Bypass assembly and bypass cabinet

Abstract

The utility model discloses a bypass assembly and a bypass cabinet. The bypass cabinet comprises a first contactor, a second contactor, a third contactor, a first isolation switch and a second isolation switch. The first contactor and the first isolating switch are transversely arranged side by side, the second contactor and the third contactor are transversely arranged side by side and are arranged on the lower sides of the first contactor and the first isolating switch, and the second isolating switch is arranged on one side, deviating from the first contactor and the first isolating switch, of the second contactor and the third contactor. According to the above arrangement structure, two adjacent contactors or isolation switches are connected through the plurality of conductive connection parts so as to meet the requirements of two working conditions for power supply of the motor, and two ends of each conductive connection part are respectively connected with two adjacent switch elements without crossing a plurality of switch elements for connection. Therefore, the length of the conductive connecting part which is integrally used is relatively short, so that the problems of unreasonable layout, disordered wiring and waste of connecting copper bars of the existing bypass cabinet are solved.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a bypass component and a bypass cabinet. Background Art

[0002] With the continuous development of frequency conversion technology, the long-term standby reliability of frequency converters has been greatly improved. However, for some special industries, motors need to work continuously. How to avoid accidents caused by frequency converter failures and improve the operating reliability of uninterrupted motors has become the most important consideration for the coal mining and chemical industries. For this reason, in addition to selecting frequency converter products with high reliability, bypass cabinets are also required. Compared with manual bypass cabinets, automatic bypass cabinets can perform fault repairs and normal maintenance on frequency converters without stopping the motor. Utility Model Content

[0003] The main purpose of the utility model is to provide a bypass component and a bypass cabinet, aiming to solve the problems of unreasonable layout of the existing bypass cabinet, messy wiring and waste of connecting copper bars.

[0004] In order to achieve the above-mentioned object, the utility model provides a bypass assembly, which includes a plurality of contactors, a plurality of isolating switches and a plurality of conductive connecting parts;

[0005] The plurality of contactors include a first contactor, a second contactor and a third contactor, and the plurality of isolating switches include a first isolating switch and a second isolating switch;

[0006] The first contactor and the first isolating switch are arranged side by side in the transverse direction, the second contactor and the third contactor are arranged side by side in the transverse direction and are arranged at the lower side of the first contactor and the first isolating switch, and the second isolating switch is arranged at a side of the second contactor and the third contactor away from the first contactor and the first isolating switch;

[0007] The output end of the first contactor is used to be connected to the input end of the frequency converter, the input end of the first contactor is connected to the output end of the first isolating switch through a conductive connecting portion, the input end of the first isolating switch is connected to a power supply through a conductive connecting portion, and is connected to the input end of the third contactor through another conductive connecting portion, the output end of the third contactor is connected to the output end of the second contactor through a conductive connecting portion, and is used to be connected to the motor, the input end of the second contactor is connected to the output end of the second isolating switch, and the input end of the second isolating switch is used to be connected to the output end of the frequency converter.

[0008] Optionally, the input end of the first contactor is located on the upper side of the main body of the first contactor, and the output end of the first isolating switch is located on the upper side of the main body of the first isolating switch;

[0009] The input end of the first isolating switch is located on one side of the main body of the first isolating switch in the lateral direction and is arranged away from the first contactor, and the input end of the third contactor is located on one side of the main body of the third contactor in the lateral direction and is arranged away from the second contactor;

[0010] The output end of the third contactor is located on the upper side of the body of the third contactor, and the output end of the second contactor is located on the upper side of the body of the second contactor.

[0011] Optionally, the input end of the second contactor is located on one side of the body of the second contactor in the lateral direction and is arranged away from the third contactor, and the output end of the second isolating switch is located on one side of the body of the second isolating switch in the lateral direction;

[0012] The bypass assembly further includes a flexible cable, which connects an input end of the second contactor and an output end of the second isolating switch.

[0013] Optionally, the second contactor and the third contactor both have a closed state and an open state;

[0014] The bypass assembly further includes a mechanical interlock, and the mechanical interlock is used to switch the other of the second contactor and the third contactor to the open state when one of the second contactor and the third contactor is in the closed state.

