Dry gas generating device

Abstract

The utility model provides a dry gas generating device which comprises a buffer tank connected with a compressor, gas to be dried is introduced into an inlet of the buffer tank, and compressed gas is output from an outlet of the buffer tank; the first dewatering and filtering assembly is used for receiving the compressed gas output by the buffer tank, performing primary filtering on moisture in the compressed gas and outputting the compressed gas; the molecular sieve column group is used for receiving the primarily filtered gas output by the first dewatering and filtering assembly, absorbing moisture in the primarily filtered gas and outputting dehumidified gas; and the second dewatering and filtering assembly is used for receiving the dehumidified gas, performing secondary filtering on moisture in the dehumidified gas and then outputting dry gas, and the dry gas is exhausted through an exhaust outlet. According to the scheme, the dry gas can be continuously provided on line, continuous and stable operation can be achieved, and the convenience of dry gas supply is improved.

Description

Technical Field

[0001] The utility model relates to the field of gas processing, in particular to a dry gas generating device. Background Art

[0002] In scientific research, instrumentation, and other fields, dry gases with dew points of -60°C or even lower are often required for instrument purging or sample drying. These gases are typically prepared using large-scale industrial equipment and stored in gas cylinders, which are then transported to the laboratory for use. Due to the limited storage capacity of these cylinders, they must be replaced regularly, making their use cumbersome. Summary of the Invention

[0003] The technical problem to be solved by the utility model is that the prior art uses steel cylinders to store dry gas, which brings cumbersome replacement steps to the test process, and thus provides a dry gas generating device.

[0004] The technical solution of this application provides a dry gas generating device, comprising:

[0005] A buffer tank is connected to a compressor, wherein the inlet of the buffer tank receives the gas to be dried and the outlet outputs the compressed gas;

[0006] a first water removal and filtering component, receiving the compressed gas outputted from the buffer tank, and filtering the water in the compressed gas before outputting it;

[0007] a molecular sieve column group, receiving the first-stage filtered gas output by the first water removal filter assembly and absorbing the moisture therein to output dehumidified gas;

[0008] The second dehumidification filter assembly receives the dehumidified gas, performs secondary filtration on the moisture in the dehumidified gas, and then outputs dry gas, which is discharged through the exhaust outlet.

[0009] In some embodiments of the dry gas generating device, the first water removal and filtration assembly includes:

[0010] The filter has a drain valve disposed at its drain outlet, and the drain valve is connected to the drain outlet.

[0011] In some embodiments of the dry gas generating device, the first water removal filter assembly includes three filters, which are connected in sequence.

[0012] In some embodiments of the dry gas generating device, a buffer tank valve is provided at the bottom of the buffer tank, and the buffer tank valve is connected to a drain outlet.

[0013] The dry gas generating device described in some embodiments further includes:

[0014] A pressure switch is provided between the compressor and the buffer tank, and opens when the gas pressure in the buffer tank reaches a set value.

[0015] In some embodiments of the dry gas generating device, the molecular sieve column group includes a first molecular sieve column and a second molecular sieve column connected in parallel, a first three-way valve, a second three-way valve, a first on-off valve, a second on-off valve, and a flow regulating valve;

[0016] The inlet of the first molecular sieve column is connected to the first port of the first three-way valve and the first port of the first switch valve; the outlet of the first molecular sieve column is connected to the first port of the second three-way valve and the first port of the flow regulating valve;

[0017] The inlet of the second molecular sieve column is connected to the second port of the first three-way valve and the first port of the second switch valve; the outlet of the second molecular sieve column is connected to the second end of the second three-way valve and the second port of the flow regulating valve.

[0018] In some embodiments of the dry gas generating device, the first three-way valve, the second three-way valve, the first on-off valve, and the second on-off valve are driven to a connected state according to a set cycle using electromagnetic coils or compressed gas.

[0019] The dry gas generating device described in some embodiments further includes a pressure reducing valve and a pressure gauge:

[0020] The inlet of the pressure reducing valve is connected to the third port of the second three-way valve, and the outlet of the pressure reducing valve is connected to the exhaust outlet;

[0021] The pressure gauge is arranged between the outlet of the pressure reducing valve and the exhaust outlet.

