Proportional direction valve bush fixing structure

Abstract

The utility model provides a kind of proportional reversing valve bush fixing structure, comprising: proportional electromagnet, valve body and valve sleeve;Valve sleeve is installed in the inside of valve body;Valve body and valve sleeve are in transition cooperation or slightly interference fit state, under the slightly interference fit state, the interference amount of valve body and valve sleeve is less than preset value;Proportional electromagnet is installed in the first side of valve body and valve sleeve, and the end of valve sleeve first side is against the end surface of proportional electromagnet.This valve sleeve fixing structure reduces interference amount, makes the installation and disassembly process of valve sleeve more simple, effectively improves installation efficiency;By adopting the valve sleeve fixing structure of mechanical fixing mode, it can ensure that zero is permanent and reliable;Reduce the requirement to valve sleeve and valve body shape tolerance, so that it is easier to process;Under the premise of guaranteeing sealing, reduce interference amount, reduce deformation stress, and then improve service life;Disassembly and replacement are convenient, and the cost of waste valve body due to replacement is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of proportional directional valves, specifically, it relates to a valve sleeve fixing structure for a proportional directional valve. More particularly, it relates to a valve sleeve fixing structure for a high-frequency response proportional directional valve. Background Technology

[0002] A high-frequency response proportional directional valve is an electro-hydraulic control component that combines the continuous regulation capability of a proportional valve with the rapid response characteristics of a servo valve. It is primarily used in hydraulic systems requiring precise and rapid control of flow and direction. As the usage of this valve continues to increase, the demand for quick and low-cost assembly, maintenance, and replacement of parts is becoming increasingly apparent.

[0003] The disadvantages of the existing valve sleeve fixing structure are: 1. In order to ensure the stability of the mechanical zero position, the valve sleeve and valve body adopt a large interference fit, which means that the valve sleeve needs to be cold assembled, resulting in low assembly efficiency; 2. At the same time, interference stress exists in the valve sleeve and valve body, which will reduce the service life.

[0004] 3. A larger interference fit requires higher dimensional and positional tolerances in the machining of parts; otherwise, uneven deformation will cause the valve core to jam.

[0005] 4. During maintenance, it is basically impossible to disassemble the valve sleeve intact, and it can only be scrapped along with the valve body, which increases costs.

[0006] Patent document CN106352146A discloses an electromagnetic proportional valve, including a valve body and a proportional electromagnet. The valve body has a central hole, and a sleeve is installed inside the central hole. An end cap is installed at one end of the central hole, and the proportional electromagnet is fixed at the other end. A valve core is installed inside the sleeve, and a spring is installed between the valve core and the end cap. The proportional electromagnet controls the movement of the valve core within the sleeve. By adding a sleeve between the valve body and the valve core, friction occurs between the valve core and the sleeve during use, without damaging the valve body. When the valve core or the sleeve is damaged, it can be simply removed from the valve body and replaced, without replacing the entire proportional valve, thus saving on usage and maintenance costs.

[0007] However, patent document CN106352146A only uses a common detachable sleeve, which achieves a stable connection with the valve body through a common interference fit. Due to its large interference fit, the installation and disassembly process is complicated, resulting in low installation efficiency. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a valve sleeve fixing structure for a proportional directional valve.

[0009] According to the present invention, a proportional directional valve sleeve fixing structure includes: a proportional electromagnet 2, a valve body 3, and a valve sleeve 6. Valve sleeve 6 is installed inside valve body 3; The valve body 3 and the valve sleeve 6 are in a transition fit or a slight interference fit state. In the slight interference fit state, the interference between the valve body 3 and the valve sleeve 6 is less than a preset value, making it easy to remove the valve sleeve 6 from the valve body 3. The proportional electromagnet 2 is detachably installed on the first side of the valve body 3 and the valve sleeve 6. The end of the valve sleeve 6 on the first side abuts against the end face of the proportional electromagnet 2, so that the valve sleeve 6 is fixedly connected to the valve body 3.

[0010] Preferably, the valve sleeve 6 has a radially protruding positioning step 62 at the end of the first side, and the valve body 3 has a recessed positioning groove 33 at the end of the first side. When the proportional electromagnet 2 is installed on the valve body 3, the end face of the first side of the positioning step 62 abuts against the end face of the proportional electromagnet 2, and the end face of the second side of the positioning step 62 abuts against the end face of the positioning groove 33.

