A method for determining the inlet water seal pipe section, pumping device, and installation dimensions of a water pump.

Abstract

This invention discloses a water seal pipe section for a water pump inlet, a pumping device, and a method for determining its installation dimensions. The water seal pipe section includes a first elbow, a horizontal pipe section, a second elbow, a vertical pipe section, and a third elbow connected in a sealed manner to form a water seal pipe section body a with a communicating water-containing space. One end of the water seal pipe section body a is higher than the other end. The higher end of the water seal pipe section body a is above the water source liquid level and is sealed and connected to a water riser inserted into the water. The lower end of the water seal pipe section body a is sealed and connected to a horizontal inlet pipe via a flange mounting assembly. The height of both ends of the water seal pipe section body a is lower than its overflow surface, and the distance from the lower end of the water seal pipe section body a to the overflow surface is greater than the distance from the higher end to the overflow surface, so that the water pumped out during the pumping process does not flow back to the water source through the water seal pipe section body a. Because this water seal pipe section has no valve internals, it greatly reduces flow friction resistance, reduces scaling and clogging, and provides excellent sealing performance.

Description

Technical Field

[0001] This invention relates to the field of water supply and drainage engineering technology, specifically to a water pump inlet water seal pipe section, a water pumping device, and a method for determining their installation dimensions. Background Technology

[0002] In water supply and drainage engineering, water transportation is usually required. Water is transported from one point to another using pumps. Typically, when the water level at the intake is below the pump's inlet pipe, each centrifugal pump is equipped with a submersible foot valve at its inlet. This foot valve is actually a type of check valve, preventing backflow. That is, when the pump stops working for a short time, it ensures that liquid does not return to the water source while also keeping the centrifugal pump's inlet pipe full of liquid, facilitating the pump's next startup.

[0003] The existing underwater foot valves are fixedly installed in the water. Due to long-term immersion, the valve body is prone to scaling, clogging, and corrosion. If the sewage or chemical substances are being transported, the scaling will be more severe, the corrosion will be accelerated, maintenance will be difficult, and there will be safety risks.

[0004] Another type is the surface-mounted foot valve, which has replaced some underwater foot valves. The valve body is installed on the water surface, making maintenance convenient. However, this type of surface-mounted foot valve experiences high fluid resistance; if the water is sewage or contains other chemicals, problems such as corrosion, scaling, and sluggish operation become more severe. This also significantly increases operating costs in water supply and drainage processes. Summary of the Invention

[0005] To address the problems existing with the foot valve installed at the inlet end of centrifugal pumps in current water supply and drainage projects, the present invention aims to provide a water pump inlet water seal pipe section, a pumping device for the water pump inlet water seal pipe section, and a method for determining the installation dimensions of the pumping device, thereby reducing inlet flow resistance, reducing scaling and clogging, and providing a sealing function to meet installation and usage requirements.

[0006] This invention is achieved through the following technical solution:

[0007] The first objective of this invention is to provide a water seal pipe section for a water pump inlet, comprising a first elbow, a second elbow, and a third elbow. A horizontal pipe section is provided between the first elbow and the second elbow, and a vertical pipe section is provided between the second elbow and the third elbow. The first elbow, the horizontal pipe section, the second elbow, the vertical pipe section, and the third elbow are sequentially and sealed together to form a water seal pipe section body a with a communicating water-containing space.

[0008] One end of the water seal pipe section body a is higher than the other end. The higher end of the water seal pipe section body a is higher than the water source liquid level and is sealed and connected to the water riser inserted in the water. The lower end of the water seal pipe section body a is sealed and connected to the horizontal liquid inlet pipe through a flange mounting assembly. The height of both ends of the water seal pipe section body a is lower than its overflow surface, and the distance from the lower end of the water seal pipe section body a to the overflow surface is greater than the distance from the higher end to the overflow surface, so that the water pumped out during the pumping process does not flow back to the water source through the water seal pipe section body a.

[0009] In an optional embodiment, all the elbows are of equal size, and the first elbow and the second elbow are symmetrically arranged on both sides of the horizontal pipe section;

[0010] The inner pipe diameters of the first elbow, horizontal pipe section, second elbow, vertical pipe section, and third elbow are all equal.

[0011] Each of the elbows is a long-radius elbow, and the four elbows form a ring;

[0012] The length of the horizontal pipe section is greater than or equal to 0; 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; when liquid enters the body of the water seal pipe section 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 body of the water seal pipe section is greater than or equal to the volume of the space not occupied by the liquid.

[0013] In an optional embodiment, the flange mounting assembly includes a flange stub and a flange, the flange stub and the flange constituting a water seal pipe section body b, and the lower end of the water seal pipe section body a, the flange stub and the flange are sequentially and sealingly connected.

