Normally open cone valve type pressure compensator

Abstract

The utility model provides a normally open cone valve type pressure compensator, which relates to the field of compensators and comprises a valve sleeve, two sealing structures are arranged outside the valve sleeve, the inside of the valve sleeve is of a stepped hole structure, the outside of the valve sleeve is of a stepped outer circle structure, and an oil inlet, an oil outlet and a feedback oil port are arranged on the valve sleeve. The valve element is of a step outer circle structure and is in clearance fit with the step hole in the valve sleeve. The valve element is of a step outer circle structure and is matched with a step hole in the valve sleeve to form a combination of sliding sealing and conical surface mechanical hard sealing. The sliding seal is small in compression amount and mainly used for stabilizing the flow of a damping hole and reducing gap leakage, the resistance can be basically ignored, and the movement flexibility of the valve element cannot be affected; the conical surface mechanical hard seal achieves reliable sealing when the valve element abuts against the specific position of the valve sleeve, leakage is effectively eradicated, the strict requirement for no leakage of precision machinery, automation equipment and the like is met, and stable operation and accurate control of a system are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of compensators, and in particular to a normally open cone valve type pressure compensator. Background Technology

[0002] In the fields of industrial automation and precision machining, the performance of hydraulic systems is crucial, and pressure compensators are key components for stabilizing flow. Currently, pressure compensators are mostly integrated into speed control valves or used independently, but leakage problems are common.

[0003] In precision machinery manufacturing, flow fluctuations can affect machining accuracy and reduce product quality. In automated equipment, unstable flow can lead to malfunctions and reduced production efficiency. Traditional pressure compensators often use spool valves with a sliding valve diameter structure. While adding a sliding seal can reduce leakage, under high pressure and high flow, the sealing resistance increases significantly, the valve core moves slowly, and the seal is prone to wear. After wear, leakage problems worsen, seriously affecting the stability of the hydraulic system.

[0004] This utility model of a normally open cone valve type pressure compensator innovatively adopts a stepped structure combined with sliding seal and mechanical hard seal, which solves the problems of leakage and slow response of traditional products, and is of great significance to the fields of precision machinery and automation equipment. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by employing a stepped outer circular structure for the valve core, which mates with the stepped hole inside the valve sleeve to form a combination of sliding seal and conical mechanical hard seal. The sliding seal has a small compression amount, primarily used to stabilize the flow rate of the damping orifice and reduce gap leakage, and its resistance is negligible, not affecting the flexibility of valve core movement. The conical mechanical hard seal achieves a reliable seal when the valve core and valve sleeve abut at a specific position, effectively preventing leakage and meeting the stringent requirements of precision machinery and automated equipment for leak-free operation, ensuring stable system operation and precise control.

[0006] To solve the above-mentioned technical problems, this utility model solves the problems of leakage and slow response of traditional products through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A normally open cone valve type pressure compensator includes:

[0009] The valve sleeve has two sealing structures on its outside. The valve sleeve has a stepped hole structure inside and a stepped outer circle structure on its outside. The valve sleeve is provided with an oil inlet, an oil outlet and a feedback oil port.

[0010] The valve core has a stepped outer circle structure and is clearance-fitted with the stepped hole inside the valve sleeve. The left end of the valve core is provided with a stepped blind hole, and the blind hole is provided with internal threads and radial small holes.

[0011] A spring, which is disposed in a blind hole at the left end of the valve core, is used to provide a biasing force;

[0012] A spring seat, which is disposed in the large-diameter hole of the valve sleeve, is used to limit the spring;

[0013] The connecting rod has a stepped outer circle structure, with radially symmetrical small holes on the small diameter, a spring seat on the middle diameter, and a limiting spring on the large diameter.

[0014] A damping screw plug is disposed in the internal thread of the blind hole at the left end of the valve core and is used to adjust the moving speed of the valve core.

