CN216670302U

CN216670302U - Radiation protection device for ground air temperature measurement

Info

Publication number: CN216670302U
Application number: CN202122984927.1U
Authority: CN
Inventors: 王帅; 陈慧君
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-03
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a radiation protection device for ground temperature measurement, which comprises a reflector, a frame body, a reflector, a flow guide cover, a heat insulation column and a temperature sensor, wherein the frame body is connected with the reflector through the heat insulation column, the reflector and the flow guide cover are arranged in the frame body, the reflector is arranged on the periphery of the flow guide cover, the temperature sensor is arranged in the center of the frame body, the reflector comprises an upper reflector and a lower reflector, and the frame body is arranged between the upper reflector and the lower reflector. The device is internally transparent up and down, the upper surface and the lower surface of the device are provided with the reflecting plates, so that the direct solar radiation and ground reflection of the upper surface and the lower surface can be effectively blocked on the basis of ensuring the ventilation, and the radiation error caused by secondary radiation can be effectively reduced; the air guide sleeve enables the flowing direction of the passing gas to be in the streamline direction, the speed of the gas flow can be effectively accelerated, and the radiation error is further reduced.

Description

Radiation protection device for ground air temperature measurement

Technical Field

The utility model relates to a radiation protection device for measuring ground air temperature, belonging to the technical field of meteorological instruments.

Background

In the field of meteorological detection, direct solar radiation causes the temperature of a meteorological station temperature sensor to rise in the daytime, so that the observed value of the meteorological station temperature sensor is higher than the air temperature of the surrounding environment, and the meteorological station temperature sensor is called a radiation error. At present weather station is with shutter box or natural draft radiation shield can block some radiation to temperature sensor's direct irradiation, reduces the radiation error, however shutter box or radiation shield are difficult to 100% and block solar radiation, consequently to a certain extent, shutter box or radiation shield still can produce apparent radiation and heat up, lead to flowing into its inside air current by the heating, arouse that inside temperature sensor's observation result is higher than the temperature of outside free air. In addition, the vanes and ring plates can obstruct the airflow and the low internal airflow velocity can further increase the radiation error.

Based on the problems, the radiation error of the sensors in the louver box and the radiation shield can reach 1 ℃ or even higher. A good radiation protection design should not only be such that the radiation reaching the temperature sensor surface is as small as possible, but also such that the air flow velocity around the temperature sensor probe is as large as possible. The design of adopting the blades or the ring pieces is beneficial to meeting the first requirement, but is difficult to meet the second requirement, and the two design requirements are in conflict, which brings difficulty to the improvement of the performance of the radiation shield.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to provide a radiation protection device for measuring the ground temperature. The radiation protection device is composed of an upper reflecting plate, a lower reflecting plate and four-surface fan blade reflecting covers, wherein a circular truncated cone-shaped air guide cover is embedded in each reflecting cover, the temperature sensor is arranged in the middle of the reflecting cover, and the peripheral fan blades and the reflecting plates can effectively block direct solar radiation, underlay surface reflected radiation, underlay surface long-wave radiation, scattered radiation and the like, so that radiation errors are reduced. Meanwhile, the fan blades and the air guide sleeve can increase the speed of air flow around the temperature sensor, and radiation errors are further reduced.

In order to solve the technical problems, the utility model provides a radiation protection device for measuring ground temperature according to the following technical scheme, which comprises a reflector, a frame body, a reflector, a flow guide cover, a heat insulation column and a temperature sensor, wherein the frame body is connected with the reflector through the heat insulation column, the reflector and the flow guide cover are arranged in the frame body, the reflector is arranged on the periphery of the flow guide cover, the flow guide cover is provided with an air inlet and an air outlet, and the temperature sensor is arranged at the air outlet.

Preferably, the reflector comprises an upper reflector and a lower reflector, and the frame is arranged between the upper reflector and the lower reflector.

Preferably, the reflector is composed of fan blades, and streamline gaps are formed between adjacent fan blades.

