Liquid level meter isolated from working medium

Abstract

The utility model discloses a liquid level meter isolated from a working medium, which relates to the field of liquid level meter structures, and comprises an inner pipe, an outer pipe, an outer pipe, an inner pipe, an outer pipe and an outer pipe, and is characterized in that one end of the inner pipe is communicated with the working medium in a container while the other end is communicated with a gas phase above the working medium in the container; a containing cavity is formed in the liquid level meter base, the inner pipe is communicated with the containing cavity, a diaphragm is arranged in the containing cavity, indicating liquid is arranged above the diaphragm, and the diaphragm is arranged to isolate the indicating liquid from the working medium; and the scale mechanism is used for measuring the height of the indicating liquid in the inner pipe. According to the liquid level meter, the liquid level meter base is arranged, the containing cavity is formed in the liquid level meter base, the diaphragm is arranged in the containing cavity to isolate the indicating liquid from the working medium, and therefore the purpose that the liquid level height of a container can be accurately monitored even though the indicating liquid is obviously used is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level meter structure field, concretely relates to a liquid level meter isolated with working medium. BACKGROUND

[0002] The current on-site liquid level meter is mostly straight-through type liquid level meter, that is, the liquid displayed in the liquid level meter is the working medium directly flowing from the liquid storage container. The straight-through type liquid level meter has the advantages of simple structure, convenient manufacturing and no need for calibration. However, it also has certain defects, such as the working medium directly used as display liquid in the straight-through type liquid level meter. If the working medium is colorless, such as some pure organic solvents or light-colored solution, it is difficult to clearly observe the change of liquid level in the transparent tube of the liquid level meter. When the liquid level meter is installed at a high position, the operator needs to look up to see the liquid level. Due to the limited viewing angle of the human eye when looking up, combined with the non-obvious display of colorless or light-colored liquid, the liquid level information displayed by the liquid level meter is more difficult to capture. Similarly, when observing at a distance, the resolution ability of the human eye to details decreases due to the increase of distance, and the subtle change of liquid level in the liquid level meter is difficult to be perceived.

[0003] If the freezing point of the working medium is relatively high, when the environmental temperature is lower than the freezing point, the medium in the display tube of the liquid level meter will freeze. The diameter of the transparent tube of the straight-through type liquid level meter is usually designed to be relatively large, in order to ensure that the liquid can smoothly flow in and out, and to avoid a large flow resistance caused by a too small tube diameter. However, the relatively large tube diameter also brings some problems. On the one hand, the relatively large tube diameter means that the wall thickness of the transparent tube is relatively thick, which will increase the refraction and scattering of light in the tube, affecting the clarity of liquid level display. On the other hand, the relatively large tube diameter makes the overall size of the liquid level meter larger, occupying more space, which may bring difficulties to installation and maintenance in some equipment installation environments with limited space.

[0004] Due to the relatively large diameter of the transparent tube, correspondingly, a larger amount of medium needs to be filled in the liquid level meter. This means that a larger amount of working medium will be stored in the liquid level meter during the operation of the equipment. These media, although in the liquid level meter, do not participate in the normal material circulation and reaction in the liquid storage container. In some chemical reaction devices with strict material quantity control requirements, the excess medium in the liquid level meter will occupy a certain amount of material space, affecting the accurate measurement of the reaction material. Moreover, if the medium in the liquid level meter leaks, due to the large filling amount, it may cause a large loss of material, and even may cause a safety accident.

[0005] In a chemical reaction device, the medium participating in the reaction needs to be constantly flowing and mixing to ensure the full progress of the reaction. However, the medium in the liquid level meter is almost not flowing. Because the main function of the liquid level meter is to display the liquid level, its internal structure and working principle determine that the flow of the medium therein is limited. These non-flowing media are like some "dead zones" that cannot fully participate in the reaction like other media in the liquid storage container. Moreover, the larger the capacity of the liquid level meter, the more medium that does not participate in the reaction.

[0006] In view of this, the present application is proposed. Invention content

[0007] The utility model discloses a kind of liquid level meters isolated from working medium, by setting liquid level meter seat, and setting containing chamber in liquid level meter seat, diaphragm is set in containing chamber, to isolate indicating liquid from working medium, to solve the problem of inconvenience and inaccurate display when using working medium as indicating fluid in prior art.