[0015] Preferably, the first sealing structure separates the oil inlet and the oil outlet, the second sealing structure separates the oil outlet and the feedback oil outlet, and the two sealing structures are connected to the inner hole of the valve sleeve through a radial hole.

[0016] Preferably, the right end face of the valve core is connected to the oil inlet, and the large-diameter left end face of the valve core is connected to the feedback oil port. The biasing force of the spring and the oil pressure force are balanced to realize the movement of the valve core and the opening and closing of the oil port.

[0017] Preferably, a needle roller is arranged in the radial hole in the blind hole at the left end of the valve core and the radially symmetrical hole on the small diameter of the connecting rod, for assembling the valve core and the connecting rod together.

[0018] Preferably, the radial oil passage of the oil outlet uses a combination of small-diameter and large-diameter holes, and is arranged axially offset from the center to achieve a linear increase in the valve opening area.

[0019] Preferably, the stepped outer circle of the valve core mates with the stepped hole inside the valve sleeve to form a sliding seal and a conical mechanical hard seal, thereby achieving zero leakage.

[0020] Preferably, the orifice diameter of the damping screw plug is replaceable, which is used to adjust the moving speed of the valve core and realize the adjustability of the flow opening time.

[0021] Preferably, the outer circle of the left end of the valve sleeve is provided with an external thread, which is connected to the internal thread of the plug to form a complete pressure compensator structure.

[0022] Preferably, the conical surface of the valve core abuts against the stepped end face of the inner hole of the valve sleeve to form a mechanical hard seal.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The normally open cone valve type pressure compensator provided in this application features a stepped outer circular structure for the valve core, which mates with the stepped hole inside the valve sleeve to form a combination of sliding seal and conical mechanical hard seal. The sliding seal has a small compression amount and is mainly used to stabilize the flow rate of the damping orifice and reduce gap leakage. Its resistance is negligible and does not affect the flexibility of valve core movement. The conical mechanical hard seal achieves a reliable seal when the valve core and valve sleeve abut at a specific position, effectively preventing leakage and meeting the stringent requirements of precision machinery and automated equipment for leak-free operation, ensuring stable system operation and precise control.

[0025] Smooth flow opening: The radial oil passage at the oil outlet uses a structure with a small-diameter hole and a large-diameter hole that are offset from the center along the axial direction. When the valve core first opens, a small flow rate enters the oil outlet through the small-diameter radial hole, avoiding a sudden drop in pressure of the proportional throttle valve, ensuring a smooth load decrease, preventing shocks to the system and load caused by sudden flow changes, and improving the stability and reliability of system operation.

[0026] Adjustable flow opening time: By changing the orifice diameter of the damping screw plug, the oil pressure difference before and after the valve core can be altered, thereby adjusting the valve core's movement speed and achieving flexible adjustment of the flow opening time. This feature allows the pressure compensator to better adapt to different operating conditions, enabling users to precisely control the flow response time according to actual working conditions, improving the system's adaptability and controllability.

[0027] Sensitive Response: Compared to the traditional valve core spool diameter structure of pressure compensators, the structure adopted by this compensator greatly reduces the sliding seal resistance, effectively improving the sensitivity and flexibility of valve core movement. Even under high pressure and high flow conditions, the valve core can respond quickly and accurately to pressure changes, promptly adjusting the opening and closing of the oil port and the flow rate to ensure stable system flow and improve system dynamic performance.

[0028] Compact and complete structure: The valve sleeve and plug are connected by threads to form a complete structure. The internal components, such as the valve core, spring, spring seat, and connecting rod, are rationally arranged and fit together tightly. This compact structural design not only facilitates installation and maintenance but also effectively saves space, making it suitable for equipment and systems with high space requirements.

[0029] Stable pressure compensation: This ensures a relatively constant pressure difference across the valve orifice. Based on the spool valve orifice flow formula, it stabilizes the flow rate through the valve orifice when the valve opening remains constant, unaffected by changes in load pressure. When used in conjunction with a throttle valve, it enables stable flow rate adjustment, meeting the stable flow requirements of the speed control loop and improving system accuracy and efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] Drawing number explanation: 1. Valve sleeve; 2. Valve core; 3. Spring; 4. Spring seat; 5. Connecting rod; 6. Damping screw plug; 8. Screw plug; 9. Oil inlet; 10. Oil outlet; 11. Feedback oil port. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings.

