Two-way proportional throttle valve
By using a threaded cartridge valve as a pilot valve in the throttle valve and controlling the position of the main valve core using differential pressure, the problem of increased cost and complexity of displacement sensors is solved, and high-reliability and high-responsiveness flow control is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING HUADE HYDRAULIC INDAL GROUP
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-12
AI Technical Summary
In existing throttle valves, the use of displacement sensors increases the system hardware cost and the complexity of the control circuit. Once the sensor fails, the valve loses its continuous control function.
By using a threaded cartridge valve as the pilot valve, and connecting the pilot oil passage to the main valve core, the position of the main valve core is controlled by the pressure difference, thereby achieving continuous proportional regulation of the flow rate and reducing uncontrollable factors in the control process.
It achieves highly reliable, stable, and responsive flow control with a compact structure, reducing system complexity and maintenance costs.
Smart Images
Figure CN224229393U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of throttle valve technology, specifically to a two-way proportional throttle valve. Background Technology
[0002] In existing throttle valves, a displacement sensor is usually integrated to precisely control the position of the valve core and achieve accurate flow regulation. However, the presence of the displacement sensor not only increases the hardware cost of the system but also complicates the control circuit. If the control loop of the position sensor fails, the throttle valve will lose its continuous control function. Utility Model Content
[0003] In order to solve the problems existing in the prior art, this disclosure provides the following technical solution:
[0004] A two-way proportional throttle valve, comprising:
[0005] The main valve includes a main valve seat with a valve cavity and a valve cover fixed to one end of the main valve seat; a main valve core for controlling the passage between the oil inlet and the oil outlet is provided in the valve cavity; wherein, the valve cover is provided with a control cavity communicating with the rodless cavity;
[0006] A cover plate is disposed at one end of the valve cover away from the main valve seat. A pilot oil passage is provided inside the cover plate. One end of the pilot oil passage is configured as a pilot oil inlet and the other end is configured as a return oil port. The portion of the pilot oil passage located between the pilot oil inlet and the return oil port is configured to extend toward the valve cover to form a connecting oil passage communicating with the control chamber.
[0007] A threaded cartridge valve is mounted on the cover plate. The threaded cartridge valve includes a pilot valve seat and a pilot valve core. A pilot valve cavity is formed in the pilot oil passage between the return oil port and the connecting oil passage. The pilot valve core cooperates with the pilot valve cavity and is configured to adjust the oil pressure of the control cavity by displacement.
[0008] The main valve core is configured to move under the pressure difference between the control chamber and the oil inlet to adjust the position of the main valve core in the valve chamber.
[0009] In one embodiment of this disclosure, the main valve core is provided with a closed end and an open end with a groove, the open end being configured to face the rodless cavity; the closed end is configured to cooperate with the main valve seat to control the opening degree of the oil inlet.
[0010] In one embodiment of this disclosure, a return spring is provided inside the main valve core. One end of the return spring is configured to abut against a groove in the open end, and the other end extends out of the open end and abuts against the valve cover. The return spring is configured to provide an elastic force to the main valve core to move toward the oil inlet.
[0011] In one embodiment of this disclosure, the groove, rodless cavity, and control cavity are configured to be arranged coaxially.
[0012] In one embodiment of this disclosure, the threaded cartridge valve further includes an armature connected to the pilot valve core via a push rod, and a coil sleeved on the outside of the armature, the coil being configured to receive a control signal and then drive the pilot valve core to move through the armature.
[0013] In one embodiment of this disclosure, an elastic device is provided on the pilot valve core, the elastic device being configured to provide an elastic force to the pilot valve core in a direction of sealing the pilot valve cavity.
[0014] In one embodiment of this disclosure, the armature is configured to close the passage between the pilot oil passage and the return oil port by the pilot valve core in the power-off state; the main valve core is configured to be in the state of closing the oil inlet under the pressure difference between the oil inlet and the control chamber.
[0015] In one embodiment of this disclosure, a plurality of damping holes are provided in the pilot oil passage located between the connecting oil passage and the pilot oil inlet. The pilot oil is configured to enter from the pilot oil inlet and flow through the damping holes in the pilot oil passage.
