CN204375590U - A kind of time-delay mechanism and use hydraulic actuating mechanism and the circuit breaker of this time-delay mechanism - Google Patents

Abstract

The utility model relates to a time-delay mechanism and a hydraulic operating mechanism and a circuit breaker using the time-delay mechanism. The time-delay mechanism includes an auxiliary hydraulic cylinder and an auxiliary switch for being arranged in series in a corresponding opening control circuit. The auxiliary hydraulic cylinder has an axis The piston rod extending in the left and right directions, the auxiliary switch has a moving knife and a static knife placed on the right side of the piston rod, the moving knife is connected with a transmission rod that can move linearly in the left and right directions, and the left end of the transmission rod has a The right end of the piston rod pushes and cooperates to drive the force-bearing part of the moving knife and the static knife closing when the transmission rod moves to the right. The utility model solves the problems in the prior art that the crank connecting rod mechanism causes a complex structure of the time delay mechanism and generates lateral force on the piston rod of the auxiliary hydraulic cylinder.

Description

A time-delay mechanism, a hydraulic operating mechanism and a circuit breaker using the time-delay mechanism

technical field

The utility model relates to a delay mechanism, a hydraulic operating mechanism and a circuit breaker using the delay mechanism.

Background technique

When the circuit breaker performs on-off operation, it is necessary to control the on-off interval of the circuit breaker so that the contacts of the circuit breaker are closed to the end, and the gas pressure and volume in the cylinder of the arc extinguishing chamber return to the normal state before restarting. Perform opening operation to ensure the breaking performance of the circuit breaker. Since the action time of the relay protection of the power system is relatively short, and no artificial delay is allowed, the opening and closing time of the circuit breaker needs to be guaranteed by the structure of the operating mechanism itself, so a delay is required in the operating mechanism of the circuit breaker mechanism.

The existing hydraulic operating mechanism includes an opening and closing hydraulic cylinder and a time-delay mechanism. The time-delay mechanism includes an auxiliary switch and an auxiliary hydraulic cylinder with a time-delay action. The knife is connected, and the auxiliary switch is set in series in the opening control circuit of the hydraulic operating mechanism. When in use, the piston rod of the opening and closing hydraulic cylinder stretches out to drive the dynamic and static contacts of the circuit breaker to close. After the opening and closing hydraulic cylinder closes and delays for a certain period of time, the auxiliary hydraulic cylinder will drive the auxiliary switch to close. At this time, the opening control circuit is turned on, and the circuit breaker can perform the opening operation. The delay mechanism ensures the time interval between the closing action and the opening action, and realizes the self-defense capability of the circuit breaker. The problem with this existing delay mechanism is that the piston rod of the auxiliary hydraulic cylinder is connected with the moving knife of the auxiliary switch through the crank linkage mechanism. The setting of the crank linkage mechanism increases the structural complexity of the delay mechanism, and also Occupies a large space, which is not conducive to the miniaturization of the delay mechanism. At the same time, the crank-link mechanism exerts a lateral force on the piston rod of the auxiliary hydraulic cylinder. This lateral force makes the movement of the piston rod of the auxiliary hydraulic cylinder inflexible and prone to The problem of delayed failure. In addition, after the piston rod is subject to lateral force, the movement of the piston rod is prone to deflection, which will cause the piston rod to easily wear the sealing ring, and the auxiliary hydraulic cylinder is prone to oil leakage.

Utility model content

The purpose of this utility model is to provide a time-delay mechanism to solve the problem that the crank-link mechanism in the prior art causes a complex structure of the time-delay mechanism and will generate lateral force on the piston rod of the auxiliary hydraulic cylinder; the purpose of the utility model It also aims to provide a hydraulic operating mechanism and a circuit breaker using the delay mechanism.

In order to solve the above problems, the technical scheme of the delay mechanism in the utility model is:

The time delay mechanism includes an auxiliary hydraulic cylinder and an auxiliary switch used in series in the corresponding opening control circuit. The auxiliary hydraulic cylinder has a piston rod whose axis extends in the left and right directions. The auxiliary switch has a moving knife and a static knife, and the moving knife is connected to There is a transmission rod placed on the right side of the piston rod that can move in a straight line in the left and right direction. The left end of the transmission rod is used to push and cooperate with the right end of the piston rod to drive the moving knife and the static knife when the transmission rod moves to the right. Closing part of the force.

The auxiliary switch is arranged on the right end of the auxiliary hydraulic cylinder through a bracket.

The auxiliary switch is a micro switch.

