Screw compressor high-pressure dual protection apparatus

Abstract

A screw compressor high-pressure dual protection apparatus, comprising: a motor, a first temperature sensor being provided on the motor; a high-pressure unit, the high-pressure unit and the motor being connected by means of a switch unit; an air / oil separating tank, a second temperature sensor being provided on the air / oil separating tank; and a compressor, the motor being in driving connection with the compressor, the compressor being provided with a first controller and a second controller, the first controller being in control connection with the first temperature sensor and the switch unit, and the second controller being in control connection with the second temperature sensor and the switch unit. The apparatus can perform dual trip protection on the motor when the motor is unable to stop normally, causing the motor to shut down in a timely manner, and thereby improving the safe use of the compressor.

Description

High-pressure dual protection device for screw compressors Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a high-pressure dual protection device for screw compressors. Background Technology

[0002] With the development of national industry, screw high-pressure compressors have been widely promoted. Currently, the compressor connects to the high-pressure compressor via hard contacts to receive start-up, stop, fault, and operation signals, and issues commands to the high-pressure compressor through the compressor controller's touchscreen. However, if the touchscreen malfunctions, it cannot issue a timely stop command to the high-pressure compressor, causing the high-pressure compressor and compressor motor to fail to disengage. In this situation, the motor cannot stop, which can easily lead to overheating and other safety hazards. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a high-pressure dual protection device for screw compressors is provided, which can solve the problem of motor overheating caused by the motor failing to stop normally.

[0004] To achieve the above-mentioned technical effects, the present invention provides a high-pressure dual protection device for a screw compressor, comprising:

[0005] An electric motor, wherein a first temperature sensor is installed on the electric motor;

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

[0007] An oil and gas tank, on which a second temperature sensor is installed;

[0008] The compressor is connected to a motor drive. The compressor is equipped with a first controller and a second controller. The first controller controls and connects to the first temperature sensor and the switching unit, and the second controller controls and connects to the second temperature sensor and the switching unit.

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

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

[0011] Preferably, both the first controller and the second controller have displays.

[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 effects of this utility model are as follows: This utility model provides a high-pressure dual protection device for a screw compressor. A first temperature sensor detects the motor temperature, and when the motor temperature exceeds a set protection value, a first controller controls the switching unit to promptly disconnect the motor and the high-pressure compressor. This provides tripping protection for the motor when its temperature rises due to the inability to stop normally. A second temperature sensor detects the oil-gas separator temperature, and when the oil-gas separator temperature exceeds a set protection value, a second controller controls the switching unit to promptly disconnect the motor and the high-pressure compressor. In the event of a failure of the first controller, the second controller can promptly disconnect the motor from the high-pressure compressor, stopping the motor. This utility model provides dual tripping protection when the motor cannot stop normally, ensuring timely shutdown and improving the safety of the compressor. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0017] The correspondence between the numbers in the diagram is as follows:

[0018] 1-First temperature sensor; 2-First controller; 3-Alarm; 4-Switch unit; 5-Second controller; 6-Second temperature sensor. Detailed Implementation

[0019] 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.

[0020] Please refer to Figure 1. This embodiment of the invention provides a high-pressure dual protection device for a screw compressor, including a motor, a high-pressure unit, an oil-gas separator, and a compressor. Wherein:

[0021] A first temperature sensor 1 is installed on the motor. The high-pressure machine and the motor are connected through a switching unit. A second temperature sensor 2 is installed on the oil and gas tank. The motor drives the compressor. The compressor is equipped with a first controller 2 and a second controller 5. The first controller 2 controls the first temperature sensor 1 and the switching unit 4. The second controller 5 controls the second temperature sensor 6 and the switching unit 4.

[0022] The high-pressure compressor provides power to the motor, which in turn powers the compressor, driving its rotor to rotate and thus compressing the gas. The compressor, through its internal mechanical motion (e.g., the screw in a screw compressor), compresses the low-pressure gas into high-pressure gas. This compressed high-pressure gas, mixed with oil droplets, is then introduced into an oil-gas tank for rotation. Most of the lubricating oil is separated and flows down the tank wall to the bottom. The first controller 2 collects signals from the first temperature sensor 1 and controls the switching unit 4. The second controller 5 collects signals from the second temperature sensor 6 and controls the switching unit 4. The first controller 2 can be an SCR9000 model controller, and the second controller 5 can be an XMTD-9012 model controller.

