CN215370220U

CN215370220U - Screw pump structure

Info

Publication number: CN215370220U
Application number: CN202121505805.3U
Authority: CN
Inventors: 张丽平; 张海龙; 王杨; 焦喆
Original assignee: Beijilian Harbin Technology Development Co ltd
Current assignee: Beijilian Harbin Technology Development Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2021-12-31
Anticipated expiration: 2031-07-02

Abstract

The utility model relates to a screw pump structure, wherein an upper cover and a lower cover are respectively connected to two ends of a pump body, a pump sleeve is arranged in the pump body, a driving screw and two pairs of driven screws are arranged in the pump sleeve in the pump body, a shaft sleeve, a ball bearing I, a bearing gland, a mechanical seal and a seal gland are sequentially arranged on one side of the driving end of the driving screw and positioned in the upper cover, and the other end of the driving screw is connected with the lower cover through a ball bearing III. The pump shaft seal adopts mechanical seal, a pressure relief sleeve is used for maintaining certain pressure in a seal cavity, the mechanical seal cavity is communicated with a low-pressure cavity, and backflow is formed to take away friction heat of a movable ring and a static ring of the mechanical seal. The pump has the advantages of strong functionality, wide application range, outstanding characteristics, convenient processing and installation and wide application and development prospect.

Description

Screw pump structure

Technical Field

The utility model relates to the technical field of screw pumps, in particular to a screw pump structure.

Background

The screw pump has wide application occasions and development prospects due to the unique structure and functionality, but the screw pump on the market cannot meet specific requirements of certain occasions at present, and is not very convenient to process and install.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a screw pump structure, which solves the problem of inconvenient processing and installation in the prior art.

In order to achieve the purpose, the utility model is realized by the following technical scheme: a screw pump structure comprises a pump body, a driving screw and two pairs of driven screws;

the utility model discloses a pump, including pump body, drive screw rod, bearing gland, mechanical seal and sealing gland, the pump body both ends are connected with upper cover and lower cover respectively, be equipped with the pump housing in the pump body, drive screw rod and two pairs of driven screw rod are in the pump housing of pump body inside, axle sleeve, ball bearing one and bearing gland, mechanical seal and sealing gland are installed in proper order in drive end one side of drive screw rod and the upper cover that is located, the other end of drive screw rod passes through ball bearing three and is connected with the lower cover.

Preferably, both ends of the driven screw are provided with a second ball bearing and a retainer ring.

Preferably, a gland is installed on one side of the pump body, and a cone valve, a valve seat, a valve body, a spring, an adjusting valve, a ball bearing IV, a spring pad and a valve cover are sequentially installed on the corresponding other side.

Preferably, the lower cover is provided with a screw plug.

Advantageous effects

The utility model discloses a screw pump structure, which has the following beneficial effects:

1. the screw pump is of a five-screw structure and comprises a driving screw and four driven screws, and the four driven screws are identical in structure.

2. If impurities exist in the medium, the flow passage is damaged or blocked, and the structure is convenient to clean and repair.

3. The conveyed medium is stirred in the pump and makes continuous linear motion at a constant speed, so that the flow of the pump is stable and no pressure pulsation exists.

4. The screw pump structure of the utility model has the advantages that the five meshed screws and the pump sleeve have sealing performance, so that the pump can exhaust from the suction inlet to the discharge outlet to form good self-suction capacity only when liquid is stored in the pump cavity, and the screw pump does not need a bottom valve or auxiliary vacuum-pumping equipment.

5. According to the screw pump structure, the screw rod in the pump adopts a double-suction structure, and the axial force is automatically balanced.

6. According to the screw pump structure, the pump shaft seal adopts a mechanical seal, the pressure relief sleeve is used for maintaining a certain pressure in the seal cavity, the mechanical seal cavity is communicated with the low-pressure cavity, and the backflow is formed to take away the friction heat of the dynamic ring and the static ring of the mechanical seal.

