A flow-increasing and resistance-reducing water pump

Abstract

The application relates to the technical field of water pump resistance reduction, in particular to a flow-increasing and resistance-reducing water pump, which is provided with not less than three guide plates in the outlet area of the water pump along the tangential direction of rotation of the impeller, and a guide opening for guiding the liquid flow direction driven by the centrifugal force of the impeller is formed between the adjacent guide plates. The water pump is provided with multiple mutually cooperating guide plates in the outlet area close to the water outlet in the water pump, the guide opening formed between the guide plates is used for non-closed blocking of the liquid flow direction driven by the centrifugal force of the impeller, the centrifugal force liquid flow direction is cut, combed and guided by the guide plates, the flow directions of the two are not obviously interfered in the nearly vertical direction, the liquid flow resistance at the water outlet is reduced, the outlet lift of the water pump is finally improved, and the technical effect of flow increase and resistance reduction is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pump resistance reduction, in particular to a flow-increasing and resistance-reducing water pump. BACKGROUND

[0002] A water pump is a machine for conveying liquid or increasing the pressure of liquid. It transmits mechanical energy or other external energy to liquid, so that the energy of liquid is increased, and is mainly used for conveying liquid including water, oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal, etc. It can also convey liquid, gas mixture and liquid containing suspended solid. The technical parameters of water pump performance include flow rate, suction lift, head, shaft power, water power and efficiency, etc. According to different working principles, it can be divided into centrifugal pump, axial flow pump and mixed flow pump, etc.

[0003] For various types of water pumps, the upgrading and optimization of the design in the process need to consider the upgrading and research of various performances of the water pump.

[0004] In the research and development process, the most commonly used centrifugal pump is taken as the research and development type. Before the water pump starts, the pump and the water inlet pipe are filled with water. Under the action of the centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller flow passage is thrown to the surrounding, and is pressed into the volute. The inlet of the impeller forms a vacuum, and the water in the water tank is sucked into the space under the atmospheric pressure along the suction pipe to replenish the space, and then the sucked water is thrown out by the impeller and enters the water outlet pipe through the volute. The various resistances existing in the use process are optimized, such as the friction resistance caused by the friction of the liquid flowing through the internal components of the water pump, the liquid flow resistance caused by the liquid flowing through the local components such as pipe bends, expansion or contraction parts and valves, and the liquid flow resistance caused by unreasonable design of the impeller, so as to improve the performance parameters of the centrifugal water pump, so as to achieve the technical effect of increasing flow and reducing resistance.

[0005] As mentioned above, the centrifugal pump is called centrifugal pump because the water is lifted to a high place under the action of the centrifugal force generated by the high-speed rotation of the impeller. Therefore, the liquid flow in the centrifugal water pump during the water pumping process is tested and analyzed, as shown in the drawings. Figure 1 As shown in the drawings, at the A area of the outlet in the water pump, it can be clearly seen that the liquid flow direction (indicated by the hollow arrow in the figure) driven by the centrifugal force of the impeller is obviously interfered with the liquid flow direction (indicated by the solid arrow in the figure) of the water pump outlet. The nearly vertical flow direction interference will affect the outlet head of the centrifugal pump, which is one of the main reasons why the outlet head of the centrifugal water pump cannot reach the rated dust during normal use.

[0006] To this end, in order to avoid the flow to the interference, we intuitively adopt the simple arc baffle 100 way to block the liquid flow direction driven by the centrifugal force of the impeller, as shown in the drawings Figure 2 The arc baffle 100 blocks the liquid flow direction at the internal outlet A area, preventing the liquid flow direction from interfering with each other, but through multiple test tests before and after the blocking, the outlet head is found to be reduced instead of increased, which undoubtedly does not bring the effect of reducing the liquid flow resistance. Therefore, the liquid flow direction of the two cannot be simply blocked to reduce the flow interference of the two, so in order to solve the problem of liquid flow resistance caused by the flow interference at the internal outlet A area, the flow interference of the two at the area still needs to be optimized to achieve the technical effect of increasing flow and reducing resistance, thereby improving the head of the centrifugal water pump. SUMMARY

