Vacuumizing device of sheet production line

Abstract

The utility model discloses a vacuumizing device of a sheet production line, the vacuumizing device is in fluid communication with an exhaust port of an extruder, the vacuumizing device comprises a gas filtering system, a three-stage pump system, a water circulation system and a pump cleaning system, the gas filtering system comprises a gas inlet pipeline, a filtering tank and a cooling tank which are communicated in sequence; the third-stage pump system comprises a second-stage vacuum pump, a first-stage vacuum pump and a water ring vacuum pump which are communicated in sequence; the water circulation system comprises a cooling water tank and a condenser, and the cooling water tank is communicated with the water ring vacuum pump to receive fluid output by the three-stage pump system; the pump cleaning system comprises a cleaning oil tank in fluid communication with the second-stage vacuum pump, and a ball valve is arranged between the cleaning oil tank and the second-stage vacuum pump. The device is simple in structure and high in suction force, and the suction and treatment time is saved so as to improve the exhaust efficiency; the temperature of the vacuum pump is reduced through the water circulation system, the vacuum pump is conveniently cleaned and protected by adding the pump cleaning system, the service life of the vacuum pump is prolonged, and different working conditions can be compatible.

Description

Technical Field

[0001] The present application relates to the technical field of sheet material production equipment, and in particular to a vacuum pumping device for a sheet material production line. Background Art

[0002] In order to ensure the quality of the sheet and avoid bubbles and impurities on the surface of the produced sheet products, the extruders of the current sheet production line are all connected to a vacuum system to discharge the gas in the extruder and the impurities carried in the gas. The existing vacuum system has a low air extraction rate, and after the vacuum pump has worked for a long time, grease will be deposited in the pump body. Such grease will affect the performance of the vacuum pump, reduce the service life of the vacuum pump, reduce the working efficiency of the vacuum system, and affect the quality of the sheet. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide a vacuum pumping device with extended service life and high working efficiency.

[0004] To achieve the above object, the present application adopts the following technical solution: a vacuum pumping device for a sheet production line, which is fluidically connected to the exhaust port of the extruder, and the vacuum pumping device comprises:

[0005] A gas filtration system, comprising an air intake pipeline, a filter tank and a cooling tank connected in sequence, wherein the filter tank has an air inlet and an air outlet, the air intake pipeline fluid is connected to the exhaust port and the air intake, the cooling tank has an air intake channel connected to the air outlet of the filter tank and a cooling channel connected to an external cooling water source, and the air intake channel and the cooling channel are in heat exchange with each other;

[0006] A three-stage pump system includes a secondary vacuum pump, a primary vacuum pump and a water ring vacuum pump which are connected in sequence, wherein the secondary vacuum pump is fluidically connected to the air inlet channel to pump the fluid in the air inlet channel;

[0007] A water circulation system, comprising a cooling water tank and a condenser, wherein the cooling water tank is connected to the water ring vacuum pump to receive the fluid output by the three-stage pump system, and the cooling water tank is also provided with an external exhaust port for outputting gas, and the external exhaust port is provided at the top of the cooling water tank; the condenser comprises an internal circulation channel and an external circulation channel externally connected to the cooling water source, the internal circulation channel has an inlet and an outlet, the inlet is connected to the cooling water tank to receive the liquid in the cooling water tank, and the outlet is connected to the water ring vacuum pump to provide liquid to the water ring vacuum pump; and

[0008] The pump cleaning system comprises a cleaning oil tank in fluid communication with the secondary vacuum pump, the cleaning oil tank is used to store cleaning oil, and a ball valve is arranged between the cleaning oil tank and the secondary vacuum pump.

[0009] In the above technical solution, it is further preferred that multiple layers of filter cotton are arranged between the air inlet and the air outlet of the filter tank.

[0010] In the above technical solution, it is further preferred that a delivery pipeline is connected between the air intake channel and the secondary vacuum pump, the delivery pipeline is externally connected to a pressure relief channel, a pneumatic angle seat valve and a pressure gauge for detecting the air pressure in the delivery pipeline are provided at the pressure relief channel, and the pneumatic angle seat valve is used to block and connect the fluid connection between the pressure relief channel and the delivery pipeline.

