Vacuumizing node device capable of automatically controlling water level and using method of vacuumizing node device

Abstract

The invention relates to the technical field of vacuum water diversion, in particular to a vacuumizing node device capable of automatically controlling a water level and a using method of the vacuumizing node device. The water pump is connected to the water inlet pipe, is higher than the water inlet pipe and comprises a node tank, and the bottom of the node tank is connected with the water pump; one end of the exhaust pipeline is connected to the top of the node tank, the other end of the exhaust pipeline is connected to the vacuum pump unit, and an electromagnetic valve is arranged on the exhaust pipeline; the liquid level meter is connected with the control system, and the liquid level meter is used for detecting whether water in the node tank reaches the lowest water level and the highest water level or not and sending a detection signal to the control system, so that the control system judges whether the electromagnetic valve is opened or not to extract air in the node tank so as to raise the water level in the node tank. The node tank has the advantages that the lowest water level and the highest water level in the node tank are detected by arranging the liquid level meter, the water level is controlled between the lowest water level and the highest water level, the situation that a single liquid level meter is arranged, an electromagnetic valve is opened after the water level is slightly lowered, and air exhaust is conducted in the node tank is avoided, and frequent opening of the electromagnetic valve is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum water diversion, and in particular to a vacuum node device for automatic water level control and a method for using the device. Background Art

[0002] In modern waterworks, vacuum systems play a vital role in intake and delivery pumphouses, lift stations between the water source and the waterworks, membrane treatment systems in water treatment processes, and siphon pipe systems used to draw water across dams or reservoirs. They extract air from pumps and pipes and fill them with water. In vacuum systems, a vacuum node with automatic water level control at the pump end or the highest point of the siphon pipe becomes a crucial component of automation.

[0003] In most current vacuum systems, the water pump end water pumping pipeline is not equipped with a vacuum node for automatic water level control. It either directly pumps water into the vacuum tank of the central vacuum device through an on-off valve, or installs a tuning fork level gauge on the pipeline at the water pump end to detect whether the water level has reached a certain height. Both cannot achieve the vacuum state of the water pump end. For example, after the tuning fork level gauge detects that water has reached the position, it will immediately close the valve on the pipeline to close the connection with the vacuum pipeline. However, in actual application, when the water in the water pump is pumped, the water that first reaches the tuning fork level gauge is water of mixed gas, and there is still a lot of air that is not sucked up in time. Therefore, the tuning fork level gauge will misjudge and stop pumping water. Secondly, the tuning fork level gauge is installed on the outside of the vacuum tank through a connecting pipe and can only detect the water level of a single height. When the water level drops slightly, it starts to pump air, resulting in the problem of frequent pumping. The above processes cause the automatic control defects of the vacuum state of water pumping. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a vacuum node device with automatic water level control and a method of use thereof, so as to solve the problem that the existing vacuum system is difficult to keep the water pump in a constant water-lifting state.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a vacuum node device for automatic water level control, which is connected to a water pump, which is connected to a water inlet pipe, and the height of the water pump is higher than the height of the water inlet pipe, comprising:

[0007] Node tank, the bottom of which is connected to the water pump;

[0008] The exhaust pipeline has one end connected to the top of the node tank and the other end connected to the vacuum pump unit. A solenoid valve is provided on the exhaust pipeline.

[0009] A liquid level meter and a control system, wherein the liquid level meter includes two float switches spaced apart in an upper and lower manner in the node tank, the two float switches being connected to the control system, the upper and lower float switches being respectively used to detect whether the water in the node tank has reached the lowest water level and the highest water level, and sending a detection signal to the control system. When the control system receives a detection signal that the water level is at the lowest water level, it opens the solenoid valve to allow the vacuum pump unit to pump air into the node tank to raise the water level. When the control system receives a detection signal that the water level has reached the highest water level, it closes the solenoid valve to stop pumping air into the node tank. This cycle enables the control system to open or close the solenoid valve to keep the water level in the node tank between the lowest water level and the highest water level.

