CN213768265U

CN213768265U - Fuel steam circulating pipe

Info

Publication number: CN213768265U
Application number: CN202022545049.9U
Authority: CN
Inventors: 王冬
Original assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Current assignee: Chongqing Jinkang Sailisi New Energy Automobile Design Institute Co Ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-07-23
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a fuel steam circulating pipe, include the body and install in the internal throttle endotheca of body, the throttle endotheca makes the sectional area of the flow of the internal gas of body diminish and forms the shrinkage cavity. The utility model discloses throttle endotheca and body set up the structure for the components of a whole that can function independently, do benefit to the throttle endotheca and realize standardized manufacturing, improve the poor problem of body shrinkage cavity department uniformity.

Description

Fuel steam circulating pipe

Technical Field

The utility model belongs to the technical field of the automobile manufacturing, a fuel steam circulating pipe is related to.

Background

Along with the upgrading of emission standards, fuel vapor replaced in an oil tank during fuel filling is required to be filtered by an activated carbon tank and then can be discharged; the fuel steam circulating pipe has the function that a part of displaced fuel steam returns to the head part of the oil filling pipe through the steam circulating pipe and returns to the oil tank along with the liquid fuel, so that the total amount of the fuel steam which is led to the activated carbon tank is reduced, and the workload of the activated carbon tank is reduced.

The existing fuel steam circulating pipe realizes steam circulation through a Venturi effect, so the pipe diameter needs to be reduced near an oil filling port so as to form negative pressure during oil filling and enable fuel steam to circulate. The process causes the size of the shrinkage cavity to generate larger manufacturing error in the forming process, thereby causing poor structural consistency of products.

Therefore, in view of the above problems, there is a need for a fuel vapor circulation pipe which improves the problem of poor consistency at the constricted site.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a fuel steam circulating pipe, this fuel steam circulating pipe installs the throttle endotheca in order to realize the aperture to reduce, and this lockhole size is invariable, and the uniformity is good.

The utility model discloses a fuel steam circulating pipe, include the body and install in the internal throttle endotheca of body, the throttle endotheca makes the sectional area of the flow of the internal gas of body diminish and forms the shrinkage cavity.

Furthermore, the throttling inner sleeve comprises a sleeve and a throttling ring connected in the sleeve, and the inner diameter of the throttling ring is smaller than that of the sleeve to form a shrinkage cavity in the pipe body.

Furthermore, the outer circle of the throttling inner sleeve is in sealing fit with the inner circle of the pipe body.

Furthermore, the outer circle of the throttling inner sleeve is in interference fit with the inner circle of the pipe body in a sealing mode.

Further, the sleeve and the throttle ring are integrally formed.

Furthermore, the throttling inner sleeve is made of plastic materials.

Further, the throttling inner sleeve is made of POM materials.

Furthermore, the aperture of the inner circle of the throttling ring is 3-4 mm.

The utility model has the advantages that:

the throttling inner sleeve and the pipe body of the utility model are of a split structure, thereby being beneficial to realizing the standardized manufacture of the throttling inner sleeve and improving the problem of poor consistency at the shrinkage cavity of the pipe body; the shrinkage cavity is formed by the throttling ring, the sleeve plays a role of fixing with the inner wall of the tube body, the structure can enable the sleeve to be made into a thin-wall structure, the material consumption can be reduced, in addition, the contact area between the sleeve and the inner wall of the tube body can be increased, and the sealing between the outer circle of the sleeve and the inner circle of the tube body is facilitated; the throttling inner sleeve is made of plastic, the throttling inner sleeve is convenient to mount, automatic sealing between the outer circle of the throttling inner sleeve and the inner circle of the pipe body is facilitated through the deformation of the throttling inner sleeve under pressure, the shrinkage cavity is not corroded due to the use of the plastic, the condition that the inner wall is easily corroded after the metal pipe body is punched and molded is avoided, the oil resistance of the throttling inner sleeve is good, and the service life of the throttling inner sleeve is long.

Drawings

The invention is further described with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

Detailed Description

FIG. 1 is a schematic structural view of the present invention;

as shown in the figure: the present embodiment provides a fuel vapor circulation pipe comprising a pipe body 1 and a throttle inner 2 installed in the pipe body, which makes the sectional area of the flow of gas in the pipe body small to form a constricted hole. As shown in a combined figure 1, a pipe body 1 is connected with an oil filling opening of an oil inlet pipe 3, fuel oil is injected from an oil inlet and flows into an oil tank through an oil inlet pipe in the oil filling process, the arrangement of a shrinkage hole is beneficial to forming negative pressure at the oil filling opening of the oil inlet pipe, the circulation of fuel oil steam is beneficial and the leakage of the fuel oil steam is effectively prevented, a throttling inner sleeve is arranged in the pipe body in a press-fitting mode, the throttling inner sleeve is arranged at one end, close to the connection end of the oil inlet pipe, in the pipe body, the throttling inner sleeve and the pipe body are of a split structure, the standardized manufacture of the throttling inner sleeve is facilitated, and the problem of poor consistency at the shrinkage hole of the pipe body is solved.

