Anti-corrosion COD heating device

Abstract

This utility model relates to the field of chemical instrument technology and discloses a corrosion-resistant COD heating device, including a heating frame. The lower part of the heating frame has a cavity assembly for supporting and uniformly heating the digestion tube. The upper part of the heating frame has an acid mist collection assembly for collecting and neutralizing volatile acid mist. Inside the acid mist collection assembly is a pop-out component for supporting and easily replacing the adsorbent material. Inside the pop-out component is alkaline adsorbent cotton for neutralizing acidic volatiles. In operation, the digestion tube is placed on an arc-shaped base, and the heating wire is uniformly heated through the placement seat to induce a reaction. The generated acid mist is drawn in by an acid-resistant fan through a channel and sent into the collection chamber through a delivery pipe, where it is neutralized by the alkaline adsorbent cotton. The adsorbent cotton consumable can be easily replaced through the pop-out component, achieving effective collection and neutralization of acid mist and convenient and safe replacement of consumables, thus improving the equipment's corrosion resistance and user experience.

Description

Technical Field

[0001] This utility model relates to the field of chemical instrument technology, specifically to a corrosion-resistant COD heating device. Background Technology

[0002] The COD heating device is a key piece of equipment specifically used in chemical oxygen demand (COD) determination experiments. Its core function is to digest (or decompose) water samples under high temperature conditions. It is a dedicated constant temperature heating device designed for COD determination experiments in water quality testing. Its core function is to seal and digest water samples containing strong acid and oxidant at a precisely controlled constant high temperature (usually 165℃ or 150℃), thereby rapidly and thoroughly oxidizing organic pollutants in the water, providing an accurate and reliable reaction basis for subsequent measurement of its oxygen consumption.

[0003] Most common corrosion-resistant COD heating devices rely solely on improving the corrosion resistance of individual components, lacking measures for actively treating and collecting the highly corrosive acid mist continuously generated during the reaction. This results in the acid mist easily spreading and accumulating inside the equipment, corroding precision temperature control elements, circuit boards, and metal structures over a long period, causing frequent equipment failures, decreased measurement accuracy, and significantly shortened service life. Furthermore, when the sample overflows and flows onto the equipment surface, it can easily damage the equipment. Therefore, those skilled in the art provide a corrosion-resistant COD heating device to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a corrosion-resistant COD heating device to solve the problems mentioned in the background section of the prior art.

[0005] This utility model provides the following technical solution: a corrosion-resistant COD heating device, including a heating frame, the lower end of which is provided with a cavity assembly for supporting and uniformly heating the digestion tube, the upper end of which is provided with an acid mist collection assembly for collecting and neutralizing volatile acid mist, the inside of which is provided with a pop-out assembly for supporting and easily replacing the adsorbent material, and the inside of which is provided with alkaline adsorbent cotton for neutralizing acidic volatiles.

[0006] As a preferred embodiment of the above technical solution, heating wires are evenly distributed in the inner cavity of the heating frame, and the heating wires are arranged in an S-shape.

[0007] As a preferred embodiment of the above technical solution, the cavity assembly includes a PTFE gasket, which is fixedly connected to the inner wall of the heating frame. A placement seat is fixedly sleeved on the upper side of the PTFE gasket, and a flow guide groove is provided inside the placement seat. Multiple arc-shaped bases are provided at the upper end of the placement seat.

[0008] As a preferred embodiment of the above technical solution, the acid mist collection assembly includes channels symmetrically located at the upper part of the heating frame. Fixed fan frames are fixedly connected to the inner sides of both channels, and acid-resistant fans are rotatably connected to the lower ends of both fixed fan frames. Conveying pipes are fixedly connected to the upper ends of both channels, and collection chambers are fixedly connected to the upper ends of both conveying pipes.

[0009] As a preferred embodiment of the above technical solution, the ejector assembly includes a slide block, which is fixedly connected to the bottom center area inside the collection cavity. Two slide grooves are symmetrically opened at the upper end of the slide block. Two fixing posts are symmetrically arranged on one side of the inner wall of the collection cavity. Compression springs are sleeved on the outer sides of the two fixing posts. Fixing protrusions are fixedly connected to the ends of the two compression springs away from the inner wall of the collection cavity.

