CN110145468B - Method and device for maintaining negative pressure after water pump is stopped - Google Patents
Method and device for maintaining negative pressure after water pump is stopped Download PDFInfo
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- CN110145468B CN110145468B CN201910442710.2A CN201910442710A CN110145468B CN 110145468 B CN110145468 B CN 110145468B CN 201910442710 A CN201910442710 A CN 201910442710A CN 110145468 B CN110145468 B CN 110145468B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000004146 energy storage Methods 0.000 claims abstract description 54
- 230000006835 compression Effects 0.000 claims abstract description 30
- 238000007906 compression Methods 0.000 claims abstract description 30
- 210000004907 gland Anatomy 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims description 21
- 239000002775 capsule Substances 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000007779 soft material Substances 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
- F04D29/007—Details, component parts, or accessories 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
- F04D29/08—Sealings
- F04D29/086—Sealings 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
A method and device for keeping negative pressure in the pump after the water pump is stopped.A compression cover is sleeved on the pump shaft and positioned at the outer side of a sealing gland, an armature is fixedly arranged on the compression cover, an annular soft substance sealing body is arranged between the compression cover and the sealing gland, a compression cover guide rod is fixedly arranged in a water pump bearing body, an electromagnet corresponding to the armature is fixedly arranged in the water pump bearing body, and a reset spring is arranged between the compression cover and the electromagnet; an energy accumulator with an energy storage cavity and a pressure cavity is arranged above the pump body, a first connecting pipe is arranged between the outlet end of the water pump and the pressure cavity of the energy accumulator, and a second connecting pipe is arranged between the negative pressure area in the pump cavity and the energy storage cavity of the energy accumulator. The vacuumizing device is only used once when the water pump is started initially, so that the failure rate of the water pump is greatly reduced. After the water pump is stopped, the negative pressure in the pump body can be kept, namely, the vacuum degree required by the starting of the water pump is kept; when the water pump is started again, the instant starting and instant water feeding can be realized without vacuumizing.
Description
Technical Field
The invention belongs to a method and a device for maintaining negative pressure after a water pump on liquid stops, which can realize quick start without vacuumizing.
Background
The water supply and drainage system of the water pump is closely related to the life of people, and has extremely wide application range. The total installed quantity of the water pump in China exceeds ten millions, and the use quantity of the centrifugal pump on the liquid in the water pump family is more than 90% of the total quantity; the above-liquid centrifugal pump is a water pump with an impeller above the ground of a pump house. At present, a vacuum pumping starting mode is generally adopted for the submerged centrifugal pump. This mode of start-up has the following drawbacks.
1. Regardless of how the pump body and the pipeline are installed, the pump shaft of the water pump is airtight, and as for the whole water pump, no matter how perfect the airtight measure is, the system has fine leakage due to various objective and unpredictable factors. This leakage eventually results in a loss of vacuum in the pump. Before each water pump is started, a vacuum device is needed to be used for vacuumizing, and the mode is long in starting time and high in noise. The vacuum device has complicated structure, and besides a plurality of connecting pipelines and lines, an electric control system, a detection system, a water pump motor delay start and the like are also needed.
2. The vacuum device has the advantages of more pipelines, long pipe , repeated starting and high failure rate, and is extremely easy to damage the water pump, the vacuum device or the control system. The operation site of the pump house is very messy, which is unfavorable for civilized production and safe production.
3. After the water pump is stopped, no liquid exists in the pump, and the pump part is exposed in the air, so that the pump part is extremely easy to oxidize and corrode, and the service life of the water pump is influenced.
4. The equipment purchase and maintenance cost of the using unit is increased, and the daily equipment maintenance amount of operators is increased.
5. Is not beneficial to the automation and the intellectualization of the water supply and drainage system of the water pump.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method and a device for maintaining negative pressure after a water pump is stopped.
