CN217422201U - Non-contact sealing device for low-pressure rotary fluid pump - Google Patents
Non-contact sealing device for low-pressure rotary fluid pump Download PDFInfo
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- CN217422201U CN217422201U CN202221130163.8U CN202221130163U CN217422201U CN 217422201 U CN217422201 U CN 217422201U CN 202221130163 U CN202221130163 U CN 202221130163U CN 217422201 U CN217422201 U CN 217422201U
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Abstract
The utility model relates to a non-contact sealing device for a low-pressure rotary fluid pump, which comprises a sealing shell, a graphite ring and non-uniform section rectangular threads, wherein the non-uniform section rectangular threads are arranged at the near impeller end on a shaft; the sealing shell is of a split structure with an upper split and a lower split and is buckled on the shaft, the left end of the sealing shell is fixedly connected with the pump shell, the right end of the sealing shell is in clearance sealing connection with the shaft through a graphite ring, and an air inlet hole is formed in the upper half structure of the sealing shell and communicated with the compressor to form a sealing shell cavity. The beneficial effects are as follows: the utility model discloses a device under the compressed gas's combined action in non-uniform cross section rectangle screw pumping action and the sealed shell cavity, can realize the sealing of the fluid medium in the pump case under the arbitrary rotational speed, sealing device's rotatable part and static part are all not direct contact within a definite time, have realized promptly that non-contact does not have the wearing and tearing sealed, and is sealed effectual, has greatly improved life, reduces the maintenance volume, reduces cost of maintenance.
Description
Technical Field
The utility model relates to an equipment seal technical field especially relates to a non-contact sealing device for low pressure rotary fluid pump.
Background
At present, the common shaft end dynamic sealing method for the low-pressure rotary fluid pump comprises packing seal, oil seal, mechanical seal, labyrinth seal and the like, but no matter any one or combination of the packing seal, the mechanical seal and the labyrinth seal utilizes the friction between dynamic and static contact surfaces to achieve the purpose of sealing. The contact type dynamic seal is influenced by a plurality of factors such as installation precision, medium types, medium temperature, sealing material types and the like, has short service life, is easy to leak, and has large equipment maintenance amount and high maintenance cost.
SUMMERY OF THE UTILITY MODEL
For overcoming the prior art defect, the utility model provides a technical problem provides a non-contact sealing device for low pressure rotary fluid pump, under the combined action of compressed gas in non-uniform cross section rectangle screw pumping action and the sealed shell cavity, can realize the sealing of the fluid medium in the pump case under the arbitrary rotational speed, sealing device's rotatable part and static part are all not direct contact between, it is sealed to have realized non-contact non-wearing and tearing promptly, it is sealed effectual, greatly prolonged service life, reduce the maintenance volume, reduce cost of maintenance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a non-contact sealing device for a low-pressure rotary fluid pump comprises a sealing shell, a graphite ring and non-uniform-section rectangular threads, and is characterized in that the non-uniform-section rectangular threads are arranged at the end, close to an impeller, of a shaft, the depth of thread grooves of the non-uniform-section rectangular threads is gradually increased from left to right from the impeller end, the minimum value is 0, the maximum value is 0.5-1mm, the width of the thread grooves is 1.5-2mm, the thread pitch of the thread grooves is 5-15mm, and the number of thread groove heads is 1-3; the sealing shell is of a split structure with an upper split and a lower split and is buckled on the shaft, the left end of the sealing shell is fixedly connected with the pump shell, the right end of the sealing shell is in clearance sealing connection with the shaft through a graphite ring, and an air inlet hole is formed in the upper half structure of the sealing shell and communicated with the compressor to form a sealing shell cavity.
The external diameter of the non-uniform section rectangular thread is 10-20mm larger than the external diameter of the shaft.
The clearance between the external diameter of the non-uniform-section rectangular thread and the internal diameter of the sealing shell is 0.04-0.12 mm.
The number of the graphite rings is 2-4, the outer diameter of each graphite ring is 20-30mm larger than the inner diameter of each graphite ring, and the thickness of each graphite ring is 3-6 mm.
