CN213361201U - Liquid level control valve - Google Patents

Abstract

The utility model aims at providing a liquid level control valve which can be used as a high liquid level and a low liquid level and can control the liquid level position to be adjustable in height, when a buoy drives a valve core assembly to open an air inlet and close an air outlet, the air inlet is communicated with a working port, compressed air comes out from the working port to control the opening of an oiling bottom valve or an oil filling bottom valve, and normal oiling or oil filling operation is carried out; when the float bowl drives the valve core assembly to close the air inlet and simultaneously open the air outlet, the air outlet is communicated with the working port, compressed air is discharged from the air outlet, the oiling bottom valve or the oil filling bottom valve is closed, and oiling or oil filling operation is stopped; the first spring clamp is inserted into different first jacks to change the position of the buoy, the elastic force of the third spring always drives the buoy and the ejector rod to be away from each other, and in addition, the blocking of the first spring clamp locks the positions of the buoy and the ejector rod relatively, so that the purpose of controlling the height of the liquid level position to be adjustable is achieved.

Description

Liquid level control valve

Technical Field

The utility model relates to a tank-type tank service truck technical field, concretely relates to level control valve.

Background

The tank type fuelling vehicle is a common fuelling and oil transporting device, the principle is as shown in figure 1, when an oil tank 1 is used for fuelling other oil receiving devices through an oil pumping system, in order to prevent compressed air from entering a pipeline to damage an oil pump and influence metering accuracy, a low liquid level valve 2 is arranged at the bottom of the oil tank, and the opening and closing of a fuelling bottom valve 3 are directly controlled; when external equipment fills oil into the oil tank 1, in order to prevent potential safety hazard caused by excessive overflow of the oil filled in the oil tank 1, the top of the oil tank is provided with a high liquid level valve 4 which directly controls the opening and closing of an oil filling bottom valve 5. The working principle of the high and low level valves 4, 2 is similar, and the working process of the low level valve 2 is described as an example below: one side of the low liquid level valve 2 is provided with an air inlet communicated with an air source, the other side of the low liquid level valve is provided with a working port communicated with the oiling bottom valve 3, a floating barrel connected with a valve core is arranged in the valve cavity, when the floating barrel is in a sinking position (when the liquid level of fuel oil in the oil tank is in a set lowest liquid level), the valve core is in a state that the air inlet is closed and the working port exhausts, the oiling bottom valve 3 automatically closes along with the decompression, and the oiling operation stops; when a certain amount of fuel oil is stored in the oil tank, the low liquid level valve 2 floats due to the float bowl, the valve core enables the air inlet to be opened and the air outlet to be closed, the air inlet is communicated with the working port, at the moment, compressed air comes out from the working port, the oiling bottom valve 3 is opened under the action of air pressure, and oiling to external equipment is allowed to be carried out from the oiling bottom valve 3.

The utility model patent named "a self-checking type magnetic control liquid level valve" (No. CN209606855U) discloses following technical scheme: including the air chamber casing of seting up gas cavity, the gas cap room, fixed connection is in the piston barrel subassembly of air chamber casing below, set up the magnetic control switch subassembly in the gas cavity and set up in the inside and float connection of piston barrel subassembly in the flotation pontoon subassembly below of air chamber casing, the through-hole has been seted up along its central axis to the flotation pontoon inside, the flotation pontoon passes through the through-hole cover and locates the lower part of flotation pontoon guide arm and lock relatively with the position of flotation pontoon guide arm, the second bayonet lock is inserted the position of card pinhole that the position leaned on down in order to restrict the flotation pontoon, thereby make the flotation pontoon can drive flotation pontoon guide. In the above solution, although the position of the float and the float guide rod is mentioned to be locked relatively, there is no technical feature for achieving the purpose, and when the liquid level valve is installed at the top of the oil tank and used as a high liquid level valve, the height of the float position can be barely adjusted, but the liquid level valve cannot be installed at the bottom of the oil tank and used as a low liquid level valve.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can be used as high liquid level and can be used as low liquid level and control liquid level position height-adjustable's liquid level control valve again.