[0016] In one embodiment of this disclosure, the pilot oil inlet and the return oil outlet are located on the same side of the cover plate.
[0017] In one embodiment of this disclosure, the outer circumferential surface of the main valve core is provided with at least one annular sealing groove, and the sealing ring is configured to be nested in the annular sealing groove and to slide and seal with the valve cavity.
[0018] The two-way proportional throttle valve disclosed herein uses a threaded cartridge valve as a pilot valve to control the pressure of the pilot oil in the pilot oil passage. Since the pilot oil passage is connected to the upper end of the main valve core through the control chamber of the valve cover, and the working oil enters from the oil inlet at the lower end of the main valve core, the main valve core moves under the pressure difference between the control chamber and the oil inlet, thereby continuously and proportionally controlling the flow rate of the working oil. This two-way proportional throttle valve directly applies the control voltage to the threaded cartridge valve, thereby reducing uncontrollable factors in the control process and featuring high reliability, high stability, high responsiveness, and compact structure.
[0019] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.
[0021] Figure 1 This is a cross-sectional view of a two-way proportional throttle valve provided in an embodiment of this disclosure;
[0022] Figure 2 This is a schematic diagram of the structure of a threaded cartridge valve provided in an embodiment of the present disclosure;
[0023] Figure 3 This is a schematic diagram of the structure of a two-way proportional throttle valve provided in one embodiment of the present disclosure.
[0024] Figures 1 to 3 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:
[0025] 1. Main valve; 11. Main valve seat; 12. Main valve core; 121. Annular sealing groove; 13. Rodless chamber; 14. Return spring; 2. Valve cover; 21. Control chamber; 3. Cover plate; 31. Pilot oil passage; 311. Pilot oil inlet; 312. Return oil port; 313. Connecting oil passage; 314. Damping orifice; 4. Threaded cartridge valve; 41. Pilot valve seat; 42. Pilot valve core; 43. Push rod; 44. Armature; 45. Coil; 46. Elastic device. Detailed Implementation
[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.
[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.
[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0030] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.
[0031] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.
[0032] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.
[0033] This disclosure provides a two-way proportional throttle valve, including a main valve, a cover plate, and a threaded cartridge valve. The main valve includes a main valve seat with a valve cavity and a valve cover fixed to one end of the main valve seat. The cover plate is located at the end of the valve cover away from the main valve seat, and the threaded cartridge valve is mounted on the cover plate. A main valve core for controlling the passage between the oil inlet and the oil outlet is provided in the valve cavity. A pilot oil passage provided in the cover plate is connected to a control cavity provided on the valve cover through a connecting oil passage. One end of the pilot oil passage is a pilot oil inlet, and the other end is a return oil outlet. The threaded cartridge valve includes a pilot valve seat, a pilot valve core, and a pilot valve cavity. The pilot valve core cooperates with the pilot valve cavity and adjusts the oil pressure in the control cavity by displacement. The main valve core moves in the valve cavity under the pressure difference between the control cavity and the oil inlet.
[0034] The two-way proportional throttle valve disclosed herein uses a threaded cartridge valve as a pilot valve to control the pressure of the pilot oil in the pilot oil passage. Since the pilot oil passage is connected to the upper end of the main valve core through the control chamber of the valve cover, and the working oil enters from the oil inlet at the lower end of the main valve core, the main valve core moves under the pressure difference between the control chamber and the oil inlet, thereby continuously and proportionally controlling the flow rate of the working oil. This two-way proportional throttle valve directly applies the control voltage to the threaded cartridge valve, thereby reducing uncontrollable factors in the control process and featuring high reliability, high stability, high responsiveness, and compact structure.
[0035] For ease of understanding, please refer to the following: Figures 1 to 3 The specific structure and working principle of the two-way proportional throttle valve of this disclosure will be described in detail with reference to an embodiment.
