CN220136943U - Dynamic specific surface area analyzer - Google Patents

Abstract

The utility model relates to the field of physical adsorption, in particular to a dynamic specific surface area analyzer, which aims to solve the problem that the use of the dynamic specific surface area analyzer in the prior art is limited by the environment. For this purpose, the dynamic specific surface area analyzer of the present utility model comprises: the cold trap device comprises a direct-cooling trap pipe and an air outlet pipe, the direct-cooling trap pipe is provided with an air inlet, the air outlet pipe is inserted into the direct-cooling trap pipe, the air outlet pipe is provided with a first port and a second port, the first port is positioned inside the direct-cooling trap pipe, the second port is positioned outside the direct-cooling trap pipe, and the first port is not contacted with the bottom of the direct-cooling trap pipe; the thermal conductivity detector is provided with a reference arm and a measuring arm, the second port is communicated with the reference arm, and mixed gas enters the direct-cooling trap tube from the air inlet and then flows through the first port, the second port, the reference arm, the sample tube and the measuring arm. The direct-cooled trap tube is not easy to block, the influence of the environment on measurement can be avoided as much as possible, and the measurement precision and efficiency are improved.

Description

Dynamic specific surface area analyzer

Technical Field

The utility model relates to the field of physical adsorption, and particularly provides a dynamic specific surface area analyzer.

Background

The use environments of the existing dynamic specific surface area measuring instrument are different, the humidity and the environment temperature of different areas are different, and the temperature and the humidity can influence the testing precision of the dynamic specific surface area measuring instrument. In order to ensure the measurement accuracy, it is necessary to remove moisture contained in the air, and the pipeline is easily blocked when removing moisture in a region with high air humidity, so that the use of the conventional dynamic specific surface area measuring instrument is limited by the environment.

The ambient temperature can change in the measurement process, and the thermal conductivity detector also can generate heat during operation, and when a plurality of thermal conductivity detectors simultaneously work, temperature difference can be produced between each thermal conductivity detector, and then the measurement accuracy is influenced. The accuracy of the measurement is also affected if air leakage occurs during the measurement. The existing U-shaped cold trap pipe is easy to block, and can contain less moisture and dirt, so that the use of the dynamic tester can be influenced by the use environment. In the prior art, cold trap pipes are placed in a liquid nitrogen cup, the occupied space of the cold trap pipes adopted in the prior art is too large, so that the quantity of the cold trap pipes which can be placed in the liquid nitrogen cup is small, and the working efficiency of the cold trap is low.

Accordingly, there is a need in the art for a new dynamic specific surface area analyzer to address the above-described problems.

Disclosure of Invention

The utility model aims to solve the technical problems, namely the problem that the use of a dynamic specific surface area analyzer in the prior art is limited by the environment. To this end, the present utility model provides a dynamic specific surface area analyzer comprising: the cold trap device comprises a direct cold trap pipe and an air outlet pipe, wherein the direct cold trap pipe is provided with an air inlet, the air outlet pipe is inserted into the direct cold trap pipe, the air outlet pipe is provided with a first port and a second port, the first port is positioned in the direct cold trap pipe, the second port is positioned outside the direct cold trap pipe, the first port is not contacted with the bottom of the direct cold trap pipe, and mixed air enters the direct cold trap pipe from the air inlet, flows into the air outlet pipe from the first port and flows out from the second port; the thermal conductivity detector is provided with a reference arm and a measuring arm, the second port is communicated with the reference arm, and the mixed gas flows through the reference arm, the sample tube and the measuring arm in sequence after flowing out of the second port.

In the specific embodiment with the dynamic specific surface area analyzer, the air outlet pipe is a metal pipe.

In the specific implementation mode with the dynamic specific surface area analyzer, the number of the air outlet pipes is several, and the lengths of the air outlet pipes are equal.

In the above specific embodiment with a dynamic specific surface area analyzer, the method further includes: the frame body is provided with a mounting hole, and the thermal conductivity detector is mounted on the frame body through the mounting hole.

In the specific embodiment with the dynamic specific surface area analyzer, the mounting hole is a long hole.

In the specific embodiment with the dynamic specific surface area analyzer, the cold trap device further comprises a cold trap block, the cold trap block is arranged on the frame body, the direct cold trap tube is arranged on the cold trap block, the cold trap block is provided with an air inlet channel, and the air inlet channel is communicated with the air inlet.

