CN216950840U

CN216950840U - Small flow liquid pump

Info

Publication number: CN216950840U
Application number: CN202220067059.2U
Authority: CN
Inventors: 吴兴君
Original assignee: Suzhou Leibo'ao Biotechnology Co ltd
Current assignee: Suzhou Leibo'ao Biotechnology Co ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-07-12
Anticipated expiration: 2032-01-11

Abstract

The utility model discloses a small flow liquid pump, comprising: superpose back base, fixed plate and preceding base in proper order, be provided with an external gear in the mounting hole, the pivot passes the region of mounting hole on the cover be equipped with one with external gear complex internal gear, can follow the number of teeth of pivot pivoted internal gear is less than the number of teeth and external gear center of rotation and internal gear center of rotation and does not coincide to the both sides that lie in internal gear and external gear meshing department between internal gear, the external gear form first liquid storehouse, second liquid storehouse, preceding base is provided with the feed liquor groove that communicates with first liquid chamber, second liquid chamber towards fixed plate one side on the surface and lie in the mounting groove both sides, goes out the liquid groove. The utility model can realize small flow and stable output of liquid, and can ensure consistent dosage of the liquid output each time, thereby ensuring accurate control of the output liquid quantity.

Description

Small flow liquid pump

Technical Field

The utility model relates to a small-flow liquid pump, and belongs to the technical field of fluid control.

Background

The gear pump is a common hydraulic pump in a hydraulic transmission system, and can be divided into an internal gear pump and an external gear pump according to a gear meshing mode. The internal gear pump adopts the principle of internal gear meshing, and a driving internal gear on a main shaft drives an external gear (namely an external rotor and a balance wheel) to rotate in the same direction. The two gears are separated from each other at the inlet to form negative pressure to suck liquid, and the two gears are continuously embedded and meshed at the outlet to extrude and output the liquid. The change of the volume of the space formed by the matching of the two corresponding gears is circulated once, so that the material suction and the material discharge are realized once respectively. However, the gear pump in the prior art is mostly a large hydraulic pump used in the industrial field, and cannot be applied to the small flow liquid supply field, such as the biomedical and fine chemical fields.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a small-flow liquid pump which can realize small-flow and stable output of liquid and can ensure that the dosage of the liquid output each time is consistent, thereby ensuring the accurate control of the amount of the liquid output.

In order to achieve the purpose, the utility model adopts the technical scheme that: a small flow liquid pump comprising: the device comprises a rear base, a fixed plate and a front base which are sequentially superposed, wherein the other end of a rotating shaft, one end of which is connected with a driving mechanism, penetrates through a through hole in the rear base and the fixed plate and then is embedded into a mounting groove in the front base;

can follow the number of teeth of pivot pivoted internal gear is less than the number of teeth and the external gear rotation center of its driven external gear and internal gear rotation center do not coincide to between internal gear, the external gear and lie in the both sides of internal gear and external gear meshing department and form first liquid chamber, second liquid chamber, preceding base orientation fixed plate one side on the surface and lie in the mounting groove both sides be provided with first liquid chamber, the feed liquor groove of second liquid chamber intercommunication, go out the liquid groove, open on the opposite side surface of preceding base have with feed liquor groove, go out liquid inlet, the liquid outlet of liquid groove intercommunication.

The further improved scheme in the technical scheme is as follows:

1. in the above scheme, the four corners of the rear base, the fixing plate and the front base are fixedly connected through bolts.

2. In the above scheme, the through hole and the mounting groove are correspondingly arranged in the centers of the rear base and the front base.

3. In the scheme, one end of the rotating shaft is connected with an output shaft of the stepping motor through the coupler.

4. In the above solution, the rotation center of the external gear is located directly below the rotation center of the internal gear, and the meshing position of the internal gear and the external gear is located directly above the rotation center of the internal gear.

5. In the above scheme, the first liquid chamber and the second liquid chamber are arranged in axial symmetry.

6. In the above scheme, the liquid inlet and the liquid outlet are communicated with the middle parts of the liquid inlet tank and the liquid outlet tank correspondingly.

7. In the above scheme, the surfaces of the rear base and the front base facing the fixing plate are respectively provided with an annular groove embedded with a sealing ring.

8. In the scheme, the sealing ring concentric with the outer gear is positioned on the outer side of the edge of the mounting through hole.

9. In the above scheme, the number of teeth of the outer gear is 8, and the number of teeth of the inner gear is 7.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the small-flow liquid pump can realize small-flow and stable output of liquid, and can ensure that the dosage of the liquid output each time is consistent, thereby ensuring the accurate control of the amount of the liquid output.

