CN108412813B - Water filling and exhausting device of centrifugal pump without bottom valve and using method thereof - Google Patents

Water filling and exhausting device of centrifugal pump without bottom valve and using method thereof Download PDF

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Publication number
CN108412813B
CN108412813B CN201810055223.6A CN201810055223A CN108412813B CN 108412813 B CN108412813 B CN 108412813B CN 201810055223 A CN201810055223 A CN 201810055223A CN 108412813 B CN108412813 B CN 108412813B
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water
water tank
vacuum
centrifugal pump
bottom valve
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CN108412813A (en
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仵峰
宰松梅
宰长涛
代小平
王亮
王金鹏
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North China University of Water Resources and Electric Power
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North China University of Water Resources and Electric Power
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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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • 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
    • F04D13/16—Pumping installations or systems with storage reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • 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
    • F04D29/007—Details, component parts, or accessories especially adapted for liquid 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 relates to the field of fluid control, in particular to a water filling and exhausting device of a centrifugal pump without a bottom valve, which comprises a vacuum water tank and an exhausting mechanism arranged in the vacuum water tank, wherein a water tank water inlet pipe is distributed at the inlet end of the vacuum water tank, the length of the water tank water inlet pipe extending into the vacuum water tank is 5-10 times of the diameter of the water tank water inlet pipe, and a limiting pipe extends outwards horizontally on the side wall of the water tank water inlet pipe extending end; the air exhaust mechanism comprises an air bag and limiting rods which are respectively fixed on the upper end surface and the lower end surface of the air bag, the air bag is half-wrapped in the limiting pipe, a space is reserved between the air bag and the upper wall and the lower wall of the limiting pipe, and the limiting rods respectively penetrate out of the upper pipe wall and the lower pipe wall of the limiting pipe; the lower part of the vacuum water tank is provided with a drain hole, a drain plug is distributed in the drain hole, and an exhaust bolt is screwed in the position of the upper part of the vacuum water tank corresponding to the exhaust mechanism. The invention also relates to a use method of the water filling and exhausting device of the centrifugal pump without the bottom valve. The invention has simple structure, convenient use, safety, reliability and low cost.

Description

Water filling and exhausting device of centrifugal pump without bottom valve and using method thereof
Technical Field
The invention relates to the field of fluid control, in particular to a water filling and exhausting device of a centrifugal pump without a bottom valve and a using method thereof.
Background
Before starting the centrifugal pump (except for a self-sucking pump), the water pump and the water inlet pipe are filled with water, otherwise, the water pump cannot pump water; the reason that water cannot be discharged after the centrifugal pump is started is that air in the pump is not completely discharged and the water is not filled.
The existing water filling method before the centrifugal pump is started mainly comprises two methods: one method is to fill water by assembling a bottom valve, wherein the bottom valve is a one-way valve and is arranged at the inlet of a water inlet pipe, and the method has the defects that the head loss of the bottom valve is large, and the device efficiency of a water pump is influenced; the other is water filling without bottom valve, the method has the greatest advantage of energy saving, and the energy can be saved by 10-15% compared with a pump station with a bottom valve.
The commonly used water filling method of the centrifugal pump without the bottom valve comprises the following steps:
1. and (3) a vacuum water tank water filling method: for a small pump station without a bottom valve, a vacuum water tank water filling method can be adopted; before the water pump is started, the water tank is filled with water and sealed. After the water pump is started, the water pump feeds water from the vacuum tank, and a certain vacuum is formed in the water tank due to the water level reduction of the water tank, so that the water in the water inlet pool enters the water tank through the water inlet pipe under the action of atmospheric pressure, thereby forming water circulation and enabling the water pump to start normal operation; the water filling method of the vacuum water tank has the disadvantages that in the water filling process, the vacuum water tank needs to be observed for many times to ensure the water filling condition in the vacuum water tank, the overflow phenomenon caused by excessive water filling is avoided, the process is complicated, and the operation intensity can not be effectively reduced.
