CN210977867U - Screw assembly of dry screw vacuum pump - Google Patents
Screw assembly of dry screw vacuum pump Download PDFInfo
- Publication number
- CN210977867U CN210977867U CN201921956685.1U CN201921956685U CN210977867U CN 210977867 U CN210977867 U CN 210977867U CN 201921956685 U CN201921956685 U CN 201921956685U CN 210977867 U CN210977867 U CN 210977867U
- Authority
- CN
- China
- Prior art keywords
- screw
- screw rod
- vacuum pump
- driven
- dry
- 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.)
- Active
Links
Images
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The utility model provides a dry-type screw vacuum pump's screw rod subassembly, revolve to opposite initiative screw rod and driven screw rod including the screw thread, initiative screw rod and driven screw rod all include the linkage segment of screw thread section and screw thread section both sides, be equipped with locating component on the linkage segment, locating component is used for making initiative screw rod and driven screw rod relative positioning. The utility model discloses setting up locating component and being used for making initiative screw rod and driven screw rod relative positioning (axial positioning), avoiding current dry-type screw vacuum pump operating time overlength, the skew can take place for the relative position of initiative screw rod and driven screw rod, influences the meshing transmission of initiative screw rod and driven screw rod, causes the phenomenon that the card pauses to appear between the screw rod, reduces the functioning speed of screw rod, influences the work efficiency of dry-type screw vacuum pump.
Description
Technical Field
The utility model relates to the technical field of pumps, in particular to dry-type screw vacuum pump's screw rod subassembly.
Background
The screw type vacuum pump is an ideal dry pump appearing in 90 years of the 20 th century, has a wide application prospect and a great development potential, and plays an important role in the vacuum pump market. The dry screw vacuum pump generates suction and exhaust actions by a pair of screws rotating in a pump housing in a synchronous high-speed reverse direction. Its advantages are compact structure, long service life, high dynamic balance, no need of lubrication and high pumping speed. The vacuum pump is mainly applied to a high-purity vacuum process, has extremely high vacuum degree, can adapt to severe working conditions, has the capability of extracting coagulability and particulate matter-containing gas, and is a development direction of a future vacuum pump due to the fact that the existing vacuum pumps in the market are various at present and oil-free dry vacuum pumps are pollution-free, energy-saving and environment-friendly. The screw vacuum pump has no friction and reasonable structure, and the gear, the bearing and the shaft seal are lubricated by oil in an oil tank, so that the pump has an ultra-long service life, belongs to an ideal vacuum pump, and is particularly suitable for the fields of electronics, chemical engineering, medicines and the like. The screw assembly of the existing dry screw vacuum pump is arranged in the pump body of the vacuum pump in a mode that the thread sections of the driving screw and the driven screw are mutually meshed, when the dry screw vacuum pump works for a long time, the relative positions of the driving screw and the driven screw can deviate, the meshing transmission of the driving screw and the driven screw is influenced, and therefore the working efficiency of the dry screw vacuum pump is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dry-type screw vacuum pump's screw rod subassembly for the screw rod subassembly that solves current dry-type screw vacuum pump adopts the mode of initiative screw rod and driven screw rod's screw thread section intermeshing to install in the pump body of vacuum pump, and when long-time during operation, the skew can take place for the relative position of initiative screw rod and driven screw rod, influences the meshing transmission of initiative screw rod and driven screw rod, thereby influences the defect of the work efficiency of dry-type screw vacuum pump.
The screw assembly of the dry screw vacuum pump comprises a driving screw and a driven screw, wherein the screw threads are oppositely screwed, the driving screw and the driven screw respectively comprise a thread section and connecting sections on two sides of the thread section, a positioning assembly is arranged on each connecting section, and the positioning assemblies are used for enabling the driving screw and the driven screw to be relatively positioned.
Preferably, the thread section end face molded lines of the driving screw and the driven screw are the same;
the molded lines comprise addendum circular arcs, connecting cycloid, tooth root circular arcs, connecting straight lines and enveloping curves which are connected in sequence, the tangent line of the tooth root circular arc at the joint of the connecting straight line and the tooth root circular arc is collinear with the connecting straight lines, the enveloping curves are in smooth transition between the addendum circular arcs, and the enveloping curves of the driving screw and the driven screw are conjugated.
Preferably, the curvature of the envelope curve decreases from an end connected to the connecting straight line to an end connected to the addendum arc.
