Efficient cleaning and rapid cooling device for combustion cylinder based on oxygen index

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By designing a device that includes a bottom limiting seat, a support frame, a dust removal filter bag, and a metal purge pipe, a high-pressure airflow is used to achieve efficient cleaning and rapid cooling of the combustion chamber, solving the problems of incomplete cleaning and long cooling time of the combustion chamber, and improving testing efficiency.

CN224261738UActive Publication Date: 2026-05-19ZHUZHOU MINGRI CEMENTED CARBIDE

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: ZHUZHOU MINGRI CEMENTED CARBIDE
Filing Date: 2025-05-14
Publication Date: 2026-05-19

AI Technical Summary

Technical Problem

Existing combustion chamber cleaning methods cannot thoroughly clean the top inner wall, generating smoke and dust that pollute the environment, and the long cooling time affects testing efficiency.

Method used

Design a device including a bottom limiting seat, a support frame, a dust filter bag, an air compressor, and a metal purge pipe. The device achieves efficient cleaning and rapid cooling of the combustion chamber through high-pressure airflow, collects smoke and dust using the dust filter bag, and rapidly reduces the temperature inside the chamber using the metal purge pipe.

Benefits of technology

It achieves efficient cleaning of the combustion chamber inner wall, reduces smoke and dust pollution, shortens cooling time, and improves testing efficiency.

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Abstract

The utility model discloses an efficient cleaning and quick cooling device for a combustion cylinder based on oxygen index, which comprises a bottom limit seat, a support frame, a dust removal filter bag, an air compressor, a hose and a metal purging pipe, the bottom limit seat is provided with a metal outer cylinder and a metal inner cylinder which are concentric, and the inner diameter of the metal outer cylinder is larger than the outer diameter of the bottom of the combustion cylinder; during cleaning, the bottom of the combustion cylinder is inserted between the metal outer cylinder and the metal inner cylinder, a cleaning hole is formed in the position, corresponding to the metal inner cylinder, of the bottom limiting base, the supporting frame is used for supporting the position, close to the top, of the combustion cylinder, and the top of the combustion cylinder is sleeved with the dust removal filter bag. The metal purging pipe is connected with an air outlet port of the air compressor through a hose and used for stretching into the combustion cylinder from the cleaning hole for purging. According to the utility model, the combustion cylinder can be efficiently cleaned, and the combustion cylinder can be cooled while being cleaned, so that the testing efficiency is improved.

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Description

Technical Field

[0001] This utility model relates to the cleaning, combustion dust collection, and rapid cooling technology of the combustion chamber during oxygen index testing, specifically to a high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index testing. Background Technology

[0002] GB / T 2406.2-2009 "Determination of Combustion Behavior of Plastics by Oxygen Index Method - Part 2: Room Temperature Test" is a commonly used method for evaluating the oxygen index value of plastics. This method involves vertically fixing a sample in a transparent combustion chamber with an upward flow of oxygen and nitrogen mixture, igniting the top of the sample, and observing the combustion characteristics of the sample. The continuous combustion time or combustion length of the sample is compared with a given criterion. Through a series of tests at different oxygen concentrations, the minimum oxygen concentration is estimated.

[0003] During the combustion process described above, a large amount of soot is generated and adheres to the inside of the combustion chamber, causing it to blacken. This makes it difficult to clearly and quickly identify from the outside whether the flame has reached the marked position, affecting the judgment of test results. Therefore, the combustion chamber needs to be cleaned after each test. The existing method for cleaning the combustion chamber is roughly as follows: the tester holds the combustion chamber with one hand and uses a cleaning brush in the other hand, inserting the head of the cleaning brush into the bottom of the combustion chamber, and then scraping the soot inside the combustion chamber to achieve cleaning.

[0004] However, the above cleaning methods have the following problems:

[0005] 1. The combustion chamber is relatively long, typically 500mm in length, and the top 701 of the combustion chamber narrows (e.g., Figure 4 As shown, the cleaning brush cannot be inserted directly from the top for cleaning. When the cleaning brush is inserted from the bottom to the top of the combustion chamber for cleaning, due to the long distance, it is difficult to transmit force to the inner end, and the inner wall of the top of the combustion chamber cannot be completely cleaned. After a period of use, dirt accumulates on the inner wall of the top of the combustion chamber, the transparency decreases, and it will affect the judgment of the test results.

