CN210397080U - Novel built-in gas-liquid separation circulation fluid infusion double-screw oil-gas mixed delivery pump - Google Patents

Abstract

The utility model discloses a novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas mixed delivery pump, which comprises a pump body, an external connecting device connected with the pump body and an external API flushing system, wherein the pump body adopts an enlarged pump body and an eccentric structure, and the position of a driving shaft is positioned at the middle lower part far away from an inlet and an outlet; a built-in circulating liquid supplementing valve is arranged at the middle lower part of the pump body and is arranged between the pump outlet chamber B area and the inlet chamber A area; the pump also comprises a driving shaft and a driven shaft which are arranged in the pump body in parallel, wherein a left-handed spiral sleeve and a right-handed spiral sleeve are arranged on the driving shaft and the driven shaft in the pump body; the driving shaft and the driven shaft are arranged on the pump body through a front bearing seat, a rear bearing seat and a bushing. The utility model discloses a special construction's the pump body, through pressure differential and built-in circulating valve with the liquid reflux of unnecessary certain proportion to the import cavity A district of pump so that guarantee even the medium that the entrance point came also can normally work for pure gaseous medium, avoided the liquid shortage to cause the overheated damage of doing to rub futilely.

Description

Novel built-in gas-liquid separation circulation fluid infusion double-screw oil-gas mixed delivery pump

Technical Field

The utility model relates to a double-screw oil-gas multiphase pump technical field especially relates to a novel built-in gas-liquid separation circulation fluid infusion double-screw oil-gas multiphase pump of large-traffic compact of low pressure.

Background

At present, the conventional double-screw pump in the market at home and abroad is only suitable for conveying pure liquid or gas-liquid mixed medium with a small amount of gas; when the gas content (volume ratio GVF) in the mixed medium exceeds 50 percent, the delivery of the medium by the pump is seriously influenced, the sucking performance of the pump is influenced, the mechanical seal is influenced, and the service life of the pump is prolonged; the pump fails due to the phenomena of abnormal vibration, noise, overheating of the pump body and the like caused by the damage of cavitation-like in the running process of the pump.

The clearance fit between the rotor and the stator (pump body or lining) of the twin-screw pump is used for realizing the pumping purpose, and the self-sucking capability of the pump is established, and the fit clearance must be filled with liquid conveying medium so as to form an independent sealed cavity for realizing the conveying purpose. Under the working condition of high gas-gas ratio, if a gas-liquid separation and circulating liquid supplementing device is not provided, the liquid in the pump body is easily consumed, the matching gap between the stator and the rotor is not filled with liquid medium, the pump cannot form effective self-absorption capacity and cannot work normally; gaseous state transport medium can produce a large amount of heats by the compression in-process, does not have the liquid state transport medium in time to take away the heat that produces, and the pump can appear overheated phenomenon such as very easily and appear that the pump is locked or the card is dead to lose efficacy.

In order to realize oil-gas mixed transportation under the working condition of high gas content ratio, the general method is to add an external gas-liquid separation tank in a pump pry to realize gas-liquid separation, realize circulation liquid supplement in the pump body conveying process through an external circulation pipeline and a control valve, and achieve the aim that the pump can normally convey the mixed medium with high gas content ratio. However, the external oil-gas separation and circulating fluid infusion device greatly increases the installation size and weight of the pump skid, and adds unnecessary additional manufacturing cost, and the solution is not suitable for application occasions with high requirements on installation size and weight, such as drilling platforms.

