Control valve

Abstract

The control valve comprises a first valve element and a second valve element, the first valve element comprises a main body part, an elastic piece and a valve port part, the main body part is provided with a through hole, the valve port part is located in the through hole, and the valve port part is in sealing sliding fit with a wall part corresponding to the through hole; according to the technical scheme, the elastic device is additionally arranged at the bottom of the first valve element, when the second valve element and the valve port part are in contact sealing, upward buffering is provided for the second valve element, and therefore the sealing performance of the second valve element is improved. Meanwhile, the friction force generated by the sealing sliding fit between the valve port part and the wall part corresponding to the through hole can reduce the abrasion of the second valve element and the valve port part in the further fit contact process.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and particularly to a control valve. Background Art

[0002] Traditional double-spool control valves usually have two valve ports to achieve two-stage flow regulation. The small valve needle precisely controls the flow rate, and the large valve needle ensures a large flow rate and a large opening degree in the fully open state.

[0003] Traditional control valves are composed of a large valve needle, a small valve needle, etc. The small valve needle cooperates with the valve port part of the large valve needle at a certain speed driven by a screw rod assembly. Both the small valve needle and the valve port part of the large valve needle are prone to impact wear. After long-term use, there will be a risk of fluid leakage and poor sealing. Summary of the Invention

[0004] The present invention aims to propose a control valve that reduces the impact wear between the first spool and the second spool when closing the valve and extends the service life of the second spool.

[0005] A control valve includes: a first spool and a second spool. The first spool includes a main body part, an elastic member, and a valve port part. The main body part has a through hole. At least a part of the second spool is located in the through hole. The valve port part is located in the through hole, and a sealing and slidable fit is provided between the valve port part and the wall part corresponding to the through hole. The second spool can move relative to the valve port part along the axial direction of the second spool. The valve port part has a first end and a second end along the axial direction of the second spool. The first end is closer to the second spool than the second end. The valve port part has a through hole. One end of the elastic member abuts or is fixed to the second end of the valve port part, and the other end of the elastic member abuts or is fixed to the main body part. When the second spool is in the closed position, at least a part of the second spool cooperates with the wall part corresponding to the through hole, and the elastic member is in a compressed state.

[0006] The above technical solution has the following technical effects: When the second spool is in the closed position, the elastic member gives a downward buffer to the valve port part, reducing the wear caused by the impact between the second spool and the valve port part when closing the valve. Brief Description of the Drawings

[0007] Through the following description with reference to the drawings, the features and advantages of one or more embodiments of the present invention will become more easily understood. In the drawings:

[0008] Figure 1 is an overall cross-sectional schematic diagram of an embodiment of a control valve;

[0009] Figure 2 is a schematic diagram of an embodiment of the first spool;

[0010] Figure 3 It is a schematic diagram of another embodiment of the first valve core;

[0011] Figure 4 It is a schematic diagram of an embodiment of the valve port part;

[0012] Figure 5 It is a schematic diagram of an embodiment of the second part and the protruding part;

[0013] Figure 6 It is a schematic diagram of another embodiment of the valve port part;

[0014] Figure 7 It is a schematic diagram of another embodiment of the second part and the protruding part;

[0015] Reference numerals:

[0016] 1. First valve core; 2. Second valve core; 3. Valve port part; 30. First end; 31. Second end; 310. First limit groove; 32. Third limit groove; 33. Through hole; 4. Sealing ring; 5. Elastic member; 6. Main body part; 7. Through hole; 8. Base; 810. First part; 811. Second part; 91. Protruding part; 910. Second limit groove; 911. Central hole; 10. Lead screw assembly; 11: Large spring; 12. First valve core sleeve; 13. Valve body. Specific embodiments

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the invention.

[0018] As Figure 1 shown, Figure 1 A control valve is schematically shown. The control valve includes a first valve core 1, a second valve core 2, a lead screw assembly 10, a large spring 11, a first valve core sleeve 12, and a valve body 13. The first valve core 1 includes a main body part 6, an elastic member 5, and a valve port part 3.

