Novel three-screw pump profile
By adopting a point-contact line design and self-lubricating layer composed of involute and arc lines, the resistance problem caused by the local vacuum zone in the screw pump is solved, and efficient and labor-saving medium conveying and large flow pumping are achieved.
Patent Information
- Application Number
- CN202422599483.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The patterned line design between the active screw and the driven screw of the existing screw pump leads to a local vacuum zone, which increases operating resistance and affects the efficient delivery of the medium.
The point-contact line design consisting of involutes and arc lines is adopted, combined with the self-lubricating layer, and linear contact drive is used between the active screw and the driven screw to avoid the formation of local vacuum zones and improve the fit through the self-lubricating layer.
It realizes efficient and labor-saving medium transportation, reduces energy consumption, increases pumping volume, reduces medium fluid leakage, and improves transportation efficiency and pressure.
Smart Images
Figure CN223164695U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of profiles of screw pumps, in particular to a new type of profile of a three-screw pump. Background Art
[0002] Screw pumps are devices commonly used in industries such as petroleum, chemical engineering, and papermaking for transporting viscous liquids or liquids with granular substances. Screw pumps are composed of the meshing of the main and driven screws and the tight fit between the screws and the inner wall of the liner. Between the suction and discharge ports of the pump, one or more sealed spaces will be separated, and then the rotation of the screw is used to achieve the suction and discharge of the liquid. In the existing screw pump, the profile between the spiral push block of the driving screw and the spiral conveying groove of the driven screw is designed as a circular arc in a way of contact on the mating surface (as shown in Figure 6 ), this way will cause a local vacuum area to be formed on the mating surface, resulting in a problem that the resistance of the driving screw increases extremely when running, which is not conducive to the efficient, easy, and fast transportation of the medium. Summary of the Utility Model
[0003] The utility model aims to solve the above-mentioned shortcomings of the prior art, and provides a new type of profile of a three-screw pump that can efficiently and labor-savingly transport the medium with high transportation efficiency, meeting the requirements of transporting the medium through the screw pump efficiently, easily, and with a large pumping pressure.
[0004] The technical solution adopted by the utility model to solve its technical problems: This new type of profile of a three-screw pump includes a driving screw and driven screws located on both sides of the driving screw and meshing together. The driving screw includes a main shaft and a spiral push block spirally fixed on the main shaft. Spiral conveying grooves are opened on both driven screws; the cross-section of the spiral push block includes involute AB and involute CD that are the same on the left and right and symmetrically arranged. An arc line BC is connected between involute AB and involute CD, and an arc line DD concentric with the main shaft is connected between the two involute CD; the cross-section of the spiral conveying groove includes involute EF and straight line GH that are the same on the left and right and symmetrically arranged. An arc line FF concentric with the driven screw is connected between the two involute EF, and an arc line EG is connected between involute EF and straight line GH; involute AB, involute CD and involute EF do not contact, there is point contact between the arc line and arc line FF, point contact between arc line BC and involute EF, and point contact between arc line EG and involute AB; the two straight lines GH on the left and right are arranged in a "V" shape and open. Here, involute AB, involute CD, arc line BC, arc line DD, driven screw, involute EF, straight line GH, arc line FF, and arc line EG can make the profile between the spiral push block of the driving screw and the spiral conveying groove of the driven screw adopt a point contact form, so that it is a linear contact drive during operation, avoiding the local vacuum and extremely increased resistance caused by the traditional fitting method. This transportation method has higher efficiency, lower energy consumption, and larger pumping volume.
[0005] For further improvement, the angle between the left and right straight lines GH is set at 112°. The function of setting the angle between the left and right straight lines GH at 112° is that it is most beneficial for guiding and pushing the medium.
[0006] For further improvement, a self-lubricating layer is provided on the outer contours of the two driven screws. The function of the self-lubricating layer is to make the outer contours of the driven screws fit more closely with the conveying channel, so that during conveying, there is less leakage of the medium, the pump pressure is high, the conveying efficiency is high, and the frictional resistance is small; the self-lubricating layer is made of tin bronze material.
[0007] For further improvement, the diameter of the main shaft is the same as that of the driven screw. The function of making the diameter of the main shaft the same as that of the driven screw is for easy processing.
[0008] The beneficial effects of the present utility model are as follows:
[0009] 1). Through the involute AB, involute CD, circular arc BC, circular arc DD, driven screw, involute EF, straight line GH, circular arc FF, and circular arc EG, the profile between the spiral pushing block of the driving screw and the spiral conveying groove of the driven screw can adopt a point contact form, so that during operation, it is a linear contact drive, avoiding the problems of local vacuum and extremely increased resistance caused by the traditional fitting method. This conveying method has higher efficiency, lower energy consumption, and larger pumping volume.
[0010] 2). By setting the angle between the left and right straight lines GH at 112°, it is more beneficial for guiding and pushing the medium.
[0011] 3). Through the self-lubricating layer, the outer contour of the driven screw can fit more closely with the conveying channel, so that during conveying, there is less leakage of the medium, the pump pressure is high, and the conveying efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a perspective view of the present utility model;
[0013] Figure 2 is a front view of the present utility model;
[0014] Figure 3 is a structural schematic diagram of the present utility model;
[0015] Figure 4 is a structural schematic diagram of the circular arc FF area of the present utility model;
[0016] Figure 5 is a working principle diagram of the present utility model;
[0017] Figure 6 is the profile of a traditional three-screw pump.
