CN210034607U - Liquid level controller - Google Patents

Abstract

The utility model relates to a liquid level control technical field especially relates to a liquid level controller. A liquid level controller is installed in a liquid storage device and used for controlling the liquid level of a fluid medium in the liquid storage device, and the liquid level controller comprises a valve body assembly, a valve core, a control box and a sealing assembly, wherein an installation cavity and a communication hole are formed in the valve body assembly, the control box is installed on the valve body assembly, one end of the valve core is installed in the installation cavity, a channel is formed in the valve core, one part of the sealing assembly is installed in the communication hole and extends into the control box from the communication hole, the other part of the sealing assembly is contained in the installation cavity and is used for being matched with the valve core to open/close the channel, the installation cavity and the control box are sealed, and the fluid medium in the installation cavity is prevented from entering the control box through the communication hole. The utility model has the advantages that: the operation is more stable and reliable.

Description

Liquid level controller

Technical Field

The utility model relates to a liquid level control technical field especially relates to a liquid level controller.

Background

And the liquid level controller is arranged in the liquid storage device and used for controlling the height of the liquid level in the liquid storage device. The liquid level controller can be divided into electronic liquid level switch control, floating ball switch control, siphon control and the like according to different control modes. The liquid level controller mainly controls the opening and closing of the valve so as to realize the height control of the liquid level by supplementing liquid to the liquid storage device.

The liquid level controller mainly comprises a valve body assembly, a sealing element, a control box, a floating assembly and the like, wherein the floating assembly is arranged in the control box, the sealing element is arranged on the valve body assembly and extends into the control box, so that the sealing element is matched with the floating ball assembly, the floating ball assembly is driven by buoyancy to actuate the sealing element, and therefore the opening/closing of the liquid level controller is controlled, and the opening and the closing of the control valve are realized. However, in the working process of the existing liquid level controller, a fluid medium is easy to enter into the control box, so that the floating ball assembly is subjected to the buoyancy effect in advance, the liquid level controller is abnormally closed, the normal work of the liquid level controller and the valve is further influenced, and the running stability is poor.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a liquid level controller that operates stably and reliably.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

a liquid level controller is installed in a liquid storage device and used for controlling the liquid level of a fluid medium in the liquid storage device, and the liquid level controller comprises a valve body assembly, a valve core, a control box and a sealing assembly, wherein an installation cavity and a communication hole are formed in the valve body assembly, the control box is installed on the valve body assembly, one end of the valve core is installed in the installation cavity, a channel is formed in the valve core, one part of the sealing assembly is installed in the communication hole and extends into the control box from the communication hole, the other part of the sealing assembly is contained in the installation cavity and is used for being matched with the valve core to open/close the channel, the installation cavity and the control box are sealed, and the fluid medium in the installation cavity is prevented from entering the control box through the communication hole.

In one embodiment, the sealing assembly includes a first sealing element, one end of the first sealing element is installed in the communication hole and extends into the control box from the communication hole, the other end of the first sealing element is used for being matched with the valve core to open/close the channel, the first sealing element is provided with an attraction portion, and the attraction portion attracts and attaches the sealing element to the wall of the installation cavity.

In one embodiment, the sealing assembly includes a second sealing element and a third sealing element, one end of the second sealing element is installed in the communication hole and extends into the control box from the communication hole, the third sealing element is arranged at one end of the second sealing element far away from the control box, and the third sealing element is used for being matched with the valve core to open/close the channel and seal the installation cavity and the control box.

In one embodiment, the third sealing element comprises a matching portion and a second sealing portion, the second sealing portion is mounted on the matching portion, the sealing portion is used for sealing between the mounting cavity and the control box, the matching portion is mounted on the second sealing element, and the second sealing element drives the matching portion to move so as to match with the valve core and open/close the channel.

In one embodiment, the surface of the sealing part facing the control box is sunken towards one side of the valve core to form a groove body.

It can be understood that, the sunken setting in surface of sealing not only can avoid the sealing with laminating tension between the inner wall of installation cavity is favorable to moreover the deformation takes place for the sealing, so that the sealing member drives the cooperation portion motion.

In one embodiment, the liquid level controller further comprises a positioning plate, and the positioning plate is used for positioning the sealing part and enabling the sealing part to be attached to the wall of the installation cavity.

In one embodiment, the positioning plate is provided with the communication hole, the sealing element is mounted in the communication hole, a part of the sealing portion is clamped between the positioning plate and the valve body assembly, and the positioning plate is connected with the valve body assembly.

In one embodiment, the positioning plate is accommodated in the installation cavity, one end of the positioning plate abuts against the seal, and the other end of the positioning plate abuts against the valve core.

In one embodiment, the mating end surface of the second sealing element and the valve core is a plane or a spherical surface.

In one embodiment, the end surface of the first sealing element, which is matched with the valve core, is a plane surface or a spherical surface.

It is understood that the end surface engaged with the valve core is a spherical surface, which facilitates the automatic alignment of the first seal or the second seal.

In one embodiment, the second seal is integral with the third seal.

Compared with the prior art, the liquid level controller is through setting up seal assembly, thereby will the installation cavity with seal and keep apart between the control box to avoid the fluid medium in the installation cavity to pass through the intercommunicating pore gets into in the control box, avoid promptly intake in advance in the control box, effectually prevented liquid level control closes in advance, has improved the stability and the reliability of liquid level controller operation.

Drawings

FIG. 1 is a control flow chart of the liquid level control system provided by the present invention;

FIG. 2 is a schematic structural view of a liquid level control system provided by the present invention;

fig. 3 is a schematic structural diagram of a main valve assembly provided by the present invention;

fig. 4 is an exploded view of the liquid level controller provided by the present invention;

fig. 5 is a cross-sectional view of the liquid level controller provided by the present invention;

fig. 6 is an enlarged view of a point a in fig. 5 according to the present invention;

fig. 7 is an enlarged view of the position B in fig. 6 according to the present invention;

fig. 8 is an enlarged view of C in fig. 8 according to the present invention;

fig. 9 is a schematic structural view of an anti-adhesion structure provided by the present invention;

fig. 10 is an enlarged view of fig. 9 at D according to the present invention;

fig. 11 is a schematic structural diagram of the valve flap provided by the present invention;

fig. 12 is a schematic structural view of a sealing structure in embodiment 1 provided by the present invention;

fig. 13 is a schematic structural view of an embodiment of a sealing structure in example 2 according to the present invention;

fig. 14 is an enlarged view of the point E in fig. 13 according to the present invention;

fig. 15 is an enlarged view of the seal structure of fig. 13 provided by the present invention;

fig. 16 is a schematic structural view of another embodiment of the sealing structure of fig. 13 according to the present invention;

fig. 17 is an enlarged view of the seal structure of fig. 16 provided by the present invention;

fig. 18 is a schematic structural view of a further embodiment of the sealing structure of fig. 13 according to the present invention;

fig. 19 is a schematic structural diagram of a control tube provided by the present invention;

fig. 20 is a schematic structural view illustrating the connection between the second bending pipe and the extension pipe according to the present invention;

fig. 21 is a schematic structural view of the exhaust pipe provided by the present invention.