[0019] The main body 6 has a through hole 7, at least part of the second valve core 2 is located in the through hole 7, the valve port part 3 is located in the through hole 7, and a sealing and slidable fit is provided between the valve port part 3 and the wall part corresponding to the through hole 7; the second valve core 2 can move relative to the valve port part 3 along the axial direction of the second valve core 2. The valve port part 3 has a first end 30 and a second end 31 along the axial direction of the second valve core 2. The first end 30 is closer to the second valve core 2 than the second end 31. The valve port part 3 has a through hole 33. One end of the elastic member 5 abuts against or is fixed to the second end 31 of the valve port part 3, and the other end of the elastic member 5 abuts against or is fixed to the main body 6. When the second valve core 2 is in the closed position, the second valve core 2 cooperates with the wall part corresponding to the through hole 33, and the elastic member 5 is in a compressed state.

[0020] During the valve closing process of the second valve core 2, the lead screw assembly 10 drives the second valve core 2 to move axially towards the valve port part 3. When the second valve core 2 contacts the wall part corresponding to the through hole 33 of the valve port part 3, the valve port part 3 continues to move axially, the elastic member 5 is in a compressed state, and the elastic member 5 gives a buffer to the valve port part 3 during the downward movement of the valve port part 3; the large spring 11 is always in a compressed state. While the second valve core 2 moves downward, the large spring 11 gives a force in the axial direction to the first valve core 1 through the first valve core sleeve 12, so that the first valve core 1 abuts against the valve body 13, realizing the valve closing of the first valve core 1.

[0021] During the valve opening process of the second valve core 2, the second valve core 2 disengages from the wall part corresponding to the through hole 33, and the second valve core 2 moves towards the direction where the large spring 11 is located. After the second valve core 2 contacts the first valve core sleeve 12, the second valve core 2 continues to move upward. Since the first valve core sleeve 12 is fixed to the first valve core 1, the first valve core sleeve 12 drives the first valve core 1 to move towards the direction where the large spring 11 is located, thereby realizing the valve opening of the first valve core 1.

[0022] When the second valve core 2 is in the open position, the length of the elastic member 5 is L1, and when the second valve core 2 is in the closed position, the length of the elastic member 5 is L2, where L1 > L2.

[0023] It can be seen that the elastic member 5 is further compressed by the valve port part 3 and gives a buffer during the downward movement of the valve port part 3, reducing the wear between the second valve core 2 and the valve port part 3 during the further mating contact process.

[0024] Combined Figure 1 and Figure 2 as shownFigure 1 As an embodiment of the first valve core 1, the elastic member 5 extends along the axial direction of the second valve core 2. The main body portion 6 includes a base portion 8 and an extending portion 91. The extending portion 91 protrudes relative to the base portion 8 toward the axis direction of the through hole 7. At least a part of the elastic member 5 is located between the valve port portion 3 and the extending portion 91. One end of the elastic member 5 abuts or is fixed to the second end portion 31, and the other end of the elastic member 5 abuts or is fixed to the extending portion 91. By limiting the elastic member 5 between the extending portion 91 and the valve port portion 3, when the valve port portion 3 is acted on by the first valve core 1, the extending portion 91 can effectively bear the support of the elastic member 5 to provide a buffering effect for the valve port portion 3.

[0025] In this article, the axis direction of the through hole 7 refers to the center line of the through hole 7, or when it has a non-circular structure, the axis refers to the extension line in the axial direction of the second valve core 2 of the connection line of the center points between its two farthest sides.

[0026] Specifically, when the number of the elastic members 5 is 1, the elastic member 5 is located between the valve port portion 3 and the extending portion 91, and the central axis of the elastic member 5 passes through the through hole 7; when the number of the elastic members 5 is more than 1, the elastic members 5 are located between the valve port portion 3 and the extending portion 91 and are arranged circumferentially along the hole wall corresponding to the through hole 7. At this time, the central axis of the elastic member 5 passes through the extending portion 91;

[0027] In addition, one end of the elastic member 5 abuts against the second end portion 31 and the other end of the elastic member 5 abuts against the extending portion 91. This installation method of the elastic member 5 is simple and saves installation time.

[0028] One end of the elastic member 5 abuts against the second end portion 31 and the other end of the elastic member 5 is fixed to the extending portion 91; one end of the elastic member 5 is fixed to the second end portion 31 and the other end of the elastic member 5 abuts against the extending portion 91; the way that one end of the elastic member 5 is fixed and the other end abuts can improve the stability of the overall device.

