CN111550411A - Multistage self-suction type fire pump driven by direct current motor - Google Patents
Multistage self-suction type fire pump driven by direct current motor Download PDFInfo
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- CN111550411A CN111550411A CN202010539818.6A CN202010539818A CN111550411A CN 111550411 A CN111550411 A CN 111550411A CN 202010539818 A CN202010539818 A CN 202010539818A CN 111550411 A CN111550411 A CN 111550411A
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- Prior art keywords
- main
- current motor
- impeller
- water
- pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/08—Multi-stage pumps the stages being situated concentrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/02—Self-priming pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a multistage self-suction type direct current motor-driven fire pump.A direct current motor drives a centrifugal part and an auxiliary centrifugal part through a main shaft and is respectively matched with a front pump section part and a rear pump section part which are arranged in a pump body; a water storage cavity is reserved among the front pump section, the main centrifugal part and the head end of the pump body shell, and the water storage cavity is communicated with the water inlet; a water-gas mixing chamber is reserved among the rear pump section part, the auxiliary centrifugal part and the tail end of the pump body shell, the top end of the water-gas mixing chamber is communicated with the water outlet, the bottom end of the water-gas mixing chamber is communicated with one end of a backflow hole, and the other end of the backflow hole is communicated with the main centrifugal part and an annular vortex chamber reserved in the pump body; the main centrifugal part comprises a main impeller and a preceding stage guide vane arranged on the back surface of the main impeller; the fire pump has good self-priming effect and strong working stability, and is suitable for popularization and use.
Description
Technical Field
The invention relates to the technical field of self-priming pumps, in particular to a multistage self-priming direct-current motor-driven fire pump.
Background
The fire pump belongs to an emergency device, has particularity in the application occasion, and especially during the fire control, the water pump starts soon, and water yield and delivery pressure need satisfy the requirement, can preferably accomplish from inhaling, and in the prior art, the fire pump divide into fixed and portable according to the installation form, divide into electronic and engine drive according to the drive form, divide into single-stage and multistage according to the water pump form, from inhaling or not inhaling the formula.
The self-priming fire pump in the prior art mainly comprises the following components:
1. the injection type is characterized in that an injection device is additionally arranged on the basis of a common pump, so that a negative pressure is generated at an inlet of the water pump, and self-absorption is realized.
2. The vacuum pump type is additionally provided with a vacuum pump for vacuumizing, thereby realizing self-absorption.
3. The valve control type water storage tank is filled with water to submerge the impeller of the water pump and help the water pump to self-suck.
Although the above three types of self-priming pumps can make the water pump generate self-priming function, the following problems generally exist: 1. the structure is complex, the failure rate is high, 2, the noise is large, especially adopt petrol and diesel engine drive, 3, the energy consumption is high, because adopt auxiliary device, increase power consumption, 4, suction stroke is not high, generally below 7M, the time of inhaling usually exceeds 20S.
Disclosure of Invention
The invention aims to provide a multi-stage self-suction type fire pump driven by a direct current motor, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a multistage self-suction type fire pump driven by a direct current motor comprises a pump body and the direct current motor, wherein a motor shaft of the direct current motor is provided with a spindle coaxially connected with the direct current motor, the spindle is positioned in the pump body, the spindle is provided with a centrifugal assembly, the centrifugal assembly comprises a main centrifugal part and an auxiliary centrifugal part, and the main centrifugal part and the auxiliary centrifugal part are respectively matched with a front pump section part and a rear pump section part which are arranged in the pump body;
a water storage cavity is reserved among the front pump section, the main centrifugal part and the head end of the pump body shell, and the water storage cavity is communicated with a water inlet;
a water-gas mixing chamber is reserved among the rear pump section part, the auxiliary centrifugal part and the tail end of the pump body shell, the top end of the water-gas mixing chamber is communicated with the water outlet, and the bottom end of the water-gas mixing chamber is communicated with one end of the backflow hole;
the other end of the backflow hole is communicated with an annular vortex chamber reserved between the main centrifugal part and the pump body;
the main centrifugal part comprises a main impeller and a preceding stage guide vane arranged on the back surface of the main impeller;
the secondary centrifugal part includes a secondary impeller, and a last stage guide vane mounted on a back surface thereof.