[0014] The second objective of this invention is to provide a water pumping device, comprising a water pump inlet water seal pipe section as described in any one of claims 1 to 3, and further comprising a water riser, a horizontal inlet pipe, an inlet valve, an inlet pipe pressure gauge, a filling valve, a horizontal inlet short pipe, a water pump, and an exhaust component. The water riser is sealed to a first elbow, the horizontal inlet pipe is sealed to the water seal pipe section body b, the inlet valve is installed at the end of the horizontal inlet pipe, the inlet pipe pressure gauge and the filling valve are both fixedly installed on the horizontal inlet short pipe, and the end of the horizontal inlet short pipe is connected to the water pump.

[0015] In an optional embodiment, the inner diameter of the water riser is equal to or greater than the inner diameter of the water pump inlet, and the inner diameter of the water seal pipe section body, the inner diameter of the horizontal inlet pipe, and the inner diameter of the horizontal inlet short pipe are all greater than the inner diameter of the water pump inlet.

[0016] The height of the standard plane for calculating the installation height of the water seal pipe section is less than the maximum allowable installation height of the water pump. The standard plane for calculating the installation height of the water seal pipe section is the sum of the height above the horizontal plane inside the water riser and the radius of curvature of the first bend.

[0017] The total water volume V between the overflow surface of the water seal pipe section and the inlet flange of the water pump. s The water volume V between the horizontal surface inside the water riser and the overflow surface of the water seal pipe section is greater than or equal to the water volume V. w 3 times;

[0018] The overflow surface height of the water seal pipe section is equal to or higher than the overflow port of the exhaust component, and the exhaust component is at the same height as the highest point of the water pump body.

[0019] In an optional embodiment, the system further includes a pressure gauge for the outlet pipe, a check valve, an outlet valve, and an outlet pipe connected in sequence.

[0020] The venting component is an venting valve and / or a liquid outlet overflow valve, and the venting valve is installed on the water pump;

[0021] The overflow valve and the pressure gauge of the outlet pipe are both installed on the pipe connecting the water pump outlet end to the check valve.

[0022] A third objective of this invention is to provide a method for determining the installation dimensions of the aforementioned water pump device, comprising:

[0023] (1) Obtain the technical parameters of the water pump;

[0024] (2) Initial location determination: Based on the installation site, determine the installation location of the water pump, water riser, and water seal pipe section according to the technical parameters of the water pump;

[0025] (3) Determine the dimensions:

[0026] Based on the principles for determining the diameter of the water pump inlet and structural dimensions, the diameters d2 of the underwater riser, the water seal pipe section, the horizontal inlet pipe, and the horizontal inlet short pipe are determined. 348 ;

[0027] Based on the initial positions of the water pump, the underwater riser, and the water seal pipe section, determine the height h2 above the horizontal plane inside the underwater riser and the length L of the horizontal pipe section. 16 Vertical pipe section length L 20 Flange short section length L 22 , the radius of curvature A of each bend;

[0028] Calculate the total water volume V between the overflow surface of the water seal pipe section and the inlet flange of the water pump. s The water volume V of the empty space between the horizontal plane inside the water riser and the overflow surface of the water seal pipe section is as follows: w ;

[0029] According to V s With V w Determine the minimum total length L of the horizontal inlet pipe and the horizontal inlet short pipe. 48 .

[0030] In an alternative embodiment, the V s ≥3V w When the V s =3V w At that time, the minimum total length L of the horizontal inlet pipe and the horizontal inlet short pipe is obtained. 48 .

[0031] In an optional embodiment, the maximum allowable installation height H of the water pump is determined based on the pipe section length L (i.e., the total length L of the inlet pipe section). Szmax According to H Szmax Determine the standard surface height h for the installation height of the water seal pipe section. 17 .

[0032] In an optional embodiment, the maximum permissible installation height H of the water pump Szmax The method for determining it is as follows:

[0033] H Szmax ≤[H S ]-(∑h S +v S 2 / 2g);

[0034] Among them: [H S ] represents the permissible suction vacuum level specified by the pump manufacturer; ∑h S For hydraulic losses in the suction pipe; v S 2 / 2g represents the head loss at the pump inlet velocity; v S The average flow velocity at the inlet is g; g is the acceleration due to gravity.

[0035] ∑h S =λ·(L / D)·v S 2 / (2g)+(∑ζ)·v S 2 / (2g);

[0036] Where: λ·(L / D)·v S 2 / (2g) represents the friction loss along the pipeline; (∑ζ)·v S 2 / (2g) is the sum of local resistance losses in the pipeline; λ is the friction coefficient; L is the length of the pipe section, i.e., the total length of the inlet pipe section, L = height h2 above the liquid surface in the water riser + total length of the three bends in the water seal pipe section (π×A×2)×(3 / 4) + length of the horizontal pipe section L 16 +Vertical pipe section length L 20 +Flange short section length L 22 +Minimum total length L of horizontal inlet pipe 4 and horizontal inlet short pipe 8 48 (meter); v S ζ represents the average flow velocity of water across the pipe cross-section (m / s); D represents the calculated inner diameter of the pipe (m); and ζ represents the local hydraulic loss coefficient of the pipe.

