CN117307532A - Water pump liquid inlet water seal pipe section, water pumping device and installation size determining method of water pumping device - Google Patents
Water pump liquid inlet water seal pipe section, water pumping device and installation size determining method of water pumping device Download PDFInfo
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- CN117307532A CN117307532A CN202210703679.5A CN202210703679A CN117307532A CN 117307532 A CN117307532 A CN 117307532A CN 202210703679 A CN202210703679 A CN 202210703679A CN 117307532 A CN117307532 A CN 117307532A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 506
- 239000007788 liquid Substances 0.000 title claims abstract description 184
- 238000009434 installation Methods 0.000 title claims abstract description 47
- 238000005086 pumping Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 15
- 210000002445 nipple Anatomy 0.000 claims description 19
- 230000007935 neutral effect Effects 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 7
- 238000004513 sizing Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000007639 printing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000003466 welding Methods 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
- F04D29/40—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
-
- 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
- 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
- F04D29/4293—Details of fluid inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention discloses a water inlet seal pipe section of a water pump, a water pumping device and a method for determining the installation size of the water pumping device. The water seal pipe section comprises a first elbow, a horizontal pipe joint, a second elbow, a vertical pipe joint and a third elbow which are sequentially and hermetically connected to form a water seal pipe section body a with a communicated water containing space; one end of the water seal pipe section body a is higher than the other end, one end of the water seal pipe section body a, which is higher in position, is higher than the water source liquid level and is communicated with a water-neutral pipe inserted into water in a sealing way, one end of the water seal pipe section body a, which is lower in position, is communicated with a horizontal liquid inlet pipe in a sealing way through a flange mounting assembly, the heights of the two ends of the water seal pipe section body a are both lower than the overflow surfaces of the water seal pipe section body a, and the distance between the lower end of the water seal pipe section body a and the overflow surfaces is larger than the distance between the upper end of the water seal pipe section body a and the overflow surfaces, so that water pumped in the water pumping process does not flow back to the water source through the water seal pipe section body a. The water seal pipe section has no valve internal parts, so that the flow friction resistance is greatly reduced, scaling and blocking phenomena are reduced, and the sealing performance is good.
Description
Technical Field
The invention relates to the technical field of water supply and drainage engineering, in particular to a water pump liquid inlet water seal pipe section, a water pump device and a method for determining the installation size of the water pump liquid inlet water seal pipe section.
Background
In water supply and drainage engineering, water is generally required to be transported. The water is transported from one place to another by means of a pump. Typically, when the water intake level is below the inlet pipe of the water pump, the water intake end of each centrifugal pump is fitted with a submerged bottom valve. The bottom valve is actually a kind of check valve, and plays a role in preventing water backflow, namely when the pump stops working for a short time, the bottom valve can ensure that liquid can not return to a water source, and can ensure that the inlet pipe of the centrifugal pump is filled with liquid, so that the next start of the pump is facilitated.
The existing underwater bottom valve is fixedly arranged in water, and the valve body is easy to scale, block and corrode due to long-term soaking; if sewage or chemical substances are conveyed, scaling is more serious, corrosion is accelerated, overhaul is difficult, and safety risks exist.
The water-borne bottom valve is characterized in that a part of the underwater bottom valve is replaced, the valve body is arranged on the water surface, and the overhaul is convenient. However, such a water-borne bottom valve has a high resistance to fluid; if the water is sewage or contains other chemical substances, the problems of corrosion, scaling, insensitive action and the like of the bottom valve are more serious. This also increases the running costs in the water supply and drainage process to a great extent.
Disclosure of Invention
Aiming at the problems of a bottom valve arranged at the water inlet end of a centrifugal pump in the existing water supply and drainage engineering, the invention aims to provide a water pump liquid inlet water seal pipe section, a water pumping device of the water pump liquid inlet water seal pipe section and a method for determining the installation size of the water pumping device, thereby reducing the flow resistance of water inlet, reducing scaling and blocking phenomena, having a sealing effect and meeting the installation and use requirements.
The invention is realized by the following technical scheme:
the first object of the invention is to provide a liquid inlet water seal pipe section of a water pump, which comprises a first elbow, a second elbow and a third elbow, wherein a horizontal pipe joint is arranged between the first elbow and the second elbow, a vertical pipe joint is arranged between the second elbow and the third elbow, and the first elbow, the horizontal pipe joint, the second elbow, the vertical pipe joint and the third elbow are sequentially and hermetically connected to form a water seal pipe section body a with a communicated water containing space;
one end of the water seal pipe section body a is higher than the other end, one end of the water seal pipe section body a, which is higher than the water source liquid level, is in sealing communication with a water neutral pipe inserted into water, one end of the water seal pipe section body a, which is lower than the water seal pipe section body a, is in sealing communication with a horizontal liquid inlet pipe through a flange mounting assembly, the heights of the two ends of the water seal pipe section body a are lower than the overflow surfaces of the water seal pipe section body a, and the distance between the lower end of the water seal pipe section body a and the overflow surfaces is greater than the distance between the upper end of the water seal pipe section body a and the overflow surfaces, so that water pumped in the water pumping process does not flow back to the water source through the water seal pipe section body a.