[0029] One end of the elastic member 5 is fixed to the second end portion 31 and the other end of the elastic member 5 is fixed to the extending portion 91. The way that both ends of the elastic member 5 are fixed makes the stability of the overall device better.

[0030] Combined Figure 3 、 Figure 4 、 Figure 5 As shown Figure 3Another embodiment of the valve core, the main body portion 6 includes a base portion 8 and an extending portion 91. The extending portion 91 protrudes relative to the base portion 8 in the axial direction of the through hole 7. The base portion 8 includes a first portion 810 and a second portion 811, and the first portion 810 and the second portion 811 are fixed by welding. One end of the elastic member 5 abuts against or is fixed to the second end portion 31 of the valve port portion 3, and the other end of the elastic member 5 abuts against or is fixed to the extending portion 91.

[0031] Specifically, the distance between the inner wall of the second portion 811 and the axis of the through hole 7 is not less than the distance between the outer side wall of the valve port portion 3 and the axis of the through hole 7, ensuring that when the second valve core 2 closes the valve, the valve port portion 3 can slide freely along the corresponding hole wall of the through hole 7.

[0032] More specifically, the extending portion 91 is an annular body, the extending portion 91 includes a central hole 911, the central hole 911 is a part of the through hole 7, and the cross-sectional area of the central hole 911 is not less than the cross-sectional area of the through hole 33 of the valve port portion 3. Such a setting ensures that when the fluid passes from the through hole 33 of the valve port portion 3 through the through hole 7 into other channels, the flow rate through the central hole 911 is not affected.

[0033] As Figure 4 shown, the valve port portion 3 includes a third limiting groove 32. The third limiting groove 32 is an annular groove in the circumferential direction of the valve port portion 3. The first valve core 1 further includes a sealing ring 4. At least a part of the sealing ring 4 is located in the third limiting groove 32. The sealing ring 4 is limited between the wall portion of the valve port portion 3 corresponding to the through hole 7. The number of the third limiting grooves 32 is not more than 2, and the number of the sealing rings 4 is the same as the number of the third limiting grooves 32. When the second valve core 2 is in the closed position, the fluid will be distributed between the outer peripheral wall of the valve port portion 3 and the corresponding side wall of the through hole 7, and the sealing ring 4 prevents the fluid from passing through and prevents fluid leakage.

[0034] As Figure 6 、 Figure 7 and combined with Figure 1 shown, the second end portion 31 has a first limiting groove 310. One end of the elastic member 5 is located in the first limiting groove 310 and is limited by the bottom wall corresponding to the first limiting groove 310; and / or one side of the extending portion 91 facing the second end portion 31 has a second limiting groove 910. The other end of the elastic member 5 is located in the second limiting groove 910 and is limited by the bottom wall corresponding to the second limiting groove 910. By setting the limiting groove to limit the elastic member 5, the elastic member 5 is more stable in the circumferential direction.

[0035] Specifically, one end of the elastic member 5 is limited by the bottom wall corresponding to the first limiting groove 310, and the other end of the elastic member 5 is limited by the bottom wall corresponding to the second limiting groove 910; alternatively, in another embodiment, one end of the elastic member 5 is limited by the bottom wall corresponding to the first limiting groove 310, and the other end of the elastic member 5 abuts against or is fixed to the protruding portion 91; or as another embodiment, one end of the elastic member 5 abuts against or is fixed to the second end portion 31, and the other end of the elastic member 5 is limited by the bottom wall corresponding to the second limiting groove 910.

[0036] In addition, the axial height of the protruding portion 91 is greater than the axial depth of the second limiting groove 910. Thus, when the second limiting groove 910 is machined, the protruding portion 91 is not penetrated in the axial direction, and the bottom wall of the second limiting groove 910 can still limit the elastic member 5.

[0037] Specifically, driven by the internal components of the control valve, the second valve core 2 can move up and down in the axial direction. When the second valve core 2 moves downward, it contacts the wall portion corresponding to the through hole 33 of the valve port portion 3. The second valve core 2 moves downward slowly, and the second valve core 2 further cooperates with the wall portion corresponding to the through hole 33 of the valve port portion 3. At the same time, the valve port portion 3 and the sealing ring 4 move downward as a whole. The elastic member 5 is in a compressed state, and the sealing ring 4 contacts the hole wall corresponding to the through hole 7 to prevent fluid leakage. The elastic member 5 is further compressed by the valve port portion 3, providing buffering during the downward movement of the valve port portion 3 and reducing the wear between the second valve core 2 and the valve port portion 3 during further mating contact.