7. The screw pump structure of the utility model is provided with the safety valve on the pump, when the pressure of the extrusion pipeline exceeds the specified working pressure of the pump, the safety valve is automatically opened, so that the pressure outlet is communicated with the suction inlet to form full reflux, thereby eliminating accidents and ensuring the normal work of the pump and the motor. The total reflux pressure of the safety valve can be adjusted to change the compression amount of the spring for control.

Drawings

FIG. 1 is a schematic view of a screw pump according to the present invention

FIG. 2 side view of a screw pump of the present invention

FIG. 3 is a horizontal sectional view of a progressive cavity pump of the present invention taken from the centerline of the valve body.

In the figure: 1. a driving screw; 2. a driven screw; 3. a pump body; 4. an upper cover; 5. a pump housing; 6. a shaft sleeve; 7. a sealing gland; 8. a bearing gland; 9. mechanical sealing; 10. a first ball bearing; 11. a retainer ring; 12. a second ball bearing; 13. a lower cover; 14. a third ball bearing; 15. a plug screw; 16. a gland; 17. a cone valve; 18. a valve seat; 19. a valve body; 20. a spring; 21. adjusting a valve; 22. a fourth ball bearing; 23. a spring pad; 24. and a valve cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): as shown in fig. 1-3, in a screw pump structure, a pump housing 5 is sleeved on a pump body 3, a main pump screw 1 and four driven screws 2 are respectively installed on the pump housing, ball bearings 12 are respectively sleeved at two ends of the driven screws 2 and then fixed by retaining rings 11, a ball bearing III 14 is sleeved at the lower end of the driving screw 1, and a lower cover is installed on the pump body 3. And then the shaft sleeve 6 is arranged on the upper cover 4, the upper cover is arranged on the pump body 3, the ball bearing I10 is sleeved on a main pump screw rod and is fixed by the bearing cover 8, then the mechanical seal 9 is arranged, and finally the seal gland 7 is used for fixing.

The conical valve 17 is sleeved on the pump body 3, the valve seat 18 is installed on the valve-shaped valve 17, the valve body 19 is installed on the pump body 3, the spring 20, the ball bearing 22 and the spring pad 23 are fixed in the valve body 19 by the adjusting valve 21, and the valve cover 24 is installed.

Finally, the gland 16 is mounted on the pump body 3, and the plug screw 15 is mounted on the lower cover 13.

The working process is as follows: as shown by arrows in figure 1, the screw pump is one of displacement pumps, a plurality of mutually isolated sealed cavities are formed by a driving screw, four driven screws and a pump sleeve, so that a suction cavity is separated from a discharge cavity, and when the driving screw is driven by a motor to rotate, each sealed cavity carries a conveying medium to axially move and is discharged from a suction inlet to a discharge outlet.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A screw pump structure is characterized by comprising a pump body (3), a driving screw (1) and two pairs of driven screws (2);

the utility model discloses a pump body, including pump body (3), two pairs of driven screw (2), drive screw (1) and two pairs of driven screw (4), the pump body is equipped with pump housing (5) in (3), drive screw (1) drive end one side just is located upper cover (4) and installs axle sleeve (6), ball bearing (10) and bearing cover (8), mechanical seal (9) and gland (7) in proper order, the other end of drive screw (1) passes through three (14) of ball bearing and is connected with lower cover (13).

2. A screw pump construction according to claim 1, wherein the driven screw (2) is provided at both ends with a second ball bearing (12) and a retainer ring (11).

3. A screw pump structure according to claim 2, wherein the pump body (3) is provided with a gland (16) on one side and a conical valve (17), a valve seat (18), a valve body (19), a spring (20), a regulating valve (21), a ball bearing assembly (22), a spring washer (23) and a valve cover (24) on the opposite side.

4. A screw pump construction according to claim 3, wherein the lower cap (13) has a plug (15) mounted thereon.