In order to realize the above purpose, the utility model discloses a technical scheme as: the utility model provides a liquid level control valve, set up the communicating air inlet with the valve pocket on the valve body, gas vent and work opening, the flotation pontoon passes through the ejector pin and links to each other with the case subassembly in the valve pocket, when the flotation pontoon reciprocates because of dead weight or buoyancy, drive case subassembly and open/close air inlet and gas vent in turn, the flotation pontoon includes the barrel, the ejector pin inserts in the barrel, be provided with the third spring in the cavity between barrel and the ejector pin, the length direction of third spring is unanimous with the length direction of ejector pin, the third spring provides the axial position of elasticity restriction ejector pin and flotation pontoon, be provided with a plurality of first jacks along its length direction even interval on the ejector pin, first spring card inserts in the first jack and offsets with the flotation pontoon and leans on the axial position of restriction flotation.

In the scheme, when the float bowl drives the valve core assembly to open the air inlet and close the air outlet, the air inlet is communicated with the working port, compressed air flows out of the working port to control the opening of the oiling bottom valve or the oil filling bottom valve, and normal oiling or oil filling operation is carried out; when the float bowl drives the valve core assembly to close the air inlet and simultaneously open the air outlet, the air outlet is communicated with the working port, compressed air is discharged from the air outlet, the oiling bottom valve or the oil filling bottom valve is closed, and oiling or oil filling operation is stopped; the first spring clamp is inserted into different first jacks to change the position of the buoy, the elastic force of the third spring always drives the buoy and the ejector rod to be away from each other, and in addition, the blocking of the first spring clamp locks the positions of the buoy and the ejector rod relatively, so that the purpose of controlling the height of the liquid level position to be adjustable is achieved.

Drawings

FIG. 1 is a schematic view of liquid level control for a tank fuelling vehicle;

FIG. 2 is an external view of the liquid level control valve;

fig. 3 and 4 are schematic diagrams of the internal structure of fig. 2;

FIG. 5 is an exploded view of the valve body, valve core assembly;

FIG. 6 is a top view of the valve body, valve core assembly;

FIG. 7 is a cross-sectional view A-A of FIG. 6;

FIG. 8 is a cross-sectional view B-B of FIG. 6;

FIG. 9 is a schematic view of the valve stem configuration;

FIG. 10 is a schematic view of the low level valve in a situation where the fuel level in the tank is below a set minimum level;

FIG. 11 is a schematic view of the low level valve in a state where the fuel level of the tank is above a set minimum level;

FIG. 12 is a schematic view of the high level valve in a situation where the fuel level in the tank is above a set maximum level;

fig. 13 is a schematic view of the high level valve in a state where the fuel level in the tank is lower than a set maximum level.

Detailed Description

When the liquid level control valve is arranged at the bottom of the oil tank 1 to control the opening and closing of the oiling bottom valve 3, the liquid level control valve is called a low liquid level valve, and when the liquid level control valve is arranged at the top of the oil tank 1 to control the oil filling bottom valve 5, the liquid level control valve is called a high liquid level valve. The present invention is discussed in further detail below in conjunction with fig. 1-13.

