CN202851933U

CN202851933U - Plunger with sealing element

Info

Publication number: CN202851933U
Application number: CN 201220384882
Authority: CN
Inventors: 简国雄
Original assignee: SHENZHEN IMAS MOLD AUTOMATION EQUIPMENT CO Ltd
Current assignee: Imas Automation Precision Industry Dongguan Co ltd
Priority date: 2012-08-03
Filing date: 2012-08-03
Publication date: 2013-04-03
Anticipated expiration: 2022-08-03

Abstract

The utility model relates to a plunger sealed by an expanded sealing element through hydraulic pressure. The plunger with the sealing element comprises a plunger body and a circular sealing element with a V-shaped cross section. The opening direction of the cross section of the sealing element is inward. A circular groove is formed in the outer circle surface of the plunger body. The bottom surface of the circular groove protrudes outside. The sealing element is installed inside the circular groove. The inner surface of the plunger body is attached to the groove bottom surface of the circular groove. A first oil hole is formed in the upper end face or the lower end face of the plunger body. More than one second oil hole is arranged in the middle of the groove bottom surface of the circular groove. Each second oil hole is communicated with the first oil hole. The plunger with the sealing element is capable of automatically compensating pressure and sealing, preventing high pressure oil from flowing to the upper portion of a plunger cylinder through a gap between the plunger cylinder and the plunger, and saving hydraulic energy.

Description

A kind of piston with Sealing

Technical field

The utility model relates to a kind of piston, particularly relates to a kind ofly making Sealing expand to realize the piston that seals by hydraulic coupling.

Background technique

When piston moves in piston cylinder, generally sealing by the O RunddichtringO between piston and the piston in cylinder wall, but for the high operating mode of some seal requests, in piston cylinder, lower square tube high pressure oil at piston, and the top linking springs of piston, make backward stroke of the piston by spring, if use common seal ring, then high pressure oil flows into the top of piston cylinder easily from the gap between piston cylinder and the piston, cause the loss of hydraulic oil, and pollute working environment, if very little with the gap setting of seal ring and piston cylinder casing wall, although can reduce high pressure oil flows into piston cylinder from the gap between piston cylinder and the piston top, but, because the frictional force between seal ring and the piston cylinder casing wall increases, need accordingly larger spring to come overcome friction, make backward stroke of the piston, when piston need to move upward, then need larger hydraulic coupling to overcome the elastic force of spring and the frictional force between seal ring and the piston cylinder casing wall, cause the waste of hydraulic energy.

The model utility content

The technical problems to be solved in the utility model provides a kind of simple in structure, piston with Sealing that cost is low, has the automatic pressure compensation sealing function, can avoid high pressure oil to flow into the top of piston cylinder from the gap between piston cylinder and the piston, save simultaneously hydraulic energy.

A kind of piston with Sealing of the utility model, comprise piston only and Sealing, Sealing ringwise, the section of Sealing is in the shape of the letter V, the opening direction of V font section is inside, offer circular groove on the outer peripheral surface of piston only, the groove bottom of circular groove is projection outwards, Sealing is installed in the circular groove, the internal surface of Sealing and the groove bottom of circular groove fit, upper-end surface or lower end surface at piston only offer the first oilhole, offer at least one second oilhole at the middle part of the groove bottom of circular groove, and each second oilhole all is communicated with the first oilhole.

A kind of piston with Sealing of the utility model, wherein said the second oilhole is four, is evenly distributed on the circumference at groove bottom place of circular groove.

A kind of piston with Sealing of the utility model, wherein said the first oilhole is positioned at the upper-end surface of piston only or the central position of lower end surface.

A kind of piston difference from prior art with Sealing of the utility model is that the utility model is by installing the Sealing that section is in the shape of the letter V at piston only, in use, piston is installed in the piston cylinder, below piston, pass into high pressure oil, the high pressure oil pushing piston moves up, simultaneously, the part high pressure oil enters the second oilhole from the first oilhole, high pressure oil squeeze sealing member by the second oilhole, force it to expand outwardly, thereby force tightening seal, make the sealing between Sealing and the piston cylinder inwall stronger, cunning between the two is joined tightr, avoid high pressure oil to flow into the top of piston cylinder from the gap between piston cylinder and the piston only, reduced the loss of high pressure oil, high pressure liquid force feed pressure release when external equipment, during backward stroke of the piston, the hydraulic oil that acts on the Sealing is realized releasing pressure automatically thereupon, frictional force between Sealing and the piston cylinder inwall reduces, therefore, the spring force that backward stroke of the piston needs is corresponding reducing also, less spring is set can realizes backward stroke of the piston, when moving on the piston, the spring force that need to overcome is also just less, therefore can save hydraulic energy.

