CN218030387U - Non-road mobile machine - Google Patents

Abstract

The utility model discloses a non-road removes machinery, including fuel storage device, fuel feeding device, vapor adsorption device and engine body, vapor adsorption device is provided with the blow vent with the atmosphere intercommunication, fuel storage device's steam vent and vapor adsorption device's absorption mouth intercommunication, still including connect in valve mechanism between vapor adsorption device's desorption mouth and the inlet channel of engine body, valve mechanism is for switching on along with the work operation of engine body, along with the valve mechanism of the work stop of engine body and separation. The scheme solves the problem that the evaporative emission of the non-road mobile machinery in the prior art is easy to exceed the standard.

Description

Non-road mobile machine

Technical Field

The utility model relates to a to adding the combustion engine of the fuel steam of discharging from the fuel tank in the burning gas mixture, specifically be a non-road mobile machinery.

Background

Non-road mobile machines refer to machines operating on non-public roads for the purpose of distinguishing them from engines used on road vehicles in order to facilitate the establishment of corresponding emission standards. The components of the off-road mobile machine include an engine body that generates mechanical energy by combustion of fuel, a fuel storage device for storing fuel, an air filter device for filtering air for combustion, and a fuel supply device for supplying fuel into an intake passage of the engine body.

The pollutant emission sources of non-road mobile machinery are mainly tail gas emission and fuel evaporative emission. The means for reducing fuel evaporation emission of non-road mobile machinery in the prior art mainly adopts a physical adsorption mode to communicate a vapor discharge port of a fuel storage device with a vapor adsorption device, fuel vapor emitted by the fuel storage device is adsorbed by utilizing an adsorption material in the vapor adsorption device, the vapor adsorption device is generally a tank body with activated carbon stored inside, the activated carbon is utilized to adsorb the fuel vapor, and then the vapor adsorption device is communicated with an air filtering device, so that the purpose of reducing the fuel evaporation emission is achieved.

For example, a vaporization control system for a generator set disclosed in chinese patent document CN211819730U includes an oil tank, a working unit, an air filter, and a carbon canister storing activated carbon, where the oil tank is communicated with a vapor adsorption device, and the carbon canister is communicated with the air filter through a vent pipe. During the use, the fuel vapour of evaporation enters into the carbon tank in the oil tank and is adsorbed, and when the work cell during operation, empty filter produced the negative pressure to make the desorption of adsorbed fuel vapour in the carbon tank and enter into the work cell through the breather pipe and burn, reduced the evaporation emission of fuel, simultaneously, the carbon tank can adsorb fuel vapour again after desorption, avoided the carbon tank to reach and adsorb saturated condition and became invalid.

In actual use, it was found that the existing means for reducing fuel evaporative emissions can enable the evaporative emissions values (hot dip and diurnal emissions and values) of non-road mobile machines to meet the requirements of existing emission standards with respect to hot dip and diurnal emissions limits (the larger the fuel tank volume, the higher the evaporative emissions limit, determined by the fuel tank volume size). For example: taking a generator with the displacement of 224cc and the volume of an oil tank of 13L as an example, the current evaporative emission value of the generator is about 1.3g, and the generator meets the requirements of the current emission standard. However, when the standard of evaporative emission is improved and is limited according to the engine displacement (224 cc displacement generator, hot dipping and diurnal emission limit is less than 0.6 g), the existing means for reducing the evaporative emission of fuel is difficult to meet the higher emission standard, so that the problem of excessive emission still exists in the off-road mobile machinery.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a non-road removes machinery to solve among the prior art problem that the evaporative emission of non-road removes machinery exceeds standard easily.

In order to achieve the above object, the basic scheme of the utility model provides a non-road removes machinery, including fuel storage device, fuel feeding device, vapour adsorption equipment and engine body, vapour adsorption equipment is provided with the blow vent with the atmosphere intercommunication, fuel storage device's vapour discharge hole and vapour adsorption equipment's absorption mouth intercommunication still including connect in the valve mechanism between vapour adsorption equipment's desorption mouth and the inlet channel of engine body, the valve mechanism for the work operation along with the engine body and switch on, along with the work of engine body stops and the valve mechanism of separation.

The beneficial effect of this basic scheme lies in: by adopting the arrangement, the evaporative emission value of the non-road mobile machine is reduced by more than 60% compared with that in the prior art by carrying out evaporative pollutant emission tests on the non-road mobile machine, and the problem that the evaporative emission exceeds the standard easily under the emission standard with higher requirements of the non-road mobile machine is solved.

