CN219654875U - Double-screw feeding pump - Google Patents

Abstract

The utility model relates to the technical field of liquid conveying machinery, in particular to a double-screw feeding pump, which comprises two first screw pumps and two second screw pumps which are arranged in parallel; positioning structures are arranged in the first screw pump and the second screw pump, and the positioning structures are suitable for enabling a preset phase difference to exist between the first screw pump and the second screw pump in an initial state; the first screw pump and the second screw pump are both in driving connection with a driving assembly, and the driving assembly is suitable for driving the first screw pump and the second screw pump to synchronously rotate. The technical problems that the existing double-screw feeding pump is difficult to adjust when in installation, the two single-screw pumps have preset phase difference in the initial state, the installation accuracy is poor, and constant feeding is affected are solved.

Description

Double-screw feeding pump

Technical Field

The utility model relates to the technical field of liquid conveying machinery, in particular to a double-screw feeding pump.

Background

The single screw pump is a rotor type volumetric pump, and it relies on the mutual engagement of screw and bush to produce volume change in suction cavity and discharge cavity to deliver liquid. The internal-meshed closed screw pump consists of main working parts including lining with double-head screw cavity and single-head screw meshed with the lining. When the input shaft drives the rotor to rotate around the center of the stator through the universal joint, the stator and the rotor pair are continuously meshed to form sealed cavities, the volumes of the sealed cavities do uniform axial motion constantly, conveying media are conveyed from the suction end to the extrusion end through the stator rotor pair, and the media sucked into the sealed cavity flow through the stator without being stirred and damaged. The pipeline pressure in the stator is periodically changed along with the circumferential rotation of the screw rod in the process of matching the screw rod and the stator, so that the pressure distribution of liquid in the pipeline of the stator is uneven in the process of conveying liquid, the liquid is periodically fluctuated when passing through the pipeline in the stator, the pressure fluctuation is uneven, the uniformity of discharging is poor, the constant feeding of a subsequent process is influenced, and the constant feeding is realized by arranging a plurality of single-screw pumps, wherein the flow pressure fluctuation of the single-screw pumps is offset in the period.

The existing double-screw feeding pump has the problems that the fixed phase difference exists between two single-screw pumps in an initial state so that internal liquid pressure is complementary in period when the two single-screw pumps synchronously rotate, so that pipeline pressures of the two single-screw pumps mutually offset in period when the two single-screw pumps synchronously rotate, however, the two single-screw pumps are difficult to adjust when being installed, the two single-screw pumps have preset phase difference in the initial state, the installation accuracy is poor, and the constant feeding is influenced.

Disclosure of Invention

The utility model provides a double-screw feeding pump, which solves the technical problems that the existing double-screw feeding pump is difficult to adjust the preset phase difference between two single-screw pumps in the initial state during installation, the installation precision is poor, and the constant feeding is affected.

In view of this, the present utility model provides a twin screw feed pump comprising two parallel arranged first and second screw pumps;

positioning structures are arranged in the first screw pump and the second screw pump, and the positioning structures are suitable for enabling the first screw pump and the second screw pump in an initial state to have a preset phase difference;

the first screw pump and the second screw pump are both in driving connection with a driving assembly, and the driving assembly is suitable for driving the first screw pump and the second screw pump to synchronously rotate.

Optionally, the first screw pump and the second screw pump each comprise a housing, a stator, and a rotor; one end of the rotor is in driving connection with the driving assembly, and the other end of the rotor stretches into the inner cavity of the stator and is suitable for conveying materials in a rotating mode in the stator; the stator is arranged in the shell in a penetrating way.

Optionally, the positioning structure comprises a first positioning key, the first positioning key is arranged on the periphery side of the stator, and a first positioning groove corresponding to the first positioning key is concavely arranged on the inner side of the shell; the two first positioning keys are arranged at preset angles in the circumferential direction at intervals, and the two rotors are arranged in the stator at the same angle;

or, the positioning structure comprises a first positioning key, the first positioning key is arranged on the inner side of the shell, and a first positioning groove corresponding to the first positioning key is concavely arranged on the periphery of the stator; the two first positioning grooves are arranged at preset angles in the circumferential direction at intervals, and the two rotors are arranged in the stator at the same angle.

Optionally, the drive assembly includes servo motor and speed reducer, servo motor's output with the input drive connection of speed reducer, the speed reducer is equipped with two output shafts, two the output shaft respectively through the connecting rod with two the rotor drive connection.

Optionally, the positioning structure comprises a second positioning key, the second positioning key is arranged on the circumference side of one end, connected with the rotor, of the connecting rod, and a second positioning groove is formed in the rotor corresponding to the second positioning key; the two second positioning keys are circumferentially arranged at intervals by a preset angle, and the two stators are arranged in the shell at the same angle;

or, the positioning structure comprises a second positioning key, the second positioning key is arranged in one end of the rotor connected with the connecting rod, and a second positioning groove is arranged on the periphery side of one end of the connecting rod connected with the rotor, corresponding to the second positioning key; the two second positioning grooves are arranged at preset angles in the circumferential direction at intervals, and the two stators are arranged in the shell at the same angle.

