CN100387879C

CN100387879C - Non-return valve

Info

Publication number: CN100387879C
Application number: CNB200480007023XA
Authority: CN
Inventors: 布赖恩·J·凯恩
Original assignee: Bosch Rexroth AG
Current assignee: Bosch Rexroth AG
Priority date: 2003-03-20
Filing date: 2004-03-19
Publication date: 2008-05-14
Anticipated expiration: 2024-03-19
Also published as: DE502004010109D1; ATE443826T1; DE10316230B4; CN1761830A; DE10316230A1

Abstract

A non-return valve is disclosed, comprising a sealing piston (4), pre-tensioned against a valve seat (18) in the rest position in a valve housing (8), which is produced by means of a plastic injection moulding method.

Description

One-way valve

Technical field

The present invention relates to a kind of one-way valve.

Background technique

One-way valve is used for occluding pressure oil flowing on a direction also can make volume flow in the opposite direction.

This one-way valve has disclosed in claimant's document RD 20 395/10.95.In this regard, through-flow metal seat valve piston be in the valve housing and on initial position to the pre-tensioning of valve seat, thereby the pressure oils between two work connecting tubes connect on the blocking-up through-flow direction.

The shortcoming of this open solution is, the processing charges that is used to make the metal seat valve piston is very high.

In addition, the shortcoming of this open solution is serious blow-by tendency.

Shortcoming in addition is, the metal seat valve piston very heavy and therefore this one-way valve show a kind of quite blunt switching capacity.

Summary of the invention

The object of the present invention is to provide a kind of one-way valve, this one-way valve can be eliminated above-mentioned shortcoming and make inexpensively.

According to the valve seat piston of one-way valve of the present invention by plastic injection-moulded manufactured.What this solution had advantage is can processing technique simply and inexpensively to make according to valve seat piston of the present invention.In addition, quite soft according to the frosting of valve seat piston of the present invention, thus can guarantee sealing highly.In addition, be very light in weight according to the feature of valve seat piston of the present invention, one-way valve shows a kind of switching capacity of sensitivity thus.

Preferred plastics are Poly-Ether-Ether-Keton (PEEK), preferably add 30% carbon fiber for the rigidity the inside of improving the valve seat piston.

The valve seat piston is discharged side directed, wherein, adds the gap for reducing to lag behind on its excircle.Preferably retaining shaft is to connecting sheet between the gap, and its guide surface is soaked by the pressure oil in the spring housing and valve seat piston the best is led.In one embodiment, six gaps have six connecting sheets that are in therebetween.

On open position, pressure oil can flow in the spring housing by star-shaped aperture.For the guiding of improving the valve seat piston and in order to reinforce, between the hole of star-shaped aperture, can constitute guide protrusion part.Guide protrusion part is preferably triangle and adverse current is tapered to pressure formation direction, and wherein, its axial length preferably is equivalent to the internal diameter in hole.The best through flow cross section that the internal diameter in hole and quantity are looked is separately selected.Preferably have four holes.

For avoiding pressure oil stream to form eddy current on open position, the valve seat piston can have the circular cone that becomes a mandarin at input side.The circular cone that becomes a mandarin can have top rounding or hemispheric.

A kind of preferred embodiment in, be used for the spring seat that the spring of pre-tensioning valve seat piston is being made of plastics equally at the initial position upper support.Preferably spring seat has at least one sealing lip radially on its excircle, thereby spring housing is hermetically enclosed.Equally, on the end face of spring seat, can constitute at least one sealing lip.If the contrary pressure of radial seal lip constitutes the direction setting and the end face seal lip is arranged on the pressure formation direction, can obtain extra high sealing so.

Description of drawings

By accompanying drawing a preferred embodiment of the present invention is elaborated below.Wherein:

Fig. 1 illustrates the side view according to a kind of mode of execution of one-way valve of the present invention; And

Fig. 2 illustrates the longitudinal section of Fig. 1 one-way valve.

Embodiment

Fig. 1 and 2 illustrates the side view and the amplification longitudinal section that has through-flow valve seat piston 4 according to the preferred implementation of direct controlling non-return valve 2 of the present invention, and this valve seat piston is in vertical hole 6 of valve housing 8.Vertically hole 6 is being used to connect the coaxial attachment hole 10 of input side work connecting tube A and is discharging between the coaxial attachment hole 12 of connecting plate 14 in the vertical hole 6 of sealing of side work connecting tube B and extend.Valve seat piston 4 by spring 16 on its initial position to valve seat 18 pre-tensionings.Spring 16 is arranged in the spring housing 20, and is bearing on the spring seat 22 in the vertical hole 6.In this regard, this spring sinks to the receiving hole 24 interior (Fig. 2) of valve seat piston 4 and acts on the annular bottom surface 26 of receiving hole 24.

