CN115306740A - Vacuum unit used in explosion-proof environment - Google Patents

Vacuum unit used in explosion-proof environment Download PDF

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Publication number
CN115306740A
CN115306740A CN202211041054.3A CN202211041054A CN115306740A CN 115306740 A CN115306740 A CN 115306740A CN 202211041054 A CN202211041054 A CN 202211041054A CN 115306740 A CN115306740 A CN 115306740A
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CN
China
Prior art keywords
valve
explosion
proof
pipeline
vacuum
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Pending
Application number
CN202211041054.3A
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Chinese (zh)
Inventor
王萌
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Kyvac Technology Co ltd
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Kyvac Technology Co ltd
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Publication date
Application filed by Kyvac Technology Co ltd filed Critical Kyvac Technology Co ltd
Priority to CN202211041054.3A priority Critical patent/CN115306740A/en
Publication of CN115306740A publication Critical patent/CN115306740A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention discloses a vacuum unit used in an explosion-proof environment, which comprises a vacuum pumping system positioned in an explosion danger area and an equipment control system positioned in a safety area; the vacuum pumping system comprises a vacuum chamber, an explosion-proof box, a molecular pump, a mechanical pump, a main pumping valve, a backing valve, a side pumping valve, a high vacuum gauge and a low vacuum gauge, wherein the vacuum chamber is connected with a main pipeline and a bypass pipeline, the molecular pump, the high vacuum gauge and the low vacuum gauge are all positioned in the explosion-proof box, and the explosion-proof box is provided with an inert gas inlet and an inert gas outlet and is filled with inert gas; the equipment control system comprises a micro-positive pressure air inlet pipeline, an electrical control cabinet, a safety valve, a first filter, a stop valve and a pressure regulating valve, wherein the safety valve, the first filter, the stop valve and the pressure regulating valve are connected in series with the micro-positive pressure air inlet pipeline and are arranged in the electrical control cabinet, and the outlet end of the micro-positive pressure air inlet pipeline is connected with an inert gas inlet.

