Proportional directional valve flow passage structure

Abstract

The utility model provides a kind of proportional reversing valve flow passage structure, comprising: valve body and valve core;Two ends of valve body are equipped with first cavity and second cavity, and sliding hole is provided on valve body, and first cavity and second cavity only form communication path by sliding hole;Valve core is installed in sliding hole, and the radial surface of valve core seals sliding hole, to block first cavity and second cavity through sliding hole communication;The first end of valve core is located in first cavity, and the second end of valve core is located in second cavity;Valve core has axial flow passage and radial flow passage inside, and axial flow passage and radial flow passage communicate the first end and the second end of valve core, to communicate the first cavity and the second cavity of valve body.The design simplifies the casting flow passage structure inside valve body, improves the safety margin of valve body, and is more easily realized high pressure.

Description

Technical Field

[0001] This utility model belongs to the field of proportional directional valve technology, specifically, it relates to a flow channel structure of a proportional directional valve, and more particularly to a flow channel structure of a high-frequency response proportional directional valve. Background Technology

[0002] High-frequency response proportional directional valves, combining the continuous regulation of proportional valves with the rapid response of servo valves, are widely used in hydraulic systems requiring precise and rapid control of flow and direction. However, with the development of hydraulic systems towards higher pressure and faster response, current technology has revealed significant shortcomings: the safety margin between the casting flow channels of the proportional valve body is continuously decreasing, and the quality of the valve core is increasingly constraining its dynamic characteristics. In particular, the complex flow channel structure of existing proportional valves makes it difficult to meet the industry demands for higher pressure and faster response, necessitating optimization and improvement.

[0003] Patent document CN215445170U discloses a valve core structure for a proportional directional valve, belonging to the field of directional valve manufacturing. This invention is slidably installed within a housing, which includes a high-pressure oil port and at least one working oil port. A sliding hole is provided on the housing, and the valve core is fitted within the sliding hole, sealing the sliding hole through its radial surface. The valve core slides, creating a gap between its radial end face and the sliding hole, which connects the high-pressure oil port and the working oil port. When the valve core is in the neutral position, the surface in contact with the sliding hole is a shoulder sealing surface. A variable-diameter cone is provided on both sides of the shoulder sealing surface, and at least one throttling groove is formed on the radial surface of this variable-diameter cone. This invention uses a variable-diameter cone as the full-circumference flow opening of the valve core, and the throttling groove of the radial opening is located on the variable-diameter cone, making it highly suitable for applications requiring high flow control with small openings and low overflow pressure with large openings.

[0004] However, the proportional valve flow channel structure of patent document CN215445170U is relatively complex, which reduces the safety margin of the valve body and makes it difficult to meet the requirements of high pressure. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a proportional directional valve flow channel structure.

[0006] According to the present invention, a proportional reversing valve flow channel structure includes: a valve body 3 and a valve core 7; The valve body 3 has a first cavity 33 and a second cavity 34 at both ends, and a sliding hole 35 is provided on the valve body 3. The first cavity 33 and the second cavity 34 are connected only through the sliding hole 35. The valve core 7 is fitted inside the sliding hole 35, and the radial surface of the valve core 7 seals the sliding hole, thereby blocking the first cavity 33 and the second cavity 34 from communicating through the sliding hole 35; The valve core 7 has a through valve core flow channel inside, which forms a new connection path, so that the first cavity 33 and the second cavity 34 are connected to each other through the valve core flow channel.

[0007] Preferably, the first end of the valve core 7 extends into the first cavity 33 and the second end extends into the second cavity 34; The valve core flow channel has an axial opening at the first end of the valve core 7 and a radial opening at the second end of the valve core 7; The valve core flow channel includes an axial flow channel 71 and a radial flow channel 72, wherein: The axial flow channel 71 starts from the axial opening at the first end of the valve core 7 and connects to the first cavity 33, and extends along the axial direction of the valve core 7 to the second end of the valve core 7. The radial flow channel 72 is located at the second end of the valve core 7. The radial flow channel 72 connects to the axial flow channel 71 and connects to the second cavity 34 through the radial opening.

[0008] Preferably, it further includes: a proportional electromagnet 2 and a spring 5; The first end of the valve core 7 is connected to the valve body 3 via the spring 5, the proportional electromagnet 2 is fixedly connected to the valve body 3, and the second end of the valve core 7 is connected to the output end of the proportional electromagnet 2. When the proportional electromagnet 2 is energized, its output end can drive the valve core 7 to slide along the sliding hole 35. When the proportional electromagnet 2 is de-energized, the spring 5 can drive the valve core 7 to reset.

[0009] Preferably, it further includes: an end cap 4 and a valve sleeve 6; The proportional electromagnet 2 is fixedly connected to the end of the valve body 3 on the side where the second cavity 34 is located; The end cap 4 is fixedly connected to the end of the valve body 3 on the side where the first cavity 33 is located; One end of the spring 5 abuts against the first end of the valve core 7, and the other end is pre-pressed on the inside of the end cover 4. The elastic force of the spring 5 and the electromagnetic force of the proportional electromagnet 2 form a force balance, which is used to assist the valve core 7 in resetting. The valve sleeve 6 is fitted inside the sliding hole 35 and is fixedly connected to the valve body 3. The valve core 7 is fitted inside the valve sleeve 6. The valve core 7 and the valve sleeve 6 are tightly fitted and can slide relative to each other.