In an alternative embodiment, the sizes of the elbows are equal, and the first elbow and the second elbow are symmetrically arranged at two sides of the horizontal pipe joint;
the diameters of the inner pipes of the first elbow, the horizontal pipe joint, the second elbow, the vertical pipe joint and the third elbow are equal;
each elbow is a long-radius elbow, and four elbows form a circular ring;
the length of the horizontal pipe joint is more than or equal to 0; the length of the vertical pipe joint is greater than or equal to that of the horizontal pipe joint, and the length of the vertical pipe joint is not equal to 0; when the liquid enters the water seal pipe section body and the liquid level reaches the overflow surface of the water seal pipe section body, the volume of the space occupied by the liquid in the water seal pipe section body is larger than or equal to the volume of the space not occupied by the liquid.
In an alternative embodiment, the flange mounting assembly comprises a flange nipple and a flange, the flange nipple and the flange form a water seal pipe section body b, and the lower end of the water seal pipe section body a, the flange nipple and the flange are sequentially connected in a sealing mode.
The second object of the present invention is to provide a water pumping device, comprising a water pump liquid inlet water seal pipe section as defined in any one of claims 1 to 3, further comprising a water vertical pipe, a horizontal liquid inlet pipe, a liquid inlet valve, a liquid inlet pipe pressure gauge, a liquid filling valve, a horizontal liquid inlet pipe, a water pump, and an exhaust piece, wherein the water vertical pipe is in sealing connection with the first elbow, the horizontal liquid inlet pipe is in sealing connection with the water seal pipe section body b, the liquid inlet valve is installed at the end of the horizontal liquid inlet pipe, the liquid inlet pipe pressure gauge and the liquid filling valve are fixedly installed on the horizontal liquid inlet pipe, and the end of the horizontal liquid inlet pipe is communicated with the water pump.
In an optional embodiment, the inner diameter of the water neutral pipe is equal to or larger than the inner diameter of the liquid inlet of the water pump, and the inner diameter of the water seal pipe section body, the inner diameter of the horizontal liquid inlet pipe and the inner diameter of the horizontal liquid inlet short pipe are all larger than the inner diameter of the liquid inlet of the water pump;
the height of the installation height calculation standard surface of the water seal pipe section is smaller than the maximum allowable installation height of the water pump, and the installation height calculation standard surface of the water seal pipe section is the sum of the height above the horizontal plane in the underwater vertical pipe and the curvature radius of the first elbow;
all water volume V between overflow surface of water seal pipe section body and water pump inlet flange s The water volume V between the water level in the underwater vertical pipe and the overflow surface of the water seal pipe section body is larger than or equal to w 3 times of (3);
the overflow surface of the water seal pipe section body is equal to or higher than the overflow port of the exhaust piece, and the exhaust piece is equal to the highest part of the water pump body in height.
In an alternative embodiment, the device further comprises a liquid outlet pipe pressure gauge, a check valve, a liquid outlet valve and a liquid outlet pipe which are connected in sequence;
the exhaust part is an exhaust valve and/or a drain pipe overflow valve, and the exhaust valve is arranged on the water pump;
the drain pipe overflow valve and the drain pipe pressure gauge are both arranged on a pipeline connected with the water outlet end of the water pump and the check valve.
A third object of the present invention is to provide the method for determining the installation size of the water pumping device, comprising:
(1) Acquiring technical parameters of a water pump;
(2) Initial position: setting the installation positions of the water pump, the underwater vertical pipe and the water seal pipe section body according to the technical parameters of the water pump according to the installation site;
(3) Determining the size:
according to the principle of determining the diameter of the liquid inlet and the structural size of the water pump, the diameter d of the water riser is determined 2 Diameter d of water seal pipe section body, horizontal liquid inlet pipe and horizontal liquid inlet short pipe 348 ；
According to the initial position of the water pump, the underwater vertical pipe and the water seal pipe section body, determining the height h above the water level in the underwater vertical pipe 2 Length L of horizontal pipe section 16 Length L of vertical pipe section 20 Short length L of flange 22 Curvature radius A of each elbow;
calculating the total water volume V between the overflow surface of the water seal pipe section body and the flange of the water inlet of the water pump s Water volume V of water free space between water level in water neutral pipe and overflow surface of water sealed pipe w ；
According to V s And V is equal to w Determining the minimum total length L of the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe 48 。
In an alternative embodiment, the V s ≥3V w When said V s ＝3V w When the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe are in a closed state, the minimum total length L of the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe is obtained 48 。
In an alternative embodiment, the method also comprises determining the maximum allowable installation height H of the water pump according to the length L of the pipe section (namely the total length L of the liquid inlet pipe section) Szmax According to H Szmax Determining the installation height of the water seal pipe section body and calculating the standard surface height h 17 。
In an alternative embodiment, the maximum allowable mounting height H of the water pump Szmax The determining method of (1) comprises the following steps:
H Szmax ≤[H S ]－(∑h S +v S 2 /2g)；
wherein: [ H ] S ]The allowable suction vacuum degree specified for the water pump production factory; sigma h S Hydraulic loss for suction pipe; v S 2 2g is the flow speed head loss of the suction inlet of the water pump; v S Is the average flow rate of the suction inlet; g is gravity acceleration;
∑h S ＝λ·(L/D)·v S 2 /(2g)+(∑ζ)·v S 2 /(2g)；
wherein: lambda (L/D) v S 2 (2 g) is the pipeline on-way resistance loss; (Σζ.v) S 2 (2 g) is the sum of the local resistance losses of the pipeline; lambda is the along-the-way resistance coefficient; l is the length of the pipe section, namely the total length of the liquid inlet pipe section, and L=the height h above the liquid level in the water vertical pipe 2 Total length of three elbows (pi×A×2) × (3/4) +horizontal pipe section length L in +water seal pipe section body 16 Length of +vertical pipe section L 20 Length of flange nipple L 22 Minimum total length L of + horizontal feed pipe 4 and horizontal feed pipe nipple 8 48 (rice); v S Average flow rate (meters per second) for the cross-section water flow of the pipeline; d, calculating the inner diameter (meters) of the pipeline; ζ is the local hydraulic loss coefficient of the pipeline.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the embodiment of the invention, the water inlet liquid water seal pipe section of the water pump is arranged, and belongs to a newer product of the bottom valve, and the water seal pipe section is arranged at the turning part of the vertical pipe with the water inlet pipe exposed on the water surface, so that all components in the bottom valve are omitted, the flowing friction resistance is extremely small, and the energy is saved by 70-90% compared with the water-borne bottom valve; the scaling and blocking phenomena are reduced; the maintenance times are reduced, so that the cost and the equipment operation cost are reduced, the water seal effect is achieved, the sealing performance is good, and the problem of water dripping and leaking does not exist. The water pumping device and the installation size determining method thereof provided by the embodiment of the invention ensure that the installation of the water sealing pipe section and the water pump meets the use requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a water inlet seal pipe section of a water pump according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of another structure of a water inlet seal pipe section of a water pump according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an installation process flow of a water pumping device according to an embodiment of the present invention.
