Steam metering control device based on PLC

Abstract

The utility model relates to the technical field of steam control, in particular to a PLC-based steam metering control device which comprises a steam tank, a steam pipeline, a vortex shedding flowmeter, a pressure transmitter, a transfer closed box, a concentration control assembly and a Y-shaped mechanical filter assembly, the steam pipeline is welded to one side of the steam tank, the vortex shedding flowmeter is connected to the outer side of the steam pipeline in a clamped mode, and the pressure transmitter is connected to the other side of the steam pipeline in a clamped mode. The pressure transmitter is clamped to the outer side, close to the vortex shedding flowmeter, of the steam pipeline, and the inner surface of the transfer closed box is tightly attached to the other side of the steam pipeline. According to the steam metering control device based on the PLC, the electric heating pipe is driven to rotate and heat through the concentration control assembly, so that the degree of superheat is evenly increased, and the dryness and the degree of superheat of steam are monitored in real time through the dryness and humidity sensor in the transfer closed box; and the Y-shaped mechanical filter assembly realizes impurity filtration and mechanical rotation of the steam during conveying and starts a standby impurity filter plate, so that the device can eliminate temperature stratification and output high-purity steam.

Description

Technical Field

[0001] This application relates to the field of steam control technology, and in particular to a PLC-based steam metering and control device. Background Technology

[0002] PLC control technology has important applications in steam metering and control. A PLC is a digital computing electronic system designed specifically for industrial environments. It performs logical operations, sequential control, timing, counting, and arithmetic operations through a programmable memory, and controls mechanical and electrical equipment by reading sensor data and running programs.

[0003] A search revealed that CN215892312U discloses a steam consumption reduction control device based on precise metering. Pulling a pull plate away from the sensor moves a connecting rod and clamping block closer to the pull plate, increasing the distance between the two clamping blocks until the protective pad detaches from the sensor surface. At this point, the spring is in an elastic contraction state. Under the spring force, the connecting rod and clamping block move closer to the sensor until the protective pad is firmly attached to the sensor surface, enabling sensor replacement. Cold water enters the condenser tube and exits through the inlet and outlet. The high-temperature steam in the exhaust pipe is cooled and liquefied as it passes through the condenser tube, condensing into water droplets that flow into the water tank for storage, thus achieving cold recovery.

[0004] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist that need to be improved: the above-mentioned devices only add the function of condensate recovery, but do not add relevant components to regulate the flow rate, temperature, and pressure of the input steam, or maintain the dryness or superheat of the steam in the tank, so that the concentration of steam cannot be effectively controlled. Furthermore, when the traditional devices output steam, they cannot perform synchronous impurity management on the steam during the transportation process, thus failing to ensure the purity of the steam. Utility Model Content

[0005] This application provides a PLC-based steam metering and control device to improve the following technical problems: the above-mentioned device only adds the function of condensate recovery, but does not add relevant components to adjust the flow rate, temperature and pressure of the input steam, and maintain the dryness or superheat of the steam in the tank, so the concentration of steam cannot be effectively controlled. In addition, when the traditional device outputs steam, it cannot perform synchronous impurity management on the steam during the transportation process, thus failing to ensure the purity of the steam.

[0006] This application provides a PLC-based steam metering and control device, which adopts the following technical solution:

[0007] The PLC-based steam metering and control device includes a steam tank, a steam pipeline, a vortex flow meter, a pressure transmitter, a transfer sealed box, a concentration control component, and a Y-type mechanical filter component. The steam pipeline is welded to one side of the steam tank, the vortex flow meter is snapped onto the outside of the steam pipeline, the pressure transmitter is snapped onto the outside of the steam pipeline near the vortex flow meter, the inner surface of the transfer sealed box is tightly fitted to the other side of the steam pipeline, the concentration control component is installed on the outside of the transfer sealed box, and the Y-type mechanical filter component is installed on the inside of the steam tank.

[0008] The steam tank is used for steam storage, the steam pipeline is used for transporting steam and connecting to the intermediate sealed box, the vortex flow meter is used for measuring steam flow and outputting pulse signals to the PLC, the pressure transmitter is used for monitoring the pressure of the steam pipeline and calculating saturation temperature and density compensation, the intermediate sealed box is used for temporarily introducing steam and detecting the dryness and superheat of the internal steam, the concentration control component is used to increase the superheat of the steam and prevent water accumulation at the bottom of the steam tank, and the Y-type mechanical filter component is used to filter solid impurities in the steam.

[0009] In one feasible technical solution of this application, the Y-type mechanical filtration assembly includes a protective box, a small motor, a drive shaft, a guide shaft, a socket plate, a circular frame, and an impurity filter plate. The small motor is installed inside the protective box. The bottom of the drive shaft is fixedly connected to the motor shaft of the small motor via a coupling. The guide shaft passes through one side of the protective box and fits tightly against the middle of the socket plate. The circular frame is installed on the outside of the socket plate, and the impurity filter plate is inserted into the inside of the circular frame.

[0010] In one feasible technical solution of this application, the concentration control component includes a DC motor, a corrosion-resistant shaft, an outer expansion frame, and an electric heating tube. The DC motor is installed on the top of the steam tank, the corrosion-resistant shaft is fixedly connected below the output end of the DC motor, the outer expansion frame is sleeved on the outside of the corrosion-resistant shaft, and the electric heating tube is installed on the inside of the outer expansion frame and is used for rotating and heating the steam.

[0011] In one feasible technical solution of this application, the outer side of the circular frame is further provided with a bracket with a slot, a back bend, and a steam inlet pipe. The surface of the bracket with the slot is in close contact with the surface of the circular frame. The back bend pipe penetrates the interior of the protective box and is in close contact with the inner surface of the steam tank. The back bend pipe is used to reintroduce steam with insufficient dryness into the steam tank. The steam inlet pipe is clamped to the bottom of one side of the back bend pipe and is used to output steam with sufficient dryness.

[0012] In one feasible technical solution of this application, a sealing gasket is also provided on the outside of the circular frame located on the impurity filter plate.

[0013] In one feasible technical solution of this application, a PLC control box for connecting the vortex flow meter and the signal terminal of the pressure transmitter is also provided on the outside of the transfer sealed box.

[0014] In one feasible technical solution of this application, an air pump is installed on the outside of both the steam pipe and the back bend.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] This device uses a concentration control component to drive the electric heating tube to rotate and heat the steam, thereby uniformly increasing the superheat and avoiding localized overheating. In conjunction with a humidity sensor in the transfer sealed box, it monitors the dryness and superheat of the steam in real time. A small motor drives the impurity filter plate of the Y-type mechanical filtration component to rotate, realizing the filtration of impurities in the steam under the conveying device, as well as mechanical rotation and activation of the standby impurity filter plate. The PLC control box centrally processes the signals from the vortex flow meter and pressure transmitter, and displays the flow rate, pressure, temperature, and dryness curves in real time, enabling this device to eliminate temperature stratification and output high-purity steam. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a PLC-based steam metering and control device according to an embodiment of this application.

[0019] Figure 2 This is a structural schematic diagram of the cross-section of the protective box in an embodiment of this application.

[0020] Figure 3 This is a distribution diagram of the card slot bracket and humidity sensor in the embodiments of this application.

[0021] Figure 4 This is a schematic diagram of the concentration control component in the embodiments of this application.

[0022] Figure 5 yes Figure 4 Enlarged view of part 1.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Steam tank; 2. Steam pipeline; 3. Vortex flow meter; 4. Pressure transmitter; 5. Transfer sealed box;

[0025] 6. Concentration control components; 61. DC motor; 62. Corrosion-resistant shaft; 63. External expansion frame; 64. Electric heating element;

[0026] 7. Y-type mechanical filter assembly; 71. Protective housing; 72. Small motor; 73. Drive shaft; 74. Guide shaft; 75. Connecting plate; 76. Circular frame; 77. Impurity filter plate;

[0027] 8. Bracket with slot; 9. Back bend pipe; 10. Steam inlet pipe; 11. Sealing gasket; 12. PLC control box; 13. Air pump; 14. Humidity sensor; 15. Gear with different surfaces. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a PLC-based steam metering and control device. (See also...) Figures 1 to 5 The PLC-based steam metering and control device includes a steam tank 1, a steam pipeline 2, a vortex flow meter 3, a pressure transmitter 4, a transfer sealed box 5, a concentration control component 6, and a Y-type mechanical filter component 7. The steam pipeline 2 is welded to one side of the steam tank 1, the vortex flow meter 3 is snapped onto the outside of the steam pipeline 2, the pressure transmitter 4 is snapped onto the outside of the steam pipeline 2 near the vortex flow meter 3, the inner surface of the transfer sealed box 5 is tightly fitted to the other side of the steam pipeline 2, the concentration control component 6 is installed on the outside of the transfer sealed box 5, and the Y-type mechanical filter component 7 is installed on the inside of the steam tank 1.

[0032] Steam tank 1 is used for steam storage, steam pipeline 2 is used for transporting steam and connecting to intermediate sealed box 5, vortex flow meter 3 is used for measuring steam flow and outputting pulse signals to PLC, pressure transmitter 4 is used for monitoring the pressure of steam pipeline 2 and calculating saturation temperature and density compensation, intermediate sealed box 5 is used for temporarily introducing steam and detecting the dryness and superheat of the internal steam, concentration control component 6 is used to increase the superheat of steam and prevent water accumulation at the bottom of steam tank 1, and Y-type mechanical filter component 7 is used to filter solid impurities in steam.

[0033] The Y-type mechanical filter assembly 7 includes a protective box 71, a small motor 72, a drive shaft 73, a guide shaft 74, a socket 75, a circular frame 76, and an impurity filter plate 77. The small motor 72 is installed inside the protective box 71. The bottom of the drive shaft 73 is fixedly connected to the motor shaft of the small motor 72 via a coupling. The guide shaft 74 passes through one side of the protective box 71 and fits tightly against the middle of the socket 75. The circular frame 76 is installed on the outside of the socket 75, and the impurity filter plate 77 is inserted into the inside of the circular frame 76.

[0034] The concentration control assembly 6 includes a DC motor 61, a corrosion-resistant shaft 62, an outer expansion frame 63, and an electric heating tube 64. The DC motor 61 is installed on the top of the steam tank 1. The corrosion-resistant shaft 62 is fixedly connected below the output end of the DC motor 61. The outer expansion frame 63 is sleeved on the outside of the corrosion-resistant shaft 62. The electric heating tube 64 is installed on the inside of the outer expansion frame 63 and is used to rotate and heat the steam.

[0035] The outer side of the circular frame 76 is also provided with a bracket with a slot, a back bend 9 and a steam pipe 10. The surface of the bracket with a slot is in close contact with the surface of the circular frame 76. The back bend 9 penetrates the interior of the protective box 71 and is in close contact with the inner surface of the steam tank 1. The back bend 9 is used to reintroduce steam that does not meet the dryness standard into the steam tank 1. The steam pipe 10 is snapped into the bottom of one side of the back bend 9 and is used to output steam that meets the dryness standard.

[0036] A sealing gasket 11 is also provided on the outside of the circular frame 76 located on the impurity filter plate 77.

[0037] The outside of the transfer sealed box 5 is also equipped with a PLC control box 12 for connecting the signal terminals of the vortex flow meter 3 and the pressure transmitter 4.

[0038] A vacuum pump 13 is installed on the outside of both the steam pipe 2 and the back bend 9.

[0039] The general usage process of the PLC-based steam metering and control device in this application embodiment is as follows:

[0040] Steam inside the steam tank 1 flows through the welded interface steam pipe 2. The vacuum pump 13 is activated to maintain and stabilize the steam flow rate within the pipe. During concentration control, steam enters the intermediate sealed box 5 through the steam pipe 2. Inside the intermediate sealed box 5, three humidity sensors 14 are arranged at equal intervals along the vertical direction. The top sensor monitors the initial steam dryness, the middle sensor monitors heating uniformity, and the bottom sensor monitors the risk of condensate accumulation. The humidity sensors 14 are fixed to the inner wall of the intermediate sealed box 5 via stainless steel threaded interfaces. Signal cables are led out through conduits and connected to the PLC control box 12. If the temperature is insufficient, the PLC control box 12 activates the vacuum pump 13 on the back bend pipe 9 to pump the steam back into the steam tank 1 for recirculation. Then, the concentration control component 6 is activated. The DC motor 61 drives the corrosion-resistant shaft 62 to rotate, causing the electric heating tube 64 on the outer frame 63 to uniformly heat the steam. The PLC calculates the saturation temperature based on data from the pressure transmitter 4. If the measured temperature is too high, the heating power is reduced to maintain the target value. The qualified steam is output through the steam pipe 10 fixed by the slotted bracket 8, and the vortex flow meter 3 synchronously measures the output flow. When filtering steam impurities, the small motor 72 in the protective box 71 can be started to drive the top drive shaft 73 to rotate. The shaft end of the drive shaft 73 is equipped with a non-planar gear 15, and the driven non-planar gear 15 is fitted on the outside of the guide shaft 74. The non-planar gears mesh at 90°. With the cooperation of the non-planar gear 15, the horizontal rotation of the small motor 72 is converted into the vertical rotation of the guide shaft 74, so that the guide shaft 74 can drive the sleeve plate 75 and the circular frame 76 to rotate inside the protective box 71, thereby re-blocking the new impurity filter plate 77 inside the connection of the slotted bracket 8 located in the back bend pipe 9, ensuring the real-time effectiveness of filtration. The sealing gasket 11 ensures no steam leakage.

[0041] The beneficial technical effects of the PLC-based steam metering and control device in this application are roughly as follows:

[0042] This device uses a concentration control component 6 to drive an electric heating tube 64 to rotate and heat the steam, thereby uniformly increasing the superheat and avoiding local overheating. It works in conjunction with a humidity sensor 14 in a sealed transfer box 5 to monitor the dryness and superheat of the steam in real time. A small motor 72 drives a Y-type mechanical filter component 7 to rotate an impurity filter plate 77, enabling impurity filtration of the steam in the conveying device and activating the standby impurity filter plate 77. A PLC control box 12 centrally processes signals from a vortex flow meter 3 and a pressure transmitter 4, displaying flow, pressure, temperature, and dryness curves in real time, enabling the device to eliminate temperature stratification and output high-purity steam.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A PLC-based steam metering and control device, characterized in that, The steam tank (1), steam pipe (2), vortex flow meter (3), pressure transmitter (4), transfer sealed box (5), concentration control component (6) and Y-type mechanical filter component (7) are included. The steam pipe (2) is welded to one side of the steam tank (1). The vortex flow meter (3) is snapped onto the outside of the steam pipe (2). The pressure transmitter (4) is snapped onto the outside of the steam pipe (2) near the vortex flow meter (3). The inner surface of the transfer sealed box (5) is tightly fitted to the other side of the steam pipe (2). The concentration control component (6) is installed on the outside of the transfer sealed box (5). The Y-type mechanical filter component (7) is installed on the inside of the steam tank (1). The steam tank (1) is used for steam storage, the steam pipeline (2) is used for transporting steam and connecting to the transfer sealed box (5), the vortex flow meter (3) is used for measuring steam flow and outputting pulse signals to the PLC, the pressure transmitter (4) is used for monitoring the pressure of the steam pipeline (2) and calculating saturation temperature and density compensation, the transfer sealed box (5) is used for temporarily introducing steam and detecting the dryness and superheat of the internal steam, the concentration control component (6) is used to increase the superheat of the steam and prevent water accumulation at the bottom of the steam tank (1), and the Y-type mechanical filter component (7) is used to filter solid impurities in the steam.

2. The PLC-based steam metering and control device according to claim 1, characterized in that, The Y-type mechanical filter assembly (7) includes a protective box (71), a small motor (72), a drive shaft (73), a guide shaft (74), a socket (75), a circular frame (76), and an impurity filter plate (77). The small motor (72) is installed inside the protective box (71). The bottom of the drive shaft (73) is fixedly connected to the motor shaft of the small motor (72) through a coupling. The guide shaft (74) passes through one side of the protective box (71) and fits tightly against the middle of the socket (75). The circular frame (76) is installed on the outside of the socket (75). The impurity filter plate (77) is inserted into the inside of the circular frame (76).

3. The PLC-based steam metering and control device according to claim 1, characterized in that, The concentration control component (6) includes a DC motor (61), a corrosion-resistant shaft (62), an outer expansion frame (63), and an electric heating tube (64). The DC motor (61) is installed on the top of the steam tank (1). The corrosion-resistant shaft (62) is fixedly connected below the output end of the DC motor (61). The outer expansion frame (63) is sleeved on the outside of the corrosion-resistant shaft (62). The electric heating tube (64) is installed on the inside of the outer expansion frame (63) and is used to rotate and heat the steam.

4. The PLC-based steam metering and control device according to claim 2, characterized in that, The outer side of the circular frame (76) is also provided with a slotted bracket (8), a back bend (9) and a steam pipe (10). The surface of the slotted bracket (8) is closely attached to the surface of the circular frame (76). The back bend (9) penetrates the interior of the protective box (71) and is closely attached to the inner surface of the steam tank (1). The back bend (9) is used to re-enter the steam tank (1) if the dryness does not meet the standard. The steam pipe (10) is clamped to the bottom of one side of the back bend (9) and is used to output steam with the dryness meets the standard.

5. The PLC-based steam metering and control device according to claim 4, characterized in that, The circular frame (76) is located on the outside of the impurity filter plate (77) and is also provided with a sealing gasket (11).

6. The PLC-based steam metering and control device according to claim 1, characterized in that, The outside of the transfer sealed box (5) is also provided with a PLC control box (12) for connecting the signal terminals of the vortex flow meter (3) and the pressure transmitter (4).

7. The PLC-based steam metering and control device according to claim 4, characterized in that, Both the steam pipe (2) and the back bend (9) are equipped with air pumps (13).

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