CN220020168U - Liquid level constant device and system - Google Patents
Liquid level constant device and system Download PDFInfo
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- CN220020168U CN220020168U CN202321158463.1U CN202321158463U CN220020168U CN 220020168 U CN220020168 U CN 220020168U CN 202321158463 U CN202321158463 U CN 202321158463U CN 220020168 U CN220020168 U CN 220020168U
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Abstract
The utility model relates to a liquid level constant device and a liquid level constant system in the technical field of analytical instruments; comprises an auxiliary device and an internal temperature buffer sleeve; the auxiliary device comprises a sealing cover, an adsorption test cavity, a pressure regulating pipeline, a regulating valve and a liquid level detection device; the sealing cover is provided with a through hole, the pressure regulating pipeline is arranged on the surface of the sealing cover, and the regulating valve is arranged on the pressure regulating pipeline. The auxiliary device is in sealing connection with the temperature control medium storage device, the bottom of the adsorption test cavity is immersed in the temperature control liquid, the outer wall of the adsorption test cavity and the inner wall of the temperature control medium storage device form an annular sealing cavity, the liquid level detection device is used for detecting the liquid level of the adsorption test cavity in real time, the pressure of the sealing cavity is regulated through the regulating valve and the pressure regulating pipeline, the liquid level of the adsorption test cavity is regulated to be kept unchanged, and the temperature buffer sleeve is sleeved on the test tube to provide temperature buffer, so that the constancy of a second free space value is ensured.
Description
Technical Field
The utility model relates to the technical field of analytical instruments, in particular to a liquid level constant device and a liquid level constant system.
Background
With the rapid development of material science such as nano materials, energy storage materials, catalytic materials and the like, physical adsorption technology is widely applied to analysis of adsorption capacity, specific surface area, pore size distribution, adsorption performance, separation effect and the like of solid materials, and nitrogen, argon and the like are common analysis gases. In order to control the adsorption process to be carried out step by step, the sample needs to be maintained at the phase inversion temperature of the corresponding analysis gas, for example, when nitrogen is the analysis gas, the sample needs to be soaked in liquid nitrogen, when argon is the analysis gas, the sample needs to be soaked in liquid argon, the pressure is continuously increased or reduced in the whole analysis process, after the adsorption equilibrium state is reached, the adsorption quantity of the sample at constant temperature and different partial pressures is calculated according to a gas equation, and an isotherm is obtained. And then, analyzing the isotherm by adopting different analysis models to obtain the information of the specific surface area, the pore size distribution, the pore volume and the like of the sample.
Physical adsorption, unlike chemisorption, is a nonselective weak adsorption, requiring a longer time for equilibrium to be reached at each partial pressure, whereas isotherms often require data acquisition at multiple partial pressures. The more data are collected, the more accurate the subsequent analysis results are, and the longer the time consumption is. The test tube loaded with the sample has a volume tested at normal temperature, which is a first free space; the resulting volume, tested at the test temperature (often cryogenic), is the second free space, where the test tube is partially submerged under and partially above the cryogenic liquid (e.g., liquid nitrogen, liquid argon). In calculating the adsorption amount of the sample, the effective free space of the test tube needs to be known, and the effective free space is calculated through the first free space and the second free space. Because the analysis process is longer, and the low-temperature liquid in the low-temperature storage device can be gradually volatilized, the liquid level is continuously lowered, so that the second free space is continuously changed, and further, the change of the effective free space is also caused, and thus, a lot of uncertainties are brought to the calculation of the adsorption quantity. In addition, when the first free space and the second free space are tested, the upper ends of the instrument host and the test tube are at room temperature, but the room temperature also changes along with the day and night, the four seasons change, the instrument placement position and other factors continuously change, and the instrument placement position and the low-temperature liquid level change are interwoven with each other, so that the first free space and the second free space also slightly change at any time, and the repeatability and the accuracy of the test are affected.
In order to solve the problem of the influence of the liquid level change on the free space, the prior main technologies are a porous material method and a liquid level constant method, and the two methods need an elevator, a dewar bottle and the like.
