Floor type frequency conversion cabinet

Abstract

The utility model relates to the technical field of motor frequency conversion control of ventilation and air conditioning systems, and discloses a floor type frequency conversion cabinet which comprises a frequency conversion cabinet body, a cabinet door is assembled on the front end face of the frequency conversion cabinet body, and a frequency converter is assembled in the frequency conversion cabinet body. According to the utility model, by providing the power frequency loop and the frequency conversion loop, the reliability of the frequency conversion cabinet for controlling the motor is improved, by setting the parameters of the frequency converter, when the frequency converter fails, the frequency converter can establish communication with the control module through the MODBUS RTU protocol to realize data interaction of information of the frequency converter, and in a daily use scene, the frequency conversion cabinet can be used for controlling the motor. In such a rail transit industry or a building control industry, a fire-fighting host or an environment control center in a region sends a signal of an accident condition to a control module of a frequency conversion cabinet in a more stable form of a hard wire, and the control module controls the closing and opening of a related relay after receiving the accident signal so as to switch the accident signal into a power frequency loop. And normal operation of field equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the motor frequency control technical field of ventilation air conditioning system, concretely is a floor type frequency conversion cabinet. BACKGROUND

[0002] The motor frequency control of ventilation air conditioning system is a kind of technology that controls the air volume and temperature by adjusting motor speed, can automatically adjust the speed of motor according to actual needs, to realize the accurate control of air volume and temperature, improve the energy efficiency and comfort of system, frequency control refers to the control of motor by changing the frequency of power supply voltage;

[0003] In order to facilitate the completion of this kind of frequency conversion control, frequency conversion cabinet will be needed to complete the work, frequency conversion cabinet is the control cabinet of power device driven by frequency converter, and in actual use process, the equipment downtime caused by frequency converter failure is prone to occur, in addition, when frequency converter cannot receive frequency command under accident condition, fan speed cannot reach design requirement, which affects single frequency loop control. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a floor type frequency conversion cabinet to solve the problem of equipment downtime caused by frequency converter failure in actual use process in the above background technology, in addition, when frequency converter cannot receive frequency command under accident condition, fan speed cannot reach design requirement, which affects single frequency loop control.

[0005] To achieve the above object, the utility model provides the following technical scheme: a floor type frequency conversion cabinet, including frequency conversion cabinet cabinet body, the front end surface of frequency conversion cabinet cabinet body is equipped with cabinet door, and the control lamp is equipped on the cabinet door, the control lamp is equipped with the control knob below, the back end surface of frequency conversion cabinet cabinet body is equipped with cooling fan, and the power supply main part is equipped in the frequency conversion cabinet cabinet body, and the line is connected on the power supply main part, and the repair lighting module is connected in the line in the frequency conversion cabinet cabinet body, and the frequency converter is equipped in the frequency conversion cabinet cabinet body.

[0006] Preferably, the control lamp is evenly distributed on the cabinet door, and the control knob is evenly distributed on the cabinet door.

[0007] Preferably, the cabinet door is equipped with a cooling grid at the upper and lower positions, and the cooling grids are symmetrically distributed about the central axis of the frequency conversion cabinet cabinet body.

[0008] Preferably, the power supply main part has three phase lines, and the voltage of the three phase lines is 380V.

[0009] Preferably, the frequency conversion cabinet cabinet body is further equipped with a circuit breaker, and a fuse area is equipped above the circuit breaker in the frequency conversion cabinet cabinet body, and a relay area is provided on the side of the fuse area.

[0010] Preferably, the variable frequency cabinet body is equipped with a forward rotation AC contactor, and the variable frequency cabinet body is equipped with a reverse rotation AC contactor.

[0011] Preferably, the normally closed contact of the forward rotation AC contactor is connected in series in the coil loop of the reverse rotation AC contactor, and the normally closed contact of the reverse rotation AC contactor is connected in series in the coil loop of the forward rotation AC contactor.

[0012] Preferably, a control module is arranged on the line, and the control module can control the attraction and disconnection of the relay area.