[0034] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0035] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0036] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0037] Please see Figure 1 A normally open cone valve type pressure compensator includes: a valve sleeve 1, the valve sleeve 1 having two sealing structures on its exterior, the valve sleeve 1 having a stepped hole structure inside and a stepped outer circle structure on its exterior, and the valve sleeve 1 having an oil inlet 9, an oil outlet 10 and a feedback oil port 11.

[0038] Valve core 2 has a stepped outer circle structure and is clearance-fitted with the stepped hole inside the valve sleeve 1. A stepped blind hole is provided at the left end of the valve core 2, and an internal thread and a radial small hole are provided inside the blind hole.

[0039] Spring 3 is located in the blind hole at the left end of valve core 2 and is used to provide bias force;

[0040] Spring seat 4 is set in the large-diameter hole of valve sleeve 1 and is used to limit spring 3;

[0041] Connecting rod 5 has a stepped outer circle structure. It has radially symmetrical small holes on the small diameter, a spring seat 4 on the middle diameter, and a limiting spring 3 on the large diameter.

[0042] Damping screw 6 is set in the internal thread of the blind hole at the left end of valve core 2 and is used to adjust the moving speed of valve core 2.

[0043] The normally open cone valve type pressure compensator of this application is mainly composed of valve sleeve 1, valve core 2, spring 3, spring seat 4, connecting rod 5, damping screw plug 6 and other components. The following is a detailed description of its structure and working principle:

[0044] I. Detailed Structure and Connection Methods of Each Component

[0045] Valve sleeve 1: It has two external sealing structures. The first sealing structure separates the oil inlet 9 and the oil outlet 10, and the second sealing structure separates the oil outlet 10 and the feedback port 11. The two sealing structures are connected to the inner hole of valve sleeve 1 through a radial hole. The interior of valve sleeve 1 has a stepped bore structure. The minimum diameter is clearance-fitted with the small outer circle of valve core 2, and the middle diameter is clearance-fitted with the large outer circle of valve core 2. The large diameter at the left end is used to house the spring seat 4. The exterior of valve sleeve 1 has a stepped outer circle structure. The left outer circle has an external thread that connects to the internal thread of the plug 8, forming a complete pressure compensator structure. Valve sleeve 1 is equipped with an oil inlet 9, an oil outlet 10, and a feedback port 11.

[0046] Valve core 2: It has a stepped outer circular structure and is clearance-fitted with the stepped hole inside the valve sleeve 1. A stepped blind hole is provided at the left end, containing internal threads and radial small holes. A radially symmetrical small hole is provided in the large stepped hole at the left end. Needle rollers are arranged in alignment with the radially symmetrical small holes on the small diameter of the connecting rod 5, thus assembling the valve core 2 and the connecting rod 5 together. The right end face of the valve core 2 communicates with the oil inlet 9, and the large diameter surface at the left end communicates with the feedback oil port 11. When its conical surface abuts against the stepped end face of the inner hole of the valve sleeve 1, it forms a mechanical hard seal.

[0047] Spring 3: Located in the blind hole at the left end of valve core 2, it provides biasing force to valve core 2, so that valve core 2 is biased to the left end of valve sleeve 1 in the initial state.

[0048] Spring seat 4: Located inside the large-diameter hole of valve sleeve 1, it is used to limit spring 3 and ensure the stable installation and normal operation of spring.

[0049] Connecting rod 5: It has a stepped outer circle structure, with radially symmetrical small holes on the small diameter, a spring seat 4 on the middle diameter, and a limit spring 3 on the large diameter. It is connected to the valve core 2 through a needle roller.

