JP4118474B2 - Directional control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a directional control valve for controlling a double-acting consumer in particular, and has a casing in which valve slider devices that can be adjusted and moved between at least two switching positions are mutually connected. Having two valve sliders arranged in separate slider holes, which are arranged parallel to each other in the casing, each of which can be simultaneously loaded by one piston .
[0002]
Such a directional control valve is already known from DE 19 509 578 A1. This known directional control valve comprises a single valve slider, which is movably guided in a slider bore. The valve slider is relatively thin and has a plurality of piston sections axially spaced on the outer peripheral surface. These piston sections control the pressure medium connection between the pressure medium chambers provided in the casing of the direction control valve. These pressure medium chambers are connected to an external pressure medium source, a storage tank, or a consumer via a connecting portion. This known directional control valve is a five-port two-position directional control valve with five connections and two possible switching positions for the valve slider.
[0003]
The disadvantage of this five-port two-position directional control valve is that the overall length is relatively long and the casing is relatively expensive to be able to guide the valve slider with as little friction as possible. Is that you need. Furthermore, the assembly cost is expensive due to the large number of parts of the directional control valve.
[0004]
[Problems to be solved by the invention]
The object of the invention is to ensure that the directional control valve has a particularly compact and simple structure.
[0005]
[Means for Solving the Problems]
In order to solve this problem, in the configuration of the present invention, in the directional control valve of the type described first, the two valve sliders are provided by a seal and a constricted portion that are arranged so that the mutual distance in the axial direction is different. The respective work connection portions and the supply passage or the return passage are controlled so that the work connection portions are alternately connected to the return passage or the supply passage in each switching movement of the valve slider.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Advantageous embodiments of the invention are as described in claim 2 and the subsequent claims.
[0007]
【The invention's effect】
The directional control valve according to the present invention consists of only a few parts, can be easily assembled and can be manufactured at low cost. In the directional control valve according to the present invention, control can be performed so that the pressure media in the work connection portion do not mix with each other, and the passage for guiding the pressure media is almost circular, and has a very high pressure resistance. It is also possible to constitute a 4-port 3-position type directional control valve.
[0008]
【Example】
In the following, the configuration of the present invention will be specifically described based on the embodiments shown in the drawings.
[0009]
The directional control valve 10 shown in the drawing has a casing 12 consisting of two casing parts 14, 16 in the form of a block. Both casing parts 14, 16 are in contact with each other along the separation plane 17 and are connected to each other by screws. For this purpose, a through-receiving hole 18 for a screw (not shown) is formed in the first casing part 14, and a screw hole 20 in the form of a bag hole is formed in the second casing part 16. . Two mutually parallel slider holes 22, 24 are formed in each of the casing parts 14, 16 in a direction perpendicular to the separation plane 17. These slider holes 22, 24 are open toward the separation plane 17, are coaxially overlapped with each other when the casing 12 is assembled, and are separated from each other by a common intermediate wall 26. The slider holes 22, 24 are reduced in diameter at right angles at the end opposite to the separation plane 17, and then open into common cutouts 28, 29 in the direction toward the outer surface of the casing 12. The notches 28 and 29 face each other on both sides in the axial direction of the slider holes 22 and 24 and are closed to the outside by a closing plate 30.
[0010]
Each casing part 14, 16 further comprises a pressure medium passage 32, 34 extending parallel to the separation plane 17. These pressure medium passages 32, 34 intersect with both slider holes 22, 24 and end in a bag hole shape inside the casing 12. The pressure medium passages 32, 34 open at the opposite ends into the work connection portions 36, 38 of the directional control valve 10 configured as a plug connection portion. The work connections 36 and 38 can be connected to a double-acting pressure medium consumer by a conduit (not shown).
[0011]
Supply and discharge of the pressure medium to and from the directional control valve 10 is effected by a supply passage 42 or a return passage 40, each one of these passages being formed in one of the casing parts 14,16. In the assembled state of the casing 12, the supply passage 42 or the return passage 40 opens into the slider holes 22 and 24 between both the pressure medium passages 32 and 34. In the illustrated embodiment, the supply passage 42 and the return passage 40 extend at right angles to the separation plane 17, so that only the open cross section of these passages is visible in the slider holes 22, 24. Therefore, the connection portion of the supply passage 42 or the return passage 40 and the work connection portions 36 and 38 of the direction control valve 10 are arranged on the outer surfaces of the casing 12 adjacent to each other.