The clearance between the inner diameter of the graphite ring and the outer diameter of the shaft is 0.03-0.05 mm.
Further, the compressor injects compressed air or nitrogen into the sealed shell cavity through the air inlet, and the pressure P1 is not less than the fluid pressure P +0.1MPa in the pump shell.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the rectangular spiral groove of the non-uniform-section rectangular thread is filled with fluid (compressed air or nitrogen), when the shaft rotates, the fluid in the spiral groove generates pumping flow towards the direction of the impeller along with the rotation of the spiral groove under the action of shearing force, the spiral groove applies thrust to the fluid and performs energy exchange, the rotation kinetic energy of the shaft is converted into the pressure energy of the fluid, and therefore a sealing pressure head is formed, namely pumping action is achieved, the pumping action prevents the fluid in the pump shell from leaking outwards along a gap between the non-uniform-section rectangular thread and an inner hole of the sealing shell, and sealing is achieved;
2) under the combined action of pumping action and compressed gas (compressed air or nitrogen) introduced into a cavity of the sealing shell, the sealing of fluid media in the pump shell at any rotating speed can be realized, and a rotating part and a static part of the sealing device are not in direct contact, namely, non-contact abrasion-free sealing is realized, the sealing effect is good, the service life is greatly prolonged, the maintenance amount is reduced, and the maintenance cost is reduced;
3) the rotary shaft seal structure is simple in structure and easy to realize, can be used for sealing a rotary shaft of a low-pressure rotary fluid pump, and is particularly suitable for pumping a low-pressure rotary fluid pump with high temperature, low temperature, corrosivity or particle media.
Drawings
Fig. 1 is a schematic view of the structural principle of the present invention.
In the figure: 1-shaft 2-sealing shell 3-graphite ring 4-air inlet 5-unequal section rectangular screw 6-pump shell 7-impeller
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the utility model relates to a non-contact sealing device for low pressure rotary fluid pump, including seal shell 2, graphite ring 3 and non-uniform section rectangular screw thread 5, non-uniform section rectangular screw thread 5 sets up near impeller 7 end on axle 1, wherein the thread groove depth of non-uniform section rectangular screw thread 5 begins from impeller 7 end from left to right and increases gradually, begins minimum to be 0, and the maximum value is 0.5-1mm, and thread groove width is 1.5-2mm, and thread groove pitch is 5-15mm, and the number of thread groove heads is 1-3; the sealing shell 2 is of a split structure with an upper split and a lower split, and is buckled on the shaft 1, the left end of the sealing shell is fixedly connected with the pump shell 6, the right end of the sealing shell is in clearance sealing connection with the shaft 1 through the graphite ring 3, and the upper half structure of the sealing shell 2 is provided with an air inlet 4 communicated with the compressor to form a sealing shell cavity.
The external diameter of the non-uniform section rectangular thread 5 is 10-20mm larger than that of the shaft 1.
And the clearance between the outer diameter of the non-uniform-section rectangular thread 5 and the inner diameter of the sealing shell 2 is 0.04-0.12 mm.
The number of the graphite rings 3 is 2-4, the outer diameter of each graphite ring 3 is 20-30mm larger than the inner diameter of each graphite ring, and the thickness of each graphite ring 3 is 3-6 mm.
The clearance between the inner diameter of the graphite ring 3 and the outer diameter of the shaft 1 is 0.03-0.05 mm.
Further, the compressor injects compressed air or nitrogen into the cavity of the sealing shell 2 through the air inlet 4, and the pressure P1 is not less than the pressure P +0.1MPa of the fluid in the pump shell 6, so as to ensure that the sealing is not leaked.
