DE102017002499A1 - Reed valve arrangement - Google Patents

Abstract

The invention relates to a pneumatic lamellae valve assembly (1), comprising a valve plate (12) with at least one valve opening (13) and with one of these valve opening (13) associated with the valve plate (12) fixed elastic valve blade (14) which between one Valve opening (13) covering the closed position and a valve opening (13) releasing opening position is adjustable. According to the invention, provision is made in the valve lamella (14) for a throttle opening (18) which is arranged in that area which, in the closed position of the valve lamella (14), covers the valve opening (13) of the valve plate (12). As a result, the multi-disk valve arrangement has the function of a throttle check valve, which allows a flow flow in one direction unhindered and throttled in the other direction.

Description

The invention relates to a pneumatic lamellae valve assembly comprising a valve plate having at least one valve opening and associated with this valve opening, attached to the valve plate elastic valve lamella, which is adjustable between a valve opening covering the closed position and a valve opening releasing this opening position.

Lamella valves are among the so-called shut-off valves, which block a fluid flow in a closing direction and release in the opposite direction. Within the category of check valves, a distinction is generally made between simple check valves, pilot operated check valves and throttle check valves. Lamella valves are previously known only as simple check valves and in use. They have proven to be very simple and inexpensive solutions, especially in pneumatic engineering as structurally and manufacturing technically, which also require a relatively small installation space. Their simple structure results, inter alia, from the fact that the elastic valve blade assumes both the function of a blocking body and the function of a spring loading the locking body in the direction of the closed position.

Unlockable check valves and throttle check valves, however, are so far not represented with the concept of the lamella valves. In particular, typical throttle check valves of known design require in addition to a formed within a valve housing main fluid passage in which the usually loaded by a separate spring, cooperating with a valve seat, for example, conically shaped locking body is adjustable, also a parallel thereto, bypassing the main channel side channel, the one has comparatively small throttle cross-section. Such valves are therefore structurally relatively expensive and expensive.

Against this background, the present invention seeks to make a comparison with conventional throttle check valves structurally simpler multi-plate valve so that it can also take over the function of a throttle check valve.

The solution of this problem arises from the features of the main claim, while advantageous embodiments and further developments of the invention are the dependent claims can be removed.

The invention is based on the finding that throttle check valves could in principle be considerably simplified if it is possible to arrange a throttle cross-section, which is effective in the closed position, in the main channel or main flow path of the fluid, so that a secondary channel is no longer required. This possibility offers a multi-valve with the features of the invention, as will be explained below.

Accordingly, the invention is based on a pneumatic multi-disc valve arrangement, comprising a valve plate with at least one valve opening and with a valve opening associated with this, attached to the valve plate elastic valve blade, which is adjustable between a valve opening covering the closed position and this valve opening releasing opening position.

To achieve the object, it is provided in this lamella valve arrangement that in the valve lamella a throttle opening is formed, which is arranged in the region which covers the valve opening of the valve plate in the closed position of the valve lamella.

In the open position of the valve lamella this is so far lifted from the valve opening, that the fluid can flow through them unhindered, wherein the throttle opening formed in the valve lamella remains ineffective. In the closed position of the valve lamella, the valve opening is basically completely covered by the valve lamella, but at the same time the throttle opening formed in the valve lamella is effective. Accordingly, in the embodiment according to the invention, the valve lamella, in addition to the function of a blocking body and a spring loading the blocking body in the direction of the closed position, also has the function of a throttle, resulting overall in an extremely simple and inexpensive construction.

When using the blade valve assembly according to the invention, for example, in the control of a pneumatic actuator piston drive is provided that the throttle opening is designed as a throttle bore with a bore diameter between 1 mm and 0.5 mm, preferably 0.8 mm. It has been shown that with such a throttle cross-section, an advantageous, sufficient damping effect for the piston movement can be achieved, as will be explained with reference to an embodiment.

A preferred embodiment of the invention is characterized by a double-acting valve blade, which is fastened in its center region to the valve plate and whose two ends are each associated with a valve opening formed in the valve plate. Since two valves can be designed in this way with a single valve lamella element, both in terms of Parts inventory as well as the assembly effort considerable advantages.

• 1 eine perspektivische Schnittansicht eines als Drosselrückschlagventil ausgebildeten Lamellenventils,
• 2 in einer Draufsicht eine Ventilplatte mit mehreren als Drosselrückschlagventilen ausgebildeten Lamellenventilen, und
• 3 einen pneumatischen Stellantrieb als typisches Anwendungsbeispiel für Drosselrückschlagventile in der Form eines Ersatzschaltbildes.

The invention can be further explained by means of exemplary embodiments. For this purpose, the description is accompanied by a drawing. In this shows

• 1 a perspective sectional view of a throttle valve designed as a flap valve,
• 2 in a plan view of a valve plate having a plurality of throttle valves designed as flap valves, and
• 3 a pneumatic actuator as a typical application example of throttle check valves in the form of an equivalent circuit diagram.