[0023] Specifically, the first temperature sensor 1 detects the motor temperature. When the compressor motor fails to disengage from the high-pressure unit due to a touchscreen malfunction, it continues to run, causing its temperature to rise. Once the motor temperature exceeds the set protection value, the first controller 2 is triggered. The second temperature sensor 6 detects the temperature of the oil-gas tank. Since the oil-gas tank heats up more slowly than the motor, its temperature does not exceed the set protection value, and the second controller 5 is not triggered. When the first controller 2 is triggered, it controls the switch unit 4 to open, disengaging the high-pressure unit from the motor and stopping it promptly. This prevents the motor and oil-gas tank temperatures from rising further and causes them to gradually decrease. Therefore, when the motor cannot stop normally while the first controller 2 is working normally, the temperature signal detected by the first temperature sensor 1 gradually increases until it exceeds the set protection value, and then gradually decreases.

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

[0025] Meanwhile, the oil and gas tank is prone to fire due to static electricity in the oil separator core. The second temperature sensor 6 detects the temperature of the oil and gas tank and can also monitor the temperature rise caused by static electricity in the oil separator core, thus enabling the second controller 5 to play a dual protection role.

[0026] In a preferred embodiment, the second controller 5 is connected to the first temperature sensor 1, which 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. When the motor temperature exceeds the motor temperature set protection value and the oil and gas tank temperature exceeds the oil and gas tank temperature set 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 malfunctions and cannot stop normally, the first controller 2 and the second controller 5 receive abnormal temperature signals from the motor. If the second controller 5 receives the abnormal temperature signal but subsequently continues to receive a gradually decreasing motor temperature signal, then the second controller 5 can detect that the first controller 2 is not malfunctioning; that is, the motor is being stopped 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 but subsequently continues to receive a continuously increasing abnormal temperature signal from the motor, then the second controller 5 can detect that the first controller 2 has failed and will be triggered when the temperature of the oil and gas tank rises above the set protection value of the oil and gas tank temperature.

[0028] In a preferred embodiment, the compressor is equipped with an alarm 3, which is connected to the first controller 2. When the motor temperature exceeds the set protection value, the first controller 2 controls the alarm 3 to sound an alarm.

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

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

[0031] In 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, typically a 4mA-20mA current signal or a 0V-10V voltage signal, which is suitable for long-distance transmission.

[0032] The screw compressor high-pressure dual protection device of this utility model has a first temperature sensor 1 to detect the motor temperature. When the compressor motor cannot be stopped due to the failure 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 trip protection role. The first controller 2 controls the switch unit 4 to disconnect the high pressure machine from the motor so that the motor can stop in time.

[0033] When the first controller 2 malfunctions or is misoperated, the motor cannot stop in time and the temperature continues to rise. At the same time, the temperature of the oil and gas tank is also rising. At this time, the second temperature sensor 6 detects the temperature of the oil and gas tank. Once the temperature of the oil and gas tank exceeds the set protection value, the second controller 6 controls the switching unit 4 to disconnect the high-pressure motor from the motor so that the motor can stop in time.

[0034] This utility model's screw compressor high-pressure dual protection device can provide dual trip protection for the motor, avoiding the inability to trip the motor and high-pressure compressor in time when a single controller malfunctions.

[0035] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model 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 this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

A high-pressure dual protection device for a screw compressor, characterized in that, include: An electric motor, wherein a first temperature sensor is installed on the electric motor; A high-voltage generator, wherein the high-voltage generator and the motor are connected via a switching unit; An oil and gas tank, on which a second temperature sensor is installed; The compressor is connected to a motor drive. The compressor is equipped with a first controller and a second controller. The first controller controls and connects to the first temperature sensor and the switching unit, and the second controller controls and connects to the second temperature sensor and the switching unit. The high-pressure dual protection device for screw compressors as described in claim 1 is characterized in that, The second controller controls the connection to the first temperature sensor. The high-pressure dual protection device for screw compressors as described in claim 1 is characterized in that, The compressor is equipped with an alarm, which is connected to the first controller. The high-pressure dual protection device for screw compressors as described in claim 1 is characterized in that, Both the first controller and the second controller are connected to a display screen. The high-pressure dual protection device for screw compressors as described in claim 1 is characterized in that, A first temperature transmitter is connected between the first temperature sensor and the first controller. The high-pressure dual protection device for screw compressors as described in claim 1 is characterized in that, A second temperature transmitter is connected between the second temperature sensor and the second controller.

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