CN111980919A - Vacuum pump with multistage roots structure for oil gas recovery - Google Patents

Vacuum pump with multistage roots structure for oil gas recovery Download PDF

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Publication number
CN111980919A
CN111980919A CN202011017454.1A CN202011017454A CN111980919A CN 111980919 A CN111980919 A CN 111980919A CN 202011017454 A CN202011017454 A CN 202011017454A CN 111980919 A CN111980919 A CN 111980919A
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CN
China
Prior art keywords
pump body
vacuum pump
roots
air outlet
check valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011017454.1A
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Chinese (zh)
Inventor
吴进卿
张利刚
王书见
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Luoyang Priman Environmental Protection Technology Co ltd
Original Assignee
Luoyang Priman Environmental Protection Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Luoyang Priman Environmental Protection Technology Co ltd filed Critical Luoyang Priman Environmental Protection Technology Co ltd
Priority to CN202011017454.1A priority Critical patent/CN111980919A/en
Publication of CN111980919A publication Critical patent/CN111980919A/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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
    • F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

A vacuum pump with a multistage Roots structure for oil gas recovery comprises a pump body provided with an air inlet and an air outlet, two rotors rotatably mounted in an inner cavity of the pump body, gears respectively mounted at the end parts of the rotors, one of the gears serving as a driving wheel and the other serving as a driven wheel and driving the two rotors to perform mutually reverse synchronous rotary motion during rotation, a gear box mounted on the gears, four Roots blades respectively mounted on each rotor, a first reverse stop mechanism mounted on the air inlet of the pump body, and a second reverse stop mechanism mounted on the air outlet of the pump body; the pump body of the invention adopts a four-stage compression mode, the compression ratio of each stage is different and is in a stage-by-stage increasing state, when in use, the vacuum pump does not need to be matched with a backing pump, and the vacuum degree and the gas output of the vacuum pump can be obviously improved; in addition, the vacuum pump can effectively avoid the problem of shutdown and pressure relief by additionally arranging a first reverse stop mechanism and a second reverse stop mechanism.

