CN213953693U - Lifting force self-balancing hydraulic actuator - Google Patents
Lifting force self-balancing hydraulic actuator Download PDFInfo
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- CN213953693U CN213953693U CN202023143421.XU CN202023143421U CN213953693U CN 213953693 U CN213953693 U CN 213953693U CN 202023143421 U CN202023143421 U CN 202023143421U CN 213953693 U CN213953693 U CN 213953693U
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Abstract
A lifting force self-balancing hydraulic actuator relates to a valve limiting technology and aims to solve the problem that a steam valve of a steam turbine has too large lifting force. This is novel through setting up balanced orifice subassembly on steam valve body's lateral wall to balanced orifice subassembly is located hydro-cylinder lower chamber hydraulic fluid port and hydro-cylinder and goes up between the hydraulic fluid port, realizes adjusting steam valve body's interior pressure through the aperture that changes balanced orifice subassembly. The steam turbine steam valve has the beneficial effects that the problem that the valve rod of the steam turbine steam valve with the valve limited is stressed too much is solved, and the safety of the valve rod is improved, so that the reliability of the valve is further improved, the safety of a unit is ensured, the operation efficiency is improved, and the fault risk is reduced. Suitable for adjusting the lifting force of the valve rod.
Description
Technical Field
The utility model relates to a steam turbine steam valve stroke is spacing technique.
Background
At present, the steam valve stroke of the steam turbine has two modes, namely, the limitation of an oil engine and the limitation of a valve; under the condition of valve spacing, the maximum stress borne by the valve rod is the pulling force generated when the actuating mechanism drives the valve, namely the lifting force. If the lifting force is too small, the valve cannot be opened by the actuating mechanism, and if the lifting force is too large, the valve rod is broken; therefore, in many cases, when two conditions cannot be met simultaneously, the valve rod cannot be damaged while the valve can be pulled open by the actuating mechanism only by an external unloading mode; at the moment, a disc spring group is required to be used for propping against the actuating mechanism at the upper limit position; because the valve rod and the valve cover have thermal expansion in the actual operation of the unit, the actual stress condition is difficult to control; there is still a risk of breaking the valve stem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem of too big lifting power of steam turbine steam valve, providing a lifting power self-balancing actuating mechanism that surges.
The lifting force self-balancing hydraulic actuator comprises a balance throttling hole assembly, an electro-hydraulic converter, an unloading valve, a displacement sensor and a two-position three-way electromagnetic valve;
the displacement sensor is used for monitoring the position change of the valve rod, the displacement signal output end of the displacement sensor is connected with the displacement signal input end of the electro-hydraulic converter, and the liquid level signal of the electro-hydraulic converter is used as a working position conversion trigger signal of the two-position three-way electromagnetic valve;
the liquid inlet of the two-position three-way electromagnetic valve is communicated with the high-pressure oil port through a high-pressure valve, the normally closed liquid outlet of the two-position three-way electromagnetic valve is communicated with the oil return port, the normally open liquid outlet of the two-position three-way electromagnetic valve is communicated with the oil port of the lower cavity of the oil cylinder, and the normally open liquid outlet of the two-position three-way electromagnetic valve is communicated with the liquid inlet of the unloading valve; a normally open liquid outlet of the unloading valve is communicated with an oil port on the upper cavity of the oil cylinder; a normally closed liquid outlet of the unloading valve is communicated with an oil return port; the trigger port of the unloading valve is communicated with the safety oil port;
the balance throttle hole assembly is arranged on the side wall of the steam valve body and is positioned between the oil port of the lower cavity of the oil cylinder and the oil port of the upper cavity of the oil cylinder, and the internal pressure of the steam valve body is adjusted by changing the aperture of the balance throttle hole assembly.
The utility model adds the balance throttling hole component, and realizes the adjustment of the internal pressure of the steam valve body by changing the aperture of the balance throttling hole component; according to the Bernoulli equation, the flow area ratio determines the internal pressure of the steam valve body, so that the internal pressure of the steam valve body of the actuating mechanism is reduced, and the lifting force is reduced; the structure realizes the conversion of large lifting force in a small stroke and small lifting force in a large stroke state.
