A hydraulic mechanism control valve with adjustable opening time

Abstract

The present invention discloses a hydraulic mechanism control valve with adjustable opening time, comprising a control oil passage, an opening solenoid valve, a closing solenoid valve, a secondary reversing valve and a flow regulating device; the opening solenoid valve is provided with two, a closing solenoid valve is provided on one side of the opening solenoid valve, and the opening solenoid valve and the closing solenoid valve are both connected to the control oil passage; the control oil passage is provided with a plurality of branches, one of which is connected to the secondary reversing valve, the control oil passage is connected to one end of the flow regulating device, and the other end of the flow regulating device is connected to a fastening device. The problem of unstable opening time in the prior art and the adaptability to circuit breakers of different specifications are effectively solved.

Description

Technical Field

[0001] The invention relates to the field of circuit breakers, and in particular to a hydraulic mechanism control valve with adjustable opening time. Background Art

[0002] As a type of circuit breaker operating mechanism, the hydraulic operating mechanism is also the power source of the circuit breaker. It is an operating mechanism that uses hydraulic oil as the working medium to transmit power. As an important control and protection element of the power system, the circuit breaker can close, carry and disconnect the current under normal circuit conditions, and can close and carry and disconnect the current under abnormal circuit conditions within a specified time. As a type of circuit breaker operating mechanism, the hydraulic operating mechanism is also the power source of the circuit breaker. It is an operating mechanism that uses hydraulic oil as the working medium to transmit power. The hydraulic operating mechanism is one of the commonly used power elements of the circuit breaker. The function of its key component, the control valve, is to control the solenoid valve of the circuit breaker to close or open according to the signal command, control the reversing of the secondary reversing valve, switch the main oil circuit of the hydraulic mechanism to connect or disconnect with the system, drive the main piston rod of the hydraulic mechanism to make a rapid extension or retraction action, and then drive the moving parts of the circuit breaker to realize the basic function of closing or opening the circuit breaker.

[0003] Since the matching of mechanical characteristics of the circuit breaker and the hydraulic operating mechanism of the non-original matching design may have a certain deviation, some characteristics need to be adjusted to meet the requirements. The present invention only adjusts the opening time of the circuit breaker.

[0004] Since the definition interval of the circuit breaker opening time refers to the moment when the opening solenoid valve receives the opening command and is energized to the moment when the contacts of the moving parts of the circuit breaker are disconnected from the contacts of the stationary parts (the just-opening point), and does not include the subsequent high-speed breaking movement process of the moving parts of the circuit breaker, the opening time cannot be completely adjusted by adjusting the opening throttling speed regulating valve on the main oil circuit of the control valve. The opening time can only be adjusted by adjusting the action time of the solenoid valve.

[0005] At present, the adjustment of the opening time of the hydraulic operating mechanism of the circuit breaker is achieved by adding a throttling pad to the oil port of the two-way opening solenoid valve. The aperture of the small hole in the center of the throttling pad has different specifications. Generally, a hydraulic mechanism is adapted to a certain circuit breaker, and the throttling pad selection specifications are fixed. The throttling pad controls the opening time of the solenoid valve port by limiting the oil flow of the solenoid valve, thereby controlling the action time of the solenoid valve, and then plays a role in adjusting the opening time. The smaller the aperture of the throttling pad is, the longer the opening time is. There is an adjustment gradient when adding a throttling pad to the opening solenoid valve to adjust the opening time. The smaller the aperture of the throttling pad is, the longer the opening time is. When the aperture of the throttling pad is small to a certain extent, it is easily affected by factors such as oil viscosity and aperture size dispersion, and the opening time will become unstable. When the circuit breaker is equipped for factory characteristic testing, it is sometimes necessary to replace and adjust it multiple times. There are problems such as non-professionals are not easy to operate, which is time-consuming and laborious. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a hydraulic mechanism control valve with adjustable opening time, which effectively solves the problem of unstable opening time in the prior art and the adaptability to circuit breakers of different specifications.

[0007] The present invention is achieved through the following technical solutions:

[0008] A hydraulic mechanism control valve with adjustable opening time, comprising a control oil channel, an opening solenoid valve, a closing solenoid valve, a secondary reversing valve and a flow regulating device; two opening solenoid valves are provided, a closing solenoid valve is provided on one side of the opening solenoid valve, and both the opening solenoid valve and the closing solenoid valve are connected to the control oil channel; the control oil channel is provided with a plurality of branches, one of the branches of the control oil channel is connected to the secondary reversing valve, the control oil channel is connected to one end of the flow regulating device, and the other end of the flow regulating device is connected to a fastening device.

