Variable frequency control system for air compressor with separated installation

Abstract

The utility model belongs to the technical field of frequency conversion air compressor, specifically discloses a kind of air compressor frequency conversion control system of separation type installation, including the frequency converter control cabinet of installation in the distribution room far from air compressor and the controller in air compressor cabin, frequency converter control cabinet is equipped with the frequency converter and the control accessory connected with air compressor motor and with frequency converter, the controller is connected between frequency converter by RS485 communication module, the RS485 communication module includes the terminal interface assembly for being connected with frequency converter by data line and having the effect of preventing the end of terminal interface assembly from coming off, the utility model moves frequency converter from air compressor machine to the superior environment of substation, controller and frequency converter establish protocol using RS-485 communication module, pass through data line transmission control signal to drive frequency converter to drive motor to operate, to reach air compressor and frequency converter separation control, realize the stable operation of frequency converter.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency air compressor technology, specifically a split-installation variable frequency control system for air compressors. Background Technology

[0002] The frequency converter of a variable frequency air compressor is usually installed next to the air compressor. The frequency converter and the air compressor are integrated into a small enclosure. The frequency converter operates under high load in a confined space, with a large current and poor heat dissipation. A lot of heat generated by the air compressor head, drive motor, frequency converter and other components accumulates in the small space. The high temperature is not conducive to the normal operation of the frequency converter. Moreover, dust on site is attracted to the internal components of the frequency converter under the action of electromagnetic force, which can easily cause short circuits. During the high-speed operation of the air compressor rotor, the vibration of the casing can affect the internal wiring of the frequency converter and cause bolts to loosen. The operating environment of the frequency converter is very poor.

[0003] Currently, the typical control method for variable frequency air compressors involves integrating the frequency converter and controller into the air compressor compartment. The signal transmission distance from the controller to the frequency converter is short, eliminating concerns about signal attenuation. However, if the frequency converter is moved to a power distribution room far from the air compressor, the control signal between the controller and the frequency converter will be significantly affected, thus failing to guarantee the overall operation of the air compressor and frequency converter under remote control. Therefore, we need to propose a separately installed variable frequency control system for air compressors to solve the aforementioned problems, enabling long-distance signal transmission between the frequency converter and the controller, achieving the goal of remote, separate control of the air compressor and the frequency converter. Utility Model Content

[0004] The purpose of this utility model is to provide a separately installed variable frequency control system for air compressors, which can realize long-distance signal transmission between the frequency converter and the controller, and achieve the purpose of separate control of the air compressor and the frequency converter in different locations, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a separately installed variable frequency control system for an air compressor, comprising a variable frequency control cabinet installed in a power distribution room away from the air compressor and a controller located in the air compressor compartment. The variable frequency control cabinet is equipped with a variable frequency drive connected to the air compressor motor and control accessories connected to the variable frequency drive. The controller and the variable frequency drive are connected via an RS485 communication module. The RS485 communication module includes a terminal interface component for connecting the controller and the variable frequency drive via a data cable and having an anti-disconnection effect.

[0006] Preferably, the terminal interface assembly includes a data cable connected to the frequency converter and a female connector connected to the controller. One end of the data cable is fixed with a male connector. After the female connector and the male connector are plugged in, they are connected by an anti-disconnection mechanism, which is sleeved on the outside of the male connector and the female connector.

[0007] Preferably, the anti-detachment mechanism includes two collars that fit onto the male and female heads. Both the male and female heads are provided with protrusions for the collars to fit onto. One side of each collar is fixed with an elastic connecting rod, one end of which is fixed with a hook, and the other side of the collar is provided with a hole for the hook to attach.

[0008] Preferably, the connecting rod is located in the middle of the collar, and the connecting rods on the two collars are arranged symmetrically. When the anti-detachment mechanism is engaged with the male and female heads, the connecting rod is located at the connection point of the male and female heads.

[0009] Preferably, the connecting rod is composed of an elastic band and an acrylic plate. Two acrylic plates are fixed at both ends of the elastic band, and the two acrylic plates located at the ends of the elastic band are respectively fixed to both sides of the elastic band by adhesive.

