Star-triangle mechanical starting device

Abstract

The utility model discloses a star-triangle mechanical starting device which comprises a handle and a rotating shaft, a fixing support is arranged on the inner side of an electrical cabinet panel, the handle is inserted into the fixing support, one end of the rotating shaft is inserted into a central hole of the handle and rotates along with the handle, and the other end of the rotating shaft is installed on an electrical cabinet bottom plate. A connecting rod is arranged on the rotating shaft, a sleeve is fixed on the connecting rod, an ejector rod and a spring are arranged in the sleeve, the ejector rod is sleeved with the spring, an arc-shaped contact is arranged at the tail end of the ejector rod, the arc-shaped contact is located above the lower cover plate, a hole is formed in the lower cover plate, and an alternating current contactor is arranged below the hole. The fire pump emergency starting device has the advantages of being reasonable and simple in structure, low in cost, convenient to use and capable of guaranteeing personal safety and reliable work of equipment when a secondary control circuit of a water pump control cabinet is damaged or fails in a fire disaster.

Description

Technical Field

[0001] The utility model relates to a starting device for a fire control cabinet, in particular to a star-delta mechanical starting device. Background Art

[0002] Most of the existing fire control cabinets use electric starting circuit to open the control contactor contact, but due to environmental factors and the possibility of burning or damage of electrical components in the starting circuit in the event of a fire, the fire pump cannot be started in time, affecting the fire extinguishing. Although there are various types of forced starting devices in traditional technology, most of them are bypass starting structures, but they are not designed reasonably enough, which reduces the safety of operators and even causes personal injury and life-threatening. Summary of the invention

[0003] In view of the problems existing in the prior art, the utility model provides a device for emergency starting of a fire pump when the secondary control circuit of a water pump control cabinet is damaged or fails during a fire. The utility model has a reasonable structure, is simple, low cost, is easy to use, and ensures the reliable operation of personal safety and equipment. It is a star-delta mechanical starting device.

[0004] The purpose of the utility model is achieved through the following technical solutions.

[0005] A star-delta mechanical starting device comprises a handle and a rotating shaft. A fixed bracket is provided on the inner side of an electrical cabinet panel, the handle is inserted into the fixed bracket, one end of the rotating shaft is inserted into the central hole of the handle and rotates with the handle, the other end of the rotating shaft is mounted on the bottom plate of the electrical cabinet, a connecting rod is provided on the rotating shaft, a sleeve is fixed on the connecting rod, a push rod and a spring are installed in the sleeve, the spring is sleeved on the push rod, an arc-shaped contact is provided at the end of the push rod, the arc-shaped contact is located above a lower cover plate, the lower cover plate is provided with a hole, and an AC contactor is provided below the hole.

[0006] An adjusting nut is provided at one end of the spring, and the adjusting nut is used to adjust the spring pressure.

[0007] The contacts of the AC contactor are provided with contact supporting members.

[0008] The handle is provided with 3 gears during its rotation process.

[0009] The edge of the hole is provided with a slope.

[0010] The angle between the slope and the plane of the lower cover plate is less than or equal to 30°.

[0011] Compared with the prior art, the advantages of the utility model are: when the primary circuit works normally and the secondary circuit cannot work, the device can be used to perform star-delta starting of the motor. It has a reasonable and simple structure, low cost, easy use, and ensures personal safety and reliable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model.

[0013] Figure 2 This is a schematic diagram of the rotation gear positions of the handle of the utility model.

[0014] In the figure: 1, handle 2, rotating shaft 3, connecting rod 4, adjusting nut 5, sleeve 6, spring 7, push rod 8, lower cover 9, middle cover 10, upper cover 11, shell a, panel b, bottom plate m, contact support e, AC contactor. Implementation

[0015] The utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] A star-delta mechanical starting device comprises a handle and a rotating shaft. A fixed bracket is provided on the inner side of an electrical cabinet panel, the handle is inserted into the fixed bracket, one end of the rotating shaft is inserted into the central hole of the handle and rotates with the handle, the other end of the rotating shaft is mounted on the bottom plate of the electrical cabinet, a connecting rod is provided on the rotating shaft, a sleeve is fixed on the connecting rod, a push rod and a spring are installed in the sleeve, the spring is sleeved on the push rod, an arc-shaped contact is provided at the end of the push rod, the arc-shaped contact is located above a lower cover plate, the lower cover plate is provided with a hole, and an AC contactor is provided below the hole.