[0012]
In the illustrated passage arrangement, one receiving hole 18 in the first casing part 14 intersects a pressure medium passage 32 formed in this casing part. The pressure loss from the pressure medium passage 32 is avoided by a fixing screw inserted into the receiving hole 18, and the fixing screw comes into close contact with the casing portion 14 with a sealing action at the screw head.
[0013]
Prior to the coupling of both casing parts 14, 16, a ring 44 is pushed into the slider holes 22, 24 at the inner end of the intermediate wall 26. These rings 44 are thereby respectively located between one of the working connections 36, 38 of the directional control valve 10 and the supply passage 42 or the return passage 40, and the inner chamber of the directional control valve is divided into a plurality of pressure chambers 45. is doing. In order to control the pressure medium connection between these individual pressure chambers 45, two valve sliders 48, 49 are provided, which are movably arranged in the axial direction in the slider holes 22, 24. Has been. Both valve sliders are cylindrical members whose outer diameter is matched to the inner diameter of the ring 44. The valve sliders 48 and 49 include an annular seal 46 and two constricted portions 47 arranged so as to have different axial distances. The seal 46 and the constriction 47 are pressures between the individual pressure medium chambers 45 by interaction with the ring 44 and in relation to the axial position of the valve sliders 48, 49 in the slider holes 22, 24. Open the media connection or close tightly.
[0014]
The valve sliders 48 and 49 are operated by the pistons 50 and 51, and these pistons are slidably guided in the notches 28 and 29 on opposite sides. These pistons 50 and 51 have, for example, circular pressure surfaces 50a and 51a and guide sections 50b and 51b arranged at right angles to the pressure surfaces 50a and 51a, respectively. The pistons 50 and 51 are provided with seal cuffs 52 on their pressure surfaces 50a and 51a. Therefore, cylinders 53 and 54 are formed between the closing plate 30 and the pistons 50 and 51, and these cylinders are illustrated. It can be loaded with pressure medium in a form that is not. Via the pressure level in the cylinders 53, 54, the pistons 50, 51 are arranged in one of these cylinders 53, 54, and the inner surface of the closing plate 30 and one pressure surface 50 a, 51 a of the pistons 50, 51, It can be operated against the force of the pressing spring 55 supported by the. The guide sections 50b, 51b of the pistons 50, 51 facing the inside of the casing 12 are in contact with the end faces of the valve sliders 48, 49 with their end faces. The movement of the piston is therefore transmitted directly to both valve sliders 48, 49, so that these valve sliders move in parallel and in the same direction from their rest position to the switching position or vice versa.
[0015]
In the drawing, the directional control valve 10 is shown in a switching position in which the piston 51 of the casing part 16 is in its outer terminal position. In this switching position, the cylinder 53 of the piston 50 facing each other has no pressure, and the push spring 55 is compressed to the maximum. In this case, the valve sliders 48 and 49 have the return passage 40 connected to the first work connection portion 36 via the pressure medium passage 32, while the supply passage 42 is connected to the second work passage 36 via the pressure medium passage 34. It is in a position connected to the work connection unit 38. The pressure load on the cylinder 53 of the piston 50 and the accompanying pressure discharge from the cylinder 54 of the other piston 51 cause a switching process, in which case the valve sliders 48 and 49 have the return passage 40 connected to the second working connection. The supply passage 42 is connected to the portion 38 and moved to a position where it is connected to the first work connection portion 36. Accordingly, the work connection portions 36 and 38 are alternately connected to the supply passage 42 or the return passage 40 in each switching movement of the direction control valve 10.
