Dry-burning-resistant brake resistor and gear rack elevator control system

Abstract

The utility model relates to the field of gear and rack lifters, in particular to a dry-burning-resistant braking resistor and a gear and rack lifter control system.The dry-burning-resistant braking resistor comprises a resistance wire and a mounting pipe, the resistance wire is arranged in the mounting pipe, the length direction of the resistance wire is consistent with the extending direction of the mounting pipe, and the length direction of the mounting pipe is consistent with the length direction of the mounting pipe. The mounting pipe is integrally arranged; a filler space is arranged between the outer wall of the resistance wire and the inner wall of the mounting pipe, the filler space is filled with sand, and the sand is used for isolating the resistance wire from the inner wall of the mounting pipe; the two ends of the resistance wire in the length direction are fixedly provided with connectors, the two connectors are fixedly connected with the end walls of the two ends of the installation pipe in the length direction respectively, the connectors and the ends of the installation pipe are arranged in a sealed mode, and the connectors are used for being connected with a frequency converter. The application has the effects of prolonging the service life of the brake resistor and reducing the damage probability of the frequency converter and the elevator.

Description

Technical Field

[0001] The present application relates to the field of rack and pinion elevators, and in particular to a dry-burning resistant brake resistor and a rack and pinion elevator control system. Background Art

[0002] Braking resistor is an important component of rack and pinion elevator. It is mainly used for inverter-controlled motor rapid pause. It can convert the electrical energy generated by the motor of rack and pinion elevator during braking into heat energy and release it.

[0003] In the prior art, the commonly used brake resistors for elevators are corrugated resistors and aluminum shell resistors; since the rack and pinion elevator will vibrate during operation, the brake resistor usually works under high temperature and vibration conditions. The insulating coating on the surface of the corrugated resistor will oxidize and disappear when it is in a high temperature state for a long time, which can easily cause the corrugated resistor that has lost the protection of the insulating coating to become loose; when the elevator is running under high temperature and vibration conditions, the aluminum shell resistor will leak sand, causing the resistance wire inside the aluminum shell resistor to loosen.

[0004] When the heating resistor becomes loose, there is a possibility that the inverter IGBT will be grounded due to the grounding of the heating resistor, thereby causing damage to the inverter IGBT, resulting in a higher failure rate for the rack and pinion elevator, affecting the reliability of the elevator equipment. Utility Model Content

[0005] In order to extend the service life of the brake resistor and reduce the probability of damage to the inverter and the elevator, the present application provides a dry-burning resistant brake resistor and a rack and pinion elevator control system.

[0006] In the first aspect, the present application provides a dry-burning resistant brake resistor adopting the following technical solution:

[0007] A dry-burning resistant brake resistor comprises a resistance wire and a mounting tube, wherein the resistance wire is arranged inside the mounting tube, the length direction of the resistance wire is consistent with the extension direction of the mounting tube, and the mounting tube is arranged in an integral manner; a filling space is arranged between the outer wall of the resistance wire and the inner wall of the mounting tube, and the filling space is filled with sand material, and the sand material is used to block the resistance wire from the inner wall of the mounting tube; connectors are fixedly arranged at both ends of the resistance wire in the length direction, and the two connectors are respectively fixedly connected to the end walls at both ends of the mounting tube in the length direction, and the connectors are sealed with the ends of the mounting tube, and the connectors are used to connect a frequency converter.

[0008] By adopting the above technical scheme, the resistance wire is arranged in the installation tube, and the resistance wire is connected to the frequency converter through the connector; the sand in the filling space can block the outer wall of the resistance wire from the inner wall of the installation tube, reducing the possibility of contact between the resistance wire and the inner wall of the installation tube; the installation tube is arranged as an integral part to reduce the possibility of sand flowing out of the installation tube shell, thereby reducing the possibility of displacement of the resistance wire due to external vibration, thereby reducing the probability of the brake resistor being grounded due to external vibration during the operation of the elevator, and extending the service life of the brake resistor.

[0009] Optionally, heat sinks are arranged around the outer wall of the mounting tube, and the heat sinks are evenly distributed along the extension direction of the mounting tube.