The components in the drawings and corresponding marks are as follows:
the water pump comprises a 1-water surface, a 2-water vertical pipe, a 3-water seal pipe section body, a 4-horizontal liquid inlet pipe, a 5-liquid inlet valve, a 6-liquid inlet pipe pressure gauge, a 7-liquid filling valve, an 8-horizontal liquid inlet short pipe, a 9-water pump, a 10-exhaust valve, an 11-liquid outlet pipe pressure gauge, a 12-check valve, a 13-liquid outlet valve, a 14-liquid outlet pipe, a 15-first elbow, a 16-horizontal pipe section, a 17-water seal pipe section mounting height calculation standard surface, a 18-second elbow, a 19-water seal pipe section body overflow surface, a 20-vertical pipe section, a 21-third elbow, a 22-flange short joint, a 23-flange, a 24-raw water pump mounting height calculation standard surface, a 25-U-shaped elbow, a 26-water pump liquid outlet flange, a 27-water pump liquid inlet flange and a 28-liquid outlet pipe overflow valve.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1: water pump feed liquor water seal pipeline section
The water pump feed liquor water seal pipeline section of this embodiment includes: a horizontal pipe joint 16 is arranged between the first elbow 15 and the second elbow 18, and the horizontal pipe joint 16 is horizontally arranged; a vertical pipe joint 20 is arranged between the second elbow 18 and the third elbow 21, and the vertical pipe joint 20 is vertically arranged; the first elbow 15, the horizontal pipe joint 16, the second elbow 18, the vertical pipe joint 20 and the third elbow 21 are sequentially connected in a sealing way and are hollow tubular structures, so that a water seal pipe section body a with a communicated water containing space is formed;
one end of the water seal pipe section body a is higher than the other end, namely the height of the first elbow 15 at the space position is higher than the height of the third elbow 21 at the space position, the higher end of the water seal pipe section body a (namely one end of the first elbow 15) is higher than the water level of a water source and is in sealed communication with the underwater vertical pipe 2 inserted into water, one end of the underwater vertical pipe 2 is inserted into the water source, the other end of the underwater vertical pipe 2 is positioned above the water source, and the underwater vertical pipe 2 is vertically arranged in the space; one end (namely one end of the third elbow 21) of the water seal pipe section body a, which is lower, is communicated with the horizontal liquid inlet pipe 4 in a sealing way through a flange installation assembly, and the flange installation assembly and the horizontal liquid inlet pipe 4 are arranged in the horizontal direction. The heights of the two ends of the water seal pipe section body a are lower than the overflow surfaces 19 of the water seal pipe section body a, the overflow surfaces 19 of the water seal pipe section body a are the flush level of the inner pipe wall with the lower height of the horizontal pipe section 16, and if the water flow passes through the overflow surfaces 19, the water flow enters the horizontal pipe section 16 and flows back to a water source; the length of the horizontal pipe section 16 is 0 or more, preferably 0 or more (the specific structure is shown in fig. 1); thus, the first elbow 15, the horizontal pipe joint 16, the second elbow 18, the vertical pipe joint 20 and the third elbow 21 integrally form a U-shaped structure, and the U-shaped structure has an ascending bent angle structure and a descending bent angle structure, so that water flow can smoothly pass through the water pipe from ascending to descending, and due to the arrangement of the ascending bent angle and the descending bent angle, the distance between the lower end of the water seal pipe section body a (namely, the end of the third elbow 21, which is close to the flange mounting assembly) and the horizontal direction of the overflow surface 19 is larger than the distance between the upper end (namely, the end of the first elbow 15, which is close to the underwater riser 2) and the horizontal direction of the overflow surface 19, and the U-shaped structure can be used for setting a high barrier for water backflow, thereby playing the role of water seal, playing the role of water stop valve, and having good sealing performance, so that water pumped in the water pumping process does not flow back to the water source through the water seal pipe section body a.
Wherein, when the length of the horizontal pipe section 16 is equal to 0, a U-shaped elbow 25 can be used to replace a part of the water surface 1 of the underwater riser 2, the first elbow 15, the horizontal pipe section 16, the second elbow 18 and the vertical pipe section 20, and the specific structure is shown in fig. 2.
