Micro-water instrument operation box

Abstract

The utility model relates to the technical field of trace moisture analysis of organic chemical products. A micro-water instrument operation box comprises a box body, a drying water absorption system and a sucking pump, an air inlet three-way pipe and an exhaust pipe are arranged on the back face of the box body, and an inlet of the air inlet three-way pipe is communicated with dry air; the drying and water absorbing system is flatly laid on the top of the box body, an exhaust port of the drying and water absorbing system is connected with the other inlet of the air inlet three-way pipe of the box body, the drying and water absorbing system comprises three groups of drying modules which are connected in parallel, and each group of drying module comprises a molecular sieve drying pipe and a silica gel drying pipe which are connected in series; the air pump is fixed to the top of the box body, an outlet of the air pump is connected with an air inlet of the drying and water absorbing system, and an inlet of the air pump is communicated with air. The operation box is simple and reasonable in structure, the relative humidity in the operation box can be effectively reduced, stable detection of the moisture content of the micro-moisture meter is guaranteed, the reproducibility of detection data is improved, and the accuracy and the reliability of analysis results are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of trace moisture analysis of organic chemical products, in particular to a trace moisture instrument operating box, which is a low-humidity protection operating box for instruments analyzing trace moisture in organic chemical products. Background Art

[0002] Organic chemical products generally need to analyze their moisture content, especially some high-purity organic chemical products, such as some spectrally pure reagents and chromatographically pure reagents, which require extremely low moisture content, and even the mass fraction of moisture is less than 0.005%. The micro-water meter used to analyze the moisture content of such products is generally a Karl Fischer titrator, which uses the coulometric method and the volumetric method. When conducting moisture content analysis and testing, the micro-water meter needs to be in a test environment with low relative humidity to avoid the external environment affecting the accuracy of the micro-water meter's measurement results. However, the air has a certain relative humidity, especially in rainy weather, the relative humidity can be as high as 90%, which causes the moisture in the air to continuously dissolve into the titration cell of the micro-water meter, so that the instrument cannot complete pre-drying and cannot be used. Or even after pre-drying is completed, in the process of adding the sample to be tested to the titration cell, the moisture in the air enters the titration cell again, resulting in poor repeatability of the test data and low accuracy of the result analysis. Summary of the invention

[0003] The purpose of the utility model is to solve the above-mentioned problems and shortcomings, and proposes a micro-water meter operating box, which can adjust the relative humidity of the air in the box and maintain the relative humidity below 20%, providing a good test space for the micro-water meter in the box, and solving the problem that the air environment with high humidity affects the accuracy of the moisture content determination of the tested sample.

[0004] To achieve the above purpose, the technical solution adopted is:

[0005] The utility model provides a micro-water instrument operation box, comprising:

[0006] A box body, wherein an air intake tee pipe and an exhaust pipe are arranged on the back of the box body, and an inlet of the air intake tee pipe is communicated with dry air;

[0007] A drying and water absorption system, which is laid flat on the top of the box, the exhaust port of the drying and water absorption system is connected to the other inlet of the air intake tee of the box, the drying and water absorption system comprises three groups of drying modules connected in parallel, and each group of drying modules comprises two molecular sieve drying tubes and silica gel drying tubes connected in series;

[0008] And an air pump is fixed on the top of the box body, the outlet of the air pump is connected with the air inlet of the dry water absorption system, and the inlet of the air pump is connected with the air.

[0009] According to the micro-water instrument operating box of the utility model, further, the dry air adopts instrument air or cylinder compressed air with a dew point below -60°C.

[0010] According to the micro-water meter operation box of the utility model, further, a hygrometer is installed on the upper front part of the box body, and a pressure gauge is also installed on the top of the box body.

[0011] According to the micro-water instrument operation box of the utility model, further, the three molecular sieve drying tubes are connected to the outlet of the air pump through the air inlet four-way pipe.

[0012] According to the micro-water instrument operation box of the utility model, further, the tube body of the molecular sieve drying tube is filled with a detachable molecular sieve for absorbing water from the air and drying it.

