WO2009111942A1

WO2009111942A1 - Canister-connecting structure for portable electric generating set

Info

Publication number: WO2009111942A1
Application number: PCT/CN2009/000184
Authority: WO
Inventors: 肖亨琳
Original assignee: 无锡开普动力有限公司
Priority date: 2008-03-14
Filing date: 2009-02-23
Publication date: 2009-09-17
Also published as: CN101245748A

Abstract

A canister-connecting structure for portable electric generating set is disclosed, which includes a fuel tank(1), a canister(2) for absorbing fuel vapor from the fuel tank, a bidirectional vapor-guiding pipe(3) connecting the inner space of fuel tank with the canister, and an intake conduct pipe(4) connecting the canister(2) with an intake system(5) of engine, the fuel tank(1) is provided in upper portion of one end of the electric generating set, an inlet(11) for filling fuel is formed on the upper portion of the fuel tank(1), and the height of the bidirectional vapor-guiding pipe(3) on a locating structure(61) is higher than the top plane of the inlet(11) by a height H.

Description

Carbon canister communication structure of portable generator set

Technical field

The invention relates to a carbon canister communication structure of a portable generator set, in particular to a communication structure used in a portable internal combustion generator set to establish a reliable connection between a carbon canister for adsorbing fuel vapor and a fuel tank, belonging to an internal combustion generator set Technical field of fuel volatile pollutant control.

Background technique

In order to maintain the normal pressure state in the fuel tank, the conventional internal combustion engine fuel tank is provided with a vent hole which is open to the atmosphere at the fuel filler port or the fuel tank cap, and the oil vapor formed by the evaporation of the fuel in the fuel tank is diffused into the atmosphere through the vent hole. , causing environmental pollution.

The patent document of US Patent Publication No. US 20050121004A1 discloses a General-Purpose Engine which uses a canister to absorb oil vapor evaporated in a fuel tank, and has a fuel vapor inside the fuel tank. To the gas pipe of the canister, a section of the pipe is disposed inside the oil tank, and the oil and gas inlet at the upper end of the pipe is placed under the top surface of the fuel tank of the fuel tank, and the lower end of the pipe extends outward from the casing of the lower portion of the oil tank. The technology also has the following deficiencies: the inflating duct guiding the oil vapor to the canister, the inlet end of which is located in the fuel tank filler port, in the vertical direction, the position is lower than the top surface of the fuel filler port, and The gas-filled pipe located in the fuel tank is arranged substantially perpendicular to the horizontal direction, which has the following hidden dangers. Once the oil is fully discharged to the full tank state, causing the oil level to exceed the height of the inlet of the gas-filled pipe, part of the fuel will pass through the gas. The inlet of the pipe flows into the gas-filled pipe and flows unimpeded to the canister under the action of gravity. Thus, part of the activated carbon adsorbent in the canister is submerged by the liquid fuel, thereby losing the adsorption capacity.

Summary of the invention

The object of the present invention is to overcome the above disadvantages, thereby providing a carbon canister communication structure of a portable generator set, which is compact in structure and reliable in use, and can effectively prevent fuel from flowing into the canister and improve the service life of the canister.

The main solution of the invention is achieved in this way:

The present invention includes a fuel tank, a canister for adsorbing oil vapor in the fuel tank, a double-guided gas pipe that communicates the interior of the fuel tank with the canister, and an intake conduit that connects the canister to the engine intake system The fuel tank is arranged at the upper part of one end of the generator set, and the fuel supply port is arranged above the fuel tank. The elevation of the double-guided air pipe at a specific positioning structure is higher than the top surface of the fuel tank filler port Above the distance H, H = l~50ran.

A part of the pipe section of the double-guided air pipe is disposed in the urging handle on the genset housing.

A positioning structure for maintaining the position of the double-guided air tube is provided in the handle.

An inner air guiding port and an outer air guiding port are respectively arranged inside and outside the fueling port, and the inner and outer air guiding ports are connected to each other.

A portion of the pipe section of the double-guided air pipe is pre-formed by a shaping process to have a shape that is adapted to the curved portion of the handle in the free state.

