Control system of centrifugal water pump with bottomless valve

Abstract

The invention relates to the technical field of water pumps, in particular to a control system of a centrifugal water pump without a bottom valve.The control system comprises a centrifugal pump, a water tank and a floating ball liquid level meter, a water inlet pipe is fixedly installed at the front end of the centrifugal pump, and a vacuum tank is fixedly connected to the end, away from the centrifugal pump, of the water inlet pipe; a water pumping pipe is fixedly installed at the top of the end, away from the water inlet pipe, of the vacuum tank, a bottomless valve is installed at the lower end of the water pumping pipe and located in the water tank, and the vacuum tank is arranged on one side of the water tank; compared with the prior art, the centrifugal water pump and the inlet of the vacuum tank are improved, and the pipeline and the bottomless valve are additionally arranged, so that the phenomena that an impeller of the centrifugal water pump is blocked and the vacuum tank cannot form vacuum are avoided, maintenance personnel need to overhaul conveniently, the liquid level floating switch is additionally arranged in the water tank, and automatic liquid pumping of the high-liquid-level centrifugal water pump is achieved; and the centrifugal water pump automatically stops working when the liquid level is low, and meanwhile, the workload of operators can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water pumps, and in particular to a control system of a centrifugal water pump with a bottomless valve. Background Art

[0002] A centrifugal water pump is a machine for conveying liquid or pressurizing liquid. Before starting the pump, the pump and the inlet pipe are filled with liquid. After the pump is running, the liquid in the impeller flow channel is thrown into the volute under the action of the centrifugal force generated by the high-speed rotation of the impeller. At this time, a vacuum is formed at the impeller inlet. The liquid in the pool enters the impeller along the suction pipe under atmospheric pressure, and is thrown into the volute by the high-speed rotating impeller. The pump completes the pumping work by repeating this cycle.

[0003] In the past, a check valve was installed at the lower part of the inlet pipe of a centrifugal water pump. During use, the check valve seal failed due to particles and floating objects in the liquid, and the pump could not work without liquid at the inlet end to form a vacuum, or the impeller pump was blocked, resulting in a reduction in the amount of infusion. The operator had to frequently introduce liquid into the pump inlet, and the maintenance personnel had to inspect the check valve seal and clean the dirt in the impeller. For this reason, the present invention proposes a control system for a centrifugal water pump with a bottomless valve. Summary of the invention

[0004] The object of the present invention is to provide a control system for a centrifugal water pump with a bottomless valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a control system of a centrifugal water pump with a bottomless valve, comprising a centrifugal pump, a water tank and a float level gauge, a water inlet pipe is fixedly installed at the front end of the centrifugal pump, the end of the water inlet pipe away from the centrifugal pump is fixedly connected to a vacuum tank, a water suction pipe is fixedly installed on the top of the end of the vacuum tank away from the water inlet pipe, a bottomless valve is installed at the lower end of the water suction pipe, and the bottomless valve is located in the water tank, the vacuum tank is arranged on one side of the water tank, the float level gauge is arranged on the other side of the water tank, and the float level gauge comprises a gravity hammer and a float arranged in the water tank.

[0006] As a preferred technical solution of the present invention, a power supply is provided on one side of the float level gauge, a water pump motor is provided on one side of the centrifugal pump, and the water pump motor is electrically connected to the power supply, and the float level gauge is electrically connected to the water pump motor through a DCS control system.

[0007] As a preferred technical solution of the present invention, the bottomless valve comprises a hollow shell, and a plurality of liquid inlets are provided on the outer surface of the hollow shell, and a filter is fixedly installed on the outer surface of the liquid inlet.

[0008] As a preferred technical solution of the present invention, the water pumping pipe includes a first pipe fixedly connected to the vacuum tank and a second pipe fixedly installed on the upper end of the bottomless valve, and a connecting flange is installed between the first pipe and the second pipe.

[0009] As a preferred technical solution of the present invention, a hand hole flange is provided at the bottom of one side of the vacuum tank.

[0010] As a preferred technical solution of the present invention, a water outlet pipe is fixedly installed on the upper end of the centrifugal pump, a water outlet valve is installed on the water outlet pipe, and a water inlet valve is installed on the water inlet pipe.

[0011] As a preferred technical solution of the present invention, a movably installed floating switch is provided on the gravity hammer, and the floating switch and the float are connected by a connecting rope. The float level gauge includes a first liquid level interval and a second liquid level interval. When the float floats up and pulls the floating switch through the connecting rope, the floating switch will move up and down in the first liquid level interval or the second liquid level interval. When the floating switch moves to the first liquid level interval, the DCS control system controls the water pump motor to power on and run; the float floats down and pulls the floating switch through the connecting rope. When the floating switch moves to the second liquid level interval, the DCS control system controls the water pump motor to power off and stop.

[0012] As a preferred technical solution of the present invention, the first liquid level interval is located above the second liquid level area. When the float pulls the floating switch to the lowest position of the second liquid level area through the connecting rope, the horizontal position of the float at this time is higher than the horizontal height of the liquid inlet.

