Energy-saving control device of air compressor

Abstract

The utility model provides an energy-saving control device of an air compressor, and relates to the field of energy conservation. The power consumption of the air compressor can be reduced. The energy-saving control device of the air compressor comprises a motor energy-saving device and the air compressor, the motor energy-saving device comprises a pressure input end, a switch control end and a controller. The pressure input end is connected with a pressure sensor of the air compressor; the switch control end is connected with a motor of the air compressor and controls the motor to start or stop; the controller controls the switch control end to be switched off when the pressure of the pressure input end is larger than a preset upper limit value, and controls the switch control end to be switched on when the pressure is smaller than a preset lower limit value.

Description

Technical Field

[0001] The utility model relates to the technical field of energy saving, in particular to an energy saving control device for an air compressor. Background Art

[0002] Air compressors, usually referred to as air compressors, are widely used in industrial production. Their working process can be divided into four processes: suction, sealing and conveying, compression, and exhaust. Taking a single-screw air compressor as an example, when the screw rotates in the housing, it meshes with the teeth of the housing, and air is sucked in from the air inlet, and the engine oil is also sucked in. As the tooth groove meshing surface rotates, the sucked oil and gas are sealed and conveyed to the exhaust port; during the conveying process, the tooth groove meshing gap gradually becomes smaller, and the oil and gas are compressed; when the tooth groove meshing surface rotates to the housing exhaust port, the oil and gas mixture with a higher pressure is discharged from the body.

[0003] When the air compressor supplies gas to the gas-using equipment, the loading and unloading solenoid valve is used. When the air compressor is started, the solenoid valve is in a non-working state, the cylinder does not move, the air inlet of the air compressor is closed, and the motor starts without load. After the air compressor starts running, if the gas-using equipment consumes a large amount of gas, and the compressed gas pressure in the gas tank and pipeline has not reached the upper limit, the solenoid valve is controlled to open, the motor runs under load, and a compressor is generated to the gas-using equipment. If the gas-using equipment stops using gas, the pressure in the gas tank and pipeline increases, and when it reaches the upper limit, the solenoid valve is controlled to stop working, the air inlet is closed, and the motor runs without load. Due to the working cycle of the gas-using equipment or the difference in production process, the gas consumption fluctuates, which sometimes causes the air compressor to be frequently loaded and unloaded. After the air compressor is unloaded, the motor still runs at the power frequency, which not only wastes electricity but also increases the mechanical wear of the equipment. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide an air compressor energy-saving control device, which can shut down the motor after the air compressor is unloaded to avoid increased power consumption caused by the operation of the motor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an air compressor energy-saving control device, comprising:

[0007] Motor energy-saving devices and air compressors;

[0008] The motor energy-saving device comprises a pressure input terminal, a switch control terminal and a controller;

[0009] The pressure input end is connected to the pressure sensor of the air compressor;

[0010] The switch control end is connected to the motor of the air compressor to control the motor to start or stop;

[0011] The controller controls the switch control end to be disconnected when the pressure at the pressure input end is greater than a preset upper limit value, and controls the switch control end to be connected when the pressure is less than a preset lower limit value.

[0012] In an exemplary embodiment, based on the foregoing, the switch control end is also connected to the solenoid valve of the air compressor to control the start or stop of the solenoid valve.

[0013] The switch control end is an intermediate relay, which is connected to the motor through a first contact thereof and is connected to the solenoid valve through a second contact thereof;

[0014] The first contact and the second contact have the same switching state.

[0015] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0016] A switch circuit is connected to a star-angle conversion circuit, and the star-angle conversion circuit provides a start signal for the air compressor.

[0017] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0018] a first AC contactor, connected to a power supply current through the first AC contactor;

[0019] A second AC contactor is connected to the motor through the second AC contactor.

[0020] In an exemplary embodiment, based on the foregoing, the fan of the air compressor is connected between the power supply current and the first AC contactor.

[0021] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0022] A third AC contactor, through which the power supply current is connected to the motor of the air compressor.

[0023] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0024] A first intermediate relay, wherein the controller controls the first fault indicator light to turn on or off via the first intermediate relay.

[0025] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0026] The second intermediate relay, the controller controls the operation status indicator light to turn on or off through the second intermediate relay.

[0027] In an exemplary embodiment, based on the foregoing, the motor energy saving device further includes:

[0028] The third intermediate relay is connected between the second fault indicator light and the switch circuit, and is connected to the second fault indicator light when the switch circuit is abnormal.