[0011] Preferably, a gap is formed between the end face of the proportional electromagnet 2 and the end face of the first side of the valve body 3.

[0012] Preferably, it further includes: a first sealing ring 8; A first sealing groove 32 is provided at the bottom of the positioning groove 33 on the valve body 3, and a first sealing ring 8 is provided in the first sealing groove 32. When the valve sleeve 6 is installed on the valve body 3, the first sealing ring 8 is sandwiched between the end face of the first sealing groove 32 and the end face of the second side of the positioning step 62.

[0013] Preferably, it further includes: a second sealing ring 9; The first side end face of the positioning step 62 is provided with a second sealing groove 63, and the second sealing ring 9 is disposed in the second sealing groove 63. When the proportional electromagnet 2 is installed on the valve body 3, the second sealing ring 9 is sandwiched between the end face of the second sealing groove 63 and the end face of the proportional electromagnet 2.

[0014] Preferably, when the valve body 3 and the valve sleeve 6 are in a transition fit or slightly interference fit state, the sealing between the valve sleeve 6 and the valve body 3 can be guaranteed.

[0015] Preferably, it also includes: amplifier 1, end cap 4, spring 5 and valve core 7; The valve sleeve 6 is equipped with a throttling window, and the proportional electromagnet 2 has a built-in displacement sensor. Amplifier 1 is mounted on proportional electromagnet 2. Amplifier 1 is configured to receive input electrical signals and output drive current to proportional electromagnet 2, and the output current can be dynamically adjusted through closed-loop control. The valve core 7 is slidably connected to the inner side of the valve sleeve 6. The displacement of the valve core 7 can change the opening of the throttling window on the valve sleeve 6 to control the flow rate or pressure of the hydraulic oil flowing through the flow channel of the valve body 3. End cap 4 is fixedly installed on the second side of valve body 3; Spring 5 and valve core 7 are arranged along the same axis. One end of spring 5 abuts against the inside of end cover 4, and the other end of spring 5 abuts against the first end of valve core 7. Spring 5 is pre-pressed on end cover 4, and forms a force balance with the electromagnetic force of proportional electromagnet 2 to assist valve core 7 in positioning. The second end of the valve core 7 is fixedly connected to the output shaft of the proportional electromagnet 2. The output shaft can extend and shorten along the axial direction. The proportional electromagnet 2 can generate a thrust proportional to the driving current to drive the valve core 7 to move. When the output shaft extends and retracts, the valve core 7 moves synchronously in the valve sleeve 6. The displacement sensor inside the proportional electromagnet 2 can detect the actual position of the valve core 7 in real time and feed it back to the amplifier 1 to achieve proportional control of flow or pressure.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By reducing the interference fit, the installation and disassembly process of the valve sleeve is made simpler, effectively improving installation efficiency; 2. The valve sleeve fixing structure, which adopts a mechanical fixing method, can ensure permanent and reliable zero position; 3. The requirements for the form and position tolerances of the valve sleeve and valve body have been reduced, making them easier to process; 4. While ensuring sealing, reduce the interference fit to lower deformation stress and thus improve service life; 5. Easy to disassemble and replace, reducing the cost of wasting valve bodies due to replacement. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the valve sleeve fixing structure of a conventional high-frequency response proportional directional valve in the background art of this utility model; Figure 2 This is a schematic diagram of the valve sleeve fixing structure of the high-frequency response proportional directional valve in this embodiment of the present invention; Figure 3 This is a schematic diagram of the valve body structure of a conventional high-frequency response proportional directional valve in the background art of this utility model. Figure 4 This is a schematic diagram of the valve body structure of the high-frequency response proportional directional valve in this embodiment of the present invention. Figure 5 This is a schematic diagram of the valve sleeve structure of a conventional high-frequency response proportional directional valve in the background art of this utility model; Figure 6 This is a schematic diagram of the valve sleeve structure of the high-frequency response proportional directional valve in this embodiment of the present invention. The diagram shows: Detailed Implementation

[0018] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0019] like Figure 2 , Figure 4 , Figure 6 The present invention provides a valve sleeve fixing structure for a high-frequency response proportional directional valve, comprising an amplifier 1, a proportional electromagnet 2, a valve body 3, an end cap 4, a spring 5, a valve sleeve 6, a valve core 7, a first sealing ring 8, and a second sealing ring 9. The difference from conventional structures lies in the valve body 3, the valve sleeve 6, the first sealing ring 8, and the second sealing ring 9.