[0010] Furthermore, the liquid level meter also includes:

[0011] A connecting rod is vertically arranged in the node tank, the upper end of the connecting rod is fixed to the top surface of the node tank, and two float switches are arranged on the connecting rod at intervals above and below;

[0012] The liquid level gauge protective tube for protecting the float switch is sleeved on the outside of the connecting rod and the upper end is fixed to the top surface of the node tank. A plurality of air holes are evenly opened on the surface of the liquid level gauge protective tube to ensure that water can flow into the liquid level gauge protective tube.

[0013] Furthermore, both float switches include:

[0014] a reed switch embedded in the connecting rod, the reed switch being connected to the control system;

[0015] Two limit plates are fixedly sleeved on the connecting rod, the two limit plates are spaced apart and located above and below the reed switch respectively;

[0016] A magnetic float is slidably mounted on the connecting rod, the magnetic float being located between two limit plates. The magnetic float changes the on / off state of the reed switch by changing its up / down position.

[0017] The detection signal received by the control system is the connectivity signal of the reed switch. When the water level in the node tank is located below the magnetic float, the reed switch below is in a connectivity state, the control system detects the connectivity signal and opens the solenoid valve. When the water level in the node tank rises to the float switch above, the reed switch above is in a connectivity state, the control system detects the connectivity signal and closes the solenoid valve.

[0018] Furthermore, the liquid level gauge further comprises two display lights, which are spaced apart and distributed on the outside of the node tank and connected to the control system;

[0019] When the reed switch below is in a connected state, the control system turns off the display light below, and when it is in a disconnected state, the control system turns on the display light;

[0020] When the upper reed switch is in a disconnected state, the control system turns off the upper display light; when it is in a connected state, the control system turns on the display light.

[0021] Furthermore, the node tank includes:

[0022] Node tank body;

[0023] A water pumping pipe interface connected to the bottom of the node tank body, wherein the water pumping pipe interface is provided with a first valve and is connected to one end of a water pumping pipe, and the other end of the water pumping pipe is connected to the top of the water pump and communicates with the internal chamber;

[0024] The exhaust pipe interface connected to the top of the node tank body is used to connect to the exhaust pipeline.

[0025] Furthermore, the node tank also includes:

[0026] a filter screen provided in the node tank body, the filter screen blocking the communication end between the water pumping pipe interface and the node tank body to filter the water pumped into the node tank body;

[0027] A water stabilizing plate is fixed on the inner wall of the node tank body, and a plurality of through holes are evenly opened on the water stabilizing plate for water circulation.

[0028] Furthermore, the air extraction pipeline includes:

[0029] An exhaust pipe, one end of which is connected to the node tank, and the other end of which is connected to the vacuum pump unit. The solenoid valve is provided on the exhaust pipe to control the on-off of the exhaust pipe;

[0030] A filter connected to the air extraction pipe;

[0031] a second valve connected to the air extraction pipe;

[0032] The two ends of the spare air extraction pipe are connected to the two ends of the air extraction pipe through a three-way pipe, and the spare air extraction pipe is provided with a third valve and a vent valve.

[0033] The present invention also provides a method for using a vacuum node device for automatic water level control, which specifically includes the following steps:

[0034] Providing a vacuum node device as claimed in claim 1;

[0035] Install the node tank above the water pump, connect the bottom of the node tank to the water pump, and place the water inlet pipe in the water source;

[0036] Turning on the automatic control mode of the control system so that the control system activates the solenoid valve, and the vacuum pump unit evacuates air from the node tank to generate negative pressure in the node tank. Under the action of the negative pressure, water enters the node tank through the water inlet pipe and the water pump;

[0037] The liquid level gauge detects whether the water level in the node tank has reached the maximum or minimum level and sends the detection signal to the control system;

[0038] When the water level in the node tank reaches the maximum level, the control system receives the detection signal from the level gauge and closes the solenoid valve;

[0039] When the water level in the node tank gradually decreases and reaches the minimum water level, the control system receives a detection signal from the liquid level meter and opens the solenoid valve to pump water into the node tank.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] By installing a liquid level gauge, its two float switches detect the highest and lowest water levels in the node tank. When the water level drops to the lowest level, the control system opens the solenoid valve and causes the vacuum pump to pump air into the node tank, raising the water level. When the water level rises to the highest level, the control system closes the solenoid valve. This repeated process keeps the water level in the node tank between the lowest and highest levels, eliminating the need for a single liquid level gauge. The solenoid valve opens to pump air into the node tank only after the water level drops slightly, preventing frequent openings of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the overall structure of the vacuum node device for automatic water level control of the present invention.