In the specific embodiment with the dynamic specific surface area analyzer, the mounting holes are distributed in a sector shape around the cold trap block.

In the above specific embodiment with a dynamic specific surface area analyzer, the method further includes: and a thermostat, in which the thermal conductivity detector is accommodated.

In the above specific embodiment with a dynamic specific surface area analyzer, the method further includes: the bottom plate is used for being arranged on the operation table top; the guide rail is arranged on the bottom plate along the first direction, and the frame body is arranged on the guide rail in a sliding manner along the first direction.

In the specific embodiment with the dynamic specific surface area analyzer, the through hole is formed in the bottom plate, the through hole is located below the direct-cooling trap pipe along the first direction, the liquid nitrogen cup is arranged below the through hole, and after the frame body descends, the direct-cooling trap pipe penetrates through the through hole and is inserted into the liquid nitrogen cup.

Under the condition of adopting the technical scheme, the direct-cooling trap pipe and the air outlet pipe are arranged, and when the mixed air passes through the direct-cooling trap pipe, water vapor in the mixed air is condensed in a low-temperature environment and separated from the air, so that the water vapor is prevented from entering the thermal conductivity detector to influence the testing precision. Compared with a U-shaped cold trap pipe, the direct cold trap pipe is not easy to be blocked, the influence of the environment on measurement can be avoided as much as possible, if the water vapor is condensed at the bottom of the direct cold trap pipe, the first port cannot be blocked because a certain distance exists between the first port and the bottom of the direct cold trap pipe, if the water vapor is condensed at the pipe wall of the direct cold trap pipe, the water vapor can fall at the bottom of the direct cold trap pipe after being condensed, and the first port cannot be blocked; the direct cooling trap can hold more moisture and dirt than U type cold trap, avoids freezing and leads to the circulation of mixing the gas to be obstructed, and then influences the progress and the precision of test. The direct-cooling trap can reduce the space occupied by each cold trap, and the liquid nitrogen cup with the same caliber can accommodate more cold traps, so that the working efficiency of the cold trap is improved.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a cold trap apparatus of the present utility model, showing an outlet pipe;

FIG. 2 is a schematic view of the structure of the frame body of the present utility model after being lifted in a first direction;

FIG. 3 is a schematic view showing the structure of the frame body of the present utility model after the frame body descends along the first direction;

FIG. 4 is a schematic view of a frame in a view of the present utility model, showing a second port and a reference arm;

FIG. 5 is a top view of the frame of the present utility model;

fig. 6 is a bottom view of the frame in the present utility model.

In the figure: 1. cold trap device, 11, direct cold trap pipe, 12, outlet pipe, 13, first port, 14, second port, 15, cold trap block, 16, air inlet channel, 2, thermal conductivity detector, 21, reference arm, 3, support body, 31, mounting hole, 4, constant temperature equipment, 41, heater, 42, lid, 5, bottom plate, 6, guide rail, 7, through-hole.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art can adapt it as desired to suit a particular application.

It should be noted that, in the description of the present utility model, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directional or positional relationships, and are based on the directional or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the ordinal terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Furthermore, in order to more clearly show the core technical solution of the present utility model, descriptions of well-known structures of the thermal conductivity detector are omitted in the following description, but such omission is merely for convenience of description and does not mean that the thermal conductivity detector may have no such structures.

As shown in fig. 1 to 4, the present utility model proposes a dynamic specific surface area analyzer comprising: cold trap device 1, cold trap device 1 includes straight cold trap 11 and outlet duct 12, straight cold trap 11 is cooled in the liquid nitrogen cup, there is air inlet (not shown in the figure) on straight cold trap 11, the air inlet is used for communicating with air source, outlet duct 12 inserts into straight cold trap 11, outlet duct 12 has first port 13 and second port 14, first port 13 locates inside straight cold trap 11, second port 14 locates outside straight cold trap 11, first port 13 does not contact with bottom of straight cold trap 11, space between first port 13 and bottom of straight cold trap 11 is used for storing the moisture separated, the mixed gas enters straight cold trap 11 from the air inlet, then flow into outlet duct 12 from first port 13, then flow out from second port 14; the thermal conductivity detector 2 has a reference arm 21 and a measuring arm, and the second port 14 communicates with the reference arm 21, and the mixed gas flows out from the second port 14, sequentially through the reference arm 21, the sample tube, and the measuring arm, and then out (liquid nitrogen cup, sample tube, and measuring arm are not shown in the figure).

