CN210623238U - Internal leakage prevention hydraulic cartridge valve connecting seat sealing structure - Google Patents

Abstract

The utility model provides a prevent interior hydraulic pressure cartridge valve connecting seat seal structure, including hydraulic pressure cartridge valve, the connecting seat, the end cover, hydraulic pressure cartridge valve, connecting seat and end cover pass through double-end fastening bolt fixed connection, be equipped with first piston in the hydraulic pressure cartridge valve, be equipped with the second piston in the connecting seat, be equipped with the connecting rod on the second piston, the one end and the first piston contact of second piston are kept away from to the connecting rod, hydraulic pressure cartridge valve is equipped with first hydraulic fluid port subassembly with the junction of connecting seat, be equipped with the second hydraulic fluid port subassembly on the connecting seat, first hydraulic fluid port subassembly is through first oil circuit and the inside intercommunication of connecting seat, the second hydraulic fluid port subassembly passes through the inside intercommunication of second oil circuit and connecting seat, be equipped with. By adopting the structure, the hydraulic cartridge valve is convenient to install, common in accessories, strong in adjustability, low in cost, strong in applicability, good in pressure pulsation and pressure alternation resistance, and capable of prolonging the service life of other machines connected with the hydraulic cartridge valve, such as a pressure oil pump and electromechanical equipment.

Description

Internal leakage prevention hydraulic cartridge valve connecting seat sealing structure

Technical Field

The utility model relates to a seal structure field, especially a leak hydraulic pressure cartridge valve connecting seat seal structure in preventing.

Background

The hydroelectric generating set is often influenced by factors such as a hydraulic structure, a water conduit, rotational inertia of the set and the like, and the guide vane servomotor of the adjusting system is required to have a multi-section closing rule characteristic when the guide vane servomotor is closed emergently. The sectional closing device can realize different unit closing rules according to the setting of the position of the inflection point. At present, the domestic hydroelectric generating set generally adopts a three-section closing rule, and the closing time of the second section and the third section is generally realized by adjusting a screw rod of an adjusting section closing device. The three-section closing rule after calculation and verification is guaranteed through adjustment, and the influence of the 'water hammer' of the draft tube can be reduced to the maximum extent under the conditions that the unit is stopped and the rotating speed is reduced rapidly.

For example: during the standby period of a 5F unit of a hydraulic power station of a home dam, the pressure oil pump is frequently started and loaded, the oil temperature is obviously increased, the internal leakage of the speed regulating system is increased, and the internal leakage shows large difference in different guide vane opening degrees. And then, other 7 machine sets are checked, and the phenomena that the pressure oil pump is frequently loaded and the oil temperature rises are common are found. For finding out the internal leakage reason, the pressure test is carried out on hydraulic cartridge valves such as speed regulation system accident pressure distribution valves, isolating valves and sectional closing valves, and the more serious internal leakage phenomenon of the sectional closing valves is found, and the specific reason is that: when the opening degree of the movable guide vane of the unit changes, the auxiliary piston on the right side of the section closing valve controls the oil pipe to frequently switch an oil way, the pressure conditions on two sides of the left O-shaped sealing ring of the connecting seat are variable and bear irregular alternation and pulse pressure changes, the sealing ring is repeatedly stretched and bent and generates permanent deformation, and finally a snake shape is formed, so that the inner leakage of the section closing valve is caused. The connecting seat of the high-pressure and large-flow hydraulic cartridge valve is sealed, and because the two sides of the connecting seat need to bear alternately changed pressure and pulse pressure, if an O-shaped sealing ring is selected, the hydraulic cartridge valve can leak in after bending deformation, and the frequent loading of a pressure oil pump can cause the accelerated aging of electromechanical equipment and the increase of energy consumption; abnormal increase of the oil temperature can lead to accelerated deterioration speed and shortened service life of the turbine oil.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a sealing structure of a connecting seat of a hydraulic cartridge valve for preventing internal leakage, which is convenient to install, has common accessories, strong adjustability and lower cost; the applicability is strong, the hydraulic cartridge valve is suitable for connection sealing of medium-high pressure and large-flow hydraulic cartridge valves, and the performance of resisting pressure pulsation and pressure alternation is good; the dumbbell-shaped sealing element made of the polyurethane material can work stably in turbine oil for a long time without deformation, distortion and cracking, and the service life of other machines connected with the hydraulic cartridge valve, such as a pressure oil pump and electromechanical equipment, is prolonged.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a prevent interior hydraulic pressure cartridge valve connecting seat seal structure, including hydraulic pressure cartridge valve, the connecting seat, the end cover, hydraulic pressure cartridge valve, connecting seat and end cover pass through double-end fastening bolt fixed connection, be equipped with first piston in the hydraulic pressure cartridge valve, be equipped with the second piston in the connecting seat, be equipped with the connecting rod on the second piston, the one end and the first piston contact of second piston are kept away from to the connecting rod, hydraulic pressure cartridge valve is equipped with first hydraulic fluid port subassembly with the junction of connecting seat, be equipped with the second hydraulic fluid port subassembly on the connecting seat, first hydraulic fluid port subassembly is through first oil circuit and the inside intercommunication of connecting seat, the second hydraulic fluid port subassembly passes through the inside intercommunication of second oil circuit and connecting seat, be equipped with.