[0010] By adopting the above technical solution, the heat sink has good heat dissipation performance, can quickly dissipate the heat generated by the resistance wire during operation, reduce the possibility of overheating and damage of the resistance wire, extend the service life of the brake resistor, and reduce the probability of damage to the inverter and the elevator.

[0011] Optionally, a resistor cover is further included, wherein a mounting cavity for placing the mounting tube is provided inside the resistor cover, and the mounting tube is arranged on an inner wall of the mounting cavity.

[0012] By adopting the above technical solution, since the temperature of the brake resistor is relatively high during operation, placing the mounting tube and the resistance wire in the resistor cover can reduce the possibility of the brake resistor being accidentally touched by personnel during operation; in addition, the resistor cover can block rainwater and the like, reduce the possibility of the brake resistor short-circuiting due to rainwater seeping into the mounting tube, and improve the safety of the brake resistor.

[0013] Optionally, two wiring terminals are provided on the resistor cover, and the two wiring terminals are arranged one-to-one with the two connectors; one end of the wiring terminal is connected to the connector, and the other end is used to connect to the frequency converter.

[0014] By adopting the above technical solution, the end of the terminal away from the connector can be connected to the inverter. The staff uses a wire to connect the terminal to the inverter to complete the installation of the brake resistor and the inverter, making it easier for the staff to connect the brake resistor.

[0015] Optionally, the mounting tube is arranged to extend in a curved manner.

[0016] By adopting the above technical solution, since the resistance cover is installed on the elevator car, the available length of the resistance cover is limited; the installation tube is bent and extended within the limited length of the resistance cover, so that the total length of the installation tube can be increased within the limited installation length, so that the staff can assemble the installation tube and the resistance cover at the designated position of the elevator car.

[0017] Optionally, the two connectors face the same direction; and the two wiring terminals are arranged on the same side wall of the resistor cover.

[0018] By adopting the above technical solution, the two terminals are arranged on the same side of the resistor cover, which can improve the convenience of connecting the brake resistor and the inverter and reduce the length of the wires required for connecting the terminals and the inverter.

[0019] Optionally, a plurality of heat dissipation holes are formed through the side wall of the resistor cover, one end of the heat dissipation hole is connected to the installation cavity, and the other end of the heat dissipation hole is connected to the outside.

[0020] By adopting the above technical solution, the heat generated by the resistance wire can be dissipated into the air outside the resistance cover through the heat dissipation hole, thereby reducing the possibility of the brake resistor working in a high temperature state for a long time and extending the service life of the brake resistor.

[0021] In the second aspect, the present application provides a rack and pinion elevator control system, which adopts the following technical solution:

[0022] A rack and pinion elevator control system includes a power supply module, a frequency converter, a motor and a plurality of the above-mentioned braking resistors; the plurality of braking resistors are connected to the frequency converter; the signal output end of the power supply module is communicatively connected to the signal input end of the frequency converter; the signal output end of the frequency converter is communicatively connected to the signal input end of the motor; a switch component is connected in series between the signal output end of the frequency converter and the motor, and the switch component is used to control the start and close of the motor.

[0023] By adopting the above technical solution, the frequency converter can convert the AC power provided by the power module into variable-frequency AC power and provide it to the motor, and control the speed of the motor by changing the frequency of the AC power supply, thereby realizing the control of the operating state of the rack and pinion elevator; the braking resistor can protect the frequency converter, and convert the electrical energy generated by the elevator when it stops quickly into heat energy for consumption, thereby realizing the rapid shutdown of the elevator; the switch assembly can control the opening and closing of the motor, so that the staff can manually control the opening and closing of the motor, so as to facilitate the control and maintenance of the motor and improve the safety of the rack and pinion elevator.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The resistance wire is set in the installation tube. The sand material between the outer wall of the resistance wire and the inner wall of the installation tube can block the outer wall of the resistance wire from the inner wall of the installation tube, reducing the possibility of contact between the resistance wire and the inner wall of the installation tube, thereby reducing the possibility of displacement of the resistance wire due to external vibration, thereby reducing the possibility of grounding of the brake resistor, extending the service life of the brake resistor, and reducing the probability of damage to the inverter and elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the dry-burning resistant brake resistor in Example 1;

[0027] Figure 2 is a schematic cross-sectional view of the end face of the mounting tube in Example 1;

[0028] Figure 3 A partial cross-sectional view of the resistor cover in the present embodiment 1;

[0029] Figure 4 This is the circuit diagram of the rack and pinion elevator control system in Example 2.

