Liquid level controller and liquid level control system

Abstract

The present invention relates to the field of valve technology, and in particular to a liquid level controller and a liquid level control system thereof. The liquid level controller comprises a valve body assembly, a valve flap, a valve core, a floating assembly and a differential sealing assembly, wherein the valve flap and the valve core are arranged in the valve body assembly, the valve flap is connected to the valve core and a chamber is formed between the valve flap and the valve body assembly, a first outlet is provided on the valve body assembly, a channel is provided on the valve core, one end of the differential sealing assembly is used to cooperate with the valve core, and the other end is used to cooperate with the floating assembly; when the floating assembly is floated by force, the floating assembly pushes the differential sealing assembly to seal the channel, so that the valve flap moves to close the liquid level controller, and when the floating assembly falls, the differential sealing assembly is separated from the channel, the chamber is connected to the first outlet through the channel, and the valve flap moves to open the liquid level controller.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, in particular to a liquid level controller and a liquid level control system thereof. Background Art

[0002] The liquid level controller is installed in the liquid storage device to control the height of the liquid level in the liquid storage device. According to different control methods, the liquid level controller can be divided into electronic liquid level switch control, float switch control, that is, float valve, liquid level relay control, non-contact control, etc. The liquid level controller mainly controls the opening and closing of the valve to replenish the liquid storage device to achieve the control of the liquid level.

[0003] The float switch control is generally a float valve, which mainly includes a valve body assembly, a connecting rod assembly, a float and other components. The float is placed in the liquid storage device, and the connecting rod assembly is connected to the float. The buoyancy of the fluid medium in the liquid storage device drives the float to float, so as to realize the opening / closing of the float valve and achieve the purpose of controlling the liquid level of the fluid medium in the liquid storage device.

[0004] At present, the existing float valve mainly relies on the buoyancy of the float to provide sealing force during the sealing process. Since the buoyancy that the float can provide is limited, the only way to increase the sealing force is to increase the volume of the float and adopt a longer connecting rod structure, which has a relatively complex structure. Secondly, the opening / closing of the valve is controlled by a float and connecting rod assembly. As long as the fluid medium in the liquid storage device is slightly lost or used, the float valve will open, which causes the float valve to open / close frequently, seriously affecting the float switch control and the service life of the valve. Summary of the invention

[0005] Based on this, it is necessary to provide a liquid level controller and a liquid level control system with a simple structure and a long service life in order to solve the above technical problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A liquid level controller is installed in a liquid storage device to control the liquid level of a fluid medium in the liquid storage device. The liquid level controller comprises a valve body assembly, a valve flap, a valve core, a floating assembly and a differential seal assembly. The valve flap and the valve core are both arranged in the valve body assembly. The valve flap is connected to the valve core, and a chamber is formed between the valve flap and the valve body assembly. The valve body assembly is provided with a first outlet for the fluid medium to flow out. The valve flap is provided with a through hole. The valve core is provided with a channel, and the through hole is connected with the channel. One end of the differential seal assembly is used to cooperate with the valve core, and the other end is used to cooperate with the floating assembly.

[0008] When the floating assembly is forced to float up, the floating assembly pushes the differential sealing assembly to seal the channel, thereby linking the valve flap to move to close the liquid level controller;

[0009] When the floating assembly falls, the differential sealing assembly is separated from the passage, the chamber is communicated with the first outlet through the passage, and the valve flap moves to open the liquid level controller.

[0010] In the present application, a differential seal assembly is provided so that the floating assembly acts on the differential seal assembly to control the movement of the valve disc to realize the opening and closing of the liquid level controller. It can be seen that the liquid level controller eliminates the connecting rod assembly and controls the movement of the valve disc through the differential seal assembly, so the sealing is simple and reliable. At the same time, the liquid level controller opens at a low liquid level and closes at a high liquid level, so the liquid level control is convenient and the structure is simple. Secondly, the high and low liquid level control avoids the frequent opening / closing of the liquid level controller and prolongs the service life of the liquid level controller.

[0011] In one embodiment, the differential sealing assembly includes a sealing member, an installation cavity is opened on the valve body assembly, the first outlet is communicated with the installation cavity, the sealing member is accommodated in the installation cavity, one end of the valve core is installed in the installation cavity and cooperates with the sealing member, the other end of the valve core extends into the through hole, a gap is formed between the outer wall of the valve core and the inner wall of the through hole, and the size of the gap is adjustable.

[0012] In one embodiment, the valve body assembly is further provided with a first inlet and a second outlet, the chamber is located between the first inlet and the second outlet, the valve flap has an outer side facing the first inlet and an inner side facing the chamber, and the surface area of ​​the inner side of the valve flap is greater than the surface area of ​​the outer side of the valve flap.

