Automatic cleaning system of mechanical vacuum pump

Abstract

The utility model discloses an automatic cleaning system for mechanical vacuum pumps in the field of polyester staple fiber spinning, which comprises a reaction kettle and a plurality of mechanical vacuum pumps sequentially connected end to end, and an air inlet at the end of an air inlet pipe of the mechanical vacuum pump at the head end is connected with the inside of the reaction kettle. An exhaust port of each mechanical vacuum pump located at the front end is connected with an air inlet in the end of an air inlet pipe of the mechanical vacuum pump located at the rear end through a connecting pipe, the side face of the air inlet pipe of each mechanical vacuum pump located in front of the mechanical vacuum pump located at the tail end is provided with an air inlet branch pipe, and each air inlet branch pipe is connected with the interior of the cleaning cylinder through a cleaning pipe. A cleaning agent is contained in the cleaning cylinder, and an electromagnetic valve is arranged on the cleaning pipe. According to the mechanical vacuum pump, the pump body can be regularly and conditionally cleaned irregularly through the cleaning system, pump blades are kept clean, the service life of the mechanical vacuum pump is prolonged, the operation rate of equipment is improved, and therefore the production cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of polyester staple fiber spinning, and particularly relates to an automatic cleaning system for a mechanical vacuum pump. Background Art

[0002] During the spinning process of polyester staple fiber, the raw materials are thickened and impurities are removed through the reactor. The inside of the reactor is in a vacuum state, and a mechanical vacuum pump is usually used to evacuate the internal system of the reactor. During the vacuuming process, a lot of oily substances will be drawn into the pump. The problem is that over time, the pump blades will get stuck, which is very difficult to clean, and the downtime is also very long. Generally, it will get stuck in a few days. In severe cases, the pump body will be damaged, the maintenance cost is high, and the equipment operation rate will be affected; the failure of the vacuum pump will increase the production waste and increase the production cost. Utility Model Content

[0003] The utility model aims to provide an automatic cleaning system for a mechanical vacuum pump, which can clean the pump body regularly and irregularly under certain conditions through the cleaning system, keep the pump blades clean, extend the service life of the mechanical vacuum pump, improve the equipment operation rate, and thus reduce production costs.

[0004] The purpose of the utility model is achieved as follows: a mechanical vacuum pump automatic cleaning system includes a reactor and a plurality of mechanical vacuum pumps connected end to end in sequence, the air inlet at the end of the air inlet pipe of the mechanical vacuum pump at the head end is connected to the interior of the reactor, each mechanical vacuum pump exhaust port at the front end is connected to the air inlet at the end of the air inlet pipe of the mechanical vacuum pump at the rear end via a connecting pipe, an air inlet branch pipe is provided on the side of the air inlet pipe of each mechanical vacuum pump located in front of the terminal mechanical vacuum pump, each air inlet branch pipe is connected to the interior of a cleaning cylinder via a cleaning pipe, the interior of the cleaning cylinder is filled with cleaning agent, and an electromagnetic valve is provided on the cleaning pipe.

[0005] The mechanical vacuum pumps of the utility model are connected in series in sequence, and the air inlet of the first mechanical vacuum pump is connected to the reactor for vacuuming. A liquid solenoid valve is added to the air inlet of each mechanical vacuum pump, and the cleaning agent is added by using the negative pressure suction principle. At the same time, a flow meter is added in front of each solenoid valve to control the flow rate during addition. Compared with the prior art, the beneficial effects of the utility model are: the use effect of the mechanical vacuum pump is improved, the use cycle of the mechanical vacuum pump can be maintained at about 25 days, the equipment operation rate is improved, and the production capacity is increased; the waste discharge is greatly reduced, and the production cost and maintenance cost, as well as the labor intensity of the maintenance personnel are saved.

[0006] As a further improvement of the present utility model, four mechanical vacuum pumps are provided.

[0007] As a further improvement of the utility model, the mechanical vacuum pump located at the end exhausts outwards.

[0008] As a further improvement of the utility model, a flow meter is provided on the cleaning pipe in front of the electromagnetic valve and corresponding to the cleaning cylinder, and the flow meter is used to control the flow rate during addition.

[0009] As a further improvement of the utility model, each motor of the mechanical vacuum pump is provided with a frequency converter, each frequency converter is connected to the PLC control unit, and each solenoid valve is also connected to the PLC control unit. The PLC control unit sets the time for the mechanical pump and adds at a fixed time; and the current signal of each pump is transmitted to the PLC through the frequency converter. The PLC sets the rated value for the motor current of each mechanical vacuum pump, and judges whether the motor load has increased by comparing the PLC set value. If the actual current is greater than the set value, it means that the pump blade is dirty, so the PLC gives an addition instruction, opens the solenoid valve, and cleans it. When the current drops and is less than the set value, the addition is stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 for Figure 1 A partial enlarged view of .

[0012] Figure 3 This is a connection diagram of each frequency converter, solenoid valve and PLC control unit.

[0013] Figure 4 This is the circuit schematic diagram of the PLC control unit.

