CN210178570U - Cantilever type single-suction small-flow double-screw pump - Google Patents
Cantilever type single-suction small-flow double-screw pump Download PDFInfo
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- CN210178570U CN210178570U CN201920387647.2U CN201920387647U CN210178570U CN 210178570 U CN210178570 U CN 210178570U CN 201920387647 U CN201920387647 U CN 201920387647U CN 210178570 U CN210178570 U CN 210178570U
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Abstract
The utility model relates to a cantilever type single-suction small-flow double-screw pump, which comprises a pump body, a driving shaft and a driven shaft which are arranged in the pump body in parallel, wherein the driving shaft is provided with a left-handed screw sleeve, the driven shaft is provided with a right-handed screw sleeve, the driving shaft and the driven shaft are arranged on a bearing seat through a needle bearing and three rows of angular contact ball shafts, and the pump body is also fixed on the bearing seat through a fastening bolt; the bearing seat and the gear box supported by the driving shaft and the driven shaft are arranged on one side of the pump body, and only two spiral sleeves and a single-suction structure are arranged. The beneficial effects of the utility model are that the mechanism is compact, and every pump only needs two sets of mechanical seal, reduces the mounting dimension and the weight of pump, reduces the manufacturing cost of pump for at the special application occasion of low pressure low discharge, can use this kind of special construction's twin-screw pump to realize fluid transport.
Description
Technical Field
The utility model discloses a belong to two screw pump technical field, especially relate to a little discharge two screw pump is inhaled to cantilever type list.
Background
At present, the double-screw pump in the market at home and abroad is divided into a general type, a high-temperature type, a high-pressure type and the like, and has different structural forms of vertical installation, horizontal installation and the like. The high-temperature double-screw pump belongs to a long shaft series; the high-pressure double-screw pump belongs to the heavy-load series of thick shafts, and is out of the patent comparison range of the pump. At present, the general series horizontal or vertical twin-screw pump is used under the general working condition that the temperature of the conveying medium is less than or equal to 150 ℃ and the pressure is less than or equal to 60 bar.
However, in some special working condition applications, such as food, hygiene, pharmacy and daily chemical applications, a chemical, especially fine chemical dosing device is also provided, and in the processes of oil and gas production, subpackaging and the like, fluid delivery needs to use good self-absorption performance of a double-screw pump, the double-screw pump needs to be suitable for delivering high-viscosity media, but the actual delivery temperature is less than or equal to 100 ℃, the pressure is less than or equal to 12bar, the discharge capacity (0.5-30m3/hr), the design requirement of the commonly configured double-screw pump is far higher than the actual requirement, and therefore the pump has the defects of high manufacturing cost, large installation size, excessive weight, relatively low use efficiency and the like. In order to meet the specific working conditions, a cantilever type single-suction small-flow double-screw pump is urgently needed to be developed.
The biggest problem of the above-mentioned pump is that there is only one screw sleeve on each shaft, and there is a pressure difference between the inlet and outlet, which, in addition to acting on the screw sleeve, produces a radial force, it also produces a large continuous axial load. Compared with other screw pumps with double-support axial hydraulic pressure self-balancing layout structures, the most difficult and unsolved design is the design of a variable continuous heavy-load axial force balancing shafting and a special bearing support layout so as to meet the working condition.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a cantilever type is singly inhaled small discharge double-screw pump, the purpose is the conveying efficiency who improves the pump, reduces the mounting dimension and the weight of pump, reduces the manufacturing cost of pump.
The technical scheme of the utility model is that:
a cantilever type single-suction small-flow double-screw pump comprises a pump body, a bearing seat, a gear box, a driving shaft and a driven shaft which are arranged in the pump body in parallel; the single side of the bearing block is arranged on one side of the pump body, the pump body is fixed on the bearing block, and the driving shaft and the driven shaft are provided with matched screw sleeves; and the driving shaft and the driven shaft are arranged on the driving end of the bearing seat through three rows of angular contact ball bearings.
Compared with the prior art, the scheme is provided with the bearing seat which is arranged on the single side and has the supporting function, the pump body which is fixed on the bearing seat and the matched spiral sleeves which are arranged on the driving shaft and the driven shaft, and the driving shaft and the driven shaft can bear bidirectional axial force and large radial force through the arrangement of three rows of angular contact ball bearings; because the driving shaft and the driven shaft adopt cantilever type supporting structures, the whole shaft system, a fixing mode and a double-supporting structure are correspondingly adjusted and optimized; the limited load of the working condition does not exceed 16bar, and the diameter of the screw can be further reduced compared with the general structure; the bearing seats are arranged on one side, so that the structure of the pump is more compact, parts are saved, and compared with a pump with a general structure which needs two bearing seats, four sets of mechanical seals and four spiral sleeves; according to the technical scheme, only one bearing seat is needed, and two sets of mechanical seals and two spiral sleeves are needed.