Further, the valve mechanism includes a valve control device that controls conduction and blocking of the valve mechanism according to an operating state of the engine body. With this arrangement, the opening and closing operation of the valve mechanism can be adjusted in time in accordance with a change in the operating state of the engine body, thereby preventing the vapor adsorbing device from discharging fuel vapor from the vent port or fuel vapor into the atmosphere through the intake passage of the engine body due to saturation of adsorption, and further reducing the evaporative emission of the off-road mobile machine.

Further, the valve control device is a pressure type control device that realizes operation of the valve mechanism in accordance with a pressure change of an intake passage of the engine body. By adopting the arrangement, the valve control device can adjust the conduction and the blockage of the valve mechanism in time according to the pressure change of the air inlet channel of the engine without arranging an additional power source, thereby having simple structure, being beneficial to improving the reliability and the timeliness of the valve mechanism during adjustment and further reducing the evaporation emission of the off-road mobile machinery.

Further, the pressure type control device comprises a fixing piece and a driving piece for conducting or blocking the operating valve mechanism, the fixing piece and the driving piece enclose a cavity with a variable volume, the pressure type control device further comprises a gas pressure pipeline for communicating the cavity with an air inlet channel of the engine body, and the pressure type control device further comprises an elastic resetting piece for resetting the driving piece. By adopting the arrangement, when the engine body is in a stop state, the air inlet channel of the engine body is in a normal pressure state, the volume of the cavity is in a larger state, and the driving piece enables the valve mechanism to be in a blocking state under the action of the elastic resetting piece; when the engine body is in a working state, negative pressure can be formed in the air inlet channel of the engine body, so that the cavity forms negative pressure under the action of the gas pressure pipeline communicated with the air inlet channel, the pressure outside the cavity is larger than the pressure inside the cavity, and the driving piece overcomes the acting force of the elastic resetting piece under the action of pressure difference to move or deform, so that the valve mechanism is conducted. The pressure change of the air inlet channel is transmitted to the pressure type control device in time through the gas pressure pipeline, so that the structure of the pressure type control device is simplified, and the reliability is improved.

Further, the valve control device is an electronic control device, and when the engine body is in a working running state, the electronic control device drives the valve mechanism to be conducted; when the engine body is in a work stop state, the electronic control device drives the valve mechanism to block. By adopting the arrangement, the valve control device can control the conduction and the blockage of the valve mechanism more accurately, thereby further reducing the evaporation discharge of the non-road mobile machinery.

Further, the fuel supply device is located outside the fuel storage device, and the balance hole of the fuel supply device is communicated with the vapor adsorption device. With this arrangement, the fuel vapor discharged through the balance hole of the fuel supply device is absorbed by the vapor adsorption device, thereby contributing to a reduction in the amount of evaporative emissions of the off-road mobile machine.

Further, the balance hole of the fuel supply device is directly communicated with the fuel storage device through a balance vent pipe. With such arrangement, the fuel vapor discharged from the balance hole is collected in the fuel storage device and then absorbed by the vapor adsorption device together with the fuel vapor in the fuel storage device, so that the vapor adsorption device does not need to consider the design when the fuel vapor at the balance hole is separately adsorbed, and the structural design of the vapor adsorption device is facilitated to be simplified.

Further, the balancing hole of the fuel supply device is directly communicated with a channel between the fuel storage device and the vapor adsorption device through a balancing vent pipe. By adopting the arrangement, more connecting ports are not required to be arranged on the fuel storage device and the vapor adsorption device, so that the fuel storage device and the vapor adsorption device can be directly used without changing the structures of the existing fuel storage device and the existing vapor adsorption device, and the production cost is favorably reduced.

Further, the balancing hole of the fuel supply device is directly communicated with a channel between the vapor adsorption device and the valve mechanism through a balancing vent pipe. With this arrangement, the fuel vapor discharged from the balance hole is first stored in the passage between the vapor adsorbing device and the valve mechanism, and the discharge of the fuel vapor into the environment is restricted by the vapor adsorbing device and the valve mechanism together, thereby contributing to further reduction in the amount of evaporative emission.

Further, the fuel supply device is a carburetor, an electronic injection valve body or an electronic injection oil pump. The carburetor, the electronic injection valve body and the electronic injection oil pump are all technically mature equipment for supplying fuel to an air inlet channel of the engine body, so that the improvement difficulty is reduced, and the performance of reducing evaporative emission is further improved.

Compared with the prior art, the utility model discloses reduced the evaporation emission of non-road mobile machinery, and institutional advancement is reliable and simple, and is with low costs, and through experimental verification, the evaporation emission index of non-road mobile machinery is less than the requirement of emission standard limit value, has avoided appearing discharging the phenomenon that exceeds standard.

