Pressure-maintaining single-acting hydraulic manual mechanism

Abstract

The present invention relates to a pressure-maintaining single-acting hydraulic manual mechanism, comprising an integrally formed hydraulic cylinder, an oil tank and a manual hydraulic pump, one end of the oil tank is communicated with the interior of an oil chamber on a cylinder barrel of the hydraulic cylinder through a through hole of the hydraulic cylinder, the other end of the oil tank is communicated with an inner hole of the manual hydraulic pump, the inner hole of the manual hydraulic pump is communicated with a plunger oil chamber through a communicating hole, a rotating valve core and a soft sealing structure abutting against each other are arranged inside the manual hydraulic pump, and the interior of the manual hydraulic pump is also communicated with an oil chamber below the cylinder barrel; an oil pressure check valve and an oil suction check valve are respectively arranged on the inner side of the rotating valve core, and the pressure maintaining and oil draining positions of the hydraulic manual mechanism are realized by changing the position of the rotating valve core relative to the soft sealing structure and opening and closing the oil pressure check valve or the oil suction check valve; the oil pressure check valve and the oil suction check valve of the manual hydraulic pump in the present invention are arranged in the opening of the rotating valve core, and by arranging the soft sealing structure, the handle of the rotating valve core can be rotated to enable the manual hydraulic pump to realize the oil pressure, pressure maintaining and pressure draining positions.

Description

Technical Field

[0001] The invention relates to the field of hydraulic components, in particular to a pressure-maintaining single-acting hydraulic manual mechanism with a self-resetting actuator. Background Art

[0002] Hydraulic manual mechanisms are gradually being used in valve products in various industries due to their easy operation. However, the expansion of the use of hydraulic manual mechanisms is affected by problems with the setting of the oil tank, the connection of the pipelines, and the difficulty in achieving zero leakage in the hard-sealed one-way valve of the manual hydraulic pump. Summary of the invention

[0003] In view of the above existing problems, the applicant has conducted research and improvement, and provided a pressure-maintaining single-acting hydraulic manual mechanism, which has the characteristics of compact structure, small oil tank volume and excellent pressure-maintaining effect.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A pressure-maintaining single-acting hydraulic manual mechanism comprises an integrally formed hydraulic cylinder, an oil tank and a manual hydraulic pump, one end of the oil tank being connected to the interior of an oil chamber on a cylinder barrel of the hydraulic cylinder through a through hole of the hydraulic cylinder, the other end of the oil tank being connected to an inner hole of a manual hydraulic pump through an oil circuit, the inner hole of the manual hydraulic pump being connected to a plunger oil chamber provided with a manual pump plunger through a connecting hole, a rotating valve core and a soft sealing structure abutting each other are arranged inside the manual hydraulic pump, the interior of the manual hydraulic pump is also connected to an oil chamber below a cylinder barrel through another oil circuit; an oil pressure check valve and an oil suction check valve are respectively arranged in the opening at the inner end of the rotating valve core, the pressure-maintaining and oil-draining positions of the hydraulic manual mechanism are realized by changing the position of the rotating valve core relative to the soft sealing structure and opening and closing the oil pressure check valve or the oil suction check valve; the oil pressure position of the hydraulic manual mechanism is realized by driving the manual pump plunger of the manual hydraulic pump to open the oil pressure check valve.

[0006] Its further technical solution is:

[0007] The inner hole of the manual hydraulic pump includes an inner step hole for installing the rotary valve core and a floating oil cavity for floating the soft sealing structure. An annular cavity is also arranged in the inner step hole. The symmetry center line of the rotary valve core coincides with the axis center line of the soft sealing structure.

[0008] The contact end between the rotary valve core and the soft sealing structure is a protruding drum-shaped sphere; the oil suction one-way valve is provided with an oil suction hole, the oil suction hole is connected with the annular cavity through the low-pressure oil hole and the oil drain hole provided on the rotary valve core, and the annular cavity is connected with an oil path inside the manual hydraulic pump; the oil pressure one-way valve is provided with an oil pressure valve seat hole, the oil pressure valve seat hole is connected with the oil pressure hole provided on the rotary valve core;

[0009] The soft sealing structure is a floating valve seat, the contact end of the floating valve seat and the rotating valve core is a concave spherical surface, the floating valve seat is provided with an oil hole along the axis direction, the oil hole is connected with another oil circuit inside the manual hydraulic pump through the floating oil cavity, and the outer ring of the floating valve seat is provided with a sealing ring;

