Sealing element for sealing a transition between a spray gun body and an attachment of a spray gun, attachment, in particular a paint nozzle arrangement for a spray gun and a spray gun, in particular a paint spray gun

Abstract

A sealing element seals a transition between a body of a spray gun, in particular a paint spray gun, and an attachment of a spray gun, in particular a paint spray gun, in particular a paint nozzle. The sealing element is configured so that it forms an axially acting sealing surface and a radially acting sealing surface with the body and/or the attachment when the attachment is arranged in body. An attachment, in particular a paint nozzle arrangement for a spray gun, in particular a paint spray gun, and a spray gun, in particular a paint spray gun can each have such a sealing element. Due to the axially acting sealing surface and the radially acting sealing surface, the sealing element provides a significantly improved sealing effect relative to sealing elements of the prior art.

Claims

1. A sealing element comprising: a first section configured to mate with an attachment of a spray gun; and a second section comprising an expandable portion that widens at an end opposite the first section, the expandable portion configured to form an axially acting sealing surface and a radially acting sealing surface with a body of the spray gun when the attachment of the spray gun is arranged in the body.

2. The sealing element according to claim 1, wherein the expandable portion is configured to expand when the attachment is tightened in the body, to thereby form the radially acting sealing surface with the body.

3. The sealing element according to claim 1, wherein the first section comprises at least one device for arranging the sealing element on the attachment, and wherein the second section is configured as a hollow truncated cone.

4. The sealing element according to claim 3, wherein the at least one device is a snap-in tab.

5. The sealing element according to claim 4, wherein the snap-in tab is a circumferential snap-in tab.

6. The sealing element according to claim 1, wherein the expandable portion includes a flexible material.

7. The sealing element according to claim 6, wherein the flexible material is high-density polyethylene (HDPE).

8. The sealing element according to claim 1, wherein the expandable portion comprises: a first surface configured to form the axially acting sealing surface when in contact with a first counter-sealing surface of the body; and a second surface configured to form the radially acting sealing surface when in contact with a second counter-sealing surface of the body.

9. A paint nozzle arrangement for a paint spray gun, the paint nozzle arrangement comprising: a paint nozzle including: a front end with a paint outlet opening, a rear end comprising a paint inlet opening, and a substantially hollow cylindrical section situated between the front end and the rear end; and a sealing element including: a first section configured to mate with the paint nozzle, and a second section comprising an expandable portion that widens at an end opposite the first section, the expandable portion configured to form an axially acting sealing surface and a radially acting sealing surface with a body of the paint spray gun when the paint nozzle is arranged in the body.

10. The paint nozzle arrangement according to claim 9, wherein at least a portion of the sealing element has substantially the same inside diameter as the substantially hollow cylindrical section.

11. The paint nozzle arrangement according to claim 9, wherein the expandable portion is configured to expand when the paint nozzle is tightened in the body to thereby form the radially acting sealing surface with the body.

12. The paint nozzle arrangement according to claim 9, wherein the expandable portion comprises: a first surface configured to form the axially acting sealing surface when in contact with a first counter-sealing surface of the body; and a second surface configured to form the radially acting sealing surface when in contact with a second counter-sealing surface of the body.

13. A paint spray gun comprising: a body having at least one area for accommodating an attachment and including at least one area with a substantially cylindrical wall section that is at least partially threaded; and a sealing element including: a first section configured to mate with the attachment, and a second section comprising an expandable portion that widens at an end opposite the first section, the expandable portion configured to form an axially acting sealing surface and a radially acting sealing surface with the body of the paint spray gun when the attachment is arranged in the body.

14. The paint spray gun according to claim 13, wherein the body further comprises a shoulder arranged at one end of the substantially cylindrical wall section.

15. The paint spray gun according to claim 14, wherein an inside diameter of at least one portion of the substantially cylindrical wall section is greater than or equal to an outside diameter of the sealing element.

16. The paint spray gun according to claim 14, wherein the sealing element is arranged between the body and the attachment and, when the attachment is arranged in the body, forms the radially acting sealing surface with the substantially cylindrical wall section and the axially acting sealing surface with the shoulder.

17. The paint spray gun according to claim 14, wherein the attachment is a paint nozzle.

18. The paint spray gun according to claim 13, further comprising a stop for the attachment that also limits expansion of the sealing element.

