Time delay device and hydraulic operating mechanism using same

Abstract

The invention relates to the field of operating mechanisms with time-delay devices, in particular to a time-delay device and a hydraulic operating mechanism using the time-delay device. The time delay device comprises a piston cylinder and an auxiliary switch used for being connected to a corresponding opening control loop in series, a piston matched with the piston cylinder in a sliding and sealing mode is arranged in the piston cylinder, the auxiliary switch comprises a moving contact, an ejector rod matched with the moving contact is arranged on one side of the piston, a spiral spring is arranged on the ejector rod, and the spiral spring is connected with the piston cylinder in a sliding and sealing mode. A sleeve matched with the spiral spring is arranged at the end, on the same side with the ejector rod, in the piston cylinder, the sleeve is in threaded fit with the piston cylinder, a rodless cavity is formed in the side, opposite to the ejector rod, in the piston cylinder, and an oil hole communicated with the rodless cavity is formed in the piston cylinder. According to the time delay device, the on-off interval of the hydraulic operating mechanism can be adjusted more quickly and accurately, and the debugging efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of operating mechanisms with delay devices, in particular to a delay device and a hydraulic operating mechanism using the delay device. Background Art

[0002] In order to ensure the safe and stable operation of the high-voltage transmission network, the high-voltage circuit breaker needs to have a self-defense delay function, that is, the closing and opening intervals of the circuit breaker need to be controlled during the closing and opening operations. After the circuit breaker is closed, it can only be opened after the arc extinguishing chamber returns to normal. The circuit breaker delay function can be realized through an external delay relay or through the hydraulic operating mechanism itself. Under normal circumstances, the hydraulic operating mechanism itself is generally required to have a delay function. A micro switch is connected in series in the opening control circuit so that the conduction of the micro switch lags behind the closing process of the hydraulic operating mechanism to achieve the delay function.

[0003] The Chinese invention patent application with application publication number CN104319120A and application publication date January 28, 2015 discloses a time delay device, which includes a hydraulic cylinder and an auxiliary switch arranged in series in a switch-off control circuit, the auxiliary switch includes a moving contact, a piston is arranged in the hydraulic cylinder, a push rod is arranged on one side of the piston to cooperate with the moving contact of the auxiliary switch, the auxiliary switch is arranged at one end of the hydraulic cylinder on the same side as the push rod, a throttle valve is arranged at the end of the hydraulic cylinder facing away from the push rod, an oil circuit is arranged in the hydraulic cylinder to communicate with the oil chamber of the operating mechanism, the push rod pushes the moving contact of the auxiliary switch under the action of oil pressure to close the auxiliary switch, and the hydraulic operating mechanism can be opened only after the auxiliary switch is closed, thereby achieving a time delay effect, and the movement time of the push rod can be controlled by adjusting the throttle valve to control the flow of oil. However, the oil circuit on the time delay device is relatively thin, and there is still a problem that the throttle valve needs to be adjusted very accurately when adjusting the movement time of the push rod, which is difficult to adjust and has low debugging efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a delay device to solve the problem that the existing delay device needs to accurately adjust the throttle valve when adjusting the delay and the debugging efficiency is low; the purpose of the present invention is also to provide a hydraulic operating mechanism using the delay device.

[0005] To achieve the above purpose, the delay device of the present invention adopts the following technical solutions:

[0006] The time delay device comprises a piston cylinder and an auxiliary switch connected in series to a corresponding opening control circuit, wherein a piston is provided in the piston cylinder and cooperates with the piston cylinder in a sliding seal, the auxiliary switch comprises a moving contact, a push rod cooperates with the moving contact is provided on one side of the piston, a coil spring is provided on the push rod, a sleeve cooperates with the coil spring is provided at one end of the piston cylinder on the same side as the push rod, the sleeve is threadedly engaged with the piston cylinder, a rodless cavity is provided on the side of the piston cylinder facing away from the push rod, and an oil hole connected to the rodless cavity is provided on the piston cylinder.

[0007] Furthermore, a push block is installed on one end of the push rod away from the piston.