The technical scheme of the invention is as follows:
a method for maintaining negative pressure in a pump after the water pump is stopped comprises the following steps:
1. a water pump shaft sealing device is arranged on the outer side of the mechanical seal or packing seal 3 of the pump shaft 9, and is in a separation state when the water pump operates, namely, a gap is kept between the water pump shaft sealing device and the pump shaft, so that friction is prevented from occurring when the water pump operates, and normal rotation of the pump shaft 9 is not influenced; the water pump shaft sealing device is tightly pressed between the pump shaft 9 and the sealing gland 4 when the water pump is stopped, so that the pump cavity 11 is kept sealed with the outside;
2. an energy accumulator 2 with an energy storage cavity 207 and a pressure cavity 205 is adopted, a first connecting pipe 204 is arranged between the outlet end of a water pump and the pressure cavity 205 of the energy accumulator, and a second connecting pipe 201 is arranged between a negative pressure area in the pump cavity 11 and the energy storage cavity 207 of the energy accumulator;
3. before the water pump is started, a starting instruction of the water pump is sent, the water pump shaft sealing device is firstly opened and returns to the original position, and the water pump motor is started in a delayed mode;
4. when the water pump is operated, the pressure of the liquid at the outlet end of the water pump is utilized to enable the liquid discharged from the outlet end of the water pump to enter the pressure cavity 205 of the energy accumulator, the pressure cavity 205 is expanded, and the energy storage cavity 205 is deformed to store energy;
5. after the water pump is stopped, the pump shaft and the sealing gland are sealed through the water pump shaft sealing device, so that liquid and air in the pump are completely isolated;
because the valve at the front end of the water pump is closed, the negative pressure in the whole pump body is equal, the negative pressure is the negative pressure when the water pump is started, the energy stored by the energy storage device is released, the volume of the energy storage cavity 207 is increased, the vacuum degree in the pump cavity 11 is increased by delta P, the process is the same as the process of pumping the vacuum by a vacuum pump, the vacuum degree in the pump is increased by delta P, the vacuum degree lost in the pump due to the leakage of the pump system is counteracted by the increased vacuum degree delta P, and the vacuum degree in the pump cavity is increased;
5. when the water pump is started again, the water pump is started instantly without vacuumizing, and water is fed in instantly.
Further, the volume V1 of the accumulator is calculated according to the following formula:
V 1 ＝V*(0.05-0.06)*N；
V 1 : the volume of the accumulator; v: the volume of the water pump; n: the water pump needs to maintain the vacuum for days.
Further, the height of the inner bottom surface of the accumulator cylinder body is 0.3-0.5 m higher than the highest point in the pump cavity of the water pump.
Further, the separation and compression of the water pump shaft sealing device adopts an electromagnetic force driving mode.
Further, the water pump shaft sealing device comprises a pressing cover 1 sleeved on a pump shaft 9 and positioned at the outer side of a sealing gland 4, an armature 12 fixedly arranged on the pressing cover 1, an annular soft substance sealing body 5 arranged between the pressing cover 1 and the sealing gland 4, a pressing cover guide rod 8 fixedly arranged in a water pump bearing body 11, an electromagnet 6 fixedly arranged in a water pump bearing body 13 and corresponding to the armature, and a return spring 7 arranged between the pressing cover 1 and the electromagnet 6; the compression cover is sprung open by the return spring before the water pump operates.
Further, the energy accumulator is a piston type energy accumulator.
Further, the energy accumulator is a capsule type energy accumulator.
The utility model provides a keep device of negative pressure after water pump shut down, includes pump body 10, water pump bearing body 13, pump shaft 9 and the epaxial mechanical seal of setting or packing seal 3 and gland 4 of pump, its special character is: the pump shaft 9 is sleeved with the compression cover 1 outside the sealing gland 4, the compression cover 1 is fixedly provided with the armature 12, the annular soft material sealing body 5 is arranged between the compression cover 1 and the sealing gland 4, the compression cover guide rod 8 is fixedly arranged in the water pump bearing body 13, the compression cover 1 can move back and forth along the compression cover guide rod 8, the water pump bearing body 13 is internally fixedly provided with the electromagnet 6 corresponding to the armature, and the reset spring 7 is arranged between the compression cover 1 and the electromagnet 6; an accumulator 2 with an energy storage cavity 207 and a pressure cavity 205 is arranged above the pump body 10, a first connecting pipe 204 is arranged between the outlet end of the water pump and the pressure cavity 205 of the accumulator, and a second connecting pipe 201 is arranged between a negative pressure area in the pump cavity 11 and the energy storage cavity 207 of the accumulator.
