An auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water.

Abstract

This utility model discloses an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, belonging to the technical field of N,N-dimethylformamide determination. This auxiliary device includes an auxiliary mechanism and a filtration mechanism. The auxiliary mechanism includes a housing with a door hinged to one side of the upper end via a pair of hinges. A water inlet pipe is installed at the upper end of the door, and a drain pipe is installed at the center of the bottom end of the housing. A limiting frame is installed at the bottom of the housing. The filtration mechanism includes a mounting frame with a pair of equal-dividing plates fixedly installed inside. Slide rails are installed on both sides of the mounting frame at the bottom of the pair of equal-dividing plates. A filter layer and an adsorption layer are slidably installed between the two pairs of slide rails. This utility model can effectively improve the accuracy of gas chromatography determination of N,N-dimethylformamide and has high practical value.

Description

Technical Field

[0001] This utility model relates to the field of N,N-dimethylformamide determination technology, specifically an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water. Background Technology

[0002] In fields such as environmental monitoring and chemical production quality control, gas chromatography is a commonly used technique for determining the content of N,N-dimethylformamide (DMF) in water. With its advantages of high sensitivity and high separation efficiency, it can achieve accurate quantitative analysis of DMF.

[0003] Based on the above, the inventors have discovered the following problems: Water samples often contain various impurities, among which particulate matter seriously affects the accuracy and reliability of gas chromatography determination. Particulate matter in water, such as suspended particles, microorganisms, and colloids, can interfere with the detection signal of gas chromatography. These particles may generate impurity peaks during vaporization, overlapping with or masking the target peak of DMF, leading to baseline drift and peak distortion in the chromatogram, thereby increasing the error in DMF content determination. On the other hand, after entering the gas chromatography system, particulate matter can easily clog key components such as the injection port, chromatographic column, or detector. Once the chromatographic column is clogged, it will lead to decreased column efficiency and poor resolution, which not only affects the accuracy of the detection results, but also significantly increases the detection cost and reduces the detection efficiency due to frequent column replacements.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided an auxiliary instrument to improve the accuracy of gas chromatography determination of N,N-dimethylformamide in water, in order to achieve a more practical purpose. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, in order to solve the problem mentioned in the background art that water samples often contain a variety of impurities, among which the presence of particulate matter seriously affects the accuracy and reliability of gas chromatography determination. Particulate matter in water, such as suspended particles, microorganisms, colloids, etc., can interfere with the detection signal of gas chromatography.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] An auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water includes an auxiliary mechanism and a filtration mechanism. The auxiliary mechanism includes a housing with a door hinged to one side of the upper end via a pair of hinges. A water inlet pipe is installed at the upper end of the door, and a drain pipe is installed at the center of the bottom end of the housing. A limiting frame is installed at the bottom of the housing. The filtration mechanism includes a mounting frame with a pair of equal-dividing plates fixedly installed inside. Slide rails are installed on both sides of the mounting frame at the bottom ends of the pair of equal-dividing plates. A filter layer and an adsorption layer are slidably installed between the two pairs of slide rails.

[0008] Furthermore, each of the equal distribution plates is provided with a plurality of first through holes, and each of the equal distribution plates is provided with a closed groove inside.

[0009] The beneficial effects of adopting the above-mentioned further scheme are that the first through hole of the equalization plate allows water to flow evenly, avoiding insufficient filtration due to excessive local flow velocity; the closed groove provides space for the baffle to move, which facilitates the adjustment of the water sample flow speed, and also facilitates the blocking of the first through hole by adjusting the baffle, so that the water sample can accumulate to a suitable height on the equalization plate before the first through hole is opened, thereby improving the dispersion effect of the water sample.

[0010] Furthermore, each of the enclosed grooves is slidably installed with a baffle, and the baffle has a second through hole that corresponds one-to-one with the first through hole.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the second through hole of the baffle corresponds to the first through hole, and the overlapping area of ​​the through holes can be adjusted by sliding the baffle to control the water flow speed, ensuring that the water sample is fully in contact with the filter layer and the adsorption layer, thereby improving the purification effect.

