CN220372607U - Screw pump spiral sleeve pre-tightening device - Google Patents
Screw pump spiral sleeve pre-tightening device Download PDFInfo
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- CN220372607U CN220372607U CN202321026969.7U CN202321026969U CN220372607U CN 220372607 U CN220372607 U CN 220372607U CN 202321026969 U CN202321026969 U CN 202321026969U CN 220372607 U CN220372607 U CN 220372607U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 230000006835 compression Effects 0.000 claims abstract description 6
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- 230000001066 destructive effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
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Abstract
The utility model discloses a screw pump screw sleeve pre-tightening device, which belongs to the technical field of screw pump processing and comprises a support sleeve, wherein a transmission shaft axially and horizontally penetrates through the support sleeve, a screw sleeve is arranged on the transmission shaft arranged in the support sleeve, and clamping nuts are arranged on the transmission shafts at two ends of the screw sleeve; one end of the supporting sleeve is provided with a pressing plate sleeved on the transmission shaft, the pressing plate is abutted with the supporting sleeve, and the transmission shaft at the outer side of the pressing plate is provided with a compression nut; the other end of the support sleeve opposite to the pressing plate is provided with a stretching head which is in threaded connection with the transmission shaft, the stretching head is provided with a hydraulic stretcher, the end face of a piston of the hydraulic stretcher is abutted against the stretching head, the end face of a cylinder body of the hydraulic stretcher is abutted against the support sleeve through a support ring, and the hydraulic stretcher is connected with an external hydraulic pump through a quick-change connector. The screw sleeve pre-tightening torque can be accurately controlled, destructive torsion load is not brought, and damage to the clamping nut and the transmission shaft is avoided.
Description
Technical Field
The utility model belongs to the technical field of screw pump processing, and particularly relates to a screw sleeve pre-tightening device of a screw pump.
Background
The double-screw pump is a rotary pump which conveys liquid or pressurizes the liquid by means of the volume change and movement of an engagement space formed by the pump body and the screw, and when the driving screw rotates, the driving screw simultaneously drives the driven screw engaged with the driving screw to rotate together, the volume of the screw engagement space at one end of the suction cavity is gradually increased, and the pressure is reduced; when the volume is increased to form a sealed cavity, the liquid continuously moves axially in each sealed cavity until reaching one end of the discharging cavity, and the volume of the screw engaging space at one end of the discharging cavity is gradually reduced to discharge the liquid.
In the traditional screw pump screw sleeve pre-tightening process, screw sleeve pre-tightening is usually realized by knocking a wrench or a torque wrench, and the pre-tightening method has the following defects: 1. the pretightening moment of the spiral sleeve cannot be accurately controlled; 2. destructive torsion load can be generated, the clamping nut and the transmission shaft are easy to damage, the clamping nut is damaged and cannot be disassembled, and hidden dangers such as deformation of the transmission shaft can be caused.
Disclosure of Invention
Aiming at the problems existing in the prior art, the screw pump screw sleeve pre-tightening device provided by the utility model can accurately control the screw sleeve pre-tightening moment, only generates axial tensile load, does not bring destructive torsion load, and avoids the damage of a clamping nut and a transmission shaft, thereby obtaining high-quality assembly.
The screw pump screw sleeve pre-tightening device comprises a support sleeve, wherein a transmission shaft horizontally penetrates through the support sleeve along the axial direction, a screw sleeve is arranged on the transmission shaft arranged in the support sleeve, and clamping nuts for pre-tightening the screw sleeve are arranged on the transmission shafts at two ends of the screw sleeve;
one end of the supporting sleeve is provided with a pressing plate sleeved on the transmission shaft, the pressing plate is abutted against the supporting sleeve, and the transmission shaft at the outer side of the pressing plate is provided with a compression nut for limiting the position of the pressing plate; the hydraulic stretching device is characterized in that a stretching head which is in threaded connection with the transmission shaft is arranged at the other end of the supporting sleeve opposite to the pressing plate, a hydraulic stretching device is arranged on the stretching head, the end face of a piston of the hydraulic stretching device is abutted against the stretching head, the end face of a cylinder body of the hydraulic stretching device is abutted against the supporting sleeve through a supporting ring, and the hydraulic stretching device is connected with an external hydraulic pump through a quick-change connector.