[0013] In one embodiment, the liquid level controller also includes an air supply valve flap, and an air supply cavity and an air supply hole are provided on the valve body assembly. The air supply cavity is connected to the first inlet, and the air supply valve flap is arranged in the air supply cavity to achieve connection or isolation between the air supply hole and the first inlet.

[0014] It can be understood that by setting the air supply valve flap, the connection or isolation between the air supply hole and the first inlet can be controlled to balance the pressure between the first inlet and the second outlet, thereby preventing the fluid medium in the second outlet from flowing back to the first inlet and causing contamination of the fluid medium at the first inlet.

[0015] In one embodiment, the valve body assembly includes a valve body, a valve cover and a valve seat, the valve body is installed on the valve seat, the valve cover is covered on the valve seat, the first inlet and the second outlet are both opened on the valve body, and the first outlet and the installation cavity are both opened on the valve seat.

[0016] In one embodiment, a filter device is provided at the first inlet, and the filter device is used to filter the fluid medium entering from the first inlet.

[0017] The filter device is provided to filter the fluid medium at the first inlet; secondly, the provision of the filter device enables the liquid level controller to be used alone as a control valve, which has a wide range of application prospects.

[0018] In one embodiment, the floating assembly includes a buoy and a solid structure, wherein the solid structure fills the interior of the buoy, and the density of the solid structure is less than the density of the fluid medium.

[0019] A solid structure is used to replace the existing float, and the solid structure fills the float, which can avoid the situation that the fluid medium enters the float, the float breaks or falls off, resulting in insufficient buoyancy or loss of buoyancy, inability to control the liquid level, and overflow of the fluid medium.

[0020] In one embodiment, the liquid level controller also includes a control box and a control tube, the floating assembly is arranged in the control box, the valve body assembly is arranged on the control box, and a control hole is opened on the control box to allow the fluid medium in the liquid storage device to flow into the control box. The control tube has a relatively high point and a low point, the high point of the control tube is arranged close to the control hole, and the low point of the control tube is arranged away from the control hole. One end of the control tube is connected to the interior of the control box, and the other end extends into a predetermined position in the liquid storage device.

[0021] When the liquid level in the liquid storage device rises to a certain height, the fluid medium enters the control box from the highest point of the control tube or the control hole. At this time, a section of air will be sealed in the control tube. At the same time, the floating component is affected by the buoyancy, and the differential sealing component drives the valve disc to move, so that the liquid level controller is closed; when the liquid level in the liquid storage device drops to a predetermined position, the air pressure in the control tube will decrease, thereby generating a siphon phenomenon, so that the fluid medium in the control box flows into the liquid storage device through the control tube, and then the buoyancy of the floating component disappears, and the differential sealing component drives the valve disc to move, so that the liquid level controller is opened. It can be seen from the above process that by setting the control tube, the high and low liquid levels of the liquid storage device can be accurately controlled, avoiding frequent opening / closing of the liquid level controller and the valve, and the low liquid level of the liquid storage device can be adjusted and controlled according to the different heights of the liquid storage device.

[0022] In one embodiment, one end of the control tube is a liquid inlet, and the other end is a liquid outlet, the liquid inlet extends into the liquid storage device and is close to the bottom of the liquid storage device, the liquid outlet is connected to the control box, and the position of the liquid inlet is between the highest point G and the lowest point L.

[0023] The present invention also provides the following technical solutions:

[0024] A liquid level control system is used to control the liquid level in a liquid storage device, comprising a main valve component and a liquid level controller, wherein the liquid level controller is used to control the opening and closing of the valve component.

[0025] Compared with the prior art, the liquid level controller and its liquid level control system are provided with a differential seal assembly, so that the floating assembly controls the movement of the valve disc by acting on the differential seal assembly to realize the opening and closing of the liquid level controller. It can be seen that the liquid level controller cancels the connecting rod assembly and controls the movement of the valve disc through the differential seal assembly, so the sealing is simple and reliable. At the same time, the liquid level controller is opened at a low liquid level and closed at a high liquid level, so the liquid level control is convenient and the structure is simple; secondly, the high and low liquid level control is adopted to avoid the frequent opening / closing of the liquid level controller and prolong the service life of the liquid level controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A control flow chart of the liquid level control system provided by the present invention;

[0027] Figure 2 A schematic diagram of the structure of the liquid level control system provided by the present invention;

[0028] Figure 3 A schematic diagram of the structure of the main valve assembly provided by the present invention;

[0029] Figure 4 A schematic diagram of the structure of the liquid level controller provided by the present invention;

[0030] Figure 5 The present invention provides Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 The present invention provides Figure 5 Enlarged view of point B in the middle;

[0032] Figure 7 This is a schematic diagram of the structure of the control tube provided by the present invention.