Further, the sizes and shapes of the elbows are equal, and the first elbow 15 and the second elbow 18 are symmetrically arranged at two sides of the horizontal pipe joint 16; the diameters of the inner pipes of the first elbow 15, the horizontal pipe joint 16, the second elbow 18, the vertical pipe joint 20 and the third elbow 21 are equal; the ports of the pipes are aligned, so that the contact surfaces are flush, and the resistance of water flow is reduced.
Further, each elbow is a long-radius elbow, and four elbows form a circular ring; the length of the vertical pipe section is greater than or equal to the length of the horizontal pipe section, and the length of the vertical pipe section is not equal to 0. If the length of the horizontal pipe section is equal to that of the vertical pipe section, when the liquid enters the water seal pipe section body 3 and the liquid level reaches the overflow surface 19 of the water seal pipe section body 3, the volume of the space occupied by the liquid in the water seal pipe section body 3 is equal to that of the space not occupied by the liquid; if the vertical pipe section length is greater than the horizontal pipe section length, when the liquid enters the water seal pipe section body 3 and the liquid level reaches the overflow surface 19 of the water seal pipe section body 3, the volume of the space occupied by the liquid in the water seal pipe section body 3 is greater than the volume of the space not occupied by the liquid. The arrangement can further improve the reliability of preventing water backflow and improve the sealing performance of the water seal pipe section.
Still further, the flange installation component includes flange nipple 22, flange 23, flange nipple 22, flange 23 constitute water seal pipeline section body b, flange nipple 22 be located water seal pipeline section body a lower extreme with between the flange 23, water seal pipeline section body a's lower extreme (i.e. the one end of third elbow 21), flange nipple 22, flange 23 seal connection in proper order, and wherein flange nipple 22 level sets up. The water-sealed pipe section body b and the water-sealed pipe section body a together form a water-sealed pipe section body 3.
The water neutral pipe 2 is connected with one end of the horizontal pipe section body 3, and the other end of the horizontal pipe section body 3 is connected with the horizontal liquid inlet pipe 4 through a flange 23 to form a liquid inlet channel.
When the water pump is used, before the water pump is started for the first time, after the water is filled into the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 through the liquid filling valve 7 in the whole water pump device, the water pump is started immediately, water in the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 is sucked away, a semi-vacuum area is formed in the water vertical pipe 2, and at the moment, water in a water tank enters the water vertical pipe 2, the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 under the action of atmospheric pressure, so that the water pumping process is completed. After the water pumping is finished, the pump is stopped, and the water in the water neutral pipe 2, the water seal pipe section body 3 and the horizontal liquid inlet pipe 4 can not flow back into the pool due to the siphon phenomenon.
According to the embodiment of the invention, the water inlet seal pipe section of the water pump is arranged, and the water seal pipe section belongs to a newer product of a bottom valve and is arranged at the turning position of the vertical pipe 2 of the water inlet pipe exposed on the water surface 1. The water seal pipe section is actually a pipe fitting component, all components in the bottom valve are eliminated, the flow friction resistance is extremely low, and the energy is saved by 70-90% compared with the water-borne bottom valve; the scale and the blockage are avoided; and because the sealing gasket between the valve cover and the valve body of the water-based bottom valve is not easy to age and the sealing gasket between the valve core and the valve seat is not easy to damage, the maintenance is saved, the cost and the running cost are reduced, and the safety and environmental protection risks are reduced. Meanwhile, the water seal pipe section has a water seal effect, is good in sealing performance, and does not have the problem of water dripping.
Example 2:
the water pumping device comprises the water pump liquid inlet water seal pipe section according to the embodiment 1, and further comprises a water neutral pipe 2, a horizontal liquid inlet pipe 4, a liquid inlet valve 5, a liquid inlet pipe pressure gauge 6, a liquid filling valve 7, a horizontal liquid inlet short pipe 8, a water pump 9 and an exhaust piece, wherein the water neutral pipe 2 is in sealing connection with a first elbow 15, the horizontal liquid inlet pipe 4 is in sealing connection with a water seal pipe section body b, the liquid inlet valve 5 is arranged at the tail end of the horizontal liquid inlet pipe 4, the liquid inlet pipe pressure gauge 6 and the liquid filling valve 7 are fixedly arranged on the horizontal liquid inlet short pipe 8, and the tail end of the horizontal liquid inlet short pipe 8 is communicated with the water pump 9.
The device also comprises a liquid outlet pipe pressure gauge 11, a check valve 12, a liquid outlet valve 13 and a liquid outlet pipe 14 which are connected in sequence; a communication pipeline is arranged between the water pump 9 and the check valve 12, and a liquid outlet pipe pressure gauge 11 is arranged on the communication pipeline; in addition, a water pump liquid inlet flange 27 and a water pump liquid outlet flange 26 are respectively arranged at the front end of the water pump liquid inlet and the rear end of the liquid outlet.
The inner diameter of the underwater riser 2 is equal to or larger than the inner diameter of the liquid inlet of the water pump 9, so that the water flow resistance is reduced; the inner diameter of the water seal pipe section body 3, the inner diameter of the horizontal liquid inlet pipe 4 and the inner diameter of the horizontal liquid inlet short pipe 8 are all larger than the inner diameter of the liquid inlet of the water pump 9, so that the water flow resistance is further reduced.
