CN2238758Y - Fuel tank cap - Google Patents

Abstract

A fuel tank cap comprises a cylinder body plugged at a filler neck of a fuel tank, an outer cap sleeved at the front end of the cylinder body and used for holding and applying force, a leak-proof O-shaped ring, a bottom cap sleeved at the rear end of the cylinder body, a gas throttling disc, a positive pressure adjusting assembly and a negative pressure adjusting assembly; the fuel tank cover is fixed at the fuel filler pipe opening of the fuel tank, when the pressure in the fuel tank is too high, the positive pressure adjusting assembly moves, a part of gas in the fuel tank can be discharged, and when the pressure in the fuel tank is too low, the negative pressure adjusting assembly moves, so that gas outside the fuel tank can enter, and the gas pressure of the fuel tank is balanced.

Description

Fuel tank cap

The utility model relates to a fuel tank cover, in particular to a fuel tank cover which can adjust and balance the gas pressure of the fuel tank.

Generally known fuel tank caps only have the function of locking the filling nozzle of the fuel tank, and a vent hole is left on the surface of the fuel tank to avoid deformation of the fuel tank due to pressure changes. , will cause the oil and gas to escape from the exhaust hole continuously due to evaporation. In addition to causing meaningless evaporation and waste of oil products, it will also cause air pollution in the external environment; Oil can escape from the fuel cap vent, increasing the risk of fire. Therefore, the fuel tank cap of the conventional fuel tank filling nozzle is difficult to meet the requirements of modern environmental protection and safety, and there are many shortcomings to be further improved.

In view of this, the purpose of this utility model is to provide a fuel tank cap, which can effectively close the filling nozzle of the fuel tank, and can automatically adjust the gas pressure in the fuel tank when necessary; that is, when the gas pressure in the fuel tank is maintained at When within a limited range, the fuel tank cover is sealed. When the gas pressure in the fuel tank is too high, a part of the gas in the fuel tank can be discharged. When the pressure in the fuel tank is too low, the gas outside the fuel tank can enter, which can effectively Closed fuel tank filling nozzle, and can automatically adjust and balance the gas pressure in the fuel tank when necessary.

In order to achieve the above purpose, the fuel tank cap provided by the utility model includes: a cylindrical body, plugged in a fuel tank nozzle, which has a protruding ring and a partition, the partition has a middle hole; an outer cover, It is socketed on the front end of the cylinder body, which can be used for gripping and applying force; a leak-proof O-ring is socketed on an outer side of the cylinder body; a bottom cover is socketed on the back of the cylinder body End; a gas throttling disc, placed in the cylinder body, the gas throttling disc has a middle hole and at least one (can be one, two, three, four or more) ventilation side holes, And protrudingly provided with an intermediate ventilation tube to surround the intermediate hole; a positive pressure adjustment assembly, placed between the partition plate in the cylinder body and the gas throttling disc, the positive pressure adjustment assembly is composed of a conical spring, It is composed of a V-shaped valve and a guide head; a negative pressure adjustment assembly is placed between the gas throttling disc and the bottom cover in the cylinder body, and the negative pressure adjustment assembly is composed of a diaphragm valve, a circular It consists of a disc and a spring.

The V-shaped valve of the positive pressure adjustment assembly is placed at the nozzle of the middle ventilation pipe of the gas throttling disc, and the V-shaped valve is blocked by the elastic force of the conical spring and the guidance of the guide head. The nozzle of the middle ventilation pipe of the throttling disc.

The diaphragm valve of the negative pressure regulating component is in contact with a bottom surface of the gas throttling disc, and the diaphragm valve seals the ventilation side hole of the gas throttling disc by the pressure of the circular disc and the elastic force of the spring .

Therefore, when the fuel tank cap is fixed on the fuel filler nozzle of the fuel tank, when the pressure in the fuel tank is too high, the positive pressure regulating assembly will act to discharge a part of the gas in the fuel tank; when the pressure in the fuel tank is too low, the negative pressure regulating assembly will The action allows the gas outside the fuel tank to enter, thereby balancing the gas pressure in the fuel tank.

