and a pressure block, the valve seat comprising an axial through-hole, wherein at least a portion of the inner bushing comprises the shaft disposed in the directional through-hole, wherein the sealing ring is disposed between the outside of the inner bushing and the valve seat, wherein the valve seat includes a first step, and a lower surface of the pressure block includes the first step and/or or an electric valve that abuts against the sealing ring. The method according to claim 15, wherein the valve seat is fixed to the pressure block by crimping, and the pressure block includes a base portion abutting against the sealing ring and a guide portion disposed above the base portion, and the inner diameter of the guide portion is gradually increasing from bottom to top,
when the end of the lower section abuts against the sealing ring, the lower section loosely fits the inner bushing and the base portion. 11. An electric valve according to any one of the preceding claims, wherein the lower end of the longitudinal section of the lower section is substantially arc-shaped. The electric valve according to any one of claims 1 to 10, wherein the electric valve is an electromagnetic expansion valve or a solenoid valve. The electric valve according to claim 18, wherein the electromagnetic expansion valve is a two-way electromagnetic expansion valve, and the solenoid valve is a two-way solenoid valve.

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