[0037] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0038] This invention, through the installation of a water seal pipe section at the pump inlet, is a replacement for the foot valve. Installed at the bend of the riser pipe above the water surface, it eliminates all components of the foot valve, resulting in extremely low flow friction resistance and energy savings of 70%–90% compared to surface-mounted foot valves. It also reduces scaling and clogging, lowers maintenance frequency, and consequently reduces costs and operating expenses. Furthermore, it provides a water seal with excellent sealing performance, eliminating leakage. The pumping device and its installation dimension determination method provided by this invention ensure that the installation of the water seal pipe section and pump meets operational requirements. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0040] Figure 1 This is a schematic diagram of a water pump inlet water seal pipe section provided in an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of another structure of the water pump inlet water seal pipe section provided in an embodiment of the present invention.

[0042] Figure 3 This is a schematic diagram of the installation process of the water pump device provided in an embodiment of the present invention.

[0043] The components and their corresponding markings in the attached diagram are as follows:

[0044] 1-Water surface, 2-Water riser, 3-Water seal pipe section body, 4-Horizontal inlet pipe, 5-Inlet valve, 6-Inlet pipe pressure gauge, 7-Inlet valve, 8-Horizontal inlet short pipe, 9-Water pump, 10-Exhaust valve, 11-Outlet pipe pressure gauge, 12-Check valve, 13-Outlet valve, 14-Outlet pipe, 15-First elbow, 16-Horizontal pipe section, 17-Water seal pipe section installation height calculation standard surface, 18-Second elbow, 19-Water seal pipe section body overflow surface, 20-Vertical pipe section, 21-Third elbow, 22-Flange short section, 23-Flange, 24-Original water pump installation height calculation standard surface, 25-U-shaped elbow, 26-Water pump outlet flange, 27-Water pump inlet flange, 28-Outlet pipe overflow valve. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0046] Example 1: A water seal pipe section for a water pump inlet

[0047] The water pump inlet water seal pipe section of this embodiment includes: a first elbow 15, a second elbow 18, and a third elbow 21. A horizontal pipe section 16 is provided between the first elbow 15 and the second elbow 18, and the horizontal pipe section 16 is placed horizontally. A vertical pipe section 20 is provided between the second elbow 18 and the third elbow 21, and the vertical pipe section 20 is placed vertically. The first elbow 15, the horizontal pipe section 16, the second elbow 18, the vertical pipe section 20, and the third elbow 21 are sequentially and sealed together, and all of them are hollow tubular structures, forming a water seal pipe section body a with a communicating water-containing space.

[0048] One end of the water seal pipe section body a is higher than the other end, that is, the height of the first elbow 15 in space is higher than the height of the third elbow 21 in space. The higher end of the water seal pipe section body a (i.e., the end of the first elbow 15) is higher than the water source liquid level and is sealed and connected to the water riser 2 inserted in the water. One end of the water riser 2 is inserted below the water source, and the other end is located above the water source. The water riser 2 is placed vertically in space. The lower end of the water seal pipe section body a (i.e., the end of the third elbow 21) is sealed and connected to the horizontal liquid inlet pipe 4 through the flange mounting assembly. Both the flange mounting assembly and the horizontal liquid inlet pipe 4 are arranged in the horizontal direction. The height of both ends of the water seal pipe section body a is lower than its overflow surface 19. The overflow surface 19 of the water seal pipe section body a is the horizontal surface where the water flow reaches the inner wall of the horizontal pipe section 16, which is lower in height. If the water flow crosses the overflow surface 19, it will enter the horizontal pipe section 16 and flow back into the water source. The length of the horizontal pipe section 16 is greater than or equal to 0, preferably greater than 0 (see details for specific structure). Figure 1 (As shown in the diagram); thus, the first elbow 15, horizontal pipe section 16, second elbow 18, vertical pipe section 20, and third elbow 21 form a U-shaped structure with an upward bend and a downward bend. This allows water to flow smoothly through both upward and downward bends. Furthermore, due to the setting of the upward and downward bends, and the fact that the distance between the lower end of the water seal pipe section a (i.e., the end of the third elbow 21 near the flange mounting assembly) and the overflow surface 19 in the horizontal direction is greater than the distance between the higher end (i.e., the end of the first elbow 15 near the water riser 2) and the overflow surface 19 in the horizontal direction, a height barrier can be set for water backflow, thereby playing the role of a water seal and a stop valve. The sealing performance is good, preventing the water pumped out during the pumping process from flowing back to the water source through the water seal pipe section a.

[0049] When the length of the horizontal pipe section 16 is 0, a U-shaped elbow 25 can be used to replace a portion 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. See the specific structure below. Figure 2 As shown in the image.