A liquid level control valve, the valve block 10 is equipped with the air inlet 11, exhaust port 12 and working port 13 communicating with valve chamber 14, the float 30 couples to valve core assembly 20 in the valve chamber 14 through the knockout pin 40, when the float 30 moves up and down because of dead weight or buoyancy, the float 30 comprises a cylinder 31, a push rod 40 is inserted into the cylinder 31, a third spring 34 is arranged in a cavity between the cylinder 31 and the push rod 40, the length direction of the third spring 34 is consistent with the length direction of the push rod 40, the third spring 34 provides elastic force to limit the axial positions of the push rod 40 and the float 30, a plurality of first insertion holes 44 are uniformly arranged on the push rod 40 along the length direction at intervals, and first spring clamps 45 are inserted into the first insertion holes 44 and abut against the float 30 to limit the axial position of the float 31 and control the liquid level position height of the oil tank 1. The float 30 drives the valve core assembly 20 to open the air inlet 11 and close the air outlet 12 at the same time, at this time, the air inlet 11 is communicated with the working port 13, compressed air comes out from the working port 13, and the opening of the oiling bottom valve 3 or the oil filling bottom valve 5 is controlled, so that normal oiling or oil filling operation is carried out; when the float 30 drives the inlet valve core assembly 20 to close the air inlet 11 and simultaneously open the air outlet 12, the air outlet 12 is communicated with the working port 13, compressed air is discharged from the air outlet 12, the oiling bottom valve 3 or the oil filling bottom valve 5 is closed, and oiling or oil filling operation is stopped; the top rod 40 is provided with a plurality of first insertion holes 44 at regular intervals along the length direction thereof, the first spring clips 45 are inserted into the first insertion holes 44 and abut against the float 31 to limit the axial position of the float 31 and control the height of the liquid level position of the oil tank 1, the first spring clips 45 are inserted into the first insertion holes 44 at different positions to adjust the installation position of the float 30 on the top rod 40, that is, the liquid level valve controls the liquid level height position of the oil tank 1 to be adjustable, as a low liquid level valve, the residual oil amount of the oil tank 1, namely the aforementioned "set lowest liquid level", and as a high liquid level valve, the full oil amount of the oil tank 1, namely the aforementioned "set highest liquid level", can be adjusted; the first spring clips 45 are inserted into different first insertion holes 44 to change the position of the float 30, the elastic force of the third spring 34 always drives the float 30 and the ejector rod 40 to move away from each other, and the positions of the float 30 and the ejector rod 40 are locked relatively due to the blocking of the first spring clips 45, so that the purpose of controlling the height of the liquid level position to be adjustable is achieved.

Further, a sleeve 33 is concentrically arranged at the center of the inner cavity of the cylinder 31, end covers 32 are arranged at two ends of the cylinder 31, the end covers 32 fixedly connect the cylinder 31 and the sleeve 33, the outer wall of each end cover 32 forms a sealing fit with the inner wall of the cylinder 31 through a sealing ring, a step hole for the ejector rod 40 to pass through is arranged at the center of each end cover 32, the end of the sleeve 33 is arranged in the step hole, the sleeve 33 and the ejector rod form a sealing fit through the sealing ring, the ejector rod 40 is inserted into the sleeve 33, a third spring 34 is arranged in a cavity between the sleeve 33 and the ejector rod 40, the third spring 34 is sleeved on the periphery of the ejector rod 40, one end of the third spring 34 abuts against an end plate 47 fixed to the end of the ejector rod 40, the other end of the third spring abuts against. The sleeve 33 is arranged to ensure that the buoy 30 does linear motion along the length direction of the mandril 40 and does not incline; considering that the liquid level valve controls the liquid level position to be adjustable, the float 30 and the push rod 40 are not fixedly connected, but the float 30 is connected along the push rod 40 by the elastic force of the third spring 34.

The valve core assembly 20 comprises a valve rod 21, the middle section of the valve rod 21 is hinged with the valve body 10 through a hinge shaft pin 22, the shaft core of the hinge shaft pin 22 is vertically arranged with a mandril 40, the positions on the valve rod 21 corresponding to the air inlet 11 and the air outlet 12 are respectively provided with an air inlet valve 23 and an air outlet valve 24, and when the float 30 moves up and down due to self weight or buoyancy, the valve rod 21 rotates around the hinge shaft to drive the air inlet valve 23 and the air outlet valve 24 to alternately open/close the air inlet and the. For the low liquid level valve, when the liquid level of the fuel in the oil tank 1 is lower than the set lowest liquid level, the buoy 30 pushes the valve core assembly 20 to act due to the self weight, the air inlet valve 23 closes the air inlet 11, the exhaust valve 24 opens the exhaust port 12, the exhaust port 12 is communicated with the working port 13, and compressed air is exhausted from the exhaust port 13, so that the oil filling bottom valve 2 is closed, and the oil pumping from the oil tank 1 is stopped; when the liquid level of the fuel in the oil tank 1 is higher than the set lowest liquid level, the buoyancy of the float 30 floats, the valve core assembly 20 acts, the air inlet 23 opens the air inlet 11, the exhaust valve 24 closes the exhaust port 12, at this time, the air inlet 11 is communicated with the working port 13, the compressed air enters from the air inlet 11 and goes out from the working port 13, and the bottom refueling valve 2 is opened for normal refueling operation. For the high liquid level valve, when the liquid level of the fuel in the oil tank 1 is lower than the set highest liquid level, the buoy 30 sinks due to self weight, the valve core assembly 20 acts, the air inlet valve 23 opens the air inlet 11, the exhaust valve 24 closes the exhaust port 12, the air inlet 11 is communicated with the working port 13, compressed air enters from the air inlet 11 and goes out from the working port 13, the oil bottom valve 5 is opened, and the oil tank 1 can carry out normal oil filling operation; when the liquid level of the oil in the oil tank 1 reaches the set highest liquid level, the buoy 30 floats upwards due to buoyancy, the valve core assembly 20 acts, the air inlet opening 11 is closed by the air inlet valve 23, the exhaust opening 12 is opened by the exhaust valve 24, the exhaust opening 12 is communicated with the working opening 13, compressed air is exhausted from the exhaust opening 12, the oil filling bottom valve 5 is closed, and the oil filling operation of the oil tank 1 is stopped.