[0036] Reference Figures 1 to 3The main valve 1 includes a main valve seat 11 with a valve cavity and a valve cover 2 fixed to one end of the main valve seat 11. A main valve core 12 for controlling the passage between the oil inlet and outlet is provided within the valve cavity. A control cavity 21 communicating with the rodless cavity 13 is provided on the valve cover 2. A cover plate 3 is located at the end of the valve cover 2 away from the main valve seat 11. A pilot oil passage 31 is provided inside the cover plate 3. One end of the pilot oil passage 31 is a pilot oil inlet 311, and the other end is a return oil port 312. The pilot oil passage 31 is located between the pilot oil inlet 311 and the return oil port 312. Extending towards the valve cover 2, it forms a connecting oil passage 313 that communicates with the control chamber 21; the threaded cartridge valve 4 is mounted on the cover plate 3. The threaded cartridge valve 4 includes a pilot valve seat 41 and a pilot valve core 42. A pilot valve chamber is formed in the pilot oil passage 31 at the position between the return oil port 312 and the connecting oil passage 313. The pilot valve core 42 cooperates with the pilot valve chamber and adjusts the oil pressure of the control chamber 21 by displacement; the main valve core 12 is configured to move under the pressure difference between the control chamber 21 and the oil inlet to adjust the position of the main valve core 12 in the valve chamber.
[0037] Specifically, the two-way proportional throttle valve disclosed herein mainly includes a main valve 1, a cover plate 3, and a threaded cartridge valve 4. The main valve 1 is used to control the flow rate of the working oil. The main valve 1 is fixedly connected to the lower end of the cover plate 3 through a valve cover 2. The threaded cartridge valve 4 is installed on the cover plate 3, and the pilot valve core 42 of the threaded cartridge valve 4 is set in the pilot oil passage 31 of the cover plate 3. The opening and closing of the return port 312 and the pilot oil passage 31 can be controlled by controlling the position of the pilot valve core 42.
[0038] The main valve 1 includes a main valve seat 11 with a valve cavity and a valve cover 2 fixed to one end of the main valve seat 11. A cover plate 3 is located at the end of the valve cover 2 away from the main valve seat 11. The valve cavity of the main valve 1 is divided into a rodless chamber 13 by the main valve core 12. The rodless chamber 13 is located at the upper end of the main valve core 12 and is connected to the control chamber 21 on the valve cover 2. The rodless chamber 13 can receive pilot oil from the control chamber 21 and provide pilot oil pressure to the main valve core 12 to close the oil inlet. The oil port is located at the bottom of the main valve seat 11, and the oil outlet is located on the side wall of the main valve seat 11. The main valve core 12 is used to control the passage between the oil inlet and the oil outlet. When the pilot oil pressure in the control chamber 21 is greater than or equal to the pressure of the oil inlet, the main valve core 12 closes the oil inlet. When the pilot oil pressure in the control chamber 21 is less than the pressure of the oil inlet, the main valve core 12 moves upward under the action of the oil pressure at the oil inlet, and the passage between the oil inlet and the oil outlet is opened, allowing the working oil to flow out through the oil outlet.
[0039] Furthermore, a pilot oil passage 31 is provided inside the cover plate 3, which connects the pilot oil inlet 311 and the return oil port 312. A connecting oil passage 313 is provided in the part of the pilot oil passage 31 located between the pilot oil inlet 311 and the return oil port 312. The connecting oil passage 313 extends towards the valve cover 2 and connects with the control chamber 21 on the valve cover 2. The connecting oil passage 313 is used to introduce pilot oil from the pilot oil passage 31 into the rodless chamber 13 to provide pilot oil pressure to the upper end of the main valve core 12, thereby cooperating with the working oil pressure of the oil inlet and controlling the movement of the main valve core 12 through the pressure difference between the two. The threaded cartridge valve 4 is installed on the cover plate 3. The pilot valve seat 41 and the pilot valve core 42 are inserted into the pilot oil passage 31, forming a pilot valve chamber between the return oil port 312 and the connecting oil passage 313. By continuously controlling the displacement of the pilot valve core 42, the opening degree of the return oil port 312 is dynamically controlled, the pilot oil pressure in the control chamber 21 is dynamically adjusted, and the displacement of the main valve core 12 is controlled, thereby continuously proportionally controlling the flow rate of the oil inlet.