[0033] In the figure, a liquid level control system 100, a liquid storage device 101, a connecting pipe 102, a main valve assembly 10, a main valve body 11, a main inlet 111, a main outlet 112, a main valve disc 12, a pilot hole 121, a main valve seat 13, a main elastic member 14, a main chamber 15, a liquid level controller 20, a valve body assembly 21, a valve body 211, a first inlet 211a, a second outlet 211b, a chamber 211c, an air supply chamber 211d, a valve cover 212, an air supply hole 212a, a valve seat 213, a first outlet 213a, an installation step 213b, an installation chamber 213c, a convex portion 2131, a valve disc 22, an outer side 221 of the valve disc, and a valve The inner side 222 of the flap, the through hole 223, the guide block 224, the valve core 23, the first end 231 of the valve core, the second end 232 of the valve core, the step 233, the channel 234, the first channel 234a, the second channel 234b, the elastic member 235, the differential seal assembly 30, the seal 31, the floating assembly 40, the float 41, the solid structure 42, the control box 50, the control hole 51, the control tube 60, the liquid inlet 61, the liquid outlet 62, the first bend 63, the second bend 64, the anti-backflow device 70, the air replenishment valve flap 71, the floating part 711, the floating groove 711a, the air replenishment seal 712, and the filter device 80. DETAILED DESCRIPTION

[0034] 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.

[0035] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0037] See also Figure 1 and Figure 2The present invention provides a liquid level control system 100 for controlling the liquid level of a fluid medium in a liquid storage device 101, and realizing the function of automatically replenishing the fluid medium of the liquid storage device 101. Here, the liquid storage device 101 can be a pool, a water tank, an oil tank, etc., and the fluid medium can be a liquid such as water or oil.

[0038] The liquid level control system 100 includes a main valve assembly 10 and a liquid level controller 20. The main valve assembly 10 is connected to the pipeline assembly. The liquid level controller 20 is arranged in the liquid storage device 101 and connected to the main valve assembly 10 to control the opening and closing of the valve assembly 10. In this embodiment, the main valve assembly 10 is a common valve assembly. For example, the main valve assembly 10 can be an axial flow water control valve, a diaphragm water control valve, etc. Of course, the liquid level controller 20 can also be used alone, that is, the liquid level controller 20 is connected to the pipeline assembly, and the liquid level of the liquid storage device 101 is controlled by the opening / closing of the liquid level controller 20 itself. Here, it needs to be explained that the liquid level of the fluid medium in the liquid storage device 101 refers to the height of the position of the fluid medium in the liquid storage device 101.

[0039] In this embodiment, the liquid level controller 20 is used to control the opening or closing of the main valve assembly 10, and the structure and control principle of the liquid level controller 20 are specifically described. In this embodiment, the main valve assembly 10 is an axial flow water control valve, and the liquid level controller 20 is connected to the main valve assembly 10 through a connecting pipe 102.

[0040] See also Figure 3 The main valve assembly 10 includes a main valve body 11, a main valve disc 12, a main valve seat 13 and a main elastic member 14. The main valve disc 12 is installed in the main valve body 11, and a main chamber 15 is formed between the main valve disc 12 and the main valve body 11. The main valve seat 13 is installed on the main valve body 11. One end of the connecting pipe 102 is connected to the main valve body 11 and communicates with the main chamber 15. A pilot hole is provided on the main valve disc 12. One end of the main valve needle 14 is installed in the pilot hole, and there is a gap between the outer wall of the main valve needle 14 and the inner wall of the pilot hole. The main elastic member 14 is located in the main chamber 15. One end of the main elastic member 14 abuts against the main valve disc 12, and the other end abuts against the inner wall of the main chamber 15.

[0041] Furthermore, the main valve body 11 is provided with a main inlet 111 for fluid medium to flow in and a main outlet 112 for fluid to flow out and connected to the liquid storage device 101. The main valve flap 12 is provided with a pilot hole 121, and the main inlet 111 is connected to the main chamber 15 through the pilot hole 121. The liquid level controller 20 controls the liquid level of the fluid medium in the liquid storage device 101 by connecting and isolating the main inlet 111 and the main outlet 112.

[0042] See also Figure 4 , Figure 5 and Figure 6 The liquid level controller 20 includes a valve body assembly 21, a valve flap 22, a valve core 23, a differential seal assembly 30, a floating assembly 40, a control box 50 and a control pipe 60. The valve flap 22 and the valve core 23 are arranged in the valve body assembly 21, a through hole 223 is opened on the valve flap 22, one end of the valve core 23 is installed in the through hole 223, the floating assembly 40 is arranged in the control box 50, and the differential seal assembly 30 is arranged between the control box 50 and the valve body assembly 21. One end of the differential seal assembly 30 cooperates with the valve core 23, and the other end cooperates with the floating assembly 40, so that the differential seal assembly 30 is driven to move through the floating assembly 40, so that the valve flap 22 moves to realize the opening and closing of the liquid level controller 20.