[0020] The valve body 3 and the valve sleeve 6 are in a transition fit or a slight interference fit state, provided that the sealing requirements between the valve sleeve 6 and the valve body 3 can still be guaranteed. In the slight interference fit state, the interference between the valve body 3 and the valve sleeve 6 is less than a preset value, which makes the valve sleeve 6 easy to disassemble from the valve body 3 and simplifies the assembly process.

[0021] exist Figure 2 , Figure 4 and Figure 6 In the figure, the first side of valve sleeve 6 and valve body 3 refers to their respective right sides.

[0022] The valve sleeve 6 has a positioning step 62 at its right end, and the valve body 3 has a positioning groove 33 at its right end. The positioning step 62 protrudes radially outward, while the positioning groove 33 is concave inward. The positioning step 62 fits into the positioning groove 33 at the right end of the valve body 3. Specifically, the positioning step 62 has a first end face facing the right and a second end face facing the left, wherein the first end face of the positioning step 62 abuts against the left end face of the proportional electromagnet 2, and the second end face of the positioning step 62 abuts against the end face of the positioning groove 33.

[0023] The proportional electromagnet 2 is detachably mounted on the first side of the valve body 3 and the valve sleeve 6. The end of the valve sleeve 6 on the first side abuts against the end face of the proportional electromagnet 2, thus fixing the valve sleeve 6 to the valve body 3. Furthermore, there is a gap between the left end face of the proportional electromagnet 2 and the right end face of the valve body 3. The proportional electromagnet 2 has a built-in displacement sensor.

[0024] The valve sleeve 6 and the valve body 3 are provided with a first sealing ring 8 and a second sealing ring 9 at their right ends for sealing between the valve sleeve 6 and the valve body 3. The first sealing ring 8 is disposed in the first sealing groove 32 of the valve body 3, specifically, it is sandwiched between the second side end face of the positioning step 62 and the end face of the first sealing groove 32. The valve sleeve 6 is provided with a throttling window.

[0025] Amplifier 1 is mounted on proportional electromagnet 2 and is used to control the operation of proportional electromagnet 2. Amplifier 1 can receive input electrical signals and output drive current to proportional electromagnet 2, and the output current can be dynamically adjusted through closed-loop control. Valve core 7 is slidably connected to the inside of valve sleeve 6 and can move axially within valve sleeve 6. The displacement of valve core 7 can change its opening relative to the throttling window on valve sleeve 6, thereby controlling the flow rate or pressure of hydraulic oil flowing through the flow channel of valve body 3.

[0026] The end cap 4 is fixedly mounted on the second side of the valve body 3, that is... Figure 2 On the left side of the middle. Spring 5 and valve core 7 are arranged along the same axial direction. One end of spring 5 abuts against the inside of end cover 4, and the other end abuts against the first end of valve core 7. Figure 2 (Left end of the middle valve core 7).

[0027] Spring 5 is preloaded onto end cap 4, forming a force balance with the electromagnetic force of proportional electromagnet 2, thus playing a reset role to assist in positioning valve core 7. Figure 2 The right end of the valve core 7 is fixedly connected to the output shaft of the proportional electromagnet 2, which can extend and shorten along the axial direction.

[0028] The proportional electromagnet 2 generates a thrust proportional to the driving current to move the valve core 7. When the output shaft extends and retracts, the valve core 7 moves synchronously within the valve sleeve 6. The displacement sensor inside the proportional electromagnet 2 can detect the actual position of the valve core 7 in real time and feed it back to the amplifier 1 to achieve fast and high-precision proportional control of flow or pressure.