The porous material method is to wrap the porous material outside the test tube, lift the dewar to the specified position, and cool the test tube and the porous material with the low temperature liquid in the dewar. The liquid level is lowered due to volatilization of the low-temperature liquid, and the porous material sucks the low-temperature liquid to the highest position of the porous material by utilizing the capillary principle, so that the second free space is unchanged, and the effective free space is unchanged. However, in the practical situation of the method, during the long-time analysis, the liquid level is lowered, the porous material is inevitably separated from the low-temperature liquid more and is exposed on the low-temperature liquid, a temperature difference is formed from top to bottom, the second free space is caused to be smaller and smaller in practice, and the calculated adsorption quantity is caused to be lower. In the whole process, the volume of the test tube immersed in the low-temperature liquid and the volume of the test tube not immersed in the low-temperature liquid are changed continuously, so that even the same molar quantity of gas is caused, the distribution density of the gas in the test tube is changed continuously, and the value of the pressure and the adsorption test result of the sample are affected.
The liquid level constant method is to control the elevator to move up and down through a liquid level sensing system, so that the volume of a test tube immersed in low-temperature liquid is kept unchanged. In the analysis process, when the liquid level descends, the liquid level sensing system cannot contact the liquid level, the elevator slowly lifts the dewar until the liquid level sensor contacts the low-temperature liquid level, and the action is repeatedly performed, so that the second free space is considered to be fixed. In practice, when the dewar is raised, although the volume of the test tube immersed in the cryogenic liquid is unchanged, the portion of the test tube extending into the dewar and not immersed in the cryogenic liquid is gradually increased, and the temperature in the dewar is necessarily lower than room temperature, thereby causing the second free space to be actually increased, and causing the calculated adsorption amount to be higher. In the whole process, although the volume of the test tube immersed in the low-temperature liquid is not changed, the continuous increase of the gas distribution density in the part of the test tube not immersed in the low-temperature liquid also inevitably influences the pressure value and the adsorption test result of the sample.
The second free space is continuously transformed in the two modes, so that test errors are introduced, and the novel liquid level constant device provided by the utility model can well avoid the problems of the two technical schemes aiming at the problems of the method, and can be used for maintaining the analysis temperature by using volatile low-temperature liquid and non-low-temperature volatile liquid. Of course, it can also be used for analysis at different pressures, including high and low pressures.
Disclosure of Invention
In order to solve the problem that free space is easily influenced by environmental factors such as liquid level position, room temperature change and the like, realize accurate measurement of free space and realize that the whole-course second free space is kept constant, thereby improving the accuracy and repeatability of the test, the utility model discloses a liquid level constant device and a liquid level constant system, and the technical scheme of the utility model is implemented as follows:
a liquid level constant device comprises an auxiliary device and a temperature buffer sleeve;
the auxiliary device comprises a sealing cover, an adsorption test cavity, a pressure regulating pipeline, a regulating valve and a liquid level detection device;
the sealing cover is provided with a through hole, the pressure regulating pipeline is arranged on the surface of the sealing cover, the regulating valve is arranged on the pressure regulating pipeline, and the liquid level detection device is arranged in the adsorption test cavity or the through hole; the temperature buffer sleeve is arranged in the adsorption test cavity.
Preferably, the temperature buffer sleeve is made of a heat-conducting material or a porous material. The heat-conducting material can be metal, such as copper or aluminum, alloy with good heat conductivity or other heat-absorbing materials, and the porous material can be PE material or PP material.
Preferably, the liquid level detection device is selected from one of radar, a liquid level gauge and a thermometer.
Preferably, the liquid level detection device comprises a blank pipe and a pressure gauge;
the blank pipe is arranged in the adsorption test cavity, and the pressure gauge is connected with and measures the pressure of the blank pipe.
Preferably, the device further comprises a sleeve;
the sleeve is arranged on the inner wall or the outer wall of the adsorption test cavity; the sleeve is a porous material.
