CN116608125A - Variable-section variable-lead vacuum pump - Google Patents

Variable-section variable-lead vacuum pump Download PDF

Info

Publication number
CN116608125A
CN116608125A CN202310611861.2A CN202310611861A CN116608125A CN 116608125 A CN116608125 A CN 116608125A CN 202310611861 A CN202310611861 A CN 202310611861A CN 116608125 A CN116608125 A CN 116608125A
Authority
CN
China
Prior art keywords
section
screw
tooth
variable
helical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310611861.2A
Other languages
Chinese (zh)
Inventor
刘永胜
许祖近
王波
许鹏烨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Kelexi Power Equipment Co ltd
Original Assignee
Zhejiang Kelexi Power Equipment Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Kelexi Power Equipment Co ltd filed Critical Zhejiang Kelexi Power Equipment Co ltd
Priority to CN202310611861.2A priority Critical patent/CN116608125A/en
Publication of CN116608125A publication Critical patent/CN116608125A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2250/00—Geometry
    • F04C2250/20—Geometry of the rotor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The application relates to a variable-section variable-lead vacuum pump which comprises a screw rod, wherein the screw rod comprises a stud, a front screw section and a rear screw section, the front screw section comprises a plurality of screw teeth, the rear screw section comprises a screw tooth, the screw tooth is fixedly connected to the outer wall of the stud, and the tooth width of the screw tooth of the front screw section is larger than the minimum tooth width of the screw tooth of the rear screw section. The tooth width of the rear spiral tooth is increased, the sealing effect between the screw and the inner wall of the pump body is improved due to the wider tooth top seal, the compression ratio of the screw vacuum pump is improved, the probability of gas and dust backflow is effectively reduced due to the widened tooth width of the spiral tooth, the air extraction efficiency is improved, and the energy consumption is reduced.

