CN216950956U

CN216950956U - Negative pressure adjusting device for single-stage double-suction centrifugal pump

Info

Publication number: CN216950956U
Application number: CN202220571516.1U
Authority: CN
Inventors: 周程翔; 严丙磊; 王国豪; 俞敏; 孙臣璐; 蒋丹华; 朱丽霞; 林涵; 王艳玲
Original assignee: Shanghai Shidongkou Second Power Plant of Huaneng Power International Inc
Current assignee: Shanghai Shidongkou Second Power Plant of Huaneng Power International Inc
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-07-12
Anticipated expiration: 2032-03-16

Abstract

The utility model discloses a negative pressure adjusting device for a single-stage double-suction centrifugal pump, which comprises a flow adjusting assembly, a flow adjusting assembly and a flow adjusting assembly, wherein the flow adjusting assembly comprises a shell and a pipe body arranged at the top of the shell; and the stuffing assembly is arranged in the shell and comprises a stuffing box arranged in the shell and a packing arranged in the stuffing box. The device has a simple structure, has popularization and use values, can save a large amount of expenses for purchasing parts such as the packing and the like, greatly reduces the frequency of screwing the packing gland bolt due to the avoidance of dry friction between the packing and the shaft, reduces the loss of the packing and the packing shaft sleeve, prolongs the service life of equipment, saves the use amount of spare parts, ensures the reliability of the equipment due to the fact that the packing gland bolt does not need to be screwed down frequently any more, and has the condition of long-time operation due to the reduction of the times of replacing the packing and the packing shaft sleeve.

Description

Negative pressure adjusting device for single-stage double-suction centrifugal pump

Technical Field

The utility model relates to the technical field of centrifugal pumps, in particular to a negative pressure adjusting device for a single-stage double-suction centrifugal pump.

Background

A packing seal is a sealing device between a shaft and a housing that blocks a leakage path with an elastic, plastic material or an element having an elastic structure. According to the structural characteristics, the sealing device can be divided into soft packing sealing, hard packing sealing, forming packing sealing, oil sealing and the like, wherein the soft packing sealing is called gland packing sealing, commonly called packing, is a compression type sealing for filling a circular seam, is the earliest sealing device in the world, and has wide application so far because the soft packing sealing structure is simple, low in cost and convenient to disassemble and assemble, particularly, a plurality of new structures and new materials appear in the year, and the soft packing sealing is newly developed and is generally used for sealing an annular space between a rotating or reciprocating element and a shell, such as a centrifugal pump, a rotor pump and a reciprocating pump, and can adapt to the sealing of various rotating, reciprocating and spiral elements. From the basic requirements for a soft packing seal structure, there are several main problems: 1. the stress state is poor; the soft packing is a flexible body which is different from a rigid body in the transmission of the compression force, the radial compression force of the packing to the shaft is unevenly distributed, and the soft packing is gradually decreased from the end close to the gland to the end far away from the gland and gradually becomes gentle; 2. the heat dissipation and cooling capabilities are insufficient; in the soft packing sealing, the contact surface of the east China is large, the heat generated by friction is large, the heat needs to pass through the thick packing during heat dissipation, and the heat conducting performance of most soft packing is poor. The frictional heat is not easy to be transferred; 3. the automatic compensation capability is poor; after the soft packing is worn, the gaps between the packing and the pump shaft and between the packing and the inner wall of the packing box become larger, the leakage amount is gradually increased along with the increase of the gaps, and the gland bolt needs to be frequently screwed.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the utility model.

The present invention has been made in view of the above and/or other problems occurring in the conventional negative pressure regulating device for a single-stage double-suction centrifugal pump.

Therefore, the problem to be solved by the utility model is that the stress state is poor; the heat dissipation and cooling capacity is not enough and the automatic compensation capacity is poor.