Preferably, the positioning assembly comprises: and the driving screw rod and the driven screw rod are respectively provided with a positioning sleeve which is matched with each other.
Preferably, the positioning assembly comprises:
the expansion coupling sleeve is sleeved at the connecting section;
and the connecting pressing sleeve is sleeved on the outer wall of the expansion coupling sleeve, and the outer wall of the connecting pressing sleeve is sleeved with a helical gear.
Preferably, the positioning assembly further comprises:
the center of the fixing plate is provided with a through hole which is fixedly sleeved on the connecting section, and the fixing plate is positioned on one side of the expansion coupling sleeve;
the upper part of the fixing plate and the upper part of the bevel gear are correspondingly provided with threaded through holes, the lower part of the fixing plate and the lower part of the bevel gear are also correspondingly provided with threaded holes, and the fixing plate is connected with the gear through the corresponding threaded holes by using bolts.
Preferably, a cooling flow channel along the axial direction of the driven screw is arranged at the axis of the driven screw.
Preferably, the pump shell of the vacuum pump comprises an inner layer pump shell and an outer layer pump shell connected outside the inner layer pump shell, a cooling cavity is arranged between the inner layer pump shell and the outer layer pump shell, and the upper end and the lower end of the cooling cavity are respectively connected with the water inlet end of the water-cooled cooler through a first water pipe and a second water pipe;
the screw assembly further comprises: the first mounting cover and the second mounting cover are respectively arranged at two ends of the driven screw rod;
a first flow channel is arranged in the first mounting cover, one end of the first flow channel is communicated with the cooling cavity, the first flow channel is communicated with one end of the cooling flow channel, one end of the driven screw is rotatably connected with the first mounting cover, and one end of the first mounting cover is hermetically connected with one end of the driven screw;
and a second flow channel is arranged in the second mounting cover, one end of the second flow channel is connected with the water return end of the water-cooled cooler through a sixth water pipe, the other end of the second flow channel is communicated with the cooling flow channel, and the other end of the driven screw rod is rotatably connected with the second mounting cover.
Preferably, the surfaces of the driving screw and the driving screw are both provided with wear-resistant and corrosion-resistant coatings.
Preferably, the wear-resistant and corrosion-resistant coating is any one of a titanium-nickel-chromium heat-resistant alloy and a hastelloy alloy.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the screw thread section of the screw of the present invention.
Fig. 3 is a schematic view of the mutually matched molded lines of the driving screw and the driven screw of the present invention.
Fig. 4 is a state diagram of different angles for each 24 ° rotation of the driving screw and the driven screw.
Fig. 5 is the utility model discloses the screw rod sets up the schematic diagram in position sleeve and dynamic balance check hole.
Fig. 6 is a schematic structural diagram of an embodiment of the positioning assembly of the present invention.
Fig. 7 is a schematic diagram of the driven screw of the present invention with a cooling channel connected to the pump casing, the first mounting cover and the second mounting cover.
In the figure: 1. a driving screw; 11. a connecting section; 12. a threaded segment; 121. a tooth crest arc; 122. connecting the cycloid curves; 123. a tooth root arc; 124. a connecting straight line; 125. an envelope curve; 126. dynamic balance checking holes; 2. a driven screw; 3. a positioning assembly; 31. a positioning sleeve; 32. expanding and fastening the coupling sleeve; 33. connecting a pressing sleeve; 34. a fixing plate; 341. a threaded hole; 342. a bolt; 4. a helical gear; 5. a first mounting cover; 51. a first flow passage; 6. a second mounting cover; 61. a second flow passage; 7. a cooling flow channel; 8. a bearing; 9. a pump housing; 91. an inner pump casing; 92. an outer casing; 93. a cooling chamber; 94. a first water pipe; 95. a second water pipe; 96. and a third water pipe.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the various embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
As shown in fig. 1-7, the embodiment of the utility model provides a screw rod assembly of dry screw vacuum pump, including the opposite initiative screw rod 1 of screw thread handedness and driven screw rod 2, initiative screw rod 1 and driven screw rod 2 all include the linkage segment 11 of screw thread section 12 and screw thread section 12 both sides, be equipped with locating component 3 on the linkage segment 11. The positioning assembly 3 is used for relatively positioning (axially positioning) the driving screw 1 and the driven screw 2, and preferably, the positioning assembly 3 comprises: the utility model discloses a lead screw drive assembly, including initiative screw rod 1 and driven screw rod 2, the mutual complex position sleeve 31 that sets up respectively on initiative screw rod 1 and the driven screw rod 2, position sleeve 31 can adopt the position sleeve 31 of current pivot, the position subassembly still can include the current gear (like helical gear) of being connected with the position sleeve, fixes a position the gear on the dwang through the position sleeve, and the gear intermeshing on two screw rods avoids whole screw rod axial float.
