Combined sealing structure of high-temperature submerged pump

Abstract

The utility model relates to a combined sealing structure of a high-temperature submerged pump. The combined sealing structure comprises a shaft, a protective pipe, a flange, a key, a bottom plate, a metal wound gasket, a packing body, a packing shaft sleeve, a packing gland, copper packing, a purging opening, a packing ring, an annular sealing groove and a liquid throwing disc. The protective pipe is connected with the bottom plate through a flange, the packing body and the bottom plate are sealed by a metal wound gasket and are connected through a bolt, and the packing shaft is sleeved on the shaft and is prevented from rotating through key connection; the liquid throwing disc is arranged between the shaft and the packing shaft sleeve, and an annular sealing groove structure is arranged on the face, making contact with the packing shaft sleeve, of the packing body. The liquid throwing disc is additionally arranged between the shaft and the packing shaft sleeve, and a high-temperature medium is thrown away from the liquid throwing disc under the action of centrifugal force, falls on the inner wall of the protective pipe and flows into a medium below the protective pipe. And the impact of a high-temperature medium on a sealing part is reduced. Due to the design that the annular sealing groove is additionally arranged on the packing body, pressure of gas is reduced step by step when the gas passes through the annular sealing groove, sealing reliability of the pump is improved, and safe and stable operation of a unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to a sealing structure, in particular to a combined sealing structure of a high-temperature submerged pump that reduces the impact of high-temperature media on the sealing part and improves the sealing reliability of the pump. Background Art

[0002] High-temperature submerged pumps are specifically used for transporting various high-temperature media under high-temperature working conditions, such as various high-temperature molten salts, liquid metals, etc. The temperature of such media can reach up to 600°C at the highest, and some high-temperature media have certain corrosiveness and toxicity.

[0003] Due to its special operating conditions involving high-temperature media, the shaft seal adopts packing seal + nitrogen purging to achieve the sealing of high-temperature media, prevent the upward transfer of high temperature, and ensure the safe and stable operation of the pump.

[0004] The existing sealing structure of high-temperature submerged pumps mainly includes: shaft 1', protection tube 2', flange 3', key 4', bottom plate 5', metal wound gasket 6', packing body 7', packing shaft sleeve 8', packing gland 9', copper packing 10', purging port 11', packing ring 12'. The protection tube 2' and the bottom plate 5' are connected by the flange 3'. The packing body 7' is sealed with the bottom plate 5' by the metal wound gasket 6' and connected by bolts. The packing shaft sleeve 8' is installed on the shaft 1' and connected by the key 4' to prevent it from rotating. The packing ring 12' and the copper packing 10' are sequentially installed in the inner cavity of the packing body 7', and are tightened by the packing gland 9' to prevent the leakage of high-temperature media.

[0005] From Figure 1 It can be seen that since the protection tube 2' is filled with pressurized high-temperature media, the shaft 1' is in direct contact with the high-temperature media. There is a very small gap between the inner hole of the packing body 7' and the packing shaft sleeve 8' to block the pressurized high-temperature media. Nitrogen is blown in through the purging port 11' above to block the high-temperature media, and three plates of copper packing 10' are provided above for sealing. However, due to the direct action of the high-temperature media in the protection tube 2' on the sealing part, there is a pressure difference between the shaft seal part and the atmosphere side, which makes it difficult to seal. Even though the media can be sealed by the above method, the sealing reliability is low, there is a risk of leakage of high-temperature media, and the potential risk is relatively large. Summary of the Utility Model

[0006] Aiming at the above problems, the main purpose of the present utility model is to provide a combined sealing structure of a high-temperature submerged pump that reduces the impact of high-temperature media on the sealing part and improves the sealing reliability of the pump.

[0007] The present utility model solves the above technical problems through the following solution: a combined seal structure for a high-temperature submerged pump, the combined seal structure of the high-temperature submerged pump comprising: a shaft, a protective tube, a flange, a key, a bottom plate, a wound metal gasket, a stuffing box body, a stuffing shaft sleeve, a stuffing gland, copper packing, a purge port, a packing ring, an annular seal groove, and a liquid slinger; the protective tube is connected to the bottom plate through the flange, the stuffing box body and the bottom plate are sealed with a wound metal gasket and connected with bolts, the stuffing shaft sleeve is sleeved on the shaft and connected with the key to prevent it from rotating, the inner cavity of the stuffing box body is sequentially filled with the packing ring and copper packing, and the packing gland presses them tightly.

[0008] The liquid slinger is located between the shaft and the stuffing shaft sleeve, the liquid slinger and the stuffing shaft sleeve are connected with the same key, and the liquid slinger rotates following the shaft; an annular seal groove structure is arranged on the surface of the stuffing box body in contact with the stuffing shaft sleeve, and a purge port for introducing nitrogen is connected at the packing ring; three plates of copper packing are arranged above the purge port for sealing.

[0009] In a specific embodiment of the present utility model, the annular seal groove includes a gap and an annular cavity, and the gap and the annular cavity are communicated with each other.