1 shows a schematic representation of a trained as a throttle check valve assembly 2 pneumatic blade valve assembly 1 with a first pressure chamber, for example connected to one side of an actuating piston arrangement 4 and a second pressure chamber connected to other control components 6 , And with a arranged between these lamellar valve 8th , This consists essentially of one on one of the two pressure chambers 4 . 6 connecting flow channel 10 resting valve plate 12 in which a passage opening 13 is formed for the flowing fluid, further on the valve plate 12 resting, in the illustrated closed position, the passage opening covering elastic valve lamella 14 as well as a rigid catcher 16 , the swing-up path of the valve lamella 14 limited in opening direction.

The operation of the lamella valve 2 is as follows: With an overpressure in the first pressure chamber 4 raises in 1 from bottom to top flowing fluid the valve lamella 14 from the valve plate 12 so that it can flow unhindered. At an overpressure in the second pressure chamber 6 becomes the valve lamella 14 to the valve plate 12 pressed so that a fluid flow in the 1 from top to bottom can not be done.

The according to the invention in the valve lamella 14 trained small throttle opening 18 however, allows this throttle opening depending on the cross-sectional area 18 a more or less throttled flow from the first pressure chamber 6 in the second pressure chamber 4 so that the valve assembly 2 has the function of a throttle check valve.

2 shows a conventional valve plate 20 , on the two double-acting valve blades 22; 24 are attached. As the 2 can be seen, the two valve blades 22; 24 each in its central region on the valve plate 20 attached, each with both free ends 26 . 28 ; 30 . 32 the valve blades 22 ; 24 each one formed in the valve plate 20 valve opening 60 . 62 . 64 . 66 assigned. In the area of the free ends 26 ; 28 the first valve lamella 22 is in each case a throttle opening 34 ; 36 trained while in the free ends 30 . 32 the second valve lamella 24 also each a throttle opening 38 ; 40 available.

3 shows a pneumatic actuator as a typical application example of throttle check valves of the type described. The two cylinder chambers 44 ; 46 a pneumatic cylinder 48 are each with a throttle check valve 50 ; 52 connected for a drain-side throttling. You have the task, the speed of movement in the pneumatic cylinder 48 sliding piston 54 and the attached piston rod 56 set. The one from the cylinder rooms 44 or 46 outgoing compressed air is via the throttle function of the associated throttle check valve 50; 52 throttled, while the other cylinder space incoming compressed air flows unthrottled through the associated throttle check valve. Thus, the main counterforce that the incoming air must overcome is the backpressure in front of the restrictor for the outflowing air, so that it determines the piston movement rather than a static friction of the piston in the cylinder, which makes the piston movement less stick-slip-endangered.

As a throttle cross-section, for example, has designed as a throttle bore with a bore diameter between 1 mm and 0.5 mm, preferably 0.8 mm designed throttle opening, which is attached in the case of the present invention in a simple manner to the valve lamella.

LIST OF REFERENCE NUMBERS

1

Pneumatic slat valve arrangement

2

Restrictor check valve assembly

4

First pressure room

6

Second pressure chamber

8th

reed valve

10

flow channel

12

Valve plate (first example)

13

Valve opening in the valve plate

14

valve blade

16

catcher

18

throttle opening

20

Valve plate (second example)

22

First valve lamella

24

Second valve lamella

26

End of valve lamella 22

28

End of valve lamella 22

30

End of valve lamella 24

32

End of valve lamella 24

34

First throttle opening

36

Second throttle opening

38

Third throttle opening

40

Fourth throttle opening

42

Pneumatic actuator

44

First cylinder space

46

Second cylinder space

48

pneumatic cylinder

50

First throttle check valve

52

Second throttle check valve

54

piston

56

piston rod

60

First valve opening in the valve plate 20

62

Second valve opening in the valve plate 20th

64

Third valve opening in the valve plate 20th

66

Fourth valve opening in the valve plate 20

Claims (4)

A pneumatic multi-disc valve assembly (1) comprising a valve plate (12; 20) having at least one valve opening (13; 60,62,64,66) and a valve plate associated with one of said valve openings (13; 60,62,64,66) (12; 20) fixed elastic valve blades (14; 22,24) which between a valve opening (13; 60,62,64,66) covering the closed position and one of these valve opening (13; 60,62,64,66) releasing Opening position is adjustable, characterized in that in the valve blade (14; 22, 24), a throttle opening (18; 34, 36, 38, 40) is formed, which is arranged in that region which in the closed position of the valve blade (14; 22, 24) covers the valve opening (13, 60, 62, 64, 66) of the valve plate (12, 20). Lamella valve arrangement according to Claim 1 , characterized in that the throttle opening (18; 34, 36, 38, 40) as a throttle bore with a bore diameter between 1 mm and 0.5 mm, preferably 0.8 mm is formed. Lamella valve arrangement according to Claim 2 , characterized in that the throttle opening (18; 34, 36, 38, 40) is designed as a throttle bore with a bore diameter of 0.8 mm. Slat valve arrangement according to one of Claims 1 to 3 characterized by a double-acting valve blade (22, 24) which is fixed in its center region on the valve plate (20) and whose two free ends (26, 28, 30, 32) in each case one in the valve plate (20) formed valve opening (20) 60, 62, 64, 66) are assigned.

Images