[0015] The utility model also provides a bypass cabinet, the bypass cabinet comprising:

[0016] A cabinet body is formed with a mounting cavity;

[0017] a bypass assembly, disposed in the mounting cavity; and

[0018] a plurality of mounting beams fixedly connected to the inner wall of the mounting cavity, the first contactor, the second contactor, the third contactor, the first isolating switch and the second isolating switch being respectively arranged on the plurality of mounting beams;

[0019] Wherein, the bypass assembly includes a plurality of contactors, a plurality of isolating switches and a plurality of conductive connecting parts;

[0020] The plurality of contactors include a first contactor, a second contactor and a third contactor, and the plurality of isolating switches include a first isolating switch and a second isolating switch;

[0021] The first contactor and the first isolating switch are arranged side by side in the transverse direction, the second contactor and the third contactor are arranged side by side in the transverse direction and are arranged at the lower side of the first contactor and the first isolating switch, and the second isolating switch is arranged at a side of the second contactor and the third contactor away from the first contactor and the first isolating switch;

[0022] The output end of the first contactor is used to be connected to the input end of the frequency converter, the input end of the first contactor is connected to the output end of the first isolating switch through a conductive connecting portion, the input end of the first isolating switch is connected to a power supply through a conductive connecting portion, and is connected to the input end of the third contactor through another conductive connecting portion, the output end of the third contactor is connected to the output end of the second contactor through a conductive connecting portion, and is used to be connected to the motor, the input end of the second contactor is connected to the output end of the second isolating switch, and the input end of the second isolating switch is used to be connected to the output end of the frequency converter.

[0023] Optionally, the installation cavity is provided with an opening on a side in the lateral direction close to the first isolating switch;

[0024] The first isolating switch has a first knife rotatably mounted on the input end of the first isolating switch, and the first knife is configured so that the free end of the first knife can approach or move away from the opening during its rotation stroke to turn on or off the first isolating switch.

[0025] Optionally, the second isolating switch has a second knife switch rotatably mounted on the input end of the second isolating switch, the second knife switch is used to connect and disconnect the output end of the second isolating switch during its rotational stroke, and the free end of the second knife switch can approach and move away from the bottom wall of the mounting cavity during its rotational stroke.

[0026] Optionally, the bypass cabinet further includes an insulating plate arranged on the bottom wall of the installation cavity.

[0027] Optionally, the multiple conductive connection parts also include an outgoing metal conductive bar and a first connecting metal conductive bar, the outgoing metal conductive bar is located between the first contactor and the second contactor, and the outgoing metal conductive bar is provided with two groups of connecting terminals, one group of the connecting terminals is used to connect to a power supply, and the other group of the connecting terminals is connected to the input end of the first isolating switch through the first connecting metal conductive bar.

[0028] Optionally, the outgoing metal conductive bar, the first contactor and the first isolating switch are sequentially spaced and fixedly connected to the first crossbeam in the transverse direction;

[0029] The plurality of mounting beams include a first horizontal beam extending in a transverse direction, the first connecting metal conductive bar includes a connecting section extending in a transverse direction and two mounting sections provided at two ends of the connecting section and extending in an up-down direction, one of the mounting sections is connected to the outgoing metal conductive bar, the other of the mounting sections is connected to the first disconnector, and the connecting section is located below the first horizontal beam;

[0030] The bypass cabinet also includes an insulator arranged between the outgoing metal conductive bar and the first disconnector, the upper end of the insulator is fixedly connected to the first crossbeam, and the lower end of the insulator is fixedly connected to the middle of the first connecting metal conductive bar.

[0031] In the technical solution provided by the utility model, the power supply supplies power to the motor, and two circuits arranged in parallel are arranged on the circuit connecting the power supply and the motor. When the motor is in normal working state, it needs to be supplied with variable frequency power through the frequency converter, then the first isolating switch, the first contactor, the second isolating switch and the second contactor arranged on the circuit connecting the power supply and the frequency converter, and the frequency converter and the motor can be closed and connected, and the third contactor can be disconnected; and when the frequency converter fails or needs to be repaired, at least one of the first isolating switch, the first contactor, the second isolating switch and the second contactor can be switched to the disconnected state, and the third contactor arranged on the power supply and the motor circuit can be closed and connected, so as to realize fault repair and normal maintenance of the frequency converter without stopping the motor, and the first contactor can be closed and connected. The second contactor and the first isolating switch are arranged side by side in the horizontal direction, the second contactor and the third contactor are arranged side by side in the horizontal direction, and are arranged on the side where the first contactor and the first isolating switch are upward and downward, and the second isolating switch is arranged on the side of the second contactor and the third contactor away from the first contactor and the first isolating switch. According to the above-mentioned arrangement structure, the two adjacent contactors or isolating switches are connected through multiple conductive connecting parts, so that the power supply requirements of the motor under two working conditions can be met. The two ends of each conductive connecting part are respectively connected to two adjacent switching elements with the shortest distance, and there is no need to cross multiple switching elements for connection, so that the length of the conductive connecting part used as a whole is shorter, so as to solve the problems of unreasonable layout of the existing bypass cabinet, messy wiring and waste of connecting copper bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a front schematic diagram of an embodiment of a bypass cabinet in the related art;

[0034] Figure 2 for Figure 1 A schematic diagram of a circuit of a bypass component in FIG.

