CN215333590U - Power and gas composite sealing device - Google Patents
Power and gas composite sealing device Download PDFInfo
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- CN215333590U CN215333590U CN202120594223.0U CN202120594223U CN215333590U CN 215333590 U CN215333590 U CN 215333590U CN 202120594223 U CN202120594223 U CN 202120594223U CN 215333590 U CN215333590 U CN 215333590U
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Abstract
The application relates to a power and gas composite sealing device, which comprises a pump shell, an impeller, a pump cover and a sealing shell; the sealing shell comprises a sealing cylinder body and a cylinder body bottom positioned at one end of the sealing cylinder body, a pump shell is arranged at the other end of the sealing cylinder body, a pump cover is arranged at the other end of the sealing cylinder body, a cavity is formed between the pump cover and the pump shell, a through hole is formed in the pump cover, a pump shaft penetrates through the cylinder body bottom and the through hole and extends into the cavity, an impeller is arranged at one end, close to the pump shell, of the pump shaft, and an impeller back blade is arranged on one surface, close to the pump cover, of the impeller; a gas sealing cavity is formed in the sealing cylinder, a gas interface is arranged at the bottom of the cylinder, and inert gas is introduced into the gas sealing cavity through the gas interface. This application is dynamic effect with power seal and gas seal combination, when the pump operation with the parking, utilizes the effect of the sealed reduction backpressure of power and gaseous compressible characteristic, with the fluid seal that the pump was carried in gas seal chamber lower part, guarantees that the fluid can not leak up and harm other parts on gas seal chamber upper portion.
Description
Technical Field
The application relates to the technical field of fluid medium conveying and sealing, in particular to a power and gas composite sealing device.
Background
In the aspect of fluid medium transportation, especially in the aspect related to the petrochemical industry, many petrochemical raw materials, finished products or semi-finished products are in a fluid state, and generally have high-risk characteristics such as flammability, explosiveness, toxicity, strong corrosion and the like, and if leakage occurs in the transportation process, safety accidents and environmental pollution are easily caused, so that the high-risk fluid is extremely reliable in sealing requirement in the transportation process and cannot be neglected.
In general, fluid media are delivered by using a pump, the seal of the pump is usually mechanical seal, dry gas seal, dynamic seal and the like, and in addition, a magnetic pump and a canned motor pump in the form of shaft seal or not are available, but the mechanical seal cannot guarantee absolute seal; the shaft seal-free pump cannot convey solid particles, gas and strong corrosive media due to the bearings, the shielding sleeve and the isolating sleeve; the dynamic seal and the dry gas seal are both movable seals, the seals are effective in the operation process, and the parking seal is required to be configured when the vehicle is parked, so that the seals are more reliable than mechanical seals, but the structures are complex, and the maintenance and the overhaul are inconvenient.
Since the petrochemical industry is indispensable in daily life and industrial production, and the requirements for safe production and environmental protection of the petrochemical industry are higher and higher in recent years, the sealing performance of fluid conveying equipment in the petrochemical industry is also correspondingly improved. Therefore, it is necessary to design a sealing manner, so that the sealing manner has better sealing performance, preferably absolute sealing performance, is relatively easy to implement, is suitable for various complex and high-hazard fluids, has a relatively simple structure, and is relatively convenient to maintain and overhaul.
SUMMERY OF THE UTILITY MODEL
The application provides a sealing performance does, simple structure and be convenient for maintain the power and the gaseous compound sealing device who overhauls.
The technical scheme adopted by the application is as follows:
the utility model provides a power and gas composite sealing device, which comprises a pump shell, an impeller, a pump cover and a sealing shell, wherein the impeller is arranged on the pump shell; the pump cover is detachably arranged at the other end of the sealing cylinder body, a cavity is formed between the pump cover and the pump shell, a through hole is formed in the pump cover, the pump shaft sequentially penetrates through the bottom of the cylinder body and the through hole and extends into the cavity, an impeller is arranged at the end part, close to the pump shell, of the pump shaft, an impeller back blade is arranged on one surface, close to the pump cover, of the impeller, and the impeller back blade are located in the cavity; a gas sealing cavity is formed in the sealing cylinder, a gas interface is arranged at the bottom of the cylinder and communicated with the gas sealing cavity, and inert gas is introduced into the gas sealing cavity through the gas interface.
Further, the inert gas is nitrogen.
Furthermore, an auxiliary sealing ring is arranged between the bottom of the cylinder body and the pump shaft.
Further, the pump casing is disposed at the other end of the seal cylinder by a first bolt thread.