Preferably, a pressure sensor is further arranged on the pressure regulating pipeline.
The liquid level constant system comprises a test tube, a standard tube, a heat preservation shell, a temperature control medium storage device, a liquid level constant device and a control host, wherein the standard tube is arranged in the heat preservation shell and is connected with the test tube through a pipeline;
the auxiliary device is connected with the temperature control medium storage device in a sealing way, and the temperature buffer sleeve is sleeved on the test tube;
the control host controls the liquid level detection device and the regulating valve in a communication line or wireless connection mode.
Preferably, the device further comprises a sealing door, wherein the sealing door is in sealing connection with the temperature control medium storage device and the heat preservation shell.
In the utility model, the auxiliary device is connected with the temperature control medium storage device in a sealing way, the bottom of the adsorption test cavity is immersed into the temperature control medium (such as liquid nitrogen), and the outer wall of the adsorption test cavity and the inner wall of the temperature control medium storage device form a sealing cavity. Initially, the pressure in the sealed cavity is the same as the pressure of the adsorption test cavity liquid level. When the temperature control medium volatilizes, the liquid level of the adsorption test cavity is reduced, the pressure balance is broken, at the moment, the pressure of the sealing cavity is higher than the liquid level pressure of the adsorption test cavity, the liquid level of the adsorption test cavity rises until the pressure balance is restored, and in order to maintain the unchanged volume of the second free space, the liquid level of the adsorption test cavity is ensured to be unchanged, so that the liquid level detection device is adopted to detect the liquid level of the adsorption test cavity in real time, and the pressure of the sealing cavity is regulated through the regulating valve and the pressure regulating pipeline, so that the liquid level of the adsorption test cavity is regulated to be kept unchanged, and the constancy of the second free space value is ensured; the method is not only suitable for low pressure, but also can be applied to high pressure test, and the precision of the test result is greatly improved. Of course, if the liquid level is controlled, the pressure generated by self-volatilization can be utilized for the outlet, and the pressure can be increased by additionally filling gas into the liquid level.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only one embodiment of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view angle block diagram of an embodiment of a liquid level constant apparatus (liquid level detection apparatus and temperature buffer sleeve are not shown);
FIG. 2 is a view of the bottom angle of an embodiment of a level constancy apparatus (level detection apparatus and temperature buffer jacket are not shown);
FIG. 3 is a longitudinal section view of an embodiment of a fluid level constant apparatus (fluid level detection apparatus and temperature buffer jacket are not shown);
FIG. 4 is a block diagram of an embodiment of a temperature buffer jacket;
FIG. 5 is a schematic view of an embodiment of a fluid level invariant apparatus;
FIG. 6 is a top view of another embodiment of a level constancy apparatus (temperature buffer jacket not shown);
FIG. 7 is a longitudinal section view of another embodiment of the fluid level stabilizing apparatus (temperature buffer jacket not shown);
FIG. 8 is a schematic view of another embodiment of a fluid level constant apparatus (temperature buffer jacket not shown);
FIG. 9 is a schematic diagram of an embodiment of a fluid level invariant system;
FIG. 10 is a schematic diagram of another embodiment of a fluid level invariant system.
In the above drawings, each reference numeral indicates:
1, sealing a cover;
2, adsorbing the test cavity;
3, pressure regulating pipeline;
4, regulating a valve;
5, blank tube;
6, a temperature control medium storage device;
7, a liquid level meter;
8, a sleeve;
9, a pressure sensor;
10, testing a tube;
11, standard tube;
12, a heat preservation shell;
13, semiconductor peltier;
14, radiating fins;
15, a fan;
16, sealing the door;
17, a temperature buffer sleeve;
pb, pressure sensor.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model and the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
In a specific embodiment 1, as shown in fig. 1, 2, 3, 4 and 5, a liquid level constant apparatus includes an auxiliary apparatus and a temperature buffer jacket 17. The temperature buffer jacket 17 is separate from the auxiliary device and is not connected. The temperature buffer jacket 17 is used in conjunction with a test tube.