Optionally, the output shaft is in driving connection with the connecting rod through a coupler; one end of the coupler is connected with the output shaft, and the other end of the coupler is connected with the connecting rod.

Optionally, the positioning structure comprises a third positioning key, the third positioning key is arranged on the periphery side of the output shaft, and a third positioning groove is formed in the coupler corresponding to the third positioning key; the two third positioning keys are circumferentially arranged at intervals by a preset angle, and the two stators are arranged in the shell at the same angle;

or, the positioning structure comprises a third positioning key, the third positioning key is arranged in the coupler, and a third positioning groove is formed on the periphery of the output shaft corresponding to the third positioning key; the two third positioning grooves are circumferentially arranged at intervals by a preset angle, and the two stators are arranged in the shell at the same angle.

Optionally, the positioning structure comprises a fourth positioning key, the fourth positioning key is arranged on the circumference side of one end of the connecting rod, which is connected with the coupler, and a fourth positioning groove is arranged in the coupler corresponding to the fourth positioning key; the two fourth positioning keys are circumferentially arranged at intervals by a preset angle, and the two stators are arranged in the shell at the same angle;

or, the positioning structure comprises a fourth positioning key, the fourth positioning key is arranged in one end of the coupling connected with the connecting rod, and a fourth positioning groove is formed in the peripheral side of one end of the connecting rod connected with the coupling, corresponding to the fourth positioning key; the two fourth positioning grooves are arranged at preset angles in the circumferential direction at intervals, and the two stators are arranged in the shell at the same angle.

Optionally, the first screw pump and the second screw pump each further comprise a charging barrel, and the charging barrels are sleeved on the periphery of the connecting rod;

the two charging barrels are connected with a charging pipe through a first three-way pipe, and one ends of the two stators, which are far away from the connecting rod, are connected with a discharging pipe through a second three-way pipe;

and/or the speed reducer comprises a shell and two gear sets arranged in the shell; the two gear sets are meshed with each other and are respectively connected with one output shaft; the servo motor is arranged on the shell, and the output end of the servo motor is in driving connection with one of the gear sets.

Alternatively, the preset phase difference is 90 degrees or 270 degrees;

and/or, the screw pump further comprises a bottom plate, and the first screw pump and the second screw pump are arranged on the bottom plate.

The technical scheme of the utility model has the following advantages:

according to the utility model, the positioning structures are arranged in the first screw pump and the second screw pump, so that the first screw pump and the second screw pump have preset phase differences in an initial state after being installed, under the condition that the first screw pump and the second screw pump in the initial state have fixed phase differences, when the first screw pump and the second screw pump are driven to synchronously rotate, the first screw pump and the second screw pump always keep the phase differences, the liquid pressure wave crest of the first screw pump in the initial state corresponds to the liquid pressure wave trough of the second screw pump, the flow in the first screw pump and the second screw pump are in periodic complementation in the synchronous rotation process, the constant flow is kept, the phase differences of the first screw pump and the second screw pump in the initial state are conveniently adjusted through the positioning structures, the installation precision of the first screw pump and the second screw pump is improved, and the constant feeding is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a twin screw feed pump according to the present utility model;

FIG. 2 is a top view of a twin screw feed pump provided by the present utility model;

FIG. 3 is a cross-sectional view of the first positioning key shown in FIG. 2, illustrating a positioning structure according to the present utility model;

FIG. 4 is a cross-sectional view of the positioning structure of FIG. 2 at B-B in accordance with the present utility model;

FIG. 5 is a cross-sectional view of the location structure of FIG. 2 at C-C;

FIG. 6 is a cross-sectional view of the location structure of FIG. 2 at D-D, as provided by the present utility model, as a second location key;

FIG. 7 is a schematic view of pressure fluctuations of a first screw pump provided by the present utility model;

FIG. 8 is a schematic diagram of pressure fluctuations of a second screw pump provided by the present utility model;

fig. 9 is a schematic diagram of pressure fluctuation of a twin-screw feed pump according to the present utility model.