Chinese patent CN200620027775.9 relates to a high gas content ratio oil-gas mixed transportation double screw pump, which comprises a pump body, a pump suction inlet, a pump discharge outlet, a separation chamber, a return valve, a double screw component and a mechanical seal, and is characterized in that the inner cavity of the pump body is provided with two closed return chambers at the front and rear ends, the front and rear return chambers are connected with the separation chamber through a return valve, and the front and rear return chambers are provided with two jet nozzles opposite to the mechanical seal. The utility model realizes the reliability and high efficiency of the operation of the oil-gas mixed transportation double screw pump under the working condition of high gas content ratio through the special internal circulation structure design; when the gas content ratio at the inlet of the oil-gas mixed conveying double-screw pump is 100%, the double-screw pump can still normally operate within a certain time, and the dry operation capacity of the oil-gas mixed conveying pump is realized. However, in the technical scheme, the purpose that the pump can normally convey the mixed medium with high gas content ratio is achieved by using the combination of the reflux valve and the nozzle to realize the circulating liquid supplement in the pump body conveying process, but oil liquid is required to be in an initial state entering a pump suction inlet when the pump starts to operate, and when the oil-gas mixed conveyance is realized under the working condition with high gas content ratio, no liquid medium is filled in a fit clearance between the stator and the rotor, so that the pump cannot form effective self-absorption capacity and cannot normally work; the compression of the gaseous transport medium generates a large amount of heat, which results in unnecessary energy losses.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention adopts the following technical solutions to implement:

the utility model provides a novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas multiphase pump which characterized in that: the pump body adopts an enlarged pump body and an eccentric structure, and the driving shaft is positioned at the middle lower part far away from the inlet and the outlet;

a built-in circulating liquid supplementing valve is arranged at the middle lower part of the pump body and is arranged between the pump outlet chamber B area and the inlet chamber A area;

the novel built-in gas-liquid separation circulating fluid infusion double-screw oil-gas mixed transportation pump also comprises a driving shaft and a driven shaft which are arranged in the pump body in parallel, and a left-handed screw sleeve and a right-handed screw sleeve are arranged on the driving shaft and the driven shaft in the pump body; the driving shaft and the driven shaft are arranged on the pump body through a front bearing seat, a rear bearing seat and a bushing.

Preferably, the bushing is arranged on two side walls of the pump body, and the bushing is in clearance fit with the left-handed spiral sleeve and the right-handed spiral sleeve; the outlet chamber B area of the pump body is communicated with the areas where the left-handed spiral sleeve and the right-handed spiral sleeve are located; thereby ensuring that the oil enters the area where the left-handed screw sleeve and the right-handed screw sleeve are positioned.

Preferably, the built-in circulating fluid infusion valve is arranged between the pump outlet chamber B area and the inlet chamber A area in the middle of the pump body;

the pump body is of a welded structure, and a left-handed screw sleeve and a right-handed screw sleeve are respectively arranged on the driving shaft and the driven shaft to form a rotor assembly;

the rotor assembly and the mechanical seal are positioned in a circular cavity C at the middle lower part of the pump body;

the rotor assembly in the circular cavity C is positioned at the lower part of the center of the pump body far away from the inlet and the outlet flanges of the pump.

Preferably, the middle lower part of the pump body is a built-in circulating fluid infusion valve which is connected with an inlet cavity area A and an outlet cavity area B of the pump body and is a special structural device similar to a navel eye.

Preferably, external API flushing systems are connected to the two sides of the pump body, the external API flushing systems contain flushing liquid, and the external API flushing systems are connected with the pump body through inlet and outlet pipelines.

Preferably, the external API flushing system is communicated with a mechanical seal flushing cavity of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixed delivery pump through an inlet and outlet pipeline.

Preferably, the front bearing seat, the rear bearing seat, the angular contact ball bearing, the cylindrical roller bearing a and the cylindrical roller bearing b are mounted on the pump body; the motor drives a driving shaft through a coupler, and drives a driven shaft to simultaneously rotate in opposite directions through synchronous gear transmission of a non-driving end, a left spiral sleeve and a right spiral sleeve are meshed with each other, namely a whole body consisting of the two left spiral sleeves and the right spiral sleeve, and a bushing is matched outside the spiral sleeves;

the driving shaft and the driven shaft penetrate through the two bearing seats, two ends of the two shafts of the driving shaft and the driven shaft are in contact with the ball bearings through the bearing angle, and the cylindrical roller bearing a and the cylindrical roller bearing b are in contact with an external connecting device; the external connecting device is fixedly connected with the pump body through bolts.

