Carbon canister airtightness detection tool

Abstract

The utility model discloses a carbon canister airtightness detection tool, which comprises a connecting seat, a movable guide pillar and a limiting cover, a slotted hole is arranged on the connecting seat, the limiting cover is in threaded connection with the connecting seat and is positioned at the top end side of the slotted hole, the movable guide pillar is positioned in the slotted hole, the top end of the movable guide pillar penetrates through the limiting cover, and the movable guide pillar is movably connected with the limiting cover up and down. An elastic ring is further placed in the groove hole, the top end of the elastic ring abuts against the bottom end of the movable guide column, the bottom end of the elastic ring abuts against the bottom of the groove hole, the elastic ring is of an annular structure, and the upper end diameter and the lower end diameter are larger than the middle end diameter. The device has the advantages of being simple in structure and capable of improving the detection sealing performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle carbon can, specifically relates to a carbon can airtightness detection frock. BACKGROUND

[0002] The carbon can is generally installed between the gasoline tank and the engine. Since gasoline is a volatile liquid, the fuel tank is often full of vapor at normal temperature. The function of the fuel vapor emission control system is to introduce the vapor into combustion and prevent it from volatilizing into the atmosphere. The active carbon can storage device plays an important role in this process. Because the active carbon has adsorption function, when the car is turned off and parked, the gasoline vapor in the fuel tank enters the inside of the active carbon can through the pipeline and is adsorbed by the active carbon; when the car is running, fresh air enters from the air inlet of the active carbon can, carrying the gasoline vapor in the carbon can into the engine for combustion. Therefore, the sealing property of each carbon can needs to be detected.

[0003] The current state: directly connect the hose to the adsorption port or use the standard O-ring to block it and then perform airtightness test. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the technical problem to provide a carbon can airtightness detection frock, its simple structure can improve the detection sealing property.

[0005] To solve the above problems, the utility model adopts the following technical scheme:

[0006] A carbon can airtightness detection frock, including connecting seat, movable guide column, limit cover, the connecting seat is equipped with slot hole, the limit cover is screwed in the connecting seat and is located at the top end side of the slot hole, the movable guide column is located in the slot hole, and the top end penetrates the limit cover, the movable guide column is movably connected with the limit cover up and down, the slot hole is also placed with the elastic ring, the top end of the elastic ring is in contact with the bottom end of the movable guide column, and the bottom end is in contact with the bottom of the slot hole, the elastic ring is annular structure, and the diameters of the upper end and the lower end are greater than that of the middle end.

[0007] Further technical scheme is that the movable guide column is also distributed with at least one above convex table along the outer circumference, as the support of the movable guide column up and down in the slot hole, so that the movable guide column is not easy to shake when moving up and down.

[0008] Further technical scheme is that the connecting seat is also provided with a through hole between the limit cover and the convex table, for the gas in and out, so that the movable guide column can move up and down.

[0009] Further technical scheme is that the movable guide column is hollow structure, for the circulation of gas when detecting airtightness.

[0010] Further technical scheme is that the elastic ring is silica gel ring, of course, other materials of elastomer can also be used.

[0011] The utility model discloses the beneficial effects are:

[0012] The utility model discloses a carbon tank airtightness detection frock, since the elastic ring is pressed after the movable guide pillar, can guarantee the deformation is to the inside deformation, and it compares with traditional O type ring and silica gel ring, and it is bigger than the deformation of O type ring after extrusion, and the deformation stability of silica gel ring extrusion can be better sealed. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to make the technical scheme in the embodiment of the utility model or prior art clearer, the following will briefly introduce the drawing needed in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0014] Figure 1 It is the perspective drawing of the utility model discloses a carbon tank airtightness detection frock;

[0015] Figure 2 It is the explosion drawing of the utility model discloses a carbon tank airtightness detection frock;

[0016] Figure 3 It is the sectional view of the utility model discloses a carbon tank airtightness detection frock;

[0017] Figure 4 It is the schematic view of the utility model discloses a carbon tank airtightness detection frock connecting seat.

[0018] Figures 1-4 Middle: 1-connecting seat, 2-elastic ring, 3-movable guide pillar, 4-limit cap, 5-carbon tank, 6-boss, 7-through hole, 8-groove. PREFERRED EMBODIMENT

[0019] The preferred embodiment of the utility model is described in detail below, so that the advantages and characteristics of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0020] Reference Figures 1 to 4 As shown in the figure, a kind of carbon tank airtightness detection frock, including connecting seat 1, movable guide pillar 3, limit cap 4, connecting seat 1 is equipped with groove 8, limit cap 4 is threadedly connected in connecting seat 1 located at the top end side of groove 8, movable guide pillar 3 is located in groove 8, and its top end penetrates limit cap 4, movable guide pillar 3 is movably connected with limit cap 4, groove 8 is also placed with elastic ring 2, the top end of elastic ring 2 is in contact with the bottom end of movable guide pillar 3, and its bottom end is in contact on the bottom of groove 8, elastic ring 2 is annular structure, and the diameter of upper end and lower end is greater than the diameter of middle end.

[0021] The movable guide column 3 is provided with at least one convex platform 6 along the outer circumference, which is used as a support for the movable guide column 3 to move up and down in the slot 8, so that the movable guide column 3 is not easy to shake when moving up and down. The connecting base 1 is provided with a through hole 7 between the limiting cover 4 and the convex platform 6, which is used for the gas to enter and exit, so that the movable guide column 3 can move up and down. The movable guide column 3 is a hollow structure, which is used for the circulation of the gas when detecting the air tightness. The elastic ring 2 is a silica gel ring, and of course, other materials of elastic body can also be used.

[0022] In the embodiment, first, the elastic ring 2 is put into the slot 8, then the movable guide column 3 is put into the slot 8 and abuts against the elastic ring 2, then the limiting cover 4 is covered and screwed with the connecting base 1, then the top end of the movable guide column 3 is connected with a gas conveying device such as a gas pump through a gas pipe or a pipeline, then the carbon tank 5 is inserted into the movable guide column 3 from bottom to top, finally, the movable guide column 3 is moved down together with the gas pipe or the pipeline, so that the elastic ring 2 is deformed by being pressed by the movable guide column 3. Since the elastic ring 2 is a ring structure and the diameters of the upper and lower ends are greater than that of the middle end, the elastic ring 2 is deformed to the middle end first when deformed, and is pressed to the pipe opening of the carbon tank 5, so that the sealing effect is achieved.

[0023] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or substitutions without creative labor are covered in the protection scope of the present application.

Claims

1. A fixture for testing the airtightness of a charcoal canister, comprising a connecting seat, a movable guide post, and a limiting cover, wherein the connecting seat has a slot, the limiting cover is threadedly connected to the connecting seat at the top of the slot, the movable guide post is located within the slot and its top end penetrates the limiting cover, the movable guide post and the limiting cover are movably connected vertically, and an elastic ring is placed within the slot, the top end of the elastic ring abutting against the bottom end of the movable guide post, and its bottom end abutting against the bottom of the slot, characterized in that: The elastic ring is in a ring structure, and the diameters of the upper and lower ends are greater than that of the middle end.

2. The carbon can airtightness detection tool according to claim 1, characterized in that: The movable guide column is further provided with at least one convex platform along the outer circumference.

3. The carbon can airtightness detection tool according to claim 2, characterized in that: The connecting seat is further provided with a through hole between the limiting cover and the convex platform.

4. The carbon can airtightness detection tool of claim 1, wherein: The movable guide column is in a hollow structure.

5. The carbon can airtightness detection tool of claim 1, wherein: The elastic ring is a silica gel ring.

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