When in work, the sealing principle comprises the following steps:
1) the rectangular spiral groove of the non-uniform-section rectangular thread 5 is filled with fluid (compressed air or nitrogen), when the shaft 1 rotates, the fluid in the spiral groove generates pumping flow towards the direction of the impeller 7 along with the rotation of the spiral groove under the action of shearing force, the spiral groove applies thrust to the fluid and performs energy exchange, the rotation kinetic energy of the shaft 1 is converted into pressure energy of the fluid, a sealing pressure head is formed, namely pumping action is achieved, and the pumping action prevents the fluid in the pump shell 6 from leaking outwards along a gap between the non-uniform-section rectangular thread 5 and an inner hole of the sealing shell 2, so that sealing is achieved;
2) the compressor injects compressed air or nitrogen into the cavity of the sealing shell 2 through the air inlet 4, the pressure P1 is not less than the pressure P +0.1MPa of the fluid in the pump shell 6, and the sealing of the fluid medium in the pump shell 6 at any rotating speed can be realized under the combined action of pumping and introducing compressed gas (compressed air or nitrogen) into the cavity of the sealing shell 2;
3) the clearance between the inner diameter of the graphite ring 3 and the outer diameter of the shaft 1 is 0.03-0.05mm, and the leakage of compressed air or nitrogen to the outside of the pump from the radial clearance between the inner diameter of the graphite ring 3 and the outer diameter of the shaft 1 can be reduced to the maximum extent by the extremely small clearance and an airflow field formed by the high-speed rotation of the shaft 1.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A non-contact sealing device for a low-pressure rotary fluid pump comprises a sealing shell, a graphite ring and non-uniform-section rectangular threads, and is characterized in that the non-uniform-section rectangular threads are arranged at the end, close to an impeller, of a shaft, the depth of thread grooves of the non-uniform-section rectangular threads is gradually increased from left to right from the impeller end, the minimum value is 0, the maximum value is 0.5-1mm, the width of the thread grooves is 1.5-2mm, the thread pitch of the thread grooves is 5-15mm, and the number of thread groove heads is 1-3; the sealing shell is of a split structure with an upper split and a lower split and is buckled on the shaft, the left end of the sealing shell is fixedly connected with the pump shell, the right end of the sealing shell is in clearance sealing connection with the shaft through a graphite ring, and an air inlet is arranged on the upper half structure of the sealing shell and communicated with the compressor to form a sealing shell cavity.
2. The non-contact seal device for a low pressure rotary fluid pump according to claim 1, wherein the non-uniform rectangular thread outer diameter is 10-20mm larger than the shaft outer diameter.
3. A non-contact sealing device for a low pressure rotary fluid pump according to claim 1, wherein the clearance between the outer diameter of the non-uniform rectangular thread and the inner diameter of the seal housing is 0.04-0.12 mm.
4. A non-contact seal for a low pressure rotary fluid pump according to claim 1, wherein the graphite rings are 2-4 in number, have an outer diameter 20-30mm larger than an inner diameter and a thickness 3-6 mm.
5. A non-contact seal for a low pressure rotary fluid pump according to claim 1, wherein the clearance between the inside diameter of the graphite ring and the outside diameter of the shaft is 0.03-0.05 mm.
6. The non-contact sealing device for the low-pressure rotary fluid pump according to claim 1, wherein the compressor injects compressed air or nitrogen into the sealed housing cavity through the air inlet, and the pressure P1 is equal to or greater than the fluid pressure P +0.1MPa in the pump housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221130163.8U CN217422201U (en) | 2022-05-12 | 2022-05-12 | Non-contact sealing device for low-pressure rotary fluid pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221130163.8U CN217422201U (en) | 2022-05-12 | 2022-05-12 | Non-contact sealing device for low-pressure rotary fluid pump |
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| CN217422201U true CN217422201U (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221130163.8U Active CN217422201U (en) | 2022-05-12 | 2022-05-12 | Non-contact sealing device for low-pressure rotary fluid pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114893434A (en) * | 2022-05-12 | 2022-08-12 | 鞍钢集团北京研究院有限公司 | Non-contact sealing method for low-pressure rotary fluid pump |
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2022
- 2022-05-12 CN CN202221130163.8U patent/CN217422201U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114893434A (en) * | 2022-05-12 | 2022-08-12 | 鞍钢集团北京研究院有限公司 | Non-contact sealing method for low-pressure rotary fluid pump |
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