[0012] Furthermore, a waterproof electric telescopic rod is fixedly installed on one side of the enclosed groove, and one end of the waterproof electric telescopic rod is fixedly connected to one side of the baffle.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the waterproof electric telescopic rod drives the baffle to slide in the closed groove, realizing the automatic control of water flow regulation. At the same time, the waterproof design adapts to the humid environment and ensures the long-term stable operation of the mechanism.

[0014] Furthermore, the filter layer is a polytetrafluoroethylene (PTFE) membrane, and the adsorption layer is made of coconut shell activated carbon fiber. The beneficial effects of this further solution are that the PTFE membrane has chemical inertness and high mechanical strength, effectively trapping particulate impurities and microorganisms in the water sample, preventing them from clogging the chromatographic column or interfering with the detection signal. The coconut shell activated carbon fiber has a large specific surface area and strong adsorption capacity, enabling it to specifically remove organic matter and odor substances from the water sample, reducing background interference and improving the chromatographic peak resolution of N,N-dimethylformamide.

[0015] Furthermore, cavities are provided at the four corners of the upper surface of the filter layer and the adsorption layer, and protrusions are slidably installed inside the cavities.

[0016] The beneficial effects of adopting the above-mentioned further solution are that the sliding fit between the cavity and the protrusion provides elastic support for the filter layer and the adsorption layer, and the spring force makes the protrusion press against the groove of the slide rail, ensuring that the filter assembly is installed firmly, helping users to quickly position and install, and facilitating disassembly and replacement.

[0017] Furthermore, springs are fixedly installed at the bottom of the cavity, and the top of the springs is fixedly connected to the bottom of the protrusion.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the elastic force of the spring ensures that the protrusion and the groove are tightly engaged. Under strong external force, the protrusion can overcome the spring force and retract into the cavity, thereby facilitating the user to replace the filter layer and the adsorption layer.

[0019] Furthermore, the slide rail has grooves at the upper end of the protrusions, and the grooves are engaged with the protrusions.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the interlocking structure of the groove and the protrusion enables the rapid installation and positioning of the filter assembly, making it convenient for operators to quickly replace the contaminated filter layer and adsorption layer.

[0021] Furthermore, a first liquid level sensor is embedded in both the upper and lower ends of one side of the inside of the housing, and a second liquid level sensor is fixedly installed inside the mounting bracket at the upper end of one of the equalizing plates.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the first liquid level sensor monitors the water sample position in the upper equalization plate and the bottom of the tank in real time, so as to avoid excessive accumulation of water sample in the tank. The second liquid level sensor is used to monitor the amount of water sample accumulation on the equalization plate inside the mounting bracket and control the drainage of the first through hole in a timely manner.

[0023] Furthermore, a pair of buckles are installed on one side of the door, and a pair of retaining rings are installed on one side of the upper end of the box body. The buckles and retaining rings are engaged. Support legs are fixedly installed at the four corners of the bottom of the box body. The beneficial effect of adopting the above-mentioned further solution is that the engagement of the buckles and retaining rings ensures that the door closes tightly, preventing water from splashing out or odors from leaking out.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows: This auxiliary device improves the accuracy of gas chromatography determination of N,N-dimethylformamide in water. The auxiliary mechanism's housing provides a water sample processing space, and the inlet and outlet pipes enable the injection and discharge of water samples. The limiting frame supports the filtration mechanism to ensure its stability. The filtration mechanism evenly disperses the water flow through a uniform distribution plate. The filter layer and adsorption layer sequentially remove impurities and organic matter from the water sample, reducing the influence of interfering substances on gas chromatography determination, thereby improving the accuracy of N,N-dimethylformamide determination. The first through-hole of the uniform distribution plate allows water to flow evenly, avoiding excessively high local flow rates that could lead to incomplete filtration. The enclosed groove provides sufficient space for the baffle to move, facilitating the adjustment of the water sample flow rate. It also allows for the blocking of the first through hole by adjusting the baffle, enabling the water sample to accumulate to a suitable height on the equalization plate before opening the first through hole, thus improving the dispersion effect of the water sample. The polytetrafluoroethylene membrane has chemical inertness and high mechanical strength, which can effectively trap particulate impurities and microorganisms in the water sample, preventing them from clogging the chromatographic column or interfering with the detection signal. The coconut shell activated carbon fiber has a large specific surface area and strong adsorption capacity, which can specifically remove organic matter and odor substances in the water sample, reduce background interference, and improve the chromatographic peak resolution of N,N-dimethylformamide. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, as disclosed in an embodiment of this utility model.