[0043] The valve body assembly 21 includes a valve body 211, a valve cover 212 and a valve seat 213. The valve body 211 is installed on the valve seat 213 by threaded connection, welding connection, etc., and the valve cover 212 is covered on the valve seat 213. Preferably, in this embodiment, the valve body 211 and the valve seat 213 are connected by threads.

[0044] The valve body 211 is provided with a first inlet 211a for fluid medium to enter and a second outlet 211b for fluid medium to flow out. The valve flap 22 is arranged in the valve body 211. The valve flap 22, the valve body 211 and the valve seat 213 form a chamber 211c. The first inlet 211a is used to connect with an external pipeline component to guide the fluid medium to enter the valve body 211. The second outlet 211b is connected to the liquid storage device 101 so that the fluid medium flowing out of the second outlet 211b can flow into the liquid storage device 101. In this embodiment, the movement of the valve flap 22 is controlled to control the connection or isolation between the first inlet 211a and the second outlet 211b to realize the opening and closing of the liquid level controller 20.

[0045] Furthermore, a quick-connect socket is provided at the first inlet 211a, and the quick-connect socket is used to cooperate with an external pipeline to achieve a quick connection of the external pipeline.

[0046] The valve seat 213 is provided with a mounting step 213b, and the valve body 211 is mounted on the mounting step 213b. Further, the valve seat 213 is provided with a mounting cavity 213c and a first outlet 213a for the fluid medium to flow out, the chamber 211c is located between the first outlet 213a and the second outlet 211b, one end of the first outlet 213a is connected to the liquid storage device 101, and the other end is connected to the mounting cavity 213c, the valve core 23 is installed in the mounting cavity 213c and connected to the valve disc 22, and the differential seal assembly 30 is installed in the mounting cavity 213c to cooperate with the valve core 23. Further, the valve seat 213 is provided with a convex portion 2131, and the mounting cavity 213c is opened on the convex portion 2131.

[0047] The valve flap 22 is generally in a "bowl" shape, and is disposed between the valve body 211 and the valve seat 213, with the opening of the valve flap 22 disposed toward the valve seat 213. Further, the valve flap 22 has an outer side 221 facing the first inlet 211a and an inner side 222 facing the chamber 211c, and the surface area of ​​the inner side 222 of the valve flap is greater than the surface area of ​​the outer side 221 of the valve flap 22.

[0048] The through hole 223 connects the chamber 211c with the first inlet 211a. One end of the valve core 23 extends into the through hole 223, and a gap is formed between the outer wall of the valve core 23 and the inner wall of the through hole 223, and the size of the gap is adjustable. It can be understood that the gap is a throttling channel, and the gap can adjust the pressure of the fluid medium entering the chamber 211c from the first inlet 211a. The size of the gap is adjustable, that is, it can adjust different pressure fluid media to enter the chamber 211c, so that the liquid level controller 20 can adapt to different pressure system environments; at the same time, when the system pressure value changes, by adjusting the gap, it can avoid the changing pressure from causing damage to the components in the system, such as the valve disc 22, the valve core 23, etc. Preferably, the liquid level control 20 in the present invention can adapt to the pressure system environment of 1MP and above.

[0049] Further, the valve flap 22 is provided with a guide block 224, the through hole 223 is opened on the guide block 224, and the valve core 23 is penetrated in the through hole 223. Here, the valve core 23 also serves as a guide member to guide the movement of the valve flap 22, so that the movement of the valve flap 22 is smoother and more stable. The valve core 23 is roughly rod-shaped, and the cross section of the valve core 23 is "T"-shaped. The valve core 23 has a first end 231 and a second end 232 that are arranged opposite to each other. The first end 231 of the valve core is installed in the installation cavity 213c and is sealed and connected with the installation cavity 213c. The second end 23 of the valve core is penetrated in the through hole 223 and extends into the first inlet 211a. The gap is formed between the outer wall of the second end 23 of the valve core and the inner wall of the through hole 223. It can be understood that the change of the gap can be achieved by changing the outer diameter of the second end 23 of the valve core, that is, by replacing the valve core 23 of different sizes.

[0050] Preferably, the valve core 23 has a step 233 , and when the valve core 23 is installed in the installation cavity 213 c , the step 233 abuts against the convex portion 2131 , thereby achieving the installation and positioning of the valve core 23 .

[0051] The valve core 23 is provided with a channel 234, which is connected to the chamber 211c to allow the fluid medium in the chamber 211c to flow out. Furthermore, the inner diameter of the channel 234 is adjustable. It can be understood that the channel 234 can also be used as a throttling channel. The channel 234 can adjust the pressure of the fluid medium after flowing out of the chamber 211c, and the inner diameter of the channel 234 is adjustable, that is, it can adjust different pressures of the fluid medium flowing out of the chamber 211c, so as to cooperate with the gap between the outer wall of the valve core 23 and the inner wall of the through hole 223, and further improve the ability of the liquid level controller 20 to adapt to different pressure systems; at the same time, when the system pressure value changes, through the adjustment of the gap and the channel 234, it can further avoid the damage of the components in the system caused by the changing pressure, that is, extend the service life of the liquid level controller 20.

[0052] Specifically, the channel 234 includes a first channel 234a and a second channel 234b, and the inner diameters of the first channel 234a and the second channel 234b are adjustable. Of course, in other embodiments, the inner diameter of one of the first channel 234a and the second channel 234b can be adjustable. The first channel 234a is connected to the valve chamber 211c, one end of the second channel 234b is connected to the first channel 234a, and the other end is used to cooperate with the differential seal assembly 30. Preferably, the axis of the first channel 234a is perpendicular to the axis of the second channel 234b. Of course, in other embodiments, the axis of the first channel 234a and the axis of the second channel 234b may not be perpendicular.

[0053] An elastic member 235 is sleeved on the valve core 23 . One end of the elastic member 24 abuts against the protrusion 2131 , and the other end abuts against the valve flap 22 . The elastic member 235 is used to reset the valve flap 22 .

[0054] The differential seal assembly 30 includes a seal 31, which is installed in the installation cavity 213c. Preferably, the cross section of the seal 31 is roughly "T"-shaped, one end of the seal 31 extends out of the installation cavity 213c and cooperates with the floating assembly 40, and the other end of the seal 31 is used to cooperate with the channel 234 to seal the channel 234 or make the channel 234 conductive, thereby realizing the isolation or communication between the first outlet 213a and the chamber 211c. It can be understood that in this embodiment, the seal 31 only partially extends out of the installation cavity 213c, and the seal 31 moves in the installation cavity 213c. The installation cavity 213 has a certain guiding effect on the seal 31, so that the cooperation between the seal 31 and the channel 234 can be ensured to be more tight and accurate, and the misalignment between the seal 31 and the valve core 20 caused by the shaking of the floating assembly 40 due to the liquid level fluctuation can be avoided. The floating assembly 40 includes a buoy 41 and a solid structure 42. The solid structure 42 fills the inside of the buoy 41. The density of the solid structure 42 is less than the density of the fluid medium, so that the buoy 41 can float on the liquid level under the action of the fluid medium. Here, by filling the solid structure 42 in the buoy 41, it is avoided that the fluid medium enters the buoy 41, the buoy 41 breaks or falls off, resulting in insufficient buoyancy or loss of buoyancy, and the inability to control the liquid level, causing the fluid medium of the liquid storage device 101 to overflow.

[0055] Further, the float 41 is roughly cylindrical, and the float 41 is arranged in the control box 50, and one end of the float 41 cooperates with the sealing member 31. When the float 41 is floated up by force, the float 41 pushes the sealing member 31 to seal the channel 234 under the action of buoyancy, so that the valve flap 22 moves to close the liquid level controller 20. When the float 41 falls, the sealing member 41 is separated from the channel 234, and the chamber 211c is connected with the first outlet 213a through the channel 234, and the valve flap 22 moves to open the liquid level controller 20. The solid structure 42 can be a polymer material such as polystyrene foam.

[0056] The control box 50 is generally cylindrical, and has two opposite ends. The first end of the control box 50 is mounted on the valve seat 213 through a detachable structure, and the second end is disposed near the bottom of the liquid storage device 101, and the control tube 60 is connected to the second end of the control box 50. Here, the detachable structure includes a bolt structure, a clamping structure, etc. In this embodiment, the control box 50 is mounted on the valve seat 213 through a bolt structure.

[0057] Furthermore, one end of the control box 50 close to the valve seat 213 is provided with a control hole 51 for allowing the fluid medium in the liquid storage device 101 to flow into the control box 50, so that when the liquid level of the fluid medium in the liquid storage device 101 rises to the control hole 51, the fluid medium flows into the control box 50, so that the float 41 floats under the action of buoyancy to push the seal 31 to seal the channel 234, so that the liquid level controller 20 is closed, thereby closing the main valve assembly 10 to stop injecting liquid into the liquid storage device 101.

[0058] In this embodiment, the position of the control hole 51 can be set according to the actual liquid level of the fluid medium in the liquid storage device 101 to be controlled. It can be understood that when the fluid medium in the liquid storage device 101 enters the control hole 50 from the control hole 51, the main valve assembly 10 is closed and stops injecting liquid into the liquid storage device 101. At this time, the liquid level of the fluid medium in the liquid storage device 101 is the highest level. Therefore, by setting the control box 50 and the floating assembly 40, the liquid level of the fluid medium in the liquid storage device 101 can be flexibly controlled according to different working conditions.

[0059] The control tube 60 is a round tube or a special-shaped tube, and has a relatively set highest point G and lowest point L. The highest point G of the control tube 60 is set close to the control hole 51, and the lowest point L of the control tube 60 is set away from the control hole 51. One end of the control tube 60 is connected to the interior of the control box 50, and the other end extends into a predetermined position in the liquid storage device 101.