Description

Variable-section variable-lead vacuum pump
Technical Field
The application relates to the field of vacuum pumps, in particular to a variable-section variable-lead vacuum pump.
Background
The screw vacuum pump is an air extracting device which uses a pair of screws to perform synchronous high-speed reverse rotation in a pump shell to generate air suction and air exhaust effects, is a newer product of an oil seal vacuum pump, can extract gas containing a large amount of water vapor and a small amount of dust, and is widely applied to the fields of enterprises with high requirements on cleaning vacuum, such as domestic pharmacy, chemical industry, semiconductors and the like.
The two screws are supported by bearings and are arranged in the pump shell after fine dynamic balance treatment, and a certain gap is reserved between the screws, so that the pump operates stably without friction, and a working cavity does not need working medium.
In the cone design process of the screw vacuum pump, a method for changing the screw pitch is mostly adopted in China. The application patent with the publication number of CN114718867A discloses a screw vacuum pump, which comprises a cylindrical variable-pitch screw, wherein the outer side surface of the variable-pitch screw is provided with a spiral groove, and the spiral groove from one end of the variable-pitch screw to the other end is respectively called a first spiral section, a second spiral section, a third spiral section, a fourth spiral section and a fifth spiral section; the number of spiral turns of the first spiral section and the fifth spiral section is 0.9-1.1, and the number of spiral turns of the second spiral section, the third spiral section and the fourth spiral section is 1; the pitch of the second helical segment is longest, and the pitches of the second helical segment and the fifth helical segment are sequentially reduced. The volume of the invalid sealing ring is reduced, the volume of the effective sealing ring is increased, and then the air extraction rate in the middle-high pressure working stage is improved and the energy consumption is reduced by reducing the screw pitch of the first screw section and increasing the screw pitch of the second screw section.
However, as the pitch decreases, the tip of the screw becomes thinner, and the gas tends to flow back from the narrowed tip.
Disclosure of Invention
In order to reduce the probability of gas reflux, the application provides a screw vacuum pump.
The application provides a screw vacuum pump which adopts the following technical scheme:
the utility model provides a screw vacuum pump, includes the screw rod, the screw rod includes double-screw bolt, preceding screw section and back screw section, preceding screw section includes a plurality of helical teeth, back screw section includes a helical tooth, helical tooth fixed connection is in the outer wall of double-screw bolt, the minimum tooth width of the helical tooth of preceding screw section's helical tooth is greater than the helical tooth of back screw section.
Through adopting above-mentioned technical scheme, increase the tooth width of back helical tooth, the sealed effect that improves between screw rod and the pump body inner wall of wider top, improve the compression ratio of screw rod vacuum pump, the helical tooth width of widening has effectively reduced the probability that gas and dust returned, has improved pumping efficiency, has reduced the energy consumption.
Preferably, adjacent spiral teeth and the stud form a spiral groove, the bottom of the spiral groove is the outer wall of the stud, the wall of the spiral groove is the tooth surface of the spiral teeth, the two screws are divided into a first screw and a second screw, and the spiral teeth of the first screw are embedded in the spiral groove of the second screw.
By adopting the technical scheme, the spiral teeth are embedded in the spiral grooves, the double screws improve the air extraction rate of the air, and the working efficiency of the vacuum pump is improved.
Preferably, a part of the tooth surface of the spiral tooth, which is close to the axis of the stud, is a spiral concave surface, a part of the tooth surface of the spiral tooth, which is far away from the axis of the stud, is a spiral convex surface, and the spiral concave surface and the spiral convex surface are in smooth transition.
Through adopting above-mentioned technical scheme, helical tooth spiral convex surface has increased and has revealed the gas resistance, reduces the leakage of gas, and the spiral concave surface makes helical tooth have certain thermal expansion space for screw vacuum pump work is more stable.
Preferably, the variable-section variable-lead vacuum pump further comprises two synchronizing wheels, wherein the two synchronizing wheels are coaxially and fixedly connected to the outer wall of one end of the first screw rod and the outer wall of one end of the second screw rod respectively, and the two synchronizing wheels are meshed with each other.
By adopting the technical scheme, the two screws can be controlled to reversely and synchronously rotate by controlling the rotation of one screw, and the operation is simple and convenient.
Preferably, the lead of the leading helical segment decreases as it approaches the trailing helical segment.
By adopting the technical scheme, the change of the lead controls the internal compression of the gas from the front spiral section to the rear spiral section, optimizes the compression of the gas in the pump body, greatly improves the gas compression rate, reduces the energy consumption, and simultaneously has the advantages of high air extraction rate, small backflow, low specific power and low energy consumption.
Preferably, the stud comprises a column body and a cone body, the cone body is coaxially and fixedly connected to the outer wall of the column body, one end of the cone body is provided with an exhaust end, the other end of the cone body is provided with an air inlet end, the diameter of the exhaust end is larger than that of the air inlet end, the rear spiral section is connected to the exhaust end, and the front spiral section is close to the air inlet end.
Through adopting above-mentioned technical scheme, the medium of inhaling the stage is rectified to the end of inhaling of screw rod major diameter constant diameter, has reduced the noise, has improved the energy efficiency of evacuating, controls from inhaling end to gas compression of gas outlet, improves the vacuum degree of vacuum pump, noise reduction, reduction pump body temperature.
Preferably, the diameter of the exhaust end increases with distance from the intake end.
Through adopting above-mentioned technical scheme, effectively improved the efficiency of breathing in and inside compression ratio, noise reduction and reduction inside operating temperature, more convenient special joining in marriage and processing improve screw rod machining efficiency, improve the effect of gas compression simultaneously.
Preferably, the variable-section variable-lead vacuum pump further comprises a shell, wherein the shell is provided with an installation cavity, one end of the stud is rotationally connected to the inner wall of the installation cavity, and the outer wall of the spiral tooth is attached to the inner wall of the installation cavity.
Through adopting above-mentioned technical scheme, helical tooth outer wall laminating installation intracavity wall has reduced the probability of gas leakage.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the tooth width of the rear spiral teeth is increased, the sealing effect between the screw and the inner wall of the pump body is improved due to the wider tooth top seal, the compression ratio of the screw vacuum pump is improved, the probability of gas and dust backflow is effectively reduced due to the widened tooth width of the spiral teeth, the air extraction efficiency is improved, and the energy consumption is reduced;