Valve seat piston 4 according to the present invention by the injection moulding manufacturing.It is by the plastics manufacturing and can utilize carbon fiber to reinforce.Preferably select Poly-Ether-Ether-Keton (PEEK) and utilize 30% carbon fiber reinforcing as plastics.Valve seat piston 4 constitutes as box type piston, and wherein, receiving hole 24 is radially tapered on valve seat piston 4 becomes a mandarin the direction of side 68.The hole 54 of star-shaped aperture 52 feeds in this taper position 70.Therefore, enter in the valve seat piston 4 by valve seat 18 from hole 54 and flow in the spring housing 20 of refluxing chamber side at open position upward pressure oil.For improving flow characteristic, hole 54 tilts in pressure formation direction and feeds in the taper position 70.The shape and the quantity in hole 54 are selected like this, make the through flow cross section optimization in hole 54.Preferably have four holes 54.

For making pressure oil stream evenly, on the side 68 that becomes a mandarin of valve seat piston 4, constitute the circular cone 56 that becomes a mandarin.The circular cone 56 that becomes a mandarin carries out the transition to hemispheric top 64, and wherein, the circumferential surface 72 at top 64 is than the more precipitous setting of circumferential surface of the circular cone 56 that becomes a mandarin.

Valve seat piston 4 is radial directed on the discharge side in vertical hole 6, wherein, for avoiding valve seat piston 4 one-sided guiding and therefore minimizing hysteresis in vertical hole 6, in its excircle 46, have substantial radial gap 48, thereby valve seat piston 4 guides on the bottom 76 in gap 48 by single axial connecting sheet 50 that gap 48 is separated each other and narrow annular beam 62.

Open and finger-like is becoming a mandarin and extends on the direction of circular cone 56 to spring housing 20 in bag shape gap 48.The quantity in gap 48 is optimization under the situation of considering connecting sheet 50 circumference guide surfaces 66 width.Best six gaps 48 have six connecting sheets 50.

Annular beam 62 carries out the transition in the axial leg-of-mutton guide protrusion part 58 at the direction superinverse stream of the circular cone 56 that becomes a mandarin.Guide protrusion part 58 is tapered on the direction of the extension and the circular cone 56 that becoming a mandarin between the hole 54.In this regard, the axial length of guide protrusion part 58 is preferred to be selected like this, makes this length be equivalent to the internal diameter in hole 54 substantially.In the zone of guide protrusion part 58, valve seat piston 4 has the interior identical external diameter in zone of and connecting sheet 50 interior with the zone of annular beam 62, thereby valve seat piston 4 vertically lead by guide protrusion part 58 in the hole 6 equally, and so axially directed length and with the corresponding prolongation of extending axially of guide protrusion part 58.In addition, by guide protrusion part 58 is arranged between the hole 54,, hole 54 obtains reinforcing owing to making this zone of valve seat piston 4 structural weaks.

Spring seat 22 is made of plastics, and these plastics preferably are softer than the plastics of valve seat piston 4.Spring seat is packed in the step 28 that radially resets in vertical hole 8, and by with the axially locating on its position that contacts of connecting plate 14.The axial length of step 28 of resetting is selected like this, and the

apparent surface

30,32 who makes connecting plate 14 and valve housing 8, and only contacts connecting plate 14 each other apart under installment state with spring seat 22, thereby this spring seat is pressed to the convex shoulder 74 of the step 28 that resets.For pressure oil can being discharged from spring housing 20, vertical hole 6 of one of formation and valve housing 8 and the through hole 34 coaxial spring seat 22 in the attachment hole 12 of connecting plate 14.

On the excircle 42 of spring seat 22, has the sealing lip 36 that is used for respect to connecting plate Packing spring chambers 20 14.Sealing lip 36 distributions parallel to each other are also passed through circular groove 38 formation.The longitudinal axis tilt distribution in sealing lip 36 and vertical hole 6, wherein, sealing lip constitutes direction from the contrary pressure of bottom land 60 findings of circular groove 38 and is installed on the direction of valve seat 18.The advantage that this and soft plastic combination tilt distribution down has is, sealing lip 36 is holded up automatically or installed by pressure oil, and so presses on the inner circumference 40 of the step 32 that resets in vertical hole 6.Be the discharge side attachment hole 12 of the plate 14 that is tightly connected, end face has at least one sealing lip 44, it and vertically hole 6 inclinations, but constitute on the direction with the radial seal lip 36 opposite pressure that are installed in, thereby it can be holded up or installs by the pressure of head pressure oil.

