A gas drying device with a radon daughter filtering function

Abstract

The present invention belongs to the field of radioactive detection equipment, and particularly relates to a gas drying device with a radon daughter filter function, comprising: an intake chamber, a dust filter chamber, a drying tube, and a radon daughter filter device. The intake chamber is detachably connected to the dust filter chamber, the intake chamber is detachably connected to the drying tube, and the drying tube is detachably connected to the radon daughter filter device. The device of the present invention integrates the functions of radon daughter filtration and gas drying. The overall structure is designed to be lightweight and portable, with unified interfaces and simple gas path connections, and is suitable for general environmental radon measuring instruments.

Description

Technical Field

[0001] The present invention belongs to the field of radioactive detection equipment, and particularly relates to a gas drying device with a radon daughter filter function. Background Art

[0002] The radon gas pollution in the environment has become a major radioactive pollution source. Radon has a strong adsorption ability and can be adsorbed by almost all solids, especially loose and porous substances, increasing the indoor radiation level and thus endangering people's physical health. In recent years, the measurement of the radioactive content of radon in ambient air has received extensive attention.

[0003] There are various methods for measuring radon in ambient air, and the commonly used one is the pump suction electrostatic collection energy spectrum analysis method. This method uses an active pump suction type to inhale the radon-containing gas into the high-pressure chamber, and the 218 positively charged particles generated by the decay of radon gas are rapidly adsorbed onto the detector surface under the action of an electric field and then detected.

[0004] This method can accurately measure the content of radon in the environment, but it is necessary to filter out the influence of radon daughters in the environment in advance. In addition, when using this method for measurement, the polarized water molecules are very easy to act with the 218 positively charged Po to make it a neutral particle, reducing the system collection efficiency. Therefore, the influence of humidity on this detection method cannot be ignored.

[0005] Therefore, there is an urgent need to develop a device for the pretreatment of environmental radon measurement, which can not only filter out radon daughters in the environment but also reduce the humidity in the environment. Summary of the Invention

[0006] The purpose of the present invention is to provide a gas drying device with a radon daughter filter function. This device integrates the functions of radon daughter filtration and gas drying. The overall structure is designed to be light and easy to carry, with unified interfaces and simple gas path connections, and is suitable for general environmental radon measuring instruments.

[0007] The technical solution for achieving the purpose of the present invention: A gas drying device with a radon daughter filter function, the device includes: an intake chamber, a dust filter chamber, a drying tube, and a radon daughter filter device. The intake chamber is detachably connected to the dust filter chamber, the intake chamber is detachably connected to the drying tube, and the drying tube is detachably connected to the radon daughter filter device.

[0008] Further, the intake chamber includes: an intake chamber main body, a first groove, an intake port, and a drainage port. The first groove is arranged at the upper end of the side wall of the intake chamber main body; the intake port is arranged on the outer side wall of the intake chamber main body and is connected to the side wall of the intake chamber main body in a through manner; the drainage port is arranged on the outer side wall of the intake chamber main body and is connected to the side wall of the intake chamber main body in a through manner;

[0009] The dust filter chamber includes: a dust filter chamber main body, a dust removal filter element, and a top cover. The dust removal filter element is disposed in the inner cavity of the dust filter chamber main body. The top cover is provided above the dust filter chamber main body and is detachably connected to the dust filter chamber main body. The dust removal filter element is tightly abutted against the bottom of the inner cavity of the dust filter chamber main body and the bottom of the top cover respectively. A first central hole penetrating the dust filter chamber main body is provided at the center position of the bottom of the dust filter chamber main body. A second central hole penetrating the top cover is provided at the center position of the top cover.

[0010] The drying tube includes: a drying tube main body, a spring, a spring pressing piece, and a desiccant. The spring and the spring pressing piece are sequentially disposed in the cavity of the drying tube main body. The spring is close to one end of the drying tube main body. The spring pressing piece is adjacent to the end of the spring far from the drying tube main body. The spring and the spring pressing piece are respectively movably connected to the inner wall of the cavity. The desiccant is filled in the cavity.