Preferably, the built-in circulating fluid infusion valves are positioned at the bottom of the front end of the pump body, each built-in circulating fluid infusion valve is welded on the pump body through a valve body, each built-in circulating fluid infusion valve comprises a valve core, an adjusting rod, a spring seat and a valve cover, a threaded hole is formed in the middle of the valve core, threads on the adjusting rod are meshed with threads in the middle of the valve core, the spring is sleeved on the outer side of the adjusting rod, the lower portion of the spring is in contact with the opening end face of the valve core, the upper portion of the spring is in contact with an annular protruding disc fixedly connected to the spring seat, the spring seat is fixedly connected to the valve cover, the valve; the upper end face of the valve core seal can close an opening channel of a partition plate between an inlet cavity A area and an outlet cavity B area, and the valve core can be controlled to move towards the valve cover when the adjusting rod is rotated.

Preferably, the valve cover and the adjusting rod are provided with two static sealing rings.

Preferably, the outlet chamber area B of the pump body is a high pressure chamber, and the inlet chamber area a is a low pressure chamber.

The technical scheme of the utility model following advantage and beneficial effect have at least:

1. the novel built-in gas-liquid separation circulating fluid infusion double-screw oil-gas mixed delivery pump adopts an eccentric structure design, so that the volume of a cavity at the inlet position of the pump is larger than that of a double-screw pump with a conventional structure, low-pressure oil-gas mixed delivery medium at the inlet end is stored, and the passing performance of the medium is ensured;

2. the novel built-in gas-liquid separation circulating fluid infusion double-screw oil-gas mixed delivery pump adopts an eccentric structure design, so that the volume of a cavity at the outlet of the pump is larger than that of a cavity at the conventional structure, and when an oil-gas mixed medium is delivered, because the specific gravity of gas and liquid is different, the gas and liquid can be automatically layered according to the self weight; the gas will gather towards the upper end of the outlet, and the liquid will automatically gather below the outlet chamber B area;

3. the utility model discloses built-in circulation moisturizing valve guarantees that the rear portion liquid separating physical stamina of exit end gas-liquid separation is automatic to be mended back to the inlet end of pump, guarantees that the liquid is sufficient in the pump body to guarantee that the pump has the conveying capacity;

4. the utility model discloses built-in gas-liquid separation oil-gas multiphase pump adopts eccentric structure design for rotor and mechanical seal are in the pump body lower position, and this position is the liquid district of depositing of pump liquid, and fit clearance between rotor and the stator is packed by liquid transport medium more easily and is guaranteed sealing performance, and mechanical seal is in and deposits the liquid district and obtains good lubrication and cooling easily, avoids the starved solution to cause the overheated damage of doing to rub futilely, has guaranteed the life of pump.

Drawings

FIG. 1 is a left side view of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas multiphase pump;

FIG. 2 is a front view of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixture pump;

FIG. 3 is a schematic diagram of a top-view cross-sectional structure of the novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas multiphase pump;

FIG. 4 is a schematic cross-sectional view of a middle shaft of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas multiphase pump; wherein A is an inlet chamber area A, and B is an outlet chamber area B;

FIG. 5 is a schematic view of the structure of the built-in circulation fluid infusion valve of the present invention;

wherein, the part names corresponding to the reference numbers are as follows:

the pump comprises a pump body 1, a front bearing seat 2, a rear bearing seat 3, a gear box 4, a driving shaft 5, a driven shaft 6, a left-handed screw sleeve 7, a right-handed screw sleeve 8, a bushing 9, an angular contact ball bearing 10, a cylindrical roller bearing 11 a, a cylindrical roller bearing 12 b, a built-in circulating fluid infusion valve 13, a PLV pressure limiting valve 14 and an API 15 flushing system, wherein the cylindrical roller bearing A and the cylindrical roller bearing B are arranged on the pump body;

Detailed Description

The present invention will be described with reference to the accompanying drawings and specific embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them.

Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of some embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "back" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the product of the present invention is usually placed when used. Such terms are merely for convenience in describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be taken as limiting the invention.