[0010] As a preferred embodiment of the above technical solution, an absorbent cotton placement box is fixedly connected to the upper end of the two fixed protrusions. The absorbent cotton placement box is slidably sleeved on the inner side of the slide block. A viewing window is fixedly connected to the outer wall of the absorbent cotton placement box away from the two fixed columns. A snap-fit ​​groove is provided at the lower center of the absorbent cotton placement box near the viewing window.

[0011] As a preferred embodiment of the above technical solution, a slot is provided at the center edge of the slide block, and a fixed shaft is fixedly connected to the two inner walls of the slot that are close to each other. A buckle main column is rotatably sleeved on the outer side of the fixed shaft. A pressing plate is fixedly connected to one end of the buckle main column, and a buckle protrusion is fixedly connected to the other end of the buckle main column away from the pressing plate.

[0012] As a preferred embodiment of the above technical solution, a return spring is fixedly connected to the lower end of the main post of the buckle near the buckle protrusion, and a second fixing post is sleeved inside the return spring, with the lower end of the second fixing post fixedly connected to the bottom center of the slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] When the device starts working, the digestion tubes containing reagents are placed on the arc-shaped base of the chamber assembly. After the device is started, the heating wire begins to heat up, and the heat is evenly transferred to each digestion tube through the placement base and PTFE gasket, allowing it to undergo a complete digestion reaction at the set high temperature. During this process, highly corrosive acid mist volatilized from the reaction liquid will diffuse upwards. At this time, two symmetrically arranged acid-resistant fans, supported by fixed fan frames, start rotating, generating a directional airflow above the heating area. This airflow draws in the diffused acid mist through symmetrically opened channels and forces it to the collection chamber at the top via a delivery pipe.

[0015] Based on the aforementioned beneficial effects, this invention ensures that the acid mist inside the collection chamber comes into full contact with the alkaline absorbent cotton fully loaded in the absorbent cotton placement box of the pop-up component. Through an acid-base neutralization reaction, the alkaline absorbent cotton effectively converts the corrosive acidic volatiles into neutral and harmless salts and water, thereby eliminating the corrosive hazards of the acid mist. When it is necessary to replace the absorbent cotton, simply pull up the pressing plate on the outside of the pop-up component with your finger. The pressing plate drives the main locking column to rotate around the fixed axis, overcoming the elasticity of the return spring and causing the locking protrusion at the other end of the main locking column to disengage from the locking groove of the absorbent cotton placement box. Once the locking is released, the previously compressed spring quickly releases its elasticity, pushing the absorbent cotton placement box outward along the slide groove of the slide block, facilitating the replacement of new absorbent cotton. The entire process achieves effective collection and neutralization of acid mist and convenient and safe replacement of consumables, improving the equipment's corrosion resistance and user experience. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a corrosion-resistant COD heating device;

[0017] Figure 2 A three-dimensional anatomical diagram showing the cavity assembly of a corrosion-resistant COD heating device;

[0018] Figure 3 A schematic diagram showing the connection of an acid mist collection component in a corrosion-resistant COD heating device;

[0019] Figure 4 A three-dimensional structural diagram of a corrosion-resistant COD heating device from another perspective;

[0020] Figure 5 This is a schematic cross-sectional view of the internal structure of an acid mist collection component in a corrosion-resistant COD heating device.

[0021] Figure 6 A three-dimensional disassembled schematic diagram of the pop-out component of a corrosion-resistant COD heating device;

[0022] Figure 7 This is a three-dimensional disassembled schematic diagram of the pop-up component of a corrosion-resistant COD heating device.