[0008] The utility model embodiment is realized by the following technical scheme: the utility model embodiment provides a kind of liquid level meters isolated from working medium, comprising:

[0009] Inner tube is set to one end and the working medium in container are communicated, and the other end is communicated with the gas above working medium in container;

[0010] Liquid level meter seat is internally provided with containing chamber, and inner tube is communicated containing chamber, and diaphragm is provided in containing chamber, and the upper portion of diaphragm is provided with indicating liquid, and diaphragm is set to isolate indicating liquid from working medium;

[0011] Scale mechanism is set to measure the height of indicating liquid in inner tube.

[0012] Optionally, the liquid level meter seat includes an upper flange and a lower flange, the upper flange is provided with an upper chamber, the lower end of the upper chamber is open, the lower flange is provided with a lower chamber, the upper end of the lower chamber is open, and the openings of the upper chamber and the lower chamber are in communication.

[0013] Optionally, a gasket is provided between the upper flange and the lower flange, and the gasket is configured to seal the communication between the upper chamber and the lower chamber.

[0014] Optionally, the gasket, the upper flange, and the lower flange together form a sealed containing chamber, and the size of the containing chamber can be adjusted.

[0015] Optionally, the diaphragm is connected to the opening of the lower chamber, the diaphragm is arranged in the lower chamber, and is arranged along the inner wall of the lower chamber.

[0016] Optionally, a plurality of bolt holes are provided on the upper flange and the lower flange, and the bolt holes are configured to allow bolts to connect the upper flange and the lower flange.

[0017] Optionally, the upper chamber is provided with a first exhaust mechanism, and the lower chamber is provided with a second exhaust mechanism, the first exhaust mechanism is configured to control exhaust of the upper chamber, and the second exhaust mechanism is configured to control exhaust of the lower chamber.

[0018] Optionally, the upper end of the inner tube is sleeved with an outer tube on one side, the outer tube is sealed at the bottom and open at the upper end, the outer tube is made of transparent material, and the outer tube is filled with transparent liquid, and the transparent liquid is located outside the inner tube.

[0019] Optionally, the lower end of the inner tube is sleeved with a sleeve on one side, the sleeve is provided with a fluid inlet, the fluid inlet is configured to deliver external fluid between the sleeve and the inner tube, and the external fluid is configured to exchange heat with the working medium in the inner tube.

[0020] Optionally, the upper chamber and the lower chamber are symmetrically arranged in an upper and lower direction, and are both cylindrical structures, the cross-sectional area of the upper chamber or the lower chamber is S1, the cross-sectional area of the inner tube is S2, and 60S2<S1<70S2.

[0021] Compared with the prior art, the embodiments of the present application have the following advantages and beneficial effects:

[0022] 1. The liquid level meter isolated from the working medium provided by the embodiments of the present application comprises a liquid level meter seat, a containing chamber is arranged in the liquid level meter seat, and a diaphragm is arranged in the containing chamber, so that the indicating liquid is completely isolated from the working medium, the indicating liquid can be selected as colored liquid, which does not solidify and does not volatilize at normal temperature, is convenient for observation and measurement, and is located above the diaphragm, the indicating liquid is in gas phase communication with the working medium in the container through the inner tube, when the liquid level changes, the height of the indicating liquid also changes, so as to indicate the height of the working liquid in the container. In the embodiments of the present application, the indicating liquid is isolated from the working medium in liquid phase, the pollution and interference of the working medium on the indicating liquid are prevented, the influence of the indicating liquid on the working medium is also prevented, and the accuracy and reliability of the liquid level display are ensured.

[0023] 2. The embodiments of the present application set the liquid level meter seat to comprise an upper flange and a lower flange, set an upper chamber on the upper flange, set a lower chamber on the lower flange, combine the upper chamber and the lower chamber, form a sealed containing chamber, ensure that the working medium and the indicating liquid form a communicating vessel in the liquid level meter seat, and realize isolation through the diaphragm.

[0024] 3. The utility model discloses a flange, gasket, upper flange and lower flange jointly form the sealed containing chamber, can replace the thickness of gasket according to actual demand, and the size of containing chamber can be adjusted through replacing the gasket of different thickness, increase the flexibility and adaptability of liquid level meter, can satisfy the liquid level measurement demand of different container, different height.

[0025] Generally, the utility model discloses an embodiment of liquid level meter isolated with working medium, through setting liquid level meter seat, and setting containing chamber in liquid level meter seat, setting diaphragm in containing chamber, the indicating liquid is isolated with working medium, to reach the purpose of using obvious indicating liquid also can accurate monitoring container liquid level height. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be needed to use the drawings in the embodiment briefly introduced, should understand, the following drawings only shows some certain embodiments of the utility model, therefore should not be seen as the limited scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, also can obtain other related drawings according to these drawings.

