阅读说明：本技术 一种液体电阻软启动柜压力保护装置及方法 (Pressure protection device and method for liquid resistor soft start cabinet ) 是由 贾振吉 于 2019-09-11 设计创作，主要内容包括：本发明涉及一种液体电阻软启动柜压力保护装置及方法,包括液阻柜,液阻柜内设置液体箱,液体箱内设置动极板和静极板,动极板的上端套接在传动丝杆上,并设有限位挡指,限位挡指的上下行程范围内还分别对应设有SQ2上限位行程开关和SQ1下限位行程开关；所述静极板固定安装在液体箱的底部,并设有与芯片连接的集成式压力传感器,芯片的信号输出端外接静极板连接排,静极板连接排设置在液阻柜内,液阻柜与开关柜的主控电路连接,在静极板连接排在与开关柜连接的主控电路上还短接有1KM接触器。本发明在液体箱底部嵌入压力传感器,通过芯片输出无源开关信号,从而控制主回路开关,切断电源达到更有效保护的目的,将拥有广泛的市场价值。(The invention relates to a pressure protection device and a pressure protection method for a liquid resistor soft start cabinet, which comprises a liquid resistor cabinet, wherein a liquid tank is arranged in the liquid resistor cabinet, a movable polar plate and a static polar plate are arranged in the liquid tank, the upper end of the movable polar plate is sleeved on a transmission screw rod and is provided with a limiting stop finger, and an upper limiting travel switch SQ2 and a lower limiting travel switch SQ1 are respectively and correspondingly arranged in the upper and lower travel ranges of the limiting stop finger; the static polar plate is fixedly installed at the bottom of the liquid tank and provided with an integrated pressure sensor connected with the chip, the signal output end of the chip is externally connected with a static polar plate connecting bar, the static polar plate connecting bar is arranged in the liquid resistance cabinet, the liquid resistance cabinet is connected with a main control circuit of the switch cabinet, and the static polar plate connecting bar is also short-circuited with a 1KM contactor on the main control circuit connected with the switch cabinet. According to the invention, the pressure sensor is embedded at the bottom of the liquid tank, and the chip outputs a passive switch signal, so that the main loop switch is controlled, the power supply is cut off, the purpose of more effective protection is achieved, and the liquid tank has wide market value.)

1. A pressure protection device of a liquid resistor soft start cabinet comprises a liquid resistor cabinet (1), wherein a liquid tank (2) is arranged in the liquid resistor cabinet (1); the method is characterized in that: a movable polar plate (3) and a static polar plate (4) are arranged in the liquid tank (2); the movable polar plate (3) is connected to a transmission screw rod (18), the lower end of the transmission screw rod (18) is installed in a lower fixed seat (5), the upper end of the transmission screw rod (18) is installed in an upper fixed seat (6) and penetrates through the upper fixed seat (6) to be connected with a belt pulley (7), the upper end of the movable polar plate (3) is sleeved on the transmission screw rod (18) and is arranged between the upper fixed seat (6) and the lower fixed seat (5), and a limiting stop finger (8) is pressed on the upper end of the movable polar plate (3) through a screw assembly; an upper limit travel switch (9) of SQ2 and a lower limit travel switch (10) of SQ1 are correspondingly arranged in the upper and lower travel range of the limit stop finger (8), the lower limit travel switch (10) of SQ1 is connected with the lower limit protection travel switch (11) of SQ3, and the upper limit travel switch (9) of SQ2 is connected with the upper limit protection travel switch (12) of SQ 4;

The lower end face of moving polar plate (3) is corresponding with the up end of quiet polar plate (4), quiet polar plate (4) fixed mounting is in the bottom of liquid tank (2), and the junction of quiet polar plate (4) and liquid tank (2) is equipped with integrated form pressure sensor (13), integrated form pressure sensor (13) connect chip (14), the external quiet polar plate run-on (15) of the signal output part of chip (14), quiet polar plate run-on (15) set up in liquid resistance cabinet (1), the main control circuit of liquid resistance cabinet (1) and cubical switchboard (16) is connected, still short-circuit 1KM contactor (17) on the main control circuit of being connected with cubical switchboard (16) of quiet polar plate run-on (15).