[0013] Compared with the prior art, the floor type variable frequency cabinet has the advantages that the floor type variable frequency cabinet improves the reliability of the variable frequency cabinet for motor control and the adaptability of the working condition of the floor type variable frequency cabinet.

[0014] (1) By providing a power frequency loop and a variable frequency loop, the double-loop mode improves the reliability of the variable frequency cabinet for motor control. By setting the parameters of the frequency converter, the frequency converter can send a fault signal to the control module (such as PLC) through auxiliary contacts or communication mode when the frequency converter fails, so as to determine the fault state of the frequency converter. The frequency converter establishes communication with the control module through the MODBUS RTU protocol to realize data interaction of its own information. In the daily use scene, such as the rail transit industry or the building control industry, the fan needs to bear the work of smoke exhaust in the accident working condition (such as fire) in addition to the daily ventilation function. When bearing the work of smoke exhaust, the equipment is generally required to operate at full load. On this basis, considering the abnormal situation that may exist on the scene when an accident occurs, the signal of the accident working condition is sent to the control module of the variable frequency cabinet by the regional fire host or the environmental control center through the hard-wired mode which is more stable. When the control module receives the accident signal, the attraction and disconnection of the related relay are controlled, so that the working condition is switched to the power frequency loop, and the normal operation of the on-site equipment is ensured.

[0015] (2) By increasing the control module, the frequency converter information is collected through the control module under the premise of little change to the internal loop. When the frequency converter is normal, the frequency converter is used to control the motor to operate. When the frequency converter fails, the working condition is automatically switched to the power frequency loop to ensure the operation state of the on-site fan. When an abnormal working condition such as fire occurs, the working condition is automatically switched to the power frequency loop to ensure the effects of smoke exhaust and air supply of the fan, and the adaptability of the variable frequency cabinet to different working conditions is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model;

[0017] Figure 2 It is a front view structural schematic diagram of the utility model;

[0018] Figure 3 It is the structure schematic diagram of frequency converter wiring diagram of the utility model.

[0019] Figure 4 It is the structure schematic diagram of control principle diagram of the utility model.

[0020] In the drawing: 1, frequency conversion cabinet body; 2, heat dissipation grid; 3, control lamp; 4, regulation knob; 5, power main body; 6, relay area; 7, fuse area; 8, circuit breaker; 9, heat dissipation fan; 10, frequency converter; 11, maintenance lighting module. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0022] Please refer to Figures 1-4 The utility model provides an embodiment: a floor type frequency conversion cabinet, including frequency conversion cabinet body 1, the front end surface of frequency conversion cabinet body 1 is assembled with cabinet door, and the cabinet door is assembled with control lamp 3, and the lower portion of control lamp 3 is equipped with regulation knob 4, and the back end surface of frequency conversion cabinet body 1 is assembled with heat dissipation fan 9, and power main body 5 is assembled in frequency conversion cabinet body 1, and the line is connected on power main body 5, and the maintenance lighting module 11 is connected in the line in frequency conversion cabinet body 1, and frequency converter 10 is assembled in frequency conversion cabinet body 1.

[0023] Control lamp 3 is evenly distributed on the cabinet door, and regulation knob 4 is evenly distributed on the cabinet door.

[0024] The upper and lower positions of the cabinet door are both assembled with heat dissipation grid 2, and the heat dissipation grid 2 is symmetrically distributed about the central axis of frequency conversion cabinet body 1.

[0025] Power main body 5 has three phase lines, and the voltage of the three phase lines is all 380V.

[0026] The circuit breaker 8 is also assembled in frequency conversion cabinet body 1, and the fuse area 7 is assembled at the position above the circuit breaker 8 in frequency conversion cabinet body 1, and the side of the fuse area 7 is equipped with relay area 6.

[0027] The forward rotation ac contactor is assembled in frequency conversion cabinet body 1, and the reverse rotation ac contactor is assembled in frequency conversion cabinet body 1.

[0028] The normally closed contact of the forward rotation AC contactor is connected in series in the coil circuit of the reverse rotation AC contactor, and the normally closed contact of the reverse rotation AC contactor is connected in series in the coil circuit of the forward rotation AC contactor.