In addition, the inner edge of the front end of the cylinder body has an inner ratchet, and the outer cover has an outer ratchet. The inner ratchet on the inner edge of the front end of the cylinder body cooperates with the outer ratchet of the outer cover to form a ratchet device. When the cap is tightened to a certain degree, the ratchet device takes effect and performs idling, which can prevent the fuel tank cap from being locked on the fuel filler nozzle of the fuel tank.

It can be seen that the fuel tank cap of the present utility model can effectively seal the fuel tank, and can automatically adjust the gas pressure in the fuel tank when necessary, and is suitable as a cover for general gasoline (or similar volatile fuel or solvent) tanks, and is also suitable as a Fuel tank caps for motorcycles, cars or other vehicles.

For ease of description, the utility model can be better understood from the following preferred embodiments and accompanying drawings.

Fig. 1 is an exploded schematic view of a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the gas in the fuel tank diffused to the outside world (outside the fuel tank) through the utility model when the pressure in the fuel tank is too high.

Fig. 3 is a schematic diagram of the gas from the outside (outside the fuel tank) entering the fuel tank through the utility model when the pressure in the fuel tank is too low.

Fig. 4 is a schematic diagram of a preferred embodiment of the present invention installed at the filling nozzle of an automobile fuel tank.

Please refer to Fig. 1, the fuel tank cap 1 of the present utility model has a cylindrical body 2, a convex ring 21 and a partition 22 integrally formed with plastic, the partition 22 is a circular plate with a middle hole 23, and the partition 22 A number of fixed arms 24 are fixed on the inner wall of the cylinder body 2; an outer cover 3 is sleeved on the front end of the cylinder body 2, which can be used for gripping and applying force; an anti-leakage O-ring 4 is sleeved on the The outer side of the cylinder body 2 is used as a leak-proof gasket between the protruding ring 21 and the filling nozzle of the fuel tank; a bottom cover 5 is engaged with the inner edge of the rear end of the cylinder body 2; a gas throttling disc 6 is placed Inside the cylinder body 2, it has a central round hole 61 and four ventilating side holes 62, and a central ventilating tube 63 protrudingly surrounds the central round hole 61; a positive pressure regulating assembly 7 is placed on the cylindrical body 2 Between the inner partition 22 and the gas throttling disk 6, it is composed of a conical spring 71, a V-shaped valve 72 and a guide head 73; a negative pressure adjustment assembly 8 is placed in the cylinder body 2 Between the gas throttling disc 6 and the bottom cover 5, it is composed of a diaphragm valve 81, a circular disc 82 and a spring 83.

The V-shaped valve 72 of the positive pressure regulating assembly 7 is placed at the nozzle of the middle ventilation pipe 63 of the gas throttling disk 6, and the front end of the V-shaped valve 72 is equipped with a conical spring 71, which is driven by the thrust of the conical spring 71. The V-shaped valve 72 tops the nozzle of the middle ventilation pipe 63 of the gas throttling disc 6, and a guide head 73 is placed at the rear end of the V-shaped valve 72, which can assist the guide V-shaped valve 72 to avoid Skew in action.

The diaphragm valve 81 of the negative pressure regulating assembly 8 is in contact with the bottom surface of the gas throttling disc 6 to close the four ventilation side holes 62; it is pushed against the circular disc 82 by the thrust of the spring 83, and the circular disc 82 compresses the diaphragm valve 81, and the diaphragm valve 81 can seal the four ventilation side holes 62 of the gas throttling disc 6 reliably.

Please refer to Fig. 2 and Fig. 4, when the fuel tank cap 1 is fixed on the oil tank filling nozzle, when the pressure in the fuel tank is too large (greater than the sum of the external atmospheric pressure and the thrust of the conical spring 71), the normal The pressure regulating assembly 7 operates, that is, the gas in the fuel tank passes through the middle hole 52 of the bottom cover 5 (or the side hole 51 of the bottom cover 5), the middle hole 821 of the circular disc 82, and the middle hole of the diaphragm valve 81. 811. The middle circular hole 61 of the gas throttling disk 6, and the V-shaped valve 72 is slightly pushed away from the mouth of the middle ventilation pipe 63 to form a gap, so that the gas in the fuel tank is passed between the V-shaped valve 72 and the middle ventilation circle. The gap between the nozzles of the tube 63 escapes, and then diffuses to the outside world (outside the fuel tank).

