Sealing cavity pressure balancing device

Abstract

The utility model discloses a sealing cavity pressure balancing device, which belongs to the technical field of machine pump sealing cavity pressure balancing, and comprises a main shaft, a sealing large cover, a sealing gland and a machine pump, an impeller is arranged on one side of the main shaft, and the machine pump is arranged on the outer side of the impeller and is in assembly connection with the sealing large cover; a sealing cavity is formed between the outer wall of the main shaft and the inner sides of the sealing large cover and the sealing gland, the sealing large cover is provided with a sealing pressure reduction sleeve, a conveying assembly is arranged at the position, located in the sealing cavity, of the main shaft, and the main shaft is provided with a sealing assembly; a pressure gauge arranged on the outer side of the sealing large cover is communicated with the sealing cavity, and a flushing pipe arranged on the outer side of the sealing gland is communicated with the sealing cavity. Clean and stable media can be introduced into the sealing cavity, so that the media in the sealing cavity are kept clean, meanwhile, the stability of pressure in the sealing cavity is ensured, and mechanical sealing failure caused by accumulation at a friction pair is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure balancing in a sealed cavity of a pump, in particular to a sealed cavity pressure balancing device. Background Art

[0002] Mechanical seal is a shaft sealing structure used in pumps to prevent leakage of media through the gap between the rotor and stator. It can eliminate the radial gap between the rotor and stator and play a good sealing role. Therefore, it is widely used in mechanical rotating equipment. However, the existing shaft sealing structure will allow uneven, clean, and unstable media such as particles to enter the sealing cavity, causing accelerated damage to the sealing friction pair and reducing its service life. Utility Model Content

[0003] The main purpose of the utility model is to solve the above-mentioned technical problems to a certain extent, and to propose a sealing chamber pressure balancing device, which can introduce clean and stable media into the sealing chamber, so that the media in the sealing chamber remains clean, while ensuring the stability of the pressure in the sealing chamber, and preventing accumulation at the friction pair and causing mechanical seal failure.

[0004] The above-mentioned problem to be solved by the present invention is achieved through the following technical solutions:

[0005] A sealed chamber pressure balancing device is proposed, comprising a main shaft, a sealing cover, a sealing pressure cover and a machine pump, wherein an impeller is provided on one side of the main shaft, and the machine pump is arranged on the outside of the impeller and assembled with the sealing cover; a sealed chamber is formed between the outer wall of the main shaft and the inner sides of the sealing cover and the sealing pressure cover, wherein the side of the sealing cover close to the impeller is provided with a sealing pressure reducing sleeve for sealing the front end opening of the sealed chamber, a conveying assembly is provided at the position of the main shaft located in the sealed chamber, and a sealing assembly is provided on the side of the main shaft located on the sealing pressure cover for sealing the rear end opening of the sealed chamber; a pressure gauge arranged on the outside of the sealing cover is connected to the sealed chamber, a flushing pipe arranged on the outside of the sealing pressure cover is connected to the sealed chamber, and a flow meter is provided on the flushing pipe.

[0006] In some embodiments, the sealing assembly includes a mounting seat, a sealing dynamic ring and a sealing static ring. The sealing static ring is fixed on the inner side of the sealing cover and seals the rear end opening of the sealing cavity. The mounting seat is fixed on the main shaft and assembled and connected to the conveying assembly. The sealing dynamic ring is assembled and connected to the elastic part set on the mounting seat, so that the sealing dynamic ring is pressed against the sealing static ring by the elastic part, and a friction pair is formed between the sealing dynamic ring and the sealing static ring when the main shaft rotates.

[0007] In some embodiments, the elastic member is a spring.

[0008] In some embodiments, the conveying assembly includes a conveying seat, which is fixed to the main shaft and assembled with the mounting seat. The outer wall of the conveying seat is inclined upward from the side close to the impeller to the side away from the impeller, and a spiral groove is provided on its outer wall.

[0009] In some embodiments, the pressure on the side of the delivery seat is greater than the pressure on the side of the impeller.