[0029] This fixing structure uses a mechanical fixing method, ensuring permanent and reliable zero-position control; it reduces interference while maintaining a tight seal, thereby lowering deformation stress and extending service life; it reduces the requirements for the form and position tolerances of the valve sleeve and valve body, making it easier to process; it is convenient to install, improving installation efficiency; and it is easy to disassemble and replace, reducing the cost of wasting valve body parts.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A valve sleeve fixing structure for a proportional directional valve, characterized in that, include: Proportional electromagnet (2), valve body (3) and valve sleeve (6); The valve sleeve (6) is installed inside the valve body (3); The valve body (3) and the valve sleeve (6) are in a transition fit or a slight interference fit state. In the slight interference fit state, the interference of the valve body (3) and the valve sleeve (6) is less than a preset value, making it easy to remove the valve sleeve (6) from the valve body (3). The proportional electromagnet (2) is detachably installed on the first side of the valve body (3) and the valve sleeve (6). The end of the first side of the valve sleeve (6) abuts against the end face of the proportional electromagnet (2), so that the valve sleeve (6) is fixedly connected to the valve body (3).

2. The proportional directional valve sleeve fixing structure according to claim 1, characterized in that, The valve sleeve (6) has a radially protruding positioning step (62) at the end of the first side, and the valve body (3) has a recessed positioning groove (33) at the end of the first side. When the proportional electromagnet (2) is installed on the valve body (3), the end face of the first side of the positioning step (62) abuts against the end face of the proportional electromagnet (2), and the end face of the second side of the positioning step (62) abuts against the end face of the positioning groove (33).

3. The proportional directional valve sleeve fixing structure according to claim 2, characterized in that, A gap is formed between the end face of the proportional electromagnet (2) and the end face of the first side of the valve body (3).

4. The proportional directional valve sleeve fixing structure according to claim 2, characterized in that, Also includes: First sealing ring (8); A first sealing groove (32) is provided at the bottom of the positioning groove (33) on the valve body (3), and a first sealing ring (8) is provided in the first sealing groove (32). When the valve sleeve (6) is installed on the valve body (3), the first sealing ring (8) is sandwiched between the end face of the first sealing groove (32) and the end face of the second side of the positioning step (62).

5. The proportional directional valve sleeve fixing structure according to claim 2, characterized in that, Also includes: Second sealing ring (9); The first side end face of the positioning step (62) is provided with a second sealing groove (63), and the second sealing ring (9) is set in the second sealing groove (63). When the proportional electromagnet (2) is installed on the valve body (3), the second sealing ring (9) is sandwiched between the end face of the second sealing groove (63) and the end face of the proportional electromagnet (2).

6. The proportional directional valve sleeve fixing structure according to claim 1, characterized in that, When the valve body (3) and valve sleeve (6) are in a transition fit or slight interference fit state, the sealing between the valve sleeve (6) and valve body (3) can be guaranteed.

7. The proportional directional valve sleeve fixing structure according to claim 1, characterized in that, Also includes: Amplifier (1), end cap (4), spring (5) and valve core (7); The valve sleeve (6) is provided with a throttling window, and the proportional electromagnet (2) has a built-in displacement sensor; The amplifier (1) is placed on the proportional electromagnet (2). The amplifier (1) is configured to receive the input electrical signal and output the driving current to the proportional electromagnet (2), and the output current can be dynamically adjusted through closed-loop control. The valve core (7) is slidably connected to the inside of the valve sleeve (6). The displacement of the valve core (7) can change the opening of the throttling window on the valve sleeve (6) to control the flow rate or pressure of the hydraulic oil flowing through the flow channel of the valve body (3). The end cap (4) is fixedly installed on the second side of the valve body (3); The spring (5) and the valve core (7) are arranged along the same axis. One end of the spring (5) abuts against the inside of the end cover (4), and the other end of the spring (5) abuts against the first end of the valve core (7). The spring (5) is pre-pressed on the end cover (4) and forms a force balance with the electromagnetic force of the proportional electromagnet (2) to assist the valve core (7) in positioning. The second end of the valve core (7) is fixedly connected to the output shaft of the proportional electromagnet (2). The output shaft can extend and shorten along the axial direction. The proportional electromagnet (2) can generate a thrust proportional to the driving current to drive the valve core (7) to move. When the output shaft extends and shortens, the valve core (7) moves synchronously in the valve sleeve (6). The displacement sensor in the proportional electromagnet (2) can detect the actual position of the valve core (7) in real time and feed it back to the amplifier (1) to achieve proportional control of flow or pressure.

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