Oxygen bomb and calorimeter

Abstract

An oxygen bomb, comprising a bomb cylinder, a bomb cover and an oxygen bomb core. The bomb cylinder is a cylinder body having an opening at one end, the oxygen bomb core being arranged at the opening end of the bomb cylinder; the bomb cover is sleeved outside the oxygen bomb core and connected to the bomb cylinder; the bomb cylinder and the bomb cover are detachably connected to each other, and are both made of a duplex stainless steel material. The oxygen bomb of the present invention has a small wall thickness, light weight and a better heat conduction effect. Further disclosed in the present invention is a calorimeter.

Description

An oxygen bomb and calorimeter

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on March 4, 2024, with application number 202410241498.4 and invention name “An Oxygen Bomb and Calorimeter”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of combustion experimental instruments, in particular to an oxygen bomb and a calorimeter. Background Art

[0003] An oxygen bomb is a key component used for analyzing and measuring the calorific value of combustible materials. It is a sealed container with a combustion chamber that holds the combustible material and oxygen at a certain pressure. To accurately and quickly measure the calorific value of a combustible material, a sample of the material is typically placed in the bomb and burned. The heated oxygen bomb transfers heat to water, and the temperature rise of the water is measured to calculate the calorific value of the combustible material.

[0004] When operating, an oxygen bomb requires a 3MPa oxygen charge. The bomb's volume ranges from 250mL to 350mL. The fuel ignites and burns within the bomb, generating high temperatures, high pressures, and corrosiveness, with pressures reaching as high as 30MPa. During measurement, the heat within the bomb must be transferred to the calorimeter as quickly as possible. As shown in Figure 1, the bomb consists of a barrel 01, a cover 02, and a sealing ring 03. The weakest point in the typical oxygen bomb structure is the axial direction of the barrel 01. Analyzing the forces acting on the barrel's walls requires only analyzing the axial direction. The maximum pressure to which the barrel's walls can be subjected must not exceed half the material's yield strength, σs, to ensure the bomb's safety. Existing oxygen bombs commonly use conventional austenitic stainless steel, such as SUN304 and SUN316, which have low yield strength. The barrel's wall thickness is 5mm to 6mm, which is relatively large relative to the inner radius. This results in a heavy overall weight and inconvenience.

[0005] In summary, how to provide an oxygen bomb with thin walls and light weight has become a technical problem that needs to be solved urgently by those skilled in the art.

[0006] Summary of the Invention

[0007] In view of this, the present invention provides an oxygen bomb with thinner wall thickness, lighter weight and better heat conduction effect.

[0008] The present invention also provides a calorimeter.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An oxygen bomb comprises a barrel, a cover and an oxygen core. The barrel is a cylindrical body with one end open. The oxygen core is arranged at the open end of the barrel. The cover is sleeved over the oxygen core and connected to the barrel. The barrel and the cover are detachably connected. Both the barrel and the cover are made of duplex stainless steel.

[0011] Optionally, it further comprises a first sealing ring and a second sealing ring stacked together, wherein the first sealing ring and the second sealing ring are arranged in a sealed chamber surrounded by the cartridge case, the cartridge cover and the oxygen cartridge core.

[0012] Optionally, the first sealing ring and the second sealing ring are both annular sealing rings;

[0013] The first sealing ring and the second sealing ring are sleeved on the oxygen bomb core. The oxygen bomb core is provided with a supporting boss for supporting the first sealing ring and the second sealing ring. The outer side of the supporting boss contacts the inner side wall of the bomb barrel.

[0014] Optionally, the cross section of the first sealing ring is circular, and the cross section of the second sealing ring is rectangular;

[0015] The bottom end of the first sealing ring contacts the supporting boss, and the top end of the second sealing ring contacts the inner wall of the elastic cover;

[0016] The inner sides of the first sealing ring and the second sealing ring are in contact with the oxygen bomb core, and the outer sides are in contact with the inner side wall of the bomb barrel.

