CN201007251Y

CN201007251Y - Pin valve body with seat face stepdouble cones structure

Info

Publication number: CN201007251Y
Application number: CNU200720105625XU
Authority: CN
Inventors: 郭义成
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-16
Filing date: 2007-01-16
Publication date: 2008-01-16
Anticipated expiration: 2017-01-16

Abstract

The utility model relates to a fuel injecting device of the diesel engine fuel system, in particular to a needle valve body which has a groove structure on a base surface, which mainly solves the technical problem in the prior art that the needle valve impacts the base surface thousands of times per minute when working in the needle valve body so that the diameter of the sealing line can be decreased along with the increasing of the working time, the opening pressure and the fuel atomization quality are reduced, the utilizing life is shorter, and the like. The utility model comprises the needle valve body (1) having a cavity in the inner side, wherein the cavity is adaptable with the shape of the needle valve (2), and the end of the needle valve body (1) is opened with a fuel injecting hole. The utility model is characterized in that the inner side of the needle valve body (1) is two ladder inner tapered surfaces.

Description

The needle-valve body of seat surface ladder bipyramid structure

Technical field

The utility model relates to a kind of fueling injection equipment of diesel fuel system, especially relates to a kind of isostructural improvement of needle-valve body to seat surface band groove structure.

Background technique

Existing diesel injector generally adopts the taper pintle nozzle match-ing parts, the face that is the potted line place of needle-valve is the conical surface, the cone match of needle-valve body of about 1 degree of cone angle difference is formed potted line by the differential seat angle of the two, so potted line is always in the conical surface upper edge of needle-valve or needle-valve body.Chinese patent discloses a kind of diesel engine of locomotive, and (publication number: CN 2643011Y), it is made up of critical pieces such as pintle nozzle match-ing parts, pressure adjusting spring, oil injector body and seat boards, and its pintle nozzle match-ing parts is short type pintle nozzle match-ing parts with T series short needle valve fuel injector.Short type needle-valve length is 48～53mm; Jet orifice of needle valve quantity is 10, and the jet orifice of needle valve diameter is 0.4mm; Its needle-valve body pressure chamber diameter reduces 35～40% than pressure chamber's diameter of elongated pintle nozzle match-ing parts; Its needle-valve head seal conical surface is the bipyramid structure; Its needle-valve sealing cone angle is 90 ° or 60 °; Its short type needle-valve body large end face sealing employing circular groove type or plane sealing, pin locate mode; Its injection pressure is regulated and is adopted bolt pressure regulation or pad pressure regulation.Impact seat surface thousands of times with per minute when the needle-valve of this structure is worked in needle-valve body, thereby cause potted line to reduce with the increase of operating time, thereby reduced bearing area, reduced cracking pressure and fuel-oil atmozation quality, working life is shorter.

Summary of the invention

The purpose of this utility model provides a kind of needle-valve body of seat surface ladder bipyramid structure, it mainly is to impact seat surfaces thousands of times with per minute when solving the existing in prior technology needle-valve and working in needle-valve body, thereby cause the potted line diameter to reduce with the increase of operating time, thereby cracking pressure and fuel-oil atmozation quality have been reduced, the technical problem that working life is short etc.

Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:

The needle-valve body of seat surface ladder bipyramid structure of the present utility model, the needle-valve body that cavity is arranged in comprising, cavity and needle-valve shape adapt, and the needle-valve body end has nozzle opening, the inner face that it is characterized in that described needle-valve body is 2 inner conical surfaces that are ladder-type, i.e. needle-valve body inner conical surface bottom integrated depression.Needle-valve potted line diameter increases with the operating time and can not reduce, and the increase bearing area that up broadens, and can prolong oil nozzle working life.

As preferably, described 2 inner conical surfaces that are ladder-type are made up of two inner conical surfaces up and down and the cylndrical surface or the conical surface that connect these two inner conical surfaces.Top inner conical surface, cylndrical surface or conical surface, bottom inner conical surface form ladder-type successively.

As preferably, on the axial cross section of described needle-valve body, the cone angle difference of two inner conical surfaces is γ-θ=0～2 ° up and down.

As preferably, on the axial cross section of described needle-valve body, the ladder depth H that forms of two inner conical surfaces is 0.003mm～0.3mm up and down.

As preferably, on the axial cross section of described needle-valve body, the ladder depth H that forms of two inner conical surfaces is 0.004mm～0.04mm up and down.

As preferably, on the axial cross section of described needle-valve body, the difference of the interior cone angle gamma of needle-valve body top inner conical surface and the cone angle of needle-valve is γ-α=0～2 °.Can broadening with the sealing strip of the increase needle-valve of operating time, and sealed diameter can not reduce, and promptly can not reduce cracking pressure, the state when the fuel-oil atmozation quality still can keep initial.