Reference numerals illustrate:

1. a first screw pump; 2. a second screw pump; 3. a housing; 4. a stator; 5. a rotor; 6. a first positioning key; 7. a first positioning groove; 8. a servo motor; 9. a speed reducer; 10. an output shaft; 11. a connecting rod; 12. a second positioning key; 13. a second positioning groove; 14. a coupling; 15. a third positioning key; 16. a third positioning groove; 17. a fourth positioning key; 18. a fourth positioning groove; 19. a charging barrel; 20. a first tee; 21. a feed pipe; 22. a second tee; 23. a discharge pipe; 24. a bottom plate.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

Referring to fig. 1 to 9, the present embodiment provides a twin screw feed pump, which includes two first screw pumps 1 and second screw pumps 2 arranged in parallel; positioning structures are arranged in the first screw pump 1 and the second screw pump 2, and the positioning structures are suitable for enabling a preset phase difference to exist between the first screw pump 1 and the second screw pump 2 in an initial state; the first screw pump 1 and the second screw pump 2 are both in driving connection with a driving assembly, and the driving assembly is suitable for driving the first screw pump 1 and the second screw pump 2 to synchronously rotate.

When the liquid is conveyed through the rotor 5, when the rotor 5 rotates in the inner cavity of the stator 4, the liquid pressure amplitude is unevenly distributed in the 360-degree rotation period of the inner cavity of the stator 4, the liquid pressure periodically fluctuates, the liquid pressure gradually increases from the lowest value (namely, the amplitude trough) in the period of the output pressure to the highest value (namely, the amplitude peak) in the period of the output pressure, then gradually decreases to the lowest value, the rotor 5 rotates for one circle, the liquid pressure pulsation amplitude periodically fluctuates along with the circumferential rotation of the rotor 5, the phase angle difference exists between the pressure waveforms output by the first screw pump 1 and the second screw pump 2, the phase angle difference between the first screw pump 1 and the second screw pump 2 is adjusted, and then the peaks and the troughs generated by the synchronous rotation of the first screw pump 1 and the second screw pump 2 are mutually offset, so that the feeding fluctuation is reduced.

The preset phase difference refers to the difference between the initial phase angles of the output pulses of the first screw pump 1 and the second screw pump 2.

In this embodiment, by arranging the positioning structures in the first screw pump 1 and the second screw pump 2, the first screw pump 1 and the second screw pump 2 have a preset phase difference in an initial state after being mounted, and under the condition that the first screw pump 1 and the second screw pump 2 in the initial state have the preset phase difference, when the first screw pump 1 and the second screw pump 2 are driven to synchronously rotate, the first screw pump 1 and the second screw pump 2 always keep the phase difference, the liquid pressure wave crest of the first screw pump 1 in the initial state corresponds to the liquid pressure wave trough of the second screw pump 2, the flow inside the first screw pump 1 and the second screw pump 2 are periodically complementary in the synchronous rotation process, the phase difference between the first screw pump 1 and the second screw pump 2 in the initial state is kept constant, the mounting precision of the first screw pump 1 and the second screw pump 2 is improved, and the constant feeding is ensured.

Example 2

As a further modification to embodiment 1, as shown in fig. 1 to 2, each of the first screw pump 1 and the second screw pump 2 includes a housing 3, a stator 4, and a rotor 5; one end of the rotor 5 is in driving connection with the driving assembly, and the other end of the rotor extends into the inner cavity of the stator 4 and is suitable for rotating in the stator 4 to convey materials; the stator 4 is provided in the housing 3.

In this embodiment, the casing 3 may be fixedly disposed, the stator 4 may be fixedly disposed in the casing 3, and the driving component drives the rotor 5 to rotate in the cavity of the stator 4 to convey the material, which may be liquid or viscous slurry, through the cavity of the stator 4.

On the basis of the above embodiment, in a specific embodiment, as shown in fig. 3, the positioning structure includes a first positioning key 6, the first positioning key 6 is disposed on the circumferential side of the stator 4, and a first positioning groove 7 corresponding to the first positioning key 6 is concavely disposed on the inner side of the housing 3; the two first positioning keys 6 are circumferentially arranged at a preset angle, and the two rotors 5 are arranged in the stator 4 at the same angle.

When the rotor 5 rotates in the stator 4 to a different angle in the circumferential direction (i.e., the relative angle between the rotor 5 and the stator 4 is different), the output pressure at the initial position in the initial state is different, i.e., the amplitude is different.

In this embodiment, the angles of the two stators 4 in the circumferential direction are adjusted to be the same by keeping the angles of the two rotors 5 in the circumferential direction, so that the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, that is, the hydraulic amplitude fluctuation between the two are staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be adjusted to be complementary in period, the amplitude wave crest between the two can be correspondingly offset with the amplitude wave trough, and the first positioning groove 7 arranged in the shell and the first positioning key 6 arranged on the stator 4 cooperate to ensure that the stator 4 is installed in the shell 3 at preset angles in the circumferential direction, thereby ensuring the installation accuracy.