Furthermore, the main impeller and the auxiliary impeller respectively comprise a front cover plate, blades and a rear cover plate, the blades are arranged between the front cover plate and the rear cover plate, the blade parts are exposed out of the edges of the front cover plate and the rear cover plate, and the ratio of the exposed height to the diameter of the rear cover plate is 3-5%.
Furthermore, an impeller opening ring is arranged at the center of the front cover plate of the main impeller and the front cover plate of the auxiliary impeller, a plurality of chutes are arranged on the impeller opening ring, and the direction of each chute is consistent with the direction of each blade.
Furthermore, the preceding stage guide vanes and the last stage guide vanes respectively comprise a baffle, a plurality of positive guide vanes are arranged on the front surface of the baffle to form an annular structure, the space inside the annular structure is used for accommodating the blades of the main impeller or the blades of the auxiliary impeller, and the outer edge of the front surface of the baffle inclines towards the back surface of the baffle, and the inclination angle is 5-7 degrees.
Further, the outer diameter of the positive guide vane is smaller than that of the baffle.
Furthermore, the back of the baffle of the front stage guide vane is also provided with a plurality of return guide vanes.
Furthermore, the main shaft is also provided with a locking nut and a mechanical sealing element which are positioned at two sides of the main centrifugal part and the auxiliary centrifugal part, the locking nut acts on the outer side of the main centrifugal part, and the mechanical sealing element acts on the outer side of the auxiliary centrifugal part.
Furthermore, a sliding bearing is installed at the head end of the main shaft, is embedded into a groove of the inner wall of the pump body and is limited by a set screw.
Furthermore, the main impeller and the auxiliary impeller are connected with the main shaft by adopting a flat key.
Further, the direct current motor is a lithium battery motor.
Compared with the prior art, the invention has the beneficial effects that: with lithium cell motor drive, the noise is low, and the size is little, and high efficiency area can, applicable in open-air non-transformer's use occasion, and water pump compact structure, convenient operation, light in weight is fit for fixed and portable installation simultaneously, the multistage impeller of mountable on the main shaft, and furthest improves the outlet pressure of water pump, adopts annular volute, can further improve the water-gas mixture effect.
Drawings
FIG. 1 is a schematic structural view of a pump body according to the present invention;
fig. 2 is a schematic structural diagram of a main impeller or a sub-impeller according to the present invention;
FIG. 3 is a schematic structural view of a positive stage guide vane according to the present invention;
fig. 4 is a schematic structural view of a last stage guide vane proposed by the present invention.
1. A pump body; 2. a direct current motor; 3. a water inlet; 4. a water outlet; 5. a front pump section; 6. a rear pump section; 7. a main shaft; 8. a water storage chamber; 9. a water-gas mixing chamber; 10. a main centrifuge component; 11. a sub-centrifugal part; 12. a return orifice; 13. locking the nut; 14. a mechanical seal; 15. a sliding bearing; 16. tightening the screw; 17. a flat bond; 18. an annular volute chamber; 31. a front cover plate; 32. a rear cover plate; 33. a blade; 34. an impeller eye ring; 35. a chute; 51. a preceding stage guide vane; 52. a baffle plate; 53. a positive guide vane; 54. a return guide vane; 55. and a final stage guide vane.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a multistage self-suction type fire pump driven by a direct current motor comprises a pump body 1 and the direct current motor 2, wherein a motor shaft of the direct current motor 2 is provided with a spindle 7 coaxially connected with the direct current motor, the direct current motor is a lithium battery motor, the spindle 7 is positioned in the pump body 1, the spindle 7 is provided with a centrifugal assembly, the centrifugal assembly comprises a main centrifugal part 10 and an auxiliary centrifugal part 11, and the centrifugal assembly is respectively matched with a front pump section part 5 and a rear pump section part 6 which are arranged in the pump body 1; a water storage cavity 8 is reserved between the front pump section part 5, the main centrifugal part 10 and the head end of the shell of the pump body 1, and the water storage cavity 8 is communicated with the water inlet 3; a water-gas mixing chamber 9 is reserved between the rear pump section part 6, the auxiliary centrifugal part 11 and the tail end of the shell of the pump body 1, the top end of the water-gas mixing chamber 9 is communicated with the water outlet 4, and the bottom end of the water-gas mixing chamber is communicated with one end of the backflow hole 12; the other end of the return hole 12 is communicated with an annular vortex chamber 18 reserved between the main centrifugal part 10 and the pump body 1; the main centrifugal part 10 includes a main impeller, and a preceding stage guide vane 51 mounted on the back surface thereof; the secondary centrifugal part 11 includes a secondary impeller and a last stage vane 55 mounted on its back face.