[0022] In some embodiments of the dry gas generating device, the second water removal filter assembly is a filter, a drain valve is provided at the drain outlet of the filter, and the drain valve is connected to the drain outlet.

[0023] In some embodiments of the dry gas generating device, each drain valve is an automatic drain valve that opens when the moisture in the filter reaches a set amount.

[0024] Compared with the prior art, the above technical solution of the present application has at least the following beneficial effects:

[0025] The dry gas generating device provided by the present application, the buffer tank and the compressor cooperate to keep the pressure in the buffer tank within a certain range, and the dry gas can be preliminarily dried after being compressed. The gas output from the buffer tank is again filtered through the first level of the first water removal filter component, dehumidified by the molecular sieve column group, and filtered at the second level of the second water removal filter component to obtain dry gas for discharge. Combined with the preliminary drying in the buffer tank, the device of the present application performs a four-stage drying process on the gas to be dried, which includes a drying process of the molecular sieve column group, and can obtain dry gas with a dew point below -60°C, replacing gas cylinders, and no longer needing to replace cylinders, etc. The device can continuously provide dry gas online, can operate continuously and stably, and improves the convenience of dry gas supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a dry gas generating device according to an embodiment of the present application;

[0027] Figure 2 This is a schematic structural diagram of a dry gas generating device according to another embodiment of the present application;

[0028] The meanings of the reference numerals are as follows:

[0029] 1-buffer tank, 2-compressor, 3-first water removal filter assembly, 4-molecular sieve column group, 5-second water removal filter assembly, 6-exhaust outlet, 7-pressure reducing valve, 8-pressure gauge 8, 11-pressure switch, 12-buffer tank valve, 100-drain outlet;

[0030] 31-first filter, 32-second filter, 33-third filter, 310-first drain valve, 320-second drain valve, 330-third drain valve, 41-first molecular sieve column, 42-second molecular sieve column, 43-first three-way valve, 44-second three-way valve, 45-first switch valve, 46-second switch valve, 47-flow regulating valve, 51-fourth drain valve. DETAILED DESCRIPTION

[0031] The specific implementation of this application is further described below with reference to the accompanying drawings.

[0032] It is easy to understand that according to the technical solution of this application, a variety of structural methods and implementation methods can be replaced with each other by those skilled in the art without changing the essential spirit of this application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of this application and should not be regarded as the entire application or as a limitation or restriction of the technical solution of the application.

[0033] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly mentioned in this specification are defined relative to the structure shown in the drawings. They are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0034] The embodiment of the present application provides a dry gas generating device, such as Figure 1 As shown, it includes a buffer tank 1, a compressor 2, a first dehydration filter component 3, a molecular sieve column group 4, a second dehydration filter component 5, and an exhaust outlet 6. The buffer tank 1 is connected to the compressor 2, the inlet of the buffer tank 1 is connected to the gas to be dried, and the outlet outputs the compressed gas; the first dehydration filter component 3 receives the compressed gas output by the buffer tank 1, and performs a first-stage filtration on the moisture in the compressed gas before outputting it; the molecular sieve column group 4 receives the first-stage filtered gas output by the first dehydration filter component 3 and absorbs the moisture therein before outputting the dehumidified gas; the second dehydration filter component 5 receives the dehumidified gas, performs a second-stage filtration on the moisture in the dehumidified gas before outputting the dry gas, and the dry gas is discharged through the exhaust outlet 6. As the name suggests, the molecular sieve column group 4 is a molecular sieve material placed in a column container. The molecular sieve material is well known to those skilled in the art, that is, an artificially synthesized hydrated aluminosilicate (zeolite) or natural zeolite with the function of screening molecules. Its structure consists of numerous channels with uniform pore sizes and neatly arranged pores. Molecular sieves of different pore sizes separate molecules of different sizes and shapes. It has high adsorption capacity, strong selectivity, and high temperature resistance, making it an excellent adsorbent for gas dehydration.

