CN205256004U - A evaporation pipeline for ORVR system - Google Patents

Abstract

A evaporation pipeline for ORVR system, include by the fuel tank insidely to the evaporating pipe of extending and setting up, evaporating pipe one end with be located add oil cut -off valve, oiling limit valve in the fuel tank link to each other respectively, the other end with lie in the outer carbon tank of fuel tank links to each other, the evaporating pipe is the undergauge structure with the one end that the carbon tank links to each other, and the pipe diameter is contracted to 6.5 mm of phi by 13.6 mm of phi, the intercommunication has the circulating pipe on the evaporating pipe, the circulating pipe with add oil pipe import lateral wall intercommunication, adding the oil pipe pipe diameter and being phi 25 -27 mm, its mouth of pipe department is provided with spacing seat. The utility model discloses comparing traditional vapourizer tube way, can improving effectively that fuel steam pressure distributes and flows in the fuel tank, greatly reduced refuels the diffusion of in -process fuel steam in to the atmosphere, and it is extravagant effectively to reduce the energy, reduces simultaneously to refuel the environmental pollution that the in -process led to the fact.

Description

For the evaporation pipeline of ORVR system

Technical field

The utility model relates to automotive fuel oil system technical field, especially relates to a kind of evaporation pipeline for ORVR system.

Background technology

The oil gas evaporation phenomenon that automobile produces in refueling process can cause serious disposal of pollutants and energy waste. According to statistics, often add the VOC gasoline boil-off gas that 1L gasoline just has about 1.5g and discharge from oil filler, often add the VOC boil-off gas that 50L gasoline just has 75g and discharge, the liquid gasoline that 75gVOC boil-off gas is equivalent to 100ml dissolves into the air. Adopt the vehicle oil gas recovery situation of ORVR system to be clearly better, but still there are the following problems for fuel tank evaporation pipeline: oil filling pipe can not reasonably recycle the steam producing in refueling process; The internal diameter of oil filling pipe is more much bigger than the internal diameter of discharge vaporization mouth, and oil filler do not seal, and therefore, in refueling process, only has small part VOC to enter canister, and major part is directly overflowed from oil filler; Current vehicle fuel adsorbent equipment (being generally canister) volume is (approximately 0.6 ~ 1L) less than normal generally, can not meet a large amount of fuel-steam adsorption functions; In addition, because the dimensions of evaporation pipeline can not form good mating with oil filling pipe, fuel tank internal duct, it is undesirable that the interior oil gas of fuel tank circulates situation.

Summary of the invention

The utility model provides a kind of evaporation pipeline for ORVR system, and object is to solve the larger problem of existing fuel tank VOC boil-off gas discharge capacity.

For achieving the above object, the utility model can be taked following technical proposals:

Evaporation pipeline for ORVR system described in the utility model, comprise by the inner outwards extended evaporation tube of putting of fuel tank, described evaporation tube one end be positioned at described fuel tank add oil cut-off valve, oiling limit valve is connected respectively, the other end is connected with the canister being positioned at outside described fuel tank, one end that described evaporation tube is connected with canister is undergauge structure, and caliber is reduced to φ 6.5mm by φ 13.6mm; On described evaporation tube, be communicated with circulation pipe, described circulation pipe is communicated with oil filling pipe import sidewall; Described oil filling pipe caliber is φ 25-27mm, and its mouth of pipe place is provided with limit base.

The volume of described canister is 2 liters, is provided with stop valve and sensor on it.

Described circulation pipe caliber is φ 6.35mm.

The evaporation pipeline for ORVR system that the utility model provides, compare traditional fuel evaporation pipeline, can effectively improve fuel-steam pressure distribution and mobile in fuel tank, greatly reduce refueling process intermediate fuel oil steam to the diffusion in atmosphere, effectively reduce energy waste, reduce the environmental pollution causing in refueling process simultaneously.

Brief description of the drawings

Fig. 1 is perspective view of the present utility model.

Fig. 2 is the structural representation of the utility model oil filling pipe.

Fig. 3 is the structural representation of I portion in Fig. 2.

Fig. 4 is that A in Fig. 3 is to structural representation.

Fig. 5 is that the utility model oil gas moves towards schematic diagram.

