CN211950866U - Variable-pitch screw vacuum pump cooling system - Google Patents
Variable-pitch screw vacuum pump cooling system Download PDFInfo
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- CN211950866U CN211950866U CN202020241549.0U CN202020241549U CN211950866U CN 211950866 U CN211950866 U CN 211950866U CN 202020241549 U CN202020241549 U CN 202020241549U CN 211950866 U CN211950866 U CN 211950866U
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Abstract
The utility model relates to a variable pitch screw vacuum pump cooling system belongs to vacuum pump technical field. The pump comprises a pump body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are arranged at two ends of the pump body, a pair of variable pitch screws are arranged in the pump body and fixed in the pump body, cooling water inner inlets are formed in the end parts of the variable pitch screws arranged in a rear cover cavity at uniform intervals along the radial direction, cooling water inner outlets are formed in the variable pitch end parts arranged in the front cover cavity at uniform intervals along the radial direction, and the variable pitch screws are hollow structural members so that the cooling water inner inlets are communicated with the cooling water inner outlets to form a cooling water inner channel. This application is except adopting traditional all-round outside cooling mode, increases passageway in the cooling water in the variable pitch screw rod, realizes the internal cooling of variable pitch screw rod. The temperature of the variable-pitch screw is reduced, thermal deformation is reduced, the phenomenon of thermal expansion and blocking of the variable-pitch screw is avoided, and the service life of the screw vacuum pump is prolonged.
Description
Technical Field
The utility model relates to a variable pitch screw vacuum pump cooling system belongs to vacuum pump technical field.
Background
The dry screw vacuum pump is an air pumping device which utilizes a pair of screw rotors to synchronously rotate in opposite directions at high speed in a pump shell to generate air suction and exhaust effects, and is widely applied to the fields of petroleum, chemical engineering, bio-pharmaceuticals, electronics, vacuum coating and the like.
A pair of screw rotors in the dry screw vacuum pump adopts three-section variable pitch, and the three-section pitch is smoothly connected, so that a pressure sudden change section is avoided. The gas is pre-compressed in the pump cavity, so that the surge generated at the exhaust port is inhibited, the work of the pump is more stable, and the vibration and the noise can be reduced; the theoretical pumping speed of a variable pitch screw is greater for the same overall length of the screw. However, because the compression ratio of the screw vacuum pump is large, the local temperature rise of the screw rod at one side close to the exhaust end is above 250 ℃, and if an effective cooling mode is not adopted, the internal temperature of the screw vacuum pump is high, so that various quality problems such as jamming, oil leakage, overload and the like of the screw vacuum pump can occur. High temperatures are extremely disadvantageous and undesirable for normal use of screw vacuum pumps. At present, the conventional cooling mode of domestic and domestic screw vacuum pumps is realized by adding a spacer sleeve cooling mode in a pump body and an end cover, the mode cannot completely solve the high temperature rise of the screw vacuum pump, and the heating source of the screw vacuum pump is a screw rotor, which is a temporary solution and a permanent solution. Because the screw vacuum pump is basically in a vacuum state when in work, the inside of the pump cavity is lack of air convection, and the cooling of the shell can only cool the pump body and the end cover but can not effectively cool the screw rotor inside the pump cavity. When the screw vacuum pump is used in some processes, pumped media are easy to condense and scorch on the surface of a screw rotor after encountering the screw rotor with high temperature. Because the clearance between the screw rotor and the inner hole of the pump cavity is very small, the screw vacuum pump runs for a certain time and then continuously accumulates along with the scorching objects on the surface of the screw rotor, and finally the screw rotor is stuck in the pump cavity, so that the screw vacuum pump cannot be normally used.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a variable pitch screw vacuum pump cooling system is provided to above-mentioned prior art, carries out the internal cooling to the screw rotor, and the high temperature of solving the screw rotor rises, is taken out the medium and is difficult for condensing in the screw rotor surface, has avoided the screw rotor dead phenomenon of card that rises to appear heat.