As the preferred scheme of the utility model, be provided with first magnet 25 on the valve rod 21, the tip that is close to first magnet 25 one side on the ejector pin 40 is provided with second magnet 41, the adjacent side magnetic pole of first, second magnet 25, 41 is different, be provided with first spring 26 between valve rod 21 and the valve body 10, the buoyancy/gravity drive second magnet 41 of flotation pontoon 30 is close to first magnet 25, the magnetic force of first, second magnet 25, 41 overcomes the elasticity of first spring 26 and attracts, drive valve rod 21 rotates around articulated pivot 22 and drives intake valve 23 and close air inlet 11, exhaust valve 24 opens exhaust port 12 simultaneously, work port 13 communicates with each other with exhaust port 12; a second spring 42 is arranged between the valve body 10 and the push rod 40, the resultant force of the buoyancy of the float 30 and the second spring 42 overcomes the magnetic force of the first and second magnets 25, 41 or the gravity of the float 30 overcomes the magnetic force of the first and second magnets 25, 41 to drive the second magnet 41 to be far away from the first magnet 25, after the magnetic force of the first and second magnets 25, 41 is weakened or disappeared, the first spring 26 drives the valve rod 21 to rotate around the hinge shaft pin 22 to drive the intake valve 23 to open the intake port 11, meanwhile, the exhaust valve 24 closes the exhaust port 12, and the working port 13 is communicated with the intake port 11. In the low liquid level valve, as shown in fig. 10, the second magnet 41 is pressed down by the self weight of the float 30 to be close to the first magnet 25, when the distance between the first magnet 25 and the second magnet 41 reaches a certain short, the magnetic force of the first magnet 25 and the second magnet 41 is increased enough to overcome the elastic force of the first spring 26, the first magnet 25 and the second magnet 25 are attracted, and for the valve rod 21, the middle part is hinged with the valve body 10 through the hinge shaft pin 22, that is, the valve rod 21 is equivalent to a lever, according to the lever principle, the first magnet 25 at one end of the lever is attracted by the second magnet 41 to move upwards for a certain distance, so that the air inlet 11 at one end of the lever is closed by the air inlet valve 23, the exhaust valve 24 opens the exhaust port 12, and the working port 13 is communicated with the exhaust port; when the liquid level gradually rises, firstly, the combined force of the buoyancy of the float 30 and the second spring 42 overcomes the magnetic force between the first and second magnets 25, 41 to drive the second magnet 41 away from the first magnet 25, and after the magnetic force of the first and second magnets 25, 41 gradually disappears or weakens to a certain degree, the elastic force of the first spring 26 can drive the valve rod 21 to rotate around the hinge shaft pin 22, the first magnet 25 moves downwards under the action of the elastic force of the first spring 26, according to the lever principle, the air inlet 11 at one end of the lever can be opened by the air inlet valve 23, and the exhaust valve 24 closes the exhaust port 12, as shown in fig. 11. In the high level valve, as shown in fig. 13, when the fuel level of the oil tank 1 is lower than the set maximum level, the gravity of the float 30 overcomes the magnetic force between the first and second magnets 25, 41 to drive the second magnet 41 away from the first magnet 25, when the magnetic force of the first and second magnets 25, 41 gradually disappears or weakens to a certain extent, the first spring 26 drives the valve rod 21 to rotate around the hinge pin 22, the first magnet 25 moves upward under the elastic force of the first spring 26, and according to the lever principle, the intake port 11 at one end of the lever is opened by the intake valve 23, and the exhaust port 12 is closed by the exhaust valve 24; when the fuel level of the oil tank 1 reaches the set maximum level, the second magnet 41 is pushed to move upwards and approach the first magnet 25 by the buoyancy of the float 30, when the distance between the first magnet 25 and the second magnet 41 reaches a certain short time, the magnetic force of the first magnet 25 and the second magnet 41 is increased enough to overcome the elastic force of the first spring 26, the first magnet 25 and the second magnet 41 are attracted, the air inlet 11 is closed by the air inlet valve 23, and the exhaust valve 24 opens the exhaust port 12, as shown in fig. 12. It should be noted that in the high level valve, the gravity of the float 30 is enough to overcome the magnetic force between the first and second magnets 25, 41 and drive the second magnet 41 away from the first magnet 25, so that the second spring 42 is not needed; of course, in the low liquid level valve, if the buoyancy of the float 30 is large enough, the second spring 42 can be eliminated, but the buoyancy is increased, the axial size of the float 30 is also increased, so that the axial size of the whole liquid level control valve is increased, therefore, the second spring 42 is preferably arranged in the low liquid level valve, and the second spring 42 is eliminated in the high liquid level valve, so that the float 30 with high and low liquid levels can be designed to be the same, and the process is simplified.