In the drawing, a liquid level control system 100, a liquid storage device 101, a connection pipe 102, a main valve assembly 10, a main valve body 11, a main inlet 111, a main outlet 112, a main valve flap 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 mounting hole 21a, a valve body 211, a first inlet 211a, a second outlet 211b, a chamber 211c, a housing hole 211d, a valve port 211e, a relief chamber 211f, a limit step 211g, a valve cover 212, a relief hole 212a, a valve seat 213, a first outlet 213a, a mounting step 213b, a mounting chamber 213c, a positioning step 213d, a positioning step 213e, a positioning groove 213f, a connection hole 213g, a projection 2131, a fastener 214, a valve flap 22, an outer side 221 of the valve flap, an inner side 222 of the valve flap, a through hole 223, a guide block 227, a first mounting portion 224, a connection portion 225, a, The valve comprises a first end 231 of the valve core, a second end 232 of the valve core, a step 233, a channel 234, a first channel 234a, a second channel 234b, an elastic member 235, an anti-adhesion structure 24, a protrusion 241, a positioning plate 25, a communication hole 251, an auxiliary exhaust member 26, an exhaust pipe 261, a sealing component 30, a first sealing member 31, a suction portion 311, a second sealing member 32, a third sealing member 33, a matching portion 331, a plane 331a, a second sealing portion 332, a groove body 332a, a floating component 40, a float 41, a solid structure 42, a control box 50, a control hole 51, a containing cavity 52, a second mounting portion 53, a fixing hole 54, a control pipe 60, a liquid inlet 61, a liquid outlet 62, a first bent pipe 63, a second bent pipe 64, an extension pipe 65, a connecting sleeve 66, an anti-suction device 70, a complementary valve 71, a floating portion 711, a floating groove 711a, a complementary sealing member 712, a filtering device 80, a waterproof component 90, a, Waterproof cover 911, exhaust hole 912, sealing unit 92, sealing element 921.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, the present invention provides a liquid level controller system 100 for controlling the liquid level of a fluid medium in a liquid storage device 101 to realize the function of automatically supplying the fluid medium to the liquid storage device 101. In the present embodiment, the liquid storage device 101 may be a water tank, an oil tank, or the like, and the fluid medium may be water, oil, or the like.

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, and the liquid level controller 20 is disposed in the liquid storage device 101 and connected to the main valve assembly 10 for controlling the opening and closing of the valve assembly 10. In the present embodiment, the main valve assembly 10 is a general valve assembly, for example, the main valve assembly 10 may be an axial flow water control valve, a diaphragm water control valve, or the like. Of course, the liquid level controller 20 may also be used alone, that is, the liquid level controller 20 is connected to a pipeline assembly, and the liquid level of the liquid storage device 101 is controlled by opening/closing the liquid level controller 20 itself. Here, it should be explained that the fluid level of the fluid medium in the reservoir 101 refers to the height of the fluid medium at the position in the reservoir 101.

In the present embodiment, the structure and the control principle of the liquid level controller 20 are specifically described with the object that the liquid level controller 20 controls the opening or closing of the main valve assembly 10. 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.

Referring to fig. 3, the main valve assembly 10 includes a main valve body 11, a main valve flap 12, a main valve seat 13, and a main resilient member 14. The main valve 12 is installed in the main valve body 11, and a main chamber 15 is enclosed between the main valve body 11 and the main valve seat 13, the main valve body 11 is installed on the main valve seat, one end of the connecting pipe 102 is connected to the main valve body 11 and is communicated with the main chamber 15, a pilot hole is opened on the main valve 12, one end of the main valve 14 is installed in the pilot hole, a gap is formed between the outer wall of the main valve 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 12, and the other end abuts against the inner wall of the main chamber 15.

Furthermore, the main valve body 11 is provided with a main inlet 111 for the inflow of the fluid medium and a main outlet 112 for the outflow of the fluid and connected to the reservoir 101. A pilot hole 121 is formed in the main valve flap 12, and the main inlet 111 is communicated with the main chamber 15 through the pilot hole 121. The liquid level controller 20 controls the level of the fluid medium in the reservoir 101 by communicating and isolating between the primary inlet 111 and the primary outlet 112.

Referring to fig. 4, 5 and 6, the liquid level controller 20 includes a valve body assembly 21, a valve flap 22, a valve core 23, a sealing assembly 30, a floating assembly 40, a control box 50 and a control pipe 60. The valve clack 22 and the valve core 23 are arranged in the valve body assembly 21, a through hole 223 is formed in the valve clack 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, the sealing assembly 30 is arranged between the control box 50 and the valve body assembly 21, one end of the sealing assembly 30 is matched with the valve core 23, and the other end of the sealing assembly 30 is matched with the floating assembly 40, so that the floating assembly 40 drives the sealing assembly 30 to move, and the valve clack 22 moves to open and close the liquid level controller 20.

The valve body assembly 21 comprises a valve body 211, a valve cover 212 and a valve seat 213, the valve body 211 is installed on the valve seat 213 through threaded connection, welding connection and other modes, and the valve cover 212 is covered on the valve seat 213. Preferably, in this embodiment, the valve body 211 is screwed to the valve seat 213.

As shown in fig. 7 and 8, the valve body 211 is provided with a first inlet 211a for allowing a fluid medium to enter, a second outlet 211b for allowing the fluid medium to flow out, a containing hole 211d, and a valve port 211e, the valve flap 22, the valve body 211, and the valve seat 213 are connected by a fastening member 214 in a locking manner, the valve flap 22, the valve body 211, and the valve seat 213 define a chamber 211c therebetween, the first inlet 211a is used for being connected with an external pipe assembly to guide the fluid medium to enter the valve body 211, and the second outlet 211b is communicated with the liquid storage device 101, so that the fluid medium flowing out from the second outlet 211b can flow into the liquid storage device 101. The valve flap 22 is installed in the containing hole 211d, and the valve flap 22 moves under the action of pressure to control the opening or closing of the valve port 211e, so as to control the communication or the separation between the first inlet 211a and the second outlet 211b, thereby realizing the opening and closing of the liquid level controller 20.

Further, a quick-connection socket is arranged at the first inlet 211a, and the quick-connection socket is used for being matched with an external pipeline so as to realize quick connection of the external pipeline.

The valve body 211 is provided with a limit step 211g, the valve clack 22 is mounted on the limit step 211g and locked by the fastener 214, and the limit step 211g is used for limiting the deformation compression amount of the valve clack 22 in the locking process of the fastener 214.

In the absence of the limit step 211g, the compression amount (deformation) of the valve flap 22 is uncontrollably formed during the locking process of the fastening member 214, and when the fastening member 214 is locked more tightly, the valve flap 22 is further deformed, so that the valve flap 22 tends to move closer to the valve port 211e, i.e., the force applied by the valve flap 22 to seal the valve port 211e is larger, and conversely, the force applied to open the valve port 211e is required to be larger.

It can be understood that the limit step 211g is arranged so that the limit step 211g limits the compression amount of the deformation of the valve flap 22 during the locking process of the fastener 214, so that the compression amount of the valve flap 22 is within a certain range, thereby ensuring that the acting force of the valve flap 22 for sealing the valve port 211e is within a predetermined range and ensuring the uniformity of the opening/closing pressure of the liquid level control 20; meanwhile, the overlarge opening/closing pressure can be prevented, namely the liquid level controller 20 can be opened/closed under the condition of low pressure, and the application range of the liquid level controller 20 is enlarged.