[0038] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. For example, the definition of directions such as "front", "rear", "left", "right", "up", and "down". Although the present invention has been described in detail with reference to the above embodiments in this specification, those of ordinary skill in the art should understand that those skilled in the art can still combine, modify, or equivalently replace the present invention. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control valve, characterized in that, Comprising: A first valve core (1) and a second valve core (2), the first valve core (1) includes a main body portion (6), an elastic member (5), and a valve port portion (3). The main body portion (6) has a through hole (7). At least a part of the second valve core (2) is located in the through hole (7). The valve port portion (3) is located in the through hole (7), and a sealing and slidable fit is provided between the valve port portion (3) and the corresponding wall portion of the through hole (7). The second valve core (2) can move relative to the valve port portion (3) along the axial direction of the second valve core (2). The valve port portion (3) has a first end (30) and a second end (31) along the axial direction of the second valve core (2). The first end (30) is closer to the second valve core (2) than the second end (31). The valve port portion (3) has a through hole (33). One end of the elastic member (5) abuts against or is fixed to the second end (31) of the valve port portion (3), and the other end of the elastic member (5) abuts against or is fixed to the main body portion (6). When the second valve core (2) is in the closed position, at least a part of the second valve core (2) cooperates with the wall portion corresponding to the through hole (33), and the elastic member (5) is in a compressed state.

2. The control valve according to claim 1, characterized in that, When the second valve core (2) is in the open position, the length of the elastic member (5) is L1. When the second valve core (2) is in the closed position, the length of the elastic member (5) is L2, where L1 > L2.

3. The control valve according to claim 1, characterized in that, The elastic member (5) extends along the axial direction of the second valve core (2). The main body portion (6) includes a base portion (8) and a protruding portion (91). The protruding portion (91) protrudes towards the axis direction of the through hole (7) relative to the base portion (8). At least a part of the elastic member (5) is located between the valve port portion (3) and the protruding portion (91). One end of the elastic member (5) abuts against or is fixed to the second end (31), and the other end of the elastic member (5) abuts against or is fixed to the protruding portion (91).

4. The control valve according to claim 3, characterized in that, The second end (31) has a first limiting groove (310). One end of the elastic member (5) is located in the first limiting groove (310) and is limited by the bottom wall corresponding to the first limiting groove (310). And / or the side of the protruding portion (91) facing the second end (31) has a second limiting groove (910). The other end of the elastic member (5) is located in the second limiting groove (910) and is limited by the bottom wall corresponding to the second limiting groove (910).

5. The control valve according to claim 4, characterized in that, The axial height of the protruding portion (91) is greater than the axial depth of the second limiting groove (910).

6. The control valve according to any one of claims 1-5, wherein the valve port portion (3) includes a third limiting groove (32), the third limiting groove (32) is an annular groove in the circumferential direction of the valve port portion (3), the first valve core (1) further includes a sealing ring (4), at least a part of the sealing ring (4) is located in the third limiting groove (32), the sealing ring (4) is limited between the wall portion of the valve port portion (3) corresponding to the through hole (7), the number of the third limiting grooves (32) is not more than 2, and the number of the sealing rings (4) is the same as the number of the third limiting grooves (32).

7. The control valve according to claim 1, characterized in that, The main body portion (6) includes a base portion (8) and an extending portion (91). The extending portion (91) protrudes in the axial direction of the through hole (7) with respect to the base portion (8). The base portion (8) includes a first portion (810) and a second portion (811). The first portion (810) and the second portion (811) are fixed by welding. One end of the elastic member (5) abuts against or is fixed to the second end portion (31) of the valve port portion (3), and the other end of the elastic member (5) abuts against or is fixed to the extending portion (91).

8. The control valve according to claim 7, characterized in that, The distance between the inner wall of the second portion (811) and the axis of the through hole (7) is not less than the distance between the outer side wall of the valve port portion (3) and the axis of the through hole (7).

9. The control valve according to claim 7, characterized in that, The extending portion (91) is an annular body. The extending portion (91) includes a central hole (911). The central hole (911) is a part of the through hole (7). The cross-sectional area of the central hole (911) is not less than the cross-sectional area of the through hole (33) of the valve port portion (3).

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