The canister is disposed on a frame member of a portable generator set.

The present invention has the following advantages over the prior art:

1. Place a part of the double-guided air pipe above the fueling port to ensure that no fuel will flow into the canister regardless of the state of refueling, ensuring that the canister can work under normal conditions and improve the use of the canister. life.

2. Clever use of the portable generator set to handle the handle higher than the fuel tank filler port, the highest passing point of the double-guided air pipe is arranged in the handle, which not only realizes the original intention of preventing the fuel from flowing into the canister, but also maintains the power generation. The appearance of the unit is not affected.

3. Since the double-guided air pipe is in the generator set, a part of the pipe that is hand-in-handed to the fuel filler port is shaped to have a curved shape adapted to the shape of the handle structure surrounding the same, and the holding pipe is provided in the hand-held raft. The positioning structure of the 髙 position, therefore, the vibration of the engine during operation and other unintentional pulling action will not loosen the double-guided air pipe that is sleeved on the outer air guiding port of the fueling port. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a carbon canister communication structure of the present invention.

2 is a schematic view showing the arrangement of the carbon canister communication structure of the present invention in a portable generator set.

Fig. 3 is an enlarged schematic cross-sectional view showing the arrangement of the double-guide air pipe of the carbon canister communication structure of the present invention in the fuel filler port portion and the generator set carrying handle.

Figure 4 is an enlarged view of the direction A in Figure 3 of the present invention.

Fig. 5 is a partially enlarged schematic view showing the B-B section of Fig. 3 of the present invention.

detailed description

The invention will be further described below in conjunction with the embodiments of the drawings:

As shown in Fig. 1 to Fig. 4, it mainly includes: fuel tank 1, fuel filler port 11, inner air inlet port 12, outer air guide port 13, carbon canister 2, atmospheric through hole 21, double guide air pipe 3, engine intake pipe 4, The engine intake system 5, with the handle 6, the positioning structure 61, 61a, 61b. As shown in FIG. 1 and FIG. 2, in the present invention, the fuel tank 1 is disposed at an upper portion of one end of the generator set, and the canister 2 is disposed on a genset frame member below the engine intake system 5 near the other end of the genset, the fuel filler port 11 is provided on the fuel tank 1.

a double-guided air pipe 3 having a certain flexibility, one end of which is airtightly fitted on the outer air guiding port 13 outside the fueling port 11, and the other end is airtightly fitted on the oil and gas inlet of the canister 2, and the outer air guiding port 13 is in communication with the inner air port 12 on the inner side of the fuel filler port 11 (see FIG. 3), such that the inner space of the fuel tank 1 is in communication with the canister 2; the engine intake duct 4 is between the canister 2 and the engine intake system 5 A communication relationship is established; the carbon can 2 is connected to the atmosphere outside it by the atmosphere through hole 21. The communication joints at both ends of the engine intake duct 4 are also airtight, ensuring that gases passing through the inside of the tube do not leak into the outside atmosphere.

As shown in Fig. 2, the section of the double-guided air pipe 3 from the turn B to the outer air port 13 of the oil tank 1 is shaped to have a curved shape adapted to the shape of the handle structure surrounding it.

As shown in FIG. 3, an inner air guiding port 12 is disposed near the top surface of the fuel filler port 11, and an outer air guiding port 13 communicating with the inner air guiding port 12 is disposed outside the fueling port 11, and one end of the double-guide air pipe 3 is airtight. The ground sleeve is connected to the outer air guiding port 13. The housing of the generator set is formed by combining two half-shells longitudinally divided by the handle 6 (not shown). In the handle 6 formed after the combination of the housings, a columnar positioning structure 61 is respectively provided in two The structure 61a and the structure 61b on the half-shell are nested and combined (see FIG. 5). The positioning structure 61 traverses the lower side of the double-guided air tube 3, and holds the partial tube section of the double-guided air tube 3 to keep it in the setting. The position at which the inner hole of the double-guided air pipe 3 is higher than the top surface of the fuel filler port 11 by a distance H, H = 10 mm in this embodiment.

