Vacuum pump station based on plasticizing infiltration process

Abstract

The utility model discloses a vacuum pump station based on plasticization infiltration process, which relates to the technical field of biological plasticization, and comprises a plurality of vacuum boxes, the plurality of vacuum boxes are converged on a second pipeline through a first pipeline, the second pipeline is connected with an inlet of a buffer tank, and a third pipeline is arranged at an outlet of the buffer tank. A roots pump and a reciprocating vacuum pump are sequentially arranged on the third pipeline, and an exhaust pipe is arranged at the tail end of the third pipeline. According to the vacuum pump station, a plurality of box bodies are connected in parallel into a whole to form a pump station to work, an original rotary vane vacuum pump is replaced with a reciprocating vacuum pump and a roots pump set, the vacuum degree of a system is remarkably improved, and oil consumption of the vacuum pump is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bioplastics, in particular to a vacuum pump station based on a plasticizing infiltration process. Background Art

[0002] In the infiltration process of the bioplastics technology, a vacuum device is required to pump the air and residual organic solvents immersed in the vacuum chamber to the outside of the chamber. The gas extracted by the vacuum pump contains a large amount of organic solvents and silica gel particles, which will react with the pump oil, resulting in a decrease in sealing performance and lubricity, and ultimately insufficient vacuum degree. In the initial stage of the infiltration process, the oil needs to be changed every 24 hours of operation, and the vacuum pump needs to be cleaned every two months. The existing process is that one rotary vane vacuum pump is equipped for each chamber to pump vacuum. Although it is convenient to operate with a single vacuum pump for a single infiltration chamber, there is a waste phenomenon in terms of comprehensive benefits.

[0003] Therefore, the utility model proposes a vacuum pump station in which multiple chambers are connected in parallel to form a pumping station for operation, and the original rotary vane vacuum pump is replaced with a reciprocating vacuum pump and a Roots pump set, significantly improving the system vacuum degree and reducing the consumption of vacuum pump oil. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and a vacuum pump station based on a plasticizing infiltration process is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A vacuum pump station based on a plasticizing infiltration process includes a number of vacuum chambers. The vacuum chambers converge on a second pipeline through a first pipeline. The second pipeline is connected to the inlet of a buffer tank. A third pipeline is provided at the outlet of the buffer tank. A Roots pump and a reciprocating vacuum pump are sequentially arranged on the third pipeline. An exhaust pipe is provided at the end of the third pipeline.

[0007] Furthermore, a first bypass valve is provided on the first pipeline, and an electric valve is connected in parallel on the bypass valve of the first pipeline.

[0008] Furthermore, a fifth pipeline is provided at the bottom of the buffer tank. An on-line sewage discharger is provided on the fifth pipeline. Exhaust valves are provided on both the top of the buffer tank and the fifth pipeline.

[0009] Furthermore, a fourth pipeline is connected in parallel on the third pipeline. A Roots pump and a reciprocating vacuum pump are sequentially arranged on the fourth pipeline. A second bypass valve is provided at the starting section of the fourth pipeline.

[0010] Furthermore, an electric valve is connected in parallel on the second bypass valve.

[0011] Beneficial effects

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: By the arrangement of the present utility model, a vacuum pump station is proposed, in which multiple boxes are connected in parallel to form a pumping station for operation, and the original rotary vane vacuum pump is replaced with a reciprocating vacuum pump and a Roots pump set, significantly improving the system vacuum degree and reducing the consumption of vacuum pump oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model.

[0014] Figure 1 It is a schematic diagram of the overall structure of a vacuum pump station based on the plasticizing impregnation process.

[0015] Figure 2 It is a schematic diagram of the structure of a vacuum pumping system in the prior art.

[0016] In the figure: 1. First pipeline; 2. Second pipeline; 3. Buffer tank; 4. Fourth pipeline; 5. Roots pump; 6. Reciprocating vacuum pump; 7. Third pipeline: 8. Fifth pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0019] Refer to Figure 1 , a vacuum pump station based on the plasticizing impregnation process includes a number of vacuum boxes. The number of vacuum boxes converge on the second pipeline 2 through the first pipeline 1. The second pipeline 2 is connected to the inlet of the buffer tank 3. A third pipeline 7 is provided at the outlet of the buffer tank 3. A Roots pump 5 and a reciprocating vacuum pump 6 are sequentially arranged on the third pipeline 7. An exhaust pipe is provided at the end of the third pipeline 7.

[0020] Among them, the main components of the reciprocating vacuum pump 6 are the cylinder and the piston that makes reciprocating linear motion therein. When the pump is running, driven by the electric motor, the piston in the cylinder makes reciprocating motion through the action of the crank connecting rod mechanism. When the piston moves from the left end to the right end in the cylinder, due to the continuous increase in the volume of the left cavity of the cylinder, the density of the gas in the cylinder decreases, forming an air extraction process. At this time, the gas in the container enters the left cavity of the pump body through the suction valve. When the piston reaches the right position, the cylinder is filled with gas. Then the piston moves from the right end to the left end. At this time, the suction valve closes, and the gas in the cylinder is gradually compressed as the piston moves from right to left. When the pressure of the gas in the cylinder reaches or is slightly greater than one atmospheric pressure, the exhaust valve is opened, and the gas is discharged into the atmosphere, completing a working cycle.

