Positioner for power plant control valves

Abstract

The present invention discloses a positioner for controlling a valve of a power plant. The disclosed positioner for controlling a valve of a power plant is characterized by comprising: a main body having one side open, a cable connection port portion for connecting a signal cable on one side, and a gauge mounting portion formed through the other side; a positioner block coupled to the interior of the main body to allow a sensor cable to be connected through the cable connection port portion, which receives a signal from the outside and controls the opening of a valve and an actuator; a gauge block mounted to the main body through the gauge mounting portion to be connected to the positioner block, and having an air hole portion formed to connect an external pneumatic line portion; a protective plate portion coupled to the interior of the main body to cover the upper side of the positioner block and the gauge block; a PCB coupled to the protective plate portion to be located above the protective plate portion and having a display portion; and a cover portion coupled to the main body to cover the opening of the main body.

Description

Technology Field

[0001] The present invention relates to a positioner for valve control in a power plant, and more specifically, to a positioner for valve control in a power plant in which a protective plate portion is installed on the upper side of a positioner block and a gauge block, and a PCB is coupled to the upper part of the protective plate portion to prevent the PCB from being damaged by pressure generated during operation, thereby improving operational safety, and which can be used under various types of fluids and pressure conditions, thereby improving convenience of use. Background Technology

[0003] Generally, thermal power generation is a method of generating electricity that converts chemical energy from sources such as petroleum, coal, and natural gas into mechanical energy, which is then converted into electrical energy by a generator. Typically, fuel is burned in a boiler to generate steam, which is then used to obtain mechanical energy from a turbine, and finally converted into electricity by a generator directly connected to the turbine.

[0004] Meanwhile, Integrated Gasification Combined Cycle (IGCC) is an eco-friendly power generation technology that produces electricity by gasifying coal at high temperature and pressure. It converts coal into synthesis gas composed mainly of hydrogen and carbon monoxide, removes harmful substances such as dust and sulfur oxides contained in the synthesis gas, and purifies it to a level similar to natural gas. Subsequently, it generates electricity by driving a gas turbine using the hydrogen and carbon monoxide in the synthesis gas and operating a steam turbine using the heat from the exhaust gases generated during the process.

[0005] Various measuring instruments are used for safety in coal gasification combined cycle (IGCC) power generation, and diverse purge systems are applied to prevent the deterioration of measurement precision caused by the accumulation of synthetic gas and foreign substances in the lines connecting to these instruments. Furthermore, the purge systems used in Integrated Gasification Combined Cycle (IGCC) generally utilize nitrogen (N2) or water depending on the installation location and the type of substance to be removed, and valve systems suitable for the pressure conditions at the point of use are employed.

[0006] A conventional valve system is designed to control high-temperature, high-pressure fluids flowing through various pipes installed in large plants, such as power plants. It not only controls the flow rate, pressure, and direction of the fluid but also performs key functions such as opening and closing the flow path, throttling, backing, and preventing overpressure. To ensure stability in such valve systems, a valve positioner, known as an automatic valve position controller, may be installed.

[0007] Valve positioners can control the irregular operation of temperature and motion controllers in proportion to changes in various parameters of the valve system, and can ensure that the operation of pressure controllers is accurate and rapid. Positioners can be classified according to their input signals into electro-pneumatic positioners, which receive electrical signals and control valve opening and closing based on the magnitude of those signals, and pneumatic positioners, which receive air pressure as the input signal and control the operation.

[0008] However, the valve positioner of the conventional technology described above has the problem of frequent malfunctions and reduced durability because it transports high-temperature, high-pressure fluids due to the characteristics of power plants. Prior art literature

[0010] Republic of Korea Registered Patent No. 10-2012116 (Registration Date: 2019.08.12) Republic of Korea Registered Patent No. 10-1231924 (Registration Date: 2013.02.04) The problem to be solved

[0011] The present invention was created in response to the aforementioned necessity, and aims to provide a positioner for valve control in a power plant that can improve operational safety by installing a protective plate section on the upper side of a positioner block and a gauge block and connecting a PCB to the upper part of the protective plate section to prevent pneumatic pressure generated during operation from being transmitted to the PCB, as well as improve convenience of use by enabling use under various types of fluid and pressure conditions. means of solving the problem