In a preferred scheme, the end cover is provided with an adjusting rod, and the adjusting rod is in contact with the second piston.

In a preferred scheme, the sealing element is a dumbbell-shaped sealing element, and two ends of the sealing element are completely contacted with the inner wall of the sealing groove.

In the preferred scheme, the number of the seal grooves is not less than two, and the seal grooves are uniformly distributed on the left side and the right side of the first oil way.

In a preferred embodiment, the sealing member is made of polyurethane.

The utility model provides a prevent interior hydraulic pressure cartridge valve connecting seat seal structure that leaks through adopting above-mentioned structure, has following beneficial effect:

(1) the dumbbell-shaped sealing element made of polyurethane can work stably in turbine oil for a long time without deformation, distortion and cracking, and the service life of other machines connected with the hydraulic cartridge valve, such as a pressure oil pump and electromechanical equipment, is prolonged;

(2) the applicability is strong, the hydraulic cartridge valve is suitable for connection sealing of medium-high pressure and large-flow hydraulic cartridge valves, and the performance of resisting pressure pulsation and pressure alternation is good;

(3) the whole structure is simple and reasonable, the installation is convenient, the accessories are common, the adjustability is strong, the cost is low, and the practicability is strong.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a cross-sectional view of the overall structure of the present invention.

Fig. 2 is a schematic view of the connecting seat structure of the present invention.

Fig. 3 is a detailed view of the structure of the sealing groove of the connecting seat of the present invention.

In the figure: the hydraulic cartridge valve comprises a hydraulic cartridge valve 1, a connecting seat 2, an end cover 3, a first piston 4, a first oil way 5, a second oil way 6, a first oil port assembly 7, a second oil port assembly 8, a second piston 9, a sealing element 10, an adjusting rod 11 and a sealing groove 12.

Detailed Description

As shown in fig. 1-3, an internal leakage prevention hydraulic cartridge valve connecting seat sealing structure comprises a hydraulic cartridge valve 1, a connecting seat 2 and an end cover 3, wherein the hydraulic cartridge valve 1, the connecting seat 2 and the end cover 3 are fixedly connected through a double-headed fastening bolt 14, a first piston 4 is arranged in the hydraulic cartridge valve 1, a second piston 9 is arranged in the connecting seat 2, a connecting rod 13 is arranged on the second piston 9, one end, away from the second piston 9, of the connecting rod 13 is in contact with the first piston 4, a first oil port assembly 7 is arranged at the joint of the hydraulic cartridge valve 1 and the connecting seat 2, a second oil port assembly 8 is arranged on the connecting seat 2, the first oil port assembly 7 is communicated with the inside of the connecting seat 2 through a first oil path 5, the second oil port assembly 8 is communicated with the inside of the connecting seat 2 through a second oil path 6, a plurality of sealing grooves 12.

In a preferable scheme, the end cover 3 is provided with an adjusting rod 11, and the adjusting rod 11 is in contact with the second piston 9. The adjusting rod 11 is convenient to control the overall moving stroke of the first piston 4, the second piston 9 and the connecting rod 13, so that the device is more rapid and convenient, and has strong practicability.

