High-pressure dual-protection device of screw compressor

Abstract

The utility model discloses a high-pressure dual-protection device of a screw compressor, which comprises a motor, a first temperature sensor, a second temperature sensor, a first temperature sensor and a second temperature sensor, the high-pressure machine is connected with the motor through a switch unit; a second temperature sensor is arranged on the oil gas barrel; the motor is in drive connection with the compressor, the compressor is provided with a first controller and a second controller, the first controller is in control connection with the first temperature sensor and the switch unit, and the second controller is in control connection with the second temperature sensor and the switch unit. According to the utility model, double tripping protection can be carried out on the motor when the motor cannot be shut down normally, so that the motor can be shut down in time, and the use safety of the compressor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a high-pressure dual protection device for screw compressors. Background Art

[0002] With the development of national industry, screw high-pressure compressors have been vigorously promoted. At present, the compressor is connected to the high-pressure machine through hard contacts to receive start-up, shutdown, fault, and operation signals, and issues instructions to the high-pressure machine through the touch screen of the compressor controller. When the touch screen fails, the shutdown instruction cannot be issued to the high-pressure machine in time, causing the high-pressure machine and the compressor motor to be unable to be disconnected. At this time, the motor cannot be shut down, and the motor is prone to high temperature and other conditions, causing safety accidents. Utility Model Content

[0003] In order to overcome the defects of the prior art, a high-pressure dual protection device for a screw compressor is provided, which can solve the problem that the motor cannot be shut down normally, thereby causing the high temperature of the motor.

[0004] In order to achieve the above technical effects, the solution provided by the utility model is to provide a high-pressure dual protection device for a screw compressor, which includes:

[0005] A motor, wherein a first temperature sensor is provided on the motor;

[0006] A high-voltage machine, wherein the high-voltage machine and the motor are connected via a switch unit;

[0007] An oil and gas barrel, wherein a second temperature sensor is provided on the oil and gas barrel;

[0008] The motor drives the compressor, and the compressor is provided with a first controller and a second controller. The first controller controls the connection between the first temperature sensor and the switch unit, and the second controller controls the connection between the second temperature sensor and the switch unit.

[0009] Preferably, the second controller controls the connection to the first temperature sensor.

[0010] Preferably, the compressor is provided with an alarm, and the alarm is connected to the first controller.

[0011] Preferably, the first controller and the second controller are both connected to a display screen.

[0012] Preferably, a first temperature transmitter is connected between the first temperature sensor and the first controller.

[0013] Preferably, a second temperature transmitter is connected between the second temperature sensor and the second controller.

[0014] The beneficial effect of the utility model is that the high-pressure double protection device for a screw compressor of the utility model is provided with a first temperature sensor to detect the temperature of the motor, and when the temperature of the motor exceeds the set protection value, the first controller controls the switch unit to make the motor and the high-pressure machine trip in time, so that the motor can be tripped and protected when the temperature rises due to the inability to shut down normally. A second temperature sensor is provided to detect the temperature of the oil and gas barrel, and when the temperature of the oil and gas barrel exceeds the set protection value, the second controller controls the switch unit to make the motor and the high-pressure machine trip in time. When the first controller fails, the second controller can trip the motor and the high-pressure machine in time to shut down the motor. The utility model can provide double tripping protection for the motor when it cannot shut down normally, so that the motor can be shut down in time, thereby improving the safety of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of a high-pressure dual protection device for a screw compressor of the utility model.

[0017] The corresponding relationship of the numbers in the figure is as follows:

[0018] 1-first temperature sensor; 2-first controller; 3-alarm; 4-switch unit; 5-second controller; 6-second temperature sensor. DETAILED DESCRIPTION

[0019] 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 in 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.

[0020] See also Figure 1 As shown, the embodiment of the utility model provides a high-pressure dual protection device for a screw compressor, including a motor, a high-pressure machine, an oil and gas barrel, and a compressor. Among them:

[0021] A first temperature sensor 1 is arranged on the motor, the high pressure machine and the motor are connected through a switch unit, a second temperature sensor 2 is arranged on the oil and gas barrel, the motor drive is connected to the compressor, the compressor is provided with a first controller 2 and a second controller 5, the first controller 2 controls the connection between the first temperature sensor 1 and the switch unit 4, and the second controller 5 controls the connection between the second temperature sensor 6 and the switch unit 4.

[0022] The high pressure machine provides electricity to the motor, and the motor provides power to the compressor, driving the rotor of the compressor to rotate, thereby achieving gas compression. The compressor compresses the low-pressure gas into high-pressure gas through its internal mechanical movement (such as the screw in a screw compressor). The compressed high-pressure gas is mixed with oil droplets and passed into the oil and gas barrel for rotation. Most of the lubricating oil is separated and flows to the bottom along the barrel wall. The first controller 2 collects the signal of the first temperature sensor 1 and controls the switch unit 4 to work, and the second controller 5 collects the signal of the second temperature sensor 6 and controls the switch unit 4 to work. The first controller 2 can use the SCR9000 model controller, and the second controller 5 can use the xmtd-9012 model controller.

[0023] Specifically, the first temperature sensor 1 detects the temperature of the motor. When the compressor motor cannot be disconnected from the high-pressure machine and shut down due to a malfunction of the touch screen, the compressor motor will continue to run, causing the temperature to rise. Once the motor temperature exceeds the motor temperature setting protection value, the first controller 2 is triggered. The second temperature sensor 6 detects the temperature of the oil and gas barrel. Since the temperature of the oil and gas barrel rises slower than the temperature of the motor, the temperature of the oil and gas barrel does not exceed the oil and gas barrel temperature setting protection value at this time, and the second controller 5 will not be triggered. After the first controller 2 is triggered, it will control the switch unit 4 to open, so that the high-pressure machine and the motor are disconnected to shut down the motor in time, so that the temperature of the motor and the oil and gas barrel no longer rises and gradually decreases. Therefore, when the motor cannot shut down normally and the first controller 2 works normally, the temperature signal detected by the first temperature sensor 1 gradually increases to exceed the motor temperature setting protection value, and then gradually decreases.