Preferably, the number of the reflectors is 4, and the reflectors are respectively located on the inner wall of the frame body.

Preferably, the opening of the air guide sleeve is large outside and small inside, and the inner surface of the air guide sleeve is coated with a black absorption layer.

Preferably, the number of the air guide sleeves is 4, and the temperature sensors are positioned at the central intersection of the 4 air guide sleeves.

Preferably, the reflector plate and the reflector are selected from silver, copper and aluminum.

Preferably, the surfaces of the reflector and the reflector are both plated with reflective materials, and the reflective materials are selected from silver, nickel and aluminum.

The utility model has the beneficial effects that:

the device is internally permeable up and down, the upper and lower surfaces are provided with the reflecting plates, the direct solar radiation and ground reflection of the upper and lower sides can be effectively blocked on the basis of ensuring the ventilation, the temperature sensor 6 is arranged at the center of the air guide sleeve 4, the fan blade structure of the four-surface reflecting sleeve 3 can effectively block the influence of various radiations on the temperature sensor 6, the inner wall of the inner part of the reflecting sleeve is flat and smooth and is coated with a black absorbing layer, the radiation error caused by secondary radiation can be effectively reduced, in addition, the air inlet of the air guide sleeve 4 is larger than the air outlet, the external air flow can be effectively guided, the cross section of the reflecting sleeve 3 is in a fan blade shape, the air flows in any direction, the flow direction of the air is in a streamline direction, the circulation of natural wind in the device can be effectively guided, the speed of the air flow around the temperature sensor 6 can be effectively accelerated, and the radiation error can be further reduced.

Drawings

FIG. 1 is a schematic view of a radiation shield of the present invention;

fig. 2 is a left side view of the radiation shield of the present invention;

fig. 3 is a front view of the radiation shield of the present invention;

fig. 4 is a top view of the radiation shield of the present invention;

description of reference numerals:

10-reflector, 1-upper reflector, 2-lower reflector, 3-reflector, 4-air guide sleeve, 5-heat insulation column, 6-temperature sensor and 7-frame.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Example 1

The radiation protection device of the present invention, as shown in fig. 1, has a structure that can effectively block solar radiation and effectively ensure ventilation in the device. The radiation protection device comprises a frame body 7, a reflector 10, a reflector 3, a flow guide cover 4, a heat insulation column 5 and a temperature sensor 6, wherein one end of the heat insulation column 5 is arranged on the reflector 10, the other end of the heat insulation column is connected with the frame body 7, the reflector 3 is arranged inside the frame body 7, the cover body base of the reflector 3 is connected with the frame body 7, the flow guide cover 4 is arranged at the center of the base of the reflector 3, and fan blades which are radially distributed are arranged outside the center. The temperature sensor 6 is arranged at the center inside the air guide sleeve 4, and air vents are arranged at the base part of the reflecting cover 3 and two ends of the air guide sleeve 4. The cross-sectional diameter of the reflector 3 gradually decreases along the direction from the outer wall of the frame 7 to the center, which is beneficial to guiding airflow from the outside to the inside of the air guide sleeve 4 and increasing the airflow speed around the temperature sensor 6. Preferably, the reflector 3 is formed by overlapping fan blades in radiation distribution, so that direct solar radiation, underlay surface radiation, long-wave radiation, scattered radiation and the like are difficult to directly irradiate the temperature sensor 6 positioned inside. Under any wind direction condition, the airflow can enter the device in a streamline path under the guidance of the fan blade gap, and relatively high wind speed is kept when the airflow reaches the surface of the temperature sensor 6, so that the radiation-induced error is reduced. Better, reflector and kuppe 4 set up 4, all set up around framework 7, and temperature sensor 6 is located the intersection region between 4 kuppe 4, through 4 kuppe 4's guide when the air current flows in, makes the gas around the temperature sensor 6 constantly flow from top to bottom to avoid the thermal pollution effect that the ventilation duct wall arouses to a certain extent, also be favorable to reducing the radiation error. Preferably, the reflector 3 has a tetrahedron shape, each surface is formed by ten blades in a ring shape, each blade has a curved streamline shape, and the surface is curved and smooth and is bent from outside to inside. The air guide sleeve 4 is in a hollow round table shape.