As shown in fig. 9, the valve rod 21 is integrally in a strip plate shape, one end of the valve rod 21 is provided with a movable clamping hole 211 penetrating through a plate surface, the first magnet 25 is arranged in the clamping hole 211, and two movable end positions of the clamping hole 211 are fixedly connected through a bolt component 212, during assembly, the first magnet 25 is firstly placed in the movable clamping hole 211 and then locked by the bolt component 212, the valve rod 21 is further provided with a through hole 213, two sides of the through hole 213 are provided with pin holes 214, the hinge pin 22 is inserted from the pin holes 214 at two sides, the valve rod 21 at two sides of the through hole 213 is respectively provided with a toothed hole 215, a threaded sleeve 216 is fixed in the toothed hole 215, the intake valve 23 and the exhaust valve 24 are respectively arranged in the threaded sleeve 216 and form a fixed connection and are adjustable, and the intake valve 23. The valve rod 21 is made of non-metal materials, the influence of the valve rod 21 on the movement of the first magnet 25 and the second magnet 41 is avoided, the air inlet valve 23 and the air outlet valve 24 are respectively arranged on two sides of the hinge shaft pin 22, the movement directions of the two air valves are opposite all the time, and therefore the purpose that the air inlet valve 23 and the air outlet valve 24 alternately open/close the air inlet 11 and the air outlet 12 is achieved, wherein the air inlet valve 23 is arranged close to the first magnet 25, namely the air inlet valve 23 and the first magnet 25 are located on the same side of the hinge shaft pin 22, and when the first magnet 25 and the second magnet 41 are attracted, the air inlet valve 23 also moves to one side close to the.

In order to fix the hinge pin 22, a mounting seat 27 is fixed in the valve cavity 14, the mounting seat 27 is integrally in a U-shaped groove shape, the hinge pin 22 of the valve rod 21 is fixed on the groove walls of two sides of the mounting seat 27, and round holes are formed in the groove bottom at positions corresponding to the intake valve 23 and the exhaust valve 24.