[0011] In the above technical solution, it is further preferred that the pressure gauge is connected to the controller signal of the pneumatic angle seat valve, and the controller is configured to control the operation of the pneumatic angle seat valve based on the detection result of the pressure gauge.

[0012] In the above technical solution, it is further preferred that a pneumatic butterfly valve is provided in the conveying channel, and the pneumatic butterfly valve is used to block and connect the fluid connection between the air intake channel and the secondary vacuum pump, and the pneumatic butterfly valve is located downstream of the pressure relief channel in the conveying channel.

[0013] In the above technical solution, it is further preferred that the secondary vacuum pump and the primary vacuum pump, as well as the primary vacuum pump and the water ring vacuum pump are connected via a metal bellows fluid.

[0014] In the above technical solution, it is further preferred that the primary vacuum pump and the secondary vacuum pump are both Roots pumps.

[0015] In the above technical solution, it is further preferred that the cooling water tank has a liquid outlet connected to the inlet of the internal circulation channel, and the liquid outlet is opened at the lower side of the external drain port.

[0016] In the above technical solution, it is further preferred that the cooling water source is connected to the vacuum pumping device through a water inlet pipe and a water return pipe, the water inlet of the cooling channel and the water inlet of the external circulation channel are both connected to the water inlet pipe, and the water outlet of the cooling channel and the water outlet of the external circulation channel are both connected to the water return pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The structure of the present application is simple. The air exhausted from the extruder is processed by primary filtration and cooling, and the suction force is enhanced by a three-stage pump system, saving suction and processing time to improve exhaust efficiency; the temperature of the air exhausted from the extruder and the temperature of the vacuum pump are continuously reduced by a water circulation system, thereby protecting the vacuum pump and extending the service life of the vacuum pump; adding a pump cleaning system facilitates the cleaning and protection of the vacuum pump, further extending the service life of the vacuum pump, and is compatible with different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a vacuum pumping device provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 A front view of the vacuum extraction device in FIG.

[0021] Figure 3 for Figure 1 A side view of the vacuum extraction device in FIG.

[0022] Figure 4 for Figure 1 Schematic diagram of the working principle of the vacuum extraction device.

[0023] Among them: 100, vacuum device; 10, gas filtration system; 1, air inlet pipeline; 2, filter tank; 21, air inlet; 22, air outlet; 23, filter cotton; 3, cooling tank; 31, air inlet channel; 32, cooling channel; 20, three-stage pump system; 4, two-stage vacuum pump; 5, one-stage vacuum pump; 6, water ring vacuum pump; 61, oil drain port; 7, conveying pipeline; 71, pressure relief channel; 72, pneumatic angle seat valve; 73, pressure gauge; 8, metal bellows; 30, water circulation system; 9, cooling water tank; 91, out-of-bounds drain port; 11, condenser; 111, internal circulation channel; 112, external circulation channel; 40, pump cleaning system; 12, cleaning oil tank; 13, ball valve; 200, extruder; 300, cooling water source. DETAILED DESCRIPTION

[0024] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0025] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0026] The present application provides a vacuum extraction device for a sheet production line, which is fluidically connected to an exhaust port of an extruder and is used to filter and cool the air containing impurities output from the exhaust port, and finally discharge the clean air out of the sheet production line.

[0027] like Figure 1 , 4 As shown, the vacuum device 100 includes: a gas filtration system 10, a three-stage pump system 20, a water circulation system 30 and a pump cleaning system 40, wherein the gas filtration system 10 is used to filter and cool the air exhausted by the extruder 200; the three-stage pump system 20 is used to load the exhaust port of the extruder 200 and the gas filtration system 10 with suction negative pressure, so that the air containing impurities can be efficiently extracted from the extruder 200 to prevent the air containing impurities from affecting the quality of the material extruded by the extruder 200; the water circulation system 30 is used to cool the cooling components of the gas filtration system 10 and the multiple working components of the three-stage pump system 20 to ensure the working performance of the cooling components and the working components and improve the working efficiency; the pump cleaning system 40 is used to maintain and clean the vacuum pump of the three-stage pump system 20 to extend the service life of the three-stage pump system 20.

