Dual-purpose centrifugal pump system with self-suction function

Abstract

The invention provides a dual-purpose centrifugal pump system with a self-suction function, belongs to the technical field of centrifugal pumps, and solves the problem in the prior art that sewage suction can be influenced by arranging a bottom valve. The device comprises a centrifugal pump volute, the centrifugal pump volute is connected with a drainage pipe, the drainage pipe is communicated with a water outlet pipe and a water injection exhaust pipe, the centrifugal pump volute is provided with a water injection port connected with the water injection exhaust pipe, a normally-open one-way valve is arranged in the water injection exhaust pipe, and the horizontal height of the normally-open one-way valve is larger than that of the highest position of the drainage pipe. A suction pipe is arranged at the axis of the centrifugal pump volute, and the horizontal height of the highest position of the suction pipe is larger than that of the centrifugal pump volute. When the centrifugal pump is used for the first time, water is injected into the centrifugal pump volute through the water injection and exhaust pipe, gas is exhausted, the injected water can be reserved in the centrifugal pump volute, and it is guaranteed that the centrifugal pump achieves the self-suction function later; backflow of liquid can be prevented without a bottom valve, and the phenomenon that work of the centrifugal pump is affected by blockage of the bottom valve is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal pumps, in particular to a dual-purpose centrifugal pump system with a self-priming function. Background Art

[0002] A self-priming centrifugal pump is a mechanical device that uses the centrifugal force generated by the rotation of an impeller to transport liquid. Its working principle is as follows: before the pump starts working, the pump body and suction pipe must be filled with water to create a vacuum. When the impeller rotates rapidly, the blades cause the water to spin rapidly. The spinning water is ejected from the impeller under the action of centrifugal force, and a vacuum area is formed in the center of the impeller. The water from the water source is pressed into the suction pipe through the pipe network under the action of atmospheric pressure, and this cycle achieves continuous pumping.

[0003] Existing self-priming centrifugal pumps require a bottom valve when pumping clean water. The bottom valve is a check valve that prevents the liquid injected before startup from flowing out of the pump. It also acts as a one-way valve to prevent the water in the pump inlet pipe from flowing back into the pool when the pump is stopped, causing the inlet pipe to be empty and affecting the suction of clean water. After pumping sewage, a centrifugal pump with a bottom valve will be blocked by sludge and cannot open normally during the next suction cycle, affecting the normal operation of the centrifugal pump. Therefore, it is necessary to design a dual-purpose centrifugal pump system that can be used for both clean water and sewage. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a dual-purpose centrifugal pump system with a self-priming function. When used for the first time, water is injected into the centrifugal pump volute and gas is discharged through the water injection and exhaust pipe. Because the horizontal height of the highest point of the suction pipe is greater than the horizontal height of the centrifugal pump volute, the injected water will remain in the centrifugal pump volute, ensuring that the centrifugal pump can realize the self-priming function in the future; the normally open one-way valve is closed by water pressure control after the gas is discharged, and the transported water flow can only be output from the water outlet pipe to realize the normal transportation of the liquid; the present application can prevent the backflow of the liquid without the use of a bottom valve, thereby avoiding the blockage of the bottom valve affecting the operation of the centrifugal pump.

[0005] The technical solution adopted in the present invention is as follows: A dual-purpose centrifugal pump system with a self-priming function includes a centrifugal pump volute, the centrifugal pump volute is connected to a drain pipe, the drain pipe is connected to a water outlet pipe and a water injection and exhaust pipe, the centrifugal pump volute is provided with a water injection port connected to the water injection and exhaust pipe, the water injection and exhaust pipe is provided with a normally open one-way valve, and the horizontal height of the normally open one-way valve is greater than the horizontal height of the highest point of the drain pipe, a suction pipe is provided at the axis center of the centrifugal pump volute, and the horizontal height of the highest point of the suction pipe is greater than the horizontal height of the centrifugal pump volute; the drain pipe is provided with a valve located between the water injection and exhaust pipe and the water outlet pipe, the lowest point of the water injection and exhaust pipe is connected to a sewage pipe, and a sealing nut is threaded on the pipe mouth of the sewage pipe.