Further, the reflector 10 is divided into an upper reflector 1 and a lower reflector 2, which are respectively disposed on the upper and lower sides of the reflector 3. The upper reflector 1 and the lower reflector 2 are connected by 4 equally spaced heat-insulating columns 5, so that the radiation temperature rise caused by direct radiation of the sun from the upper part can be effectively reduced, and the heat conduction between the upper reflector 1 and the lower reflector 2 can be reduced. The upper reflector 1 and the lower reflector 2 are made of metal with high reflectivity, so that good mechanical performance can be improved, radiation influence is reduced, airflow entering the device is not overhigh in temperature due to radiation, and the thermal pollution effect is avoided. Preferably, the upper reflector 1 and the lower reflector 2 are made of silver, copper, aluminum or other high-reflectivity materials, the surface of the reflector 3 can be coated with aluminum foil and the like, and the heat insulation column 5 is made of a low-conduction thermal coefficient material. The upper surface and the lower surface of the reflector 3 are not closed, and the black absorbing layer is coated inside the reflector, so that the conduction of air flow in the reflector and the diffusion of radiant heat are facilitated.

According to simulation verification, under the same environmental condition, the radiation error of the temperature sensor can be reduced to 0.1 ℃ magnitude by the ground air temperature measurement radiation protection device, while the radiation error of the traditional louver box and the natural ventilation radiation protection cover reaches 1 ℃ magnitude, so that the radiation error of the temperature sensor is reduced by the radiation protection device. Compared with the traditional blade type louver box and the ring-blade type radiation shield, the radiation shield has the advantages of small volume, light weight, cost reduction, relatively simple structure, easy processing, manufacturing, maintenance, installation and cleaning, capability of normally working under the complex conditions of unequal wind directions and high reliability.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. The utility model provides a ground temperature measurement radiation protection device which characterized in that: the heat-insulation type solar heat collector comprises a reflector (10), a frame body (7), a reflector (3), a flow guide cover (4), a heat-insulation column (5) and a temperature sensor (6), wherein the reflector (10) is arranged on the frame body (7) through the heat-insulation column (5); the reflector (3) and the air guide sleeve (4) are arranged inside the frame body (7), the reflector (3) is arranged on the periphery of the air guide sleeve (4), and the temperature sensor (6) is arranged at an air outlet of the air guide sleeve (4).

2. The radiation protection device for ground air temperature measurement according to claim 1, characterized in that: the reflector (10) comprises an upper reflector (1) and a lower reflector (2), and the frame body (7) is arranged between the upper reflector (1) and the lower reflector (2).

3. The radiation protection device for ground air temperature measurement according to claim 1, characterized in that: the cover body of the reflecting cover (3) is provided with a plurality of fan blades, and gaps are reserved between the adjacent fan blades.

4. The radiation protection device for ground air temperature measurement according to claim 3, wherein: the number of the reflectors (3) is 4, and the reflectors are located on different inner walls of the side wall of the frame body (7).

5. The radiation protection device for ground air temperature measurement according to claim 1, characterized in that: the inside diameter of the opening of the air guide sleeve (4) is large outside and small inside, and the inner surface of the air guide sleeve (4) is coated with a black material absorption layer.

6. The radiation protection device for ground air temperature measurement according to claim 5, wherein: the number of the air guide sleeves (4) is 4, and the temperature sensors (6) are located at the center intersection of the air outlets of the 4 air guide sleeves (4).

7. The radiation protection device for ground air temperature measurement according to claim 1, characterized in that: the material of the reflector (3) and the reflector (10) is selected from silver, copper or aluminum.

8. The radiation protection device for ground air temperature measurement according to claim 5, wherein: and the surfaces of the reflector (3) and the reflector (10) are plated with reflective layers, and the reflective layers are made of silver, nickel or aluminum.