[0010] One oil circuit inside the manual hydraulic pump includes a vertical hole and a first horizontal hole opened on the pump body and connected to each other; another oil circuit inside the manual hydraulic pump includes a second horizontal hole and a side hole opened on the pump body and connected to each other;

[0011] The outer end surface of the drum-shaped sphere of the rotary valve core is supported and positioned by the inner end surface of the support sleeve flange, and one end of the rotary valve core extending out of the support sleeve flange is connected to a handle;

[0012] The floating valve seat is made of plastic, one end of the floating valve seat not in contact with the drum-shaped ball abuts against one end of the spring, and the other end of the spring abuts against a sealing cover for sealing the floating oil chamber;

[0013] The hydraulic cylinder includes an upper cover, a cylinder, a hydraulic cylinder barrel, a piston, a piston rod and a base. One end of the hydraulic cylinder barrel is installed in the inner ring groove of the base, and the outer ring of the other end of the hydraulic cylinder barrel is connected to the upper cover. A cylinder is arranged between adjacent upper covers and the base. The piston is matched with the inner circumference of the hydraulic cylinder barrel, one end of the piston rod is matched with the piston, and the other end of the piston rod passes through the base.

[0014] The beneficial effects of the present invention are as follows:

[0015] The invention has a simple structure and is easy to use. It has the advantages of compact structure and good pressure-maintaining performance. The hydraulic cylinder, manual hydraulic pump and oil tank are arranged as an integrated structure, and the oil tank is connected with the oil chamber on the cylinder barrel of the hydraulic cylinder, which greatly reduces the design volume of the oil tank. The oil pressure check valve and the oil suction check valve of the manual hydraulic pump are arranged in the opening of the rotary valve core, and by arranging a soft sealing structure, the handle of the rotary valve core can be rotated to enable the manual hydraulic pump to achieve the oil pressure, pressure maintenance and pressure relief positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0017] Figure 2 It is a schematic cross-sectional structural diagram of the manual hydraulic pump in the present invention.

[0018] Figure 3 for Figure 2 Partial cross-sectional view of the manual hydraulic pump handle after it is rotated 45° counterclockwise.

[0019] Figure 4 for Figure 3 Partial cross-sectional view of the manual hydraulic pump handle after it is rotated 45° counterclockwise.

[0020] Among them: 1. Upper cover; 2. Through hole; 3. Cylinder; 4. Hydraulic cylinder; 501. Upper oil chamber of cylinder; 502. Lower oil chamber of cylinder; 6. Oil tank; 7. Piston; 8. Piston rod; 9. Base; 10. Pump body; 11. Screw; 12. Vertical hole; 13. Low-pressure oil hole; 14. Oil drain hole; 15. Short hole; 16. First horizontal hole; 17. High-pressure oil hole; 18. Second horizontal hole; 19. Side hole; 20, floating oil chamber; 21, oil pressure check valve; 22, oil pressure valve seat hole; 23, connecting hole; 24, oil suction check valve; 25, oil suction hole; 26, drum-shaped ball; 27, annular chamber; 28, manual pump plunger; 29, handle; 30, support sleeve flange; 31, rotary valve core; 32, oil pressure hole; 33, oil through hole; 34, sealing ring; 35, floating valve seat; 36, spring. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are described below.

[0022] like Figure 1 , Figure 2 As shown, the pressure-maintaining single-acting hydraulic manual mechanism includes an integrally formed hydraulic cylinder, an oil tank 6 and a manual hydraulic pump. The upper portion of the oil tank 6 is connected to the inner portion of the oil chamber 501 on the cylinder barrel of the hydraulic cylinder through the through hole 2 of the hydraulic cylinder. The lower portion of the oil tank 6 is connected to the inner hole of the manual hydraulic pump through an oil passage. The inner hole of the manual hydraulic pump is connected to the plunger oil chamber provided with a manual pump plunger 28 through a connecting hole 23. A rotating valve core 31 and a soft sealing structure abutting against each other are arranged inside the manual hydraulic pump. The interior of the pump is also connected to the lower oil chamber 502 of the cylinder barrel through another oil circuit; an oil pressure check valve 21 and an oil suction check valve 24 are respectively arranged in the opening at the inner end of the rotary valve core 31, and the pressure maintaining and oil draining positions of the hydraulic manual mechanism are realized by changing the position of the rotary valve core 31 relative to the soft sealing structure and opening and closing the oil pressure check valve 21 or the oil suction check valve 24; the oil pressure position of the hydraulic manual mechanism is realized by driving the manual pump plunger 28 of the manual hydraulic pump to open the oil pressure check valve 21.