Further, the accumulator includes a cylinder 203, a piston 206 is disposed in the cylinder 203, a space above the piston 206 in the cylinder is a pressure cavity, a space below the piston 206 is an energy storage cavity, an energy storage spring 202 is disposed in the energy storage cavity, and the piston 206 is seated on the energy storage spring 202.
Further, the energy accumulator comprises a cylinder 203, an energy storage capsule 208 is arranged in the cylinder 203, a space in the energy storage capsule 208 is a pressure cavity 205, and a space outside the energy storage capsule in the cylinder is an energy storage cavity 207.
Further, the energy storage capsule is suspended within the cylinder.
The beneficial effects of the invention are as follows:
1. the vacuumizing device is only used once when the water pump is started initially, so that the failure rate of the water pump is greatly reduced. After the water pump is stopped, the negative pressure in the pump body can be kept, namely, the vacuum degree required by the starting of the water pump. When the water pump is started again, the instant starting and instant water feeding can be realized without vacuumizing.
2. After the water pump is stopped, the negative pressure can be kept in the pump body, liquid is stored in the pump body, the pump part is prevented from being exposed in the air, the pump part is not easy to oxidize and corrode, and the service life of the water pump is prolonged.
3. The equipment purchasing and maintenance cost of the using units is reduced, and the daily equipment maintenance amount of operators is reduced.
4. The system can be remotely monitored and unattended, and is favorable for realizing the automation and the intellectualization of the water supply and drainage system of the water pump.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
fig. 2 is a schematic structural view of embodiment 2 of the present invention.
In the figure: 1. the hydraulic pump comprises a compression cover, an accumulator, a mechanical seal, a sealing gland, a soft matter sealing body, an electromagnet, a reset spring, a compression cover guide rod, a pump shaft, a pump body, a pump cavity, an armature, a water pump bearing body, a connecting pipe II, a connecting pipe 202, an energy storage spring, a cylinder body, a connecting pipe 204, a connecting pipe 205, a pressure cavity, a piston 206, an energy storage cavity 207 and an energy storage capsule 208.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples.
Example 1
As shown in fig. 1, a device for maintaining negative pressure after a water pump is stopped comprises a pump body 10, a water pump bearing body 13, a pump shaft 9, a mechanical seal 3 and a sealing gland 4 which are arranged on the pump shaft 9, wherein a pressing cover 1 is sleeved on the pump shaft 9 and positioned outside the sealing gland 4, an armature 12 is fixedly arranged on the pressing cover 1, and in the embodiment, the armature 12 is embedded on the pressing cover 1. An annular soft material sealing body 5 is arranged between the compression cover 1 and the sealing gland 4, the annular soft material sealing body 5 is made of rubber, a compression cover guide rod 8 is fixedly arranged in a water pump bearing body 13, the compression cover guide rod 8 penetrates through the compression cover 1, the compression cover 1 can move back and forth along the compression cover guide rod 8, an electromagnet 6 corresponding to an armature 12 is fixedly arranged in the water pump bearing body 13, and in the embodiment, the electromagnet 6 is arranged on the sealing gland 4. A return spring 7 is arranged between the compression cover 1 and the electromagnet 6; a piston type energy accumulator 2 is arranged above the pump body 10, the energy accumulator 2 comprises a cylinder 203, a piston 206 is arranged in the cylinder 203, a space above the piston 206 in the cylinder is a pressure cavity 205, a space below the piston 206 is an energy storage cavity 207, and an energy storage spring 202 is arranged between the bottom surface of the energy storage cavity 207 and the lower surface of the piston 206. The upper end surface and the lower end surface of the cylinder 203 are respectively provided with an upper pipe orifice communicated with the pressure cavity 205 and a lower pipe orifice communicated with the energy storage cavity 207.
