CN218913196U - Misoperation-preventing tripping control device and system for steam feed pump - Google Patents
Misoperation-preventing tripping control device and system for steam feed pump Download PDFInfo
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- CN218913196U CN218913196U CN202320074522.0U CN202320074522U CN218913196U CN 218913196 U CN218913196 U CN 218913196U CN 202320074522 U CN202320074522 U CN 202320074522U CN 218913196 U CN218913196 U CN 218913196U
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- 230000009970 fire resistant effect Effects 0.000 claims abstract description 68
- 230000002265 prevention Effects 0.000 claims description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 230000007257 malfunction Effects 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- 238000012986 modification Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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Abstract
The application discloses steam feed pump anti-misoperation tripping control device and steam feed pump control system, including first solenoid valve group, the second solenoid valve group, first uninstallation valve, second uninstallation valve and controller, wherein, the control end of first solenoid valve group and second solenoid valve group all is connected with the control end electricity of controller, the input of first solenoid valve group, the output is connected with first fire-resistant oil branch road, the input of second solenoid valve group respectively, the output of second solenoid valve group is connected with fire-resistant oil return circuit, the output of first uninstallation valve, the control end is connected with the output of first solenoid valve group respectively, the input of first uninstallation valve and the input of second uninstallation valve are connected with second fire-resistant oil branch road respectively, steam feed pump main valve and steam feed pump make-up valve, the output of second uninstallation valve, the control end is connected with the output of second solenoid valve group respectively, the input. The possibility of tripping misoperation of the steam feed pump is reduced, and the running stability of the unit is improved.
Description
Technical Field
The utility model belongs to the technical field of water feed pumps, and particularly relates to a misoperation trip prevention control device of a steam feed pump and a steam feed pump control system.
Background
The large-scale unit in the thermal power plant adopts an electric water supply pump and a steam water supply pump to add water for the boiler, and the electric water supply pump drives a motor to rotate through station power, so that the water supply pump is driven to rotate to supply water to the side of the boiler. The steam feed pump is driven by the steam extraction of the steam turbine to drive the rotation of the water pump to feed water to the side of the boiler.
The main valve of the steam feed pump and the steam feed pump make-up valve are arranged on the main valve of the steam feed pump and are connected with two stop solenoid valves on the fire-resistant oil branch, when any stop solenoid valve loses power, the quick-closing assembly on the main valve of the steam feed pump and the steam feed pump make-up valve acts, so that the main valve of the steam feed pump and the steam feed pump make-up valve are quickly turned off, and the steam feed pump is tripped.
The connection mode has the following hidden trouble: any one of the shutdown solenoid valves fails or the tripping circuit power supply of any one of the shutdown solenoid valves is lost, so that the main valve of the steam feed pump and the auxiliary valve of the steam feed pump are rapidly turned off, and the main valve and the auxiliary valve are turned off to cause the steam feed pump to trip by misoperation, so that the water feed flow is low, the tripping of main fuel of the boiler is caused, the tripping of a unit is caused, and the safety risk of the unit is high.
Disclosure of Invention
In view of the above, the utility model provides a control device and a control system for preventing misoperation tripping of a steam-driven water supply pump, which mainly aims to solve the problem of misoperation tripping of the steam-driven water supply pump of the existing thermal power plant.
In order to solve the problems, the application provides a malfunction tripping control device for a steam feed pump, which comprises a first electromagnetic valve group, a second electromagnetic valve group, a first unloading valve, a second unloading valve and a controller, wherein,
the control end of the first electromagnetic valve bank is electrically connected with the first control end of the controller, the input end of the first electromagnetic valve bank is connected with a first fire-resistant oil branch, the output end of the first electromagnetic valve bank is connected with the input end of the second electromagnetic valve bank, the output end of the second electromagnetic valve bank is connected with a fire-resistant oil loop, the control end of the second electromagnetic valve bank is electrically connected with the second control end of the controller, the input end of the first unloading valve is respectively connected with a second fire-resistant oil branch, a steam feed pump main valve and a steam feed pump supplementary valve, the output end of the first unloading valve is connected with the output end of the first electromagnetic valve bank, the control end of the first unloading valve is connected with the input end of the first electromagnetic valve bank, the input end of the second unloading valve is respectively connected with a second fire-resistant oil branch, a steam feed pump main valve and a steam feed pump supplementary valve, the output end of the second unloading valve is connected with the output end of the second electromagnetic valve, and the control end of the second unloading valve is connected with the input end of the second electromagnetic valve bank.
In one embodiment of the present utility model, optionally, the first solenoid valve group includes a first solenoid valve and a second solenoid valve, and the first solenoid valve and the second solenoid valve are connected in parallel.
In one embodiment of the present utility model, optionally, the second solenoid valve group includes a third solenoid valve and a fourth solenoid valve, and the third solenoid valve and the fourth solenoid valve are connected in parallel.
In one embodiment of the present utility model, optionally, when at least one solenoid valve in the first solenoid valve group and at least one solenoid valve in the second solenoid valve group are simultaneously powered off, the main valve of the steam feed pump and the supplementary valve of the steam feed pump are closed.
In one embodiment of the utility model, optionally, the main valve of the steam feed pump is provided with a first speed-off assembly, and the supplementary valve of the steam feed pump is provided with a second speed-off assembly.
In one embodiment of the present utility model, optionally, the malfunction trip prevention control apparatus for a steam feed pump further includes a first speed-off leg and a second speed-off leg, wherein a first end of the first speed-off leg is connected to the first speed-off component, a second end of the first speed-off leg is connected to the second fire-resistant oil leg, a first end of the second speed-off leg is connected to the second speed-off component, and a second end of the second speed-off leg is connected to the second fire-resistant oil leg.
In one embodiment of the present utility model, optionally, a pressure sensor is disposed between the output end of the first electromagnetic valve group and the input end of the second electromagnetic valve group.
In one embodiment of the present utility model, optionally, the malfunction trip prevention control apparatus for a steam feed pump further includes: the oil pump is arranged in the oil tank, the oil pump is connected with the fire-resistant oil main circuit, the fire-resistant oil main circuit is further connected with the first fire-resistant oil branch circuit and the second fire-resistant oil branch circuit, and the oil tank is further connected with the fire-resistant oil loop.
In one embodiment of the present utility model, optionally, the main steam valve of the steam feed pump and the supplementary steam valve of the steam feed pump are both connected with the steam feed pump.
The utility model also provides a control system of the steam-driven water feed pump, which comprises the control device for preventing misoperation and tripping of the steam-driven water feed pump.
The beneficial effects in this application: according to the anti-misoperation tripping control device and the anti-misoperation tripping control system for the steam-driven water supply pump, provided by the utility model, the first electromagnetic valve group and the second electromagnetic valve group are arranged, only at least one electromagnetic valve in the first electromagnetic valve group and at least one electromagnetic valve in the second electromagnetic valve group are simultaneously powered off, the main valve of the steam-driven water supply pump and the steam-driven water supply pump steam supplementing valve are closed, and then the steam-driven water supply pump trips, so that the possibility of tripping misoperation of the steam-driven water supply pump is reduced, and the running stability of a unit is improved.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a block diagram of a malfunction trip prevention control apparatus for a steam feed pump according to an exemplary embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a first electromagnetic valve group and a second electromagnetic valve group of a malfunction trip prevention control device for a steam feed pump according to an exemplary embodiment of the present utility model;
wherein,,
the reference numerals of fig. 1-2 are as follows: 11-a first solenoid valve group, 12-a second solenoid valve group, 13-a first unloading valve, 14-a second unloading valve; 15-a controller; 20-a first fire resistant oil branch; 30-fire-resistant oil loop source; 40-a second fire resistant oil branch; 50-a main valve of a steam feed pump; 60-a steam feed pump steam supplementing valve; 111-a first solenoid valve; 112-a second solenoid valve; 121-a third solenoid valve; 122-fourth solenoid valve.
Detailed Description
The utility model will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In order to further describe the technical means and effects adopted for achieving the preset aim of the utility model, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the application of the utility model with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The following describes, with reference to fig. 1 to 2, a malfunction trip prevention control apparatus for a steam feed pump according to some embodiments of the present utility model.
In one embodiment, as shown in fig. 1, a device for controlling a tripping operation of a steam feed pump in a malfunction manner includes a first electromagnetic valve bank 11, a second electromagnetic valve bank 12, a first unloading valve 13, a second unloading valve 14 and a controller 15, wherein a control end of the first electromagnetic valve bank 11 is electrically connected to a first control end of the controller 15, an input end of the first electromagnetic valve bank 11 is connected to a first fire-resistant oil branch 20, an output end of the first electromagnetic valve bank 11 is connected to an input end of the second electromagnetic valve bank 12, an output end of the second electromagnetic valve bank 12 is connected to a fire-resistant oil circuit 30, a control end of the second electromagnetic valve bank 12 is electrically connected to a second control end of the controller 15, an input end of the first unloading valve 13 is respectively connected to a second fire-resistant oil branch 40, a main steam feed pump 50 and a main steam feed pump 60, an output end of the first unloading valve 13 is connected to an output end of the first electromagnetic valve bank 11, an input end of the second unloading valve 14 is respectively connected to an input end of the second electromagnetic valve bank 14, an input end of the second unloading valve 14 is connected to an output end of the second fire-resistant oil branch valve bank 14 and an output end of the second electromagnetic valve 14 is connected to the second control valve feed pump.
Specifically, when at least one electromagnetic valve in the first electromagnetic valve bank and at least one electromagnetic valve in the second electromagnetic valve bank are powered off simultaneously, the electromagnetic valves in the first electromagnetic valve bank are communicated, oil of the first anti-fuel branch flows into the input end of the second electromagnetic valve bank through the electromagnetic valves communicated in the first electromagnetic valve bank, so that the oil pressure of the control end of the first unloading valve is reduced, the first unloading valve is communicated, oil of the second anti-fuel branch flows into the input end of the second electromagnetic valve bank through the first unloading valve, and due to the electromagnetic valves communicated in the second electromagnetic valve bank, oil flowing out of the first electromagnetic valve bank flows into the anti-fuel loop through the electromagnetic valves communicated in the second electromagnetic valve bank, so that the oil pressure of the control end of the second unloading valve is reduced, the oil of the second anti-fuel branch flows into the anti-fuel loop through the second unloading valve, the oil pressure of the second anti-fuel branch is lower, so that the main steam feed pump is closed, and the steam feed pump is further tripped.
Compared with the prior art, the anti-misoperation tripping control device for the steam-driven water supply pump is provided with the first electromagnetic valve group and the second electromagnetic valve group, and only at least one electromagnetic valve in the first electromagnetic valve group and at least one electromagnetic valve in the second electromagnetic valve group are simultaneously powered off, the main valve of the steam-driven water supply pump and the auxiliary valve of the steam-driven water supply pump are closed, so that the tripping of the steam-driven water supply pump is realized, the possibility of tripping misoperation of the steam-driven water supply pump is reduced, and the running stability of a unit is improved.
In one embodiment, as shown in fig. 2, the first solenoid valve group 11 includes a first solenoid valve 111 and a second solenoid valve 112, the first solenoid valve 111 and the second solenoid valve 112 are connected in parallel, the second solenoid valve group 12 includes a third solenoid valve 121 and a fourth solenoid valve 122, the third solenoid valve 121 and the fourth solenoid valve 122 are connected in parallel, and when at least one solenoid valve in the first solenoid valve group 11 and at least one solenoid valve in the second solenoid valve group 12 are simultaneously de-energized, the main steam feed pump steam valve 51 and the auxiliary steam feed pump steam valve 60 are closed.
Specifically, if the first electromagnetic valve and the second electromagnetic valve are both closed, no matter what state the third electromagnetic valve and the fourth electromagnetic valve are, the main valve of the steam feed pump and the supplementary valve of the steam feed pump are both opened. Taking the first electromagnetic valve as an example, the principle is described that the first electromagnetic valve is closed when the electromagnetic valve is in an electricity-obtaining state, namely, when the electromagnetic valve is electrified, oil at the input end of the electromagnetic valve cannot flow to the output end, and only a pipeline where the input end is located can be blocked, because the input ends of the first electromagnetic valve and the second electromagnetic valve are connected with the control end of the first unloading valve, the control end pressure of the first unloading valve is larger, and because the control end of the first unloading valve is similar to a connecting rod of a piston, the piston is pushed to move downwards when the pressure is large, so that the output end of the first unloading valve is blocked by the piston, the first unloading valve is in a closed state, and because the input end of the first unloading valve is connected with the first fire-resistant oil branch, the oil pressure in the first fire-resistant oil branch is higher, and further, the main valve of the pneumatic feed pump and the pneumatic feed pump connected with the input end of the first unloading valve bear larger oil pressure, and are in a closed connection.
When at least one electromagnetic valve in the first electromagnetic valve bank and at least one electromagnetic valve in the second electromagnetic valve bank are simultaneously powered off, the electromagnetic valves in the first electromagnetic valve bank are communicated, oil of the first fire-resistant oil branch flows into the input end of the second electromagnetic valve bank through the electromagnetic valves in the first electromagnetic valve bank, so that the oil pressure of the control end of the first unloading valve is reduced, the first unloading valve is communicated, oil of the second fire-resistant oil branch flows into the input end of the second electromagnetic valve bank through the first unloading valve, and due to the fact that the electromagnetic valves in the second electromagnetic valve bank are communicated, the oil flowing out of the first electromagnetic valve bank flows into the fire-resistant oil loop through the electromagnetic valves in the second electromagnetic valve bank, so that the oil pressure of the second fire-resistant oil branch is reduced, the oil of the second fire-resistant oil branch flows into the fire-resistant oil loop through the second unloading valve, so that the oil pressure of the main steam feed pump steam feed valve of the steam feed pump is closed, and the steam feed pump is further tripped.
The electromagnetic valve group in the prior art adopts a mode of 2 selection and 1 selection, so that misoperation is easy to cause, and the electromagnetic valve group of the application adopts a mode of 4 selection and 2 selection, so that the possibility of tripping misoperation of the steam feed pump is reduced, and the running stability of the unit is improved.
In one embodiment, the main valve of the steam feed pump is provided with a first speed-related component, the auxiliary valve of the steam feed pump is provided with a second speed-related component, the false tripping control device of the steam feed pump further comprises a first speed-related branch and a second speed-related branch, the first end of the first speed-related branch is connected with the first speed-related component, the second end of the first speed-related branch is connected with the second fire-resistant oil branch, the first end of the second speed-related branch is connected with the second speed-related component, and the second end of the second speed-related branch is connected with the second fire-resistant oil branch.
In particular, the first speed-relation assembly is connected with the second fire-resistant oil branch through the first speed-relation branch, the second speed-relation assembly is connected with the second fire-resistant oil branch through the second speed-relation branch, the input end of the first unloading valve and the input end of the second unloading valve are connected with the second fire-resistant oil branch. When the first unloading valve and the second unloading valve are in a closed state, the oil pressure in the second fire resistant oil branch, the first speed closing branch and the second speed closing branch is higher, and the first speed closing component and the second speed closing component are opened; when the first unloading valve and the second unloading valve are in a communication state, namely in a pressure relief and discharge state, oil in the first fire-resistant oil branch, the first speed-off branch and the second speed-off branch flows to the fire-resistant oil loop, and oil pressure in the second fire-resistant oil branch, the first speed-off branch and the second speed-off branch is lower, so that the first speed-off component and the second speed-off component are closed, and the further steam feed pump trips.
In one embodiment, a pressure sensor is provided between the output of the first solenoid valve block 11 and the input of the second solenoid valve block 12.
Specifically, the pressure sensor detects the oil pressure in the pipeline, and the detected oil pressure is about half of the oil pressure in the second fire-resistant oil branch, and the detected oil pressure is used for monitoring the quality of the electromagnetic valve or performing a unit trip channel test.
In one embodiment, the malfunction trip prevention control device of the steam feed pump further comprises: the oil tank, the oil pump and the fire resistant oil main way, the oil pump sets up in the oil tank, and the oil pump is connected with the fire resistant oil main way, and fire resistant oil main way still is connected with first fire resistant oil branch road 20 and second fire resistant oil branch road 40, and the oil tank still is connected with fire resistant oil return circuit 30.
In this embodiment, the fire-resistant oil main circuit is relatively complex, and the fire-resistant oil main circuit is simplified here in order to clearly define the positions and connection relations of the first fire-resistant oil branch circuit and the second fire-resistant oil branch circuit. The oil output by the oil pump flows into the fire-resistant oil main way, the fire-resistant oil main way carries out a lot of treatments on the oil, the treated oil respectively flows into the first fire-resistant oil branch way and the second fire-resistant oil branch way, when at least one electromagnetic valve in the first electromagnetic valve group and at least one electromagnetic valve in the second electromagnetic valve group are simultaneously powered off, the two electromagnetic valves are communicated, the pressure of the control ends of the first unloading valve and the second unloading valve is reduced, the first unloading valve and the second unloading valve are also communicated, the oil of the first fire-resistant oil branch way flows into the fire-resistant oil loop through the communicated electromagnetic valves, and the oil of the second fire-resistant oil branch way flows into the fire-resistant oil loop through the first unloading valve and the second unloading valve.
In one embodiment, both the main steam feed pump port 50 and the make-up steam feed pump port 60 are connected to a steam feed pump.
Specifically, a main valve and a supplementary valve are arranged on the steam feed pump, the main valve of the steam feed pump is connected with the main valve on the feed pump, the supplementary valve of the steam feed pump is connected with the supplementary valve on the feed pump, and when the main valve of the steam feed pump and the supplementary valve of the steam feed pump are closed, the steam feed pump trips.
The utility model also provides a control system of the steam-driven water feed pump, which comprises the control device for preventing misoperation and tripping of the steam-driven water feed pump.
Compared with the prior art, the control system of the steam feed pump is provided with the first electromagnetic valve group and the second electromagnetic valve group, and only at least one electromagnetic valve in the first electromagnetic valve group and at least one electromagnetic valve in the second electromagnetic valve group are powered off simultaneously, the main valve of the steam feed pump and the supplementary valve of the steam feed pump are closed, so that the steam feed pump trips, the possibility of tripping misoperation of the steam feed pump is reduced, and the running stability of a unit is improved.
It should be understood that various modifications may be made to the embodiments of the application herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of this application will occur to those skilled in the art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with a general description of the application given above and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.
It is also to be understood that, although the present application has been described with reference to some specific examples, those skilled in the art can certainly realize many other equivalent forms of the present application.
The foregoing and other aspects, features, and advantages of the present application will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application with unnecessary or excessive detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments as per the application.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.
Claims (10)
1. The false operation trip prevention control device of the steam feed pump is characterized by comprising a first electromagnetic valve group, a second electromagnetic valve group, a first unloading valve, a second unloading valve and a controller, wherein,
the control end of the first electromagnetic valve bank is electrically connected with the first control end of the controller, the input end of the first electromagnetic valve bank is connected with a first fire-resistant oil branch, the output end of the first electromagnetic valve bank is connected with the input end of the second electromagnetic valve bank, the output end of the second electromagnetic valve bank is connected with a fire-resistant oil loop, the control end of the second electromagnetic valve bank is electrically connected with the second control end of the controller, the input end of the first unloading valve is respectively connected with a second fire-resistant oil branch, a steam feed pump main valve and a steam feed pump supplementary valve, the output end of the first unloading valve is connected with the output end of the first electromagnetic valve bank, the control end of the first unloading valve is connected with the input end of the first electromagnetic valve bank, the input end of the second unloading valve is respectively connected with a second fire-resistant oil branch, a steam feed pump main valve and a steam feed pump supplementary valve, the output end of the second unloading valve is connected with the output end of the second electromagnetic valve, and the control end of the second unloading valve is connected with the input end of the second electromagnetic valve bank.
2. The false operation preventing trip control device of a steam feed pump according to claim 1, wherein the first electromagnetic valve group comprises a first electromagnetic valve and a second electromagnetic valve, and the first electromagnetic valve and the second electromagnetic valve are connected in parallel.
3. The false operation preventing trip control device of a steam feed pump according to claim 1, wherein the second electromagnetic valve group comprises a third electromagnetic valve and a fourth electromagnetic valve, and the third electromagnetic valve and the fourth electromagnetic valve are connected in parallel.
4. The false tripping control device for a steam feed pump of claim 1, wherein when at least one electromagnetic valve in the first electromagnetic valve group and at least one electromagnetic valve in the second electromagnetic valve group are simultaneously powered off, the main valve of the steam feed pump and the supplementary valve of the steam feed pump are closed.
5. The false tripping control device for a steam feed pump of claim 1, wherein the main valve of the steam feed pump is provided with a first speed-closing component, and the supplementary valve of the steam feed pump is provided with a second speed-closing component.
6. The device of claim 5, further comprising a first speed-off leg and a second speed-off leg, wherein a first end of the first speed-off leg is connected to the first speed-off assembly, a second end of the first speed-off leg is connected to the second fire-resistant oil leg, a first end of the second speed-off leg is connected to the second speed-off assembly, and a second end of the second speed-off leg is connected to the second fire-resistant oil leg.
7. The false operation preventing tripping control device of a steam feed pump according to claim 1, wherein a pressure sensor is arranged between the output end of the first electromagnetic valve group and the input end of the second electromagnetic valve group.
8. The false tripping prevention control device for a steam feed pump as defined in claim 1, further comprising: the oil pump is arranged in the oil tank, the oil pump is connected with the fire-resistant oil main circuit, the fire-resistant oil main circuit is further connected with the first fire-resistant oil branch circuit and the second fire-resistant oil branch circuit, and the oil tank is further connected with the fire-resistant oil loop.
9. The false tripping control device for a steam feed pump of claim 1, wherein the main steam valve of the steam feed pump and the supplementary steam valve of the steam feed pump are both connected with the steam feed pump.
10. A control system for a steam feed pump, comprising the false tripping prevention control device for a steam feed pump according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320074522.0U CN218913196U (en) | 2023-01-10 | 2023-01-10 | Misoperation-preventing tripping control device and system for steam feed pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320074522.0U CN218913196U (en) | 2023-01-10 | 2023-01-10 | Misoperation-preventing tripping control device and system for steam feed pump |
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