The auxiliary device comprises a sealing cover 1, an adsorption test cavity 2, a pressure regulating pipeline 3, a regulating valve 4 and a liquid level detection device.
Wherein, sealed lid 1 is provided with the through-hole, and pressure regulating pipeline 3 sets up on sealed lid 1's annular surface, and governing valve 4 sets up on pressure regulating pipeline 3.
In this embodiment, the liquid level detecting device includes a blank tube 5 and a pressure gauge Pb, the blank tube 5 is disposed in the adsorption test chamber 2, and the pressure gauge Pb is connected to and measures the pressure of the blank tube 5.
The embodiment is applied to a temperature control medium storage device, such as a dewar.
In this embodiment, the temperature buffer jacket 17 is made of porous PP material. The temperature buffer sleeve 17 is in a cuboid or cylinder shape, a circular through hole for inserting the pipe body of the test pipe is arranged in the temperature buffer sleeve, and the external structure is in a cuboid or cylinder shape.
The application process of this embodiment is as follows:
the sealing cover 1 is in sealing connection with the temperature control medium storage device, the bottom of the adsorption test cavity 2 is immersed in the temperature control medium, the outer wall of the adsorption test cavity 2 and the inner wall of the temperature control medium storage device form an annular sealing cavity, and the pressure in the sealing cavity is the same as the pressure of the liquid level of the adsorption test cavity 2. The temperature buffer sleeve 17 is sleeved on the test tube and then is placed in the adsorption test cavity 2 together, the bottom of the test tube is immersed in the temperature control medium, a part of the temperature buffer sleeve 17 is positioned above the temperature control medium, the temperature buffer sleeve 17 adsorbs part of the temperature control medium in the test tube through the capillary action of the porous PP material, when the temperature control medium volatilizes, the liquid level of the adsorption test cavity 2 is lowered, the pressure balance is broken, the pressure of the sealing cavity is higher than the liquid level of the adsorption test cavity 2 at the moment, the liquid level of the adsorption test cavity 2 rises until the pressure balance is restored, and in order to maintain the constant volume of the second free space, the liquid level of the adsorption test cavity 2 is ensured to be unchanged. Meanwhile, as part of temperature control medium exists in the temperature buffer sleeve 17, even if the temperature control medium volatilizes, the temperature control medium in the temperature buffer sleeve cannot disappear immediately, a temperature change buffer area is formed around the test tube due to the existence of the temperature buffer sleeve 17, and the adsorption environment temperature cannot change obviously due to the volatilization of the temperature control medium, so that the adsorption experiment cannot be influenced.
In this embodiment, the method for detecting the liquid level in the adsorption test chamber 2 is as follows:
when physical adsorption test is carried out, the blank tube 5 is filled with gas (such as helium) which is difficult to condense and has a certain pressure, the bottom is immersed in a temperature control medium, the pressure gauge Pb measures the pressure in the blank tube 5 in real time, when the temperature control medium volatilizes, the liquid level drops, the length of the part of the blank tube 5 body immersed in the temperature control medium changes, and then the internal temperature changes, and finally the pressure changes.
When the liquid level rises to the original height, the reading of the pressure gauge Pb is restored to the original state, and the regulating valve 4 is closed at this time.
In this embodiment, the pressure mode of adjusting the seal cavity is divided into pressure increasing and pressure decreasing.
When the pressure is increased, the pressure regulating pipeline 3 is connected with an external air source, and after the regulating valve 4 and the external air source are opened, the external air slowly enters the sealing cavity, so that the pressure of the sealing cavity is increased, and the liquid level in the adsorption test cavity 2 is increased.
When the pressure is reduced, the regulating valve 4 is opened, the gas in the sealed cavity slowly flows out through the pressure regulating pipeline 3, and the pressure is also reduced at any time, so that the liquid level in the adsorption test cavity 2 is reduced.