Further, an adjusting notch for adjusting the clamping nut is formed in the support sleeve opposite to the clamping nut, and an operating tool conveniently stretches into the support sleeve to adjust the clamping nut through the adjusting notch.
Further, an annular clamping groove for clamping the support sleeve is formed in the end face of the pressing plate, which is abutted against the support sleeve. The support sleeve and the pressing plate can be abutted more stably, the connection reliability in the stretching process is ensured, and the damage to equipment and parts caused by the separation of the support sleeve and the pressing plate in the stretching process is avoided.
Further, the stretching head comprises a force bearing part and an installation part, a threaded through hole which is horizontally communicated is arranged in the stretching head, the diameter of the force bearing part is larger than that of the installation part, the hydraulic stretcher is installed on the installation part, and the end face of a piston of the hydraulic stretcher is abutted to the force bearing surface of the force bearing part.
The utility model has the advantages and technical effects that: by adopting the technical scheme, the hydraulic source provided by the hydraulic pump is used for determining the stretching force according to the tensile strength, the yield coefficient and the elongation of the material, and the stretching force generated by the hydraulic pump is used for elongating the transmission shaft with the applied force in the elastic deformation area of the transmission shaft, so that the diameter of the transmission shaft is slightly deformed, and the clamping nut is used for locking the spiral sleeve. The transmission shaft is lengthened by pure tension, friction damage is avoided to the connected contact surface, and the pretightening moment of the spiral sleeve can be accurately controlled; only axial tensile load is generated, destructive torsion load is not brought, and damage to the clamping nut and the transmission shaft is avoided, so that high-quality assembly is obtained.
Drawings
FIG. 1 is a schematic view of the overall structure provided by an embodiment of the present utility model;
FIG. 2 is a schematic view of a stretching head according to an embodiment of the present utility model;
fig. 3 is a schematic view of a platen structure according to an embodiment of the present utility model.
In the figure: 1. a transmission shaft; 2. a spiral sleeve; 3. clamping a nut; 4. a stretching head; 5. a hydraulic stretcher; 6. a quick-change joint; 7. a support ring; 8. a support sleeve; 8-1, adjusting the notch; 9. a pressing plate; 9-1, annular clamping grooves; 10. and (5) compressing the nut.
Detailed Description
The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1 to 3, the application provides a screw pump spiral sleeve pretension device, including support sleeve 8, transmission shaft 1 runs through along axial level support sleeve 8, arranges in be provided with spiral sleeve 2 on the transmission shaft 1 in the support sleeve 8, all be provided with the clamping nut 3 that is used for pretension spiral sleeve 2 on the transmission shaft 1 at spiral sleeve 2 both ends, for be provided with on the support sleeve 8 of clamping nut 3 and be used for adjusting clamping nut 3's regulation notch 8-1, conveniently operate the instrument and stretch into in the support sleeve 8 and adjust clamping nut 3 through adjusting notch 8-1.
One end of the support sleeve 8 is provided with a pressing plate 9 sleeved on the transmission shaft 1, the pressing plate 9 is abutted against the support sleeve 8, and an annular clamping groove 9-1 for clamping the support sleeve 8 is formed in the end face of the pressing plate 9 abutted against the support sleeve 8. The support sleeve 8 and the pressing plate 9 can be abutted more stably, the connection reliability in the stretching process is ensured, and the damage to equipment and components caused by the separation of the support sleeve 8 and the pressing plate 9 in the stretching process is avoided. A gland nut 10 for limiting the position of the pressing plate 9 is arranged on the transmission shaft 1 outside the pressing plate 9; the support sleeve 8 is provided with a stretching head 4 which is in threaded connection with the transmission shaft 1 relative to the other end of the pressing plate 9, the stretching head 4 is provided with a hydraulic stretcher 5, the piston end face of the hydraulic stretcher 5 is in butt joint with the stretching head 4, the stretching head 4 comprises a stress part 4-1 and a mounting part 4-2, a horizontally through threaded through hole 4-3 is formed in the stretching head 4, the stretching head 4 is in threaded connection with the transmission shaft 1 through the threaded through hole 4-3, the diameter of the stress part 4-1 is larger than that of the mounting part 4-2, a stepped shaft structure is formed, the hydraulic stretcher 5 is mounted on the mounting part 4-2, and the piston end face of the hydraulic stretcher 5 is in butt joint with the stress face of the stress part 4-1, namely, the plane where the stepped shaft shoulder is located. The cylinder end face of the hydraulic stretcher 5 is mutually abutted with a support sleeve 8 through a support ring 7, and the hydraulic stretcher 5 is connected with an external hydraulic pump through a quick-change connector 6.