[0043] Figure 2 This is a perspective view of the node tank body of the vacuum node device for automatic water level control of the present invention.

[0044] Figure 3 A perspective view of a liquid level gauge of a vacuum node device for automatic water level control according to the present invention.

[0045] Figure 4 This is a schematic diagram of the air extraction pipeline of the vacuum node device for automatic water level control of the present invention.

[0046] Figure 5 This is a schematic diagram of a first embodiment of a vacuum node device for automatic water level control according to the present invention.

[0047] Figure 6 This is a schematic diagram of a second embodiment of the vacuum node device for automatic water level control of the present invention.

[0048] Legend: 1. Node tank; 11. Node tank body; 12. Air extraction pipe interface; 13. Water extraction pipe interface; 14. First valve; 15. Water stabilizing plate; 16. Filter; 2. Liquid level gauge; 21. Indicator light; 22. Protective tube; 23. Wiring port; 24. Liquid level gauge protective tube; 25. Junction box; 26. Connecting rod; 27. Magnetic float; 28. Limit plate; 29. ​​Reed switch; 3. Solenoid valve; 4. Air extraction pipeline; 41. Air extraction pipe; 42. Filter; 43. Second valve; 44. Air extraction standby pipe; 45. Vent valve; 46. Third valve; 5. Water extraction pipeline; 6. Water pump. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] See Figure 1 The present invention provides a vacuum node device with automatic water level control and a method of using the device, which solves the problem that the existing vacuum system is difficult to keep the water pump in a constant water-lifting state. By setting a liquid level gauge, the two float switches of the liquid level gauge respectively detect the highest water level and the lowest water level in the node tank. When the water level in the node tank drops to the lowest water level, the control system opens the solenoid valve and causes the vacuum pump unit to evacuate the node tank to raise the water level. When the water level in the node tank rises to the highest water level, the control system closes the solenoid valve. By repeating this process, the water level in the node tank is controlled between the lowest water level and the highest water level, thus avoiding the need to set a single liquid level gauge. After the water level drops slightly, the solenoid valve is opened to evacuate the node tank, thus avoiding the need to open the solenoid valve frequently.

[0051] The following describes a vacuum node device for automatic water level control and its use method in conjunction with the accompanying drawings.

[0052] See Figure 1 , shows the overall structural diagram of the vacuum node device for automatic water level control of the present invention. Figure 2 , showing a perspective view of the node tank body of the vacuum node device for automatic water level control of the present invention. Figure 5 , shows a schematic diagram of an embodiment of a vacuum node device for automatic water level control of the present invention. Figure 1 、 Figure 2 and Figure 5 , a vacuum node device for automatic water level control and a method of use thereof are described in the present invention.

[0053] like Figure 1 、 Figure 2 and Figure 5As shown, a vacuum node device for automatic water level control of the present invention is connected to a water pump 6, which is connected to a water inlet pipe, and the height of the water pump 6 is higher than the height of the water inlet pipe, including:

[0054] Node tank 1, the bottom of which is connected to water pump 6;

[0055] An air extraction pipeline 4, one end of which is connected to the top of the node tank 1, and the other end is connected to the vacuum pump unit. An electromagnetic valve 3 is provided on the air extraction pipeline 4;

[0056] The liquid level meter 2 and the control system, the liquid level meter 2 includes two float switches spaced apart in an upper and lower manner in the node tank 1, the two float switches are connected to the control system, the upper and lower float switches are respectively used to detect whether the water in the node tank 1 has reached the lowest water level and the highest water level, and send the detection signal to the control system. When the control system receives the detection signal that the water level is at the lowest water level, it opens the solenoid valve 3 to allow the vacuum pump unit to pump air into the node tank 1 to raise the water level. When the control system receives the detection signal that the water level reaches the highest water level, it closes the solenoid valve 3 to stop pumping air into the node tank 1. This cycle enables the control system to open or close the solenoid valve to keep the water level in the node tank 1 between the lowest water level and the highest water level.

