CN215439225U - Load sharing system for escalator frequency converter - Google Patents
Load sharing system for escalator frequency converter Download PDFInfo
- Publication number
- CN215439225U CN215439225U CN202121798214.XU CN202121798214U CN215439225U CN 215439225 U CN215439225 U CN 215439225U CN 202121798214 U CN202121798214 U CN 202121798214U CN 215439225 U CN215439225 U CN 215439225U
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- China
- Prior art keywords
- escalator
- direct current
- frequency converter
- sharing system
- load sharing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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- Escalators And Moving Walkways (AREA)
Abstract
The utility model discloses a load sharing system of an escalator frequency converter, which comprises two escalators, two groups of escalator control circuits and two direct current buses for connecting the two groups of escalator control circuits, wherein the escalator control circuits correspond to the escalators one by one and are used for controlling the running states of the corresponding escalators; each group of escalator control circuits is provided with a frequency converter, each frequency converter is provided with a direct current forward port and a direct current reverse port, the direct current forward ports of the two frequency converters are connected through a direct current bus, and the direct current reverse ports of the two frequency converters are connected through another direct current bus, so that a direct current loop is formed. The utility model can effectively and conveniently save electric energy.
Description
Technical Field
The utility model relates to the technical field of escalators, in particular to a load sharing system of an escalator frequency converter.
Background
At present, the common escalator operation schemes in the market mainly comprise the following steps:
firstly, a power frequency operation scheme: the escalator consumes electricity when going upward, generates electricity when going downward (with load), but has no slow speed and has lower power factor when no load;
secondly, single frequency conversion, and preparation of a voltage resistance scheme: the escalator consumes electricity when going upward, and the heat energy emits energy when going downward (with load), but the brake generates heat;
thirdly, a single frequency conversion and energy feedback unit matching method comprises the following steps: the escalator consumes electricity when going upward, and generates electricity when going downward (with load), but has slight influence on the generation of harmonic waves and other EMC of the power grid.
Therefore, in the operation process of the ascending escalator, the motor is in an electric state; in the running process of the down escalator, the motor is in a power generation state. Accordingly, the feedback energy of the motor can be released outwards in the form of heat energy (as in the second scheme), but the feedback energy is not utilized, or the feedback energy is fed back to the power grid by using the energy feedback unit (as in the third scheme), but the investment cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a load sharing system of an escalator frequency converter with a simple structure, which can effectively and conveniently save electric energy.
In order to solve the technical problem, the utility model provides a load sharing system of an escalator frequency converter, which comprises two escalators, two groups of escalator control circuits and two direct current buses for connecting the two groups of escalator control circuits, wherein the escalator control circuits correspond to the escalators one by one and are used for controlling the running states of the corresponding escalators; each group of escalator control circuits is provided with a frequency converter, each frequency converter is provided with a direct current forward port and a direct current reverse port, the direct current forward ports of the two frequency converters are connected through a direct current bus, and the direct current reverse ports of the two frequency converters are connected through another direct current bus, so that a direct current loop is formed.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises fuses connected in series on the direct current bus, and the fuses correspond to the direct current bus one to one.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises contactors connected in series to the direct current buses, and the contactors are in one-to-one correspondence with the direct current buses.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises a direct current electric energy meter connected in series to any one of the direct current buses, and the direct current electric energy meter is used for detecting electric energy generated by the direct current loop.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises a control cabinet for loading the direct current electric energy meter, and the control cabinet is arranged in a triangular machine room or an upper machine room of any escalator control circuit.
As an improvement of the scheme, the two escalators have the same lifting height and the same power.
As an improvement of the scheme, the two frequency converters are arranged in the same machine room.
As an improvement of the scheme, each group of escalator control circuits are provided with brake resistors, and the brake resistors correspond to the frequency converters one by one; each frequency converter is provided with a resistor positive connection port and a resistor reverse connection port, one end of each brake resistor is connected with the corresponding resistor positive connection port, and the other end of each brake resistor is connected with the corresponding resistor reverse connection port.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises a controller connected with the contactor, and the controller is used for acquiring the running states of the two escalators and controlling the opening and closing states of the contactor.
As an improvement of the above scheme, the escalator frequency converter load sharing system further comprises an alarm connected with the controller.
The beneficial effects of the implementation of the utility model are as follows:
the frequency converter of the ascending escalator is connected with the frequency converter of the descending escalator through the direct current bus, so that energy generated by the motor of the descending escalator is fed back, the energy is shared by the energy of the direct current bus and enters the frequency converter of the ascending escalator, and the energy is consumed by the motor of the ascending escalator, so that the energy-saving effect is achieved. Therefore, in the running process, the electric energy generated by the load can be timely provided for the equipment needing to be powered, all the equipment generates electricity frequently and consumes electricity frequently, dynamic balance is carried out in the continuous running process, the electric energy is shared, and the electric energy is saved at the inlet wire of the main power supply;
in addition, the escalator can continuously and safely run by introducing equipment such as a brake resistor, a fuse, a contactor and the like, and contributes to the green environmental protection industry;
furthermore, the direct current electric energy meter is introduced, so that the electric quantity statistics is facilitated, and the method is ready for subsequent research.