In a preferred embodiment, the sealing member 10 is a dumbbell-shaped sealing member, and both ends of the sealing member 10 are in full contact with the inner wall of the sealing groove 12. The dumbbell-shaped sealing element and the end that links that seal groove 12 contacted are the smooth surface, can be more stable when sealing element 10 receives uneven pressure, reduce the possibility of deformation, and the practicality is strong.

In a preferred embodiment, the number of the seal grooves 12 is not less than two, and the plurality of seal grooves 12 are uniformly distributed on the left and right sides of the first oil path 5. The sealing effect is improved, and the uneven pressure is more uniformly endured.

In a preferred embodiment, the sealing member 10 is made of polyurethane. The polyurethane material is convenient for production and shaping, and has wide adjustable range of performance, strong wear resistance, large mechanical strength, good elasticity, good oil resistance and moderate price.

The utility model discloses a use method does: in actual work, the sealing element 10 on the left side of the first oil path 5 bears the influence of pressure change of a main oil cavity in the hydraulic cartridge valve 1, the second piston 9 is controlled to move left and right through the matching of the first oil port assembly 7 and the second oil port assembly 8, the pressures of the first oil path 5 and the second oil path 6 are alternately switched under zero pressure and working pressure, and the right side of the sealing element 10 on the left side of the first oil path 5 bears the alternate switching of the zero pressure and the working pressure from the first oil port assembly 7;

because the sealing element 10 is dumbbell-shaped, two end planes of the sealing element 10 are abutted against the inner wall of the sealing groove 12, so that the state of the sealing element 10 in the sealing groove 12 is stable, and the sealing element 10 can stably work without deformation, distortion or breakage under the conditions of long-time bearing of pressure pulsation and pressure alternation on two sides.

The utility model has the advantages that: the installation is convenient, the accessories are common, the adjustability is strong, and the cost is lower; the applicability is strong, the hydraulic cartridge valve is suitable for connection sealing of medium-high pressure and large-flow hydraulic cartridge valves, and the performance of resisting pressure pulsation and pressure alternation is good; the dumbbell-shaped sealing element made of the polyurethane material can work stably in turbine oil for a long time without deformation, distortion and cracking, and the service life of other machines connected with the hydraulic cartridge valve, such as a pressure oil pump and electromechanical equipment, is prolonged.

Claims (5)

1. The utility model provides a leak hydraulic pressure cartridge valve connecting seat seal structure in preventing, includes hydraulic pressure cartridge valve (1), connecting seat (2), end cover (3), its characterized in that: the hydraulic cartridge valve (1), connecting seat (2) and end cover (3) are through double-end fastening bolt (14) fixed connection, be equipped with first piston (4) in hydraulic cartridge valve (1), be equipped with second piston (9) in connecting seat (2), be equipped with connecting rod (13) on second piston (9), the one end and first piston (4) contact of second piston (9) are kept away from in connecting rod (13), hydraulic cartridge valve (1) is equipped with first hydraulic fluid port subassembly (7) with the junction of connecting seat (2), be equipped with second hydraulic fluid port subassembly (8) on connecting seat (2), first hydraulic fluid port subassembly (7) are through first oil circuit (5) and connecting seat (2) inside intercommunication, second hydraulic fluid port subassembly (8) are through second oil circuit (6) and connecting seat (2) inside intercommunication, be equipped with a plurality of seal grooves (12) on connecting seat (2), be equipped with sealing member (10) in seal groove (12).

2. The internal leakage prevention hydraulic cartridge valve connecting seat sealing structure according to claim 1, characterized in that: the end cover (3) is provided with an adjusting rod (11), and the adjusting rod (11) is in contact with the second piston (9).

3. The internal leakage prevention hydraulic cartridge valve connecting seat sealing structure according to claim 1, characterized in that: the sealing element (10) is a dumbbell-shaped sealing element, and two ends of the sealing element (10) are completely contacted with the inner wall of the sealing groove (12).

4. The internal leakage prevention hydraulic cartridge valve connecting seat sealing structure according to claim 1, characterized in that: the number of the sealing grooves (12) is not less than two, and the sealing grooves (12) are uniformly distributed on the left side and the right side of the first oil path (5).

5. The internal leakage prevention hydraulic cartridge valve connecting seat sealing structure according to claim 1, characterized in that: the sealing element (10) is made of polyurethane.

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