[0027] Figure 1 The liquid level meter working connection structure schematic diagram provided for the utility model embodiment shows that

[0028] Figure 2 The liquid level meter structure schematic diagram provided for the utility model embodiment shows that

[0029] Figure 3 For Figure 1 The structure enlarged view of A in the middle shows that

[0030] Figure 4 For Figure 1 The structure enlarged view of B in the middle shows.

[0031] Mark and corresponding component name in the drawings:

[0032] 1-inner tube, 2-container, 3-liquid level meter seat, 4-diaphragm, 5-upper flange, 6-lower flange, 7-gasket, 8-upper chamber, 9-lower chamber, 10-bolt hole, 11-first exhaust mechanism, 12-second exhaust mechanism, 13-outer tube, 14-sleeve, 15-fluid inlet, 16-first pagoda nozzle, 17-second pagoda nozzle, 18-scale, 19-working medium, 20-communication valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0037] Embodiments

[0038] As Figure 1 shown, the embodiments of the present application provide a liquid level meter isolated from working medium, comprising: an inner tube 1, arranged to communicate with the working medium 19 in the container 2 at one end, and to communicate with the gas above the working medium 19 in the container 2 at the other end, to ensure that the pressure in the inner tube 1 is balanced with the pressure in the container 2, to avoid measurement error caused by pressure difference, and at the same time, the inner tube 1 can be arranged of transparent material, to facilitate observation and reading of the scale; a liquid level meter seat 3, having an accommodation chamber arranged inside, the inner tube 1 communicating with the accommodation chamber, a diaphragm 4 arranged inside the accommodation chamber, an indicating liquid arranged above the diaphragm 4, the diaphragm 4 arranged to isolate the indicating liquid from the working medium 19; a scale mechanism arranged to measure the height of the indicating liquid in the inner tube 1, exemplarily, the scale mechanism can be a scale 18 separately installed on the liquid level meter seat 3, or a scale arranged on the outer wall of the inner tube 1, which is not limited here.

[0039] In use, the inner tube 1 communicates with the containing chamber of the liquid level gauge seat 3, the working medium 19 enters the containing chamber through the inner tube 1, but is isolated by the diaphragm 4, which can prevent the working medium 19 from polluting and interfering with the indicating liquid, and also prevent the indicating liquid from affecting the working medium 19, ensuring the accuracy and reliability of the liquid level display. The indicating liquid is used to display the liquid level, and can be selected to be colored, non-solidified and non-volatile at room temperature, which can facilitate observation and measurement. The indicating liquid is located above the diaphragm 4 and forms a communication device with the working medium 19 in the container 2 through the inner tube 1. When the liquid level changes, the height of the indicating liquid also changes. The scale 18 is fixed on the liquid level gauge seat 3 or the container 2 and is parallel to the inner tube 1, which is used to directly read the height of the indicating liquid. When the liquid level of the working medium 19 in the container 2 changes, the height of the indicating liquid changes, and the change in the height of the indicating liquid is proportional to the change in the liquid level of the working medium 19. This structure effectively solves the problem of inconvenience and inaccurate display when using the working medium 19 as the indicating fluid in the prior art, and provides a more accurate, reliable and safe liquid level measurement solution.

[0040] It should be noted that the material of the inner tube 1 above the liquid level gauge seat 3 and the material of the inner tube 1 below the liquid level gauge seat 3 can be the same or different, and is preferably transparent, such as glass or plastic, since the inner tube 1 above the liquid level gauge seat 3 needs to observe the liquid level of the indicating liquid. Since the inner tube 1 below the liquid level gauge seat 3 is mainly filled with working medium, which is generally highly corrosive, it can be made of stainless steel. Of course, in other embodiments, the material of the inner tube 1 above the liquid level gauge seat 3 and the material of the inner tube 1 below the liquid level gauge seat 3 can both be glass, which is not limited here and can be set according to the different working medium. It should also be noted that the liquid level gauge seat 3 above and below is in communication with the inner tube 1, and the connection method can be integral, welding, bolt connection, etc., which is not limited here as long as it can achieve sufficient connection stability and sealing performance. At the same time, the inner tube 1 below the liquid level gauge seat 3 and the container 2 can be evaluated according to the safety of the working medium, and a switch valve can be added if necessary, which is not limited here.

