Valve core of control valve for hydraulic operating mechanism

Abstract

The utility model relates to a control valve core for a hydraulic operating mechanism, which comprises a small valve core and a large valve core, the large valve core comprises a large valve core rod, a second piston part and a third piston part, the second piston part and the third piston part are fixedly connected at two ends of the large valve core rod respectively, and the small valve core comprises a small valve core rod and a first piston part fixedly connected at one end of the small valve core rod. The other end of the small valve element rod is inserted into a connecting counter bore in the end of the second piston part, an impact end is arranged at the end of the first piston part, a communicating hole channel is formed between the small valve element and the large valve element, and the communicating hole channel communicates with the outer ring of the impact end and the side, close to the large valve element rod, of the second piston part. The large valve element and the small valve element which are split are arranged, so that the machining difficulty of the valve element of the control valve is reduced, the coaxiality between the piston parts is improved, the valve element of the control valve can move smoothly to achieve opening and closing operation, the impact end is arranged, oil holes are formed in the outer ring, and the service life of the valve element of the control valve is prolonged. Therefore, the ejector rod pushes the valve core of the control valve to move.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic operating mechanism control valve technology, specifically to a control valve core for a hydraulic operating mechanism. Background Technology

[0002] With the expansion of power system scale and the rapid growth of grid load, short-circuit currents in power systems are increasing year by year, and large short-circuit currents have threatened the safe operation of grid equipment. To quickly disconnect fault short-circuit currents and better protect grid equipment, fast circuit breakers have become a hot topic of attention and research in the industry in recent years. High-voltage and ultra-high-voltage fast circuit breakers require high-power, fast-acting hydraulic operating mechanisms, and the development of fast-acting control valves is key to achieving the rapid action function of these operating mechanisms.

[0003] Hydraulic operating mechanisms use control valves to switch between open and closed states through the movement of the valve core. For example, utility model patent application number 201520458007.8 discloses a control valve and a circuit breaker hydraulic operating mechanism using the control valve, and invention patent application number 202011246792.2 discloses a hydraulic operating mechanism and a hydraulic control valve. In the above patents, the switching between open and closed states is achieved through the movement of the valve core.

[0004] Current control valve spools are typically open at one end. To achieve rapid tripping of the hydraulic operating mechanism, a push rod can be used to move the control valve spool quickly. However, when the push rod moves the control valve spool, it blocks the opening, affecting the normal flow of oil. In addition, because the control valve spool is a slender rod, it is difficult to manufacture and requires heat treatment. During the manufacturing and heat treatment processes, it is difficult to ensure the coaxiality of all parts of the spool. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a control valve core for a hydraulic operating mechanism.

[0006] This utility model is achieved through the following technical solution: a control valve core for a hydraulic operating mechanism is provided, including a small valve core and a large valve core. The large valve core includes a large valve core rod and a second piston portion and a third piston portion respectively fixed to both ends of the large valve core rod. The small valve core includes a small valve core rod and a first piston portion fixed to one end of the small valve core rod. The other end of the small valve core rod is inserted into a countersunk hole at the end of the second piston portion. The end of the first piston portion is provided with an impact end. A connecting channel is opened between the small valve core and the large valve core. The connecting channel connects the outer ring of the impact end and the side of the second piston portion near the large valve core rod.

[0007] As an optimization, the end face of the small valve core rod inserted into the connecting countersunk hole has a small valve core countersunk hole, the bottom of the connecting countersunk hole has a large valve core countersunk hole, the impact end has a small valve core radial hole that connects to the small valve core countersunk hole, and the side of the second piston part near the large valve core rod has a large valve core radial hole that connects to the large valve core countersunk hole.

[0008] As an optimization, the small valve core radial holes and the large valve core radial holes are each provided in multiple and arranged circumferentially.

[0009] As an optimization, the impact end is frustum-shaped and the radial hole of the small valve core is perpendicular to the outer ring of the impact end.

[0010] As an optimization, the second piston part is provided with a shoulder on the side near the large valve core rod, and the outer ring of the shoulder is a tapered surface and perpendicular to the radial hole of the large valve core.

[0011] As an optimization, the second piston portion includes a stop portion and a first insertion portion and a second insertion portion located at both ends of the stop portion, wherein the diameters of the first insertion portion and the second insertion portion are both smaller than the diameter of the stop portion.

[0012] As an optimization, the small valve core rod is provided with an insertion part that matches the connecting countersunk hole, and a sealing ring is installed on the insertion part.