An installation step 213b is provided on the valve seat 213, and the valve body 211 is installed on the installation step 213 b. Furthermore, the valve seat 213 is provided with a mounting cavity 213c and a first outlet 213a for allowing a fluid medium to flow out, the valve port 211e is located between the first outlet 213a and the second outlet 211b, one end of the first outlet 213a is communicated with the liquid storage device 101, the other end is communicated with the mounting cavity 213c, the valve element 23 is mounted in the mounting cavity 213c and connected with the valve flap 22, and the sealing assembly 30 is mounted in the mounting cavity 213c to be matched with the valve element 23. Furthermore, a protrusion 2131 is provided on the valve seat 213, and the mounting cavity 213c is opened on the protrusion 2131.

The valve flap 22 is approximately in the shape of a bowl, and the valve flap 22 is a rubber valve flap. Of course, in other implementations, the flap 22 may be a flap of other materials.

The valve flap 22 is provided between the valve body 211 and the valve seat 213, and an opening of the valve flap 22 is provided 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, the inner side 222 of the valve flap having a surface area larger than the surface area of the outer side 221 of the valve flap 22.

The through hole 223 places the chamber 211c in communication with the first inlet 211 a. One end of the valve core 23 extends into the through hole 223, 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 will be appreciated that the gap is a throttling channel, which gap is capable of regulating the pressure of the fluid medium entering the chamber 211c from the first inlet 211 a. The size of the gap is adjustable, that is, fluid media with different pressures can be adjusted to enter the chamber 211c, so that the liquid level controller 20 is adapted to different pressure system environments; meanwhile, when the system pressure value changes, the changed pressure can be prevented from damaging components in the system, such as the valve clack 22, the valve core 23 and the like, through the adjustment of the clearance. Preferably, the liquid level control 20 of the present invention is capable of adapting to 1MP and pressure system environments above 1 MP.

Further, as shown in fig. 9 to 11, the valve flap 22 includes a first mounting portion 224, a connecting portion 225, and a first sealing portion 226, the first mounting portion 224 is interposed between the valve body 211 and the valve seat 212, and the first mounting portion 224 is disposed on the limit step 211g and seals between the valve body 211 and the valve seat 212. The connecting portion 225 is disposed in the accommodating hole 211d, the connecting portion 225 is a deformation portion, and the valve flap 22 moves along the valve core 23, so that the connecting portion 225 is formed. The first sealing portion 226 is connected to the valve element 23, and the valve flap 22 moves the first sealing portion 226 along the valve element under pressure to open/close the valve port 211 e.

Preferably, the height of the limit step 211g is smaller than the thickness of the first mounting portion 224, so as to prevent the valve body 21 and the valve seat 23 from abutting against each other, resulting in a failure of the function of the limit step 211 g.

As shown in fig. 8 and 9, an anti-adhesion structure 24 is disposed between the valve flap 22 and the inner wall of the accommodating hole 211d, and the anti-adhesion structure 24 is used for preventing the valve flap 22 and the inner wall of the accommodating hole 211d from being adhered to each other. That is, it can be understood that the anti-bonding structure 24 serves to prevent a continuous water film from being formed between the valve flap 22 and the inner wall of the accommodation hole 211 d. Further, the valve flap 22 is prevented from being adsorbed on the inner wall of the accommodation hole 211 d. Here, the anti-adhesion structure 24 effectively prevents the valve flap 22 from being adsorbed on the inner wall of the accommodating hole 211d, so as to reduce the possibility of adhesion between the two, so that the valve flap 22 can be pushed open completely, the movement is smoother, the opening/closing of the liquid level controller 20 is easier, the maximum opening degree of the main valve assembly 10 can be ensured, and the water storage efficiency is improved.

Preferably, the anti-adhesion structure 24 is disposed between the connection portion 225 and an inner wall of the receiving hole 211 d.

In one embodiment, as shown in fig. 10, the anti-adhesion structure 24 includes a plurality of protrusions 241. Optionally, a plurality of the protrusions 241 are disposed at intervals on the outer side surface of the valve flap 22. It is understood that a plurality of the protrusions 241 may be provided at intervals on the inner wall of the receiving hole 211 d. In this embodiment, the protrusions 241 are disposed on the outer side surface of the valve flap 22 at intervals.

Preferably, a plurality of the protrusions 241 are provided at intervals on an outer side surface of the connection portion 225. One end of the protrusion 241 away from the valve flap 22 abuts against the inner wall of the accommodation hole 211 d. It can be understood that the projection 241 divides the water film between the connection part 225 and the inner wall of the receiving hole 211d into discontinuities, thereby detecting the possibility of the two being adhered to each other.

More preferably, the protrusions 241 are arranged on the outer side surface of the connecting portion 225 at intervals, the protrusions are rubber protrusions, and the protrusions 241 and the valve flap 22 are integrated, so as to facilitate the processing and manufacturing of the valve flap 22.

In another embodiment, the anti-adhesion structure 24 includes a hydrophobic coating (not shown) applied to the outer side of the valve flap 22 and/or the inner wall of the receiving hole 211 d. It will be appreciated that the hydrophobic coating is a coating that is mutually repellent to water, i.e. the hydrophobic coating has a contact angle with static water of greater than 90 degrees.

Preferably, the hydrophobic coating is coated on the outer side of the connection part 225. The hydrophobic coating can be made of polycarbonate, polyamide, polyacrylonitrile, polyester and the like. Of course, since in this embodiment the fluid medium is water, a hydrophobic coating is provided, which is correspondingly arranged to bank the coating of the other medium types if the fluid medium is replaced by the other medium type.

Further, as shown in fig. 11, a guide block 227 is disposed on the valve flap 22, and the guide block 227 is mounted on the first sealing portion 226. The through hole 223 is opened on the guide block 227, and the valve core 23 is arranged in the through hole 223 in a penetrating manner. Here, the valve core 23 doubles as a guide to guide the movement of the valve flap 22, so that the movement of the valve flap 22 is smoother and more stable.

Preferably, the guide block 227 has an i-shaped cross section. Of course, in other embodiments, the guide block 227 may have other cross-sectional shapes.

As shown in fig. 6 and 7, the valve element 23 is substantially rod-shaped, the cross section of the valve element 23 is "T" shaped, the valve element 23 has a first end 231 and a second end 232 which are oppositely arranged, the first end 231 of the valve element is installed in the installation cavity 213c and is hermetically connected with the installation cavity 213c, and the second end 23 of the valve element is inserted into the through hole 223 and extends into the first inlet 211 a. The gap is formed between the outer wall of the second end 23 of the spool and the inner wall of the through hole 223. It will be appreciated that the change in clearance can be achieved by changing the outer diameter of the second end 23 of the spool, i.e. by replacing a spool 23 of a different size.

Preferably, the valve core 23 has a step 233 thereon, and when the valve core 23 is installed in the installation cavity 213c, the step 233 abuts against the protrusion 2131, so as to achieve installation and positioning of the valve core 23.