2. And (3) a jet pump water filling method: when the diesel engine is used for driving the water pump to pump water, waste gas discharged by the diesel engine can be introduced into an ejector communicated with the top of the water pump for air suction and water filling, when the water pump is started, a valve cover connected with a handle is closed, the waste gas is sprayed out of the ejector, and air in the pump is sucked out through a connecting pipe; after the water is filled, the valve cover is opened, and the control valve is closed; the water filling method of the jet pump has the defects of high ground processing capacity, high sinking degree requirement, movable parts in the jet pump and low reliability.
3. The self-water-diversion water-filling method comprises the following steps: for a pump room adopting a semi-submerged type (namely a pump station with the pump top elevations of the water inlet pipe and the water pump below the water surface of the water inlet pool), water can be automatically introduced into the water pump without manual irrigation and diversion; the self-water-diversion and water-filling method has the defects that the water absorption capacity of the water pump is not fully utilized, and meanwhile, the installation height of the water pump is reduced, so that the excavation amount of a foundation is increased, and the operation management is inconvenient.
4. Self-suspension water diversion and water filling method: the self-suspension water filling method is realized by utilizing the unit weight difference of water and gas through the principle of water-gas replacement; the method can remove the bottom valve of the water pump; installing a proper amount of container ventilation tank on the water inlet pipeline, filling water into the ventilation tank in advance when filling water, then sealing by a cover, opening a ventilation valve, closing the ventilation valve after ventilation is finished, and suspending a part of introduced water in the water inlet pipeline; the water inlet pipe can be filled with water after repeated times; the self-suspension water filling method has the disadvantages of repeated operation, high operation strength and poor operation efficiency.
5. A vacuum pump water filling method: for large and medium-sized pump stations with water inlet pipes of more than 300mm in diameter or pump stations with higher automation requirements, the vacuum air extractor is a common water filling device; the water pump can be filled with water by continuously sucking and exhausting air through the vacuum pump; the water filling method by the vacuum pump has the disadvantages of high investment and high cost.
In conclusion, the water filling method of the centrifugal pump without the bottom valve has the advantages of complex structure and higher cost, and the partial centrifugal pump without the bottom valve has movable parts in use, so that the reliability is low, and the use effect is not ideal.
Disclosure of Invention
The invention aims to provide a water filling and exhausting device of a centrifugal pump without a bottom valve, which has the advantages of simple structure, convenience in use, safety and reliability, and a using method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a water filling and exhausting device of a centrifugal pump without a bottom valve comprises a vacuum water tank and an exhausting mechanism arranged in the vacuum water tank, wherein a water tank inlet pipe is distributed at the inlet end of the vacuum water tank, the water tank inlet pipe extends into the vacuum water tank, the length of the water tank inlet pipe extending into the vacuum water tank is 5-10 times of the diameter of the water tank inlet pipe, and a limiting pipe extends outwards horizontally on the side wall of the water tank inlet pipe extending end; the air exhaust mechanism comprises an air bag and limiting rods which are respectively fixed on the upper end surface and the lower end surface of the air bag, the air bag is half-wrapped in the limiting pipe, a space is reserved between the air bag and the upper wall and the lower wall of the limiting pipe, and the limiting rods on the upper end surface and the lower end surface of the air bag respectively penetrate out of the upper pipe wall and the lower pipe wall of the limiting pipe; the side wall of the vacuum water tank is provided with a water outlet, the water outlets of the exhaust mechanism and the vacuum water tank are respectively positioned at the opposite ends of a water inlet pipe of the water tank, the lower part of the vacuum water tank is provided with a drain hole, a drain plug is arranged in the drain hole, the upper part of the vacuum water tank is screwed in an exhaust bolt corresponding to the exhaust mechanism, and the tail end of the exhaust bolt penetrates from the upper part of the vacuum water tank and is in contact connection with the top of a limiting rod at the upper end.