Because the installation height calculating standard surface 17 of the water seal pipe section and the raw water pump installation height calculating standard surface 24 have a certain distance, the installation height calculating standard surface 17 of the water seal pipe section is smaller than the maximum allowable installation height of the water pump 9, thus being more beneficial to the water pumping process, and if the installation height calculating standard surface 17 of the water seal pipe section is higher than the maximum allowable installation height of the water pump 9, the water pump is difficult to absorb water, even the water cannot be absorbed, and the water pump can be damaged. Wherein the height of the installation height calculation standard surface 17 of the water seal pipe section is the height h of the water neutral pipe 2 above the water level of the pool 2 Plus the sum of the radii of curvature a of the first bend 15.
All water volume V between overflow surface 19 of water seal pipe section body 3 and water pump inlet flange 27 s The water volume V between the water level in the underwater vertical pipe 2 and the overflow surface 19 of the water seal pipe section body is more than or equal to w Is 3 times more beneficial to the water pumping process; if V s Less than 3 times V w For example V s Is V (V) w 2 times or even 1 time, that V s After the volume of water is sucked by the water pump, the water can be completely in V w The semi-vacuum area is not formed in the volume, water in the pool cannot enter the underwater vertical pipe 2 and the water seal pipe section body 3 under the action of atmospheric pressure, and cannot enter the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8, so that the water pumping process cannot be completed.
The overflow surface 19 of the water seal pipe section body 3 is equal to or higher than the overflow port of the exhaust piece, so that the water pumping process can be smoothly carried out, and the following situations can be avoided when the overflow surface 19 of the water seal pipe section body 3 is lower than the overflow port of the exhaust piece: before the pump is started in the water pumping process, the filling valve 7 is opened to fill water into the liquid inlet pipe and the water pump 9, water in the water seal pipe section body 3 flows to the water surface 1 from the water seal pipe section overflow surface 19 through the horizontal pipe joint 16, the first elbow 15 and the water neutral pipe 2 of the water seal pipe section body 3, the exhaust valve 10 does not overflow to discharge water, residual air in the pump body is not discharged, the water pump 9 is not filled enough, and the water pumping is difficult.
The exhaust part (the exhaust valve 10 and/or the drain pipe overflow valve 28) is equal to the highest part of the water pump 9 body, which is convenient for observing the discharged water of the water pump 9 body and is more beneficial for judging V s The volume and whether the air in the body of the water pump 9 is completely exhausted.
Further, the exhaust part is the exhaust valve 10 and/or the drain pipe overflow valve 28, and the exhaust valve 10 and the drain pipe overflow valve 28 can exist at the same time or only one. The exhaust valve 10 is arranged on the water pump 9; the drain pipe overflow valve 28 is arranged on a pipeline connected with the check valve 12 at the water outlet end of the water pump 9.
When the water pump is used, before the water pump is started for the first time, after the water filling valve 7 is used for filling water into the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8, the water pump is started immediately, water in the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 is sucked away, a semi-vacuum area is formed in the water vertical pipe 2, and at the moment, water in a water tank enters the water vertical pipe 2, the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 under the action of atmospheric pressure, so that the water pumping process is completed. Stopping pumping after pumping water is finished, and before the water pump 9 is shut down, a Guan Chuye valve 13; after the water pump 9 is stopped, the check valve 12 is automatically closed, and the water in the liquid outlet pipe 14 does not flow back. After stopping the pump, the water in the water vertical pipe 2, the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 can not flow back to the pool due to siphoning, because: the filling valve 7, the exhaust valve 10, the liquid outlet valve 13, the check valve 12 and the liquid inlet valve 5 are closed successively, and no siphon phenomenon is formed when no air exists at the end.
After the pump is stopped, if the water pump 9 is not overhauled, as long as the liquid inlet valve 5 is tightly closed and air leakage is avoided, water in the water vertical pipe 2, the water seal pipe section body 3, the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 can be preserved, and the water diversion requirement when the water pump 9 is started next time is met.
If the water pump 9 is overhauled, water in the water vertical pipe 2, the water seal pipe section body 3 and the horizontal liquid inlet pipe 4 can be preserved, water in the horizontal liquid inlet short pipe 8 behind the liquid inlet valve 5 can run off, and before restarting, the horizontal liquid inlet short pipe 8 should be filled with water.
Through this embodiment, can accomplish the pump water process smoothly, and rivers resistance is little, and the water of pumping can not flow back to in the water source, and the water in water neutral pipe 2, water seal pipeline section body 3 and horizontal feed liquor pipe 4 and horizontal feed liquor nozzle stub 8 can preserve after the pump water is accomplished, satisfies the diversion needs that next water pump 9 starts to realize water supply and drainage smoothly.
Example 3:
a method of sizing a water pumping device, comprising:
(1) The technical parameters of the water pump 9 are mainly the diameter, the lift, the flow and the like of a liquid inlet of the water pump.
(2) Initial position: according to the installation site, the installation positions of the water pump 9, the water neutral pipe 2 and the water seal pipe section body 3 are preliminarily set according to the technical parameters of the water pump 9 and the installation requirements on the product specification of the water pump 9.
(3) Determining the size:
mainly determining the diameter (all refer to nominal diameter) of the water seal pipe section body 3 and the total length L of the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 48 Is calculated by the computer.