[0023] In the diagram: 1. Heating frame; 11. Heating wire; 2. Cavity assembly; 21. PTFE gasket; 22. Placement seat; 23. Guide channel; 24. Arc-shaped base; 3. Acid mist collection assembly; 31. Channel; 32. Fixed fan frame; 33. Acid-resistant fan; 34. Delivery pipe; 35. Collection chamber; 4. Pop-up assembly; 41. Slide seat; 42. Slide groove; 43. Fixed post one; 44. Compression spring; 45. Fixed protrusion; 46. Absorbent cotton placement box; 47. Viewing window; 48. Snap-on slot; 49. Groove; 410. Fixed shaft; 411. Snap-on main post; 412. Pressing plate; 413. Snap-on protrusion; 414. Return spring; 415. Fixed post two; 5. Alkaline absorbent cotton. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] Please see Figures 1-2 As shown, this utility model provides a technical solution: a corrosion-resistant COD heating device, including a heating frame 1, a cavity assembly 2 for supporting and uniformly heating the digestion tube at the lower end of the heating frame 1, an acid mist collection assembly 3 for collecting and neutralizing volatile acid mist at the upper end of the heating frame 1, an ejector assembly 4 for supporting and easily replacing the adsorbent material inside the acid mist collection assembly 3, and an alkaline adsorbent cotton 5 for neutralizing acidic volatiles inside the ejector assembly 4.

[0026] As one implementation method in this embodiment, please refer to Figure 2 As shown, heating wires 11 are evenly distributed in the inner cavity of the heating frame 1, and the heating wires 11 are arranged in an S-shape.

[0027] The S-shaped heating wires 11 evenly distributed within the heating frame 1 provide a more uniform heat field distribution compared to traditional straight or coiled wires, reducing heating blind spots and ensuring consistent heating of all digestion tubes. This guarantees the accuracy and reliability of COD determination results for batch samples. This design also avoids sample splashing or digestion tube damage that may result from localized overheating.

[0028] As one implementation method in this embodiment, please refer to Figures 1-2 As shown, the cavity assembly 2 includes a PTFE gasket 21, which is fixedly connected to the inner wall of the heating frame 1. A placement seat 22 is fixedly sleeved on the upper side of the PTFE gasket 21. A guide groove 23 is opened inside the placement seat 22, and multiple arc-shaped bases 24 are opened at the upper end of the placement seat 22.

[0029] The PTFE (polytetrafluoroethylene) gasket in cavity assembly 2, due to its excellent chemical inertness, prevents electrochemical corrosion caused by direct metal-cavity contact. The guide channel 23 on the placement seat 22 is designed to guide liquid to a safe area in the event of accidental spillage, preventing its accumulation and corrosion of equipment circuits or metal components. Multiple arc-shaped bases 24 provide stable support for digestion tubes of different sizes, enhancing operational safety.

[0030] As one implementation method in this embodiment, please refer to Figures 3-5 As shown, the acid mist collection assembly 3 includes channels 31, which are symmetrically opened inside the upper part of the heating frame 1. Fixed fan frames 32 are fixedly connected to the inner side of each of the two channels 31. Acid-resistant fans 33 are rotatably connected to the lower end of each of the two fixed fan frames 32. Conveying pipes 34 are fixedly connected to the upper end of each of the two channels 31. Collection chambers 35 are fixedly connected to the upper end of each of the two conveying pipes 34.

[0031] The acid mist collection component 3, through its symmetrically designed channels 31 and acid-resistant fan 33, forms a negative pressure zone at the top of the device, actively drawing up the acid mist volatilized during the heating process. The acid mist is then guided through the delivery pipe 34 into the upper collection chamber 35, thereby preventing it from spreading throughout the entire equipment and the laboratory environment, fundamentally mitigating the corrosion and harm of acid mist to the instrument and operators.

[0032] As one implementation method in this embodiment, please refer to Figures 6-7 As shown, the pop-out component 4 includes a slide 41, which is fixedly connected to the bottom center area inside the collection cavity 35. Two slide grooves 42 are symmetrically opened on the upper end of the slide 41. Two fixing posts 43 are symmetrically arranged on one side of the inner wall of the collection cavity 35. Compression springs 44 are sleeved on the outer side of the two fixing posts 43. The ends of the two compression springs 44 away from the inner wall of the collection cavity 35 are fixedly connected to fixing protrusions 45.