[0057] Specifically, the height of the node tank 1 is higher than the height of the water pump 6 .

[0058] like Figure 3 As shown, in a specific embodiment, the liquid level meter 2 further includes:

[0059] A connecting rod 26 is vertically arranged in the node tank 1, the upper end of the connecting rod 26 is fixed to the top surface of the node tank 1, and two float switches are spaced apart on the connecting rod 26;

[0060] The liquid level gauge protective tube 24 for protecting the float switch is sleeved on the outside of the connecting rod 26 and the upper end is fixed to the top surface of the node tank 1. A plurality of air holes are evenly opened on the surface of the liquid level gauge protective tube 24 to ensure that water can flow into the liquid level gauge protective tube 24.

[0061] In one embodiment, both float switches include:

[0062] a reed switch 29 embedded in the connecting rod 26, the reed switch 29 being connected to the control system;

[0063] Two limit plates 28 are fixedly mounted on the connecting rod 26. The two limit plates 28 are spaced apart and located above and below the reed switch 29, respectively.

[0064] A magnetic float 27 is slidably mounted on the connecting rod 26 and is located between two limit plates 28. The magnetic float 27 changes the on / off state of the reed switch 29 by changing its up / down position.

[0065] The detection signal received by the control system is the connection signal of the reed switch 29. When the water level in the node tank 1 is located at the magnetic float 27 below, the reed switch 29 below is in a connection state, the control system detects the connection signal and opens the solenoid valve 3. When the water level in the node tank 1 rises to the float switch above, the reed switch 29 above is in a connection state, the control system detects the connection signal and closes the solenoid valve 3.

[0066] In a specific embodiment, the liquid level gauge 2 further includes two display lights 21, which are spaced apart and distributed on the outside of the node tank 1 and connected to the control system.

[0067] When the reed switch 29 below is in a connected state, the control system turns off the display light 21 below, and when it is in a disconnected state, the control system turns on the display light 21;

[0068] When the reed switch 29 above is in a disconnected state, the control system turns off the display light 21 above; when it is in a connected state, the control system turns on the display light 21.

[0069] Specifically, a protective tube 22 is installed within the node tank 1. One end of the protective tube 22 extends from the node tank 1 and is provided with a wiring port 23. Two wires are installed within the protective tube 22, each connected to a corresponding indicator light 21. The other ends of the wires pass through the wiring port 23 and are connected to the control system. A junction box 25 is installed at the top of the node tank 1. Two wires are installed within the connecting rod 23. The two wires are connected to corresponding reed switches 29. The other ends of the two wires extend from the junction box 25 and are connected to the control system.

[0070] In a specific embodiment, the node tank 1 includes:

[0071] Node tank body 11;

[0072] A water pumping pipe interface 13 is connected to the bottom of the node tank body 11. The water pumping pipe interface 13 is provided with a first valve 14 and is connected to one end of the water pumping pipe 5. The other end of the water pumping pipe 5 is connected to the top of the water pump 6 and communicates with the internal chamber.

[0073] The air extraction pipe interface 12 connected to the top of the node tank body 11 is used to connect to the air extraction pipeline 4.

[0074] In a specific embodiment, the node tank 1 further includes:

[0075] A filter 16 is provided in the node tank body 11. The filter 16 blocks the connection between the water pumping pipe interface 13 and the node tank body 11 to filter the water pumped into the node tank body 11.

[0076] The water stabilizing plate 15 is fixed on the inner wall of the node tank body 11 , and a plurality of through holes are evenly opened on the water stabilizing plate 15 for water circulation.