The utility model provides a technical scheme that above-mentioned problem adopted does: the utility model provides a variable pitch screw vacuum pump cooling system, includes the pump body, front end housing and rear end cap, pump body both ends set up front end housing and rear end cap, be equipped with a pair of variable pitch screw rod in the pump body: a driving variable pitch screw and a driven variable pitch screw; the two ends of the variable pitch screw are respectively arranged in a front cover cavity and a rear cover cavity, the two ends of the variable pitch screw are respectively fixed in the pump body through a bearing seat, the front end cover is fixedly connected with the gear box, and a pair of mutually meshed helical gears are arranged in the gear box: the driving bevel gear is arranged on the driving variable pitch screw rod, the driven bevel gear is arranged on the driven variable pitch screw rod, and the driving variable pitch screw rod is connected with an output shaft of the motor through a coupler; the rear end cover is provided with a cooling water outer inlet, the front end cover is provided with a cooling water outer outlet, and cooling water flows into a cooling water cavity of the pump body through the cooling water outer inlet to form a cooling water outer channel; the end part of the variable-pitch screw rod arranged in the rear cover cavity is provided with cooling water inner inlets at uniform intervals along the radial direction, the end part of the variable-pitch screw rod arranged in the front cover cavity is provided with cooling water inner outlets at uniform intervals along the radial direction, and the variable-pitch screw rod is a hollow structural member, so that the cooling water inner inlets are communicated with the cooling water inner outlets to form a cooling water inner channel; the cooling water enters the pump body from the cooling water outer inlet and then flows into the cooling water inner channel from the cooling water inner inlet, so that the cooling water cools the variable-pitch screw, and the cooling water after heat exchange flows to the pump body from the cooling water outer outlet through the cooling water inner outlet and flows out.
The variable-pitch screw comprises a first pitch area, a second pitch area and a third pitch area, the first pitch area is matched with an air inlet of the pump body, the third pitch area is matched with an air outlet of the pump body, the tail end of the first pitch area is connected with the starting end of the third pitch area through the second pitch area, and the pitch of the variable-pitch screw gradually decreases from the starting end of the first pitch area to the ending end of the second pitch area; the screw pitch of the second screw pitch area gradually decreases from the starting end of the second screw pitch area to the tail end of the third screw pitch area.
The pitch of second pitch district diminishes gradually, and the pitch of the initial end is the same with the pitch of first pitch district in second pitch district, the pitch of the end is the same with the pitch of third pitch district in second pitch district.
And the shaft holes formed at the two ends of the variable-pitch screw rod along the axial direction are sealed by screw plugs.
Compared with the prior art, the utility model has the advantages of: a cooling system of a variable-pitch screw vacuum pump is characterized in that a cooling water inner channel is arranged in a variable-pitch screw rotor transmission shaft except for a traditional omnibearing external cooling mode, and internal cooling of a variable-pitch screw is achieved. The temperature of the variable-pitch screw is reduced, thermal deformation is reduced, the phenomenon of thermal expansion and blocking of the variable-pitch screw is avoided, and the service life of the screw vacuum pump is prolonged.