[0050] Furthermore, the dimensions and shapes of all the elbows are equal, and the first elbow 15 and the second elbow 18 are symmetrically arranged on both sides of the horizontal pipe section 16; the inner pipe diameters of the first elbow 15, the horizontal pipe section 16, the second elbow 18, the vertical pipe section 20, and the third elbow 21 are all equal; the ports where the pipes connect are aligned so that the contact surfaces are flush and the resistance of the water flow is reduced.

[0051] Furthermore, each of the elbows is a long-radius elbow, and the four elbows form a 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 the length of the vertical pipe section, when 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 the volume of the space not occupied by the liquid; if the length of the vertical pipe section is greater than the length of the horizontal pipe section, when 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. This arrangement can further improve the reliability of preventing water backflow and improve the sealing performance of the water seal pipe section.

[0052] Furthermore, the flange mounting assembly includes a flange stub 22 and a flange 23, which together constitute the water seal pipe section body b. The flange stub 22 is located between the lower end of the water seal pipe section body a and the flange 23. The lower end of the water seal pipe section body a (i.e., one end of the third elbow 21), the flange stub 22, and the flange 23 are sequentially and sealingly connected, with the flange stub 22 being horizontally positioned. The water seal pipe section body b and the water seal pipe section body a together form the water seal pipe section body 3.

[0053] The water riser 2 is connected to one end of the horizontal pipe section body 3, and the other end of the horizontal pipe section body 3 is connected to the horizontal liquid inlet pipe 4 through flange 23 to form a liquid inlet channel.

[0054] During initial operation, before starting, fill the horizontal inlet pipe 4 and horizontal inlet short pipe 8 with water through the filling valve 7 in the entire pumping device, then start immediately. The water in the water seal pipe section 3, horizontal inlet pipe 4, and horizontal inlet short pipe 8 will begin to be drawn away, creating a semi-vacuum zone in the water riser 2. At this time, water in the water tank, under atmospheric pressure, enters the water riser 2, water seal pipe section 3, horizontal inlet pipe 4, and horizontal inlet short pipe 8, completing the pumping process. After pumping is complete, stop the pump. The water in the water riser 2, water seal pipe section 3, and horizontal inlet pipe 4 will not flow back into the water tank due to siphoning.

[0055] This invention, through the installation of a water seal pipe section at the water pump inlet, is a replacement product for the foot valve. It is installed at the bend of the riser 2 above the water surface 1. This water seal pipe section is essentially a pipe assembly, eliminating all components within the foot valve. It exhibits extremely low flow friction resistance, resulting in 70%–90% energy savings compared to surface-mounted foot valves. It is non-scaling and non-clogging. Furthermore, it eliminates the aging issues of the sealing gasket between the valve cover and valve body, and the damage to the sealing gasket between the valve core and valve seat, which are common problems in surface-mounted foot valves. This reduces maintenance, lowers costs and operating expenses, and minimizes safety and environmental risks. Simultaneously, this water seal pipe section provides a water seal, ensuring excellent sealing performance and eliminating leakage problems.

[0056] Example 2:

[0057] A water pumping device includes a water pump inlet water seal pipe section as described in Embodiment 1 above, and further includes an underwater riser 2, a horizontal inlet pipe 4, an inlet valve 5, an inlet pipe pressure gauge 6, a filling valve 7, a horizontal inlet short pipe 8, a water pump 9, and an exhaust device. The underwater riser 2 is sealed to a first elbow 15, the horizontal inlet pipe 4 is sealed to the water seal pipe section body b, the inlet valve 5 is installed at the end of the horizontal inlet pipe 4, the inlet pipe pressure gauge 6 and the filling valve 7 are both fixedly installed on the horizontal inlet short pipe 8, and the end of the horizontal inlet short pipe 8 is connected to the water pump 9.

[0058] It also includes a liquid outlet pressure gauge 11, a check valve 12, a liquid outlet valve 13, and a liquid outlet pipe 14 connected in sequence; a connecting pipe is provided between the water pump 9 and the check valve 12, and the liquid outlet pressure gauge 11 is installed on the connecting pipe; in addition, a water pump inlet flange 27 and a water pump outlet flange 26 are respectively provided at the front end of the water pump inlet and the rear end of the water pump outlet.

[0059] The inner diameter of the water riser 2 is equal to or greater than the inner diameter of the inlet of the water pump 9, thereby reducing water flow resistance; the inner diameter of the water seal pipe section body 3, the inner diameter of the horizontal inlet pipe 4, and the inner diameter of the horizontal inlet short pipe 8 are all greater than the inner diameter of the inlet of the water pump 9, thereby further reducing water flow resistance.

[0060] Because there is a certain distance between the installation height calculation standard surface 17 of the water seal pipe section and the original water pump installation height calculation standard surface 24, the height of the installation height calculation standard surface 17 of the water seal pipe section is less than the maximum allowable installation height of the water pump 9. This setting is more conducive to the water pumping process. If the height of the installation height calculation 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 will have difficulty drawing water, and may not only fail to draw water, but may also be damaged. The height of the installation height calculation standard surface 17 of the water seal pipe section is the sum of the height h2 above the water surface in the water riser 2 and the radius of curvature A of the first bend 15.