[0077] Specifically, the water stabilizing plate 15 is annular, with its outer side fixed to the inner wall of the node tank body 11 and its inner side fixed to the liquid level gauge protective tube 24. The water stabilizing plate 15 is located in the lower middle portion of the node tank body 11, dividing it into two chambers. When negative pressure develops within the node tank body 11, water enters the lower chamber through the pumping line 5, gradually rising the water level and entering the upper chamber through the through-holes in the water stabilizing plate 15. This prevents the water within the node tank body 11 from churning and affecting the detection accuracy of the liquid level gauge 2. The node tank body 11 comprises a barrel-shaped structure, sealed with an upper cover at the top.

[0078] like Figure 4 As shown, in a specific embodiment, the air extraction pipeline 4 includes:

[0079] An air extraction pipe 41, one end of which is connected to the node tank 1, and the other end of which is connected to the vacuum pump unit. The solenoid valve 3 is provided on the air extraction pipe 41 to control the on-off of the air extraction pipe 41;

[0080] A filter 42 connected to the air extraction pipe 41;

[0081] A second valve 43 is connected to the air extraction pipe 41;

[0082] The two ends of the standby air extraction pipe 44 are connected to the two ends of the air extraction pipe 41 through a three-way pipe. The standby air extraction pipe 44 is provided with a third valve 46 and a vent valve 45.

[0083] Specifically, the vent valve 45 is implemented as follows. When performing maintenance on the node tank 1, the control system is shut down, the second valve 43 and the third valve 46 are manually closed, and the vent valve 45 is opened to connect the air extraction pipe 44 to the outside world. Air then enters the node tank 1 through the vent valve 45 and the air extraction pipe 44, allowing the water in the node tank 1 to be discharged through the water pump 6 and the water inlet pipe. This allows the node tank 1 to be emptied of water, facilitating maintenance of the node tank 1.

[0084] Specifically, it also includes a control box arranged on the outside of the node tank body 11. The outside of the control box is provided with a solenoid valve on-off display light. When the solenoid valve 3 is working, the solenoid valve on-off display light is on. When the solenoid valve 3 stops working, the solenoid valve on-off display light is off.

[0085] Preferably, the vacuum tank body 11, the liquid level gauge 2, the filter screen 16, and the water stabilizing plate 15 are all made of stainless steel SS304, so that they can be applied to working conditions such as the water pump room and water delivery pump room of the water plant, and the lifting pump station between the water source and the water plant.

[0086] Preferably, the vacuum tank body 11, liquid level gauge 2, filter screen 16, and water stabilization plate 15 are all made of SS316L stainless steel, suitable for use in membrane tank treatment processes and preventing corrosion. The solenoid valve 3 is a fast-acting pneumatic ball valve, which prevents corrosion of the valve core by acidic and alkaline gases contained in the water within the membrane tank.

[0087] like Figure 6 As shown, the present invention is preferably applicable to operating conditions without a water pump 6, and the water level at the source is higher than the outlet of the water inlet pipe. The pumping line 5 is directly connected to the highest point of the water inlet pipe, allowing the negative pressure within the node tank 1 to draw the water in the water inlet pipe to the highest point. When the node tank 1 has sufficient water, the solenoid valve 3 is closed, and the water in the water inlet pipe automatically flows out of the outlet. Due to the siphon principle, water continuously enters the water inlet pipe from the inlet end and flows out from the outlet end.

[0088] The present invention also provides a method for using a vacuum node device for automatic water level control, which specifically includes the following steps:

[0089] Providing a vacuum node device as claimed in claim 1;

[0090] Install the node tank 1 above the water pump 6, connect the bottom of the node tank 1 to the water pump 6, and place the water inlet pipe in the water source;

[0091] The automatic control mode of the control system is turned on, so that the control system activates the solenoid valve 3. The vacuum pump unit evacuates air from the node tank 1, thereby generating a negative pressure in the node tank 1. Under the action of the negative pressure, water enters the node tank 1 through the water inlet pipe and the water pump 6.

[0092] The liquid level meter 2 detects whether the water level in the node tank 1 has reached the maximum water level or the minimum water level, and sends the detection signal to the control system;

[0093] When the water level in the node tank 1 reaches the maximum water level, the control system receives the detection signal from the liquid level meter 2 and closes the solenoid valve 3;

[0094] When the water level in the node tank 1 gradually decreases and reaches the lowest water level, the control system receives a detection signal from the liquid level meter 2 and opens the solenoid valve 3 to pump water out of the node tank 1 .