The valve core 23 is provided with a channel 234, and the channel 234 is communicated with the chamber 211c to allow the fluid medium in the chamber 211c to flow out. Further, the inner diameter of the passage 234 is adjustable, it is understood that the passage 234 may also be used as a throttling passage, the passage 234 can adjust the pressure of the fluid medium flowing out of the chamber 211c, and the inner diameter of the passage 234 is adjustable, that is, the pressure of the fluid medium flowing out of the chamber 211c can be adjusted differently, so as to match the gap between the outer wall of the valve element 23 and the inner wall of the through hole 223, and further improve the capability of the liquid level controller 20 to adapt to different pressure systems; meanwhile, when the system pressure value changes, through the adjustment of the gap and the passage 234, the damage of the changed pressure to the components in the system can be further avoided, i.e. the service life of the liquid level controller 20 is prolonged.

Specifically, the passages 234 include a first passage 234a and a second passage 234b, and the inner diameters of the first passage 234a and the second passage 234b are adjustable. Of course, in other embodiments, the inner diameter of one of the first or second passages 234a, 234b may be adjustable. The first passage 234a communicates with the valve chamber 211c, and the second passage 234b has one end communicating with the first passage 234a and the other end for engagement with the seal assembly 30. Preferably, the axis of the first channel 234a is perpendicular to the axis of the second channel 234b, although in other embodiments, the axis of the first channel 234a may not be perpendicular to the axis of the second channel 234 b.

The valve core 23 is sleeved with an elastic element 235, one end of the elastic element 24 abuts against the protruding portion 2131, the other end abuts against the valve clack 22, and the elastic element 235 is used for resetting the valve clack 22.

As shown in fig. 7, a portion of the sealing assembly 30 is installed in the communication hole 213d and extends from the communication hole 213d into the control box 50 to be engaged with the floating assembly 40. It is understood that the sealing member 30 is moved in the communication hole 213d by the floating member 40 to open or close the passage 234. Another portion of the sealing assembly 30 is received in the mounting cavity 213c to cooperate with the valve element 23 to seal the passage 234 or to make the passage 234 conductive (i.e., open/close the passage 234), so as to block or communicate the first outlet 213a and the chamber 211 c; meanwhile, another portion of the sealing assembly 30 is also used for sealing the installation cavity 213c and the control box 50, and preventing the fluid medium in the installation cavity 213c from entering the control box 50 through the communication hole 213 d.

It can be understood that, the sealing assembly 30 seals between the installation cavity 213c and the control box 50, so as to prevent the fluid medium in the installation cavity 213c from entering the control box 50 through the communication hole 213d, i.e. to avoid the floating ball assembly 40 in the control box 50 from being subjected to the buoyancy in advance, and the sealing assembly 30 is driven to seal the passage 234, so that the liquid level controller 20 and the main valve assembly 10 are closed in advance, and the stability and reliability of the operation of the liquid level controller 20 are improved.

The communication hole 213d is formed in the bottom of the mounting cavity 213c, a positioning step 213e is formed between the mounting cavity 213c and the communication hole 213d, and another part of the sealing assembly 30 can abut against the positioning step 213e, so that the sealing assembly 30 is limited, and the sealing assembly 30 is prevented from falling off from the communication hole 213d and falling into the control box 50.

Example 1:

as shown in fig. 12, the sealing assembly 30 includes a first sealing member 31, one end of the first sealing member 31 is installed in the communication hole 213d and extends into the control box 50 from the communication hole 213d, the other end is used for opening/closing the channel 234 in cooperation with the valve core 23, the first sealing member 31 is provided with a suction portion 311, the suction portion 311 sucks and attaches the first sealing member 31 to the wall of the installation cavity 213c, so that the first sealing member 31 is sucked and attached to the positioning step 213 e.

The first seal 31 is generally "T" shaped in cross-section. The attraction part 311 is umbrella-shaped, and when the liquid level controller 20 is in the open mode, the first sealing member 31 with separate between the channel 234, the floating assembly 40 with the first sealing member 31 is also the separate state, namely the first sealing member 31 is in the natural state, under this state, the attraction part 311 with the location step 213e contacts, and under the effect of the attraction part 311, will the first sealing member 31 attracts and pastes on the location step 213e, thereby preventing the fluid medium in the installation cavity 213c from entering through the communication hole 213d in the control box 50.

Optionally, the suction portion 311 is made of a rubber material, and the suction portion 311 and the first sealing member 31 are connected to form an integral structure.

Further, the end surface of the first sealing member 31, which is matched with the floating assembly 40, is a plane surface or a spherical surface. Preferably, in the present embodiment, only a portion of the first seal 31 protrudes out of the communication hole 213d, the first seal 31 moves in the communication hole 213d, and the communication hole 213d has a certain guiding function on the first seal 31, so that the first seal 31 and the channel 234 can be tightly and accurately fitted, and the problem of misalignment between the first seal 31 and the valve body 20 caused by the floating assembly 40 shaking due to the fluctuation of the liquid level can be avoided.

Example 2:

as shown in fig. 13 to 15, the sealing assembly 30 includes a second sealing member 32 and a third sealing member 33, one end of the second sealing member 32 is installed in the communication hole 213d and extends into the control box 50 from the hole 213d, the third sealing member 33 is installed at one end of the second sealing member 32 away from the control box 50, and the third sealing member 33 is used for cooperating with the valve element 23 to open/close the passage 234 and sealing the installation cavity 213c and the control box 50.

The second sealing member 32 has substantially the same structure as the first sealing member 31 of embodiment 1, in that the second sealing member 32 of embodiment 2 is not provided with the suction portion 311, and the suction portion 311 is replaced with the third sealing member 33, but correspondingly, in embodiment 2, the third sealing member 33 is provided at the position and structure of the second sealing member 32, and is completely different from the position and structure of the suction portion 311 of embodiment 1 provided at the second sealing member 32, but actually has the same function and is used for sealing the installation cavity 213c and the control box 50. The structure of the third seal 33 is specifically described below.

Specifically, the third sealing element 33 includes a fitting portion 331 and a second sealing portion 332, the second sealing portion 332 is mounted on the fitting portion 331, the second sealing portion 332 is used for sealing the mounting cavity 213c and the control box 50, the fitting portion 331 abuts against the second sealing element 32, and the second sealing element 32 drives the fitting portion 331 to move so as to fit with the valve element 23.

In one embodiment, as shown in fig. 16 to 18, the fitting portion 331 and the second sealing portion 332 are formed as an integral structure, and are connected to the second sealing member 32 as an integral structure. That is, the third seal 33 and the second seal 32 are formed integrally. In another embodiment, the fitting portion 331 and the second sealing portion 332 are formed as an integral structure, but the fitting portion 331 and the second sealing portion 332 are formed as a separate structure from the second sealing member 32, that is, the second sealing member 32 and the third sealing member 33 are formed as a separate structure from each other, and it is understood that the second sealing member 32 and the third sealing member 33 may be formed as a separate structure or as an integral structure, depending on actual requirements.

The fitting portion 331 has a cylindrical shape, and one end of the fitting portion 331 is mounted on the second sealing member 32, and the other end thereof is fitted with the passage 234 to seal the passage 234 or open the passage 234.

In an embodiment, an end surface of the fitting portion 331 fitted to the valve element 23 is a flat surface 331 a. That is, the face sealing the channel 234 is planar. In another embodiment, an end surface of the fitting portion 331 fitted to the valve element 23 is a spherical surface. That is, the face sealing the channel 234 is spherical. Here, the spherical surface has a certain guiding function, which facilitates self-alignment between the fitting portion 331 and the spool 23.

