Hydraulic control valve and hydraulic operating mechanism

Abstract

This invention relates to the field of contact operating mechanism technology, specifically to a hydraulic control valve and a hydraulic operating mechanism. The hydraulic operating mechanism of this invention includes a hydraulic control valve, which comprises a valve body, a valve sleeve, and a valve core. The valve sleeve has a valve port, and the valve core is used to close and open the valve port. The valve core has a spherical sealing surface on the side facing the valve port. The valve port includes a conical segment and a cylindrical segment located at the end of the conical segment opposite to the valve core. The intersection line of the cylindrical segment and the conical segment forms a valve line, which is used to seal and cooperate with the spherical sealing surface on the valve core and can form a mating spherical surface that seals and cooperates with the spherical sealing surface under the impact of the valve core. The contact area between the valve core and the valve port of this invention continuously increases and the fit is tighter, forming a progressive sealing seal, which not only provides a good sealing effect but also extends the service life of the valve core and valve sleeve.

Description

Technical Field

[0001] This invention relates to the field of contact operating mechanism technology, specifically to a hydraulic control valve and a hydraulic operating mechanism. Background Technology

[0002] Hydraulic operating mechanisms are characterized by high output power, short action time, and smooth and noiseless operation. They are widely used in high-voltage circuit breakers, especially in ultra-high voltage and extra-high voltage circuit breakers, to drive the circuit breaker body to perform opening and closing actions. The hydraulic operating mechanism, in turn, controls the opening and closing process of the hydraulic operating mechanism through the hydraulic control valve, which is the core component.

[0003] The invention patent with authorization announcement number CN111173800B and authorization announcement date of 2021 / 09 / 17 discloses an electro-hydraulic control valve for a hydraulic operating mechanism, as well as its electromagnetic pilot valve and pilot valve. The electro-hydraulic control valve includes a main valve, which includes a valve body and end caps fixed at both ends of the valve body. The valve body has a cylindrical structure and a central hole. A constant high pressure oil port, a control oil port, and a constant low pressure oil port are sequentially arranged on the cylindrical wall of the valve body. The constant high pressure oil port, the control oil port, and the constant low pressure oil port are respectively connected to the central hole of the valve body. A low pressure chamber valve sleeve and a high pressure chamber valve sleeve are installed in the central hole. A valve core that can reciprocate between the low pressure chamber valve sleeve and the high pressure chamber valve sleeve is provided in the central hole. The two ends of the valve core form a first inner cavity and a second inner cavity with the low pressure chamber valve sleeve and the high pressure chamber valve sleeve, respectively. An oil passage for oil flow is provided on the side wall of the valve body. When the electro-hydraulic control valve is in open control, the high-pressure oil in the second inner cavity is discharged into the low-pressure oil tank through the normal and low-pressure oil ports. This causes the valve core to depressurize at the right end while moving to the right under the action of the high-pressure oil in the first inner cavity at the left end. At this time, the valve core contacts and seals with the valve sleeve of the high-pressure chamber, completing the open control action. When the electro-hydraulic control valve is in close control, the high-pressure oil enters the second inner cavity through the oil passage, thereby pushing the valve core to the left. At this time, the valve core contacts and seals with the valve sleeve of the low-pressure chamber, completing the close control action.

[0004] In the aforementioned patent, the structure and arrangement of the valve core, low-pressure chamber valve sleeve, high-pressure chamber valve sleeve, and three oil ports are basically the same as those of commonly used hydraulic control valves. The valve core contacts and seals with the low-pressure chamber valve sleeve or the high-pressure chamber valve sleeve. Although the specific structure of this contact position is not described in detail, based on the current products on the market, it is known that the contact area between the valve core and the valve sleeve is basically a right-angle contact seal or a bevel contact seal. However, under the frequent impact of high-pressure oil, this contact surface will experience wear between the valve core and the valve sleeve, resulting in poor sealing effect or even oil leakage. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic control valve and a hydraulic operating mechanism to solve the problem of poor sealing effect caused by valve core and valve sleeve contact wear in existing hydraulic control valves.

[0006] To solve the above problems, the hydraulic control valve of the present invention adopts the following technical solution: A hydraulic control valve includes a valve body, a valve sleeve and a valve core inside the valve body, a valve port on the valve sleeve, and a valve core for closing and opening the valve port. The valve core has a spherical sealing surface on the side facing the valve port. The valve port includes a conical segment and a cylindrical segment located at the end of the conical segment opposite to the valve core. The intersection line of the cylindrical segment and the conical segment forms a valve line. The valve line is used to seal and cooperate with the spherical sealing surface on the valve core and can form a mating spherical surface that seals and cooperates with the spherical sealing surface under the impact of the valve core.

