CN211449813U - Self-powered steam control valve device - Google Patents
Self-powered steam control valve device Download PDFInfo
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- CN211449813U CN211449813U CN201922327380.0U CN201922327380U CN211449813U CN 211449813 U CN211449813 U CN 211449813U CN 201922327380 U CN201922327380 U CN 201922327380U CN 211449813 U CN211449813 U CN 211449813U
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Abstract
The utility model is suitable for a steam conduit valve control technical field provides a self-powered steam control valve device, include: the steam generator comprises a valve body, a driving module and a steam generating module; the valve body is fixedly installed in a steam pipeline and electrically connected with the driving module, a generator impeller of the steam power generation module is fixedly installed in the steam pipeline, the blade driving direction of the generator impeller is consistent with the steam flow direction in the steam pipeline, the generator impeller is connected with a generator of the steam power generation module through a driving shaft, and the generator is electrically connected with the driving module. The novel operation mode that no external power supply is needed, power generation and energy storage are carried out by utilizing steam flow dynamic pressure, electric power is provided for valve action, power supply circuits required by a control valve are reduced, power of steam pressure and flow is utilized, and energy utilization efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of steam conduit valve control, especially, relate to a self-powered steam control valve device.
Background
The steam pipeline is used for providing the circulation of steam, and its application is very extensive, and is mostly automatic control now, installs control valve at the control end of steam pipeline for the circulation of control inside steam. In the ordinary steam pipe network user control valve, the valve can realize: avoiding the functions of unmeasuring small flow, reducing pipe loss, ensuring pipe network pressure and the like. The valve is arranged at the front end of the steam use of a user at the tail end of the steam pipe network. The on-off control is required to be realized through an external power supply and a communication signal.
Because the valve needs to be connected with a control signal and electrically controlled, the existing valve is usually provided with a long power line and a long communication line. In consideration of the internet of things at present, wired communication lines are necessarily replaced by wireless communication, and power supply lines are difficult to replace, so that long power supply lines have to be specially pulled for the electric control valves. On one hand, the problem of electricity safety and cost is involved in the overlong line, on the other hand, flowing steam has certain kinetic energy, the flowing steam is not effectively utilized in the prior art, and especially, the pressure requirement of many steam users (such as public bathrooms and garment washing and dyeing enterprises) on the steam is not high, and the kinetic energy of the steam cannot be used, so that energy waste is caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a self-powered steam control valve device provides and does not need external power supply, utilizes steam flow dynamic pressure to generate electricity the energy storage and for the valve action provides the novel operational mode of electric power, has reduced the required power supply circuit of control flap, has utilized the power of steam pressure and flow, has improved energy utilization efficiency.
The utility model provides a first aspect of the embodiment provides a self-powered steam control valve device, include:
the valve body is used for controlling the steam flow of the steam pipeline;
the driving module is used for controlling the opening degree of the valve body;
the steam power generation module is used for converting the kinetic energy of the steam in the steam pipeline into electric energy and supplying power to the driving module;
the valve body is fixedly installed in a steam pipeline and electrically connected with the driving module, a generator impeller of the steam power generation module is fixedly installed in the steam pipeline, the blade driving direction of the generator impeller is consistent with the steam flow direction in the steam pipeline, the generator impeller is connected with a generator of the steam power generation module through a driving shaft, and the generator is electrically connected with the driving module.
In one embodiment, an electric storage unit is further arranged between the driving module and the steam power generation module, an electric storage input end of the electric storage unit is connected with the generator power transmission end of the steam power generation module, and a power supply output end of the electric storage unit is connected with the power supply end of the driving module.
In one embodiment, a voltage stabilizing unit is further arranged between the electric storage unit and the steam power generation module, an input end of the voltage stabilizing unit is connected with the power transmission end of the generator of the steam power generation module, and an output end of the voltage stabilizing unit is connected with the electric storage input end of the electric storage unit.
In one embodiment, the driving module comprises a valve driving motor and a driving circuit, a power supply end of the driving circuit is connected with the steam power generation module, a control end of the driving circuit is electrically connected with the valve driving motor, and a valve driving shaft of the valve driving motor is connected with the valve body.
