CN106762656B - A kind of pump case of screw vacuum pump - Google Patents
A kind of pump case of screw vacuum pump Download PDFInfo
- Publication number
- CN106762656B CN106762656B CN201710045789.6A CN201710045789A CN106762656B CN 106762656 B CN106762656 B CN 106762656B CN 201710045789 A CN201710045789 A CN 201710045789A CN 106762656 B CN106762656 B CN 106762656B
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- Prior art keywords
- pump
- housing
- fixed
- screw vacuum
- inner housing
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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
- 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
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid
-
- 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
- F04C2240/30—Casings or housings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The present invention provides a kind of pump cases of screw vacuum pump, belong to screw vacuum pump technical field.It solves the technical problems such as the pump case higher operating costs of existing screw vacuum pump.The pump case of this screw vacuum pump includes the pump housing with pump chamber, there is cooling water cavity in the pump housing, the pump housing is several outer housings and inner housing made of corrosion-resistant metal is used to form, there is above-mentioned pump chamber in inner housing, fixation fin there are two having along its length on the outer wall of inner housing in a ring, several outer housings are arranged between two fixed fins and several outer housings are distributed in a ring, welded seal between the both ends edge of outer housing and fixed fin, the opposite edge welded seal of adjacent shells body, forms above-mentioned cooling water cavity between several outer housings and inner housing.The present invention has the advantages that the setting anti-corrosion structure on pump case is not necessarily in the case where guarantee pump case cooling can be realized the Corrosion Protection of pump case.
Description
Technical field
The invention belongs to screw vacuum pump technical fields, are related to a kind of pump case of screw vacuum pump.
Background technique
Screw vacuum pump is the air-breathing and exhaust for making synchronous high-speed in the pump housing using two screw rods and reversely rotating and generating
The air-extractor of effect, it is the renewal product of oil sealing vacuum pump, can extract and contain a large amount of water vapours and a small amount of dust
Gas occasion, major pharmacy and chemical company are used widely at home.
Screw vacuum pump can cause to generate heat due to squeezing gas when in use, and cooling water cavity is arranged in pump case domestic demand, together
When screw vacuum pump its abstraction in use gas there is corrosivity, therefore the pump chamber inner wall of pump case needs to do at anticorrosion
Reason.The pump case of screw vacuum pump is integrally formed since the mobility of corrosion-resistant metal is poor on the market at present, Wu Fajin
The techniques such as row casting once obtain pump case；Therefore the current pump case of screw vacuum pump on the market is all made of cast iron materials and passes through casting
One-pass molding, by having cooling water cavity in the pump case of cast molding, mobility is preferable after melting for cast iron, therefore is suitble to casting
Technique, but the anticorrosive property of cast iron is poor, pump case needs after molding are coated in pump chamber in erosion shield or fixation
The anti-corrosion treatments such as bushing are needed in use for some time although being able to achieve anticorrosion to erosion shield or interior
Bushing is conserved, and avoiding erosion shield or neck bush from wear-out failure occur causes pump case to be corroded, and leads to use cost
It is higher.
Summary of the invention
The purpose of the present invention is there is the above problem in view of the prior art, a kind of pump case of screw vacuum pump is proposed,
Present invention solves the technical problem that be can be real it is not necessary that anti-corrosion structure is arranged on pump case in the case where guaranteeing that pump case is cooling
The Corrosion Protection of existing pump case.
Object of the invention can be realized by the following technical scheme:
A kind of pump case of screw vacuum pump has cooling water cavity, feature including the pump housing with pump chamber in the pump housing
It is, the pump housing is several outer housings and inner housing made of corrosion-resistant metal is used to form, and has in the inner housing
Above-mentioned pump chamber, has that there are two fixation fin in a ring, several outer housings on the outer wall of the inner housing along its length
It is arranged between two fixed fins and several outer housings is distributed in a ring, the both ends edge of the outer housing and fixed fin
Between welded seal, the opposite edge welded seal of the adjacent outer housing formed between several outer housings and inner housing
Above-mentioned cooling water cavity.
Welding when using sealing welding technique by between outer housing and inner housing gap and adjacent shells body between
Clearance seal, to guarantee the sealing of the cooling water cavity between outer housing and inner housing；Outer housing and inner housing are separately formed,
Outer housing is fixed on inner housing by welding again, makes inner housing that corrosion-resistant metal essence casting can be used by split type structure
It is made, so that inner housing has etch-proof characteristic, without increasing erosion shield or neck bush on inner housing
The anticorrosion of inner housing can be realized in structure, eliminates the maintenance in use process, improves service efficiency, reduce use at
This；Make outer housing that there is between inner housing gap when being fixed on inner housing by two fixed fins and forms cooling
Water cavity, cooling water energy guarantee the normal use of screw vacuum pump when in use to the cooling of inner housing；Inner housing can be used stainless
Steel or titanium alloy or monel metal or Hastelloy essence casting form；Pass through several outer housings and inner casing of split settings
Body realizes the anticorrosion of inner housing itself, opposite to increase anti-corrosion structure on inner housing, improves the anticorrosive property of the pump housing
Energy.
In the pump case of above-mentioned screw vacuum pump, two fixed fins are provided with positioning table on opposite side
Rank, the both ends edge of the outer housing are separately positioned on the positioning step of two fixed fins and weld to form annular
Weld seam one.Positioning step can position the position of outer housing when welding outer housing, so that outer housing welding position is more accurate and mentions
The intensity that height is welded and fixed.
In the pump case of above-mentioned screw vacuum pump, consolidating for two fixed fins is connected with several on the inner housing
Determine item, the fixed strip edge opposite with the adjacent outer housing is aligned, the opposite edge of the adjacent outer housing with it is corresponding
Fixed strip weld and formed the weld seam two in bar shaped, the both ends of the weld seam two and weld seam one are fixed.Adjacent shells body passes through
Weld seam two is fixed with fixed strip, makes adjacent shells body weld strength higher by fixed strip, and fixed strip is supported with outer housing
It leans on, increases outer housing bending strength, improve the integral strength of pump case, weld seam two and weld seam one connect so that cooling water cavity keeps close
Envelope.
In the pump case of above-mentioned screw vacuum pump, several water holes are provided on the fixed strip.Made by water hole
Cavity between outer housing and inner housing is connected to the cooling water cavity formed around inner housing, so that cooling water energy is around cooling water
Chamber circulation, achievees the purpose that uniformly to cool down inner housing.
It is located between two fixed fins in the pump case of above-mentioned screw vacuum pump, on the inner housing with several
Stay, the support bar is vertical with stiffener and intersects, at least one connection recess, the support bar are provided on the support bar
Can with corresponding outer housing against.Support bar can improve the intensity of inner housing, while support bar energy support housing body, avoid shell
There is the case where middle part indent causes weld to damage in body, and connection recess can make cooling water energy free in cooling water cavity
Flowing avoids the occurrence of heat and concentrates the situation for causing heat dissipation effect bad, improves cooling effect.
In the pump case of above-mentioned screw vacuum pump, the middle part on the outer peripheral surface of the inner housing positioned at upper and lower two sides has
There is the cambered surface of indent.The wall thickness of two middle side parts is thicker above and below inner housing, and the cooling in order to guarantee inner housing is uniform, by setting
Recessed cambered surface can reduce the wall thickness of two middle side parts of inner housing or more, and heat is uniformly shed on inner housing, guarantee pump chamber
Size it is uniform.
It is located between two fixed fins in the pump case of above-mentioned screw vacuum pump, on the inner housing and is in several
The stiffener of annular, the width of the stiffener are less than the width of fixed fin.The width of stiffener refers to the side of stiffener
Along the distance between the outer peripheral surface for arriving inner housing, the width of fixed fin refers to the edge to the periphery of inner housing of fixed fin
The distance between face；Stiffener can improve the intensity of inner housing, so that the intensity of separately formed inner housing meets screw vacuum
The requirement of pump.
The ventilation being connected to pump chamber is provided in the pump case of above-mentioned screw vacuum pump, on fixed strip described in two of them
Hole is provided with gas nozzle that is raised on the fixed strip of venthole and being connected to venthole, with the fixation for being provided with venthole
Be provided on item corresponding adjacent shells body edge for gas nozzle across resigning recess and welded seal gas nozzle and outer housing.
Venthole is used for the exhaust of screw vacuum pump, and gas nozzle is for connecting external pipeline；Since the thermal expansion of corrosion-resistant metal is larger,
It is respectively provided with venthole on two fixed strips and guarantees that inner housing heat expansion is uniform, the two sides of fixed strip can be touched positioned at cooling water cavity
Cooling water, can be fully cooled to by the gas of venthole.
In the pump case of above-mentioned screw vacuum pump, being provided on the fixed strip of venthole has adding to two sides protrusion
Strong protrusion, the end face of the side for reinforcing protrusion and fixed strip, the gas nozzle are located between two reinforcement protrusions.It is fixed
The position intensity that venthole is provided on item is weaker, can increase the strong of the position that venthole is provided on fixed strip by reinforcement protrusion
Degree.
In the pump case of above-mentioned screw vacuum pump, there are two the outer housing tools, including outer housing one and outer housing two,
The outer housing one and outer housing two are in U-typed；Above-mentioned fixed strip have two, two fixed strip mirror settings, institute
The both ends at the both ends and outer housing two of stating outer housing one are oppositely arranged, the outer housing one and the opposite end of outer housing two
It is welded and fixed with corresponding fixed strip.Outer housing one is identical with the structure of outer housing two and size is also identical, reduces components
Type, facilitate production, reduce costs；Weld seam is located between outer housing one, outer housing two and fixed strip, i.e., so that shell
Body one and outer housing two are fixed with fixed strip respectively, while but also outer housing one and outer housing two are fixed to each other, and are further increased
The fixing intensity between outer housing one, outer housing two and inner housing is added.
In the pump case of above-mentioned screw vacuum pump, one of them fixed fin is located at one end of inner housing, described
Venthole is integrally formed on the fixation fin of one end of inner housing close to one end of inner housing there are two stabilizer blade, another
The fixed fin is located at the middle part of inner housing, and the other end of the inner housing has a flange fin, one on the flange fin
It is body formed that there are two stabilizer blades.Fixation fin positioned at one end of inner housing is used for connection end cap, and flange fin is used to connect side cover,
Inner housing have flange fin one end be air inlet, screw vacuum pump at runtime close to one end calorific value of air inlet compared with
It is few, and the calorific value close to one end of venthole is larger, the position of two fixed fins make cooling water cavity correspond to calorific value compared with
Big one section, design are reasonable.
Compared with prior art, the pump case of this screw vacuum pump has the Corrosion Protection for improving the pump housing, while also having
There are good cooling results, the lower advantage of the expansion rate of the pump housing.
Detailed description of the invention
Fig. 1 is the schematic perspective view and partial enlargement diagram of pump case.
Fig. 2 is the explosive view of the pump housing.
Fig. 3 is the schematic cross-sectional view and partial enlargement diagram of the pump housing.
Fig. 4 is the schematic cross-sectional view and partial enlargement diagram in another direction of the pump housing.
Fig. 5 is the schematic perspective view and partial enlargement diagram of inner housing.
In figure, 1, the pump housing；11, pump chamber；12, cooling water cavity；2, outer housing one；21, outer housing two；22, limbers；23,
Resigning recess；24a, weld seam one；24b, weld seam two；3, inner housing；31, fixed fin；311, positioning step；32, fixed strip；
321, reinforce protrusion；322, water hole；323, venthole；324, gas nozzle；33, stiffener；34, support bar；341, it is connected to recess；
35, cambered surface；4, stabilizer blade；5, flange fin；51, ring stiffener；52, bar shaped reinforcing rib；6, outer housing.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
As shown in Figures 1 to 4, the pump case of screw vacuum pump includes the pump housing 1 with pump chamber 11, has cooling in the pump housing 1
Water cavity 12, the pump housing 1 is several outer housings 6 and inner housing 3 made of corrosion-resistant metal is used to form, outer housing in the present embodiment
6 include outer housing 1 and outer housing 2 21, has above-mentioned pump chamber 11 in inner housing 3, specifically, inner housing 3 can be used stainless
Steel or titanium alloy or monel metal or Hastelloy essence casting form.
Have along its length as described in Fig. 2 to Fig. 5, on inner housing 3 there are two fixation fin 31 in a ring, one of them
Fixed fin 31 is located at one end of inner housing 3, and there are two stabilizer blades for integrated molding on the fixation fin 31 of one end of inner housing 3
4, another is fixed fin 31 and is located at the middle part of inner housing 3, and the other end of inner housing 3 is with flange fin 5, on flange fin 5
Stabilizer blade 4 there are two being integrally formed.It is located at flange fin 5 on inner housing 3 and between the fixation fin 31 at the middle part of inner housing 3
With ring stiffener 51 and the bar shaped reinforcing rib 52 vertical with ring stiffener 51.
As described in Fig. 2 to Fig. 5, positioning step 311, outer housing 1 are provided on two opposite sides of fixed fin 31
Two sides edge and outer housing 2 21 two sides along can bear against on the positioning step 311 of two fixed fins 31 and weld
Connect one 24a of weld seam to form annular, the fixed strip 32 with two connections, two fixed fins 31 on inner housing 3, fixed strip 32
On be provided with several water holes 322.The edge of outer housing 1 is welded and fixed with two fixed fins 31 and two fixed strips 32, outside
The edge of shell 2 21 is welded and fixed with two fixed fins 31 and two fixed strips 32, outer housing 1, outer housing 2 21 and interior
Above-mentioned cooling water cavity 12 is formed between shell 3, is provided with limbers 22 on outer housing 1 and outer housing 2 21.
As described in Fig. 2 to Fig. 5, being located between two fixed fins 31 on inner housing 3 has several stiffeners in a ring
33, the width of stiffener 33 is less than the width of fixed fin 31.It is located between two fixed fins 31 on inner housing 3 with several
Support bar 34, support bar 34 is vertical with stiffener 33 and intersects, at least one connection recess 341 is provided on support bar 34, several
It is two groups that support bar 34, which is divided to, and every group of support bar 34 all has two support bars 34, wherein one group of support bar 34 can be with outer housing 1
Against, another group of support bar 34 can with outer housing 2 21 against.Middle part on the outer peripheral surface of inner housing 3 positioned at upper and lower two sides has
There is the cambered surface 35 of indent, cambered surface 35 is located between two support bars 34 with group.
As described in Fig. 2 to Fig. 5, two 32 mirror settings of fixed strip, outer housing 1 and outer housing 2 21 are in U-typed, outside
The both ends of shell 1 and the both ends of outer housing 2 21 are oppositely arranged, outer housing 1 and the opposite end of outer housing 2 21 with
Welding forms two 24b of weld seam between corresponding fixed strip 32.The venthole being connected to pump chamber 11 is provided on two fixed strips 32
323, venthole 323 is raised on one end of inner housing 3, fixed strip 32 and the gas nozzle that is connected to venthole 323
324, the edge of outer housing 1 and outer housing 2 21 is provided with the resigning recess 23 of semicircular in shape, the resigning recess of outer housing 1
23 and the resigning recess 23 of outer housing 2 21 be oppositely arranged, gas nozzle 324 is pierced by the resigning recess of outer housing 1 and outer housing 2 21
23, and gas nozzle 324 is welded and fixed with outer housing 1 and outer housing 2 21.Have the reinforcement to two sides protrusion convex on fixed strip 32
Portion 321, gas nozzle 324 are located at the two sides for reinforcing protrusion 321.