Based on the above scheme, the utility model discloses following improvement has still been made:
further, the shaft diameter d of the driving shaft and the driven shaft at the mechanical seal positionjAxial diameter d of the screw sleevelIs dj/dl1.37-1.45. In the technical improvement, in order to bear larger axial load, the shaft diameter d of the mechanical seal partjAxial diameter d of specific screw sleevelThe thickened design enables the cantilever structure shaft system to bear larger axial load, and the reliability of the pump is improved.
Furthermore, needle roller bearings are installed at the mechanical seal positions of the driving shaft and the driven shaft and the bearing seat. In the technical improvement, a needle bearing is selected at the mechanical seal position of the bearing, so that the position can bear corresponding load and has a proper installation space.
Furthermore, when the inlet direction of the pump body is positioned in the axial direction and the outlet direction of the pump body is positioned above the shaft, the three rows of angular contact ball bearings bear rightward load force; if the inlet direction of the pump body is positioned above the shaft, and the outlet direction of the pump body is positioned in the axial direction, the three rows of angular contact ball bearings bear leftward load force.
Further, the ratio Ic of the spiral sleeve groove depth T to the spiral sleeve excircle diameter Dw is 0.29-0.31, wherein the spiral sleeve groove depth T is (Dw-Df)/2, and Df is the spiral sleeve base circle diameter. In the technical scheme, the shaft diameter is reduced, so that the groove depth is correspondingly increased, and the conveying capacity of the pump can be further improved.
Further, the ratio Id of the excircle diameter Dw of the spiral sleeve to the length L of the spiral sleeve is 1.2-1.4.
Furthermore, the pump also comprises an overflow valve which is positioned behind the inlet and below the outlet of the pump body.
The utility model has the advantages that: the whole mechanism is compact, each pump only needs two sets of mechanical seals, the installation size and the weight of the pump are reduced, the manufacturing cost of the pump is reduced, and the double-screw pump with the special structure can be used for conveying fluid in special application occasions with low pressure and small flow.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic sectional view of the present invention;
fig. 3 shows an inlet/outlet fluid direction embodiment 1 of the present invention;
fig. 4 is a layout view of the axial load and bearing corresponding to fig. 3 according to the present invention;
fig. 5 shows an inlet/outlet fluid direction embodiment 2 of the present invention;
fig. 6 is a layout view of the axial load and the bearing corresponding to fig. 5.
In the figure, 1, a pump body; 2. a bearing seat; 3. a gear case; 4. a drive shaft; 5. a driven shaft; 6. a left helical casing; 7. a right helical casing; 8. angular contact ball bearings; 9. a needle bearing; 10. an overflow valve; 11. an inlet flange; 12. an outlet flange.
Detailed Description
As shown in fig. 1 and 2, a cantilever type single-suction small-flow double-screw pump comprises a pump body 1, a bearing seat 2, a gear box 3, a driving shaft 4 and a driven shaft 5 which are arranged in the pump body 1 in parallel; the bearing seat 2 is arranged on one side of the pump body 1 on one side, and the pump body 1 is fixed on the bearing through a fastening boltOn the seat 2, the driving shaft 4 and the driven shaft 5 are provided with screw sleeves which are matched with each other; wherein, a left-handed screw sleeve 6 is arranged on the driving shaft 4 through spline matching, and a right-handed screw sleeve 7 is arranged on the driven shaft 5. The driving shaft 4 and the driven shaft 5 are arranged on the driving end of the bearing seat 2 through three rows of angular contact ball bearings 8; needle roller bearings 9 are arranged at the mechanical sealing positions of the driving shaft 4 and the driven shaft 5 and the bearing seat 2. An overflow valve 10 can be selected according to requirements, and the overflow valve 10 is positioned behind an inlet and below an outlet of the pump body 1. The shaft diameter d of the driving shaft 4 and the driven shaft 5 at the mechanical seal positionjAxial diameter d of the screw sleevelIs dj/dl1.37-1.45. The ratio Ic of the groove depth T of the screw sleeve 6 and 7 to the diameter Dw of the excircle of the screw sleeve is 0.29-0.31, wherein the groove depth T of the screw sleeve is (Dw-Df)/2, and Df is the diameter of the bottom circle of the screw sleeve. The ratio Id of the excircle diameter Dw of the spiral sleeve to the length L of the spiral sleeve is 1.2-1.4.