Further, a sealing gasket is arranged at the joint of the pump shell and the sealing cylinder body.
Further, the pump cover is arranged at the other end of the sealing cylinder body through a second bolt thread.
Furthermore, the sealing cylinder body is provided with an exhaust port communicated with the gas sealing cavity.
Furthermore, the pump shell is provided with a liquid inlet and a liquid outlet which are communicated with the cavity.
The technical scheme of the application has the following beneficial effects:
the dynamic composite action and composite structure sealing device provided by the embodiment of the utility model has the following technical advantages and characteristics:
1. the structure is simple, the production and the processing are convenient, and reliable and effective sealing can be formed only by adding back blades on the impeller, arranging a gas interface on the bottom of the cylinder and introducing inert gas into the gas sealing cavity through the gas interface;
2. the sealing function is a dynamic composite function, when the gas interface is opened, the pressure of the gas sealing cavity can dynamically change along with the pressure of the back of the impeller, meanwhile, when the pump runs, the sealing effect depends on the effect of reducing the pressure of the back of the impeller by the dynamic seal and the pressure of the gas in the gas sealing cavity, and the pressure of the gas in the gas sealing cavity dynamically follows the pressure of the back of the impeller when the pump runs;
3. the sealing structure is a composite structure, and the power seal and the gas seal are combined together through a simple device, so that the sealing structure can play a role in sealing together, and the sealing effect is improved. In actual use, the two components act together to form a whole, and one of the components is not necessary;
4. because the conveying medium cannot reach the parts above the gas sealing cavity, the use requirements of materials can be reduced when the parts are selected, and the material cost of the pump can be effectively saved.
Unlike dynamic seals, the composite seal provided by the present invention does not rely entirely on dynamic seals when the pump is running, nor does the gas seal function only when the pump is shut down.
The composite seal provided by the utility model is mainly used for sealing by utilizing the principle that the pressure changes along with the volume change in the isothermal process of gas, and is different from other gas seals, and no contact seal is generated in the seal.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a hybrid power and gas seal according to an embodiment of the present invention;
illustration of the drawings:
wherein, 1-pump shell; 2-an impeller; 3-impeller back blades; 4-pump cover; 5-sealing the cylinder; 6-auxiliary sealing ring; 7-gas interface; 8-a pump shaft; 9-gas seal chamber.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of a power and gas combined sealing device is shown.
The application provides a power and gaseous compound sealing device, including pump case 1, impeller 2, pump cover 4 and seal shell.
Specifically, the sealing shell comprises a sealing cylinder 5 and a cylinder bottom positioned at one end of the sealing cylinder 5, the pump shell 1 is detachably arranged at the other end of the sealing cylinder 5, the pump cover 4 is detachably arranged at the other end of the sealing cylinder 5, a cavity is formed between the pump cover 4 and the pump shell 1, a through hole is formed in the pump cover 4, the pump shaft 8 sequentially penetrates through the cylinder bottom and the through hole to extend into the cavity, an impeller 2 is arranged at one end part of the pump shaft 8 close to the pump shell 1, an impeller back blade 3 is arranged at one side of the impeller 2 close to the pump cover 4, and the impeller 2 and the impeller back blade 3 are positioned in the cavity;
a gas sealing cavity 9 is formed in the sealing cylinder body 5, a gas interface 7 is arranged at the bottom of the cylinder body, the gas interface 7 is communicated with the gas sealing cavity 9, and inert gas is introduced into the gas sealing cavity 9 through the gas interface 7.
In an implementation manner, the inert gas is nitrogen, and may also be other inert gases such as carbon dioxide, helium, and the like, which is not described in detail herein. Wherein, the inert gas supply switch is in a normally open state.
In an achievable manner, an auxiliary sealing ring 6 is provided between the bottom of the cylinder and the pump shaft 8, which can serve as an emergency protective seal in the event of special emergencies such as a sudden interruption in the nitrogen supply or a sudden increase in the pump inlet pressure.
In an implementable manner, the pump casing 1 is provided at the other end of the seal cylinder 5 by means of a first bolt thread.
In an achievable manner, the connection of the pump housing 1 to the seal cylinder 5 is provided with a seal which prevents liquid or gas from leaking.
In an implementable manner, the pump cap 4 is provided at the other end of the seal cylinder 5 by means of a second bolt thread.
In a practical form, the sealing cylinder 5 is provided with a gas outlet communicated with the gas sealing cavity 9.
In a realizable manner, the pump shell 1 is provided with a liquid inlet and a liquid outlet which are communicated with the cavity, the liquid inlet is arranged at the bottom of the pump shell 1, and the liquid outlet is arranged at the left side of the pump shell 1.