Drawings
FIG. 1 is a schematic view of a cooling system of a variable pitch screw vacuum pump according to an embodiment of the present invention;
FIG. 2 is a front view of a variable pitch screw vacuum pump cooling system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a pair of variable pitch screws;
in the figure, 1 a pump body, 2 rear end covers, 3 front end covers, 4 bearing seats, 5 bearings, 6 driving variable pitch screws, 7 driven variable pitch screws, 8 gear boxes, 9 driving bevel gears, 10 driven bevel gears, 11 couplers, 12 motors, 13 cooling water external inlets, 14 cooling water external outlets, 15 cooling water internal inlets, 16 cooling water internal outlets, a first pitch area, b second pitch areas and c third pitch areas.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, 2, and 3, the cooling system of a variable-pitch screw vacuum pump in this embodiment includes a pump body 1, a front end cover 3, and a rear end cover 2, where the front end cover 3 and the rear end cover 2 are disposed at two ends of the pump body 1, and a pair of variable-pitch screws is disposed in the pump body 1: a driving variable pitch screw 6 and a driven variable pitch screw 7; two ends of the pair of variable pitch screws are respectively arranged in the front cover cavity and the rear cover cavity, and two ends of the variable pitch screws are respectively fixed in a bearing 5 of the pump body 1 through a bearing seat 4. Front end housing 3 and 8 fixed connection of gear box are equipped with a pair of intermeshing's helical gear in the gear box 8: the driving bevel gear 9 is fixed on the driving variable pitch screw 6, the driven bevel gear 10 is fixed on the driven variable pitch screw 7, and the driving variable pitch screw 9 is connected with an output shaft of a motor 12 through a coupler 11; the driving helical gear 9 is driven to rotate by the driving variable pitch screw 6 driven by the motor 12, the driven helical gear 10 is driven to rotate by the driving helical gear 9, the pair of variable pitch screws are driven by the pair of mutually meshed helical gears to rotate in the same direction and in the opposite direction, and the high vacuum is formed at the air suction port of the screw vacuum pump by continuously sucking, compressing and discharging the pumped object. And a cooling water outer inlet 13 is formed in the rear end cover 2, a cooling water outer outlet 14 is formed in the front end cover 3, and cooling water flows into the cooling water cavity of the pump body 1 through the cooling water outer inlet 13, so that the pump body 1, the front end cover 3 and the rear end cover 2 are cooled by the cooling water. The end part of the variable-pitch screw rod positioned in the rear cover cavity is provided with 4 cooling water inner inlets 15 at uniform intervals along the radial direction, the end part of the variable-pitch screw rod positioned in the front cover cavity is provided with 4 cooling water inner outlets 16 at uniform intervals along the radial direction, the variable-pitch screw rods are hollow structural members, and shaft holes formed at two ends of the variable-pitch screw rod along the axial direction are sealed by screw plugs, so that the cooling water inner inlets 15 are communicated with the cooling water inner outlets 16 to form a cooling water inner channel. The cooling water in the cooling water compartment flows into the cooling water inner channel from the cooling water inner inlet 15, so that the cooling water cools the variable-pitch screw, and the cooling water after heat exchange flows to the cooling water compartment through the cooling water inner outlet 16 and then flows out from the cooling water outer outlet 14.
The variable-pitch screw comprises a first pitch area a, a second pitch area b and a third pitch area c which are sequentially arranged, the first pitch area a is matched with an air inlet of the pump body, the third pitch area c is matched with an air outlet of the pump body, the tail end of the first pitch area a is connected with the starting end of the third pitch area c through the second pitch area b, and the pitch of the variable-pitch screw gradually decreases from the starting end of the first pitch area a to the ending end of the second pitch area b; the pitch of the second pitch region b gradually decreases from the start end to the end of the third pitch region c.
The second pitch zone b rotor is a parabola formed by a plurality of different pitches, and the pitch of the second pitch zone b is gradually reduced. The screw pitch of the initial end of the second screw pitch area b is the same as that of the first screw pitch area a, so that the terminal end of the first screw pitch area a is smoothly connected with the initial end of the second screw pitch area b, the screw pitch of the terminal end of the second screw pitch area b is the same as that of the third screw pitch area c, the terminal end of the second screw pitch area b is smoothly connected with the initial end of the third screw pitch area c, and a pressure sudden change section is avoided. The structure leads the air to be pre-compressed in the pump cavity, thereby having the function of inhibiting the surge generated at the exhaust port, leading the work of the pump to be more stable and reducing the vibration and the noise; the theoretical pumping speed of a variable pitch screw is greater for the same overall length of the screw.