, obviously reduced processing charges and therefore can make valve seat piston 4 with low cost and apace with plastic injection-moulded manufactured by valve seat piston 4.

In addition, the frosting quite soft by valve seat piston 4 can be pressed into the pollutant that is in the pressure oil and for example be deposited on the valve seat 18 in the valve seat piston 4, reaches the sealing of height.

In addition, use plastics can obviously be lighter than known metal seat valve piston by foundation valve seat piston 4 of the present invention and constitute, thereby show a kind of improved switching capacity according to one-way valve 4 of the present invention.This switching capacity is further improved by the gap 48 on valve seat piston 4 excircles 46, wherein, has prolonged the axially directed length of valve seat piston 4 connecting sheets 50 by guide protrusion part 58.In addition, improve valve seat piston 4 and under open mode, can improve current drainage by valve seat 18 because pressure oil the best becomes a mandarin by the circular cone 56 that becomes a mandarin according to the switching capacity of one-way valve 2 of the present invention.

Self-evident, although above-mentioned mode of execution introduction is a kind of two axially one-way valves of work connecting tubes that have, can axially and in the one-way valve of the connecting tube of radially working use having one equally according to valve seat piston 4 of the present invention.

Disclose a kind of one-way valve, had on the initial position in valve housing to the pre-tensioned valve seat piston of valve seat, this valve seat piston is by plastic injection-moulded manufactured.

Reference numeral

2 check valves

4 valve seat pistons

6 longitudinal holes

8 valve housings

10 attachment holes

12 attachment holes

14 connecting plates

16 springs

18 valve seats

20 spring housing

22 spring seats

24 receiving holes

26 bottom surfaces

28 steps that reset

30 surfaces

32 surfaces

34 through holes

36 sealing lips

38 circular grooves

40 inner circumferences

42 excircles

44 sealing lips

46 excircles

48 gaps

50 connecting sheets

52 star-shaped aperture

54 holes

56 circular cones that become a mandarin

58 guide protrusion part

60 bottom lands

62 annular beam

64 tops

66 guide surfaces

68 sides that become a mandarin

70 taper positions

72 circumferential surfacies

74 convex shoulders

76 bottoms

Claims

1. one-way valve, have hollow valve seat piston (4), this piston is in the valve housing (8) and at initial position and passes through spring (16) to the pre-tensioning of valve seat (18), thereby be controlled at two work connecting tube (A on the through-flow direction at initial position, B) pressure oil between connects, it is characterized in that, valve seat piston (4) is by plastic injection-moulded manufactured, wherein valve seat piston (4) has star-shaped aperture (52), hole (54) by this star-shaped aperture can make the pressure oil on the open position flow in the spring housing (20), wherein between the hole (54) of described star-shaped aperture, constitute guide protrusion part (58), guide protrusion part (58) triangle constitute and go on the flow path direction tapered.

2. by the described one-way valve of claim 1, wherein, valve seat piston (4) is made by the PEEK plastics.

3. by claim 1 or 2 described one-way valves, wherein, valve seat piston (4) utilizes 30% carbon fiber reinforcing.

4. by the described one-way valve of claim 1, wherein, valve seat piston (4) has a large amount of gap (48) on excircle (46), thereby valve seat piston (4) is directed in vertical hole (6) of valve housing (8) by the axial connecting sheet (50) that gap (48) are separated each other.

5. by the described one-way valve of claim 1, wherein, the hole of described star-shaped aperture (54) are four.

6. by the described one-way valve of claim 4, wherein, described gap (48) are that the hole (54) of six and described star-shaped aperture is four.

7. by the described one-way valve of claim 1, wherein, guide protrusion part (58) has an axial length separately, and this axial length roughly is equivalent to the internal diameter in the hole (54) of described star-shaped aperture.

8. by the described one-way valve of claim 1, wherein, valve seat piston (4) has the circular cone of becoming a mandarin (56).

9. by the described one-way valve of claim 8, wherein, the circular cone that becomes a mandarin (56) has the top (62) of rounding.

10. by the described one-way valve of claim 1, wherein, spring (16) is by the supporting of the plastics spring seat (22) in the valve housing (8).

11. by the described one-way valve of claim 10, wherein, spring seat (22) has at least one sealing lip (36,44) on its excircle (42) and/or end face.

12. by the described one-way valve of claim 11, wherein, the contrary pressure of the radial seal lip (36) on the excircle (42) of spring seat (22) constitutes direction to be installed, end face seal lip (44) constitutes direction along pressure and installs.