Outer housing 1, outer housing 2 21 and inner housing 3 are separately formed, then by welding outer housing 1 and outer housing two
21 are fixed on inner housing 3, make inner housing 3 that corrosion-resistant metal essence casting can be used by split type structure and are made, so that
Inner housing 3 has etch-proof characteristic, and the structure without increasing erosion shield or neck bush on inner housing 3 can be realized
The anticorrosion of inner housing 3 eliminates the maintenance in use process, improves service efficiency, reduces use cost；Pass through two
Fixed fin 31 and two fixed strips 32 make outer housing 1 and outer housing 2 21 when being fixed on inner housing 3 and inner housing 3
Between there is gap and form cooling water cavity 12, cooling water can by the limbers 22 on outer housing 1 and outer housing 2 21 into
Cooling water cavity 12 out, cooling when guaranteeing to use to inner housing 3, guarantee the normal use of screw vacuum pump.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (10)
1. a kind of pump case of screw vacuum pump has cooling water including the pump housing (1) with pump chamber (11) in the pump housing (1)
Chamber (12), the pump housing (1) is several outer housings (6) and inner housing (3) made of corrosion-resistant metal is used to form, described interior
There are above-mentioned pump chamber (11) in shell (3), there are two fixations in a ring for tool along its length on the outer wall of the inner housing (3)
Fin (31), which is characterized in that several outer housings (6) are arranged between two fixed fins (31) and several outer housings
(6) it is distributed in a ring, welded seal between the both ends edge of the outer housing (6) and fixed fin (31), the adjacent shell
The opposite edge welded seal of body (6) forms above-mentioned cooling water cavity (12) between several outer housings (6) and inner housing (3),
The fixed strip (32) of two fixed fins (31), fixed strip described in two of them are connected on the inner housing (3) with several
(32) connection pump chamber (11) and extraneous venthole (323) are provided on.
2. the pump case of screw vacuum pump according to claim 1, which is characterized in that two fixed fins (31) are opposite
Side on be provided with positioning step (311), the both ends edge of the outer housing (6) is separately positioned on two fixed fins
(31) on positioning step (311) and the weld seam one (24a) to form annular is welded.
3. the pump case of screw vacuum pump according to claim 2, which is characterized in that the fixed strip (32) with it is adjacent described
The opposite edge alignment of outer housing (6), the opposite edge of the adjacent outer housing (6) is welded with corresponding fixed strip (32) and shape
At the weld seam two (24b) for being in bar shaped, the both ends of the weld seam two (24b) and weld seam one (24a) are fixed.
4. the pump case of screw vacuum pump according to claim 3, which is characterized in that be provided on the fixed strip (32) several
Water hole (322).
5. the pump case of screw vacuum pump as claimed in any of claims 1 to 4, which is characterized in that the inner housing
(3) being located between two fixed fins (31) on has several stiffeners (33) in a ring, the width of the stiffener (33)
Less than the width of fixed fin (31).
6. the pump case of screw vacuum pump according to claim 5, which is characterized in that be located at two on the inner housing (3)
There are several support bars (34) between fixed fin (31), the support bar (34) is vertical with stiffener (33) and intersects, described
Be provided on support bar (34) at least one connection recess (341), the support bar (34) can with corresponding outer housing (6) against.
7. the pump case of screw vacuum pump as claimed in any of claims 1 to 4, which is characterized in that the inner housing
(3) it is located at the cambered surface (35) that indent is all had in the middle part of upper and lower two sides on outer peripheral surface.