2. The pressure protection device for the liquid resistance soft start cabinet as claimed in claim 1, wherein: electrolyte filled in the liquid tank (2) forms a liquid resistor R, and the liquid resistor R is connected with a main control circuit in the liquid resistor cabinet (1).

3. The pressure protection device for the liquid resistance soft start cabinet as claimed in claim 1, wherein: the input ends of the main control circuits of the switch cabinet (16) and the liquid resistance cabinet (1) are connected with a circuit breaker QF 1.

4. the pressure protection device for the liquid resistance soft start cabinet as claimed in claim 1, wherein: the upper limit travel switch (9) of the SQ2 and the lower limit travel switch (10) of the SQ1 are connected in parallel to a main control circuit of the liquid resistance cabinet (1) and correspond to KM2 and KM1 respectively.

5. the pressure protection device for the liquid resistance soft start cabinet as claimed in claim 1, wherein: the movable polar plate (3) and the static polar plate (4) are made of high-quality copper plates.

6. the pressure protection device for the liquid resistance soft start cabinet as claimed in claim 1, wherein: the model of chip (14) selects for use to be STM32F103ZET6, and it includes signal transmission module, signal amplification module, signal comparison module and signal output module.

7. the pressure protection method for the liquid resistance soft start cabinet according to claim 1, characterized by comprising the following steps: the method comprises the following steps:

s1: initial state: the transmission screw rod (18) is driven by the belt pulley (7) to rotate anticlockwise, the movable pole plate (3) moves upwards, and the limiting stop finger (8) at the upper end of the transmission screw rod is contacted with the limiting travel switch (9) on the SQ 2;

S2: the working state is as follows: the transmission screw rod (18) is driven by the belt pulley (7) to rotate clockwise, the movable polar plate (3) descends, the limiting stop finger (8) at the upper end of the transmission screw rod is contacted with the SQ1 lower limiting travel switch (10) to automatically stop descending, the movable polar plate (3) is not contacted with the static polar plate (4), the bottom pressure is not changed, the integrated pressure sensor (13) has no signal output, and the liquid resistance cabinet (1) is normally started;

S3: and (4) fault protection A: the transmission screw rod (18) is driven by the belt pulley (7) to rotate clockwise, the movable polar plate (3) descends, the movable polar plate (3) is in contact with the static polar plate (4), the output signal of the integrated pressure sensor (13) below the static polar plate (4) is increased, when the output signal exceeds + 5% of a set value, the chip (14) outputs a protection signal, and the 1KM contactor (17) controls the main loop to be disconnected, so that the protection effect is achieved;

S4: and (4) fault protection B: when the liquid tank (2) is impacted by temperature change or external force accident, the local part of the liquid tank (2) cracks, electrolyte filled inside leaks, the pressure at the bottom of the tank body is reduced, the output signal of the integrated pressure sensor (13) is reduced, when the pressure exceeds a set value of-5%, the protection signal is output, the chip (14) protects the signal output, and the main loop is controlled to be disconnected through the 1KM contactor (17), so that the protection effect is achieved.

Technical Field

the invention relates to a liquid resistor starting cabinet, in particular to a pressure protection device and method for a liquid resistor soft starting cabinet.

Background

the liquid resistance starting cabinet is a mode commonly adopted by the large and medium-sized motor at present, and the purpose of voltage reduction starting is achieved by serially connecting a variable liquid resistance which plays the roles of current limiting and voltage dividing into a motor stator loop (a squirrel cage motor); or the rotor loop (winding motor) is connected in series with the variable liquid resistor, so that the winding motor can achieve the aim of smooth soft start with large torque and small current.

The liquid resistance is adjustable and is steplessly changed from large to small in the starting process, so that the soft starting process of the motor with low current, low voltage and no impact is realized; the liquid resistance box of the liquid resistance soft starting cabinet on the market at present only has liquid level protection and temperature protection, and has no weighing (pressure) protection function.