The second sealing portion 332 has an umbrella shape, and the second sealing portion 332 is mounted on the positioning step 213 e.

Further, the surface of the second seal portion 332 facing the control box 50 is recessed toward the valve body 23 side to form a groove 332 a. Here, the surface of the second sealing portion 332 is recessed, which not only can avoid the over-tightening of the fit between the second sealing portion 332 and the positioning step 213e, and is beneficial to the deformation and the resetting of the second sealing portion 332, so that the second sealing member 32 drives the matching portion 331 to move, and seal the passage 234, thereby closing the liquid level controller 20, and further controlling the closing of the main valve assembly 10.

Preferably, the second sealing portion 332 and the fitting portion 331 are made of rubber material.

Further, as shown in fig. 13, the liquid level controller 20 further includes a positioning plate 25, and the positioning plate 25 is configured to position the second sealing portion 332 and make the second sealing portion 332 adhere to the wall of the mounting cavity 213 c. That is, the second sealing portion 332 is positioned on the positioning step 213e by the positioning plate 25.

In one embodiment, as shown in fig. 14 and 18, the positioning plate 25 is provided with the communication hole 213d, the second sealing member 32 is installed in the communication hole 213d, a positioning groove 213f is provided on a surface of the valve seat 213 close to the control box 50, the positioning groove 213f is communicated with the installation cavity 213c, a portion of the second sealing portion 332 is located in the positioning groove 213f, and the positioning plate 25 is installed in the positioning groove 213f and connected to the valve seat 213. That is, the second sealing portion 332 is partially interposed between the valve seat 213 and the positioning plate 25, thereby achieving the installation of the sealing structure.

Preferably, the positioning plate 25 is plate-shaped, and the positioning plate 25 is connected to the valve seat 213 by bolts, screws, or welding.

In another embodiment, as shown in fig. 16, the positioning plate 25 is accommodated in the mounting cavity 213c, one end of the positioning plate 25 abuts against the second sealing portion 332, and the other end abuts against the valve core 23. It is understood that the second sealing portion 332 is positioned on the positioning step 213e by the positioning plate 25 cooperating with the valve core 23.

Preferably, the positioning plate 25 has a ring shape, and a communication hole 251 is formed in the positioning plate 25, wherein the communication hole 251 communicates the mounting chamber 213 with the first outlet 213a, so that the fluid medium in the mounting chamber 213 can flow out from the first outlet 213 a.

One end of the valve core 23 close to the second sealing element 32 is provided with an abutting step, one end of the positioning plate 25 abuts against the abutting step, and the other end of the positioning plate 25 abuts against the second sealing part 332, so that the acting force of installing the valve core 23 acts on the positioning plate 25, the positioning plate 25 presses and abuts against the second sealing part 332 and the positioning step 213e, and the installation cavity 213c and the control box 50 are sealed and isolated.

Referring to fig. 5, the floating assembly 40 includes a float 41 and a solid structure 42, the solid structure 42 fills the inside of the float 41, and the density of the solid structure 42 is less than that of the fluid medium, so that the float 41 can float on the liquid level under the action of the fluid medium. Here, by filling the solid structure 42 in the float 41, situations such as insufficient buoyancy or loss of buoyancy, incapability of controlling the liquid level, and overflow of the fluid medium of the liquid storage device 101 due to the fact that the fluid medium enters the float 41 and the float 41 is broken or falls off are avoided.

Further, the float 41 is substantially cylindrical, the float 41 is disposed in the control box 50, and one end of the float 41 is engaged with the first sealing member 31. When the float 41 is floated by force, the float 41 pushes the first sealing member 31 to seal the passage 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 first sealing member 31 is separated from the passage 234, the chamber 211c is communicated with the first outlet 213a through the passage 234, and the valve flap 22 moves to open the liquid level controller 20. The solid structure 42 may be a polymer material such as polystyrene foam.

The control box 50 is substantially cylindrical, the control box 50 has two opposite ends, a first end of the control box 50 is mounted on the valve seat 213 through a detachable structure, a second end of the control box 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 snap structure, and the like. In this embodiment, the control box 50 is mounted on the valve seat 213 by a bolt structure.

Further, 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 reservoir 101 to flow into the control box 50, so that when the fluid medium level in the reservoir 101 rises to the control hole 51, the fluid medium flows into the control box 50, and the float 41 floats under the action of the buoyancy force to push the first sealing member 31 to seal the passage 234, so that the liquid level controller 20 is closed, and the main valve assembly 10 is closed to stop filling the liquid into the reservoir 101.

In this embodiment, the position of the control hole 51 may be set according to the level of the fluid medium in the reservoir 101 to be actually controlled. It will be appreciated that when the fluid medium in the reservoir 101 enters the control box 50 through the control port 51, i.e., the main valve assembly 10 closes and stops filling the reservoir 101, the level of the fluid medium in the reservoir 101 is at its maximum. Therefore, by arranging the control box 50 and the floating assembly 40, the liquid level of the fluid medium in the fluid storage device 101 can be flexibly controlled according to different working conditions.

Referring to fig. 4 and 19, the control tube 60 is a circular tube or a special-shaped tube, the control tube 60 has a highest point G and a lowest point L which are oppositely arranged, the highest point G of the control tube 60 is arranged close to the control hole 51, the lowest point L of the control tube 60 is arranged far from the control hole 51, one end of the control tube 60 is communicated with the inside of the control box 50, and the other end of the control tube 60 extends into a predetermined position in the liquid storage device 101.

Here, it should be explained that the predetermined position in the reservoir 101 is the position of the preset lowest liquid level in the reservoir 101. In this position, the float 41 is lowered, the chamber 211c communicates with the first outlet 213a via the passage 234, and the valve flap 22 is moved to open the level controller 20, thereby controlling the opening of the main valve assembly 10 to replenish the fluid medium in the reservoir 101.

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

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 pipe 60 or the control hole 51, at this time, a section of air is sealed in the control pipe 60, and at the same time, the float 41 is driven by the buoyancy force to seal the passage 234 with the first sealing element 31, 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 of the air in the control tube 60 decreases, and a siphon phenomenon occurs, so that the fluid medium in the control tank 50 flows into the liquid storage device 101 through the control tube 60, the buoyancy applied to the float 41 disappears, and the first sealing member 31 is separated from the passage 234, so that the valve flap 22 moves, and the liquid level controller 20 opens. In this embodiment, the control tube 60 is provided to accurately control the high and low liquid levels of the liquid storage device 101, so that frequent opening/closing of the liquid level controller 20 and the main valve assembly 10 is avoided, the service lives of the liquid level controller 20 and the main valve assembly 10 are prolonged by at least 10 times, and the low liquid level of the liquid storage device 101 can be adjusted and controlled according to different heights of the liquid storage device 101; secondly, avoided the open/close of liquid level controller 20 and main valve subassembly 10 frequent to the fluctuation of the medium pressure of fluid medium in the pipeline has been reduced, not only the noise is reduced, and the fluid medium in the liquid storage device 101 always is in high liquid level, easily forms the stagnant water district in the bottom of liquid storage device 101, causes the secondary pollution of fluid medium in the liquid storage device 101, sets up very rationally.