[0007] The purpose of the present application is to provide a flow-increasing and resistance-reducing water pump to solve the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] A flow-increasing and resistance-reducing water pump for reducing the liquid flow resistance at the outlet of the water pump, the water pump comprising a pump body and a rotating motor for driving the pump body to generate a centrifugal force, the pump body comprising a pump shell and an impeller arranged inside the pump shell, the pump shell being provided with a water outlet and a water inlet, and at least three guide plates being arranged in the outlet area of the water pump along the tangential direction of the rotation of the impeller, the guide plates being arranged in a stepped manner along the tangential direction of the rotation of the impeller, so that the guide plates form stepped guide openings between adjacent guide plates.

[0010] Preferably, the guide plates are arranged in a stepped manner along the tangential direction of the rotation of the impeller, so that the guide plates form stepped guide openings between adjacent guide plates.

[0011] Preferably, the guide plates are arranged in a stepped manner along the tangential direction of the rotation of the impeller, so that the guide plates form stepped guide openings between adjacent guide plates.

[0012] Preferably, the guide plates are arranged in a stepped manner along the tangential direction of the rotation of the impeller, so that the guide plates form stepped guide openings between adjacent guide plates.

[0013] Preferably, a liquid passing cavity is formed in the guide plate, and a guide groove is formed in the liquid passing cavity close to the impeller.

[0014] A water guide hole is formed in the inner wall of the liquid passing cavity, and the water guide hole is communicated with an overflow hole formed in the side wall of the guide plate away from the impeller through an internal guide channel.

[0015] Preferably, a curved plate is arranged in the gap port structure, and a flow guide plate is arranged on the side of the curved plate away from the impeller.

[0016] Preferably, a tapered plate for breaking flow is arranged on the flow guide plate away from the water outlet.

[0017] Compared with the prior art, the beneficial effects of the present application are: the present application is arranged with multiple cooperating flow guide plates near the outlet area of the water pump outlet, and the flow guide ports formed between the flow guide plates are used for non-closed blocking of the liquid flow direction driven by the centrifugal force of the impeller. The centrifugal force liquid flow direction is cut, combed and guided by the flow guide plates, so that the liquid flow direction driven by the centrifugal force of the impeller can be merged without resistance after being processed by the flow guide plates, so that the flow direction of the two in the outlet area of the water pump inside the pump shell will not be disturbed in the nearly vertical direction, thereby reducing the liquid flow resistance at the water outlet, finally improving the outlet head of the water pump, and achieving the technical effect of increasing flow and reducing resistance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the internal liquid flow direction of the centrifugal water pump in the prior art;

[0019] Figure 2 is a schematic diagram of the liquid flow direction of the water pump internal outlet A area directly using an arc-shaped partition plate for closed blocking;

[0020] Figure 3 is a schematic diagram of the pump shell inside the present application installed with a stepped flow guide plate structure;

[0021] Figure 4 is a schematic diagram of the stepped port structure formed by the stepped flow guide plate of the present application;

[0022] Figure 5 is a schematic diagram of the overall structure of the stepped flow guide plate of the present application;

[0023] Figure 6 is a schematic diagram of the cross-sectional view of the stepped flow guide plate of the present application;

[0024] Figure 7 is Figure 6 is an enlarged schematic diagram of the B area structure;

[0025] Figure 8 is a schematic diagram of the internal liquid flow direction when the stepped flow guide plate structure of the present application is installed;

[0026] Figure 9 is a schematic diagram of the liquid flow direction guided by the stepped flow guide plate of the present application in the outlet A area of the water pump;

[0027] Figure 10 The schematic diagram of the interval guide plate structure installed inside the pump shell of the present application;

[0028] Figure 11 The schematic diagram of the gap structure formed by the interval guide plate of the present application;

[0029] Figure 12 The schematic diagram of the axial view of the overall structure of the interval guide plate of the present application;

[0030] Figure 13 The schematic diagram of the cross-sectional view of the interval guide plate of the present application;

[0031] Figure 14 The Figure 13 The enlarged schematic diagram of the structure of the C area;

[0032] Figure 15 The schematic diagram of the curved plate and the guide plate structure of the present application;

[0033] Figure 16 The schematic diagram of the liquid flow direction inside the pump when the interval guide plate structure is installed in the present application;

[0034] Figure 17 The schematic diagram of the guidance of the liquid flow direction by the interval guide plate in the outlet A area inside the water pump of the present application;

[0035] Figure 18 The schematic diagram of the cone plate structure installed in the guide plate of the present application;

[0036] Figure 19 The schematic diagram of the overall structure of the centrifugal water pump for head test of the present application.