[0017] Optionally, the cross section of the first sealing ring is provided with a V-shaped opening, and the cross section of the second sealing ring is rectangular;

[0018] The V-shaped opening end of the first sealing ring contacts the supporting boss, and the top end of the second sealing ring contacts the inner wall of the elastic cover;

[0019] The inner sides of the first sealing ring and the second sealing ring are in contact with the oxygen bomb core, and the outer sides are in contact with the inner side wall of the bomb barrel.

[0020] Optionally, the cartridge is a cylindrical cartridge, and the cartridge and the cartridge cover are threadedly connected.

[0021] Optionally, the wall thickness of the cartridge is 4 mm to 4.5 mm.

[0022] Optionally, the material of the cartridge case and the cartridge cover is 2507.

[0023] Optionally, the yield strength of the duplex stainless steel material is 400 MPa to 550 MPa.

[0024] As can be seen from the above technical solution, the oxygen bomb provided by the present invention, including its barrel and cover, is made of duplex stainless steel. Because duplex stainless steel has much higher tensile and yield strengths than ordinary stainless steel, it is thinner than ordinary stainless steel under the same operating pressure conditions. Furthermore, its density is slightly lower than that of ordinary stainless steel, resulting in a significant weight reduction. The thermal conductivity of duplex stainless steel is similar to that of ordinary stainless steel. Because duplex stainless steel has a thinner wall thickness while meeting the same requirements, it offers higher thermal conductivity. Compared to conventional oxygen bombs made of ordinary stainless steel, the oxygen bomb of the present invention has thinner walls, is lighter, and offers better thermal conductivity.

[0025] The present invention also provides a calorimeter, comprising a cylinder and an oxygen bomb, wherein the oxygen bomb is arranged in the cylinder. The oxygen bomb is the above-mentioned oxygen bomb, and therefore has the beneficial effects of the above-mentioned oxygen bomb, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] FIG1 is a schematic structural diagram of an oxygen bomb in the prior art;

[0028] FIG2 is a schematic structural diagram of an oxygen bomb provided in an embodiment of the present invention;

[0029] FIG3 is a schematic diagram of the sealing structure of the cylinder and cover of an oxygen bomb provided in one embodiment of the present invention;

[0030] FIG4 is a schematic diagram of the sealing structure of the cylinder and cover of an oxygen bomb provided by another embodiment of the present invention;

[0031] FIG5 is a schematic structural diagram of the first sealing ring in FIG4 at an angle.

[0032] in:

[0033] 01. Cylinder; 02. Cover; 03. Sealing ring;

[0034] 1. Cylinder;

[0035] 2. Spring cover;

[0036] 3. Oxygen bomb core;

[0037] 301, support boss;

[0038] 4. The first sealing ring;

[0039] 5. Second sealing ring. DETAILED DESCRIPTION

[0040] The invention discloses an oxygen bomb with thinner wall thickness, lighter weight and better heat conduction effect.

[0041] The invention also discloses a calorimeter.

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Referring to Figure 2, the oxygen bomb of the present invention comprises a barrel 1, a cover 2, and an oxygen core 3. The barrel 1 is an open-ended cylinder, with the oxygen core 3 disposed at the open end. The cover 2 is sleeved over the oxygen core 3 and connected to the barrel 1. The barrel 1 and cover 2 are detachably connected and are both made of duplex stainless steel.

[0044] Duplex stainless steel is a combination of ferritic and austenitic stainless steels, possessing a dual-phase microstructure of austenite and ferrite, combining the characteristics of both austenitic and ferritic stainless steels. Duplex stainless steel is characterized by its high yield strength, specifically 400-550 MPa. This is twice that of ordinary austenitic stainless steel, while retaining the high thermal conductivity of ferrite, and its corrosion resistance approaches that of austenitic stainless steel.

[0045] The oxygen bomb of the present invention, including its barrel 1 and cover 2, is made of duplex stainless steel. Because duplex stainless steel has significantly higher tensile and yield strengths than ordinary stainless steel, it is thinner and slightly less dense than ordinary stainless steel under the same operating pressure conditions, significantly reducing weight. The thermal conductivity of duplex stainless steel is similar to that of ordinary stainless steel. Because duplex stainless steel has thinner walls while meeting the same requirements, it has a higher thermal conductivity. Compared to conventional oxygen bombs made of ordinary stainless steel, the oxygen bomb of the present invention has thinner walls, is lighter, and offers better thermal conductivity.