[0040] When the threaded cartridge valve 4 is de-energized, the pilot valve core 42 of the two-way proportional throttle valve of this disclosure closes the passage between the return port 312 and the pilot oil passage 31. Pilot oil enters the pilot oil passage 31 through the pilot oil inlet 311, and then flows into the rodless chamber 13 through the control chamber 21 of the valve cover 2. The pilot oil provides downward pilot oil pressure to the main valve core 12. At this time, the pilot oil pressure is greater than or equal to the working oil pressure at the inlet, thereby closing the passage between the inlet and outlet of the main valve core 12. When the threaded cartridge valve 4 is energized, the pilot valve core 42 moves upward, and the return port 312 connects with the pilot oil passage 31. Some pilot oil flows out through the return port 312, causing the pilot oil pressure in the control chamber 21 to decrease and the pressure difference between the pilot oil and the inlet of the main valve core 12 to increase. Therefore, the main valve core 12 moves upward under the pressure of the working oil, connecting the inlet and outlet, and the working oil can flow out from the outlet. In summary, the two-way proportional throttle valve disclosed herein can achieve proportional regulation of the working oil flow by adjusting the current in the threaded cartridge valve 4, and has the characteristics of high reliability, high stability, high responsiveness and compact structure.
[0041] refer to Figure 1 In one embodiment of this disclosure, the main valve core 12 is provided with a closed end and an open end with a groove, the open end being configured to face the rodless chamber 13; the closed end is configured to cooperate with the main valve seat 11 to control the opening degree of the oil inlet.
[0042] Specifically, such as Figure 1As shown, the main valve core 12 adopts an asymmetrical double-end structure. One end of the main valve core 12 is a hemispherical closed end with a ground surface, which cooperates with the oil inlet of the main valve seat 11 to form a contact seal. The other end is an open end with a groove, which faces the rodless chamber 13 of the main valve seat 11. When the system is working, the pilot oil in the control chamber 21 enters the groove and the rodless chamber 13, so that the main valve core 12 is subjected to a more balanced hydraulic force. This effectively counteracts the off-center load caused by uneven local flow velocity and pressure fluctuations, ensuring that the main valve core 12 is subjected to uniform force during axial movement and avoiding jamming or displacement. Due to the reasonable guidance of the pilot oil by the groove structure, the stability of the system operation is significantly improved. Whether facing frequent opening and closing operations or complex and changing working conditions and pressures, the main valve core 12 can maintain a precise and stable movement state, thereby providing reliable flow and pressure control for the entire hydraulic system and ensuring efficient and stable operation of the system.
[0043] refer to Figure 1 In one embodiment of this disclosure, a return spring 14 is provided inside the main valve core 12. One end of the return spring 14 is configured to abut against a groove in the open end, and the other end extends out of the open end and abuts against the valve cover 2. The return spring 14 is configured to provide an elastic force to the main valve core 12 to move toward the oil inlet.
[0044] Specifically, one end of the return spring 14 abuts against the bottom of the groove at the open end of the main valve core 12, which can effectively prevent the return spring 14 from radially shifting during operation, while the other end extends out of the open end and abuts tightly against the valve cover 2. When the system is working, pilot oil enters the groove of the main valve core 12. The pilot oil and the return spring 14 cooperate to seal the oil inlet. When the threaded cartridge valve 4 is activated, the pilot valve core 42 moves upward, and some pilot oil flows out through the return port 312, causing the pilot oil pressure in the control chamber 21 to decrease. The working oil in the oil inlet pushes the main valve core 12 to move away from the oil inlet. At this time, the return spring 14 is compressed and produces elastic deformation, converting the external force into elastic potential energy and storing it. Once the threaded cartridge valve 4 is de-energized, the pilot valve core 42 resets, and the pilot oil pressure in the control chamber 21 rises to a level greater than or equal to the working oil pressure in the oil inlet. The spring then releases the stored elastic potential energy and pushes the main valve core 12 toward the oil inlet with its own restoring force, restoring it to its initial position, ensuring that the movement of the main valve core 12 is controllable and repeatable.