[0026] Figure 2 This is a schematic diagram of the internal three-dimensional structure of an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, as disclosed in an embodiment of this utility model.

[0027] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the filter mechanism of an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, as disclosed in an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the equalization plate of an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, as disclosed in an embodiment of this utility model.

[0029] Figure 5 This is a partial side cross-sectional view of the cavity of an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, as disclosed in an embodiment of this utility model.

[0030] In the diagram: 1. Auxiliary mechanism; 101. Box body; 102. Support leg; 103. Drain pipe; 104. Box door; 105. Water inlet pipe; 106. Buckle; 107. Snap ring; 108. First liquid level sensor; 109. Limiting frame; 2. Filtration mechanism; 201. Mounting frame; 202. Dividing plate; 203. Second liquid level sensor; 204. Filter layer; 205. Adsorption layer; 206. Slide rail; 207. Protrusion; 208. Groove; 209. First through hole; 210. Baffle; 211. Sealing groove; 212. Waterproof electric telescopic rod; 213. Spring; 214. Second through hole; 215. Cavity. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-5 This utility model provides a technical solution: an auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, comprising an auxiliary mechanism 1 and a filtration mechanism 2. The auxiliary mechanism 1 includes a housing 101, with a door 104 hinged to one side of the upper end of the housing 101 via a pair of hinges. A water inlet pipe 105 is installed at the upper end of the door 104, and a drain pipe 103 is installed at the center of the bottom end of the housing 101. A limiting bracket 109 is installed at the bottom of the housing 101. The filtration mechanism 2 includes a mounting bracket 201, with a pair of equalizing plates 202 fixedly installed inside the mounting bracket 201. Slide rails 206 are installed at the bottom of a pair of equal distribution plates 202 on both sides. A filter layer 204 and an adsorption layer 205 are slidably installed between the two pairs of slide rails 206. The box 101 of the auxiliary mechanism 1 provides a water sample processing space. The water inlet pipe 105 and the water outlet pipe 103 realize the injection and discharge of water samples. The limiting frame 109 supports the filter mechanism 2 to ensure its stability. The filter mechanism 2 evenly disperses the water flow through the equal distribution plates 202. The filter layer 204 and the adsorption layer 205 remove impurities and organic matter in the water sample in sequence, reduce the influence of interfering substances on gas chromatography determination, and thus improve the determination accuracy of N,N-dimethylformamide.