Example 2
In a preferred embodiment 2, as shown in fig. 4, 6 and 7, a liquid level constant apparatus includes an auxiliary device and a temperature buffer jacket 17. The temperature buffer jacket 17 is separate from the auxiliary device and is not connected. The temperature buffer jacket 17 is used in conjunction with a test tube.
The auxiliary device comprises a sealing cover 1, an adsorption test cavity 2, a pressure regulating pipeline 3, a regulating valve 4 and a liquid level detection device;
wherein, sealed lid 1 is provided with the through-hole, and liquid level detection device sets up in the through-hole, and pressure regulating pipeline 3 sets up on sealed lid 1's annular surface, and governing valve 4 sets up on pressure regulating pipeline 3.
In this embodiment, the liquid level detecting device is a liquid level meter 7.
The embodiment is applied to a temperature control medium storage device, such as a dewar.
In this embodiment, the temperature buffer jacket 17 is made of porous PE material. The temperature buffer sleeve 17 is in a cuboid or cylinder shape, a circular through hole for inserting the pipe body of the test pipe is arranged in the temperature buffer sleeve, and the external structure is in a cuboid or cylinder shape.
In this embodiment, the liquid level meter 7 is disposed above the temperature control medium in the adsorption test chamber 2, and is used for detecting the liquid level in the adsorption test chamber 2 in real time.
The application process of this embodiment is as follows:
the sealing cover 1 is in sealing connection with the temperature control medium storage device, the bottom of the adsorption test cavity 2 is immersed in the temperature control medium, an annular sealing cavity is formed by the outer wall of the adsorption test cavity 2 and the inner wall of the temperature control medium storage device, the pressure in the sealing cavity is the same as the pressure of the liquid level of the adsorption test cavity 2, the temperature buffer sleeve 17 is sleeved on the test tube and then is placed in the adsorption test cavity 2, the bottom of the test tube is immersed in the temperature control medium, a part of the temperature buffer sleeve 17 is positioned above the temperature control medium, and the temperature buffer sleeve 17 adsorbs the part of the temperature control medium through capillary action of the porous PP material. When the temperature control medium volatilizes, the liquid level of the adsorption test cavity 2 is reduced, the pressure balance is broken, the pressure of the sealing cavity is larger than the liquid level pressure of the adsorption test cavity 2, the liquid level of the adsorption test cavity 2 is increased until the pressure balance is recovered, the liquid level of the adsorption test cavity 2 is ensured to be unchanged in order to maintain the second free space volume, in this embodiment, the liquid level in the adsorption test cavity 2 is detected in real time through the liquid level meter 7, and the pressure of the sealing cavity is regulated through the regulating valve 4 and the pressure regulating pipeline 3. And then the liquid level of the adsorption test chamber 2 is adjusted to be kept unchanged, so that the second free space value is ensured to be constant. Meanwhile, as part of temperature control medium exists in the temperature buffer sleeve 17, even if the temperature control medium volatilizes, the temperature control medium in the temperature buffer sleeve cannot disappear immediately, a temperature change buffer area is formed around the test tube due to the existence of the temperature buffer sleeve 17, and the adsorption environment temperature cannot change obviously due to the volatilization of the temperature control medium, so that the adsorption experiment cannot be influenced.
In this embodiment, the pressure mode of adjusting the seal cavity is divided into pressure increasing and pressure decreasing.
When the pressure is increased, the pressure regulating pipeline 3 is connected with an external air source, and after the regulating valve 4 and the external air source are opened, the external air slowly enters the sealing cavity, so that the pressure of the sealing cavity is increased, and the liquid level in the adsorption test cavity 2 is increased.
When the pressure is reduced, the regulating valve 4 is opened, the gas in the sealed cavity slowly flows out through the pressure regulating pipeline 3, and the pressure is also reduced at any time, so that the liquid level in the adsorption test cavity 2 is reduced.
Example 3
In a preferred embodiment 3, as shown in fig. 8, a liquid level constant apparatus includes an auxiliary device and a temperature buffer jacket 17. The temperature buffer jacket 17 is separate from the auxiliary device and is not connected. The temperature buffer jacket 17 is used in conjunction with a test tube.