In order to solve the technical problems, the utility model provides the following technical scheme: a negative pressure adjusting device for a single-stage double-suction centrifugal pump comprises a flow adjusting assembly, a flow adjusting assembly and a suction pipe, wherein the flow adjusting assembly comprises a shell and a pipe body arranged at the top of the shell; and the stuffing assembly is arranged in the shell and comprises a stuffing box arranged in the shell and a packing arranged in the stuffing box.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the casing is including setting up in inside pump body, the pump body sets up to single-stage double suction centrifugal pump.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the casing still including set up in the inside main shaft of the pump body, the main shaft set up in the central point of the pump body puts.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the shell further comprises two bearing bodies arranged at one end of the main shaft, and the two bearing bodies are symmetrically arranged.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the body is including setting up in the connecting pipe of one end, the outside of connecting pipe with the one end intercommunication of body.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the body still including set up in the flow control valve in the outside, the body with flow control valve intercommunication.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the stuffing box comprises a stuffing groove arranged inside, and stuffing is arranged inside the stuffing groove.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the packing is including setting up in the sealed water filling opening of compensation of one end.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the packing is still including setting up in the water seal ring of one side.

As a preferable scheme of the negative pressure adjusting device for the single-stage double-suction centrifugal pump of the present invention, wherein: the water seal ring is including setting up in inside opening, and set up in the channel in the water seal ring outside.

The utility model has the beneficial effects that: the packing gland bolt tightening device has a simple structure and popularization and use values, can save a large amount of expenses for purchasing parts such as packing and the like, greatly reduces the frequency of tightening the packing gland bolt due to the avoidance of dry friction between the packing and a shaft, reduces the loss of the packing and the packing shaft sleeve, prolongs the service life of equipment, reduces the workload of workers, saves the use amount of spare parts, ensures the reliability of the equipment due to the fact that the packing gland bolt is not required to be tightened frequently any more, and has long-time operation conditions due to the reduction of the times of replacing the packing and the packing shaft sleeve.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

fig. 1 is a structural diagram of a negative pressure regulating device for a single-stage double-suction centrifugal pump.

Fig. 2 is a structure diagram of a stuffing assembly of a negative pressure regulating device for a single-stage double-suction centrifugal pump.

Fig. 3 is a connecting structure diagram of a stuffing box of the negative pressure adjusting device for the single-stage double-suction centrifugal pump.

Fig. 4 is a water seal ring connection structure diagram of the negative pressure adjusting device for the single-stage double-suction centrifugal pump.

Fig. 5 is a structure diagram of a water seal ring of the negative pressure adjusting device for the single-stage double-suction centrifugal pump.

Fig. 6 is a packing structure diagram of the alternate advancing process of the negative pressure adjusting device for the single-stage double-suction centrifugal pump.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 and 2, for the first embodiment of the present invention, the embodiment provides a negative pressure regulating device for a single-stage double-suction centrifugal pump, which includes a flow regulating assembly 100 and a stuffing assembly 200, by providing the flow regulating assembly 100 and the stuffing assembly 200, the amount of compensating seal water can be increased or decreased according to actual conditions, so that the sealing and cooling effects are optimized, meanwhile, water flowing out of the stuffing assembly can also absorb heat generated by friction between a packing and a shaft, and finally discharged into a drainage channel, and in addition, the packing between a water seal ring and a packing gland can be lubricated, so that dry friction is avoided.

Specifically, the flow regulating assembly 100 includes a housing 101, and a pipe 102 disposed on the top of the housing 101. By arranging the shell 101 and the pipe body 102 and communicating the shell 101 and the pipe body 102, the sealing effect and the cooling effect can be optimized by compensating the amount of sealing water.

Preferably, the stuffing assembly 200, disposed inside the casing 101, includes a stuffing box 201 disposed inside the casing 101, and a packing 202 disposed inside the stuffing box 201. By providing the stuffing box 201 inside the casing 101 and providing the packing 202 inside the stuffing box 201, the sealing performance can be improved.