In another alternative embodiment, the positioning structure comprises a first positioning key 6, the first positioning key 6 is arranged on the inner side of the shell 3, and a first positioning groove 7 corresponding to the first positioning key 6 is concavely arranged on the periphery of the stator 4; the two first positioning grooves 7 are circumferentially arranged at a preset angle, and the two rotors 5 are arranged in the stator 4 at the same angle. The two stators 4 are adjusted to have different circumferential angles by keeping the circumferential angles of the two rotors 5 to be the same, so that the first screw pump 1 and the second screw pump 2 have different phase differences in an initial state, namely, hydraulic amplitude fluctuation between the two screw pumps is staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be complementary in period, amplitude peaks and amplitude troughs between the two screw pumps are correspondingly counteracted, and the first positioning key 6 arranged in the shell and the first positioning groove 7 arranged on the stator 4 are matched to ensure that the stator 4 is arranged in the shell 3 at preset circumferential intervals, thereby ensuring the installation precision.

Specifically, the preset angle is 90 or 270 degrees. The peaks and the troughs of the first screw pump 1 and the second screw pump 2 are conveniently offset correspondingly after the first screw pump 1 and the second screw pump 2 are operated, the stability of the feeding pressure and the flow is improved, the fluctuation of the liquid pressure of the first screw pump 1 and the second screw pump 2 is obtained, the fluctuation of the liquid pressure of the double screw feeding pump is shown in fig. 7 and 8, and the fluctuation of the liquid pressure of the double screw feeding pump is shown in fig. 9.

On the basis of the above embodiment, in a specific embodiment, as shown in fig. 1 to 2, the driving assembly includes a servo motor 8 and a speed reducer 9, an output end of the servo motor 8 is in driving connection with an input end of the speed reducer 9, the speed reducer 9 is provided with two output shafts 10, and the two output shafts 10 are respectively in driving connection with the two rotors 5 through connecting rods 11.

In this embodiment, the driving force is provided by the servo motor 8, the two output shafts 10 are provided by the speed reducer 9, and the first screw pump 1 and the second screw pump 2 are synchronously driven to rotate by the connecting rod 11, so that the rotors 5 of the first screw pump 1 and the second screw pump 2 continuously rotate at the same speed and phase difference, and the torque can be improved by the speed reducer 9, especially when the fluctuation amplitude is reduced at low speed, in addition, the first screw pump 1 and the second screw pump 2 are driven by one servo motor 8 by the speed reducer 9, so that the equipment cost and the installation space are saved, and the control difficulty that the control system needs angle detection and lead-lag adjustment when a plurality of single screw pumps are driven by a plurality of servo motors 8 is simplified.

As an alternative embodiment, as shown in fig. 6, the positioning structure may include a second positioning key 12, the second positioning key 12 is disposed on one end circumference side of the connecting rod 11 connected to the rotor 5, and a second positioning groove 13 is disposed in the rotor 5 corresponding to the second positioning key 12; the two second positioning keys 12 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the same angle of the two stators 4 in the circumferential direction and adjusting the different angles of the two rotors 5 in the circumferential direction, the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two screw pumps is staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be regulated to be complementary in period, the amplitude peaks and the amplitude troughs between the two screw pumps are correspondingly counteracted, the preset angles are circumferentially spaced when the rotors 5 are installed in the stators 4 through the cooperation of the second positioning grooves 13 arranged in the rotors 5 and the second positioning keys 12 arranged on the connecting rods 11, the installation precision is ensured, and after the disassembly and the cleaning, the two screw pumps are installed by the aid of the positioning structure, the two screw pumps are still installed in the same combination and the same angle difference, so that the flow rate of periodical complementation can be output, and the stability of the flow rate is achieved, specifically, the preset angles are 90 or 270 degrees, the amplitude peaks and the amplitude troughs of the first screw pump 1 and the second screw pump 2 are conveniently counteracted after the operation, the feed pressure and the flow rate stability are improved, and the feed pressure fluctuation of the first screw pump 1 and the second screw pump 2 are obtained, and the liquid pressure fluctuation of the two screw pump 7 and the liquid pressure fluctuation of the liquid pump is shown in the figure 9 are shown in the figure 9.

In another alternative embodiment, the positioning structure comprises a second positioning key 12, the second positioning key 12 is arranged in one end of the rotor 5 connected with the connecting rod 11, and a second positioning groove 13 is arranged on the periphery side of one end of the connecting rod 11 connected with the rotor 5 corresponding to the second positioning key 12; the two second positioning grooves 13 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the same angle of the two stators 4 in the circumferential direction and adjusting the different angles of the two rotors 5 in the circumferential direction, the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two screw pumps is staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be mutually complementary in period, the amplitude wave crest between the two screw pumps is correspondingly offset with the amplitude wave trough, the second positioning key 12 arranged in the rotor 5 and the second positioning groove 13 arranged on the connecting rod 11 are matched to ensure that the rotor 5 is arranged at preset angles in the circumferential direction when the stator 4 is arranged, the installation precision is ensured, and after the disassembly and the cleaning, the two screw pumps are installed by the aid of the positioning structure, the two screw pumps are still installed in the same combination and the same angle difference, the periodical complementary flow can be output, so that the stability of the flow pressure is achieved, specifically, the preset angle is 90 or 270 degrees, the wave crest and the wave crest of the second screw pump 2 can be conveniently offset after the first screw pump 1 and the second screw pump 2 are operated, the stability of the feed pressure and the flow is improved, the feed pressure and the flow stability of the feed pressure and the second screw pump 2 are conveniently offset with the wave trough corresponding to the wave trough after the first screw pump 1 and the second screw pump 2 are shown in a liquid pressure fluctuation graph 7 and a liquid pressure graph 8, and a liquid fluctuation graph 9 is shown by the liquid pressure graph 9, and a liquid graph 8 is obtained

Specifically, the end of the link 11 connected to the rotor 5 extends into the end of the rotor 5 and is keyed to the rotor 5.

On the basis of the above embodiment, in a specific embodiment, the output shaft 10 is in driving connection with the connecting rod 11 through the coupling 14; one end of the coupling 14 is connected to the output shaft 10, and the other end is connected to the link 11.

In this embodiment, the output shaft 10 of the speed reducer 9 and the link 11 are connected by the coupling 14, so that the driving force can be transmitted conveniently, and the protection function can be achieved.

Specifically, the coupling 14 may be selected from the group consisting of a plum coupling 14, a split rigid coupling 14, a universal coupling 14, and a tooth coupling 14.

As an alternative embodiment, as shown in fig. 4, the positioning structure may include a third positioning key 15, the third positioning key 15 is disposed on the circumferential side of the output shaft 10, and a third positioning groove 16 is disposed in the coupling 14 corresponding to the third positioning key 15; the two third positioning keys 15 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the same angle of the two stators 4 in the circumferential direction and adjusting the different angles of the two rotors 5 in the circumferential direction, the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two are staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be regulated to be complementary in period, the amplitude peaks and the amplitude troughs between the two can be correspondingly counteracted, the embodiment is matched with the third positioning key 15 on the output shaft 10 through the third positioning groove 16 arranged in the coupler 14, and the two third positioning keys 15 on the two output shafts 10 are separated by a preset angle, so that the rotor 5 is separated by a preset angle in the circumferential direction when being installed in the stator 4, the installation precision is ensured, and after the disassembly and the cleaning, the two screw pumps are installed with the same combination and the same angle difference, and the periodical complementary flow can be output, so that the stability of the flow pressure can be achieved, specifically, the preset angle is 90 or 270 degrees, the flow of the first screw pump 1 and the second screw pump 2 can be conveniently and the flow of the liquid can be counteracted with the pressure of the second screw pump, and the pressure fluctuation of the pressure pump 7 is shown in fig. 7, and the pressure fluctuation of the second screw pump is shown in fig. 7, and the pressure fluctuation 7 is shown by the pressure fluctuation of the pressure pump.

In another alternative embodiment, the positioning structure comprises a third positioning key 15, the third positioning key 15 is arranged in the coupler 14, and a third positioning groove 16 is arranged on the periphery of the output shaft 10 corresponding to the third positioning key 15; the two third positioning grooves 16 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the same angle of the two stators 4 in the circumferential direction and adjusting the different angles of the two rotors 5 in the circumferential direction, the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two are staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be regulated to be complementary in period, the amplitude peaks and the amplitude troughs between the two can be correspondingly counteracted, the embodiment is convenient for the first screw pump 1 and the second screw pump 2 to be matched with the third positioning grooves 16 on the output shaft 10 after operation by the third positioning key 15 arranged in the coupler 14, and the two third positioning grooves 16 on the two output shafts 10 are separated by a preset angle, so that the rotor 5 is circumferentially separated by a preset angle when being installed in the stator 4, the installation accuracy is ensured, and after the disassembly and the cleaning, the two screw pumps are installed with the same combination and the same angle difference, and the periodical complementary flow can be output, so that the flow is stable, specifically, the preset angle is 90 or 270 degrees, the flow stability of the first screw pump 1 and the second screw pump 2 can be conveniently counteracted with the corresponding pressure fluctuation of the feed pump 7, and the pressure fluctuation of the second screw pump 7 is shown in the figure 9, and the pressure fluctuation of the liquid pump is shown in the figure 9.

Specifically, one end of the output shaft 10 extends into one end of the coupling 14 and is keyed to the coupling 14.