In this embodiment, the throttling inner sleeve includes a sleeve 2a and a throttling ring 2b connected in the sleeve, and the inner diameter of the throttling ring is smaller than the inner diameter of the sleeve to form a shrinkage cavity in the pipe body. The throttling ring can be connected to the end part of the sleeve or can be connected to the middle position of the inner circle of the sleeve, as shown in a combined figure 1, the throttling ring is connected to the inner end part of the sleeve in the embodiment, the shrinkage cavity is formed through the throttling ring, the sleeve plays a role of being fixed with the inner wall of the pipe body, the structure can enable the sleeve to be made into a thin-wall structure, the material consumption can be reduced, in addition, the contact area between the sleeve and the inner wall of the pipe body can be increased, and the sealing between the outer circle of the sleeve and the inner circle of the pipe body is facilitated.

In this embodiment, the outer circle of the throttling inner sleeve is in sealing fit with the inner circle of the pipe body. The outer circle of the throttling inner sleeve and the inner circle of the pipe body can be sealed through a sealing ring or in a bonding mode, and the sealing structure ensures that all gas flows through the shrinkage cavity, so that the gas is prevented from leaking between the outer circle of the throttling inner sleeve and the inner circle of the pipe body, and the negative pressure environment is favorably formed.

In this embodiment, the outer circle of the throttling inner sleeve is in sealing fit with the inner circle of the pipe body in an interference fit manner. The throttling inner sleeve is pressed into the pipe body in a pressing mode, a special tool is adopted for pressing in the actual installation process, the installation position of the throttling inner sleeve is accurately controlled by controlling the pressing-in size, and the improvement of the installation precision of the throttling inner sleeve is facilitated.

In this embodiment, the sleeve 2a and the throttle ring 2b are integrally formed. The integral molding structure of the sleeve and the throttling ring can simplify the structure of the whole throttling inner sleeve and reduce the connecting structure.

In this embodiment, the throttling inner sleeve is made of plastic. The plastic deformation through the plastic material is favorable for pressing the throttling inner sleeve into the pipe body, so that the throttling inner sleeve is convenient to install, the deformation caused by the compression of the throttling inner sleeve is favorable for automatically forming sealing between the outer circle of the throttling inner sleeve and the inner circle of the pipe body, the plastic material is used, the shrinkage cavity is not corroded, and the situation that the inner wall is corroded easily after the metal pipe body is punched and molded can be avoided.

In this embodiment, the throttling inner sleeve is made of POM material. The POM material is also called polyformaldehyde resin, and has the advantages of good oil resistance, long service life, excellent mechanical strength, rigidity and fatigue strength, good environmental resistance, good organic solvent resistance, long service life in an oil pipe, strong repeated impact resistance, self-lubricating property, easy installation and good wear resistance.

In this embodiment, the aperture of the inner circle of the throttle ring is 3-4 mm. The opening of the throttle ring is preferably 3.5mm, and the shrinkage cavity in the range enables the circulation effect of fuel steam to be good as measured through experiments.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A fuel vapor circulation tube characterized by: the gas throttling device comprises a pipe body and a throttling inner sleeve arranged in the pipe body, wherein the throttling inner sleeve enables the flowing sectional area of gas in the pipe body to be reduced to form a shrinkage cavity.

2. The fuel vapor circulation tube of claim 1, wherein: the throttling inner sleeve comprises a sleeve and a throttling ring connected in the sleeve, and the inner diameter of the throttling ring is smaller than that of the sleeve to form a shrinkage cavity in the pipe body.

3. The fuel vapor circulation tube of claim 1, wherein: the outer circle of the throttling inner sleeve is matched with the inner circle of the pipe body in a sealing mode.

4. The fuel vapor circulation tube of claim 3, wherein: the outer circle of the throttling inner sleeve is in sealing fit with the inner circle of the pipe body in an interference fit mode.

5. The fuel vapor circulation tube of claim 2, wherein: the sleeve and the throttle ring are integrally formed.

6. The fuel vapor circulation tube of claim 4, wherein: the throttling inner sleeve is made of plastic.

7. The fuel vapor circulation tube of claim 6, wherein: the throttling inner sleeve is made of POM material.

8. The fuel vapor circulation tube of claim 2, wherein: the aperture of the inner circle of the throttling ring is 3-4 mm.