[0095] The following describes in detail the use process and working principle of a vacuum node device for automatic water level control of the present invention.

[0096] After the device is installed, during initial use, the control system is turned on. The magnetic float 27 located below, under the action of gravity, engages with the reed switch 29 below, placing the reed switch 29 in a connected state. Upon receiving the connection signal from the reed switch 29, the control system opens the solenoid valve 3. The vacuum pump unit then evacuates the node tank 1 through the exhaust pipe 4, thereby generating a negative pressure within the node tank 1 and allowing water to enter the node tank 1 through the water inlet pipe, water pump 6, and exhaust pipe 5. The water level within the node tank 1 gradually rises. First, the magnetic float 27 below rises with the water level until it abuts the corresponding limit plate 28. Then, the reed switch 29 below gradually leaves the magnetic field range of the magnetic float 27, switching from a connected state to a disconnected state, causing the control system to turn on the indicator light 21 below. Then the water level continues to rise, causing the magnetic float 27 above to rise along with the water level. After it rises to abut against the corresponding limit plate 28, the reed switch 29 above is switched from the disconnected state to the connected state by the magnetic field of the magnetic float 27. The control system receives the connection signal from the reed switch 29 and closes the solenoid valve 3, thereby stopping the pumping of water into the node tank 1, and turning on the display light 21 above.

[0097] During the operation of water pump 6, the gas in the cavity of water pump 6 will gradually enter node tank 1 through the pumping pipe 5, causing the water level in node tank 1 to gradually drop. First, the upper magnetic float 27 will drop as the water level drops, causing the upper reed switch 29 to switch from the connected state to the disconnected state, thereby causing the control system to turn off the upper display light 21. The water level in node tank 1 continues to drop, causing the lower magnetic float 27 to gradually drop as the water level drops, causing the lower reed switch 29 to switch from the disconnected state to the connected state. The control system receives the connection signal from the reed switch 29 and opens the solenoid valve 3 to pump water from node tank 1 until the water level rises to the highest water level, causing the upper reed switch 29 to be in the connected state, thereby causing the control system to close the solenoid valve 3.

[0098] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A vacuum node device for automatic water level control, connected to a water pump (6), the water pump (6) is connected to a water inlet pipe, and the height of the water pump (6) is higher than the height of the water inlet pipe, characterized in that: include: A node tank (1), the bottom of which is connected to a water pump (6); An air extraction pipeline (4), one end of which is connected to the top of the node tank (1), and the other end of which is connected to the vacuum pump unit, and an electromagnetic valve (3) is provided on the air extraction pipeline (4); A liquid level meter (2) and a control system, wherein the liquid level meter (2) comprises two float switches spaced apart in an upper and lower arrangement in the node tank (1), the two float switches being connected to the control system, the upper and lower float switches being used to detect whether the water in the node tank (1) has reached a minimum water level and a maximum water level, respectively, and sending a detection signal to the control system, and when the control system receives a detection signal indicating that the water level is at the minimum water level, the solenoid valve (3) is opened to allow the vacuum pump unit to pump air into the node tank (1) to raise the water level, and when the control system receives a detection signal indicating that the water level has reached a maximum water level, the solenoid valve (3) is closed to stop pumping air into the node tank (1), and this cycle causes the control system to open or close the solenoid valve to maintain the water level in the node tank (1) between the minimum water level and the maximum water level.

2. A vacuum node device for automatic water level control according to claim 1, characterized in that: The liquid level gauge (2) further comprises: A connecting rod (26) is vertically arranged in the node tank (1), the upper end of the connecting rod (26) is fixed to the top surface of the node tank (1), and two float switches are arranged on the connecting rod (26) at intervals above and below; A liquid level gauge protective tube (24) for protecting the float switch is sleeved on the outside of the connecting rod (26) and the upper end is fixed to the top surface of the node tank (1). A plurality of air holes are evenly opened on the surface of the liquid level gauge protective tube (24) to ensure that water can flow into the liquid level gauge protective tube (24).

