CN212883073U

CN212883073U - Sealing structure of ejection gun ejector rod and valve needle

Info

Publication number: CN212883073U
Application number: CN202021508043.8U
Authority: CN
Inventors: 向卫东
Original assignee: Taizhou Chaotian Pneumatic Tools Co ltd
Current assignee: Taizhou Chaotian Pneumatic Tools Co ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-04-06
Anticipated expiration: 2030-07-27

Abstract

The utility model provides a seal structure of spray gun ejector pin and needle belongs to spray gun technical field. It has solved its sealed poor problem of effect of current seal structure. This seal structure of spray gun ejector pin and needle, including ejector pin and needle, its characterized in that: the end of the ejector rod close to the valve needle is defined as a sealing end, the end of the valve needle close to the ejector rod is defined as a sealing end, a connector is arranged on the inner side of the sealing end of the valve needle, the caliber of the connector is continuously increased towards the ejector rod, an arc-shaped end face is arranged on the outer side of the sealing end of the ejector rod, and the arc-shaped end face is in sealing contact with the peripheral wall of the connector to realize sealing connection between the ejector rod and the valve needle. The sealing structure has the advantages of tight sealing and low failure rate.

Description

Sealing structure of ejection gun ejector rod and valve needle

Technical Field

The utility model belongs to the technical field of the spray gun, in particular to seal structure of spray gun ejector pin and needle.

Background

A spray gun is a device that uses rapid release of liquid and compressed air as a motive force, and its basic function is to atomize a coating or paint using compressed air and blow it onto a substrate. Sealing structures between the parts of the spray gun are particularly important in order to avoid high pressure coating or paint dripping out of the spray gun.

In the long-time, high strength use of spray gun, the condition of deviation and wearing and tearing may appear in the ejector pin in the spray gun and the axiality of needle, and current spray gun can't avoid the gas leakage that this condition leads to and ooze the problem, seriously influences spraying effect and work efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the technical problem, a seal structure of spray gun ejector pin and needle is proposed.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a seal structure of spray gun ejector pin and needle, includes ejector pin and needle, its characterized in that: the end of the ejector rod close to the valve needle is defined as a sealing end, the end of the valve needle close to the ejector rod is defined as a sealing end, a connector is arranged on the inner side of the sealing end of the valve needle, the caliber of the connector is continuously increased towards the ejector rod, an arc-shaped end face is arranged on the outer side of the sealing end of the ejector rod, and the arc-shaped end face is in sealing contact with the peripheral wall of the connector to realize sealing connection between the ejector rod and the valve needle.

In the sealing structure of the ejector rod and the valve needle of the spray gun, the peripheral wall of the connecting port comprises a conical surface and an arc-shaped surface, the arc-shaped surface is formed by smooth transition of the conical surface to the outermost end port of the sealing end of the valve needle, and the arc-shaped end surface is in sealing contact connection with the conical surface to realize sealing connection between the ejector rod and the valve needle.

In the above sealing structure for the ejector rod and the valve needle of the spray gun, the conical angle of the conical surface is 15 to 160 °.

In the sealing structure of the ejection rod and the valve needle of the spray gun, the radian of the arc-shaped end surface is R0.2-R3.

In the sealing structure of the ejector rod and the valve needle of the spray gun, the peripheral wall of the connecting port comprises a spherical surface and an arc-shaped surface, the arc-shaped surface is formed by smoothly transiting the spherical surface to the outermost end port of the sealing end of the valve needle, the arc-shaped end surface is of a spherical surface structure matched with the spherical surface of the connecting port, and the arc-shaped end surface is in sealing contact with the spherical surface of the connecting port to realize the sealing connection between the ejector rod and the valve needle.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses the aperture design of well connector crescent not only can inject the motion range of ejector pin, can increase the selection scope of ejector pin and needle contact surface moreover, makes the holistic sealed effect of spray gun more show.

2. The utility model discloses in can make the air smoothly and circulate fast, promote the agility of spray gun response.

3. The utility model discloses a sphere contact range is wide, rotate in a flexible way, the atress is even, the fault rate is low.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged schematic view at a in fig. 1.

In the figure, 1, a mandril; 2. a valve needle; 3. a connecting port; 31. a conical surface; 32. an arc-shaped surface; 4. an arc end surface.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the sealing structure of the ejection rod and the valve needle of the spray gun comprises an ejection rod 1 and a valve needle 2. The end that definition ejector pin 1 is close to needle 2 is sealed end, and the end that definition needle 2 is close to ejector pin 1 is sealed end, and the inboard of the sealed end of needle 2 has connector 3, and connector 3's bore is along constantly increasing towards ejector pin 1 direction, and the sealed end outside of ejector pin 1 has arc terminal surface 4, and arc terminal surface 4 is connected with the sealed contact of the wall all around of connector 3 and is realized the sealing connection between ejector pin 1 and the needle 2.