[0007] Furthermore, valve sleeves are respectively provided at both ends of the valve body in the direction of movement of the valve core.

[0008] Furthermore, the valve sleeve can be detachably installed within the valve body.

[0009] Furthermore, each end of the valve body is provided with a socket, and the valve sleeve is composed of a sleeve body inserted into the socket and is pressed and fixed by an end cap provided at the end of the valve body.

[0010] Furthermore, the sleeve and the corresponding end cap are positioned and engaged by a positioning pin provided on the end face of the sleeve.

[0011] Beneficial Effects: The hydraulic control valve of this invention is an improved invention. The hydraulic control valve of this invention includes a valve body, within which a valve sleeve and a valve core are provided. One end of the valve core is embedded in the valve sleeve and can reciprocate along the inner hole of the valve sleeve, contacting or disconnecting with the valve port at the end of the valve sleeve to complete the opening or closing action of the hydraulic control valve. The valve line formed by the intersection of the conical and cylindrical sections of the valve port seals against the spherical sealing surface on the valve core. This line contact sealing effect is excellent. Moreover, under the continuous collision between the valve core and the valve port, a progressive sealing effect is formed between the valve core and the valve port. The valve line gradually transforms into a spherical surface that mates with the spherical sealing surface of the valve core, thereby continuously increasing the sealing contact area between the valve core and the valve port, and making the fit increasingly tighter. This reduces wear on the sealing surface between the valve core and the valve port, improves the contact sealing effect, and extends the service life of the valve core and the valve sleeve.

[0012] To solve the above problems, the present invention provides a hydraulic operating mechanism with the following technical solution: A hydraulic operating mechanism includes a hydraulic control valve. The hydraulic control valve includes a valve body, a valve sleeve and a valve core inside the valve body. The valve sleeve has a valve port. The valve core is used to close and open the valve port. The valve core has a spherical sealing surface on the side facing the valve port. The valve port includes a conical segment and a cylindrical segment located at the end of the conical segment opposite to the valve core. The intersection line of the cylindrical segment and the conical segment forms a valve line. The valve line is used to seal and cooperate with the spherical sealing surface on the valve core and can form a mating spherical surface that seals and cooperates with the spherical sealing surface under the impact of the valve core.

[0013] Furthermore, valve sleeves are respectively provided at both ends of the valve body in the direction of movement of the valve core.

[0014] Furthermore, the valve sleeve can be detachably installed within the valve body.

[0015] Furthermore, each end of the valve body is provided with a socket, and the valve sleeve is composed of a sleeve body inserted into the socket and is pressed and fixed by an end cap provided at the end of the valve body.

[0016] Furthermore, the sleeve and the corresponding end cap are positioned and engaged by a positioning pin provided on the end face of the sleeve.

[0017] Beneficial Effects: The hydraulic operating mechanism of this invention is an improved invention. The hydraulic operating mechanism of this invention includes a hydraulic control valve, which includes a valve body. The valve body contains a valve sleeve and a valve core. One end of the valve core is embedded in the valve sleeve and can reciprocate along the inner hole of the valve sleeve, contacting or disconnecting with the valve port at the end of the valve sleeve to complete the opening or closing action of the hydraulic control valve. The valve line formed by the intersection of the conical and cylindrical sections of the valve port seals against the spherical sealing surface on the valve core. This line contact sealing effect is excellent. Furthermore, under the continuous collision between the valve core and the valve port, a progressive sealing effect is formed between the valve core and the valve port. The valve line gradually transforms into a spherical surface that mates with the spherical sealing surface of the valve core, thereby continuously increasing the sealing contact area between the valve core and the valve port, and making the fit increasingly tighter. This reduces wear on the sealing surface between the valve core and the valve port, improves the contact sealing effect, and extends the service life of the valve core and the valve sleeve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the contact structure between the valve core and valve sleeve of the hydraulic control valve of the present invention. Figure 2 This is a schematic diagram illustrating the use of an embodiment of the hydraulic control valve of the present invention; Figure 3 for Figure 2 A magnified view of part A in the middle.

[0019] In the diagram: 1. Valve body; 2. Valve sleeve; 3. Valve core; 4. Valve port; 5. Spherical sealing surface; 6. Conical section; 7. Cylindrical section; 8. Valve line; 9. Sleeve body; 10. End cap; 11. Locating pin; 12. Glyd ring. Detailed Implementation

[0020] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0021] The hydraulic control valve of the present invention changes the right-angle contact between the valve core and the valve sleeve in the existing control valve to a valve line contact. Under the impact force of the valve core on the valve sleeve, the contact area between the conical section of the valve port and the spherical sealing surface of the valve core continuously increases. The spherical sealing surface of the valve core and the valve port make progressive contact sealing, which can ensure that the contact at the valve port becomes tighter and tighter, and the sealing effect becomes better and better.