The beneficial effects of the utility model are that solve the too big problem of steam turbine steam valve rod atress of the spacing type of valve, improved the security of valve rod to further improved the valve reliability, guaranteed the unit security, improved operating efficiency, reduced the trouble risk.
Drawings
Fig. 1 is a schematic view of a lifting force self-balancing hydraulic actuator according to a first embodiment of the present invention;
FIG. 2 is a pictorial view of a balanced orifice assembly installed with the valve stem in a fully closed position in accordance with a first embodiment;
FIG. 3 is a pictorial view of the balanced orifice assembly installed when the valve stem is in a fully open position in accordance with the first embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 3, and the lifting force self-balancing hydraulic actuator in the embodiment comprises a balance orifice assembly 3, an electro-hydraulic converter 5, an unloading valve 6, a displacement sensor 7 and a two-position three-way solenoid valve 8;
the displacement sensor 7 is used for monitoring the position change of the valve rod 2, the displacement signal output end of the displacement sensor 7 is connected with the displacement signal input end of the electro-hydraulic converter 5, and a liquid level signal of the electro-hydraulic converter 5 is used as a working position conversion trigger signal of the two-position three-way electromagnetic valve 8;
a liquid inlet of the two-position three-way electromagnetic valve 8 is communicated with a high-pressure oil port through a high-pressure valve, a normally closed liquid outlet of the two-position three-way electromagnetic valve 8 is communicated with an oil return port, a normally open liquid outlet of the two-position three-way electromagnetic valve 8 is communicated with an oil port of a lower cavity of the oil cylinder, and a normally open liquid outlet of the two-position three-way electromagnetic valve 8 is communicated with a liquid inlet of the unloading valve 6; a normally open liquid outlet of the unloading valve 6 is communicated with an oil port on the upper cavity of the oil cylinder; a normally closed liquid outlet of the unloading valve 6 is communicated with an oil return port; the trigger port of the unloading valve 6 is communicated with the safety oil port;
the balance throttling hole assembly 3 is arranged on the side wall of the steam valve body 1, the balance throttling hole assembly 3 is located between the lower cavity oil port of the oil cylinder and the upper cavity oil port of the oil cylinder, and the inner pressure of the steam valve body 1 is adjusted by changing the aperture of the balance throttling hole assembly 3.
In the present embodiment, when the valve rod 2 is in the fully closed state, the balance orifice assembly 3 is in the oil return chamber, and does not act on the valve rod 2, and the lifting force of the valve rod 2 is unchanged; when valve rod 2 was in full open mode, balanced orifice subassembly 3 was located the oil feed cavity, acted on valve rod 2, reduced valve rod 2's lifting force, had the effect of protection valve.
In the embodiment, compared with the existing actuator, only the balance orifice assembly 3 is added, the pore diameter of the different balance orifice assembly 3 can be replaced in the debugging process to adjust the internal pressure of the steam valve body of the actuator, the change of the internal pressure is measured through a pressure measuring joint on the steam valve body of the actuator to confirm whether the internal pressure is proper, and the pore diameter of the balance orifice assembly 3 can be adjusted again when necessary; a balance orifice assembly 3 for changing the hole diameter when the internal pressure is required to be reduced, and a balance orifice assembly 3 for changing the hole diameter when the internal pressure is required to be increased; the balance throttle hole assembly 3 is not influenced by the running state of the unit, can be monitored at any time, and can be quickly replaced as long as the unit is stopped.
The second embodiment is as follows: in the embodiment, an oil port of a lower cavity of an oil cylinder is positioned at the lower part of the side wall of the steam valve body 1, and an oil port of an upper cavity of the oil cylinder is positioned at the upper part of the side wall of the steam valve body 1; the balance orifice assembly 3 is located at the 95% open position of the stroke.
The third concrete implementation mode: in this embodiment, the lifting force self-balancing hydraulic actuator described in the first embodiment is further defined, and in this embodiment, the actuator further includes a cushion valve 4;
the buffer valve 4 is arranged at an oil port of the lower cavity of the oil cylinder.