As shown in fig. 2 and 3, the cantilever type single-suction small-flow twin-screw pump is mainly different from other series of twin-screw pumps in that a layout of two screw sleeves and a single-suction structure is adopted; the pump can generate large axial force no matter the direction of the inlet and the outlet of the pump is axial inlet and outlet or the arrangement of the inlet and the outlet, and the axial force is generated when the pressure difference between the inlet and the outlet acts on the axial section of the spiral sleeve; therefore, a supporting structure for balancing the left or right axial force is required in the shafting support. The installation layout of the specific single-row angular contact bearing is shown in the structural schematic diagrams of fig. 3-6, according to the newton's third law, the acting force and the reacting force are equal in magnitude and opposite in direction, and on the same straight line, as shown in fig. 3, if the inlet direction is in the axial direction and the outlet direction is above, the generated axial force is leftward, the bearing layout needs to bear rightward load so as to balance the leftward axial load generated when the rotor works, as shown in fig. 4, two rows of angular contact ball bearings bear rightward load, and one row of angular contact ball bearings bear leftward load; if the inlet direction is at the upper side and the outlet direction is at the axial direction, as shown in fig. 5, a rightward axial force is generated, and the bearing layout needs to bear a leftward load so as to balance the rightward axial force generated when the rotor works; as shown in fig. 6, the angular ball bearings of two rows receive a load to the left, and the angular ball bearings of one row receive a load to the right.
Claims (5)
1. A cantilever type single-suction small-flow double-screw pump comprises a pump body, a bearing seat, a gear box, a driving shaft and a driven shaft which are arranged in the pump body in parallel; the method is characterized in that: the single side of the bearing block is arranged on one side of the pump body, the pump body is fixed on the bearing block, and the driving shaft and the driven shaft are provided with matched screw sleeves; the driving shaft and the driven shaft are arranged on the driving end of the bearing seat through three rows of angular contact ball bearings; the shaft diameter d of the driving shaft and the driven shaft at the mechanical seal positionjAxial diameter d of the screw sleevelIs dj/dl1.37-1.45; the ratio Ic of the spiral sleeve groove depth T to the spiral sleeve excircle diameter Dw is 0.29-0.31, wherein the spiral sleeve groove depth T is (Dw-Df)/2, and Df is the spiral sleeve bottom circle diameter.
2. The cantilevered single suction low flow twin screw pump of claim 1 wherein: and needle bearings are arranged at the mechanical seal positions of the driving shaft, the driven shaft and the bearing seat.
3. The cantilevered single suction low flow twin screw pump of claim 1 wherein: when the inlet direction of the pump body is positioned in the axial direction and the outlet direction of the pump body is positioned above the shaft, the three rows of angular contact ball bearings bear rightward load force; if the inlet direction of the pump body is positioned above the shaft, and the outlet direction of the pump body is positioned in the axial direction, the three rows of angular contact ball bearings bear leftward load force.
4. The cantilevered single suction low flow twin screw pump of claim 1 wherein: the ratio Id of the excircle diameter Dw of the spiral sleeve to the length L of the spiral sleeve is 1.2-1.4.
5. The cantilevered single suction low flow twin screw pump of claim 1 wherein: the overflow valve is positioned behind the inlet and below the outlet of the pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920387647.2U CN210178570U (en) | 2019-03-26 | 2019-03-26 | Cantilever type single-suction small-flow double-screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920387647.2U CN210178570U (en) | 2019-03-26 | 2019-03-26 | Cantilever type single-suction small-flow double-screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210178570U true CN210178570U (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920387647.2U Active CN210178570U (en) | 2019-03-26 | 2019-03-26 | Cantilever type single-suction small-flow double-screw pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210178570U (en) |
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2019
- 2019-03-26 CN CN201920387647.2U patent/CN210178570U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210104 Address after: 062150 north side of Zhenggang Road, Botou Industrial Zone, Cangzhou City, Hebei Province Patentee after: HEBEI HENGSHENG PUMPS Co.,Ltd. Address before: 515 Jinniushan Road, Muping District, Yantai City, Shandong Province Patentee before: SHANDONG LAWRENCE FLUID TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |