CN205388012U - Lower cantilever screw vacuum pump's hollow screw structure - Google Patents
Lower cantilever screw vacuum pump's hollow screw structure Download PDFInfo
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- CN205388012U CN205388012U CN201620227302.7U CN201620227302U CN205388012U CN 205388012 U CN205388012 U CN 205388012U CN 201620227302 U CN201620227302 U CN 201620227302U CN 205388012 U CN205388012 U CN 205388012U
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Abstract
The utility model relates to a lower cantilever screw vacuum pump's hollow screw structure, screw rod is constituteed with setting up at the concentric shaft of spiral rotor one end pole by spiral rotor to its structure the system has closing inner cavity among the spiral rotor, the axostylus axostyle is hollow axostylus axostyle, the core hole of hollow axostylus axostyle with closing inner cavity among the spiral rotor is linked together, it has the coolant oil conveyer pipe to peg graft in the hollow axostylus axostyle, the lower port of coolant oil conveyer pipe is pegged graft and is arrived among spiral rotor's the closing inner cavity, the last port of coolant oil conveyer pipe extends to the outside of hollow axostylus axostyle. The utility model discloses can make the direct hollow screw's of coolant oil bottom, most heat among the spiral rotor is taken away to the coolant oil to control hollow screw's temperature rise and thermal energy effectively, avoided the thermal energy inhomogeneous and produce friction or the card phenomenon of dying, improved time cantilever screw vacuum pump moving stability and reliability.
Description
Technical field
This utility model relates to the screw rod in a kind of screw vacuum pump, specifically the cored screw structure of a kind of lower cantalever screw vacuum pump.
Background technology
The primary structure of screw vacuum pump is to be provided with a pair oppositely oriented screw rod in pump case, including an active screw rod and a driven screw, motor drives actively screw rod to rotate, drive driven screw to do synchronous high-speed in pump case by a pair high-precision synchromesh gear to reversely rotate, thus produce the suction force of aspiration vacuum simultaneously.Screw vacuum pump belongs to non-contact type dry pump, do not rub between active screw rod and driven screw, between screw rod and the pump housing and keep certain gap, in order to reach only small limiting pressure, improving pumping velocity, above-mentioned gap is typically designed as 0.05mm～0.4mm.The heat produced after gas compression is caused that extruder temperature raises by screw vacuum pump operationally a pair intermeshing screw rod, for instance capacity 140m3The vacuum pump of/h, its delivery temperature is close to 200 DEG C, and this will make screw rod produce very big thermal expansion deformation, and too small matched in clearance, it is easy to cause that screw rod causes abrasion or stuck phenomenon.The temperature rise of screw vacuum pump is more high, and the thermal expansion deformation of generation is more big.For this, bigger fit clearance will be reserved between screw rod and screw rod and between screw rod and pump chamber, with avoid produce friction；But gap is big can affect again the effect of vacuum pump evacuation in turn.
In order to reduce the screw rod operating temperature rise of screw vacuum pump, some screw vacuum pump is to arrange cooling water channel on the bearing housing at pump case and two ends, cool down with the end axostylus axostyle to screw rod, but owing to this type of cooling is not the helical rotor part directly acting on screw rod, screw rod can not be carried out effective temperature-reducing, thus the cooling effect of screw rod is very undesirable.
Utility model content
The purpose of this utility model is just to provide the cored screw structure of a kind of lower cantalever screw vacuum pump, to solve the problem that screw rod can not be carried out effective temperature-reducing by lower cantalever screw vacuum pump.
This utility model is achieved in that the cored screw structure of a kind of lower cantalever screw vacuum pump, screw rod is formed by helical rotor and the concentric axostylus axostyle being arranged on helical rotor one end, described helical rotor is shaped with closing inner chamber, described axostylus axostyle is hollow axis pole, the closing intracavity inter-connection in the core bore of described hollow axis pole and described helical rotor；Described hollow axis pole is plugged with cooling oil conveying pipe, the lower port of described cooling oil conveying pipe is plugged in the closing inner chamber of described helical rotor, the described upper port cooling down oil conveying pipe extends to the outside of described hollow axis pole, carries to remain with between pipe and the core bore of described hollow axis pole at described cooling oil and crosses oil-gap for what cooling oil exported.
The upper port cross-under of described cooling oil conveying pipe is on the cooling oil box being arranged at lower cantalever screw vacuum pump top, and connects with cooling oil fuel delivery device.
Having cooling-oil outlet on described cooling oil box, described cooling-oil outlet is connected on cooling oil fuel delivery device by pipeline, constitutes way to cycle oil.
Lower cantalever screw vacuum pump is a kind of new screw vacuum pump that applicant designs, its structure is that the helical rotor part of screw rod and housing portion are arranged on the bottom of the pump housing, the support of screw rod and running part are arranged on the top of pump case, making screw rod is that the lower cantalever structure of suspension type is arranged in the pump housing, to form the lower cantalever structure of the single-ended support of screw rod in vacuum pump.But, the existing vacuum pump type of cooling is not but suitable for the screw vacuum pump of this new structure.
nullThis utility model is that screw design becomes the single-ended hollow structure opened，By inserting the cooling oil conveying pipe in screw core，The cooling oil that can make outside enters in the inner chamber of helical rotor smoothly，Simultaneously，The gap between cooling oil conveying pipe and screw core is utilized to form way to cycle oil，Thus the helical rotor part of screw rod can be carried out directly effective internal cooling cooling，Thus the screw rod thermal expansion problem thoroughly solved in lower cantalever screw vacuum pump，Lower cantalever screw vacuum pump held stationary is enable to run，Screw rod when avoiding lower cantalever screw vacuum pump work weares and teares or stuck phenomenon，And，When screw rod operating temperature rise effectively reduces，Only small matched in clearance just can be realized between screw rod and screw rod and between screw rod and pump chamber，The evacuation efficiency making lower cantalever screw vacuum pump improves further，And continual and steady running status can be kept.
Accompanying drawing explanation
Fig. 1 is the work structuring schematic diagram that this utility model is applied in lower cantalever screw vacuum pump.
In figure: 1, cooling oil box, 2, cooling-oil inlet, 3, cooling-oil outlet, 4, upper bearing (metal), 5, synchromesh gear, 6, top bearing housing 7, lower bearing, 8, mechanical seal, 9, actively screw rod, 10, driven screw, 11, pump case, 12, the first cooling oil conveying pipe, 13, the second cooling oil conveying pipe, 14, lower bearing housing, 15, close inner chamber.
Detailed description of the invention
As shown in Figure 1 be the vertical lower cantalever screw vacuum pump of one that applicant designs, this vertical lower cantalever screw vacuum pump is that the suitable for reading of pump case 11 is provided with lower bearing housing 14, the top of lower bearing housing 14 is provided with top bearing housing 6, the top of top bearing housing 6 is provided with cooling oil box 1.Lower bearing housing 14 is provided with two groups of juxtaposed lower bearings 7, top bearing housing 6 is provided with two groups of juxtaposed upper bearing (metal)s 4.Lower bearing housing 14 is involutory up and down with the port of top bearing housing 6, forms the cavity of the upper shaft holding two screw rods.Actively screw rod 9 and driven screw 10 are two screw rods of symmetrical configuration, and it is helical rotor that the part in pump case 11 is stretched in the bottom of two screw rods, the top of two screw rods respectively shaft portion.
Actively the axostylus axostyle of screw rod 9 and the axostylus axostyle of driven screw 10 are supported location by one group of upper bearing (metal) 4 and one group of lower bearing 7 respectively.Actively the helical rotor of screw rod 9 bottom and the helical rotor of driven screw 10 bottom are uprightly arranged in the pump chamber of pump case 11 side by side, and keep the state of mutual luer engages with.The axostylus axostyle of active screw rod 9 and the axostylus axostyle of driven screw 10 are separately installed with synchromesh gear 5, synchromesh gear 5 on two axostylus axostyles engages each other, to realize synchronous backward rotation, and the gas in extruding pump case 11, produce gas swabbing action, thus equipment is carried out evacuation operation.
Being provided with the mechanical seal 8 that screw rod is sealed between lower bearing housing 14 and pump case 11, this mechanical seal 8 can adopt the sealing structure of routine, it is possible to adopts the Patent design of I " the sealing structure of vertical screw vacuum pump ", to improve sealing property.The sealing structure that screw rod epimere is sealed it is also equipped with between top bearing housing 6 and cooling oil box 1.
This utility model is the closing inner chamber 15 being formed respectively with cylindrical shape in the helical rotor of active screw rod 9 and these two screw rods of driven screw 10, the axostylus axostyle of helical rotor upper end is hollow axis pole, the core bore of hollow axis pole is connected with the closing inner chamber 15 in helical rotor, is consequently formed the cored screw of a kind of single-ended opening.The hollow axis pole of active screw rod 9 is plugged with the first cooling oil conveying pipe 12, the hollow axis pole of driven screw 10 is plugged with the second cooling oil conveying pipe 13, the lower port of two cooling oil conveying pipes is plugged in the closing inner chamber 15 in helical rotor respectively, and is close to the bottom closing inner chamber 15；The upper end of two cooling oil conveying pipes extends to outside the upper port of hollow axis pole of two screw rods, and is fixedly attached on the top board of cooling oil box 1, in order to external cooling oil conveyer device, inputs cooling oil to the closing inner chamber 15 in the helical rotor of two screw rods.
