Air temperature and humidity sensor

Abstract

An air temperature and humidity sensor comprises an instrument display, a measuring insertion rod, a probe assembly and an outer sleeve, the measuring insertion rod is used for being inserted into the outer sleeve and fixed to the outer sleeve, a gap is formed between the measuring insertion rod and the outer sleeve, and the gap is communicated with a soot blowing system; and a dust scraping piece is rotatably mounted at the end part of the outer sleeve, is driven by wind power of the dust blowing system to rotate, and is used for cleaning dust outside the probe assembly. By optimizing the design of the ash scraping piece and the ash blowing system, the ash removal effect and the measurement accuracy of the temperature and humidity sensor are remarkably improved, the service life of the sensor is prolonged, and the temperature and humidity sensor is suitable for various occasions needing accurate temperature and humidity measurement.

Description

Technical Field

[0001] This utility model belongs to the field of temperature and humidity monitoring devices, and specifically relates to an air temperature and humidity sensor. Background Technology

[0002] For power plants (both hydropower and thermal power plants), the temperature and humidity of air ducts or flues (thermal power plants have flues in their main process areas, while hydropower plants do not, but areas such as staff canteens do) are frequently monitored indicators. Traditional temperature and humidity sensors installed on ducts (such as the temperature and humidity sensor for flue gas monitoring disclosed in CN219368813U) generally include an instrument display, a measuring probe, a probe assembly, and an outer sleeve. For temperature and humidity sensors with higher measurement accuracy, a back-blowing system is also added to clean the dust accumulated on the probe assembly. However, the back-blowing system mainly relies on wind power to blow away the dust, which is not ideal. Therefore, in order to further reduce the impact of dust on measurement accuracy, it is necessary to design a temperature and humidity sensor with better dust removal performance. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an air temperature and humidity sensor. By optimizing the design of the dust scraper and the dust blowing system, this utility model significantly improves the dust removal effect and measurement accuracy of the temperature and humidity sensor, extends the service life of the sensor, and is suitable for various occasions that require accurate temperature and humidity measurement.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An air temperature and humidity sensor includes an instrument display, a measuring rod, a probe assembly, and an outer tube. The measuring rod is inserted into and fixed to the outer tube. A gap is provided between the measuring rod and the outer tube, and the gap is connected to a dust blowing system. A dust scraper is rotatably mounted at the end of the outer tube. The dust scraper is driven to rotate by the airflow of the dust blowing system and is used to clean dust from the outside of the probe assembly.

[0006] Preferably, the outer sleeve and the measuring probe are connected by a flange, which includes a first flange and a second flange. The first flange is connected to the measuring probe, and the second flange is connected to the outer sleeve.

[0007] The soot blowing system includes an air inlet pipe connected to the first flange, one end of which is connected to the gap between the measuring probe and the outer sleeve, and the other end of which is connected to an air source.

[0008] Preferably, the soot blowing system also includes an electromagnetic switch valve, which is intermittently switched on and off by a timer relay, and is used to control the ventilation time of the air inlet duct.

[0009] Preferably, the scraper includes a scraper blade, which is mounted on a slip ring. The slip ring is connected to the inner wall of the outer sleeve via a bearing, and the scraper blade has a curved structure.

[0010] Preferably, the scraper blade is a soft scraper blade with a spiral structure.

[0011] Preferably, the number of scraper blades is two or more, and the multiple scraper blades are arranged in a ring around the axis of the measuring rod.

[0012] Preferably, a brush is installed on the scraper blade.

[0013] The present invention can achieve the following beneficial effects:

[0014] 1. The dust scraper is installed at the end of the outer sleeve and can be rotated by the airflow of the dust blowing system to effectively clean the dust on the outside of the probe assembly. The scraper blades on the dust scraper are soft blades with a spiral structure, which increases the contact area and the dust removal effect. Multiple scraper blades are arranged in a ring around the axis of the measuring rod to achieve all-round dust removal and ensure the cleanliness of the probe assembly surface.

[0015] 2. The scraper is mounted on a slip ring, which is connected to the inner wall of the outer sleeve via a bearing, ensuring smooth rotation of the scraper and reducing friction and wear.

[0016] 3. Installing a brush on the scraper blade further improves the dust removal ability, especially for removing fine dust and adhering substances.

[0017] 4. The spiral structure of the scraper blade forms a fan-shaped structure, which can more effectively drive the entire scraper to rotate under the wind force of the soot blowing system, thus enhancing the cleaning effect.

[0018] 5. The soot blowing system is controlled by electromagnetic switching valves and timer relays to achieve periodic operation. For example, it can be set to start once every seven days, with each start lasting 2 minutes. This not only improves the soot blowing capability but also reduces wear on the scraper components and the ventilated protective shell. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention. Figure 1 ;

[0021] Figure 2 This is a three-dimensional structural diagram of the present invention. Figure 2 ;

[0022] Figure 3 This is a schematic diagram showing the connection between the first flange and the measuring rod of this utility model;

[0023] Figure 4 This is a schematic diagram of the brush installation of this utility model;

[0024] Figure 5 This is the electrical control schematic diagram of this utility model.

[0025] In the diagram: 1. Instrument display; 2. Measuring probe; 3. Ventilation protective shell; 4. Outer sleeve; 5. Scraper; 501. Scraper blade; 502. Slip ring; 601. First flange; 602. Second flange; 7. Air inlet pipe; 8. Brush. Detailed Implementation

[0026] Preferred solutions include Figures 1 to 5 As shown, an air temperature and humidity sensor includes an instrument display 1, a measuring rod 2, a probe assembly, and an outer tube 4. The measuring rod 2 is inserted into and fixed to the outer tube 4. A gap is provided between the measuring rod 2 and the outer tube 4, and the gap is connected to a dust blowing system. A dust scraper 5 is rotatably mounted at the end of the outer tube 4. The dust scraper 5 is driven to rotate by the air force of the dust blowing system and is used to clean the dust outside the probe assembly.