In this embodiment, in order to solve the problem that the use of the dynamic specific surface area analyzer is limited by the environment, the direct cooling trap 11 and the air outlet pipe 12 are provided, and the vapor in the mixed gas is condensed in the low-temperature environment when passing through the direct cooling trap 11 and separated from the gas, so as to avoid the vapor entering the thermal conductivity detector 2 to affect the test accuracy. The U-shaped cold trap pipe is easy to freeze on the inner wall of the pipe, so that a pipeline is blocked, measurement is affected, especially for areas with high humidity, more water vapor in the air is easy to block, if the cold trap pipe is blocked in the test process, the cold trap pipe is still required to be replaced, compared with the U-shaped cold trap pipe, the direct cold trap pipe 11 is not easy to block, the influence of the environment on measurement can be avoided as much as possible, if the water vapor is condensed at the bottom of the direct cold trap pipe 11, a certain distance is reserved between the first port 13 and the bottom of the direct cold trap pipe 11, the first port 13 is not blocked if the water vapor is condensed at the pipe wall of the direct cold trap pipe 11, the condensed ice can drop at the bottom of the direct cold trap pipe 11, even for areas with high humidity, more water and dirt can be contained than the U-shaped cold trap pipe, and the flow of mixed air is prevented from being blocked, and the progress and the accuracy of the test are further affected by the freezing.

Compared with the U-shaped cold trap tube, the direct cold trap tube 11 can reduce the occupied space of each cold trap tube, and the liquid nitrogen cup with the same caliber can accommodate more cold trap tubes, so that the working efficiency of the cold trap is improved.

Further, in order to avoid air leakage, the air outlet pipe 12 is arranged as a metal pipe, if the hose is connected with the thermal conductivity detector 2, the hose is softer, the clamp connection is easy to air leakage, after the hose is replaced by the metal pipe, the connection with the thermal conductivity detector 2 is tighter and less easy to air leakage, the air leakage point is reduced, and the measuring precision is ensured.

Further, a plurality of direct cooling trap pipes 11 can be arranged according to actual test requirements, each direct cooling trap pipe 11 corresponds to one air outlet pipe 12 and one thermal conductivity detector 2, then the plurality of air outlet pipes 12 and the plurality of thermal conductivity detectors 2 are arranged, and in order to improve accuracy, the lengths of the plurality of air outlet pipes 12 are equal, so that the distances of mixed air flowing into the thermal conductivity detectors 2 from the air outlet pipes 12 are equal, and the measurement errors among different thermal conductivity detectors 2 are reduced. The length of outlet tube 12 may be shown to be the same in figure 1.

Further, as shown in fig. 1, the frame 3 is provided with a mounting hole 31, the thermal conductivity detector 2 is mounted on the frame 3 through the mounting hole 31, and the frame 3 is used for carrying a plurality of thermal conductivity detectors 2.

Further, since the air outlet pipe 12 is a metal pipe, the deformation of the metal pipe is small, in order to facilitate the disassembly of the air outlet pipe 12 and the thermal conductivity detector 2, the mounting hole 31 is a long hole, the thermal conductivity detector 2 is arranged on the frame body 3 through a bolt and the long hole, and when the disassembly is needed, the position of the thermal conductivity detector 2 can be moved after the bolt is loosened. In fig. 1, four mounting holes 31 are provided, and the thermal conductivity detector 2 is moved in the direction of the mounting holes 31 to be separated from the second port 14 after the bolts are loosened.

Further, the cold trap device 1 further comprises a cold trap block 15, the cold trap block 15 is arranged on the frame body 3, the direct cold trap pipe 11 is arranged on the cold trap block 15, the cold trap block 15 is provided with an air inlet channel 16, the air inlet channel 16 is communicated with the air inlet, and mixed air flows into the air inlet through the air inlet channel 16 and enters the direct cold trap pipe 11. In order to facilitate clamping of a plurality of direct-cooled trap pipes 11, a cold trap block 15 is arranged in the utility model, and the direct-cooled trap pipes 11 are arranged on the frame body 3 through the cold trap block 15. Four direct cold trap tubes 11 are provided on the cold trap block 15 in fig. 2.