[0035] Figure 3 A schematic diagram of the internal structure of a bypass cabinet according to an embodiment of the present invention;

[0036] Figure 4 for Figure 3 Circuit diagram of the bypass component in .

[0037] Description of Figure Numbers:

[0038]

[0039]

[0040] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0044] With the continuous development of frequency conversion technology, the long-term standby reliability of frequency converters has been greatly improved. However, for some special industries, motors need to work continuously. How to avoid accidents caused by frequency converter failures and improve the operating reliability of uninterrupted motors has become the most important consideration for the coal mining and chemical industries. For this reason, in addition to selecting frequency converter products with high reliability, bypass cabinets are also required. Compared with manual bypass cabinets, automatic bypass cabinets can perform fault repairs and normal maintenance on frequency converters without stopping the motor.

[0045] Please refer to the attached figure in the instruction manual. Figure 1 and Figure 2 , Figure 1 It is a front schematic diagram of an embodiment of a bypass cabinet in the related art; Figure 2 for Figure 1 Circuit diagram of the bypass component in the existing automatic bypass cabinet; the existing automatic bypass cabinet has many electrical components and unreasonable layout, resulting in messy wiring, waste of copper bars, and restricted inlet and outlet lines.

[0046] Specifically, in Figure 2 In the circuit layout diagram shown, the first contactor, the first isolating switch, the second contactor and the second isolating switch are all arranged in the up-down direction, and the third contactor is arranged on one side of the first contactor, the first isolating switch, the second contactor and the second isolating switch in the horizontal direction. Then, the length of the copper busbar required when the input end of the third contactor is connected to the power supply and the output end of the third contactor is connected to the motor needs to span the length and width of multiple switching elements, and the length of the copper busbar is relatively long.

[0047] In order to solve the above problems, the utility model provides a bypass component. Figure 3 A schematic diagram of the internal structure of a bypass cabinet according to an embodiment of the present invention; Figure 4 for Figure 3 Circuit diagram of the bypass component in .

[0048] See also Figure 3 to Figure 4 The bypass assembly includes a plurality of contactors, a plurality of isolating switches and a plurality of conductive connecting parts 40; the plurality of contactors include a first contactor KM1, a second contactor KM2 and a third contactor KM3, and the plurality of isolating switches include a first isolating switch QS1 and a second isolating switch QS2; the first contactor KM1 and the first isolating switch QS1 are arranged side by side in the transverse direction, the second contactor KM2 and the third contactor KM3 are arranged side by side in the transverse direction and are arranged on the lower side of the first contactor KM1 and the first isolating switch QS1, and the second isolating switch QS2 is arranged on the side of the second contactor KM2 and the third contactor KM3 away from the first contactor KM1 and the first isolating switch QS1; The output end of the first contactor KM1 is used to be connected to the input end of the frequency converter. The input end of the first contactor KM1 is connected to the output end of the first isolating switch QS1 through a conductive connecting part 40. The input end of the first isolating switch QS1 is connected to a power supply through a conductive connecting part 40, and is connected to the input end of the third contactor KM3 through another conductive connecting part 40. The output end of the third contactor KM3 is connected to the output end of the second contactor KM2 through a conductive connecting part 40, and is used to be connected to the motor. The input end of the second contactor KM2 is connected to the output end of the second isolating switch QS2, and the input end of the second isolating switch QS2 is used to be connected to the output end of the frequency converter.

[0049] It can be understood that when the motor is running at variable frequency, the first isolating switch QS1 and the second isolating switch QS2 are closed, the first contactor KM1 and the second contactor KM2 are closed, and the third contactor KM3 is opened.

[0050] When the frequency converter fails, the second contactor KM2 automatically opens and the third contactor KM3 automatically closes, thereby switching the motor frequency from the inverter to the industrial frequency.

[0051] When the frequency converter is under maintenance, the third contactor KM3 is closed, the second contactor KM2 is opened, the first contactor KM1 is opened, the first isolating switch QS1 and the second isolating switch QS2 are opened.