Furthermore, the valve body 10 is provided with a process hole penetrating through the inside and the outside at a position corresponding to the first and the second magnets 25, 41, the process hole is internally provided with a guide sleeve 15, in order to not affect the attraction between the first and the second magnets 25, 41, the guide sleeve 15 is made of a material which does not affect the action of the first and the second magnets 25, 41, copper is preferably selected, the guide sleeve 15 is in sealing fit with the valve body 10, fuel outside the valve body 10 cannot enter the valve cavity 14 from between the guide sleeve 15 and the valve body 10, so as to ensure the normal work of the valve core assembly 20, the first magnet 25 protrudes to the outside of the valve rod 21, the first spring 26 is sleeved at the periphery of the first magnet 25, one end of the first spring 26 abuts against a step arranged on the surface of the valve rod 21, and the other end abuts against a step surface arranged on the outer wall of the. First spring 26's both ends respectively with the step on the valve rod 21 face, the step face on the uide bushing 15 outer wall supports and leans on, here first spring 26 is the pressure spring, pressure spring release elasticity drive valve rod 21 and uide bushing 15 have the trend of keeping away from each other, but because the position of uide bushing 15 is rigid, consequently valve rod 21 has the trend of keeping away from uide bushing 15 one side motion towards, overcome first magnet 25 then, the magnetic force of second magnet 42 makes both separation, establish first spring 26 cover in first magnet 25 periphery, the external force of overcoming first magnet 25 can be turned into to the at utmost to the elasticity of first spring 26 like this.

The whole guide sleeve 15 is barrel-shaped, the external thread arranged on the outer wall of the guide sleeve 15 and the internal thread on the inner wall of the fabrication hole form threaded connection, an external flange arranged at the opening of the barrel is attached to the outside of the valve body 10, a retainer ring 43 is arranged on the ejector rod 40 above the second magnet 41, the second spring 42 is sleeved on the periphery of the second magnet 41, one end of the second spring 42 is abutted to the external flange of the guide sleeve 15, and the other end of the second spring is abutted to the retainer ring 43. Because the periphery of the float 30 is filled with fuel, and the valve cavity 14 is not allowed to enter the fuel, the guide sleeve 15 is arranged here, the guide sleeve 15 is barrel-shaped, and because the barrel bottom is arranged and the guide sleeve 15 is in sealing fit with the valve body 10, the fuel cannot enter the valve cavity 14, thereby ensuring the normal use of the valve, and the first magnet 25 and the second magnet 41 can still be mutually attracted through the thin barrel bottom. Another important function of the guide sleeve 15 is: a fabrication hole is formed in the valve body 10, the first spring 26 is placed in the fabrication hole, then the guide sleeve 15 is used for positioning, and then the guide sleeve 15 can guide the movement of the second magnet 41 and the ejector rod 40, so that the effect of three functions is achieved. The ejector rod 40 is further provided with a second insertion hole 46 at a position adjacent to the retainer ring 43, a second spring clip 48 is inserted into the second insertion hole 46, and the second spring clip 48 abuts against the retainer ring 43 to limit the position of the retainer ring 43.

In order to protect the buoy 30, a protective cylinder cover 51 is arranged on the peripheries of the ejector rod 40 and the buoy 30, the inner diameter of the protective cylinder cover 51 is larger than the outer diameter of the buoy 30, a baffle 53 is arranged in the protective cylinder cover 51, the filter screen 52 of which is adjacent to the filter screen 52, is arranged at one end, away from the valve body 10, of the protective cylinder cover 51, and clamping blocks arranged on the periphery of the baffle 53 are in clamping fit with clamping grooves 511 arranged on the protective cylinder cover 51. In the low level valve, in order to prevent some impurities in the fuel from entering the protective cylinder cover 51, the filter net 52 is provided at the upper portion of the protective cylinder cover 51, and in the high level valve, it is not necessary to provide it. The baffle 53 has a certain elastic deformation amount, and can be conveniently inserted into the clamping groove 511, the baffle 53 can limit the stroke of the buoy 30, and an oil inlet 512 is formed in the position, adjacent to the connecting flange 60, on the protective cylinder cover 51.

In order to connect with the oil tank 1, a connecting flange 60 is arranged at the junction of the valve body 10 and the protective cylinder cover 51, and a plurality of mounting holes 61 are uniformly arranged on the disc surface of the connecting flange 60 along the circumferential direction at intervals. The valve body 10, the valve core assembly 20 and the connecting flange 60 are installed outside the oil tank 1 and then connected with an air source and other valve components, and the mandril 40, the buoy 30 and the protective cylinder cover 51 are positioned inside the oil tank 1.