[0041] Exemplarily, as Figure 2 and Figure 3As shown, the liquid level meter seat 3 comprises an upper flange 5 and a lower flange 6, the upper flange 5 is provided with an upper chamber 8, the lower end of the upper chamber 8 is open, the lower flange 6 is provided with a lower chamber 9, the upper end of the lower chamber 9 is open, and the opening of the upper chamber 8 is in communication with the opening of the lower chamber 9. The structure can ensure that the working medium 19 and the indicating liquid form a communicating vessel in the liquid level meter seat 3, and is isolated by the diaphragm 4. As a preferred embodiment of the utility model, the gasket 7 is arranged between the upper flange 5 and the lower flange 6, the gasket 7 is arranged to seal the communication between the upper chamber 8 and the lower chamber 9, the gasket, the upper flange 5 and the lower flange 6 jointly form a sealed containing chamber, and the size of the containing chamber can be adjusted. Preferably, the inner surfaces of the upper chamber 8 and the lower chamber 9 can be provided as smooth surfaces, and the corners can be provided with round corners, so that the inner surfaces of the upper chamber 8 and the lower chamber 9 have no sharp edges and burrs, and the diaphragm 4 will not be scratched.

[0042] Specifically, the gasket 7 is arranged between the upper flange 5 and the lower flange 6, the gasket 7, the upper flange 5 and the lower flange 6 jointly form a sealed containing chamber, and the size of the containing chamber can be adjusted by replacing gaskets 7 of different thicknesses, thereby adjusting the volume of the indicating liquid of the liquid level meter. The structure increases the flexibility and adaptability of the liquid level meter, and can meet the liquid level measurement requirements under different working conditions. More preferably, the diaphragm 4 is connected at the opening of the lower chamber 9, the diaphragm 4 is arranged in the lower chamber 9, and is arranged along the inner wall of the lower chamber 9. The structure can ensure that the diaphragm 4 has the maximum range of movement without plastic deformation. When the liquid level of the working medium 19 in the container 2 changes, the working medium 19 enters the containing chamber through the inner tube 1, pushes the diaphragm 4 to move up and down, and ensures that the diaphragm 4 has a more flexible range of movement without plastic deformation, thereby ensuring that the height of the indicating liquid can accurately reflect the change of the liquid level of the working medium 19 when the liquid level changes.

[0043] Exemplarily, the cross-sectional area of the inner tube 1 on the liquid level meter seat 3 is S2, the highest liquid level of the indicating liquid is H1, and the effective volume is H1S2. The utility model embodiment sets the volume of the sealed containing chamber formed by the gasket 7, the upper flange 5 and the lower flange 6 to be greater than or equal to 1.2 times the effective volume, so as to ensure that the liquid level meter can accurately display under different liquid level changes, and avoid measurement errors caused by insufficient volume of the containing chamber. It should be noted that the diaphragm 4 can be made of polytetrafluoroethylene material, of course, in other embodiments, the diaphragm 4 can also be made of other flexible materials, as long as it can meet the sufficient flexibility, preferably, the diaphragm 4 also needs to meet the corrosion resistance and temperature resistance of the working medium. It should be noted that in order to improve the isolation effect and sealing effect of the diaphragm, the outer edge of the diaphragm 4 can be arranged to extend to the outer edge of the gasket 7. Exemplarily, the diaphragm 4 of the utility model embodiment is arranged in a circular shape, and the gasket 7 is arranged in an annular shape, and the outer ring diameter of the gasket 7 is smaller than the diameter of the diaphragm 4.

[0044] In order to improve the connection sealing and stability of the upper chamber 8 and the lower chamber 9, a plurality of communicating bolt holes 10 can be provided on the upper flange 5 and the lower flange 6, and the bolt holes 10 are arranged to allow the bolts to connect the upper flange 5 and the lower flange 6. The position and size of these bolt holes 10 are completely matched, which ensures that the bolts can smoothly pass through and connect the two flanges. By tightening the bolts, the sealing between the upper flange 5 and the lower flange 6 can be ensured to prevent liquid leakage. The arrangement of the bolt holes 10 makes the installation process of the liquid level meter simple and fast. Only by aligning the upper flange 5 and the lower flange 6, inserting the bolts and tightening, the installation can be completed. When it is necessary to maintain or replace the diaphragm 4, gasket 7 and other components, only by loosening the bolts, the upper flange 5 can be easily disassembled for replacement and maintenance of internal parts. It should be noted that the number of bolt holes 10 is not limited here and can be set according to actual needs. Generally speaking, the more the number of connected bolt structures, the stronger the connection stability.