[0029] A control module is installed on the circuit, which can control the attraction and disconnection of the relay 6;

[0030] Further switching of the working frequency circuit is usually in the following forms:

[0031] First, manually rotate the working frequency switching knob. The switching knob is connected to the control unit in the frequency conversion cabinet. When the state of the knob is switched, the control unit receives the switching signal, which will control the corresponding output contact through logical judgment, thereby switching the working frequency circuit.

[0032] Second, the frequency converter 10 fault signal is connected to the control unit in the frequency conversion cabinet. When the frequency converter 10 fault signal is triggered, the control unit receives the switching signal, which will control the corresponding output contact through logical judgment, thereby switching the working frequency circuit.

[0033] Third, the accident working condition state signal is connected to the control unit in the frequency conversion cabinet. When the accident working condition state signal is triggered, the control unit receives the switching signal, which will control the corresponding output contact through logical judgment, thereby switching the working frequency circuit.

[0034] In addition to the above three ways, a variety of triggering methods can be added according to the specific requirements of the scene, such as: on-site touch screen button, upper computer picture, communication control, etc., which has good expansibility.

[0035] Working principle: First, provide the working frequency circuit and the frequency conversion circuit, and the dual-circuit mode improves the reliability of the frequency conversion cabinet for motor control. Through the parameter setting of the frequency converter 10, the fault signal of the frequency converter 10 can be sent to the control module (such as PLC) through the auxiliary contact or communication mode of the frequency converter 10 when the frequency converter 10 fails, to realize the judgment of the fault state of the frequency converter 10. The frequency converter 10 establishes communication with the control module to realize data interaction of its own information. In daily use scenarios such as rail transit industry or building control industry, the regional fire host or environmental control center sends the accident condition signal to the control module of the frequency conversion cabinet through hard-wire, which is a more stable form. When the control module receives the accident signal, it will control the attraction and disconnection of the related relay 6, so as to switch to the working frequency circuit and ensure the normal operation of the on-site equipment.

[0036] In the description of the utility model, it is to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A floor standing variable frequency cabinet, comprising a variable frequency cabinet body (1), characterized in that: The front end face of the frequency conversion cabinet cabinet (1) is equipped with a cabinet door, and the cabinet door is equipped with a control lamp (3), and the lower side of the control lamp (3) is provided with a control knob (4), the back end face of the frequency conversion cabinet cabinet (1) is equipped with a cooling fan (9), the frequency conversion cabinet cabinet (1) is equipped with a power supply body (5), the power supply body (5) is connected with a line, the line in the frequency conversion cabinet cabinet (1) is connected with a maintenance lighting module (11), the frequency conversion cabinet cabinet (1) is equipped with a frequency converter (10), the frequency conversion cabinet cabinet (1) is equipped with a forward rotation AC contactor, the frequency conversion cabinet cabinet (1) is equipped with a reverse rotation AC contactor, the normally closed contact of the forward rotation AC contactor is connected in series in the coil loop of the reverse rotation AC contactor, the normally closed contact of the reverse rotation AC contactor is connected in series in the coil loop of the forward rotation AC contactor, and a control module is arranged on the line, which can control the attraction and disconnection of the relay area (6).

2. The floor standing variable frequency cabinet according to claim 1, characterized in that: The control lamp (3) is uniformly distributed on the cabinet door, and the control knob (4) is uniformly distributed on the cabinet door.

3. The floor standing variable frequency cabinet according to claim 1, characterized in that: The upper and lower positions of the cabinet door are both equipped with a heat dissipation grid (2), and the heat dissipation grid (2) is symmetrically distributed about the central axis of the frequency conversion cabinet cabinet (1).

4. The floor standing variable frequency cabinet according to claim 1, characterized in that: The power supply body (5) has three phase lines, and the voltage of the three phase lines is all 380V.

5. The floor standing variable frequency cabinet according to claim 1, characterized in that: The frequency conversion cabinet cabinet (1) is also equipped with a circuit breaker (8), and the frequency conversion cabinet cabinet (1) is equipped with a fuse area (7) above the circuit breaker (8), and the side of the fuse area (7) is provided with a relay area (6).

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