4 is a partial enlarged view of the inside of the fuel filler port 11 as viewed in the direction indicated by the arrow A in FIG. 2, the view direction is opposite to the inner air guide port 12 of the fuel tank 1, and the opening direction of the inner air guide port 12 is displayed. In the horizontal direction. The reason why the horizontal opening direction is selected and the upward opening direction is discarded is to prevent the oil flow directly from entering the double-guided gas pipe 3 and flowing to the canister 2 during refueling.

The working principle of the invention:

On the one hand, when the internal pressure of the fuel tank is greater than the external ambient pressure, the mixed gas containing the oil vapor enters the double-guided gas pipe from the inlet of the oil and gas passage of the fuel filler port, and is guided into the carbon canister by the double-guided gas pipe, in the carbon canister, the mixed gas The oil vapor in the medium is adsorbed by the adsorbent and cannot escape. The air discharged into the atmosphere is clean air without oil vapor. This achieves the dual function of adsorbing oil vapor and balancing the pressure in the tank.

On the other hand, when the internal pressure of the fuel tank is less than the external ambient pressure, fresh air can be The vent hole on the canister that communicates with the atmosphere enters the canister and flows into the fuel tank through the double-guided air pipe. This achieves the effect of balancing the pressure in the tank.

On the other hand, when the engine is running, the engine intake duct that connects the canister to the engine intake system introduces some of the oil vapor in the canister into the engine cylinder for combustion, which improves fuel utilization.

In addition, when the internal pressure of the fuel tank is balanced with the external environmental pressure, the oil vapor will still be diffused into the canister through the double-guided gas pipe and adsorbed by the adsorbent.

In particular, it should be emphasized that the present invention places a part of the double-guided air pipe at a position higher than the top surface of the fuel filler port, thereby ensuring that the fuel in the fuel tank does not flow into the canister regardless of the state of refueling. The most prominent feature of the invention. .

Tests have shown that even if there is a situation in which the inlet of the oil spillway is blocked by the inlet of the oil and gas passage, the overflowing fuel can only be stored in the pipeline between the highest position of the double-guided gas pipe and the fuel filler port. Once the engine is running, with the fuel tank The oil supply to the engine causes the internal oil level to drop, and a negative pressure is gradually generated in the fuel tank, so that the fuel is re-inhaled into the fuel tank, and the double-guide gas pipe is reopened.

Claims

Rights request

1. A canister communication structure for a portable generator set comprising a fuel tank (1), a canister (2) for adsorbing oil vapor in the fuel tank, and a double-guided gas pipe connecting the internal space of the fuel tank to the canister (3), an intake duct that connects the canister (2) to the engine intake system (5)

(4) The fuel tank (1) is disposed at an upper portion of one end of the generator set, and the fuel filler port (11) is disposed above the fuel tank (1), characterized in that the double-guide gas pipe (3) is at the positioning structure (61) The elevation is higher than the top surface of the fuel filler port (11) by a distance 11.

A canister communication structure for a portable generator set according to claim 1, wherein said H = 1 to 50 mm.

A canister communication structure for a portable generator set according to claim 1, characterized in that a part of the pipe section of the double-guided gas pipe (3) is provided in the urging handle (6) of the genset housing.

The canister communication structure of a portable generator set according to claim 3, characterized in that the lifting handle (6) is provided with a positioning structure (61) for maintaining the position of the double-guided gas pipe (3).

The carbon canister communication structure of a portable generator set according to claim 1, wherein an inner air guiding port (12) and an outer air guiding port (13) are provided inside and outside the fueling port, respectively, inside and outside. The air ports (12, 13) are connected to each other.

The canister communication structure of a portable generator set according to claim 3 or 4, characterized in that part of the pipe section of the double-guided gas pipe (3) has a curved inner hand (6) in a free state Turn the part to fit the shape.

^ 7v A canister communication structure for a portable generator set according to claim 1, characterized in that the canister (2) is arranged on a frame member of a portable generator set.