[0045] As a preferred embodiment of the present application, the upper chamber 8 is provided with a first exhaust mechanism 11, and the lower chamber 9 is provided with a second exhaust mechanism 12. The first exhaust mechanism 11 is arranged to control the exhaust of the upper chamber 8, and the second exhaust mechanism 12 is arranged to control the exhaust of the lower chamber 9. It should be noted that the first exhaust mechanism 11 and the second exhaust mechanism 12 can each be a simple exhaust valve or exhaust hole, which is controlled manually or automatically for the first use to exhaust, improve the accuracy of the device, and also can be used for liquid filling and flushing pipeline. For example, the first exhaust mechanism 11 and the second exhaust mechanism 12 can include an exhaust hole and a good sealing performance plug such as NPT 1 / 16 hexagonal plug.

[0046] Further, the upper end of the inner tube 1 is sleeved with an outer tube 13, the bottom of the outer tube 13 is sealed and the upper end is open, the outer tube 13 is made of transparent material, the outer tube 13 contains transparent liquid, and the transparent liquid is located outside the inner tube 1. Specifically, as shown in Figure 4 the bottom of the outer tube 13 is sealed and the upper end is open, and the outer tube 13 is made of transparent material to ensure that the liquid level indication is clear and visible. The height of the outer tube 13 is slightly greater than the highest display liquid level of the container, and the outer tube 13 can be arranged on the liquid level meter seat 3 or directly hung on the outside of the inner tube 1. The outer tube 13 contains transparent liquid, and the transparent liquid is located outside the inner tube 1. The transparent liquid amplifies the display of the liquid level in the inner tube 1 to make the liquid level display clearer, which is convenient for the operator to observe the liquid level from a distance or different angles. The selection of the transparent liquid ensures that the liquid in the outer tube 13 will not interfere with the display of the indicating liquid. For example, the transparent liquid here can be water. Preferably, a communication valve 20 can be arranged above the inner tube 1 to control the communication between the inner tube 1 and the gas phase in the container 2. The communication valve 20 is manually or automatically controlled to ensure that the pressure in the inner tube 1 is balanced with the gas phase pressure in the container 2.

[0047] In order to avoid the freezing of the working medium 19 below the inner tube 1, a sleeve 14 can be sleeved on the lower end of the inner tube 1, and a fluid inlet 15 is arranged on the sleeve 14, which is arranged to deliver external fluid between the sleeve 14 and the inner tube 1, and the external fluid is arranged to exchange heat with the working medium 19 in the inner tube 1, so that the working medium 19 in the inner tube 1 always remains in a liquid state. Of course, it can also be ensured that the working medium 19 maintains a proper temperature in the liquid level meter, avoiding measurement errors caused by temperature changes. It should be noted that the external fluid can be water, steam, heat conducting oil, etc. The fluid inlet 15 can be arranged in a lotus mouth manner to facilitate connection with a device for providing external fluid. Similarly, the connecting end of the liquid level meter seat 3 and the inner tube 1 can also be provided with a first lotus mouth 16, and the connecting end of the liquid level meter seat 3 and the outer tube 13 can also be provided with a second lotus mouth 17.

[0048] Preferably, the upper chamber 8 and the lower chamber 9 are arranged symmetrically up and down, and are both cylindrical structures. The cross-sectional area of the upper chamber 8 or the lower chamber 9 is S1, the cross-sectional area of the inner tube 1 is S2, 60S2<S1<70S2, and preferably S1=70S2. In this way, the pressure difference generated by the diaphragm 4 can be ignored, and at the same time, the purpose of setting a smaller pipe diameter of the inner tube 1 can be achieved.

[0049] It should be noted that the scale 18 can be calibrated at the medium working temperature to avoid errors caused by the inconsistency between the density of the indicating liquid and the density of the medium, and the first exhaust mechanism 11 can be used to adjust the 0 scale. The liquid level meter provided by the embodiment of the utility model stays in the working medium 19 in the inner tube 1, which greatly reduces the influence of the liquid level meter on the reaction result of the container 2. There is no pressure difference between the upper and lower diaphragms 4, which can be made into a thin film structure to further reduce the influence of the diaphragm 4 itself on the liquid level.