[0008] Furthermore, the piston cylinder includes a cylinder body and a cylinder head, and a sealing head that cooperates with the sliding seal of the rodless chamber is installed on the side of the piston facing away from the push rod. The outer diameter of the sealing head is smaller than the outer diameter of the piston, and a small diameter section that cooperates with the sealing head is provided in the cylinder body, and the oil hole is always located between the sealing head and the piston.

[0009] Furthermore, the auxiliary switch is connected to an end of the piston cylinder away from the piston through a bracket.

[0010] Furthermore, the cylinder cover is a transparent cover, the sleeve is installed in the cylinder cover, the cylinder cover and the sleeve are connected by threads, and the cylinder cover and the cylinder body are connected by threads.

[0011] Beneficial effects: The delay device of the present invention is an improved invention. The delay device of the present invention includes a piston cylinder and an auxiliary switch. A piston is provided in the piston cylinder. A push rod is provided on one side of the piston. The push rod corresponds to the moving contact of the auxiliary switch. When the hydraulic operating mechanism performs a closing operation, high-pressure oil enters the rodless cavity through the oil hole to push the push rod to move to the right. After moving a certain distance, the push rod pushes into the moving contact of the auxiliary switch to close the auxiliary switch, and provides a closing position signal to the control end of the hydraulic operating mechanism; when the hydraulic operating mechanism performs an opening operation, the rodless cavity in the piston cylinder is converted to low-pressure oil, and the push rod moves to the left under the action of the coil spring, and the moving and static contacts of the auxiliary switch are disconnected. When it is necessary to adjust the closing and opening time of the hydraulic operating mechanism, the movement time of the push rod can be changed by twisting the sleeve to change the elastic force of the coil spring on the piston. By twisting the sleeve, the movement time of the push rod can be adjusted faster and more accurately. The delay device of the present invention can adjust the closing and opening intervals of the hydraulic operating mechanism faster and more accurately, thereby improving the debugging efficiency.

[0012] The hydraulic operating mechanism of the present invention adopts the following technical solutions:

[0013] A hydraulic operating mechanism includes a delay device and a trip control circuit. The delay device includes a piston cylinder and an auxiliary switch connected in series to the corresponding trip control circuit. A piston is provided in the piston cylinder and cooperates with the piston cylinder for sliding sealing. The auxiliary switch includes a moving contact. A push rod is provided on one side of the piston and cooperates with the moving contact. A coil spring is provided on the push rod. A sleeve is provided on the end of the piston cylinder on the same side as the push rod and cooperates with the coil spring. The sleeve is threadedly engaged with the piston cylinder. A rodless cavity is provided on the side of the piston cylinder facing away from the push rod. An oil hole connected to the rodless cavity is provided on the piston cylinder.

[0014] Furthermore, a push block is installed on one end of the push rod away from the piston.

[0015] Furthermore, the piston cylinder includes a cylinder body and a cylinder head, and a sealing head that cooperates with the sliding seal of the rodless chamber is installed on the side of the piston facing away from the push rod. The outer diameter of the sealing head is smaller than the outer diameter of the piston, and a small diameter section that cooperates with the sealing head is provided in the cylinder body, and the oil hole is always located between the sealing head and the piston.

[0016] Furthermore, the auxiliary switch is connected to an end of the piston cylinder away from the piston through a bracket.

[0017] Furthermore, the cylinder cover is a transparent cover, the sleeve is installed in the cylinder cover, the cylinder cover and the sleeve are connected by threads, and the cylinder cover and the cylinder body are connected by threads.