The method for maintaining the negative pressure after the water pump is stopped comprises the following specific steps:
1. a water pump shaft sealing device is arranged on the outer side of the mechanical seal 3 of the pump shaft 9, and is in a separation state when the water pump operates, namely, a gap is kept between the water pump shaft sealing device and the pump shaft 9, so that friction is prevented when the water pump operates, and normal rotation of the pump shaft 9 is not influenced; the water pump shaft head sealing device is tightly pressed between the pump shaft 9 and the sealing gland 4 when the water pump is stopped, so that the pump cavity 11 is kept sealed with the outside;
2. the piston type energy accumulator 2 with the structure is arranged above the water pump, and a first connecting pipe 204 is arranged between the outlet end of the water pump and the upper pipe orifice of the energy accumulator 2; a second connecting pipe 201 is arranged between the negative pressure area in the pump cavity 11 and the lower pipe orifice of the energy accumulator 2;
3. before the water pump is started, a starting instruction of the water pump is sent, the electromagnet 6 is powered off, and the compression cover 1 and the sealing gland 4 are separated and returned to the original position under the action of the reset spring 7; the water pump motor is started in a delayed mode;
4. when the water pump is operated, the pressure of the liquid at the outlet end of the water pump is utilized to enable the liquid discharged from the outlet end of the water pump to enter a pressure cavity 205 of the energy accumulator, the pressure cavity 205 is expanded, a piston 206 moves to the lower end position of the cylinder body of the energy accumulator, and an energy storage spring 202 compresses and stores energy, and meanwhile, the volume of an energy storage cavity 207 is reduced;
5. after a water pump stop instruction is sent, the water pump motor stops running, the electromagnet 6 is electrified after time delay, the compression cover 1 and the sealing gland 4 are tightly pressed together with the annular soft substance sealing body 5 under the action of electromagnetic force, the pump shaft head sealing device is used for sealing between the pump shaft 9 and the sealing gland 4, the end face of the sealing gland 4 and the pump shaft 9 are compressed by the soft substance sealing body 5, liquid in the pump body 10 is completely isolated from air, and liquid leakage cannot occur.
Because the valve at the front end of the water pump is closed, the pressure at the outlet end of the water pump and the pressure at the inlet end tend to be balanced, and the negative pressure in the whole pump body is equal and is the negative pressure when the water pump is started, so that a certain vacuum degree P is formed 0 The method comprises the steps of carrying out a first treatment on the surface of the The energy stored by the energy storage spring 202 is released, the piston 206 is moved to the upper end position of the energy storage cylinder 203, the volume of the energy storage cavity 207 is increased, the vacuum degree in the pump cavity 11 is increased by delta P, the process is equivalent to the process of vacuumizing the pump body by a vacuum pump, and the increased vacuum degree delta P is used for counteracting the vacuum degree lost in the pump body due to the leakage of the pump body; under the action of delta P, the vacuum degree in the pump cavity of the whole water pump is increased to P 0 The +DeltaP can improve the liquid level in the pump body compared with the stopping moment of the water pump, and ensure that the water pump can be started directly next time.
6. When the water pump is started again, the water pump is started instantly without vacuumizing, and water is fed in instantly.
Further, the volume V1 of the accumulator is calculated according to the following formula:
V 1 ＝V*(0.05-0.06)*N；
V 1 : the volume of the accumulator; v: the volume of the water pump; n: the water pump needs to maintain the vacuum for days.
Further, the height of the bottom surface in the accumulator cylinder body is 0.3-0.5 m higher than the highest point in the pump cavity of the water pump, and the height is 0.4 m higher in the embodiment.
Further, the water pump shaft head sealing device is separated from the electromagnetic force and is tightly pressed.
Example 2
The device for keeping negative pressure after the water pump is stopped, which has the same structure as that of the embodiment 1, is adopted, the energy accumulator 2 is a capsule type energy accumulator, the energy accumulator 2 comprises a cylinder 203, an energy storage capsule 208 is suspended in the cylinder 203, the space in the energy storage capsule 208 is a pressure cavity 205, and the space in the cylinder 203, which is positioned outside the energy storage capsule 208, is an energy storage cavity 207. An upper nozzle and a lower nozzle which are respectively communicated with the pressure chamber 205 and the energy storage chamber 207 are arranged on the cylinder 203.