2. the spiral convex surface of the spiral tooth increases the leakage gas resistance, reduces the leakage of gas, and the spiral concave surface enables the spiral tooth to have a certain thermal expansion space, so that the screw vacuum pump works more stably;
3. the change of the lead controls the internal compression of the gas from the front spiral section to the rear spiral section, optimizes the compression of the gas in the pump body, greatly improves the gas compression rate, reduces the energy consumption, and has the advantages of high air extraction rate, small reflux, low specific power and low energy consumption.
Drawings
Fig. 1 is a schematic view of the overall structure of a variable-section variable-lead vacuum pump.
Figure 2 is a cross-sectional view of a variable section variable lead vacuum pump.
Figure 3 is a cross-sectional view of a variable section variable lead vacuum pump, primarily for showing the air outlet, air inlet and screw.
Fig. 4 is a schematic view of the overall structure of the screw.
Fig. 5 is a schematic view of the overall structure of the screw, mainly for showing the cylinder and the helical groove.
Reference numerals illustrate: 1. a support base; 2. a housing; 21. a mounting cavity; 211. a rotating groove; 212. a positioning groove; 22. a placement cavity; 23. a driving port; 24. an air outlet; 25. an air inlet; 3. a bearing; 4. a screw; 41. a stud; 411. a column; 412. a vertebral body; 413. an air inlet end; 414. an exhaust end; 421. a front spiral section; 422. a rear spiral section; 423. spiral teeth; 43. a spiral groove; 431. a spiral concave surface; 432. a spiral convex surface; 5. a synchronizing wheel; 6. and driving the motor.
Detailed Description
The application is described in further detail below with reference to fig. 1-5.
The embodiment of the application discloses a variable-section variable-lead vacuum pump. Referring to fig. 1 and 2, the variable-section variable-lead vacuum pump includes a support base 1, a housing 2, a bearing 3, a screw 4, a synchronizing wheel 5, and a driving motor 6.
The upper end fixed connection of supporting seat 1 is in casing 2, the lower extreme fixed connection of supporting seat 1 is in ground, casing 2 is equipped with installation cavity 21, the length direction level of installation cavity 21, the inner wall of installation cavity 21 is equipped with the rotation groove 211, the rotation groove 211 is equipped with four, the axis of four rotation grooves 211 is all parallel to the length direction of installation cavity 21, the both ends of installation cavity 21 are located respectively to four rotation grooves 211, relative rotation groove 211 just sets up, two rotation grooves 211 of locating installation cavity 21 one end are along the width direction interval distribution of installation cavity 21.
Referring to fig. 2, four bearings 3 are provided, the bearings 3 are embedded in the rotating grooves 211 in a one-to-one correspondence, the outer diameter of the bearings 3 is equal to the inner diameter of the rotating grooves 211, the outer wall of the bearings 3 is fixedly connected to the inner wall of the rotating grooves 211, and positioning grooves 212 are coaxially arranged at the bottoms of the rotating grooves 211. One end of the casing 2 is provided with a placing cavity 22, the placing cavity 22 and the mounting cavity 21 are coaxially arranged, the placing cavity 22 is communicated with two positioning grooves 212, the outer wall of one end of the casing 2 is provided with a driving opening 23, the driving opening 23 is communicated with the placing cavity 22, and the driving opening 23 and one positioning groove 212 are coaxially arranged.
Referring to fig. 2 and 3, the screw 4 includes a stud 41, a front screw section 421 and a rear screw section 422, the stud 41 includes a cylinder 411 and a cone 412, the front screw section 421 includes a plurality of screw teeth 423, the rear screw section 422 includes one screw tooth 423, the screw 4 is provided with two screws 41 respectively provided as a first screw 41 and a second screw 41, both ends of the cylinder 411 extend into opposite positioning slots 212, axes of the two cylinders 411 are parallel to axes of the rotating slots 211, a diameter of the cylinder 411 is equal to an inner diameter of the bearing 3 equal to a diameter of the positioning slots 212, an inner wall of the bearing 3 is fixedly connected to an outer wall of the cylinder 411, and the cone 412, the front screw section 421 and the rear screw section 422 are all provided in the mounting cavity 21.
Referring to fig. 2, one end of the column 411 extends into the placement cavity 22, the synchronizing wheels 5 are disposed in the placement cavity 22, the synchronizing wheels 5 are coaxially and fixedly connected to the periphery of the column 411, two synchronizing wheels 5 are disposed, the synchronizing wheels 5 are connected with the column 411 in a one-to-one correspondence manner, and the two synchronizing wheels 5 are meshed with each other. The motor housing 2 of the driving motor 6 is fixedly connected to the outer wall of the housing 2, and the motor shaft of the driving motor 6 passes through the driving opening 23 and is coaxially and fixedly connected to one end of one column 411.
Referring to fig. 2 and 3, the cone 412 is coaxially and fixedly connected to the outer wall of the column 411, one end of the cone 412 close to the placement cavity 22 is set as an air inlet end 413, one end of the cone 412 away from the placement cavity 22 is set as an air outlet end 414, the diameter of the cone 412 increases with distance from the placement cavity 22, and the spiral teeth 423 are fixedly connected to the outer wall of the cone 412.
The upper end of casing 2 is equipped with gas outlet 24, and the lower extreme of casing 2 is equipped with air inlet 25, and air inlet 25 and gas outlet 24 all communicate in installation cavity 21, and air inlet 25 and gas outlet 24 locate the both sides of helical tooth 423, and air inlet 25 is less than the distance of gas outlet 24 to placing cavity 22.
Referring to fig. 2 and 4, the spiral teeth 423 and the cone 412 form a spiral groove 43, the groove bottom of the spiral groove 43 is the outer wall of the cone 412, and the groove wall of the spiral groove 43 is the tooth surface of the spiral teeth 423. The screw teeth 423 of the first screw 4 are embedded in the screw grooves 43 of the second screw 4, and the outer walls of the screw teeth 423 are attached to the inner wall of the mounting cavity 21 and the bottom of the screw grooves 43.
Referring to fig. 4, the distance from the front spiral section 421 to the exhaust end 414 is greater than the distance from the rear spiral section 422 to the exhaust end 414, the lead of the front spiral section 421 decreases as approaching the rear spiral section 422, the lead of the rear spiral section 422 is greater than the minimum lead of the front spiral section 421, and the tooth width of the spiral teeth 423 of the rear spiral section 422 is greater than the minimum tooth width of the spiral teeth 423 of the front spiral section 421.
Referring to fig. 5, a portion of the groove wall of the spiral groove 43 near the axis of the cylinder 411 is referred to as a spiral concave surface 431, and a portion of the groove wall of the spiral groove 43 distant from the axis of the cylinder 411 is referred to as a spiral convex surface 432, and the spiral concave surface 431 and the spiral convex surface 432 smoothly transition.
The implementation principle of the variable-section variable-lead vacuum pump provided by the embodiment of the application is as follows: the driving motor 6 drives the columns 411 to rotate, and the two columns 411 synchronously and reversely rotate through the synchronous wheel 5, the spiral teeth 42 are embedded in the spiral grooves 43, so that the gas is pressurized and conveyed from the gas inlet end 413 to the gas outlet end 414 for discharge.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (8)