[0022] As a basic solution, such as Figure 1-3As shown, a hydraulic control valve includes a valve body 1, within which a valve sleeve 2 and a valve core 3 are disposed. The valve body 1 serves as the main structure of the hydraulic control valve, accommodating oil passages, the valve sleeve 2 and valve core 3, and an oil port for connecting to the oil tank. The valve sleeve 2 within the valve body 1 acts as a support for the valve core 3, ensuring smooth movement of the valve core 3 within the valve sleeve 2 during valve opening and closing. The portion of the valve core 3 extending into the valve sleeve 2 is sealed to the valve sleeve 2 using a Glyd ring 12. The Glyd ring 12 is composed of a rubber O-ring and a polytetrafluoroethylene (PTFE) ring. Featuring a double-acting seal suitable for high-pressure environments, the PTFE ring provides low frictional resistance and excellent wear resistance, ensuring that the Glyd ring 12 exhibits virtually no creeping. The Glyd ring 12 also possesses the excellent corrosion resistance of both rubber and PTFE, preventing corrosion damage from prolonged contact with oil. The valve sleeve 2 is equipped with a valve port 4, and the valve core 3 is used to close and open the valve port 4. The flow direction or flow rate of the fluid within the valve body 1 can be controlled through the valve port 4. By utilizing different sealing contacts or disconnections between the valve port 4 and the valve core 3, hydraulic control can be achieved. The valve core 3, which controls the opening and closing of the valve, has a spherical sealing surface 5 on the side facing the valve port 4. The spherical sealing surface 5 has a smooth transition, which avoids the problem of poor sealing between the valve core 3 and the valve port 4 due to sharp edges on the contact surface, caused by continuous wear. The valve port 4 includes a conical section 6 and a cylindrical section 7 located at the end of the conical section 6 opposite to the valve core 3. The conical section 6 makes the valve port 4 an open, obtuse-angled shape, which is more conducive to the sealing between the valve port 4 and the spherical sealing surface 5 of the valve core 3. The intersection line of the cylindrical section 7 and the conical section 6 forms... The valve line 8, a portion of the valve core 3, extends into the valve sleeve 2 and contacts the cylindrical section 7 of the valve port 4. The valve line 8 contacts and seals with the spherical sealing surface 5 of the valve core 3. At this time, it is a line contact seal. Under the action of fluid pressure, the valve core 3 will move back and forth and frequently impact the valve line 8. Therefore, the valve line 8 is used to seal and cooperate with the spherical sealing surface 5 on the valve core 3. Under the impact of the valve core 3, a mating spherical surface that seals and cooperates with the spherical sealing surface 5 can be formed. This progressive impact contact makes the valve core 3 fit more tightly with the valve port 4, thus improving the sealing effect.

[0023] As a preferred implementation method, such as Figure 2-3 As shown, valve sleeves 2 are respectively provided at both ends of the valve core 3 in the direction of movement within the valve body 1. The valve core 3 can reciprocate between the two valve sleeves 2 under fluid pressure, thereby completing the opening or closing action of the hydraulic control valve. Furthermore, the contact seal between the valve core 3 and the two valve sleeves 2 is a spherical seal to ensure good and stable sealing at both ends. In other embodiments, a single valve sleeve 2 can be used in conjunction with the valve core 3 according to the specific structure of different hydraulic control valves, which has a wide range of applicability and will not affect the performance of the spherical seal structure.

[0024] In a preferred embodiment, the valve sleeve 2 is detachably installed inside the valve body 1. This detachable connection allows for the inspection or replacement of the valve sleeve 2 or valve body 1 and its internal valve core 3 without disassembling or damaging other components in the hydraulic control valve. This simplifies the maintenance process. Furthermore, for components prone to wear, which require periodic inspection or replacement due to long-term wear, the detachable connection allows for the individual removal of the replacement component without scrapping the entire hydraulic control valve. This extends the service life of the hydraulic control valve, thereby reducing downtime and maintenance costs. In other embodiments, the detachable connection is not provided. Although this results in a shorter overall service life for the hydraulic control valve compared to this embodiment, it does not affect the normal operation of the hydraulic control valve.

