CN216009727U - Heavy-duty medium-pressure main steam valve actuating mechanism - Google Patents
Heavy-duty medium-pressure main steam valve actuating mechanism Download PDFInfo
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- CN216009727U CN216009727U CN202122587446.7U CN202122587446U CN216009727U CN 216009727 U CN216009727 U CN 216009727U CN 202122587446 U CN202122587446 U CN 202122587446U CN 216009727 U CN216009727 U CN 216009727U
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Abstract
The utility model relates to the field of valve actuating mechanisms used by turbo generator units, in particular to a heavy-duty medium-pressure main steam valve actuating mechanism, which comprises a main steam valve actuating module and an oil circuit control module, wherein the main steam valve actuating module is connected with the oil circuit control module in order to solve the problems that the valve rod of the valve actuating mechanism used by the existing turbo generator unit is stressed greatly and has potential safety hazards; the main steam valve execution module comprises an oil cylinder, a damping spring, a spring and a piston rod; the oil cylinder is internally provided with a piston rod, the piston of the piston rod divides the oil cylinder into a working cavity and a non-working cavity, the piston rod is positioned in the non-working cavity, a stroke separating plate is arranged in the non-working cavity, the stroke separating plate divides the non-working cavity into an oil engine part and an operating seat part, the oil engine part is provided with a damping spring, the operating seat part is provided with a spring, the damping spring is additionally arranged in the oil cylinder, and the damping spring is compressed to release the spring force when the valve is fully opened, so that part of oil engine force is counteracted, the stress of the valve rod is relieved, and the safety of the assembly is improved.
Description
Technical Field
The utility model relates to a valve actuating mechanism field that turbo generator set used, concretely relates to heavy-duty type middling pressure main steam valve actuating mechanism
Background
At present, valve actuating mechanisms used by a steam turbine generator unit are mostly hydraulic actuating mechanisms with oil fed from one side and comprise a spring operating seat and an oil engine. The structure is characterized in that the opening is close to oil pressure and the closing is close to spring force. In recent years, the performance of the steam turbine generator set is developed to a certain extent by digesting and absorbing advanced technologies at home and abroad and combining the actual situation of the steam turbine generator set at home, but the valve rod is stressed greatly when the load of the steam turbine generator set is large, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a purpose is great in order to solve the valve rod atress of the valve actuating mechanism that current turbo generator set used, has the problem of potential safety hazard, the utility model provides a heavy load type middling pressure main steam valve actuating mechanism.
In order to achieve the above object, the utility model discloses a heavy-duty medium-pressure main steam valve actuating mechanism, which comprises a main steam valve actuating module and an oil circuit control module, wherein the main steam valve actuating module is connected with the oil circuit control module;
the main steam valve execution module comprises an oil cylinder, a damping spring, a spring and a piston rod;
the hydraulic cylinder is internally provided with a piston rod, the piston of the piston rod divides the hydraulic cylinder into a working cavity and a non-working cavity, the piston rod is positioned in the non-working cavity, a stroke-dividing partition plate is arranged in the non-working cavity, the stroke-dividing partition plate divides the non-working cavity into a hydraulic servomotor part and an operating seat part, the hydraulic servomotor part is provided with a damping spring, and the operating seat part is provided with a spring.
Further, the spring and the damping spring are sleeved outside the piston rod.
Still further, an oil-operated machine part is arranged between the stroke separating plate and the piston, the damping spring is arranged between the stroke separating plate and the piston, a spring base plate is arranged on the piston rod and is located inside the operating seat part, and the spring is arranged between the spring base plate and the inner end face of the operating seat.
Further, the upper part of the piston rod is provided with a linear displacement sensor.
Still further, the upper portion of piston rod is equipped with travel switch.