[0013] As a preferred technical solution of the present invention, a water supply pipe is installed at the upper end of the vacuum tank, and a water supply valve is installed on the water supply pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The control system of a centrifugal water pump with a bottomless valve of the present invention improves the inlet of the centrifugal water pump and the vacuum tank and adds pipelines and bottomless valves to avoid the centrifugal water pump from being unable to form a vacuum and the impeller being blocked. It is also convenient for maintenance personnel to perform maintenance. A liquid level float switch is added in the water tank to realize automatic pumping of liquid by the centrifugal water pump when the liquid level is high and automatic stopping of the centrifugal water pump when the liquid level is low. At the same time, the workload of operators can be effectively reduced.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the bottomless valve of the present invention;

[0019] In the figure: 1. Centrifugal pump; 2. Water inlet pipe; 3. Vacuum tank; 4. Suction pipe; 5. Bottomless valve; 6. Water tank; 7. Float level gauge; 8. Gravity hammer; 9. Float; 10. Power supply; 11. Water pump motor; 12. First pipeline; 13. Second pipeline; 14. Connecting flange; 15. Hand hole flange; 16. Water inlet valve; 17. Water outlet valve; 18. Liquid inlet; 19. Filter. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-2 In the present embodiment, a control system of a centrifugal water pump with a bottomless valve is provided, including a centrifugal pump 1, a water tank 6 and a float level gauge 7. A water inlet pipe 2 is fixedly installed at the front end of the centrifugal pump 1, and a vacuum tank 3 is fixedly connected to the end of the water inlet pipe 2 away from the centrifugal pump 1. A water pumping pipe 4 is fixedly installed on the top of the end of the vacuum tank 3 away from the water inlet pipe 2. A bottomless valve 5 is installed at the lower end of the water pumping pipe 4, and the bottomless valve 5 is located in the water tank 6. The vacuum tank 3 is arranged on one side of the water tank 6, and the float level gauge 7 is arranged on the other side of the water tank 6. The float level gauge 7 includes a gravity hammer 8 and a float 9 arranged in the water tank 6.

[0024] In this embodiment, a power supply 10 is provided on one side of the float level gauge 7, a water pump motor 11 is provided on one side of the centrifugal pump 1, and the water pump motor 11 is electrically connected to the power supply 10, and the float level gauge 7 is electrically connected to the water pump motor 11 through a DCS control system.

[0025] In this embodiment, the bottomless valve 5 includes a hollow shell, and a plurality of liquid inlets 18 are provided on the outer surface of the hollow shell, and a filter screen 19 is fixedly installed on the outer surface of the liquid inlet 18. By providing a plurality of elliptical liquid inlets 18 on the bottomless valve 5 at the bottom of the water suction pipe 4 of the vacuum tank 3, the liquid inlet area is increased, and a 10-mesh stainless steel filter screen 19 is installed on the outside of the liquid inlet 18 to prevent large foreign matter from entering the vacuum tank 3 and the impeller of the centrifugal water pump 1 and causing impeller blockage.

[0026] In this embodiment, the water suction pipe 4 includes a first pipe 12 fixedly connected to the vacuum tank 3 and a second pipe 13 fixedly installed on the upper end of the bottomless valve 5, and a connecting flange 14 is installed between the first pipe 12 and the second pipe 13. By arranging a connecting flange 14 in the middle of the water suction pipe 4, if the filter screen at the bottom is blocked, the connecting flange 14 can be disassembled and the bottomless valve 5 at the bottom can be lifted up for cleaning.

[0027] In this embodiment, a hand hole flange 15 is provided at the bottom of one side of the vacuum tank 3, and when there are foreign matters deposited in the vacuum tank 3, the vacuum tank 3 can be disassembled for cleaning.

[0028] In this embodiment, a water outlet pipe is fixedly installed at the upper end of the centrifugal pump 1 , a water outlet valve 17 is installed on the water outlet pipe, and a water inlet valve 16 is installed on the water inlet pipe 2 .

[0029] In this embodiment, the high and low liquid levels are set according to the process requirements. The high liquid level is the position where the float floats, and the low liquid level is the lowest position where the float floats when the liquid level drops. However, when setting the low liquid level, the liquid level must be higher than the liquid inlet 18 on the bottomless valve 5 to prevent air from entering the vacuum tank 3 due to the low liquid level, destroying the vacuum and causing the centrifugal water pump 1 to be unable to work normally.

[0030] Specifically, a movably installed float switch is provided on the gravity hammer 8, and the float switch and the float ball are connected by a connecting rope. The float ball liquid level gauge 7 includes a first liquid level interval and a second liquid level interval. When the float ball 9 floats up and pulls the float switch through the connecting rope, the float switch will move up and down in the first liquid level interval or the second liquid level interval. When the float switch moves to the first liquid level interval, the DCS control system at this time controls the water pump motor 11 to power on and operate; the float ball 9 floats down and pulls the float switch through the connecting rope. When the float switch moves to the second liquid level interval, the DCS control system at this time controls the water pump motor 11 to power off and stop. The first liquid level interval and are located above the second liquid level area. When the float ball pulls the float switch to the lowest position of the second liquid level area through the connecting rope, the horizontal position of the float ball at this time is higher than the horizontal height of the liquid inlet 18.