Description

Vacuum pump with multistage roots structure for oil gas recovery
Technical Field
The invention relates to the technical field of air compressors, in particular to a vacuum pump with a multi-stage roots structure for oil and gas recovery.
Background
The existing Roots vacuum pump has low compression ratio and high failure rate, and can reach high vacuum degree only by matching with a backing pump; and the pump body of the conventional Roots vacuum pump is generally manufactured and processed by adopting a cast iron process, and is limited by the process, and the pump body manufactured by the process has the defects of slag inclusion, air hole leakage and the like.
Disclosure of Invention
Aiming at the defects of the existing device, the invention aims to provide a vacuum pump with a multi-stage roots structure for oil and gas recovery.
The purpose of the invention is realized by adopting the following technical scheme. The invention provides a vacuum pump with a multistage Roots structure for oil gas recovery, which comprises a pump body provided with an air inlet and an air outlet, two rotors rotatably arranged in an inner cavity of the pump body, gears which are respectively arranged at the end parts of the rotors and one of the two rotors is used as a driving wheel and the other is used as a driven wheel and drives the two rotors to perform mutually reverse synchronous rotary motion when rotating, a gear box arranged on the gears, four Roots blades respectively arranged on the rotors, a first reverse stop mechanism arranged on the air inlet of the pump body, and a second reverse stop mechanism arranged on the air outlet of the pump body.
Preferably, the end of one of the rotors is provided with a heat dissipation fan blade through a coupler, and a fan blade cover is arranged outside the heat dissipation fan blade.
Preferably, the Roots blade is of a three-blade structure.
Preferably, the thickness of the four Roots blades mounted on each rotor decreases progressively in the direction from the gas inlet to the gas outlet.
Preferably, the first reverse stop mechanism comprises a first check valve, an air inlet flange and a first sealing ring, wherein the first check valve is sequentially arranged on the air inlet of the pump body, communicated with the inner cavity of the pump body and capable of enabling air to flow in a one-way mode, the air inlet flange is arranged on the first check valve and communicated with the first check valve, and the first sealing ring is arranged on the contact surface of the first check valve and the air inlet flange.
Preferably, a flame arrester is mounted in the air inlet flange.
Preferably, the second reverse stop mechanism comprises an air outlet base, a second check valve and an air outlet flange, wherein the air outlet base is sequentially arranged at the air outlet of the pump body and communicated with the cavity in the pump body, the second check valve enables air to flow in a one-way mode, and a second sealing ring is arranged on the contact surface of the second check valve and the air outlet flange.
The vacuum pump with the multi-stage Roots structure for oil gas recovery provided by the invention has the following advantages:
1. the pump body of the invention adopts a four-stage compression mode, the compression ratio of each stage is different and is in a stage-by-stage increasing state, when in use, the vacuum pump does not need to be matched with a backing pump, and the vacuum degree and the gas output of the vacuum pump can be obviously improved.
2. According to the vacuum pump, the first reverse stop mechanism and the second reverse stop mechanism are additionally arranged, so that the problem of stopping and pressure relief can be effectively solved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic perspective view of a vacuum pump with a multi-stage roots structure for oil and gas recovery according to the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a front view of fig. 1.
Fig. 4 is a top view of fig. 1.
Fig. 5 is a cross-sectional view taken at a-a in fig. 4.
Fig. 6 is a cross-sectional view at B-B in fig. 3.
Fig. 7 is a perspective view of fig. 1.
Fig. 8 is a schematic structural view of the roots blade in the present embodiment.
Fig. 9 is a front view of fig. 8.
Fig. 10 is a schematic perspective view of the first reverse blocking mechanism in this embodiment.
Fig. 11 is a cross-sectional view of fig. 10.
Fig. 12 is a schematic perspective view of the second reverse blocking mechanism in this embodiment.
Fig. 13 is a cross-sectional view of fig. 12.
Detailed Description
The present invention provides a vacuum pump with a multi-stage roots structure for oil gas recovery, which is described in detail below with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 13, the vacuum pump with a multi-stage roots structure for oil gas recovery according to the present invention includes a pump body 5 having an air inlet at the top and an air outlet at the bottom, two rotors rotatably mounted in an inner cavity of the pump body 5 and mounted on a pair of parallel shafts, a gear 7 mounted at any end of each rotor, the two gears being engaged with each other, one of the gears serving as a driving wheel and the other serving as a driven wheel, wherein when the driving wheel moves, the driven wheel is driven to rotate and simultaneously the two rotors are driven to perform mutually opposite synchronous rotational movements, so as to push and press the moving air to achieve the purpose of air suction. The outer side of the gear 7 is provided with a gear box 2, the gear box is arranged at the end part of the pump body 5, the end part of any one rotor penetrates through the gear box and is provided with a heat dissipation fan blade 9 through a coupler 8, and the outer side of the heat dissipation fan blade 9 is provided with a fan blade cover 1.
The four Roots blades 6 are arranged on each rotor and comprise a first Roots blade 61, a second Roots blade 62, a third Roots blade 63 and a fourth Roots blade 64 which are sequentially arranged on the rotors from the gas inlet direction to the gas outlet direction, each Roots blade 6 is of a three-blade structure, each blade of each Roots blade is formed by three sections of standard circular arcs R1, R2 and R3 in smooth transition, the included angle between every two adjacent blades of the three Roots blades is 120 degrees, the Roots blade of the structure is easy to control in machining precision and can enable every two adjacent blades to be meshed more smoothly; four gas compression cavities which are sequentially communicated are respectively formed between the four Roots blades on each rotor and the inner wall of the pump body, namely a primary compression cavity 65 is formed between the first Roots blade 61 and the inner wall of the pump body, a secondary compression cavity 66 is formed between the second Roots blade 62 and the inner wall of the pump body, a third-stage compression cavity 67 is formed between the third Roots blade 63 and the inner wall of the pump body, and a fourth-stage compression cavity 68 is formed between the fourth Roots blade 64 and the inner wall of the pump body;
when the rotor 6 rotates ceaselessly, the pumped body is sucked into a gas compression cavity between the rotor 6 and the pump body 5 from a gas inlet of the pump body and then discharged from a gas outlet, the Roots blade and the inner wall of the pump body are not contacted with each other and keep small gaps to ensure that the Roots blade and the Roots blade can run at high speed, and the small gap is 0.09 mm;
referring to fig. 6, 7 and 9, the first roots blade, the second roots blade, the third roots blade and the fourth roots blade have different blade thicknesses and are in a sequentially decreasing state, when the roots blades are driven by the rotors to rotate, the four roots blades with different thicknesses mounted on each rotor enable the gas in the four gas compression cavities to generate different compression ratios, and the compression ratios of the gas in the primary compression cavity, the secondary compression cavity, the tertiary compression cavity and the quaternary compression cavity are sequentially in an increasing state.
The compression ratio of each level is different and is the increasing state step by step from the air inlet direction to the gas outlet direction in proper order, and the roots blade of this structure can make the vacuum pump under the supplementary condition of backing pump that does not need, can play the effect that vacuum degree and gas output are showing to be increased equally. The test shows that when the rotation speed of the rotor is 3000 r/min, the vacuum degree is-0.094 MPa, and the air extraction amount of the vacuum pump in the embodiment is 11m3The vacuum pump outlet pressure in this example is 0.18 Kpa.
Be equipped with first reverse stop mechanism 3 on the air inlet of the pump body 5, be equipped with the reverse stop mechanism 4 of second on the gas outlet of the pump body 5, first reverse stop mechanism 3 and the reverse stop mechanism 4 of second can effectively avoid the vacuum pump to relieve pressure when shutting down.
Referring to fig. 10 and 11, the first reverse blocking mechanism 3 includes a first check valve installed on the air inlet of the pump body and an air inlet flange 301 communicated with the first check valve; first check valve includes the valve gap 305 of admitting air, install the first check piece 304 in the valve gap 305 of admitting air, first check piece 304 is in the open mode when gaseous from the cavity of the flange flow direction pump body of admitting air in, be in the closed mode when gaseous from the cavity flow direction flange of the pump body of admitting air, thereby realize gaseous one-way circulation and can prevent gaseous backward flow again, the flange installation that admits air keeps away from first one-way to the tip of contrary piece at the valve gap, install first sealing washer 303 on the contact surface of valve gap 5 of admitting air and admitting air flange 1, first sealing washer 303 is the O type, it has back-fire relief device 302 to admit air flange 301 embeds, under special circumstances, the back-fire relief device can prevent that outside flame or high temperature oil gas burning in the pump from spilling over, play two-way (import, export) fire-retardant effect.
Referring to fig. 12 and 13, the second reverse blocking mechanism 4 includes an air outlet base 404, a second check valve and an air outlet flange 401 sequentially installed at the air outlet of the pump body and communicated with the cavity in the pump body, the second check valve includes an air outlet valve cover 403 installed on the air outlet base and a second check sheet 402 installed in the air outlet valve cover 403, the second check sheet 402 is in an open state when air flows from the air outlet base to the initial flange and is in a closed state when air flows in a reverse direction, so that unidirectional air flow and backflow prevention are achieved, a second sealing ring 405 is installed on a contact surface between the air outlet valve cover 403 and the air outlet flange 401, and the second sealing ring 405 is in an O shape.
The pump body 5 is processed by a die-casting aluminum process, and the vacuum pump is made of 304 stainless steel or magnesium aluminum alloy, so that the explosion-proof requirement of the vacuum pump is met.
The above description is only a preferred embodiment of the present invention, and any simple modification, equivalent change and modification made by those skilled in the art according to the technical essence of the present invention are within the technical scope of the present invention.

