CN2377402Y

CN2377402Y - Ceramic and metal composite piston

Info

Publication number: CN2377402Y
Application number: CN 99226867
Authority: CN
Inventors: 叶诚钧
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-01
Filing date: 1999-06-01
Publication date: 2000-05-10
Anticipated expiration: 2009-06-01

Abstract

The utility model relates to an improvement on the traditional piston. The utility model mainly aims to eliminate the radial pressure of a piston ring on the cylinder wall and improve the conversion efficiency of the energy. A piston body is hollow, and the corresponding position of the piston body is provided with a piston pin hole. The exterior of the piston body is sheathed with a piston sleeve which is made of high-hardness and high-temperature resistant non-metallic material. The outer surface of the piston sleeve is processed into high fine finish. The piston sleeve is matched with screw threads of an upper flange through the upper end of the piston body. The piston sleeve is firmly sheathed on the exterior of the piston body.

Description

The piston of pottery and metallic combination

The utility model belongs to the engineering part of mechanical field, particularly to the improvement of piston.

Traditional piston is metal cylinder, and is generally made of aluminum, and the relative position of its hollow respectively is shaped on piston pin hole, and cylinder top has the multiple tracks annular groove, and the opening piston ring that elastic metallic is made snaps in these annular grooves.During work, utilize the sealing of piston ring that piston is compressed air, and scrape back the machine oil on the casing wall.Because piston is axially reciprocating in cylinder, at first must overcome the radial pressure of piston, so that this part energy consumption becomes idle work to casing wall, reduced the function conversion efficiency.According to measuring and calculating, the frictional work of piston accounts for about 50% of whole mechanical losses.Although people notice this problem already, be to wait to have captured a difficult problem always.

The purpose of this utility model provides a kind of piston of eliminating piston when operation to the casing wall radial pressure, thereby improves the function conversion efficiency.

Realize that the purpose of this utility model is based on the principle that all can produce seal action between two article of the closely connected cooperation of any energy.Traditional piston ring also is based on this principle, because if anchor ring degree of finish is not enough, no matter piston ring has much elastic force, still can produce leakage, thereby the piston ring technology may not be an optimum scheme.

The relative position of the hollow of the utility model piston respectively is shaped on piston pin hole, and has following feature:

The metal piston body upper and lower end is shaped on lower protruding edge respectively, and one of them and piston body are made one, and the other end forms by being threaded, and Ceramic piston overlaps between last lower protruding edge.

Have annular groove on the anchor ring of upper flange, can embed sealer in the groove,, play airtight booster action and knife-type oil stripping action as asbestos yarn.

Each can place a thin packing ring between Ceramic piston cover and the last lower protruding edge, so that piston sleeve cooperates with piston body is more firm, the while is also played airtight booster action.Above-mentioned piston sleeve can be installed realization at interval by a plurality of ring-type bodies.

The piston that utilizes the utility model to make has the following advantages:

Owing to cancelled piston ring, eliminated its radial pressure to casing wall, the function conversion ratio obviously improves, and has reduced energy consumption, and energy-saving benefit is great.

Make the piston sleeve of high finishingness owing to adopt high hardness nonmetallic material such as pottery or glass, wear-resisting property also obviously improves, eliminated the scratch (be commonly called as scuffing of cylinder bore) of conventional piston ring simultaneously to casing wall, can prolong machine maintenance cycle and operating life exponentially, also reduced operating cost, particularly if the cylinder cylinder sleeve that also adopts the high hardness nonmetallic material to make, then wear resistance can further increase substantially.

In the accompanying drawing, Fig. 1 is the utility model one example structure schematic representation, and Fig. 2 is the worm's eye view of piston body among Fig. 1.

Be described further below in conjunction with accompanying drawing.

Embodiment adopts the engineering ceramics porcelain to make tubular shape piston sleeve 5, and its outer surface carries out high finishingness processing, has high hardness, resistance and high temperature resistance property.Hollow radially relative position is shaped on piston body 6 cast and the fine finishing moulding of piston pin hole 1, and its upper end is shaped on screw thread, and the lower end is shaped on flange 8, and the metal ring that upper flange 2 is shaped on screw thread by inner ring surface and is engaged in piston body 6 upper ends constitutes.During installation, at first tube-shaped piston cover 5 is placed in piston body 6 and seat on lower protruding edge 8, then upper flange 2 is screwed in fastening the getting final product in piston body 6 upper ends.

In order to improve frizing effect to casing wall, can open annular groove one at upper flange 2 outer ring surfaces, can embed resistant to elevated temperatures asbestos yarn 3 in the groove.

For steadiness and the tightness that improves piston sleeve 5, can between piston sleeve 5 and last lower protruding edge 2 and 3, respectively place a thin asbestos washer 4 and 7, also available asbestos yarn embeds.

Claims

1, the piston of a kind of pottery and metallic combination, the relative position of metal piston body (6) hollow respectively is shaped on a piston pin hole (1), it is characterized in that being with a pottery outside the piston body (6) makes the piston sleeve of high smooth surface (5).

2, piston according to claim 1, it is characterized in that metal piston body (6) upper and lower end is shaped on upper flange (2), lower protruding edge (8) respectively, one of them and piston body (6) are made one, the other end forms by being threaded, and Ceramic piston cover (5) is positioned between upper and lower flange (2), (8).

3, piston according to claim 2 is characterized in that having annular groove on upper flange (2) anchor ring, can embed sealer (3) in the groove, such as asbestos yarn.

4,, it is characterized in that each can place a thin packing ring (4), (7) between tube-shaped piston cover (5) and the last lower protruding edge according to claim 2 or 3 described pistons.

5, piston according to claim 1 is characterized in that piston sleeve (5) can install realization at interval by a plurality of ring-type bodies.