When using, through setting up casing 101 and body 102, and casing 101 is linked together with body 102, can conveniently be through the volume of compensation seal water, make sealed, the cooling effect reaches the best, and can increase or reduce the volume of compensation seal water according to actual conditions, make sealed, the cooling effect reaches the best, the water outside the flow direction stuffing box simultaneously can absorb packing and the heat that the axle friction produced equally, finally discharge into the water drainage tank in, can lubricate the packing between water seal ring to the gland in addition, dry friction has been avoided.

Example 2

Referring to fig. 1 and 2, a second embodiment of the present invention is based on the previous embodiment.

Specifically, the casing 101 includes a pump body 101a disposed inside, and the pump body 101a is configured as a single-stage double-suction centrifugal pump. By providing the pump body 101a and fixedly connecting the housing 101 and the pump body 101a, the overall strength of the pump body 101a can be improved.

Preferably, the housing 101 further includes a main shaft 101b disposed inside the pump body 101a, and the main shaft 101b is disposed at a central position of the pump body 101 a. By providing the main shaft 101b, the function of the pump body 101a can be realized.

Preferably, the housing 101 further includes two bearing bodies 101c disposed at one end of the main shaft 101b, and the two bearing bodies 101c are symmetrically disposed. By providing the bearing body 101c, the load on the main shaft 101b can be resolved and borne.

Preferably, the pipe body 102 includes a connecting pipe 102a provided at one end, and the outside of the connecting pipe 102a communicates with one end of the pipe body 102. Through setting up connecting pipe 102a, can conveniently communicate with body 102, make things convenient for the size regulation of water yield.

Preferably, the tube 102 further includes a flow control valve 102b disposed on the outside, and the tube 102 is in communication with the flow control valve 102 b. By arranging the flow control valve 102b, the water quantity can be further conveniently adjusted, and the sealing cooling effect can be optimal.

When using, through setting up casing 101 and body 102, and casing 101 is linked together with body 102, can conveniently be through the volume of compensation sealing water, make sealed, the cooling effect reaches the best, and can increase or reduce the volume of compensation sealing water according to actual conditions, make sealed, the cooling effect reaches the best, the water outside the flow direction stuffing box simultaneously can absorb the heat that packing and axle friction produced equally, finally discharge into in the water drainage tank, packing between can lubricated water seal ring to the gland in addition, dry friction has been avoided, through setting up pump body 101a, and casing 101 carries out fixed connection with pump body 101a, can improve the bulk strength of pump body 101a, through setting up bearing body 101c, the resolvable load that bears main shaft 101b on.

Example 3

Referring to fig. 1 to 4, there is shown a third embodiment of the present invention, which is based on the first two embodiments.

Specifically, the stuffing box 201 includes a stuffing box 201a disposed inside, and stuffing is disposed inside the stuffing box 201 a. Through setting up packing groove 201a, can conveniently install the packing.

Preferably, the packing set 202 includes a compensation seal water injection port 202a provided at one end. Through setting up compensation seal water filling opening 202a, compensation seal water filling opening 202a communicates with each other with the water seal ring 202b of installing in the middle of packing 202, and horizontal single-stage double entry centrifugal pump both ends stuffing box 201 is adjacent with the sunction inlet that is located the pump both ends, and the stuffing box 201 department is the negative pressure state when leading to the pump operation, and the compensation seal water of drawing forth from the pump export inserts the water seal ring after, one side flow direction pump suction inlet, outside one side flow direction stuffing box, the water that flows to the pump suction inlet can play sealed effect between packing 202 and axle.

Preferably, the packing set 202 further includes a water seal ring 202b disposed on one side. The sealing function can be achieved by the arranged water seal ring 202 b.

Preferably, the water seal ring 202b includes a through opening 202b-1 disposed inside and a channel 202b-2 disposed outside the water seal ring 202 b. The water seal ring 202b can be conveniently installed by providing the through opening 202b-1 and the groove 202 b-2.

