A low-leakage breather valve for an oil tank

Abstract

The application discloses an oil tank low-leakage breathing valve, which comprises a valve body, a valve cavity in the valve body being communicated with an oil tank, a liquid accumulation groove with an upward notch being formed in the top of the valve body, a through hole being formed in the top of the valve body, one end of the through hole penetrating the bottom of the liquid accumulation groove and the other end of the through hole being communicated with the valve cavity of the valve body, a sealing piece being arranged on the liquid accumulation groove and the through hole penetrating the sealing piece, an exhaust hole being formed in the sealing piece and being communicated with the through hole, a head valve being arranged in the liquid accumulation groove and the bottom of the head valve being closely attached to the sealing piece, a base being arranged at the bottom of the valve body, a plurality of inlets being arranged on the base, and a movable sealing assembly being arranged on the base and being movable up and down. When it is needed to prevent oil leakage, the through hole is sealed by using the floating and rubber sealing piece mode, the rubber sealing has better sealing performance, and when the pressure of the oil tank is reduced, the floating and sealing piece assembly mode can rapidly open the through hole, so that the internal pressure of the oil tank is better reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of automobile fuel system, and particularly relates to an oil tank low-leakage breather valve. BACKGROUND

[0002] Chinese patent CN103097163 discloses a valve for a fuel tank, the valve comprising a float chamber and a disc chamber in fluid communication through an intermediate flow passage; the float chamber is configured with a valve inlet in fluid communication with the fuel tank and a fluid inlet end into the intermediate flow passage, the disc chamber is configured with a valve outlet and a fluid outlet end from the intermediate flow passage, the fluid inlet end is sealable by a seal of a float member axially movable within the float chamber to selectively enable fluid to pass through the valve to or from the float chamber, and the fluid outlet end is sealable by a pressure retainer axially movable within the disc chamber to selectively enable fluid to pass into or out of the fluid outlet end. The pressure retainer is configured with a negative pressure vent valve movable between a sealed position, in which the negative pressure vent valve is sealed, and an open position, in which the negative pressure vent valve is open, thereby providing a fluid passage therethrough.

[0003] The valve for a fuel tank described above can solve the problem of pressure balance in the oil tank to some extent, but still has the following problems:

[0004] a. The inversion and dynamic sloshing leakage performance is poor, and there is a risk of oil quantity liquid;

[0005] b. After the valve is closed, the pressure in the valve gradually decreases, and as the pressure in the valve decreases, the valve reopening point is not high enough, and the oil tank internal pressure cannot be reduced in time. SUMMARY

[0006] The present application aims to overcome the deficiencies of the prior art and provide an oil tank low-leakage breather valve with simple structure, good sealing performance, and rapid pressure reduction and balance of the oil tank when the internal pressure of the vehicle is low.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: an oil tank low-leakage breather valve, comprising:

[0008] a valve body having a valve chamber in communication with an oil tank in the valve body, the top of the valve body having a groove opening upward to form a liquid accumulation groove; the top of the valve body further has a through hole, one end of the through hole penetrating through the bottom of the liquid accumulation groove, and the other end of the through hole communicating with the valve chamber of the valve body;

[0009] A sealing member is arranged on the sump, and the through hole penetrates the sealing member, and the sealing member is provided with an exhaust hole communicating with the through hole;

[0010] A head valve is arranged in the sump, and the bottom of the head valve is closely attached to the sealing member;

[0011] A base is arranged at the bottom of the valve body, and the base is provided with a plurality of inlets;

[0012] A movable sealing assembly is arranged on the base and can move up and down;

[0013] When the movable sealing assembly moves upward to seal the through hole, the movable sealing assembly seals the bottom of the through hole to prevent the oil tank from leaking; when the movable sealing assembly moves downward to separate from the through hole, the oil tank is depressurized.

[0014] Further, the movable sealing assembly comprises:

[0015] A float is arranged on the base and can move up and down by a compression spring;

[0016] A latch is arranged on the upper surface of the float;

[0017] A rubber sealing sheet is arranged on the top of the float by the latch;

[0018] When the float moves upward, the rubber sealing sheet seals the bottom of the through hole.

[0019] Further, an upper cover is further arranged on the top of the valve body, and the upper cover covers the sump.

[0020] Further, a metal lock ring is further arranged between the upper cover and the head valve.

[0021] Further, the sealing member is a hollow ring, and the sealing member is provided with an exhaust hole communicating with the through hole in the circumferential direction.

[0022] Due to the use of the above technical scheme, the present application has the following advantages compared with the prior art:

[0023] The oil tank low-leakage breathing valve of the present application can seal the through hole by using a float and a rubber sealing sheet when it is necessary to prevent oil from leaking outward, and the rubber sealing sheet has better sealing performance. When the pressure of the oil tank is reduced, the float and the sealing sheet can quickly open the through hole, thereby better reducing the internal pressure of the oil tank. The whole structure is simple, easy to operate, and has good popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0025] Appendix Figure 1 This is an exploded three-dimensional structural diagram of the present invention;

[0026] Appendix Figure 2 A three-dimensional structural diagram of the valve body;

[0027] Appendix Figure 3 This is the front view of the present invention;

[0028] Appendix Figure 4 For the appendix Figure 3 A partial sectional view of AA;

[0029] The components include: 1. Top cover; 2. Head valve; 3. Metal locking ring; 4. Valve body; 5. Pin; 6. Rubber sealing sheet; 7. Float; 8. Compression spring; 9. Base; 10. Sealing element; 40. Liquid accumulation groove; 42. Vent hole; 43. Lower sealing surface; and 44. Through hole. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not constitute a limitation thereof.