[0037] In the figure: 1, pump shell; 11, water outlet; 12, water inlet; 2, impeller; 3, guide plate; 301, step opening; 302, gap opening; 31, cutting plate; 32, comb plate; 41, liquid passage; 42, guide groove opening; 43, water guide hole; 44, guide channel; 45, overflow hole; 5, curved plate; 6, guide plate; 100, arc-shaped partition; 200, cone plate; A, outlet area inside the water pump. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0039] Please refer to Figures 1-19 The present application provides a technical solution:

[0040] A flow-increasing and resistance-reducing water pump is disclosed, which reduces the flow resistance of liquid in the outlet area of ​​the pump, thereby increasing the outlet head of the centrifugal water pump. This centrifugal water pump adopts a conventional centrifugal pump structure, including a pump body and a rotating motor for driving the pump body to generate centrifugal force. The rotating motor is fixed by a coupling, and the output shaft of the rotating motor drives the impeller 2 inside the pump body to rotate, thereby generating centrifugal force. The pump body itself includes a pump housing 1 and an impeller 2 disposed inside the pump housing 1. Although the structure of the impeller 2 can also affect the fluid resistance inside the pump, this application does not optimize or improve the structure of the impeller 2. Therefore, in this embodiment, the impeller 2 is only selected as a conventional technical means, using an impeller 2 of appropriate size and type to generate centrifugal force for pumping operation. An outlet 11 and an inlet 12 are provided on the pump housing 1. The inlet 12 is connected to the liquid through a pipeline for water intake, and the outlet 11 is used to pump the liquid out after pumping treatment. The improvement and optimization of the internal structure of the pump housing 1 in this invention is mainly to solve the problem of liquid flow direction driven by the centrifugal force of the impeller (see attached diagram). Figure 1 (As shown by the hollow arrow), and the direction of liquid flow at the water pump outlet (see attached diagram). Figure 1 The near-perpendicular flow direction interference between the two (as indicated by the solid arrow) affects the outlet head of the centrifugal water pump. To address this technical problem, the present invention addresses this issue in the outlet region of the pump casing 1 (i.e., near the outlet 11), and along the rotational tangent direction of the impeller 2 (as shown in the attached diagram). Figure 2 At the location of the arc-shaped baffle 100 shown, at least three guide plates 3 are arranged in sequence. Instead of using a fully enclosed arc-shaped baffle 100 to block the liquid flow driven by the centrifugal force of the impeller, a guide port is formed between adjacent guide plates 3 to guide the liquid flow driven by the centrifugal force of the impeller 2. This prevents significant near-vertical flow interference between the two liquid flows at the outlet A area inside the water pump, thereby reducing the liquid flow resistance at the outlet and ultimately increasing the pump outlet head.

[0041] In the design process of the guide plate 3 in this invention, the influence of the structure and installation position of the guide plate 3 on the liquid flow direction was fully considered. During the design, the installation position of the guide plate 3 was adjusted in various ways, and the head test was carried out on the adjusted structure. Finally, the following two technical solutions for the installation of the guide plate 3 were determined to achieve the technical effect of reducing resistance and increasing flow, and to improve the head of the centrifugal water pump.