When in use, the casing 101 and the pipe body 102 are arranged, the casing 101 is communicated with the pipe body 102, the sealing and cooling effects can be optimized by compensating the amount of sealing water conveniently, the amount of the sealing water can be increased or decreased according to actual conditions, the sealing and cooling effects can be optimized, meanwhile, water flowing out of the stuffing box can absorb heat generated by friction between a packing and a shaft and is finally discharged into a water discharge tank, in addition, the packing between a water seal ring and a stuffing gland can be lubricated, dry friction is avoided, by arranging the pump body 101a, and fixedly connecting the casing 101 and the pump body 101a, the overall strength of the pump body 101a can be improved, by arranging the bearing body 101c, the load on the main shaft 101b can be decomposed and borne, one path of water is led from the outlet of the single-stage double-suction centrifugal pump and passes through the flow regulating valve 102b and is connected to the compensation sealing water injection ports 202a of the stuffing boxes 201 at two ends of the pump body 101a, the compensating sealing water injection port 202a is communicated with a water seal ring 202b arranged in the middle of the packing 202, the stuffing boxes 201 at two ends of the horizontal single-stage double-suction centrifugal pump are adjacent to suction ports at two ends of the pump, so that the stuffing boxes 201 are in a negative pressure state when the pump operates, compensating sealing water led out from the outlet of the pump flows to (sucked into) the suction port of the pump at one side and flows out of the stuffing boxes at the other side after being connected into the water seal ring, and water flowing to the suction port of the pump can play a sealing role between the packing 202 and the shaft and absorb heat generated by friction between the packing 202 and the shaft and finally is merged into working liquid of the pump again; the water flowing out of the stuffing box 201 can also absorb the heat generated by the friction between the packing 202 and the shaft and finally discharged into a drainage tank, and in addition, the packing 202 between a water seal ring and a packing gland can be lubricated, so that the dry friction is avoided, and because of the existence of the flow regulating valve 102b, the amount of compensating sealing water can be increased or reduced according to the actual condition, so that the sealing and cooling effects reach the best.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. The utility model provides a negative pressure adjusting device for single-stage double suction formula centrifugal pump which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the flow regulating assembly (100) comprises a shell (101) and a pipe body (102) arranged at the top of the shell (101); and the number of the first and second groups,

the packing assembly (200) is arranged inside the shell (101), and comprises a packing (201) arranged inside the shell (101) and a packing (202) arranged inside the packing (201).

2. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 1, wherein: the casing (101) comprises a pump body (101a) arranged inside, and the pump body (101a) is arranged to be a single-stage double-suction centrifugal pump.

3. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 2, wherein: the shell (101) further comprises a main shaft (101b) arranged inside the pump body (101a), and the main shaft (101b) is arranged in the center of the pump body (101 a).

4. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 3, wherein: the shell (101) further comprises two bearing bodies (101c) arranged at one end of the main shaft (101b), and the two bearing bodies (101c) are symmetrically arranged.

5. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 1, wherein: the pipe body (102) comprises a connecting pipe (102a) arranged at one end, and the outer side of the connecting pipe (102a) is communicated with one end of the pipe body (102).

6. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 1 or 5, wherein: the pipe body (102) further comprises a flow control valve (102b) arranged on the outer side, and the pipe body (102) is communicated with the flow control valve (102 b).

7. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 6, wherein: the stuffing box (201) comprises a stuffing groove (201a) arranged inside, and stuffing is arranged inside the stuffing groove (201 a).

8. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 1, wherein: the packing (202) includes a compensating sealing water injection port (202a) provided at one end.

9. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 1 or 8, wherein: the packing (202) further comprises a water seal ring (202b) arranged on one side.

10. The negative pressure regulating device for the single-stage double-suction centrifugal pump according to claim 9, wherein: the water seal ring (202b) comprises a through opening (202b-1) arranged inside and a channel (202b-2) arranged outside the water seal ring (202 b).