[0010] Preferably, the control accessory includes a circuit breaker QF1 connected to the three-phase power supply and a PV multifunction meter connected to the circuit breaker QF1. Multiple fuses are also connected between the PV multifunction meter and the circuit breaker QF1. The frequency converter is connected to the PV multifunction meter and the circuit breaker QF1 through a current transformer, and a fuse is also connected between the PV multifunction meter and the frequency converter.

[0011] Preferably, the control accessory further includes an SP surge arrester and a circuit breaker QF2 connected to the SP surge arrester, with one end of the circuit breaker QF2 connected between the PV multifunction meter and the frequency converter.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model moves the frequency converter from the air compressor to a substation with a superior environment, while leaving the operating controller in the same position as the air compressor. The controller and the frequency converter establish a protocol using an RS-485 communication module and transmit control signals through a data line to drive the frequency converter to drive the motor. This achieves separate control of the air compressor and the frequency converter, and realizes the stable operation of the frequency converter.

[0014] 2. This utility model, through the setting of the terminal interface component, can connect the separate controller and the frequency converter, and by utilizing its anti-disconnection effect, it can prevent the terminals from detaching after connection, thus ensuring the stability of the connection between the frequency converter and the controller and guaranteeing the quality of communication. Attached Figure Description

[0015] Figure 1 This is a system block diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the terminal interface assembly of this utility model during connection.

[0017] Figure 3 This is an exploded view of the terminal interface assembly of this utility model;

[0018] Figure 4 This is a schematic diagram of the anti-detachment mechanism of this utility model;

[0019] Figure 5 This is a schematic diagram of the stacked structure of the connecting rod of this utility model.

[0020] In the diagram: 1. Inverter control cabinet; 2. Controller; 3. RS485 communication module; 31. Data cable; 32. Male connector; 33. Female connector; 34. Anti-detachment mechanism; 341. Collar; 342. Connecting rod; 3421. Acrylic plate; 3422. Elastic band; 343. Hook; 344. Socket. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-5 This utility model provides a technical solution: a separately installed variable frequency control system for an air compressor, including a variable frequency drive control cabinet 1 installed in a power distribution room far from the air compressor and a controller 2 located in the air compressor compartment. The variable frequency drive control cabinet 1 is equipped with a variable frequency drive connected to the air compressor motor and control accessories connected to the variable frequency drive. The controller 2 is connected to the variable frequency drive via an RS485 communication module 3. By moving the variable frequency drive from the side of the air compressor to a substation with a superior environment, the controller 2 remains in the same position as the air compressor body. The controller 2 and the variable frequency drive establish a protocol using the RS-485 communication module and transmit control signals through data line 31 to drive the variable frequency drive to run the motor, thereby achieving separate control of the air compressor and the variable frequency drive and realizing stable operation of the variable frequency drive.

[0023] The RS485 communication module 3 includes a terminal interface component for connecting the controller 2 and the frequency converter via a data cable 31 and having an anti-disconnection effect. By setting the terminal interface component, the separate controller 2 and the frequency converter can be connected, and its anti-disconnection effect can prevent the connected terminals from becoming disconnected, thus ensuring the stability of the connection between the frequency converter and the controller 2 and guaranteeing the quality of communication.

[0024] The terminal interface assembly includes a data cable 31 connected to the frequency converter and a female connector 33 connected to the controller 2. One end of the data cable 31 is fixed with a male connector 32. The female connector 33 is connected to the male connector 32 via an anti-disconnection mechanism 34. The anti-disconnection mechanism 34 is sleeved around the male connector 32 and the female connector 33, allowing for detachable connection between them. This facilitates the installation or removal of the male connector 32 and the female connector 33 according to actual usage requirements, improving ease of use. The male connector 32 and the female connector 33 are configured as corresponding male and female connectors for USB, SPI, GPIO, etc. The RS485 communication module 3 also includes an RS485 communication line and a corresponding RS485 interface, allowing selection of different interfaces for communication according to actual communication needs.