[0042] Example 1:

[0043] As per the instruction manual Figures 3-9As shown, three guide plates 3 are installed at the outlet A area inside the water pump. The three guide plates 3 do not contact each other. The two ends of the guide plates 3 are fixed to the inner wall of the pump housing 1 and sealed at both ends. The installation position of the guide plates 3 is arranged in a stepped manner along the rotation tangent direction of the impeller 2, so that there is a gap between adjacent guide plates 3, thus forming the shape shown in the attached figure. Figure 4 The flow guide port of the stepped opening 301 structure shown has a size of 0.8cm-1cm, that is, the vertical distance between adjacent guide plates 3 is about 1cm. Under the flow guidance conditions of this stepped opening 301 structure, the liquid flow driven by the centrifugal force of the impeller 2 is guided.

[0044] As per the instruction manual Figures 5-7 As shown, a sliding plate 31 with an arc shape is provided on the side of the guide plate 3 near the impeller 2. The sliding plate 31 is arc-shaped, and the central angle of the arc-shaped sliding plate 31 is located on the side of the impeller 2, so that the liquid flows along the arc direction and adheres to the surface of the guide plate 3 after passing through the sliding plate 31. On the other side of the guide plate 3, a comb plate 32 is provided to guide the flow direction of the liquid at the guide port. The comb plate 32 is located on the side wall of the guide plate 3 on the other side. The comb plate 32 is also arc-shaped, and the central angle of the arc-shaped comb plate 32 is located on the side near the outlet 11, so that the liquid flows upward along the arc direction after passing through the comb plate 32 and merges with the liquid outlet flow direction, no longer causing mutual interference. The lengths of both ends of the comb plate 32 and the sliding plate 31 are the same as the length of the guide plate 3. The thickness of the guide plate 3 is selected to be 2-4 cm thick. Too thick will affect the liquid flow direction, and too thin will affect the service life of the guide plate 3. Regarding the centrifugal force of the liquid flowing towards the shear plate 31, a portion will directly flow into the guide channel 42 area of ​​the guide plate 3. The significance of opening the liquid cavity 41 is to guide this portion of the liquid flow. The liquid is pushed into the liquid cavity 41, and under the action of thrust and pressure difference, it flows along the guide hole 43, through the guide channel 44, and out of the overflow hole 45. The outflowing liquid flows upward, which can better merge with the liquid flow of the water pump outlet, making it less likely to interfere with each other and reducing liquid resistance. Furthermore, the guide port of the stepped opening 301 structure allows adjacent guide plates 3 to cooperate with each other. When the guide plate 3 on the right receives the liquid flow brought by centrifugal force, a portion of it flows towards the stepped opening 301 along the arc direction through the shearing effect of the shear plate 31, and finally through the combing action of the comb plate 32, so that the liquid flow is upward, which can better merge with the liquid flow of the water pump outlet.

[0045] As per the instruction manual Figures 8-9 As shown, the liquid driven by the centrifugal force of impeller 2 is thrown outward in the direction of impeller 2's rotation (see attached diagram). Figure 8(As shown by the hollow arrow), this portion of the liquid flows after the guide vane 3, and then... Figure 9 The liquid flow is guided in the direction indicated by the middle arrow, ultimately ensuring that the liquid flow in this portion of the deflector plate 3 flows upwards towards the outlet 11. This prevents the liquid from flowing vertically and interfering with the liquid flow at the pump outlet as it would when the deflector plate 3 is not installed. (See attached image) Figure 8 (As indicated by the solid arrow).

[0046] Example 2:

[0047] As per the instruction manual Figures 10-17 As shown, three guide plates 3 are installed at the outlet A area inside the water pump. The three guide plates 3 do not contact each other. The two ends of the guide plates 3 are fixed to the inner wall of the pump housing 1 and sealed at both ends. The installation positions of the guide plates 3 are spaced apart along the rotation tangent direction of the impeller 2. The three guide plates 3 are on the same arc surface, leaving gaps between adjacent guide plates 3, thus forming the shape shown in the attached figure. Figure 11 The guide port of the gap port 302 structure shown has a size of 1.0cm-1.2cm, that is, the vertical distance between adjacent guide plates 3 is about 1cm. Under the guidance conditions of this gap port 302 structure, the liquid flow driven by the centrifugal force of the impeller 2 is guided.