[0013] As an optimization, a buffer end is provided on the end face of the third piston portion.

[0014] As an optimization, a retaining portion is provided on the end face of the buffer end, and a retaining slope is provided on the outer ring of the retaining portion.

[0015] The beneficial effects of this utility model are as follows: The control valve core for the hydraulic operating mechanism of this utility model reduces the processing difficulty of the control valve core by setting a separate large valve core and a small valve core, improves the coaxiality between the piston parts, and enables the control valve core to move smoothly to realize the opening and closing operation. In addition, an impact end is set and the oil port is set in the outer ring position, thereby realizing the operation of pushing the control valve core to move by the push rod. Attached Figure Description

[0016] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the small valve core of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the large valve core of this utility model;

[0019] Figure 4 This is a schematic diagram of the usage state of this utility model;

[0020] As shown in the figure:

[0021] 1. Small valve core rod; 2. First piston section; 3. Small valve core countersunk hole; 4. Impact end; 5. Small valve core radial hole; 6. Large valve core rod; 7. Second piston section; 71. Stop section; 72. First insertion section; 73. Second insertion section; 8. Third piston section; 9. Buffer end; 10. Holding slope; 11. Large valve core radial hole; 12. Large valve core countersunk hole; 13. Shoulder; 14. Connecting countersunk hole; 15. Insertion section; 16. Push rod; 17. Holding section. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0023] like Figures 1-4 As shown, the control valve core for a hydraulic operating mechanism of this utility model includes a small valve core and a large valve core that are detachably connected and coaxial, such as... Figure 1 As shown, the large valve core is on the right and the small valve core is on the left.

[0024] like Figure 3 As shown, the large valve core includes a large valve core rod 6 and a second piston portion 7 and a third piston portion 8 respectively fixed to both ends of the large valve core rod 6. The second piston portion 7 and the third piston portion 8 are integrally formed with the large valve core rod 6. The second piston portion 7 includes a stop portion 71 and a first insertion portion 72 and a second insertion portion 73 respectively located at both ends of the stop portion 71. The first insertion portion 72, the second insertion portion 73 and the stop portion 71 are all cylindrical. The diameters of the first insertion portion 72 and the second insertion portion 73 are both smaller than the diameter of the stop portion 71, so that when the first insertion portion 72 and the second insertion portion 73 are inserted into the valve seat, the stop portion 71 can achieve a stopping effect.

[0025] The large valve core rod 6 is a round rod, and the outer ring of the third piston part 8 is equipped with a sealing ring for sealing. A buffer end 9 is provided on the end face of the third piston part 8. The buffer end 9 is used for buffering when the control valve core moves in the opening direction.

[0026] The buffer end 9 has a retaining part 17 on its end face. The retaining part 17 is a round rod and is coaxial with the large valve core rod 6. The retaining part 17 has a retaining inclined surface 10 on its outer ring. The retaining inclined surface 10 is arranged in a ring around the outer ring of the retaining part 17. Under the zero pressure state of the entire control valve, the spring presses against the retaining inclined surface 10 radially, which can prevent the valve core of the control valve from moving axially.

[0027] like Figure 2 As shown, the small valve core includes a small valve core rod 1 and a first piston part 2 fixed to one end of the small valve core rod 1. The small valve core rod 1 is cylindrical, and the first piston part 2 is integrally formed with the small valve core rod 1. A sealing ring is installed on the outer ring of the first piston part 2.

[0028] The end of the second piston section 7, that is, the end face away from the large valve core rod 6, has a cylindrical connecting countersunk hole 14.

[0029] The other end of the small valve core rod 1 is provided with an insertion part 15 that is adapted to the connecting countersunk hole 14. The insertion part 15 is inserted into the connecting countersunk hole 14 at the end of the second piston part 7.

[0030] The insertion part 15 is equipped with a sealing ring to achieve a seal at the connection between the large valve core and the small valve core. Since the left side of the first piston part 2 and the right side of the second piston part 7 are both high-pressure oil when the control valve core is in use, the pressure will prevent the large valve core and the small valve core from separating.

[0031] The first piston part 2 has an impact end 4 at its end. The impact end 4 is frustoconical and integrally formed with the first piston part 2. The second piston part 7 has a shoulder 13 on the side near the large valve core rod 6. The outer ring of the shoulder 13 is tapered and integrally formed with the large valve core rod 6 and the second piston part 7.

[0032] A connecting channel is provided between the small valve core and the large valve core, and the connecting channel connects the outer ring of the impact end 4 and the side of the second piston part 7 near the large valve core rod 6.