When in use, the screw sleeve 2 is arranged on the transmission shaft 1, and the clamping nuts 3 are respectively sleeved on the transmission shaft 1 at the two ends of the screw sleeve 2. The transmission shaft 1 and the spiral sleeve 2 are arranged in the support sleeve 8, the pressing plate 9 is abutted against the support sleeve 8 through the annular clamping groove 9-1, and the compression nut 10 is screwed, so that the position of the pressing plate 9 is ensured to be relatively fixed; the hydraulic stretcher 5 is arranged on the stretching head 4, the stretching head 4 is connected to the transmission shaft 1 in a threaded mode, the end face of a cylinder body of the hydraulic stretcher 5 is abutted to the supporting sleeve 8 through the supporting ring 7, and the pre-tightening device is assembled. High-pressure oil output by the hydraulic pump is conveyed into the hydraulic stretcher 5 through the quick-change connector 6, and under the action of pressure, the piston of the hydraulic stretcher 5 moves in the direction away from the spiral sleeve 2 and pushes the stretching head 4, so that the transmission shaft 1 is prolonged; under the action of the reaction force, the end face of the cylinder body of the hydraulic stretcher 5 pushes the supporting ring 7, the supporting sleeve 8 and the pressing plate 9 to be tightly abutted and relatively fixed. According to the functional relation of the pretightening moment and the output pressure of the hydraulic pump, the clamping nut 3 is locked when the pretightening moment reaches the technical requirement. Unloading the pressure of the hydraulic pump, and disassembling the pre-tightening device: the stretching head 4 and the hydraulic stretcher 5 are removed from the transmission shaft 1, the supporting ring 7 and the supporting sleeve 8 which are sequentially abutted are taken out, the compression nut 10 is unscrewed, the compression nut 10 is removed from the transmission shaft 1, and the pressing plate 9 is taken out.
The calculation process of the functional relation between the pretightening moment and the hydraulic pump output pressure is as follows:
calculating pretightening force P0
P0＝σ0·As (1)
As＝Π·ds·ds/4 (2)
ds＝(d2+d1-H/6)/2 (3)
σ0＝(0.5～0.7)σs (4)
Wherein: sigma is the yield limit of the material in N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the H is the nominal working height of the thread teeth, and the unit is mm; d1 is the minor diameter of the thread, and the unit is mm; d2 is the minor diameter of the thread, and the unit is mm; ds is the calculated diameter of the dangerous section of the threaded portion in mm; as is the nominal stress cross-sectional area in mm 2 。
Calculation of the pretightening moment Mt=K.P0.d/1000 N.m (5)
Wherein K is a tightening coefficient; d is the nominal diameter of the thread in mm.
K value lookup table:
relationship between high-pressure oil pressure and stretching force in the hydraulic stretcher 5:
P1＝F1/A1 (6)
P2＝P1 (7)
wherein: p1 is the pressure of high-pressure oil in the hydraulic stretcher 5, and the unit is MPa; f1 is the thread tension of the stretching head 4 and the unit is KN; a1 is the hydraulic area in mm in the hydraulic stretcher 5 2 The method comprises the steps of carrying out a first treatment on the surface of the P2 is the hydraulic pump output pressure in MPa.
