Relay valve for compressed air installation
阅读说明:本技术 压缩空气设施的继动阀 (Relay valve for compressed air installation ) 是由 卡尔-海因茨·里迪格-杰尼施 赖纳·霍尔舍 格哈德·马丁尼 于 2019-03-20 设计创作,主要内容包括:本发明涉及一种车辆的压缩空气设施的继动阀(1’),其具有工作压力输入端、工作压力输出端、排气输出端和可控制的继动活塞(19),其中,继动活塞(19)在壳体上部分(3)中可轴向运动地引导并且在轴向端部上具有环形的径向内部的阀座(20),其中存在密封活塞(9),密封活塞与继动活塞(19)同轴地在壳体下部分(2)中可轴向运动地引导,其中,密封活塞(9)被压缩弹簧(8)朝继动活塞(19)并且朝环形的、径向外部的阀座(25)的方向挤压,并且其中,径向外部的阀座(25)是紧固在壳体下部分(2)的环圈(23)中的座圈(24)的组成部分。为了简化其制造而设置的是,座圈(24)是由金属材料构成的锅柱形的深拉构件,并且用于密封活塞(9)的径向外部的阀座(25)构造为轴向凸出的具有尖角形的轴向的横截面的环形接片。(The invention relates to a relay valve (1') of a compressed air system of a vehicle, having a working pressure input, a working pressure output, an exhaust output and a controllable relay piston (19), wherein the relay piston (19) is guided axially movably in a housing upper part (3) and has an annular, radially inner valve seat (20) at an axial end, wherein a sealing piston (9) is present, which is guided axially movably in a housing lower part (2) coaxially to the relay piston (19), wherein the sealing piston (9) is pressed by a compression spring (8) against the relay piston (19) and in the direction of an annular, radially outer valve seat (25), and wherein the radially outer valve seat (25) is a component of a seat ring (24) fastened in a ring (23) of the housing lower part (2). In order to simplify the production thereof, it is provided that the seat ring (24) is a pot-shaped deep-drawn component made of a metallic material, and the radially outer valve seat (25) for sealing the piston (9) is designed as an axially projecting annular web with a pointed axial cross section.)
1. Relay valve (1', 1 ") of a compressed air system of a vehicle, having a working pressure input, a working pressure output, an exhaust gas output and a controllable relay piston (19), wherein the relay piston (19) is guided axially movably in a housing upper part (3) and has an annular, radially inner valve seat (20) at an axial end, wherein a sealing piston (9) is present, which is guided axially movably in a housing lower part (2) coaxially to the relay piston (19), wherein the sealing piston (9) is pressed by a compression spring (8) in the direction of the relay piston (19) and in the direction of an annular, radially outer valve seat (25, 35), and wherein the radially outer valve seat (25, 35) is a seat ring (24, 30) fastened in a ring (23, 30) of the housing lower part (2), 34) Characterized in that the seat ring (24, 34) is a pot-shaped deep-drawn component made of a metallic material, and the radially outer valve seat (25, 35) for sealing the piston (9) is designed as an axially projecting annular web with a pointed axial cross section.
2. Relay valve according to claim 1, characterised in that a valve seat (25, 35) for sealing the outside of the piston (9) is added to the seat ring (24, 34) by pressing.
3. Relay valve according to claim 1 or 2, characterised in that the wall thickness of the seat ring (24, 34) is 0.5mm to 0.8mm, the boundary values being included.
4. Relay valve according to one of claims 1 to 3, characterized in that the seat ring (34) has, for its axial positioning, an axially projecting, annular stop tab (36) radially on the outside, which in the installed state rests against an annular stop flange (31) in the ring (30) of the housing lower part (2).
5. Relay valve according to claim 4, characterized in that the stop tab (36) of the seat ring (34) is configured as an annular tab that is pointed in cross section, which is added to the seat ring (34) by pressing.
6. Relay valve according to one of claims 1 to 5, characterized in that for the axial fixing of the seat ring in the housing lower part (2), the seat ring (24, 34) has spring tongues (26, 37) arranged distributed on the peripheral side on its radial outer edge, which in the mounted state snap behind radially inwardly directed annular webs (28, 32) which are formed on the axial outer edge of the annular ring (23, 30) of the housing lower part (2).