[0033] Specifically, the end face of the small valve core rod 1 that is inserted into the connecting countersunk hole 14 has a small valve core countersunk hole 3, the bottom of the connecting countersunk hole 14 has a large valve core countersunk hole 12, the impact end 4 has a small valve core radial hole 5 that connects to the small valve core countersunk hole 3, and the side of the second piston part 7 near the large valve core rod 6 has a large valve core radial hole 11 that connects to the large valve core countersunk hole 12. The small valve core radial hole 5, the small valve core countersunk hole 3, the large valve core countersunk hole 12, and the large valve core radial hole 11 form a connecting channel, so that the left side of the first piston part 2 and the right side of the second piston part 7 are connected and both are high-pressure oil.

[0034] The small valve core radial holes 5 are provided in multiple and arranged circumferentially. In order to facilitate the drilling operation of the small valve core radial holes 5, the small valve core radial holes 5 are perpendicular to the outer ring of the impact end 4.

[0035] The large valve core has multiple radial holes 11 arranged circumferentially. To facilitate drilling operations of the large valve core radial holes 11, the large valve core radial holes 11 are perpendicular to the outer ring of the shoulder 13.

[0036] How to use this utility model:

[0037] The left side of the first piston section 2 is the first hydraulic chamber, the right side of the second piston section 7 is the second hydraulic chamber, and the right side of the third piston section 8 is the third hydraulic chamber. The movement of the control valve spool is achieved by changing the oil pressure in the third hydraulic chamber. Alternatively, it can be achieved through… Figure 4 The push rod 16 on the left side pushes the control valve core to move to the right to open the circuit.

[0038] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A control valve core for a hydraulic operating mechanism, characterized in that: The device includes a small valve core and a large valve core. The large valve core includes a large valve core rod (6) and a second piston part (7) and a third piston part (8) respectively fixed at both ends of the large valve core rod (6). The small valve core includes a small valve core rod (1) and a first piston part (2) fixed at one end of the small valve core rod (1). The other end of the small valve core rod (1) is inserted into the connecting countersunk hole (14) at the end of the second piston part (7). The end of the first piston part (2) is provided with an impact end (4). A connecting channel is opened between the small valve core and the large valve core. The connecting channel connects the outer ring of the impact end (4) and the side of the second piston part (7) near the large valve core rod (6).

2. The valve core for a hydraulic operating mechanism according to claim 1, characterized in that: The small valve core rod (1) has a small valve core countersunk hole (3) on the end face of the connecting countersunk hole (14), a large valve core countersunk hole (12) is opened at the bottom of the connecting countersunk hole (14), a small valve core radial hole (5) is opened on the impact end (4) and connects to the small valve core countersunk hole (3), and a large valve core radial hole (11) is opened on the side of the second piston part (7) near the large valve core rod (6) and connects to the large valve core countersunk hole (12).

3. The valve core for a hydraulic operating mechanism according to claim 2, characterized in that: The small valve core radial holes (5) and the large valve core radial holes (11) are each provided in multiple and arranged circumferentially.

4. The valve core of a control valve for a hydraulic operating mechanism according to claim 2, characterized in that: The impact end (4) is frustum-shaped and the radial hole (5) of the small valve core is perpendicular to the outer ring of the impact end (4).

5. The valve core for a hydraulic operating mechanism according to claim 2, characterized in that: The second piston part (7) has a shoulder (13) on the side near the large valve core rod (6). The outer ring of the shoulder (13) is a tapered surface and is perpendicular to the radial hole (11) of the large valve core.

6. The valve core for a hydraulic operating mechanism according to claim 1, characterized in that: The second piston part (7) includes a stop part (71) and a first insertion part (72) and a second insertion part (73) located at both ends of the stop part (71), wherein the diameter of the first insertion part (72) and the second insertion part (73) is smaller than the diameter of the stop part (71).

7. The valve core for a hydraulic operating mechanism according to claim 1, characterized in that: The small valve core rod (1) is provided with an insertion part (15) that is adapted to the connecting countersunk hole (14), and a sealing ring is installed on the insertion part (15).

8. The valve core of a control valve for a hydraulic operating mechanism according to claim 1, characterized in that: The end face of the third piston part (8) is provided with a buffer end (9).

9. The valve core for a hydraulic operating mechanism according to claim 8, characterized in that: The buffer end (9) has a retaining part (17) on its end face, and the retaining part (17) has a retaining slope (10) on its outer ring.

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