The gradually-increased caliber design of the connecting port 3 can limit the movement range of the ejector rod 1 and increase the selection range of the contact surface of the ejector rod 1 and the valve needle 2, and even if the coaxiality of the ejector rod 1 and the valve needle 2 is deviated in work, the arc-shaped end surface 4 of the ejector rod 1 can still be in sealing connection with the peripheral wall of the connecting port 3, so that the defect of loose sealing caused by the coaxiality deviation of the ejector rod 1 and the valve needle 2 is overcome, and the overall sealing effect of the spray gun is more remarkable.

Specifically, the peripheral wall of the connecting port 3 includes a conical surface 31 and an arc surface 32, the arc surface 32 is formed by smooth transition from the conical surface 31 to the outermost end port of the sealing end of the valve needle 2, and the arc end surface 4 is in sealing contact connection with the conical surface 31 to realize sealing connection between the ejector rod 1 and the valve needle 2. Preferably, the radian of the arc-shaped end surface 4 of the embodiment is R0.2-R3; the taper angle of the conical surface 31 in this embodiment is 15 ° to 160 °. The radian and the taper can ensure that the ejector rod 1 can be easily contacted with the valve needle 2 and can not fall off.

The connection port 3 may have a spherical surface structure in addition to the conical surface 31 structure described above, specifically as follows: the wall all around of connector 3 includes spherical face and arcwall face 32, and arcwall face 32 is formed for the spherical smooth transition towards the outer end port of needle 2 sealed end by spherical face, and arc terminal surface 4 is the spherical surface structure with connector 3's spherical face assorted, and arc terminal surface 4 is connected with connector 3's spherical face sealing contact and realizes the sealing connection between ejector pin 1 and the needle 2. The sphere contact range is wide, rotate in a flexible way, the atress is even, the fault rate is low, can effectively compensate the not tight defect of sealed that brings when ejector pin 1 and needle 2's axiality deviation, and operating personnel need not to change ejector pin 1 and needle 2 and can continue to use the spray gun, and the spraying is effectual and work efficiency is high.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the carrier rod 1, the valve needle 2, the connecting opening 3, the conical surface 31, the curved surface 32, the curved end surface 4, etc. are used more often, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a seal structure of spray gun ejector pin and needle, includes ejector pin (1) and needle (2), its characterized in that: the end, close to the valve needle (2), of the ejector rod (1) is defined as a sealing end, the end, close to the ejector rod (1), of the valve needle (2) is defined as a sealing end, a connecting port (3) is arranged on the inner side of the sealing end of the valve needle (2), the caliber of the connecting port (3) is continuously increased along the direction towards the ejector rod (1), an arc-shaped end face (4) is arranged on the outer side of the sealing end of the ejector rod (1), and the arc-shaped end face (4) is in sealing contact with the peripheral wall of the connecting port (3) to achieve sealing connection between the ejector rod (1) and the valve needle (2).

2. The sealing structure of the ejection rod and the valve needle of the spray gun as claimed in claim 1, wherein: the peripheral wall of the connecting port (3) comprises a conical surface (31) and an arc-shaped surface (32), the arc-shaped surface (32) is formed by smooth transition from the conical surface (31) to the outermost end port of the sealing end of the valve needle (2), and the arc-shaped end surface (4) is in sealing contact connection with the conical surface (31) to realize sealing connection between the ejector rod (1) and the valve needle (2).

3. The sealing structure of the ejection rod and the valve needle of the spray gun as claimed in claim 2, wherein: the conical angle of the conical surface (31) is 15-160 degrees.

4. The sealing structure of the ejection rod and the valve needle of the spray gun as claimed in claim 1, wherein: the radian of the arc end face (4) is R0.2-R3.

5. The sealing structure of the ejection rod and the valve needle of the spray gun as claimed in claim 1, wherein: the wall all around of connector (3) includes spherical face and arcwall face (32), arcwall face (32) are formed for by spherical face to the smooth transition of the sealed end port of needle (2) outermost end, above-mentioned arc terminal surface (4) be with the spherical face structure of the spherical face assorted of above-mentioned connector (3), sealed contact connection between ejector pin (1) and needle (2) is realized in arc terminal surface (4) and the spherical face of above-mentioned connector (3).