[0014] Among them, 1 is a reaction kettle, 2 is a mechanical vacuum pump, 3 is a connecting pipe, 4 is an exhaust port, 5 is an air inlet pipe, 5a is an air inlet port, 6 is an air inlet branch pipe, 7 is a cleaning pipe, 8 is a cleaning cylinder, 9 is a solenoid valve, 10 is a flow meter, 11 is a frequency converter, and 12 is a PLC control unit. DETAILED DESCRIPTION

[0015] like Figure 1-3 As shown, a mechanical vacuum pump automatic cleaning system includes a reactor 1 and a plurality of mechanical vacuum pumps 2 connected end to end in sequence. The air inlet 5a at the end of the air inlet pipe 5 of the mechanical vacuum pump 2 at the head end is connected to the inside of the reactor 1. The exhaust port 4 of each mechanical vacuum pump 2 at the front end is connected to the air inlet 5a at the end of the air inlet pipe 5 of the mechanical vacuum pump 2 at the rear end through a connecting pipe 3. The air inlet branch pipe 6 is provided on the side of the air inlet pipe 5 of each mechanical vacuum pump 2 located in front of the end mechanical vacuum pump 2. Each air inlet branch pipe 6 is connected to the inside of a cleaning cylinder 8 through a cleaning pipe 7. The cleaning cylinder 8 is filled with cleaning agent. The cleaning pipe 7 is provided with a solenoid valve 9. A flow meter 10 is provided on the cleaning pipe 7 corresponding to the cleaning cylinder 8 in front of the solenoid valve 9. The flow meter 10 is used to control the flow rate during addition.

[0016] There are four mechanical vacuum pumps 2. The mechanical vacuum pumps 2 at the end exhaust outward.

[0017] Each motor of the mechanical vacuum pump 2 is provided with a frequency converter 11, each frequency converter 11 is connected to a PLC control unit 12, and each solenoid valve 9 is also connected to the PLC control unit 12. The PLC control unit 12 sets the time for the mechanical pump and adds at a fixed time; and the frequency converter 11 transmits the current signal of each pump to the PLC, and the PLC sets the rated value for the motor current of each mechanical vacuum pump 2. By comparing the PLC set value, it is determined whether the motor load has increased. If the actual current is greater than the set value, it means that the pump blade is dirty, so the PLC gives an addition instruction, opens the solenoid valve 9, and cleans it. When the current drops and is less than the set value, the addition is stopped.

[0018] Each mechanical vacuum pump 2 of the utility model is connected in series in sequence, and is connected to the reactor 1 through the air inlet 5a of the first mechanical vacuum pump 2 for vacuuming. A liquid solenoid valve 9 is added to the air inlet 5a of each mechanical vacuum pump 2, and the cleaning agent is added by using the negative pressure suction principle. At the same time, a flow meter 10 is added in front of each solenoid valve 9 to control the flow rate during addition. The advantages of the utility model are: the use effect of the mechanical vacuum pump 2 is improved, and the use cycle of the mechanical vacuum pump 2 can be maintained at about 25 days, which improves the equipment operation rate and increases the production capacity; it greatly reduces waste discharge, saves production costs and maintenance costs, and the labor intensity of maintenance personnel.

[0019] like Figure 4 , using Siemens S7200-224XP PLC, 8AI analog input module, Kunlun Tongtai TPC1031KT touch screen for system control. In manual mode, each pump can be started separately. In automatic mode, press the automatic start button to start pump No. 1 first, and when the vacuum pressure reaches the set value, pump No. 2 will be started automatically. When the current is normal, pump No. 3 will be started in 2 minutes (the time can be set), and pump No. 4 will be started by analogy. Pump No. 4 is connected to reactor 1. The addition time and interval time of the cleaning agent can be set. At the same time, the current of each pump can be set. When the current is greater than the set value, the solenoid valve 9 of the corresponding pump is opened for cleaning, and the cleaning is stopped when the current returns to normal.

[0020] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A mechanical vacuum pump automatic cleaning system, comprising a reaction kettle, characterized in that: It also includes a number of mechanical vacuum pumps connected end to end in sequence, the air inlet at the end of the air inlet pipe of the mechanical vacuum pump at the head end is connected to the inside of the reactor, the exhaust port of each mechanical vacuum pump at the front end is connected to the air inlet at the end of the air inlet pipe of the mechanical vacuum pump at the rear end via a connecting pipe, and an air inlet branch pipe is provided on the side of the air inlet pipe of each mechanical vacuum pump located in front of the end mechanical vacuum pump, and each air inlet branch pipe is connected to the inside of a cleaning cylinder via a cleaning pipe, the cleaning cylinder is filled with cleaning agent, and an electromagnetic valve is provided on the cleaning pipe.

2. The automatic cleaning system for a mechanical vacuum pump according to claim 1, characterized in that: The number of the mechanical vacuum pumps is four.

3. A mechanical vacuum pump automatic cleaning system according to claim 1 or 2, characterized in that: The mechanical vacuum pump located at the end exhausts air outward.

4. A mechanical vacuum pump automatic cleaning system according to claim 1 or 2, characterized in that: A flow meter is provided on the cleaning pipe in front of the solenoid valve and corresponding to the cleaning cylinder.

5. The automatic cleaning system for a mechanical vacuum pump according to claim 1 or 2, characterized in that: A frequency converter is provided on the motor of each mechanical vacuum pump, each frequency converter is connected to a PLC control unit, and each solenoid valve is also connected to the PLC control unit.

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