[0050] It should be further noted that the display liquid is different from the working medium 19 in the container 2, and the density thereof can also be set to be different, and the display scale can be calibrated respectively according to the different working medium 19, and the corresponding scale can be replaced during use. Specifically, the setting of the indicating liquid is not limited to the flexible adjustment of the color, and the density thereof can also be adjusted. The operator does not need to deliberately pursue the setting of the indicating liquid to be consistent with the density of the working medium. When the density of the indicating liquid is different from that of the working medium, accurate display of the liquid level can be realized through calibration. If the density of the indicating liquid is greater than that of the working medium, the volume of the indicating liquid can be set to be smaller.

[0051] The liquid level meter is not limited to on-site display, and can also adopt optical signal remote display and be used for automatic control.

[0052] Exemplarily, when the inner diameter of the inner tube 1 is 3mm and the liquid level height is 700mm, the volume of the working medium in the inner tube 1 is about equal to 5ml, which greatly reduces the influence of the liquid level meter on the reaction result in the prior art.

[0053] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, and for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model. It should be noted that the structure or component illustrated in the drawings is not necessarily drawn according to scale, and the utility model omits the description of the known components and processing technology and process, so as to avoid unnecessary limitation of the utility model.

Claims

1. A level gauge isolated from the working medium, characterized in that, include: The inner tube (1) is configured such that one end is connected to the working medium inside the container (2), and the other end is connected to the air above the working medium inside the container (2). A level gauge base (3) has an internal accommodating chamber. The inner tube (1) is connected to the accommodating chamber. A diaphragm (4) is provided inside the accommodating chamber. An indicating liquid is provided above the diaphragm (4). The diaphragm (4) is configured to isolate the indicating liquid from the working medium. The scale mechanism is configured to measure the height of the indicated liquid inside the inner tube (1).

2. The level gauge isolated from the working medium according to claim 1, characterized in that, The level gauge base (3) includes an upper flange (5) and a lower flange (6). An upper chamber (8) is provided on the upper flange (5), and the lower end of the upper chamber (8) is open. A lower chamber (9) is provided on the lower flange (6), and the upper end of the lower chamber (9) is open. The upper chamber (8) and the lower chamber (9) are connected.

3. A level gauge isolated from the working medium according to claim 2, characterized in that, A gasket (7) is provided between the upper flange (5) and the lower flange (6), and the gasket (7) is configured to seal the connection between the upper chamber (8) and the lower chamber (9).

4. A level gauge isolated from the working medium according to claim 3, characterized in that, The gasket (7), upper flange (5), and lower flange (6) together form a sealed receiving chamber, the size of which is adjustable.

5. A level gauge isolated from the working medium according to claim 3, characterized in that, The diaphragm (4) is connected to the opening of the lower chamber (9). The diaphragm (4) is disposed inside the lower chamber (9) and is attached to the inner wall of the lower chamber (9).

6. A level gauge isolated from the working medium according to claim 5, characterized in that, The upper flange (5) and the lower flange (6) are provided with a plurality of interconnected bolt holes (10), which are configured to allow bolts to connect the upper flange (5) and the lower flange (6).

7. A level gauge isolated from the working medium according to claim 2, characterized in that, The upper chamber (8) is connected to a first exhaust mechanism (11), and the lower chamber (9) is connected to a second exhaust mechanism (12). The first exhaust mechanism (11) is configured to control the exhaust of the upper chamber (8), and the second exhaust mechanism (12) is configured to control the exhaust of the lower chamber (9).

8. A level gauge isolated from the working medium according to claim 1, characterized in that, An outer tube (13) is fitted onto one side of the upper end of the inner tube (1). The bottom of the outer tube (13) is sealed and the upper end is open. The outer tube (13) is made of transparent material and contains a transparent liquid. The transparent liquid is located outside the inner tube (1).

9. A level gauge isolated from the working medium according to claim 1, characterized in that, A sleeve (14) is fitted on one side of the lower end of the inner tube (1). A feed inlet (15) is provided on the sleeve (14). The fluid inlet (15) is configured to transport external fluid to the space between the sleeve (14) and the inner tube (1). The external fluid is configured to perform heat exchange on the working medium in the inner tube (1).

10. A level gauge isolated from the working medium according to claim 2, characterized in that, The upper chamber (8) and the lower chamber (9) are arranged symmetrically, and both are cylindrical structures. The cross-sectional area of ​​the upper chamber (8) or the lower chamber (9) is S1, and the cross-sectional area of ​​the inner tube (1) is S2. <S1<70S2。

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