[0061] The total water volume V between the overflow surface 19 of the water seal pipe section 3 and the water pump inlet flange 27. s The water volume V between the horizontal surface of the water riser 2 and the overflow surface 19 of the water seal pipe section is greater than or equal to the water volume V between the horizontal surface of the riser 2 and the overflow surface 19 of the water seal pipe section. w Three times that of the pump, this setting is more conducive to the pumping process; if V s Less than 3 times V w , such as V s For V w Two times or even one time, then V s Once the water in the volume is sucked away by the water pump, it is entirely possible that it will be in V. w Before a semi-vacuum zone is formed in the volume, the water in the pool cannot enter the water riser 2 and the water seal pipe section 3 under atmospheric pressure, nor can it enter the horizontal inlet pipe 4 and the horizontal inlet short pipe 8, thus the pumping process cannot be completed.

[0062] The overflow surface 19 of the water seal pipe section body 3 is equal to or higher than the overflow port of the exhaust component. This setting allows the water pumping process to proceed smoothly and avoids the following situation when the overflow surface 19 of the water seal pipe section body 3 is lower than the overflow port of the exhaust component: Before starting the pump during the water pumping process, the filling valve 7 is opened to inject water into the inlet pipe and the water pump 9. The water in the water seal pipe section body 3 will first flow from the overflow surface 19 of the water seal pipe section, through the horizontal pipe section 16, the first elbow 15, and the water riser 2 of the water seal pipe section body 3 to the water surface 1. However, the exhaust valve 10 does not overflow water, the residual air in the pump body has not been completely discharged, the water pump 9 is not fully filled, and the water pumping is difficult.

[0063] The venting components (venting valve 10 and / or outlet overflow valve 28) are at the same height as the highest point of the water pump 9 body, which facilitates observation of the water discharged from the water pump 9 body and is more conducive to judging V. s Have all the air in the volume and pump body been completely purged?

[0064] Furthermore, the venting components are an vent valve 10 and / or an outlet pipe overflow valve 28. The vent valve 10 and the outlet pipe overflow valve 28 can coexist or there can be only one of them. The vent valve 10 is installed on the water pump 9; the outlet pipe overflow valve 28 is installed on the pipe connecting the water outlet end of the water pump 9 to the check valve 12.

[0065] During initial use, before starting, fill the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 with water through the filling valve 7, then start immediately. The water in the water seal pipe section 3, the horizontal inlet pipe 4, and the horizontal inlet short pipe 8 will begin to be drawn away, creating a semi-vacuum zone in the water riser 2. At this time, the water in the pool enters the water riser 2, the water seal pipe section 3, and the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 under atmospheric pressure, completing the pumping process. After pumping is complete, stop the pump. Before shutting down the pump 9, close the outlet valve 13; after the pump 9 stops, the check valve 12 automatically closes, preventing backflow of water in the outlet pipe 14. After the pump stops, the water in the water riser 2, water seal pipe section 3, horizontal inlet pipe 4, and horizontal inlet short pipe 8 will not flow back into the water tank due to siphon effect. This is because the filling valve 7, air vent valve 10, outlet valve 13, check valve 12, and inlet valve 5 are all closed in sequence. There is no air at this end, so no siphon effect is formed.

[0066] After the pump stops, if the water pump 9 is not inspected, as long as the inlet valve 5 is closed tightly and there is no air leakage, the water in the water riser 2, the water seal pipe section 3, the horizontal inlet pipe 4, and the horizontal inlet short pipe 8 will be preserved to meet the water priming needs when the water pump 9 is started again.

[0067] If water pump 9 is under maintenance, the water in the water riser 2, water seal pipe section 3, and horizontal inlet pipe 4 will be retained, while the water in the horizontal inlet short pipe 8 after the inlet valve 5 will be lost. Before restarting, the horizontal inlet short pipe 8 should be filled with water.

[0068] Through this embodiment, the water pumping process can be completed smoothly with low water flow resistance. The pumped water will not flow back into the water source. After the water pumping is completed, the water in the water riser 2, the water seal pipe section 3, the horizontal liquid inlet pipe 4, and the horizontal liquid inlet short pipe 8 will be preserved to meet the water priming needs for the next start of the water pump 9, thereby successfully realizing water supply and drainage.

[0069] Example 3:

[0070] Methods for determining the installation dimensions of water pumping units include:

[0071] (1) Obtain the technical parameters of the water pump, mainly the diameter of the water pump inlet, head, flow rate, etc.

[0072] (2) Initial location determination: Based on the installation site, according to the technical parameters of water pump 9 and the installation requirements in the product manual of water pump 9, the installation locations of water pump 9, water riser 2 and water seal pipe section body 3 are initially determined.

[0073] (3) Determine the dimensions:

[0074] The main focus is on determining the diameter (nominal diameter) of the water seal pipe section 3 and the total length L of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8. 48 The calculation.