The method specifically comprises the following steps:
3-1: according to the principle of determining the diameter of the liquid inlet and the structural size of the water pump, the diameter d of the water neutral pipe 2 is determined 2 Diameter d of water seal pipe section body 3, horizontal liquid inlet pipe 4 and horizontal liquid inlet short pipe 8 348 The method comprises the steps of carrying out a first treatment on the surface of the The principle of determining the structural dimensions here refers to: the inner diameter of the underwater riser 2 is equal to or larger than the inner diameter of the liquid inlet of the water pump 9, and the inner diameter of the water seal pipe section body 3, the inner diameter of the horizontal liquid inlet pipe 4 and the inner diameter of the horizontal liquid inlet short pipe 8 are all larger than the inner diameter of the liquid inlet of the water pump 9.
3-2: according to the initial position of the water pump 9, the underwater vertical pipe 2 and the water seal pipe section body 3 and the installation site condition, the height h above the liquid level in the underwater vertical pipe 2 is determined 2 Length L of horizontal pipe section 16 16 Length L of vertical pipe section 20 20 Length L of flange nipple 22 between water seal pipe section body 3 and horizontal liquid inlet pipe 4 22 Curvature radius A of each elbow; wherein the flange nipple 22 has a length L 22 And is more than or equal to 200mm. Wherein the first, second and third elbows of the water seal pipe section body 3 are long radius elbows according to GB/T12459-2017, "type and parameters of Steel Butt welding pipe fitting", the numerical value of the length (namely, the curvature radius) A from the center of the elbow to the end face is selected. Because four bends form a ring, the water volume in the ring is approximately equal to the diameter d 348 The volume of water in the pipe is the bottom, taking the circumference of the inner center of the ring (pi×a×2) as the length. One of the bends has a length of only 1/4 of the circumference of the inner center of the ring.
3-3: calculating the total water volume V between the overflow surface 19 of the water seal pipe section body and the water pump inlet flange 27 s Water volume V of no water space between water level in water riser 2 and overflow surface 19 of water seal pipe section w ；
According to V s And V is equal to w Determining the minimum total length L of the horizontal feed pipe 4 and the horizontal feed short pipe 8 48 The method comprises the steps of carrying out a first treatment on the surface of the Wherein V is s ≥3V w When said V s ＝3V w In this case, the minimum total length L of the horizontal feed pipe 4 and the horizontal feed pipe nipple 8 can be obtained 48 。
The specific calculation process is as follows:
3-1, 3-2, the water volume is calculated according to the nominal diameter, the water volume V of the anhydrous space is calculated w The method comprises the following steps:
V w ＝V 2 +V 15 +V 16 +V 18(1/2)
V w a water volume which is a water-free space between the water level in the water-neutral pipe 2 and the overflow surface 19 of the water-sealed pipe section body;
V 2 at a height h above the water level in the water-neutral pipe 2 2 Is a water volume of (2);
V 15 is the volume of water within the first elbow 15;
V 16 water volume for horizontal pipe section 16;
V 18(1/2) half the volume of water in the second elbow 18, V 18(1/2) ＝V 15 ×(1/2)。
And then V w ＝π·(d 2 /2) 2 ·h 2 +[π·(d 348 /2) 2 ·(π·A×2)]×(1/4)+π·(d 348 /2) 2 ·L 16 +[π·(d 348 /2) 2 ·(π·A×2)]×(1/4)×(1/2)。
Third elbow 21 water volume V 21 V calculated as described above 21 ＝V 15 The method comprises the steps of carrying out a first treatment on the surface of the The volume of water in the liquid inlet valve 5 is not counted; because of the large water head between the horizontal liquid inlet short pipe 8 and the water pump 9, the total length L of the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 48 Containing the length of the large water head L 48 The water volume in the length is V 48 I.e. the water volume between flange 23 and pump inlet flange 27.
All water volume V between overflow surface 19 of water seal pipe section and flange 27 of water pump inlet s The calculation is as follows:
V s ＝V 18(1/2) +V 20 +V 21 +V 22 +V 48
V s the water volume from the overflow surface 19 of the water seal pipe section body to the water inlet flange 27 of the water pump is the whole;
V 18(1/2) v being the other half of the water volume in the second bend 18 18(1/2) ＝V 15 ×(1/2)；
V 20 Is the volume of water in the vertical pipe section;
V 21 v is the volume of water in the third bend 21 21 ＝V 15 ；
V 22 Is the water volume within the flange nipple 22;
V 48 is the total length L of the horizontal liquid inlet pipe 4 and the horizontal liquid inlet short pipe 8 48 Water volume within.
And then V s ＝[π·(d 348 /2) 2 ·(π·A×2)]×(1/4)×(1/2)+π·(d 348 /2) 2 ·L 20 +π·(d 348 /2) 2 ·[(π·A×2)×(1/4)]+π·(d 348 /2) 2 ·L 22 +π·(d 348 /2) 2 ·L
According to the principle of structural dimension determination, V s ≥3V w Taking: v (V) s ＝3V w Then L can be calculated 48 A value of the parameter. The L is 48 The value is the minimum total length value of the horizontal feed pipe 4 and the horizontal feed short pipe 8 which meet the installation requirement.