The method for maintaining the negative pressure after the water pump is stopped comprises the following specific steps:
1. the outside of the mechanical seal 3 of the pump shaft 9 is provided with a water pump shaft head sealing device which is in a separation state when the water pump operates, namely, a gap is kept between the water pump shaft head sealing device and the pump shaft 9, friction is prevented from occurring when the water pump operates, and normal rotation of the pump shaft 9 is not influenced; the water pump shaft head sealing device is tightly pressed between the pump shaft 9 and the sealing gland 4 when the water pump is stopped, so that the pump cavity 11 is kept sealed with the outside;
2. the capsule type energy accumulator 2 with the structure is characterized in that a first connecting pipe 204 is arranged between the outlet end of the water pump and the upper pipe orifice of the energy accumulator; a second connecting pipe 201 is arranged between the negative pressure area in the pump cavity 11 and the lower pipe orifice of the energy accumulator 2;
3. before the water pump is started, a starting instruction of the water pump is sent, the sealing device of the shaft head of the water pump is firstly opened and returned to the original position, and the motor of the water pump is started in a delayed mode;
4. when the water pump is operated, the pressure of the liquid at the outlet end of the water pump is utilized to enable the liquid discharged from the outlet end of the water pump to enter the pressure cavity 205 of the energy accumulator, so that the energy storage capsule is filled with the liquid and expanded to occupy the volume of most of the cylinder body of the energy accumulator, and meanwhile, the volume of the energy storage cavity 207 is reduced, and the capsule material stretches and stores energy.
5. After the water pump is stopped, the pump shaft head sealing device seals the pump shaft and the sealing gland, so that the liquid and the air in the pump body are completely isolated;
because the valve at the front end of the water pump is closed, the pressure at the outlet end of the water pump and the pressure at the inlet end tend to be balanced, and the negative pressure in the whole pump body is equal and is the negative pressure when the water pump is started, so that a certain vacuum degree P is formed 0 The method comprises the steps of carrying out a first treatment on the surface of the At this time, the energy stored in the energy storage capsule is released, that is, the energy storage capsule starts to shrink, the volume of the pressure cavity 205 is reduced, the volume of the energy storage cavity 207 is increased, the vacuum degree is increased by Δp, the vacuum degree in the whole pump cavity 11 of the water pump is increased to p0+Δp, the liquid level in the pump body is increased compared with the water pump stopping moment, and the next water pump can be directly started. The process is equivalent to pumping the pump body by a vacuum pumpThe increased vacuum Δp is used to offset the loss of vacuum in the pump body due to pump leakage, as in the vacuum process.
6. When the water pump is started again, the water pump is started instantly without vacuumizing, and water is fed in instantly.
The other steps are the same as in example 1.
The mechanical seal 3 in the above-described embodiment 1 and embodiment 2 is replaced with a packing seal.
The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for maintaining negative pressure in a pump after the water pump is stopped is characterized by comprising the following steps: the method comprises the following steps:
1) The water pump shaft sealing device is arranged on the outer side of a mechanical seal or packing seal of the pump shaft and comprises a compression cover sleeved on the pump shaft and positioned on the outer side of a sealing gland, an armature fixedly arranged on the compression cover, an annular soft material sealing body arranged between the compression cover and the sealing gland, a compression cover guide rod fixedly arranged in a water pump bearing body, an electromagnet fixedly arranged in the water pump bearing body and corresponding to the armature, and a return spring arranged between the compression cover and the electromagnet; the compressing cover is sprung open by the reset spring before the water pump operates; the water pump shaft sealing device is in a separation state when the water pump operates, namely, a gap is kept between the water pump shaft sealing device and the pump shaft, friction is prevented from occurring when the water pump operates, and normal rotation of the pump shaft is not influenced; the water pump shaft sealing device is tightly pressed between the pump shaft and the sealing gland when the water pump is stopped, so that the pump cavity is kept sealed with the outside;
2) The energy accumulator comprises a cylinder body, a piston is arranged in the cylinder body, a space above the piston in the cylinder body is the pressure cavity, a space below the piston is the energy storage cavity, an energy storage spring is arranged in the energy storage cavity, and the piston is arranged on the energy storage spring; or the energy accumulator comprises a cylinder body, an energy storage capsule is arranged in the cylinder body, the space in the energy storage capsule is a pressure cavity, the space in the cylinder body, which is positioned outside the energy storage capsule, is an energy storage cavity, and the energy storage capsule is suspended in the cylinder body;
a first connecting pipe is arranged between the outlet end of the water pump and the pressure cavity of the energy accumulator, and a second connecting pipe is arranged between the negative pressure area in the pump cavity and the energy storage cavity of the energy accumulator;
3) Before the water pump is started, a starting instruction of the water pump is sent, the water pump shaft sealing device is firstly opened and returns to the original position, and the water pump motor is started in a delayed mode;
4) When the water pump operates, the pressure of the liquid at the outlet end of the water pump is utilized to enable the liquid discharged from the outlet end of the water pump to enter a pressure cavity of the energy accumulator, and the pressure cavity expands to enable the energy storage cavity to deform for energy storage;
5) After the water pump is stopped, the pump shaft and the sealing gland are sealed through the water pump shaft sealing device, so that liquid and air in the pump are completely isolated;
because the valve at the front end of the water pump is closed, the negative pressure in the whole pump body is equal, the negative pressure is the negative pressure when the water pump is started, the energy stored by the energy storage device is released, the volume of the energy storage cavity is increased, the vacuum degree in the pump cavity is increased by delta P, the process is the same as the process of pumping the pump by using a vacuum pump, the increased vacuum degree delta P is used for counteracting the vacuum degree lost in the pump due to the leakage of the pump system, and the vacuum degree in the pump cavity is increased;
6) When the water pump is started again, the water pump is started instantly without vacuumizing, and water is fed in instantly.