[0006] Preferably, the normally open one-way valve includes a fixed ring fixed in the water injection and exhaust pipe, a sealing plate is hinged at the bottom of the fixed ring, and a block for maintaining the sealing plate in an inclined state is fixedly provided at the bottom of the fixed ring.

[0007] Preferably, a mesh cover is provided on the mouth of the suction pipe.

[0008] Preferably, a rotary drive device is connected to the axis of the centrifugal pump volute, and the rotary drive device is connected to the impeller located in the centrifugal pump volute through a drive shaft. A mechanical sealing device that cooperates with the drive shaft of the rotary drive device is installed on the centrifugal pump volute.

[0009] Preferably, the rated power of the rotary drive device is 7.5KW, the inner diameter of the pump head of the centrifugal pump volute is 215mm, the outer diameter of the water outlet of the centrifugal pump volute is 63mm, the outer diameter of the impeller is 214mm, the outer width of the flow channel of the impeller is 7mm, the inner width of the flow channel of the impeller is 13mm, and six long blades and six short blades are provided on the impeller, and the long blades and the short blades are arranged alternately, and the center distance of the short blades is 105mm.

[0010] Preferably, the rotary drive device is an electric motor or an internal combustion engine, and the connection between the rotary drive device and the impeller is a separate type or a direct connection type.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: When used for the first time, water is injected into the volute of the centrifugal pump through the water injection and exhaust pipe and the gas is discharged. Because the horizontal height of the highest point of the suction pipe is greater than the horizontal height of the centrifugal pump volute, the injected water will remain in the volute of the centrifugal pump, ensuring that the centrifugal pump can realize the self-priming function in the future; the normally open one-way valve is controlled to close by water pressure after the gas is discharged, and the transported water flow can only be output from the water outlet pipe to realize the normal transportation of the liquid; the present application does not need to use a bottom valve to prevent the backflow of the liquid, thereby avoiding the blockage of the bottom valve affecting the operation of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 A schematic diagram of the main structure provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a normally open one-way valve provided in an embodiment of the present invention; Figure 3 A schematic diagram of the left-view structure of an embodiment of the present invention.

[0014] Figure numerals: 1- centrifugal pump volute; 2- drain pipe; 3- outlet pipe; 4- water injection and exhaust pipe; 5- normally open one-way valve; 501- fixing ring; 502- sealing plate; 503- block; 6- valve; 7- water inlet; 8- sewage pipe; 9- suction pipe; 10- mesh cover; 11- rotary drive device; 12- mechanical sealing device. DETAILED DESCRIPTION

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] The following combination Figure 1-Figure 3 The present invention is described in detail.

[0019] Example A dual-purpose centrifugal pump system with a self-priming function includes a centrifugal pump volute 1, the centrifugal pump volute 1 is connected to a drain pipe 2, the drain pipe 2 is connected to a water outlet pipe 3 and a water injection and exhaust pipe 4, the centrifugal pump volute 1 is provided with a water injection port 7 connected to the water injection and exhaust pipe 4, a normally open one-way valve 5 is provided in the water injection and exhaust pipe 4, and the horizontal height of the normally open one-way valve 5 is greater than the horizontal height of the highest point of the drain pipe 2, a suction pipe 9 is provided at the axis center of the centrifugal pump volute 1, and the horizontal height of the highest point of the suction pipe 9 is greater than the horizontal height of the centrifugal pump volute 1.

[0020] like Figure 1 As shown, when used for the first time, water is injected into the centrifugal pump volute 1 through the water injection and exhaust pipe 4 and the gas is discharged. Because the horizontal height of the highest point of the suction pipe 9 is greater than the horizontal height of the centrifugal pump volute 1, the injected water will remain in the centrifugal pump volute 1, ensuring that the centrifugal pump can realize the self-priming function in the future; after the gas is discharged, the normally open one-way valve 5 is automatically closed due to the water pressure, and the transported water flow can only be output from the water outlet pipe 3, realizing the normal transportation of the liquid.