The working principle and the beneficial effects of the technical scheme are as follows: set up locating component 3 and be used for making initiative screw rod 1 and 2 relative positioning (axial positioning) of driven screw rod, avoid current dry-type screw vacuum pump operating time overlength, the skew can take place for the relative position (axial relative position) of initiative screw rod 1 and driven screw rod 2, influences the meshing transmission of initiative screw rod and driven screw rod, causes the phenomenon that the card is pause to appear between the screw rod, reduces the functioning speed of screw rod, influences the work efficiency of dry-type screw vacuum pump.
In one embodiment, as shown in fig. 2-4, the profile of the end face of the threaded section 12 of the driving screw 1 is the same as that of the driven screw 2;
the molded line is composed of an addendum arc 121, a connecting cycloid 122, a dedendum arc 123, a connecting straight line 124 and an envelope curve 125 which are sequentially connected, the tangent of the dedendum arc 123 at the joint of the connecting straight line 124 and the dedendum arc 123 is collinear with the connecting straight line 124, the envelope curve 125 is in smooth transition with the addendum arc 121, and the envelope curves 125 of the driving screw 1 and the driven screw 2 are conjugated.
The curvature of the envelope curve 125 decreases from the end connected to the connecting straight line 124 to the end connected to the addendum arc 121;
preferably, in the above profile:
the radius Ra of the tooth root circular arc 123 is
Wherein r is the pitch circle radius;
the equation for the envelope curve 125 is:
wherein r is pitch radius, Ra is radius of tooth root arc, T1 is variable, and T1 value range T1 ∈ [0, pi/2 ]]。
The equation of the connecting line 124 is:
wherein T2 is variable, and T2 is the value range
The central angle corresponding to the connecting straight line 124 and the central angle corresponding to the envelope curve 125 are both a, and the size of a is pi/4;
the central angle corresponding to the addendum arc 121 and the central angle corresponding to the dedendum arc 123 are both B, and the size of B is 3 pi/4;
the equation for the root arc 123 is:
wherein T3 is variable, T3 has a value range of T3 ∈ [0, B]。
The equation of the addendum arc 121 is:
wherein Rb is radius of addendum arc, Rb is 2r-Ra, T4 is variable, and T4 is in range of T4 ∈ [0, B]。
The equation for the connecting cycloid 122 is:
wherein Rb is radius of addendum arc, Rb size is 2r-Ra, T5 is variable, T5 value range T5 ∈ [0, acos (r/Rb)]。
The working principle and the beneficial effects of the technical scheme are as follows: above-mentioned technical scheme can guarantee that initiative screw rod 1 and driven screw rod 2 can realize correct meshing when the incorgruous synchronous revolution, improves the work efficiency of dry-type screw rod vacuum pump, makes screw rotor root intensity high simultaneously, and screw rotor structure is simple relatively, realizes processing more convenient advantage.
As shown in fig. 4, in the rotation, 3-2 and 3-3 in fig. 4, the circular arc of the tooth root of one screw (such as a driving screw) is meshed with the circular arc of the tooth tip on the other screw (such as a driven screw); in fig. 4, 3-4 are the intersection points of the connecting cycloid of one screw and the connecting cycloid on the other screw and the addendum arc which are intersected are meshed; in fig. 4, 3-4 and 3-5 are the connecting cycloid of one screw and the intersection point of the connecting cycloid on the other screw and the addendum arc, and the intersection point of the connecting cycloid on one screw and the addendum arc is engaged with the connecting cycloid on the other screw; in fig. 4, 3-6 are the intersection point of the connecting cycloid on one screw and the addendum arc which are intersected with each other is meshed with the connecting cycloid on the other screw; in FIG. 4, 3-7, 3-8 and 3-9 are the addendum circular arc on one screw engaged with the dedendum circular section on the other screw; in FIG. 4, 3-10, 3-11 and 3-12 are the straight connecting lines on one screw rod meshed with the envelope curve on the other screw rod; in figure 4, 3-13, 3-14, 3-15 and 3-1 are the enveloping curves of one screw and the connecting straight lines on the other screw are meshed.