[0017] The rotating shaft is inserted into the central square hole of the handle and the device is installed on the bottom plate of the electrical cabinet. The device is divided into 4 layers. The lower cover 8 supports the weight and movement trajectory of the entire device, the middle cover 9 bears the weight of the rotating parts, and the upper cover 10 is connected to the middle and lower covers to make the structure firm and easy to install. The shell 11 makes the mechanism complete. The lower cover is installed on the AC contactor, the sleeve is installed on the middle cover, and a push rod and a spring are installed inside. The adjustment nut is used to adjust the spring pressure so that the push rod presses on the contact support of the AC contactor with appropriate pressure to achieve the purpose of connecting the upper and lower terminals of the AC contactor. The connecting rod is installed on the sleeve and the rotating shaft. The rotating shaft receives torque, rotates the sleeve, and the handle stops at different positions of "Y", "O", and "Δ", realizing the star-delta method to start the motor and run it.

[0018] The edge of the hole is provided with a slope, and the angle between the slope and the plane of the lower cover plate is less than or equal to 30 degrees, so as to facilitate the arc-shaped contact to enter and exit the hole.

[0019] The specific steps are as follows:

[0020] The handle is normally in the "O" position. The first step of starting the motor using the star-delta method is to turn the handle to "Y", that is, the handle drives the connecting rod to rotate to the j position through the rotating shaft, the spring 6 is released, and the push rod 7 presses down the contact support m of the AC contactor e. The upper and lower terminals of the AC contactor e are in the conducting state. At this time, the motor runs under the star connection method;

[0021] After 10-15 seconds, the handle rotates counterclockwise (right), the contact support of the star-shaped AC contactor e returns to normal, the upper and lower terminals are disconnected, and it rotates about 60 degrees to reach "Δ", that is: at this time, the handle drives the connecting rod to rotate to the k position through the rotating shaft, and the top rod presses down the contact support of the AC contactor under the action of the spring, and the upper and lower terminals of the "Δ" connection AC contactor are connected to form a passage, completing the motor "Δ" connection, starting the normal operation of the motor, and realizing the motor "Y"-"Δ" connection conversion;

[0022] After completing all the running tasks, turn the handle 30 degrees clockwise to the "O" point. At this time, the contact support of the AC contactor E returns to the normal state, the upper and lower terminals of the AC contactor are not conducting, the motor is in a power-off state, and the motor stops running. Wait for the next operation.

[0023] When the connecting rod rotates to e and f at m and n of the AC contactor, and the pressure required for the upper and lower terminals to contact is not proportional, you can use the adjusting nut 4 to adjust the contact head pressure of the AC contactor by turning it right (left) to achieve the correct pressure required by the AC contactor contacts.

Claims

1. A star-delta mechanical starting device, characterized in that It includes a handle and a rotating shaft. A fixed bracket is provided on the inner side of the electrical cabinet panel. The handle is inserted into the fixed bracket. One end of the rotating shaft is inserted into the central hole of the handle and rotates with the handle. The other end of the rotating shaft is installed on the bottom plate of the electrical cabinet. A connecting rod is provided on the rotating shaft. A sleeve is fixed on the connecting rod. A push rod and a spring are installed in the sleeve. The spring is sleeved on the push rod. An arc-shaped contact is provided at the end of the push rod. The arc-shaped contact is located above the lower cover plate. The lower cover plate is provided with a hole. An AC contactor is provided below the hole.

2. A star-delta mechanical starting device according to claim 1, characterized in that An adjusting nut is provided at one end of the spring, and the adjusting nut is used to adjust the spring pressure.

3. A star-delta mechanical starting device according to claim 1, characterized in that The contacts of the AC contactor are provided with contact supporting members.

4. A star-delta mechanical starting device according to any one of claims 1 to 3, characterized in that The handle is provided with 3 gears during its rotation process.

5. A star-delta mechanical starting device according to any one of claims 1 to 3, characterized in that The edge of the hole is provided with a slope.

6. A star-delta mechanical starting device according to claim 5, characterized in that The angle between the slope and the plane of the lower cover plate is less than or equal to 30°.

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