Drawings
Fig. 1 is a schematic structural diagram of a load sharing system of an escalator frequency converter of the present invention;
fig. 2 is a schematic circuit diagram of the load sharing system of the escalator frequency converter of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, fig. 1 and 2 show a specific structure of a UF load sharing system of an escalator frequency converter of the present invention, which includes two escalators, two sets of escalator control circuits Q, and two dc buses WB for connecting the two sets of escalator control circuits Q, where the escalator control circuits Q correspond to the escalators one by one and are used to control the operating states of the corresponding escalators.
Each group of escalator control circuits Q is internally provided with a frequency converter UF, each frequency converter UF is provided with a direct current forward port DC + and a direct current reverse port DC-, the direct current forward ports DC + of the two frequency converters UF are connected through a direct current bus WB, and the direct current reverse ports DC-of the two frequency converters UF are connected through another direct current bus WB, so that a direct current loop is formed.
In the prior art, the escalators operate independently and do not influence each other. Compared with the prior art, the escalator frequency converter UF load sharing is realized through the direct current bus WB, electric energy can be balanced through frequency conversion sharing, and the voltage of the direct current bus WB can be stabilized.
As shown in fig. 1, the frequency converter UF of the escalator is connected with the frequency converter UF of the escalator through the direct-current bus WB, so that energy generated by the motor of the escalator is fed back, enters the frequency converter UF of the escalator through energy sharing of the direct-current bus WB, and is consumed through the motor of the escalator, and therefore the energy-saving effect is achieved. Therefore, the utility model can provide the electric energy generated by the load to the equipment needing power generation in time in the operation process, all the equipment generates power frequently and consumes power frequently, dynamic balance is carried out in the continuous operation, the electric energy is shared, and the electric energy is saved at the inlet wire of the main power supply.
Correspondingly, the two escalators have the same lifting height and the same power. The utility model selects 2 escalators with the same lifting height and the same power, and adopts frequency converters with the same power and the same model to carry out direct current bus connection, thereby ensuring that the electrical characteristics of the two escalators are the same, the rectification units are the same, and in addition, the power supply is from the same power grid, therefore, the voltage of the direct current bus is the same when the escalator is in no load, the current movement generated when the direct current buses are in no load due to different electrical characteristics can be avoided, and the electric energy is saved to the maximum extent.
Meanwhile, the two frequency converters are also arranged in the same machine room. It should be noted that the two escalators of the utility model adopt a parallel-stair structure, 2 frequency converters are installed in the same machine room, and the connecting line between the direct current buses is very short, so that the impact on one frequency converter caused at the moment of opening the stair can be effectively avoided, and the stability is better.
Further, each group of escalator control circuits Q is provided with a brake resistor R, and the brake resistors R correspond to the frequency converters UF one to one. Specifically, each frequency converter UF is provided with a resistor forward connection port R + and a resistor reverse connection port R-, one end of each brake resistor R is connected with the corresponding resistor forward connection port R +, and the other end of each brake resistor R is connected with the corresponding resistor reverse connection port R-.
It should be noted that, the escalator is used as a special device, and the safety performance of the escalator needs to be ensured in practical application, so that, in order to ensure that each escalator can independently operate and can share electric energy, each frequency converter UF of the present invention is provided with a brake resistor R for secondary protection, and when the voltage of the dc bus WB exceeds 780V, the brake resistor R operates to enable the output voltage of the frequency converter UF to be normal.
As shown in fig. 2, the escalator frequency converter UF load sharing system further includes fuses FU connected in series to the dc bus WB, where the fuses FU correspond to the dc bus WB in a one-to-one manner. When the current flowing through the direct current bus WB exceeds a specified value, the fuse FU is disconnected, so that the safe operation of the direct current loop is ensured.
In addition, staircase converter UF load sharing system still includes to be in tandem connection contactor K on direct current bus WB, contactor K and direct current bus WB one-to-one. In the actual operation process, the direct current loop can be switched on or switched off by controlling the contactor K, the flexibility is strong, and the controllable operation of the direct current loop can be ensured.
Therefore, the direct current loop is protected by adopting the mode of double fuses FU and double contactors K, the adhesion fault of one contactor when the escalator needs to be disconnected can be avoided, and the independent and safe operation of the escalator can be ensured.