[0011] The radon progeny filtering device includes: a filter membrane holder, an end cover, and a radon progeny filtering membrane. The bottom of the end cover is provided with a first boss and a second boss from bottom to top in sequence. The diameter of the first boss is matched with the outer diameter of the drying tube. The diameter of the second boss is matched with the outer diameter of the filter membrane holder. The filter membrane holder is detachably connected to the second boss of the end cover. A downward-opening lower groove is provided on the upper end surface of the second boss. An upward-opening upper groove is provided on the upper end surface of the filter membrane holder. The upper groove and the lower groove form a cavity. The radon progeny filtering membrane is disposed in the cavity formed by the upper groove and the lower groove.

[0012] Further, the air inlet chamber is detachably connected to the dust filter chamber by a thread. The air inlet chamber is detachably connected to the drying tube by a thread. The drying tube is detachably connected to the radon progeny filtering device by a thread.

[0013] Further, the air inlet chamber further includes a seal ring A. The seal ring A is disposed at the bottom of the first groove and is tightly abutted against the bottom of the first groove and one end of the drying tube respectively.

[0014] Further, a first flange is provided along the circumferential direction at the bottom of the dust filter chamber main body, and the first flange is tightly abutted against the end of the side wall of the air inlet chamber.

[0015] Further, ventilation holes penetrating the top cover are uniformly provided along the circumferential direction of the second central hole on the top cover.

[0016] Further, a second flange is provided along the circumferential direction of the second central hole at the bottom of the top cover, and the second flange is tightly abutted against the dust removal filter element.

[0017] Further, the dust removal filter element is in a gear-shaped structure.

[0018] Further, the desiccant is a material that changes color when encountering water.

[0019] Further, the drying tube further includes a warning line, which is arranged on the outer wall of the drying tube body and is close to the other end of the drying tube body.

[0020] Further, the radon daughter filter device further includes a sealing ring B. A second groove is arranged along the circumferential direction of the end of the upper end surface of the first boss. The sealing ring B is arranged in the second groove, and the sealing ring B is tightly abutted against the bottom of the second groove and the other end of the drying tube respectively.

[0021] Further, a cut is formed on the lower end surface of the filter membrane holder.

[0022] Further, air outlet holes penetrating through the filter membrane holder are arranged on the filter membrane holder.

[0023] The beneficial technical effects of the present invention are as follows:

[0024] 1. The intake chamber in the gas drying device with radon daughter filtering function of the present invention can effectively prevent water from entering the gas circuit during the sampling process;

[0025] 2. The gas drying device with radon daughter filtering function of the present invention designs a dust filtering chamber in the intake direction, and the sampling gas can be effectively purified through the polymer filter element;

[0026] 3. The gas drying device with radon daughter filtering function of the present invention arranges a combination of a spring and a spring pressing piece in the inner cavity of the drying tube to compact and fix the desiccant in the inner cavity, reduce the voids, enable the gas to fully contact with the desiccant, and achieve a good drying effect;

[0027] 4. The gas drying device with radon daughter filtering function of the present invention integrates gas drying and radon daughter filtering into one. The gas passing through this device can be directly used for environmental radon measurement, simplifying the gas circuit connection. Description of the Drawings

[0028] Figure 1 is a schematic cross-sectional structure view of a gas drying device with radon daughter filtering function provided by the present invention;

[0029] Figure 2 is a schematic cross-sectional structure view of the intake chamber in the gas drying device with radon daughter filtering function provided by the present invention;

[0030] Figure 3 is a side view of the intake chamber in the gas drying device with radon daughter filtering function provided by the present invention;

[0031] Figure 4 is a schematic cross-sectional structure view of the dust filtering chamber in the gas drying device with radon daughter filtering function provided by the present invention;

[0032] Figure 5 Schematic structural diagram of the top cover of the dust filter bin in a gas drying device with a radon daughter filter function provided by the present invention;

[0033] Figure 6 Schematic sectional view of the drying tube in a gas drying device with a radon daughter filter function provided by the present invention;

[0034] Figure 7 Schematic sectional view of the radon daughter filter device in a gas drying device with a radon daughter filter function provided by the present invention.