In summary, compared to the low level valve, the high level valve omits the second spring 42, and the retainer 43, the second insertion hole 46 and the second spring clip 48 for limiting the position of the second spring 42, and the high level valve is mounted on the top of the oil tank 1, and impurities will sink due to gravity, so the high level valve does not need to be provided with the filter screen 52, and other structures are the same as the low level valve.

Claims (10)

1. The utility model provides a liquid level control valve, set up on valve body (10) with communicating air inlet (11) of valve pocket (14), gas vent (12) and working port (13), flotation pontoon (30) link to each other through ejector pin (40) and case subassembly (20) in valve pocket (14), when flotation pontoon (30) reciprocate because of dead weight or buoyancy, drive case subassembly (20) and open/close air inlet (11) and gas vent (12) in turn, its characterized in that: the floating barrel (30) comprises a barrel body (31), the ejector rod (40) is inserted into the barrel body (31), a third spring (34) is arranged in a cavity between the barrel body (31) and the ejector rod (40), the length direction of the third spring (34) is consistent with that of the ejector rod (40), the third spring (34) provides elastic force to limit the axial positions of the ejector rod (40) and the floating barrel (30), a plurality of first insertion holes (44) are uniformly arranged on the ejector rod (40) along the length direction at intervals, and a first spring clamp (45) is inserted into the first insertion holes (44) and abuts against the floating barrel (30) to limit the axial position of the floating barrel (30) and control the liquid level position height of the oil tank (1).

2. The liquid level control valve according to claim 1, wherein: a sleeve (33) is concentrically arranged at the center of the inner cavity of the cylinder body (31), end covers (32) are arranged at two ends of the cylinder body (31), the cylinder body (31) and the sleeve (33) are fixedly connected by the end covers (32), the outer wall of each end cover (32) forms a sealing fit with the inner wall of the cylinder body (31) through a sealing ring, a step hole for a mandril (40) to pass through is arranged at the center of each end cover (32), the end part of the sleeve (33) is arranged in the step hole and forms a sealing fit with the step hole through the sealing ring, the mandril (40) is inserted into the sleeve (33), a third spring (34) is arranged in a cavity between the sleeve (33) and the mandril (40), the third spring (34) is sleeved on the periphery of the mandril (40), and one end of the third spring (34) is abutted against an end, the other end of the spring abuts against the end cover (32), and the third spring (34) provides elastic force to limit the axial positions of the mandril (40) and the buoy (30).

3. The liquid level control valve according to claim 1, wherein: valve core subassembly (20) include valve rod (21), the middle section of valve rod (21) is articulated through articulated pivot pin (22) and valve body (10), the axle core and ejector pin (40) of articulated pivot pin (22) are arranged perpendicularly, on valve rod (21) with air inlet (11), gas vent (12) correspond the position department and are provided with intake valve (23) and exhaust valve (24) respectively, when flotation pontoon (30) reciprocated because of dead weight or buoyancy, valve rod (21) rotated around the articulated shaft and drives intake valve (23) and exhaust valve (24) and open/close air inlet (11) and gas vent (12) in turn.

4. The liquid level control valve according to claim 3, wherein: a first magnet (25) is arranged on the valve rod (21), a second magnet (41) is arranged at the end part of one side, adjacent to the first magnet (25), of the ejector rod (40), the magnetic poles of the adjacent sides of the first magnet (25) and the second magnet (41) are different, a first spring (26) is arranged between the valve rod (21) and the valve body (10), the second magnet (41) is driven to be close to the first magnet (25) by buoyancy/gravity of the buoy (30), the magnetic force of the first magnet (25) and the second magnet (41) overcomes the elastic force of the first spring (26) to attract, the valve rod (21) is driven to rotate around the hinged shaft pin (22) to drive the inlet valve (23) to close the air inlet (11), meanwhile, the exhaust valve (24) opens the exhaust port (12), and the working port (13) is communicated with; a second spring (42) is arranged between the valve body (10) and the ejector rod (40), the buoyancy of the buoy (30) and the resultant force of the second spring (42) overcome the magnetic force of the first and second magnets (25 and 41) or the gravity of the buoy (30) overcomes the magnetic force of the first and second magnets (25 and 41) to drive the second magnet (41) to be far away from the first magnet (25), after the magnetic force of the first and second magnets (25 and 41) is weakened or disappeared, the first spring (26) drives the valve rod (21) to rotate around the hinged shaft pin (22) to drive the air inlet (23) to open the air inlet (11), meanwhile, the exhaust valve (24) closes the exhaust port (12), and the working port (13) is communicated with the air inlet (11).