Furthermore, the oil way control module comprises an unloading valve, a switch electromagnetic valve, a movable electromagnetic valve, a pressure oil return pipeline, a high-pressure oil pipeline and a critical interruption control oil pipeline;
the pressure oil return pipeline is connected with the oil cylinder, the joint of the pressure oil return pipeline and the oil cylinder is positioned in the non-working cavity, and the unloading valve is arranged on the pressure oil return pipeline;
the high-pressure oil pipeline is connected with the oil cylinder; the joint of the high-pressure oil pipeline and the oil cylinder is positioned in the working cavity, and the unloading valve is also connected with the emergency trip control oil pipeline;
the pressure oil return pipeline is connected with the emergency interruption control oil pipeline through a switch electromagnetic valve, and the pressure oil return pipeline is connected with the high-pressure oil pipeline through a movable electromagnetic valve.
And furthermore, an energy accumulator is arranged on the pressure oil return pipeline and is arranged between the oil cylinder and the unloading valve. Furthermore, an energy accumulator is arranged on the pressure oil return pipeline and is arranged between the oil cylinder and the unloading valve.
Still further, the oil circuit control module still includes the detection oil circuit, detection oil circuit one end is connected with the hydro-cylinder, and the other end of detection oil circuit is connected with high-pressure oil pipe way, is equipped with the detection orifice on the detection oil circuit.
Has the advantages that:
the heavy-duty medium-pressure main steam valve actuating mechanism enlarges the diameter of the oil cylinder, the damping spring is added in the oil cylinder, and the full-open position of the valve ensures that the force of the actuating mechanism on the valve is not greater than the value of the original structure. Compared with the existing actuating mechanism, the heavy-duty actuating mechanism is additionally provided with the damping spring in the oil cylinder, the damping spring is compressed to release the spring force when the valve is fully opened, partial oil motor force is counteracted, the stress of the valve rod is reduced, and the safety of the assembly is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional actuator;
fig. 2 is a schematic view of the overall structure of a heavy-duty medium-pressure main steam valve actuator according to the present invention;
fig. 3 is a schematic view of a partial structure of a heavy-duty medium-pressure main steam valve actuator according to the present invention;
fig. 4 is the system structure diagram of a heavy-duty medium-pressure main steam valve actuating mechanism of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be given by way of example only with reference to the accompanying drawings, and the embodiments are not limited thereto.
The first embodiment is as follows: a heavy-duty medium-pressure main steam valve actuating mechanism comprises a main steam valve actuating module and an oil way control module, wherein the main steam valve actuating module is connected with the oil way control module;
the main steam valve execution module comprises an oil cylinder 1, a damping spring 2, a spring 3 and a piston rod 4;
the hydraulic control system is characterized in that a piston rod 4 is arranged in the oil cylinder 1, a piston 4-1 of the piston rod 4 divides the oil cylinder 1 into a working cavity and a non-working cavity, the piston rod 4 is located in the non-working cavity, a stroke division plate 1-1 is arranged in the non-working cavity, the stroke division plate 1-1 divides the non-working cavity into an oil engine part and an operation seat part, the oil engine part is provided with a damping spring 2, and the operation seat part is provided with a spring 3.
The second embodiment is as follows: a heavy-duty medium-pressure main steam valve actuating mechanism is characterized in that a spring 3 and a damping spring 2 are sleeved outside a piston rod 4.
The other embodiments are the same as the first embodiment.
The third concrete implementation mode: a hydraulic servomotor part is arranged between a stroke separating plate 1-1 and a piston 4-1, a damping spring 2 is arranged between the stroke separating plate 1-1 and the piston 4-1, a spring base plate 4-2 is arranged on a piston rod 4, the spring base plate 4-2 is located inside an operation seat part, and a spring 3 is arranged between the spring base plate 4-2 and an inner end face of an operation seat.
The other embodiments are the same as the first embodiment.
The fourth concrete implementation mode: a heavy-duty medium-pressure main steam valve actuating mechanism is characterized in that a linear displacement sensor 5 is arranged at the upper part of a piston rod 4.
The other embodiments are the same as the first embodiment.
The fifth concrete implementation mode: the heavy-duty medium-pressure main steam valve actuating mechanism is characterized in that a travel switch 6 is arranged at the upper part of a piston rod 4.
The other embodiments are the same as the first embodiment.
