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Vacuum extraction method and device

A vacuum device and vacuum technology, applied in liquid variable capacity machinery, machines/engines, mechanical equipment, etc., can solve the problems of external pollution of lubricating oil system, high performance requirements of exhaust valves, harmful voids, etc., and reduce cavitation. effect of the phenomenon

Inactive Publication Date: 2014-01-01
刘庆明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The piston and cylinder of the mechanical reciprocating vacuum pump have mechanical friction and are easy to wear during operation, the body temperature rises faster and the noise is louder; the performance requirements of the suction and exhaust valves are high and there are harmful gaps, which also restrict the ultimate vacuum of the mechanical reciprocating vacuum pump. and efficiency, and the lubricating oil system used has problems such as external pollution; due to the limitation of mechanical structure characteristics of water ring pumps and mechanical reciprocating vacuum pumps, it is difficult to make a single machine with super large suction capacity, and it is difficult to be competent for gas-liquid co-suction

Method used

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  • Vacuum extraction method and device

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Experimental program
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Effect test

Embodiment 1

[0082] Such as figure 1 As shown in , the vacuum extraction system in this embodiment includes: a vacuum extraction device and a vacuum device 22 to be vacuumed. The vacuum extraction device includes: two sealed pressure vessels 13 and 14 with equal volumes, and a working fluid circulation device for circulating the working fluid between the two pressure vessels.

[0083] The airtight pressure vessel is provided with a suction port for sucking gas from the vacuum device to be evacuated, an exhaust port for discharging the sucked gas, a liquid injection port for injecting the working liquid and a discharge port for discharging the working liquid. drain port. The above-mentioned suction port, exhaust port, liquid injection port, and liquid discharge port can be separately arranged on the airtight pressure vessel, and can also be as shown in this embodiment and the following examples: suction port, exhaust port Combined on one port, the liquid injection port and the liquid disc...

Embodiment 2

[0098] Such as image 3 As shown in , compared with Embodiment 1, the structure of the vacuum pumping system in this embodiment differs in that the working liquid circulation device in this embodiment includes: a one-way liquid pump 20 and a reversing device 19; The device 19 is composed of four solenoid valves 19a-19d arranged in parallel, wherein the valves 19a, 19b are arranged in the same direction, and the valves 19c, 19d are arranged in the same direction but opposite to the valves 19a, 19b. A working state of the working liquid circulation device is: the working liquid flows out from the airtight pressure vessel 13, and then enters the one-way liquid pump 20 through the electromagnetic valve 19a, the liquid filter 18, and the heat exchanger 21, and then enters the airtight pressure vessel 19c through the electromagnetic valve 19c. In the pressure vessel 14; another working state is that the working fluid flows out from the airtight pressure vessel 14, and enters the air...

Embodiment 3

[0101] Such as Figure 4 As shown in , the structure of the vacuum extraction system in this embodiment is basically the same as the vacuum extraction system in Embodiment 2, the difference is that: the cooling device includes two heat exchange devices 113, 114, and the two heat exchange devices The devices 113, 114 are respectively arranged on the two airtight pressure vessels 13, 14. The heat exchanger is directly installed on the airtight pressure vessel. The advantage is that the cooling device cools down the working liquid and at the same time strengthens the cooling of the pumped gas, which is beneficial to capture the pumped gas molecules. This method is especially suitable for pumping Such as water vapor and other gases with condensing properties. The vacuum extraction system in this embodiment is especially suitable for use in the field of vacuum cooling and modified atmosphere preservation.

[0102] It should be noted that the cooling device and the liquid filter i...

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Abstract

The invention discloses a vacuum extraction method and a vacuum extraction device. In the method, an enclosed pressure vessel is taken as a gas extracting device; a negative pressure space is formed in the enclosed pressure vessel by discharging working liquid in the enclosed pressure vessel, and gas in a vacuum device to be vacuumized is extracted by the negative pressure space, so that a required vacuum degree can be achieved by the vacuum device. Compared with the conventional mechanically-reciprocating vacuum pump, the vacuum extraction device is not provided with a metal friction surface, and the inside of a pump is not required to be lubricated, so that the greasy dirt of lubricating oil is prevented from polluting a surrounding environment, and the vacuum extraction device has low noise and large extraction volume in operation. At the same time, under the condition that the working liquid is fully filled in the enclosed pressure vessel, a limit vacuum degree and working efficiency which can be achieved can be effectively improved; in addition, the working liquid is operated in an enclosed system and has low loss, so that the working liquid is not required to be continuously supplied in the working process.

Description

technical field [0001] The invention relates to a vacuum extraction method and a vacuum extraction device. Background technique [0002] Because the water ring pump has the advantages of being able to extract condensable gases [such as water vapor], it is widely used in various rough vacuum fields. However, the general water ring pump is limited by the saturated vapor pressure of water. When water is used as the working fluid, the limit pressure of the water ring pump is about 2000-4000 Pa, and when oil is used as the working fluid, it can reach 130 Pa. The efficiency of the water ring pump is very low because the impeller stirs the liquid during operation and loses a lot of energy. Generally, the efficiency of the water ring pump is 30%-50%, and the water ring pump needs to continuously replenish the working fluid to consume a large amount of water during operation. The mechanical reciprocating vacuum pump is also a variable capacity vacuum pump. It uses the piston to rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B37/14
Inventor 刘庆明
Owner 刘庆明