[0013] According to the micro-water instrument operating box of the utility model, further, the three silica gel drying tubes are connected to another inlet of the air intake three-way pipe of the box body through the exhaust four-way pipe.

[0014] According to the micro-water instrument operation box of the utility model, further, the tube body of the silica gel drying tube is filled with detachable color-changing silica gel for further absorbing moisture in the air and detecting whether the water absorption performance of the molecular sieve drying tube fails.

[0015] According to the micro-water instrument operation box of the utility model, further, the box body also includes a box body door hinged on the side, an operation circular hole opened on the front, and a power line hole and a liquid pipe hole opened on the back.

[0016] According to the micro-water meter operation box of the utility model, further, a second ball valve and a first ball valve are respectively provided at one inlet and the other inlet of the air intake three-way pipe, a third ball valve is provided at the exhaust pipe, and a fourth ball valve and a fifth ball valve are respectively provided at the inlet and outlet of the drying module.

[0017] According to the micro-water instrument operation box of the utility model, further, the box body is made of transparent acrylic material or tempered glass material, and the tube bodies of the molecular sieve drying tube and the silica gel drying tube are both made of transparent acrylic material.

[0018] The beneficial effects achieved by adopting the above technical solution are:

[0019] Compared with the prior art, the micro-water meter operation box of the utility model can effectively absorb moisture in the air through the molecular drying sieve tube and the silica gel drying tube arranged in series, and maintain the relative humidity of the air in the micro-water meter operation box below 20%, providing a good test environment for the sample under test. In addition, the application adopts multiple sets of drying modules arranged in parallel, which can greatly improve the drying efficiency of the drying modules for air, ensure the smooth flow of air in the micro-water meter operation box, and improve the stability of the test environment.

[0020] The utility model has a simple and reasonable structure, and the drying and water absorption system can effectively reduce the relative humidity of the air, ensure the stable detection of the moisture content of the micro-water meter in the operation box, improve the reproducibility of the detection data, and ensure the accuracy and reliability of the analysis results. In addition, the molecular sieve and color-changing silica gel of the drying module are both detachable and removable materials, and both can be reused after high-temperature drying, which further reduces the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. The drawings are only used to show some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0022] Figure 1 This is one of the structural schematic diagrams of the micro-water instrument operation box of the embodiment of the utility model;

[0023] Figure 2 This is the second structural schematic diagram of the micro-water instrument operation box of the embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of a drying water absorption system according to an embodiment of the utility model;

[0025] Figure 4 It is a structural schematic diagram of a drying module according to an embodiment of the utility model;

[0026] The meanings of the numbers in the figure are:

[0027] 1. Box body, 101. Hygrometer, 102. Pressure gauge, 103. Operation round hole, 104. Operation door, 105. Operation door handle, 106. Movable buckle, 107. Box door, 108. Door handle, 109. Air inlet three-way pipe, 110. First ball valve, 111. Second ball valve, 112. Exhaust pipe, 113. Third ball valve, 114. Power cord hole, 115. Liquid pipe hole, 116. Bottom foot;

[0028] 2. Drying water absorption system, 21. Drying module, 201. Inlet four-way pipe, 202. Fourth ball valve, 203. Molecular sieve drying tube, 204. Silica gel drying tube, 205. Fifth ball valve, 206. Exhaust four-way pipe;

[0029] 3. Vacuum pump. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings of the specific embodiments of the utility model to clearly and completely describe the exemplary scheme of the utility model. Unless otherwise defined, the technical terms or scientific terms used in the utility model should be the common meanings understood by people with ordinary skills in the relevant field.