[0048] As per the instruction manual Figures 12-15As shown, the flow guide plate 3 is provided with a cutting plate 31 close to the impeller 2 side, the cutting plate 31 is arc-shaped, and the corresponding central angle of the arc-shaped cutting plate 31 is located on the impeller 2 side, so that the liquid flows along the arc direction and adheres to the surface of the flow guide plate 3 after passing through the cutting plate 31. The other side of the flow guide plate 3 is provided with a comb plate 32 for guiding the liquid flow direction at the flow guide port. The comb plate 32 is arranged at the side wall of the flow guide plate 3 on the other side, and the comb plate 32 is also arc-shaped. The corresponding central angle of the arc-shaped comb plate 32 is located close to the water outlet 11 side, so that the liquid flows along the arc direction after passing through the comb plate 32, and the liquid flow direction is upward and integrated with the liquid outlet flow direction, without mutual interference. The length of the comb plate 32 and the cutting plate 31 is the same as the length of the flow guide plate 3. The thickness of the flow guide plate 3 is selected to be 3-4 cm thick. If the thickness is too thick, it will affect the liquid flow direction. If the thickness is too thin, it will affect the service life of the flow guide plate 3. For the centrifugal force liquid flow direction of the cutting plate 31, part of it will directly flow to the flow guide groove 42 area of the flow guide plate 3. The significance of opening the liquid cavity 41 is to guide the flow direction of the part of the liquid. The liquid is pushed into the liquid cavity 41, and under the action of the thrust and pressure difference, it flows out from the overflow hole 45 after passing through the water guide hole 43 and the flow guide channel 44. The flow direction of the outflow liquid is upward, which can better integrate with the liquid flow direction of the water pump liquid outlet and reduce the liquid resistance. Moreover, the gap port 302 structure of the flow guide port can make the adjacent flow guide plates 3 cooperate with each other. When the flow guide plate 3 on the right side receives the liquid flow direction caused by the centrifugal force, part of it flows along the arc direction towards the gap port 302 through the cutting effect of the cutting plate 31, and finally flows through the comb plate 32. The comb flow effect makes the liquid flow direction upward, which can better integrate with the liquid flow direction of the water pump liquid outlet.

[0049] In this embodiment, at the gap port 302 structure, a curved plate 5 is provided. The curved plate 5 is provided with three blocks, as shown in the accompanying drawings. Figure 15 As shown, the curved plate 5 is provided with a drainage plate 6 away from the impeller 2 side. The bending direction of the end of the curved plate 5 cooperates with the arc direction of the drainage plate 6, so that the liquid flow direction after flowing through the curved plate 5 flows out and adheres to the drainage plate 6. After flowing along the drainage plate 6, the liquid flow direction has a tendency to flow towards the comb plate 32, and the comb flow effect of the comb plate 32 makes the liquid flow direction flow upward.

[0050] As shown in the accompanying drawings, Figures 16-17 As shown, the liquid flow direction driven by the centrifugal force of the impeller 2 is thrown outwards along the rotation direction of the impeller 2 (as shown by the hollow arrow), and part of the liquid flow direction is thrown towards the flow guide plate 3. After being thrown towards the flow guide plate 3, the part of the liquid flow direction passes through the gap port 302 and the gap port 302 structure of the flow guide plate 3, and then flows out from the overflow hole 45 after passing through the water guide hole 43 and the flow guide channel 44. Figure 16 Figure 17 ​The liquid flow is guided in the direction indicated by the middle arrow, and finally the part of the liquid flow that is thrown to the guide plate 3 all presents a flow direction upward to the water outlet 11, which does not directly interfere with the liquid flow direction of the water pump liquid outlet in a vertical state as when the guide plate 3 is not installed (see FIG. 2). Figure 16 The middle solid arrow indicates.

[0051] As shown in the description Figure 18 When the thickness of the guide plate 3 is selected to be 4cm or more, in order to better break the flow and prevent the thickness of the guide plate 3 from blocking the liquid flow direction, a conical plate 200 for breaking the flow is provided on the guide plate 3 away from the water outlet 11. The conical arrangement can reduce the blocking of the liquid flow direction by the thickness of the guide plate 3.