It is further noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-5, a novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixed delivery pump comprises a pump body 1, an external connecting device connected with the pump body, and an external API flushing system 15, wherein the pump body 1 adopts an enlarged pump body and an eccentric structure, and a driving shaft 5 is positioned at the middle lower part far away from an inlet and an outlet;

a built-in circulating liquid supplementing valve 13 is arranged at the middle lower part of the pump body 1 and is arranged between a pump outlet chamber B area and an inlet chamber A area;

as a preferred embodiment of the present invention, the outlet chamber B of the pump body 1 is a high pressure chamber, and the inlet chamber a is a low pressure chamber;

as shown in fig. 3, further, the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixture pump further comprises a driving shaft 5 and a driven shaft 6 which are arranged in the pump body 1 in parallel, and in the pump body 1, the driving shaft 5 and the driven shaft 6 are both provided with a left-handed screw sleeve 7 and a right-handed screw sleeve 8; the driving shaft 5 and the driven shaft 6 are arranged on the pump body 1 through a front bearing seat 2, a rear bearing seat 3 and a bush 9;

as a preferred embodiment of the present invention, the gear box 4 is fixedly connected to the left side of the pump body 1; the bushing 9 is arranged on two side walls of the pump body 1, and the bushing 9 is in clearance fit with the left-handed spiral sleeve 7 and the right-handed spiral sleeve 8; the outlet chamber B area of the pump body 1 is communicated with the areas where the left-handed screw sleeve 7 and the right-handed screw sleeve 8 are located; thereby ensuring that the oil enters the areas where the left-handed screw sleeve 7 and the right-handed screw sleeve 8 are positioned;

the pump body 1 of the utility model is of an enlarged eccentric structure, so that the bottom of the pump body 1 is easier to store enough liquid conveying medium; the liquid conveying medium for gas-liquid separation can return a certain proportion of the medium from the outlet chamber B area of the pump to the inlet chamber A area of the pump through the built-in circulating valve 13 in the pump body 1, so that the pump can work normally even under the working condition of high gas content ratio and even pure gas;

the switch of the built-in circulation fluid infusion valve 13 can be adjusted according to the actual operation working condition and the medium liquid content, and the internal circulation fluid infusion proportion is adjusted so as to ensure the effective operation of the pump;

as a preferred embodiment of the present invention, in order to realize the automatic separation of gas and liquid in the pump body 1, the built-in circulation liquid replenishing valve 13 is installed between the pump outlet chamber B area and the inlet chamber a area in the middle of the pump body 1;

as a preferred embodiment of the utility model, the middle lower part of the pump body 1 is a built-in circulating liquid supplementing valve 13 which is connected with an inlet cavity A area of the pump body 1 and an outlet cavity B area of the pump body 1 and is a special structure device similar to a navel eye;

as shown in fig. 2, as a preferred embodiment of the present invention, an external API flushing system 15 is externally connected to both sides of the pump body 1, the external API flushing system 15 contains flushing fluid, and the external API flushing system 15 is connected to the pump body 1 through an inlet and outlet pipeline;

further, the external API flushing system 15 is communicated with a mechanical seal flushing cavity of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixed delivery pump through an inlet and outlet pipeline, and the external API flushing system 15 enables flushing fluid to enter the mechanical seal flushing cavity to protect mechanical seal;

as a preferred embodiment of the present invention, the mechanical seal is a double-end-face cartridge mechanical seal; the mechanical seal flushing cavity is not communicated with the outlet cavity B area and the inlet cavity A area, so that the outlet cavity B area, the inlet cavity A area and the mechanical seal flushing cavity are isolated;

as a preferred embodiment of the present invention, the PLV pressure limiting valve 14 is fixed on the left side of the pump body 1, and plays a role in limiting the pressure in the pump body 1;

as shown in fig. 3, the pump body 1 is of a welded structure, and a left-handed screw sleeve 7 and a right-handed screw sleeve 8 are respectively arranged on the driving shaft 5 and the driven shaft 6 to form a rotor assembly;