[0031] like Figures 1 to 4 As shown, the micro-water instrument operation box of this embodiment includes a box body 1, a dry water absorption system 2 and an air pump 3. The box body 1 is used as the main structure to provide a good test environment for the micro-water instrument. An air intake tee 109 and an exhaust pipe 112 are arranged on the back of the box body 1. An inlet of the air intake tee 109 is connected to dry air. Here, the dry air uses instrument air or cylinder compressed air with a dew point below -60°C; the dry water absorption system 2 is arranged flat on the top of the box body 1, and its exhaust port is connected to the other inlet of the air intake tee 109 of the box body 1. The dry water absorption system 2 includes three groups of drying modules 21 connected in parallel, and each group of drying modules 21 includes two molecular sieve drying tubes 203 and silica gel drying tubes 204 connected in series; the air pump 3 can be fixed on the top of the box body 1 by bolts, and its outlet is connected to the air intake of the dry water absorption system 2, and its inlet is connected to the air.

[0032] A hygrometer 101 is installed on the upper front of the box 1 for real-time detection of the relative humidity in the box 1. A pressure gauge 102 is also installed on the top of the box 1 for real-time detection of the pressure in the box 1.

[0033] The three molecular sieve drying tubes 203 of the drying and water absorption system 2 are connected to the outlet of the air pump 3 through the air inlet four-way pipe 201. The tube body of the molecular sieve drying tube is filled with a detachable molecular sieve, which is used to absorb water from the air and dry it.

[0034] The three silica gel drying tubes 204 of the drying and water absorption system 2 are connected to the other inlet of the air intake three-way pipe 109 of the box body 1 through the exhaust four-way pipe 206. The tube body of the silica gel drying tube 204 is filled with detachable color-changing silica gel, which is used to further absorb moisture in the air and detect whether the water absorption performance of the molecular sieve drying tube 203 has failed.

[0035] A box door 107 is hingedly provided on the right side of the box body 1, and a door handle 108 is provided on the box door 107 for easy opening to put in and take out the micro-water instrument.

[0036] A plurality of movable buckles 106 are arranged between the box door 107 and the box body 1, and a sealing ring is arranged on the outer ring of the box door 107. After the box door 107 is closed, the movable buckles 106 and the sealing ring jointly realize the locking and sealing between the box door 107 and the box body 1.

[0037] Two operating circular holes 103 are opened on the front of the box body 1, and an operating door 104 is arranged on the operating circular holes 103. The outer circle of the operating door 104 has a sealing strip to achieve sealing with the box body 1, and an operating door handle 105 is arranged on the operating door 104. After the operating door 104 is opened using the operating door handle 105, the test personnel enter the box body 1 through the operating circular holes 103 with both hands to perform test operations on the micro-water instrument.

[0038] As an option, the operating door 104 can be opened by sliding or rotating. The embodiment adopts the rotating opening method. The rotating operating door 104 is an independent component, which is easy to replace and reduces the maintenance time of the operating door 104 after fatigue damage caused by multiple openings and closings.

[0039] The power line hole 114 and the liquid pipe hole 115 are respectively opened on both sides of the back of the box body 1, and the power line hole 114 and the liquid pipe hole 115 are kept at a relatively far distance to prevent the liquid pipe from leaking liquid and causing contamination to the power line and thus causing safety accidents.

[0040] A second ball valve 111 and a first ball valve 110 are respectively provided at one inlet and the other inlet of the air intake tee 109 of the housing 1, a third ball valve 113 is provided at the exhaust pipe 112, and a fourth ball valve 203 and a fifth ball valve 205 are respectively provided at the inlet and outlet of the drying module, and each ball valve controls the opening and closing state of the corresponding pipeline.

[0041] The housing 1 is made of transparent acrylic material or tempered glass material, and the tube bodies of the molecular sieve drying tube 203 and the silica gel drying tube 204 are all made of transparent acrylic material. Preferably, in this embodiment, the housing 1, the molecular sieve drying tube 203 and the silica gel drying tube 204 are all made of acrylic material, and its good light transmission performance ensures that the test personnel can accurately observe the test process and the color change of the color-changing silica gel, thereby judging whether the molecular sieve water absorption is invalid. In addition, the acrylic material is easy to cut and shape, and its good processing performance facilitates the production and maintenance of the housing 1, the molecular sieve drying tube 203 and the silica gel drying tube 204.

[0042] Four feet 116 are provided at the bottom of the box body 1 for moving and fixing the micro-water instrument operation box.