3-4: further comprises determining the maximum allowable installation height H of the water pump 9 according to the length L of the pipe section (namely the total length L of the liquid inlet pipe section) Szmax According to H Szmax Determining the installation height of the water seal pipe section body 3 and calculating the height h of the standard surface 17 17 Thereby determining the installation of the water pump 9 and the installation of the water-sealed pipe section body 3. So that the maximum allowable installation height H of the water pump 9 can be also used Szmax Whether the dimension design of the reverse thrust water seal pipe section body 3 meets the field installation requirement. When the allowable suction vacuum degree of the water seal pump is known, judging whether the water seal pipe section can be used for a field-mounted centrifugal pump or not, and meeting the conditions is needed: terrain water absorption lift = vacuum meter water absorption lift reading-line loss-water pump 9 inlet flow rate head loss.
Thus, H Szmax ≤[H S ]－(∑h S +v S 2 /2g)；
Wherein: [ H ] S ]The allowable suction vacuum (meters) specified for the water pump 9 production plant; sigma h S Hydraulic loss (meter) for suction pipe; v S 2 2g is the flow speed head loss (meter) of the suction inlet of the water pump 9; v S Average flow rate (meters per second) for suction inlet; g is gravity acceleration (9.81 m/s) 2 )；
∑h S ＝λ·(L/D)·v S 2 /(2g)+(∑ζ)·v S 2 /(2g)；
Wherein: lambda (L/D) v S 2 (2 g) is the pipeline on-way resistance loss (meters); (Σζ.v) S 2 (2 g) is the sum of the local resistance losses of the pipeline (meters); lambda is the along-the-way resistance coefficient; l is the length of the pipe section, namely the total length of the liquid inlet pipe section, L=the height h above the liquid level in the water neutral pipe 2 2 +total length of three elbows in water seal pipe section body 3 (pi×A×2) × (3/4) +length of horizontal pipe section 16L 16 +vertical pipe section 20 length L 20 Length L of flange nipple 22 22 Minimum total length L of + horizontal feed pipe 4 and horizontal feed pipe nipple 8 48 (rice); v S Average flow rate (meters per second) for the cross-section water flow of the pipeline; d, calculating the inner diameter (meters) of the pipeline; ζ is the local hydraulic loss coefficient of the pipeline.
The invention has reasonable design, simple structure and convenient installation, has unique sealing performance although being arranged above the water surface 1, has extremely small friction resistance, saves energy, is not blocked, saves maintenance, has long service life, is safe and reliable and has obvious effect because of no valve internal parts.
The invention is suitable for being matched with water pumps in industries such as petroleum and natural gas, petrochemical industry, chemical industry, light industry, textile, printing and dyeing, metallurgy, mine, drainage and irrigation, municipal administration, building, water conservancy and the like. Can be installed in front of the water pump to replace about 20% of the underwater bottom valve and 90% of the water bottom valve.
And (3) calculating economic benefits: it is known from the data that the average unit price of the underwater type bottom valves produced nationwide in recent years is about 10000, the average unit price of the underwater type bottom valves is about 4000 yuan, the average unit price of the water type bottom valves is about 20000 yuan, the cost of the water seal pipe sections is about 2000 yuan, and the installation cost of the three bottom valves is about the same.
However, according to the calculation of cost saving, the water seal pipe section of the invention saves cost nationally every year: 10000×20% × (4000-2000) +20000×90% × (6000-2000) =7600 ten thousand yuan.
The underwater bottom valve and the water-based bottom valve are overhauled once according to half a year, and the once expense is 500 yuan, so that the water-sealed pipe section of the invention is installed, and the overhauling expense is saved nationally every year: (10000×20% +20000×90%) ×2×500=2000 ten thousand yuan.
The water seal pipe section of the invention can save 9600 ten thousand yuan annually, and greatly reduce the equipment cost and the operation and maintenance cost of the water supply and drainage process.
The water-sealed pipeline section of the present invention may be used in creating 6000 ten thousand yuan in China.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The utility model provides a water pump feed liquor water seal pipeline section which characterized in that includes: the water seal pipe section body a with the communicated water containing space is formed by sequentially and hermetically connecting the first elbow, the horizontal pipe section, the second elbow, the vertical pipe section and the third elbow;
one end of the water seal pipe section body a is higher than the other end, one end of the water seal pipe section body a, which is higher than the water source liquid level, is in sealing communication with a water neutral pipe inserted into water, one end of the water seal pipe section body a, which is lower than the water seal pipe section body a, is in sealing communication with a horizontal liquid inlet pipe through a flange mounting assembly, the heights of the two ends of the water seal pipe section body a are lower than the overflow surfaces of the water seal pipe section body a, and the distance between the lower end of the water seal pipe section body a and the overflow surfaces is greater than the distance between the upper end of the water seal pipe section body a and the overflow surfaces, so that water pumped in the water pumping process does not flow back to the water source through the water seal pipe section body a.
2. The water pump inlet water seal pipe section of claim 1 wherein each of the bends is equal in size and the first bend and the second bend are symmetrically disposed on either side of the horizontal pipe section;
the diameters of the inner pipes of the first elbow, the horizontal pipe joint, the second elbow, the vertical pipe joint and the third elbow are equal;
each elbow is a long-radius elbow, and four elbows form a circular ring; the length of the horizontal pipe joint is greater than or equal to 0, the length of the vertical pipe joint is greater than or equal to the length of the horizontal pipe joint, and the length of the vertical pipe joint is not equal to 0; when the liquid enters the water seal pipe section body and the liquid level reaches the overflow surface of the water seal pipe section body, the volume of the space occupied by the liquid in the water seal pipe section body is larger than or equal to the volume of the space not occupied by the liquid.