[0075] Specifically, it includes:

[0076] 3-1: Based on the principles for determining the diameter of the water pump inlet and structural dimensions, determine the diameter d2 of the underwater riser 2, the diameter d of the water seal pipe section 3, the diameter d of the horizontal inlet pipe 4, and the diameter d of the horizontal inlet short pipe 8. 348 The principle for determining the structural dimensions here is that the inner diameter of the water riser 2 is equal to or greater than the inner diameter of the inlet of the water pump 9, and the inner diameters of the water seal pipe section body 3, the horizontal inlet pipe 4, and the horizontal inlet short pipe 8 are all greater than the inner diameter of the inlet of the water pump 9.

[0077] 3-2: Based on the initial positions of water pump 9, underwater riser 2, water seal pipe section 3, and the installation site conditions, determine the height h2 above the liquid level in underwater riser 2 and the length L of horizontal pipe section 16. 16 Vertical pipe section 20mm length L 20 The length L of the flange short section 22 between the water seal pipe section body 3 and the horizontal inlet pipe 4 22 The radius of curvature A of each elbow; where the length L of the flange stub is 22. 22≥200mm. Among them, the first, second, and third elbows of the water seal pipe section 3 are all long-radius elbows. According to GB / T12459-2017 "Types and Parameters of Steel Butt-Welded Pipe Fittings", the value of the length from the elbow center to the end face (i.e., the radius of curvature) A is selected. Since four elbows of this type form a ring, the water volume inside the ring is approximately equal to the diameter d. 348 The volume of water in a pipe with a base of π and a length equal to the circumference of the inner center of the ring (π×A×2). One of the bends is only 1 / 4 the length of the inner center circumference of the ring.

[0078] 3-3: Calculate the total water volume V between the overflow surface 19 of the water seal pipe section and the inlet flange 27 of the water pump. s The water volume V of the empty space between the horizontal plane inside the water riser 2 and the overflow surface 19 of the water seal pipe section is as follows: w ;

[0079] According to V s With V w Determine the minimum total length L of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8. 48 ;where V s ≥3V w When the V s =3V w At that time, the minimum total length L of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 can be obtained. 48 .

[0080] The specific calculation process is as follows:

[0081] After determining the values ​​in 3-1 and 3-2, the water volume is calculated based on the nominal diameter. Therefore, the water volume V of the dry space is... w for:

[0082] V w =V2+V 15 +V 16 +V 18(1 / 2)

[0083] V w The water volume of the dry space between the horizontal plane inside the water riser 2 and the overflow surface 19 of the water seal pipe section body;

[0084] V2 is the water volume at a height h2 above the horizontal plane inside the water riser 2;

[0085] V 15 This refers to the water volume within the first bend 15.

[0086] V 16 The water volume of horizontal pipe section 16;

[0087] V 18(1 / 2) V is half the water volume inside the second bend 18.18(1 / 2) =V 15 ×(1 / 2).

[0088] Furthermore V w =π·(d² / 2) 2 ·h2+[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).

[0089] The third bend has a water volume of 21V. 21 Based on the aforementioned calculations, V 21 =V 15 The water volume inside the inlet valve 5 is negligible; due to the large water head between the horizontal inlet short pipe 8 and the water pump 9, the total length L of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 is... 48 Including this large head length, L 48 The water volume within the length is V 48 That is, the water volume between flange 23 and water pump inlet flange 27.

[0090] The total water volume V between the overflow surface 19 of the water seal pipe section and the inlet flange 27 of the water pump is... s The calculation is as follows:

[0091] V s =V 18(1 / 2) +V 20 +V 21 +V 22 +V 48

[0092] V s The total water volume between the overflow surface 19 of the water seal pipe section and the inlet flange 27 of the water pump;

[0093] V 18(1 / 2) V is the other half of the water volume within the second bend 18. 18(1 / 2) =V 15 ×(1 / 2);

[0094] V 20 This refers to the water volume within the vertical pipe section;

[0095] V 21 V is the water volume within the third bend 21. 21 =V 15 ;

[0096] V 22This refers to the water volume within flange stub 22;

[0097] V 48 The total length L of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 48 The internal water volume.

[0098] Furthermore 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

[0099] According to the principle of determining structural dimensions, V s ≥3V w Take: V s =3V w Then L can be calculated. 48 The value of L. 48 The value is the minimum total length of the horizontal inlet pipe 4 and the horizontal inlet short pipe 8 that meet the installation requirements.

[0100] 3-4: This also includes determining the maximum allowable installation height H of the water pump 9 based on the pipe section length L (i.e., the total length L of the inlet pipe section). Szmax According to H Szmax Determine the installation height of the water seal pipe section 3, and calculate the standard surface height h17. 17 This allows for the determination of the installation of water pump 9 and the water seal pipe section 3. Furthermore, it allows for the determination of the maximum allowable installation height H of water pump 9. Szmax To determine whether the dimensions of the water seal pipe section 3 meet the on-site installation requirements, and given the allowable suction vacuum of the water seal pump, the condition for determining whether the water seal pipe section can be used for the centrifugal pump installed on-site is: topographic suction head = vacuum gauge suction head reading - pipeline losses - pump inlet velocity head loss.