[0052] Test of lift:

[0053] In order to prove that the guide plate 3 and its additional technical solutions adopted in the two specific embodiments of the present application have a significant improvement effect on reducing resistance and increasing the lift of the water pump, specific centrifugal pump lift tests are conducted on the above two embodiments. The most commonly used and simple lift test method in the field is adopted.

[0054] First, the same type of centrifugal pump is selected, and the type is selected as the IHW40-100 type centrifugal pump produced by Zhejiang Jiujiang Pump Industry Co., Ltd. The rated parameters are: rated lift 12.5m, rated flow 6.3m 3 / h, rated power 0.75kw.

[0055] As shown in the description Figure 19 The water inlet 12 is arranged so that the water inlet surface is kept at the same height as the water inlet 12, and a transparent pipe is connected to the water outlet 11 through a connecting flange, and a measuring tool for measuring the height and parallel distance of the outlet pipe is arranged beside the transparent pipe to measure the lift.

[0056] Measurement 1: The above-mentioned IHW40-100 type centrifugal pump is selected, and no guide plate 3 structure is installed in the centrifugal pump. In the case of setting up the above-mentioned measuring pipe, the centrifugal pump is started to measure the lift. The measurement result is that the outlet lift reaches about 8.4m (there is an error in the measurement, and the average value is taken for multiple times);

[0057] Measurement 2: The above-mentioned IHW40-100 type centrifugal pump is selected, and the guide plate 3 structure in the first embodiment is installed in the centrifugal pump by spot welding and the like. The guide plate 3 structure with a thickness of 3cm is selected for installation. Without changing the above-mentioned measuring pipe, the centrifugal pump is started to measure the lift. The measurement result is that the outlet lift reaches about 9.5m (there is an error in the measurement, and the average value is taken for multiple times);

[0058] Measurement three: select the above IHW40-100 type centrifugal pump, and in the centrifugal pump by spot welding and other ways to install the flow guide plate 3 structure using the structure of example two, select the thickness of 4 cm flow guide plate 3 structure for installation, without changing the above measurement pipeline, start the centrifugal pump to measure the head, the measurement results: the outlet head reaches about 9.3 m (measurement error take the average value for many times).

[0059] According to the above test results, it can be clearly concluded that the results of measurement two and measurement three, compared with the results of measurement one without installing the flow guide plate 3 in the centrifugal pump, the head can be improved by about 1 m, which proves that the fluid resistance is reduced well, and the technical effect of increasing flow and reducing resistance is realized.

[0060] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A flow-increasing and resistance-reducing water pump, used to reduce the liquid flow resistance at the pump outlet, the water pump comprising a pump body and a rotating motor for driving the pump body to generate centrifugal force, the pump body comprising a pump housing (1) and an impeller (2) disposed inside the pump housing (1), the pump housing (1) being provided with an outlet (11) and an inlet (12), characterized in that: At least three guide plates (3) are arranged sequentially in the outlet area of ​​the water pump along the rotation tangent direction of the impeller (2), and a guide port is formed between adjacent guide plates (3) to guide the flow of liquid driven by the centrifugal force of the impeller (2). The guide plate (3) is arranged in a stepped manner along the rotation tangent direction of the impeller (2), so that the guide port formed between adjacent guide plates (3) is set as a stepped port (301) structure; The guide plate (3) has a sliding plate (31) with an arc shape fitting the guide plate (3) on the side close to the impeller (2), and a comb plate (32) for guiding the flow direction of liquid at the guide port is provided on the other side of the guide plate (3). A liquid passage cavity (41) is provided inside the guide plate (3), and a guide groove (42) is provided on the side of the liquid passage cavity (41) near the impeller (2). A water guide hole (43) is provided on the inner side wall of the liquid passage chamber (41). The water guide hole (43) is connected to the overflow hole (45) on the side wall of the guide plate (3) away from the impeller (2) through the internal guide channel (44).

2. The flow-increasing and resistance-reducing water pump according to claim 1, characterized in that: A conical plate (200) for breaking the flow is provided on the guide plate (3) away from the outlet (11).

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