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-5Each equal distribution plate 202 has several first through holes 209. Each equal distribution plate 202 has a closed groove 211 inside. A baffle 210 is slidably installed inside each closed groove 211. Each baffle 210 has a second through hole 214 corresponding to one of the first through holes 209. A waterproof electric telescopic rod 212 is fixedly installed on one side of each closed groove 211. One end of the waterproof electric telescopic rod 212 is fixedly connected to one side of the baffle 210. The filter layer 204 is a polytetrafluoroethylene membrane, and the adsorption layer 205 is made of coconut shell activated carbon fiber. Cavities 215 are formed at the four corners of the upper surface of both the filter layer 204 and the adsorption layer 205. Protrusions 207 are slidably installed inside each cavity 215. A fixedly installed protrusion 207 is installed at the bottom of each cavity 215. A spring 213 is provided, with its top end fixedly connected to the bottom end of the protrusion 207. The interiors of two pairs of slide rails 206, located at the upper end of the protrusion 207, each have a groove 208. The groove 208 engages with the protrusion 207. The first through-hole 209 of the equalizing plate 202 allows water to flow evenly, preventing excessively high local flow rates that could lead to insufficient filtration. The closed groove 211 provides space for the baffle 210 to move, facilitating adjustment of the water sample flow rate. It also allows the baffle 210 to be adjusted to block the first through-hole 209, allowing the water sample to accumulate to a suitable height on the equalizing plate 202 before opening the first through-hole 209, thus improving the dispersion effect. The second through-hole 214 of the baffle 210 corresponds to the first through-hole 209, and can be moved by sliding the baffle. Plate 210 allows for adjustable overlap of through-holes, enabling control of water flow velocity and ensuring sufficient contact between the water sample and the filter layer 204 and adsorption layer 205, thus improving purification efficiency. A waterproof electric telescopic rod 212 drives the baffle 210 to slide within the closed groove 211, automating water flow regulation. Its waterproof design adapts to humid environments, ensuring long-term stable operation. The polytetrafluoroethylene membrane possesses chemical inertness and high mechanical strength, effectively trapping particulate impurities and microorganisms in the water sample, preventing clogging of the chromatographic column or interference with detection signals. Coconut shell activated carbon fiber has a large specific surface area and strong adsorption capacity, specifically removing organic matter and odor substances from the water sample, reducing background interference, and improving the chromatographic peak resolution of N,N-dimethylformamide. The sliding fit between cavity 215 and protrusion 207 provides elastic support for filter layer 204 and adsorption layer 205. The elastic force of spring 213 causes protrusion 207 to press against groove 208 of slide rail 206, ensuring that the filter assembly is installed firmly and helping users to quickly position and install it, and facilitate disassembly and replacement. The elastic force of spring 213 ensures that protrusion 207 and groove 208 are tightly engaged. Under strong external force, protrusion 207 can overcome the elastic force of spring 213 and retract into cavity 215, thereby facilitating the user to replace filter layer 204 and adsorption layer 205. The engaging structure of groove 208 and protrusion 207 enables quick installation and positioning of filter assembly, making it easy for operators to quickly replace contaminated filter layer 204 and adsorption layer 205.

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1-5 The first liquid level sensor 108 is embedded in the upper and lower ends of one side of the inner side of the box 101. The second liquid level sensor 203 is fixedly installed in the upper end of one of the equalizing plates 202 inside the mounting bracket 201. A pair of buckles 106 are installed on one side of the box door 104. A pair of retaining rings 107 are installed on the upper side of the box 101. The buckles 106 and retaining rings 107 are engaged. Support legs 102 are fixedly installed at the four corners of the bottom of the box 101. The first liquid level sensor 108 monitors the position of the water sample in the upper equalizing plate 202 and the bottom of the box 101 in real time to avoid excessive accumulation of water sample inside the box 101. The second liquid level sensor 203 is used to monitor the amount of water sample accumulated on the equalizing plate 202 inside the mounting bracket 201 and control the drainage of the first through hole 209 in time. The buckles 106 and retaining rings 107 are engaged to ensure that the box door 104 is closed tightly to prevent water sample from splashing out or odor from leaking out.