Here, the siphon phenomenon is a force phenomenon using a difference in liquid level so that the fluid medium in the control tank 50 flows into the reservoir 101 through the control pipe 60.

In this embodiment, since the area of the control tube 60 through which the fluid medium flows is constant, the amount of air that can be stored in the control tube 60 can be changed by changing the position of the highest point G of the control tube 60, and the air pressure in the control tube 60 can be changed, so that the height of the liquid level in the liquid storage device 101 is adjusted by changing the height of the siphon generated by the control tube 60.

Referring to fig. 7, one end of the control tube 60 is a liquid inlet 61, 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 communicated with the control box 50, and the fluid medium of the liquid storage device 101 enters the control box 50 through the liquid inlet 61.

Further, the control tube 60 may be a circular tube or other special-shaped tube, the control tube 60 includes a first bending tube 63 and a second bending tube 64, one end of the first bending tube 63 is communicated with the inside of the control box 50, the other end is connected to the second bending tube 64, one end of the second bending tube 64 far from the first bending tube 63 extends into a predetermined position in the liquid storage device 101,

the bending direction of the first bending tube 63 is opposite to the bending direction of the second bending tube 64. Specifically, the first bent tube 63 is substantially "U" shaped, and the second bent tube 64 is also substantially "U", and the orientation of the "U" shaped opening of the first bent tube 63 is set opposite to the orientation of the "U" opening of the second bent tube 64.

Preferably, the bending direction of the first bending portion first bending tube 63 faces the bottom of the liquid storage device 101, the bending direction of the second bending portion second bending tube 64 faces away from the bottom of the liquid storage device 101, the bending position of the first bending portion first bending tube 63 is a highest point G, the bending position of the second bending portion second bending tube 64 is a lowest point L, and the highest point G is higher than the liquid outlet 62.

Further, an integrated structure is provided between the first bending pipe 63 and the second bending pipe 64. Here, the control tube 60 may be integrally formed to facilitate the processing. Of course, in other embodiments, the first bending tube 63 and the second bending tube 64 may be disposed in a split structure. The specific arrangement between the first bending pipe 63 and the second bending pipe 64 can be selected according to actual conditions. In the present embodiment, the first bending pipe 63 and the second bending pipe 64 are integrally formed.

It can be understood that when the fluid medium in the control box 50 rises to the outlet 62 of the control tube 60, i.e. the fluid medium enters from the inlet 61 and rises to the height of the outlet 62, the fluid medium enters into the control tube 60 through the outlet 62, and at this time, a section of air is trapped in the control tube 60 due to the height difference between the highest point G and the outlet 62; when the liquid level of the fluid medium in the liquid storage device 101 decreases, the air sealed in the control tube 60 is slowly drawn to be thin (the liquid level in the control tube also decreases, and the space increases), so that a siphon phenomenon is generated, and the fluid medium in the control box 50 flows into the liquid storage device 101 through the control tube 60, and then the buoy 41 falls.

With continued reference to fig. 19, the control tube 60 further includes an extension tube 65, the extension tube 65 is connected to an end of the second bending tube 64 away from the first bending tube 63, and the extension tube 65 extends into the liquid storage device 101.

It can be understood that, by providing the extension pipe 65, that is, by extending the depth of the control pipe 60 into the liquid storage device 101, a safety margin is increased, and when the liquid level controller 20 is abnormal and the siphon length is increased, the extension pipe 60 can still cause a siphon phenomenon to occur between the control box 50 and the liquid storage device 101, so that the fluid medium in the control box 50 is discharged, and the liquid level controller 20 operates normally. In this way, the operation of the liquid level controller 20 is not only made more stable and reliable.

In one embodiment, as shown in fig. 20, the extension pipe 65 and the second bending pipe 64 are connected to each other by a connection sleeve 66. Preferably, the second bending pipe 64 is screwed and sealed with the connecting sleeve, and the extension pipe 65 is screwed and sealed with the connecting sleeve 66. Of course, in other embodiments, the extension tube 65 and the second bending tube 64 may be connected by other means, for example, the extension tube 65 and the second bending tube 64 are directly connected by a screw thread.

It will be appreciated that in this embodiment, the extension tube 65 and the second curved tube 64 are provided in a split arrangement, which facilitates handling of the tubes for transport and packaging.

In another embodiment, the extension tube 65 and the second bending tube 64 are provided as a single structure. This may facilitate consistent manufacturing of the control tube 60.

Of course, in other embodiments, the control tube 60 may be configured to automatically suck the fluid medium in the control box 50 back into the reservoir 101 when the liquid level in the reservoir 101 drops.

As shown in fig. 5 to 7, the liquid level controller 20 further includes an anti-suck back device 70 and a filtering device 80, wherein the anti-suck back device 70 is disposed 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, which results in contamination of the fluid medium from the first inlet 211 a; the filtering device 80 is disposed at the first inlet 211a for filtering the flowing medium flowing through the first inlet 211 a.

The valve body 211 is further provided with an air supplement cavity 211f, and the air supplement cavity 211f is communicated with the first inlet 211 a. The valve cover 212 covers the air supplement cavity 211f, an air supplement hole 212a is formed in the valve cover 212, and the air supplement hole 212a is communicated with the external atmospheric pressure. The suck-back device 70 comprises an air supply valve flap 71, and the air supply valve flap 71 is installed in the air supply cavity 211f and is used for being matched with the air supply hole 212a so as to realize communication or partition between the air supply hole 212a and the first inlet 211 a. When the fluid medium flows in from the first inlet 211a and flows out from the second outlet 211, the air supplement valve flap 71 moves the air supplement valve flap 71 under the buoyancy of the fluid medium and seals the air supplement hole 212 a; when the fluid medium level in the liquid storage device 101 exceeds the second outlet 211, so that negative pressure occurs in the first inlet 211a, or no fluid medium exists in the first inlet 211a, the buoyancy of the fluid medium at the first inlet 211a disappears, and the air compensation valve flap 71 falls down, so that the first inlet 211a is communicated with the external atmospheric pressure, and the fluid medium at the second outlet 211 is prevented from flowing back to the first inlet 211a, thereby causing pollution.

Further, the air supply valve flap 71 includes a floating portion 711 and an air supply sealing member 712, the air supply sealing member 712 is mounted on the floating portion 711, and a floating groove 711a is formed in the floating portion 711 to increase a force-bearing area of the floating portion 711, so that a sealing force for sealing the air supply hole 212a is increased, and the sealing is more reliable.

As shown in fig. 6 and 7, the filter device 80 includes a filter net or a filter, and the filter net is made of stainless steel. The filtering device 80 is provided to allow the liquid level controller 20 to be used as a control valve alone, which has a wide application prospect.

As shown in fig. 4 to 7, the liquid level controller 20 further includes a waterproof assembly 90, the waterproof assembly 90 is disposed on the control box 50, and the waterproof assembly 90 is used for preventing the fluid medium from entering the control box 50 from the control hole 51 during the fluid medium flowing into the reservoir 101, i.e., during the fluid medium storage process.