Drawings

FIG. 1 is a schematic view of a small flow liquid pump according to the present invention;

FIG. 2 is an exploded view of the low flow liquid pump of the present invention;

FIG. 3 is an exploded view of a portion of the small flow liquid pump of the present invention at one viewing angle;

FIG. 4 is a front view of the structure of FIG. 3;

FIG. 5 is a partially exploded view of the small flow liquid pump of the present invention from another perspective;

fig. 6 is a front view of the structure of fig. 5.

In the drawings above: 1. a rear base; 2. a fixing plate; 3. a front base; 4. a rotating shaft; 5. a through hole; 6. mounting grooves; 7. mounting a through hole; 81. an outer gear; 82. an internal gear; 91. a first liquid chamber; 92. a second fluid chamber; 11. a liquid inlet tank; 12. a liquid outlet groove; 13. a liquid inlet; 14. a liquid outlet; 15. a coupling; 16. a stepping motor; 17. a seal ring; 18. an annular groove; 19. mounting a shell; 20. and a bearing.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; 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 meaning of the above terms in this patent may be understood in a concrete sense to those of ordinary skill in the art.

Example 1: a small flow liquid pump comprising: the rear base 1, the fixed plate 2 and the front base 3 are sequentially overlapped, the other end of a rotating shaft 4 with one end connected with a driving mechanism penetrates through a through hole 5 on the rear base 1 and the fixed plate 2 and then is embedded into a mounting groove 6 on the front base 3, the rotating shaft 4 is in rotating fit with the through hole 5 and the respective inner wall of the mounting groove 6, a mounting through hole 7 which is through from front to back is formed in the fixed plate 2, an outer gear 81 which is in rotating fit with the inner wall of the mounting through hole 7 is arranged in the mounting through hole 7, and an inner gear 82 which is matched with the outer gear 81 is sleeved on the region where the rotating shaft 4 penetrates through the mounting through hole 7;

the number of teeth of the internal gear 82 which can rotate along with the rotating shaft 4 is less than that of teeth of the external gear 81 driven by the internal gear 82, and the rotation center of the external gear 81 is not coincident with that of the internal gear 82, the external gear 81 and the two sides of the meshing position of the internal gear 82 and the external gear 81 form a first liquid cavity 91 and a second liquid cavity 92, the surface of the front base 3 facing one side of the fixed plate 2 and positioned on two sides of the mounting groove 6 are provided with a liquid inlet groove 11 and a liquid outlet groove 12 communicated with the first liquid cavity 91 and the second liquid cavity 92, and the other side surface of the front base 3 is provided with a liquid inlet 13 and a liquid outlet 14 communicated with the liquid inlet groove 11 and the liquid outlet groove 12.

The four corners of the rear base 1, the fixed plate 2 and the front base 3 are fixedly connected through bolts; the through hole 5 and the mounting groove 6 are correspondingly arranged in the centers of the rear base 1 and the front base 3; one end of the rotating shaft 4 is connected with an output shaft of a stepping motor 16 through a coupler 15;

the rotation center of the external gear 81 is positioned right below the rotation center of the internal gear 82, and the meshing position of the internal gear 82 and the external gear 81 is positioned right above the rotation center of the internal gear 82; the first liquid chamber 91 and the second liquid chamber 92 are disposed in axial symmetry; the liquid inlet 13 and the liquid outlet 14 are correspondingly communicated with the middle parts of the liquid inlet tank 11 and the liquid outlet tank 12.

Example 2: a small flow liquid pump comprising: the rear base 1, the fixed plate 2 and the front base 3 are sequentially overlapped, the other end of a rotating shaft 4 with one end connected with a driving mechanism penetrates through a through hole 5 on the rear base 1 and the fixed plate 2 and then is embedded into a mounting groove 6 on the front base 3, the rotating shaft 4 is in rotating fit with the through hole 5 and the respective inner wall of the mounting groove 6, a mounting through hole 7 which is through from front to back is formed in the fixed plate 2, an outer gear 81 which is in rotating fit with the inner wall of the mounting through hole 7 is arranged in the mounting through hole 7, and an inner gear 82 which is matched with the outer gear 81 is sleeved on the region where the rotating shaft 4 penetrates through the mounting through hole 7;

the number of teeth of the internal gear 82 which can rotate along with the rotating shaft 4 is less than that of teeth of the external gear 81 driven by the internal gear 82, and the rotation center of the external gear 81 is not coincident with that of the internal gear 82, the external gear 81 and the two sides of the meshing position of the internal gear 82 and the external gear 81 form a first liquid chamber 91 and a second liquid chamber 92, the surface of the front base 3 facing one side of the fixed plate 2 and positioned on two sides of the mounting groove 6 are provided with a liquid inlet groove 11 and a liquid outlet groove 12 communicated with the first liquid chamber 91 and the second liquid chamber 92, and the other side surface of the front base 3 is provided with a liquid inlet 13 and a liquid outlet 14 communicated with the liquid inlet groove 11 and the liquid outlet groove 12.