Between the first cooling oil conveying pipe 12 and the axostylus axostyle core bore of active screw rod 9, and remain with respectively between the second cooling oil conveying pipe 13 and the axostylus axostyle core bore of driven screw 10 and cross oil-gap for cooling oil output, and do not hinder the normal high speed rotating of two screw rods.
In Fig. 1, actively the axostylus axostyle upper end of screw rod 9 and the axostylus axostyle upper end of driven screw 10 pass top bearing housing 6 respectively, and extend in cooling oil box 1, the upper port of the first cooling oil conveying pipe 12 and the upper port of the second cooling oil conveying pipe 13, respectively as cooling-oil inlet 2, are fixedly connected on the top board of cooling oil box 1.The upper port of the first cooling oil conveying pipe 12 and the upper port of the second cooling oil conveying pipe 13 are connected respectively on cooling oil fuel delivery device.Sidewall at cooling oil box 1 is provided with the cooling-oil outlet 3 of connection tank bottoms, and cooling-oil outlet 3 is connected to cooling oil fuel delivery device by pipeline, constitutes way to cycle oil.Cooling oil fuel delivery device is respectively delivered to the closing inner chamber 15 in active screw rod 9 and driven screw 10 by cooling down oil by two cooling oil conveying pipes, cooling oil is after the work calories absorbing helical rotor, along closing, inner chamber 15 is up, manage the gap with screw core up from cooling oil conveying, enter cooling oil box 1, then discharge from the cooling-oil outlet 3 cooling oil box 1 again, form circulation.Control temperature and the flow of cooling oil by cooling down oil fuel delivery device, the operating temperature rise of helical rotor on two screw rods can being controlled, thus efficiently solving the screw rod thermal expansion problem of lower cantalever screw vacuum pump, making vacuum pump be maintained even running.
This utility model can make the bottom of the straight-through cored screw of cooling oil, the place that namely temperature rise is the highest, thermal expansion is the most serious because gas is compressed, most heat taken away by cooling oil, thus having efficiently controlled temperature rise and the thermal expansion of screw rod, avoid thermal expansion uneven and produce friction or stuck phenomenon, improve lower cantalever screw vacuum pump operating stability and reliability.Owing to controlling temperature rise and the thermal expansion deformation of screw rod, so being no longer necessary to reserved bigger gap between helical rotor and helical rotor, between helical rotor and pump case, reduce gap and just can reduce gas backflow amount, which thereby enhance the speed of exhaust and the vacuum of lower cantalever screw vacuum pump.
Claims (3)
1. the cored screw structure of a lower cantalever screw vacuum pump, it is characterized in that, screw rod is formed by helical rotor and the concentric axostylus axostyle being arranged on helical rotor one end, described helical rotor is shaped with closing inner chamber, described axostylus axostyle is hollow axis pole, the closing intracavity inter-connection in the core bore of described hollow axis pole and described helical rotor；Described hollow axis pole is plugged with cooling oil conveying pipe, the lower port of described cooling oil conveying pipe is plugged in the closing inner chamber of described helical rotor, the described upper port cooling down oil conveying pipe extends to the outside of described hollow axis pole, carries to remain with between pipe and the core bore of described hollow axis pole at described cooling oil and crosses oil-gap for what cooling oil exported.
2. the cored screw structure of lower cantalever screw vacuum pump according to claim 1, is characterized in that, the upper port cross-under of described cooling oil conveying pipe is on the cooling oil box being arranged at lower cantalever screw vacuum pump top, and connects with cooling oil fuel delivery device.
3. the cored screw structure of lower cantalever screw vacuum pump according to claim 2, is characterized in that, has cooling-oil outlet on described cooling oil box, and described cooling-oil outlet is connected on cooling oil fuel delivery device by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620227302.7U CN205388012U (en) | 2016-03-23 | 2016-03-23 | Lower cantilever screw vacuum pump's hollow screw structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620227302.7U CN205388012U (en) | 2016-03-23 | 2016-03-23 | Lower cantilever screw vacuum pump's hollow screw structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205388012U true CN205388012U (en) | 2016-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620227302.7U Active CN205388012U (en) | 2016-03-23 | 2016-03-23 | Lower cantilever screw vacuum pump's hollow screw structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401956A (en) * | 2016-11-30 | 2017-02-15 | 南京妙策传媒有限公司 | Oil screw compressor based on internal cooling treatment |
| CN112012931A (en) * | 2020-09-04 | 2020-12-01 | 浙江思科瑞真空技术有限公司 | Cooling design of pump rotor |
-
2016
- 2016-03-23 CN CN201620227302.7U patent/CN205388012U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401956A (en) * | 2016-11-30 | 2017-02-15 | 南京妙策传媒有限公司 | Oil screw compressor based on internal cooling treatment |
| CN112012931A (en) * | 2020-09-04 | 2020-12-01 | 浙江思科瑞真空技术有限公司 | Cooling design of pump rotor |
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