The utility model is described in further detail below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is the plan view of a kind of piston with Sealing of the utility model;

Fig. 2 is a kind of plan view with piston only in the piston of Sealing of the utility model;

Fig. 3 is a kind of worm's eye view with piston only in the piston of Sealing of the utility model;

Fig. 4 is a kind of stereogram with piston only in the piston of Sealing of the utility model;

Fig. 5 is a kind of plan view with Sealing in the piston of Sealing of the utility model;

Fig. 6 is a kind of plan view with Sealing in the piston of Sealing of the utility model.

Embodiment

As shown in Figure 1, a kind of piston with Sealing of the utility model comprises piston only 1 and Sealing 2.In conjunction with Fig. 5, shown in Figure 6, Sealing 2 ringwise, the section of Sealing 2 is in the shape of the letter V, the opening direction of V font section is inside, Sealing 2 is made by elastic abrasion-proof material.In conjunction with Fig. 2, shown in Figure 4, offer circular groove 3 on the outer peripheral surface of piston only 1, the groove bottom of circular groove 3 is projection outwards.Sealing 2 is installed in the circular groove 3, and the groove bottom of the internal surface of Sealing 2 and circular groove 3 fits, and offers the central position that the first oilhole 4, the first oilholes 4 are positioned at the lower end surface of piston only 1 in upper-end surface or the lower end surface of piston only 1.In conjunction with shown in Figure 3, offer on the circumference at groove bottom place that 5, four the second oilholes 5 of four the second oilholes are evenly distributed on circular groove 3 at the middle part of the groove bottom of circular groove 3, each second oilhole 5 all is communicated with the first oilhole 4.

A kind of piston with Sealing of the utility model in use, at first it is installed in the piston cylinder 6, be Spielpassung between piston only 1 and the piston cylinder 6, when the lower end of piston cylinder 6 passes into high pressure oil, piston moves up under the promotion of high pressure oil, simultaneously, high pressure oil enters the first oilhole 4, then by four the second oilhole 5 squeeze sealing members 2, force Sealing 2 to expand outwardly, make the outer peripheral surface of Sealing 2 contact tightr with the inwall of piston cylinder 6, make the sealing between Sealing 2 and piston cylinder 6 inwalls stronger, avoid high pressure oil to flow into the top of piston cylinder from the gap between piston cylinder 6 and the piston only 1, reduced the loss of high pressure oil, because the lower end surface of Sealing 2, consisted of a toroidal cavity 7 between the inwall of the bottom surface of circular groove 3 and piston cylinder 6, when high pressure oil upwards flows from the gap between piston cylinder 6 and the piston only 1, can enter toroidal cavity 7 stores, because the mistake oil mass in the gap between piston cylinder 6 and the piston only 1 seldom, after piston stroking upward finishes, high pressure oil can not be full of toroidal cavity 7 yet, flows into the top of piston cylinder from the gap between piston cylinder 6 and the piston only 1 so can further prevent high pressure oil.When the high pressure liquid force feed pressure release of external equipment, backward stroke of the piston, the hydraulic oil that acts on the Sealing 2 is realized releasing pressure automatically thereupon, hydraulic oil in the toroidal cavity 7 also can flow back to fuel tank, frictional force between Sealing 2 and piston cylinder 6 inwalls reduces, and therefore, the spring force that backward stroke of the piston needs is corresponding reducing also, by being set, less spring can realize backward stroke of the piston, when moving on the piston, the spring force that need to overcome is also just less, therefore can save hydraulic energy.

Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.

Claims

1. piston with Sealing, comprise piston only (1) and Sealing (2), it is characterized in that: described Sealing (2) ringwise, the section of Sealing (2) is in the shape of the letter V, the opening direction of described V font section is inside, offer circular groove (3) on the outer peripheral surface of described piston only (1), the groove bottom of described circular groove (3) is projection outwards, described Sealing (2) is installed in the circular groove (3), the groove bottom of the internal surface of Sealing (2) and circular groove (3) fits, upper-end surface or lower end surface at described piston only (1) offer the first oilhole (4), middle part in the groove bottom of described circular groove (3) offers at least one second oilhole (5), and described each second oilhole (5) all is communicated with the first oilhole (4).

2. a kind of piston with Sealing according to claim 1, it is characterized in that: described the second oilhole (5) is four, is evenly distributed on the circumference at groove bottom place of circular groove (3).

3. a kind of piston with Sealing according to claim 2, it is characterized in that: described the first oilhole (4) is positioned at the upper-end surface of piston only (1) or the central position of lower end surface.