[0023] like Figure 2 As shown, the inner hole of the manual hydraulic pump includes an inner step hole for installing the rotary valve core 31 and a floating oil chamber 20 for floating the soft sealing structure. An annular chamber 27 is also provided in the inner step hole. The symmetry center line of the rotary valve core 31 coincides with the axial center line of the soft sealing structure.

[0024] like Figure 1 , Figure 2As shown, the contact end of the rotary valve core 31 and the soft sealing structure is a drum-shaped sphere 26 protruding outward; the oil suction check valve 24 is provided with an oil suction hole 25, which is connected to the annular cavity 27 through the low-pressure oil hole 13 and the oil drain hole 14 provided on the rotary valve core 31, and the annular cavity 27 is connected to an oil path inside the manual hydraulic pump; the oil pressure check valve 21 is provided with an oil pressure valve seat hole 22, which is connected to the oil pressure hole 32 provided on the rotary valve core 31. The outer end surface of the drum-shaped sphere 26 of the rotary valve core 31 is supported and positioned by the inner end surface of the support sleeve flange 30, and one end of the rotary valve core 31 extending out of the support sleeve flange 30 is connected to the handle 29.

[0025] like Figure 2 As shown, the soft sealing structure is a floating valve seat 35, and a sealing ring 34 is arranged on the outer ring of the floating valve seat 35. The contact end of the floating valve seat 35 and the rotary valve core 31 is a concave spherical surface. The floating valve seat 35 is provided with an oil hole 33 along the axis direction, and the oil hole 33 is connected with another oil path inside the manual hydraulic pump through the floating oil chamber 20. The floating valve seat 35 is made of plastic structure, and the end of the floating valve seat 35 that does not contact the drum-shaped ball 26 abuts against one end of the spring 36, and the other end of the spring 36 abuts against the sealing cover used to seal the floating oil chamber 20.

[0026] like Figure 1 As shown, one oil circuit inside the manual hydraulic pump includes a vertical hole 12 and a first transverse hole 16 opened on the pump body 10 and connected to each other; another oil circuit inside the manual hydraulic pump includes a second transverse hole 18 and a side hole 19 opened on the pump body 10 and connected to each other.

[0027] like Figure 1 As shown, the hydraulic cylinder includes an upper cover 1, a cylinder 3, a hydraulic cylinder barrel 4, a piston 7, a piston rod 8 and a base 9. One end of the hydraulic cylinder barrel 4 is installed in the inner ring groove of the base 9, and the outer ring of the other end of the hydraulic cylinder barrel 4 is connected to the upper cover 1. The cylinder 3 is arranged between the adjacent upper covers 1 and the base 9. The piston 7 is matched with the inner circumference of the hydraulic cylinder barrel 4. One end of the piston rod 8 is matched with the piston 7, and the other end of the piston rod 8 passes through the base 9 (connected with the piston rod of the self-reset actuator of the valve). The pump body 10 of the manual hydraulic pump is fixed to the side of the base 9 by screws 11.

[0028] The specific working process of the present invention is as follows:

[0029] Oil pressure status:

[0030] The present invention is installed on the upper part of the pneumatic self-reset actuator of the valve. When the pneumatic actuator of the valve fails to drive the valve, the valve is driven manually. Figure 2 As shown, when the manual pump plunger 28 of the manual hydraulic pump is manually lifted, the oil suction check valve 24 is opened, as shown in FIG. Figure 1As shown, the oil in the oil tank 6 passes through the vertical hole 12, the first transverse hole 16, the short hole 15, and enters the annular cavity 27, and then enters the oil suction hole 25 through the oil drain hole 14 and the low-pressure oil through hole 13, and then flows into the plunger oil cavity through the connecting hole 23. When the manual pump plunger 28 of the manual hydraulic pump is pressed down, the oil pressure check valve 21 opens, and the oil enters the oil pressure hole 32 from the oil pressure valve seat hole 22, and then enters the floating oil cavity 20 through the oil through hole 33, and finally enters the lower oil cavity 502 of the cylinder in the lower half of the piston 7 through the high-pressure oil hole 17, the second transverse hole 18 and the side hole 19, pushing the piston 7 and the piston rod 8 to move upward, overcoming the return spring force of the valve pneumatic actuator, and driving the valve to open or close. Since the volume of the oil tank 6 is small, during the rising process of the piston 7, the oil in the oil tank 6 supplies the insufficient oil in the lower oil chamber 502 of the cylinder barrel below the piston 7, and the oil in the upper oil chamber 501 of the cylinder barrel above the piston 7 overflows during the rising process of the piston 7, flows into the oil tank 6 through the through hole 2 of the upper cover 1 to continue supplying oil.