[0045] refer to Figure 1 In one embodiment of this disclosure, the groove, rodless cavity 13, and control cavity 21 are configured to be arranged coaxially.
[0046] Specifically, the groove is set inside the main valve core 12, the rodless chamber 13 is the cavity formed between the main valve core 12 and the main valve seat 11 and is located at the upper end of the main valve core 12, and the control chamber 21 is set inside the valve cover 2. The coaxial arrangement of the groove, the rodless chamber 13 and the control chamber 21 helps to ensure good fit between the valve chambers of the main valve core 12 and the main valve seat 11 and the control chamber 21, reducing the risk of leakage due to local pressure difference caused by eccentricity. The coaxial arrangement enables the two-way proportional throttle valve to maintain a high sealing standard under high pressure conditions, thereby ensuring the stable operation of the system.
[0047] refer to Figure 2 In one embodiment of this disclosure, the threaded cartridge valve 4 further includes an armature 44 connected to the pilot valve core 42 via a push rod 43, and a coil 45 sleeved on the outside of the armature 44. The coil 45 is configured to receive a control signal and then drive the pilot valve core 42 to move through the armature 44.
[0048] Specifically, such as Figure 2 As shown, the threaded cartridge valve 4 includes a pilot valve core 42, a pilot valve seat 41, an armature 44 connected to the pilot valve core 42 via a push rod 43, and a coil 45 sleeved on the outside of the armature 44. The pilot valve core 42 is located inside the pilot valve seat 41 and can move up and down within the pilot valve seat 41. When the coil 45 is energized, it can generate a magnetic field around it. The armature 44 moves upward due to the attraction of the magnetic field and drives the pilot valve core 42 connected to it to move upward synchronously through the push rod 43, opening the passage between the return oil port 312 and the pilot oil passage 31, adjusting the pressure in the control chamber 21, and thus controlling the movement of the main valve core 12.
[0049] Furthermore, the threaded cartridge valve 4 disclosed herein serves as a pilot valve, achieving precise control over the opening and closing of the main valve 1's inlet using a small flow of pilot oil, thereby reducing energy consumption and improving the efficiency of the entire hydraulic system. Simultaneously, when the throttle valve malfunctions, the threaded cartridge valve 4, due to its small size and typically easily accessible installation location, is much simpler to inspect and replace than directly operating the main valve 1, thus significantly shortening downtime and reducing maintenance costs.
[0050] refer to Figure 2 In one embodiment of this disclosure, an elastic device 46 is provided on the pilot valve core 42, the elastic device 46 being configured to provide an elastic force to the pilot valve core 42 to move in the direction of sealing the pilot valve cavity.
[0051] Specifically, such as Figure 2As shown, an elastic device 46 is provided on the pilot valve core 42. The elastic device 46 is located inside the pilot valve seat 41. When the coil 45 is energized, the armature 44 is driven by electromagnetic attraction to move the push rod 43 and the pilot valve core 42 upward. At this time, the pilot valve core 42 opens the passage between the return port 312 and the pilot oil passage 31. During this process, the pilot valve core 42 will squeeze the elastic device 46, causing it to deform and store potential energy. Once the coil 45 is de-energized, the electromagnetic attraction disappears, and the elastic device 46 releases the previously stored elastic potential energy, applying a downward restoring force to the valve core, pushing the valve core to move downward again and return to its original position, thereby closing the passage between the return port 312 and the pilot oil passage 31, realizing the cutoff of the fluid passage. During the rapid rise or fall of the pilot valve core 42, the spring can play a buffering role and absorb some kinetic energy, reducing the rigid collision between the pilot valve core 42 and the pilot valve seat 41, reducing wear, and extending service life.
[0052] refer to Figure 2 In one embodiment of this disclosure, the armature 44 is configured to close the passage between the pilot oil passage 31 and the return oil port 312 when the power is off; the main valve core 12 is configured to be in the state of closing the oil inlet under the pressure difference between the oil inlet and the control chamber 21.
