Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K15/00—Check valves
  • F16K15/02—Check valves with guided rigid valve members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K15/00—Check valves
  • F16K15/14—Check valves with flexible valve members
  • F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery

Definitions

• the invention relates to a check valve according to the preamble of the main claim.
• check valve is known from DE 33 29 652 AI.
• the known check valve has one
• Disc spring which presses a valve closing body in the middle against a valve seat.
• the valve stroke of the known check valve is not limited, which leads to the disadvantage of a comparatively long closing time and a high load on the disc spring.
• fluid flowing around the valve closing body can excite it to vibrate in the direction of its stroke movement, which leads to undesirable fluctuations in the fluid flow rate, which additionally stresses the disc spring dynamically and can cause flow noise.
• the stroke of the valve closing body and thus its closing time until it is placed on the valve seat after a full opening stroke is limited. Furthermore, the impact of the valve closing body on the valve seat reduced when closing, which reduces the wear of the valve seat and a sealing surface of the valve closing body which bears against it when the check valve is closed.
• the valve stroke limiter also avoids a rebound, that is to say a repeated brief lifting of the valve closing body after being placed on the valve seat when closing.
• the spring travel is limited and the spring is thus protected against high loads, in particular against overload. Vibration excitation of the valve closing body by the fluid flowing around it when the check valve is open is prevented.
• Figure 1 shows an axial section through an inventive check valve
• FIG. 2 shows a view of a valve closing body from FIG. 1 from below;
• Figures 3a to 3c a view of three valve closing springs from above.
• Figure 1 shows a check valve according to the invention, which is integrated as an inlet valve in a piston 10 of a piston pump.
• the piston 10 is guided in a bore 12 of a cylinder 14 so as to be displaceable in the axial direction and by means of a drive (not shown) to and forward movement (arrow f) can be driven.
• the cylinder 14 has a radial bore 16 which communicates via a wide circumferential groove 18 in the outer circumference of the piston 10 and a transverse bore 20 passing therethrough with a blind bore 22 in the piston 10 extending in the axial direction.
• the groove 18 in the piston 10 is so wide that the radial bore 16 in the cylinder 14 opens into the groove 18 at each stroke position of the piston 10 and thereby communicates with the blind bore 22.
• the piston 10 forms a valve housing of the check valve according to the invention.
• a valve closing body 24 is received in the blind bore 22.
• the blind bore 22 leads from a front, annular end face 26 of the piston 10 into the latter.
• the blind bore 22 is stepped, it has an annular shoulder 28 on which it tapers and on which a conical valve seat 30 is formed.
• the valve closing body 24 is a rotationally symmetrical plastic injection molded part. It has a sealing cap 32, which rests on the valve seat 30 when the check valve is closed, and has a sealing surface 32. It continues in one piece into a low cylinder section 34 and merges into a cone 36, the tip 38 of which is rounded.
• the valve closing body 24 has three guide ribs 40 (FIG. 2) that are integral with it, distributed over its circumference, radially projecting and axially parallel, with which it is guided on the bore wall 42 of the blind bore 22 in the piston 10 so as to be axially displaceable.
• the valve closing body 24 produced as an injection molded part made of plastic has, in addition to its simple and quick producibility in one operation, the advantage that it is light and therefore has short opening and closing times with small actuation forces.
• the valve closing body 24 of the check valve according to the invention stands in the center of a disc spring 43. This is attached to the piston 10 in an elastically prestressed manner and presses the valve closing body 24 with its sealing surface 32 against the valve seat 30. At its center, it has a recess 44 for receiving and centering the tip 38 of the valve closing body 24.
• the disc spring 43 is manufactured as a sheet metal stamping. With a small diameter, it can also be produced in an etching process. In this case, it consists, for example, of copper or a copper alloy.
• the peripheral edge 48 of the disc spring 43 is held by a valve stroke limiting part 52 in contact with the annular front end face 26 of the piston 10.
• the valve stroke limiting part 52 has a low hollow cylinder section 54 which engages around a front end 56 of the piston 10.
• a free edge 58 of the hollow cylinder section 54 is deformed into a circumferential groove 60 in the piston 10 so that it engages at its front end 56, and the valve stroke limiting part 52 is connected to the piston 10 in this way.
• the piston 10 is slightly tapered at its front end 56 between the hollow cylinder section 54 of the
• the hollow cylinder section 54 of the valve stroke limiting part 52 merges in one piece into a radially inwardly extending flange 62.
• the disc spring 43 is held by this in contact with the front end face 26 of the piston 10. At two points 64, the circumferential edge 48 of the disc spring 43 is welded to the flange 62 of the valve stroke limiting part 52. By connecting the disc spring 43 to the valve stroke limiting part 52, the disc spring 43 is easy to handle, which is particularly advantageous when assembling the check valve according to the invention if its dimensions are small. Another advantage is that the correct assembly of all parts of the invention
• the valve stroke limiting part 52 has a crosspiece 66 which is integral with it and which, viewed from the blind bore 22 in the piston 10, bulges outward at two diametrically opposite points in the flange 62 of the valve stroke limiting part 52 transforms. Due to its curvature, the transverse web 66 is at a distance in the axial direction from the center of the disc spring 43 when the check valve is closed. The deflection of the disk spring 43 and the stroke of the valve closing body 24 are limited to this distance. Due to the nature of the design of the disc spring 43 and the valve stroke limiting part 52, the required overall height of the check valve according to the invention is small.
• the check valve according to the invention knows through the design of its disc spring 43 and the valve stroke limiting part 52 large flow sections and therefore low flow resistance.
• a leaf spring 67 can be installed in the check valve according to the invention (FIG. 3b). This extends approximately congruently with the transverse web 66 of the valve stroke limiting part 52 and is welded at one end 68 to the flange 62 thereof. Its end 69, which is not welded to the flange 62, rests on the flange 62 and can move in the radial direction on the flange 62 during springing. In the middle, the leaf spring 67 has a recess 70 for the tip 38 of the valve closing body 24.
• a leaf spring 72 can also be installed in the check valve according to the invention, which ends in the center of the valve stroke limiting part 52 (FIG. 3c). Together with an equally non-continuous arm 74 for limiting the valve stroke instead of the crosspiece 66, this results in an even larger fluid passage area.
• An end 75 of the leaf spring 72 resting on the flange 62 of the valve stroke limiting part 52 is welded to the flange 62.
• the leaf spring 72 also has a recess 76 for the tip 38 of the valve closing body 24.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Check Valves (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6536315

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (6)

• 1994
  • 1994-12-20 DE DE4445361A patent/DE4445361A1/de not_active Withdrawn
• 1995
  • 1995-11-22 EP EP95937787A patent/EP0770196A2/de not_active Withdrawn
  • 1995-11-22 WO PCT/DE1995/001624 patent/WO1996019687A2/de not_active Ceased
  • 1995-11-22 KR KR1019960704460A patent/KR970701324A/ko not_active Withdrawn
  • 1995-11-22 JP JP8519401A patent/JPH09509727A/ja active Pending
  • 1995-11-22 CN CN95191710A patent/CN1141669A/zh active Pending

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