In one embodiment, as shown in fig. 5-6, the positioning assembly 3 comprises:
the expansion coupling sleeve 32 is sleeved at the connecting section 11;
and the connecting pressing sleeve 33 is sleeved on the outer wall of the expansion coupling sleeve 32, and the outer wall of the connecting pressing sleeve 33 is sleeved with the helical gear 4. The helical gears 4 on the driving screw 1 and the driven screw 2 are a pair of gears 4 which are meshed with each other. The expansion coupling sleeve is of the existing structure, and the connection between the expansion coupling sleeve and the helical gear is in the prior art;
the working principle and the beneficial effects of the technical scheme are as follows: when the structure is used, the thread sections 12 of the driving screw rod 1 and the driven screw rod 2 are mutually meshed and start to rotate, the expansion coupling sleeve 32 and the connection pressing sleeve 33 on the connecting section 11 of the driving screw rod 1 and the driven screw rod 2 are matched, the positions of the driving screw rod 1 and the driven screw rod 2 are kept constant, the bevel gear 4 can further keep the position constant, the structure has a good positioning effect, the relative positions of the driving screw rod 1 and the driven screw rod 2 are kept constant, and the motion stability of a screw rod assembly is ensured.
In one embodiment, as shown in fig. 5-6, the positioning assembly 3 further comprises:
a fixing plate 34, a through hole is arranged at the center of the fixing plate 34, the through hole is fixedly sleeved on the connecting section 11, and the fixing plate 34 is positioned at one side of the expansion coupling sleeve 32;
the upper part of the fixing plate 34 and the upper part of the bevel gear 4 are correspondingly provided with threaded through holes, the lower part of the fixing plate 34 and the lower part of the gear 4 are also correspondingly provided with threaded holes 341, and the fixing plate 34 and the gear 4 are connected through the corresponding threaded holes 341 by using bolts 342.
The working principle and the beneficial effects of the technical scheme are as follows: through setting up above-mentioned fixed plate 34 to and fixed plate 34 is connected through bolt 342 with helical gear 4, the fine setting helical gear 4's of being convenient for position promotes the location effect of locating component 3.
In one embodiment, as shown in fig. 1 and 7, a cooling channel 7 is provided at the axial center of the driven screw 2 along the axial direction of the driven screw 2;
the pump shell 9 of the vacuum pump comprises an inner layer pump shell 91 and an outer layer pump shell 92 connected outside the inner layer pump shell 91, a cooling chamber 93 is arranged between the inner layer pump shell 91 and the outer layer pump shell 92, and the upper end and the lower end of the cooling chamber 93 are respectively connected with the water inlet end of the water-cooled cooler through a first water pipe 94 and a second water pipe 95; water cooled chillers are known in the art.
The screw assembly further comprises: the mounting structure comprises a first mounting cover 5 and a second mounting cover 6, wherein the first mounting cover 5 and the second mounting cover 6 are respectively arranged at two ends of the driven screw rod 2;
a first flow channel 51 is arranged in the first mounting cover 5, one end of the first flow channel 51 is communicated with the cooling cavity 93, the first flow channel 51 is communicated with one end of the cooling flow channel 7, one end of the driven screw rod 2 is rotatably connected with the first mounting cover 5, and one end of the first mounting cover 5 is hermetically connected with one end of the driven screw rod 2;
a second flow channel 61 is arranged in the second mounting cover 6, one end of the second flow channel 61 is connected with the water return end of the water-cooled cooler through a sixth water pipe 96, the other end of the second flow channel 61 is communicated with the cooling flow channel 7, and the other end of the driven screw rod 2 is rotatably connected with the second mounting cover 6. Preferably, the driving screw 1 may also adopt the above heat dissipation structure. As shown in fig. 7, the first and second mounting caps 5 and 6 are coupled to the inner pump casing 91, and the screw is rotatably coupled to the first and second mounting caps 5 and 6 by a bearing 8 shown in fig. 7. Preferably, the cooling flow passage may not extend through both ends of the screw (not through the right end as shown in fig. 7), and the first and second mounting caps may be provided on the connection section of the screw (which may be close to both ends).