As preferably, on the axial cross section of described needle-valve body, the end opening line of two inner conical surfaces is formed the β angle up and down, and the difference at the cone angle of needle-valve and β angle is alpha-beta=30 '～2 °.

Therefore, the utlity model has in use along with the increase of operating time, not only the potted line diameter can not reduce, and sealing strip upwards broadens and increased bearing area, thereby kept the constant and fuel-oil atmozation steady quality of injection pressure of injector, the characteristics that significantly improve working life; Characteristics such as it is longer than traditional injector nozzle matching parts that the utility model also has working life, simple and reasonable for structure.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the present utility model;

Accompanying drawing 2 is the supporting a kind of structural representations of needle-valve and needle-valve body;

Accompanying drawing 3 is a kind of assembly structure schematic representation of the present utility model.

Embodiment

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: the needle-valve body of the seat surface band groove structure that this of this example is routine, as Fig. 1, Fig. 2, a metal needle-valve body 1 is arranged, its inside is provided with cavity, and needle-valve 2 places in it.Needle-valve body 1 bottom has nozzle opening.The inner conical surface of needle-valve body 1 is divided into the inner conical surface of upper and lower 2 ladder-types, and when needle-valve body 1 cooperated needle-valve 2, the sealing strip 2-1 of needle-valve 2 was between upper and lower 2 ladder-type inner conical surfaces.On the axial cross section of needle-valve body 1, the ladder depth H of two inner conical surface formation is 0.012mm up and down; The end opening line of upper and lower two inner conical surfaces is formed the β angle, promptly gets 1 a at inner conical surface end opening place, needle-valve body 1 top, and 1 b is got at inner conical surface end opening place, bottom, line a, b form the β angle, the cone angle of needle-valve 2 seat surfaces be 60 ° 20 ', the β angle be 59 ° 20 ', its difference is alpha-beta=1 °; The angle of the cone angle of needle-valve body 1 upper and lower two inner conical surfaces all be 60 ° 40 ', its difference is γ-θ=0 °; The difference of the interior cone angle gamma of needle-valve body 1 top inner conical surface and the cone angle of needle-valve 2 be γ-α=20 '.

During use, as Fig. 3, needle-valve 2 is packed in the needle-valve body 1, at the needle-valve body 1 inner fuel oil that injects, needle-valve 2 is done the piston motion up and down in needle-valve body 1, and fuel oil penetrates from the nozzle opening that is located at needle-valve body 1 bottom.

Claims

1. the needle-valve body of a seat surface ladder bipyramid structure, the needle-valve body (1) that cavity is arranged in comprising, cavity and needle-valve (2) shape adapts, and needle-valve body (1) end has nozzle opening, and the inner face that it is characterized in that described needle-valve body (1) is 2 inner conical surfaces that are ladder-type.

2. the needle-valve body of seat surface ladder bipyramid structure according to claim 1 is characterized in that described 2 inner conical surfaces that are ladder-type are made up of two inner conical surfaces up and down and the cylndrical surface or the conical surface that connect these two inner conical surfaces.

3. the needle-valve body of seat surface ladder bipyramid structure according to claim 1 and 2 is characterized in that on the axial cross section of described needle-valve body (1) that the cone angle difference of two inner conical surfaces is γ-θ=0～2 up and down

4. the needle-valve body of seat surface ladder bipyramid structure according to claim 3 is characterized in that on the axial cross section of described needle-valve body (1), and the ladder depth H of two inner conical surface formation is 0.003mm～0.3mm up and down.

5. the needle-valve body of seat surface ladder bipyramid structure according to claim 4 is characterized in that on the axial cross section of described needle-valve body (1), and the ladder depth H of two inner conical surface formation is 0.004mm～0.04mm up and down.

6. the needle-valve body of seat surface ladder bipyramid structure according to claim 3 is characterized in that on the axial cross section of described needle-valve body (1), and the difference of the interior cone angle gamma of needle-valve body (1) top inner conical surface and the cone angle of needle-valve (2) is γ-α=0～2 °.

7. the needle-valve body of seat surface ladder bipyramid structure according to claim 5 is characterized in that on the axial cross section of described needle-valve body (1), and the difference of the interior cone angle gamma of needle-valve body (1) top inner conical surface and the cone angle of needle-valve (2) is γ-α=0～2 °.

8. the needle-valve body of seat surface ladder bipyramid structure according to claim 7, it is characterized in that on the axial cross section of described needle-valve body (1), the end opening line of two inner conical surfaces is formed the β angle up and down, and the cone angle of needle-valve (2) and the difference at β angle are alpha-beta=30 '～2 °.