[0006] 2. During the cleaning process of the combustion chamber with a cleaning brush, the smoke and dust generated during cleaning will escape from the top port of the combustion chamber, affecting the health of the test personnel and the surrounding environment and equipment;

[0007] 3. During the cleaning process, if you are not careful, the combustion cylinder may slip and break.

[0008] Furthermore, clause 8.3.3 of GB / T 2406.2-2009, "Determination of Combustion Behavior by Oxygen Index Method for Plastics - Part 2: Room Temperature Test," stipulates that the initial temperature of the combustion chamber must be 23℃±2℃ at the start of the test. However, during the test, the heat released by the flame of the burning sample accumulates inside the combustion chamber, causing the gas temperature and the chamber wall temperature to rise. To avoid affecting the results of subsequent tests, the temperature of the combustion chamber needs to be restored to 23℃±2℃ before the next test can be conducted. Current methods typically involve placing the combustion chamber directly in the laboratory environment and waiting for it to recover to the required standard temperature. Restoring the combustion chamber to 23℃±2℃ using this method usually takes about 10 minutes, while a complete limiting oxygen index test requires 10–15 tests. Therefore, the total waiting time for the combustion chamber to recover is 100–150 minutes, which is lengthy and significantly impacts the testing progress. Utility Model Content

[0009] The purpose of this invention is to provide a highly efficient cleaning and rapid cooling device for a combustion chamber based on the oxygen index.

[0010] The objective of this utility model is achieved through the following technical solution:

[0011] A high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index is characterized by comprising a bottom limiting seat, a support frame, a dust removal filter bag, an air compressor, a hose, and a metal purge pipe. The bottom limiting seat has a transverse metal outer cylinder and a metal inner cylinder, which are concentrically fixed. The inner diameter of the metal outer cylinder is larger than the outer diameter of the bottom of the combustion chamber, and the outer diameter of the metal inner cylinder is smaller than the inner diameter of the bottom of the combustion chamber. During cleaning, the bottom of the combustion chamber is inserted between the metal outer cylinder and the metal inner cylinder. A cleaning hole is provided on the bottom limiting seat corresponding to the position of the metal inner cylinder. The support frame is located in front of the bottom limiting seat and is used to support the combustion chamber near the top. The dust removal filter bag is used to cover the top of the combustion chamber. The metal purge pipe is connected to the air outlet port of the air compressor through the hose and is used to extend into the combustion chamber through the cleaning hole for purge.

[0012] A further technical solution of this utility model is: the support frame includes a metal support block, and the upper end of the metal support block is provided with a semi-circular groove, and the position of the combustion cylinder near the top is located in the semi-circular groove during cleaning.

[0013] A further technical solution of this utility model is: the bottom limiting seat is also provided with a metal base plate, the metal outer cylinder and the metal inner cylinder are fixedly welded to the metal base plate, and the cleaning hole is opened on the metal base plate.

[0014] A further technical solution of this utility model is: an elastic band is provided at the opening of the dust removal filter bag, which is used to tighten the dust removal filter bag when it is placed on top of the combustion cylinder.

[0015] A further technical solution of this utility model is that the head of the metal purge tube is tilted to one side.

[0016] A further technical solution of this utility model is that the length of the dust removal filter bag is at least 1m.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention is used in laboratories for oxygen index testing. When cleaning the combustion chamber, the bottom of the combustion chamber is inserted between the outer and inner metal cylinders, and the top of the combustion chamber is supported on a support frame. This allows for quick and stable placement of the combustion chamber. Then, a dust filter bag is placed over the top of the combustion chamber, and the air compressor is started. The metal purge pipe is then inserted into the combustion chamber for cleaning. The impact and shearing forces generated by the compressed air not only efficiently clean the dust adhering to the inner wall of the combustion chamber but also easily clean the dust adhering to the inner top of the combustion chamber. Furthermore, most of the dust that falls during cleaning is collected by the dust filter bag, preventing pollution of the laboratory environment.