This application is except adopting traditional all-round outside cooling mode, sets up passageway in the cooling water in the variable pitch screw rotor transmission shaft, realizes the internal cooling of variable pitch screw rod. After the variable pitch screw is additionally provided with the internal cooling structure, the maximum temperature in the pump body of the screw vacuum pump can be reduced from 140 ℃ to about 70 ℃, and the maximum temperature on the surface of the variable pitch screw is reduced from 250 ℃ to below 90 ℃. The overall temperature drop of the screw vacuum pump is particularly important for the service life of the internal parts of the screw vacuum pump, particularly for the seals such as mechanical seals and lip seals, and for the transmission parts such as bevel gears and bearings. The temperature of the surface of the variable-pitch screw and the inner surface of the pump body is reduced, so that the thermal deformation is reduced, particularly, the variable-pitch screw cannot be thermally expanded and stuck, and in addition, the pumped medium is not easy to condense in the pump cavity and cannot be sintered, so that the service life of the screw vacuum pump is prolonged.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (4)
1. The utility model provides a variable pitch screw vacuum pump cooling system, includes the pump body, front end housing and rear end cap, pump body both ends set up front end housing and rear end cap, be equipped with a pair of variable pitch screw rod in the pump body: a driving variable pitch screw and a driven variable pitch screw; the two ends of the variable pitch screw are respectively arranged in a front cover cavity and a rear cover cavity, the two ends of the variable pitch screw are respectively fixed in the pump body through a bearing seat, the front end cover is fixedly connected with the gear box, and a pair of mutually meshed helical gears are arranged in the gear box: the driving bevel gear is arranged on the driving variable pitch screw rod, the driven bevel gear is arranged on the driven variable pitch screw rod, and the driving variable pitch screw rod is connected with an output shaft of the motor through a coupler; the rear end cover is provided with a cooling water outer inlet, the front end cover is provided with a cooling water outer outlet, and cooling water flows into a cooling water cavity of the pump body through the cooling water outer inlet to form a cooling water outer channel; the method is characterized in that: the end part of the variable-pitch screw rod arranged in the rear cover cavity is provided with cooling water inner inlets at uniform intervals along the radial direction, the end part of the variable-pitch screw rod arranged in the front cover cavity is provided with cooling water inner outlets at uniform intervals along the radial direction, and the variable-pitch screw rod is a hollow structural member, so that the cooling water inner inlets are communicated with the cooling water inner outlets to form a cooling water inner channel; the cooling water enters the pump body from the cooling water outer inlet and then flows into the cooling water inner channel from the cooling water inner inlet, so that the cooling water cools the variable-pitch screw, and the cooling water after heat exchange flows to the pump body from the cooling water outer outlet through the cooling water inner outlet and flows out.
2. A variable pitch screw vacuum pump cooling system as defined in claim 1, wherein: the variable-pitch screw comprises a first pitch area, a second pitch area and a third pitch area, the first pitch area is matched with an air inlet of the pump body, the third pitch area is matched with an air outlet of the pump body, the tail end of the first pitch area is connected with the starting end of the third pitch area through the second pitch area, and the pitch of the variable-pitch screw gradually decreases from the starting end of the first pitch area to the ending end of the second pitch area; the screw pitch of the second screw pitch area gradually decreases from the starting end of the second screw pitch area to the tail end of the third screw pitch area.
3. A variable pitch screw vacuum pump cooling system as claimed in claim 2, wherein: the pitch of second pitch district diminishes gradually, and the pitch of the initial end is the same with the pitch of first pitch district in second pitch district, the pitch of the end is the same with the pitch of third pitch district in second pitch district.
4. A variable pitch screw vacuum pump cooling system as defined in claim 1, wherein: and the shaft holes formed at the two ends of the variable-pitch screw rod along the axial direction are sealed by screw plugs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020241549.0U CN211950866U (en) | 2020-03-02 | 2020-03-02 | Variable-pitch screw vacuum pump cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020241549.0U CN211950866U (en) | 2020-03-02 | 2020-03-02 | Variable-pitch screw vacuum pump cooling system |
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| Publication Number | Publication Date |
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| CN211950866U true CN211950866U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020241549.0U Active CN211950866U (en) | 2020-03-02 | 2020-03-02 | Variable-pitch screw vacuum pump cooling system |
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| CN (1) | CN211950866U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052662A (en) * | 2023-08-17 | 2023-11-14 | 威鹏晟(山东)机械有限公司 | External balance type screw vacuum pump |
-
2020
- 2020-03-02 CN CN202020241549.0U patent/CN211950866U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052662A (en) * | 2023-08-17 | 2023-11-14 | 威鹏晟(山东)机械有限公司 | External balance type screw vacuum pump |
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