CN210977707U

CN210977707U - Carbon tank desorption system

Info

Publication number: CN210977707U
Application number: CN201921135835.2U
Authority: CN
Inventors: 叶兆权; 张�林
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-07-10
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to a carbon tank desorption system, which comprises a carbon tank and a fuel tank, wherein the carbon tank is positioned in the fuel tank, one side of the fuel tank is provided with an exhaust pipe of an engine, and a heat shield is arranged between the exhaust pipe and the fuel tank; be provided with logical atmosphere mouth, absorption mouth and desorption mouth on the carbon tank, the inside active carbon that is provided with of carbon tank, lead to atmosphere mouth and pass through the filter tube and be connected with the outside filter that is located the fuel tank, absorption mouth intercommunication adsorption tube, desorption mouth is through desorption pipe and engine intercommunication, one of them section of desorption pipe is passed and is separated the heat exchanger and be located between heat exchanger and the blast pipe. The utility model discloses simple structure need not to increase the volume of active carbon, can reach the purpose of reinforcing desorption effect.

Description

Carbon tank desorption system

Technical Field

The utility model relates to a carbon tank desorption technical field, concretely relates to carbon tank desorption system.

Background

The canister is part of an automotive gasoline evaporation control system (EVAP) that is introduced to avoid fuel vapors escaping into the atmosphere after engine shut-down. The factors influencing the desorption of the carbon canister mainly include: desorption volume, activated carbon characteristics, desorption air temperature. When the engine can not provide enough desorption volume, a method of adding columnar carbon at the end of the carbon canister communicated with the atmosphere or adding activated carbon which can reduce fuel vapor overflow is generally adopted, but the scheme can obviously increase the cost of the carbon canister.

Existing carbon canisters are typically located near the fuel tank, away from the vent tube. Ash concerns are typically placed near the filler neck finish. The ash is considered to be far away from heat sources such as an exhaust pipe and the like, the air inlet temperature is low during desorption of the carbon tank, and the desorption effect of the carbon tank completely depends on the desorption volume. This requires that the canister control valve be opened long enough for the canister to desorb effectively when the engine is calibrated. However, the carbon canister control valve is opened for too long time, which can cause adverse effect on the exhaust emission of the engine, and the engine calibration is difficult, especially for a small-displacement engine or an HEV vehicle type. The carbon tank capable of improving the desorption air inlet temperature of the carbon tank needs to be researched, so that the desorption effect of the carbon tank does not depend on the desorption volume completely, and the sufficient desorption weight of the carbon tank can be achieved by realizing the smaller desorption volume.

CN103883435B discloses a carbon tank desorption heating device, the carbon tank desorption heating device makes the fuel molecule in the carbon tank can fully desorb when the carbon tank desorption on installing the carbon tank after to improve the activity of active carbon in the carbon tank, the life of extension carbon tank wherein, this carbon tank desorption heating device is including the heater that admits air that has air inlet and gas outlet, control valve and pipe joint, this pipe joint includes first interface, second interface and an atmosphere intercommunication mouth at least, wherein admit air the gas outlet of heater connect in the first valve interface of control valve, the second valve interface connection of this control valve in the first interface of pipe joint, the control valve can control for making first valve interface with second valve interface intercommunication or end.

For another example, CN202659377U discloses a temperature-adjustable automobile carbon canister, comprising: a carbon tank shell filled with active carbon; the lower part of the carbon tank shell is provided with a base; the carbon tank shell is respectively connected with an adsorption pipe, a desorption pipe and a vent pipe, and the surface of the carbon tank shell is provided with a temperature regulating device; the temperature adjusting device is a semiconductor chip arranged on the outer surface of the carbon tank shell; the semiconductor chip is a thermoelectric refrigerating chip; a heat dissipation shell is arranged on the surface of the semiconductor chip; and a temperature sensor is arranged in the carbon tank shell. The automobile carbon tank with adjustable temperature is characterized in that a semiconductor thermoelectric refrigerating sheet and a radiating shell are arranged on the outer surface of an automobile carbon tank shell; be provided with temperature sensor in the carbon tank casing, consequently the temperature of car carbon tank can be adjusted, has improved the absorption and desorption ability of carbon tank, reduces environmental pollution. None of the above is undoubtedly a beneficial attempt to improve canister shedding capacity.

Disclosure of Invention

The utility model aims at providing a carbon tank desorption system solves current carbon tank because the desorption volume is limited, leads to the insufficient technical problem of desorption.

A carbon tank desorption system comprises a carbon tank and a fuel tank, wherein the carbon tank is positioned in the fuel tank, an exhaust pipe of an engine is arranged on one side of the fuel tank, and a heat shield is arranged between the exhaust pipe and the fuel tank; be provided with logical atmosphere mouth, absorption mouth and desorption mouth on the carbon tank, the inside active carbon that is provided with of carbon tank, lead to atmosphere mouth and pass through the filter tube and be connected with the outside filter that is located the fuel tank, absorption mouth intercommunication adsorption tube, the desorption mouth is through desorption tube and the carbon tank control valve intercommunication on the engine, one of them section of desorption tube passes thermal shroud to be located between thermal shroud and the blast pipe.

Further, a section of the desorption pipe located outside the heat shield is arranged in parallel with the exhaust pipe.

Further, the ventilation port and the adsorption port are positioned on one side of the upper part of the carbon tank, and the desorption port is positioned on the other side of the upper part of the carbon tank.