[0035] In the above solution provided by this embodiment, the buffer tank 1 cooperates with the compressor 2 to keep the pressure in the buffer tank 1 within a certain range, and the dry gas can be initially dried after being compressed. The gas output from the buffer tank 1 is again filtered through the first level of the first water removal filter component 3, dehumidified by the molecular sieve column group 4, and filtered at the second level of the second water removal filter component 5 to obtain dry gas for discharge. Combined with the preliminary drying of the buffer tank 1, the present device performs a four-stage drying process on the gas to be dried, which includes a drying process of the molecular sieve column group 4, and can obtain dry gas with a dew point below -60°C, replacing gas cylinders, and no longer requiring replacement of cylinders, etc. The device can continuously provide dry gas online, can operate continuously and stably, and improves the convenience of dry gas supply.

[0036] Furthermore, in the dry gas generating device, the first water removal filter assembly 3 includes a filter, and a drain valve is provided at the drain outlet of the filter, and the drain valve is connected to the drain outlet. Figure 2As shown, the first dewatering filter assembly 3 includes three filters, which are connected in sequence. That is, the first dewatering filter assembly 3 includes a first filter 31, a second filter 32, and a third filter 33. The three filters are respectively equipped with three drain valves, namely, a first drain valve 310, a second drain valve 320, and a third drain valve 330, and all three drain valves are connected to the drain port 100. Through the solution of this application, the three filters connected in sequence can effectively filter moisture in the gas. In specific implementation, the number of filters can be adjusted according to the space size of the laboratory.

[0037] Similarly, the second water removal filter assembly 5 is a filter, and a drain valve is provided at the drain outlet of the filter, such as the fourth drain valve 51 shown in the figure, which is connected to the drain outlet 100. In the above solution, each of the drain valves is an automatic drain valve that opens when the water content in the filter reaches a set water volume.

[0038] In some embodiments, the dry gas generating device further includes a pressure switch 11, which is disposed between the compressor 2 and the buffer tank 1. The pressure switch 11 opens when the gas pressure in the buffer tank 1 reaches a set value. This embodiment enables automatic control of the gas pressure in the buffer tank 1.

[0039] Preferably, in the dry gas generating device, a buffer tank valve 12 is provided at the bottom of the buffer tank 1, and the buffer tank valve 12 is connected to a drain outlet 100. The buffer tank valve 12 is an automatic drain valve that automatically opens when moisture accumulates in the buffer tank to a certain level, and the water is discharged to the outside through the drain outlet 100.

[0040] Preferably, if Figure 2As shown, in the drying gas generating device, the molecular sieve column group 4 includes a first molecular sieve column 41 and a second molecular sieve column 42 connected in parallel, a first three-way valve 43, a second three-way valve 44, a first on-off valve 45, a second on-off valve 46, and a flow control valve 47. The inlet of the first molecular sieve column 41 is connected to the first port of the first three-way valve 43 and the first port of the first on-off valve 45; the outlet of the first molecular sieve column 41 is connected to the first port of the second three-way valve 44 and the first port of the flow control valve 47; the inlet of the second molecular sieve column 42 is connected to the second port of the first three-way valve 43 and the first port of the second on-off valve 46; and the outlet of the second molecular sieve column 42 is connected to the second end of the second three-way valve 44 and the second port of the flow control valve 47. The first three-way valve 43, the second three-way valve 44, the first on-off valve 45, and the second on-off valve 46 are driven to their connected state using electromagnetic coils or compressed gas according to a set cycle. The control of the above valves can be achieved manually or automatically by a single-chip microcomputer. If it is manually controlled, its connectivity state can be manually triggered according to the experience value. If it is automatically controlled by the single chip microcomputer, a fixed cycle can be set to regularly control the connectivity state of different valves. When the connectivity state of the above valves is different, different molecular column sieves can be controlled to participate in moisture adsorption. For example, the first port of the first three-way valve 43 is turned on, the first switch valve 45 and the second switch valve are closed, and the first port of the second three-way valve 44 is turned on, then the first molecular sieve column 41 participates in moisture adsorption, and the second molecular sieve column 42 does not participate. At this time, if the second switch valve 46 is opened and the flow control valve 47 is opened, a part of the dry gas at the outlet of the first molecular sieve column 41 can pass through the second molecular sieve column 42 in the reverse direction, releasing the moisture therein, thereby restoring the second molecular sieve column 42 to a dry state. Through the above operation, the first molecular sieve column 41 and the second molecular sieve column 42 can work alternately, so that the device is always kept in an efficient dehydration state, and the outlet stably outputs dry gas with a dew point below -60°C.