19. The paint spray gun according to claim 13, further comprising: a paint spray nozzle as the attachment, the paint spray nozzle including: a front end with a paint outlet opening, a rear end comprising a paint inlet opening, and a substantially hollow cylindrical section situated between the front end and the rear end.

20. The paint spray gun according to claim 13, wherein the expandable portion comprises: a first surface configured to form the axially acting sealing surface when in contact with a first counter-sealing surface of the body; and a second surface configured to form the radially acting sealing surface when in contact with a second counter-sealing surface of the body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure is explained in more detail below, by way of example and with reference to six figures. In the figures:

(2) FIG. 1 shows an exploded view of an embodiment of a spray gun according to the prior art,

(3) FIG. 2 shows a sectional view of a paint nozzle arrangement according to the prior art,

(4) FIG. 3 shows a sectional view of the head area of the spray gun according to the prior art,

(5) FIG. 4 shows a sectional view of an illustrative embodiment of a paint nozzle arrangement according to the disclosure or a sealing element according to the disclosure arranged on a paint nozzle in the unassembled state,

(6) FIG. 5 shows a sectional view of an illustrative embodiment of a paint nozzle arrangement according to the disclosure or a sealing element according to the disclosure arranged on a paint nozzle in the unassembled state, and

(7) FIG. 6 shows a detail view of the area of effect of the illustrative embodiment of a sealing element according to the disclosure in the assembled, i.e., tightened, i.e., expanded state.

DETAILED DESCRIPTION

(8) FIG. 1 shows an exploded view of a spray gun 1 according to the prior art. The spray gun 1 can have a container 3 for receiving and dispensing the material being sprayed, in which the container includes a cover 3b with a valve plug 3a, a container body 3c and a plug-in screen 3d. The spray gun 1 can also have a material amount regulation device 11, an air micrometer 13, a round wide-jet regulation device 9, a trigger guard system 7 consisting of a trigger guard and fastening devices, and an air connection, which can be designed as a standard connection 4a or as a rotary joint connection 4b. A paint nozzle arrangement 24 can be arranged on the head area 6 of the body 2. The spray gun 1 also includes an air cap 76, which can be fastened, in particular screwed onto the head area 6 via an air nozzle ring 74. In the present case, the head area 6, the paint nozzle arrangement 24 and the air cap 76 with air nozzle ring 74 are arranged or can be arranged coaxially along an axis Z, which in the present case represents the aforementioned central or longitudinal axis of the head area 6 of the body 2, the central or longitudinal axis of the paint nozzle arrangement 24, the central or longitudinal axis of the upper part of the body 2 and the central or longitudinal axis of a receptacle opening for accommodating the material amount regulation device 11. The spray gun 1 also has a sealing element 44 configured as a paint nozzle seal according to the prior art, which is described in more detail below.

(9) FIG. 2 shows a sectional view of a paint nozzle arrangement 24 with a sealing element 44 according to the prior art. In the present case, the sealing element 44 is configured as a paint nozzle seal. The paint nozzle 40 has an external thread 46. The sealing element 44 is arranged on the rear end of the paint nozzle 40. It is designed to be essentially sleeve-like and has a circumferential collar at its rear end and in its middle area.

(10) FIG. 3 shows a sectional view of the head area 6 of a spray gun according to the prior art with the paint nozzle arrangement 24 with the sealing element 44 according to the prior art of FIG. 2 in the assembled state. The paint nozzle arrangement 24, which in the present case consists of a material nozzle 40 with various additional components, a paint outlet opening 28 and the sealing element 44, is screwed into the body 2 or its head area 6 via the external thread 46 shown in FIG. 2 and an internal thread 10 in the head area 6 of the body 2 of spray gun 1.

(11) The sealing element 44 in the screwed-in paint nozzle arrangement 24 is pressed against a counter-sealing surface 84 and seals off the material-guiding area of the spray gun 1, in particular the transition area between the paint channel in the body 2 and the hollow section of the paint nozzle 40 for passage of the material being sprayed relative to the air-guiding area of the spray gun 1. The sealing element 44 then forms only an axially acting sealing surface with the body 2, namely against the counter-sealing surface 84.

(12) FIG. 3 also shows an impact disk 30 with an impact surface 30a and a center wall 12 on the head area 6 of body 2. The significance of these components is explained further below.

(13) FIG. 4 shows an example of an illustrative embodiment of a sealing element 440 according to the disclosure designed as a paint nozzle seal. The sealing element 440 in the present case is arranged at the same position in a spray gun 1 as the sealing element 44 in the spray gun 1 of FIG. 1 and at the same position on a paint nozzle as the sealing element 44 on paint nozzle 40 of FIG. 2.