The auxiliary device comprises a sealing cover 1, an adsorption test cavity 2, a pressure regulating pipeline 3, a regulating valve 4 and a liquid level detection device; wherein, sealed lid 1 is provided with the through-hole, and liquid level detection device sets up in the through-hole, and pressure regulating pipeline 3 sets up on sealed lid 1's surface, and governing valve 4 sets up on pressure regulating pipeline 3.
In this embodiment, the liquid level detecting device is a liquid level meter 7.
The embodiment is applied to a temperature control medium storage device, such as a dewar.
In this embodiment, the temperature buffer jacket 17 is made of porous PE material.
In this embodiment, the liquid level meter 7 is disposed above the temperature control medium in the adsorption test chamber 2, and is used for detecting the liquid level in the adsorption test chamber 2 in real time.
In this embodiment, the device further comprises a sleeve 8; the sleeve 8 wraps the adsorption test cavity 2; the sleeve 8 is of porous material.
This embodiment relies on the structural implementation of embodiment 2 and is an optimization of embodiment 2.
In order to improve the accuracy of the test, in this embodiment, the adsorption test cavity 2 is wrapped with a layer of sleeve 8 made of porous material, the porous material and the temperature control medium are contacted to generate capillary phenomenon, the capillary force generated by the sleeve 8 can adsorb a part of the temperature control medium, and when the temperature control medium volatilizes and the liquid level is reduced, the adverse effect caused by the temperature difference change caused by the volatilization of the temperature control medium in the adsorption test cavity 2 can be reduced due to the adsorption of the temperature control medium in the sleeve 8, which is equivalent to the manufacture of another temperature buffer area. The embodiment effectively improves the accuracy of the test process.
The application procedure of this embodiment is the same as that of embodiment 2, and the principle is also the same as that of embodiment 2.
In a preferred embodiment, a pressure sensor 9 is also provided on the pressure regulating line 3.
The pressure sensor 9 is used for detecting the pressure of the sealed cavity in real time and calculating the height of the liquid level according to the pressure difference with the atmospheric pressure so as to judge whether the temperature control medium needs to be automatically or manually added.
Example 4
In a specific embodiment 4, as shown in fig. 9, a liquid level constant system comprises a test tube 10, a standard tube 11, a heat insulation shell 12, a temperature control medium storage device 6, an auxiliary device and a temperature buffer sleeve 17, a control host, wherein the standard tube 11 is arranged in the heat insulation shell 12, and the standard tube 11 is connected with the test tube 10 through a pipeline; the auxiliary device is connected with the temperature control medium storage device 6 in a sealing way; the temperature buffer sleeve 17 is sleeved on the test tube 10.
The control host controls the liquid level detection device and the regulating valve 4 in a communication line or wireless connection mode.
This embodiment is realized by the technical solution of embodiment 3.
As to how to calculate the first free space volume is common knowledge in the art, the core of the present embodiment is to add an auxiliary device for keeping the second free space volume constant. A temperature buffer jacket 17 is added to maintain the adsorption test environment temperature around the test tube 10. The method of maintaining the present example constant is identical to the method of example 3.
The control host in this embodiment is a control center of the adsorption test apparatus, which is not shown in the figure.
The test procedure of this example is as follows:
1. the adsorption apparatus is first started up, and the temperature of the standard tube 11 is kept constant at a target temperature, for example, 45 ℃;
2. vacuumizing the test tube 10 filled with the sample (at this time, the test tube 10 is not placed in the temperature control medium storage device 6), heating or refrigerating the radiating fin 14 through the semiconductor peltier 13, and diffusing heat or cold air into the sealing door 16 through the fan 15, so that the temperature of the test tube 10 is adjusted to be the same as that of the standard tube 11;
3, performing a first free space test on the test tube 10 at the target temperature, denoted as vfs_st;
4. raising the temperature control medium storage device 6 until the sample in the test tube 10 sleeved with the temperature buffer sleeve 17 is immersed in the temperature control medium, and fixing the position of the temperature control medium storage device 6 after a small part of the temperature buffer sleeve 17 is not immersed in the temperature control medium;
5. according to the liquid level obtained by the liquid level meter 7, the pressure of a sealing cavity formed by the outer wall of the adsorption test cavity 2 and the inner wall of the temperature control medium storage device 6 is regulated by the regulating valve 4, so that the liquid level is kept stable and unchanged.