Relationship between hydraulic pump output pressure and pretightening moment:
when the thread tension F1 of the tension head 4 reaches the pretightening force P0 and the transmission shaft 1 is elastically deformed, it can be seen from the above formulas (1) to (7):
Mt＝K·P2·A1·d/1000 (8)
P2≤(0.5～0.7) σs·(d2+d1-H/6)2·Π/16 (9)
as can be seen from the formula (8), the pretightening moment Mt is in a direct proportion to the tightening coefficient K, the hydraulic pump output pressure P2, the hydraulic area A1 in the hydraulic stretcher 5, and the nominal diameter d of the screw thread, and when the hydraulic stretcher 5 determines, the hydraulic area A1 in the hydraulic stretcher 5 and the nominal diameter d of the screw thread are constant, that is, the formula (8) can be changed to:
Mt＝C·K·P2 (10)
wherein: c is a constant;
as is clear from the equation (10), when the tightening coefficient K is determined, and the transmission shaft 1 is elastically deformed, the pretightening moment Mt and the hydraulic pump output pressure P2 are in a linear relationship.
By adopting the technical scheme, the hydraulic source provided by the hydraulic pump is used for determining the tensile force according to the tensile strength, the yield coefficient and the elongation of the material, and the transmission shaft 1 with the applied force is elongated in the elastic deformation area by using the tensile force generated by the hydraulic pump, so that the diameter of the transmission shaft 1 is slightly deformed, and the clamping nut 3 is used for locking the spiral sleeve 2. The transmission shaft 1 is lengthened by pure tension, friction damage is avoided to the connected contact surface, and the pretightening moment of the spiral sleeve 2 can be accurately controlled; only axial tensile loads are generated, no destructive torsional loads are brought about, damage to the clamping nut 3 and the drive shaft 1 is avoided, and a high quality assembly is obtained.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (4)
1. The screw pump screw sleeve pre-tightening device is characterized by comprising a support sleeve (8), wherein a transmission shaft (1) horizontally penetrates through the support sleeve (8) along the axial direction, a screw sleeve (2) is arranged on the transmission shaft (1) arranged in the support sleeve (8), and clamping nuts (3) for pre-tightening the screw sleeve (2) are arranged on the transmission shafts (1) at two ends of the screw sleeve (2);
one end of the supporting sleeve (8) is provided with a pressing plate (9) sleeved on the transmission shaft (1), the pressing plate (9) is abutted against the supporting sleeve (8), and the transmission shaft (1) at the outer side of the pressing plate (9) is provided with a compression nut (10) for limiting the position of the pressing plate (9); the hydraulic stretching device is characterized in that a stretching head (4) which is in threaded connection with a transmission shaft (1) is arranged at the other end of the supporting sleeve (8) opposite to the pressing plate (9), a hydraulic stretcher (5) is arranged on the stretching head (4), the end face of a piston of the hydraulic stretcher (5) is abutted against the stretching head (4), the end face of a cylinder body of the hydraulic stretcher (5) is abutted against the supporting sleeve (8) through a supporting ring (7), and the hydraulic stretcher (5) is connected with an external hydraulic pump through a quick-change connector (6).
2. Screw pump screw sleeve pretensioning device according to claim 1, characterized in that an adjustment notch (8-1) for adjusting the clamping nut (3) is provided on the support sleeve (8) relative to the clamping nut (3).
3. Screw pump screw sleeve pretensioning device according to claim 1 or 2, characterized in that an annular clamping groove (9-1) for clamping the support sleeve (8) is provided on the end face of the pressure plate (9) abutting against the support sleeve (8).
4. Screw pump screw sleeve pre-tightening device according to claim 1, characterized in that the stretching head (4) comprises a stress part (4-1) and a mounting part (4-2), a horizontally through threaded through hole (4-3) is arranged in the stretching head (4), the diameter of the stress part (4-1) is larger than that of the mounting part (4-2), the hydraulic stretcher (5) is mounted on the mounting part (4-2), and the piston end face of the hydraulic stretcher (5) is abutted on the stress face of the stress part (4-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321026969.7U CN220372607U (en) | 2023-04-28 | 2023-04-28 | Screw pump spiral sleeve pre-tightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321026969.7U CN220372607U (en) | 2023-04-28 | 2023-04-28 | Screw pump spiral sleeve pre-tightening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220372607U true CN220372607U (en) | 2024-01-23 |
Family
ID=89572992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321026969.7U Active CN220372607U (en) | 2023-04-28 | 2023-04-28 | Screw pump spiral sleeve pre-tightening device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220372607U (en) |
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2023
- 2023-04-28 CN CN202321026969.7U patent/CN220372607U/en active Active
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