As an alternative embodiment, as shown in fig. 5, the positioning structure may include a fourth positioning key 17, the fourth positioning key 17 is provided on one end circumference side of the connecting rod 11 connected to the coupling 14, and a fourth positioning groove 18 is provided in the coupling 14 corresponding to the fourth positioning key 17; the two fourth positioning keys 17 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the angles of the two stators 4 in the circumferential direction the same and adjusting the angles of the two rotors 5 in the circumferential direction to be different, so that the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two are staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be adjusted to be complementary in period, the amplitude peak between the two is correspondingly counteracted with the amplitude trough, the embodiment is matched with the fourth positioning key 17 on the connecting rod 11 through the fourth positioning groove 18 arranged in the coupler 14, and as the two fourth positioning keys 17 on the two connecting rods 11 are separated by a preset angle, the rotor 5 connected with the connecting rod 11 is arranged in the stator 4 at intervals of preset angles in the circumferential direction, so that the installation accuracy is ensured, after the rotor is disassembled and cleaned, the rotor is still installed in the same combination and the same angle difference through the auxiliary installation of the positioning structure, and the periodical complementary flow can be output, so that the stability of flow pressure is achieved, specifically, the preset angles are 90 or 270 degrees, the crest and trough of the first screw pump 1 and the second screw pump 2 are conveniently counteracted correspondingly after the operation, the stability of the feed pressure and the flow is improved, and the fluctuation of the liquid pressure of the first screw pump 1 and the second screw pump 2 is obtained as shown in fig. 7 and 8, and the fluctuation of the liquid pressure of the double screw feed pump is shown in fig. 9.

In another alternative embodiment, the positioning structure comprises a fourth positioning key 17, the fourth positioning key 17 is arranged in one end of the coupling 14 connected with the connecting rod 11, and a fourth positioning groove 18 is arranged on the circumference side of one end of the connecting rod 11 connected with the coupling 14 and corresponds to the fourth positioning key 17; the two fourth positioning keys 17 are circumferentially arranged at a preset angle, and the two stators 4 are arranged in the housing 3 at the same angle. By keeping the same angle of the two stators 4 in the circumferential direction and adjusting the different circumferential angles of the two rotors 5, the first screw pump 1 and the second screw pump 2 have different phase differences in the initial state, namely, the hydraulic amplitude fluctuation between the two are staggered, the hydraulic amplitude between the first screw pump 1 and the second screw pump 2 can be regulated to be complementary in period, the amplitude peaks and the amplitude troughs between the two can be correspondingly counteracted, in particular, the preset angles are 90 or 270 degrees, the two fourth positioning grooves 18 arranged in the coupler 14 are matched with the fourth positioning grooves 18 on the connecting rod 11, and the two fourth positioning grooves 18 on the two connecting rods 11 are separated by a preset angle in the circumferential direction, so that the installation precision is ensured when the rotors 5 connected with the connecting rod 11 are installed in the stator 4, and after the rotors are disassembled and cleaned, the rotors are installed in an auxiliary mode through the auxiliary installation of the positioning structure, the periodical complementary flow can be output by the same combination, and the flow can be stabilized, specifically, the preset angles are 90 or 270 degrees, the flow of the periodical complementary flow can be conveniently counteracted after the first screw pump 1 and the second screw pump 2 are in the corresponding to the pressure peaks and the troughs of the first screw pump and the second screw pump, and the pressure fluctuation of the second screw pump 7 are correspondingly balanced, and the pressure fluctuation of the pressure pump 7 is shown in the figure 9, and the pressure fluctuation flow of the pressure fluctuation of the pump is shown in the figure 9 is obtained.

Specifically, one end of the link 11 remote from the rotor 5 extends into the other end of the coupling 14 and is keyed to the coupling 14.

On the basis of the above embodiment, in a specific embodiment, as shown in fig. 1, each of the first screw pump 1 and the second screw pump 2 further includes a barrel 19, where the barrel 19 is sleeved on the periphery of the connecting rod 11 and is suitable for feeding; the two charging barrels 19 are connected with a feeding pipe 21 through a first tee pipe 20, and one ends of the two stators 4, which are far away from the connecting rod 11, are connected with a discharging pipe 23 through a second tee pipe 22.

It should be noted that, the two barrels 19 are both communicated with the feeding pipe 21 through the first tee pipe 20, and the inner cavities of the two stators 4 are both communicated with the discharging pipe 23 through the first tee pipe 20.

In this embodiment, when the driving assembly drives the first screw pump 1 and the second screw pump 2 to work, the materials enter the feed barrels 19 of the first screw pump 1 and the second screw pump 2 respectively through the feed inlets to the first three-way pipe 20, and pass through the inner cavities of the stators 4, wherein the flows in the two stators 4 are complementary, and finally pass through the second three-way pipe 22 and then are output from the discharge pipe 23, so that the output materials are stable in constant pressure.