[0053] Specifically, such as Figure 2 As shown, a coil 45 is sleeved on the outside of the armature 44. When the coil 45 is energized, a magnetic field is generated around it. This magnetic field acts on the armature 44, causing an attraction between the armature 44 and the coil 45. Eventually, the armature 44 moves upward and drives the pilot valve core 42 to move upward through the push rod 43, thereby opening the passage between the pilot oil passage 31 and the return oil port 312, allowing some pilot oil to flow out through the return oil port 312. At this time, the pilot oil pressure in the control chamber 21 decreases, the pressure difference between the control chamber 21 and the oil inlet increases, the main valve core 12 moves upward, and the passage between the oil inlet and the oil outlet is opened. Based on this, the operator only needs to control the strength of the current in the coil 45 to control the opening between the oil inlet and the oil outlet, thereby achieving the purpose of continuous control. Conversely, when the coil 45 is de-energized, there is no attraction between the coil 45 and the armature 44. Therefore, the armature 44 moves downwards by its own weight and the elastic force of the elastic device 46 until it closes the passage between the pilot oil passage 31 and the return oil port 312. At this time, the pressure of the pilot oil in the control chamber 21 gradually increases until it is the same as the pressure at the oil inlet. Then, the main valve core 12 closes the oil inlet under the elastic force of the return spring 14.
[0054] refer to Figure 1In one embodiment of this disclosure, a plurality of damping holes 314 are provided in the pilot oil passage 31 at the portion between the connecting oil passage 313 and the pilot oil inlet 311. The pilot oil is configured to enter from the pilot oil inlet 311 and flow through the damping holes 314 in the pilot oil passage 31.
[0055] Specifically, in order to enhance the stability of the system, this disclosure provides multiple damping holes 314 at the position between the inlet of the pilot oil passage 31 and the connecting oil passage 313. The multiple damping holes 314 can generate progressive resistance to the pilot oil flowing into them, disperse the flow energy, reduce the occurrence of turbulence and cavitation, and effectively reduce the noise and mechanical vibration caused by excessive flow velocity during the operation of the throttle valve. This helps to maintain the stability of the pilot oil, thereby improving the dynamic response speed and stability of the system.
[0056] refer to Figure 1 In one embodiment of this disclosure, the pilot oil inlet 311 and the return oil inlet 312 are located on the same side of the cover plate 3.
[0057] Specifically, placing the pilot oil inlet 311 and the return oil port 312 on the same side of the cover plate 3 simplifies the design of the internal flow channel of the cover plate 3, reduces the complexity of the internal flow channel, and makes the internal structure of the two-way proportional throttle valve more compact. Furthermore, concentrating the pilot oil inlet 311 and the return oil port 312 on one side makes it easier to connect and maintain pipelines, making the installation process simpler.
[0058] refer to Figure 1 In one embodiment of this disclosure, the outer circumferential surface of the main valve core 12 is provided with at least one annular sealing groove 121, and the sealing ring is configured to be nested in the annular sealing groove 121 and to be slidably sealed with the valve cavity.
[0059] Specifically, the opening degree of the two-way proportional throttle valve of this disclosure depends on the movement of the main valve core 12 within the valve chamber. The pressure difference between the control chamber 21 and the oil inlet is crucial in determining the movement of the main valve core 12. If there is a gap between the main valve core 12 and the valve chamber without proper sealing, the working oil at the oil inlet will leak into the control chamber 21 and mix with the pilot oil, resulting in reduced control accuracy and increased oil temperature. Therefore, to prevent the working oil at the oil inlet from flowing into the control chamber 21 and causing a change in the pressure difference between the control chamber 21 and the oil inlet, this disclosure provides at least one annular sealing groove 121 on the outer circumferential surface of the main valve core 12 for installing a sealing ring. The sealing ring can form a sliding seal with the valve chamber, thereby reducing the impact on the movement of the main valve core 12 and improving the control accuracy of the system.
[0060] The two-way proportional throttle valve disclosed herein uses a threaded cartridge valve as a pilot valve to control the pressure of the pilot oil in the pilot oil passage. Since the pilot oil passage is connected to the upper end of the main valve core through the control chamber of the valve cover, and the working oil enters from the oil inlet at the lower end of the main valve core, the main valve core moves under the pressure difference between the control chamber and the oil inlet, thereby continuously and proportionally controlling the flow rate of the working oil. This two-way proportional throttle valve directly applies the control voltage to the threaded cartridge valve, thereby reducing uncontrollable factors in the control process and featuring high reliability, high stability, high responsiveness, and compact structure.