[0029] The utility model adopts the above technical solution, which has at least the following beneficial effects:

[0030] It can be known from the above technical scheme that the air compressor energy-saving control device provided by the utility model includes a motor energy-saving device and an air compressor. The motor energy-saving device includes a pressure input end connected to the pressure sensor of the air compressor, and the switch control end of the motor energy-saving device is connected to the motor of the air compressor. When the pressure at the pressure input end is greater than a preset upper limit value, the controller of the motor energy-saving device controls the switch control end to disconnect, thereby stopping the motor of the air compressor. When the pressure is less than a preset lower limit value, the controller of the energy-saving device controls the switch control end to connect the motor of the air compressor, so that the motor runs. When the pressure of the air compressor is high, the gas-using equipment does not use gas. At this time, the motor is turned off to avoid the motor from running at no load, which can reduce power consumption and reduce the wear and tear on the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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 these drawings without paying creative work.

[0032] Figure 1 This is a structural diagram of an air compressor energy-saving control device provided in one embodiment of the utility model.

[0033] Reference numerals:

[0034] 10. Motor energy saving device, 20. Air compressor. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. 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 implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0036] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments.

[0037] The utility model provides an air compressor energy-saving control device, which realizes energy-saving operation of the air compressor. Exemplarily, the air compressor energy-saving control device can be applied to various air compressors, such as screw compressors, vane compressors, piston compressors, etc., and this embodiment does not make special restrictions on this. The air compressor usually includes various modules such as a motor, a fan, an air storage tank, an air transmission pipeline, a pressure sensor, a fan, etc., and this embodiment does not make special restrictions on this.

[0038] Figure 1 This is a structural diagram of an air compressor energy-saving control device provided by an embodiment of the utility model. Figure 1 The air compressor energy-saving control device provided by the utility model includes a motor energy-saving device 10 and an air compressor 20.

[0039] The motor energy-saving device 10 includes a pressure input end, a switch control end and a controller; the pressure input end is connected to the pressure sensor of the air compressor 20; the switch control end is connected to the motor of the air compressor 20 to control the start or stop of the motor; the controller controls the switch control end to disconnect when the pressure at the pressure input end is greater than a preset upper limit value, and controls the switch control end to connect when the pressure is less than a preset lower limit value.

[0040] The preset upper limit value is greater than the preset lower limit value. The specific values ​​of the preset upper limit value and the preset lower limit value are set according to actual conditions, and this implementation does not make any special restrictions on this.

[0041] The motor energy-saving device 10 includes a pressure input terminal, a switch control terminal and a controller. Specifically, the pressure input terminal includes two ports, namely port AI1 and port GND. Port AI1 is connected to the output terminal of the pressure sensor of the air compressor, and port GND is the ground terminal. The pressure detected by the pressure sensor of the air compressor 20 can be transmitted to the motor energy-saving device 10 through these two ports.

[0042] The switch control terminal may include a port RA and a port RC, which are controlled by a controller ( Figure 1 The switch control terminal may be specifically an intermediate relay (i.e., intermediate relay 1), and port RA and port RC are a pair of contacts, which are connected to the motor of the air compressor 20 through the pair of contacts to control the start or stop of the motor.

[0043] The switch control end is also connected to the solenoid valve of the air compressor 20 to control the start or stop of the solenoid valve. The switch control end is an intermediate relay 1, which includes multiple pairs of contacts. The first contact is connected to the motor, and the second contact is connected to the solenoid valve; the first contact and the second contact have the same switch state. That is, when the first contact is disconnected, the motor stops running, and the second contact is also disconnected, and the solenoid valve is closed; when the first contact is connected, the motor starts, the second contact is also connected, and the solenoid valve is also started.

[0044] Exemplarily, the motor energy saving device 10 further includes: a switch circuit, the switch circuit is connected to the star-angle conversion circuit, and the star-angle conversion circuit provides a start signal for the air compressor 20. The switch circuit includes two connection ports, port DI1 and port COM, and the connection relationship with the star-angle conversion circuit is as follows: Figure 1 shown.

[0045] The star-delta conversion circuit is a starting circuit of the air compressor 20, also known as a star-delta conversion circuit, and includes three AC contactors, one for connecting the main circuit to the power supply, one for Y-type starting, and one for delta starting.

[0046] The motor energy-saving device 10 further includes: a first AC contactor, connected to the power supply current through the first AC contactor; and a second AC contactor, connected to the motor through the second AC contactor. The fan of the air compressor 20 is connected between the power supply current and the first AC contactor. The fan is a fan in the air compressor 20 for cooling.