[0033] As one implementation method in this embodiment, please refer to Figures 6-7 As shown, an absorbent cotton placement box 46 is fixedly connected to the upper end of the two fixed protrusions 45. The absorbent cotton placement box 46 is slidably sleeved on the inner side of the slide block 41. A viewing window 47 is fixedly connected to the outer wall of the absorbent cotton placement box 46 away from the two fixed posts 43. A snap-fit ​​groove 48 is provided at the lower center of the absorbent cotton placement box 46 near the viewing window 47.

[0034] The absorbent cotton placement box 46 is the direct container for holding the alkaline absorbent cotton 5. Its viewing window 47, typically made of polycarbonate, allows users to directly observe the color changes of the absorbent cotton, thus intuitively judging its consumption level and replacement timing. The lower locking groove 48, which engages with the locking protrusion 413, is a key structure for achieving the fixing and release functions.

[0035] As one implementation method in this embodiment, please refer to Figures 6-7 As shown, a slot 49 is provided at the center edge of the slide block 41. A fixed shaft 410 is fixedly connected to the two inner walls of the slot 49 that are close to each other. A snap-fit ​​main post 411 is rotatably sleeved on the outer side of the fixed shaft 410. A pressing plate 412 is fixedly connected to one end of the snap-fit ​​main post 411, and a snap-fit ​​protrusion 413 is fixedly connected to the other end of the snap-fit ​​main post 411 that is away from the pressing plate 412.

[0036] The latching mechanism is the core control component of the pop-out function. The pressing plate 412 is the user's operating end. When pulled upwards, the fixed shaft 410 acts as a fulcrum, causing the latching protrusion 413 at the other end to move downwards, disengaging from the latching groove 48 of the absorbent cotton placement box 46, thereby releasing the lock. The return spring 414 ensures that after the manual pressing operation is completed, the latching main post 411 can automatically return to the initial locked position.

[0037] As one implementation method in this embodiment, please refer to Figures 6-7 As shown, a return spring 414 is fixedly connected to the lower end of the main snap-fit ​​post 411 near the snap-fit ​​protrusion 413. A second fixing post 415 is sleeved inside the return spring 414, and the lower end of the second fixing post 415 is fixedly connected to the bottom center of the slot 49.

[0038] The combination of the return spring 414 and the fixed post 415 provides a stable rotational return force. The fixed post 415 ensures that the spring does not shift during compression and rebound, guaranteeing the accuracy and reliability of the movement of the latching main post 411.

[0039] Working principle: When the device starts working, the digestion tube containing the reagent is placed on the arc-shaped base 24 of the chamber assembly 2. After the device is started, the heating wire 11 begins to heat up, and the heat is evenly transferred to each digestion tube through the placement seat 22 and the PTFE gasket 21, allowing it to carry out a full digestion reaction at the set high temperature. During this process, the highly corrosive acid mist volatilized from the reaction liquid will diffuse upwards. At this time, two symmetrically arranged acid-resistant fans 33 start to rotate under the support of the fixed fan frame 32, generating a directional airflow above the heating area, drawing in the diffused acid mist through the symmetrically opened channels 31, and forcibly transporting it to the collection chamber 35 at the top via the delivery pipe 34.

[0040] Inside the collection chamber 35, the acid mist comes into full contact with the alkaline absorbent cotton 5 fully loaded in the absorbent cotton placement box 46 of the pop-up assembly 4. Through an acid-base neutralization reaction, the alkaline absorbent cotton 5 effectively converts the corrosive acidic volatiles into neutral and harmless salts and water, thus eliminating the corrosive hazards of the acid mist. When it is necessary to replace the absorbent cotton, simply pull up the pressing plate 412 on the outside of the pop-up assembly 4. The pressing plate 412 drives the latching main column 411 to rotate around the fixed shaft 410, overcoming the elasticity of the return spring 414, causing the latching protrusion 413 at the other end of the latching main column 411 to disengage from the latching groove 48 of the absorbent cotton placement box 46. Once the latch is released, the previously compressed compression spring 44 quickly releases its elasticity, pushing the absorbent cotton placement box 46 outward along the slide groove 42 of the slide block 41, facilitating the replacement of new absorbent cotton. The entire process achieves effective collection and neutralization of acid mist and convenient and safe replacement of consumables, improving the equipment's corrosion resistance and user experience.