Furthermore, the vacuum water tank comprises a drainage tank body and a drainage tank upper cover which are mutually sealed and buckled, the drainage tank upper cover and the drainage tank body are connected in a sealed and buckled mode to form a hollow closed cavity, and a sealing gasket is arranged between the drainage tank upper cover and the drainage tank body.
Furthermore, a water outlet of the vacuum water tank is connected to the bottomless valve centrifugal pump through a water pump water inlet pipe, a water pump water outlet pipe is arranged at the outlet end of the bottomless valve centrifugal pump, and a gate valve is arranged on the water pump water outlet pipe.
Further, the water outlet of the water inlet pipe of the water tank in the vacuum water tank is higher than the position of an impeller in the centrifugal pump without the bottom valve, and the water inlet of the water inlet pipe of the water tank is connected to a water inlet tank.
Further, the distance between the limiting rod at the upper end of the air bag and the upper plane of the vacuum water tank is not more than the distance between the upper plane of the air bag and the upper wall of the limiting pipe.
Furthermore, a water stop rubber ring is arranged on the drainage plug, and the drainage plug is in threaded connection with the vacuum water tank.
Furthermore, the upper part of the vacuum water tank is provided with an exhaust hole corresponding to the exhaust mechanism, the exhaust bolt is in threaded connection with the exhaust hole, and the tail end of the exhaust bolt is arranged in the vacuum water tank.
A use method of a water filling and exhausting device of a centrifugal pump without a bottom valve comprises the following steps:
step 1, when the centrifugal pump without the bottom valve is used for the first time, before starting, a water inlet of a water inlet pipe of a water tank is inserted below a surface to be pumped of a water inlet pool;
step 2, screwing out an exhaust bolt on the vacuum water tank, and performing exhaust treatment on the vacuum water tank and the bottomless valve centrifugal pump, wherein an exhaust mechanism vertically distributed in the vacuum water tank is in a movable state;
step 3, filling water into the vacuum water tank through a water inlet pipe of the water tank, and enabling the exhaust mechanism to be in a suspension state along with the increase of the water level in the vacuum water tank;
step 4, water in the vacuum water tank enters the centrifugal pump without the bottom valve through a water inlet pipe of the water pump, when a limiting rod at the upper end of the air bag floats out of an exhaust hole at the upper part of the vacuum water tank, the vacuum water tank is full of water, water filling is stopped, an exhaust bolt is screwed into the exhaust hole corresponding to the limiting rod at the upper end of the air bag, the exhaust bolt is screwed, and exhaust and first water filling operations are completed;
and 5, starting the centrifugal pump without the bottom valve, and starting the centrifugal pump without the bottom valve to work.
Further, still include:
when the centrifugal pump without the bottom valve needs to be subjected to anti-freezing treatment, the drain plug in the drain hole is screwed out, and residual water in the vacuum water tank, the centrifugal pump without the bottom valve and a water inlet pipe of the water tank can be discharged; and repeating the steps 1-5 when the centrifugal pump without the bottom valve is used again.
The invention has the beneficial effects that:
1. the vacuum water tank and the exhaust mechanism are additionally arranged on the centrifugal pump without the bottom valve, and the centrifugal pump without the bottom valve is connected with the vacuum water tank through the water inlet pipe of the water pump, so that the structure is simple, the connection and the use are convenient, the processing and the installation are easy, and the cost is low; and no movable part is arranged in the device, so that the device is free from maintenance, and the use reliability of the device is effectively improved.
2. Only need when no bottom valve centrifugal pump is used for the first time vacuum water tank fill water the operation can, effectively improve the operating efficiency, add the exhaust mechanism who establishes, when not influencing the exhaust operation, through the gasbag of upper and lower suspension, can learn the water level condition in the vacuum water tank, in time stop filling water, avoid appearing the overflow phenomenon.