3. The vacuum node device for automatic water level control according to claim 2, characterized in that: Both float switches include: a reed switch (29) embedded in the connecting rod (26), the reed switch (29) being connected to the control system; Two limit plates (28) are fixedly sleeved on the connecting rod (26), and the two limit plates (28) are spaced apart and respectively located above and below the reed switch (29); A magnetic float (27) is slidably mounted on the connecting rod (26) and is located between two limit plates (28). The magnetic float (27) changes the on / off state of the reed switch (29) by changing its up / down position. The detection signal received by the control system is a connection signal of the reed switch (29). When the water level in the node tank (1) is located at the magnetic float (27) below, the reed switch (29) below is in a connection state, the control system detects the connection signal and opens the solenoid valve (3). When the water level in the node tank (1) rises to the float switch above, the reed switch (29) above is in a connection state, the control system detects the connection signal and closes the solenoid valve (3).

4. The vacuum node device for automatic water level control according to claim 3, characterized in that: The liquid level meter (2) further comprises two display lights (21), the two display lights (21) being distributed on the outside of the node tank (1) at intervals in the upper and lower parts and connected to the control system; When the reed switch (29) below is in a connected state, the control system turns off the display light (21) below, and when it is in a disconnected state, the control system turns on the display light (21); When the upper reed switch (29) is in a disconnected state, the control system turns off the upper display light (21); when it is in a connected state, the control system turns on the display light (21).

5. The vacuum node device for automatic water level control according to claim 1, characterized in that: The node tank (1) comprises: Node tank body (11); A water pumping pipe interface (13) connected to the bottom of the node tank body (11), the water pumping pipe interface (13) is provided with a first valve (14) and is connected to one end of a water pumping pipeline (5), the other end of the water pumping pipeline (5) is connected to the top end of the water pump (6) and communicates with the internal chamber; An air extraction pipe interface (12) connected to the top of the node tank body (11) is used to be connected to the air extraction pipeline (4).

6. The vacuum node device for automatic water level control according to claim 5, characterized in that: The node tank (1) further comprises: a filter screen (16) provided in the node tank body (11), the filter screen (16) blocking the communicating end between the water pumping pipe interface (13) and the node tank body (11) to filter the water pumped into the node tank body (11); A water stabilizing plate (15) is fixed on the inner wall of the node tank body (11), and a plurality of through holes are evenly opened on the water stabilizing plate (15) for water circulation.

7. The vacuum node device for automatic water level control according to claim 1, characterized in that: The air extraction pipeline (4) comprises: An air extraction pipe (41) has one end connected to the node tank (1) and the other end connected to the vacuum pump unit. The solenoid valve (3) is provided on the air extraction pipe (41) to control the on / off of the air extraction pipe (41); A filter (42) connected to the air extraction pipe (41); a second valve (43) connected to the air extraction pipe (41); The two ends of the standby air extraction pipe (44) are connected to the two ends of the air extraction pipe (41) through a three-way pipe. The standby air extraction pipe (44) is provided with a third valve (46) and a vent valve (45).

8. A method for using a vacuum node device for automatic water level control, characterized in that: The specific steps include: Providing a vacuum node device as claimed in claim 1; Install the node tank (1) above the water pump (6), connect the bottom of the node tank (1) to the water pump (6), and place the water inlet pipe in the water source; The automatic control mode of the control system is turned on, so that the control system starts the solenoid valve (3), and the vacuum pump unit evacuates air from the node tank (1) to generate negative pressure in the node tank (1). Under the action of the negative pressure, water enters the node tank (1) through the water inlet pipe and the water pump (6); The liquid level meter (2) detects whether the water level in the node tank (1) reaches the maximum water level or the minimum water level, and sends a detection signal to the control system; When the water level in the node tank (1) reaches the maximum water level, the control system receives a detection signal from the liquid level meter (2) and closes the solenoid valve (3); When the water level in the node tank (1) gradually decreases and reaches the lowest water level, the control system receives a detection signal from the liquid level meter (2) and opens the solenoid valve (3) to pump water out of the node tank (1).

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