[0021] The normally open one-way valve 5 includes a fixed ring 501 fixed in the water injection and exhaust pipe 4. The bottom of the fixed ring 501 is hinged with a sealing plate 502. The bottom of the fixed ring 501 is fixed with a stopper 503 for maintaining the sealing plate 502 in an inclined state. The stopper 503 can keep the sealing plate 502 tilted downward (the tilt angle is 30°-45°). When water is injected, the normally open one-way valve 5 is in the open state, and the gas in the centrifugal pump volute 1 can be discharged from the normally open one-way valve 5 to the water injection and exhaust pipe 4. The sealing plate 502 can be made of a buoyant material and has a hollow design to further increase buoyancy. When the water level rises, the sealing plate 502 is deflected upward due to the buoyancy and water pressure, and adheres to the lower surface of the sealing plate 502, thereby achieving automatic closing of the normally open one-way valve 5.

[0022] The drain pipe 2 is provided with a valve 6 located between the water injection and exhaust pipe 4 and the outlet pipe 3. The valve 6 can be manually or automatically controlled. After water is injected, the valve 6 is opened and the centrifugal pump is started. When the centrifugal pump is operating, air is discharged from the normally open check valve 5. When the water flow stabilizes (no air is discharged), the normally open check valve 5 for water flow control is closed. At this time, the valve 6 is closed, so that the water pumped from the centrifugal pump volute 1 flows only from the drain pipe 2 to the outlet pipe 3. At this time, the centrifugal pump enters a high-efficiency operating state.

[0023] The lowest point of the water injection exhaust pipe 4 is connected with a sewage pipe 8, and a sealing nut is threaded on the pipe mouth of the sewage pipe 8. When the suction force is not enough to pump sewage, it is necessary to open the sealing nut and clean the blocked debris from the sewage pipe 8 to ensure the normal operation of the centrifugal pump.

[0024] A mesh cover 10 is provided on the pipe mouth of the suction pipe 9. The mesh cover 10 can filter foreign matter and avoid clogging the suction pipe 9.

[0025] A rotary drive device 11 is connected to the axis of the centrifugal pump volute 1. This drive device 11 is connected to an impeller (not shown) located within the centrifugal pump volute 1 via a drive shaft. A mechanical seal 12 is mounted on the centrifugal pump volute 1, which cooperates with the drive shaft of the rotary drive device 11. The rotary drive device 11 is an electric motor or an internal combustion engine. When the rotary drive device 11 is an electric motor, it is a three-phase motor. The connection between the rotary drive device 11 and the impeller is either separate or direct. Separately, the drive shaft of the rotary drive device 11 is connected to the impeller via a coupling, while the direct connection is directly connected. The mechanical seal 12 is conventional. While the drive shaft of the rotary drive device 11 drives the impeller, the mechanical seal 12 seals the gap between the drive shaft and the centrifugal pump volute 1 to prevent liquid leakage. For either clean water or sewage pumping, the impeller blades are selected: open blades for sewage and closed blades for clean water. Therefore, in actual use, the appropriate impeller is selected based on the material being pumped.

[0026] The present application sets parameters within the rated effective power of the centrifugal pump to highlight the high efficiency rating while maintaining the working condition within the full head without overload. This requires a specially designed centrifugal pump impeller that has both a high head and high efficiency rating and a low head safety value. Therefore, the rated power of the rotary drive device 11 is set to 7.5KW, the inner diameter of the pump head of the centrifugal pump volute 1 is 215mm, the outer diameter of the water outlet of the centrifugal pump volute 1 is 63mm, the outer diameter of the impeller is 214mm, the outer width of the flow channel of the impeller is 7mm, the inner width of the flow channel of the impeller is 13mm, and the impeller is provided with six long blades and six short blades, and the long blades and the short blades are arranged alternately, and the center distance of the short blades is 105mm.