[0052] It should be noted that the power supply refers to industrial frequency electricity. Generally, industrial frequency electricity refers to the standard AC power used in industrial and household electricity, and its frequency is usually 50 Hz or 60 Hz. That is, when the motor is directly connected to the industrial frequency electricity, the motor works at a fixed speed and output power. Because the frequency converter is a device used to control the speed and output power of the motor, the running speed of the motor is adjusted by changing the frequency and voltage of the power supply. The use of the frequency converter can realize the functions of motor speed regulation, start, stop and protection, improve the running efficiency of the motor and the control performance of the system. Therefore, under the actual normal working state of the motor, it is necessary to provide a variable frequency power supply through the frequency converter, accurately adjust the running speed of the motor to the required range, and adjust the output power of the motor in real time according to the load change to improve the energy efficiency of the system. Because the frequency converter works for a long time, when it needs to be repaired and maintained, the motor needs to continue to work, so the motor can be directly connected to the industrial frequency electricity.

[0053] It is understandable that in the frequency conversion circuit, the input end of the frequency converter is usually connected to the power supply, and the connection and disconnection of the power supply are controlled by the contactor. The contactor can turn on or off the input of the power supply through a control signal, such as a button, a switch or an automatic control device. This makes it easy to control the power supply status of the power supply and start and stop the operation of the frequency converter. The output end of the frequency converter is usually connected to the motor or other load equipment. The contactor connects the output of the frequency converter to the load equipment through the contactor, and the contactor can realize the start, stop and protection functions of the motor. When the contactor is closed, the power can be passed to the motor to enable it to operate normally. When the contactor is opened, the power is disconnected from the motor to stop the motor.

[0054] It is understandable that an isolating switch is provided before the contactor at the input end of the frequency converter. The isolating switch is used to cut off the electrical connection between the power supply and the frequency converter, and completely isolate the power supply from the frequency converter to ensure safe operation during maintenance, overhaul or emergency. When the frequency converter needs to be overhauled, maintained or replaced, the power supply to the frequency converter can be cut off by closing the isolating switch to avoid danger to the staff from the power supply voltage. And when the frequency converter fails or the power supply is abnormal, the power supply can also be quickly cut off by closing the isolating switch to protect the frequency converter and other equipment from potential electrical failures.

[0055] It should be noted that in the solution of the present application, the contactor can provide overload protection. When the motor or load device is overloaded, the contactor can automatically disconnect the circuit to avoid damage or failure of the equipment. Although the provision of the contactor can add a layer of safety protection in the control circuit of the inverter, the inverter can be easily started and stopped by providing an isolating switch. Compared with directly operating the contactor or disconnecting the power supply, the isolating switch can more conveniently cut off or restore the power supply, and can also avoid affecting other devices or systems due to misoperation.

[0056] In the technical solution provided by the utility model, a power supply supplies power to the motor, and two circuits arranged in parallel are arranged on the circuit connecting the power supply and the motor. When the motor is in normal working state, it needs to be supplied with variable frequency power through the frequency converter, and the first isolating switch QS1, the first contactor KM1, the second isolating switch QS2 and the second contactor KM2 arranged on the circuit connecting the power supply and the frequency converter and the frequency converter and the motor can be closed and connected, and the third contactor KM3 can be disconnected; and when the frequency converter fails or needs to be repaired, at least one of the first isolating switch QS1, the first contactor KM1, the second isolating switch QS2 and the second contactor KM2 can be switched to the disconnected state, and the third contactor KM3 arranged on the power supply and the motor circuit can be closed and connected, so as to realize fault repair and normal maintenance of the frequency converter without stopping the motor, and the first contactor KM1 and the The first isolating switch QS1 is arranged side by side in the horizontal direction, the second contactor KM2 and the third contactor KM3 are arranged side by side in the horizontal direction, and are arranged on the side where the first contactor KM1 and the first isolating switch QS1 are upward and downward, and the second isolating switch QS2 is arranged on the side of the second contactor KM2 and the third contactor KM3 away from the first contactor KM1 and the first isolating switch QS1. According to the above-mentioned arrangement structure, two adjacent contactors or isolating switches are connected through multiple conductive connecting parts 40, so that the power supply requirements of the motor under two working conditions can be met. The two ends of each conductive connecting part 40 are respectively connected to two adjacent switching elements with the shortest distance, and there is no need to cross multiple switching elements for connection, so that the length of the conductive connecting part 40 used as a whole is shorter, so as to solve the problem of unreasonable layout of the existing bypass cabinet 100, messy wiring and waste of connecting copper busbars.

[0057] It is understandable that the wire connection part 40 is generally configured as a metal conductive device, such as a copper busbar, or a conductive connection busbar such as a copper-nickel alloy or a copper-aluminum alloy, etc. The specific design can be based on actual conditions, and the embodiments of this specification do not limit this.

[0058] Specifically, in the present embodiment, the input end of the first contactor KM1 is located on the upper side of the main body of the first contactor KM1, and the output end of the first isolating switch QS1 is located on the upper side of the main body of the first isolating switch QS1; thus, it is only necessary to set the length of the conductive connection portion 40 connecting the first isolating switch QS1 and the first contactor KM1 to the straight-line distance in the horizontal direction between the input end of the first contactor KM1 and the output end of the first isolating switch QS1.

[0059] Specifically, in this embodiment, the input end of the first isolating switch QS1 is located on one side of the main body of the first isolating switch QS1 in the lateral direction, and is disposed away from the first contactor KM1 in the lateral direction, and the input end of the third contactor KM3 is located on one side of the main body of the third contactor KM3 in the lateral direction, and is disposed away from the second contactor KM2 in the lateral direction. In this way, it is only necessary to set the length of the conductive connection portion 40 connecting the first isolating switch QS1 and the third contactor KM3 to be substantially the straight-line distance between the input end of the third contactor KM3 and the input end of the first isolating switch QS1 in the vertical direction.

[0060] Specifically, in this embodiment, the output end of the third contactor KM3 is located on the upper side of the body of the third contactor KM3, and the output end of the second contactor KM2 is located on the upper side of the body of the second contactor KM2. In this way, it is only necessary to set the length of the conductive connection portion 40 connecting the second contactor KM2 and the third contactor KM3 to be substantially the linear distance between the output end of the third contactor KM3 and the output end of the second contactor KM2 in the horizontal direction.

[0061] In this way, the length of each of the conductive connection parts 40 can reach the shortest dimension, so that the overall length of the plurality of conductive connection parts 40 can achieve the shortest length, thereby further reducing the cost.

[0062] Specifically, in the actual bypass cabinet 100, the space where the input end of the second contactor KM2 and the output end of the second isolating switch QS2 are connected is relatively complex, and there are other electrical components, which makes it inconvenient to arrange the conductive connection part 40. In order to connect the input end of the second contactor KM2 and the output end of the second isolating switch QS2, in this embodiment, the input end of the second contactor KM2 is located on one side of the body of the second contactor KM2 in the horizontal direction, and is arranged away from the third contactor KM3, and the output end of the second isolating switch QS2 is located on one side of the body of the second isolating switch QS2 in the horizontal direction. In this way, the input end of the second contactor KM2 and the output end of the second isolating switch QS2 are arranged on the same side, and no matter what kind of connecting and conducting component is used, the distance can be set shorter. In this embodiment, the bypass assembly also includes a flexible cable 1, and the flexible cable 1 connects the input end of the second contactor KM2 and the output end of the second isolating switch QS2. In this way, by setting the flexible cable 1, it can be bent and arranged as needed to adapt to different installation environments and space restrictions. Compared with the rigidity and non-bending nature of copper busbar connections, it has better performance in flexibility, scalability, maintenance and disassembly.

[0063] In this embodiment, the second contactor KM2 and the third contactor KM3 both have a closed state and an open state; when the contactor is in the closed state, the circuit path between the contacts is connected, and current can flow through the contactor, making the circuit in a closed state; when the contactor is open, the circuit is disconnected.

[0064] Further, the bypass assembly further includes a mechanical interlock 2, and when one of the second contactor KM2 and the third contactor KM3 is in the closed state, the mechanical interlock 2 switches the other of the second contactor KM2 and the third contactor KM3 to the open state, so that the second contactor KM2 and the third contactor KM3 can be prevented from switching to the closed state at the same time. It can be understood that the mechanical interlock 2 is usually implemented in a physical or mechanical manner, such as by connecting and operating with devices such as cams, pins, and push rods. The function of the mechanical interlock 2 is to design and install a mechanical connection device so that an interlocking relationship exists between the second contactor KM2 and the third contactor KM3, that is, when one party is closed, the other party must be in the open state, and they cannot be closed at the same time, thereby preventing the second contactor KM2 and the third contactor KM3 from closing at the same time, causing a substantial increase in current in a short period of time, causing a circuit short circuit fault, exceeding the rated load capacity of the equipment, causing an equipment overload fault, and possibly causing misoperation, causing the circuit to start at an inappropriate time or condition.

