CN212376872U

CN212376872U - Vacuum pump with multistage roots structure for oil gas recovery

Info

Publication number: CN212376872U
Application number: CN202022118326.8U
Authority: CN
Inventors: 吴进卿; 张利刚; 王书见
Original assignee: Luoyang Priman Environmental Protection Technology Co ltd
Current assignee: Luoyang Priman Environmental Protection Technology Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-01-19
Anticipated expiration: 2030-09-24

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 utility model discloses a pump body adopts the level four compression mode, and the compression ratio of each level is different and is the state that increases step by step, and this vacuum pump not only need not to use with the backing pump cooperation when using, and can also show the vacuum and the air output that improve the vacuum pump; 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 utility model relates to an air compressor technical field, concretely relates to oil gas recovery is with vacuum pump of multistage roots structure.

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.

SUMMERY OF THE UTILITY MODEL

To the not enough of current device, the utility model aims to provide a vacuum pump of multistage roots structure is used in oil gas recovery.

The utility model aims at adopting the following technical scheme to realize. The basis the utility model provides a vacuum pump of multistage roots structure for vapor recovery system, including the pump body that is equipped with air inlet and gas outlet, rotationally install two rotors of the inner chamber of the pump body, install respectively at every rotor tip and one of them as the action wheel, another as from the driving wheel and drive two rotors when rotating and be the gear of reverse synchronous revolution each other, install the gear box on the gear, install four roots's blade on every rotor respectively, install the first reverse stop mechanism on pump body air inlet, install the reverse stop mechanism of second on pump body gas outlet.

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 utility model provides a pair of vacuum pump of multistage roots structure for vapor recovery has following advantage:

1. the utility model discloses a pump body adopts the level four compression mode, and the compression ratio of each level is different and is the increase state step by step, and this vacuum pump not only need not to use with the backing pump cooperation when using to can also show the vacuum and the air output that improve the vacuum pump.

2. The utility model discloses a vacuum pump can avoid shutting down the problem of pressure release effectively through addding first reverse stop mechanism and the reverse stop mechanism of second.

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 according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic perspective view of the vacuum pump with a multi-stage roots structure for oil gas recovery of 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.

3 fig. 3 5 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 a 3- 3 a 3 in 3 fig. 3 4 3. 3

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 vacuum pump with a multi-stage roots structure for oil gas recovery according to the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

Please refer to fig. 1 to 13, the utility model provides a vacuum pump of multistage roots structure for oil gas recovery, including the top be equipped with the air inlet, the bottom is equipped with the pump body 5 of gas outlet, two rotors are rotationally installed to the inner chamber of the pump body 5, two rotors are installed on a pair of parallel shaft, gear 7 is all installed to any one end of every rotor, two gears mesh mutually, one of them gear is as the action wheel, another gear is as from the driving wheel, drive during the action wheel motion from the driving wheel rotation drive two rotors simultaneously and do reverse synchronous revolution motion each other, thereby bulldoze and remove gas and realize the purpose of bleeding. 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 rotating speed of the rotor is 3000 r/min, the vacuum degree is-0.094 MPa, in the embodimentThe air extraction amount of the vacuum pump is 11m³The vacuum pump outlet pressure in this example was 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 utility model provides a pump body 5 adopts die-casting aluminium technology processing to form, and this embodiment vacuum pump adopts 304 stainless steel or magnalium alloy to make to satisfy the explosion-proof requirement of vacuum pump.

The above description is only a preferred embodiment of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

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.