[0018] Description of reference numerals: driving screw 1, main shaft 1-1, spiral pushing block 1-2, involute AB 1-2a, involute CD 1-2b, circular arc line BC 1-2c, circular arc line DD 1-2d, driven screw 2, involute EF 2-1a, straight line GH 2-1b, circular arc line FF 2-1c, circular arc line EG 2-1d, self-lubricating layer 2a, conveying medium 3. Specific implementation mode
[0019] The present utility model will be further described below with reference to the accompanying drawings:
[0020] Referring to the accompanying drawings: This new type of three-screw pump profile includes a driving screw 1 and two driven screws 2 located on both sides of the driving screw 1 and meshing with each other. The driving screw 1 includes a main shaft 1-1 and a spiral pushing block 1-2 spirally fixed on the main shaft 1-1. Spiral conveying grooves 2-1 are formed on both driven screws 2; the cross-section of the spiral pushing block 1-2 includes an involute AB 1-2a and an involute CD 1-2b that are the same on the left and right and symmetrically arranged. An arc line BC 1-2c is connected between the involute AB 1-2a and the involute CD 1-2b, and an arc line DD 1-2d concentric with the main shaft 1-1 is connected between the two involute CD 1-2b; the cross-section of the spiral conveying groove 2-1 includes an involute EF 2-1a and a straight line GH 2-1b that are the same on the left and right and symmetrically arranged. An arc line FF 2-1c concentric with the driven screw 2 is connected between the two involute EF 2-1a, and an arc line EG 2-1d is connected between the involute EF 2-1a and the straight line GH 2-1b; the involute AB 1-2a, the involute CD 1-2b and the involute EF 2-1a do not contact each other, the arc line DD 1-2d and the arc line FF 2-1c are in point contact, the arc line BC 1-2c and the involute EF 2-1a are in point contact, and the arc line EG 2-1d and the involute AB 1-2a are in point contact; the two straight lines GH 2-1b on the left and right are arranged in a "V" shape and open.
[0021] The two straight lines GH 2-1b on the left and right are arranged at 112°.
[0022] Self-lubricating layers 2a are arranged on the outer contours of the two driven screws 2.
[0023] The diameter of the main shaft 1-1 is the same as the diameter of the driven screw 2.
[0024] Working principle of the utility model: When pumping a medium, a driving motor (not shown in the figure) drives the rotation of the active screw 1. The rotation of the active screw 1 drives the driven screws 2 on both sides to rotate synchronously in opposite directions. As a result, the arc line BC1-2c drives the rotation of the two driven screws 2. Through the cooperation of the arc line EG2-2d and the involute AB1-2a, the cooperation of the arc line BC1-2c and the involute EF2-1a, and the cooperation of the arc line DD1-2d and the arc line FF2-1c, the profile line during the operation between the active screw 1 and the driven screw 2 adopts a line contact method, and no local vacuum area will be formed when transporting the medium. Therefore, the operation is more relaxed, labor-saving, and efficient. Moreover, through the dot-like cooperation relationship of the cross-sectional states of the arc line BC1-2c, the arc line DD1-2d, the arc line FF2-1c, and the arc line EG2-1d, sealed cavities are formed between the involute AB1-2a and the involute EF2-1a, and between the involute CD1-2b and the involute EF2-1a. Thus, not only is the local vacuum state generated during the transportation of the medium avoided, but also the resistance is greatly increased. It also makes the leakage amount less during the operation of the three-screw pump, the pumping pressure greater, and the transported medium more, which is more conducive to the high-efficiency and high-pressure pumping of the medium (as Figure 5 shown), and it is worthy of popularization and application.
[0025] Although the utility model has been illustrated and described by referring to the preferred embodiments, those of ordinary skill in the art should understand that various changes in form and details can be made within the scope of the claims.
Claims
1. A new type of profile for a three-screw pump, comprising a driving screw (1) and driven screws (2) located on both sides of the driving screw (1) and meshing with each other, characterized in that: The driving screw (1) includes a main shaft (1-1) and a spiral pushing block (1-2) spirally fixed on the main shaft (1-1). Spiral conveying grooves (2-1) are formed on both of the driven screws (2). The cross-section of the spiral pushing block (1-2) includes involute AB (1-2a) and involute CD (1-2b) which are identical on the left and right and symmetrically arranged. An arc line BC (1-2c) is connected between the involute AB (1-2a) and the involute CD (1-2b). An arc line DD (1-2d) concentric with the main shaft (1-1) is connected between the two involute CD (1-2b). The cross-section of the spiral conveying groove (2-1) includes involute EF (2-1a) and straight line GH (2-1b) which are identical on the left and right and symmetrically arranged. An arc line FF (2-1c) concentric with the driven screw (2) is connected between the two involute EF (2-1a). An arc line EG (2-1d) is connected between the involute EF (2-1a) and the straight line GH (2-1b). The involute AB (1-2a), the involute CD (1-2b) and the involute EF (2-1a) do not contact. There is a point contact between the arc line DD (1-2d) and the arc line FF (2-1c). There is a point contact between the arc line BC (1-2c) and the involute EF (2-1a). There is a point contact between the arc line EG (2-1d) and the involute AB (1-2a). The left and right straight lines GH (2-1b) are arranged in a "V" shape and open.
2. The profile of a new type of three-screw pump according to claim 1, characterized in that: The left and right straight lines GH (2-1b) are arranged at an angle of 112°.
3. A new type of three-screw pump profile according to claim 1, characterized in that: Self-lubricating layers (2a) are provided on the outer contours of the two driven screws (2).
4. A novel profile of a three-screw pump according to claim 1, characterized in that: The diameter of the main shaft (1-1) is the same as the diameter of the driven screw (2).