Drawings

Fig. 1 is a schematic view of a non-road mobile machine according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a valve mechanism according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a valve mechanism according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of a third embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fourth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a fifth embodiment of the present invention.

Detailed Description

The utility model provides a "intercommunication" should be the broad sense and understand, can be that direct linking to each other and the intercommunication, also can adopt middle transition piece to link to each other and the intercommunication, for example use behind the pipe connection intercommunication.

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the fuel storage device 1, the adsorption breather pipe 2, the vapor adsorption device 3, the vent port 31, the adsorption port 32, the desorption port 33, the desorption breather pipe 4, the balance breather pipe 5, the engine body 6, the fuel supply device 7, the air filter device 8, the valve mechanism 9, the housing 91, the valve chamber 92, the air inlet passage 93, the air outlet passage 94, the valve control device 10, the fixing member 101, the driving member 102, the cavity 103, the elastic return member 104, and the gas pressure pipe 11.

The first embodiment is as follows: substantially as shown in figure 1: a non-road moving machine includes a fuel storage device 1, a vapor adsorption device 3, and an engine body 6. The fuel storage device 1 is provided with a vapor vent hole through which fuel vapor inside the fuel storage device 1 is discharged. In the present embodiment, the vapor adsorption device 3 is a canister in which activated carbon is stored, and the activated carbon is used to adsorb fuel vapor. The vapor adsorbing device 3 is provided with a vent hole 31 communicating with the atmosphere, so that air can be discharged through the vent hole 31 when positive pressure is formed inside the vapor adsorbing device 3, and external air can enter the vapor adsorbing device 3 through the vent hole 31 when negative pressure is formed inside the vapor adsorbing device 3. The vapor adsorbing device 3 is further provided with an adsorption port 32 into which the fuel vapor enters, and a desorption port 33 through which the fuel vapor is discharged when a negative pressure is applied.

The vapor discharge hole of the fuel storage device 1 communicates with the adsorption port 32 of the vapor adsorption device 3, and in the present embodiment, the vapor discharge hole communicates with the adsorption port 32 of the vapor adsorption device 3 through the adsorption breather pipe 2. The valve mechanism 9 is connected between the desorption port 33 of the vapor adsorption device 3 and the air intake passage of the engine body 6, in this embodiment, the desorption vent pipe 4 is connected between the desorption port 33 of the vapor adsorption device 3 and the air intake passage of the engine body 6, the valve mechanism 9 is installed on the desorption vent pipe 4, and the conduction and the separation between the desorption port 33 and the air intake passage of the engine body are realized through the conduction and the separation of the valve mechanism 9.

The valve mechanism 9 is a valve mechanism 9 that is opened in response to the operation of the engine body 6 and closed in response to the stop of the operation of the engine body 6. The valve mechanism 9 includes a valve control device 10 that controls the conduction and the blockage of the valve mechanism 9 according to the operating state of the engine body 6, and switching of the valve mechanism 9 between the conduction and the blockage states is facilitated by the valve control device 10. In the present embodiment, the valve control device 10 is a pressure type control device. As shown in fig. 2 and 3, the valve mechanism 9 includes a housing 91, a valve chamber 92 is arranged inside the housing 91, an inlet duct 93 and an outlet duct 94 which are communicated with the valve chamber 92 are connected to the housing 91, a valve plate which is in clutch fit with an end of the inlet duct 93 is arranged inside the valve chamber 92, when the valve plate is combined with the end of the inlet duct 93, the inlet duct 93 is blocked, and at this time, the valve mechanism 9 is in a blocking state; when the valve sheet is separated from the end of the intake duct 93, the intake duct 93 and the valve chamber 92 are in a conduction state, and at this time, the valve mechanism 9 is in a conduction state. The pressure type control device comprises a fixing piece 101 and a driving piece 102, wherein the fixing piece 101 and the driving piece 102 enclose a cavity 103 with a variable volume; in this embodiment, the driving member 102 is preferably a deformable membrane, the edge of the driving member 102 is connected and fixed to the fixing member 101, and the middle of the driving member 102 can move when being deformed. The valve plate of the valve mechanism 9 is connected to the middle of the driving member 102, and in this embodiment, the valve plate and the driving member 102 are integrally formed. The pressure control device further comprises a gas pressure pipeline 11 for communicating the cavity 103 with an air inlet channel of the engine body, when the engine body is in a working state, the air inlet channel of the engine body generates negative pressure, so that the cavity 103 between the fixing part 101 and the driving part 102 also generates negative pressure, so that pressure difference is generated on two sides of the driving part 102 to generate deformation, and the driving part 102 drives the valve plate to be separated from the end part of the air inlet channel 93, so that the air inlet channel 93 and the air outlet channel 94 are in a conducting state. The pressure type control device further includes a reset member for resetting the driving member 102, in this embodiment, the elastic reset member 104 is preferably a coil spring, the coil spring is located in a cavity 103 enclosed by the fixing member 101 and the driving member 102, one section of the coil spring is connected to the fixing member 101, and the other end of the coil spring abuts against the driving member 102, so that the driving member 102 has a tendency of keeping the valve mechanism 9 blocked under the action of the coil spring, when the engine body is in a work stop state, the air intake passage of the engine body is in a normal pressure state, so that the driving member 102 keeps the valve plate and the end of the air intake passage 93 in a combined state under the elastic force of the elastic reset member 104, so that the air intake passage 93 and the air exhaust passage 94 of the valve mechanism 9 are in a blocked state.

