CN212429781U - Flexible sealing structure for hydraulic element - Google Patents

Abstract

The utility model relates to a flexible sealing structure for hydraulic element, including sleeve and case, the sleeve adopts split type structure, the sleeve comprises upper sleeve and lower sleeve, form the cavity after upper sleeve and lower sleeve make up, install O type rubber seal and sealing member in the cavity, the sealing member is the annular structure, O type rubber seal overlaps on the external diameter of sealing member, and O type rubber seal's internal diameter is less than the external diameter of sealing member, the cross-section of sealing member is the ladder shape, the height of the inner circle of sealing member is less than its outer circle height; compared with the prior art, the utility model, adopt the combination form design, through the reasonable cooperation to the hydraulic component structure, make its and case valve barrel's line contact hard seal structure combined action, can realize hydraulic component's zero leakage function, promote hydraulic component's performance for hydraulic component can satisfy wider and wider application scenario, and simple structure, easily realizes, and hydraulic component sets up the cavity that holds soft seal structure, and the technology is realized simply.

Description

Flexible sealing structure for hydraulic element

[ technical field ]

The utility model belongs to the technical field of the sealed technique of hydraulic component and specifically relates to a soft seal structure for hydraulic component.

[ background art ]

The matching form of a valve core and a valve sleeve of the existing hydraulic element mostly adopts an economic seat type structure, and the sealing form of the seat type structure is generally line contact hard sealing; when the valve core is applied to a hydraulic system loop, due to the fact that the application working conditions of the hydraulic system are different in complexity, the cleanliness of working media is poor, and the valve core is frequently closed and opened in the valve sleeve, the linear contact hard sealing surface of the valve core and the valve sleeve is abraded in different degrees along with the lapse of time, so that leakage amount of hydraulic oil leaking from a high-pressure side to a low-pressure side is increased when the valve core is closed, and the valve core is not applicable to pressure maintaining occasions and occasions with strict requirements on leakage.

Referring to fig. 1 and 2, a conventional two-way logic valve structure is shown, which mainly comprises a valve core 4, a valve sleeve 5, a cover plate 6 and a spring 7. In a normal state, the valve core is in hard contact with the valve sleeve under the action of the spring, and the projection of the hard contact position is circular, so that a line contact hard sealing structure is realized, and a passage between the valve core B and the valve sleeve A is blocked. When pressure oil passes through the port A or the port B and no pressure oil passes through the port X, the valve core is lifted, and the port A is communicated with the port B. When pressure oil passes through the port X, the valve core is in hard contact with the valve sleeve at a certain pressure and speed to block the passage between the port A and the port B. So, when the case reciprocates for a long time and opens, closes, and the operating mode in addition system circuit differs, and the cleanliness factor of hydraulic oil is bad etc. factor, and the line contact department of case and valve barrel has wearing and tearing of different degrees, leads to the high-pressure hydraulic oil of A mouth or B mouth can the seepage to the low pressure side. When the port A or the port B has long-time pressure maintaining requirement, the valve can not be used.

[ contents of utility model ]

The utility model aims at solving foretell not enough and providing a soft seal structure for hydraulic component, can realize hydraulic component's zero leakage function for hydraulic component can satisfy wider and wider application scenario, and simple structure, easily realization.

Design a soft seal structure for hydraulic element for realizing above-mentioned purpose, including sleeve 3 and case 4, sleeve 3 adopts split type structure, sleeve 3 comprises last sleeve 31 and lower sleeve 32, go up sleeve 31 and form cavity 33 behind the combination of lower sleeve 32, install O type rubber seal 1 and sealing member 2 in the cavity 33, sealing member 2 is the loop configuration, O type rubber seal 1 overlaps on sealing member 2's external diameter, and O type rubber seal 1's internal diameter is less than sealing member 2's external diameter, sealing member 2's cross-section is the ladder shape, 2 inner circles of sealing member highly are less than its outer lane height.

Further, the sealing element 2 is made of a polytetrafluoroethylene composite material.

Further, the valve core 4 is in hard contact with the lower sleeve 32 under the action of an external force, and the projection of the hard contact part is circular.

Further, an oil through hole 34 is radially provided in the lower sleeve 32, the oil through hole 34 communicates with the cavity 33, and the oil through hole 34 is used for introducing hydraulic oil.