The fourth concrete implementation mode: in this embodiment, a safety oil orifice 10 is provided in a pipe between the high-pressure valve and the liquid inlet of the two-position three-way solenoid valve 8, and the pipe is communicated with the safety oil port through the safety oil orifice 10.
The fifth concrete implementation mode: in the embodiment, a lifting force self-balancing hydraulic actuator in the first embodiment is further limited, in the embodiment, a screw hole 9 is formed in the side wall of the steam valve body 1; the balanced orifice assembly 3 is mounted in the plug hole 9.
In the present embodiment, the screw hole 9 is a fabrication hole for installing the balanced orifice assembly 3 and also facilitating replacement of the balanced orifice assembly 3; and the outermost end of the plug hole 9 is provided with a plug screw.
Claims (5)
1. A lifting force self-balancing hydraulic actuator is characterized by comprising a balance orifice assembly (3), an electro-hydraulic converter (5), an unloading valve (6), a displacement sensor (7) and a two-position three-way electromagnetic valve (8);
the displacement sensor (7) is used for monitoring the position change of the valve rod (2), the displacement signal output end of the displacement sensor (7) is connected with the displacement signal input end of the electro-hydraulic converter (5), and a liquid level signal of the electro-hydraulic converter (5) is used as a working position conversion trigger signal of the two-position three-way electromagnetic valve (8);
a liquid inlet of the two-position three-way electromagnetic valve (8) is communicated with a high-pressure oil port through a high-pressure valve, a normally closed liquid outlet of the two-position three-way electromagnetic valve (8) is communicated with an oil return port, a normally open liquid outlet of the two-position three-way electromagnetic valve (8) is communicated with an oil port of a lower cavity of the oil cylinder, and a normally open liquid outlet of the two-position three-way electromagnetic valve (8) is communicated with a liquid inlet of the unloading valve (6); a normally open liquid outlet of the unloading valve (6) is communicated with an oil port on the upper cavity of the oil cylinder; a normally closed liquid outlet of the unloading valve (6) is communicated with an oil return port; the trigger port of the unloading valve (6) is communicated with the safety oil port;
the balance throttle hole assembly (3) is arranged on the side wall of the steam valve body (1), the balance throttle hole assembly (3) is located between an oil port of a lower cavity of the oil cylinder and an oil port of an upper cavity of the oil cylinder, and the inner pressure of the steam valve body (1) is adjusted by changing the aperture of the balance throttle hole assembly (3).
2. The lifting force self-balancing hydraulic actuator according to claim 1, wherein the lower cavity oil port of the oil cylinder is located at the lower part of the side wall of the steam valve body (1), and the upper cavity oil port of the oil cylinder is located at the upper part of the side wall of the steam valve body (1); the balance throttle hole assembly (3) is located at a 95% opening position of a stroke.
3. A lift self-balancing hydraulic actuator according to claim 1 or 2, further comprising a cushion valve (4);
the buffer valve (4) is arranged at an oil port of a lower cavity of the oil cylinder.
4. The lifting force self-balancing hydraulic actuator as claimed in claim 1, wherein a safety oil orifice (10) is provided in a pipe between the high pressure valve and the inlet of the two-position three-way solenoid valve (8), and the safety oil orifice (10) is connected to a safety oil port.
5. The lifting force self-balancing hydraulic actuator according to claim 1, wherein a plug hole (9) is formed in a side wall of the steam valve body (1); the balance orifice assembly (3) is arranged in the screw plug hole (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023143421.XU CN213953693U (en) | 2020-12-23 | 2020-12-23 | Lifting force self-balancing hydraulic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023143421.XU CN213953693U (en) | 2020-12-23 | 2020-12-23 | Lifting force self-balancing hydraulic actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213953693U true CN213953693U (en) | 2021-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023143421.XU Active CN213953693U (en) | 2020-12-23 | 2020-12-23 | Lifting force self-balancing hydraulic actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213953693U (en) |
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2020
- 2020-12-23 CN CN202023143421.XU patent/CN213953693U/en active Active
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