[0010] In some embodiments, the sealing cover is connected to the sealing cavity with a first channel, the pressure gauge is sealed and connected to the first channel, the sealing pressure cover is connected to the sealing cavity with a second channel, and the flushing pipe is sealed and connected to the second channel.

[0011] The above technical solution provided by this application has the following advantages compared with the existing technology:

[0012] The utility model provides a flushing pipe at the connection point between the sealing gland and the sealing cavity, which introduces clean and stable sealing cavity medium into the sealing cavity, so that the medium in the sealing cavity remains relatively clean, and at the same time ensures that the pressure in the sealing cavity is stable, avoiding uneven medium such as particles from entering the sealing cavity from the position of the sealing decompression sleeve, and preventing accumulation at the friction pair to cause mechanical seal failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0014] Figure 1 This is a structural diagram of the sealed chamber pressure balancing device of the present invention.

[0015] Description of Figure Numbers:

[0016] 1-main shaft; 2-sealing cover; 3-sealing gland; 4-machine pump; 5-impeller; 6-suction end; 7-discharge end; 8-sealing chamber; 9-sealing pressure reducing sleeve; 10-conveyor seat; 11-mounting seat; 12-sealing dynamic ring; 13-sealing static ring; 14-elastic part; 15-first channel; 16-pressure gauge; 17-second channel; 18-flushing pipe; 19-spiral groove. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] like Figure 1As shown, the utility model proposes a sealed chamber pressure balancing device, including a main shaft 1, a sealing cover 2, a sealing gland 3 and a machine pump 4. An impeller 5 is provided on one side of the main shaft 1. The machine pump 4 is arranged on the outside of the impeller 5 and is assembled and connected with the sealing cover 2. The gap between the machine pump 4, the impeller 5 and the sealing cover 2 forms a medium channel, wherein the suction end 6 and the discharge end 7 of the machine pump 4 are respectively communicated with the medium channel. A sealed chamber 8 is formed between the outer wall of the main shaft 1 and the inner sides of the sealing cover 2 and the sealing gland 3, wherein the side of the sealing cover 2 close to the impeller 5 is provided with a sealing decompression sleeve 9 for sealing the front end opening of the sealed chamber 8. The main shaft 1 is located on one side of the sealing gland 3 and is provided with a sealing pressure reducing sleeve 9 for sealing the front end opening of the sealed chamber 8. There is a sealing assembly for sealing the rear end opening of the sealing chamber 8. A conveying seat 10 is provided at the position of the main shaft 1 in the sealing chamber 8. The specific sealing assembly includes a mounting seat 11, a sealing dynamic ring 12 and a sealing static ring 13. The sealing static ring 13 is fixed on the inner side of the sealing cover 3 and seals the rear end opening of the sealing chamber 8. The mounting seat 11 is fixed on the main shaft 1 and assembled with the conveying seat 10. The sealing dynamic ring 12 is assembled with an elastic member 14 provided on the mounting seat 11. The elastic member 14 adopts a spring so that the sealing dynamic ring 12 is pressed against the sealing static ring 13 by the spring, and a friction pair is formed between the sealing dynamic ring 12 and the sealing static ring 13 when the main shaft 1 rotates.

[0021] The sealing cover 2 is connected to the sealing chamber 8 and is provided with a first channel 15. The pressure gauge 16 provided on the outside of the sealing cover 2 is sealed and connected to the first channel 15. The pressure in the sealing chamber 8 is monitored by the pressure gauge 16. When the friction pair of the sealing dynamic ring 12 and the sealing static ring 13 suddenly fails, the pressure in the sealing chamber 8 is increased by interlocking with the external control terminal through the pressure gauge 16 to dilute the medium from the machine pump 4; the sealing cover 3 is connected to the sealing chamber 8 and is provided with a second channel 17. The flushing pipe 18 provided on the outside of the sealing cover 3 is sealed and connected to the second channel 17.