The main impeller and the auxiliary impeller respectively comprise a front cover plate 31, blades 33 and a rear cover plate 32, the blades 33 are arranged between the front cover plate 31 and the rear cover plate 32, the blades 33 are partially exposed out of the edges of the front cover plate 31 and the rear cover plate 32, the ratio of the exposed height to the diameter of the rear cover plate 32 is 3-5%, and by adopting the structure, the water-air mixing effect can be enhanced, and air suction is further improved.
The central point department of the front shroud 31 of main impeller and auxiliary impeller is equipped with impeller choma 34, and is equipped with a plurality of chute 35 on the impeller choma 34, the chute 35 direction with the blade 33 direction is unanimous, adopts this kind of structure, can prevent that fire pump choma is dead owing to corrosion card in aqueous for a long time, can improve the reliability of fire pump work.
The preceding stage guide vanes 51 and the last stage guide vanes 55 both comprise a baffle 52, a plurality of positive guide vanes 53 are arranged on the front surface of the baffle 52 to form an annular structure, and the space inside the annular structure is used for accommodating the blades 33 of the main impeller or the blades 33 of the auxiliary impeller. The outer diameter of the positive guide vane 53 is smaller than that of the baffle 52, so that an annular vortex chamber 18 is formed between the positive guide vane 53 and the pump body 1, the water-gas mixing effect is improved, and the self-priming performance is improved. The back of the baffle 52 of the front stage guide vane 51 is also provided with a plurality of back guide vanes 54, and the outer edge of the front side of the baffle 52 inclines towards the back direction, the inclination angle is 5-7 degrees, so that water uniformly flows into the annular vortex chamber 18 and the back guide vanes 54, and the efficiency of the water pump can be improved.
The back of the baffle 52 of the last stage guide vane 55 is not provided with the return guide vane 54, and a planar structure is adopted, so that the water-gas mixed liquid can enter the water-gas mixing chamber 9 from the last stage guide vane 55, the speed is suddenly reduced, the water-gas separation effect is improved, the water-gas mixture is separated under the action of density difference, the gas rises above the water-gas mixing chamber 9 and is discharged into the water outlet 4, and the liquid sinks below the water-gas mixing chamber 9 and circulates back to the annular vortex chamber 18 through the return hole 12.
The main shaft 7 is also provided with a locking nut 13 and a mechanical sealing element 14 which are positioned at two sides of the main centrifugal part 10 and the auxiliary centrifugal part 11, the locking nut 13 acts on the outer side of the main centrifugal part 10, the mechanical sealing element 14 acts on the outer side of the auxiliary centrifugal part 11, the head end of the main shaft 7 is provided with a sliding bearing 15, the sliding bearing 15 is embedded into a groove on the inner wall of the pump body 1 and limited by a set screw 16, and the main impeller and the auxiliary impeller are connected with the main shaft 7 by adopting a flat key 17, so as to ensure the stability of the main centrifugal part 10, the auxiliary centrifugal part 11 and the main shaft 7 during working.
The working principle of the invention is as follows: when the fire pump works, the direct current motor 2 drives the main centrifugal part 10 and the auxiliary centrifugal part 11 to rotate through the main shaft 7, external water enters the water storage chamber 8 through the water inlet 3 on the pump body 1, then enters the front stage guide vane 51 through the main impeller, then enters the annular vortex chamber 18, so that the water and the gas shells are fully mixed, the fully mixed water enters the auxiliary impeller through the counter guide vane 54 of the front stage guide vane 51, finally enters the water and gas mixing chamber 9 through the final stage guide vane 55, the water and gas mixture is separated under the action of density difference, the gas rises above the water and gas mixing chamber 9 and is discharged into the water outlet 4, the liquid sinks below the water and gas mixing chamber 9 and circulates back to the annular vortex chamber 18 through the return hole 12, and the circulation is carried out until the gas in the fire pump is completely discharged, and the pump enters a normal operation state.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a multistage formula direct current motor drive fire pump of inhaling, includes the pump body and direct current motor, installs the main shaft rather than coaxial coupling on direct current motor's the motor shaft, and the main shaft is located the pump body, installs centrifugal subassembly, its characterized in that on the main shaft: the centrifugal component comprises a main centrifugal part and an auxiliary centrifugal part, and is respectively matched with a front pump section part and a rear pump section part which are arranged in the pump body;
a water storage cavity is reserved among the front pump section, the main centrifugal part and the head end of the pump body shell, and the water storage cavity is communicated with a water inlet;
a water-gas mixing chamber is reserved among the rear pump section part, the auxiliary centrifugal part and the tail end of the pump body shell, the top end of the water-gas mixing chamber is communicated with the water outlet, and the bottom end of the water-gas mixing chamber is communicated with one end of the backflow hole;
the other end of the backflow hole is communicated with an annular vortex chamber reserved between the main centrifugal part and the pump body;
the main centrifugal part comprises a main impeller and a preceding stage guide vane arranged on the back surface of the main impeller;
the secondary centrifugal part includes a secondary impeller, and a last stage guide vane mounted on a back surface thereof.
