High-safety circulating water pump motor double-speed switching device

Abstract

The utility model relates to a high-safety circulating water pump motor double-speed switching device which comprises a power switch, a high-voltage cable, a circulating water pump high-low speed switching knife switch box, a high-speed knife switch, a low-speed knife switch, a high-speed lead, a low-speed lead and a motor. Wherein the power switch is connected with one end of the circulating water pump high-low speed switching knife switch box through a high-voltage cable; a high-speed knife switch and a low-speed knife switch are arranged in the circulating water pump high-low speed switching knife switch box; the high-speed knife switch is connected with the motor through a high-speed lead, and the low-speed knife switch is connected with the motor through a low-speed A high-speed switch blade and a low-speed switch blade are mechanically locked and cannot be simultaneously closed in place. The beneficial effects of the utility model are that through the knife switch mechanical structure and the electromagnetic lock in the high and low speed switching knife switch box of the circulating water pump, high and low speed switching and electrical five-prevention functions of the circulating water pump are realized; only one path of high-voltage power supply is needed on site, thereby greatly saving the reconstruction cost.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump motors, and more specifically, to a high-safety dual-speed switching device for circulating water pump motors. Background Art

[0002] At present, the high-speed and low-speed switching of the circulating water pump motor in the power plant is mostly achieved by connecting the high-speed switch to the high-speed lead of the motor and the low-speed switch to the low-speed lead of the motor. The high-speed and low-speed switching is achieved by opening and closing the switch. Conventionally, since the high-speed lead and the low-speed lead of the motor carry high voltage during operation, the original five-protection design of the switch cannot fully meet the safety needs. It is also necessary to fully consider the mechanical or electrical safety interlock between the high-speed and low-speed switches to ensure the five-protection failure problem that may exist during operation. However, once the interlock is too complicated, it is easy to cause an increase in circuit abnormalities, which will affect the reliable backup of the motor. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a high-safety dual-speed switching device for a circulating water pump motor. The technical solution is as follows:

[0004] Including power switch, high-voltage cable, circulating water pump high-low speed switching knife box, high-speed knife QS1, low-speed knife QS2, high-speed lead wire, low-speed lead wire and motor;

[0005] Among them, the power switch is connected to one end of the high-speed and low-speed switching knife box of the circulating water pump through the high-voltage cable; the high-speed knife QS1 and the low-speed knife QS2 are arranged in the high-speed and low-speed switching knife box of the circulating water pump; the high-speed knife QS1 is connected to the motor through the high-speed lead, and the low-speed knife QS2 is connected to the motor through the low-speed lead; the high-speed knife QS1 and the low-speed knife QS2 are mechanically locked and cannot be closed at the same time.

[0006] Preferably, the high-speed knife switch QS1 and the low-speed knife switch QS2 have electrical interlocking.

[0007] Preferably, the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2 are further included; the operation permission and prohibition of the high-speed knife switch QS1 and the low-speed knife switch QS2 are achieved by energizing and de-energizing the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2.

[0008] Preferably, a third electromagnetic lock DQ3 is also included; the third electromagnetic lock DQ3 is used to control the opening and closing of the cabinet door of the high-speed and low-speed switching knife box 3 of the circulating water pump.

[0009] Preferably, the rated current of the high-speed and low-speed switching switch box of the circulating water pump is 1000A.

[0010] Preferably, the circulating water pump high and low speed switching switch box is connected to a distributed control system.

[0011] The beneficial effects of the utility model are:

[0012] 1. The utility model realizes the high-speed and low-speed switching and the five electrical protection functions of the circulating water pump through the knife mechanical structure and the electromagnetic lock in the high-speed and low-speed switching knife box of the circulating water pump. Compared with the double-sided switch cabinet to realize the high and low speed of the circulating water pump, only one high-voltage power supply is required to the local area, and the short-distance cable to the motor junction box is used to realize the high-speed and low-speed cascading of the motor, which saves the use of one high-voltage switch and a large number of high-specification high-voltage cables, and greatly saves the transformation cost.

