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Screw of screw vacuum pump

Technology of a screw vacuum pump, screw, applied in the direction of pumps, parts of pumping devices for elastic fluids, pump elements

Active Publication Date: 2016-06-15
巫修海 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention proposes a screw of a screw vacuum pump. The technical problem to be solved by the invention is how to improve the ultimate vacuum degree of the screw vacuum pump and ensure the operation safety of the vacuum pump without the problem of greatly increasing the manufacturing cost

Method used

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  • Screw of screw vacuum pump
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  • Screw of screw vacuum pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the screw of the screw vacuum pump includes a cylindrical rod body 1, a spiral groove 2 is opened on the outer surface of the rod body 1, and the two ports of the spiral groove 2 are respectively located on both ends of the rod body 1. One end of the rod body 1 is The suction part 3, the other end is the exhaust part 4, and the compression transition part 5 is between the suction part 3 and the exhaust part 4; the pitch of the spiral groove 2 on the suction part 3 is constant, and the helical The pitch of the groove 2 is constant, the pitch of the spiral groove 2 on the exhaust part 4 is smaller than the pitch of the spiral groove 2 on the suction part 3; one end of the spiral groove 2 on the compression transition part 5 is connected with the spiral groove 2 on the suction part 3, The other end is in contact with the helical groove 2 on the exhaust part 4, and the pitch of the helical groove 2 on the compression transition part 5 gradually de...

Embodiment 2

[0042] The structure and principle of this embodiment are basically the same as that of Embodiment 1, except that the number of winding turns of the spiral groove 2 is 4 turns, and the number of turns of the spiral groove 2 on the suction part 3 is 1 turn; the compression transition part 5 The number of turns of the upper spiral groove 2 is 1.25 turns, and the number of turns of the upper spiral groove 2 of the exhaust part 4 is 1.75 turns.

[0043] The vacuum pump using the variable-pitch screw reduces the ultimate vacuum degree by increasing the number of turns of the helical groove 2 on the compression transition part 5; at the same time, the length of the screw running heat is increased, the temperature of the screw and the internal working temperature of the vacuum pump are reduced, and the deformation of the screw is reduced. The machining accuracy and manufacturing cost of the screw are reduced, and the performance stability of the vacuum pump can be ensured.

[0044]Th...

Embodiment 3

[0051] The structure and principle of this embodiment are basically the same as that of Embodiment 1, except that the number of winding turns of the spiral groove 2 is 5.5 turns, and the number of turns of the spiral groove 2 on the suction part 3 is 1 turn; the compression transition part 5 The number of turns of the upper spiral groove 2 is 1 turn, and the number of turns of the upper spiral groove 2 of the exhaust part 4 is 3.5 turns.

[0052] The vacuum pump using the variable pitch screw reduces the ultimate vacuum degree by increasing the number of turns of the helical groove 2 on the exhaust part 4; at the same time, it increases the heating length of the screw, reduces the temperature of the screw and the internal working temperature of the vacuum pump, and then reduces the deformation of the screw, thus The machining accuracy and manufacturing cost of the screw are reduced, and the performance stability of the vacuum pump can be ensured.

[0053] The nonlinear change ...

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Abstract

The invention provides a screw of a screw vacuum pump, and belongs to the technical field of vacuum pumps. The problem that an existing screw of the screw vacuum pump can not meet specific technological conditions is solved. The number of circles of a spiral groove in an air intake part in the screw of the screw vacuum pump is 0.75-1.25. When the number of circles of a spiral groove in a compression transition part is 1, the number of circles of a spiral groove in an exhausting part is larger than 3. When the number of circles of the spiral groove in the compression transition part is larger than 1, the number of circles of the spiral groove in the exhausting part is 1.75-4. By means of the screw of the screw vacuum pump, the final vacuum degree of the vacuum pump is higher, the performance is more stable, the manufacturing cost is hardly increased, the screw vacuum pumps have more models, and the application range is wider. According to the screw vacuum pump adopting the variable-pitch screw, by properly increasing the number of winding circles of the spiral grooves, the compression capacity is optimized, the exhausting efficiency of the exhausting part is improved, the phenomenon that air of the exhausting part can not be exhausted and compression is excessive is relieved, and the unit energy consumption is further effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of vacuum pumps, and relates to a screw vacuum pump, in particular to a screw of the screw vacuum pump. Background technique [0002] Screw vacuum pumps have the advantages of long maintenance period and convenience, environmental protection, high reliability, high efficiency and easy control. Therefore, in many processes, screw vacuum pumps have become an inevitable trend to replace water ring vacuum pumps, slide valve vacuum pumps, and other wet vacuum pumps. [0003] The applicant once proposed a screw of a screw vacuum pump, which was recorded in the Chinese patent literature (application publication number: CN102937094A). Compared with the previous vacuum pump, the vacuum pump using this screw provided energy demand, noise, internal working temperature, and structural space. As well as the best choice for manufacturing costs, it also has the advantage of a wider range of applications. [0004] In some ...

Claims

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Application Information

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IPC IPC(8): F04C29/00F04C18/16F04C18/107
CPCF04C18/082F04C18/107F04C18/16F04C2220/10F04C2240/20F04C2250/20
Inventor 巫修海马云芳
Owner 巫修海
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