When the lower limit failure leads the actuating polar plate to continuously descend and hit the lower polar plate (the bottom of the liquid tank), the transmission mechanism and the liquid tank can be damaged, and accidents occur; when the liquid tank leaks, accidents also occur.

disclosure of Invention

In view of the above situation, there is a need for a pressure protection device and method for a liquid resistance soft start cabinet, in which a pressure sensor is embedded at the bottom of a liquid tank, and a transmitter is used to detect, amplify, compare and drive a loop to output a passive switch signal, so as to control a main loop switch (1KM coil is de-energized) to be turned off, and to cut off a power supply, thereby achieving the purpose of more effective protection.

a pressure protection device of a liquid resistor soft start cabinet comprises a liquid resistor cabinet, wherein a liquid tank is arranged in the liquid resistor cabinet; a movable polar plate and a static polar plate are arranged in the liquid tank; the upper end of the movable polar plate is sleeved on the transmission screw rod and arranged between the upper fixing seat and the lower fixing seat, and the upper end of the movable polar plate is also pressed with a limit stop finger through a screw assembly; an upper limit travel switch of SQ2 and a lower limit travel switch of SQ1 are correspondingly arranged in the upper and lower travel ranges of the limit stop finger respectively, the lower limit travel switch of SQ1 is connected with the lower limit protection travel switch of SQ3, and the upper limit travel switch of SQ2 is connected with the upper limit protection travel switch of SQ 4;

The lower end face of the movable polar plate corresponds to the upper end face of the static polar plate, the static polar plate is fixedly installed at the bottom of the liquid tank, an integrated pressure sensor is arranged at the connecting position of the static polar plate and the liquid tank, the integrated pressure sensor is connected with a chip, the signal output end of the chip is externally connected with a static polar plate connecting bar, the static polar plate connecting bar is arranged in a liquid resistance cabinet, the liquid resistance cabinet is connected with a main control circuit of the switch cabinet, and the static polar plate connecting bar is further short-circuited with a 1KM contactor on the main control circuit connected with the switch cabinet.

Furthermore, electrolyte filled in the liquid tank forms a liquid resistor R, and the liquid resistor R is connected with a main control circuit in the liquid resistor cabinet.

Furthermore, the input ends of the main control circuits of the switch cabinet and the liquid resistance cabinet are connected with a circuit breaker QF 1.

Furthermore, the SQ2 upper limit travel switch and the SQ1 lower limit travel switch are connected in parallel to a main control circuit of the liquid resistance cabinet and correspond to KM2 and KM1 respectively.

Furthermore, the movable polar plate and the static polar plate are made of high-quality copper plates.

Furthermore, the model of the chip is selected to be STM32F103ZET6, and the chip comprises a signal transmitting module, a signal amplifying module, a signal comparing module and a signal output module.

The invention provides another technical scheme, and the pressure protection method of the liquid resistor soft start cabinet comprises the following steps:

s1: initial state: the transmission screw rod is driven by the belt pulley to rotate anticlockwise, the movable polar plate moves upwards, and a limit stop finger at the upper end of the movable polar plate is in contact with a limit travel switch on the SQ 2;

S2: the working state is as follows: the transmission screw rod is driven by the belt pulley to rotate clockwise, the movable polar plate descends, the limiting stop finger at the upper end of the transmission screw rod is contacted with the SQ1 lower limiting travel switch to automatically stop descending, the movable polar plate is not contacted with the static polar plate, the bottom pressure is unchanged, the integrated pressure sensor does not output signals, and the liquid resistance cabinet starts normally;

s3: and (4) fault protection A: the transmission screw rod is driven by the belt pulley to rotate clockwise, the movable polar plate descends and is contacted with the static polar plate, the output signal of the integrated pressure sensor below the static polar plate is increased, when the output signal exceeds + 5% of a set value, a chip protection signal is output, and the main loop is controlled to be disconnected through the 1KM contactor, so that the protection effect is achieved;

S4: and (4) fault protection B: when the liquid tank is impacted by temperature change or external force accident, the local part of the liquid tank is cracked, the electrolyte filled in the liquid tank leaks, the pressure at the bottom of the tank body is reduced, the output signal of the integrated pressure sensor is reduced, when the output signal exceeds a set value of-5%, the protection signal is output, the chip protects the signal output, and the 1KM contactor controls the main loop to be disconnected, so that the protection effect is achieved.