[0028] like Figure 1 , 4As shown, the gas filtration system 10 includes an air intake pipeline 1, a filter tank 2 and a cooling tank 3 which are connected in sequence. The filter tank 2 has an air intake port 21 and an air outlet port 22. A multi-layer filter cotton 23 is arranged between the air intake port 21 and the air outlet port 22 of the filter tank 2. The air discharged from the exhaust port of the extruder 200 is filtered by the multi-layer filter cotton 23, so that impurities in the air remain in the filter tank 2. The air intake pipeline 1 fluidly connects the exhaust port of the extruder 200 and the air intake port 21 of the filter tank 2. Under the suction action of the three-stage pump system 20, the air discharged from the extruder 200 enters the filter tank 2 through the air intake pipeline 1 and is filtered by the multi-layer filter cotton 23 in the filter tank 2. The cooling tank 3 includes an air intake channel 31 fluidly connected to the air outlet 22 of the filter tank 2 and a cooling channel 32 connected to an external cooling water source 300. The air intake channel 31 and the cooling channel 32 are independently arranged. The gas in the air intake channel 31 exchanges heat with the cooling water in the cooling channel 32, thereby achieving the purpose of lowering the temperature of the gas in the air intake channel 31. The cooled gas enters the three-stage pump system 20, avoiding a sharp increase in the temperature of the three-stage pump system 20, thereby protecting the multiple vacuum pumps in the three-stage pump system 20.

[0029] like Figure 1 , 3 As shown, the three-stage pump system 20 includes a secondary vacuum pump 4, a primary vacuum pump 5 and a water ring vacuum pump 6 connected in sequence. The secondary vacuum pump 4 is fluidly connected to the air inlet channel 31 through a delivery pipeline 7. The secondary vacuum pump 4 and the primary vacuum pump 5, as well as the primary vacuum pump 5 and the water ring vacuum pump 6 are fluidly connected through a metal bellows 8. The vacuum pumps connected in sequence form a unidirectional gas delivery channel to suck the fluid in the air inlet channel 31. In the embodiment of the present application, the secondary vacuum pump 4 and the primary vacuum pump 5 are both Roots pumps. When the three-stage pump system 20 is working, the water ring vacuum pump 6 is started first, and after the three-stage pump system 20 reaches a certain vacuum degree, the primary vacuum pump 5 is started, and then the secondary vacuum pump 4 is started, so as to ensure the continuity of the suction flow, so that each vacuum pump is in the best working state, and play a protective role for each vacuum pump.

[0030] like Figure 2 , 4 As shown, the delivery pipeline 7 is externally connected to a pressure relief channel 71, and a pneumatic angle seat valve 72 and a pressure gauge 73 for detecting the air pressure in the delivery pipeline 7 are provided at the pressure relief channel 71. The pneumatic angle seat valve 72 is used to block and connect the fluid communication between the pressure relief channel 71 and the delivery pipeline 7. The pneumatic angle seat valve 72 can be manually opened by an operator to release pressure when the operator observes that the pressure gauge 73 shows that the pressure is too high. In other embodiments, the pressure gauge is connected to the controller signal of the pneumatic angle seat valve, and the controller is configured to control the operation of the pneumatic angle seat valve based on the detection result of the pressure gauge, so as to realize automatic pressure relief of the delivery pipeline 7 by the pneumatic angle seat valve.

[0031] A pneumatic butterfly valve (not shown in the figure) is provided in the delivery pipeline 7. The pneumatic butterfly valve is used to block and connect the fluid connection between the air inlet channel 31 and the secondary vacuum pump 4. The pneumatic butterfly valve is located downstream of the pressure relief channel 71 in the delivery pipeline 7. The pressure gauge 73 cooperates with the pneumatic butterfly valve to check the air tightness of the gas filtration system 10 and the tertiary pump system 20.