[0046] To improve the oxygen bomb's sealing performance, the oxygen bomb of the present invention further includes a stacked first sealing ring 4 and a second sealing ring 5, which are stacked axially along the barrel 1. To facilitate accommodating the sealing rings, a support boss 301 is provided at one end of the oxygen core 3, adjacent to the inner cavity of the barrel 1. The outer diameter of the support boss 301 is larger than the diameter of the rest of the oxygen core 3. The outer side of the support boss 301 contacts the inner sidewall of the barrel 1, thereby forming an annular sealed chamber between the barrel 1, the cover 2, and the oxygen core 3. The first sealing ring 4 and the second sealing ring 5 are disposed within this sealed chamber, forming a sealed structure. The first and second sealing rings 4 and 5 are both annular sealing rings, supported by the support boss 301.

[0047] In one embodiment, as shown in Figure 3 , the first sealing ring 4 has a circular cross-section, while the second sealing ring 5 has a rectangular cross-section. The bottom end of the first sealing ring 4 contacts the support boss 301 on the oxygen core 3, while the top end of the second sealing ring 5 contacts the inner wall of the cover 2. The bottom end of the first sealing ring 4 refers to the end closest to the inner cavity of the cylinder 1, while the top end of the second sealing ring 5 refers to the end further from the inner cavity of the cylinder 1. The definitions of the bottom and top ends can also refer to the positional relationship in Figure 2 . It will be appreciated that to improve sealing performance, the inner sides of the first and second sealing rings 4 and 5 contact the side walls of the oxygen core 3, while the outer sides contact the inner wall of the cylinder 1.

[0048] In another embodiment, as shown in FIG4 , the cross-section of the first sealing ring 4 is provided with a V-shaped opening. FIG5 is a schematic structural diagram of the V-shaped opening end of the first sealing ring 4. By providing the first sealing ring 4 with such a V-shaped opening, the incoming high-temperature airflow is confined to the V-shaped opening region of the first sealing ring 4. The high-temperature airflow presses against the two sides of the V-shaped opening region, causing the inner side of the V-shaped opening to press against the side wall of the oxygen core 3 and the outer side to press against the inner side wall of the barrel 1, thereby greatly improving the sealing performance. The second sealing ring 5 has a rectangular cross-section and provides axial support for the first sealing ring 4. As will be understood, the V-shaped opening end of the first sealing ring 4 contacts the support boss 301, i.e., is positioned near the inner cavity of the barrel 1, while the top end of the second sealing ring 5 contacts the inner wall of the cover 2. Specifically, the inner sides of the first and second sealing rings 4, 5 contact the side walls of the oxygen core 3, and the outer sides contact the inner side wall of the barrel 1.

[0049] Among them, the cartridge barrel 1 is a cylindrical barrel, and the outer surface of the cartridge barrel 1 near the opening is provided with an external thread, and the side of the cartridge cover 2 corresponding to the external thread on the cartridge barrel 1 is provided with an internal thread. The cartridge barrel 1 and the cartridge cover 2 are threadedly connected, so as to facilitate disassembly and assembly.

[0050] Furthermore, the wall thickness of the cartridge case 1 is 4 mm to 4.5 mm. The cartridge case 1 and the cartridge cover 2 are made of 2507 stainless steel.

[0051] In one embodiment, the wall thickness of the barrel 1 is 4 mm.

[0052] Tests comparing oxygen bombs made of different materials were conducted. One bomb was made of standard 316L stainless steel, with both its barrel 1 and cap 2 made of 316L. The other bomb was made of duplex 2507 stainless steel, with both its barrel 1 and cap 2 made of 2507. Both bombs had the same volume of 300mL, identical appearance, operating pressure (30MPa), other components, and operating environments. However, the wall thickness of the barrel 1 differed: the 316L bomb had a wall thickness of 5.5mm, while the 2507 bomb had a wall thickness of 4mm. The test specifications for both are shown in Table 1.