[0018] Beneficial effects: The hydraulic operating mechanism of the present invention is an improved invention. The hydraulic operating mechanism of the present invention includes a delay device and a switch-off control circuit. The delay device includes a piston cylinder and an auxiliary switch. A piston is provided in the piston cylinder. A push rod is provided on one side of the piston. The push rod corresponds to the moving contact of the auxiliary switch. When the hydraulic operating mechanism performs a closing operation, high-pressure oil enters the rodless cavity through the oil hole to push the push rod to move to the right. After moving a certain distance, the push rod pushes into the moving contact of the auxiliary switch to close the auxiliary switch, and provides a closing position signal to the control end of the hydraulic operating mechanism; when the hydraulic operating mechanism performs a switch-off operation, the rodless cavity in the piston cylinder is converted to low-pressure oil, and the push rod moves to the left under the action of the coil spring, and the moving and static contacts of the auxiliary switch are disconnected. When it is necessary to adjust the closing and opening time of the hydraulic operating mechanism, the movement time of the push rod can be changed by twisting the sleeve to change the elastic force of the coil spring on the piston. By twisting the sleeve, the movement time of the push rod can be adjusted faster and more accurately. The hydraulic operating mechanism of the present invention can adjust the closing and opening interval faster and more accurately, thereby improving the debugging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the delay device of the present invention.

[0020] In the figure: 1. cylinder body; 2. auxiliary switch; 3. push rod; 4. push block; 5. piston; 6. coil spring; 7. cylinder cover; 8. sleeve; 9. moving contact; 10. bracket; 11. rodless chamber; 12. low-pressure chamber; 13. sealing head. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] The delay device of the present invention changes the elastic force of the coil spring on the piston by twisting the sleeve, thereby changing the movement time of the push rod and further changing the closing and opening interval of the hydraulic operating mechanism. The delay device of the present invention changes the elastic force of the coil spring on the piston by twisting the sleeve, and can adjust the closing and opening interval of the hydraulic operating mechanism faster and more accurately.

[0023] In a basic embodiment, Figure 1 As shown, an auxiliary switch 2 is provided at the right end of the cylinder body 1 of the delay device, a piston 5 is installed in the cylinder body 1, a push rod 3 is installed at the right end of the piston 5, the push rod 3 corresponds to the position of the moving contact 9 of the auxiliary switch 2, a coil spring 6 is provided on the push rod 3, a sleeve 8 is installed in the cylinder body 1, the sleeve 8 is connected to the cylinder body 1 by a thread, the sleeve 8 cooperates with the coil spring 6, the elastic force of the coil spring 6 on the piston 5 can be changed by adjusting the sleeve 8, and then the movement time of the push rod 3 is changed, so as to adjust the closing and opening interval of the hydraulic operating mechanism.

[0024] An oil hole Z leading to the control oil chamber of the hydraulic operating mechanism is provided on the cylinder body 1. The oil hole Z is located on the left side of the piston 5. A rodless chamber 11 connected to the oil hole Z is formed between the left side of the piston 5 and the cylinder body 1. When the hydraulic operating mechanism performs a closing operation, the control oil chamber of the hydraulic operating mechanism becomes a high-pressure state, and the high-pressure oil enters the rodless chamber 11 in the cylinder body 1 through the oil hole Z. The high-pressure oil in the rodless chamber 11 pushes the piston 5 and the push rod 3 to move to the right. After moving a certain distance, the push rod 3 contacts the moving contact 9 of the auxiliary switch 2. At this time, the push rod 3 pushes the moving contact 9 of the auxiliary switch 2 to close the auxiliary switch 2, thereby transmitting a closing position signal to the control end of the hydraulic operating mechanism. At this time, the hydraulic operating mechanism can perform an opening operation. When the hydraulic operating mechanism performs an opening operation, the control oil chamber of the hydraulic operating mechanism becomes a low-pressure state, and the rodless chamber 11 in the cylinder body 1 is converted to low-pressure oil. At this time, the piston 5 moves to the left under the action of the coil spring 6, and the auxiliary switch 2 is disconnected again until the left end of the piston 5 contacts the cylinder body 1. When the closing and opening interval of the hydraulic operating mechanism needs to be adjusted, the sleeve 8 can be twisted to change the elastic force of the coil spring 6 on the piston 5 and then change the movement time of the push rod 3, thereby adjusting the closing and opening interval of the hydraulic operating mechanism.