Wherein, the inside of the gas seal chamber 9 has a larger volume, the volume of the gas seal chamber 9 should be larger than the cavity volume formed by all the parts (the bottom of the cylinder) on the upper part of the gas seal chamber 9, and when the gas seal chamber 9 is filled with inert gas, all the parts on the upper part of the gas seal chamber 9 can not contact with the fluid conveyed in the cavity.
The gas sealing device comprises a power seal and a gas seal, wherein a gas interface 7 is arranged at the upper end (the bottom of a cylinder body) of a sealing shell, and the gas interface 7 can introduce inert gas into a gas sealing cavity 9 to form gas seal so as to prevent fluid in the cavity from entering the upper end of the sealing shell; when the pump is closed, the power seal fails, liquid at the inlet of the pump flows to the back of the impeller, gas in the gas seal cavity 9 is compressed by the liquid until the pressure of the liquid and the gas is balanced, the rotation of the impeller back blade 3 effectively prevents the fluid in the cavity from flowing to the gas seal cavity 9, and the power seal can effectively reduce the pressure at the back of the impeller. Two kinds of sealed dynamic coordination of gas seal and power seal, utilize the power seal to reduce the pressure of 2 backs of impeller, then utilize gaseous compressibility to come balance impeller back pressure, with liquid level control in the pump at a take the altitude, can ensure that 9 upper portion spare parts of gas seal chamber do not contact liquid to reach the effect of sealing and the interior key spare part of protection pump, gas seal and power seal combined action, and then make the sealing ability stronger, the effect is better. Meanwhile, the sealing property of the pump during conveying various strong corrosive and dangerous media can be effectively improved, and the production and operation cost of the pump is reduced.
The embodiment is mainly used for conveying high-hazard fluid media in the petrochemical industry, and is mainly used for a vertical pump, compared with the prior sealing technology, the dynamic sealing and the gas sealing are mainly combined together and have combined action, dynamic action is realized during the operation and the stop of the pump, the action of reducing back pressure of the dynamic sealing and the compressible characteristic of gas are utilized, the fluid conveyed by the pump is sealed at the lower part of the gas sealing cavity 9, and the fluid is ensured not to leak upwards and harm other parts on the upper part of the gas sealing cavity 9.
When the pump is stopped, the power seal fails, the pressure at the back of the impeller is suddenly increased due to the liquid inlet pressure of the pump and the liquid outlet fluid backflow, at the moment, the conveying fluid enters the gas seal cavity 9 to compress the seal gas, the isothermal process is known from gas theory knowledge, the volume of the seal gas is reduced and the pressure is increased in the process, when the pressure between the inert gas and the conveying fluid is equal, the volume of the gas seal chamber 9 is far larger than the volume of the cavity formed by all the parts on the upper part of the gas seal chamber 9, and when the ratio of the volume of the gas seal chamber 9 to the volume of the cavity formed by all the parts on the upper part of the gas seal chamber 9 is larger than the ratio of the pressure of the conveying fluid to the pressure of the gas in the gas seal chamber 9 when the vehicle is stopped, the conveying fluid can not cross the gas seal chamber 9.
Specifically, when the pump is used, the pump shaft 8 drives the impeller 2 to rotate, the dynamic seal formed by the impeller back blades 3 and the pump cover 4 is effective, the pressure at the back of the impeller 2 is reduced, meanwhile, the pressure of the gas in the gas seal cavity 9 is gradually changed to be equal to the pressure at the back of the impeller 2 due to the isothermal process of the gas, and the fluid medium conveyed by the pump is sealed at the back of the impeller 2. When the pump stops, the pump shaft 8 and the impeller 2 stop rotating, and the pump conveying fluid flows upwards to cross the impeller 2 due to the backflow of a pump outlet pipeline and the pressure at an inlet, so that the gas inside the gas seal cavity 9 is compressed, and the volume of the cavity inside the gas seal cavity 9 is far larger than the volume of the cavity formed by all parts on the upper part of the gas seal cavity 9, so that the fluid cannot reach the parts above the gas seal cavity 9 when the ratio of the pressure of the conveying fluid to the gas pressure is smaller than the volume of the cavity inside the gas seal cavity 9 and the volume of the cavity formed by all parts on the upper part of the gas seal cavity 9 according to the principle of the isothermal process. And the auxiliary seal 6 is arranged, so that protection can be provided when the water hammer or inlet pressure surge occurs to the pump and the pipeline thereof, and the sealing safety is ensured.