[0065] The utility model also provides a bypass cabinet 100, which includes the above-mentioned bypass component. Since the bypass cabinet 100 includes the bypass component, the specific structure of the bypass component refers to the above-mentioned embodiment. Since the bypass component of the bypass cabinet 100 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0066] In this embodiment, the bypass cabinet 100 also includes a cabinet body 10 and a plurality of mounting beams 20, the cabinet body 10 forms a mounting cavity; the plurality of mounting beams 20 are fixedly connected to the inner wall of the mounting cavity, and the first contactor KM1, the second contactor KM2, the third contactor KM3, the first isolating switch QS1 and the second isolating switch QS2 are separately arranged on the plurality of mounting beams 20.

[0067] Specifically, the multiple mounting beams 20 include an upper horizontal beam, an upper vertical beam, and a lower horizontal beam. The first contactor KM1 is fixed on the upper horizontal beam through a single contactor mounting plate, and the first isolating switch QS1 is installed at the front end of the first contactor KM1, that is, the first isolating switch QS1 is installed on the side of the opening close to the bypass cabinet 100. The multiple mounting beams 20 also include a first isolating mounting beam and a second isolating mounting beam arranged on the lower side of the first isolating mounting beam, and the first isolating switch QS1 is fixed on the upper vertical beam through the first isolating mounting beam. The second contactor KM2 and the third contactor KM3 are fixed on the double contactor mounting plate; the mechanical interlock is provided between the second contactor KM2 and the third contactor KM3. The double contactor mounting plate is fixed on the lower horizontal beam; the second isolating switch QS2 is fixed on the lower horizontal beam through the second isolating mounting beam, and is located directly below the double contactor mounting plate. An insulator is fixed under the single contactor mounting plate to fix the first isolating switch QS1 to the incoming copper busbar of the high-voltage sensor; the high-voltage sensor is fixed to the upper rear end of the frame through the sensor mounting beam, so that each switch element is fixedly installed through a corresponding mounting beam 20, and the internal space is reasonably distributed.

[0068] It should be noted that, in the present utility model, the aforementioned horizontal direction corresponds to the bypass cabinet 100, and can refer to the front end and the rear end of the bypass cabinet 100. The first contactor KM1, the second contactor KM2, the third contactor KM3, the first isolating switch QS1 and the second isolating switch QS2 are described relative to the bypass cabinet 100. The first isolating switch QS1 is arranged at the front end of the bypass cabinet 100, close to the opening, the first contactor KM1 is arranged at the rear end of the first isolating switch QS1, and the second contactor KM2 is arranged at the rear end of the third contactor KM3.

[0069] Further, in this embodiment, the installation cavity is provided with an opening on one side in the lateral direction and close to the first isolating switch QS1, and the opening is provided as a door window, so as to facilitate the installation and later maintenance of the electronic devices installed in the installation cavity, and a cabinet door is provided at the opening, which is used to open and close the opening; the first isolating switch QS1 has a first switch blade 3 rotatably installed at the input end of the first isolating switch QS1, and the first switch blade 3 is used to conduct and disconnect the output end of the first isolating switch QS1 during its rotation stroke, and the free end of the first switch blade 3 can be arranged close to and away from the opening during its rotation stroke. In this way, the operator can clearly see and touch the first switch blade 3 before entering the electrical cabinet. In this way, the operator can avoid misoperation by the operator, and a certain distance is maintained between the first switch blade 3 and the operator, reducing the risk of electric shock. When operating, the operator needs to open or close the cabinet door, and the position of the first switch blade 3 can remind the operator to keep a safe distance and avoid contact with the live parts. And the first switch blade 3 faces the opening, which can facilitate the operator to monitor the position and state of the first switch blade 3. During operation, the operator can directly observe whether the position of the first switch 3 is correct to ensure the correct switching of the circuit and the safety of operation, and it is also convenient for operation and maintenance. When maintenance or overhaul is required, the operator can directly access the first switch 3 by opening the cabinet door, which is convenient for operation and maintenance.

[0070] In this embodiment, the second isolating switch QS2 has a second knife 4 rotatably installed at the input end of the second isolating switch QS2, and the second knife 4 is used to turn on and off the output end of the second isolating switch QS2 during its rotation stroke, and the free end of the second knife 4 can approach and move away from the bottom wall of the installation cavity during its rotation stroke; similarly, directing the second knife 4 of the second isolating switch QS2 toward the door of the electrical cabinet helps to improve the safety of the operator, prevent the risk of misoperation and electric shock, and facilitate operation monitoring and maintenance work.