[0031] Holding pressure state:

[0032] like Figure 3 As shown, when the valve reaches the desired position of opening or closing, the handle 29 is moved from Figure 1 , Figure 2 Rotate the position shown 45° counterclockwise to Figure 3 In the position shown, under the action of the high-pressure oil in the floating oil chamber 20 and the spring 36, the concave spherical surface of the plastic structure of the floating valve seat 35 is in close contact with the non-porous part of the drum-shaped ball 26 of the rotary valve core 31 and is in a soft sealing state with zero leakage, thereby cutting off the oil hole 33, the high-pressure oil hole 17, the second transverse hole 18 and the side hole 19, and the manual hydraulic mechanism is in a reliable pressure-maintaining state, so that the valve maintains the desired position.

[0033] Pressure relief status:

[0034] When the valve and its actuator return to normal, turn the handle 29 from Figure 3 The position shown is rotated 45° counterclockwise again (i.e. 90° relative to the initial position) to Figure 4 In the position shown, the oil drain hole 14 of the drum-shaped ball 26 is connected with the oil through hole 33 of the floating valve seat 35, and the oil in the lower oil chamber 502 of the cylinder at the bottom of the piston 7 flows back to the oil tank 6 through the side hole 19, the second transverse hole 18, the high-pressure oil hole 17, the floating oil chamber 20, the oil through hole 33, the oil drain hole 14, the annular cavity 27, the short hole 15, the first transverse hole 16, and the vertical hole 12. Since the volume of the oil tank 6 is small, during the descending process of the piston 7, the part of the oil flowing out of the lower oil chamber 502 of the cylinder that exceeds the capacity of the oil tank 6 overflows into the upper oil chamber 501 of the cylinder through the oil hole 2 of the upper cover 1 for storage.

[0035] The invention has a simple structure and is easy to use. It has the advantages of compact structure and good pressure-maintaining performance. The hydraulic cylinder, manual hydraulic pump and oil tank are arranged as an integrated structure, and the oil tank is connected with the oil chamber on the cylinder barrel of the hydraulic cylinder, which greatly reduces the design volume of the oil tank. The oil pressure check valve and the oil suction check valve of the manual hydraulic pump are arranged in the opening of the rotary valve core, and by arranging a soft sealing structure, the handle of the rotary valve core can be rotated to enable the manual hydraulic pump to achieve the oil pressure, pressure maintenance and pressure relief positions.

[0036] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. The present invention may be modified in any form without violating the basic structure of the present invention.