6. After the pressure is stable, testing a second free space, and marking the second free space as Vfs_AT;
the effective free space Vfs of test tube 10 can be calculated from the values of vfs_st and vfs_at.
In step 6, the control host adjusts the liquid level in real time according to the liquid level change (by controlling the opening or closing of the regulating valve 4, the pressure in the sealed cavity is changed, thereby adjusting the liquid level of the adsorption test cavity 2).
The present embodiment has not been developed as to how to calculate the effective free space Vfs of the test tube 10 as is conventional in the art.
Example 5
In a preferred embodiment 5, as shown in fig. 10, a liquid level constant system comprises a test tube 10, a standard tube 11, a heat insulation shell 12, a temperature control medium storage device 6, an auxiliary device, a sealing door 16, a temperature buffer sleeve 17 and a control host, wherein the standard tube 11 is arranged in the heat insulation shell 12, the standard tube 11 is connected with the test tube 10 through a pipeline, and the auxiliary device is connected with the temperature control medium storage device 6 in a sealing way; the temperature buffer sleeve 17 is sleeved on the test tube 10.
The sealing door 16 is provided with a sealing connection between the temperature control medium storage device 6 and the heat preservation shell 12.
The control host controls the liquid level detection device and the regulating valve 4 in a communication line or wireless connection mode.
This embodiment is realized by the technical solution of embodiment 3. Is an optimization of example 4.
The sealing door 16 serves to isolate external moisture from entering the test area and condensing into ice, preventing it from affecting the test results.
Claims (8)
1. The liquid level constant device is characterized by comprising an auxiliary device and a temperature buffer sleeve;
the auxiliary device comprises a sealing cover, an adsorption test cavity, a pressure regulating pipeline, a regulating valve and a liquid level detection device;
the sealing cover is provided with a through hole, the pressure regulating pipeline is arranged on the surface of the sealing cover, the regulating valve is arranged on the pressure regulating pipeline, and the liquid level detection device is arranged in the adsorption test cavity or the through hole; the temperature buffer sleeve is arranged in the adsorption test cavity.
2. The liquid level constant device according to claim 1, wherein the temperature buffer sleeve is made of a heat-conducting material or a porous material.
3. A liquid level constancy apparatus as claimed in claim 1, wherein said liquid level detection means is selected from one of the group consisting of radar, level gauge, thermometer.
4. A liquid level constancy apparatus as claimed in claim 1, wherein said liquid level detection means comprises a blank tube and a pressure gauge;
the blank pipe is arranged in the adsorption test cavity, and the pressure gauge is connected with and measures the pressure of the blank pipe.
5. The fluid level constancy apparatus of claim 1, further comprising a sleeve;
the sleeve is arranged on the outer wall or the inner wall of the adsorption test cavity; the sleeve is a porous material.
6. The liquid level constancy apparatus of claim 1, wherein said pressure regulating conduit is further provided with a pressure sensor.
7. A liquid level constant system, comprising a test tube, a standard tube, a heat preservation shell, a temperature control medium storage device and a control host, wherein the standard tube is arranged in the heat preservation shell and is connected with the test tube through a pipeline;
the auxiliary device is connected with the temperature control medium storage device in a sealing way, and the temperature buffer sleeve is sleeved on the test tube;
the control host controls the liquid level detection device and the regulating valve in a communication line or wireless connection mode.
8. The system of claim 7, further comprising a sealing door configured to sealingly connect the temperature control medium storage device and the thermal enclosure.
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