[0071] Since the isolating switch usually has a large creepage distance, which refers to the maximum distance between two conductive parts that can be safely in contact when the voltage increases on the insulating surface, in order to reduce or prevent the occurrence of arc and corona discharge phenomena and ensure the safe isolation of the circuit, in this embodiment, the bypass cabinet 100 also includes an insulating plate 30 arranged on the bottom wall of the installation cavity. In this way, when the second isolating switch QS2 cuts off the circuit, an arc may be generated, which will damage the surrounding insulating materials and equipment. By arranging the insulating plate 30 under the second isolating switch QS2, the arc can be prevented from propagating downward and the impact on the equipment below can be reduced. In addition, the insulating plate 30 can provide an additional insulating layer to increase the insulation distance of the bypass cabinet 100, which helps to prevent the bypass cabinet 100 from having insulation failures during operation and reduce the generation of arcs and corona. At the same time, the insulating plate 30 can also prevent external debris and moisture from entering the interior of the electrical equipment, thereby improving the insulation reliability of the equipment. The insulating plate 30 can serve as an isolation layer to isolate the area below the isolating switch from the equipment above. In this way, when maintaining and cleaning the equipment, it can be operated more conveniently, reducing the risk of electric shock to the operator. At the same time, the dirt on the insulating plate 30 can be cleaned more easily, keeping the equipment in good operating condition.

[0072] At the same time, in the related art, the second isolating switch is arranged at the rear end part of the bypass cabinet. In order to make the second isolating switch have a larger creepage distance, the space for setting the bypass cabinet needs to be larger. In this embodiment, the second isolating switch QS2 is hoisted, and the height of the entire bypass cabinet 100 can also be controlled below 2 meters, effectively reducing the volume and height of the bypass cabinet 100.

[0073] In this embodiment, the plurality of conductive connection parts 40 further include an outgoing metal conductive bar 41 and a first connecting metal conductive bar 401, the outgoing metal conductive bar 41 is located between the first contactor KM1 and the second contactor KM2, and the outgoing metal conductive bar 41 is provided with two groups of wiring terminals 411, one group of which is used to connect to the power supply, and the other group of which is connected to the input end of the first isolating switch QS1 through the first connecting metal conductive bar 401. The outgoing metal conductive bar 41 is provided with two groups of wiring terminals 411, and it can be understood that the wiring terminals 411 can be set as fixing holes. Some motor types (such as DC motors) work under forward current, while other motor types (such as AC motors) work under bidirectional current. Therefore, different types of motors may need to select a specific current transmission direction according to their working mode. In this way, a cabinet 10 of a bypass cabinet 100 can realize the upper outgoing line of the power supply and the lower outgoing line of the power supply at the same time. It should be noted that the upper outgoing line of the power supply refers to the output current of the power supply coming out from the top or top of the power supply. This means that the current is transmitted from the positive or output terminal of the power supply through the wires to the load or device; underwire means that the output current of the power supply comes out from the bottom or bottom of the power supply. This means that the current is transmitted from the negative or output terminal of the power supply through the wires to the load or device.

[0074] In this embodiment, the outgoing metal conductive bar 41, the first contactor KM1 and the first isolating switch QS1 are fixedly connected to the first crossbeam 21 in sequence in the transverse direction; the plurality of mounting beams 20 include a first crossbeam 21 extending in the transverse direction, and the first connecting metal conductive bar 401 includes a connecting section extending in the transverse direction and two mounting sections disposed at two ends of the connecting section and extending in the vertical direction, wherein one of the mounting sections is connected to the outgoing metal conductive bar 41, and the other of the mounting sections is connected to the first isolating switch QS1, and the connecting section is disposed below the first crossbeam 21. The bypass cabinet 100 also includes an insulator 50 disposed between the outgoing metal conductive bar 41 and the first isolating switch QS1, wherein the upper end of the insulator 50 is fixedly connected to the first crossbeam 21, and the lower end of the insulator 50 is fixedly connected to the middle of the first connecting metal conductive bar 401. Because the first contactor KM1 is spaced between the first isolating switch QS1 and the outgoing metal conductive bar 41, when the outgoing metal conductive bar 41 connecting a group of the connecting terminals 411 and the input end of the first isolating switch QS1 is set to have an excessive length, the insulator 50 can fix the middle part of the outgoing metal conductive bar 41 on the first crossbeam 21.

