CN1140484A

CN1140484A - Pump piston

Info

Publication number: CN1140484A
Application number: CN 95191556
Authority: CN
Inventors: 克劳斯·齐默尔·福豪斯
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-11
Filing date: 1995-11-13
Publication date: 1997-01-15
Also published as: CA2180939A1; WO1996015371A1

Abstract

A pump piston (1) comprises a cup-shaped body (2). The piston (1) is reciprocated in a cylinder to pump liquids. The side wall (3) of the piston (1) is configured to allow the side wall (3) to expand during the pump discharge stroke to seal against the cylinder. The side wall (3) could be tapered from the base (4) to the free end (6), or have spiral cuts (7, 8, 9) from the free end (6) to adjacent the base (4), which are angled radially outwardly and away from the free end (6), or vertical cuts (20) which are substantially tangential to the inner surface of the cup-shaped body (2).

Description

The piston of pump

The present invention relates to be used for the piston of pump and especially for the piston of water pump.

The piston of pump is along the piston cylinder to-and-fro motion, and requirement seals between the sidewall of piston in cylinder wall and piston.This sealing is adopted usually around the form of the piston ring of piston outer wall setting.The present invention attempts to provide a kind of piston with integral sealing means.

A kind of form widely is, the present invention includes the piston of a pump, and it is suitable for pumping in piston cylinder (draw and send) liquid, and it comprises:

A goblet of making by flexible (elasticity) material, this goblet has one and extends from the bottom and at the sidewall of free end with the flange ending, wherein, above-mentioned sidewall is so constructed, so that sidewall dilates during discharging (discharging) stroke, seal thereby pasting piston cylinder.

Another kind of form is, the present invention includes the piston of a pump, and it is suitable for pumping liquid, and it comprises:

A goblet of being made by flexible material, this goblet have one from the bottom extension and at the sidewall of free end with the flange ending; And

At least one penetrates the otch that side-wall material is extended, and it originates in the flange of sidewall and spirals towards hypanthial bottom around sidewall, thereby forms a kind of seal arrangement, and its radially outward during discharging stroke moves, so that is pasting the piston cylinder sealing.

The present invention now is illustrated with reference to the accompanying drawings for example, wherein:

Fig. 1 represents the perspective view of piston according to an embodiment of the invention;

Fig. 2 shows the sectional view of the middle branch of piston shown in Figure 1;

Fig. 3 shows the phantom of the sidewall of piston shown in Figure 1;

Fig. 4 shows the side view of piston shown in Figure 1;

Fig. 5 shows the planimetric map of above drawing illustrated embodiment, the motion of the seal arm that expression is amplified;

Fig. 6 shows the sectional view same with Fig. 3, but represents the situation during the pump pressure stroke;

Fig. 7 shows further embodiment of the present invention;

Fig. 8 shows the cross-sectional view of an alternative embodiment of the invention;

Fig. 9 shows the perspective view of an alternative embodiment of the invention;

Figure 10 shows the planimetric map of piston shown in Figure 9;

Figure 11 shows a two-way ram according to another embodiment of the invention;

Generally show with 12 and to be used for the utensil of cutting auger otch, and

Figure 13 shows the further view of utensil shown in Figure 12.

The piston of pump (1) shown in Fig. 1 to 6, is made of a goblet (2), has had the sidewall (3) of from the bottom (4).A center hole (5) passes bottom (4), so that accommodate the driveshaft (not shown); Make piston to-and-fro motion in piston cylinder.Be provided with three otch (7,8 and 9) around the flange (6) of sidewall (3), these otch penetrate sidewall (3) fully and extend.Each otch (7,8 and 9) spiral to the bottom (4) of adjacency from flange (6), shown in Fig. 2 and 4, and as shown in Figure 3, these otch (7,8 and 9), can need not to be this angle shown in Fig. 3 and 6 with any suitable inclination angle outwards and towards the direction of leaving flange (6) angle that tilts.

During use, otch (7,8 and 9) forms sealing valve (10,11 and 12), these valve as illustrated in Figures 5 and 6 during the release stroke of pump radially outward be rotated away from piston (1), this is because the effect of the axial vector (13) of hydrodynamic pressure and vector (14) directly.The cut surface (16) of the cut surface (15) of piston door (10) in sidewall (3) goes up slides and the formation sealing.