The technical scheme of the hydraulic operating mechanism in the utility model is:

The hydraulic operating mechanism includes a delay mechanism and an opening control circuit. The delay mechanism includes an auxiliary hydraulic cylinder and an auxiliary switch arranged in series in the opening control circuit. The auxiliary hydraulic cylinder has a piston rod whose axis extends in the left and right directions. The auxiliary switch has a moving knife and a static knife. The moving knife is connected with a transmission rod placed on the right side of the piston rod that can move in a straight line in the left and right direction. The left end of the transmission rod is used to push and cooperate with the right end of the piston rod When the transmission rod moves to the right, it drives the force receiving part of the moving knife and the static knife to close.

The auxiliary switch is arranged on the right end of the auxiliary hydraulic cylinder through a bracket.

The auxiliary switch is a micro switch.

The hydraulic operating mechanism also includes a hydraulic oil circuit and an opening and closing hydraulic cylinder. The hydraulic oil circuit includes an oil tank and an oil pump connected to the oil tank. The road is connected with the oil outlet of the oil pump, and the rodless cavity of the auxiliary hydraulic cylinder and the opening and closing hydraulic cylinder is connected through the second oil road connected in parallel, and a throttle valve is arranged in series on the second oil road connected with the auxiliary hydraulic cylinder. , The opening control circuit includes a two-position three-way reversing valve arranged between the second oil circuit, the first oil circuit and the oil tank.

The technical scheme of the circuit breaker of the utility model is:

The circuit breaker includes a hydraulic operating mechanism, the hydraulic operating mechanism includes a time delay mechanism and an opening control circuit, the time delay mechanism includes an auxiliary hydraulic cylinder and an auxiliary switch in the opening control circuit in series, the auxiliary hydraulic cylinder has an axis along The piston rod extending in the left and right directions, the auxiliary switch has a moving knife and a static knife, the moving knife is connected with a transmission rod that can move in a straight line in the left and right direction and is placed on the right side of the piston rod, and the left end of the transmission rod has a The right end of the piston rod pushes and fits to drive the force receiving part of the moving knife and the static knife closing when the transmission rod moves to the right.

The auxiliary switch is a micro switch.

The hydraulic operating mechanism also includes a hydraulic oil circuit and an opening and closing hydraulic cylinder. The hydraulic oil circuit includes an oil tank and an oil pump connected to the oil tank. The road is connected with the oil outlet of the oil pump, and the rodless cavity of the auxiliary hydraulic cylinder and the opening and closing hydraulic cylinder is connected through the second oil road connected in parallel, and a throttle valve is arranged in series on the second oil road connected with the auxiliary hydraulic cylinder. , The opening control circuit includes a two-position three-way reversing valve arranged between the second oil circuit, the first oil circuit and the oil tank.

The beneficial effects of the utility model are as follows: the movable knife of the auxiliary switch in the utility model is connected with a transmission rod that can move linearly in the left and right directions, and after the piston rod of the auxiliary hydraulic cylinder is stretched out, the piston rod of the auxiliary hydraulic cylinder can be pushed As the transmission rod moves to the right and the moving knife and static knife of the auxiliary switch are closed, since the movement direction of the transmission rod is consistent with the movement direction of the piston rod of the auxiliary switch, the crank connecting rod mechanism and the piston of the auxiliary switch can be omitted. The rod can directly push the transmission rod to drive the moving knife, which simplifies the structure of the delay mechanism. In addition, the transmission rod will not generate lateral force on the piston rod of the auxiliary switch, ensuring the service life of the auxiliary hydraulic cylinder.

Description of drawings

Fig. 1 is the structural representation of an embodiment of hydraulic operating mechanism in the utility model;

Fig. 2 is a schematic structural diagram of the delay mechanism in Fig. 1 .

