CN212376873U - Composite variable-pitch screw - Google Patents
Composite variable-pitch screw Download PDFInfo
- Publication number
- CN212376873U CN212376873U CN202020703326.1U CN202020703326U CN212376873U CN 212376873 U CN212376873 U CN 212376873U CN 202020703326 U CN202020703326 U CN 202020703326U CN 212376873 U CN212376873 U CN 212376873U
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- threads
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- screw
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- threaded part
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- 239000002131 composite material Substances 0.000 title description 4
- 239000011295 pitch Substances 0.000 claims abstract description 48
- 150000001875 compounds Chemical class 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
The utility model discloses a compound variable pitch screw rod, a serial communication port, include: the screw rod body is provided with a first connecting end and a second connecting end at two ends, and the first connecting end is radially provided with a groove; the end of the constant-pitch threaded part is connected with the starting end of the variable-pitch threaded part, the constant-pitch threaded part comprises first to fourth threads which are connected end to end, and the pitches of the first to fourth threads are equal; the variable-pitch threaded part comprises fifth threads and sixth threads which are connected end to end, and the pitch between the fifth threads and the sixth threads is larger than the pitch between the first threads and the fourth threads. The utility model provides a compound variable pitch screw rod can reach the purpose of improving exhaust efficiency and vacuum performance, and energy-conserving effect is obvious.
Description
Technical Field
The utility model relates to the field of machine-building, concretely relates to compound variable pitch screw rod.
Background
In the use of vacuum pumps and other vacuum equipment, the design of the screw is a key component for improving the exhaust energy efficiency and the vacuum performance and improving the energy-saving effect.
The existing screw design cannot meet the performance requirements of new vacuum pumps and other vacuum equipment.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned defects of the prior art, the present invention provides a composite variable pitch screw.
In order to realize the utility model discloses an aim, the technical scheme who adopts is:
a compound variable pitch screw comprising:
the screw rod body is provided with a first connecting end and a second connecting end at two ends, and the first connecting end is radially provided with a groove; the end of the constant-pitch threaded part is connected with the starting end of the variable-pitch threaded part, the constant-pitch threaded part comprises first to fourth threads which are connected end to end, and the pitches of the first to fourth threads are equal;
the variable-pitch threaded part comprises fifth threads and sixth threads which are connected end to end, and the pitch between the fifth threads and the sixth threads is larger than the pitch between the first threads and the fourth threads.
In a preferred embodiment of the present invention, the first connecting end is fixed to one end of the screw body through the table end.
In a preferred embodiment of the present invention, the second connecting end is installed at the other end of the screw body, the second connecting end includes a first sub-connecting end and a second sub-connecting end connected to the screw body, and the diameter of the first sub-connecting end is greater than that of the second sub-connecting end.
In the utility model discloses a preferred embodiment, the middle part of screw rod body is equipped with screw thread installation pole, equal pitch screw thread portion and variable pitch screw thread portion axle are established the periphery of screw thread installation pole, the diameter of screw thread installation pole is greater than the diameter of first, second link.
The beneficial effects of the utility model reside in that:
the utility model provides a compound variable pitch screw rod can reach the purpose of improving exhaust efficiency and vacuum performance, and energy-conserving effect is obvious.
Drawings
Fig. 1 is a schematic structural view (front view) of the present invention.
Fig. 2 is a schematic structural view (rear view) of the present invention.
Fig. 3 is a schematic structural diagram (left side view) of the present invention.
Fig. 4 is a schematic structural view (right side view) of the present invention.
Fig. 5 is a schematic structural view (top view) of the present invention.
Fig. 6 is a schematic structural diagram (bottom view) of the present invention.
Fig. 7 is a schematic structural view (perspective view) of the present invention.
Detailed Description
The composite variable pitch screw 100 shown in fig. 1-7 comprises a screw body 110, and connecting ends 120 and 130 are provided at two ends 111 and 112 of the screw body 110.
Specifically, a connecting end 120 is fixed to one end 111 of the screw body 110 through a table end 113, and a groove 121 is radially formed in the connecting end 120.
The other end 112 of the screw body 110 is provided with a connecting end 130, the connecting end 130 comprises sub connecting ends 131 and 132 connected with the screw body 110, and the diameter of the sub connecting end 131 is larger than that of the sub connecting end 132.
The constant pitch thread part 140 and the variable pitch thread part 150 are provided in an axial direction from the connection end 111 to the connection end 112, and particularly, a screw installation rod 160 is provided at a middle portion of the screw body 110, the constant pitch thread part 140 and the variable pitch thread part 150 are axially provided at an outer periphery 161 of the screw installation rod 160, and a diameter of the screw installation rod 160 is larger than diameters of the connection ends 111 and 112.
The end 141 of the constant pitch thread part 140 is connected to the start 151 of the variable pitch thread part 150, and the constant pitch thread part 140 includes end-to- end threads 142, 143, 144, 145, and the pitches of the threads 142, 143, 144, 145 are equal.
The variable pitch thread 150 includes end-to- end threads 152, 153, with the pitch between the threads 152, 153 being greater than the pitch between the threads 142, 143, 144, 145.
Claims (4)
1. A compound variable pitch screw, comprising:
the screw rod body is provided with a first connecting end and a second connecting end at two ends, and the first connecting end is radially provided with a groove; the end of the constant-pitch threaded part is connected with the starting end of the variable-pitch threaded part, the constant-pitch threaded part comprises first to fourth threads which are connected end to end, and the pitches of the first to fourth threads are equal;
the variable-pitch threaded part comprises fifth threads and sixth threads which are connected end to end, and the pitch between the fifth threads and the sixth threads is larger than the pitch between the first threads and the fourth threads.
2. A compound variable pitch screw as defined in claim 1, wherein a first connection end is secured to one end of said screw body by a table end.
3. A compound variable pitch screw according to claim 1, wherein a second connection end is mounted to the other end of said screw body, said second connection end comprising a first sub-connection end and a second sub-connection end connected to said screw body, said first sub-connection end having a larger diameter than said second sub-connection end.
4. A compound variable pitch screw according to claim 1, wherein a threaded mounting rod is provided in the middle of the screw body, the constant pitch thread portion and the variable pitch thread portion are axially provided on the outer periphery of the threaded mounting rod, and the diameter of the threaded mounting rod is larger than the diameters of the first and second connecting ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020703326.1U CN212376873U (en) | 2020-04-30 | 2020-04-30 | Composite variable-pitch screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020703326.1U CN212376873U (en) | 2020-04-30 | 2020-04-30 | Composite variable-pitch screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212376873U true CN212376873U (en) | 2021-01-19 |
Family
ID=74162257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020703326.1U Active CN212376873U (en) | 2020-04-30 | 2020-04-30 | Composite variable-pitch screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212376873U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466132A (en) * | 2021-07-01 | 2021-10-01 | 哈尔滨金融学院 | Hyperspectrum-based rice blast cycle detection equipment |
-
2020
- 2020-04-30 CN CN202020703326.1U patent/CN212376873U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466132A (en) * | 2021-07-01 | 2021-10-01 | 哈尔滨金融学院 | Hyperspectrum-based rice blast cycle detection equipment |
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