The working principle and the beneficial effects of the technical scheme are as follows: when the vacuum pump needs to be cooled and radiated, the water-cooled cooler is started, cooling water enters the cooling cavity 93 through the first water pipe 94 and the second water pipe 95 and enters the cooling flow passage 7 through the first flow passage 51, the water after absorbing heat enters the water return end of the water-cooled cooler through the second flow passage 61 and the third water pipe 96 to be cooled, the heat radiation of the vacuum pump is achieved in a circulating mode, the heat radiation structure radiates heat through the cooling cavity 93 of the pump shell 9 and the screw, the heat radiation structure has the advantage of good heat radiation effect, and the work efficiency of the dry screw vacuum pump is improved and the service life of the vacuum pump is prolonged.
In one embodiment, the surfaces of the driving screw 1 and the driving screw 1 are both provided with wear-resistant and corrosion-resistant coatings. Preferably, the wear-resistant and corrosion-resistant coating is any one of a titanium-nickel-chromium heat-resistant alloy and a hastelloy alloy.
The working principle and the beneficial effects of the technical scheme are as follows: set up wear-resisting anticorrosive coating, improve the wear-resisting and anticorrosive property of initiative screw rod 1 and driven screw rod 2, the wear-resisting and anticorrosive property of titanium nickel chromium heat-resisting alloy and hastelloy is good, can prolong the life of screw rod, and is convenient for the utility model discloses screw rod subassembly is stable work for a long time.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The screw assembly of the dry screw vacuum pump is characterized by comprising a driving screw (1) and a driven screw (2) with opposite screw thread turning directions, wherein the driving screw (1) and the driven screw (2) respectively comprise a screw thread section (12) and a connecting section (11) on two sides of the screw thread section (12), a positioning assembly (3) is arranged on the connecting section (11), and the positioning assembly (3) is used for enabling the driving screw (1) and the driven screw (2) to be relatively positioned.
2. Screw assembly of a dry screw vacuum pump according to claim 1, characterized in that the profile of the end faces of the threaded sections (12) of the driving screw (1) and the driven screw (2) is the same;
the molded lines are formed by tooth top circular arcs (121), connecting cycloids (122), tooth root circular arcs (123), connecting straight lines (124) and envelope curves (125), the tangent lines of the tooth root circular arcs (123) at the connecting positions of the connecting straight lines (124) and the tooth root circular arcs (123) are collinear with the connecting straight lines (124), the envelope curves (125) are in smooth transition between the tooth top circular arcs (121), and the envelope curves (125) of the driving screw (1) and the driven screw (2) are conjugated.
3. Screw assembly of a dry screw vacuum pump according to claim 2, characterized in that the envelope curve (125) decreases in curvature from the end connected to the connecting straight line (124) to the end connected to the addendum arc (121).
4. Screw assembly of a dry screw vacuum pump according to claim 1,
the positioning assembly (3) comprises: and the driving screw (1) and the driven screw (2) are respectively provided with a positioning sleeve (31) which is matched with each other.
5. Screw assembly of a dry screw vacuum pump according to claim 1,
the positioning assembly (3) comprises:
the expansion coupling sleeve (32) is sleeved at the connecting section (11);
the connecting pressing sleeve (33) is sleeved on the outer wall of the expansion coupling sleeve (32), and the outer wall of the connecting pressing sleeve (33) is sleeved with the helical gear (4).
6. Screw assembly of a dry screw vacuum pump according to claim 5, wherein the positioning assembly (3) further comprises:
the center of the fixing plate (34) is provided with a through hole, the through hole is fixedly sleeved on the connecting section (11), and the fixing plate (34) is positioned on one side of the expansion coupling sleeve (32);
the upper part of the fixing plate (34) and the upper part of the bevel gear (4) are correspondingly provided with threaded through holes, the lower part of the fixing plate (34) and the lower part of the bevel gear (4) are also correspondingly provided with threaded holes (341), and the fixing plate (34) is connected with the gear through the corresponding threaded holes (341) by using bolts (342).
7. Screw assembly of a dry screw vacuum pump according to claim 1,
and a cooling flow channel (7) along the axial direction of the driven screw (2) is arranged at the axis of the driven screw (2).