[0030] Figure numerals: 1. resistance wire; 11. connector; 2. mounting tube; 21. heat sink; 3. filling space; 4. sand; 5. resistor cover; 51. mounting cavity; 52. terminal; 53. heat dissipation hole; 6. power module; 7. inverter; 8. motor; 9. switch assembly. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The embodiment of the present application discloses a dry-burning resistant brake resistor and a rack and pinion elevator control system.

[0033] Example 1

[0034] The embodiment of the present application discloses a dry-burning resistant brake resistor.

[0035] Reference Figure 1 and Figure 2 A dry-burning resistant brake resistor includes a resistance wire 1 and a mounting tube 2, the length direction of the resistance wire 1 is consistent with the length direction of the mounting tube 2; the resistance wire 1 is passed through the interior of the mounting tube 2, and there is a filling space 3 between the outer wall of the resistance wire 1 and the inner wall of the mounting tube 2, and the interior of the filling space 3 is tightly filled with sand 4; after the sand 4 is injected into the filling space 3, the outer wall of the resistance wire 1 and the inner wall of the mounting tube 2 can be blocked, reducing the possibility of contact between the resistance wire 1 and the inner wall of the mounting tube 2, thereby reducing the possibility of displacement of the resistance wire 1 due to external jitter, and further reducing the possibility of the brake resistor being grounded due to external vibration when the elevator is running, extending the service life of the brake resistor, and reducing the probability of damage to the inverter 7 and the elevator.

[0036] The sand material 4 of this embodiment is quartz sand, which has excellent properties such as high temperature stability, electrical insulation and chemical corrosion resistance. It can block the installation tube 2 and the resistance wire 1, reduce the possibility of contact between the resistance wire 1 and the inner wall of the installation tube 2, and play a role in stabilizing the resistance value.

[0037] Reference Figure 1 and Figure 2 In this embodiment, the mounting tube 2 is made of seamless stainless steel tube. The stainless steel tube has relatively stable chemical properties and high mechanical strength. It is not easy to bend or deform when subjected to external vibration, thereby reducing the possibility of bending or deformation of the brake resistor after long-term use, thereby extending the service life of the brake resistor; the mounting tube 2 is integrally formed, thereby reducing the possibility of sand material 4 in the mounting tube 2 being lost from the weld of the mounting tube 2, improving the stability between the mounting tube 2 and the resistance wire 1, and extending the service life of the brake resistor.

[0038] Reference Figure 1 The outer wall of the mounting tube 2 is surrounded by a heat sink 21, and the heat sink 21 is evenly distributed along the extension direction of the mounting tube 2; when the brake resistor works in a high temperature environment, the heat dissipated by the resistance wire 1 during operation is conducted to the heat sink 21 on the mounting tube 2 through the sand material 4. The heat sink 21 has good heat dissipation performance and quickly dissipates the heat generated by the resistance wire 1, thereby reducing the possibility of overheating damage to the resistance wire 1, extending the service life of the brake resistor, and reducing the probability of damage to the inverter 7 and the elevator.

[0039] The heat sink 21 of the present embodiment is made of aluminum alloy. The heat sink 21 made of aluminum alloy has good heat dissipation performance, light weight, and low cost. It can reduce the manufacturing cost of the brake resistor while improving the heat dissipation effect of the brake resistor.

[0040] Reference Figure 1 Both ends of the resistance wire 1 in the length direction are protruding with connectors 11 for connecting to the frequency converter 7, and the two connectors 11 are fixedly connected to the end walls of the mounting tube 2 at both ends in the length direction; part of the outer wall of the connector 11 is buckled into the inner wall of the mounting tube 2, and the outer wall of the connector 11 and the inner wall of the mounting tube 2 are sealed, thereby reducing the possibility of the sand 4 inside the filling space 3 flowing out from the joint between the mounting tube 2 and the connector 11 due to vibration, thereby improving the stability between the resistance wire 1 and the mounting tube 2.