[0019] Meanwhile, since the ambient temperature in the laboratory is 23℃, the air temperature blown into the combustion chamber from the metal purge pipe is also 23℃. The high-speed airflow can quickly remove the heat from the combustion chamber, causing the temperature of the combustion chamber itself to eventually drop to 23℃. This achieves the simultaneous cleaning and cooling of the combustion chamber, shortening the combustion chamber cooling time and improving testing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the high-efficiency cleaning and rapid cooling device for the combustion chamber based on the oxygen index according to an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the bottom limiting seat according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the metal purge tube according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the combustion chamber structure according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the efficient cleaning and rapid cooling device for the combustion chamber based on the oxygen index according to an embodiment of the present invention, when cleaning the combustion chamber.

[0025] Meaning of the labels in the attached diagram:

[0026] 100-Dust filter bag; 101-Elastic band; 200-Metal support block; 201-Semi-circular groove; 300-Bottom limit seat; 301-Metal base plate; 302-Metal outer cylinder; 303-Metal inner cylinder; 304-Cleaning hole; 400-Metal purge pipe; 401-Head of metal purge pipe; 402-Tail of metal purge pipe; 500-Hose; 600-Air compressor; 700-Combustion cylinder; 701-Top of combustion cylinder; 702-Bottom of combustion cylinder. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] Example:

[0032] like Figure 1 The above is a high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to this embodiment. It includes a bottom limiting seat 300, a support frame, a dust filter bag 100, an air compressor 600, a hose 500, and a metal purge pipe 400.

[0033] like Figure 2As shown, the bottom limiting seat 300 is provided with a metal base plate 301, a metal outer cylinder 302, and a metal inner cylinder 303. The metal base plate 301 is fixedly installed, and the metal outer cylinder 302 and the metal inner cylinder 303 are fixedly welded to the middle of the metal base plate 301. The metal outer cylinder 302 and the metal inner cylinder 303 are concentric and in a transverse state. The inner diameter of the metal outer cylinder 302 is slightly larger than the outer diameter of the bottom 702 of the combustion cylinder, and the outer diameter of the metal inner cylinder 303 is slightly smaller than the inner diameter of the bottom 702 of the combustion cylinder. During cleaning, the bottom 702 of the combustion cylinder is inserted between the metal outer cylinder 302 and the metal inner cylinder 303, thereby restricting the bottom of the combustion cylinder 700. A cleaning hole 304 is provided in the middle of the metal base plate 301, and the cleaning hole 304 corresponds to the position of the metal inner cylinder 303.

[0034] The specific structure of the bottom limiting seat 300 in this embodiment is as follows: the outer metal cylinder 302 is a circular cylinder with an outer diameter of 85mm, a wall thickness of 3mm, and a length of 50mm; the inner metal cylinder 303 is a circular cylinder with an outer diameter of 70mm, a wall thickness of 3mm, and a length of 100mm; the bottom metal plate 301 is a square plate with a side length of 150mm and a thickness of 5mm; and the bottom plate 304 has a diameter of 10mm.

[0035] The support frame in this embodiment includes a metal support block 200, which is fixedly installed in front of the bottom limiting seat 300. The upper end of the metal support block 200 has a semi-circular groove 201. During cleaning, the combustion cylinder 700 near its top rests in the semi-circular groove 201, thereby supporting the combustion cylinder 700 near its top through the metal support block 200. Specifically, the metal support block 200 is 150mm long, 75mm high, and 50mm wide, and the diameter of the semi-circular groove 201 at the upper end of the metal support block 200 is 75mm.

[0036] The dust collector filter bag 100 has a standard elastic band 101 at its opening. During cleaning, the opening of the dust collector filter bag 100 is placed over the top 701 of the combustion chamber, and the elastic band 101 tightens the opening to prevent dust from leaking out. The dust collector filter bag 100 is made of standard dust-specific filter cloth, and is cylindrical in shape, with a length of at least 1m and a diameter of 200mm.

[0037] One end of the flexible hose 500 is connected to the air outlet of the air compressor 600, and the other end is connected to the tail end 402 of the metal purge pipe. The metal purge pipe 400 is long enough that when the inspector holds the tail end 402 of the metal purge pipe for cleaning, it can be inserted deep enough into the combustion chamber 700. In this embodiment, the head 401 of the metal purge pipe is tilted to one side, so that the high-speed airflow blown from the head 401 of the metal purge pipe can be better directed towards the inner wall of the combustion chamber 700. During cleaning, the metal purge pipe 400 is inserted into the combustion chamber 700 through the cleaning hole 304 for cleaning.