[0027] The instrument display 1, which displays measurement results, is an electronic component. The measuring probe 2 is inserted into and secured within the outer sleeve 4. The probe assembly measures temperature and humidity, and typically has a breathable protective shell 3. The outer sleeve 4 serves to protect the probe and provide an installation channel.

[0028] This invention adds a dust scraper 5 to the existing technology. This scraper is mounted on the end of the outer sleeve 4 and is rotatable. The dust scraper 5 is driven to rotate by the airflow of the dust blowing system and is used to clean dust from the probe assembly 3. The dust scraper 5 is mounted on a slip ring 502, which is connected to the inner wall of the outer sleeve 4 via a bearing. The dust scraper blade 501 has a curved structure, preferably a spiral structure made of soft material, to increase the contact area and cleaning effect. There are two or more dust scraper blades 501, arranged in a ring around the axis of the measuring rod 2 to achieve omnidirectional dust cleaning.

[0029] At the location of slip ring 502, an annular groove is provided on the inner wall of outer sleeve 4, which is used to install bearings.

[0030] As a preferred option, the dust scraper 501 is a soft scraper with a spiral structure, such as a rubber sheet. The rubber sheet can be attached to the outside of the breathable protective shell 3. When the dust scraper 501 is rotated by the wind, it will scrape away the dust on the breathable protective shell 3.

[0031] To further improve the dust removal capability of the scraper blade 501, a brush can be installed on the scraper blade 501. The brush provides a better dust removal effect. The spiral structure of the scraper blade 501 forms a fan-shaped structure, which, under the action of the airflow from the dust blowing system, drives the entire scraper component 5 to rotate.

[0032] Furthermore, the outer sleeve 4 is connected to the measuring probe 2 via a flange, which includes a first flange 601 and a second flange 602. The first flange 601 is connected to the measuring probe 2, and the second flange 602 is connected to the outer sleeve 4.

[0033] The soot blowing system includes an air inlet pipe 7 connected to the first flange 601. One end of the air inlet pipe 7 is connected to the gap between the measuring rod 2 and the outer sleeve 4, and the other end of the air inlet pipe 7 is connected to the air source.

[0034] The soot blowing system does not continuously supply airflow to the temperature and humidity sensors, as this would accelerate the wear of the scraper component 5 and the ventilated protective shell 3. Instead, it operates periodically at set time intervals. Specifically, the soot blowing system also includes an electromagnetic switch valve, which is intermittently switched on and off via a timer relay. The electromagnetic switch valve controls the ventilation time of the air inlet duct 7. For example, if the timer relay is set to open once every seven days for two minutes each time, then the soot blowing system and scraper component 5 will run for two minutes every week. This achieves both improved cleaning efficiency and reduced wear on components. The electrical control principle is as follows: Figure 5 As shown: When time relay KT is energized, its normally open contact closes, energizing solenoid valve KM1, connecting the air supply to the soot blowing system, and allowing air to flow through inlet pipe 7. To manually start the soot blowing system, press switch SB1. To manually disconnect the soot blowing system, press switch SB2. The entire control unit is controlled by a PLC controller.

[0035] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. An air temperature and humidity sensor, comprising an instrument display (1), a measuring rod (2), a probe assembly, and an outer tube (4), wherein the measuring rod (2) is inserted into and fixed to the outer tube (4), characterized in that: A gap is provided between the measuring probe (2) and the outer tube (4), and the gap is connected to the dust blowing system; a dust scraper (5) is rotatably installed at the end of the outer tube (4), and the dust scraper (5) is driven to rotate by the wind of the dust blowing system and is used to clean the dust outside the probe assembly.

2. An air temperature and humidity sensor according to claim 1, characterized in that: The outer sleeve (4) is connected to the measuring rod (2) by a flange, which includes a first flange (601) and a second flange (602). The first flange (601) is connected to the measuring rod (2), and the second flange (602) is connected to the outer sleeve (4). The soot blowing system includes an air inlet pipe (7) connected to the first flange (601), one end of the air inlet pipe (7) is connected to the gap between the measuring rod (2) and the outer sleeve (4), and the other end of the air inlet pipe (7) is connected to the air source.

3. An air temperature and humidity sensor according to claim 2, characterized in that: The soot blowing system also includes an electromagnetic switch valve, which is controlled by a timer relay to switch on and off intermittently. The electromagnetic switch valve is used to control the ventilation time of the air inlet pipe (7).

4. An air temperature and humidity sensor according to claim 1, characterized in that: The scraper (5) includes a scraper blade (501), which is mounted on a slip ring (502). The slip ring (502) is connected to the inner wall of the outer sleeve (4) through a bearing. The scraper blade (501) has a curved structure.

5. An air temperature and humidity sensor according to claim 4, characterized in that: The scraper blade (501) is a soft scraper blade with a spiral structure.

6. An air temperature and humidity sensor according to claim 4, characterized in that: The number of scraper blades (501) is two or more, and multiple scraper blades (501) are arranged in a ring around the axis of the measuring rod (2).

7. An air temperature and humidity sensor according to claim 5 or 6, characterized in that: A brush (8) is installed on the scraper blade (501).

Images