[0025] As a preferred implementation method, such as Figure 2 As shown, the valve body 1 has sockets at both ends. The valve sleeve 2 is composed of a sleeve 9 inserted into the socket and is pressed and fixed by an end cap 10 at the end of the valve body 1. Pressing the sleeve 9 into the socket of the valve body 1 through the end cap 10 can limit the valve sleeve 2 to the required position, preventing deviations in the installation distance of the sleeve 9 within the valve body 1, which would affect the pressure value of the fluid in the valve cavity and prevent it from meeting the required standard setting value. The sleeve 9 and the corresponding end cap 10 are positioned and engaged by a positioning pin 11 on the end face of the sleeve 9. Using the positioning pin 11, the end cap 10 and the sleeve 9 can be precisely aligned, providing good centering and achieving the desired effect. The sleeve 9 has a certain degree of error prevention, ensuring the accuracy of its assembly position in the socket. It also avoids deviations when the end cap 10 is connected to the sleeve 9. The end cap 10 presses the sleeve 9 into the set position inside the valve body 1. The end cap 10 and the valve body 1 can be connected by bolts or other connection methods, so that the end cap 10 stops and limits the valve sleeve 2, preventing the valve sleeve 2 from gradually sliding out of the valve body 1 under the action of fluid pressure inside the valve body 1. In other embodiments, a shoulder can be provided on the sleeve 9. The shoulder can stop and cooperate with the end face of the valve body 1, and the shoulder can be connected to the valve body 1 to prevent the sleeve 9 from moving. This implementation method can also avoid the problem of deviation in the assembly position of the sleeve 9 during assembly.

[0026] The hydraulic control valve of this invention operates as follows: Figure 2-3 As shown, a pressure difference is formed by high-pressure oil or other fluid in the valve body 1 and valve sleeve 2 of the hydraulic control valve. The inner cavity of the valve body 1 and the inner cavity of the valve sleeve 2 are connected through a flow channel. Under the action of the pressure difference, the valve core 3 is driven to move towards the low pressure direction. At this time, the valve core 3 separates from or contacts the valve port 4 of the valve sleeve 2 to seal, thus completing the opening or closing control of the hydraulic control valve.

[0027] An embodiment of the hydraulic operating mechanism of the present invention is as follows: A hydraulic operating mechanism includes a hydraulic control valve, wherein embodiments of the hydraulic control valve have been described above and will not be repeated here.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A hydraulic control valve, comprising a valve body, wherein a valve sleeve and a valve core are disposed within the valve body, a valve port is provided on the valve sleeve, and the valve core is used to close and open the valve port, characterized in that, The valve core has a spherical sealing surface on the side facing the valve port. The valve port includes a conical segment and a cylindrical segment located at the end of the conical segment opposite to the valve core. The intersection line of the cylindrical segment and the conical segment forms the valve line. The valve line is used to seal and cooperate with the spherical sealing surface on the valve core and can form a mating spherical surface that seals and cooperates with the spherical sealing surface under the collision action of the valve core.

2. The hydraulic control valve according to claim 1, characterized in that, The valve body is provided with valve sleeves at both ends in the direction of movement of the valve core.

3. The hydraulic control valve according to claim 1 or 2, characterized in that, The valve sleeve can be detachably installed inside the valve body.

4. The hydraulic control valve according to claim 3, characterized in that, The valve body has sockets at both ends, and the valve sleeve is formed by a sleeve that is inserted into the socket and is pressed and fixed by an end cap at the end of the valve body.

5. The hydraulic control valve according to claim 4, characterized in that, The sleeve and the corresponding end cap are positioned and fitted by a positioning pin provided on the end face of the sleeve.

6. A hydraulic operating mechanism, comprising a hydraulic control valve, characterized in that, The hydraulic control valve includes a valve body, a valve sleeve and a valve core inside the valve body. The valve sleeve has a valve port, and the valve core is used to close and open the valve port. The valve core has a spherical sealing surface on the side facing the valve port. The valve port includes a conical segment and a cylindrical segment located at the end of the conical segment opposite to the valve core. The intersection line of the cylindrical segment and the conical segment forms a valve line. The valve line is used to seal and cooperate with the spherical sealing surface on the valve core and can form a mating spherical surface that seals and cooperates with the spherical sealing surface under the collision action of the valve core.

7. The hydraulic operating mechanism according to claim 6, characterized in that, The valve body is provided with valve sleeves at both ends in the direction of movement of the valve core.

8. The hydraulic operating mechanism according to claim 6 or 7, characterized in that, The valve sleeve can be detachably installed inside the valve body.

9. The hydraulic operating mechanism according to claim 8, characterized in that, The valve body has sockets at both ends, and the valve sleeve is formed by a sleeve that is inserted into the socket and is pressed and fixed by an end cap at the end of the valve body.

10. The hydraulic operating mechanism according to claim 9, characterized in that, The sleeve and the corresponding end cap are positioned and fitted by a positioning pin provided on the end face of the sleeve.

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