[0041] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A corrosion resistant COD heating device, characterized by: The device includes a heating frame (1), with a cavity assembly (2) for supporting and uniformly heating the digestion tube at the lower end of the heating frame (1), and an acid mist collection assembly (3) for collecting and neutralizing volatile acid mist at the upper end of the heating frame (1). The acid mist collection assembly (3) has a pop-out assembly (4) for supporting and easily replacing the adsorbent material inside, and an alkaline adsorbent cotton (5) for neutralizing acidic volatiles inside the pop-out assembly (4).

2. The corrosion-proof COD heating device according to claim 1, characterized in that: The heating frame (1) has heating wires (11) evenly distributed in its inner cavity, and the heating wires (11) are arranged in an S-shape.

3. The corrosion-proof COD heating device according to claim 1, characterized in that: The cavity assembly (2) includes a PTFE gasket (21), which is fixedly connected to the inner wall of the heating frame (1). A placement seat (22) is fixedly sleeved on the upper side of the PTFE gasket (21). A guide groove (23) is opened inside the placement seat (22), and multiple arc-shaped bases (24) are opened at the upper end of the placement seat (22).

4. The corrosion-proof COD heating device according to claim 1, characterized in that: The acid mist collection assembly (3) includes channels (31), which are symmetrically opened inside the upper part of the heating frame (1). Fixed fan frames (32) are fixedly connected to the inner side of each of the two channels (31). Acid-resistant fans (33) are rotatably connected to the lower end of each of the two fixed fan frames (32). Conveying pipes (34) are fixedly connected to the upper end of each of the two channels (31). Collection chambers (35) are fixedly connected to the upper end of each of the two conveying pipes (34).

5. The corrosion-proof COD heating device according to claim 4, characterized in that: The ejection assembly (4) includes a slide (41), which is fixedly connected to the bottom center area inside the collection cavity (35). The upper end of the slide (41) is symmetrically provided with two slide grooves (42). The inner wall of the collection cavity (35) is symmetrically provided with two fixing posts (43) on one side. Compression springs (44) are sleeved on the outer side of the two fixing posts (43). The ends of the two compression springs (44) away from the inner wall of the collection cavity (35) are fixedly connected with fixing protrusions (45).

6. The corrosion-proof COD heating device according to claim 5, characterized in that: The upper ends of the two fixed protrusions (45) are fixedly connected to an absorbent cotton placement box (46). The absorbent cotton placement box (46) is slidably sleeved on the inner side of the slide (41). The outer wall of the absorbent cotton placement box (46) away from the two fixed columns (43) is fixedly connected to a viewing window (47). The lower center of the absorbent cotton placement box (46) near the viewing window (47) is provided with a snap-fit ​​groove (48).

7. The corrosion-proof COD heating device according to claim 5, characterized in that: A slot (49) is provided at the center edge of the slide (41). A fixed shaft (410) is fixedly connected to the two inner walls of the slot (49) that are close to each other. A buckle main post (411) is rotatably sleeved on the outer side of the fixed shaft (410). A pressing plate (412) is fixedly connected to one end of the buckle main post (411). A buckle protrusion (413) is fixedly connected to the end of the buckle main post (411) away from the pressing plate (412).

8. The corrosion-proof COD heating device according to claim 7, characterized in that: A return spring (414) is fixedly connected to the lower end of the buckle main post (411) near the buckle protrusion (413). A fixing post (415) is sleeved inside the return spring (414). The lower end of the fixing post (415) is fixedly connected to the bottom center of the slot (49).

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