[0010] Preferably, it further includes: amplifier 1; The proportional electromagnet 2 is electrically connected to the amplifier 1. The amplifier 1 is used to receive the input electrical signal and output the drive current to the proportional electromagnet 2. The valve core 7 is moved by controlling the extension and retraction of the output end of the proportional electromagnet 2.

[0011] Preferably, the valve sleeve 6 is provided with a throttling window, and the displacement of the valve core 7 can change its opening with respect to the throttling window in order to control the flow rate or pressure of the hydraulic oil flowing through the flow channel of the valve body 3.

[0012] Preferably, the proportional electromagnet 2 has a built-in displacement sensor, which is electrically connected to the amplifier 1 to detect the actual position of the valve core 7 in real time and feed it back to the amplifier 1. The amplifier 1 dynamically adjusts the output current through closed-loop control, thereby accurately controlling the position of the valve core 7.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The internal casting flow channel structure of the valve body has been simplified, the safety margin of the valve body has been increased, and it is easier to achieve high pressure. 2. The valve core is lighter due to the internal flow channels, which improves its dynamic response performance. Attached Figure Description

[0014] 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 a conventional high-frequency response proportional directional valve in the background art of this utility model; Figure 2 A schematic diagram of the flow channel structure of the high-frequency response proportional directional valve according to a preferred 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 A schematic diagram of the valve body structure of the high-frequency response proportional directional valve according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram of the valve core 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 core structure of a high-frequency response proportional directional valve according to a preferred embodiment of the present invention.

[0015] The diagram shows: Detailed Implementation

[0016] 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.

[0017] Figure 2 , Figure 4 , Figure 6As shown, this utility model provides a flow channel structure for a high-frequency response proportional directional valve, including an amplifier 1, a proportional electromagnet 2, a valve body 3, an end cap 4, a spring 5, a valve sleeve 6, and a valve core 7. Compared with the conventional structure, the difference lies in the valve body 3 and the valve core 7; the remaining parts of the directional valve flow channel structure are the same as those in the conventional structure.

[0018] The valve body 3 has a first cavity 33 and a second cavity 34 at both ends. The first cavity 33 is located at the left end of the valve body 3 in the figure, and the second cavity 34 is located at the right end of the valve body 3. A sliding hole 35 is provided axially in the valve body 3 for assembling the valve core 7. The sliding hole 35 connects the first cavity 33 and the second cavity 34. In the prior art, the valve body 3 also connects the first cavity 33 and the second cavity 34 through a second flow channel 32 for the movement and breathing of the valve core 7. This utility model eliminates the second flow channel 32, retaining only the first flow channel 31 connecting the two annular grooves in the middle of the valve body 3.

[0019] The connection relationships of the various components of this utility model are as follows: A proportional electromagnet 2 is fixedly connected to the end of the valve body 3 where the second cavity 34 is located; an end cap 4 is fixedly connected to the end of the valve body 3 on the side where the first cavity 33 is located; the first end of the valve core 7 is connected to the valve body 3 via a spring 5. The spring 5 is positioned between the end cap 4 and the valve core 7; a valve sleeve 6 can be fixedly connected to the inside of the sliding hole 35, and the outer side of the valve core 7 is in close contact with the inner side of the valve sleeve 6 and can slide relative to each other. If the valve sleeve 6 is not provided, when the valve core 7 is assembled into the valve body 3, the outer side of the valve core 7 can also directly and tightly contact the inner wall of the sliding hole 35, thereby blocking the communication between the first cavity 33 and the second cavity 34 through the sliding hole 35.

[0020] The valve core 7 is installed in the sliding hole 35, with its first end extending into the first cavity 33 and its second end extending into the second cavity 34. The output end of the proportional electromagnet 2 is fixedly connected to the second end of the valve core 7, and is used to drive the valve core 7 to slide axially within the valve sleeve 6. One end of the spring 5 abuts against the first end of the valve core 7, and the other end is pre-pressed against the inside of the end cover 4. The elastic force of the spring 5 and the electromagnetic force of the proportional electromagnet 2 form a force balance. When the proportional electromagnet 2 is de-energized, the spring 5 can drive the valve core 7 to reset.

[0021] This design eliminates the second flow channel 32 originally located in the valve body 3. The valve core 7 has a through valve core flow channel inside, which forms a new connection path, allowing the first cavity 33 and the second cavity 34 to be interconnected through the valve core flow channel, thereby simplifying the flow channel structure in the valve body 3.

[0022] Specifically, the valve core flow channel includes an axial flow channel 71 and a radial flow channel 72. The opening of the valve core flow channel at the first end of the valve core 7 is axially arranged and is called the axial opening. The opening at the second end of the valve core 7 is radially arranged and is called the radial opening. The axial flow channel 71 starts from the axial opening at the first end of the valve core 7 and connects to the first cavity 33. The axial flow channel 71 extends axially to the second end of the valve core 7. The radial flow channel 72 is located at the second end of the valve core 7, connects to the axial flow channel 71, and connects to the second cavity 34 through the radial opening.

