CN201170147Y

CN201170147Y - Fuel leakage control valve

Info

Publication number: CN201170147Y
Application number: CNU2008200555202U
Authority: CN
Inventors: 黄莉玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-02-18
Filing date: 2008-02-18
Publication date: 2008-12-24
Anticipated expiration: 2018-02-18

Abstract

A fuel leakage control valve comprises a valve seat, and an obstruction membrane which is arranged in the valve seat with the capability of deforming concavely and convexly and is used for forming negative-pressure space and oil gas evaporation space through separation. The valve seat is provided with an air inlet communicated with the oil gas evaporation space, an air outlet communicated with the oil gas evaporation space, and a negative-pressure port communicated with the negative-pressure space. When the negative-pressure space forms a negative-pressure status or the oil gas evaporation space produces a preset oil gas evaporation pressure, the obstruction membrane enables the air inlet and outlet to be communicated; when the negative-pressure space does not form the negative-pressure status or the oil gas evaporation space does not produce the preset oil gas evaporation pressure, the obstruction membrane makes the air inlet and outlet not be communicated. The fuel leakage control valve can integrally reach the functions of balancing the air pressure in a fuel tank and inhibiting fuel leakage.

Description

The fuel leak control valve

Technical field

The utility model relates to a kind of fuel leak control valve, is meant that especially a kind of fuel tank that can suppress topples over the fuel leak control valve that causes the fuel leakage phenomenon because of external force or other factors.

Background technique

When generator operation, the fuel oil in the fuel tank can be by force feed to Carburetor, Carburetor can make fuel oil behind the air that mixes proper proportion again delivery go in the engine.

Yet, when generator operation, after being continued to detach, fuel oil can cause fuel tank to form vacuum, but when generator is flame-out, though fuel tank is fuel feeding not, but can cause its inner fuel oil volatilization because of being heated and produce oil gas, therefore, under the air pressure inside acute variation, produce the contraction or expansion distortion for fear of fuel tank, fuel tank can be communicated with the external world but not seal, usually, can exhaust port be set in the fuel tank cap place, allow fuel tank internal can drain vacuum (during fuel feeding) or disengage institute and accumulate oil gas when fuel feeding (not), to reach the purpose of trim tank inner and outer air pressure.On the other hand, when fuel tank was toppled over, above-mentioned valve member also can reach the function that prevents that fuel oil from leaking outside.

In recent years, along with environmental consciousness is surging, when shutting down in order to improve generator, oil gas in the fuel tank directly drains in the atmosphere, institute's environmental pollution that causes with problem such as be detrimental to health, the existing generator of current law need possess the relevant regulations of EECS Evaporative Emissions Control System, and wherein the most key with the activated carbon canister (Charcoal Canister) that is arranged between fuel tank and intake manifold.In simple terms, after generator shut down, the oil gas in the fuel tank can purify, be stored in the activated carbon canister (its bottom is that perforate is to communicate with ambient atmosphere); After generator starts, fuel tank can see through the atmosphere compensating effect of activated carbon canister and avoid forming vacuum because of fuel feeding, oil gas in the activated carbon canister just can mix with fresh air and be inhaled in the intake manifold, be fed in the engine again and burn, thus, just can make the effective recycling of oil gas, and save the fuel oil loss.

But, when the fuel oil overfill in the fuel tank, or in fuel tank is improper topples over (normally generator stop need not and due to arbitrarily placing) time, fuel oil then directly flows in the activated carbon canister easily, not only make the activated carbon canister deterioration and influence its purification efficiency, even the activated carbon canister contamination is stopped up, tank internal pressure can't be regulated and cause distortion eventually, and then cause generator to start.

The model utility content

The purpose of this utility model is to provide between the exhaust of oil mouth of a kind of threeway in a fuel tank, an activated carbon canister and an engine sourceof negative pressure, can be in order to adjusting the air pressure inside of fuel tank, and can effectively suppress fuel tank and topple over because of external force and cause the fuel leak control valve that fuel leakage is gone into the phenomenon of activated carbon canister.

Fuel leak control valve of the present utility model, be arranged on the exhaust of oil mouth of a fuel tank, and be communicated in an activated carbon canister and an engine sourceof negative pressure, this fuel leak control valve comprises the hollow valve seat that a seat is butted on the exhaust of oil mouth place of this fuel tank, and an obstruct diaphragm that is arranged in this valve seat.It is characterized in that: this valve seat has a negative pressure space, separated by this obstructing film sheet and not to communicate to be communicated in suction port, between this oil gas evaporation space and this exhaust of oil mouth in the oil gas evaporation space, of this negative pressure space and to be communicated in a air outlet between this oil gas evaporation space and this activated carbon canister and a negative pressure mouth that is communicated between this negative pressure space and this engine sourceof negative pressure; Whether but this obstruct diaphragm is a deformation of unevenness communicates with this air outlet to control this suction port.