Has the advantages that: the utility model discloses a blast pipe heats desorption pipe, need not to increase in addition that heating device just can reach the purpose of heating desorption pipe, makes in the intraductal air temperature of its desorption can reach 50-70 degrees reentrant carbon tank, higher than the experimental normal desorption temperature 38 ℃ of national standard, because of the heat absorption process of oil gas molecule when following the active carbon desorption, the air admission charcoal tank of the same volume, gas temperature is higher, and the desorption effect is better. By adopting the technical scheme, the desorption amount of the carbon tank can be increased under the condition of not changing the desorption calibration of the engine, the structure of the carbon tank does not need to be changed, the change of fuel evaporation system parts is small, and the cost is increased without adding columnar carbon. This practical novel simple structure, it is with low costs, directly utilize the blast pipe heating energy saving, also need not to increase the active carbon volume and can reach the purpose of reinforcing desorption effect.

Drawings

Fig. 1 is a schematic diagram of the mechanism of the present invention.

Fig. 2 is a schematic view of the structure of the canister.

In the figure: 1-carbon tank, 101-desorption port, 102-atmosphere port, 103-adsorption port and 104-active carbon;

2-fuel tank, 3-vent pipe, 4-engine, 5-heat shield, 6-adsorption pipe, 7-filter, 8-filter pipe, and 9-desorption pipe.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

as shown in fig. 1-2, the canister desorption system comprises a canister 1 and a fuel tank 2, wherein the canister 1 is located inside the fuel tank 2, a vent pipe 3 of an engine 4 is arranged on one side of the fuel tank 2, and a heat shield 5 is arranged between the vent pipe 3 and the fuel tank 2; be provided with on the carbon tank 1 and lead to atmosphere mouth 102, absorption mouth 103 and desorption mouth 101, the inside active carbon 104 that is provided with of carbon tank 1, lead to atmosphere mouth 102 and pass through filter tube 8 and be connected with the filter 7 that is located the 2 outsides of fuel tank, absorption mouth 103 intercommunication adsorption tube 6, adsorption tube 6 and batch oil tank (not drawn in the picture) intercommunication, fuel steam in the batch oil tank passes through in adsorption tube 6 gets into carbon tank 1, desorption mouth 101 is through desorption pipe 9 and the carbon tank control valve intercommunication on the engine 4, one of them section of desorption pipe 9 passes thermal-insulated cover 5 to be located between thermal-insulated cover 5 and the blast pipe 3. The temperature of the exhaust pipe 3 is very high, and when the desorption pipe 9 approaches the exhaust pipe 3, the temperature is increased by being heated by the exhaust pipe 3.

The utility model discloses an exhaust pipe 3 heats desorption pipe 9, makes in the air temperature in its desorption pipe 9 can reach 50-70 degrees reentrant carbon tank 1, and is higher than the experimental normal desorption temperature 38 ℃ of national standard, for the cooling process during carbon tank 1 desorption, the temperature of giving vent to anger when carbon tank 1 desorbs is less than 80 ℃, is far less than the maximum temperature limit value that carbon tank 1 casing and component part allow, therefore this kind of method can not cause the harm to carbon tank 1. Because the oil gas molecule is the heat absorption process when desorption from active carbon 104, the same volume of air gets into carbon canister 1, and gas temperature is higher, and the desorption effect is better. By adopting the technical scheme, the desorption amount of the carbon tank 1 can be increased under the condition of not changing the desorption calibration of the engine 4, the structure of the carbon tank 1 does not need to be changed, the change of fuel evaporation system parts is small, and the cost is increased without increasing columnar carbon.

Further, a section of the desorption pipe 9 located outside the heat shield 5 is arranged in parallel with the exhaust pipe 3. This increases the heated portion of the desorption tube 9, raising the heating temperature. When the desorption pipe is manufactured, the part of the desorption pipe 9 positioned outside the heat shield 5 is made of heat conduction materials, and the other part is made of heat insulation materials. This allows the desorption tube 9 to heat the air inside rapidly in the heated section, while the unheated section does not dissipate heat.

Further, the vent port 102 and the adsorption port 103 are located on one side of the upper portion of the canister 1, and the desorption port 101 is located on the other side of the upper portion of the canister 1. This maximizes both the adsorption and desorption volumes and provides for adequate mixing of air and fuel vapor.

Claims

1. A carbon tank desorption system comprises a carbon tank (1) and a fuel tank (2), wherein the carbon tank (1) is positioned in the fuel tank (2), an exhaust pipe (3) of an engine (4) is arranged on one side of the fuel tank (2), and a heat insulation cover (5) is arranged between the exhaust pipe (3) and the fuel tank (2); be provided with on carbon tank (1) and lead to atmosphere mouth (102), absorption mouth (103) and desorption mouth (101), carbon tank (1) inside is provided with active carbon (104), lead to atmosphere mouth (102) and be connected with filter (7) that are located fuel tank (2) outside through filter tube (8), absorption mouth (103) intercommunication adsorption tube (6), desorption mouth (101) are through desorption pipe (9) and the carbon tank control valve intercommunication on engine (4), its characterized in that, one section at desorption pipe (9) middle part passes thermal-insulated cover (5) to be located between thermal-insulated cover (5) and blast pipe (3).

2. The canister desorption system according to claim 1, wherein the desorption pipe (9) is arranged in parallel with the exhaust pipe (3) at a section located outside the heat shield (5).

3. The carbon tank desorption system according to claim 1, wherein the vent atmosphere port (102) and the adsorption port (103) are positioned on one side of the upper part of the carbon tank (1), and the desorption port (101) is positioned on the other side of the upper part of the carbon tank (1).