Description

Vacuum unit used in explosion-proof environment
Technical Field
The invention belongs to the technical field of vacuumizing devices, and particularly relates to a vacuum unit used in an explosion-proof environment.
Background
Hydrogen energy is used as a clean fuel and is regarded as the clean energy with the most development potential in the 21 st century, and as a fuel or an energy carrier, liquid hydrogen is the best way to use and store hydrogen. Because the conversion temperature of the hydrogen is very low, the maximum is 20.4K, and the hydrogen can be liquefied only by pre-cooling the hydrogen below the temperature, some key equipment (heat exchangers, purifiers and the like) and pipelines in the hydrogen gasification device need to be placed in a vacuum environment, and the heat conduction is reduced by adopting a vacuum heat insulation mode.
In the production process of liquid hydrogen, the danger of hydrogen leakage exists, when the volume concentration of hydrogen in the air is between 4.0% and 75.6%, the hydrogen can explode when meeting a fire source, and according to the design specification of an explosion-proof area, when an explosive gas mixture environment appears or possibly appears in the production, processing, treatment, transportation or storage processes, relevant equipment is subjected to explosion-proof design.
Therefore, the vacuum unit used in the explosion-proof environment is provided, and is used for vacuumizing and exhausting the hydrogen liquefying device system in the explosive gas environment through the explosion-proof design, so that necessary conditions are provided for the safe production of liquid hydrogen.
Disclosure of Invention
In view of the problems raised by the background art described above, the present invention has an object to: aims to provide a vacuum unit used in an explosion-proof environment.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a vacuum unit used in explosion-proof environment comprises a vacuum pumping system located in an explosion danger area and an equipment control system located in a safety area;
the vacuum pumping system comprises a vacuum chamber, an explosion-proof box, a molecular pump, a mechanical pump, a main pumping valve, a backing valve, a side pumping valve, a high vacuum gauge and a low vacuum gauge, wherein the vacuum chamber is connected with a main pipeline and a bypass pipeline, the main pumping valve, the molecular pump, the backing valve and the mechanical pump are sequentially connected in series on the main pipeline in sequence, one end of the bypass pipeline is connected with the vacuum chamber, the other end of the bypass pipeline is connected with a pipeline between the backing valve and the mechanical pump, the main pumping valve is close to the vacuum chamber, the high vacuum gauge is connected on the main pipeline before the inlet end of the main pumping valve, the low vacuum gauge is connected with the pipeline between the molecular pump and the backing valve, the side pumping valve is connected on the bypass pipeline, the molecular pump, the high vacuum gauge and the low vacuum gauge are all positioned in the explosion-proof box, and the explosion-proof box is provided with an inert gas inlet and an inert gas outlet and filled with inert gas;
the equipment control system comprises a micro-positive pressure air inlet pipeline, an electrical control cabinet, a safety valve, a first filter, a stop valve and a pressure regulating valve, wherein the safety valve, the first filter, the stop valve and the pressure regulating valve are connected in series with the micro-positive pressure air inlet pipeline and are arranged in the electrical control cabinet, and the outlet end of the micro-positive pressure air inlet pipeline is connected with an inert gas inlet.
Further prescribe a limit, be connected with cable circuit between electrical control cabinet and the explosion-proof box, such structural design supplies power and signal acquisition transmission through cable circuit.
Further, the pressure sensor is connected to the explosion-proof box, and the pressure of the inert gas in the explosion-proof box is monitored through the pressure sensor.
Further inject, explosion-proof box's inert gas outlet is connected with discharge valve, and such structural design can accomplish the pressure release through discharge valve when the atmospheric pressure in the explosion-proof box is greater than the assigned pressure.
Further inject, main valve, backing valve, other valve, the discharge valve of taking out all adopt two three way solenoid valves to commutate, two three way solenoid valves are integrated inside the electrical control cabinet, main valve, backing valve, other valve, the discharge valve of taking out all adopt explosion-proof micro-gap switch as feedback device, such structural design because main valve, backing valve, other valve, the discharge valve of taking out can't place in explosion-proof box, consequently, regard as explosion-proof design with two three way solenoid valves, explosion-proof micro-gap switch, make main valve, backing valve, other valve, discharge valve of taking out can reach explosion-proof requirement.