Further, the height of the outer ring of the cavity 33 is larger than that of the sealing element 2, but smaller than the diameter of the O-shaped rubber sealing ring 1.

Further, the inner ring height of the cavity 33 is smaller than the outer ring height, and the inner ring height of the cavity 33 is larger than the inner ring height of the seal 2, but smaller than the outer ring height of the seal 2.

Compared with the prior art, the utility model, have following advantage:

(1) the utility model adopts the combination design, through the reasonable matching of the hydraulic component structure, the hydraulic component and the line contact hard sealing structure of the valve core and the valve sleeve act together, the zero leakage function of the hydraulic component can be realized, the performance of the hydraulic component is improved, and the hydraulic component can meet wider and wider application occasions;

(2) the utility model has simple structure and easy realization, and the hydraulic element is provided with the cavity for accommodating the soft sealing structure, so the process is simple to realize;

(3) the sealing element of the utility model adopts the high wear-resistant polytetrafluoroethylene material, the service life is long, and the sealing effect is good;

(4) the utility model discloses a hard seal and soft seal double seal structure can realize hydraulic component's zero leakage function, are applicable to very much the occasion that has long-time pressurize, are worth popularizing and applying.

[ description of the drawings ]

FIG. 1 is a schematic diagram of a conventional two-way logic valve configuration;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

fig. 3 is a schematic view of the soft sealing structure of the present invention;

FIG. 4 is a schematic view of a portion of the structure of FIG. 3;

fig. 5 is a schematic structural diagram of the present invention;

FIG. 6 is an enlarged partial schematic view taken at II in FIG. 5;

FIG. 7 is a second schematic structural view of FIG. 6;

in the figure: 1. the sealing device comprises an O-shaped rubber sealing ring 2, a sealing element 3, a sleeve 31, an upper sleeve 32, a lower sleeve 33, a cavity 34, an oil through hole 4, a valve core 41, an outer diameter 5, a valve sleeve 6, a cover plate 7 and a spring.

[ detailed description of the invention ]

The invention is further described below with reference to the accompanying drawings:

as shown in the accompanying drawings, the utility model provides a flexible sealing structure for hydraulic elements, which comprises a sleeve 3 and a valve core 4, wherein the sleeve 3 adopts a split structure, the sleeve 3 consists of an upper sleeve 31 and a lower sleeve 32, the upper sleeve 31 and the lower sleeve 32 are combined to form a cavity 33, an O-shaped rubber sealing ring 1 and a sealing element 2 are arranged in the cavity 33, the valve core 4 is in hard contact with the lower sleeve 32 under the action of external force, and the projection of the hard contact part is circular; sealing member 2 is the loop configuration, and sealing member 2 adopts polytetrafluoroethylene combined material to make, and O type rubber seal 1 overlaps on sealing member 2's external diameter, and O type rubber seal 1's internal diameter is less than sealing member 2's external diameter, and sealing member 2's cross-section is the ladder shape, and sealing member 2 inner circle height is less than its outer lane height. Wherein, the lower sleeve 32 is provided with an oil through hole 34 in the radial direction, the oil through hole 34 is communicated with the cavity 33, and the oil through hole 34 is used for introducing hydraulic oil; the height of the outer ring of the cavity 33 is greater than that of the outer ring of the sealing element 2, but is smaller than the diameter of the O-shaped rubber sealing ring 1; the inner ring height of the cavity 33 is less than the outer ring height and the inner ring height of the cavity 33 is greater than the inner ring height of the seal 2 but less than the outer ring height of the seal 2.

Soft seal structure, adopt the combination form design, with the hard contact seal structure combined action of case valve barrel, realize hydraulic component's zero leakage function. The soft sealing structure is shown in attached figures 3 and 4 and comprises an O-shaped rubber sealing ring 1 and a sealing element 2, wherein the sealing element 2 is of an annular structure, the cross section of the sealing element is in a step shape, and the sealing element 2 is made of a high-wear-resistance polytetrafluoroethylene composite material; the O-shaped rubber sealing ring 1 is sleeved on the outer diameter of the sealing element 2, and the inner diameter of the O-shaped rubber sealing ring 1 is smaller than the outer diameter of the sealing element 2, so that the O-shaped rubber sealing ring 1 has certain holding force on the sealing element 2.