3. The length that the water tank inlet tube stretched into in the vacuum water tank is 5~10 times of water tank inlet tube diameter, and the delivery port of the water tank inlet tube in the vacuum water tank is higher than the position of impeller in the no bottom valve centrifugal pump, produces too big swirl when avoiding the water tank inlet tube to intake, influences exhaust mechanism's operation effect, improves the reliability of exhaust mechanism operation.
4. The gasbag is half wrapped up in spacing intraductal and with spacing between the upper and lower wall of managing leave the interval, spacing pipe carries on spacingly to the gasbag, avoids the gasbag to break away from its predetermined movement track because of floating, guarantees stability and reliability that the gasbag used, and the gasbag is half wrapped up in spacing intraductal simultaneously, does not influence its result of use promptly, save material and manufacturing cost again.
5. The drain hole is additionally arranged at the bottom of the vacuum water tank, and in cold winter, residual water in the vacuum water tank and the centrifugal pump without the bottom valve can be drained through the drain hole, so that the anti-freezing effect of the equipment is realized, the safety and the reliability of the use of the equipment are effectively ensured, and the service life of the equipment is prolonged; when the drainage plug is used, the drainage hole is plugged by the drainage plug, so that the operation is simple and convenient; meanwhile, a water stopping rubber ring is additionally arranged on the drainage plug, so that the sealing effect is improved, and the water in the vacuum water tank is prevented from flowing out from a joint of the drainage plug and the drainage hole.
Drawings
FIG. 1 is a schematic structural diagram of a water filling and exhausting device of a centrifugal pump without a bottom valve.
FIG. 2 is a schematic structural diagram of the connection between the vacuum water tank and the exhaust mechanism of the water filling and exhausting device of the centrifugal pump without the bottom valve.
Fig. 3 is a schematic structural diagram of a gas exhaust mechanism of a water filling and gas exhaust device of a centrifugal pump without a bottom valve.
Fig. 4 is a partial enlarged structural schematic diagram of a water filling and exhausting device of a centrifugal pump without a bottom valve in fig. 2.
FIG. 5 is a schematic perspective view of the connection between the exhaust mechanism and the limiting pipe of the water filling and exhausting device of the centrifugal pump without the bottom valve.
The reference numbers in the drawings are as follows: the centrifugal pump comprises a bottomless valve centrifugal pump 1, a vacuum water tank 2, a water inlet pool 3, a water tank water inlet pipe 4, an exhaust bolt 5, a water pump water inlet pipe 6, a water pump water outlet pipe 7, a gate valve 8, an air bag 9, a drainage tank upper cover 10, a limiting rod 11, a limiting pipe 12, a drainage hole 13, a water stop rubber ring 14, a drainage plug 15, a sealing gasket 16 and a drainage tank body 17.
Detailed Description
The invention is further described with reference to the following figures and detailed description:
as shown in fig. 1 to 5, a water filling and exhausting device of a centrifugal pump without a bottom valve comprises a vacuum water tank 2 and an exhausting mechanism arranged in the vacuum water tank 2, wherein a water tank inlet pipe 4 is distributed at an inlet end of the vacuum water tank 2, the water tank inlet pipe 4 extends into the vacuum water tank 2, the length of the water tank inlet pipe 4 extending into the vacuum water tank 2 is 5-10 times of the diameter of the water tank inlet pipe 4, and a limit pipe 12 extends outwards and horizontally on the side wall of the water tank inlet pipe 4 extending end; the exhaust mechanism comprises an air bag 9 and limiting rods 11 respectively fixed on the upper end surface and the lower end surface of the air bag 9, the air bag 9 is half wrapped in a limiting pipe 12, a space is reserved between the air bag 9 and the upper wall and the lower wall of the limiting pipe 12, and the limiting rods 11 on the upper end surface and the lower end surface of the air bag 9 respectively penetrate out of the upper pipe wall and the lower pipe wall of the limiting pipe 12; the side wall of the vacuum water tank 2 is provided with a water outlet, the water outlets of the exhaust mechanism and the vacuum water tank 2 are respectively positioned at opposite ends of a water tank water inlet pipe 4, a water outlet hole 13 is formed in the lower portion of the vacuum water tank 2, a water drain plug 15 is arranged in the water outlet hole 13, an exhaust bolt 5 is screwed in the position, corresponding to the exhaust mechanism, of the upper portion of the vacuum water tank 2, the tail end of the exhaust bolt 5 penetrates from the upper portion of the vacuum water tank 2 and is in contact connection with the top of a limiting rod 11 at the upper end of the air bag 9, and a sealing gasket is arranged at the.