[0016]
The direction control valve 10 is connected to the work connecting portions 36, 38 by appropriately determining the distance between the constricted portions 47 of the valve sliders 48, 49, or by the relative positions of the constricted portions 47 of both valve sliders 48, 49. So that the medium to or from the work connection does not mix, in other words, so that no pressure medium connection occurs between both work connections 36, 38 during the switching process. It is possible to configure. Similarly, by appropriately configuring the valve sliders 48 and 49, a third neutral position of the directional control valve 10 located between the aforementioned two switching positions is provided, in which both work connections are provided. It is also possible for the pressure medium flow from 36, 38 or to both working connections 36, 38 and the pressure medium flow from the supply connection 42 or to the return passage 40 to be blocked. Let's go.
[0017]
Of course, the embodiments described above can be further modified or supplemented without departing from the basic idea of the invention. The basic idea of the present invention is essentially that the valve sliders 48 and 49 are configured in pairs so that no pressure medium connection occurs between both working connections, especially at low cost and in a small required space. The directional control valve 10 is configured. This basic idea can be applied in the same way to hydraulic directional control valves and pneumatic directional control valves. In order to operate this directional control valve, all known possibilities such as electrical, electromagnetic, mechanical, pneumatic or hydraulic operating devices can be considered, The pressure medium controlled operations 50 and 51 are merely selected as examples. It should be emphasized that when the casing 12 is made of plastic by injection molding, the direction control valve 10 can be manufactured at a particularly low cost. That is, it is possible to provide more connection parts than the two connection parts 36, 38, 40, 42.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a directional control valve according to the present invention.
[Explanation of symbols]
10 direction control valve, 12 casing, 14, 16 casing part, 17 separation plane, 18 receiving hole, 20 thread hole, 22, 24 slider hole, 26 intermediate wall, 28, 29 notch, 30 closing plate, 32, 34 Pressure medium passage, 36, 38 work connection, 40 return passage, 42 supply passage, 44 ring, 45 pressure chamber, 46 seal, 47 constriction, 48, 49 valve slider, 50 piston, 50a pressure surface, 50b guide section, 51 piston, 51a pressure surface, 51b guide section, 52 seal cuff, 53, 54 cylinder, 55 push spring

Claims (9)

In particular, a directional control valve (10) for controlling a double-acting consumer, comprising a casing (12), in which a valve slider device is adjustable and movable between at least two switching positions. location is Propelled by one from each other separate slider hole (22, 24) two valve slider which is disposed within the (48, 49), these valve spool (48, 49) within the casing (12) have been arranged parallel to each other, in what at the same time the load enable der Ru format by each one piston (50, 51),
The two valve sliders (48, 49) are each switched by the seal (46) and the constricted portion (47), which are arranged so as to be spaced apart from each other in the axial direction. Each of the work connection portions (36, 38) and the supply passage (42) or the return passage so that the work connection portions (36, 38) are alternately connected to the return passage (40) or the supply passage (42). A directional control valve characterized by controlling the passage (40) . The operating device has a pair of piston / cylinder units (50, 51, 53, 54) which are on opposite sides of the valve slider device and are operated with a pressure medium. 2. Directional control valve according to claim 1, characterized in that the valve slider (48, 49) is loaded in common. The casing (12) consists of two casing parts (14, 16) joined together by a fixing element, the separating plane (17) between these casing parts (14, 16) being a slider hole (22, The directional control valve according to claim 1 or 2, characterized in that it extends at right angles to 24). Pressure medium passages (32, 34) and supply passages (42) or return passages (40) leading to the work connections (36, 38) open into the slider holes (22, 24) at least approximately at right angles. The directional control valve according to any one of claims 1 to 3, wherein 5. Each of the casing parts (14, 16) has one of the work connections (36, 38) and a supply passage (42) or a return passage (40). The direction control valve according to any one of the above. At least one of the fixing elements connecting the casing parts (14, 16) to one another passes through one of the pressure medium passages (32, 34) leading to the working connection (36, 38). The direction control valve according to any one of claims 1 to 5. The directional control valve according to any one of claims 1 to 6, wherein the directional control valve is a four-port two-position directional control valve for pressurized air. A supply passage (42) and a return passage (42) open into the slider holes (22, 24) between the two working connections (36, 38) in the axial direction of the valve slider (48, 49). The directional control valve according to claim 1, wherein the directional control valve is provided. 9. Directional control valve according to claim 1, characterized in that both casing parts (14, 16) can be made ready for assembly by injection molding and are made of plastic. .

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