[0038] The air compressor 600 is a conventional machine that can provide high-pressure, high-speed gas, and it can provide compressed air at least 1MPa. The hose 500 has a diameter of 10mm, and the metal purge pipe 400 has a diameter of 10mm and a length of 400mm.

[0039] The method of using the high-efficiency cleaning and rapid cooling device in this embodiment is as follows:

[0040] The high-efficiency cleaning and rapid cooling device is installed in the oxygen index testing laboratory. When in use, the bottom 702 of the tested combustion cylinder is inserted between the metal outer cylinder 302 and the metal inner cylinder 303 of the bottom limiting seat 300, and the combustion cylinder 700 is supported on the metal support block 200 near the top. The opening of the dust removal filter bag 100 is put on the top 701 of the combustion cylinder. Start the air compressor 600 and adjust the compressed air pressure according to the amount of soot adhering inside the combustion chamber 700. Then, hold the tail end 402 of the metal purge pipe and insert it into the combustion chamber 700 through the cleaning port 304 to purge. The high-pressure gas blown out from the head 401 of the metal purge pipe will impact the inner wall of the combustion chamber 700, cleaning the inner wall. The cleaned soot will enter the dust filter bag 100 from the top port of the combustion chamber with the airflow. The dust filter bag 100 collects the soot and filters out most of the soot. A small amount of very small soot that overflows will be discharged from the laboratory through the laboratory ventilation system. The dust filter bag 100 can reduce the impact of soot on the test personnel and the test environment. The laboratory environment temperature is set at 23℃. Therefore, the air temperature continuously blown into the combustion chamber 700 from the metal purge pipe 400 will be 23℃. The high-speed airflow quickly removes heat from the combustion chamber 700, thus simultaneously cleaning and cooling it. Typically, purging the combustion chamber 700 for 1-2 minutes is sufficient to clean its inner wall and rapidly reduce the temperature of the air and the chamber itself to 23℃. After cleaning, the air compressor 600 is turned off, the metal purge pipe 400 is removed, the dust filter bag 100 is removed, and the combustion chamber 700 is removed. The combustion chamber 700, cleaned through this process, can be used directly for the next test without waiting.

[0041] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index, characterized in that: The device includes a bottom limiting seat, a support frame, a dust filter bag, an air compressor, a hose, and a metal purge pipe. The bottom limiting seat has a horizontally oriented outer metal cylinder and an inner metal cylinder, which are concentrically fixed. The inner diameter of the outer metal cylinder is larger than the outer diameter of the bottom of the combustion chamber, and the outer diameter of the inner metal cylinder is smaller than the inner diameter of the bottom of the combustion chamber. During cleaning, the bottom of the combustion chamber is inserted between the outer and inner metal cylinders. A cleaning hole is provided on the bottom limiting seat corresponding to the position of the inner metal cylinder. The support frame is located in front of the bottom limiting seat and is used to support the combustion chamber near the top. The dust filter bag is used to cover the top of the combustion chamber. The metal purge pipe is connected to the air outlet port of the air compressor through the hose and is used to extend into the combustion chamber through the cleaning hole for purge.

2. The high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to claim 1, characterized in that: The support frame includes a metal support block, the upper end of which is provided with a semi-circular groove. During cleaning, the combustion cylinder is positioned near the top within the semi-circular groove.

3. The high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to claim 1, characterized in that: The bottom limiting seat is also provided with a metal base plate, the outer metal cylinder and the inner metal cylinder are fixedly welded to the metal base plate, and the cleaning hole is opened on the metal base plate.

4. The high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to claim 1, characterized in that: The dust filter bag is provided with an elastic band at the bag opening, which is used to tighten the dust filter bag when it is placed on top of the combustion cylinder.

5. The high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to claim 1, characterized in that: The head of the metal purge tube is tilted to one side.

6. The high-efficiency cleaning and rapid cooling device for a combustion chamber based on oxygen index according to claim 1, characterized in that: The length of the dust removal filter bag is at least 1m.