[0009] Furthermore, the flow regulating device includes a throttle valve sleeve and a flow regulating rod, the control oil channel, the throttle valve sleeve and the flow regulating rod are connected in sequence, the throttle valve sleeve and the flow regulating rod are coaxially arranged, one side of the flow regulating rod is connected to the oil channel, and the flow regulating rod is arranged in the hole.

[0010] Furthermore, the outer side of the throttle valve sleeve is connected to a first sealing structure.

[0011] Furthermore, the outer side of the flow regulating rod is connected to a second sealing structure.

[0012] Furthermore, the interior of the throttle valve sleeve is configured as a through-hole structure, and a mating surface is provided at one end of the through-hole structure close to the flow regulating rod.

[0013] Furthermore, the two ends of the flow regulating rod have different diameters, wherein the end with the smaller diameter is connected to the throttle valve sleeve, and the end with the smaller diameter is provided with a matching surface.

[0014] Furthermore, the throttle valve sleeve and the flow regulating rod have connecting ends with matching surfaces that match, and a gap is provided between the matching surfaces of the throttle valve sleeve and the flow regulating rod.

[0015] Furthermore, the fastening device comprises a gland flange and a nut; the gland flange and the flow regulating rod are coaxially arranged; and the flow regulating rod, the gland flange and the nut are connected in sequence.

[0016] Furthermore, the first sealing structure adopts a sealing ring.

[0017] Furthermore, the matching surface is configured as a conical surface.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The present invention provides a hydraulic mechanism control valve with adjustable opening time. A flow regulating device is added at one end of the control oil channel. By adjusting the oil flow rate of the control solenoid valve, the action time of the solenoid valve is changed when the circuit breaker performs an opening operation, thereby achieving the purpose of adjusting the circuit breaker opening time.

[0020] Furthermore, in the prior art, the circuit breaker opening time is adjusted by replacing throttling pads with different apertures, while the present invention avoids the use of a linear gap formed by a circular hole and a cone by forming a gap between the mating surfaces, thereby increasing the damping of the oil pressure flow and facilitating the continuous adjustment of the circuit breaker opening time.

[0021] Furthermore, the fastening device used in the present invention is adjusted by screwing the thread and locked by the nut, without the risk of leakage, and is convenient for non-professionals to operate, saving time and manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the overall structure of a hydraulic mechanism control valve with adjustable opening time provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a partially enlarged structure of a hydraulic mechanism control valve with adjustable opening time provided in an embodiment of the present invention;

[0025] In the figure: control oil channel 1, hole 2, throttle valve sleeve 3, flow adjustment rod 4, gland flange 5, nut 6, first sealing structure 7, second sealing structure 8, gap 9, closing solenoid valve 10, opening solenoid valve 11, and secondary reversing valve 12. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] The present invention discloses a hydraulic mechanism control valve with adjustable opening time, comprising a control oil passage 1, a hole 2, a throttle valve sleeve 3, a flow regulating rod 4, a gland flange 5, a nut 6, a first sealing structure 7, a second sealing structure 8, a gap 9, a closing solenoid valve 10, an opening solenoid valve 11, and a secondary reversing valve 12.

[0033] The control oil passage 1 is connected to a flow regulating device, which is arranged in the hole 2 and includes a throttle valve sleeve 3, a flow regulating rod 4, a gland flange 5, and a nut 6.

[0034] The throttle valve sleeve 3 is provided with a through hole at its center, wherein one end connected to the flow regulating rod 4 is provided with a matching surface, and the matching surface is set as a conical surface; the conical surface is connected to the lower end surface of the hole 2.

[0035] The outer side of the throttle valve sleeve 3 is surrounded by a first sealing structure 7, which adopts an O-ring retaining ring; the flow regulating rod 4 is installed in the hole 2, and the bottom of the flow regulating rod 4 is provided with a matching surface that matches the throttle valve sleeve 3, and the matching surface adopts a conical surface in this embodiment.