7. Relay valve according to claim 6, characterized in that the spring tongues (26, 37) are formed by a circumferentially distributed arrangement of axial separation slits (27, 38) on the outer edge of the seat ring (24, 34), and in that the separation slits (27, 38) are produced by punching out of the seat ring (24, 34).
8. Relay valve according to one of claims 1 to 7, characterized in that the seat ring (34) has at its outer periphery at least one radially projecting, annular sealing web (39) which, in the installed state, due to a radial interference, bears resiliently sealingly against a cylindrical sealing surface (33) of the housing lower part (2).
9. Relay valve according to claim 8, characterized in that the sealing webs (39) of the seat ring (34) are configured as annular webs with a pointed shape in cross section, which are added to the seat ring (34) by pressing.
10. Relay valve according to claim 8 or 9, characterized in that the sealing web (39) is configured radially outside on the axial end of the seat ring (34) close to the sealing piston.
Technical Field
The invention relates to a relay valve of a compressed air system of a vehicle, having a working pressure input, a working pressure output, an exhaust output and a controllable relay piston, wherein the relay piston is guided axially movably in an upper housing part and has an annular, radially inner valve seat at an axial end, wherein a sealing piston is present, which is guided axially movably in a lower housing part coaxially to the relay piston, wherein the sealing piston is pressed by a compression spring against the relay piston and in the direction of the annular, radially outer valve seat, and wherein the radially outer valve seat is a component of a seat ring which is fastened in a ring of the lower housing part.
Background
Road vehicles, in particular heavy commercial vehicles and rail vehicles, are usually equipped with a compressed air supply facility, the parking brake circuit, the air suspension circuit, the leveling circuit and/or the auxiliary consumer circuit being supplied with compressed air by a compressed air consumer circuit, for example a service brake circuit. In order to modulate the operating pressure of a compressed air consumer of the service brake circuit, for example a wheel brake cylinder, with a relatively small control energy, a relay valve is usually used. The relay valve has a working pressure input connected to a compressed air source, a working pressure output connected to at least one compressed air consumer, and an exhaust output which opens into the environment.
In the type of construction currently considered, the relay valve is provided with a controllable relay piston and a sealing piston. The relay piston is axially movably guided in the housing upper part and has an annular, radially inner valve seat. The sealing piston is axially movably guided coaxially to the relay piston in the housing lower part and is pressed by a compression spring in the direction of the relay piston and the annular, radially outer valve seat. The radially outer valve seat is an integral part of a seat ring which is sealingly fastened in a ring in the housing lower part. Depending on the position of the relay piston and the sealing piston, the working pressure output is alternately connected to the working pressure input or the exhaust output or is isolated with respect thereto. If the relay piston rests with an inner valve seat against the sealing piston and the sealing piston is lifted from an outer valve seat, the working pressure outlet is connected to the working pressure inlet, thereby increasing the working pressure available at the compressed air consumer. If the relay piston is lifted from the sealing piston by its internal valve seat and the sealing piston rests against an external valve seat, the working pressure outlet is connected to the exhaust outlet, thereby reducing the working pressure available at the compressed air consumer. If the relay piston rests with its internal valve seat against the sealing piston and the sealing piston simultaneously rests with its external valve seat, the working pressure output is isolated from the working pressure input and the exhaust output, so that the effective working pressure remains constant at the compressed air consumer.
DE 102006017503 a1 discloses a relay valve in which a relay piston is pneumatically adjustable, in that a pressure chamber delimited by the relay piston can be alternately charged with a high control pressure or with exhaust air via at least one solenoid control valve.
Another relay valve is known from DE 102014016771 a1, in which the relay piston is electromagnetically adjustable, in that an electromagnet, which is arranged coaxially to the relay piston and whose armature is connected to the relay piston, can be acted upon by a control current that is variable with respect to its height and polarity.
Common to both of the aforementioned relay valves is that the valve seat for sealing off the radially outer portion of the piston is part of a seat ring which is embodied as a turned part, preferably made of aluminum, and is mounted in a sealing manner by means of an O-ring in a ring of the housing lower part and is fixed axially there by means of a securing ring which is mounted in an annular groove.
Disclosure of Invention
Since it is relatively complex to produce the seat ring with the radially outer valve seat as a turned part and to fix it in the ring of the housing lower part by means of a fixing ring, the object of the invention is to provide a seat ring with a radially outer valve seat that seals the piston, which can be produced and installed more simply and more inexpensively.