as a preferred embodiment of the present invention, the novel built-in gas-liquid separation oil-gas multiphase pump adopts an eccentric structure, the rotor assembly and the mechanical seal are located in the circular cavity C at the lower part of the pump body 1, and the part is the liquid storage area of the pump liquid;

as a preferred embodiment of the present invention, the position of the rotor assembly in the circular cavity C is located at a position lower than the center of the pump body 1 away from the pump inlet and outlet flanges;

further, the front bearing seat 2, the rear bearing seat 3, the angular contact ball bearing 10, the cylindrical roller bearing a 11 and the cylindrical roller bearing b 12 are mounted on the pump body 1; the motor drives the driving shaft 5 through the coupler, and drives the driven shaft 6 to simultaneously rotate in opposite directions through synchronous gear transmission of a non-driving end, a left spiral sleeve and a right spiral sleeve are mutually meshed, namely, a whole body consisting of two left spiral sleeves 7 and a right spiral sleeve 8 is mutually meshed, and a lining 9 is matched outside the spiral sleeves;

as a preferred embodiment of the present invention, the front bearing seat 2 and the rear bearing seat 3 are respectively fixed on two sides of the pump body 1, the driving shaft 5 and the driven shaft 6 pass through the two bearing seats, two ends of two shafts of the driving shaft 5 and the driven shaft 6 pass through the bearing angular contact ball bearing 10, and the cylindrical roller bearing a 11 and the cylindrical roller bearing b 12 are in contact with the external connection device; the external connecting device is fixedly connected with the pump body 1 through bolts;

as shown in fig. 2, as a preferred embodiment of the present invention, an inlet flange and an outlet flange are respectively disposed in front of and at the upper part of the novel built-in gas-liquid separation circulating fluid infusion twin-screw oil-gas mixture transfer pump;

as shown in fig. 5, as a preferred embodiment of the present invention, the built-in circulation fluid infusion valve 13 is located at the bottom of the front end of the pump body, each built-in circulation fluid infusion valve 13 is welded on the pump body 1 by the valve body 131, the built-in circulation fluid infusion valve 13 includes a valve core 132, an adjusting rod 133, a spring 134, a spring seat 135, and a valve cover 136, the middle of the valve core 132 has a threaded hole, the thread on the adjusting rod 133 is engaged with the thread in the middle of the valve core 132, the spring 134 is sleeved outside the adjusting rod 133, the lower part of the spring 134 is in contact with the open end face of the valve core 132, the upper part of the spring 134 is in contact with an annular protruding disk fixedly connected to the spring seat 135, the spring seat 135 is fixedly connected to the valve cover 136, the valve cover 136 is fixedly connected to; the valve core 132 closes the opening channel of the partition plate between the area A of the inlet chamber and the area B of the outlet chamber by closing the upper end surface, and when the adjusting rod 133 is rotated, the valve core 132 can be controlled to move towards the valve cover 136, so that the opening and closing of the opening channel are controlled;

the displacement of the valve core 132 can be controlled by rotating the adjusting rod 133, and the adjustment of the opening degree of the built-in circulating fluid infusion valve 13 can be realized; the valve body 131 is welded on the pump body 1, the valve core 132 can rotate under the control of the valve rod 3, and the valve cover 136 and the adjusting rod 133 are provided with double static sealing rings for preventing leakage.

As can be seen from the structural schematic diagram of the built-in circulating valve 13 of the double-screw oil-gas mixture transfer pump in fig. 5, the circulating valve is located between the low-pressure cavity a and the high-pressure cavity B, the valve body 1 is welded on the pump body 1, the valve core 2 can be closed or opened through the rotation of the valve rod 3, and the opening of the valve can be adjusted to adjust the proportion of circulating reflux needed according to the requirement of practical application working conditions so as to ensure the normal operation of the pump; spring 5 can provide necessary pretightning force for the case, installs double static sealing washer on valve gap 6 and the valve rod 3 and prevents revealing. Through the built-in circulating valve 13, the pump can be ensured to work normally under the working condition of high gas content ratio.