Claims (7)

1. The utility model provides a vacuum pump of multistage roots structure for vapor recovery system which characterized in that: the device comprises a pump body provided with an air inlet and an air outlet, two rotors rotatably arranged in an inner cavity of the pump body, gears which are respectively arranged at the end part of each rotor and one of the rotors is used as a driving wheel, the other rotor is used as a driven wheel and drives the two rotors to perform mutually reverse synchronous rotary motion when rotating, a gear box arranged on the gears, four Roots blades respectively arranged on each rotor, a first reverse stop mechanism arranged on the air inlet of the pump body and a second reverse stop mechanism arranged on the air outlet of the pump body.
2. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 1, wherein: the end part of one of the rotors is provided with a heat dissipation fan blade through a coupler, and the outer side of the heat dissipation fan blade is provided with a fan blade cover.
3. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 1, wherein: the Roots blade is of a three-blade structure.
4. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 1, wherein: the thickness of the four Roots blades arranged on each rotor is gradually reduced along the direction from the air inlet to the air outlet.
5. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 1, wherein: the first reverse stop mechanism comprises a first check valve, an air inlet flange and a first sealing ring, wherein the first check valve is sequentially arranged on an air inlet of the pump body and communicated with an inner cavity of the pump body, and the first check valve can enable air to flow in a one-way mode, the air inlet flange is arranged on the first check valve and communicated with the first check valve, and the first sealing ring is arranged on the contact surface of the first check valve and the air inlet flange.
6. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 5, wherein: a flame arrester is arranged in the air inlet flange.
7. The vacuum pump of multistage roots structure for oil and gas recovery as set forth in claim 1, wherein: the second reverse stop mechanism comprises an air outlet base, a second check valve and an air outlet flange, wherein the air outlet base is sequentially arranged at an air outlet of the pump body and communicated with a cavity in the pump body, the second check valve enables air to flow in a one-way mode, and a second sealing ring is arranged on the contact surface of the second check valve and the air outlet flange.
CN202011017454.1A 2020-09-24 2020-09-24 Vacuum pump with multistage roots structure for oil gas recovery Pending CN111980919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011017454.1A CN111980919A (en) 2020-09-24 2020-09-24 Vacuum pump with multistage roots structure for oil gas recovery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011017454.1A CN111980919A (en) 2020-09-24 2020-09-24 Vacuum pump with multistage roots structure for oil gas recovery

Publications (1)

Publication Number Publication Date
CN111980919A true CN111980919A (en) 2020-11-24

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ID=73450266

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011017454.1A Pending CN111980919A (en) 2020-09-24 2020-09-24 Vacuum pump with multistage roots structure for oil gas recovery

Country Status (1)

Country Link
CN (1) CN111980919A (en)

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