[0021] The Roots pump 5 is equipped with two leaf-shaped rotors that rotate synchronously in opposite directions. There are small gaps between the rotors and between the rotors and the inner wall of the pump housing, and they do not contact each other. Due to the continuous rotation of the rotors, the gas to be pumped is sucked into the space between the rotor and the pump housing from the inlet, and then discharged through the exhaust port. After suction, the space is in a completely closed state, so the gas in the pump cavity is not compressed or expanded. However, when the top of the rotor turns past the edge of the exhaust port and the space communicates with the exhaust side, due to the relatively high gas pressure on the exhaust side, a part of the gas will rush back into the space, causing the gas pressure to suddenly increase. When the rotor continues to rotate, the gas is discharged outside the pump.

[0022] As a backing pump, the reciprocating vacuum pump 6 first pumps out a large amount of gas in the system, reducing the pressure in the container or system to be pumped, and creating a relatively low initial pressure environment for the subsequent work of the Roots pump 5. It has the characteristic of a large pumping volume and can quickly pump out most of the gas, but the ultimate vacuum degree it can reach is relatively low.

[0023] As a secondary pump, the Roots pump 5 further improves the vacuum degree on the basis of the initial air extraction and pressure reduction by the reciprocating vacuum pump 6. The characteristics of the Roots pump 5 are fast startup, low power consumption, low operation and maintenance costs, not sensitive to a small amount of water vapor and dust contained in the gas to be pumped, and having a large pumping rate within a certain pressure range. However, when it works alone, due to the low compression ratio, it cannot directly start pumping from atmospheric pressure and requires a backing pump to provide a certain degree of pre-vacuum.

[0024] In other preferred embodiments, a first bypass valve is provided on the first pipeline 1, and an electric valve is connected in parallel on the first pipeline 1.

[0025] In other preferred embodiments, a fifth pipeline is provided at the bottom of the buffer tank 3, an on-line sewage discharger is provided on the fifth pipeline, and exhaust valves are provided on both the top of the buffer tank 3 and the fifth pipeline.

[0026] In other preferred embodiments, a fourth pipeline 4 is arranged in parallel on the third pipeline 7. A Roots pump 5 and a reciprocating vacuum pump 6 are sequentially arranged on the fourth pipeline 4. A second bypass valve is arranged at the starting section of the fourth pipeline 4, and an electric valve is arranged in parallel on the second bypass valve.

[0027] With the above structure, when in use, first start the reciprocating vacuum pump on the third pipeline 7, and then open the valves on the pipeline in sequence until the vacuum chamber that needs to be evacuated, evacuate the air in the system to below 3000 Kpa, and then start the Roots vacuum pump on the third pipeline 7. The system can be manually operated or automatically set. The second pump set on the fourth pipeline 4 is used as a standby pump set. The system buffer tank is configured with an on-line sewage discharge design, and on-line sewage discharge can be realized without shutting down the machine.

[0028] The working principle and usage process of the present utility model:

[0029] Pressure matching: The reciprocating vacuum pump 6 first reduces the system pressure to the pressure range in which the Roots pump 5 can start and operate normally. The reciprocating vacuum pump 6 undertakes most of the rough pumping work, so that the system pressure quickly drops to the pressure range in which the Roots pump 5 can effectively operate. In this way, the Roots pump 5 can smoothly start to further compress and discharge the gas, improving the vacuum degree of the system.

[0030] Complementary pumping speed: The reciprocating vacuum pump 6 has a large pumping volume, but the pumping speed drops rapidly at high vacuum degrees; while the Roots pump 5 can maintain a relatively high pumping speed in the medium and high vacuum degree range. After the two are coupled, a relatively high pumping efficiency can be maintained throughout the pumping process from low vacuum degree to high vacuum degree, realizing the complementarity of the pumping speed.

[0031] Gas transmission relay: The reciprocating vacuum pump 6 extracts and discharges the gas from the container to be evacuated, providing a stable gas source for the Roots pump 5. The rotor of the Roots pump 5 rotates to suck in the gas from the intake port and compress it, and then discharges it to a higher pressure area, relaying the pumping process of the reciprocating vacuum pump 6, so that the gas can be continuously extracted from the system, and finally the higher vacuum degree requirement is achieved. Since the gas of this type is not in direct contact with the lubricating oil in the pump, the consumption of the vacuum pump oil is greatly reduced.

[0032] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A vacuum pump station based on a plasticizing infiltration process, characterized in that, It includes several vacuum chambers. Several of the vacuum chambers converge on a second pipeline through a first pipeline. The second pipeline is connected to the inlet of a buffer tank. A third pipeline is provided at the outlet of the buffer tank. A Roots pump and a reciprocating vacuum pump are sequentially arranged on the third pipeline. An exhaust pipe is provided at the end of the third pipeline.

2. The vacuum pump station based on the plasticizing infiltration process according to claim 1, characterized in that, A first bypass valve is provided on the first pipeline, and an electric valve is connected in parallel on the bypass valve of the first pipeline.

3. The vacuum pump station based on the plasticizing infiltration process according to claim 1, characterized in that, A fifth pipeline is provided at the bottom of the buffer tank. An on-line sewage discharger is provided on the fifth pipeline. Exhaust valves are provided on both the top of the buffer tank and the fifth pipeline.

4. The vacuum pump station based on the plasticizing infiltration process according to claim 1, characterized in that, A fourth pipeline is connected in parallel on the third pipeline. A Roots pump and a reciprocating vacuum pump are sequentially arranged on the fourth pipeline. A second bypass valve is provided at the starting section of the fourth pipeline.

5. The vacuum pump station based on the plasticizing infiltration process according to claim 4, characterized in that, An electric valve is connected in parallel on the second bypass valve.

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