8. Screw assembly of a dry screw vacuum pump according to claim 7,
the pump shell (9) of the vacuum pump comprises an inner layer pump shell (91) and an outer layer pump shell (92) connected outside the inner layer pump shell (91), a cooling chamber (93) is arranged between the inner layer pump shell (91) and the outer layer pump shell (92), and the upper end and the lower end of the cooling chamber (93) are respectively connected with the water inlet end of the water-cooled cooler through a first water pipe (94) and a second water pipe (95);
the screw assembly further comprises: the mounting structure comprises a first mounting cover (5) and a second mounting cover (6), wherein the first mounting cover (5) and the second mounting cover (6) are respectively arranged at two ends of a driven screw rod (2);
a first flow channel (51) is arranged in the first mounting cover (5), one end of the first flow channel (51) is communicated with the cooling cavity (93), the first flow channel (51) is communicated with one end of the cooling flow channel (7), one end of the driven screw (2) is rotatably connected with the first mounting cover (5), and one end of the first mounting cover (5) is hermetically connected with one end of the driven screw (2);
the water-cooled type cooling device is characterized in that a second flow channel (61) is arranged in the second mounting cover (6), one end of the second flow channel (61) is connected with a water return end of the water-cooled type cooling device through a sixth water pipe (96), the other end of the second flow channel (61) is communicated with the cooling flow channel (7), and the other end of the driven screw rod (2) is rotatably connected with the second mounting cover (6).
9. Screw assembly of a dry screw vacuum pump according to claim 1, characterized in that the surfaces of the drive screw (1) and the drive screw (1) are provided with a wear resistant and corrosion resistant coating.
10. A screw assembly of a dry screw vacuum pump according to claim 9, wherein the wear resistant and corrosion resistant coating is any one of a titanium-nickel-chromium heat resistant alloy and hastelloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921956685.1U CN210977867U (en) | 2019-11-13 | 2019-11-13 | Screw assembly of dry screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921956685.1U CN210977867U (en) | 2019-11-13 | 2019-11-13 | Screw assembly of dry screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210977867U true CN210977867U (en) | 2020-07-10 |
Family
ID=71447432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921956685.1U Active CN210977867U (en) | 2019-11-13 | 2019-11-13 | Screw assembly of dry screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210977867U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562456A (en) * | 2022-03-18 | 2022-05-31 | 四川莱斯特真空科技有限公司 | Screw rotor and assembly thereof |
-
2019
- 2019-11-13 CN CN201921956685.1U patent/CN210977867U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562456A (en) * | 2022-03-18 | 2022-05-31 | 四川莱斯特真空科技有限公司 | Screw rotor and assembly thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101435425A (en) | Novel tooth form of screw rod rotor of double-screw compressor | |
| CN210977867U (en) | Screw assembly of dry screw vacuum pump | |
| CN112211975A (en) | Self-lubricating ball screw pair | |
| CN1544814A (en) | Medium-high pressure gear pump having asymmetric double-circular-arc gear shape | |
| CN206495780U (en) | High temperature aluminium liquid delivery pump | |
| CN111173750A (en) | Roots vacuum pump adopting helical gear preposed structure | |
| CN108050211A (en) | NN type Hypocycloid pinwheel planetary reduction gears | |
| CN114162337B (en) | Windshield system for reducing oil injection lubrication windage loss of high-speed spiral bevel gear | |
| CN206017133U (en) | A kind of internal messing button pump | |
| CN210769213U (en) | Oil pumping structure for compressor | |
| CN206206540U (en) | Worm screw with built-in lubrication system | |
| US4614484A (en) | Rotary screw compressor with specific tooth profile | |
| CN216714692U (en) | Bidirectional cycloid pump based on special eccentric ring | |
| KR20130012560A (en) | Gear pump | |
| CN221120828U (en) | Wear-resisting gear shaft | |
| CN213808715U (en) | Self-lubricating ball screw pair | |
| CN111779812A (en) | Mechanical speed reducer capable of outputting reciprocating swing | |
| CN201110135Y (en) | Ball dental type versatile spindle for screw drill | |
| CN2378553Y (en) | Efficient small displacement high pressure gear oil pump | |
| CN216642444U (en) | Sliding bearing oil groove structure of internal gear pump | |
| CN207894603U (en) | A kind of regulating mechanism of symmetrical shaft type axial variable displacement plunger pump | |
| CN218816995U (en) | Oil suction pipe with spiral oil suction spacer | |
| CN221257109U (en) | Internal gear pump with gasket | |
| CN220338199U (en) | Oil pump capable of increasing oil transmission quantity | |
| CN215411977U (en) | Fuel nozzle of gas turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 18 Xinxiu Road, Haimen Street, Haimen District, Nantong City, Jiangsu Province, 226100 Patentee after: Haimen Jingsheng Vacuum Equipment Co.,Ltd. Address before: 226100 No.18 Xinxiu Road, Haimen City, Nantong City, Jiangsu Province Patentee before: Haimen Jingsheng Vacuum Equipment Co.,Ltd. |