[0041] Reference Figure 3 A resistor cover 5 is also provided on the outside of the mounting tube 2, and a mounting cavity 51 for placing the mounting tube 2 is provided inside the resistor cover 5, and the mounting tube 2 is fixedly arranged on the inner wall of the mounting cavity 51; since the temperature of the brake resistor is relatively high during operation, placing the mounting tube 2 and the resistance wire 1 in the resistor cover 5 can reduce the possibility of the brake resistor being accidentally touched during operation; in addition, the resistor cover 5 can block dust and rain in the air, reduce the possibility of short circuit of the brake resistor due to accumulation of rain and dust, and improve the safety of the brake resistor.

[0042] Reference Figure 3Two wiring terminals 52 are provided on the side wall of the resistor cover 5, and the two wiring terminals 52 match the two connectors 11; one end of the wiring terminal 52 is fixedly connected to the connector 11, and the other end extends toward the outer wall of the resistor cover 5, and the end of the wiring terminal 52 away from the connector 11 can be connected to the inverter 7 to facilitate the staff to connect to the braking resistor.

[0043] The mounting tube 2 is bent and extended, and is arranged in a wave shape; the mounting tube 2 can be U-shaped, W-shaped or double W-shaped, etc. The shape or length of the mounting tube 2 can be adjusted according to the actual length of the mounting tube 2 and the on-site space requirements, and this embodiment does not impose any restrictions.

[0044] Reference Figure 1 and Figure 3 Since the brake resistor and the frequency converter 7 are usually installed at the bottom wall of the car, the actual installation process requires the length of the resistor cover 5. The resistor cover 5 is extended by multiple U-shaped structures within the limited length, so that the total length of the installation pipe 2 within the limited installation length is increased, so that the staff can assemble the installation pipe 2 and the resistor cover 5 at the designated position of the elevator car.

[0045] In this embodiment, the connectors 11 at both ends of the resistance wire 1 face the same direction, and the two wiring terminals 52 on the resistance cover 5 are arranged on the side wall on the same side of the resistance cover 5, so as to facilitate the connection and assembly of the connector 11 and the wiring terminals 52 by the staff; the two wiring terminals 52 are both arranged on the same side of the resistance cover 5, which can improve the convenience of connecting the braking resistor and the inverter 7 and reduce the length of the wires required for connecting the wiring terminals 52 and the inverter 7.

[0046] Reference Figure 3 A plurality of heat dissipation holes 53 are formed through the side wall of the resistor cover 5, and the plurality of heat dissipation holes 53 are evenly arranged along the side wall in the thickness direction of the resistor cover 5; one end of the heat dissipation hole 53 is connected to the inside of the mounting cavity 51, and the other end is connected to the outside of the resistor cover 5; the heat generated by the resistance wire 1 can be dissipated from the heat dissipation hole 53 to the outside of the resistor cover 5, so that the resistance wire 1 inside the resistor cover 5 can work at a suitable temperature, reducing the possibility of the brake resistor working in a high temperature state for a long time, and extending the service life of the brake resistor.

[0047] The implementation principle of Example 1 is as follows: the resistance wire 1 is arranged in the installation tube 2, and after the sand material 4 is injected into the filling space 3, the outer wall of the resistance wire 1 can be blocked from the inner wall of the installation tube 2, thereby reducing the possibility of the resistance wire 1 contacting the inner wall of the installation tube 2, thereby reducing the possibility of the resistance wire 1 shifting due to external vibration, and further reducing the possibility of the brake resistor being grounded due to external vibration when the elevator is running;

[0048] When the brake resistor works in a high temperature environment, the heat emitted by the resistance wire 1 during operation is conducted to the heat sink 21 on the mounting tube 2 through the sand material 4. The heat sink 21 has good heat dissipation performance and can quickly dissipate the heat generated by the resistance wire 1, thereby reducing the possibility of damage to the resistance wire 1 due to overheating, extending the service life of the brake resistor, and reducing the probability of damage to the inverter 7 and the elevator.

[0049] Example 2

[0050] The embodiment of the present application discloses a rack and pinion elevator control system.

[0051] Reference Figure 4 A rack and pinion elevator control system includes a power module 6, a frequency converter 7, a motor 8 and a plurality of brake resistors, wherein the signal input end of the frequency converter 7 is communicatively connected to the signal output end of the power module 6, and the signal output end of the frequency converter 7 is communicatively connected to the signal input end of the motor 8; a plurality of dry-burning-resistant brake resistors) are connected to the frequency converter 7 for an interface for external resistors, so that the brake resistors are connected to the brake control device inside the frequency converter 7; a plurality of brake resistors can be connected in parallel to the frequency converter 7, and a plurality of brake resistors can also be connected in series to the frequency converter 7. The staff can select the number of brake resistors and the connection method of the brake resistors according to actual needs, which is not limited in this embodiment.

[0052] The frequency converter 7 can convert the industrial frequency (50Hz or 60Hz) AC power provided by the power module 6 into a variable-frequency AC power supply and provide it to the motor 8. By changing the frequency of the AC power supply, the speed of the motor 8 is controlled to achieve control of the operating state of the rack and pinion elevator; the braking resistor can protect the frequency converter 7 and convert the electrical energy generated by the elevator when it stops quickly into heat energy for consumption, thereby achieving rapid shutdown of the elevator.

[0053] Reference Figure 4 A switch assembly 9 is connected in series between the signal output end of the frequency converter 7 and the motor 8. The switch assembly 9 can control the opening and closing of the motor 8, so that the staff can manually control the opening and closing of the motor 8, so as to facilitate the control and maintenance of the motor 8 and improve the safety of the rack and pinion elevator.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dry burning resistant brake resistor, characterized in that: The invention comprises a resistance wire (1) and a mounting tube (2), wherein the resistance wire (1) is arranged inside the mounting tube (2), the length direction of the resistance wire (1) is consistent with the extension direction of the mounting tube (2), and the mounting tube (2) is arranged in an integral manner; a filling space (3) is arranged between the outer wall of the resistance wire (1) and the inner wall of the mounting tube (2), and the filling space (3) is filled with sand material (4), and the sand material (4) is used to block the resistance wire (1) from the inner wall of the mounting tube (2); connectors (11) are fixedly arranged at both ends of the length direction of the resistance wire (1), and the two connectors (11) are respectively fixedly connected to the end walls of the two ends of the length direction of the mounting tube (2), and the connectors (11) are sealed with the ends of the mounting tube (2), and the connectors (11) are used to connect a frequency converter (7).

2. The dry burning resistant brake resistor according to claim 1, characterized in that: The outer wall of the mounting tube (2) is surrounded by heat sinks (21), and the heat sinks (21) are evenly distributed along the extension direction of the mounting tube (2).

3. The dry burning resistant brake resistor according to claim 1, characterized in that: It also comprises a resistor cover (5), wherein a mounting cavity (51) is provided inside the resistor cover (5) for placing the mounting tube (2), and the mounting tube (2) is arranged on the inner wall of the mounting cavity (51).

4. The dry burning resistant brake resistor according to claim 3, characterized in that: The resistor cover (5) is provided with two wiring terminals (52), and the two wiring terminals (52) are arranged one-to-one with the two connectors (11); one end of the wiring terminal (52) is connected to the connector (11), and the other end is used to connect to the frequency converter (7).

5. The dry burning resistant brake resistor according to claim 4, characterized in that: The mounting tube (2) is arranged to extend in a bent manner.

6. The dry-burning resistant brake resistor according to claim 5, characterized in that: The two connectors (11) face the same direction; and the two wiring terminals (52) are arranged on the same side wall of the resistor cover (5).

7. The dry burning resistant brake resistor according to claim 3, characterized in that: A plurality of heat dissipation holes (53) are formed through the side wall of the resistor cover (5); one end of the heat dissipation hole (53) is connected to the installation cavity (51), and the other end is connected to the outside.

8. A rack and pinion elevator control system, characterized in that: It comprises a power module (6), a frequency converter (7), a motor (8) and a plurality of brake resistors according to any one of claims 1 to 7; the plurality of brake resistors are connected to the frequency converter (7); the signal output end of the power module (6) is communicatively connected to the signal input end of the frequency converter (7); the signal output end of the frequency converter (7) is communicatively connected to the signal input end of the motor (8); a switch component (9) is connected in series between the signal output end of the frequency converter (7) and the motor (8), and the switch component (9) is used to control the start and stop of the motor (8).

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