As an implementation mode, the upper and lower tube walls of the limiting tube 12 are respectively provided with through holes on the same central line, the limiting rods 11 on the upper and lower end surfaces of the air bag 9 respectively penetrate through the through holes on the limiting tube 12, and the limiting rods 11 can move along the through holes on the limiting tube 12 in the same direction.
The vacuum water tank 2 comprises a drainage tank body 17 and a drainage tank upper cover 10 which are mutually sealed, buckled and connected, the drainage tank upper cover 10 and the drainage tank body 17 are connected in a sealed, buckled and connected mode to form a hollow closed cavity, and a sealing gasket 16 is arranged between the drainage tank upper cover 10 and the drainage tank body 17.
The water outlet of the vacuum water tank 2 is connected to the bottomless valve centrifugal pump 1 through a water pump inlet pipe 6, a water pump outlet pipe 7 is arranged at the outlet end of the bottomless valve centrifugal pump 1, and a gate valve 8 is arranged on the water pump outlet pipe 7.
The water outlet of a water tank inlet pipe 4 in the vacuum water tank 2 is higher than the position of an impeller in the centrifugal pump 1 without the bottom valve, and the water inlet of the water tank inlet pipe 4 is connected to a water inlet tank 3.
The distance between the upper end of the air bag 9 and the upper plane of the vacuum water tank 2 is not more than the distance between the upper plane of the air bag 9 and the upper wall of the limiting pipe 12; as an implementation mode, in the initial state, that is, in the state that the vacuum water tank 2 is not filled with water, the limiting rod 11 at the upper end of the air bag 9 is positioned in the vacuum water tank 2 and has a distance of 20cm from the upper plane of the vacuum water tank 2, the upper plane of the air bag 9 has a distance of 22cm from the upper wall of the limiting pipe 12, when the vacuum water tank 2 is filled with water, the air bag 9 is in a floating state, the air bag 9 floats upwards, and the limiting rod 11 at the upper end of the air bag 9 protrudes from the exhaust hole at the upper plane of the vacuum water tank 2.
And a water stopping rubber ring 14 is arranged on the drain plug 15, and the drain plug 15 is in threaded connection with the vacuum water tank 2.
Exhaust holes are distributed in the upper portion of the vacuum water tank 2 corresponding to the exhaust mechanism, the exhaust bolt 5 is in threaded connection with the exhaust holes, and the tail end of the exhaust bolt 5 is placed in the vacuum water tank 2.
As an implementation manner, the volume V of the vacuum water tank 2 in the present embodiment is:
V＝KQ＝πR2h；
wherein K is the second water changing coefficient, Q is the water pump flow, K is 25s, and Q is 0.2m3(s) the volume V of the vacuum water tank 2 is 5m3。
In this embodiment, the air bag 9 is a solid body, and the density of the air bag 9 is equal to the density of water and is 1g/cm3And the buoyancy of the air bag 9 is larger than the sum of the gravity of the air bag 9 and the limiting rod 11.