[0032] like Figure 1 , 4 The water circulation system 30 includes a cooling water tank 9 and a condenser 11. The cooling water tank 9 is connected to the water ring vacuum pump 6 to receive the fluid output by the tertiary pump system 20. The cooling water tank 9 is provided with an external exhaust port 91 for outputting gas. The external exhaust port 91 is provided at the top of the cooling water tank 9 to discharge the air sucked by the tertiary pump system 20 into the external environment. The condenser 11 includes an internal circulation channel 111 and an external circulation channel 112 connected to an external cooling water source 300. The internal circulation channel 111 has an inlet and an outlet. The inlet is connected to the cooling water tank 9 to receive the liquid in the cooling water tank 9, and the outlet is connected to the water ring vacuum pump 6 to provide liquid to the water ring vacuum pump 6. The liquid in the internal circulation channel 111 performs heat exchange with the cooling water in the external circulation channel 112, thereby reducing the temperature of the liquid in the internal circulation channel 111. The water in the cooling water tank 9 is transported to the water ring vacuum pump 6 after being cooled by the condenser 11. The water transported by the condenser 11 through the inner circulation channel 111 forms an air inlet cavity for sucking gas and an air outlet cavity for outputting gas under the rotation of the eccentric rotor of the water ring vacuum pump 6. The air outlet cavity transports the sucked gas to the cooling water tank 9 through the air pipe, and the gas is discharged from the cooling water tank through the outer emptying port 91 under the pressure of the water in the cooling water tank 9; the working water in the water ring vacuum pump 6 is transported back to the cooling water tank 9 through a water pipe circulation, and then transported to the water ring vacuum pump 6 for work after being cooled by the condenser 11, realizing water circulation. The circulating water cools the water ring vacuum pump 6, effectively ensuring the working performance of the water ring vacuum pump 6. The cooling water tank 9 has a liquid outlet connected to the inlet of the inner circulation channel 111, and the liquid outlet is opened at the lower side of the outer emptying port 91.

[0033] The cooling water source 300 is connected to the vacuum pumping device 100 through an inlet pipe and a return pipe. The water inlet of the cooling channel 32 and the water inlet of the external circulation channel 112 are both connected to the inlet pipe, and the water outlet of the cooling channel 32 and the water outlet of the external circulation channel 112 are both connected to the return pipe. The cooling water source 300 continuously provides cooling water to the vacuum pumping device 100 to ensure stable operation of the vacuum pumping device 100.

[0034] like Figure 1 , 4As shown, the pump cleaning system 40 includes a clean oil tank 12 in fluid communication with the secondary vacuum pump 4. The clean oil tank 12 is used to store clean oil. A ball valve 13 is provided between the clean oil tank 12 and the secondary vacuum pump 4. The water ring vacuum pump 6 is provided with an oil drain port 61 for outputting waste oil to the tertiary pump system 20. When the tertiary pump system 20 is pumping the gas filtration system 10, the ball valve 13 is closed; when the tertiary pump system 20 is being maintained, the ball valve 13 is opened, the clean oil tank 12 is in communication with the secondary vacuum pump 4, and the secondary vacuum pump 4 sucks the clean oil in the clean oil tank 12 into the tertiary pump system 20. The clean oil flows through the secondary vacuum pump 4, the primary vacuum pump 5 and the water ring vacuum pump 6 in sequence to remove the grease deposited in each pump body. The oil drain port 61 discharges the clean oil containing the grease. The pump cleaning system 40 keeps each vacuum pump clean and prolongs the service life of each vacuum pump.