[0043] The working principle of the technical solution of this application is:

[0044] like Figures 1 to 4 As shown, first, after releasing the movable buckle 106, the box door 107 is opened by the door handle 108, and the micro-water meter is placed in the operation box. Then, the power cord of the micro-water meter is passed through the power cord hole 114, and the liquid tubes of the solution bottle and the waste liquid bottle are passed through the liquid tube hole 115. Finally, the box door 107 is closed, and the box 1 is locked with the movable buckle 106.

[0045] Secondly, open the first ball valve 110, the third ball valve 113, the fourth ball valve 202 and the fifth ball valve 205, close the second ball valve 111, check that the switch status of each ball valve is correct, and then turn on the power supply of the vacuum pump 3. The vacuum pump 3 starts to pump air to the dry water absorption system 2 through the air intake four-way pipe 201. After the air enters the molecular sieve drying tube 203, the molecular sieve absorbs the moisture in the air to achieve the initial drying of the air. Then the air enters the silica gel drying tube 204, and the color-changing silica gel absorbs the moisture in the air again to achieve the secondary drying of the air. After the secondary drying of the dry water absorption system 2, the air pumped by the vacuum pump 3 becomes dry air.

[0046] During this drying process, the test personnel continuously observe the color change of the color-changing silica gel. ① If the color of the color-changing silica gel does not change, it means that the water absorption performance of the molecular sieve has not failed, and the drying and water absorption of the air can proceed normally. ② If the color-changing silica gel begins to turn pink, it means that the water absorption performance of the molecular sieve has failed and the color-changing silica gel begins to absorb water and dry the air. ③ If the color change range of the color-changing silica gel reaches two-thirds, it means that the water absorption performance of the color-changing silica gel is about to fail. At this time, the molecular sieve and color-changing silica gel should be replaced in time. When replacing the molecular sieve and color-changing silica gel, all ball valves and power supplies must be turned off before replacing the molecular sieve and color-changing silica gel to ensure that the water absorption work of the drying and water absorption system 2 can be carried out safely. The replaced molecular sieve and color-changing silica gel can be reused after high-temperature drying.

[0047] Once again, the dry air treated by the drying and water absorption system 2 enters the box 1 through the exhaust four-way pipe 206 and the air intake three-way pipe 109 of the box 1, and then the air in the box 1 flows out from the exhaust pipe 112, and at the same time, the pressure and relative humidity of the air in the box 1 change, that is, the readings of the pressure gauge 102 and the hygrometer 101 change. At this time, the tester adjusts the pumping pressure of the vacuum pump 3 until the reading of the pressure gauge 102 is 0MPa, that is, the pressure inside and outside the box 1 is basically the same, and the air in the box 1 has a stable flow rate at the same time. In addition, as the dry air continues to blow and flow in the box 1, the relative humidity of the air in the box 1 gradually decreases, and the reading of the hygrometer 101 also gradually decreases. When the reading of the hygrometer 101 is less than 20%, the relative humidity in the box 1 meets the conditions required for the moisture content detection test. At this time, the sample to be tested is placed in the titration cell of the micro-water instrument by operating the circular hole 103 to start the moisture content determination test.

[0048] In addition to the above-mentioned method of treating air using the dry water absorption system 2, dry air (instrument air or cylinder compressed air with a dew point below -60°C) can also be connected to an inlet of the air intake tee 109 of the box 1. At this time, the air pump 2 and the first ball valve 110 are closed, and the second ball valve 111 and the third ball valve 113 are opened, and the dry air can enter the box 1. After the dry air continues to flow and purge in the box 1 for a period of time, the relative humidity in the box 1 is reduced to below 20%, meeting the conditions required for the moisture content detection test.

[0049] Finally, the power of the micro-water meter is turned on, and after the operating door 104 is opened by operating the door handle 105, the tester extends both hands into the box body 1 through the operating circular hole 103 to perform a test on the moisture content of the sample under test.