The use method of the water filling and exhausting device of the centrifugal pump without the bottom valve comprises the following steps:
step 1, when the centrifugal pump 1 without the bottom valve is used for the first time, before starting, a water inlet of a water inlet pipe 4 of a water tank is inserted below a surface to be pumped of a water inlet tank 3;
step 2, screwing out an exhaust bolt on the vacuum water tank 2, and performing exhaust treatment on the vacuum water tank 2 and the bottomless valve centrifugal pump 1, wherein an exhaust mechanism vertically distributed in the vacuum water tank 2 is in a movable state;
step 3, filling water into the vacuum water tank 2 through a water tank water inlet pipe 4, and enabling the exhaust mechanism to be in a suspension state along with the increase of the water level in the vacuum water tank 2;
step 4, along with the increase of the water level in the vacuum water tank 2, water in the vacuum water tank 2 enters the bottomless valve centrifugal pump 1 through the water inlet pipe 6 of the water pump, meanwhile, the air bag 9 floats upwards until the upper plane of the air bag 9 is contacted with the upper wall of the limiting pipe 12, the air bag 9 is blocked and does not float upwards any more, at the moment, the limiting rod 11 at the upper end of the air bag 9 floats out of the exhaust hole at the upper part of the vacuum water tank 2, the water filling is stopped, the exhaust bolt 5 is screwed into the exhaust hole corresponding to the limiting rod 11 at the upper end of the air bag 9, and the exhaust and first water filling operation is completed;
step 5, starting the centrifugal pump 1 without the bottom valve, and starting the operation of the centrifugal pump 1 without the bottom valve; when the centrifugal pump is used next time, the bottomless valve centrifugal pump 1 is directly started, so that water pumping operation can be performed, and water filling and air exhausting operation of the bottomless valve centrifugal pump 1 is not needed.
When the bottomless valve centrifugal pump 1 needs to be subjected to anti-freezing treatment, the drain plug 15 in the drain hole 13 is screwed out, and at the moment, residual water in the vacuum water tank 2, the bottomless valve centrifugal pump 1 and the water tank water inlet pipe 4 can be drained; and when the centrifugal pump 1 without the bottom valve is used again, carrying out water filling and air exhausting operation on the centrifugal pump 1 without the bottom valve again, and repeating the steps 1-5.
It is worth to be noted that the valve is arranged on the water inlet pipe 4 of the water tank, when the vacuum water tank 2 is filled with water, the valve on the water inlet pipe 4 of the water tank is closed, and the vacuum water tank 2 is not filled with water any more; and in the water filling process, closing a gate valve 8 arranged on a water outlet pipe 7 of a water pump at the outlet end of the centrifugal pump 1 without the bottom valve.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.

Claims (7)

1. A water filling and exhausting device of a centrifugal pump without a bottom valve is characterized by comprising a vacuum water tank and an exhausting mechanism arranged in the vacuum water tank, wherein a water tank inlet pipe is distributed at the inlet end of the vacuum water tank, the water tank inlet pipe extends into the vacuum water tank, the length of the water tank inlet pipe extending into the vacuum water tank is 5-10 times of the diameter of the water tank inlet pipe, and a limiting pipe extends outwards horizontally on the side wall of the water tank inlet pipe extending end; the air exhaust mechanism comprises an air bag and limiting rods which are respectively fixed on the upper end surface and the lower end surface of the air bag, the air bag is half-wrapped in the limiting pipe, a space is reserved between the air bag and the upper wall and the lower wall of the limiting pipe, and the limiting rods on the upper end surface and the lower end surface of the air bag respectively penetrate out of the upper pipe wall and the lower pipe wall of the limiting pipe; the side wall of the vacuum water tank is provided with a water outlet, the air exhaust mechanism and the water outlet of the vacuum water tank are respectively positioned at the opposite ends of a water inlet pipe of the water tank, the lower part of the vacuum water tank is provided with a water drain hole, a drain plug is distributed in the water drain hole, an air exhaust bolt is screwed in the position of the upper part of the vacuum water tank, which corresponds to the air exhaust mechanism, and the tail end of the air exhaust bolt penetrates from the upper part of the vacuum water tank and is in contact connection; the water outlet of the vacuum water tank is connected to the bottomless valve centrifugal pump through a water pump inlet pipe, a water pump outlet pipe is arranged at the outlet end of the bottomless valve centrifugal pump, and a gate valve is arranged on the water pump outlet pipe; the water outlet of the water tank inlet pipe in the vacuum water tank is higher than the position of an impeller in the centrifugal pump without the bottom valve, and the water inlet of the water tank inlet pipe is connected to a water inlet pool.