[0031] Please see the appendix Figures 1-4 An embodiment of the present invention provides a low-leakage breather valve for an oil tank, comprising a valve body 4, a seal 10, a head valve 2, a base 9, and a movable sealing assembly; the valve body 4 has a valve cavity communicating with the oil tank, and the top of the valve body 4 has a circular liquid accumulation groove 40 with the groove opening facing upward; the top of the valve body 4 also has a through hole 44, one end of the through hole 44 penetrating the bottom of the liquid accumulation groove 40, and the other end communicating with the valve cavity of the valve body 4, such that the lower end face of the through hole 44 constitutes a lower sealing surface 43.

[0032] The sealing element 10 is a hollow ring, and the sealing element 10 is disposed on the liquid accumulation tank 40; the through hole 44 penetrates the bottom of the liquid accumulation tank 40 and also penetrates the sealing element 10, and the sealing element 10 has an exhaust hole 42 in the circumferential direction that communicates with the through hole 44.

[0033] The head valve 2 is disposed in the liquid accumulation tank 40, and the bottom of the head valve 2 is tightly fitted with the sealing element 10. Thus, when the head valve 2 is precisely fitted with the sealing element 10, the air can only be vented through the vent hole 42 located on the valve body 4.

[0034] The base 9 is installed at the bottom of the valve body 4. The base 9 is provided with multiple inlets 90, and the oil tank communicates with the valve cavity of the valve body 4 through the inlets.

[0035] The movable sealing assembly is arranged on the base 9 and can move up and down; in particular, the movable sealing assembly comprises a float 7, a latch 5 and a rubber sealing sheet 6; the float 7 is arranged on the base 9 and can move up and down through a compression spring 8; the latch 5 is arranged on the upper surface of the float 7; the rubber sealing sheet 6 is arranged on the top of the float 7 through the latch 5; during operation, when the float 7 moves up, the rubber sealing sheet 6 moves up to seal the lower sealing surface 43 at the bottom of the through hole 44.

[0036] As a further preferred embodiment, an upper cover 1 is further arranged on the top of the valve body and covers the liquid collection groove 40; in addition, a metal lock ring 3 is further arranged between the upper cover 1 and the head valve 2, thereby improving the sealing between the head valve 2 and the upper cover 1.

[0037] During actual use, the low-leakage breathing valve is arranged at a high position on the top of the oil tank; in the normal state of the vehicle, the float 6 falls on the base 8, and the head valve 2 in the breathing valve falls on the sealing element 10 on the liquid collection groove, at this time, the oil tank can only be vented through the vent hole 42 on the valve body 4.

[0038] When the oil tank is jolted or the pressure in the oil tank suddenly increases due to other reasons, at this time, the head valve 2 is opened, the gas in the oil tank is quickly vented outward through the through hole 44 on the valve body 4 to reduce the pressure, thereby maintaining the pressure balance of the oil tank.

[0039] When the oil tank is jolted or the pressure in the oil tank suddenly increases due to other reasons, at this time, the head valve 2 is opened, the gas in the oil tank is quickly vented outward through the through hole 44 on the valve body 4 to reduce the pressure, thereby maintaining the pressure balance of the oil tank.

[0040] In addition, during normal refueling, the head valve 2 falls on the sealing element 10 on the valve body 4, at this time, only the vent hole 42 on the valve body 4 is used for venting, and when the oil limit valve reaches the rated volume, the oil limit valve is closed, at this time, the oil gun stops refueling, and the high pressure in the oil tank will open the head valve 2, at this time, the through hole 44 on the valve body 4 is used for quickly venting outward to reduce the pressure in the oil tank, thereby allowing the user to refuel again in a small amount.

[0041] The low-leakage breathing valve of the oil tank can seal the through hole by using the float and the rubber sealing sheet when it is necessary to prevent oil leakage, the rubber sealing sheet has better sealing performance, and when the pressure in the oil tank decreases, the float and the sealing sheet can quickly open the through hole, thereby better reducing the pressure in the oil tank; the whole structure is simple and convenient to operate, and has good popularization value.

[0042] The above are only specific application examples of the present application, and do not constitute any limitation on the protection scope of the present application. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the present application.

Claims

1. An oil tank low-leak breather valve characterized by, It comprises: a valve body with a valve cavity communicating with an oil tank, a top of the valve body having a sump with a notch upward, and the top of the valve body further having a through hole with one end penetrating the bottom of the sump and the other end communicating with the valve cavity of the valve body; a sealing element arranged on the sump, and the through hole penetrating the sealing element, the sealing element having a vent hole communicating with the through hole; a head valve arranged in the sump, and the bottom of the head valve closely adhering to the sealing element; a base arranged on the bottom of the valve body, the base having a plurality of inlets; a movable sealing assembly arranged on the base and movable up and down; wherein, when the movable sealing assembly moves upward to seal the through hole, the movable sealing assembly seals the bottom of the through hole to prevent the oil tank from leaking; and when the movable sealing assembly moves downward to separate from the through hole, the oil tank is depressurized. The movable sealing assembly comprises: a float arranged on the base and movable up and down by a compression spring; a latch arranged on the upper surface of the float; a rubber sealing sheet arranged on the top of the float by the latch; wherein, when the float moves upward, the rubber sealing sheet seals the bottom of the through hole; and the sealing element is a hollow ring with a vent hole communicating with the through hole in the circumferential direction.

2. The low-leakage breather valve for an oil tank according to claim 1, characterized by: Further comprising an upper cover clamped on the top of the valve body, and the upper cover covers the sump.

3. The low-leakage breather valve for an oil tank according to claim 2, characterized by: A metal lock ring is further arranged between the upper cover and the head valve.

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