[0010] In a specific embodiment of the present utility model, both the annular cavity and the gap include multiple groups, and the gap and the annular cavity are arranged at intervals.

[0011] In a specific embodiment of the present utility model, the three plates of copper packing are arranged in an upper, middle, and lower position manner.

[0012] In a specific embodiment of the present utility model, the overall height range of the liquid slinger is: 2 - 5 cm.

[0013] In a specific embodiment of the present utility model, the liquid slinger includes a fixed inner ring and a liquid-slinging outer ring, and the fixed inner ring is sleeved on the shaft.

[0014] In a specific embodiment of the present utility model, the fixed inner ring and the liquid-slinging outer ring are integrally formed.

[0015] In a specific embodiment of the present utility model, the outer diameter of the fixed inner ring is equal to the outer diameter of the stuffing shaft sleeve.

[0016] In a specific embodiment of the present utility model, the liquid-slinging outer ring is a liquid-slinging outer ring with a thick middle and a thin edge.

[0017] In a specific embodiment of the present utility model, the surface of the liquid-slinging outer ring close to the stuffing shaft sleeve is a plane, and the surface of the liquid-slinging outer ring far from the stuffing shaft sleeve is a wedge surface.

[0018] The positive and progressive effects of the present utility model are as follows: Compared with common similar technologies, in the combined seal structure of the high-temperature submerged pump provided by the present utility model, a liquid-throwing disc is added between the shaft and the packing shaft sleeve. Under the action of centrifugal force, the high-temperature medium is thrown away from the liquid-throwing disc and falls on the inner wall of the protection pipe and flows into the lower medium, greatly reducing the impact of the high-temperature medium on the seal part.

[0019] In order to seal the high-temperature and high-pressure gas generated by the high-temperature medium, the present utility model adds a design of an annular seal groove at the packing body. When the gas passes through the annular seal groove, it is decompressed step by step, so as to achieve the sealing effect, thereby greatly improving the seal reliability of the pump and ensuring the safe and stable operation of the unit. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an existing similar product.

[0021] Figure 2 It is a schematic diagram of the overall structure of the present utility model.

[0022] Figure 3 is Figure 2 a partial enlarged view of

[0023] The following are the names corresponding to the reference numerals in the present utility model:

[0024] Shaft 1, protection pipe 2, flange 3, key 4, bottom plate 5, metal wound gasket 6, packing body 7, packing shaft sleeve 8, packing gland 9, copper packing 10, purge port 11, packing ring 12, annular seal groove 13, liquid-throwing disc 14, gap 15, annular cavity 16. Detailed Description of the Invention

[0025] The following provides a preferred embodiment of the present utility model in conjunction with the drawings to elaborate in detail the technical solution of the present utility model.

[0026] Figure 2 It is a schematic diagram of the overall structure of the present utility model, Figure 3 is Figure 2 a partial enlarged view of Figure 2 and 3 as shown in: A combined seal structure of a high-temperature submerged pump proposed by the present utility model, which includes: shaft 1, protection pipe 2, flange 3, key 4, bottom plate 5, metal wound gasket 6, packing body 7, packing shaft sleeve 8, packing gland 9, copper packing 10, purge port 11, packing ring 12, annular seal groove 13, liquid-throwing disc 14; the protection pipe 2 is connected to the bottom plate 5 through the flange 3, and the packing body 7 and the bottom plate 5 are sealed with a metal wound gasket 6 and connected with bolts. The packing shaft sleeve 8 is installed on the shaft 1 and connected with a key 4 to prevent it from rotating. The packing ring 12 and the copper packing 10 are sequentially installed in the inner cavity of the packing body 7, and are tightened with the packing gland 9.

[0027] The liquid-slinging disc 14 is located between the shaft 1 and the stuffing box sleeve 8. The liquid-slinging disc 14 and the stuffing box sleeve 8 are connected by the same key 4. The liquid-slinging disc 14 rotates following the shaft. When the high-temperature medium on the shaft 1 touches the liquid-slinging disc 14, it is thrown off the liquid-slinging disc 14 under the action of centrifugal force and lands on the inner wall of the protection tube 2 and flows into the lower medium, greatly reducing the impact of the high-temperature medium on the sealing part. At the same time, since the high-temperature medium will generate high-temperature and high-pressure gas, in order to seal the gas, a ring-shaped sealing groove 13 structure is provided on the surface of the stuffing body 7 that contacts the stuffing box sleeve 8. When the gas passes through each ring-shaped sealing groove 13, the ring-shaped sealing groove 13 includes a gap 15 and a ring-shaped cavity 16, and the gap 15 and the ring-shaped cavity 16 are communicated with each other. In the specific implementation process, both the ring-shaped cavity 15 and the gap 16 include multiple groups, and the gap 15 and the ring-shaped cavity 16 are arranged at intervals. After the air flow enters the ring-shaped cavity 16 at a high speed through the gap 15, it suddenly expands and generates a strong vortex, causing most of the energy of the air flow to be converted into heat and dissipated. At this time, the gas pressure drops step by step, so as to achieve the sealing effect. Nitrogen purging is connected at the packing ring 12, which can ensure the pressure stability inside the pump and form a closed environment to avoid the leakage of high-temperature gas, and three copper packings 10 are provided above for sealing, thus greatly improving the sealing reliability of the pump and ensuring the safe and stable operation of the unit.