Further inject, the molecular pump is connected with inlet tube and outlet pipe, be connected with the second filter on the pipeline of inlet tube, be connected with the flowmeter on the pipeline of outlet pipe, inlet tube and outlet pipe all are connected with the ball valve, the flowmeter is located explosion-proof incasement portion, and such structural design is intake through the inlet tube, for the molecular pump provides the required cooling water of during operation, and the second filter is used for getting rid of the impurity of aquatic, and the flowmeter is used for detecting the molecular pump discharge, and the ball valve is used for controlling business turn over water.
Further, the mechanical pump adopts an explosion-proof motor, and the structural design enables the mechanical pump to meet the explosion-proof requirement.
Further inject, the inside integration of electrical control cabinet has the control power, electrical control cabinet connects the touch-sensitive screen, remote interface is reserved to the touch-sensitive screen, and such structural design realizes automatically controlled operation through the touch-sensitive screen, and the user of being convenient for through remote interface reads information, carries out remote control.
The invention has the beneficial effects that:
1. through a series of explosion-proof designs, necessary conditions are provided for the safe production of liquid hydrogen, for example, an equipment control system is placed in a safe area, a vacuum pumping system in the dangerous area adopts a mode that inert gas is introduced into an explosion-proof box to form a micro-positive pressure environment for explosion prevention, and corresponding explosion-proof improvement is also made on valve bodies which cannot be placed into the explosion-proof box;
2. the vacuum chamber is sequentially pumped into low vacuum and high vacuum through pre-pumping and main pumping, so that the vacuum pumping efficiency is high, and the vacuum degree is good;
3. simple structure, convenient processing and manufacturing, economy and practicality, high reliability and suitability for most explosion-proof environments.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic structural diagram of an embodiment of a vacuum unit used in an explosion-proof environment according to the present invention;
the main element symbols are as follows:
the vacuum chamber 1, the explosion-proof box 2, the molecular pump 3, the mechanical pump 4, the main pumping valve 5, the backing valve 6, the side pumping valve 7, the exhaust valve 8, the ball valve 9, the second filter 10, the high vacuum gauge 11, the low vacuum gauge 12, the pressure sensor 13, the flowmeter 14, the safety valve 15, the first filter 16, the stop valve 17, the pressure regulating valve 18 and the electrical control cabinet 19.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in fig. 1, the vacuum unit for explosion-proof environment of the present invention comprises a vacuum pumping system located in an explosion danger area and an equipment control system located in a safety area;
the vacuum pumping system comprises a vacuum chamber 1, an explosion-proof box 2, a molecular pump 3, a mechanical pump 4, a main pumping valve 5, a backing valve 6, a side pumping valve 7, a high vacuum gauge 11 and a low vacuum gauge 12, wherein the vacuum chamber 1 is connected with a main pipeline and a bypass pipeline, the main pumping valve 5, the molecular pump 3, the backing valve 6 and the mechanical pump 4 are sequentially connected in series on the main pipeline, one end of the bypass pipeline is connected with the vacuum chamber 1, the other end of the bypass pipeline is connected with a pipeline between the backing valve 6 and the mechanical pump 4, the main pumping valve 5 is close to the vacuum chamber 1, the high vacuum gauge 11 is connected on the main pipeline before the inlet end of the main pumping valve 5, the low vacuum gauge 12 is connected on the pipeline between the molecular pump 3 and the backing valve 6, the side pumping valve 7 is connected on the bypass pipeline, the molecular pump 3, the high vacuum gauge 11 and the low vacuum gauge 12 are all positioned in the explosion-proof box 2, and the explosion-proof box 2 is provided with an inert gas inlet and an inert gas outlet and filled with inert gas;
the equipment control system comprises a micro-positive pressure air inlet pipeline, an electrical control cabinet 19, a safety valve 15, a first filter 16, a stop valve 17 and a pressure regulating valve 18, wherein the safety valve 15, the first filter 16, the stop valve 17 and the pressure regulating valve 18 are connected in series with the micro-positive pressure air inlet pipeline and are arranged in the electrical control cabinet 19, and the outlet end of the micro-positive pressure air inlet pipeline is connected with an inert gas inlet.
In this embodiment, when the vacuum unit is actually applied, the vacuum unit may be designed to be skid-mounted, the lower end of the vacuum unit is provided with the roller, so that the vacuum unit is convenient to install and move, the integration level is higher, when the vacuum chamber 1 is vacuumized, the vacuum chamber is butted in a flange manner, and for convenience of connection, a section of corrugated pipe may be connected at the interface of the vacuum unit;