The soft sealing structure is applied to a hydraulic element and is shown in the attached drawings 5 to 7, in order to be capable of installing the soft sealing structure, the sleeve 3 adopts a split type structure design and consists of an upper sleeve 31 and a lower sleeve 32; the cavity 33 formed by combining the upper sleeve 31 and the lower sleeve 32 is used for mounting a soft sealing structure, the height h of the cavity 33 is larger than the height a of the sealing element 2 but smaller than the diameter of the O-shaped rubber sealing ring 1, so that the sealing element 2 can freely contract in the cavity 33 in a small range, the O-shaped rubber sealing ring 1 has a certain compression amount and can form a sealing effect, the oil through hole 34 is radially arranged on the lower sleeve 32, and the oil through hole 34 is communicated with the cavity 33. The valve core 4 is in hard contact with the lower sleeve 32 under the action of external force, and the projection of the hard contact part is circular, so that a line contact hard sealing structure is realized, and the passage of the oil port A and the oil port B is blocked; the inner diameter of the seal 2 has a small clearance b with the outer diameter 41 of the valve element 4 in normal conditions.

When the oil through hole 34 introduces hydraulic oil, the hydraulic oil extrudes the O-shaped rubber sealing ring 1 to shrink, the O-shaped rubber sealing ring 1 extrudes the sealing element 2 to shrink again, so that the inner diameter of the sealing element 2 is tightly attached to the outer diameter 41 of the valve core 4, and sealing is formed, so that a hard sealing structure and a soft sealing structure are arranged between the oil port A and the oil port B, and the oil way A and the oil way B are enabled to be zero in leakage under the combined action of the two sealing structures. To prevent the seal 2 from being excessively squeezed out of the cavity 33, the front end height c of the cavity 33 is set smaller than the rear end height h but larger than the height d of the seal 2, so that the seal 2 can freely contract in the cavity 33 to a small extent but is not squeezed out of the cavity 33 by an external force. The O-shaped rubber sealing ring 1 has good contractibility, and the compression deformation force can compensate the abrasion of the inner diameter sealing surface of the sealing element 2. The hydraulic oil introduced into the oil through hole 34 can be supplied from the port B and the port A or independently provided with a hydraulic source, but sealing measures are needed to prevent oil leakage among different oil paths.

The present invention is not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and are all included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a soft seal structure for hydraulic element, includes sleeve (3) and case (4), its characterized in that: sleeve (3) adopt split type structure, sleeve (3) comprise last sleeve (31) and lower sleeve (32), go up sleeve (31) and down behind sleeve (32) the combination vacuole formation (33), install O type rubber seal (1) and sealing member (2) in cavity (33), sealing member (2) are the loop configuration, O type rubber seal (1) overlaps on the external diameter of sealing member (2), and the internal diameter of O type rubber seal (1) is less than the external diameter of sealing member (2), the cross-section of sealing member (2) is the ladder shape, sealing member (2) inner circle height is less than its outer lane height.

2. A flexible seal structure for hydraulic components according to claim 1, wherein: the sealing element (2) is made of a polytetrafluoroethylene composite material.

3. A flexible seal structure for hydraulic components according to claim 1, wherein: the valve core (4) is in hard contact with the lower sleeve (32) under the action of external force, and the projection of the hard contact part is circular.

4. A flexible seal structure for hydraulic components according to claim 1, wherein: the radial direction of lower sleeve (32) is provided with oil through hole (34), oil through hole (34) and cavity (33) communicate with each other, oil through hole (34) are used for introducing hydraulic oil.

5. A soft seal structure for a hydraulic component according to claim 1 or 4, wherein: the height of the outer ring of the cavity (33) is greater than that of the outer ring of the sealing element (2) but smaller than the diameter of the O-shaped rubber sealing ring (1).

6. A flexible seal structure for a hydraulic component according to claim 5, wherein: the height of the inner ring of the cavity (33) is smaller than that of the outer ring, and the height of the inner ring of the cavity (33) is larger than that of the inner ring of the sealing element (2) but smaller than that of the outer ring of the sealing element (2).

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