Exhaust temperature control system of air-cooled roots vacuum pump

Abstract

The utility model belongs to the technical field of air-cooled Roots vacuum pumps, in particular to an exhaust temperature control system of an air-cooled Roots vacuum pump, which comprises an air-cooled Roots vacuum pump, a condenser and a control system, an air outlet of the air-cooled Roots vacuum pump is connected with an air inlet of the condenser, and reflux inlets are arranged on two sides of the air-cooled Roots vacuum pump. The reflux inlets are connected through a pipeline, an air outlet of the condenser is connected with the pipeline through an automatic regulating valve, a first temperature sensor is arranged between the air-cooled Roots vacuum pump and the condenser, a second temperature sensor is arranged at the air outlet of the condenser, and the control system is respectively connected with the automatic regulating valve, the first temperature sensor and the second temperature sensor. According to the air-cooled Roots vacuum pump, the exhaust temperature of the air-cooled Roots vacuum pump can be effectively controlled and stabilized, and the major fault problem of crystallization jamming or expansion jamming is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-cooled Roots vacuum pumps, in particular to an exhaust temperature control system of an air-cooled Roots vacuum pump. Background Art

[0002] The existing air-cooled Roots vacuum pumps all have a condenser at the exhaust port of the Roots vacuum pump, and then two gas paths are introduced from the exhaust port of the condenser into the air-cooling inlets on both sides of the Roots vacuum pump to cool the rotor of the Roots vacuum pump, thereby reducing the heat generated by the Roots vacuum pump during operation and increasing the maximum working pressure difference of the Roots vacuum pump. The problem is that the Roots vacuum pump and the condenser are fixedly matched without a coordinated adjustment function, the mechanical efficiency is low, the exhaust temperature varies with the different suction gases or the ambient temperature, and the stable temperature cannot be controlled. When the exhaust temperature of the suction gas is low during operation, crystallization will occur, resulting in a serious malfunction of the air-cooled Roots vacuum pump being stuck. When the exhaust temperature is too high, parts will expand due to heat and become stuck or deteriorate and be damaged. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the utility model proposes an exhaust temperature control system for an air-cooled Roots vacuum pump, which can effectively control and stabilize the exhaust temperature of the air-cooled Roots vacuum pump, avoiding the major failure problems of crystallization jamming or expansion jamming. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0004] An exhaust temperature control system for an air-cooled Roots vacuum pump comprises an air-cooled Roots vacuum pump, a condenser and a control system. The air outlet of the air-cooled Roots vacuum pump is connected to the air inlet of the condenser. Reflux ports are arranged on both sides of the air-cooled Roots vacuum pump. The reflux ports are connected through pipelines. The air outlet of the condenser is connected to the pipeline through an automatic regulating valve. A first temperature sensor is arranged between the air-cooled Roots vacuum pump and the condenser. A second temperature sensor is arranged at the air outlet of the condenser. The control system is respectively connected to the automatic regulating valve, the first temperature sensor and the second temperature sensor.

[0005] Furthermore, the control system is a PLC control system.

[0006] Furthermore, the automatic regulating valve is an electric regulating valve or a pneumatic regulating valve.

[0007] The utility model can effectively control and stabilize the exhaust temperature of the air-cooled Roots vacuum pump, thereby avoiding the serious fault problems of crystallization jamming or expansion jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0009] Figure 1 It is a schematic diagram of the structure of the utility model, such as Figure 1 As shown, an exhaust temperature control system of an air-cooled Roots vacuum pump comprises an air-cooled Roots vacuum pump 1, a condenser 2 and a control system 3, wherein the air outlet of the air-cooled Roots vacuum pump 1 is connected to the air inlet of the condenser 2, reflux ports 1.1 are provided on both sides of the air-cooled Roots vacuum pump 1, the reflux ports 1.1 are connected through pipelines 4, the air outlet of the condenser 2 is connected to the pipeline 4 through an automatic regulating valve 5, a first temperature sensor 6 is arranged between the air-cooled Roots vacuum pump 1 and the condenser 2, a second temperature sensor 7 is arranged at the air outlet of the condenser 2, and the control system 3 is respectively connected to the automatic regulating valve 5, the first temperature sensor 6 and the second temperature sensor 7.

[0010] The control system 3 is a PLC control system 3, which can program, set parameters and display various operating parameters or prompt alarm information on the screen. The automatic regulating valve 5 is an electric regulating valve or a pneumatic regulating valve. The automatic regulating valve 5 in this embodiment is an electric regulating valve.

[0011] The utility model monitors the gas temperature of the exhaust port of the air-cooled Roots vacuum pump 1 through the first temperature sensor 6, and monitors the gas temperature of the exhaust port of the condenser 2 through the second temperature sensor 7, and transmits the temperature to the control system 3, and then sets the parameters P, I, and D of the PID regulator in the control system 3, wherein P is the adjustment proportional coefficient, I is the integral time constant, and D is the differential time constant. The control system 3 calculates the required adjustment amount through the built-in PID regulator, and automatically adjusts the opening of the automatic regulating valve 5, so as to control the amount of gas refluxed from the exhaust port of the condenser 2 to the reflux port of the air-cooled Roots vacuum pump 1. This part of gas will purge and cool the inside of the air-cooled Roots vacuum pump 1. The greater the reflux amount, the greater the cooling amount, thereby realizing the control of the exhaust temperature of the exhaust port of the air-cooled Roots vacuum pump 1 and ensuring the stability of the gas temperature at the exhaust port of the air-cooled Roots vacuum pump 1.

[0012] In conclusion, the utility model can effectively control and stabilize the exhaust temperature of the air-cooled Roots vacuum pump, thereby avoiding the serious fault problems of crystallization jamming or expansion jamming.

Claims

1. An exhaust temperature control system for an air-cooled Roots vacuum pump, characterized in that: The invention comprises an air-cooled Roots vacuum pump, a condenser and a control system, wherein the air outlet of the air-cooled Roots vacuum pump is connected with the air inlet of the condenser, reflux ports are arranged on both sides of the air-cooled Roots vacuum pump, the reflux ports are connected through pipelines, the air outlet of the condenser is connected with the pipeline through an automatic regulating valve, a first temperature sensor is arranged between the air-cooled Roots vacuum pump and the condenser, a second temperature sensor is arranged at the air outlet of the condenser, and the control system is respectively connected with the automatic regulating valve, the first temperature sensor and the second temperature sensor.

2. The exhaust temperature control system of the air-cooled Roots vacuum pump according to claim 1 is characterized in that: The control system is a PLC control system.

3. The exhaust temperature control system of the air-cooled Roots vacuum pump according to claim 1 is characterized in that: The automatic regulating valve is an electric regulating valve or a pneumatic regulating valve.

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