[0035] In the figure: 1 - intake chamber; 2 - dust filter bin; 3 - drying tube; 4 - radon daughter filter device; 101 - intake chamber main body; 102 - first groove; 103 - intake port; 104 - drain port; 105 - seal ring A; 201 - dust filter bin main body; 202 - dust removal filter element; 203 - top cover; 301 - drying tube main body; 302 - spring; 303 - spring pressing piece; 304 - warning line; 401 - filter membrane holder; 402 - end cover; 403 - radon daughter filter membrane; 404 - second groove; 405 - seal ring B. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0037] As Figure 1 shown, the present invention provides a gas drying device with a radon daughter filter function, including: an intake chamber 1, a dust filter bin 2, a drying tube 3, and a radon daughter filter device 4. The intake chamber 1 is detachably connected to the dust filter bin 2 by threads, the intake chamber 1 is detachably connected to the drying tube 3 by threads, and the drying tube 3 is detachably connected to the radon daughter filter device 4 by threads.

[0038] As Figures 2-3 shown, the intake chamber 1 is made of a cylindrical body with a height of 40 mm, an inner diameter of 41 mm, and an outer diameter of 65 mm. The main material used is PC plastic, and the single-sided wall thickness is 12 mm. The intake chamber 1 includes: an intake chamber main body 101, a first groove 102, an intake port 103, a drain port 104, and a seal ring A 105.

[0039] As Figure 2 shown, the first groove 102 is provided at the upper end of the side wall of the intake chamber main body 101, and the width of the first groove 102 matches the wall thickness of the drying tube 3.

[0040] As Figure 1As shown, an internal thread is provided on the outer wall of the first groove 102, and an external thread is provided on the outer periphery of one end of the drying tube 3. The drying tube 3 is threadedly connected to the intake chamber 1. The sealing ring A 105 is disposed at the bottom of the first groove 102. When the drying tube 3 is threadedly connected and tightened with the intake chamber 1, the sealing ring A 105 is respectively pressed against the bottom of the first groove 102 and one end of the drying tube 3, so that there is good sealing between the drying tube 3 and the intake chamber 1.

[0041] As Figure 2 shown, the air inlet 103 is provided on the outer side wall of the intake chamber main body 101. The air inlet 103 is connected to the side wall of the intake chamber main body 101 in a penetrating manner and serves as the connection port for the rubber hose.

[0042] As Figure 3 shown, the drain port 104 is provided on the outer side wall of the intake chamber main body 101. The bottom of the outer periphery of the drain port 104 is flush with the bottom of the intake chamber main body 101. The drain port 104 is connected to the side wall of the intake chamber main body 101 in a penetrating manner. The drain port 104 can also be used as a pressure relief valve. The bottom of the intake chamber 1 is kept flat so that the device can be vertically placed on the working plane. The intake chamber 1 can prevent the water in the sampling environment from being pumped into the inside of the drying tube by the air pump.

[0043] As Figure 1 and Figure 4 shown, the dust filter chamber 2 is located behind the intake chamber 1 and can effectively filter out a small amount of water mist and fine dust in the sampling gas to prevent fine dust from entering the instrument measurement chamber. The dust filter chamber 2 includes: a dust filter chamber main body 201, a dust removal filter element 202, and a top cover 203.