The pressure protection device and the method for the liquid resistance soft start cabinet provided by the invention aim at the liquid resistance start cabinet of the current large and medium-sized motor, which mainly takes temperature and liquid level protection, and the protection of the pressure control device manufactured on the basis of the pressure sensor is a novel protection measure which cannot be replaced by the current mainstream protection, and has wide market value.

Drawings

FIG. 1 is a schematic diagram of a wound motor control according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a cage motor control according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the initial state structure of the dynamic and static plates in step one according to the embodiment of the present invention;

FIG. 4 is a structural diagram of the dynamic and static plates in the second step of the present invention under normal operating conditions;

FIG. 5 is a structural diagram of a fault state of a moving plate and a static plate in the third step of the present invention;

FIG. 6 is a schematic diagram of the connection of the pressure sensor and the chip control signal according to the embodiment of the invention.

In the figure: 1. a liquid resistance cabinet; 2. a liquid tank; 3. a movable polar plate; 4. a static polar plate; 5. a lower fixed seat; 6. an upper fixed seat; 7. a belt pulley; 8. a limiting stop finger; 9. an upper limit travel switch SQ 2; 10. SQ1 lower limit travel switch; 11. a SQ3 lower limit protection travel switch; 12. an upper limit protection travel switch on SQ 4; 13. an integrated pressure sensor; 14. a chip; 15. the static polar plates are connected in rows; 16. a switch cabinet; 17. 1KM contactor, 18 and a transmission screw rod.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, further details of the pressure protection device for liquid resistance soft start cabinet of the present invention are provided. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-6, a pressure protection device for a liquid resistance soft start cabinet according to an embodiment of the present invention includes a liquid resistance cabinet 1, wherein a liquid tank 2 is disposed in the liquid resistance cabinet 1; a movable polar plate 3 and a static polar plate 4 are arranged in the liquid tank 2; the movable polar plate 3 is connected to a transmission screw rod 18, the lower end of the transmission screw rod 18 is installed in a lower fixed seat 5, the upper end of the transmission screw rod 18 is installed in an upper fixed seat 6 and penetrates through the upper fixed seat 6 to be connected with a belt pulley 7, the upper end of the movable polar plate 3 is sleeved on the transmission screw rod 18 and is arranged between the upper fixed seat 6 and the lower fixed seat 5, and a limiting stop finger 8 is pressed on the upper end of the movable polar plate 3 through a screw assembly; an upper limit travel switch 9 of SQ2 and a lower limit travel switch 10 of SQ1 are correspondingly arranged in the upper and lower travel ranges of the limit stop finger 8 respectively, the lower limit travel switch 10 of SQ1 is connected with a lower limit protection travel switch 11 of SQ3, and the upper limit travel switch 9 of SQ2 is connected with an upper limit protection travel switch 12 of SQ 4.

The lower end face of the movable polar plate 3 corresponds to the upper end face of the static polar plate 4, the static polar plate 4 is fixedly installed at the bottom of the liquid tank 2, an integrated pressure sensor 13 is arranged at the connecting position of the static polar plate 4 and the liquid tank 2, the integrated pressure sensor 13 is connected with a chip 14, a signal output end of the chip 14 is externally connected with a static polar plate connecting bar 15, the static polar plate connecting bar 15 is arranged in the liquid resistance cabinet 1, the liquid resistance cabinet 1 is connected with a main control circuit of a switch cabinet 16, and the static polar plate connecting bar 15 is also short-connected with a 1KM contactor 17 on the main control circuit connected with the switch cabinet 16.

in the above embodiment, the electrolyte filled in the liquid tank 2 constitutes the liquid resistor R, and the liquid resistor R is connected to the main control circuit in the liquid resistor cabinet 1.

in the above embodiment, the input terminals of the main control circuits of the switch cabinet 16 and the liquid resistance cabinet 1 are both connected with the circuit breaker QF 1.

in the above embodiment, the SQ2 upper limit travel switch 9 and the SQ1 lower limit travel switch 10 are connected in parallel to the main control circuit of the liquid resistor cabinet 1, and correspond to KM2 and KM1, respectively.