A fuel supply device 7 for adding fuel into the intake passage is connected to the intake passage of the engine body 6, and for example, the fuel supply device 7 is a carburetor for mixing fuel and air in the related art, and the mixed gas is introduced into the engine body 6 and burned. In another embodiment, the fuel supply device 7 may also be an electronic injection valve body or an electronic injection oil pump in the prior art, and fuel is added to the engine body by an electronic injection method. The fuel supply device 7 is provided with a balance hole for balancing the pressure of the internal oil reservoir chamber, and the balance hole communicates with the adsorption port 32 of the vapor adsorption device 3, so that the fuel vapor discharged from the balance hole enters the vapor adsorption device 3 and is adsorbed. In this embodiment, the balance hole is communicated with the adsorption port 32 of the vapor adsorption device 3 through the balance vent pipe 5, the vapor adsorption device 3 may be provided with the adsorption port 32 separately for the balance vent pipe 5 to be connected, or the balance vent pipe 5 and the adsorption vent pipe 2 may share one adsorption port 32.

The vapor adsorption device 3 is communicated with the air inlet side of the fuel supply device 7 through the desorption vent pipe 4, the air filter device 8 for filtering air to be fed into an air inlet channel of the engine body is generally arranged on the air inlet side of the fuel supply device 7, the end part of the desorption vent pipe 4 is connected to the air inlet channel between the air filter device 8 and the fuel supply device 7, and when negative pressure is generated in the air inlet channel, fuel vapor discharged by the vapor adsorption device 3 through the desorption vent pipe 4 enters the air inlet channel along with the air and then enters the engine body 6 for combustion.

The specific implementation process is as follows: the valve mechanism 9 is in a blocking state when the engine body 6 stops operating, fuel vapor in the fuel storage device 1 enters the vapor adsorption device 3 through the adsorption breather pipe 2 to adsorb fuel in the fuel vapor, and fuel vapor discharged from the fuel supply device 7 through the balance hole also enters the vapor adsorption device 3 to be adsorbed; when the engine body 6 is in the operating state, the valve mechanism 9 is switched from the blocking state to the conducting state under the pressure change of the intake passage of the engine body 6, so that the desorption breather pipe 4 generates negative pressure under the negative pressure action of the intake passage of the engine body 6, so that the fuel in the fuel vapor adsorbed in the vapor adsorption device 3 is desorbed and discharged under the negative pressure action of the desorption port 33, and finally enters the intake passage of the engine body 6 to be combusted.

Through to prior art with the utility model discloses a non-road removes machinery and carries out evaporative pollutant emission test (1 hour hot dipping and 24 hours emission) result and contrast, specifically uses the discharge capacity to be 224cc, and the oil tank volume is tested for 13L's generator, under the prerequisite that does not change the oil tank volume, and the evaporative emission value among the prior art is 1.34g, the utility model discloses an evaporative emission value is between 0.32g to 0.47g, promptly the utility model discloses an evaporative emission value has reduced more than 60% than the evaporative emission value among the prior art to the problem that the evaporative emission exceeds standard has been taken place easily to non-road removes machinery under the emission standard of higher requirement has been solved.

The second embodiment: the difference from the first embodiment lies in: as shown in fig. 4, the valve control device 10 is an electronic control device, and the electronic control device includes a working state signal acquisition module of the engine body 6, a working state signal processing module, and an execution module for switching the operation valve mechanism 9 between a conduction state and a blocking state, when the engine body 6 is in a working operation state, the working state signal acquisition module acquires a working operation signal and transmits the working operation signal to the working state signal processing module, the working state signal processing module sends a conduction execution signal to the execution module for the valve mechanism 9, and the execution module drives the valve mechanism 9 to conduct after receiving the conduction signal from the valve mechanism 9; when the engine body 6 is in a work stop state, the work stop signal is acquired by the work state signal acquisition module and is transmitted to the work state signal processing module, the work state signal processing module sends a valve mechanism 9 blocking execution signal to the execution module, and the execution module drives the valve mechanism 9 to block after receiving the valve mechanism 9 blocking execution signal. With this arrangement, the valve control device 10 can control the opening and closing of the valve mechanism 9 more accurately.