Shown in Fig. 1 and 5, these valve overlap mutually, thus this seal action that helps the flexible of these valve and help them.Otch 7a-7b extends about 160 ° around piston (1), and the peak 8a of the backward next otch 8a-8b of minimum point 7b is about 45 ° simultaneously.Repeat this pattern around piston (1), preferably the angle of these otch is about 5 °.But any suitable staggered or overlap joint can use, and this depends on the material of structure.

The present invention is applicable to two-way ram shown in Figure 7 (17), and wherein the structure of valve is identical with previous embodiment.

Another embodiment is shown in Fig. 8, and wherein piston (18) has the sidewall (19) to flange (6) taper (coming to a point).The material of structure selects to have proper flexibility, sidewall can outwards be dilated so that pasting the piston in cylinder wall sealing during the pump pressure stroke.

The modification of the piston of Fig. 8 is shown in Fig. 9 and 10, has wherein processed vertical incision (20) in some positions around sidewall (19).These otch (20) are tangent with the internal surface (21) of sidewall (19) basically.Therefore in pump pressure or during discharging intermediate range, so the valve (22) that forms mutually the crosscut leading thread constitute sealing to outside slip and between piston cylinder and them itself.

Two-way ram cylinder (23) is shown in Figure 11, and its structure is identical with the mode of Fig. 9 and 10.

According to the material of structure, for example material can be any suitable plastics resemble the high density poly propylene, and any amount of otch can be arranged, and from 1,2 or the like up, realizes sealing, as long as these valve demonstrate the flexible degree of requirement.

The utensil of the helical cuts of the piston shown in the working drawing 1 to 7 is shown in Figure 12 and 13.This utensil comprises the slitting wheel horse (23) with some blades (24).Piston pair pin (25) is positioned at the central authorities of these blades.Piston blank (26) is sliding to be contained on the alignment pin (25), and alignment pin then is engaged in the center hole (5) of piston blank (26).Piston blank (26) is towards the direction rotation of arrow 27, and blade (24) then cuts out helical cuts (7,8 and 9).

Should be understood that for those skilled in the art, need not depart from scope and spirit of the present invention and just can make an amendment and change aforesaid these embodiments.

Claims

1. piston that is suitable for the pump of pumping liquid in piston cylinder, it comprises:

A goblet of being made by flexible material, this goblet have one from the bottom extension and at the sidewall of free end with the flange ending; Wherein above-mentioned sidewall is so constructed, so that this sidewall dilates during discharging stroke, seals thereby pasting piston cylinder.

2. the piston of a pump, it comprises:

The otch that at least one material that penetrates sidewall extends, it originates in the flange of sidewall and spirals towards hypanthial bottom around sidewall, forms seal arrangement, and sealing device radially outward during discharging stroke moves, thereby is pasting the piston cylinder sealing.

3. according to the piston of the pump of claim 2, wherein, at least one otch radially outward and tilt towards leaving hypanthial free-ended direction.

4. according to the piston of the pump of claim 3, wherein, at least one otch radially outward and with about 5 ° angle and to leave hypanthial free-ended direction and tilt.

5. according to the piston of the pump of any one in the claim 2 to 4, wherein have many otch, these otch are staggered around sidewall, form the valve of adjacent overlap joint.

6. according to the piston of the pump of claim 5, wherein there are 3 otch.

7. piston that is suitable for the pump of pumping liquid in piston cylinder, it comprises:

A goblet of being made by flexible material, this goblet have from the bottom extension and at the sidewall of free end with the flange ending; Wherein, above-mentioned sidewall toward the flange taper, so that sidewall dilates, thereby is pasting the piston cylinder sealing from the bottom during discharging stroke.

8. according to the piston of the pump of claim 7, it further comprises a plurality of axial cut-outs, and these otch are around hypanthial circumference, and extend the bottom from flange toward adjacency, and tangent with inside surface of side wall basically.

9. the piston of the pump of any one in requiring according to aforesaid right, wherein the material of structure is a high density poly propylene.

10. according to any one the piston of pump of aforementioned claim, wherein this piston is a double action.

11. with reference to the accompanying drawings Fig. 1 to 6 basically, Fig. 7, Fig. 8, Fig. 9 and 10, or the piston of the described pump of Figure 11.