[0027] The test was conducted using a three-phase 7.5 kW centrifugal pump with the following parameters: Single impeller high head model: head 40 meters, flow rate 27 cubic meters, current 14 amps; head 60 meters, flow rate 25 cubic meters, current 14.7 amps; head 65 meters, flow rate 20 cubic meters, current 13.2 amps; head 67 meters, flow rate 15 cubic meters, current 12.3 amps; Single impeller standard model: head 18 meters, flow 43 cubic meters, current 14.3 amps; head 30 meters, flow 40 cubic meters, current 15 amps; head 40 meters, flow 38 cubic meters, current 15 amps; head 50 meters, flow 35 cubic meters, current 15 amps; Comparing the above two test parameters of the existing 7.5 kW horizontal single impeller, the parameters are head 50 meters and flow rate 25 cubic meters; the standard version of this application has a head of 50 meters and a flow rate of 35 cubic meters, and the high head version has a head of 60 meters and a flow rate of 25 cubic meters.

[0028] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-purpose centrifugal pump system with a self-priming function, comprising a centrifugal pump volute (1), wherein the centrifugal pump volute (1) is connected to a drain pipe (2), and is characterized in that: The drainage pipe (2) is connected to a water outlet pipe (3) and a water injection and exhaust pipe (4); a water injection port (7) connected to the water injection and exhaust pipe (4) is provided on the centrifugal pump volute (1); a normally open one-way valve (5) is provided in the water injection and exhaust pipe (4); the normally open one-way valve (5) is located at a level greater than the level of the highest point of the drainage pipe (2); a suction pipe (9) is provided at the axis of the centrifugal pump volute (1); the level of the highest point of the suction pipe (9) is greater than the level of the centrifugal pump volute (1); a valve (6) is provided on the drainage pipe (2) between the water injection and exhaust pipe (4) and the water outlet pipe (3); a sewage pipe (8) is connected to the lowest point of the water injection and exhaust pipe (4); a sealing nut is provided on the pipe mouth of the sewage pipe (8).

2. A dual-purpose centrifugal pump system with self-priming function according to claim 1, characterized in that: The normally open one-way valve (5) comprises a fixing ring (501) fixed in the water injection and exhaust pipe (4), a sealing plate (502) being hingedly connected to the bottom of the fixing ring (501), and a stopper (503) for maintaining the sealing plate (502) in an inclined state being fixedly provided at the bottom of the fixing ring (501).

3. A dual-purpose centrifugal pump system with self-priming function according to claim 1, characterized in that: A mesh cover (10) is provided on the pipe opening of the suction pipe (9).

4. A dual-purpose centrifugal pump system with self-priming function according to claim 1, characterized in that: A rotary drive device (11) is connected to the axis of the centrifugal pump volute (1), and the rotary drive device (11) is connected to an impeller located in the centrifugal pump volute (1) via a drive shaft. A mechanical sealing device (12) is installed on the centrifugal pump volute (1) and cooperates with the drive shaft of the rotary drive device (11).

5. A dual-purpose centrifugal pump system with self-priming function according to claim 4, characterized in that: The rated power of the rotary drive device (11) is 7.5KW, the inner diameter of the pump head of the centrifugal pump volute (1) is 215mm, the outer diameter of the water outlet of the centrifugal pump volute (1) is 63mm, the outer diameter of the impeller is 214mm, the outer width of the flow channel of the impeller is 7mm, the inner width of the flow channel of the impeller is 13mm, and the impeller is provided with six long blades and six short blades, and the long blades and the short blades are arranged alternately, and the center distance of the short blades is 105mm.

6. A dual-purpose centrifugal pump system with self-priming function according to claim 4, characterized in that: The rotary drive device (11) is a motor or an internal combustion engine, and the connection between the rotary drive device (11) and the impeller is a separate type or a direct connection type.

Images