The utility model discloses a theory of operation is: the double-screw oil-gas mixed transmission pump forms independent sealing chambers, and along with the rotation of the driving shaft 5 and the driven shaft 6, conveying media in the sealing chambers are conveyed from two sides to the middle along the axial direction and discharged from an outlet chamber B area of the pump body 1; meanwhile, as the medium is discharged, the area A of the inlet chamber forms a low-pressure cavity with self-suction capability, and the subsequent medium can be continuously sucked to form a continuous medium conveying function so as to finish the pumping purpose.

The rotors formed by the spiral sleeve, the driving shaft 5 and the driven shaft 6 are in clearance fit, pure liquid is conveyed by a common double-screw pump, the fit clearance is always in a liquid conveying medium filling state, and the pump has self-absorption performance; the oil-gas mixed transportation pump needs to face the working condition of high gas content ratio and even short-term 100% pure gas, and the common liquid pump cannot work under the working condition and has no self-absorption capacity.

This novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas mixed transportation pump is owing to adopted behind special eccentric structural design and the built-in circulation fluid infusion valve 13, can guarantee that rotor assembly and mechanical seal can be in all the time and deposit the liquid district, in the mixed transportation in-process, under the operating mode that liquid content is few, realize through built-in circulation fluid infusion valve 13 that liquid follows the automatic low pressure chamber that supplyes of high pressure chamber, from circulation operation, guarantee that the fit clearance between rotor and the stator can obtain liquid medium's packing throughout sealed, make this kind of special construction's oil-gas mixed transportation pump can use in the operating mode that well high proportion contains the gas ratio, realize the oil-gas mixture and carry.

Compared with a conventional double-screw pump, the volume of an inlet chamber A area and an outlet chamber B area of the pump body 1 is increased, and the lining 9 and the rotor are arranged at the middle lower part of the pump body 1; the structural layout has the advantages that the pump is suitable for the oil-gas mixed transportation working condition with higher gas content ratio; the gas is in a low-pressure state in the area A of the inlet chamber, and the volume of the gas with the same mass is larger; a larger inlet suction chamber than a common pure liquid delivery pump is required in order to ensure the passing performance of the medium;

this novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas mixed transportation pump passes through the pump body 1 of special construction, handles the liquid separation in the export intracavity and saves in pump body 1 lower part, through pressure differential and built-in circulating valve 13 with unnecessary liquid reflux to the import cavity A district (low-pressure chamber) of pump of certain proportion so that even the air lock appears in the assurance entrance point, the medium that comes is pure gaseous medium, the pump deposit liquid and the circulated liquid of exit end separation can guarantee that the pump is normal contact work 30-120 minutes at least, it is efficient.

The above embodiments are only used for illustration and not for limiting the technical solution of the present invention. Any modification or partial replacement without departing from the spirit of the present invention should be covered by the scope of the claims of the present invention.

Claims (9)

1. The utility model provides a novel built-in gas-liquid separation circulation fluid infusion twin-screw oil-gas multiphase pump which characterized in that: the pump comprises a pump body (1), an external connecting device and an external API flushing system (15), wherein the external connecting device and the external API flushing system are connected with the pump body, the pump body (1) adopts an enlarged pump body and an eccentric structure, and a driving shaft (5) is positioned at the middle lower part far away from an inlet and far away from an outlet;

a built-in circulating liquid supplementing valve (13) is arranged at the middle lower part of the pump body (1) and is arranged between a pump outlet chamber B area and an inlet chamber A area;

the novel built-in gas-liquid separation circulating fluid infusion double-screw oil-gas mixed delivery pump also comprises a driving shaft (5) and a driven shaft (6) which are arranged in the pump body (1) in parallel, wherein a left-handed screw sleeve (7) and a right-handed screw sleeve (8) are arranged on the driving shaft (5) and the driven shaft (6) in the pump body (1); the driving shaft (5) and the driven shaft (6) are arranged on the pump body (1) through a front bearing seat (2), a rear bearing seat (3) and a bushing (9).

2. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 1, characterized in that: the bushing (9) is arranged on two side walls of the pump body (1), and the bushing (9) is in clearance fit with the left-handed spiral sleeve (7) and the right-handed spiral sleeve (8); the outlet cavity B area of the pump body (1) is communicated with the areas where the left-handed screw sleeve (7) and the right-handed screw sleeve (8) are located; thereby ensuring that the oil enters the areas where the left-handed screw sleeve (7) and the right-handed screw sleeve (8) are positioned.

3. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 1, characterized in that: in the middle of the pump body (1), the built-in circulating liquid supplementing valve (13) is arranged between a pump outlet chamber B area and an inlet chamber A area;

the pump body (1) is of a welded structure, and a left-handed spiral sleeve (7) and a right-handed spiral sleeve (8) are respectively arranged on the driving shaft (5) and the driven shaft (6) to form a rotor assembly;

the rotor assembly and the mechanical seal are positioned in a circular cavity C at the middle lower part of the pump body (1);

the position of the rotor assembly in the circular cavity C is located at the lower part of the center of the pump body (1) far away from the inlet and outlet flanges of the pump.

4. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 1, characterized in that: the pump body (1) both sides external connection outside API rinse-system (15), outside API rinse-system (15) contain the flush fluid, outside API rinse-system (15) are through importing and exporting pipeline and pump body (1) and link to each other.

5. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 4, characterized in that: and the external API flushing system (15) is communicated with a mechanical seal flushing cavity of the novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump through an inlet and outlet pipeline.

6. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 1, characterized in that: the front bearing seat (2), the rear bearing seat (3), the angular contact ball bearing (10), the cylindrical roller bearing a (11) and the cylindrical roller bearing b (12) are arranged on the pump body (1); the motor drives a driving shaft (5) through a coupler, drives a driven shaft (6) to simultaneously rotate in opposite directions through synchronous gear transmission of a non-driving end, the whole body formed by the two left-handed screw sleeves (7) and the right-handed screw sleeve (8) are mutually meshed, and a lining (9) is matched outside the screw sleeves;

the driving shaft (5) and the driven shaft (6) penetrate through the two bearing seats, two ends of the two shafts of the driving shaft (5) and the driven shaft (6) are in contact with the ball bearing (10) through the bearing angle, and the cylindrical roller bearing a (11) and the cylindrical roller bearing b (12) are in contact with an external connecting device; the external connecting device is fixedly connected with the pump body (1) through bolts.

7. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 2, characterized in that: the built-in circulating liquid supplementing valves (13) are positioned at the bottom of the front end of the pump body, each built-in circulating liquid supplementing valve (13) is welded on the pump body (1) through a valve body (131), each built-in circulating liquid supplementing valve (13) comprises a valve core (132), an adjusting rod (133), a spring (134), a spring seat (135) and a valve cover (136), the middle of the valve core (132) is provided with a threaded hole, the thread on the adjusting rod (133) is meshed with the thread in the middle of the valve core (132), a spring (134) is sleeved outside the adjusting rod (133), the lower part of the spring (134) is contacted with the opening end face of the valve core (132), the upper part of the spring (134) is contacted with an annular convex disk fixedly connected with the spring seat (135), the spring seat (135) is fixedly connected with the valve cover (136), the valve cover (136) is fixedly connected with the valve body (131) through a screw, the inner side surface of the valve body (131) is in sliding connection with the outer side surface of the circular ring of the valve core (132); the closed upper end surface of the valve core (132) can close an opening channel of a partition plate between an inlet chamber area A and an outlet chamber area B, and the valve core (132) can be controlled to move towards the valve cover (136) when the adjusting rod (133) is rotated.

8. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 7, is characterized in that: and the valve cover (136) and the adjusting rod (133) are provided with two static sealing rings.

9. The novel built-in gas-liquid separation circulating fluid supplementing twin-screw oil-gas mixed delivery pump according to claim 1, characterized in that: the outlet cavity B area of the pump body (1) is a high-pressure cavity, and the inlet cavity A area is a low-pressure cavity.

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