[0050] After the test of the moisture content of the sample is completed, disconnect the power supply of the micro-water meter and the vacuum pump 3 and close all ball valves. When the micro-water meter is used next time, open the micro-water meter operation box half an hour in advance to adjust the test environment conditions in the box 1 for the test. In addition, if the micro-water meter needs to work continuously, the air in the box 1 needs to circulate continuously to ensure that the relative humidity in the box 1 is always below 20%. After the relative humidity reaches 20%, the air intake will be very small, which also reduces the test cost while ensuring the moisture content detection test environment.

[0051] The technical solution of the utility model is described above in combination with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

[0052] In the description of the present invention, it should be understood that the expressions “first” and “second” are used to describe the various elements of the present invention and do not represent any limitation on order, quantity or importance, but are only used to distinguish one component from another.

[0053] It should be noted that when one element is “connected”, “coupled” or “connected” to another element, it may mean that they are directly connected, coupled or connected, but it should be understood that there may be intermediate elements between the two; that is, the positional relationships of direct connection and indirect connection are covered.

[0054] It should be noted that the use of "a" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects.

[0055] It should be noted that terms such as "up", "down", "left" and "right" indicating orientation or positional relationship are only used to indicate relative positional relationship. This is for the convenience of describing the present utility model, and does not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0056] The preferred embodiments for implementing the present invention have been described in detail above, but it should be understood that the role of these embodiments is only to exemplify, and is not intended to limit the scope, applicability or configuration of the present invention in any way. The protection scope of the present invention is defined by the attached claims and their equivalents. A person of ordinary skill in the art can make many changes to the above embodiments under the guidance of the present invention, and these changes all fall within the protection scope of the present invention.

Claims

1. A micro-water instrument operating box, It is characterized in that include: A box body, wherein an air intake tee pipe and an exhaust pipe are arranged on the back of the box body, and an inlet of the air intake tee pipe is communicated with dry air; A drying and water absorption system, which is laid flat on the top of the box, the exhaust port of the drying and water absorption system is connected to the other inlet of the air intake tee of the box, the drying and water absorption system comprises three groups of drying modules connected in parallel, and each group of drying modules comprises two molecular sieve drying tubes and silica gel drying tubes connected in series; And an air pump is fixed on the top of the box body, the outlet of the air pump is connected with the air inlet of the dry water absorption system, and the inlet of the air pump is connected with the air.

2. The micro-water instrument operation box according to claim 1, It is characterized in that The dry air is instrument air or cylinder compressed air with a dew point below -60°C.

3. The micro-water instrument operation box according to claim 1, It is characterized in that A hygrometer is installed on the upper front part of the box body, and a pressure gauge is also installed on the top of the box body.

4. The micro-water instrument operation box according to claim 1, It is characterized in that The three molecular sieve drying tubes are connected to the outlet of the air pump through an air inlet four-way pipe.

5. The micro-water instrument operation box according to claim 4, It is characterized in that The molecular sieve drying tube is filled with a detachable molecular sieve in the tube body, which is used for absorbing water and drying the air.

6. The micro-water instrument operation box according to claim 1, It is characterized in that The three silica gel drying tubes are connected to another inlet of the air intake three-way pipe of the box body through the exhaust four-way pipe.

7. The micro-water instrument operation box according to claim 6, It is characterized in that The body of the silica gel drying tube is filled with detachable color-changing silica gel for further absorbing moisture in the air and detecting whether the water absorption performance of the molecular sieve drying tube is ineffective.

8. The micro-water instrument operation box according to claim 1, It is characterized in that The box body also includes a box body door hinged on the side, an operation circular hole opened on the front, and a power line hole and a liquid pipe hole opened on the back.

9. The micro-water instrument operation box according to claim 1, It is characterized in that A second ball valve and a first ball valve are respectively provided at one inlet and the other inlet of the air intake tee, a third ball valve is provided at the exhaust pipe, and a fourth ball valve and a fifth ball valve are respectively provided at the inlet and outlet of the drying module.

10. The micro-water instrument operation box according to claim 1, It is characterized in that The box body is made of transparent acrylic material or tempered glass material, and the tube bodies of the molecular sieve drying tube and the silica gel drying tube are both made of transparent acrylic material.

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