[0044] As Figure 1 and Figure 4 shown, an inner cavity is provided inside the dust filter chamber main body 201. The opening of the inner cavity faces upward and the inner cavity is coaxial with the dust filter chamber main body 201. An external thread is provided on the outer periphery of the dust filter chamber main body 201, and an internal thread is provided on the inner wall of the cavity of the intake chamber main body 101. The dust filter chamber 2 is threadedly connected to the intake chamber 1. A first flange is provided on the bottom of the dust filter chamber main body 201 along the circumferential direction. When the dust filter chamber 2 is threadedly connected and tightened with the intake chamber 1, the first flange is pressed against the end of the side wall of the intake chamber 1 to avoid excessive connection between the dust filter chamber 2 and the intake chamber 1. A first central hole is provided at the center position of the bottom of the dust filter chamber main body 201, and the first central hole penetrates the bottom of the dust filter chamber main body 201.

[0045] As Figures 4-5As shown in the figure, the dust removal filter element 202 is arranged in the inner cavity of the dust filter bin main body 201. The dust removal filter element adopts a white polymer filter element and is sintered into a gear-shaped structure. The top cover 203 is arranged above the dust filter bin main body 201, and the top cover 203 is detachably connected to the dust filter bin main body 201. A second central hole is provided at the central position of the top cover 203, and multiple circles of ventilation holes are evenly arranged along the circumferential direction of the second central hole. The second central hole and the ventilation holes penetrate through the top cover 203, enabling gas to uniformly pass through the filter element from all directions, and filtering particulate matter or fine dust, etc. inside the dust filter bin. At the bottom of the top cover 203, a second flange is provided along the circumferential direction of the second central hole. The second flange is tightly pressed against the dust removal filter element 202, and is used to tightly press and fix the dust removal filter element 202 in the inner cavity of the dust filter bin main body 201, so that the dust removal filter element 202 is respectively tightly pressed against the bottom of the inner cavity of the dust filter bin main body 201 and the bottom of the top cover 203.

[0046] As Figure 6 shown, the inner diameter of the drying tube 3 is 50 mm and the height is 200 mm. The drying tube 3 includes: a drying tube main body 301, a spring 302, a spring pressing piece 303, a warning line 304, and a desiccant. A through cavity is provided inside the drying tube main body 301. The spring 302 and the spring pressing piece 303 are sequentially arranged in the cavity. One end of the spring 302 is close to the drying tube main body 301, and the spring pressing piece 303 is adjacent to the end of the spring 302 far from the drying tube main body 301. The spring 302 and the spring pressing piece 303 are respectively movably connected to the inner wall of the cavity, and the desiccant is filled in the cavity.

[0047] By adding a combination of the spring 302 and the spring pressing piece 303 that are movably connected to the inner wall of the cavity at one end of the drying tube main body 301, that is, the air inlet direction, the desiccant filled in the cavity is compacted, preventing the desiccant from shaking in the cavity, reducing the passage of gas through the edge gaps of the cavity, and enabling the gas to fully contact the desiccant, so that the device achieves a good drying effect.

[0048] The desiccant is a material that changes color when encountering water. For example, orange gel particle desiccant changes from orange to dark green after absorbing water. The water absorption situation of the desiccant can be judged by the change in the color of the desiccant.

[0049] As Figure 6 shown, a warning line 304 is provided on the outer wall near the other end of the drying tube main body 301. When the length of the discolored desiccant in the cavity is longer than this warning line (when the device is placed horizontally) or the height is higher than this warning line (when the device is placed vertically), it indicates that the desiccant is approaching saturation in water absorption at this time, the drying effect is not good, and a new desiccant needs to be replaced.