8. the pump case of screw vacuum pump according to claim 3 or 4, which is characterized in that be provided with the described of venthole (323)
The raised and gas nozzle (324) that is connected to venthole (323) on fixed strip (32), with the fixation for being provided with venthole (323)
Item (32) is provided with the resigning recess (23) passed through for gas nozzle (324) and gas nozzle (324) on corresponding adjacent shells body (6) edge
The welded seal between outer housing (6).
9. the pump case of screw vacuum pump according to claim 8, which is characterized in that be provided with the described solid of venthole (323)
Determine to have on item (32) to the reinforcement protrusion (321) of two sides protrusion, the side for reinforcing protrusion (321) and fixed strip (32)
End face, the gas nozzle (324) are located between two reinforcement protrusions (321).
10. the pump case of screw vacuum pump as claimed in any of claims 1 to 4, which is characterized in that the outer housing
(6) there are two tool, including outer housing one (2) and outer housing two (21), the outer housing one (2) and outer housing two (21) are in
U-typed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710045789.6A CN106762656B (en) | 2017-01-21 | 2017-01-21 | A kind of pump case of screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710045789.6A CN106762656B (en) | 2017-01-21 | 2017-01-21 | A kind of pump case of screw vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106762656A CN106762656A (en) | 2017-05-31 |
| CN106762656B true CN106762656B (en) | 2019-02-12 |
Family
ID=58943751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710045789.6A Active CN106762656B (en) | 2017-01-21 | 2017-01-21 | A kind of pump case of screw vacuum pump |
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| Country | Link |
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| CN (1) | CN106762656B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269521B (en) * | 2017-08-14 | 2018-06-29 | 浙江威肯特智能机械有限公司 | A kind of high-precision high voltage three screw pump bushing and manufacturing process |
| CN112177926B (en) * | 2020-09-30 | 2022-11-22 | 浙江思科瑞真空技术有限公司 | Pump body design |
| CN114198301A (en) * | 2021-12-07 | 2022-03-18 | 王志里 | Pump body structure |
| CN116498554B (en) * | 2023-04-18 | 2024-07-12 | 北京通嘉宏瑞科技有限公司 | Vacuum pump stator |
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| CN104179180A (en) * | 2014-08-22 | 2014-12-03 | 江苏巨威机械有限公司 | Integrated lower cylinder with ribbed water chamber and tubular diesel pile hammer with same |
| CN206458605U (en) * | 2017-01-21 | 2017-09-01 | 浙江创为真空设备有限公司 | A kind of pump case of screw vacuum pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB739627A (en) * | 1954-02-03 | 1955-11-02 | Svenska Rotor Maskiner Ab | Improvements in or relating to rotary engines or compressors |
| CN2883735Y (en) * | 2006-04-18 | 2007-03-28 | 四川省机械研究设计院 | Embedded high temp geared pump |
| CN201129296Y (en) * | 2007-12-12 | 2008-10-08 | 天津泵业机械集团有限公司 | Vertical type double-layer pump body high temperature double-screw rod cargo oil pump |
| CN201159172Y (en) * | 2008-02-01 | 2008-12-03 | 梁伯顺 | Improved structure of screw vacuum pump |
| CN202550756U (en) * | 2012-04-06 | 2012-11-21 | 联合汽车电子有限公司 | Drive motor case of automobile |
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| CN203978827U (en) * | 2014-07-10 | 2014-12-03 | 浙江凯顺铸造有限公司 | A kind of Roots pump of good cooling results |
| CN104179180A (en) * | 2014-08-22 | 2014-12-03 | 江苏巨威机械有限公司 | Integrated lower cylinder with ribbed water chamber and tubular diesel pile hammer with same |
| CN206458605U (en) * | 2017-01-21 | 2017-09-01 | 浙江创为真空设备有限公司 | A kind of pump case of screw vacuum pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106762656A (en) | 2017-05-31 |
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Address after: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant after: Zhejiang created as a vacuum equipment Limited by Share Ltd Address before: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant before: ZHEJIANG CHUANGWEI VACUUM EQUIPMENT CO., LTD. |
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