[0024] When the first controller 2 fails, the switch unit 4 cannot be triggered in time, so that the motor and the high-voltage machine cannot be disconnected in time, the motor continues to heat up, and the temperature of the oil and gas barrel is also rising. Once the temperature of the oil and gas barrel exceeds the set protection value of the oil and gas barrel temperature, the second controller 5 is triggered and controls the switch unit 2 to open, and the high-voltage machine and the motor are disconnected to stop the motor in time.

[0025] At the same time, the oil and gas barrel is prone to fire due to static electricity in the oil core of the barrel. The second temperature sensor 6 detects the temperature of the oil and gas barrel and can also monitor the temperature increase caused by static electricity in the oil core, so that the second controller 5 plays a dual protection role.

[0026] As a preferred embodiment, the second controller 5 controls the connection to the first temperature sensor 1, and the first temperature sensor 1 transmits the motor temperature signal to the second controller 5, thereby ensuring that the second controller 5 detects the failure signal of the first controller 2. The second controller 5 can collect the motor temperature through the first temperature sensor 1, and when the motor temperature exceeds the motor temperature setting protection value and the oil and gas barrel temperature exceeds the oil and gas barrel temperature setting protection value, the second controller 5 will be triggered.

[0027] Specifically, the first temperature sensor 1 detects the motor temperature and transmits the temperature signal to the first controller 2 and the second controller 5. When the motor fails and cannot shut down normally, the first controller 2 and the second controller 5 receive the abnormal temperature signal of the motor. If the second controller 5 receives the abnormal temperature signal of the motor but continues to receive the gradually decreasing motor temperature signal, the second controller 5 can detect that the first controller 2 has not failed, that is, the motor is shut down by the first controller 2 at this time, and the second controller 5 will not be triggered. If the second controller 5 receives the abnormal temperature signal of the motor, but continues to receive the abnormal temperature signal of the motor that continues to rise, the second controller 5 can detect that the first controller 2 has failed and is triggered when the oil and gas barrel temperature rises to exceed the oil and gas barrel temperature setting protection value.

[0028] As a preferred embodiment, the compressor is provided with an alarm 3, and the alarm 3 is connected to the first controller 2. When the motor temperature exceeds the motor temperature setting protection value, the first controller 2 controls the alarm 3 to alarm.

[0029] As a preferred embodiment, the first controller 2 and the second controller 3 are both connected to a display screen. The controller transmits the temperature signal of the temperature sensor to the display screen for display.

[0030] As a preferred implementation, a first temperature transmitter is connected between the first temperature sensor and the first controller.

[0031] As a preferred embodiment, a second temperature transmitter is connected between the second temperature sensor and the second controller. The temperature transmitter converts the sensor signal into a standard signal, usually a 4mA-20mA current signal or a 0V-10V voltage signal, which is suitable for long-distance transmission.

[0032] In the utility model of the high-pressure dual protection device for a screw compressor, the first temperature sensor 1 detects the motor temperature. When the compressor motor cannot be shut down due to a malfunction of the touch screen, the compressor motor will continue to run, causing the temperature to rise. Once the motor temperature exceeds the set protection value, the first controller 2 will play a tripping protection role. The first controller 2 controls the switch unit 4 to trip the high-pressure machine and the motor to shut down the motor in time.

[0033] When the first controller 2 fails due to misoperation or malfunction, the motor cannot be shut down in time and the temperature is still rising. At the same time, the temperature of the oil and gas barrel is also rising. At this time, the second temperature sensor 6 detects the temperature of the oil and gas barrel. Once the temperature of the oil and gas barrel exceeds the set protection value, the second controller 6 controls the switch unit 4 to disconnect the high-voltage machine and the motor to shut down the motor in time.

[0034] The utility model discloses a screw compressor high-pressure double protection device, which can provide double tripping protection for the motor, thereby preventing the motor and the high-pressure machine from being tripped in time when a single controller has a problem.

[0035] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-pressure dual protection device for a screw compressor, characterized in that: include: A motor, wherein a first temperature sensor is provided on the motor; A high-voltage machine, wherein the high-voltage machine and the motor are connected via a switch unit; An oil and gas barrel, wherein a second temperature sensor is provided on the oil and gas barrel; The motor drives the compressor, and the compressor is provided with a first controller and a second controller. The first controller controls the connection between the first temperature sensor and the switch unit, and the second controller controls the connection between the second temperature sensor and the switch unit.

2. The high-pressure dual protection device for a screw compressor according to claim 1, characterized in that: The second controller controls the connection of the first temperature sensor.

3. The high-pressure dual protection device for a screw compressor according to claim 1, characterized in that: The compressor is provided with an alarm, and the alarm is connected to the first controller.

4. The high-pressure dual protection device for a screw compressor according to claim 1, characterized in that: The first controller and the second controller are both connected to a display screen.

5. The high-pressure dual protection device for a screw compressor according to claim 1, characterized in that: A first temperature transmitter is connected between the first temperature sensor and the first controller.

6. The high-pressure dual protection device for a screw compressor according to claim 1, characterized in that: A second temperature transmitter is connected between the second temperature sensor and the second controller.

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