[0037] Specifically, the working principle of this auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water is as follows: During use, the water sample is injected into the housing 101 through the inlet pipe 105 and pre-treated by the filter mechanism 2 fixed by the limiting frame 109. The water sample first flows through the equalization plate 202, where the first through hole 209 evenly disperses the water flow. The waterproof electric telescopic rod 212 drives the baffle 210 to slide. The flow rate is controlled by adjusting the overlapping area of ​​the second through hole 214 and the first through hole 209. The second liquid level sensor 203 monitors the liquid level above the equalization plate 202. When the water level reaches the set value, the opening degree of the baffle 210 is automatically adjusted to ensure that the water sample is fully retained and evenly distributed on the equalization plate 202. Downstream, to avoid incomplete purification due to localized flushing, the uniform water flow passes sequentially through the filter layer 204 and the adsorption layer 205. The polytetrafluoroethylene membrane filter layer traps particulate impurities and microorganisms, while the coconut shell activated carbon fiber adsorption layer removes organic matter and odor substances. The filter assembly is fixed by the protrusion 207 and the groove 208 of the slide rail 206. The spring 213 provides elastic support to ensure the assembly is stable and easy to replace quickly. The first liquid level sensor 108 monitors the water level in the tank 101 in real time. The treated water sample is discharged through the drain pipe 103 and enters the gas chromatography detection stage. The tank door 104 is sealed by the buckle 106 and the retaining ring 107 to prevent water sample splashing or volatile substance leakage during operation.

[0038] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

Claims

1. An auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water, characterized in that, The system includes an auxiliary mechanism (1) and a filtration mechanism (2). The auxiliary mechanism (1) includes a housing (101). A door (104) is hinged to one side of the upper end of the housing (101) by a pair of hinges. A water inlet pipe (105) is installed at the upper end of the door (104). A drain pipe (103) is installed at the center of the bottom end of the housing (101). A limit frame (109) is installed at the bottom inside the housing (101). The filtration mechanism (2) includes a mounting frame (201). A pair of equal-dividing plates (202) are fixedly installed inside the mounting frame (201). Slide rails (206) are installed on both sides of the mounting frame (201) at the bottom end of the pair of equal-dividing plates (202). A filter layer (204) and an adsorption layer (205) are slidably installed between the two pairs of slide rails (206).

2. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, The equal distribution plate (202) is provided with a plurality of first through holes (209), and the interior of the equal distribution plate (202) is provided with a closed groove (211).

3. The auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 2, characterized in that, Each of the enclosed grooves (211) is slidably installed with a baffle (210), and the baffle (210) is provided with a second through hole (214) corresponding to the first through hole (209).

4. The auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 3, characterized in that, Waterproof electric telescopic rods (212) are fixedly installed on one side of the closed groove (211), and one end of the waterproof electric telescopic rods (212) is fixedly connected to one side of the baffle (210).

5. The auxiliary device for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, The filter layer (204) is a polytetrafluoroethylene membrane, and the adsorption layer (205) is made of coconut shell activated carbon fiber.

6. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, The filter layer (204) and the adsorption layer (205) have cavities (215) at the four corners of their upper surfaces, and protrusions (207) are slidably installed inside the cavities (215).

7. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 6, characterized in that, Springs (213) are fixedly installed at the bottom of the cavity (215), and the top of the springs (213) is fixedly connected to the bottom of the protrusion (207).

8. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 7, characterized in that, The interior of each pair of slide rails (206) is provided with a groove (208) at the upper end of the protrusion (207), and the groove (208) is engaged with the protrusion (207).

9. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, The first liquid level sensor (108) is embedded in both the upper and lower ends of one side of the box (101), and the second liquid level sensor (203) is fixedly installed inside the mounting bracket (201) at the upper end of one of the equalizing plates (202).

10. The auxiliary apparatus for improving the accuracy of gas chromatography determination of N,N-dimethylformamide in water according to claim 1, characterized in that, A pair of buckles (106) are installed on one side of the door (104), and a pair of retaining rings (107) are installed on one side of the upper end of the box body (101). The buckles (106) and retaining rings (107) are engaged with each other. Support legs (102) are fixedly installed at the four corners of the bottom end of the box body (101).

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