Example three: the difference from the first embodiment lies in: as shown in fig. 5, the balancing hole communicates with the fuel storage device 1 through the balancing breather pipe 5. With this arrangement, the fuel vapor discharged from the equilibrium hole is collected in the fuel storage device and then absorbed by the vapor adsorption device 3 together with the fuel vapor in the fuel storage device 1, so that the vapor adsorption device 3 does not need to consider the design for separately adsorbing the fuel vapor at the equilibrium hole, which is advantageous for simplifying the structural design of the vapor adsorption device 3.

Example four: the difference from the first embodiment lies in: as shown in fig. 6, the balance hole is communicated with the adsorption ventilation pipe 2 through the balance ventilation pipe 5, and the balance ventilation pipe 5 is connected with the adsorption ventilation pipe 2 through a three-way joint. With such an arrangement, there is no need to provide more connection ports on the fuel storage device 1 and the vapor adsorption device 3, and thus the fuel storage device can be used directly without changing the structures of the existing fuel storage device 1 and the vapor adsorption device 3, which is beneficial to reducing the production cost.

Example five: the difference from the first embodiment lies in: as shown in fig. 7, the equalization hole communicates directly with the section of the desorption vent line 4 between the vapor adsorption device 3 and the valve mechanism 9 through the equalization vent line 5. With this arrangement, the fuel vapor discharged from the balance hole is first stored in the passage between the vapor adsorption device and the valve mechanism, and the fuel vapor is restricted from being discharged into the environment by the vapor adsorption device and the valve mechanism together, thereby contributing to further reduction in the amount of evaporative emission.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims (11)

1. A non-road mobile machine comprising a fuel storage device, a fuel supply device, a vapor adsorption device, and an engine body, the vapor adsorption device being provided with a vent port communicating with the atmosphere, a vapor discharge hole of the fuel storage device communicating with an adsorption port of the vapor adsorption device, characterized in that: the device also comprises a valve mechanism connected between the desorption port of the vapor adsorption device and the air inlet channel of the engine body, wherein the valve mechanism is communicated along with the working operation of the engine body and blocked along with the working stop of the engine body.

2. The off-road mobile machine of claim 1, wherein: the valve mechanism includes a valve control device that controls conduction and blocking of the valve mechanism according to an operating state of the engine body.

3. The off-road mobile machine of claim 2, wherein: the valve control device is a pressure type control device that realizes operation of the valve mechanism in accordance with a pressure change of an intake passage of the engine body.

4. The off-road mobile machine of claim 3, wherein: the pressure type control device comprises a fixing piece and a driving piece for conducting or blocking the operating valve mechanism, the fixing piece and the driving piece enclose a cavity with a variable volume, the pressure type control device further comprises a gas pressure pipeline for communicating the cavity with an air inlet channel of the engine body, and the pressure type control device further comprises an elastic resetting piece for resetting the driving piece.

5. The off-road mobile machine of claim 2, wherein: the valve control device is an electronic control device, and when the engine body is in a working running state, the electronic control device drives the valve mechanism to be conducted; when the engine body is in a work stop state, the electronic control device drives the valve mechanism to block.

6. The off-road mobile machine of any of claims 1 to 5, wherein: the fuel supply device is located outside the fuel storage device, and the balance hole of the fuel supply device is communicated with the vapor adsorption device.

7. The off-road mobile machine of claim 6, wherein: the balance hole of the fuel supply device is directly communicated with the fuel storage device through a balance vent pipe.

8. The off-road mobile machine of claim 6, wherein: the balance hole of the fuel supply device is directly communicated with a channel between the fuel storage device and the vapor adsorption device through a balance vent pipe.

9. The off-road mobile machine of claim 6, wherein: the balance hole of the fuel supply device is directly communicated with a channel between the vapor adsorption device and the valve mechanism through a balance vent pipe.

10. The off-road mobile machine of claim 6, wherein: the fuel supply device is a carburetor, an electric injection valve body or an electric injection oil pump.

11. The off-road mobile machine of any of claims 7 to 9, wherein: the fuel supply device is a carburetor, an electric injection valve body or an electric injection oil pump.

Images