[0050] Damping plug 6: It is set in the internal thread of the blind hole at the left end of the valve core 2. Its diameter can be replaced. It is used to adjust the moving speed of the valve core 2 and realize the adjustment of the flow opening time.

[0051] II. Working Principle

[0052] Initial state: When the pressure compensator is not connected to the working system, or when the system is in its initial non-working state, spring 3 is in a compressed state. Since spring 3 is located in the blind hole at the left end of valve core 2, the compressive force it generates acts on valve core 2 through spring seat 4, causing valve core 2 to be biased at the left end of valve sleeve 1. At this time, the oil inlet 9 and oil outlet 10 of valve sleeve 1 are connected, providing an initial passage for the subsequent flow of hydraulic oil.

[0053] When the proportional throttle valve is not energized: When the proportional throttle valve is not energized, the load pressure is maintained at the outlet of the proportional throttle valve. This pressure is transmitted to the feedback port 11 of the compensator through an external oil circuit connection. The pressurized oil first enters the stepped hole inside the valve sleeve 1 through the radial oblique hole on the valve sleeve 1. Then, the oil passes through the radial hole on the valve core 2, the blind hole at the left end of the valve core 2, and the damping screw plug 6 hole, and finally enters the spring cavity, acting on the large-diameter surface at the left end of the valve core 2.

[0054] As the pressure at feedback port 11 gradually increases, when the hydraulic pressure acting on the large-diameter surface at the left end of valve core 2 exceeds the biasing force of spring 3, valve core 2 begins to move to the right. Valve core 2 continues to move to the right until its stepped conical surface abuts against the stepped end face of the inner hole of valve sleeve 1. At this point, a mechanical hard seal is formed between valve core 2 and valve sleeve 1, and valve core 2 is axially limited to this position, thereby closing the inlet 9 and outlet 10 of the compensator, preventing hydraulic oil from continuing to flow from inlet 9 to outlet 10, and achieving the function of maintaining system pressure.

[0055] When the proportional throttle valve is energized: After the proportional throttle valve is energized, the flow direction of the load pressure oil changes, flowing from the outlet of the throttle valve to the inlet, and then entering the inlet 9 of the compensator, acting on the right end face of the valve core 2. At this time, there is a hydraulic pressure force simultaneously existing between the inlet 9 of the compensator and the feedback port 11.

[0056] The hydraulic pressure forces at the inlet 9 and the feedback port 11 are different, and the difference between them is the spring force of the compensator. When the difference between the hydraulic pressure force at the inlet 9 and the feedback port 11 causes the resultant force on the valve core 2 to shift to the left, the valve core 2 begins to move to the left. As the valve core 2 moves to the left, the radial oil hole at the outlet 10 of the valve sleeve 1 is gradually opened.

[0057] The radial oil passage of the oil outlet 10 employs a special structure with a combination of small-diameter and large-diameter holes, offset axially from each other. When the valve core 2 first opens, the hydraulic oil first enters the oil outlet 10 through the small-diameter radial hole. This prevents a sudden drop in the outlet pressure of the proportional throttle valve, thus ensuring a smooth load reduction. As the valve core 2 continues to move to the left, the valve opening area increases almost linearly to meet different flow rate requirements.

[0058] As the valve core 2 moves, the pressure at the system inlet 9 and outlet 10 changes continuously. When the two pressures reach equilibrium, the valve core 2 is in a balanced state under the action of the spring force. At this time, a stable passage is maintained between the inlet and outlet of the compensator, allowing hydraulic oil to flow from the inlet 9 to the outlet 10 at a stable flow rate, thus realizing the function of stabilizing the flow rate of the pressure compensator.

[0059] Throttling characteristics and flow opening time adjustment: The special throttling structure of the oil outlet 10, namely the design of a small-diameter orifice and a large-diameter orifice that are offset from each other along the axial direction, allows the valve opening area to increase almost linearly with the movement of the valve core 2. This design ensures smooth flow opening and avoids the impact of sudden flow changes on the system.