Further, as shown in fig. 1, 5 and 6, since the air outlet pipe 12 is to be kept connected to the thermal conductivity detector 2, the direct cooling trap 11 is provided on the frame 3 through the cold trap block 15; since the lengths of the air outlet pipes 12 are all equal, the distances between the air outlet pipes 12 and the thermal conductivity detectors 2 are also equal, and in order to facilitate the arrangement of the thermal conductivity detectors 2, the mounting holes 31 are distributed in a fan shape around the cold trap block 15, so that the distances between each thermal conductivity detector 2 and the air outlet pipe 12 are equal. In fig. 5, four direct cold trap pipes 11 are provided, corresponding to four thermal conductivity detectors 2, the four thermal conductivity detectors 2 are distributed in a fan shape around the cold trap block 15.

Further, since the mounting holes 31 are distributed in a fan shape around the direct cooling trap pipe 11, the frame body 3 may be provided in a fan shape. As shown in fig. 5 and 6, the edge of the frame 3 below the thermal conductivity detector 2 is provided in a fan shape.

Further, the method further comprises the following steps: a thermostat 4, and a thermal conductivity detector 2 is accommodated in the thermostat 4. In order to avoid that the measurement accuracy of the thermal conductivity detector 2 is affected by the difference of the temperatures of the use environments, a constant temperature device 4 is provided, and the thermal conductivity detector 2 is accommodated in the constant temperature device 4, so that the measurement accuracy of the thermal conductivity detector 2 is not affected no matter the temperature of the external environment. The thermal conductivity detector 2 during operation also can generate heat, and the calorific capacity of different thermal conductivity detectors 2 is also different, leads to there to be the temperature difference between the thermal conductivity detectors 2, and the existence of constant temperature equipment 4 can reduce the temperature difference between the thermal conductivity detectors 2, reduces the influence that the temperature difference brought and makes, and the measurement is more accurate.

As shown in fig. 1 and 3, the thermostat 4 includes a heater 41 and a cover 42, the cover 42 is disposed on the frame 3, a constant temperature chamber is formed between the cover 42 and the frame 3, and the heater 41 and the thermal conductivity detector 2 are both disposed in the accommodating chamber. The heater may be a heating fan or other devices as long as the temperature in the accommodating chamber can be controlled to a certain temperature.

Since the thermal conductivity detectors 2 need to maintain the sensitivity of measurement at a certain temperature to ensure the accuracy of the measurement result, the measurement result is relatively accurate when the working temperature of the thermal conductivity detectors 2 is about fifty degrees, and if the temperature difference between the thermal conductivity detectors 2 is reduced by adopting the cooling device, the sensitivity of the thermal conductivity detectors 2 is affected, so that the temperature difference between the thermal conductivity detectors 2 is reduced by adopting the heater 41 to maintain each thermal conductivity detector 2 at the same temperature, the temperature difference between the thermal conductivity detectors 2 can be reduced, and the measurement sensitivity of the thermal conductivity detectors 2 is not affected. In addition, the thermal conductivity detector 2 needs to be heated to about fifty degrees and then starts to measure, the thermal conductivity detector 2 is slowly heated in the working process, and the working temperature can be reached to test after the thermal conductivity detector works for half an hour, and the environmental temperature can be directly raised to about fifty degrees through the heater 41, so that the heating time is shortened, and the measuring efficiency is improved.

Further, as shown in fig. 2 and 3, since the space of the whole apparatus is relatively small, a base plate 5 and a guide rail 6 are provided for facilitating the later inspection and maintenance, the base plate 5 being for being provided on the operation table; the guide rail 6 is provided on the bottom plate 5 in the first direction, and the frame body 3 is slidably provided on the guide rail 6 in the first direction. The first direction is vertical direction, and when the maintenance is needed, the support body 3 slides upwards along the first direction, and because the direct cooling trap 11, the cold trap block 15 and the thermal conductivity detector 2 are all arranged on the support body 3, the direct cooling trap 11, the cold trap block 15 and the thermal conductivity detector 2 can slide upwards along with the support body 3, and slide to the position above the table top where the direct cooling trap 11 and the thermal conductivity detector 2 are exposed, so that the working personnel can conveniently detect whether air leakage exists or not, and the damaged part can be conveniently replaced. When maintenance is not needed, the frame body 3 slides downwards along the first direction and returns to the original working position.