the invention relates to a vacuum unit used in an explosion-proof environment, which adopts a mode that a molecular pump 3 is connected with a mechanical pump 4 in series to ensure the vacuum degree of a vacuum chamber 1, wherein the molecular pump 3 and a main pumping valve 5 form a main pumping system, the mechanical pump 4 and a side pumping valve 7 form a pre-pumping system, the pre-pumping system firstly pumps the vacuum chamber 1 into low vacuum, and then the main pumping system pumps the vacuum chamber 1 into high vacuum;
the low vacuum gauge 12 detects the vacuum degree of an inlet of the mechanical pump 4, the high vacuum gauge 11 detects the vacuum degree of an inlet of the molecular pump 3, the high vacuum gauge 11 and the low vacuum gauge 12 are all positioned in the explosion-proof box 2, nitrogen from a micro-positive pressure air inlet pipeline is introduced into the explosion-proof box 2 through an inert gas inlet, so that the air pressure in the explosion-proof box 2 is in a micro-positive pressure state, and external dangerous gas is prevented from entering the explosion-proof box, so that the aim of explosion prevention is fulfilled;
the micro-positive pressure air inlet pipeline is connected with a safety valve 15, a first filter 16, a stop valve 17 and a pressure regulating valve 18, wherein the safety valve 15 is located at a nitrogen inlet to prevent the pressure from exceeding a set pressure, the pressure is automatically released when the pressure exceeds the set pressure, the first filter 16 is used for removing impurities and particles in an air source, the stop valve 17 is used for controlling air inlet, and the pressure regulating valve 18 is used for controlling air inlet pressure.
Preferably, a cable line is connected between the electrical control cabinet 19 and the explosion-proof box 2, and the structural design is that power supply and signal acquisition and transmission are carried out through the cable line. In fact, other signal transmission structures between the electrical control cabinet 19 and the explosion-proof box 2 can be specifically considered according to specific conditions.
Preferably, the explosion-proof box 2 is connected with a pressure sensor 13, and the structure is designed to monitor the pressure of the inert gas in the explosion-proof box 2 through the pressure sensor 13. In fact, other structures for monitoring the air pressure of the explosion proof tank 2 may be specifically considered according to specific situations.
Preferably, the inert gas outlet of the explosion-proof box 2 is connected with an exhaust valve 8, and the structure design can realize pressure relief through the exhaust valve 8 when the air pressure in the explosion-proof box 2 is higher than the specified pressure. In fact, other arrangements for avoiding overproof air pressures inside the explosion-proof tank 2 may also be specifically considered, depending on the specific circumstances.
Preferably, the main suction valve 5, the backing valve 6, the side suction valve 7 and the exhaust valve 8 all adopt two-position three-way electromagnetic valves for reversing, the two-position three-way electromagnetic valves are integrated inside the electrical control cabinet 19, and the main suction valve 5, the backing valve 6, the side suction valve 7 and the exhaust valve 8 all adopt explosion-proof micro switches as feedback devices, so that the structural design is adopted, because the main suction valve 5, the backing valve 6, the side suction valve 7 and the exhaust valve 8 cannot be placed in the explosion-proof box 2, therefore, the two-position three-way electromagnetic valves and the explosion-proof micro switches are used as explosion-proof designs, so that the main suction valve 5, the backing valve 6, the side suction valve 7 and the exhaust valve 8 can reach explosion-proof requirements. In fact, other explosion-proof structures of the main suction valve 5, the backing valve 6, the bypass suction valve 7 and the exhaust valve 8 can be specifically considered according to specific situations.
Preferably, molecular pump 3 is connected with inlet tube and outlet pipe, be connected with second filter 10 on the pipeline of inlet tube, be connected with flowmeter 14 on the pipeline of outlet pipe, inlet tube and outlet pipe all are connected with ball valve 9, flowmeter 14 is located 2 insides of explosion-proof box, such structural design, intake through the inlet tube, for molecular pump 3 provides the required cooling water of during operation, second filter 10 is used for getting rid of the impurity of aquatic, flowmeter 14 is used for detecting 3 water flow of molecular pump, ball valve 9 is used for controlling business turn over water. In fact, other configurations of supplying the molecular pump 3 with cooling water may be specifically considered as the case may be.
Preferably, the mechanical pump 4 adopts an explosion-proof motor, and the structural design enables the mechanical pump 4 to meet the explosion-proof requirement. In fact, other explosion-proof constructions of the mechanical pump 4 may also be specifically considered, depending on the specific case.