[0053] Table 1

[0054] Under the same operating pressure, the wall thickness of the 2507 oxygen bomb can be made 1.5mm thinner, and its density is slightly lower than that of ordinary stainless steel, resulting in a significant weight reduction. Since the thermal conductivity of 316L and 2507 is similar, and thermal conductivity is inversely proportional to thickness—thicker walls result in poorer thermal conductivity, while thinner walls result in better thermal conductivity—the 2507 oxygen bomb offers superior thermal conductivity. As shown in Table 1, the weight of the 2507 oxygen bomb has been reduced by 24%, to only 76% of the original weight, making it easier for users to handle. The heat capacity of the bomb has been reduced by 25%, to only 75% of the original weight. The thermal conductivity has increased by 46%, reducing the test period by over 10% and the overall test time by approximately 1.5 minutes. The 2507 oxygen bomb also extends the lower limit of the calorimetric measurement range.

[0055] The oxygen bomb of the present invention uses duplex stainless steel for its main parts, namely, the barrel 1 and the cover 2, to improve the compression resistance of the oxygen bomb, reduce the weight of the oxygen bomb, improve the thermal conductivity of the oxygen bomb, and expand the thermal test range.

[0056] The present invention also provides a calorimeter, comprising a cylinder and an oxygen bomb, wherein the oxygen bomb is arranged in the cylinder, and the oxygen bomb is the above-mentioned oxygen bomb.

[0057] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on this solution.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0059] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oxygen bomb, comprising a barrel, a cover, and an oxygen core, wherein the barrel is a cylindrical body with one end open, the oxygen core is arranged at the open end of the barrel, and the cover is sleeved over the oxygen core and connected to the barrel, characterized in that: The cartridge case and the cartridge cover are detachably connected, and both the cartridge case and the cartridge cover are made of duplex stainless steel.

2. The oxygen bomb according to claim 1, characterized in that It also includes a first sealing ring and a second sealing ring stacked together, wherein the first sealing ring and the second sealing ring are arranged in a sealed chamber surrounded by the cartridge case, the cartridge cover and the oxygen cartridge core.

3. The oxygen bomb according to claim 2, characterized in that The first sealing ring and the second sealing ring are both annular sealing rings; The first sealing ring and the second sealing ring are sleeved on the oxygen bomb core. The oxygen bomb core is provided with a supporting boss for supporting the first sealing ring and the second sealing ring. The outer side of the supporting boss contacts the inner side wall of the bomb barrel.

4. The oxygen bomb according to claim 3, characterized in that The cross section of the first sealing ring is circular, and the cross section of the second sealing ring is rectangular; The bottom end of the first sealing ring contacts the supporting boss, and the top end of the second sealing ring contacts the inner wall of the elastic cover; The inner sides of the first sealing ring and the second sealing ring are in contact with the oxygen bomb core, and the outer sides are in contact with the inner side wall of the bomb barrel.

5. The oxygen bomb according to claim 3, characterized in that The cross section of the first sealing ring is provided with a V-shaped opening, and the cross section of the second sealing ring is rectangular; The V-shaped opening end of the first sealing ring contacts the supporting boss, and the top end of the second sealing ring contacts the inner wall of the elastic cover; The inner sides of the first sealing ring and the second sealing ring are in contact with the oxygen bomb core, and the outer sides are in contact with the inner side wall of the bomb barrel.

6. The oxygen bomb according to claim 1, characterized in that The cartridge case is a cylindrical barrel, and the cartridge case and the cartridge cover are threadedly connected.

7. The oxygen bomb according to claim 1, characterized in that The wall thickness of the cartridge is 4 mm to 4.5 mm.

8. The oxygen bomb according to claim 1, characterized in that The material of the cartridge case and cartridge cover is 2507.

9. The oxygen bomb according to claim 1, characterized in that The yield strength of the duplex stainless steel material is 400 MPa to 550 MPa.

10. A calorimeter comprising a cylinder and an oxygen bomb, wherein the oxygen bomb is disposed in the cylinder, characterized in that: The oxygen bomb is the oxygen bomb according to any one of claims 1 to 9.

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