2. The method for maintaining negative pressure in a pump after stopping the pump according to claim 1, wherein the method comprises the steps of: the volume V1 of the accumulator is calculated according to the following formula:
V 1 =V*（0.05-0.06）*N；
V 1 : the volume of the accumulator; v: the volume of the water pump; n: the water pump needs to maintain the vacuum for days.
3. The method for maintaining negative pressure in a pump after stopping the pump according to claim 1, wherein the method comprises the steps of: the height of the bottom surface in the accumulator cylinder body is 0.3-0.5 meter higher than the highest point in the pump cavity of the water pump.
4. The method for maintaining negative pressure in a pump after stopping the pump according to claim 1, wherein the method comprises the steps of: the separation and compaction of the water pump shaft sealing device adopts an electromagnetic force driving mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910442710.2A CN110145468B (en) | 2019-05-25 | 2019-05-25 | Method and device for maintaining negative pressure after water pump is stopped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910442710.2A CN110145468B (en) | 2019-05-25 | 2019-05-25 | Method and device for maintaining negative pressure after water pump is stopped |
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| Publication Number | Publication Date |
|---|---|
| CN110145468A CN110145468A (en) | 2019-08-20 |
| CN110145468B true CN110145468B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910442710.2A Active CN110145468B (en) | 2019-05-25 | 2019-05-25 | Method and device for maintaining negative pressure after water pump is stopped |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB707521A (en) * | 1952-07-26 | 1954-04-21 | Bour Company Inc | Improvements in or relating to leakage control for centrifugal pump shaft seals |
| JPH03124997A (en) * | 1989-10-05 | 1991-05-28 | Maoka Sekkei:Kk | Method for utilizing self-suction pump as vacuum pump and device thereof |
| CN206830463U (en) * | 2017-06-22 | 2018-01-02 | 西安文理学院 | A kind of SCM Based vacuum self priming pump |
| CN109751277A (en) * | 2019-02-27 | 2019-05-14 | 沈阳北碳密封有限公司 | Self priming pump positive/negative-pressure operating condition mechanical seal |
| CN210050048U (en) * | 2019-05-25 | 2020-02-11 | 锦州重型水泵有限公司 | Device for keeping negative pressure after water pump is stopped |
-
2019
- 2019-05-25 CN CN201910442710.2A patent/CN110145468B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB707521A (en) * | 1952-07-26 | 1954-04-21 | Bour Company Inc | Improvements in or relating to leakage control for centrifugal pump shaft seals |
| JPH03124997A (en) * | 1989-10-05 | 1991-05-28 | Maoka Sekkei:Kk | Method for utilizing self-suction pump as vacuum pump and device thereof |
| CN206830463U (en) * | 2017-06-22 | 2018-01-02 | 西安文理学院 | A kind of SCM Based vacuum self priming pump |
| CN109751277A (en) * | 2019-02-27 | 2019-05-14 | 沈阳北碳密封有限公司 | Self priming pump positive/negative-pressure operating condition mechanical seal |
| CN210050048U (en) * | 2019-05-25 | 2020-02-11 | 锦州重型水泵有限公司 | Device for keeping negative pressure after water pump is stopped |
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| Publication number | Publication date |
|---|---|
| CN110145468A (en) | 2019-08-20 |
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