Specifically, when the first screw pump 1 and the second screw pump 2 rotate positively, the feeding pipe 21 is fed, and the discharging pipe 23 is discharged; when the first screw pump 1 and the second screw pump 2 are reversed, the feeding pipe 21 discharges and the discharging pipe 23 feeds. The feeding and discharging directions of the feeding pipe 21 and the discharging pipe 23 can be controlled by the rotation directions of the rotors 5 in the first screw pump 1 and the second screw pump 2, and the feeding pipe 21 and the discharging pipe 23 can be used interchangeably.

On the basis of the above embodiment, in a specific embodiment, the speed reducer 9 includes a housing and two gear sets disposed in the housing; the two gear sets are meshed with each other and are respectively connected with an output shaft 10; the servo motor 8 is arranged on the shell and the output end is in driving connection with one of the gear sets.

In this embodiment, one of the gear sets is driven to rotate by the servo motor 8 to drive the other gear set to rotate, so that synchronous rotation of the two output shafts 10 is realized, the first screw pump 1 and the second screw pump 2 are driven by the servo motor 8 in combination with the speed reducer 9, the equipment cost and the installation space are saved, and the control difficulty that the control system needs angle detection and lead-lag adjustment when a plurality of single screw pumps are driven by a plurality of servo motors 8 is simplified.

On the basis of the above embodiment, in a specific embodiment, as shown in fig. 7 to 9, the preset phase difference is 90 degrees or 270 degrees.

When the rotor 5 rotates in the circumferential direction in the stator 4, the liquid pressure gradually increases from 0 to 90 degrees from the output pressure to the output pressure at the lowest value (i.e., amplitude trough) in the period to the output pressure at the maximum value (i.e., amplitude peak), and then gradually decreases from 90 to 180 degrees to the lowest value, thereby periodically fluctuating.

In this embodiment, when the preset phase difference between the first screw pump 1 and the second screw pump 2 is 90 degrees or 270 degrees, that is, when the liquid pressure between the first screw pump 1 and the second screw pump 2 is seen on the fluctuation cycle curve, the liquid pressure fluctuation curves between the first screw pump 1 and the second screw pump 2 are relatively different by 90 degrees or 270 degrees, so that the lowest value (i.e., amplitude trough) in the cycle corresponds to the maximum value (i.e., amplitude peak) in the cycle, the peaks and troughs generated by synchronous rotation of the first screw pump 1 and the second screw pump 2 are offset from each other, and the feed fluctuation is reduced, specifically, as shown in fig. 7 and 8, when the liquid pressure fluctuation outputted by the twin screw feed pump obtained by flow complementation between the first screw pump 1 and the second screw pump 2 is shown in fig. 9.

On the basis of the above embodiment, in a specific embodiment, as shown in fig. 1, a base plate 24 is further included, and the first screw pump 1 and the second screw pump 2 are disposed on the base plate 24.

In this embodiment, the first screw pump 1 and the second screw pump 2 are conveniently arranged through the bottom plate 24, and stability in placing the twin-screw feed pump is improved.

The specific theory of operation of the twin-screw feed pump that this embodiment provided is: through set up location structure in first screw pump 1 and second screw pump 2, guarantee that the angle of two rotors 5 is the same when the installation, two stators 4 are crisscross 90 degrees or 270 degrees in circumference, or guarantee that the angle of two stators 4 is the same when the installation, two rotors 5 are crisscross 90 degrees or 270 degrees in circumference, thereby make the initial state after first screw pump 1 and the second screw pump 2 are installed have 90 degrees or 270 degrees phase difference, thereby the liquid pressure crest of first screw pump 1 and the liquid pressure trough of second screw pump 2 that are in initial state are corresponding, when driving first screw pump 1 and second screw pump 2 synchronous rotation, first screw pump 1 and second screw pump 2 remain this phase difference all the time, the inside flow of first screw pump 1 and second screw pump 2 is periodic complemental in synchronous rotation in-process, keep invariable, be convenient for adjust first screw pump 1 and second screw pump 2 be in initial state's phase difference through location structure, installation precision of first screw pump 1 and second screw pump 2 has been improved, guarantee that invariable feed motor 21 and flexible direction through the flexible feed pipe 23 and the flexible direction of feed pipe 8 that can be passed through the interchangeable, the flexible feed inlet and outlet direction 8. The technical problems that the existing double-screw feeding pump is difficult to adjust when in installation, the two single-screw pumps have preset phase difference in the initial state, the installation accuracy is poor, and constant feeding is affected are solved.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. A twin screw feed pump, characterized by comprising two parallel arranged first screw pumps (1) and second screw pumps (2);

positioning structures are arranged in the first screw pump (1) and the second screw pump (2), and are suitable for enabling a preset phase difference to exist between the first screw pump (1) and the second screw pump (2) in an initial state;

the first screw pump (1) and the second screw pump (2) are both in driving connection with a driving assembly, and the driving assembly is suitable for driving the first screw pump (1) and the second screw pump (2) to synchronously rotate.