(14) The sealing element 440 has a device on the front section for arrangement of the sealing element 440 on a paint nozzle 40, which in the present case can be the same paint nozzle 40 as the paint nozzle 40 shown in the previous figures, and the device for arrangement of the sealing element 440 in the present case is configured as a circumferential snap-in tab 442. An essentially cylindrical section located between the front and rear section of the sealing element 440 has a circumferential collar 443, which in the present case functions as a stop for positioning the sealing element 440 on the point nozzle 40. The sealing element 440 also has a rear section configured as a truncated hollow cone 441.

(15) FIG. 5 shows an illustrative embodiment of a paint nozzle arrangement 240 according to the disclosure or a paint nozzle 40 with an illustrative embodiment of a sealing element 440 according to the disclosure arranged thereon. The paint nozzle 40 can be designed like the paint nozzle 40 of FIG. 2 and FIG. 3.

(16) The inside diameter of the essentially cylindrical center section of the sealing element 440 and the inside diameter of the front section of the sealing element 440 are essentially the same as the inside diameter of the hollow cylindrical section 402 of the paint nozzle 40. A particularly undisturbed flow of the material being sprayed from the sealing element 440 into the essentially hollow cylindrical section 402 of the paint nozzle 40 is thus possible.

(17) FIG. 6 shows a detail view of the effective area of an illustrative embodiment of a sealing element 440 according to the disclosure in the assembled, i.e., tightened, i.e., expanded state, i.e., with the paint nozzle arrangement 240 arranged, in particular screwed in, in particular tightened in the body 2 of a spray gun 1.

(18) An area for accommodating an attachment for a body 20, in the present case the paint nozzle arrangement 240 of FIG. 5, has an essentially cylindrical wall section 50 with a shoulder 54 arranged at one end of the wall section 50, which in the present case is designed to be circumferential. The sealing element 440 forms an axially acting sealing surface 56 and a radially acting sealing surface 58 with the body 20. In particular, the sealing element 440 forms an axially acting sealing surface 56 with the shoulder 54 and a radially acting sealing surface 58 with the cylindrical wall section 50. For this purpose, the rear section of the sealing element 440 is designed as a hollow truncated cone 441. This hollow truncated cone 441 expands when the paint nozzle arrangement 240 is arranged, in particular tightened in the body 20, and thereby forms the radially acting sealing surface 58 with the body 20.

(19) The inside diameter of the essentially cylindrical middle section of the sealing element 440 is essentially the same as the inside diameter of the paint channel 201 located upstream of the sealing element 440. As a result, in addition to the above-described undisturbed flow of the material being sprayed from sealing element 440 into the essentially hollow cylindrical section 402 of the paint nozzle 40, a particularly undisturbed flow of the material being sprayed from the paint channel 201 into the sealing element 440 is also possible. In addition, stages in which paint accumulates, dries out and can adversely affect the material flow and material quality, in particular the material purity, can thus be avoided.

(20) The inside diameter of the essentially cylindrical wall section 50 in the present illustrative embodiment is somewhat larger than the outside diameter of the unexpanded sealing element 440 at its largest location. As already mentioned above, an easier arrangement is thereby possible, in particular screwing-in the paint nozzle arrangement 240 with the sealing element 440 into the body 20, since very little or no friction resistance need be overcome between the sealing element 440 and the cylindrical wall section 50. Wear of the sealing element 440, which in the case of a larger outside diameter of sealing element 440 would result from friction of the sealing element 440 on the cylindrical wall section 50, can also be avoided.

(21) Apart from the sealing element 440, the components shown in FIGS. 1 to 3 can also be used in the present disclosure. For example, the paint nozzle arrangement 240 or the sealing element arranged on a paint nozzle 40 shown in FIG. 1 can be installed in the spray gun 1 instead of the paint nozzle arrangement 24 shown there or instead of the sealing element 44 shown there. In the present illustrative embodiment, an impact disk 30, in particular the impact surface 30a thereof and a middle wall 12 of the head area 6 of body 2 shown in FIG. 3 can form a stop for the paint nozzle arrangement 240, which also defines the maximum expansion of sealing element 440.

(22) The above illustrative embodiment describes only a limited selection of possible implementations and therefore does not represent a restriction of the present disclosure.