[0025] The anti-detachment mechanism 34 includes two collars 341 that fit onto the male connector 32 and the female connector 33. Both the male connector 32 and the female connector 33 have protrusions (not shown in the figure) for the collars 341 to fit onto (the protrusions are designed according to the actual interface type of the male connector 32 and the female connector 33, allowing the collars 341 to fit onto them). One side of each collar 341 is fixed with a flexible connecting rod 342, and one end of the connecting rod 342 is fixed with a hook 343. The other side of the collar 341 has a hook for the hook 343. When the male head 32 and the female head 33 are inserted into the socket 344, two collars 341 are respectively fitted onto the two sides of the male head 32 and the female head 33. Then, the hook 343 is hooked onto another collar 341, so that the end of the hook 343 is inserted into the socket 344, connecting the two collars 341 to improve the connection force between the two collars 341. By using the two collars 341 to bind the male head 32 and the female head 33, it can prevent the male head 32 and the female head 33 from separating or loosening due to external force, and improve the stability of the connection between the male head 32 and the female head 33.

[0026] The connecting rod 342 is located in the middle of the collar 341. The connecting rods 342 on the two collars 341 are arranged symmetrically. When the anti-detachment mechanism 34 is sleeved with the male head 32 and the female head 33, the connecting rod 342 is located at the connection between the male head 32 and the female head 33. The connecting rod 342 increases the connection force between the two collars 341, so that the male head 32 and the female head 33 are wrapped by the two collars 341 and the connecting rod 342, thereby increasing the anti-detachment force of the male head 32 and the female head 33.

[0027] The connecting rod 342 is composed of an elastic band 3422 and an acrylic plate 3421. Two acrylic plates 3421 are fixed at both ends of the elastic band 3422. The two acrylic plates 3421 at the ends of the elastic band 3422 are respectively fixed to both sides of the elastic band 3422 with adhesive. The elasticity of the elastic band 3422 allows the length of the elastic band 3422 to be adjusted, so that the anti-detachment mechanism 34 can be used for connectors of different widths. The hardness of the acrylic plate 3421 makes it easy to fix the connecting rod 342 to the hook 343 and the collar 341.

[0028] The control accessories include a circuit breaker QF1 connected to the three-phase power supply and a PV multifunction meter connected to the circuit breaker QF1. Multiple fuses are also connected between the PV multifunction meter and the circuit breaker QF1. The frequency converter is connected to the PV multifunction meter and the circuit breaker QF1 via a current transformer, and fuses are also connected between the PV multifunction meter and the frequency converter. Figure 1 As shown, pins L11, L21, and L31 of circuit breaker QF1 are connected to fuses F1, F2, and F3, respectively. The other end of fuse F1 is connected to pin 11 of the PV multi-function meter, the other end of fuse F2 is connected to pin 14 of the PV multi-function meter, and the other end of fuse F3 is connected to pin 13 of the PV multi-function meter. Current transformer CT1 is connected between pins 4 and 5 of the PV multi-function meter, and current transformer CT2 is connected between pins 6 and 7 of the PV multi-function meter. Pins 8 and 9 of the PV multi-function meter... A current transformer CT3 is connected between the pins. The L1 pin of the frequency converter is connected to the current transformer CT1 through the Fa fuse. The L2 pin of the frequency converter is connected to the current transformer CT2 through the Fb fuse. The L3 pin of the frequency converter is connected to the current transformer CT3 through the Fc fuse. The PV multifunction meter plays a role in energy consumption detection. When an overload or short circuit occurs in the circuit, and the current exceeds the rated value of the fuse, the fuse will blow, thereby cutting off the circuit and protecting the PV multifunction meter, frequency converter and other equipment from damage caused by high current.

[0029] The control accessories also include an SP surge arrester and a circuit breaker QF2 connected to the SP surge arrester. One end of the circuit breaker QF2 is connected between the PV multifunction meter and the frequency converter. Pin L12 of the circuit breaker QF2 is connected to the end of the Fa fuse furthest from the frequency converter, pin L22 of the circuit breaker QF2 is connected to the end of the Fb fuse furthest from the frequency converter, and pin L32 of the circuit breaker QF2 is connected to the end of the Fc fuse furthest from the frequency converter. The SP surge arrester is mainly used to protect electrical equipment from damage caused by lightning overvoltage and switching overvoltage. When a lightning surge or switching overvoltage enters along the line, the surge arrester will quickly conduct, dissipating the energy of the overvoltage to the ground, thereby limiting the amplitude of the overvoltage and protecting downstream electrical equipment.