3. The water pump liquid inlet water seal pipe section of claim 1, wherein the flange mounting assembly comprises a flange nipple and a flange, the flange nipple and the flange form a water seal pipe section body b, and the lower end of the water seal pipe section body a, the flange nipple and the flange are sequentially connected in a sealing manner.
4. The water pumping device is characterized by comprising the water inlet seal pipe section of the water pump, a water vertical pipe, a horizontal liquid inlet pipe, a liquid inlet valve, a liquid inlet pipe pressure meter, a liquid filling valve, a horizontal liquid inlet short pipe, a water pump and an exhaust piece, wherein the water vertical pipe is in sealing connection with a first elbow, the horizontal liquid inlet pipe is in sealing connection with the water seal pipe section body b, the liquid inlet valve is arranged at the tail end of the horizontal liquid inlet pipe, the liquid inlet pipe pressure meter and the liquid filling valve are fixedly arranged on the horizontal liquid inlet short pipe, and the tail end of the horizontal liquid inlet short pipe is communicated with the water pump.
5. The water pumping device according to claim 4, wherein the inner diameter of the water neutral pipe is equal to or larger than the inner diameter of the liquid inlet of the water pump, and the inner diameter of the water seal pipe section body, the inner diameter of the horizontal liquid inlet pipe and the inner diameter of the horizontal liquid inlet short pipe are all larger than the inner diameter of the liquid inlet of the water pump;
the height of the installation height calculation standard surface of the water seal pipe section is smaller than the maximum allowable installation height of the water pump, and the installation height calculation standard surface of the water seal pipe section is the sum of the height above the horizontal plane in the underwater vertical pipe and the curvature radius of the first elbow;
all water volume V between overflow surface of water seal pipe section body and water pump inlet flange s The water volume V between the water level in the underwater vertical pipe and the overflow surface of the water seal pipe section body is larger than or equal to w 3 times of (3);
the overflow surface of the water seal pipe section body is equal to or higher than the overflow port of the exhaust piece, and the exhaust piece is equal to the highest part of the water pump body in height.
6. The water pumping device according to claim 5, further comprising a liquid outlet pipe pressure gauge, a check valve, a liquid outlet valve and a liquid outlet pipe which are connected in sequence;
the exhaust part is an exhaust valve and/or a drain pipe overflow valve, and the exhaust valve is arranged on the water pump;
the drain pipe overflow valve and the drain pipe pressure gauge are both arranged on a pipeline connected with the water outlet end of the water pump and the check valve.
7. A method of sizing a water pumping apparatus according to any one of claims 4 to 6, comprising:
(1) Acquiring technical parameters of a water pump;
(2) Initial position: setting the installation positions of the water pump, the underwater vertical pipe and the water seal pipe section body according to the technical parameters of the water pump according to the installation site;
(3) Determining the size:
according to the principle of determining the diameter of the liquid inlet and the structural size of the water pump, the diameter d of the water riser is determined 2 Diameter d of water seal pipe section body, horizontal liquid inlet pipe and horizontal liquid inlet short pipe 348 ；
According to the initial position of the water pump, the underwater vertical pipe and the water seal pipe section body, determining the height h above the water level in the underwater vertical pipe 2 Length L of horizontal pipe section 16 Length L of vertical pipe section 20 Short length L of flange 22 Curvature radius A of each elbow;
calculating the total water volume V between the overflow surface of the water seal pipe section body and the flange of the water inlet of the water pump s Water volume V of water free space between water level in water neutral pipe and overflow surface of water sealed pipe w ；
According to V s And V is equal to w Determining the minimum total length L of the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe 48 。
8. The method for sizing a water pumping apparatus as defined in claim 7, wherein said V s ≥3V w When said V s ＝3V w When the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe are in a closed state, the minimum total length L of the horizontal liquid inlet pipe and the horizontal liquid inlet short pipe is obtained 48 。
9. The method for determining the installation dimension of a water pumping device as defined in claim 7, further comprising determining a maximum allowable installation height H of the water pump based on the total length L of the intake pipe section Szmax According to H Szmax Determining the installation height of the water seal pipe section body and calculating the standard surface height h 17 。
10. A method of sizing a water pump assembly according to claim 9, wherein said water pump has a maximum allowable mounting height H Szmax The determining method of (1) comprises the following steps:
H Szmax ≤[H S ]－(∑h S +v S 2 /2g)；
wherein: [ H ] S ]The allowable suction vacuum degree specified for the water pump production factory; sigma h S Hydraulic loss for suction pipe; v S 2 2g is the flow speed head loss of the suction inlet of the water pump; v S Is the average flow rate of the suction inlet; g is gravity acceleration;
∑h S ＝λ·(L/D)·v S 2 /(2g)+(∑ζ)·v S 2 /(2g)；
wherein: lambda (L/D) v S 2 (2 g) is the pipeline on-way resistance loss; (Σζ.v) S 2 (2 g) is the sum of the local resistance losses of the pipeline; lambda is the along-the-way resistance coefficient; l is the total length of the liquid inlet pipe section; v S Average flow rate (m/s) of water flow at the section of the pipeline; d is the inner diameter of the pipeline; ζ is the local hydraulic loss coefficient of the pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210703679.5A CN117307532A (en) | 2022-06-21 | 2022-06-21 | Water pump liquid inlet water seal pipe section, water pumping device and installation size determining method of water pumping device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210703679.5A CN117307532A (en) | 2022-06-21 | 2022-06-21 | Water pump liquid inlet water seal pipe section, water pumping device and installation size determining method of water pumping device |
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