5. The liquid level control valve according to claim 4, wherein: valve rod (21) is whole to be the slat form, movable card hole (211) that link up the face are seted up to the one end of valve rod (21), first magnet (25) are arranged in card hole (211) and the both ends position department of activity of card hole (211) passes through bolt assembly (212) fixed connection, through-hole (213) have still been seted up on valve rod (21), pinhole (214) have been seted up to the both sides of through-hole (213), insert in pinhole (214) of articulated pivot (22) from both sides, respectively be provided with one tooth shape hole (215) on valve rod (21) of through-hole (213) both sides, tooth shape hole (215) internal fixation has swivel nut (216), swivel nut (216) are arranged respectively in to intake valve (23) and exhaust valve (24), intake valve (23) are close to first magnet (25) and arrange.

6. The liquid level control valve according to claim 3, wherein: a mounting seat (27) is fixed in the valve cavity (14), the mounting seat (27) is integrally in a U-shaped groove shape, hinge shaft pins (22) of a valve rod (21) are fixed on groove walls on two sides of the mounting seat (27), and round holes are formed in positions, corresponding to the intake valve (23) and the exhaust valve (24), on the groove bottom.

7. The liquid level control valve according to claim 5, wherein: with first on valve body (10), two magnet (25, 41) correspond position department and offer and link up inside and outside fabrication hole, be provided with uide bushing (15) in the fabrication hole, the external screw thread that the outer wall of uide bushing (15) set up constitutes threaded connection with the internal thread of fabrication hole inner wall, sealing fit between uide bushing (15) and valve body (10), first magnet (25) are protruding to valve rod (21) outside, first spring (26) cover is established in first magnet (25) periphery, the step that sets up on the one end of first spring (26) and valve rod (21) face supports and leans on, the other end supports and leans on the step face that sets up on uide bushing (15) outer wall.

8. The liquid level control valve according to claim 7, wherein: the whole barrel-shaped that is of uide bushing (15), bung hole department is provided with external turn-ups and pastes with valve body (10) outside and leans on, be provided with retaining ring (43) on ejector pin (40) of second magnet (41) top, second spring (42) cover is established in second magnet (41) periphery, the one end of second spring (42) leans on with the external turn-ups of uide bushing (15), the other end supports and leans on retaining ring (43), second jack (46) have still been seted up to neighbouring retaining ring (43) position department on ejector pin (40), second spring card (48) are inserted and are arranged in second jack (46), second spring card (48) and retaining ring (43) offset the position of restriction retaining ring (43).

9. The liquid level control valve according to claim 8, wherein: ejector pin (40) and flotation pontoon (30) periphery are equipped with protection barrel casing (51), the internal diameter of protection barrel casing (51) is greater than the external diameter of flotation pontoon (30), the one end that valve body (10) were kept away from in protection barrel casing (51) is provided with filter screen (52), be provided with baffle (53) in protection barrel casing (51) of neighbouring filter screen (52), the fixture block that baffle (53) periphery set up constitutes the joint cooperation with draw-in groove (511) of seting up on protection barrel casing (51), inlet port (512) have been seted up to neighbouring flange (60) position department on protection barrel casing (51).

10. The liquid level control valve according to claim 9, wherein: a connecting flange (60) is arranged at the junction of the valve body (10) and the protective cylinder cover (51), and a plurality of mounting holes (61) are uniformly arranged on the disc surface of the connecting flange (60) at intervals along the circumferential direction of the connecting flange.

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