2. The multi-stage self-priming direct-current motor-driven fire pump according to claim 1, characterized in that: the main impeller and the auxiliary impeller respectively comprise a front cover plate, blades and a rear cover plate, the blades are arranged between the front cover plate and the rear cover plate, the blade parts are exposed out of the edges of the front cover plate and the rear cover plate, and the ratio of the exposed height to the diameter of the rear cover plate is 3-5%.
3. The multi-stage self-priming direct-current motor-driven fire pump as claimed in claim 2, wherein: the central positions of the front cover plates of the main impeller and the auxiliary impeller are provided with impeller opening rings, the impeller opening rings are provided with a plurality of chutes, and the directions of the chutes are consistent with the directions of the blades.
4. The multi-stage self-priming direct-current motor-driven fire pump as claimed in claim 2, wherein: the front stage guide vanes and the last stage guide vanes respectively comprise a baffle, a plurality of front guide vanes are arranged on the front surface of the baffle to form an annular structure, the space inside the annular structure is used for containing blades of a main impeller or blades of an auxiliary impeller, the outer edge of the front surface of the baffle inclines towards the back surface of the baffle, and the inclination angle is 5-7 degrees.
5. The multi-stage self-priming direct-current motor-driven fire pump according to claim 4, characterized in that: the outer diameter of the positive guide vane is smaller than that of the baffle.
6. The multi-stage self-priming direct-current motor-driven fire pump according to claim 4, characterized in that: the baffle back of preceding stage stator still is equipped with a plurality of anti-stator.
7. The multi-stage self-priming direct-current motor-driven fire pump according to claim 6, characterized in that: the main shaft is also provided with a locking nut and a mechanical sealing element which are positioned at two sides of the main centrifugal part and the auxiliary centrifugal part, the locking nut acts on the outer side of the main centrifugal part, and the mechanical sealing element acts on the outer side of the auxiliary centrifugal part.
8. The multi-stage self-priming direct-current motor-driven fire pump according to claim 7, characterized in that: the head end of the main shaft is provided with a sliding bearing which is embedded into a groove on the inner wall of the pump body and is limited by a set screw.
9. The multi-stage self-priming direct-current motor-driven fire pump according to claim 1, characterized in that: the main impeller and the auxiliary impeller are connected with the main shaft by adopting a flat key.
10. The multi-stage self-priming direct-current motor-driven fire pump according to claim 1, characterized in that: the direct current motor is a lithium battery motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539818.6A CN111550411A (en) | 2020-06-15 | 2020-06-15 | Multistage self-suction type fire pump driven by direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010539818.6A CN111550411A (en) | 2020-06-15 | 2020-06-15 | Multistage self-suction type fire pump driven by direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111550411A true CN111550411A (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010539818.6A Pending CN111550411A (en) | 2020-06-15 | 2020-06-15 | Multistage self-suction type fire pump driven by direct current motor |
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| CN (1) | CN111550411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718882A (en) * | 2022-04-19 | 2022-07-08 | 宁波君禾智能科技有限公司 | DC centrifugal garden pump |
-
2020
- 2020-06-15 CN CN202010539818.6A patent/CN111550411A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718882A (en) * | 2022-04-19 | 2022-07-08 | 宁波君禾智能科技有限公司 | DC centrifugal garden pump |
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