[0075] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A bypass assembly, characterized in that: It includes a plurality of contactors, a plurality of isolating switches and a plurality of conductive connecting parts; The plurality of contactors include a first contactor, a second contactor and a third contactor, and the plurality of isolating switches include a first isolating switch and a second isolating switch; The first contactor and the first isolating switch are arranged side by side in the transverse direction, the second contactor and the third contactor are arranged side by side in the transverse direction and are arranged at the lower side of the first contactor and the first isolating switch, and the second isolating switch is arranged at a side of the second contactor and the third contactor away from the first contactor and the first isolating switch; The output end of the first contactor is used to be connected to the input end of the frequency converter, the input end of the first contactor is connected to the output end of the first isolating switch through a conductive connecting portion, the input end of the first isolating switch is connected to a power supply through a conductive connecting portion, and is connected to the input end of the third contactor through another conductive connecting portion, the output end of the third contactor is connected to the output end of the second contactor through a conductive connecting portion, and is used to be connected to the motor, the input end of the second contactor is connected to the output end of the second isolating switch, and the input end of the second isolating switch is used to be connected to the output end of the frequency converter.

2. The bypass assembly according to claim 1, characterized in that The input end of the first contactor is located on the upper side of the main body of the first contactor, and the output end of the first isolating switch is located on the upper side of the main body of the first isolating switch; The input end of the first isolating switch is located on one side of the main body of the first isolating switch in the lateral direction and is arranged away from the first contactor, and the input end of the third contactor is located on one side of the main body of the third contactor in the lateral direction and is arranged away from the second contactor; The output end of the third contactor is located on the upper side of the body of the third contactor, and the output end of the second contactor is located on the upper side of the body of the second contactor.

3. The bypass assembly according to claim 1, characterized in that The input end of the second contactor is located on one side of the body of the second contactor in the lateral direction and is arranged away from the third contactor, and the output end of the second isolating switch is located on one side of the body of the second isolating switch in the lateral direction; The bypass assembly further includes a flexible cable, which connects an input end of the second contactor and an output end of the second isolating switch.

4. The bypass assembly according to claim 1, characterized in that The second contactor and the third contactor both have a closed state and an open state; The bypass assembly further includes a mechanical interlock, and the mechanical interlock is used to switch the other of the second contactor and the third contactor to the open state when one of the second contactor and the third contactor is in the closed state.

5. A bypass cabinet, characterized in that: include: A cabinet body is formed with a mounting cavity; The bypass assembly according to any one of claims 1 to 4, arranged in the mounting cavity; as well as, A plurality of mounting beams are fixedly connected to the inner wall of the mounting cavity, and the first contactor, the second contactor, the third contactor, the first isolating switch and the second isolating switch are respectively arranged on the plurality of mounting beams.

6. The bypass cabinet according to claim 5, characterized in that: The installation cavity is provided with an opening on one side thereof in the lateral direction and close to the first isolating switch; The first isolating switch has a first knife rotatably mounted on the input end of the first isolating switch, and the first knife is configured so that the free end of the first knife can approach or move away from the opening during its rotation stroke to turn on or off the first isolating switch.

7. The bypass cabinet according to claim 5, characterized in that: The second isolating switch has a second knife which is rotatably mounted on the input end of the second isolating switch. The second knife is used to connect and disconnect the output end of the second isolating switch during its rotational stroke. The free end of the second knife can approach and move away from the bottom wall of the mounting cavity during its rotational stroke.

8. The bypass cabinet according to claim 7, characterized in that: The bypass cabinet also includes an insulating plate arranged on the bottom wall of the installation cavity.

9. The bypass cabinet according to claim 5, characterized in that: The multiple conductive connection parts also include an outgoing metal conductive bar and a first connecting metal conductive bar, the outgoing metal conductive bar is located between the first contactor and the second contactor, and the outgoing metal conductive bar is provided with two groups of connecting terminals, one group of the connecting terminals is used to connect to a power supply, and the other group of the connecting terminals is connected to the input end of the first isolating switch through the first connecting metal conductive bar.

10. The bypass cabinet according to claim 9, characterized in that: The plurality of mounting beams include a first beam extending in a transverse direction, and the outgoing metal conductive bar, the first contactor and the first isolating switch are fixedly connected to the first beam in a sequentially spaced manner in the transverse direction; The first connecting metal conductive bar comprises a connecting section extending in the transverse direction and two mounting sections respectively arranged at two ends of the connecting section and extending in the vertical direction, wherein one mounting section is connected to the outgoing metal conductive bar, and the other mounting section is connected to the first disconnector, and the connecting section is arranged below the first crossbeam; The bypass cabinet also includes an insulator arranged between the outgoing metal conductive bar and the first disconnector, the upper end of the insulator is fixedly connected to the first crossbeam, and the lower end of the insulator is fixedly connected to the middle of the first connecting metal conductive bar.

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