[0050] As Figure 7As shown in the figure, the radon daughter filter device 4 includes: a filter membrane holder 401, an end cap 402, a radon daughter filter membrane 403, and a sealing ring B405. At the bottom of the end cap 402, a first boss and a second boss are successively provided from bottom to top. The diameter of the first boss matches the outer diameter of the drying tube 3, and the diameter of the second boss matches the outer diameter of the filter membrane holder 401. The filter membrane holder 401 is detachably connected to the second boss of the end cap 402 by threaded connection. On the upper end surface of the second boss, a lower groove with an opening downward is provided, and on the upper end surface of the filter membrane holder 401, an upper groove with an opening upward is provided. The upper groove and the lower groove form a cavity, and the height of the cavity is slightly higher than the thickness of the radon daughter filter membrane 403. The radon daughter filter membrane 403 is arranged in the cavity formed by the upper groove and the lower groove, and there is a certain space above and below the radon daughter filter membrane 403 for gas to pass through. The radon daughter filter membrane 403 preferably uses a material with a large porosity, such as silk floss. The diameter of the radon daughter filter membrane is 40 mm, the thickness is 0.5 mm, and the pore diameter is 40 μm. After the radon-containing gas passes through this filter membrane, the radon daughters are filtered out.

[0051] As Figure 7 shown in the figure, on the upper end surface of the first boss, a second groove 404 is provided along the circumferential direction of the end. The width of the second groove 404 matches the wall thickness of the drying tube 3. An internal thread is provided on the inner circumference of the first boss, and an external thread is provided on the outer circumference of the other end of the drying tube 3. The drying tube 3 and the radon daughter filter device 4 are connected by threaded connection. The sealing ring B405 is arranged in the second groove 404. When the drying tube 3 and the radon daughter filter device 4 are tightened by threaded connection, the sealing ring B405 is respectively tightened against the bottom of the second groove 404 and the other end of the drying tube 3. Setting the sealing ring B405 in the second groove 404 can improve the sealing performance of the whole device.

[0052] As Figure 7 shown in the figure, a notch is provided on the lower end surface of the filter membrane holder 401, which is convenient for users to use common tools to remove the filter membrane holder 401 from the end cap 402 and replace the filter membrane regularly. On the filter membrane holder 401, there are also two rows of air holes arranged perpendicular to each other and in a cross shape. The air holes penetrate through the filter membrane holder 401 to make the gas pass through the radon daughter filter membrane 403 as evenly as possible.

[0053] The working principle and usage process of the present invention are as follows:

[0054] The dust filter chamber 2 is connected to the intake chamber 1 through threaded fit. After filling the inner cavity of the drying tube 3 with orange glue desiccant, it is compacted in the cavity of the drying tube 3 by cooperating the spring 302 with the spring pressing piece 303, and the drying tube 3 is tightened to the intake chamber 1 through threaded connection. The radon progeny filter membrane 403 is placed at the lower groove of the end cover 402, and the filter membrane holder 401 is tightened in the end cover 402 by using an object such as a coin, and then the radon progeny filtering device 4 is cooperatively tightened with the drying tube 3, and then the device can be used for filtering radon progeny and drying gas. The gas passes through the intake chamber 1, the dust filter chamber 2, the drying tube 3 and the radon progeny filtering device 4 to obtain dry and clean sampling gas, which can be directly used for measurement.

[0055] The present invention has been described in detail above in conjunction with the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. The content not described in detail in the present invention can all adopt the prior art.