[0041] Further preferably, the above device may further include a pressure reducing valve 7 and a pressure gauge 8. The inlet of the pressure reducing valve 7 is connected to the third port of the second three-way valve 44, and the outlet of the pressure reducing valve 7 is connected to the exhaust outlet. The pressure gauge 8 is disposed between the outlet of the pressure reducing valve 7 and the exhaust outlet 6. The exhaust pressure can be monitored by the pressure gauge 8, and the pressure reducing valve 7 is adjusted according to the reading of the pressure gauge 8 to keep the exhaust pressure within a stable range.

[0042] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0043] The above are only the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, on the basis of the principles of the present application, several other modifications can be made, which should also be considered as the scope of protection of the present application.

Claims

1. A dry gas generating device, characterized in that: include: A buffer tank is connected to a compressor, wherein the inlet of the buffer tank receives the gas to be dried and the outlet outputs the compressed gas; a first water removal and filtering component, receiving the compressed gas outputted from the buffer tank, and filtering the water in the compressed gas before outputting it; a molecular sieve column group, receiving the first-stage filtered gas output by the first water removal filter assembly and absorbing the moisture therein to output dehumidified gas; The second dehumidification filter assembly receives the dehumidified gas, performs secondary filtration on the moisture in the dehumidified gas, and then outputs dry gas, which is discharged through the exhaust outlet.

2. The dry gas generating device according to claim 1, characterized in that: The first water removal and filtration assembly comprises: The filter has a drain valve disposed at its drain outlet, and the drain valve is connected to the drain outlet.

3. The dry gas generating device according to claim 2, characterized in that: The first water removal filter assembly includes three filters, which are connected in sequence.

4. The dry gas generating device according to claim 1, characterized in that: A buffer tank valve is provided at the bottom of the buffer tank, and the buffer tank valve is connected to the drain outlet.

5. The dry gas generating device according to claim 1, characterized in that: Also includes: A pressure switch is provided between the compressor and the buffer tank, and opens when the gas pressure in the buffer tank reaches a set value.

6. The dry gas generating device according to any one of claims 1 to 5, characterized in that: The molecular sieve column group includes a first molecular sieve column and a second molecular sieve column connected in parallel, a first three-way valve, a second three-way valve, a first on-off valve, a second on-off valve and a flow regulating valve; The inlet of the first molecular sieve column is connected to the first port of the first three-way valve and the first port of the first switch valve; The outlet of the first molecular sieve column is connected to the first port of the second three-way valve and the first port of the flow regulating valve; The inlet of the second molecular sieve column is connected to the second port of the first three-way valve and the first port of the second switch valve; The outlet of the second molecular sieve column is connected to the second end of the second three-way valve and the second port of the flow regulating valve.

7. The dry gas generating device according to claim 6, characterized in that: The first three-way valve, the second three-way valve, the first on-off valve, and the second on-off valve are driven to a communication state at a set period using electromagnetic coils or compressed gas.

8. The dry gas generating device according to claim 7, characterized in that: Also includes a pressure reducing valve and pressure gauge: The inlet of the pressure reducing valve is connected to the third port of the second three-way valve, and the outlet of the pressure reducing valve is connected to the exhaust outlet; The pressure gauge is arranged between the outlet of the pressure reducing valve and the exhaust outlet.

9. The dry gas generating device according to any one of claims 2 to 5, characterized in that: The second water removal filter component is a filter, and a drain valve is provided at the drain outlet of the filter, and the drain valve is connected to the drain outlet.

10. The dry gas generating device according to claim 9, characterized in that: Each of the drain valves is an automatic drain valve that opens when the water content in the filter reaches a set amount.

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