Please refer to Fig. 3 and Fig. 4, when the pressure in the fuel tank is too small (the sum of the pressure in the fuel tank and the thrust of the spring 83 is less than the external atmospheric pressure), the negative pressure regulating assembly 8 will act, and the external air will pass through the gas The four ventilation side holes 62 of the throttling disc 6 push the diaphragm valve 81 slightly away from the bottom surface of the gas throttling disc 6 to form a gap through which the outside air enters, and then passes through the middle circle of the bottom cover 5 The hole 52 (or the side hole 51 of the bottom cover 5) enters the oil tank.

When the pressure in the fuel tank is not too large (not greater than the sum of the external atmospheric pressure and the thrust of the conical spring 71) and not too small (the sum of the pressure in the fuel tank plus the thrust of the spring 83 is not less than the external atmospheric pressure), positive The pressure regulating assembly 7 and the negative pressure regulating assembly 8 all do not act, the gas in the fuel tank does not escape outside the fuel tank, and the outside air does not enter in the fuel tank either, and now the fuel tank cover 1 seals the fuel tank.

Please refer to Fig. 1 again, in order to prevent the fuel tank cap 1 from being locked at the filling nozzle of the fuel tank, the inner edge of the front end of the cylinder body 2 has an inner ratchet 25, and the outer cover 3 has an outer ratchet 31, and the front end of the cylinder body 2 The inner ratchet 25 on the inner edge cooperates with the outer ratchet 31 of the outer cover to form a ratchet device. Therefore, when the outer cover 3 is tightened to a certain extent, the ratchet device takes effect and idles, which can prevent the fuel tank cap 1 from being locked. Fuel tank fill nozzle.

What is disclosed above is only a kind of preferred embodiment of the present utility model, and all the local changes or modifications that are easily deduced by people familiar with the art from the technical idea of the present utility model do not depart from the utility model. New patent scope.

To sum up, the utility model is different from the known technical features in terms of purpose, means and efficacy, and its first creation is also progressive and can be used by industries.

Claims (5)

1. A fuel tank cap, which is fixed at the filling nozzle of the fuel tank, is characterized in that it includes: A cylindrical body, which is plugged into the filling nozzle of the fuel tank, has a protruding ring and a partition, and the partition has a middle hole; an outer cover, which is sleeved on the front end of the cylinder body; A leak-proof O-ring, which is sleeved on the outside of the cylinder body; a bottom cover, which is sleeved on the rear end of the cylindrical body; A gas throttling disc, which is placed in the cylinder body, has a central circular hole and at least one ventilation side hole, and is protrudingly provided with a central ventilation tube surrounding the central circular hole; A positive pressure adjustment assembly, which is placed between the partition plate in the cylinder body and the gas throttle disc, which is composed of a conical spring, a V-shaped valve and a guide head; When large, the positive pressure regulating component is in the conduction position; A negative pressure regulating assembly, which is placed between the gas throttling disc and the bottom cover in the cylinder body, consists of a diaphragm valve, a circular disc and a spring; when the pressure in the fuel tank is too small, The negative pressure regulating component is in the conduction position. 2. The fuel tank cap according to claim 1, characterized in that: the V-shaped valve of the positive pressure regulating assembly is placed at the nozzle of the middle ventilation pipe of the gas throttling disc, and is controlled by the elastic force of the conical spring. With the guidance of the guide head, the plug is plugged in the middle ventilating tube opening of the gas throttling disk. 3. The fuel tank cap according to claim 1, characterized in that: the diaphragm valve of the negative pressure regulating assembly is in contact with the bottom surface of the gas throttling disc, and is sealed by the pressure of the circular disc and the elastic force of the spring. Vent side hole of the gas throttle disc. 4. The fuel tank cap according to claim 1, characterized in that: the front end of the cylinder body has an inner ratchet, the outer cover has an outer ratchet, and the inner ratchet at the front end of the cylinder body is in contact with the outer ratchet of the outer cover. Cooperate to become a ratchet device. 5. The fuel tank cap as claimed in claim 1, characterized in that: the gas throttling disk has four ventilation side holes.

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