1. A variable cross-section variable lead vacuum pump is characterized in that: including screw rod (4), screw rod (4) include double-screw bolt (41), preceding helical segment (421) and back helical segment (422), preceding helical segment (421) include a plurality of helical teeth (423), back helical segment (422) include one helical tooth (423), helical tooth (423) fixed connection is in the outer wall of double-screw bolt (41), the minimum tooth width of helical tooth (423) of preceding helical segment (421) helical tooth (423) is greater than back helical segment (422).
2. The variable cross-section variable lead vacuum pump of claim 1, wherein: adjacent helical teeth (423) and double-screw bolt (41) form helical groove (43), the tank bottom of helical groove (43) is the outer wall of double-screw bolt (41), the cell wall of helical groove (43) is the flank of tooth of helical teeth (423), two screw rods (4) divide into first screw rod (4) and second screw rod (4), helical teeth (423) of first screw rod (4) inlay in helical groove (43) of second screw rod (4).
3. The variable cross-section variable lead vacuum pump of claim 2, wherein: the part of the tooth surface of the spiral tooth (423) close to the axis of the stud (41) is a spiral concave surface (431), the part of the tooth surface of the spiral tooth (423) far away from the axis of the stud (41) is a spiral convex surface (432), and the spiral concave surface (431) and the spiral convex surface (432) are in smooth transition.
4. The variable cross-section variable lead vacuum pump of claim 2, wherein: the variable-section variable-lead vacuum pump further comprises two synchronizing wheels (5), wherein the two synchronizing wheels (5) are respectively and coaxially fixedly connected with the outer wall of one end of the first screw rod (4) and the outer wall of one end of the second screw rod (4), and the two synchronizing wheels (5) are meshed with each other.
5. The variable cross-section variable lead vacuum pump of claim 1, wherein: the lead of the front helical section (421) decreases as it approaches the rear helical section (422).
6. The variable cross-section variable lead vacuum pump of claim 1, wherein: the screw bolt (41) comprises a column body (411) and a cone body (412), the cone body (412) is coaxially and fixedly connected to the outer wall of the column body (411), one end of the cone body (412) is provided with an exhaust end (414), the other end of the cone body (412) is provided with an air inlet end (413), the diameter of the exhaust end (414) is larger than that of the air inlet end (413), the rear spiral section (422) is connected to the exhaust end (414), and the front spiral section (421) is close to the air inlet end (413).
7. The variable cross-section variable lead vacuum pump of claim 6, wherein: the diameter of the exhaust end (414) increases with distance from the intake end (413).
8. The variable cross-section variable lead vacuum pump of claim 1, wherein: the variable-section variable-lead vacuum pump further comprises a casing (2), wherein the casing (2) is provided with a mounting cavity (21), one end of the stud (41) is rotationally connected to the inner wall of the mounting cavity (21), and the outer wall of the spiral tooth (423) is attached to the inner wall of the mounting cavity (21).
CN202310611861.2A 2023-05-26 2023-05-26 Variable-section variable-lead vacuum pump Pending CN116608125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310611861.2A CN116608125A (en) 2023-05-26 2023-05-26 Variable-section variable-lead vacuum pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310611861.2A CN116608125A (en) 2023-05-26 2023-05-26 Variable-section variable-lead vacuum pump