[0013] 2. The utility model connects the high-speed and low-speed switching knife box of the circulating water pump with the DCS. When the state needs to be switched, it is only necessary to pull the high-voltage switch to the isolation position. At this time, the position state will be sent to the high-speed and low-speed switching knife box of the circulating water pump, and the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2 will be energized and de-energized to enable and prohibit the operation of the high-speed knife and the low-speed knife.

[0014] 3. The rated current of the switch box of the utility model is 1000A, which can safely realize the high and low speed switching of the circulating water pump below 2000kW and leave enough current margin. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a high-safety dual-speed switching device for a circulating water pump motor provided in this application;

[0016] Figure 2a-2c The secondary principle diagram of the double-speed switching device lock provided for this application;

[0017] Explanation of the reference numerals: power switch 1, high-voltage cable 2, circulating water pump high- and low-speed switching knife box 3, high-speed knife QS1, low-speed knife QS2, high-speed lead 4, low-speed lead 5, motor 6, first electromagnetic lock DQ1, second electromagnetic lock DQ2, third electromagnetic lock DQ3. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in this technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0019] Embodiment 1:

[0020] like Figure 1As shown, Embodiment 1 of the present application provides a high-safety circulating water pump motor dual-speed switching device, including a power switch 1, a high-voltage cable 2, a circulating water pump high- and low-speed switching knife box 3, a high-speed knife QS1, a low-speed knife QS2, a high-speed lead 4, a low-speed lead 5 and a motor 6;

[0021] The power switch 1 can be a 6kV power switch, which is connected to the high-speed switch box 3 of the circulating water pump by laying a high-voltage cable 2, and the high-speed switch QS1 in the cabinet is connected to the high-speed lead 4 to realize the high-speed operation of the motor 6, or the low-speed switch QS2 in the cabinet is connected to the low-speed lead 5 to realize the low-speed operation of the motor 6. The high-speed switch QS1 and the low-speed switch QS2 are mechanically locked and cannot be closed at the same time to ensure the safe operation of the motor.

[0022] Specifically, the components of the dual-speed switching device for the circulating water pump motor include:

[0023] The isolating switch is 1 GN19-10 / 1000 with a phase spacing of 210mm. The operating mechanism is JSXCN with electromagnetic lock. The busbar is TMY-60X6. The outer dimensions of the high-low speed switching knife box 3 of the circulating water pump are 950*1060*2350.

[0024] Embodiment 2:

[0025] Based on Example 1, Example 2 of the present application provides a more specific high-safety circulating water pump motor dual-speed switching device, including a power switch 1, a high-voltage cable 2, a circulating water pump high- and low-speed switching knife box 3, a high-speed knife QS1, a low-speed knife QS2, a high-speed lead 4, a low-speed lead 5, and a motor 6.

[0026] The high-speed knife switch QS1 and the low-speed knife switch QS2 have electrical interlocks. Specifically, they also include the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2; the operation permission and prohibition of the high-speed knife switch QS1 and the low-speed knife switch QS2 are realized by the power on and power off of the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2. For example, when the second electromagnetic lock DQ2 is powered on, the low-speed knife switch QS2 is closed, the first electromagnetic lock DQ1 is de-energized, the high-speed knife switch QS1 is opened, and the low-speed state is entered; on the contrary, when the second electromagnetic lock DQ2 is de-energized, the low-speed knife switch QS2 is opened, the first electromagnetic lock DQ1 is powered on, the high-speed knife switch QS1 is closed, and the high-speed state is entered.

[0027] Figure 2a and Figure 2c This is the schematic diagram of the electrical interlock in the open state (the opposite is true in the closed state). Figure 2aAs shown, the device also includes a local display light. When the low-speed knife QS2 is closed and the high-speed knife QS1 is open, the motor 6 enters a low-speed state and the low-speed indicator light is on; when the high-speed knife QS1 is closed and the low-speed knife QS2 is open, the motor 6 enters a high-speed state and the high-speed indicator light is on. Figure 2c It is further shown that the device provides status display to a remote CRT.