Effect of the present utility model is, makes negative pressure space form negative pressure state in the engine start, or engine is static and fuel tank in accumulated capacity oil gas and when making the oil gas evaporation space produce predetermined oil gas evaporating pressure, the obstructing film sector-meeting allows this inlet, outlet communicate; Otherwise the obstructing film sector-meeting allows this inlet, outlet not communicate, can suppress to leak in the activated carbon canister outside the fuel oil when fuel tank is toppled over accidentally because of external force.

Description of drawings

Fig. 1 is a stereogram, and a preferred embodiment of fuel leak control valve of the present utility model is described, is between the exhaust of oil mouth and an activated carbon canister of the engine sourceof negative pressure that can threeway be arranged at a generator, a fuel tank;

Fig. 2 is a three-dimensional exploded view of this preferred embodiment;

Fig. 3 is an illustrative view, but illustrates that between this preferred embodiment, this fuel tank and this activated carbon canister be to be in aeration status;

Fig. 4 is an illustrative view, illustrates between this preferred embodiment, this fuel tank and this activated carbon canister it is that be in can not aeration status.

Embodiment

Below in conjunction with drawings and Examples the utility model is elaborated:

As shown in Figure 1, this preferred embodiment of fuel leak control valve 2 of the present utility model is applicable to a generator, and threeway is arranged between an exhaust of oil mouth 11, an activated carbon canister 5 and an engine sourceof negative pressure 3 (as Carburetor) of a fuel tank 1.Fuel feeding, oil gas evaporation controlling mechanism, start principle and structural design etc. that the fuel tank 1 of concerned power generation machine, engine sourceof negative pressure 3 and activated carbon canister are 5, usually know that by having in this technical field the knowledgeable is known, and non-feature of the present utility model place will not be described in detail in this.

As Fig. 2～shown in Figure 4, this fuel leak control valve 2 comprises a valve seat 21, of sitting the hollow at exhaust of oil mouth 11 places that are butted on this fuel tank 1 and is placed in an obstruct diaphragm 22 in this valve seat 21 and an elastic component 23 that is placed in this valve seat 21.

This valve seat 21 has one and is locked on this fuel tank 1 lip-deep diapire 211, one runs through the center portion of this diapire 211 and is communicated with the suction port 212 of the exhaust of oil mouth 11 of this fuel tank 1, one uprightly is arranged on the end face of this diapire 211 and its bottom is communicated with the open shape tube wall 213 of both-end of this suction port 212, one extends upward from these diapire 211 surfaces and at interval around the perisporium 214 of this tube wall 213, one runs through this perisporium 214 and is communicated with the air outlet 215 of this activated carbon canister 5, these perisporium 214 apical margins of one closed butt joint and its top center are brought cover wall 216 in a tubular form together, and one runs through the tubular top of this cover wall 216 and is communicated with the negative pressure mouth 217 of this engine sourceof negative pressure 3.Wherein, this negative pressure mouth 217 is not communicate in this suction port 212, does not also communicate in this air outlet 215.

The periphery of this obstruct diaphragm 22 is closely to be located in the perisporium 214 of this valve seat 21 and engaging between the place of cover wall 216, and the inner space of this valve seat 21 is separated a negative pressure space 218 and an oil gas evaporation space 219 that is not connected up and down, so, this negative pressure mouth 217 is to be communicated in 218 of this engine sourceof negative pressure 3 and this negative pressure space, this suction port 212 is to be communicated in 219 in this exhaust of oil mouth 11 and this oil gas evaporation space, and this air outlet 215 then is communicated in 5 of this oil gas evaporation space 219 and this activated carbon canisters.In addition, the center portion of this obstruct diaphragm 22 is the top face places corresponding to the tube wall 213 of this valve seat 21, and can produce protuberantia with this oil gas evaporation space 219 variation in pressure between the two with the negative pressure space 218 of this valve seat 21 or deformation such as sink.

When the center portion of this obstruct diaphragm 22 is sucked or pushes against and the protuberantia that makes progress, and (see figure 3) during away from the end face of this tube wall 213, can be connected between the exhaust of oil mouth 11 of this fuel tank 1, this suction port 212, these tube wall 213 inside, this air outlet 215 and these activated carbon canister 5 inside.And when the center portion of this obstruct diaphragm 22 sink and sit support, (see figure 4) when retaining blocks up in the end face place of this tube wall 213,212 of this suction ports can't be connected with this air outlet 215, and just the exhaust of oil mouth 11 of this fuel tank 1 does not communicate in these activated carbon canister 5 inside.

This elastic component 23 is pressure springs, and its top and bottom ends is the center portion end face that links these cover wall 216 inner faces and this obstruct diaphragm 22 respectively.When the center portion of this obstruct diaphragm 22 makes progress protuberantia because of being sucked or pushing against, can force this elastic component 23 to be compressive state; And making progress the suction of protuberantia or thrust when disappearing when the center portion that forces this obstruct diaphragm 22, the elastic force of this elastic component 23 can push away just that the center portion that makes this obstructs diaphragm 22 is sagging to be resetted.