[0035] The structure of the present application is simple. The air exhausted from the extruder is processed by primary filtration and cooling, and the suction force is enhanced by a three-stage pump system, saving suction and processing time to improve exhaust efficiency; the temperature of the air exhausted from the extruder and the temperature of the vacuum pump are continuously reduced by a water circulation system, thereby protecting the vacuum pump and extending the service life of the vacuum pump; adding a pump cleaning system facilitates the cleaning and protection of the vacuum pump, further extending the service life of the vacuum pump, and is compatible with different working conditions.

[0036] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A vacuum pump for a sheet production line, fluidly connected to the exhaust port of an extruder, characterized in that: The vacuum pumping device comprises: A gas filtration system, comprising an air intake pipeline, a filter tank and a cooling tank connected in sequence, wherein the filter tank has an air inlet and an air outlet, the air intake pipeline fluid is connected to the exhaust port and the air intake, the cooling tank has an air intake channel connected to the air outlet of the filter tank and a cooling channel connected to an external cooling water source, and the air intake channel and the cooling channel are in heat exchange with each other; A three-stage pump system includes a secondary vacuum pump, a primary vacuum pump and a water ring vacuum pump which are connected in sequence, wherein the secondary vacuum pump is fluidically connected to the air inlet channel to pump the fluid in the air inlet channel; A water circulation system, comprising a cooling water tank and a condenser, wherein the cooling water tank is connected to the water ring vacuum pump to receive the fluid output by the three-stage pump system, and the cooling water tank is also provided with an external exhaust port for outputting gas, and the external exhaust port is provided at the top of the cooling water tank; the condenser comprises an internal circulation channel and an external circulation channel externally connected to the cooling water source, the internal circulation channel has an inlet and an outlet, the inlet is connected to the cooling water tank to receive the liquid in the cooling water tank, and the outlet is connected to the water ring vacuum pump to provide liquid to the water ring vacuum pump; and The pump cleaning system comprises a cleaning oil tank in fluid communication with the secondary vacuum pump, the cleaning oil tank is used to store cleaning oil, and a ball valve is arranged between the cleaning oil tank and the secondary vacuum pump.

2. The vacuum pumping device according to claim 1, characterized in that: Multiple layers of filter cotton are arranged between the air inlet and the air outlet of the filter tank.

3. The vacuum pumping device according to claim 1, characterized in that: A delivery pipeline is connected between the air intake channel and the secondary vacuum pump, and the delivery pipeline is externally connected to a pressure relief channel. A pneumatic angle seat valve and a pressure gauge for detecting the air pressure in the delivery pipeline are provided at the pressure relief channel. The pneumatic angle seat valve is used to block and connect the fluid connection between the pressure relief channel and the delivery pipeline.

4. The vacuum pumping device according to claim 3, characterized in that: The pressure gauge is connected to the controller signal of the pneumatic angle seat valve, and the controller is configured to control the operation of the pneumatic angle seat valve based on the detection result of the pressure gauge.

5. The vacuum pumping device according to claim 3, characterized in that: A pneumatic butterfly valve is arranged in the conveying pipeline, and the pneumatic butterfly valve is used to block and connect the fluid connection between the air inlet channel and the secondary vacuum pump. The pneumatic butterfly valve is located downstream of the pressure relief channel in the conveying pipeline.

6. The vacuum pumping device according to claim 1, characterized in that: The secondary vacuum pump and the primary vacuum pump as well as the primary vacuum pump and the water ring vacuum pump are fluidically connected via metal bellows.

7. The vacuum pumping device according to claim 1, characterized in that: The primary vacuum pump and the secondary vacuum pump are both Roots pumps.

8. The vacuum pumping device according to claim 1, characterized in that: The cooling water tank has a liquid outlet connected to the inlet of the inner circulation channel, and the liquid outlet is opened at the lower side of the outer emptying port.

9. The vacuum pumping device according to claim 1, characterized in that: The cooling water source is connected to the vacuum pumping device through an inlet pipe and a return pipe, the water inlet of the cooling channel and the water inlet of the external circulation channel are both connected to the inlet pipe, and the water outlet of the cooling channel and the water outlet of the external circulation channel are both connected to the return pipe.

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