It can be understood that, during the process of water supply (liquid storage) of the liquid storage device 101, if the control box 50 is supplied with water in advance, the floating assembly 40 is subjected to the buoyancy of the fluid medium in advance, so as to drive the first sealing member 31 to seal the passage 234, and cause the passage 234 to be closed in advance, that is, the liquid level controller 20 is closed, thereby affecting the normal operation of the liquid level controller 20 and the main valve assembly 10, and by providing the waterproof assembly 90, the above situation can be avoided, and the normal operation of the liquid level controller 20 and the main valve assembly 10 is ensured; at the same time, the operation of the liquid level controller 20 is made more stable.

Specifically, the waterproof assembly 90 includes a waterproof unit 91, the waterproof unit 91 is disposed on the control box 50, and forms an accommodating cavity 52 with the control box 50, and the control hole 51 is located in the accommodating cavity 52 to protect the control hole 51, so as to prevent fluid medium splashed in the liquid storage device 101 from entering the control box 50 from the control hole 51.

Further, a second mounting portion 53 is convexly provided at one end of the control box 50 close to the valve body assembly 21 in a radial direction of the control box 50, the valve body assembly 21 is connected to the second mounting portion 53 through a detachable structure, and the control pipe 60 is also mounted on the second mounting portion 53.

The waterproof unit 91 is disposed between the control box 50 and the valve body assembly 21, and encloses the accommodating cavity 52 with the second mounting portion 53, and is opened on the sidewall of the control box 50.

Preferably, the waterproof unit 91 is a waterproof cover 911, and the waterproof cover 911 covers the control box 50. Of course, in other embodiments, the waterproof unit 91 may also be a waterproof baffle, and the waterproof baffle is disposed at the control box 50 where the control hole 51 is opened, so that the control hole 51 is shielded by the waterproof baffle.

The waterproof unit 91 is provided with an exhaust hole 912, and the exhaust hole 912 is communicated with the accommodating cavity 52. Here, the air vent 912 is opened to ensure that the fluid medium can smoothly flow into the control box 50 through the control hole 50 when the fluid medium level in the reservoir device 101 rises to a predetermined level.

The number of the exhaust holes 912 may be plural, and the plural exhaust holes 912 are arranged on the waterproof unit 91 along the circumferential direction of the control box 50; meanwhile, the position of the exhaust hole 912 is staggered with the position of the control hole 51 along the circumferential direction of the control box 50, so that the splashed fluid medium is prevented from directly entering the control hole 51 from the exhaust hole 912.

Further, the waterproof assembly 90 further includes a sealing unit 92, wherein the sealing unit 92 is disposed between the control box 50, the control pipe 60 and the valve body 21, and is used for preventing fluid medium from flowing downstream to the control hole 51 from a gap between the control box 50, the control pipe 60 and the valve body 21, and entering the control box 50 from the control hole 51. It is understood that, in the case of the sealing unit 92, the position of the control hole 51 may be set as desired as long as it is located in the receiving cavity 52.

Of course, the control box 50 may be provided with only the waterproof unit 91 or the sealing unit 92, i.e., the fluid medium is prevented from entering the control box 50 from one side; however, the control box 50 is provided with the waterproof unit 91 and the sealing unit 92 at the same time, i.e., a double protection, to prevent the fluid medium from entering the control box 50.

In this embodiment, the waterproof unit 91 and the sealing unit 92 are provided on the control box 50 at the same time, so that the fluid medium is prevented from entering the control box 50 as much as possible, and the reliability of the operation of the liquid level controller 20 is improved.

Further, the sealing unit 92 includes a sealing element 921, the control box 50 is provided with a fixing hole 54, the valve body assembly 21 is provided with an installation hole 21a, the position of the installation hole 21a corresponds to the position of the fixing hole 54, the control tube 60 is inserted into the fixing hole 54 and the installation hole 21a, and the sealing element 921 is sleeved on the control tube 60 and seals the abutting joints between the control tube 60 and the hole wall of the fixing hole 54, between the control tube 60 and the hole wall of the installation hole 21a, and between the fixing hole 54 and the installation hole 21 a.

Preferably, a positioning step is arranged on the inner wall of the fixing hole 54, and the sealing element 921 is mounted on the positioning step, so that the mounting of the sealing element 921 is realized; the mounting hole 21a is opened in the valve seat 213.

The sealing element 921 may be a rubber sealing ring, or a sealant or the like filled between the control tube 60 and the fixing hole 54. In this embodiment, the sealing element 921 is a sealant, a gasket, or the like.

Further, a sealing ring is further arranged between the control box 50 and the valve body assembly 21, the sealing ring seals a gap between the control box 50 and the valve body assembly 21, so that a fluid medium is further prevented from permeating into the control box 50 from the gap between the control box 50 and the valve body assembly 21, and the reliability of the liquid level controller 20 is improved.

Of course, in another embodiment, the sealing unit 92 may not be provided, and in this embodiment, the positions of the control holes 51 in the control box 50 and the positions of the control tubes in the control box 50 are offset from each other along the circumferential direction of the control box 50; so that fluid medium is prevented from flowing down the gap between the control box 50 and the control tube 60 to the control hole 51 into the control box 50.

Further, as shown in fig. 5 and 6, an auxiliary exhaust member 26 is further disposed on the valve body assembly 21, the auxiliary exhaust member 26 is communicated with the inside of the control box 50, and the auxiliary exhaust member 26 is used for guiding the gas in the control box 50 to be exhausted in the process that the fluid medium flows into the control box.

When the liquid level of the fluid medium in the liquid storage device 101 reaches the height of the control hole 51, the fluid medium in the liquid storage device 101 enters the control box 50 through the control hole 51, so that the floating assembly 40 is subjected to the buoyancy of the fluid medium to drive the first sealing element 31 to seal the passage 234, thereby controlling the valve flap 22 to move to close the liquid level controller 20. However, when the liquid level of the fluid medium in the liquid storage device 101 rises too fast, the control hole 51 is submerged, at this time, a closed space is formed inside the control box 50, the fluid medium cannot enter the control box 50 from the control hole 51, so that the floating assembly 40 cannot be subjected to the action of buoyancy or the buoyancy is too small, the liquid level controller 20 cannot be closed or the closing speed is too slow, and if the liquid level controller 20 cannot be closed, that is, the main valve assembly 10 cannot be closed or the closing speed is too slow, the fluid medium in the liquid storage device 101 is easy to overflow.

It can be understood that, by providing the auxiliary exhaust member 26, even when the liquid level of the fluid medium in the liquid storage device 101 rises too fast to submerge the control hole 51, the gas in the control box 50 can be smoothly exhausted out of the control box 50, so that the fluid medium can smoothly enter the control box from the control hole 51, and further, under the action of the fluid medium, the floating assembly 40 can normally respond and control the first sealing member 31 to seal the passage 234, so that the liquid level controller is normally closed, the control effect of the liquid level controller is improved, and the fluid medium in the liquid storage device 101 is prevented from overflowing.

Specifically, as shown in fig. 21, the auxiliary exhaust member 26 includes an exhaust pipe 261, a connection hole 213g is opened in the valve body assembly 21, the connection hole 213g is communicated with the inside of the control box 50, one end of the exhaust pipe 261 is installed in the connection hole 213g, and the other end extends out of the connection hole 213 g.

Preferably, the connection hole 213g is opened in the valve seat 213. The exhaust pipe 261 is screw-coupled to the coupling hole 213 g.