Detailed description of the invention

As shown in Figure 1, 2, evaporation pipeline for ORVR system described in the utility model, comprise by the inner outwards extended evaporation tube of putting 2 of fuel tank 1, evaporation tube 2 one end be positioned at fuel tank 1 add oil cut-off valve 3, oiling limit valve 4 is connected respectively, the other end is connected with the canister 5 being positioned at outside fuel tank 1. Particularly, in fuel tank 1 inside, two add oil cut-off valve 3 and link together by pipeline after, via being connected with evaporation tube 2 by sebific duct after a check valve, oiling limit valve 4 is also connected with evaporation tube 2 by sebific duct, thereby make evaporation tube 2, add oil cut-off valve 3, oiling limit valve 4 forms path, the fuel-steam in fuel tank 1 flows to canister 5 by evaporation tube 2.

For the formation of fuel tank internal pressure, the size of evaporation tube 2 plays vital effect, and the setting of its size directly has influence on height and the flow direction of the steam pressure in fuel tank 1. It is the stainless-steel pipe that 15mm, internal diameter are 13.6mm that evaporation tube 2 adopts external diameter, end adopts undergauge structure, internal diameter is reduced to 6.5mm by 13.6mm, then be connected with canister 5 by the sebific duct of FKM material, ensure the interior steam pressure reasonable layout of fuel tank 1 and the flow direction, effectively reduce the steam absorption load of canister 5 simultaneously. The volume of this canister 5 increases to 2 liters of left and right by 1 liter of traditional left and right, has greatly promoted oil gas absorbing usefulness; On canister 5, also increase in addition stop valve, breather valve sensor, can effectively control volatilization and the desorption of fuel-steam.

Be positioned at that on the evaporation tube 2 at oiling limit valve 4 places, to be communicated with external diameter be the circulation pipe 6 that φ 6.35mm, wall thickness are 0.7mm, circulation pipe 6 is communicated with oil filling pipe 7 import sidewalls; This oil filling pipe 7 is SPCF material, is spun into " it " font structure, and oil filler 7a(is installed as shown in Figure 3 by welding manner through special process in the shell of import department), effectively prevent fuel-steam effusion. According to gas station's nozzle dimensional parameters, pressure and flow regime in conjunction with refueling process intermediate fuel oil steam at fuel tank, fuel pipe, oil filling pipe 7 calibers are generally φ 25-27mm, in this example, external diameter is 27.1mm, internal diameter is 25.1mm, and limit base 8(is set as shown in Figure 4 in import department), avoid nozzle to insert oil filling pipe excessively dark, cause nozzle and oil filler gouging abrasion.

As shown in Figure 5, in the time that fuel tank 1 is refueled, the fuel-steam in case by adding oil cut-off valve 3, oiling limit valve 4 enters in evaporation tube 2, a part turns back in oil filling pipe 7 and re-uses through circulation pipe 6, another part is absorbed by canister 5. The utility model line seal is good, and inner oil gas circulates in order, has not only improved fuel oil and has added virtual value, and reduced the pollution of fuel-steam to environment.

Claims (3)

1. the evaporation pipeline for ORVR system, comprise by the inner outwards extended evaporation tube of putting (2) of fuel tank (1), described evaporation tube (2) one end be positioned at described fuel tank (1) add oil cut-off valve (3), oiling limit valve (4) is connected respectively, the other end canister (5) outer with being positioned at described fuel tank (1) is connected, it is characterized in that: one end that described evaporation tube (2) is connected with canister (5) is undergauge structure, and caliber is reduced to φ 6.5mm by φ 13.6mm; On described evaporation tube (2), be communicated with circulation pipe (6), described circulation pipe (6) is communicated with oil filling pipe (7) import sidewall; Described oil filling pipe (7) caliber is φ 25-27mm, and its mouth of pipe place is provided with limit base (8).

2. the evaporation pipeline for ORVR system according to claim 1, is characterized in that: the volume of described canister (5) is 2 liters, is provided with stop valve and sensor on it.

3. the evaporation pipeline for ORVR system according to claim 1, is characterized in that: described circulation pipe (6) caliber is φ 6.35mm.