[0101] Therefore, H Szmax ≤[H S ]-(∑h S +v S 2 / 2g);

[0102] Among them: [H S] is the permissible suction vacuum (meters) specified by the manufacturer of water pump 9; ∑h S Hydraulic loss in the suction pipe (meters); v S 2 / 2g represents the head loss (in meters) at the suction inlet of water pump 9; v S The average flow velocity at the inlet is (m / s); g is the acceleration due to gravity (9.81 m / s²). 2 );

[0103] ∑h S =λ·(L / D)·v S 2 / (2g)+(∑ζ)·v S 2 / (2g);

[0104] Where: λ·(L / D)·v S 2 / (2g) represents the friction loss along the pipeline (meters); (∑ζ)·v S 2 / (2g) is the sum of local resistance losses in the pipeline (meters); λ is the friction coefficient; L is the length of the pipe section, i.e., the total length of the inlet pipe section, L = height h2 above the liquid surface in the water riser 2 + total length of the three bends in the water seal pipe section 3 (π×A×2)×(3 / 4) + length L of the horizontal pipe section 16 16 + Vertical pipe section 20 length L 20 +Flange short section 22 length L 22 +Minimum total length L of horizontal inlet pipe 4 and horizontal inlet short pipe 8 48 (meter); v S ζ represents the average flow velocity of water across the pipe cross-section (m / s); D represents the calculated inner diameter of the pipe (m); and ζ represents the local hydraulic loss coefficient of the pipe.

[0105] This invention is reasonably designed, has a simple structure, and is easy to install. Although it is installed above the water surface 1, it has unique sealing performance. Since there are no valve internals, the frictional resistance is extremely small, which saves energy, does not cause blockage, reduces maintenance, has a long service life, is safe and reliable, and has significant effects.

[0106] This invention is suitable for use with water pumps in industries such as oil and gas, petrochemicals, chemicals, light industry, textiles, printing and dyeing, metallurgy, mining, irrigation and drainage, municipal engineering, construction, and water conservancy. It can be installed before the water pump and replaces approximately 20% of underwater foot valves and 90% of above-water foot valves.

[0107] Economic benefit calculation: According to the data, the annual production of underwater foot valves in China is about 10,000 units, with an average unit price of about 4,000 yuan. The production of above-water foot valves is about 20,000 units, with an average unit price of about 6,000 yuan. The cost of water seal pipe section is about 2,000 yuan. The installation costs of the three types of foot valves are roughly the same.

[0108] However, based on the cost savings, the annual cost savings nationwide for the water seal pipe section of this invention is: 10000×20%×(4000-2000)+20000×90%×(6000-2000)=76 million yuan.

[0109] If the underwater and above-water foot valves are to be inspected every six months at a cost of 500 yuan, then the annual maintenance cost saved nationwide by installing the water seal pipe section of this invention is: (10000×20%+20000×90%)×2×500=20 million yuan.

[0110] Using the water seal pipe section of this invention can save 96 million yuan annually nationwide, greatly reducing equipment costs and operation and maintenance expenses in the water supply and drainage process.

[0111] Based on sales prices, the water-sealed pipe section using this invention patent can generate an economic value of 60 million yuan nationwide.