The surfaces of the rear base 1 and the front base 3 facing the fixing plate 2 are respectively provided with an annular groove 18 embedded with a sealing ring 17; the seal ring 17 concentric with the external gear 81 is positioned outside the edge of the mounting through hole 7; the number of teeth of the external gear 81 is 8, and the number of teeth of the internal gear 82 is 7;

a mounting shell 19 with one end connected with the stepping motor 16 is arranged outside the coupling 15, the other end of the mounting shell 19 is fixedly connected with the rear base 1, and the rotating shaft 4 is rotatably connected with the rear base 1 through a bearing 20;

the liquid pump is small in size, power is from the stepping motor, the rotating angle can be well controlled, the flow of liquid is controlled through the gear, the stepping motor enables the response time to reach a millisecond level through software control, and the transmission speed can also be adjusted through software, so that the spraying distance of the liquid is controlled.

When the small-flow liquid pump is adopted, the small-flow and stable output of liquid can be realized, and the consistency of the dosage of the output liquid every time can be ensured, so that the accurate control of the output liquid quantity is ensured.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A small flow liquid pump comprising: rear base (1), fixed plate (2) and preceding base (3) of superpose in proper order, its characterized in that: the other end of a rotating shaft (4) with one end connected with a driving mechanism penetrates through a through hole (5) in a rear base (1) and a fixing plate (2) and then is embedded into a mounting groove (6) in a front base (3), the rotating shaft (4) is in rotating fit with the through hole (5) and the respective inner wall of the mounting groove (6), a mounting through hole (7) which is through from front to back is formed in the fixing plate (2), an outer gear (81) which is in rotating fit with the inner wall of the mounting through hole (7) is arranged in the mounting through hole (7), and an inner gear (82) which is matched with the outer gear (81) is sleeved on the region of the rotating shaft (4) which penetrates through the mounting through hole (7);

can follow the number of teeth of pivot (4) pivoted internal gear (82) is less than the number of teeth and external gear (81) rotation center and internal gear (82) rotation center noncoincidence of its driven external gear (81) to at internal gear (82), between external gear (81) and be located the both sides of internal gear (82) and external gear (81) meshing department and form first liquid chamber (91), second liquid chamber (92), preceding base (3) are provided with liquid inlet tank (11), liquid outlet tank (12) with first liquid chamber (91), second liquid chamber (92) intercommunication towards on the surface of fixed plate (2) one side and lie in mounting groove (6) both sides, open on the other side surface of preceding base (3) inlet (13), liquid outlet tank (14) with liquid inlet tank (11), liquid outlet tank (12) intercommunication.

2. The small-flow liquid pump according to claim 1, characterized in that: the four corners of the rear base (1), the fixed plate (2) and the front base (3) are fixedly connected through bolts.

3. The small-flow liquid pump according to claim 1, characterized in that: the through hole (5) and the mounting groove (6) are correspondingly arranged in the centers of the rear base (1) and the front base (3).

4. The small-flow liquid pump according to claim 1, characterized in that: one end of the rotating shaft (4) is connected with an output shaft of the stepping motor (16) through a coupler (15).

5. The small-flow liquid pump according to claim 1, characterized in that: the rotation center of the external gear (81) is positioned right below the rotation center of the internal gear (82), and the meshing position of the internal gear (82) and the external gear (81) is positioned right above the rotation center of the internal gear (82).

6. The small-flow liquid pump according to claim 1, characterized in that: the first liquid chamber (91) and the second liquid chamber (92) are arranged in axial symmetry.

7. The small-flow liquid pump according to claim 1, characterized in that: the liquid inlet (13) and the liquid outlet (14) are communicated with the middle parts of the liquid inlet groove (11) and the liquid outlet groove (12) correspondingly.

8. The small-flow liquid pump according to claim 1, characterized in that: the surface of each of the rear base (1) and the front base (3) facing the fixing plate (2) is provided with an annular groove (18) embedded with a sealing ring (17).

9. The small-flow liquid pump according to claim 8, characterized in that: the sealing ring (17) concentric with the external gear (81) is positioned on the outer side of the edge of the mounting through hole (7).

10. The small-flow liquid pump according to claim 1, characterized in that: the number of teeth of the outer gear (81) is 8, and the number of teeth of the inner gear (82) is 7.