[0025] In a preferred embodiment, a push block 4 is installed at one end of the push rod 3 away from the piston 5, and the push block 4 pushes the moving contact 9 of the auxiliary switch 2 to close the auxiliary switch 2.

[0026] In other embodiments, no push block is installed at the end of the push rod 3 away from the piston 5, and the push rod 3 can directly push the moving contact 9 of the auxiliary switch 2 to close the auxiliary switch 2.

[0027] In a preferred embodiment, the piston cylinder includes a cylinder body and a cylinder head, a sealing head 13 that cooperates with the cylinder body 1 for sliding sealing is provided on the left side of the piston 5, a small diameter section that cooperates with the sealing head 13 is provided in the cylinder body 1, a low-pressure chamber 12 is formed between the sealing head 13 and the cylinder body 1, the outer diameter of the sealing head 13 is smaller than the outer diameter of the piston 5, ensuring that the piston 5 can move to the right under the action of oil pressure, the rodless chamber 11 is located between the sealing head 13 and the piston 5, and an oil hole T leading to the low-pressure oil chamber of the hydraulic operating mechanism is provided on the cylinder body 1, the oil hole T is located at the left end of the piston 5, and the low-pressure chamber 12 is always filled with low-pressure oil. By setting the low-pressure oil chamber, the air on the left side of the piston 5 in the cylinder body 1 can be discharged, so that the push rod 3 can move a longer distance in the cylinder body 1.

[0028] In other embodiments, the oil hole T can be changed into an exhaust hole leading to the atmosphere, which can reduce the sealing between the oil circuit and the T hole and exhaust the air on the left side of the piston 5, so that the push rod 3 can move a longer distance in the cylinder body 1; in other embodiments, the oil hole T at the left end of the cylinder body 1 can be eliminated, and the left end of the cylinder body 1 can be changed into a blind hole that cooperates with the piston 5. There is no need to seal the left end of the push rod 3, the structure is simpler, and there are fewer sealing links, but air will remain in the cylinder body on the left side of the piston 5, which does not affect the use of the delay device.

[0029] In a preferred embodiment, the auxiliary switch 2 is connected to the right end of the cylinder body 1 through the bracket 10, and then connected in series to the corresponding opening control circuit.

[0030] In other embodiments, the auxiliary switch 2 can be arranged on a support independent of the cylinder body 1 and then connected in series to the corresponding opening control circuit.

[0031] In a preferred embodiment, the cylinder cover 7 is a transparent cover, the sleeve 8 is installed in the cylinder cover 7, the sleeve 8 and the cylinder cover 7 are connected by threads, and the cylinder cover 7 and the cylinder body 1 are connected by threads. When the cylinder cover 7 stops the piston 5, there is still a gap between the piston 5 and the sleeve 8, and the coil spring 6 is not completely deformed, which can extend the service life of the coil spring 6.

[0032] In other embodiments, the sleeve 8 is directly connected to the cylinder body 1, and the push rod 3 will stop moving when it pushes the moving contact 9 to close the auxiliary switch 2. At this time, the coil spring 6 may not be completely deformed and the function of the coil spring 6 is not affected.

[0033] The specific implementation of the delay device of the present invention is as follows: when the hydraulic operating mechanism performs a closing operation, the control oil chamber of the hydraulic operating mechanism becomes a high-pressure state, and the high-pressure oil enters the rodless chamber 11 in the cylinder body 1 through the oil hole Z. The high-pressure oil in the rodless chamber 11 pushes the piston 5 and the push rod 3 to move to the right. After moving a certain distance, the push rod 3 contacts the moving contact 9 of the auxiliary switch 2. At this time, the push rod 3 pushes the moving contact 9 of the auxiliary switch 2 to close the auxiliary switch 2, thereby transmitting a closing position signal to the control end of the hydraulic operating mechanism. At this time, the hydraulic operating mechanism can perform an opening operation. When the hydraulic operating mechanism performs an opening operation, the control oil chamber of the hydraulic operating mechanism becomes a low-pressure state, and the rodless chamber 11 in the cylinder body 1 is converted to low-pressure oil. At this time, the piston 5 moves to the left under the action of the coil spring 6, and the auxiliary switch 2 is disconnected again until the left end of the piston 5 contacts the cylinder body 1. When the closing and opening interval of the hydraulic operating mechanism needs to be adjusted, the sleeve 8 can be twisted to change the elastic force of the coil spring 6 on the piston 5 and then change the movement time of the push rod 3, thereby adjusting the closing and opening interval of the hydraulic operating mechanism.