[0112] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A water pumping device, characterized in that, The device includes a water pump inlet water seal pipe section, and also includes a water riser, a horizontal inlet pipe, an inlet valve, an inlet pipe pressure gauge, a filling valve, a horizontal inlet short pipe, a water pump, and an exhaust device. The water riser is sealed to a first elbow, the horizontal inlet pipe is sealed to the water seal pipe section body b, the inlet valve is installed at the end of the horizontal inlet pipe, the inlet pipe pressure gauge and the filling valve are both fixedly installed on the horizontal inlet short pipe, and the end of the horizontal inlet short pipe is connected to the water pump. The inner diameter of the water riser is equal to or greater than the inner diameter of the water pump inlet, and the inner diameter of the water seal pipe section body, the inner diameter of the horizontal inlet pipe, and the inner diameter of the horizontal inlet short pipe are all greater than the inner diameter of the water pump inlet. The height of the standard plane for calculating the installation height of the water seal pipe section is less than the maximum allowable installation height of the water pump. The standard plane for calculating the installation height of the water seal pipe section is the sum of the height above the horizontal plane inside the water riser and the radius of curvature of the first bend. The total water volume V between the overflow surface of the water seal pipe section body and the water pump inlet flange s Greater than or equal to 3 times the water volume V between the water level in the water in the standpipe and the overflow surface of the water seal pipe section body w ​ The overflow surface height of the water seal pipe section is equal to or higher than the overflow port of the exhaust component, and the exhaust component is at the same height as the highest point of the water pump body; The water pump inlet water seal pipe section includes: a first elbow, a second elbow, and a third elbow. A horizontal pipe section is provided between the first elbow and the second elbow, and a vertical pipe section is provided between the second elbow and the third elbow. The first elbow, the horizontal pipe section, the second elbow, the vertical pipe section, and the third elbow are sequentially and sealed together to form a water seal pipe section body a with a communicating water-containing space. One end of the water seal pipe section body a is higher than the other end. The higher end of the water seal pipe section body a is higher than the water source liquid level and is sealed and connected to the water riser inserted in the water. The lower end of the water seal pipe section body a is sealed and connected to the horizontal liquid inlet pipe through a flange mounting assembly. The height of both ends of the water seal pipe section body a is lower than its overflow surface, and the distance from the lower end of the water seal pipe section body a to the overflow surface is greater than the distance from the higher end to the overflow surface, so that the water pumped out during the pumping process does not flow back to the water source through the water seal pipe section body a. All the elbows are of equal size, and the first elbow and the second elbow are symmetrically arranged on both sides of the horizontal pipe section; The inner pipe diameters of the first elbow, horizontal pipe section, second elbow, vertical pipe section, and third elbow are all equal. Each of the elbows is a long-radius elbow, and the four elbows form a ring; the length of the horizontal pipe section is greater than or equal to 0, 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; when liquid enters the body of the water seal pipe section 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 greater than or equal to the volume of the space not occupied by the liquid; The flange mounting assembly includes a flange stub and a flange. The flange stub and the flange constitute the water seal pipe section body b. The lower end of the water seal pipe section body a, the flange stub, and the flange are sequentially and sealed together.

2. A water pumping device as described in claim 1, characterized in that, It also includes a pressure gauge, check valve, outlet valve, and outlet pipe connected in sequence; The venting component is an venting valve and / or a liquid outlet overflow valve, and the venting valve is installed on the water pump; The overflow valve and the pressure gauge of the outlet pipe are both installed on the pipe connecting the water pump outlet end to the check valve.

3. The method for determining the installation dimensions of a water pumping device as described in any one of claims 1 to 2, characterized in that, include: (1) Obtain the technical parameters of the water pump; (2) Initial location determination: Based on the installation site, determine the installation location of the water pump, water riser, and water seal pipe section according to the technical parameters of the water pump; (3) Determine the dimensions: According to the water pump inlet diameter and structure size determination principle, the water riser diameter d2, the water seal pipe section body, the horizontal liquid inlet pipe, and the horizontal liquid inlet short pipe diameter d are determined 348 ; According to the initial position of the water pump, the underwater riser and the water seal pipe segment body, the height h2 above the horizontal plane in the underwater riser and the length L of the horizontal pipe segment are determined 16 , the length L of the vertical pipe segment 20 , the length L of the flange short segment 22 , the curvature radius A of each elbow Calculate the total water volume V between the overflow surface of the water seal pipe section and the inlet flange of the water pump. s The water volume V of the empty space between the horizontal plane inside the water riser and the overflow surface of the water seal pipe section is as follows: w ; According to V s With V w Determine the minimum total length L of the horizontal inlet pipe and the horizontal inlet short pipe. 48 .

4. The method for determining the installation dimensions of a water pumping device as described in claim 3, characterized in that, The V s ≥3V w When the V s =3V w At that time, the minimum total length L of the horizontal inlet pipe and the horizontal inlet short pipe is obtained. 48 .

5. The method for determining the installation dimensions of a water pumping device as described in claim 3, characterized in that, This also includes determining the maximum allowable installation height H of the water pump based on the total length L of the inlet pipe section. Szmax According to H Szmax Determine the standard surface height h for the installation height of the water seal pipe section. 17 .

6. The method for determining the installation dimensions of a water pumping device as described in claim 5, characterized in that, The maximum allowable installation height H of the water pump Szmax The method for determining it is as follows: H Szmax ≤[H S ]-(∑h S +v S 2 / 2g); Among them: [H S ] represents the permissible suction vacuum level specified by the pump manufacturer; ∑h S For hydraulic losses in the suction pipe; v S 2 / 2g represents the head loss at the pump inlet velocity; v S The average flow velocity at the inlet is g; g is the acceleration due to gravity. ∑h S =λ·(L / D)·v S 2 / (2g)+(∑ζ)·v S 2 / (2g); Where: λ·(L / D)·v S 2 / (2g) represents the friction loss along the pipeline; (∑ζ)·v S 2 / (2g) is the sum of local resistance losses in the pipeline; λ is the friction coefficient; L is the total length of the inlet pipe section; v S ζ represents the average flow velocity of water across the pipe cross-section (m / s); D represents the calculated inner diameter of the pipe; and ζ represents the local hydraulic loss coefficient of the pipe.

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