[0028] In addition, the first electromagnetic lock DQ1 is DSN-1 / Y (AC 220V), which is used to lock the high-speed switch; the second electromagnetic lock DQ2 is DSN-1 / Z (AC 220V). Figure 2b As shown, a third electromagnetic lock DQ3 is also included; the third electromagnetic lock DQ3 is used to control the door opening and closing of the circulating water pump high and low speed switching switch box 3. For example, the third electromagnetic lock DQ3 is DSN-AMY (AC 220V). Figure 2b The node status under is also in the open state, which is reversed in the closed state.

[0029] like Figure 2a-2c As shown, the high-low speed switching knife box 3 of the circulating water pump is connected to the distributed control system. When the circulating pump switch is pulled to the isolation position, and only when the low-speed knife QS2 is in the open state, the high-speed knife QS1 can be operated; when the circulating pump switch is pulled to the isolation position, and only when the high-speed knife QS1 is in the open state, the low-speed knife QS2 can be operated; when the circulating water pump high-pressure switch QF is in the isolation position and the switch QF ground knife is in the closed state, the third electromagnetic lock DQ3 of the cabinet door can be opened to check the knife body. The high-voltage five-defense interlocking function is realized through the cooperation of the above related nodes and electromagnetic locks to ensure the safety of operation and maintenance. Among them, the node status is the knife open state, and the closing state is reversed.

[0030] In addition, the rated current of the circulating water pump high-low speed switching switch box 3 is 1000A, which can safely realize the high- and low-speed switching of circulating water pumps below 2000kW and leave sufficient current margin.

[0031] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiment 1 can be referenced to each other and will not be described in detail in this application.

Claims

1. A high-safety circulating water pump motor dual-speed switching device, characterized in that: It includes a power switch (1), a high-voltage cable (2), a high-speed and low-speed switching knife box (3) for a circulating water pump, a high-speed knife QS1, a low-speed knife QS2, a high-speed lead (4), a low-speed lead (5) and a motor (6); The power switch (1) is connected to one end of the high-speed and low-speed switching knife box (3) of the circulating water pump through the high-voltage cable (2); a high-speed knife QS1 and a low-speed knife QS2 are arranged in the high-speed and low-speed switching knife box (3) of the circulating water pump; the high-speed knife QS1 is connected to the motor (6) through the high-speed lead (4), and the low-speed knife QS2 is connected to the motor (6) through the low-speed lead (5); the high-speed knife QS1 and the low-speed knife QS2 are mechanically locked and cannot be closed at the same time.

2. The high-safety circulating water pump motor dual-speed switching device according to claim 1 is characterized in that: The high-speed knife switch QS1 and the low-speed knife switch QS2 have electrical interlocking.

3. The high-safety circulating water pump motor dual-speed switching device according to claim 2 is characterized in that: It also includes a first electromagnetic lock DQ1 and a second electromagnetic lock DQ2; the operation permission and prohibition of the high-speed knife switch QS1 and the low-speed knife switch QS2 are achieved by energizing and de-energizing the first electromagnetic lock DQ1 and the second electromagnetic lock DQ2.

4. The high-safety circulating water pump motor dual-speed switching device according to claim 3 is characterized in that: It also includes a third electromagnetic lock DQ3; the third electromagnetic lock DQ3 is used to control the opening and closing of the cabinet door of the high-speed and low-speed switching knife box (3) of the circulating water pump.

5. The high-safety circulating water pump motor dual-speed switching device according to claim 1 is characterized in that: The rated current of the circulating water pump high-low speed switching switch box (3) is 1000A.

6. The high-safety circulating water pump motor dual-speed switching device according to any one of claims 1 to 5, characterized in that: The circulating water pump high-low speed switching switch box (3) is connected to the distributed control system.

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