Claims

1. A gas drying device with a radon daughter filter function, characterized in that, the device comprises: an air inlet chamber (1), a dust filter chamber (2), a drying pipe (3) and a radon daughter filter device (4). The air inlet chamber (1) is detachably connected to the dust filter chamber (2), the air inlet chamber (1) is detachably connected to the drying pipe (3), and the drying pipe (3) is detachably connected to the radon daughter filter device (4); the air inlet chamber (1) comprises: an air inlet chamber main body (101), a first groove (102), an air inlet (103) and a drain port (104). The first groove (102) is arranged at the upper end of the side wall of the air inlet chamber main body (101); the air inlet (103) is arranged on the outer side wall of the air inlet chamber main body (101) and is connected to the side wall of the air inlet chamber main body (101) in a penetrating manner; the drain port (104) is arranged on the outer side wall of the air inlet chamber main body (101) and is connected to the side wall of the air inlet chamber main body (101) in a penetrating manner; the dust filter chamber (2) comprises: a dust filter chamber main body (201), a dust removal filter element (202) and a top cover (203). The dust removal filter element (202) is arranged in the inner cavity of the dust filter chamber main body (201), the top cover (203) is arranged above the dust filter chamber main body (201), the top cover (203) is detachably connected to the dust filter chamber main body (201), and the dust removal filter element (202) is respectively tightly abutted against the bottom of the inner cavity of the dust filter chamber main body (201) and the bottom of the top cover (203); a first central hole penetrating through the dust filter chamber main body (201) is arranged at the central position of the bottom of the dust filter chamber main body (201); a second central hole penetrating through the top cover (203) is arranged at the central position of the top cover (203); the drying pipe (3) comprises: a drying pipe main body (301), a spring (302), a spring pressing piece (303) and a desiccant. The spring (302) and the spring pressing piece (303) are sequentially arranged in the cavity of the drying pipe main body (301). The spring (302) is close to one end of the drying pipe main body (301), and the spring pressing piece (303) is adjacent to the end of the spring (302) far from the drying pipe main body (301). The spring (302) and the spring pressing piece (303) are respectively movably connected to the inner wall of the cavity, and the desiccant is filled in the cavity; the radon daughter filter device (4) comprises: a filter membrane frame (401), an end cover (402) and a radon daughter filter membrane (403). A first boss and a second boss are sequentially formed on the bottom of the end cover (402) from bottom to top. The diameter of the first boss is matched with the outer diameter of the drying pipe (3), and the diameter of the second boss is matched with the outer diameter of the filter membrane frame (401). The filter membrane frame (401) is detachably connected to the second boss of the end cover (402). A downward-opening lower groove is formed on the upper end surface of the second boss, and an upward-opening upper groove is formed on the upper end surface of the filter membrane frame (401). A cavity is formed by the upper groove and the lower groove, and the radon daughter filter membrane (403) is arranged in the cavity formed by the upper groove and the lower groove.

2. The gas drying device with a radon daughter filter function according to claim 1, characterized in that, The intake chamber (1) is detachably connected to the dust filter bin (2) by threads, the intake chamber (1) is detachably connected to the drying pipe (3) by threads, and the drying pipe (3) is detachably connected to the radon daughter filter device (4) by threads.

3. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that the intake chamber (1) further includes a sealing ring A (105), the sealing ring A (105) is arranged at the bottom of the first groove (102), and the sealing ring A (105) is respectively pressed against the bottom of the first groove (102) and one end of the drying pipe (3).

4. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that a first flange is provided along the circumferential direction at the bottom of the dust filter bin main body (201), and the first flange is pressed against the end of the side wall of the intake chamber (1).

5. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that vent holes penetrating through the top cover (203) are uniformly arranged along the circumferential direction of the second central hole on the top cover (203).

6. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that a second flange is provided along the circumferential direction of the second central hole at the bottom of the top cover (203), and the second flange is pressed against the dust removal filter element (202).

7. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that the dust removal filter element (202) has a gear-shaped structure.

8. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that the desiccant is a material that changes color when encountering water.

9. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that the drying pipe (3) further includes a warning line (304), the warning line (304) is arranged on the outer wall of the drying pipe main body (301), and the warning line (304) is close to the other end of the drying pipe main body (301).

10. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that the radon daughter filter device (4) further includes a sealing ring B (405), a second groove (404) is arranged along the circumferential direction of the end at the upper end surface of the first boss, the sealing ring B (405) is arranged in the second groove (404), and the sealing ring B (405) is respectively pressed against the bottom of the second groove (404) and the other end of the drying pipe (3).

11. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that a cut is provided at the lower end surface of the filter membrane holder (401).

12. A gas drying device with a radon daughter filtering function according to claim 1, characterized in that air outlet holes penetrating through the filter membrane holder (401) are provided on the filter membrane holder (401).

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