[0060] Here, it is necessary to explain that the predetermined position in the liquid storage device 101 is the position of the preset minimum liquid level in the liquid storage device 101. At this position, the float 41 falls, the chamber 211c is connected with the first outlet 213a through the channel 234, and the valve flap 22 moves to open the liquid level controller 20, thereby controlling the main valve assembly 10 to open, and then replenishing the fluid medium into the liquid storage device 101.

[0061] The highest point G of the control tube 60 may be higher or lower than the position of the control hole 51. In this embodiment, the highest point G of the control tube 60 is higher than the position of the control hole 51.

[0062] When the liquid level in the liquid storage device 101 rises to a certain height, the fluid medium enters the control box 50 from the highest point G of the control tube 60 or the control hole 51. At this time, a section of air will be sealed in the control tube 60. At the same time, the seal 31 of the float 41 is acted upon by the buoyancy to seal the channel 234, so that the valve flap 22 moves, and the liquid level controller 20 is closed; when the liquid level in the liquid storage device 101 drops to a predetermined position, the volume in the control tube 60 increases, so that the air pressure in the control tube 60 will decrease, thereby generating a siphon phenomenon, so that the fluid medium in the control box 50 flows into the liquid storage device 101 through the control tube 60, and then the buoyancy of the float 41 disappears, and the seal 31 is separated from the channel 234, so that the valve flap 22 moves, and the liquid level controller 20 is opened. In the present embodiment, the high and low liquid levels of the liquid storage device 101 can be precisely controlled by setting the control tube 60, thereby avoiding frequent opening / closing of the liquid level controller 20 and the main valve assembly 10, extending the service life of the liquid level controller 20 and the main valve assembly 10 by at least 10 times, and the low liquid level of the liquid storage device 101 can be adjusted and controlled according to the different heights of the liquid storage device 101; secondly, it avoids frequent opening / closing of the liquid level controller 20 and the main valve assembly 10, thereby reducing the fluctuation of the medium pressure of the fluid medium in the pipeline, which not only reduces the noise, but also the fluid medium in the liquid storage device 101 is always at a high liquid level, and a dead water area is easily formed at the bottom of the liquid storage device 101, causing secondary pollution of the fluid medium in the liquid storage device 101, and the setting is very reasonable.

[0063] Here, the siphon phenomenon refers to a phenomenon of utilizing the force of the liquid level difference, so that the fluid medium in the control box 50 flows into the liquid storage device 101 through the control pipe 60 .

[0064] In this embodiment, since the area of ​​the fluid medium flowing through the control tube 60 is certain, by changing the position of the highest point G of the control tube 60, the amount of air that can be sealed in the control tube 60 can be changed, thereby changing the air pressure in the control tube 60, so that the height of the siphon generated by the control tube 60 is different, thereby adjusting the liquid level in the liquid storage device 101.

[0065] See also Figure 7 One end of the control tube 60 is a liquid inlet 61, and the other end is a liquid outlet 62. The liquid inlet 61 extends into the liquid storage device 101 and is close to the bottom of the liquid storage device 101. The liquid outlet 62 is connected to the control box 50. The fluid medium of the liquid storage device 101 enters the control box 50 through the liquid inlet 61.

[0066] Further, the control tube 60 can be a round tube or other special-shaped tube, and the control tube 60 includes a first curved portion 63 and a second curved portion 64, and the curvature direction of the first curved portion 63 is opposite to the curvature direction of the second curved portion 64. Specifically, the first curved portion 63 is substantially "U"-shaped, and the second curved portion 64 is also substantially "U"-shaped, and the direction of the "U"-shaped opening of the first curved portion 63 is opposite to the direction of the "U"-shaped opening of the second curved portion 64.

[0067] Preferably, the bending direction of the first curved portion 63 is toward the bottom of the liquid storage device 101, and the bending direction of the second curved portion 64 is away from the bottom of the liquid storage device 101. The bending position of the first curved portion 63 is the highest point G, and the bending position of the second curved portion 64 is the lowest point L. The highest point G is higher than the position of the liquid outlet 62.

[0068] It is understandable that when the fluid medium in the control box 50 rises to the liquid outlet 62 of the control tube 60, that is, the fluid medium enters from the liquid inlet 61 and rises to the height of the liquid outlet 62, the fluid medium enters the control tube 60 through the liquid outlet 62, and at this time, due to the position height difference between the highest point G and the liquid outlet 62, a section of air will be sealed in the control tube 60; when the liquid level of the fluid medium in the liquid storage device 101 drops, the air sealed in the control tube 60 will slowly be thinned (the liquid level in the control tube also drops accordingly, and the space increases), thereby generating a siphon phenomenon, so that the fluid medium in the control box 50 flows into the liquid storage device 101 through the control tube 60, and then the float 41 falls.