2. Twin-screw feed pump according to claim 1, characterized in that the first screw pump (1) and the second screw pump (2) each comprise a housing (3), a stator (4) and a rotor (5); one end of the rotor (5) is in driving connection with the driving assembly, and the other end of the rotor extends into the inner cavity of the stator (4) and is suitable for rotating in the stator (4) to convey materials; the stator (4) is arranged in the shell (3) in a penetrating way.

3. The twin-screw feed pump according to claim 2, characterized in that the positioning structure comprises a first positioning key (6), the first positioning key (6) is arranged on the circumferential side of the stator (4), and a first positioning groove (7) corresponding to the first positioning key (6) is concavely arranged on the inner side of the housing (3); the two first positioning keys (6) are arranged at preset angles in the circumferential direction, and the two rotors (5) are arranged in the stator (4) at the same angle;

or, the positioning structure comprises a first positioning key (6), the first positioning key (6) is arranged on the inner side of the shell (3), and a first positioning groove (7) corresponding to the first positioning key (6) is concavely formed on the periphery of the stator (4); the two first positioning grooves (7) are circumferentially arranged at intervals of a preset angle, and the two rotors (5) are arranged in the stator (4) at the same angle.

4. Twin-screw feed pump according to claim 2, characterized in that the drive assembly comprises a servomotor (8) and a reducer (9), the output of the servomotor (8) is in driving connection with the input of the reducer (9), the reducer (9) is provided with two output shafts (10), and the two output shafts (10) are in driving connection with the two rotors (5) respectively through connecting rods (11).

5. The double-screw feed pump according to claim 4, wherein the positioning structure comprises a second positioning key (12), the second positioning key (12) is arranged on the peripheral side of one end of the connecting rod (11) connected with the rotor (5), and a second positioning groove (13) is arranged in the rotor (5) corresponding to the second positioning key (12); the two second positioning keys (12) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the shell (3) at the same angle;

or, the positioning structure comprises a second positioning key (12), the second positioning key (12) is arranged in one end of the rotor (5) connected with the connecting rod (11), and a second positioning groove (13) is formed in the periphery of one end of the connecting rod (11) connected with the rotor (5) corresponding to the second positioning key (12); the two second positioning grooves (13) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the shell (3) at the same angle.

6. Twin-screw feed pump according to claim 4, characterized in that the output shaft (10) is in driving connection with the connecting rod (11) via a coupling (14); one end of the coupler (14) is connected with the output shaft (10), and the other end is connected with the connecting rod (11).

7. The double-screw feed pump according to claim 6, wherein the positioning structure comprises a third positioning key (15), the third positioning key (15) is arranged on the peripheral side of the output shaft (10), and a third positioning groove (16) is arranged in the coupler (14) corresponding to the third positioning key (15); the two third positioning keys (15) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the shell (3) at the same angle;

or, the positioning structure comprises a third positioning key (15), the third positioning key (15) is arranged in the coupler (14), and a third positioning groove (16) is formed on the periphery of the output shaft (10) corresponding to the third positioning key (15); the two third positioning grooves (16) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the housing (3) at the same angle.

8. The double-screw feed pump according to claim 6, wherein the positioning structure comprises a fourth positioning key (17), the fourth positioning key (17) is arranged on one end circumference side of the connecting rod (11) connected with the coupler (14), and a fourth positioning groove (18) is arranged in the coupler (14) corresponding to the fourth positioning key (17); the two fourth positioning keys (17) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the shell (3) at the same angle;

or, the positioning structure comprises a fourth positioning key (17), the fourth positioning key (17) is arranged in one end of the coupling (14) connected with the connecting rod (11), and a fourth positioning groove (18) is formed in the periphery of one end of the connecting rod (11) connected with the coupling (14) corresponding to the fourth positioning key (17); the two fourth positioning grooves (18) are circumferentially arranged at intervals of a preset angle, and the two stators (4) are arranged in the shell (3) at the same angle.

9. The twin-screw feed pump according to claim 4, characterized in that the first screw pump (1) and the second screw pump (2) each further comprise a barrel (19), the barrels (19) being sleeved on the periphery of the connecting rod (11);

the two charging barrels (19) are connected with a feeding pipe (21) through a first three-way pipe (20), and one ends of the two stators (4) far away from the connecting rod (11) are connected with a discharging pipe (23) through a second three-way pipe (22);

and/or the speed reducer (9) comprises a shell and two gear sets arranged in the shell; two gear sets are meshed with each other and are respectively connected with one output shaft (10); the servo motor (8) is arranged on the shell, and the output end of the servo motor is in driving connection with one of the gear sets.

10. The twin screw feed pump of any of claims 1-9, wherein the preset phase difference is 90 degrees or 270 degrees;

and/or, further comprising a bottom plate (24), said first screw pump (1) and said second screw pump (2) being arranged on said bottom plate (24).