[0013] To achieve the above-mentioned purpose, a positioner for valve control of a power plant according to one aspect of the present invention comprises: a main body having one side open, a cable connection port portion for connecting a signal cable on one side, and a gauge mounting portion formed through the other side; a positioner block coupled to the interior of the main body to allow a sensor cable to be connected through the cable connection port portion, and which receives a signal from the outside to adjust the opening of a valve and an actuator; a gauge block mounted to the main body through the gauge mounting portion to be connected to the positioner block, and having an air hole portion formed to connect an external pneumatic line portion; a protective plate portion coupled to the interior of the main body to cover the upper side of the positioner block and the gauge block; a PCB coupled to the protective plate portion to be located on the upper side of the protective plate portion and having a display portion; and a cover portion coupled to the main body to cover the opening of the main body.

[0014] In addition, the main body of the present invention is characterized in that a block mounting protrusion is formed on the inner bottom surface for mounting the positioner block, a block fastening hole for fastening a bolt or screw is formed through the block mounting protrusion, and a judgment boss is formed on the inner side.

[0015] In addition, the positioner block in the present invention is characterized by having a body support projection formed protruding from its lower surface, which contacts and is supported by the body, and a body fixing hole formed through it, which communicates with the block fastening hole.

[0016] In addition, the main body of the present invention is characterized by having a cable connection hole portion for connecting an external cable connected to the PCB.

[0017] In addition, the protective plate portion of the present invention is characterized by having a cable wiring protection portion to protect the control cable while the external cable is connected to the PCB through the cable connection hole portion.

[0018] In addition, the PCB in the present invention is characterized by having a connection terminal for connecting a control cable on one side surface.

[0019] In addition, the protective plate portion of the present invention is characterized by having a PCB fastening projection portion provided on the upper surface to fix the PCB through fastening with a screw, and a terminal placement groove portion on one side for the placement of the connection terminal.

[0020] In addition, the cable wiring protection part of the present invention is characterized by being formed as a rectangular depression with an upper surface and one side surface open, and covering the cable connection part through the open one side surface.

[0021] In addition, the gauge block in the present invention is characterized by comprising a positioner contact portion inserted into the interior of the main body through the gauge mounting portion and contacting the positioner block, and a pneumatic line connection portion formed to be extended and stepped from the positioner connection portion, supported by the gauge mounting portion, and to which the pneumatic line portion is coupled. Effects of the invention

[0023] As described above, unlike the prior art, the positioner for valve control of a power plant according to one aspect of the present invention has a protective plate portion coupled to the main body such that the protective plate portion is positioned above the positioner block and the gauge block, and a PCB is coupled to the upper part of the protective plate portion so that the PCB can be separated from the pneumatic product, thereby preventing pneumatic pressure generated during operation from being transmitted to the PCB, and thus has the effect of improving the operational safety of the PCB.

[0024] In addition, according to one aspect of the present invention, a positioner for valve control of a power plant has the effect of improving convenience of use by allowing the external cable connected to a PCB from the outside of the main body to be routed into the interior of the cable wiring protection part, thereby enabling use under various types of fluid and pressure conditions as well as ensuring safety. Brief explanation of the drawing

[0026] FIG. 1 is a schematic diagram illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 2 is a perspective view illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 3 is a rear perspective view illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 4 is a bottom perspective view illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 5 is an exploded perspective view illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating a positioner for valve control of a power plant according to one embodiment of the present invention. FIG. 7 is a cross-sectional view in another direction to illustrate a positioner for valve control of a power plant according to one embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, a preferred embodiment of a positioner for valve control of a power plant according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation.

[0028] Furthermore, the terms described below are defined in consideration of their functions in the present invention, and these may vary depending on the intent or practice of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0029] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0030] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0031] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0032] FIG. 1 is a schematic diagram illustrating a positioner for valve control of a power plant according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating a positioner for valve control of a power plant according to an embodiment of the present invention, FIG. 3 is a rear perspective view illustrating a positioner for valve control of a power plant according to an embodiment of the present invention, and FIG. 4 is a bottom perspective view illustrating a positioner for valve control of a power plant according to an embodiment of the present invention.

[0033] In addition, FIG. 5 is an exploded perspective view for explaining a positioner for valve control of a power plant according to one embodiment of the present invention, FIG. 6 is a cross-sectional view for explaining a positioner for valve control of a power plant according to one embodiment of the present invention, and FIG. 7 is a cross-sectional view in another direction for explaining a positioner for valve control of a power plant according to one embodiment of the present invention.

[0034] Referring to FIGS. 1 to 7, a positioner (100) for valve control of a power plant according to one embodiment of the present invention may largely include a main body (110), a positioner block (120), a gauge block (130), a protective plate part (140), a PCB (150), and a cover part (160).

[0035] The valve control positioner (100) of the power plant according to this embodiment can control the opening and closing of a valve (10) that controls the transfer of high-temperature, high-pressure fluid in a power plant, etc. For example, the valve (10) is equipped with a linear actuator (20), and the operation of the linear actuator (20) can be controlled by a position sensor (30).

[0036] Additionally, the valve (10) and the position sensor (30) can be controlled by a valve control positioner (100) of the power plant. To ensure the safety of the valve control positioner (100) of the power plant, the valve control positioner (100) of the power plant is installed spaced apart from the valve (10) and can transmit and receive control signals by connecting to the valve (10) and the position sensor (30) through a sensor cable (101) and an external cable (103), etc. Such a valve control positioner (100) of the power plant can be installed on a bracket part, etc., spaced apart from the valve (10) through a main body (110).

[0037] The main body (110) accommodates a positioner block (120), a protective plate part (140), and a PCB (150) inside, and a gauge block (130) may be coupled to one side. Additionally, an open side of the main body (110) may be sealed by a cover part (160).

[0038] Specifically, the main body (110) has one side open and is provided with a cable connection port (111) for connecting an external cable (103) on one side, and a gauge mounting part (112) can be formed through the other side in a rectangular shape.

[0039] Additionally, the main body (110) may have a block mounting protrusion (113) formed protruding from the inner bottom surface where a positioner block (120) is mounted, and a block fastening hole (114) for fastening a bolt or screw may be formed through the block mounting protrusion (113). Furthermore, the main body (110) may have a judgment boss (115) formed on the inner side, and the protective plate (140) may be mounted on the judgment boss (115) and fixed to the judgment boss (115) by fastening a screw.

[0040] The main body (110) may have a plate support end (116) formed at a stepped height on its inner surface to more securely and firmly fix and support the protective plate portion (140). Additionally, the main body (110) may have a cable connection hole (117) formed through it for connecting an external cable (103) connected to a PCB (150).

[0041] Additionally, the positioner block (120) can be fixed by being seated on the block mounting protrusion (113) and can be connected to the sensor cable (101) through the cable connection port (111). This positioner block (120) can receive an external signal and control the degree of opening and closing of the valve (10) and the actuator.

[0042] For example, the positioner block (120) processes a signal coming from the outside through the sensor cable (101) and can accurately adjust the position by monitoring the position of the valve (10) and the actuator in real time.

[0043] Additionally, the positioner block (120) may have a body support protrusion (121) that contacts and is supported by the inner surface of the main body (110) on its lower surface, and a main body fixing hole (123) that communicates with the block fastening hole (114) formed through it. Through this, the inner and outer parts of the positioner block (120) can be reliably protected from mechanical shock or the external environment, and stable operation is possible even in extreme environments such as high temperature and high pressure.

[0044] The gauge block (130) is mounted on the main body (110) via a gauge mounting portion so as to be connected to the positioner block (120), and an external pneumatic line portion (105) may be connected. This gauge block (130) is intended for the operation of the positioner (100) together with the positioner block (120), and is connected to the pneumatic line portion (105) for controlling the valve (10) and the actuator to supply pneumatic pressure for signal processing of the positioner block (120).

[0045] Additionally, the gauge block (130) may be formed with a plurality of pneumatic line connection holes (131) and a positioner connection hole (133) that is coupled to the positioner block (120), and may be coupled to the gauge mounting part (112) and come into contact with one surface of the positioner block (120). For example, the gauge block (130) may be provided with a positioner contact part (135) that is inserted into the interior of the main body (110) through the gauge mounting part (112) and comes into contact with the positioner block (120), and a pneumatic line connection part (137) that is extended and formed with a step difference from the positioner contact part (135) and is supported by the gauge mounting part (112) from the outside of the main body (110).

[0046] That is, the gauge block (130) can be formed with a positioner contact portion (135) extending stepwise from the pneumatic line connection portion (137) and can be formed in a rectangular shape. At this time, the gauge block (130) can have a pneumatic line connection hole portion (131) and a positioner coupling hole portion (133) formed through the positioner contact portion (135) and the pneumatic line connection portion (137).

[0047] In this way, the positioner block (120) and the gauge block (130) can control the opening of the actuator by processing control signals so that the valve (10) and the actuator can be precisely controlled. For example, the gauge block (130) supplies the pressure required for control to the positioner block (120) uniformly and stably through the pneumatic line section (105), and the positioner block (120) can control the valve (10) and the actuator by processing the signal through this.

[0048] The protective plate portion (140) can be coupled and supported to the plate support portion (116) and the combined boss portion (115) of the main body (110) to cover the upper side of the positioner block (120) and the gauge block (130). This protective plate portion (140) can improve durability and safety by preventing the pneumatic pressure of the positioner block (120) and the gauge block (130) from being transmitted to the PCB (150).

[0049] Additionally, the protective plate portion (140) may be provided with a cable wiring protection portion (141) to protect the connection of an external cable (103) connected to the PCB (150) through a cable connection hole portion (117). Furthermore, the protective plate portion (140) may be provided with a PCB connection projection portion (143) on its upper surface to secure the PCB (150) by fastening a screw, and a terminal placement groove portion (145) may be provided on one side for the placement of a connection terminal (151). At this time, the connection terminal (151) of the PCB (150) may be inserted into the terminal placement groove portion (145).

[0050] The cable wiring protection section (141) may be formed by being recessed in the protection plate section (140) to have a rectangular shape with an open top surface and one side surface corresponding to the cable connection hole section (117). At this time, the open side surface of the cable wiring protection section (141) may communicate with the cable connection hole section (117), and an external cable (103) may be connected to the PCB through the open top surface. Through this cable wiring protection section (141), the pneumatic pressure transmitted from the lower side of the protection plate section (140) to the PCB (150) can be blocked.

[0051] That is, the protective plate portion (140) is located above the positioner block (120) and the gauge block (130) to protect the PCB (150), thereby stably protecting the components and elements of the PCB (150) from the external environment.

[0052] A PCB (150) is coupled to a PCB connection protrusion (143) of a protective plate (140) so as to be positioned on the upper part of the protective plate (140), and can be connected to an external cable (103) and a control cable (107). This PCB (150) may have a display unit (153) on its upper surface and a connection terminal (151) for connecting the control cable (107) on one side of its lower surface. At this time, the connection terminal (151) can be inserted into a terminal placement groove (145) of the protective plate (140). And control signals of a positioner block (120) and a gauge block (130) can be transmitted and received through the control cable (107).

[0053] The cover portion (160) is coupled to the main body (110) to cover the opening of the main body (110), and the display exposure portion (161) can be formed through the exposure of the display portion (153).

[0054] The valve control positioner (100) of the power plant according to the present invention, configured as described above, can have the protective plate portion (140) connected to the main body (110) using the plate connection boss portion (115) and the plate support end portion (116) of the main body (110) so that the protective plate portion (140) is positioned on the upper side of the positioner block (120) and the gauge block (130), and can have the PCB (150) connected to the PCB connection protrusion (143) of the protective plate portion (140).

[0055] Through this, the PCB (150) installed in the main body (110) can be separated from the positioner block (120) and gauge block (130) connected to the pneumatic line section (105), thereby preventing pneumatic pressure generated during operation from being transmitted to the PCB (150). Accordingly, the operational safety and durability of the PCB (150) can be improved.

[0056] In addition, in the positioner (100) for valve control of a power plant according to one embodiment of the present invention, an external cable (103) connected to a PCB (150) from the outside of the main body (110) can be wired into the inside of a cable wiring protection part (141) and connected to the PCB (150), thereby stably protecting the connection points of various cables and the PCB (150), which can further improve control safety and durability. Furthermore, it can be used under various types of fluids and pressure conditions, which can improve convenience of use.

[0057] In addition, in the positioner (100) for valve control of a power plant according to one embodiment of the present invention, the positioner block (120) and the gauge block (130) are fixed and fastened to the block mounting protrusion (113) and the gauge mounting part (112) of the main body (110), thereby further enhancing structural safety and bonding strength, and making maintenance and inspection easier. Furthermore, by fastening the block fastening hole part (114) of the main body (110) and the main body fixing hole part (123) of the positioner block (120) with screws or bolts, the work of separating and replacing each part of the device can be easily performed.

[0058] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0059] Therefore, the true technical scope of protection of the present invention should be determined by the patent claims. Explanation of the symbols

[0061] 100: Positioner for power plant valve control 10: Valve 30 : Position sensor 101 : Sensor cable 103 : External cable 105 : Pneumatic line section 111: Cable connection port 112: Gauge mounting section 113: Block seating protrusion 114: Block fastening hole 115: Judgment joint boss section 116: Plate support end section 117 : Cable connection hole 120 : Positioner block 121: Main body support protrusion 123: Main body fixing hole 130: Gauge block 131: Pneumatic line connection hole 133: Positioner coupling hole 135: Positioner contact part 137 : Pneumatic line connection part 140 : Protective plate part 141 : Cable wiring protection part 143 : PCB connection protrusion part 145 : Terminal Batch Home 150 : PCB 151 : Connection terminal 160 : Cover section 161 : Display exposure area

Claims

Claim 1 A positioner for valve control in a power plant, characterized by comprising: a main body having one side open, a cable connection port portion for connecting a signal cable on one side, and a gauge mounting portion formed through the other side; a positioner block coupled to the interior of the main body to allow a sensor cable to be connected through the cable connection port portion, and which receives a signal from the outside to adjust the opening of a valve and an actuator; a gauge block mounted to the main body through the gauge mounting portion to be connected to the positioner block, and having an air hole portion formed to connect an external pneumatic line portion; a protective plate portion coupled to the interior of the main body to cover the upper side of the positioner block and the gauge block; a PCB coupled to the protective plate portion to be positioned above the protective plate portion and having a display portion; and a cover portion coupled to the main body to cover the opening of the main body. Claim 2 A positioner for valve control of a power plant according to claim 1, wherein the main body has a block mounting protrusion formed on an inner bottom surface for mounting the positioner block, a block fastening hole formed through the block mounting protrusion for fastening a bolt or screw, and a plate-joining boss formed on an inner side, and the positioner block has a main body support protrusion formed protruding from a lower surface for contacting and supporting the main body, and a main body fixing hole formed through the block fastening hole that communicates with the block fastening hole. Claim 3 A positioner for valve control of a power plant, characterized in that, in claim 2, the main body has a cable connection hole portion for connecting an external cable connected to the PCB, and the protective plate portion has a cable wiring protection portion to protect the control cable while the external cable is connected to the PCB through the cable connection hole portion. Claim 4 A positioner for valve control of a power plant according to claim 3, wherein the PCB is provided with a connection terminal for connecting a control cable on one side surface, and the protective plate portion is characterized by having a PCB fastening projection portion provided on the upper surface to fix the PCB through fastening with a screw, and a terminal placement groove portion on one side for placing the connection terminal. Claim 5 A positioner for valve control of a power plant, characterized in that, in claim 3, the cable wiring protection part is formed as a rectangular depression with an open top surface and one side surface, and covers the cable connection part through the open side surface. Claim 6 A positioner for valve control of a power plant, characterized in that, in any one of claims 1 to 5, the gauge block comprises: a positioner contact portion inserted into the interior of the main body through the gauge mounting portion and contacting the positioner block; and a pneumatic line connection portion formed to be extended and stepped apart from the positioner connection portion, supported by the gauge mounting portion, and to which the pneumatic line portion is coupled.

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