[0030] During operation, the operator inputs the required pressure through the control panel. The controller system sends a signal based on the set pressure, which is transmitted to the frequency converter via RS-485 communication. The frequency converter adjusts the motor speed according to the command. At the same time, the controller receives the analog signal transmitted from the pressure gauge. The system adjusts the frequency converter speed by comparing the required pressure with the current pressure, thereby keeping the load pressure the same as the required pressure. This achieves remote and separate control of the frequency converter and air compressor. By upgrading the controller's control logic, the frequency converter control system is made more stable and accurate. The frequency converter is placed in frequency converter control cabinet 1. By calculating the heat generated by the frequency converter load, a dedicated heat dissipation duct is designed, resulting in better heat dissipation. Frequency converter control cabinet 1 is installed in a constant temperature and humidity substation, significantly improving the operating environment, increasing the overall service life of the air compressor, reducing maintenance frequency and costs, and achieving energy saving and consumption reduction.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A separately installed variable frequency control system for an air compressor, characterized in that, The system includes a frequency converter control cabinet (1) installed in a power distribution room away from the air compressor and a controller (2) located in the air compressor compartment. The frequency converter control cabinet (1) is equipped with a frequency converter connected to the air compressor motor and control accessories connected to the frequency converter. The controller (2) is connected to the frequency converter via an RS485 communication module (3). The RS485 communication module (3) includes a terminal interface assembly for connecting the controller (2) to the frequency converter via a data cable (31) and has an anti-disconnection effect.

2. The variable frequency control system for a separately installed air compressor according to claim 1, characterized in that: The terminal interface assembly includes a data cable (31) connected to the frequency converter and a female connector (33) connected to the controller (2). One end of the data cable (31) is fixed with a male connector (32). After the female connector (33) and the male connector (32) are plugged in, they are connected by an anti-disconnection mechanism (34). The anti-disconnection mechanism (34) is sleeved on the outside of the male connector (32) and the female connector (33).

3. The variable frequency control system for a separately installed air compressor according to claim 2, characterized in that: The anti-detachment mechanism (34) includes two collars (341) sleeved on the male head (32) and the female head (33). Both the male head (32) and the female head (33) are provided with protrusions for the collars (341) to be sleeved on. One side of the collar (341) is fixed with an elastic connecting rod (342). One end of the connecting rod (342) is fixed with a hook (343). The other side of the collar (341) is provided with an insertion hole (344) for the hook (343) to be attached.

4. The separately installed variable frequency control system for an air compressor according to claim 3, characterized in that: The connecting rod (342) is located in the middle of the collar (341). The connecting rods (342) on the two collars (341) are arranged symmetrically. When the anti-detachment mechanism (34) is sleeved with the male head (32) and the female head (33), the connecting rod (342) is located at the connection between the male head (32) and the female head (33).

5. A separately installed variable frequency control system for an air compressor according to claim 4, characterized in that: The connecting rod (342) is composed of an elastic band (3422) and an acrylic plate (3421). Two acrylic plates (3421) are fixed at both ends of the elastic band (3422). The two acrylic plates (3421) located at the ends of the elastic band (3422) are respectively fixed to both sides of the elastic band (3422) by adhesive.

6. The variable frequency control system for a separately installed air compressor according to claim 1, characterized in that: The control accessories include a circuit breaker QF1 connected to three-phase electricity and a PV multifunction meter connected to the circuit breaker QF1. Multiple fuses are also connected between the PV multifunction meter and the circuit breaker QF1. The frequency converter is connected to the PV multifunction meter and the circuit breaker QF1 through a current transformer, and a fuse is also connected between the PV multifunction meter and the frequency converter.

7. A separately installed variable frequency control system for an air compressor according to claim 6, characterized in that: The control accessories also include an SP surge arrester and a circuit breaker QF2 connected to the SP surge arrester, with one end of the circuit breaker QF2 connected between the PV multifunction meter and the frequency converter.

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