This object is achieved by a relay valve having the features of
The invention therefore relates to a relay valve of a compressed air installation of a vehicle, having a working pressure input, a working pressure output, an exhaust gas output and a controllable relay piston, wherein the relay piston is guided axially movably in a housing upper part and has an annular, radially inner valve seat on an axial end, wherein a sealing piston is present, which is guided axially movably in a housing lower part coaxially to the relay piston, wherein the sealing piston is pressed by a compression spring in the direction of the relay piston and of an annular, radially outer valve seat, and wherein the radially outer valve seat is a component of a seat ring which is fastened in a ring of the housing lower part. In order to solve the stated problem, it is provided in the relay valve that the seat ring is a pot-shaped deep-drawn component made of a metal material, and the valve seat for sealing the radially outer portion of the piston is designed to be axially protruding and pointedAn annular tab of axial cross-section.
The seat ring is preferably made of steel sheet material or aluminium sheet material. In order to achieve sufficient dimensional stability, for example a certain spring elasticity, the wall thickness of the seat ring is in the range from 0.5mm to 0.8mm (limits included).
The seat ring according to the invention can have, for its axial positioning, an annular stop tab which is formed radially on the outside and projects axially and which, in the installed state, rests against an annular stop collar in the ring of the housing lower part.
The stop webs of the seat ring are preferably designed as annular webs that are pointed in cross section and are added to the seat ring by pressing.
For its axial fixation, the race preferably has spring tongues arranged distributed on the circumferential side on its radial outer edge, which spring tongues act in the installed state behind radially inwardly directed annular webs formed on the axial outer edge of the annular ring of the housing lower part. This avoids a fixing groove from being bored out of the housing lower part at the outer edge of the annular ring and a fixing ring from being fitted into this fixing groove, thereby simplifying the fitting of the seat ring.
The spring tongue can be formed in a simple manner by an arrangement of axial separation slots distributed on the peripheral side on the outer edge of the seat ring, wherein the separation slots are produced, for example, by punching from the seat ring
In order to avoid sealing by means of the sealing ring, the seat ring can have at least one radially projecting annular sealing web on its outer circumference for sealing purposes, which in the installed state, due to the radial oversize, rests resiliently sealingly against a cylindrical sealing surface of the housing lower part. The sealing webs of the seat ring are preferably designed as annular webs that are pointed in cross section and are added to the seat ring by pressing.
Drawings
The invention is explained in detail below with reference to two exemplary embodiments shown in the drawings. In the drawings:
FIG. 1 shows, in axial mid-section in section, a relay valve according to a first embodiment of the invention having a seat ring;
FIG. 2 shows, in axial mid-section in section, a relay valve having a second embodiment of a seat ring in accordance with the present invention; and is
Fig. 3 shows a known relay valve of a hitherto conventional embodiment with a seat ring in a sectional axial middle view.
Detailed Description
Fig. 3 shows a hitherto
The
Above the sealing piston 9, a seat ring 14 (sealed by a second O-
A controllable relay piston 19 is guided axially movably on an intermediate guide cylinder 18 of the housing upper part 3, which relay piston is sealed with respect to the housing upper part 3 by means of a third O-
If the relay piston 19 with its
The first embodiment of the relay valve 1' according to the invention, which is depicted in fig. 1, differs from the known embodiment of the
The
The second embodiment of the
The
For sealing between the
By the embodiment according to fig. 1 and 2 as a deep-drawn component made of sheet metal, the production of the
List of reference numerals
1. 1 ', 1' relay valve
2 lower part of the housing
3 upper part of the housing
4 escape opening
5 accommodation on the lower part of the housing
6 guide body
7O-shaped ring
8 compression spring, coil spring
9 sealing piston
10 sealing the first sealing surface of the piston
11 second sealing surface of sealing piston
12 annular space
13 ring in the lower part of the housing
14 seat ring
15 external valve seat, annular web
16O-ring
17 fixed ring
18 guide column
19 relay piston
20 internal valve seat on relay piston
21O-ring
22 intermediate space
23 Ring
24 seat ring
25 external valve seat, annular web
26 spring tongue
27 separation gap
28 annular tab
29O-ring
30 ring
31 stop flange
32 annular tab
33 sealing surface in the lower part of the housing
34 seat ring
35 external valve seat, annular web
36 stop tab, annular tab
37 spring tongue
38 separation gap
39 sealing tab, ring tab