The sixth specific implementation mode: a heavy-duty medium-pressure main steam valve actuating mechanism is characterized in that an oil way control module comprises an unloading valve 7, a switch electromagnetic valve 8, a movable electromagnetic valve 9, a pressure oil return pipeline 10, a high-pressure oil pipeline 11 and a critical interruption control oil pipeline 12;
the pressure oil return pipeline 10 is connected with the oil cylinder 1, the joint of the pressure oil return pipeline 10 and the oil cylinder 1 is positioned in a non-working cavity, and the unloading valve 7 is arranged on the pressure oil return pipeline 10;
the high-pressure oil pipeline 11 is connected with the oil cylinder 1; the joint of the high-pressure oil pipeline 11 and the oil cylinder 1 is positioned in a working cavity, and the unloading valve 7 is also connected with a critical interruption control oil pipeline 12;
the pressure oil return pipeline 10 is connected with the emergency interruption control oil pipeline 12 through a switch electromagnetic valve 8, and the pressure oil return pipeline 10 is connected with the high-pressure oil pipeline 11 through a movable electromagnetic valve 9.
The other embodiments are the same as the first embodiment.
The seventh embodiment: the heavy-duty medium-pressure main steam valve actuating mechanism is characterized in that an energy accumulator 14 is arranged on a pressure oil return pipeline 10, and the energy accumulator 14 is arranged between an oil cylinder 1 and an unloading valve 7.
The other embodiments are the same as the sixth embodiment.
The specific implementation mode is eight: the oil way control module further comprises a detection oil way 13, one end of the detection oil way 13 is connected with the oil cylinder 1, the other end of the detection oil way 13 is connected with the high-pressure oil pipeline 11, and a detection throttling hole is formed in the detection oil way 13.
The other embodiments are the same as the first embodiment.
This embodiment is described with reference to fig. 1 to 4:
the embodiment describes a heavy-duty medium-pressure main steam valve actuating mechanism, which mainly comprises: the hydraulic control valve comprises an oil cylinder 1, a damping spring 2, a spring 3, a valve rod 4, an LVDT5 (linear displacement transducer), a travel switch 6, an unloading valve 7, a switch electromagnetic valve 8 and a movable electromagnetic valve 9.
The high-pressure main steam valve oil engine finishes a control signal from a DEH control system, the switch electromagnetic valve 8 is turned off after the control signal is obtained, the valve core of the unloading valve 7 is turned off under the action of AST oil pressure of an upper cavity of the switch electromagnetic valve and a spring, at the moment, high-pressure oil enters the lower parts of the execution mechanism oil cylinder and the unloading valve through a throttling hole, and under the action of the oil pressure, the execution mechanism overcomes the acting force, the friction force, the gravity of the valve, the damping spring force 2 of the oil cylinder and the spring force 3 of the operating seat of steam on the valve to open the high-pressure main steam valve. The displacement sensor 6 and LVDT7 are used to monitor the change in position of the valve stem 4.
When the movable electromagnetic valve 9 of the oil-driven machine is closed in a power-off mode during normal operation, when a main throttle needs to perform an activity test according to the regulation of the operation rule of the thermal power steam turbine generator unit, an operator sends a main throttle activity test instruction in a centralized control room, the main throttle activity test electromagnetic valve 9 is powered on and opened, the load pressure oil part of the lower cavity of the piston of the oil cylinder 1 of the oil-driven machine is discharged, the load oil pressure part of the lower cavity of the piston of the oil cylinder 1 of the oil-driven machine falls, and the main throttle is closed for a certain stroke under the action of the spring force 3 of the operating base.
When the system emergency interruption or the switch electromagnetic valve 8 is opened, the automatic stop emergency interruption oil (AST oil) on the control cavity of the unloading valve 7 loses pressure, the unloading valve 7 is quickly opened under the action of pressure oil, the pressure oil in the lower cavity of the piston rod of the servomotor is quickly unloaded, and the main valve is quickly closed under the action of the spring force 3.
Compared with the existing actuating mechanism, the actuating mechanism has the advantages that the damping spring is additionally arranged in the non-working cavity of the oil cylinder, when the valve does not reach the full-open state, the actuating mechanism can overcome the corresponding spring force 3 and steam force of the operating seat without large oil pressure, the stress of the valve rod is not large, and the damping spring in the oil cylinder is not compressed.
When the valve reaches the full-open position, the high-pressure oil pressure is larger, the high-pressure oil acts on the piston to overcome the spring force and the steam force to open the valve, the stress of the valve rod is the difference value of the oil motor force, the spring force and the steam force, the force is larger, the damping spring in the oil cylinder compresses to release the spring force to be partially offset with the oil motor force, the stress of the valve rod can be reduced, and the safety of a unit is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a heavy-duty type middling pressure main steam valve actuating mechanism which characterized in that: the main steam valve execution module is connected with the oil way control module;
the main steam valve execution module comprises an oil cylinder (1), a damping spring (2), a spring (3) and a piston rod (4);
the hydraulic cylinder is characterized in that a piston rod (4) is arranged in the oil cylinder (1), a piston (4-1) of the piston rod (4) divides the oil cylinder (1) into a working cavity and a non-working cavity, the piston rod (4) is located in the non-working cavity, a range partition plate (1-1) is arranged in the non-working cavity, the range partition plate (1-1) divides the non-working cavity into an oil engine part and an operation seat part, the oil engine part is provided with a damping spring (2), and the operation seat part is provided with a spring (3).
2. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the spring (3) and the damping spring (2) are sleeved outside the piston rod (4).
3. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the hydraulic control device is characterized in that a servomotor part is arranged between the range division plate (1-1) and the piston (4-1), the damping spring (2) is arranged between the range division plate (1-1) and the piston (4-1), a spring base plate (4-2) is arranged on the piston rod (4), the spring base plate (4-2) is located inside the operating seat part, and the spring (3) is arranged between the spring base plate (4-2) and the inner end face of the operating seat.
4. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the upper part of the piston rod (4) is provided with a linear displacement sensor (5).
5. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the upper part of the piston rod (4) is provided with a travel switch (6).
6. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the oil way control module comprises an unloading valve (7), a switch electromagnetic valve (8), a movable electromagnetic valve (9), a pressure oil return pipeline (10), a high-pressure oil pipeline (11) and a critical interruption control oil pipeline (12);
the pressure oil return pipeline (10) is connected with the oil cylinder (1), the joint of the pressure oil return pipeline (10) and the oil cylinder (1) is positioned in a non-working cavity, and the unloading valve (7) is arranged on the pressure oil return pipeline (10);
the high-pressure oil pipeline (11) is connected with the oil cylinder (1); the joint of the high-pressure oil pipeline (11) and the oil cylinder (1) is positioned in a working cavity, and the unloading valve (7) is also connected with a critical interruption control oil pipeline (12);
the pressure oil return pipeline (10) is connected with the emergency interruption control oil pipeline (12) through a switch electromagnetic valve (8), and the pressure oil return pipeline (10) is connected with the high-pressure oil pipeline (11) through a movable electromagnetic valve (9).
7. The heavy-duty medium pressure main steam valve actuator of claim 6, wherein: an energy accumulator (14) is arranged on the pressure oil return pipeline (10), and the energy accumulator (14) is arranged between the oil cylinder (1) and the unloading valve (7).
8. The heavy duty medium pressure main steam valve actuator of claim 1, wherein: the oil circuit control module further comprises a detection oil circuit (13), one end of the detection oil circuit (13) is connected with the oil cylinder (1), the other end of the detection oil circuit (13) is connected with the high-pressure oil pipeline (11), and a detection throttling hole is formed in the detection oil circuit (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122587446.7U CN216009727U (en) | 2021-10-26 | 2021-10-26 | Heavy-duty medium-pressure main steam valve actuating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122587446.7U CN216009727U (en) | 2021-10-26 | 2021-10-26 | Heavy-duty medium-pressure main steam valve actuating mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN216009727U true CN216009727U (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122587446.7U Active CN216009727U (en) | 2021-10-26 | 2021-10-26 | Heavy-duty medium-pressure main steam valve actuating mechanism |
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| CN (1) | CN216009727U (en) |
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- 2021-10-26 CN CN202122587446.7U patent/CN216009727U/en active Active
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