Further, as shown in fig. 3, since the direct-cooling trap 11 needs to be placed in a liquid nitrogen cup, a through hole 7 is provided in the bottom plate 5, the through hole 7 is located below the direct-cooling trap 11 in the first direction, the liquid nitrogen cup is provided below the through hole 7, the direct-cooling trap 11 is inserted into the liquid nitrogen cup through the through hole 7 after the frame 3 descends, and the direct-cooling trap 11 descends below the operation table.

It should be noted that although four straight cold trap tubes are shown, this is not a limitation of the present utility model, and that other numbers of straight cold trap tubes may be used by those skilled in the art without departing from the basic principles of the present utility model, so long as the distance of the outlet tube from the thermal conductivity detector is kept equal. For example, three direct cold trap tubes are used simultaneously, all without departing from the principles of the present utility model and therefore all would fall within the scope of the present utility model.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims (10)

1. A dynamic specific surface area analyzer, comprising:

cold trap device (1), cold trap device (1) includes straight cold trap pipe (11) and outlet duct (12), be provided with the air inlet on straight cold trap pipe (11), outlet duct (12) inserts in straight cold trap pipe (11), outlet duct (12) have first port (13) and second port (14), first port (13) are located straight cold trap pipe (11) is inside, second port (14) are located the outside of straight cold trap pipe (11), first port (13) do not with the bottom of straight cold trap pipe (11) contacts, the gas mixture gets into straight cold trap pipe (11) from the air inlet, then follow first port (13) inflow outlet duct (12), again follow second port (14) outflow;

the thermal conductivity detector (2), the thermal conductivity detector (2) has reference arm (21) and measurement arm, second port (14) with reference arm (21) intercommunication, the gas mixture is followed second port (14) flow through in proper order reference arm (21), sample cell and measurement arm after flowing out.

2. The dynamic specific surface area analyzer as set forth in claim 1, wherein,

the air outlet pipe (12) is a metal pipe.

3. The dynamic specific surface area analyzer as set forth in claim 1, wherein,

the number of the air outlet pipes (12) is several, and the lengths of the air outlet pipes (12) are equal.

4. The dynamic specific surface area analyzer as set forth in claim 3, further comprising:

the thermal conductivity detector comprises a frame body (3), wherein a mounting hole (31) is formed in the frame body (3), and the thermal conductivity detector (2) is mounted on the frame body (3) through the mounting hole (31).

5. The dynamic specific surface area analyzer as set forth in claim 4, wherein,

the mounting holes (31) are strip holes.

6. The dynamic specific surface area analyzer as set forth in claim 4, wherein,

the cold trap device (1) further comprises a cold trap block (15), the cold trap block (15) is arranged on the frame body (3), the direct cold trap tube (11) is arranged on the cold trap block (15), an air inlet channel (16) is formed in the cold trap block (15), and the air inlet channel (16) is communicated with the air inlet.

7. The dynamic specific surface area analyzer as set forth in claim 6, wherein,

the mounting holes (31) are distributed in a fan shape around the cold trap block (15).

8. The dynamic specific surface area analyzer as set forth in claim 1, further comprising:

-a thermostat device (4), said thermal conductivity detector (2) being housed inside said thermostat device (4).

9. The dynamic specific surface area analyzer as set forth in claim 6, further comprising:

a base plate (5), the base plate (5) being arranged on the operating table top;

the guide rail (6), guide rail (6) are along first direction setting on bottom plate (5), support body (3) are along first direction slip setting on guide rail (6).

10. The dynamic specific surface area analyzer as set forth in claim 9, wherein,

be provided with through-hole (7) on bottom plate (5), through-hole (7) are located along the first direction direct cooling trap pipe (11) below, the below of through-hole (7) is provided with the liquid nitrogen cup, support body (3) back descends, direct cooling trap pipe (11) pass through-hole (7) insert in the liquid nitrogen cup.