Preferably, a control power supply is integrated in the electrical control cabinet 19, the electrical control cabinet 19 is connected with the touch screen, and the touch screen is reserved with a remote interface. In fact, other configurations for performing the electrically controlled operation are specifically contemplated as appropriate.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. A vacuum unit for explosion-proof environment which characterized in that: comprises a vacuum pumping system positioned in an explosion danger area and an equipment control system positioned in a safe area;
the vacuum pumping system comprises a vacuum chamber (1), an explosion-proof box (2), a molecular pump (3), a mechanical pump (4), a main pumping valve (5), a backing valve (6), a side pumping valve (7), a high vacuum gauge (11) and a low vacuum gauge (12), wherein the vacuum chamber (1) is connected with a main pipeline and a bypass pipeline, the main pumping valve (5), the molecular pump (3), the backing valve (6) and the mechanical pump (4) are sequentially connected in series on the main pipeline, one end of the bypass pipeline is connected with the vacuum chamber (1), the other end of the bypass pipeline is connected with a pipeline between the backing valve (6) and the mechanical pump (4), the main pumping valve (5) is close to the vacuum chamber (1), the high vacuum gauge (11) is connected on the main pipeline before the inlet end of the main pumping valve (5), the low vacuum gauge (12) is connected on the pipeline between the molecular pump (3) and the backing valve (6), the side pumping valve (7) is connected on the bypass pipeline, the molecular pump (3), the high vacuum gauge (11) and the low vacuum gauge (12) are all located in the explosion-proof box (2), and an inert gas filling inlet and an inert gas filling outlet is arranged on the inert gas filling box (2);
the equipment control system comprises a micro-positive pressure air inlet pipeline, an electrical control cabinet (19), a safety valve (15), a first filter (16), a stop valve (17) and a pressure regulating valve (18), wherein the safety valve (15), the first filter (16), the stop valve (17) and the pressure regulating valve (18) are connected in series with the micro-positive pressure air inlet pipeline and are arranged in the electrical control cabinet (19), and the outlet end of the micro-positive pressure air inlet pipeline is connected with an inert gas inlet.
2. The vacuum unit used in the explosion-proof environment according to claim 1, characterized in that: and a cable line is connected between the electrical control cabinet (19) and the explosion-proof box (2).
3. The vacuum unit for the explosion-proof environment according to claim 2, wherein: the explosion-proof box (2) is connected with a pressure sensor (13).
4. A vacuum unit for use in explosion-proof environments according to claim 3, wherein: an inert gas outlet of the explosion-proof box (2) is connected with an exhaust valve (8).
5. A vacuum unit for use in explosion-proof environments according to claim 4, wherein: the main pumping valve (5), the preceding stage valve (6), the side pumping valve (7) and the exhaust valve (8) are all reversed by adopting two three-way electromagnetic valves, the two three-way electromagnetic valves are integrated inside the electrical control cabinet (19), and the main pumping valve (5), the preceding stage valve (6), the side pumping valve (7) and the exhaust valve (8) all adopt an explosion-proof microswitch as a feedback device.
6. A vacuum unit for use in explosion-proof environments according to claim 2, wherein: the molecular pump (3) is connected with inlet tube and outlet pipe, be connected with second filter (10) on the pipeline of inlet tube, be connected with flowmeter (14) on the pipeline of outlet pipe, inlet tube and outlet pipe all are connected with ball valve (9), flowmeter (14) are located explosion-proof box (2) inside.
7. The vacuum unit for the explosion-proof environment according to claim 2, wherein: the mechanical pump (4) adopts an explosion-proof motor.
8. A vacuum unit for use in explosion-proof environments according to claim 2, wherein: the control power supply is integrated in the electrical control cabinet (19), the electrical control cabinet (19) is connected with the touch screen, and a remote interface is reserved in the touch screen.
CN202211041054.3A 2022-08-29 2022-08-29 Vacuum unit used in explosion-proof environment Pending CN115306740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211041054.3A CN115306740A (en) 2022-08-29 2022-08-29 Vacuum unit used in explosion-proof environment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211041054.3A CN115306740A (en) 2022-08-29 2022-08-29 Vacuum unit used in explosion-proof environment

Publications (1)

Publication Number Publication Date
CN115306740A true CN115306740A (en) 2022-11-08

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ID=83864369

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211041054.3A Pending CN115306740A (en) 2022-08-29 2022-08-29 Vacuum unit used in explosion-proof environment

Country Status (1)

Country Link
CN (1) CN115306740A (en)

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