[0022] A conveying seat 10 is provided at the position of the main shaft 1 in the sealed chamber 8. The conveying seat 10 is fixed to the main shaft 1 and assembled with the mounting seat 11. The outer wall of the conveying seat 10 is inclined upward from the side close to the impeller 5 to the side away from the impeller 5, and a spiral groove 19 is provided on its outer wall.

[0023] During operation, the main shaft 1 drives the impeller 5, the mounting seat 11, the sealing dynamic ring 12 and the conveying seat 10 to rotate. A flushing pipe 18 is provided at the connection between the sealing cover 3 and the sealing chamber 8. The flushing pipe 18 introduces a clean and stable sealing chamber 8 medium into the sealing chamber 8, and the friction pair formed between the sealing dynamic ring 12 and the sealing static ring 13 is flushed and cooled, so that the medium in the sealing chamber 8 remains relatively clean, and the pressure in the sealing chamber 8 is ensured to be stable. When the conveying seat 10 rotates with the main shaft 1, the clean and stable medium inside and outside the sealing chamber 8 flows in the spiral groove 19 to form a pressurized medium, so that the pressure on the side of the conveying seat 10 is greater than the pressure on the side of the impeller 5, thereby blocking the opening of the sealing chamber 8, preventing uneven media such as particles from entering the sealing chamber 8 from the position of the sealing pressure reducing sleeve 9, and preventing accumulation at the friction pair to cause mechanical seal failure.

[0024] Furthermore, a flow meter is provided on the flushing pipe 18, wherein the flow meter is interlocked with the external control terminal. When the pressure in the sealed cavity 8 is lost, the pressure in the sealed cavity 8 is promptly increased and the medium energy in the machine pump 4 is diluted to prevent greater harm.

[0025] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A sealed cavity pressure balancing device, characterized in that: It includes a main shaft, a sealing cover, a sealing gland and a pump. An impeller is provided on one side of the main shaft. The pump is provided on the outside of the impeller and is assembled and connected with the sealing cover. A sealed cavity is formed between the outer wall of the main shaft and the inner sides of the sealing cover and the sealing gland, wherein a sealing pressure reducing sleeve is provided on a side of the sealing cover close to the impeller for sealing the front end opening of the sealed cavity, a conveying assembly is provided on a position of the main shaft located in the sealed cavity, and a sealing assembly is provided on a side of the main shaft located on the sealing gland for sealing the rear end opening of the sealed cavity; The pressure gauge arranged on the outside of the sealing large cover is communicated with the sealing cavity, the flushing pipe arranged on the outside of the sealing gland is communicated with the sealing cavity, and a flow meter is arranged on the flushing pipe.

2. The sealed cavity pressure balancing device according to claim 1, characterized in that: The sealing assembly includes a mounting seat, a sealing dynamic ring and a sealing static ring. The sealing static ring is fixed on the inner side of the sealing cover and seals the rear end opening of the sealing cavity. The mounting seat is fixed on the main shaft and assembled with the conveying assembly. The sealing dynamic ring is assembled with the elastic member provided on the mounting seat so that the sealing dynamic ring is pressed against the sealing static ring by the elastic member, and a friction pair is formed between the sealing dynamic ring and the sealing static ring when the main shaft rotates.

3. The sealed cavity pressure balancing device according to claim 2, characterized in that: The elastic member is a spring.

4. The sealed cavity pressure balancing device according to claim 2, characterized in that: The conveying assembly includes a conveying seat, which is fixed to the main shaft and assembled with the mounting seat. The outer wall of the conveying seat is inclined upward from the side close to the impeller to the side away from the impeller, and a spiral groove is provided on the outer wall.

5. The sealed cavity pressure balancing device according to claim 4, characterized in that: The pressure on the side of the conveying seat is greater than the pressure on the side of the impeller.

6. The sealed chamber pressure balancing device according to claim 1, characterized in that: The sealing cover is connected to the sealing cavity and has a first channel, the pressure gauge is in sealed communication with the first channel, the sealing gland is connected to the sealing cavity and has a second channel, the flushing pipe is in sealed communication with the second channel.

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