The dynamic composite action and composite structure sealing provided by the embodiment of the utility model has the following advantages and characteristics in the technical field:
1. the structure is simple, the production and the processing are convenient, and reliable and effective sealing can be formed only by adding back blades on the impeller, arranging a gas interface on the bottom of the cylinder and introducing inert gas into the gas sealing cavity 9 through the gas interface 7;
2. the sealing function is a dynamic composite function, when the gas interface is opened, the pressure of the gas sealing cavity 9 can dynamically change along with the pressure at the back of the impeller 2, meanwhile, when the pump runs, the sealing effect depends on the effect of reducing the pressure at the back of the impeller by dynamic sealing and the pressure of gas in the gas sealing cavity 9, and the pressure of the gas in the gas sealing cavity 9 dynamically follows the pressure at the back of the impeller when the pump runs;
3. the sealing structure is a composite structure, and the power seal and the gas seal are combined together through a simple device, so that the sealing structure can play a role in sealing together, and the sealing effect is improved. In actual use, the two components act together to form a whole, and one of the components is not necessary;
4. because the conveying medium cannot reach the parts above the gas sealing cavity 9, the use requirements of materials can be reduced when the parts are selected, and the material cost of the pump can be effectively saved.
Unlike dynamic seals, the composite seal provided by the present invention does not rely entirely on dynamic seals when the pump is running, nor does the gas seal function only when the pump is shut down.
The composite seal provided by the utility model is mainly used for sealing by utilizing the principle that the pressure changes along with the volume change in the isothermal process of gas, and is different from other gas seals, and no contact seal is generated in the seal.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (8)
1. A power and gas composite sealing device is characterized by comprising a pump shell (1), an impeller (2), a pump cover (4) and a sealing shell;
the sealing shell comprises a sealing cylinder body (5) and a cylinder body bottom positioned at one end of the sealing cylinder body (5), the pump shell (1) is detachably arranged at the other end of the sealing cylinder body (5), the pump cover (4) is detachably arranged at the other end of the sealing cylinder body (5), a cavity is formed between the pump cover (4) and the pump shell (1), a through hole is formed in the pump cover (4), a pump shaft (8) sequentially penetrates through the cylinder body bottom and the through hole and extends into the cavity, an impeller (2) is arranged at the end part, close to the pump shell (1), of the pump shaft (8), one surface, close to the pump cover (4), of the impeller (2) is provided with an impeller back blade (3), and the impeller (2) and the impeller back blade (3) are positioned in the cavity;
a gas seal cavity is formed in the seal cylinder body (5), a gas interface (7) is arranged at the bottom of the cylinder body, the gas interface (7) is communicated with the gas seal cavity, and inert gas is introduced into the gas seal cavity.
2. The power and gas composite seal of claim 1, wherein said inert gas is nitrogen.
3. The power and gas composite seal according to claim 1, characterized in that an auxiliary seal ring (6) is provided between the bottom of the canister and the pump shaft (8).
4. The power and gas composite seal according to claim 1, wherein the pump housing (1) is provided at the other end of the seal cylinder (5) by a first bolt thread.
5. The power and gas composite sealing device according to claim 4, characterized in that a sealing gasket is arranged at the joint of the pump shell (1) and the sealing cylinder (5).
6. The power and gas composite sealing device according to claim 1, wherein the pump cover (4) is disposed at the other end of the sealing cylinder (5) by a second bolt thread.
7. The power and gas combined sealing device according to any one of claims 1 to 6, wherein the sealing cylinder (5) is provided with a gas outlet communicated with the gas sealing cavity.
8. The power and gas combined sealing device according to claim 1, wherein the pump housing (1) is provided with a liquid inlet and a liquid outlet which are communicated with the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594223.0U CN215333590U (en) | 2021-03-23 | 2021-03-23 | Power and gas composite sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594223.0U CN215333590U (en) | 2021-03-23 | 2021-03-23 | Power and gas composite sealing device |
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| Publication Number | Publication Date |
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| CN215333590U true CN215333590U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120594223.0U Active CN215333590U (en) | 2021-03-23 | 2021-03-23 | Power and gas composite sealing device |
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| CN (1) | CN215333590U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412800A (en) * | 2022-01-20 | 2022-04-29 | 宜兴市宙斯泵业有限公司 | Vertical side suction type centrifugal pump |
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2021
- 2021-03-23 CN CN202120594223.0U patent/CN215333590U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412800A (en) * | 2022-01-20 | 2022-04-29 | 宜兴市宙斯泵业有限公司 | Vertical side suction type centrifugal pump |
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