In order to visually judge the electric energy value saved by the escalator frequency converter UF load sharing system, the escalator frequency converter UF load sharing system further comprises a direct current electric energy meter connected in series to any one direct current bus WB, and the direct current electric energy meter is used for detecting the electric energy generated by the direct current loop. According to the utility model, the direct current electric energy meter is introduced into the escalator frequency converter UF load sharing system, and when current occurs between the two frequency converters UF, the generated energy can be automatically recorded through the direct current electric energy meter, so that the saved electric energy value of the escalator can be effectively detected, the saved electric energy can be counted, and convenience is brought to the analysis of maintenance personnel.
Correspondingly, the escalator frequency converter UF load sharing system further comprises a control cabinet used for loading the direct current electric energy meter, and the control cabinet is arranged in a triangular machine room or an upper machine cabin of any escalator control circuit Q. The effective encapsulation of direct current electric energy meter can be realized through the switch board, further makes things convenient for operating personnel to look over.
Further, the escalator frequency converter UF load sharing system further comprises a controller connected with the contactor K, and the controller is used for collecting the operation states of the two escalators and controlling the opening and closing states of the contactor K according to the operation states. The controller is preferably a siemens PLC, but is not limited thereto as long as a simple logical judgment can be realized, specifically:
when the two escalators are in the frequency converter UF mode and the normal operation state, the frequency converter UF is electrified, one escalator is in an ascending state, and the other escalator is in a descending state, the controller is connected with the two contactors K on the direct current bus WB to enable the direct current loop to be conducted.
When any one of the two escalators has a fault or is abnormal and can not satisfy the execution of the common direct current bus WB scheme any more, or when any one of the two escalators is powered off or stops the escalator due to the fault, the controller immediately disconnects the direct current bus WB contactor K so as to disconnect the direct current loop.
Correspondingly, the escalator frequency converter UF load sharing system further comprises an alarm connected with the controller. When the common direct current bus WB has a fault, the frequency converter UF can send a fault signal to the two escalators through the alarm.
Therefore, the scheme for sharing the UF load of the escalator frequency converter can effectively and conveniently save electric energy, can ensure that the escalator continuously and safely operates, and contributes to the green and environmental protection industry.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model.
Claims (10)
1. The escalator frequency converter load sharing system is characterized by comprising two escalators, two sets of escalator control circuits and two direct current buses for connecting the two sets of escalator control circuits, wherein the escalator control circuits correspond to the escalators one by one and are used for controlling the running states of the corresponding escalators;
each group of escalator control circuits is provided with a frequency converter, each frequency converter is provided with a direct current forward port and a direct current reverse port, the direct current forward ports of the two frequency converters are connected through a direct current bus, and the direct current reverse ports of the two frequency converters are connected through another direct current bus, so that a direct current loop is formed.
2. The escalator frequency converter load sharing system according to claim 1, further comprising fuses connected in series to the dc bus, the fuses corresponding one-to-one to the dc bus.
3. An escalator frequency converter load sharing system according to claim 1 or 2, further comprising contactors connected in series to the dc bus bars, the contactors being in one-to-one correspondence with the dc bus bars.
4. An escalator frequency converter load sharing system as claimed in claim 1, further comprising a dc power meter connected in series to any one of said dc buses, said dc power meter being adapted to sense the power generated by said dc loop.
5. An escalator frequency converter load sharing system according to claim 4, further comprising a control cabinet for loading said DC power meter, said control cabinet being disposed in a delta room or an upper cabinet of any escalator control circuit.
6. An escalator frequency converter load sharing system as claimed in claim 1, wherein the two escalators have the same lifting height and the same power.
7. An escalator frequency converter load sharing system as claimed in claim 1, wherein both frequency converters are located in the same machine room.
8. The escalator frequency converter load sharing system according to claim 1, wherein each group of escalator control circuits is provided with a brake resistor, and the brake resistors are in one-to-one correspondence with the frequency converters;
each frequency converter is provided with a resistor positive connection port and a resistor reverse connection port, one end of each brake resistor is connected with the corresponding resistor positive connection port, and the other end of each brake resistor is connected with the corresponding resistor reverse connection port.
9. An escalator frequency converter load sharing system according to claim 3, further comprising a controller connected to said contactors for acquiring the operating conditions of said two escalators and controlling the on and off states of said contactors.
10. An escalator frequency converter load sharing system as claimed in claim 9, further comprising an alarm connected to said controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121798214.XU CN215439225U (en) | 2021-08-03 | 2021-08-03 | Load sharing system for escalator frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121798214.XU CN215439225U (en) | 2021-08-03 | 2021-08-03 | Load sharing system for escalator frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215439225U true CN215439225U (en) | 2022-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121798214.XU Expired - Fee Related CN215439225U (en) | 2021-08-03 | 2021-08-03 | Load sharing system for escalator frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215439225U (en) |
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2021
- 2021-08-03 CN CN202121798214.XU patent/CN215439225U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220107 |