[0047] The supply current can be disconnected or connected through the first AC contactor. The motor of the air compressor 20 can be disconnected or connected through the second AC contactor.

[0048] The motor energy-saving device 10 further includes: a third AC contactor, through which the power supply current is connected to the motor of the air compressor 20. When the motor energy-saving device 10 is abnormal, the air compressor 20 can be made to work normally by connecting the third AC contactor.

[0049] The motor energy-saving device 10 further includes: a first intermediate relay, and the controller controls the first fault indicator light to turn on or off through the first intermediate relay.

[0050] The first intermediate relay is intermediate relay 4, which is connected to a pair of contacts of intermediate relay 1: contact 1RA and contact 1RC. When the controller of motor energy-saving device 10 controls intermediate relay 1 normally, intermediate relay 4 can be controlled to be disconnected. When the control is abnormal, the controller can connect intermediate relay 4, thereby turning on the first fault indicator light to prompt the user that the device is abnormal.

[0051] The motor energy-saving device 10 further includes: a second intermediate relay, and the controller controls the operation status indicator light to turn on or off through the second intermediate relay.

[0052] The second intermediate relay is the intermediate relay 3, which is connected to a pair of contacts of the intermediate relay 1, which can be marked as contact 2RA and contact 2RC. The operation status indicator light is connected through the intermediate relay 3. When the intermediate relay 1 is working, the operation status indicator light is turned on to remind the user that the motor energy saving device 10 is working; when the intermediate relay 1 is disconnected, the operation status indicator light is turned off.

[0053] The motor energy-saving device 10 further includes: a third intermediate relay connected between the second fault indicator light and the switch circuit, and connected to the second fault indicator light when the switch circuit is abnormal.

[0054] Continue to refer Figure 1 The third intermediate relay is intermediate relay 2, which can be connected to port DI3 and port COM of the motor energy-saving device 10. When the switch module works abnormally, intermediate relay 2 works, thereby controlling the fault indicator light to turn on. When the switch module works normally, intermediate relay 2 does not work, and the fault indicator light remains off.

[0055] The controller of the motor energy-saving device may be a programmable logic controller.

[0056] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

Claims

1. An air compressor energy-saving control device, characterized in that: include: Motor energy-saving devices and air compressors; The motor energy-saving device comprises a pressure input terminal, a switch control terminal and a controller; The pressure input end is connected to the pressure sensor of the air compressor; The switch control end is connected to the motor of the air compressor to control the motor to start or stop; The controller controls the switch control end to be disconnected when the pressure at the pressure input end is greater than a preset upper limit value, and controls the switch control end to be connected when the pressure is less than a preset lower limit value.

2. The air compressor energy-saving control device according to claim 1, characterized in that: The switch control end is also connected to the solenoid valve of the air compressor to control the start or stop of the solenoid valve.

3. The air compressor energy-saving control device according to claim 2, characterized in that: The switch control end is an intermediate relay, which is connected to the motor through a first contact thereof and is connected to the solenoid valve through a second contact thereof; The first contact and the second contact have the same switching state.

4. The air compressor energy-saving control device according to claim 1, characterized in that: The motor energy-saving device also includes: A switch circuit is connected to a star-angle conversion circuit, and the star-angle conversion circuit provides a start signal for the air compressor.

5. The air compressor energy-saving control device according to claim 1, characterized in that: The motor energy-saving device also includes: a first AC contactor, connected to a power supply current through the first AC contactor; A second AC contactor is connected to the motor through the second AC contactor.

6. The air compressor energy-saving control device according to claim 5, characterized in that: The fan of the air compressor is connected between the power supply current and the first AC contactor.

7. The air compressor energy-saving control device according to claim 1, characterized in that: The motor energy-saving device also includes: A third AC contactor, through which the power supply current is connected to the motor of the air compressor.

8. The air compressor energy-saving control device according to claim 1, characterized in that: The motor energy-saving device also includes: A first intermediate relay, wherein the controller controls the first fault indicator light to turn on or off via the first intermediate relay.

9. The air compressor energy-saving control device according to claim 1, characterized in that: The motor energy-saving device also includes: The second intermediate relay, the controller controls the operation status indicator light to turn on or off through the second intermediate relay.

10. The air compressor energy-saving control device according to claim 4, characterized in that: The motor energy-saving device also includes: A third intermediate relay is connected between the second fault indicator light and the switch circuit, and is connected to the second fault indicator light when the switch circuit is abnormal.

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