[0069] Of course, in other embodiments, the control tube 60 may also be any structure as long as the following purpose can be achieved, that is, when the liquid level in the liquid storage device 101 drops, the fluid medium in the control box 50 can be automatically sucked back into the liquid storage device 101.

[0070] The liquid level controller 20 also includes an anti-backflow device 70 and a filtering device 80. The anti-backflow device 70 is arranged between the valve body 211 and the valve cover 212 to prevent the fluid medium in the second outlet 211b from flowing back to the first inlet 211a, causing contamination of the fluid medium out of the first inlet 211a; the filtering device 80 is arranged at the first inlet 211a to filter the fluid medium flowing through the first inlet 211a.

[0071] Please continue reading Figure 5 The valve body 211 is also provided with an air-injection cavity 211d, and the air-injection cavity 211d is connected to the first inlet 211a. The valve cover 212 is provided at the air-injection cavity 211d, and the valve cover 212 is provided with an air-injection hole 212a, and the air-injection hole 212a is connected to the external atmospheric pressure. The back suction device 70 includes an air-injection valve flap 71, and the air-injection valve flap 71 is installed in the air-injection cavity 211d, and is used to cooperate with the air-injection hole 212a to achieve the connection or isolation between the air-injection hole 212a and the first inlet 211a. When the fluid medium flows in from the first inlet 211a and flows out from the second outlet 211, the air-inflating valve flap 71 moves and seals the air-inflating hole 212a under the action of the buoyancy of the fluid medium; when the fluid medium level in the liquid storage device 101 exceeds the second outlet 211, causing negative pressure in the first inlet 211a or no fluid medium in the first inlet 211a, the buoyancy of the fluid medium at the first inlet 211a disappears, so that the air-inflating valve flap 71 falls, so that the first inlet 211a is connected to the external atmospheric pressure, thereby preventing the fluid medium at the second outlet 211 from flowing back to the first inlet 211a to cause pollution.

[0072] Furthermore, the air-replenishing valve flap 71 includes a floating portion 711 and an air-replenishing seal 712. The air-replenishing seal 712 is installed on the floating portion 711. A floating groove 711a is provided on the floating portion 711 to increase the force-bearing area of ​​the floating portion 711, thereby increasing the sealing force of sealing the air-replenishing hole 212a and making the sealing more reliable.

[0073] The filter device 80 includes a filter screen or a filter, and the filter screen is made of stainless steel. Here, the setting of the filter device 80 enables the liquid level controller 20 to be used as a control valve alone, which has a wide range of application prospects.

[0074] The working principle of the liquid level controller 20 is described below:

[0075] (1) Initial state: the main valve assembly 10 is in a closed position under the action of the main spring; the float 41 falls into the control box 50 due to its own gravity, the valve chamber 211c is connected to the first outlet through the channel 234, and the liquid level controller 20 is in an open state.

[0076] (2) The opening process of the main valve assembly 10: When the fluid medium enters for the first time, the fluid medium in the pipeline enters the main chamber 15 from the main valve port 111 through the pilot hole 121, and flows through the connecting pipe 102 to the liquid level controller 20. Due to the initial state, the liquid level controller 20 is in an open state, so the fluid medium enters from the first inlet 211a and flows out from the second outlet 211b to the liquid storage device 101; at the same time, part of the fluid medium flows out to the liquid storage device 101 through the through hole 223, the chamber 211c, the channel 234 and the first outlet 213a; at this time, there is no fluid medium pressure in the main chamber 15, and under the action of the pressure of the fluid medium itself, the main valve disc 12 moves, the main valve assembly 10 is opened, and the fluid medium flows into the liquid storage device 101 from the main outlet 112.

[0077] (3) Closing process of the main valve assembly 10: When the liquid level in the liquid storage device 101 rises to the highest liquid level, the fluid medium in the liquid storage device 101 enters the control box 50 through the control hole 51 or the control tube 60 on the control box 50; at this time, the float 41 is driven by the buoyancy of the fluid medium to drive the sealing member 31 to seal the channel 234. As the fluid medium is continuously filled into the chamber 211c, the pressure in the chamber 211c increases continuously and the surface area of ​​the inner side 222 of the valve flap is greater than the surface area of ​​the outer side 221 of the valve flap 22. When the pressure of the fluid medium in the chamber 211c reaches a certain level, the pressure of the fluid medium in the chamber 211c pushes the valve flap 22 to move to close the liquid level controller 20;

[0078] When the liquid level controller 20 is closed, the main chamber 15 is continuously filled with fluid medium. As the pressure of the fluid medium in the main chamber 15 continues to increase, the pressure of the fluid medium in the main chamber 15 pushes the main valve flap 12 to move and close the main valve assembly 10.