Therefore, when this generator operation, this engine sourceof negative pressure 3 can make the negative pressure space 218 of this valve seat 21 form negative pressure state, thereby upwards swell in the center portion of aspirating this obstruct diaphragm 22, and make this elastic component 23 be compressive state, at this moment, but the exhaust of oil mouth 11 of this fuel tank 1, this valve seat 21 inner with these activated carbon canister 5 inside be to be in aeration status.So this fuel tank 1 carries out fuel feeding and oil generation is consuming time, see through the atmosphere compensating effect of activated carbon canister 5, this fuel tank 1 just can avoid causing problems such as contraction deformation or fuel feeding are obstructed because of producing vacuum.

And when this generator shuts down, this engine sourceof negative pressure 3 negative-pressure sucking of giving birth to just disappears, the elastic force of this elastic component 23 can force automatic the sinking in the center portion of this obstruct diaphragm 22 to reset, and sit securely and support, retaining blocks up on tube wall 213 end faces of this valve seat 21, path with 215 of the suction port 212 of blocking this valve seat 21 and air outlets, allow 5 of this fuel tank 1 and this activated carbon canisters promptly be not communicating state, in order to, even if this generator is noted to the greatest extent or when causing this fuel tank 1 to topple over accidentally because of other external force because of putting, the fuel oil that just can effectively suppress in this fuel tank 1 leaks, flow in this activated carbon canister 5, guarantee the normal performance of these activated carbon canister 5 usefulness, it is smooth and easy to allow this generating function reach running, functions such as oil consumption saving and exhaust gas purification.On the other hand, the oil and gas content of accumulating up to this fuel tank 1 inside reaches certain value, and the oil gas evaporation space 219 of this valve seat 21 produces one during greater than the predetermined oil gas evaporating pressure of the elastic force of this elastic component 23, the center portion of this obstruct diaphragm 22 beginning can upwards be pushed against and away from tube wall 213 end faces of this valve seat 21, make the exhaust of oil mouth 11 of this fuel tank 1, but these valve seat 21 inside and these activated carbon canister 5 inside etc. are to be in aeration status, at this moment, oil gas in this fuel tank 1 just can be discharged and stimulate the menstrual flow these valve seat 21 inside and be adsorbed, be stored in this activated carbon canister 5, can be recovered into burning utilization again in its engine when starting for this generator.

Conclude above-mentioned, fuel leak control valve 2 of the present utility model, in the engine start or engine is static and fuel tank 1 in when having accumulated capacity oil gas, these obstruct diaphragm 22 meeting protuberances are out of shape and allow this inlet, outlet 212,215 communicate, and drain fuel tank 1 internal high pressure and adsorb the oil gas of being discharged from fuel tank 1 can see through activated carbon canister 5; And when not accumulating capacity oil gas as yet in the static and fuel tank 1 when engine, this obstruct diaphragm 22 is understood depressed deformations and is allowed this inlet, outlet 212,215 not communicate, leak in the activated carbon canister 5 to topple over accidentally in fuel tank 1 outside the Shi Nengfang system fuel oil, so can reach effect of the present utility model really.

Claims

1. fuel leak control valve, be arranged on the exhaust of oil mouth of a fuel tank, and being communicated in an activated carbon canister and an engine sourceof negative pressure, this fuel leak control valve comprises the hollow valve seat that a seat is butted on the exhaust of oil mouth place of this fuel tank, and an obstruct diaphragm that is arranged in this valve seat; It is characterized in that:

This valve seat has a negative pressure space, separated by this obstructing film sheet and not to communicate to be communicated in suction port, between this oil gas evaporation space and this exhaust of oil mouth in the oil gas evaporation space, of this negative pressure space and to be communicated in a air outlet between this oil gas evaporation space and this activated carbon canister and a negative pressure mouth that is communicated between this negative pressure space and this engine sourceof negative pressure; Whether but this obstruct diaphragm is a deformation of unevenness communicates with this air outlet to control this suction port.

2. fuel leak control valve according to claim 1 is characterized in that: also comprise one and be placed in the negative pressure space of this valve seat and its opposite end links the elastic component of this valve seat inner face and this obstruct diaphragm respectively.

3. as fuel leak control valve as described in the claim 2, it is characterized in that: this valve seat also has a diapire that is locked on this tank surface, one extends upward the perisporium of setting from this bottom wall surface, one uprightly is arranged on this bottom wall surface and the tube wall that centered at interval by this perisporium, and the cover wall of this perisporium apical margin of closed butt joint, this suction port is to run through this diapire and be connected with this tube wall inside, this air outlet is to run through this perisporium, this negative pressure mouth is to run through this cover wall, this obstruct diaphragm periphery is to be located in the engaging between the place of this perisporium and this cover wall, and its center portion is can sit to this tube wall end face, this obstruct diaphragm is to cooperate to define this negative pressure space with this cover wall, this intercepts diaphragm, this diapire is to cooperate to define this oil gas evaporation space, the top of this elastic component with this perisporium, the bottom is to connect this cover wall and this obstruct diaphragm respectively.