[0060] Furthermore, by changing the orifice diameter of the damping plug 6, the oil pressure difference across the valve core 2 can be altered. Because the damping plug 6 is located in the internal thread of the blind hole at the left end of the valve core 2, the oil passing through the hole of the damping plug 6 generates a certain damping effect. Different orifice diameters of the damping plug 6 result in different resistances to the oil flow, thus changing the oil pressure difference across the valve core 2. This change in the oil pressure difference affects the movement speed of the valve core 2, thereby adjusting the flow opening time to adapt to the flow response time requirements under different operating conditions.

[0061] Through the coordinated operation of the above components, the normally open cone valve type pressure compensator of this utility model achieves functions such as zero leakage, smooth flow opening and adjustable time, and solves the problems of leakage and slow response of traditional pressure compensators.

[0062] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A pressure compensator of the constant-open-cone-valve type, characterized in that, The utility model relates to a valve sleeve (1) is provided with two sealing structures outside, the inside is stepped hole structure, the outside is stepped outer circle structure, and is provided with oil inlet (9), oil outlet (10) and feedback oil port (11) on the valve sleeve (1), the valve core (2) is stepped outer circle structure, and is provided with stepped blind hole on the left end, and is provided with internal thread and radial small hole in the blind hole, the spring (3) is arranged in the blind hole of the left end of valve core (2) and is used for providing bias force, the spring seat (4) is arranged in the big diameter hole of valve sleeve (1) and is used for limiting spring (3), the connecting rod (5) is stepped outer circle structure, and is provided with radial symmetry small hole on small diameter, and is provided with spring seat (4) on middle diameter, and is used for limiting spring (3) on big diameter, the damping screw plug (6) is arranged in the internal thread of the blind hole of the left end of valve core (2) and is used for adjusting the moving speed of valve core (2). The first sealing structure separates the oil inlet (9) and the oil outlet (10), the second sealing structure separates the oil outlet (10) and the feedback oil port (11), and the two sealing structures are connected through the radial hole in the valve sleeve (1). The right end surface of the valve core (2) is communicated with the oil inlet (9), the left end large diameter surface of the valve core (2) is communicated with the feedback oil port (11), the bias force of the spring (3) and the oil pressure force are balanced, the movement of the valve core (2) and the opening and closing of the oil port are realized. The radial small hole in the blind hole of the left end of the valve core (2) and the radial symmetry small hole on the small diameter of the connecting rod (5) are arranged with a needle roller in the center, which is used for combining the valve core (2) and the connecting rod (5). The radial oil hole of the oil outlet (10) is matched with a small diameter hole and a large diameter hole, and is arranged in the center in the axial direction, which is used for realizing the linear increase of the valve port opening area. The stepped outer circle of the valve core (2) is matched with the stepped hole in the valve sleeve (1), which forms a sliding seal and a conical mechanical hard seal, and is used for realizing zero leakage. The hole diameter of the damping screw plug (6) can be replaced, which is used for adjusting the moving speed of the valve core (2) and realizing the adjustability of the flow opening time.

2. A normally open cone valve type pressure compensator according to claim 1, characterized in that: The outer thread is arranged on the left end outer circle of the valve sleeve (1), the inner thread of the screw plug (8) is connected with the outer thread, which is used for forming a complete pressure compensator structure.

3. The normally open cone valve pressure compensator of claim 1, wherein: The conical surface of the valve core (2) is abutted with the stepped end surface of the inner hole of the valve sleeve (1), which forms a mechanical hard seal.

4. The normally open cone valve pressure compensator of claim 1, wherein: ​ 5. The normally open cone valve pressure compensator of claim 1, wherein: ​ 6. A normally open cone valve type pressure compensator according to claim 1, characterized in that: ​ 7. A normally open cone valve pressure compensator according to claim 1, characterized in that: ​ 8. The normally open cone valve pressure compensator of claim 1, wherein: ​ 9. The normally open cone valve pressure compensator of claim 1, wherein: ​

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