[0079] (4) Liquid level control process of the liquid storage device 101: When the liquid level in the liquid storage device 101 reaches the highest point, the liquid level controller 20 is closed, so that the main valve assembly 10 is also closed. This process has been described in detail in the above-mentioned main valve assembly 10 closing process and will not be repeated here;

[0080] When the liquid level in the liquid storage device 101 reaches the lowest point, first, as the liquid level in the liquid storage device 101 drops, when the liquid level drops to a predetermined position, a siphon phenomenon occurs between the control box 50 and the liquid storage device 101, and the fluid medium in the control box 50 is sucked into the liquid storage device 101 through the control pipe 60, so that the buoyancy of the float 41 disappears, the float 41 falls, and the sealing member 31 is separated from the channel 234, so that the chamber 211c is connected with the first outlet 213a through the channel 234, so that the fluid medium pressure of the chamber 211c is discharged through the first outlet 213a, and then the valve flap 22 moves under the action of the fluid medium pressure of the first inlet 211a, so that the liquid level controller 20 is opened, and then the main valve assembly 10 is opened, and a circulation process is entered to realize that the liquid level control 20 controls the opening and closing of the main valve assembly 10, so as to control the liquid level of the fluid medium in the liquid storage device 101.

[0081] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A liquid level control system for controlling the liquid level in a liquid storage device, It is characterized in that It includes a main valve assembly and a liquid level controller, wherein the liquid level controller is used to control the opening and closing of the main valve assembly; Wherein, the liquid level controller is installed in the liquid storage device to control the opening and closing of the main valve assembly to control the liquid level of the fluid medium in the liquid storage device. The liquid level controller includes a valve body assembly, a valve flap, a valve core, a floating assembly and a differential sealing assembly. The valve flap and the valve core are both arranged in the valve body assembly, the valve flap is connected to the valve core, and a chamber is formed between the valve flap and the valve body assembly. The valve body assembly is provided with a first outlet for the fluid medium to flow out, the valve flap is provided with a through hole, the valve core is provided with a channel, the through hole is connected with the channel, one end of the differential sealing assembly is used to cooperate with the valve core, and the other end is used to cooperate with the floating assembly; The floating assembly includes a buoy and a solid structure, wherein the solid structure fills the interior of the buoy, and the density of the solid structure is less than the density of the fluid medium; The liquid level controller also includes a control box and a control pipe, the floating assembly is arranged in the control box, the valve body assembly is arranged on the control box, the control box is provided with a control hole for allowing the fluid medium in the liquid storage device to flow into the control box, the control pipe has a highest point and a lowest point arranged relatively, the highest point of the control pipe is arranged close to the control hole, and the lowest point of the control pipe is arranged away from the control hole, one end of the control pipe is communicated with the inside of the control box, and the other end extends into a predetermined position in the liquid storage device; When the floating assembly is forced to float up, the floating assembly pushes the differential sealing assembly to seal the channel, thereby linking the valve flap to move to close the liquid level controller; When the floating assembly falls, the differential sealing assembly is separated from the passage, the chamber is communicated with the first outlet through the passage, and the valve flap moves to open the liquid level controller.

2. The liquid level controller according to claim 1, It is characterized in that The differential sealing assembly includes a sealing member, an installation cavity is provided on the valve body assembly, the first outlet is communicated with the installation cavity, the sealing member is accommodated in the installation cavity, one end of the valve core is installed in the installation cavity and cooperates with the sealing member, the other end of the valve core extends into the through hole, a gap is formed between the outer wall of the valve core and the inner wall of the through hole, and the size of the gap is adjustable.

3. The liquid level controller according to claim 2, It is characterized in that The valve body assembly is also provided with a first inlet and a second outlet, the chamber is located between the first outlet and the second outlet, the valve flap has an outer side facing the first inlet and an inner side facing the chamber, and the surface area of ​​the inner side of the valve flap is greater than the surface area of ​​the outer side of the valve flap.

4. The liquid level controller according to claim 3, It is characterized in that The liquid level controller also includes an air-injection valve flap. An air-injection cavity and an air-injection hole are provided on the valve body assembly. The air-injection cavity is connected to the first inlet. The air-injection valve flap is arranged in the air-injection cavity to achieve connection or isolation between the air-injection hole and the first inlet.

5. The liquid level controller according to claim 3, It is characterized in that The valve body assembly includes a valve body, a valve cover and a valve seat, the valve body is installed on the valve seat, the valve cover is arranged on the valve seat, the first inlet and the second outlet are both opened on the valve body, and the first outlet and the installation cavity are both opened on the valve seat.

6. The liquid level controller according to claim 3, It is characterized in that A filter device is provided at the first inlet, and the filter device is used to filter the fluid medium entering from the first inlet.

7. The liquid level controller according to claim 1, It is characterized in that One end of the control tube is a liquid inlet, and the other end is a liquid outlet. The liquid inlet extends into the liquid storage device and is close to the bottom of the liquid storage device. The liquid outlet is connected to the control box. The position of the liquid inlet is between the highest point and the lowest point.

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