[0028] In the specific implementation process, the three copper packings 10 are arranged in an upper, middle and lower position pattern, see Figure 2 .

[0029] In the present utility model, the overall height range of the liquid-slinging disc 14 can be: 2 - 5 cm. In the specific implementation process, other ranges can be selected according to needs. The liquid-slinging disc 14 in the present utility model includes a fixed inner ring and a liquid-slinging outer ring. The fixed inner ring is sleeved on the shaft 1, and the fixed inner ring and the liquid-slinging outer ring are integrally formed. The outer diameter of the fixed inner ring is equal to the outer diameter of the stuffing box sleeve 8. The liquid-slinging outer ring is thick in the middle and thin at the edge. The surface of the liquid-slinging outer ring close to the stuffing box sleeve 8 is a plane, and the surface of the liquid-slinging outer ring far from the stuffing box sleeve 8 is a wedge-shaped surface.

[0030] In the present utility model, a liquid-slinging disc 14 is added between the shaft 1 and the stuffing box sleeve 8. Under the action of centrifugal force, the high-temperature medium is thrown off the liquid-slinging disc 14 and lands on the inner wall of the protection tube 2 and flows into the lower medium, greatly reducing the impact of the high-temperature medium on the sealing part. The design of the shape of the liquid-slinging disc 14 in the present utility model makes it easier for the high-temperature medium to be thrown off the liquid-slinging disc 14 and land on the inner wall of the protection tube 2, so as to flow into the lower medium.

[0031] In order to seal the high-temperature and high-pressure gas generated by the high-temperature medium in the present utility model, the design of the ring-shaped sealing groove 13 is added at the stuffing body 7. The gas is gradually decompressed when passing through the ring-shaped sealing groove, so as to achieve the sealing effect, thus greatly improving the sealing reliability of the pump and ensuring the safe and stable operation of the unit.

[0032] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A high-temperature submersible pump combined sealing structure, the high-temperature submersible pump combined sealing structure comprising: The invention comprises a shaft, a protective tube, a flange, a key, a bottom plate, a metal spiral wound gasket, a packing body, a packing sleeve, a packing gland, a copper packing, a purge port, and a packing ring. The high-temperature submersible pump combined sealing structure further comprises an annular sealing groove and a liquid-throwing plate. The protective tube is connected to the bottom plate by a flange. The packing body and the bottom plate are sealed with a metal spiral wound gasket and connected with bolts. The packing sleeve is mounted on the shaft and connected with a key to prevent it from rotating. The packing ring and the copper packing are sequentially installed in the inner cavity of the packing body and are compressed by a packing gland. The liquid-spinning plate is located between the shaft and the packing sleeve. The liquid-spinning plate and the packing sleeve are connected with the same key, and the liquid-spinning plate rotates with the shaft. An annular sealing groove structure is provided on the surface of the packing body that contacts the packing sleeve, and a nitrogen purge port is connected to the packing ring. Three copper packings are provided above the purge port for sealing.

2. The high-temperature submersible pump combined sealing structure according to claim 1 is characterized in that: The annular sealing groove comprises a gap and an annular cavity, and the gap and the annular cavity are communicated with each other.

3. The high-temperature submersible pump combined sealing structure according to claim 2 is characterized in that: The annular cavity and the gap each include a plurality of groups, gaps and annular cavity gap arrangements.

4. The high-temperature submersible pump combined sealing structure according to claim 1 is characterized in that: The three plates of copper filler are arranged in the upper, middle and lower positions.

5. The high-temperature submersible pump combined sealing structure according to claim 1 is characterized in that: The overall height range of the spin tray is: 2-5cm.

6. The high-temperature submersible pump combined sealing structure according to claim 1 is characterized in that: The liquid-throwing plate comprises a fixed inner ring and a liquid-throwing outer ring, and the fixed inner ring is sleeved on the shaft.

7. The high-temperature submersible pump combined sealing structure according to claim 6, characterized in that: The fixed inner ring and the liquid-spinning outer ring are integrally formed.

8. The high-temperature submersible pump combined sealing structure according to claim 6 or 7, characterized in that: The outside diameter of the fixed inner ring is equal to the outside diameter of the packing sleeve.

9. The high-temperature submersible pump combined sealing structure according to claim 6 or 7, characterized in that: The liquid-throwing outer ring is thick in the middle and thin at the edge.

10. The high-temperature submersible pump combined sealing structure according to claim 6 or 7, characterized in that: The surface of the liquid-splitting outer ring close to the packing sleeve is a plane, and the surface of the liquid-splitting outer ring away from the packing sleeve is a wedge-shaped surface.

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