In one embodiment, the driving circuit is further in communication connection with a control terminal for initiating control instructions.
In one embodiment, the direction of rotation of the generator impeller is: rotating along the radial central line of the steam pipeline as an axis;
one end of the driving shaft is fixedly connected with a wheel core of the generator impeller, and the other end of the driving shaft extends out of the steam pipeline and is fixedly connected with the generator.
In one embodiment, the direction of rotation of the generator impeller is: the steam generator rotates by taking the axial center line of the steam pipeline as a shaft, and the blades of the generator impeller and the steam flow direction in the steam pipeline form an included angle of theta degrees;
the driving shaft comprises a first driving shaft and a second driving shaft, wherein one end of the first driving shaft is fixedly connected with a wheel core of the generator impeller, the other end of the first driving shaft is connected with one end of the second driving shaft through a steering gear, and the other end of the second driving shaft extends out of the steam pipeline and is fixedly connected with the generator.
In one embodiment, the drive shaft is sealingly connected to a wall of the steam conduit.
The embodiment of the utility model provides a compare the beneficial effect who exists with prior art and lie in at least:
the embodiment of the utility model provides an installation generator impeller in steam conduit, steam flow in-process area moving blade rotates, can make the generator of impeller connection produce the electric energy, is applied to electric control valve's power supply again with these electric energies, just can bane the circuit of electric control valve external power supply to effectively realize steam kinetic energy's utilization, improved the utilization efficiency of the steam energy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a self-powered vapor control valve device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a self-powered steam control valve device according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a self-powered steam control valve device according to a third embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a voltage stabilizing unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a driving circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, 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 is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
The first embodiment is as follows:
referring to fig. 1, the present embodiment provides a self-powered vapor control valve assembly comprising: valve body 1, drive module 2 and steam power generation module 3, wherein:
the valve body 1 is used for controlling the steam flow of the steam pipeline 8;
the driving module 2 is used for controlling the opening degree of the valve body 1;
the steam power generation module 3 is used for converting steam kinetic energy in the steam pipeline 8 into electric energy and supplying power to the driving module 2;
the valve body 1 is fixedly installed in a steam pipeline 8 and electrically connected with the driving module 2, a generator impeller 31 of the steam power generation module 3 is fixedly installed in the steam pipeline 8, the blade driving direction of the generator impeller 31 is consistent with the steam flow direction in the steam pipeline 8, the generator impeller 31 is connected with a generator 32 of the steam power generation module 3 through a driving shaft 33, and the generator 32 is electrically connected with the driving module 2.
When steam in the steam pipeline flows, blades of the impeller of the generator are blown to rotate, then the rotor of the generator is driven to rotate through the driving shaft, the generator generates electricity, the generated electricity supplies power to the driving module, an electric control valve is not required to be additionally connected with a power supply, the self-powered effect of the steam pipeline is formed, and as long as the steam flows all the time, the generator continuously supplies power, and the electric quantity requirement of the valve is completely met.
Since the valve is usually driven by a valve driving motor, and the operation of the motor needs to be realized by a driving circuit, preferably, in this embodiment, the driving module 2 includes a valve driving motor 21 and a driving circuit 22, a power supply end of the driving circuit 22 is connected to the steam power generation module 3, a control end of the driving circuit 22 is electrically connected to the valve driving motor 21, and a valve driving shaft of the valve driving motor 21 is connected to the valve body 1.
The driving circuit initiates a working instruction, the valve driving motor can be started and controls the valve body to be opened and closed, the specific circuit design is shown in fig. 5, the motor is controlled through 485 communication, and the forward rotation and the reverse rotation of the motor can be realized, so that the purpose of opening and closing the valve is achieved. The steam power generation module can provide power supplies VCC and V485, a circuit chip E4-E6 shown in the figure is an electric control switch, when the 1 pin is at a high level, the chip is conducted, and the 4 pins are electrified and transmit signals, so that the driving circuit only needs to control the power supply to be disconnected, and the signal instruction control of the motor can be realized.
As in the preferred embodiment shown in fig. 1, the driver circuit 22 is also communicatively connected to a control terminal 6, the control terminal 6 being adapted to initiate a control command, i.e. the above-mentioned power supply cut-off. The driving circuit is remotely controlled through a control platform or a mobile terminal, and automatic control of the electric control valve is realized.
In this embodiment, the rotation direction of the generator impeller 31 is: rotating around the radial center line of the steam pipeline 8 as an axis;
one end of the driving shaft 33 is fixedly connected with the wheel core of the generator impeller 31, and the other end of the driving shaft 33 extends out of the steam pipeline 8 and is fixedly connected with the generator 32.
The drive shaft 33 is connected to the wall of the steam pipe 8 in a sealing manner.
The rotating axis of the generator impeller is vertical to the flowing direction of steam, the steam flow blows the blades from the side surface, the impeller rotates like a waterwheel, and the wheel core and the rotating shaft of the generator rotate coaxially, so that the generator is driven to generate electricity.
Example two:
referring to fig. 2, the present embodiment provides a self-powered vapor control valve assembly comprising: valve body 1, drive module 2, steam power generation module 3, electric power storage unit 4 and voltage stabilizing unit 5, wherein:
the valve body 1 is used for controlling the steam flow of the steam pipeline 8;
the driving module 2 is used for controlling the opening degree of the valve body 1;
the steam power generation module 3 is used for converting steam kinetic energy in the steam pipeline 8 into electric energy and supplying power to the driving module 2;
the electric power storage unit 4 and the voltage stabilizing unit 5 are used for receiving and storing the electric energy generated by the steam power generation module 3 and providing stable voltage for the driving module 2, the electric power storage unit 4 can be a common storage battery, and the voltage stabilizing unit 5 can be regarded as a charger of the storage battery;
the valve body 1 is fixedly arranged in a steam pipeline 8 and is electrically connected with the driving module 2, a generator impeller 31 of the steam power generation module 3 is fixedly arranged in the steam pipeline 8, the blade driving direction of the generator impeller 31 is consistent with the steam flow direction in the steam pipeline 8, and the generator impeller 31 is connected with a generator 32 of the steam power generation module 3 through a driving shaft 33;
the steam power generation module 3, the voltage stabilizing unit 5 and the electric storage unit 4 are connected in sequence, that is, the power transmission end of the generator of the steam power generation module 3 is connected with the input end of the voltage stabilizing unit 5, the output end of the voltage stabilizing unit 5 is connected with the electric storage input end of the electric storage unit 4, and the power supply output end of the electric storage unit 4 is connected with the power supply end of the driving module 2.
The circuit implementation of the voltage stabilizing unit 5 is shown in fig. 4, the left input voltage Uin is the output voltage of the generator, and is processed by a voltage stabilizing chip IC1 to output a stable voltage Uout to the electric storage unit 4, and the model of the chip IC1 can refer to model LM2596SX or TPS 5X.
Preferably, in this embodiment, the driving module 2 includes a valve driving motor 21 and a driving circuit 22, a power supply end of the driving circuit 22 is connected to a power supply output end of the power storage unit 4, a control end of the driving circuit 22 is electrically connected to the valve driving motor 21, and a valve driving shaft of the valve driving motor 21 is connected to the valve body 1.
The design of the driving circuit is also shown in fig. 5, the control of the motor is realized through 485 communication, and the forward rotation and the reverse rotation of the motor can be realized, so that the purposes of opening and closing the valve are achieved.
In the preferred embodiment shown in fig. 2, the driving circuit 22 is in communication connection with the control terminal 6 through the 4G gateway 7, and the driving circuit 22 is remotely controlled by a control platform or a mobile terminal to realize automatic control of the electrically controlled valve.
Similar to the first embodiment, the rotation direction of the generator impeller 31 of the present embodiment is: rotating around the radial center line of the steam pipeline 8 as an axis;
one end of the driving shaft 33 is fixedly connected with the wheel core of the generator impeller 31, and the other end of the driving shaft 33 extends out of the steam pipeline 8 and is fixedly connected with the generator 32.
The drive shaft 33 is connected to the wall of the steam pipe 8 in a sealing manner.
Example three:
referring to fig. 3, the present embodiment provides a self-powered vapor control valve assembly comprising: valve body 1, drive module 2, steam power generation module 3, electric power storage unit 4 and voltage stabilizing unit 5, wherein:
the valve body 1 is used for controlling the steam flow of the steam pipeline 8;
the driving module 2 is used for controlling the opening degree of the valve body 1;
the steam power generation module 3 is used for converting steam kinetic energy in the steam pipeline 8 into electric energy and supplying power to the driving module 2;
the electric power storage unit 4 and the voltage stabilizing unit 5 are used for receiving and storing the electric energy generated by the steam power generation module 3 and providing stable voltage for the driving module 2, the electric power storage unit 4 can be a common storage battery, and the voltage stabilizing unit 5 can be regarded as a charger of the storage battery;
the valve body 1 is fixedly arranged in a steam pipeline 8 and is electrically connected with the driving module 2, a generator impeller 31 of the steam power generation module 3 is fixedly arranged in the steam pipeline 8, the blade driving direction of the generator impeller 31 is consistent with the steam flow direction in the steam pipeline 8, and the generator impeller 31 is connected with a generator 32 of the steam power generation module 3 through a driving shaft 33;
the steam power generation module 3, the voltage stabilizing unit 5 and the electric storage unit 4 are connected in sequence, that is, the power transmission end of the generator of the steam power generation module 3 is connected with the input end of the voltage stabilizing unit 5, the output end of the voltage stabilizing unit 5 is connected with the electric storage input end of the electric storage unit 4, and the power supply output end of the electric storage unit 4 is connected with the power supply end of the driving module 2.
Referring to fig. 4, the circuit implementation of the voltage stabilizing unit 5 also refers to, the left input voltage Uin is the output voltage of the generator, and is processed by a voltage stabilizing chip IC1 to output a stable voltage Uout to the electric storage unit 4, and the chip IC1 may be selected according to model No. LM2596SX or TPS 5X.
Preferably, in this embodiment, the driving module 2 includes a valve driving motor 21 and a driving circuit 22, a power supply end of the driving circuit 22 is connected to a power supply output end of the power storage unit 4, a control end of the driving circuit 22 is electrically connected to the valve driving motor 21, and a valve driving shaft of the valve driving motor 21 is connected to the valve body 1.
The design of the driving circuit is also shown in fig. 5, the control of the motor is realized through 485 communication, and the forward rotation and the reverse rotation of the motor can be realized, so that the purposes of opening and closing the valve are achieved.
In the preferred embodiment shown in fig. 3, the driving circuit 22 is in communication connection with the control terminal 6 through the 4G gateway 7, and the driving circuit 22 is remotely controlled by a control platform or a mobile terminal to realize automatic control of the electrically controlled valve.
Different from the first and second embodiments, the rotation direction of the generator impeller 31 of the present embodiment is: the generator impeller 31 rotates around the axial center line of the steam pipeline 8 as a shaft, and the blades of the generator impeller 31 form an included angle of theta degrees with the steam flow direction in the steam pipeline 8;
the rotating axis of the impeller of the generator is consistent with the flowing direction of steam, namely the impeller is opposite to the steam, the steam airflow blows the blades from the front, the impeller rotates like a windmill, the blades need to form a certain inclination angle with the steam, the inclination angle is better at 75 degrees, and at the moment, the wheel core of the impeller is superposed with the axis of the steam pipeline, and the driving shaft needs to be designed to turn.
The preferred design is as follows:
the driving shaft 33 comprises a first driving shaft 331 and a second driving shaft 332, wherein one end of the first driving shaft 331 is fixedly connected with the core of the generator impeller 31, the other end of the first driving shaft 331 is connected with one end of the second driving shaft 332 through a steering gear 333, and the other end of the second driving shaft 332 extends out of the steam pipeline 8 and is fixedly connected with the generator 32.
The steering gear comprises 2 helical gears with included angles of 90 degrees, so that a first driving shaft is formed to drive a second driving shaft to synchronously rotate when rotating, and finally a rotor of the generator rotates to generate electricity.
The second drive shaft 332 is connected to the wall of the steam pipe 8 in a sealing manner.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Of course, the units and modules may be replaced by a processor containing a computer program, and the work of each part can be completed in a pure software form
Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method can be implemented in other manners. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A self-powered vapor control valve device, comprising:
the valve body is used for controlling the steam flow of the steam pipeline;
the driving module is used for controlling the opening degree of the valve body;
the steam power generation module is used for converting the kinetic energy of the steam in the steam pipeline into electric energy and supplying power to the driving module;
the valve body is fixedly installed in a steam pipeline and electrically connected with the driving module, a generator impeller of the steam power generation module is fixedly installed in the steam pipeline, the blade driving direction of the generator impeller is consistent with the steam flow direction in the steam pipeline, the generator impeller is connected with a generator of the steam power generation module through a driving shaft, and the generator is electrically connected with the driving module.
2. The self-powered steam control valve assembly as recited in claim 1, further comprising an accumulator unit disposed between the drive module and the steam generator module, wherein an accumulator input of the accumulator unit is coupled to the generator power terminal of the steam generator module, and wherein a power output of the accumulator unit is coupled to the power supply terminal of the drive module.
3. The self-powered steam control valve assembly as recited in claim 2, further comprising a voltage regulator unit disposed between the power storage unit and the steam generator module, wherein an input of the voltage regulator unit is connected to the power generator terminal of the steam generator module, and an output of the voltage regulator unit is connected to the power storage input of the power storage unit.
4. The self-powered vapor control valve assembly of claim 1, wherein the drive module comprises a valve drive motor and a drive circuit, a power supply terminal of the drive circuit is coupled to the vapor generation module, a control terminal of the drive circuit is electrically coupled to the valve drive motor, and a valve drive shaft of the valve drive motor is coupled to the valve body.
5. The self-powered vapor control valve assembly of claim 4, wherein the drive circuit is further communicatively coupled to a control terminal, the control terminal configured to initiate a control command.
6. The self-powered vapor control valve assembly of claim 1, wherein the generator impeller rotates in a direction of: rotating along the radial central line of the steam pipeline as an axis;
one end of the driving shaft is fixedly connected with a wheel core of the generator impeller, and the other end of the driving shaft extends out of the steam pipeline and is fixedly connected with the generator.
7. The self-powered vapor control valve assembly of claim 1, wherein the generator impeller rotates in a direction of: the steam generator rotates by taking the axial center line of the steam pipeline as a shaft, and the blades of the generator impeller and the steam flow direction in the steam pipeline form an included angle of theta degrees;
the driving shaft comprises a first driving shaft and a second driving shaft, wherein one end of the first driving shaft is fixedly connected with a wheel core of the generator impeller, the other end of the first driving shaft is connected with one end of the second driving shaft through a steering gear, and the other end of the second driving shaft extends out of the steam pipeline and is fixedly connected with the generator.
8. The self-powered vapor control valve assembly of claim 6 or 7, wherein the drive shaft is sealingly coupled to a wall of the vapor conduit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922327380.0U CN211449813U (en) | 2019-12-20 | 2019-12-20 | Self-powered steam control valve device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922327380.0U CN211449813U (en) | 2019-12-20 | 2019-12-20 | Self-powered steam control valve device |
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| CN211449813U true CN211449813U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115342222A (en) * | 2022-08-10 | 2022-11-15 | 广东电网有限责任公司 | Valve closing device and main transformer |
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2019
- 2019-12-20 CN CN201922327380.0U patent/CN211449813U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115342222A (en) * | 2022-08-10 | 2022-11-15 | 广东电网有限责任公司 | Valve closing device and main transformer |
| CN115342222B (en) * | 2022-08-10 | 2024-03-08 | 广东电网有限责任公司 | Valve closing device and main transformer |
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