[0031] The circuit of the liquid level float switch is connected to the AC contactor and power supply of the centrifugal water pump motor. After debugging, the float will float up when the water level in the pool is high, and the centrifugal water pump will run automatically. When the water level in the pool is low, the float will float down, and the centrifugal water pump will stop running automatically.

[0032] During initial use, the vacuum tank needs to be replenished with liquid through the water replenishment valve on the upper part of the vacuum tank 3. When the liquid is full, it will flow back from the suction pipe of the vacuum tank 3 into the water tank 6. At this time, liquid tumbling will occur in the water tank 6. According to the observation of the tumbling phenomenon, the water replenishment valve can be closed in time, and then the inlet and outlet valves of the centrifugal water pump 1 can be opened, and the switch can be closed to supply power.

[0033] In summary, the present invention improves the inlet of the centrifugal water pump and the vacuum tank and adds pipes and bottomless valves to avoid the phenomenon that the centrifugal water pump impeller is blocked and the vacuum tank cannot form a vacuum. It is also convenient for maintenance personnel to overhaul. A liquid level float switch is added in the water tank to realize automatic pumping of liquid by the centrifugal water pump when the liquid level is high and automatic stopping of the centrifugal water pump when the liquid level is low. At the same time, it can effectively reduce the workload of operators.

[0034] It is worth noting that the entire device is controlled by a main control button. Since the device matched with the control button is a common device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control system for a centrifugal water pump with a bottomless valve, characterized in that: The invention comprises a centrifugal pump (1), a water tank (6) and a float liquid level gauge (7); a water inlet pipe (2) is fixedly installed at the front end of the centrifugal pump (1); an end of the water inlet pipe (2) away from the centrifugal pump (1) is fixedly connected to a vacuum tank (3); a water extraction pipe (4) is fixedly installed at the top of an end of the vacuum tank (3) away from the water inlet pipe (2); a bottomless valve (5) is installed at the lower end of the water extraction pipe (4), and the bottomless valve (5) is located in the water tank (6); the vacuum tank (3) is arranged on one side of the water tank (6); the float liquid level gauge (7) is arranged on the other side of the water tank (6); and the float liquid level gauge (7) comprises a gravity hammer (8) and a float (9) arranged in the water tank (6).

2. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: A power supply (10) is provided on one side of the float level gauge (7), a water pump motor (11) is provided on one side of the centrifugal pump (1), and the water pump motor (11) is electrically connected to the power supply (10), and the float level gauge (7) is electrically connected to the water pump motor (11) via a DCS control system.

3. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: The bottomless valve (5) comprises a hollow shell, and a plurality of liquid inlets (18) are provided on the outer surface of the hollow shell, and a filter screen (19) is fixedly mounted on the outer surface of the liquid inlet (18).

4. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: The water extraction pipe (4) comprises a first pipe (12) fixedly connected to the vacuum tank (3) and a second pipe (13) fixedly installed on the upper end of the bottomless valve (5), and a connecting flange (14) is installed between the first pipe (12) and the second pipe (13).

5. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: A hand hole flange (15) is provided at the bottom of one side of the vacuum tank (3).

6. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: A water outlet pipe is fixedly mounted on the upper end of the centrifugal pump (1), a water outlet valve (17) is mounted on the water outlet pipe, and a water inlet valve (16) is mounted on the water inlet pipe (2).

7. A control system for a centrifugal water pump with a bottomless valve according to claim 2, characterized in that: The gravity hammer (8) is provided with a movably mounted floating switch, and the floating switch and the floating ball are connected by a connecting rope. The floating ball liquid level gauge (7) includes a first liquid level interval and a second liquid level interval. When the floating ball (9) floats up and pulls the floating switch by the connecting rope, the floating switch moves up and down in the first liquid level interval or the second liquid level interval. When the floating switch moves to the first liquid level interval, the DCS control system controls the water pump motor (11) to be powered on and run; when the floating ball (9) floats down and pulls the floating switch by the connecting rope, when the floating switch moves to the second liquid level interval, the DCS control system controls the water pump motor (11) to be powered off and stopped.

8. A control system for a centrifugal water pump with a bottomless valve according to claim 7, characterized in that: The first liquid level interval is located above the second liquid level area. When the float moves to the lowest position of the second liquid level area by pulling the floating switch through the connecting rope, the horizontal position of the float is higher than the horizontal height of the liquid inlet (18).

9. A control system for a centrifugal water pump with a bottomless valve according to claim 1, characterized in that: A water supply pipe is installed at the upper end of the vacuum tank (3), and a water supply valve is installed on the water supply pipe.

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