Detailed ways

The implementation of the circuit breaker is shown in Figures 1 and 2: it includes the moving contact 1, the static contact and the hydraulic operating mechanism. The hydraulic operating mechanism includes the opening control circuit, the delay mechanism 8, the opening and closing hydraulic cylinder 2 and the hydraulic pressure. The oil circuit, the opening and closing hydraulic cylinder 2 is connected to the moving contact. The delay mechanism includes an auxiliary hydraulic cylinder 9 and an auxiliary switch 10 arranged in series in the opening control circuit. In this embodiment, the auxiliary switch is a micro switch. The auxiliary switch 10 is arranged on the auxiliary hydraulic cylinder through the bracket 13. The auxiliary hydraulic cylinder has a piston rod 16 whose axis extends along the left and right directions. The auxiliary switch is a micro switch. The transmission rod 14, the micro switch belongs to the prior art, and its specific structure is no longer described in detail. The dynamic and static knives are placed on the right side of the piston rod of the auxiliary hydraulic cylinder, the transmission rod 14 is connected with the moving knife, and the transmission rod 14 is connected with the auxiliary hydraulic cylinder. The piston rod of the hydraulic cylinder is coaxially arranged, and the left end of the transmission rod 14 has a force receiving part for pushing and cooperating with the right end of the piston rod 16 to drive the moving knife and the static knife to close when the transmission rod moves to the right. When the piston rod 16 of the auxiliary hydraulic cylinder is stretched out, the piston rod of the auxiliary hydraulic cylinder pushes the force-bearing part of the transmission rod 14 to move the transmission rod to the right, and the transmission rod can drive the moving knife and the static knife to close the brake, so that the opening The control circuit is turned on. The hydraulic oil circuit includes a fuel tank 5 and an oil pump 4 connected to the fuel tank 5. The rod cavity of the auxiliary hydraulic cylinder 9 and the opening and closing hydraulic cylinder 2 is connected with the oil outlet of the oil pump 4 through the first oil circuit 11 arranged in parallel. The rodless cavity of the hydraulic cylinder and the opening and closing hydraulic cylinder are connected through the second oil circuit 12 arranged in parallel, and the throttle valve 7 is arranged in series on the second oil circuit connected with the auxiliary hydraulic cylinder. The two-position three-way reversing valve 6 between the road, the first oil circuit and the oil tank. The throttle valve is arranged on the cylinder body 17 of the auxiliary hydraulic cylinder. The cylinder body of the auxiliary hydraulic cylinder is provided with a piston hole penetrating the cylinder body along the left and right direction. The valve body 18 of the throttle valve is installed at the left end of the piston hole. The auxiliary hydraulic cylinder The piston rod 16 is guided and moved to the right end of the piston hole. The valve body of the throttle valve is provided with an axial hole 20 extending in the left and right direction and a radial hole 21 extending in the radial direction of the cylinder body of the auxiliary hydraulic cylinder. The hole is connected with the axial hole, and the left end of the axial hole is screwed with an adjusting screw 19. The flow rate of the axial hole and the radial hole can be adjusted by moving the adjusting screw left and right. The rodless chamber of the auxiliary hydraulic cylinder is controlled by the auxiliary hydraulic cylinder. The piston rod and the valve body of the throttle valve are enclosed. The right end of the piston hole is provided with a guide sleeve for guiding the piston rod to pass through, and a sealing ring is provided between the guide sleeve and the piston rod.

The oil pump sucks low-pressure oil from the oil tank and outputs high-pressure oil, and the output high-pressure oil enters the accumulator 3 for storage. When the hydraulic operating mechanism receives the closing command, the two-position three-way valve switches to the closing position, and the opening and closing hydraulic pressure Both the rodless cavity of the hydraulic cylinder and the auxiliary hydraulic cylinder are connected to the high-pressure system through a two-position three-way valve. , due to the function of the throttle valve, the action of the auxiliary hydraulic cylinder will be slower than that of the opening and closing hydraulic cylinder. The dynamic and static contacts first complete the closing action. The piston rod drives the moving knife and static knife of the auxiliary switch to close. At this time, the opening control circuit is turned on. At this time, the hydraulic operating mechanism can perform the opening operation. This ensures the closing and opening time of the circuit breaker. By adjusting the screw The axial movement of the auxiliary hydraulic cylinder can control the speed of the auxiliary hydraulic cylinder to meet the requirements of the circuit breaker for the opening and closing time. When the circuit breaker needs to be opened, the opening control circuit controls the reversing of the two-position three-way reversing valve, and the second oil circuit communicates with the oil tank through the two-position three-way reversing valve, thereby realizing the opening and closing hydraulic cylinder and the auxiliary hydraulic cylinder The piston rod retracts. The delay mechanism in the utility model can be used in various types of hydraulic operating mechanisms to control the closing of the circuit breaker and delay the opening action for a certain period of time to ensure the breaking performance of the circuit breaker.

The movement direction of the transmission rod of the auxiliary switch is consistent with the movement direction of the piston rod of the auxiliary hydraulic cylinder, so there is no need to set a transmission structure between the piston rod and the transmission rod to ensure reliable transmission between the piston rod and the transmission rod, which simplifies The structure of the delay mechanism also reduces the occupied space of the delay mechanism; the transmission rod will not produce lateral force on the piston rod, which ensures the stability of the movement of the piston rod, and the piston rod will not produce any force on the sealing ring on the guide sleeve. Excessive wear and tear, the auxiliary hydraulic cylinder is not easy to leak oil, which ensures the service life of the auxiliary hydraulic cylinder. In other embodiments of the circuit breaker: the auxiliary switch may not be arranged on the auxiliary hydraulic cylinder through the bracket, for example, the auxiliary switch may be arranged on a support independent of the auxiliary hydraulic cylinder; the auxiliary switch may not be micro-motion The switch, for example, the auxiliary switch is an ordinary switch with a linearly movable transmission rod; the axis of the transmission rod and the axis of the piston rod of the auxiliary switch can also be arranged in parallel.