In the above embodiment, the movable pole plate 3 and the static pole plate 4 are made of high-quality copper plates.

In the above embodiment, the model of the chip 14 is selected as STM32F103ZET6, which includes a signal transmitting module, a signal amplifying module, a signal comparing module and a signal outputting module.

In order to better explain the invention, an embodiment based on the device is also provided, and the method for protecting the pressure of the liquid resistor soft start cabinet comprises the following steps:

The first step is as follows: initial state: the transmission screw rod 18 is driven by the belt pulley 7 to rotate anticlockwise, the movable polar plate 3 moves upwards, and the limit stop finger 8 at the upper end of the transmission screw rod is contacted with the limit travel switch 9 on the SQ2, please refer to FIG. 3;

the second step is that: the working state is as follows: the transmission screw rod 18 is driven by the belt pulley 7 to rotate clockwise, the movable polar plate 3 descends, the limit stop finger 8 at the upper end of the transmission screw rod is contacted with the SQ1 lower limit travel switch 10 to automatically stop descending, the movable polar plate 3 is not contacted with the static polar plate 4, the bottom pressure is unchanged, the integrated pressure sensor 13 has no signal output, and the hydraulic resistance cabinet 1 starts normally, please refer to FIG. 4;

The third step: and (4) fault protection A: the transmission screw 18 is driven by the belt pulley 7 to rotate clockwise, the movable polar plate 3 descends, the movable polar plate 3 is in contact with the static polar plate 4, the output signal of the integrated pressure sensor 13 below the static polar plate 4 is increased, when the output signal exceeds + 5% of a set value, the chip 14 protects the signal output, and the 1KM contactor 17 controls the disconnection of a main loop to play a protection role, please refer to FIG. 5;

The fourth step: and (4) fault protection B: when the liquid tank 2 is impacted by temperature change or external force accident, the local part of the liquid tank 2 cracks, electrolyte filled inside leaks, the pressure at the bottom of the tank body is reduced, the output signal of the integrated pressure sensor 13 is reduced, when the output signal exceeds a set value of-5 percent, the protection signal is output, the chip 14 protects the signal output, and the 1KM contactor 17 controls the main loop to be disconnected so as to play a protection role.

The working principle is as follows: the invention provides a liquid resistance soft start cabinet pressure protection device and method, the pressure control device made of integrated pressure sensor 13 is generally called electronic weighing system, the products of the present electronic weighing system are not only of many varieties, economical, practical, mature, safe and reliable, but also more and more integrated and miniaturized, the basic weighing products in proper range are selected, and then the chip 14 is prepared for output, thus realizing the signal which needs to be controlled due to the weight change; when the liquid resistance cabinet 1 is shaped, the total weight of the liquid tank 2 is basically kept unchanged, the integrated pressure sensor 13 embedded at the bottom of the liquid tank 2 detects the weight signal of the liquid tank 2 constantly, and when the liquid tank 2 is subjected to external force or liquid in the tank is omitted, a protection loop outputs a passive switch signal no matter the weight of the liquid tank 2 is increased or reduced, and a power supply is cut off to achieve the purpose of more effective protection; the weight of the liquid tank 2 is increased to indicate that the movable polar plate 3 does not stop descending as required; a reduction in the weight of the liquid tank 2 indicates a leak (or a rupture in the tank), both of which are protected.

In summary, the following steps: the invention provides a pressure protection device and a method for a liquid resistance soft start cabinet, which aim at the liquid resistance start cabinet of the current large and medium-sized motor, mainly take temperature and liquid level protection, and take pressure sensor as the protection of a pressure control device manufactured on the basis of the pressure sensor, so that the protection device is a novel protection measure which cannot be replaced by the current mainstream protection, has wide market value, is embedded with the pressure sensor at the bottom of a liquid tank 2, and outputs a passive switch signal through a signal transmitting module, a signal amplifying module, a signal comparing module and a signal output module in a chip 14, thereby controlling a main loop switch, namely a 1KM contactor 17 to be disconnected after power failure, and cutting off a power supply to achieve the purpose of more effective protection.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.