2. The water filling and exhausting device of a centrifugal pump without a bottom valve as recited in claim 1, wherein said vacuum tank comprises a drainage tank body and a drainage tank top cover which are hermetically and snap-connected with each other, said drainage tank top cover and said drainage tank body are hermetically and snap-connected to form a hollow sealed cavity, and a sealing gasket is disposed between said drainage tank top cover and said drainage tank body.
3. The water filling and air discharging device of a centrifugal pump without a bottom valve as claimed in claim 1, wherein the distance between the upper plane of the vacuum tank and the upper plane of the air bag is not greater than the distance between the upper plane of the air bag and the upper wall of the limiting pipe.
4. The water filling and air exhausting device of the centrifugal pump without the bottom valve as recited in claim 1, wherein a water stopping rubber ring is arranged on the drain plug, and the drain plug is in threaded connection with the vacuum water tank.
5. The water filling and exhausting device of a centrifugal pump without a bottom valve as claimed in claim 1, wherein an exhaust hole is formed in the upper portion of the vacuum water tank at a position corresponding to the exhaust mechanism, the exhaust bolt is in threaded connection with the exhaust hole, and the tail end of the exhaust bolt is placed in the vacuum water tank.
6. The use method of the water filling and air exhausting device of the centrifugal pump without the bottom valve in the claim 1 is characterized by comprising the following steps:
step 1, when the centrifugal pump without the bottom valve is used for the first time, before starting, a water inlet of a water inlet pipe of a water tank is inserted below a surface to be pumped of a water inlet pool;
step 2, screwing out an exhaust bolt on the vacuum water tank, and performing exhaust treatment on the vacuum water tank and the bottomless valve centrifugal pump, wherein an exhaust mechanism vertically distributed in the vacuum water tank is in a movable state;
step 3, filling water into the vacuum water tank through a water inlet pipe of the water tank, and enabling the exhaust mechanism to be in a suspension state along with the increase of the water level in the vacuum water tank;
step 4, water in the vacuum water tank enters the centrifugal pump without the bottom valve through a water inlet pipe of the water pump, when a limiting rod at the upper end of the air bag floats out of an exhaust hole at the upper part of the vacuum water tank, the vacuum water tank is full of water, water filling is stopped, an exhaust bolt is screwed into the exhaust hole corresponding to the limiting rod at the upper end of the air bag, the exhaust bolt is screwed, and exhaust and first water filling operations are completed;
and 5, starting the centrifugal pump without the bottom valve, and starting the centrifugal pump without the bottom valve to work.
7. The use method of the water filling and air exhausting device of the centrifugal pump without the bottom valve as claimed in claim 6, further comprising: when the centrifugal pump without the bottom valve needs to be subjected to anti-freezing treatment, the drain plug in the drain hole is screwed out, and residual water in the vacuum water tank, the centrifugal pump without the bottom valve and a water inlet pipe of the water tank can be discharged; and repeating the steps 1-5 when the centrifugal pump without the bottom valve is used again.
CN201810055223.6A 2018-01-19 2018-01-19 Water filling and exhausting device of centrifugal pump without bottom valve and using method thereof Active CN108412813B (en)

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CN108412813B true CN108412813B (en) 2020-05-26

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CN101988507A (en) * 2009-07-30 2011-03-23 沈阳耐蚀合金泵股份有限公司 Suspended automatic gas release device with siphon can
CN103867480A (en) * 2012-12-09 2014-06-18 肖功宽 Energy-saving and low-carbon variable bottom-valve-free water-pumping method

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