The embodiment of the hydraulic operating mechanism is shown in Figures 1-2: the specific structure of the hydraulic operating mechanism is the same as the hydraulic operating mechanism described in the embodiments of the above circuit breakers, and will not be described in detail here.

The implementation of the time-delay mechanism is shown in Figures 1-2: the specific structure of the time-delay mechanism is the same as the time-delay mechanism described in the embodiments of the circuit breakers above, and will not be described in detail here.

Claims (10)

1. time-delay mechanism, comprise auxiliary hydraulic cylinder and for going here and there the auxiliary switch be located in corresponding separating brake control loop, auxiliary hydraulic cylinder has the piston rod that axis extends in left-right direction, auxiliary switch has moving knife and quiet cutter, it is characterized in that: moving knife is connected with can the drive link be placed on the right side of described piston rod of rectilinear motion in left-right direction, the left end of drive link have for coordinate with described piston rod right-hand member pushing tow with at drive link towards the forced section driving moving knife when moving right, quiet cutter closes a floodgate.

2. time-delay mechanism according to claim 1, is characterized in that: described auxiliary switch is by the right-hand member of Bracket setting in described auxiliary hydraulic cylinder.

3. time-delay mechanism according to claim 1 and 2, is characterized in that: described auxiliary switch is a sensitive switch.

4. hydraulic actuating mechanism, comprise time-delay mechanism and separating brake control loop, time-delay mechanism comprises auxiliary hydraulic cylinder and goes here and there the auxiliary switch be located in described separating brake control loop, auxiliary hydraulic cylinder has the piston rod that axis extends in left-right direction, auxiliary switch has moving knife and quiet cutter, it is characterized in that: moving knife is connected with can the drive link be placed on the right side of described piston rod of rectilinear motion in left-right direction, the left end of drive link have for coordinate with described piston rod right-hand member pushing tow with at drive link towards the forced section driving moving knife when moving right, quiet cutter closes a floodgate.

5. hydraulic actuating mechanism according to claim 4, is characterized in that: described auxiliary switch is by the right-hand member of Bracket setting in described auxiliary hydraulic cylinder.

6. hydraulic actuating mechanism according to claim 4, is characterized in that: described auxiliary switch is a sensitive switch.

7. the hydraulic actuating mechanism according to claim 4 ~ 6 any one, it is characterized in that: hydraulic actuating mechanism also comprises hydraulic circuit and divide-shut brake hydraulic cylinder, the oil pump that hydraulic circuit comprises fuel tank and is connected with described fuel tank, auxiliary hydraulic cylinder is connected with the oil-out of oil pump by the first oil circuit be arranged in parallel with the rod chamber of divide-shut brake hydraulic cylinder, auxiliary hydraulic cylinder, the rodless cavity of divide-shut brake hydraulic cylinder is connected by the second oil circuit be arranged in parallel, described second oil circuit be connected with auxiliary hydraulic cylinder is gone here and there and is provided with choke valve, separating brake control loop comprises and is arranged at the second oil circuit, two-bit triplet reversal valve between first oil circuit and fuel tank.

8. circuit breaker, comprise hydraulic actuating mechanism, hydraulic actuating mechanism comprises time-delay mechanism and separating brake control loop, time-delay mechanism comprises auxiliary hydraulic cylinder and goes here and there the auxiliary switch established in described separating brake control loop, auxiliary hydraulic cylinder has the piston rod that axis extends in left-right direction, auxiliary switch has moving knife and quiet cutter, it is characterized in that: moving knife is connected with can the drive link of rectilinear motion in left-right direction, the left end of drive link have for coordinate with described piston rod right-hand member pushing tow with at drive link towards the forced section driving moving knife when moving right, quiet cutter closes a floodgate.

9. circuit breaker according to claim 8, is characterized in that: described auxiliary switch is a sensitive switch.

10. circuit breaker according to claim 8 or claim 9, it is characterized in that: hydraulic actuating mechanism also comprises hydraulic circuit and divide-shut brake hydraulic cylinder, the oil pump that hydraulic circuit comprises fuel tank and is connected with described fuel tank, auxiliary hydraulic cylinder is connected with the oil-out of oil pump by the first oil circuit be arranged in parallel with the rod chamber of divide-shut brake hydraulic cylinder, auxiliary hydraulic cylinder, the rodless cavity of divide-shut brake hydraulic cylinder is connected by the second oil circuit be arranged in parallel, described second oil circuit be connected with auxiliary hydraulic cylinder is gone here and there and is provided with choke valve, separating brake control loop comprises and is arranged at the second oil circuit, two-bit triplet reversal valve between first oil circuit and fuel tank.