[0036] The flow regulating rod 4 is coaxially connected with the throttle valve sleeve 3, and a second sealing structure 8 is arranged around the outer side of the flow regulating rod 4. The rear end of the flow regulating rod 4 is provided with an external thread structure, and the thread structure is connected with the fastening structure. In the specific implementation, a wrench can be used to tighten; the flow regulating rod 4 is connected with the gland flange 5 and the nut 6 in sequence, and the flow regulating rod 4 is coaxially arranged with the gland flange 5 and the nut 6; the flow regulating device includes a coaxial assembly of the throttle valve sleeve 3 and the flow regulating rod 4; the conical end structure of the flow regulating rod 4 is inserted into the annular matching surface gap formed by the conical hole of the throttle valve sleeve 3, and a first sealing structure 7 is arranged around the outer side of the throttle valve sleeve 3, and the first sealing structure 7 ensures that the oil can only pass through the center, and the flow regulating rod 4 is screwed together to realize axial movement, and the nut 6 is locked to maintain the sensitivity of the adjustment, and the sealing between the internal oil pressure and the external air is realized through the second sealing structure 8.

[0037] During specific use, the flow regulating device can continuously change the size of the cone structure fitting gap 9 by rotating the flow regulating rod 4 forward or backward, and control the change of the oil flow rate of the two-way opening solenoid valve, thereby changing the action time of the opening solenoid valve 11, and realizing continuous adjustment of the circuit breaker opening time. The closing solenoid valve 10 adopts a first-level pilot closing solenoid valve; the opening solenoid valve 11 adopts a first-level pilot opening solenoid valve.

[0038] The opening solenoid valve 11, the secondary reversing valve 12 and the closing solenoid valve 10, the opening solenoid valve 11 is provided with two switching control oil circuits through the closing solenoid valve 10 or the opening solenoid valve 11, controlling the secondary reversing valve 12 to switch, driving the main piston rod of the hydraulic mechanism to make a rapid extension or retraction action; the flow regulating device is used for the opening action time of the closing solenoid valve 10.

[0039] On a specific hydraulic operating mechanism, by setting a circuit breaker opening time control valve and a working piston provided by the present invention, including a control valve that can adjust the action time of the opening solenoid valve, the opening action of the main piston rod of the hydraulic mechanism is controlled to achieve the adjustment of the circuit breaker opening time.

[0040] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic mechanism control valve with adjustable opening time, characterized in that: The invention comprises a control oil passage (1), an opening solenoid valve (11), a closing solenoid valve (10), a secondary reversing valve (12) and a flow regulating device; two opening solenoid valves (11) are provided, a closing solenoid valve (10) is provided on one side of the opening solenoid valve (11), and both the opening solenoid valve (11) and the closing solenoid valve (10) are in communication with the control oil passage (1); the control oil passage (1) is provided with a plurality of branches, one of which is connected to the secondary reversing valve (12), the control oil passage (1) is connected to one end of the flow regulating device, and the other end of the flow regulating device is connected to a fastening device; the flow regulating device comprises a throttle valve sleeve (3) and a flow regulating rod (4); the control oil passage (1) 1), a throttle valve sleeve (3) and a flow regulating rod (4) are connected in sequence, the throttle valve sleeve (3) and the flow regulating rod (4) are coaxially arranged, one side of the flow regulating rod (4) is connected to the oil passage, and the flow regulating rod (4) is arranged in the hole (2); the interior of the throttle valve sleeve (3) is arranged as a through hole structure, and the through hole structure is provided with a mating surface at one end close to the flow regulating rod (4); the two ends of the flow regulating rod (4) have different diameters, wherein the end with a smaller diameter is connected to the throttle valve sleeve (3), and the end with a smaller diameter is provided with a mating surface; the connection ends of the throttle valve sleeve (3) and the flow regulating rod (4) with the mating surfaces are matched, and a gap (9) is provided between the mating surfaces of the throttle valve sleeve (3) and the flow regulating rod (4).

2. A hydraulic mechanism control valve with adjustable opening time according to claim 1, characterized in that: The outer side of the throttle valve sleeve (3) is connected to a first sealing structure (7).

3. A hydraulic mechanism control valve with adjustable opening time according to claim 2, characterized in that: The first sealing structure (7) adopts a sealing ring.

4. A hydraulic mechanism control valve with adjustable opening time according to claim 1, characterized in that: The outer side of the flow regulating rod (4) is connected to a second sealing structure (8).

5. The hydraulic mechanism control valve with adjustable opening time according to claim 1, characterized in that: The fastening device comprises a gland flange (5) and a nut (6); the gland flange (5) and the flow regulating rod (4) are coaxially arranged; and the flow regulating rod (4), the gland flange (5) and the nut (6) are connected in sequence.

6. The hydraulic mechanism control valve with adjustable opening time according to claim 1, characterized in that: The matching surface is configured as a conical surface.

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