Claims

1. Pressure-maintaining single-acting hydraulic manual mechanism, characterized by: The invention comprises an integrally formed hydraulic cylinder, an oil tank (6) and a manual hydraulic pump, wherein one end of the oil tank (6) is connected to the interior of an oil chamber (501) on a cylinder barrel of the hydraulic cylinder through a through hole (2) of the hydraulic cylinder, the other end of the oil tank (6) is connected to the inner hole of the manual hydraulic pump through an oil path, the inner hole of the manual hydraulic pump is connected to a plunger oil chamber provided with a manual pump plunger (28) through a connecting hole (23), a rotating valve core (31) and a soft sealing structure abutting against each other are arranged inside the manual hydraulic pump, and the interior of the manual hydraulic pump is also The rotary valve core (31) is connected to the lower oil chamber (502) of the cylinder barrel through another oil passage; an oil pressure check valve (21) and an oil suction check valve (24) are respectively arranged in the inner end opening of the rotary valve core (31); the pressure holding and oil draining positions of the hydraulic manual mechanism are realized by changing the position of the rotary valve core (31) relative to the soft sealing structure and opening and closing the oil pressure check valve (21) or the oil suction check valve (24); and the oil pressure position of the hydraulic manual mechanism is realized by driving the manual pump plunger (28) of the manual hydraulic pump to open the oil pressure check valve (21). The inner hole of the manual hydraulic pump comprises an inner step hole for mounting a rotary valve core (31) and a floating oil chamber (20) for floating the soft sealing structure. An annular chamber (27) is also provided in the inner step hole. The symmetry center line of the rotary valve core (31) coincides with the axis center line of the soft sealing structure. The contact end of the rotary valve core (31) and the soft sealing structure is a protruding drum-shaped sphere (26); the oil suction check valve (24) is provided with an oil suction hole (25), the oil suction hole (25) is communicated with an annular cavity (27) through a low-pressure oil through hole (13) and an oil drain hole (14) provided on the rotary valve core (31), and the annular cavity (27) is communicated with an oil path inside a manual hydraulic pump; the oil pressure check valve (21) is provided with an oil pressure valve seat hole (22), the oil pressure valve seat hole (22) is communicated with an oil pressure hole (32) provided on the rotary valve core (31), The soft sealing structure is a floating valve seat (35). The contact end of the floating valve seat (35) and the rotary valve core (31) is a concave spherical surface. The floating valve seat (35) is provided with an oil hole (33) along the axis direction. The oil hole (33) is connected to another oil path inside the manual hydraulic pump through the floating oil chamber (20). The outer ring of the floating valve seat (35) is provided with a sealing ring (34). The working process is as follows: Oil pressure status: The oil enters the annular cavity (27), then enters the oil suction hole (25), and flows into the plunger oil cavity; when the manual pump plunger (28) of the manual hydraulic pump is pressed downward, the oil pressure check valve (21) opens, and the oil enters the lower oil cavity (502) of the cylinder, driving the valve to open or close; the oil in the oil tank (6) supplies the insufficient oil volume of the lower oil cavity (502) of the cylinder, and the oil in the upper oil cavity (501) of the cylinder overflows during the rising process of the piston and flows into the oil tank (6) to continue supplying oil. Holding pressure state: When the valve reaches the desired open or closed position, the handle is turned, and the concave spherical surface of the floating valve seat (35) and the non-porous part of the drum-shaped sphere (26) of the rotary valve core (31) are in close contact with each other in a zero-leakage soft sealing state. The manual hydraulic mechanism is in a reliable pressure-maintaining state, so that the valve maintains the desired position. Pressure relief status: When the valve and its actuator return to normal, the handle is turned, and the oil in the lower oil chamber (502) of the cylinder barrel flows back to the oil tank (6). During the descending process of the piston, the oil flowing out of the lower oil chamber (502) of the cylinder barrel exceeds the capacity of the oil tank (6) and overflows into the upper oil chamber (501) of the cylinder barrel for storage.

2. The pressure-maintaining single-acting hydraulic manual mechanism according to claim 1, characterized in that: An oil circuit inside the manual hydraulic pump comprises a vertical hole (12) and a first transverse hole (16) which are opened on the pump body (10) and are in communication with each other; another oil circuit inside the manual hydraulic pump comprises a second transverse hole (18) and a side hole (19) which are opened on the pump body (10) and are in communication with each other.

3. The pressure-maintaining single-acting hydraulic manual mechanism according to claim 1, characterized in that: A support sleeve flange (30) is provided at the drum-shaped sphere (26) of the rotary valve core (31); the outer end surface of the drum-shaped sphere (26) of the rotary valve core (31) is supported and positioned by the inner end surface of the support sleeve flange (30); and one end of the rotary valve core (31) extending out of the support sleeve flange (30) is connected to a handle (29).

4. The pressure-maintaining single-acting hydraulic manual mechanism according to claim 1, characterized in that: The floating valve seat (35) is made of a plastic structure. One end of the floating valve seat (35) that does not contact the drum-shaped ball (26) abuts against one end of a spring (36), and the other end of the spring (36) abuts against a sealing cover for sealing the floating oil chamber (20).

5. The pressure-maintaining single-acting hydraulic manual mechanism according to claim 1, characterized in that: The hydraulic cylinder comprises an upper cover (1), a cylinder (3), a hydraulic cylinder barrel (4), a piston (7), a piston rod (8) and a base (9); one end of the hydraulic cylinder barrel (4) is mounted in an inner ring groove of the base (9); the outer ring of the other end of the hydraulic cylinder barrel (4) is connected to the upper cover (1); a cylinder (3) is arranged between adjacent upper covers (1) and bases (9); the piston (7) is fitted to the inner circumference of the hydraulic cylinder barrel (4); one end of the piston rod (8) is fitted to the piston (7); and the other end of the piston rod (8) passes through the base (9).

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