[0034] The specific implementation of the hydraulic operating mechanism of the present invention is as follows:

[0035] The hydraulic operating mechanism includes the above-mentioned delay device and the opening control circuit. The auxiliary switch of the delay device is connected in series in the opening control circuit. The specific implementation of the delay device is as described above and will not be repeated here.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A time delay device, comprising a piston cylinder and an auxiliary switch connected in series to a corresponding opening control circuit, wherein a piston is provided in the piston cylinder and cooperates with the piston cylinder in a sliding seal, the auxiliary switch comprises a moving contact, and a push rod cooperating with the moving contact is provided on one side of the piston, characterized in that: A coil spring is provided on the push rod, and a sleeve matching with the coil spring is provided at one end of the piston cylinder on the same side as the push rod. The sleeve and the piston cylinder are threadedly matched, and a rodless cavity is provided on the side of the piston cylinder facing away from the push rod, and an oil hole connected with the rodless cavity is provided on the piston cylinder.

2. The delay device according to claim 1, characterized in that: A push block is installed on one end of the push rod away from the piston.

3. The delay device according to claim 1, characterized in that: The piston cylinder includes a cylinder body and a cylinder cover. A sealing head that cooperates with the sliding seal of the rodless chamber is installed on the side of the piston that is away from the push rod. The outer diameter of the sealing head is smaller than the outer diameter of the piston. A small diameter section that cooperates with the sealing head is provided in the cylinder body, and the oil hole is always located between the sealing head and the piston.

4. The delay device according to any one of claims 1 to 3, characterized in that: The auxiliary switch is connected to an end of the piston cylinder away from the piston through a bracket.

5. The delay device according to claim 3, characterized in that: The cylinder cover is a transparent cover, the sleeve is installed in the cylinder cover, the cylinder cover and the sleeve are connected by threads, and the cylinder cover and the cylinder body are connected by threads.

6. A hydraulic operating mechanism, comprising a time delay device and a switch-off control circuit, wherein the time delay device comprises a piston cylinder and an auxiliary switch connected in series to the corresponding switch-off control circuit, wherein a piston is provided in the piston cylinder and cooperates with the piston cylinder in a sliding seal, wherein the auxiliary switch comprises a moving contact, and a push rod cooperating with the moving contact is provided on one side of the piston, wherein: A coil spring is provided on the push rod, and a sleeve matching with the coil spring is provided at one end of the piston cylinder on the same side as the push rod. The sleeve and the piston cylinder are threadedly matched, and a rodless cavity is provided on the side of the piston cylinder facing away from the push rod, and an oil hole connected with the rodless cavity is provided on the piston cylinder.

7. The hydraulic operating mechanism according to claim 6, characterized in that: A push block is installed on one end of the push rod away from the piston.

8. The hydraulic operating mechanism according to claim 6, characterized in that: The piston cylinder includes a cylinder body and a cylinder cover. A sealing head that cooperates with the sliding seal of the rodless chamber is installed on the side of the piston that is away from the push rod. The outer diameter of the sealing head is smaller than the outer diameter of the piston. A small diameter section that cooperates with the sealing head is provided in the cylinder body, and the oil hole is always located between the sealing head and the piston.

9. The hydraulic operating mechanism according to any one of claims 6 to 8, characterized in that: The auxiliary switch is connected to an end of the piston cylinder away from the piston through a bracket.

10. The hydraulic operating mechanism according to claim 8, characterized in that: The cylinder cover is a transparent cover, the sleeve is installed in the cylinder cover, the cylinder cover and the sleeve are connected by threads, and the cylinder cover and the cylinder body are connected by threads.

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