[0023] The proportional electromagnet 2 is electrically connected to the amplifier 1. The amplifier 1 receives the input electrical signal and outputs a drive current to the proportional electromagnet 2, which in turn drives the valve core 7 to move through its extension and retraction. The valve sleeve 6 has a throttling window; the displacement of the valve core 7 changes its opening relative to the throttling window, thereby controlling the flow rate or pressure of the hydraulic oil flowing through the valve body 3. Furthermore, the proportional electromagnet 2 contains a built-in displacement sensor, which is electrically connected to the amplifier 1. This sensor detects the actual position of the valve core 7 in real time and feeds it back to the amplifier 1. The amplifier 1 dynamically adjusts the output current through closed-loop control, thereby precisely controlling the position of the valve core 7 and thus precisely regulating the flow rate of the proportional valve.

[0024] The flow channel structure of this novel high-frequency response proportional directional valve simplifies the internal casting flow channel structure of the valve body, increases its safety margin, and makes it easier to pressurize. The addition of internal flow channels to the valve core reduces the weight of the valve core and improves dynamic response performance.

[0025] 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.

[0026] 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 proportional directional valve flow channel structure, characterized in that, include: Valve body (3) and valve core (7); The valve body (3) has a first cavity (33) and a second cavity (34) at both ends. The valve body (3) has a sliding hole (35). The first cavity (33) and the second cavity (34) are connected only through the sliding hole (35). The valve core (7) is fitted inside the sliding hole (35), and the radial surface of the valve core (7) seals the sliding hole, thereby blocking the first cavity (33) and the second cavity (34) from communicating through the sliding hole (35); The valve core (7) has a through valve core flow channel inside, which forms a new connection path, so that the first cavity (33) and the second cavity (34) are connected to each other through the valve core flow channel.

2. The proportional directional valve flow channel structure according to claim 1, characterized in that, The first end of the valve core (7) extends into the first cavity (33), and the second end extends into the second cavity (34); The valve core flow channel has an axial opening at the first end of the valve core (7) and a radial opening at the second end of the valve core (7); The valve core flow channel includes an axial flow channel (71) and a radial flow channel (72), wherein: The axial flow channel (71) starts from the axial opening at the first end of the valve core (7) and connects to the first cavity (33), and extends along the axial direction of the valve core (7) to the second end of the valve core (7). A radial flow channel (72) is provided at the second end of the valve core (7). The radial flow channel (72) connects to the axial flow channel (71) and connects to the second cavity (34) through a radial opening.

3. The proportional directional valve flow channel structure according to claim 1, characterized in that, It also includes: a proportional electromagnet (2) and a spring (5); The first end of the valve core (7) is connected to the valve body (3) via a spring (5), the proportional electromagnet (2) is fixedly connected to the valve body (3), and the second end of the valve core (7) is connected to the output end of the proportional electromagnet (2). When the proportional electromagnet (2) is energized, its output end can drive the valve core (7) to slide along the sliding hole (35). When the proportional electromagnet (2) is de-energized, the spring (5) can drive the valve core (7) to reset.

4. The proportional directional valve flow channel structure according to claim 3, characterized in that, Also includes: End cap (4) and valve sleeve (6); The proportional electromagnet (2) is fixedly connected to the end of the valve body (3) on the side where the second cavity (34) is located; The end cap (4) is fixedly connected to the end of the valve body (3) on the side where the first cavity (33) is located; One end of the spring (5) abuts against the first end of the valve core (7), and the other end is pre-pressed on the inside of the end cap (4). The elastic force of the spring (5) and the electromagnetic force of the proportional electromagnet (2) form a force balance, which is used to assist the valve core (7) in resetting. The valve sleeve (6) is fitted inside the sliding hole (35) and is fixedly connected to the valve body (3). The valve core (7) is fitted inside the valve sleeve (6). The valve core (7) and the valve sleeve (6) are closely fitted and can slide relative to each other.

5. The proportional directional valve flow channel structure according to claim 3, characterized in that, Also includes: Amplifier (1); The proportional electromagnet (2) is electrically connected to the amplifier (1). The amplifier (1) is used to receive the input electrical signal and output the drive current to the proportional electromagnet (2). The valve core (7) is moved by controlling the extension and retraction of the output end of the proportional electromagnet (2).

6. The proportional directional valve flow channel structure according to claim 4, characterized in that, The valve sleeve (6) is provided with a throttling window. The displacement of the valve core (7) can change its opening with the throttling window in order to control the flow rate or pressure of the hydraulic oil flowing through the flow channel of the valve body (3).

7. The proportional directional valve flow channel structure according to claim 5, characterized in that, The proportional electromagnet (2) has a built-in displacement sensor, which is electrically connected to the amplifier (1) to detect the actual position of the valve core (7) in real time and feed it back to the amplifier (1). The amplifier (1) dynamically adjusts the output current through closed-loop control, thereby accurately controlling the position of the valve core (7).

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