Publications (1)

Publication Number Publication Date
CN116608125A true CN116608125A (en) 2023-08-18

Family

ID=87676209

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310611861.2A Pending CN116608125A (en) 2023-05-26 2023-05-26 Variable-section variable-lead vacuum pump

Country Status (1)

Country Link
CN (1) CN116608125A (en)

Similar Documents

Publication Publication Date Title
CN101603530B (en) Scroll gas-liquid multiphase mixing transmission pump
CN100590317C (en) Single stage turbine vacuum pumping machine and method for pumping vacuum by the machine
CN219654884U (en) Variable-section variable-lead vacuum pump
CN202673609U (en) Reciprocating air compressor
JP4388167B2 (en) Improvement of vacuum pump
CN116608125A (en) Variable-section variable-lead vacuum pump
JP2001304161A (en) Improved vacuum pump
CN208203554U (en) A kind of low pressure and mass flow compact Quimby pump
CN101608619B (en) Spiral anti-clawed vacuum pump
CN207686980U (en) A kind of varying pitch alloy screw rotor
CN112761959B (en) Multistage centrifugal booster pump
CN113153746A (en) Built-in exhaust supercharger type composite screw vacuum pump
CN204805099U (en) Bulb formula helical blade through -flow pump
CN209687806U (en) A kind of oil-free centrifugal air compressor of hydrogen fuel cell
CN113217389A (en) Water vapor screw compressor suitable for medium-high pressure working condition
CN112610474A (en) Conical rotor double-screw pump with bilateral exhaust
CN207647774U (en) A kind of Roots's blade vacuum pump set being provided with cooling-water machine and condenser
CN210769302U (en) Energy-saving screw dry vacuum pump
CN216714708U (en) Built-in exhaust supercharger type composite screw vacuum pump
CN116517828B (en) Phase-angle-variable multistage Roots vacuum pump and working method thereof
CN219388156U (en) Roots type hydrogen circulating pump
CN2148200Y (en) Synchronous liquid ring pump
CN213574623U (en) Cooling device with built-in cooling coil of Roots pump
CN209244836U (en) Vortex motor compressor vortex
CN200958477Y (en) Oil-free vortex vacuum pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination