Filter unit monitoring device of valve hall air handling unit

Abstract

The invention belongs to the technical field of converter stations, and particularly relates to a valve hall air handling unit filter unit monitoring device, monitoring instrument and monitoring probe, the monitoring probe comprises a pitot tube, the pitot tube comprises an end round head and a double-layer sleeve, and a total pressure hole is formed in the midline point of the end round head; a plurality of static pressure holes are formed in the end of an outer sleeve of the double-layer sleeve and distributed in a circumferential array mode. The monitoring instrument comprises an instrument body, a positive pressure port and a negative pressure port, the positive pressure port and the negative pressure port are formed in the instrument body, the end of an inner sleeve of the double-layer sleeve is connected with a first pipeline, the first pipeline is connected with the positive pressure port, and the other end of an outer sleeve of the double-layer sleeve is communicated with the negative pressure port through a second connecting pipe; the monitoring instrument is matched with the monitoring probe to detect gas pressure and gas flow velocity parameters in the pipeline to be detected, and is matched with the roughness monitor and the air particle monitoring device to jointly control the opening and closing degree of the air inlet valve and the air return valve so as to carry out real-time early warning. Safety operation of equipment is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of converter station technology, specifically relating to a monitoring device for the filter unit of a valve hall air handling unit. Background Technology

[0002] A converter station is a facility used in high-voltage direct current transmission systems to convert alternating current (AC) into direct current (DC) or vice versa. Such facilities typically consist of various equipment, among which the main converter equipment is the converter valve. During operation, the converter valve requires an auxiliary system to cool it, and the valve hall air conditioning system plays a crucial role in this auxiliary system.

[0003] In a valve hall air conditioning system, it is necessary to maintain a slightly positive pressure in the valve hall and supply air to the valve hall. During the air supply process, the air handling unit of the valve hall needs to filter the gas used for gas exchange in the valve hall to prevent dust from being carried in the gas and causing dust to adhere to the converter valve. Dust adhering to the converter valve can easily cause short circuits in the converter valve, thereby affecting the operation of the DC system.

[0004] However, traditional converter station valve hall air handling unit filter units lack effective monitoring mechanisms, making it impossible to monitor the valve hall's air handling units in real time. The lack of monitoring mechanisms for the valve hall air handling unit filter units, coupled with the absence of direct alarms indicating filter blockage in the backend system, further exacerbates the problem. The Mujia converter station is located in an area with relatively poor air quality, experiencing stubble burning every spring and autumn. Failure to replace filter units in a timely manner can lead to severe clogging, even before the replacement cycle is reached. This significantly impacts the cooling effect of the valve hall, and the loss of slight positive pressure increases the likelihood of dust entering the valve hall. Once a large amount of dust enters the valve hall, it adheres to the valve body surface, greatly increasing the possibility of flashing and causing serious consequences. In summer, when air quality is good, filter units may be in good condition even before their replacement cycle is reached, resulting in wasted filter units.

[0005] Therefore, this invention proposes a monitoring device for the filter unit of a valve hall air handling unit. Summary of the Invention

[0006] The purpose of this invention is to provide a monitoring device for the filter unit of an air handling unit in a valve hall. This device aims to address the lack of an effective detection mechanism for the filter unit of the air handling unit in the valve hall of a converter station, which prevents real-time monitoring of filter blockage. Failure to replace the filter unit in a timely manner can lead to severe blockage before the replacement cycle is reached. This significantly impacts the cooling effect of the valve hall and causes it to lose its slight positive pressure, increasing the likelihood of dust entering the valve hall. Once a large amount of dust enters the valve hall, it will adhere to the valve body surface, greatly increasing the possibility of flashover and causing serious consequences, posing a significant safety hazard to the operating equipment.

[0007] The specific technical solution adopted by this invention is as follows: A monitoring device for the filter unit of a valve hall air handling unit includes a monitoring instrument and a monitoring probe. The monitoring probe includes a Pitot tube, which includes an end round head and a double-layer sleeve. A total pressure hole is opened at the center point of the end round head, and a plurality of static pressure holes are opened at the end of the outer sleeve of the double-layer sleeve. The plurality of static pressure holes are distributed in a circumferential array. The monitoring instrument includes an instrument body, with a positive pressure port and a negative pressure port at the upper end of the instrument body. The inner sleeve of the double-layered sleeve is connected to a first pipe, which is connected to the positive pressure port. The outer sleeve of the double-layered sleeve is connected to a pipe connector at the other end. The outlet end of the pipe connector is connected to the interlayer of the double-layered sleeve. The outlet end of the pipe connector is connected to a second connecting pipe, which is connected to the negative pressure port. The monitoring instrument, in conjunction with the monitoring probe, detects the gas pressure and gas flow rate parameters inside the tested pipeline. Together with the roughness monitor and the air particle monitoring device, they control the opening and closing degree of the air inlet valve and the air return valve, and provide real-time early warning by setting alarm thresholds.

[0008] Preferably, the diameter of the outer sleeve of the double-layer sleeve is D, the diameter of the total pressure hole is 0.3-0.6D, the distance between the static pressure hole and the total pressure hole is 3-8D, and the static pressure hole is perpendicular to the outer wall of the outer sleeve of the double-layer sleeve.

[0009] Preferably, the instrument body is equipped with a display screen, which is used to display gas pressure, flow rate, and velocity.

[0010] Preferably, the instrument body displays the sampling time and alarm threshold, and the USB interface on the instrument body connects to a computer via a data cable, enabling users to query historical records, perform data statistics and parameter settings, and create density tables.

[0011] Preferably, the instrument body generates a gradient table for the detected air pressure difference and flow rate, and sets corresponding levels according to the gradient table to control the opening and closing degree of the air inlet valve and the air return valve. When the air pressure difference or flow rate is small, the air inlet valve is reduced and the air return valve is increased, that is, the external circulation is reduced and the internal circulation is enhanced. At the same time, according to the alarm threshold set by the gradient table, when the alarm threshold is reached, an alarm is sent to the operator's workstation to remind the staff to replace the filter unit.

[0012] Preferably, the outer sleeve of the double-layered sleeve has a through hole at the other end, the pipe connector is fitted into the through hole, the pipe connector is sealed to the outer wall of the outer sleeve of the double-layered sleeve, and the outlet end of the pipe connector is aligned with the through hole.

[0013] The technical effects achieved by this invention are as follows: In this invention, the Pitot tube is connected to the main body of the instrument, which can monitor the clogging of the filter unit in real time. The degree of clogging of the air conditioning filter is reflected by monitoring the air pressure and flow rate, ensuring the slight positive pressure and temperature in the valve hall. At the same time, during the operation of the system, the slight positive pressure and temperature in the valve hall are monitored in real time to find the limit value of the filter unit, thereby realizing the real-time monitoring of the clogging of the filter unit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a monitoring device for the filter unit of a valve hall air handling unit according to the present invention; Figure 2 This is a front cross-sectional schematic diagram of a monitoring device for the filter unit of a valve hall air handling unit according to the present invention; Figure 3 This is the present invention. Figure 2 Enlarged view of point A in the middle; Figure 4 This is the present invention. Figure 2 Enlarged view of point B in the middle.

[0015] The attached diagram lists the components represented by each number as follows: 1. Pitot tube; 2. Instrument body; 101. End round head; 102. Double-layer sleeve; 103. Total pressure hole; 104. Static pressure hole; 105. First pipe; 106. Pipe connector; 107. Second connecting pipe; 201. Positive pressure port; 202. Negative pressure port. Detailed Implementation

[0016] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0017] like Figures 1-4 As shown, a monitoring device for the filter unit of a valve hall air handling unit includes a monitoring instrument and a monitoring probe. The monitoring probe includes a Pitot tube 1, which includes an end round head 101 and a double-layer sleeve 102. A total pressure hole 103 is opened at the center point of the end round head 101. A plurality of static pressure holes 104 are opened at the end of the outer sleeve of the double-layer sleeve 102. The plurality of static pressure holes 104 are distributed in a circumferential array. The monitoring instrument includes an instrument body 2. The upper end of the instrument body 2 is provided with a positive pressure port 201 and a negative pressure port 202. A first pipe 105 is connected to the end of the inner sleeve of the double-layered sleeve 102, and the first pipe 105 is connected to the positive pressure port 201. A pipe connector 106 is connected to the other end of the outer sleeve of the double-layered sleeve 102. A through hole is opened at the other end of the outer sleeve of the double-layered sleeve 102, and the pipe connector 106 is fitted into the through hole, sealing against the outer wall of the outer sleeve of the double-layered sleeve 102. The outlet end of the pipe connector 106 is aligned with the through hole, and the outlet end of the pipe connector 106 is connected to the interlayer of the double-layer sleeve 102. The outlet end of the pipe connector 106 is connected to a second connecting pipe 107, which is connected to the negative pressure port 202. The diameter of the outer sleeve of the double-layer sleeve 102 is D, the diameter of the total pressure hole 103 is 0.3-0.6D, the distance between the static pressure hole 104 and the total pressure hole 103 is 3-8D, and the static pressure hole 104 is perpendicular to the outer wall of the outer sleeve of the double-layer sleeve 102. like Figures 1-4 As shown, in practical use, the Pitot tube 1 is placed in a steady airflow where the velocity to be measured is to be aligned with the direction of the airflow, with the rounded end 101 of the tube's leading edge facing the incoming flow. When the airflow approaches point O of the total pressure orifice 103 at the rounded end 101, its velocity gradually decreases until it reaches zero at point O of the total pressure orifice 103. Therefore, the total pressure Pφ is measured at point O of the total pressure orifice 103. Secondly, since the Pitot tube 1 is very thin, point C of the static pressure orifice 104 is sufficiently far from point O of the total pressure orifice 103. Therefore, the velocity and pressure at point C have essentially recovered to values ​​equal to the incoming flow velocity V∞ and pressure P∞. Thus, the static pressure is measured at point C of the static pressure orifice 104. like Figures 1-4 As shown, the total pressure port 103 of the Pitot tube 1 is connected to the positive pressure port 201 of the instrument body 2 via the first pipe 105, and the static pressure port 104 of the Pitot tube 1 is connected to the negative pressure port 202 of the instrument body 2 via the second connecting pipe 107. The instrument body 2 is equipped with a display screen, which is used to display gas pressure, flow rate, and velocity. The specific structure of the instrument body 2 is common knowledge and will not be described in detail here. The monitoring instrument, in conjunction with the monitoring probe, detects the gas pressure and flow velocity parameters within the tested pipeline. Working in conjunction with the roughness monitor and air particle monitoring device, it controls the opening and closing of the inlet and return air valves. Real-time warnings are provided by setting alarm thresholds. The instrument body 2 displays the sampling time and alarm threshold settings. A USB interface on the instrument body 2 connects to a computer via a data cable, enabling users to query historical records, perform data statistics, set parameters, and create density tables. The instrument body 2 generates a gradient table based on the detected air pressure difference and flow velocity. Based on this gradient table, corresponding levels are set to control the opening and closing of the inlet and return air valves. When the air pressure difference or flow velocity is low, the inlet valve is reduced and the return air valve is increased, thus reducing external circulation and enhancing internal circulation. Simultaneously, based on the alarm thresholds set in the gradient table, an alarm is sent to the operator's workstation when the threshold is reached, reminding staff to replace the filter unit.

[0018] Specifically, when the air pressure difference of the air conditioning unit's filter unit decreases to an alarm value or the flow rate decreases to an alarm value, the maintenance personnel need to be prompted to replace the air conditioning unit's filter unit; when the relative rate of increase in the surface roughness of the filter unit reaches a set alarm threshold, the maintenance personnel need to be prompted to replace the air conditioning unit's filter unit; when the cleanliness of air particles near the air inlet valve is low and reaches an alarm threshold, the maintenance personnel need to be prompted to replace the air conditioning unit's filter unit.

[0019] The pressure and flow velocity parameters detected by the instrument body 2, in conjunction with the roughness monitor and air particle monitoring device, jointly control the opening and closing degree of the inlet and return air valves. The instrument can generate a gradient table for the detected air pressure difference and flow velocity, and generate corresponding levels based on the gradient table, thereby controlling the opening and closing degree of the inlet and return air valves. When the air pressure difference or flow velocity is small, the inlet air valve is reduced and the return air valve is increased, that is, the external circulation is reduced and the internal circulation is enhanced. At the same time, an alarm threshold is set according to the gradient table. When the alarm threshold is reached, an alarm is sent to the operator's workstation to remind the staff to replace the filter unit.

[0020] The surface roughness monitor is installed at the filter unit of the air handling unit in the valve hall. It can monitor and record the surface roughness of the filter unit in real time or at regular intervals through optical sensing. Under normal circumstances, the surface roughness of the filter unit in the valve hall air handling unit is low. When the filter unit becomes dirty or clogged, its surface roughness will increase. The roughness monitor can compare the data within its set sampling range and upload the sampled data to the operator's workstation in real time. When the relative rate of increase of the surface roughness of the filter unit is relatively fast, the inlet air valve is reduced and the return air valve is increased, that is, the external circulation is reduced and the internal circulation is enhanced. When the relative rate of increase of the surface roughness of the filter unit reaches the set alarm threshold, an alarm is sent to the operator's workstation to remind the staff to replace the filter unit.

[0021] The air particle monitoring device is installed near the air inlet valve and uses the principle of optical scattering. It can accurately monitor, calculate, and display the type, quantity, and concentration of particles in the air per unit volume near the air inlet valve in real time through multiple channels. It has a constant high-flow-rate gas sampling system. The sampling data can be uploaded to the operator's workstation in real time, and a corresponding air particle cleanliness gradient table is generated. Based on the gradient table, corresponding levels are set to control the opening and closing of the air inlet and return valves. When the air particle cleanliness level is low, the air inlet valve is closed and the return valve is opened, i.e., reducing external circulation and increasing internal circulation. At the same time, an alarm threshold is set according to the gradient table. When the alarm threshold is reached, an alarm is sent to the operator's workstation to remind the staff to replace the filter unit.

[0022] In this invention, the Pitot tube 1 is connected to the instrument body 2, which can monitor the clogging of the filter unit in real time. The degree of clogging of the air conditioning filter is reflected by monitoring the air pressure and flow rate, ensuring the slight positive pressure and temperature in the valve hall. At the same time, during the operation of the system, the slight positive pressure and temperature in the valve hall are monitored in real time to find the limit value of the filter unit, thereby realizing the real-time monitoring of the clogging of the filter unit.

[0023] In this invention, the addition of a roughness monitor and an air particle monitoring device enhances the system's functionality. The roughness monitor reflects the degree of dirt and clogging in the filter unit, while the air particle monitoring device reflects the cleanliness of air particles near the inlet valve. These components work in conjunction with the present invention to monitor the filter unit's dirt and clogging status, jointly controlling the opening and closing of the inlet and return air valves, effectively extending the filter unit's lifespan. The valve hall air conditioning pressure monitoring system can monitor the filter unit's clogging status in real time, ensuring operators have real-time knowledge of the filter unit's cleanliness and thus controlling its operation. This also avoids blind spots in filter unit monitoring, maximizing the protection of the valve hall's slight positive pressure and temperature, and improving system operational stability.

[0024] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A monitoring device for the filter unit of a valve hall air handling unit, characterized in that: The device includes a monitoring instrument and a monitoring probe. The monitoring probe includes a pitot tube (1). The pitot tube (1) includes an end round head (101) and a double-layer sleeve (102). A total pressure hole (103) is opened at the center point of the end round head (101). A plurality of static pressure holes (104) are opened at the end of the outer sleeve of the double-layer sleeve (102). The plurality of static pressure holes (104) are distributed in a circumferential array. The monitoring instrument includes an instrument body (2), the upper end of which is provided with a positive pressure port (201) and a negative pressure port (202). The inner sleeve end of the double-layer sleeve (102) is connected to a first pipe (105), the first pipe (105) is connected to the positive pressure port (201), the other end of the outer sleeve of the double-layer sleeve (102) is connected to a pipe connector (106), the outlet end of the pipe connector (106) is connected to the interlayer of the double-layer sleeve (102), and the outlet end of the pipe connector (106) is connected to a second connecting pipe (107), the second connecting pipe (107) is connected to the negative pressure port (202). The monitoring instrument, in conjunction with the monitoring probe, detects the gas pressure and gas flow rate parameters inside the tested pipeline. Together with the roughness monitor and the air particle monitoring device, they control the opening and closing degree of the air inlet valve and the air return valve, and provide real-time early warning by setting alarm thresholds.

2. The monitoring device for the filter unit of a valve hall air handling unit according to claim 1, characterized in that: The outer tube of the double-layer sleeve (102) has a diameter of D, the total pressure hole (103) has a diameter of 0.3-0.6D, the static pressure hole (104) is 3-8D away from the total pressure hole (103), and the static pressure hole (104) is perpendicular to the outer wall of the outer tube of the double-layer sleeve (102).

3. The monitoring device for the filter unit of a valve hall air handling unit according to claim 1, characterized in that: The instrument body (2) is equipped with a display screen, which is used to display gas pressure, flow rate and velocity.

4. The monitoring device for the filter unit of a valve hall air handling unit according to claim 3, characterized in that: The instrument body (2) displays the setting of sampling time and alarm threshold. The USB interface on the instrument body (2) is connected to a computer via a data cable.

5. A monitoring device for the filter unit of a valve hall air handling unit according to claim 4, characterized in that: The instrument body (2) forms a gradient table for the detected wind pressure difference and flow velocity, and forms corresponding gears according to the gradient table to control the opening and closing degree of the air inlet valve and the air return valve.

6. The monitoring device for the filter unit of a valve hall air handling unit according to claim 2, characterized in that: The outer sleeve of the double-layer sleeve (102) has a through hole at the other end. The pipe connector (106) is fitted into the through hole. The pipe connector (106) is sealed to the outer wall of the outer sleeve of the double-layer sleeve (102). The outlet end of the pipe connector (106) is aligned with the through hole.

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