In one embodiment, the exhaust pipe 261 is curved, and an opening of an end of the exhaust pipe 261 away from the control box 50 is disposed toward the control box 50. Here, since the opening of the exhaust pipe 261 far from the end of the control box 50 is disposed toward the control box 50, the fluid medium that splashes can be prevented from entering the control box 50 through the exhaust pipe 261, and the floating assembly 40 is prevented from being subjected to buoyancy in advance, the liquid level controller is closed, and the stability of the operation of the liquid level controller is improved.

In another embodiment, an end of the exhaust pipe 261 protruding out of the connection hole 213g is provided with a bent pipe 262, and an opening of the bent pipe 262 at an end away from the exhaust pipe 261 is disposed toward the control box 50. It is understood that the bent pipe 262 is provided to prevent the fluid medium from being splashed from entering the control box 50 through the exhaust pipe 261, as in the case of the exhaust pipe 261 having a bent shape.

Preferably, the bent pipe 262 and the exhaust pipe 261 are provided in an integrated structure to facilitate processing and manufacturing of the exhaust pipe 261. Of course, in other embodiments, the bent pipe 262 and the exhaust pipe 261 may not be an integral structure.

Further, a sealing member is disposed between an outer wall of the exhaust pipe 261 and an inner wall of the connection hole 213g, and the sealing member is configured to seal a gap between the outer wall of the exhaust pipe 261 and the inner wall of the connection hole 213 g. It is understood that by providing the sealing member, it is possible to prevent the fluid medium from entering the control box 50 from the gap between the outer wall of the exhaust pipe 261 and the inner wall of the connection hole 213g, so that the floating assembly 40 receives the buoyancy in advance, and the liquid level controller 20 is closed.

It is understood that in this embodiment, the auxiliary exhaust member 26 may cooperate with the exhaust hole 912 to guide the exhaust of the gas in the control box 50 to provide the exhaust speed of the gas. Of course, in other embodiments, the exhaust hole 912 may be eliminated, and only the auxiliary exhaust member 26 is retained, so that the gas in the control box 50 can be rapidly exhausted.

The working principle of the liquid level controller 20 is explained below:

(1) initial state: the main valve assembly 10 is in the closed position under the action of the main spring; the float 41 is dropped into the control box 50 by its own weight, the valve cavity 211c is communicated with the first outlet through the passage 234, and the liquid level controller 20 is in an open state.

(2) Main valve assembly 10 opening process: 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, flows through the connecting pipe 102 to the liquid level controller 20, and due to the initial state, the liquid level controller 20 is in the 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; meanwhile, part of the fluid medium flows out to the reservoir 101 through the through hole 223, the chamber 211c, the channel 234 and the first outlet 213 a; at this point, there is no pressure of the fluid medium in the main chamber 15, and under the pressure of the fluid medium itself, the main valve flap 12 moves, the main valve assembly 10 is opened, and fluid medium flows from the main outlet 112 into the reservoir 101.

(3) Main valve assembly 10 closing process: 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 pipe 60 on the control box 50; at this time, the float 41 is under the buoyancy of the fluid medium to drive the sealing assembly 30 to seal the channel 234, as the chamber 211c is continuously filled with the fluid medium, the pressure in the chamber 211c is continuously increased and the surface area of the inner side 222 of the valve flap is larger 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 value, the pressure of the fluid medium in the chamber 211c pushes the valve flap 22 to move to close the liquid level controller 20;

when the level controller 20 is closed, the main chamber 15 is continuously filled with fluid medium, and as the pressure of the fluid medium in the main chamber 15 continuously increases, the pressure of the fluid medium in the main chamber 15 pushes the main valve flap 12 to move, and the main valve assembly 10 is closed.

(4) The liquid level control process of the liquid storage device 101 is as follows: 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, which has been described in detail in the closing process of the main valve assembly 10, and is not described again;

when the liquid level in the liquid storage device 101 reaches the lowest point, firstly, as the liquid level in the liquid storage device 101 drops, when the liquid level drops to a predetermined position, a siphon phenomenon is generated between the control box 50 and the liquid storage device 101, 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 force applied to the float 41 disappears, the float 41 drops, the sealing assembly 30 is separated from the passage 234, the chamber 211c is communicated with the first outlet 213a through the passage 234, the fluid medium pressure of the chamber 211c is discharged through the first outlet 213a, and the valve flap 22 moves under the fluid medium pressure of the first inlet 211a, so that the liquid level controller 20 is opened, and further, the main valve assembly 10 is opened to enter a circulation process, so that the liquid level control 20 controls the opening and closing of the main valve assembly 10, and the control of the liquid level of the fluid medium in the liquid storage device 101 is achieved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A liquid level controller is arranged in a liquid storage device and used for controlling the liquid level of a fluid medium in the liquid storage device, and the liquid level controller is characterized by comprising a valve body assembly, a valve core, a control box and a sealing assembly, wherein a mounting cavity and a communication hole are formed in the valve body assembly, the control box is arranged on the valve body assembly, one end of the valve core is arranged in the mounting cavity, a channel is formed in the valve core, one part of the sealing assembly is arranged in the communication hole and extends into the control box from the communication hole, the other part of the sealing assembly is contained in the mounting cavity and is used for being matched with the valve core to open/close the channel, the mounting cavity and the control box are sealed, and the fluid medium in the mounting cavity is prevented from entering the control box through the communication hole.

2. The liquid level controller according to claim 1, wherein the sealing assembly comprises a first sealing member, one end of the first sealing member is installed in the communicating hole and extends into the control box from the communicating hole, the other end of the first sealing member is used for opening/closing the channel in cooperation with the valve core, and the first sealing member is provided with an attraction portion which attracts and attaches the first sealing member to the wall of the installation cavity.

3. The fluid level controller of claim 1, wherein the seal assembly includes a second seal and a third seal, the second seal having one end mounted in the communication hole and extending into the control box from the communication hole, the third seal being disposed at an end of the second seal remote from the control box, the third seal being configured to engage the valve element to open/close the passage and seal between the mounting chamber and the control box.

4. The liquid level controller of claim 3, wherein the third sealing element comprises a fitting portion and a second sealing portion, the second sealing portion is mounted on the fitting portion, the second sealing portion is used for sealing between the mounting cavity and the control box, the fitting portion is mounted on the second sealing element, and the second sealing element drives the fitting portion to move to fit with the valve core to open/close the channel.

5. The liquid level controller according to claim 4, wherein a surface of the second seal portion facing the control box is recessed toward the spool side and forms a groove.

6. The liquid level controller of claim 4, further comprising a positioning plate for positioning the second sealing portion and engaging the second sealing portion with the wall of the mounting chamber.

7. The liquid level controller according to claim 6, wherein the positioning plate is provided with the communication hole, the second sealing member is mounted in the communication hole, a portion of the second sealing portion is interposed between the positioning plate and the valve body assembly, and the positioning plate is connected to the valve body assembly.

8. The liquid level controller of claim 6, wherein the positioning plate is accommodated in the mounting cavity, one end of the positioning plate abuts against the second sealing portion, and the other end of the positioning plate abuts against the valve core.

9. The liquid level controller of claim 3, wherein the mating end surface of the third seal and the valve element is a plane or a spherical surface.

10. The liquid level controller of claim 3, wherein the second seal is provided as one piece with the third seal.

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