[0061] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.
Claims
1. A two-way proportional throttle valve, characterized in that, include: The main valve (1) includes a main valve seat (11) with a valve cavity and a valve cover (2) fixed to one end of the main valve seat (11); a main valve core (12) for controlling the passage between the oil inlet and the oil outlet is provided in the valve cavity; wherein, a control cavity (21) communicating with the rodless cavity (13) is provided on the valve cover (2). A cover plate (3) is disposed at one end of the valve cover (2) away from the main valve seat (11). A pilot oil passage (31) is provided inside the cover plate (3). One end of the pilot oil passage (31) is configured as a pilot oil inlet (311), and the other end is configured as a return oil port (312). The portion of the pilot oil passage (31) between the pilot oil inlet (311) and the return oil port (312) is configured to extend toward the valve cover (2) to form a connecting oil passage (313) communicating with the control chamber (21). A threaded cartridge valve (4) is mounted on the cover plate (3). The threaded cartridge valve (4) includes a pilot valve seat (41) and a pilot valve core (42). A pilot valve cavity is formed in the pilot oil passage (31) between the return oil port (312) and the connecting oil passage (313). The pilot valve core (42) cooperates with the pilot valve cavity and is configured to adjust the oil pressure of the control cavity (21) by displacement. The main valve core (12) is configured to move under the pressure difference between the control chamber (21) and the oil inlet to adjust the position of the main valve core (12) in the valve chamber.
2. The two-way proportional throttle valve as described in claim 1, characterized in that, The main valve core (12) is provided with a closed end and an open end with a groove, the open end being configured to face the rodless chamber (13); the closed end is configured to cooperate with the main valve seat (11) to control the opening degree of the oil inlet.
3. The two-way proportional throttle valve as described in claim 2, characterized in that, The main valve core (12) is provided with a return spring (14). One end of the return spring (14) is configured to abut against the groove of the open end, and the other end extends out of the open end and abuts against the valve cover (2). The return spring (14) is configured to provide an elastic force to the main valve core (12) to move toward the oil inlet.
4. The two-way proportional throttle valve as described in claim 2, characterized in that, The groove, rodless cavity (13), and control cavity (21) are configured to be arranged coaxially.
5. The two-way proportional throttle valve as described in claim 1, characterized in that, The threaded cartridge valve (4) also includes an armature (44) connected to the pilot valve core (42) via a push rod (43), and a coil (45) sleeved on the outside of the armature (44). The coil (45) is configured to receive a control signal and then drive the pilot valve core (42) to move through the armature (44).
6. The two-way proportional throttle valve as described in claim 5, characterized in that, An elastic device (46) is provided on the pilot valve core (42), the elastic device (46) being configured to provide an elastic force to the pilot valve core (42) to move in the direction of sealing the pilot valve cavity.
7. The two-way proportional throttle valve as described in claim 5, characterized in that, The armature (44) is configured to close the passage between the pilot oil passage (31) and the return oil port (312) when the power is off; the main valve core (12) is configured to close the oil inlet under the pressure difference between the oil inlet and the control chamber (21).
8. The two-way proportional throttle valve as described in claim 1, characterized in that, The pilot oil passage (31) is provided with a plurality of damping holes (314) located between the connecting oil passage (313) and the pilot oil inlet (311). The pilot oil is configured to enter from the pilot oil inlet (311) and flow through the damping holes (314) in the pilot oil passage (31).
9. The two-way proportional throttle valve as described in claim 1, characterized in that, The pilot oil inlet (311) and the return oil inlet (312) are located on the same side of the cover plate (3).
10. The two-way proportional throttle valve as described in claim 1, characterized in that, The outer circumferential surface of the main valve core (12) is provided with at least one annular sealing groove (121), and the sealing ring is configured to be nested in the annular sealing groove (121) and is constructed to slide and seal with the valve cavity.