Oxygen cylinder and calorimeter

Abstract

We offer oxygen cylinders with thin walls and light weight. [Solution] An oxygen cylinder comprising a cylinder tube, a cylinder cover, and an oxygen cylinder core, wherein the cylinder tube is a cylindrical body with one end open, the oxygen cylinder core is provided at the open end of the cylinder tube, the cylinder cover is fitted outside the oxygen cylinder core and connected to the cylinder tube, the cylinder tube and cylinder cover are detachably connected, and both the cylinder tube and cylinder cover are made of duplex stainless steel. The oxygen cylinder of the present invention has a thin wall thickness, is lightweight, and has a better heat transfer effect. The present invention further discloses a calorimeter.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion test equipment, and particularly relates to an oxygen cylinder and a calorimeter. This application claims priority based on a Chinese patent application filed with the China National Intellectual Property Administration on March 4, 2024, with an application number of 202410241498.4 and an invention title of "Oxygen Cylinder and Calorimeter", and incorporates all its contents by reference into this application.

Background Art

[0002] An oxygen cylinder is an important component used for the analysis and measurement of the calorific value of combustible substances. It is a sealed container having a combustion chamber capable of containing a combustible substance and oxygen at a certain pressure. In order to accurately and quickly measure the calorific value of a combustible substance, usually, a sample of the combustible substance needs to be placed in the oxygen cylinder and burned. The heated oxygen cylinder transfers heat to water, and the calorific value of the combustible substance is calculated by measuring the rising temperature of this water.

[0003] When the oxygen cylinder operates, it is necessary to fill it with oxygen at 3 MPa. The volume of the oxygen cylinder is between 250 mL and 350 mL. The fuel ignites and burns in the oxygen cylinder, resulting in high temperature, high pressure, and corrosion, and the pressure may reach up to 30 MPa. During measurement, the heat inside the oxygen cylinder needs to be conducted into the calorimeter as quickly as possible. As shown in FIG. 1, the oxygen cylinder is composed of a cylinder barrel 01, a cylinder cover 02, and a sealing ring 03. The weakest part of a general oxygen cylinder structure is in the axial direction of the cylinder barrel 01. To analyze the force on the cylinder wall of the cylinder barrel 01, it is only necessary to analyze the axial force on the cylinder barrel 01. The maximum pressure that the cylinder wall of the cylinder barrel 01 can withstand is below half of the yield strength σs of the material, ensuring the safety performance of the oxygen cylinder. Conventional oxygen cylinders generally use ordinary austenitic stainless steels, such as SUN304 and SUN316. The yield strength of the material is small, the wall thickness of the cylinder barrel 01 is 5 mm to 6 mm, the wall thickness and inner radius are relatively large, the overall weight of the oxygen cylinder becomes large, and it is inconvenient to use.

Summary of the Invention

[0004] As described above, providing oxygen cylinders with thinner walls and lighter weight is a technical challenge that those skilled in the art must address urgently. [Means for solving the problem]

[0005] In view of this, the present invention provides an oxygen cylinder with a thin wall thickness, light weight, and better heat transfer effect.

[0006] The present invention further provides a calorimeter.

[0007] To achieve the above objective, the present invention provides the following technical solutions.

[0008] An oxygen cylinder comprising a cylinder tube, a cylinder cover, and an oxygen cylinder core, wherein the cylinder tube is a cylindrical body with one end open, the oxygen cylinder core is provided at the open end of the cylinder tube, the cylinder cover is fitted outside the oxygen cylinder core and connected to the cylinder tube, the cylinder tube and cylinder cover are detachably connected, and both the cylinder tube and cylinder cover are made of duplex stainless steel.

[0009] Alternatively, the system further includes stacked first and second seal rings, the first and second seal rings being located within a seal chamber surrounded by a cylinder, a cylinder cover, and an oxygen cylinder core.

[0010] Alternatively, the first seal ring and the second seal ring are both annular seal rings. The first seal ring and the second seal ring are fitted onto the oxygen cylinder core, and the oxygen cylinder core is provided with support bosses that support the first seal ring and the second seal ring, with the outer side of the support bosses in contact with the inner wall of the cylinder.

[0011] Alternatively, the cross-section of the first seal ring may be circular, and the cross-section of the second seal ring may be rectangular. The bottom end of the first seal ring contacts the support boss, and the top end of the second seal ring contacts the inner wall of the cylinder cover. The first seal ring and the second seal ring have their inner surfaces in contact with the oxygen cylinder core and their outer surfaces in contact with the inner wall of the cylinder.

[0012] Alternatively, the cross-section of the first seal ring is provided with a V-shaped opening, and the cross-section of the second seal ring is rectangular. The V-shaped opening end of the first seal ring contacts the support boss, and the top end of the second seal ring contacts the inner wall of the cylinder cover. The first seal ring and the second seal ring have their inner surfaces in contact with the oxygen cylinder core and their outer surfaces in contact with the inner wall of the cylinder.

[0013] Alternatively, the cylinder is cylindrical, and the cylinder and cylinder cover are screwed together.

[0014] Alternatively, the wall thickness of the cylinder is 4mm to 4.5mm.

[0015] Alternatively, the material of the cylinder and cylinder cover is 2507 stainless steel.

[0016] Alternatively, the yield strength of the aforementioned duplex stainless steel material is 400 MPa to 550 MPa.

[0017] As can be seen from the above technical proposal, the oxygen cylinder provided by the present invention uses duplex stainless steel for both the cylinder tube and the cylinder cover. Duplex stainless steel has much higher tensile strength and yield strength than ordinary stainless steel. Under the same operating pressure conditions, the thickness of duplex stainless steel is thinner than that of ordinary stainless steel, and because the density of duplex stainless steel is slightly lower than that of ordinary stainless steel, the weight is significantly reduced. The thermal conductivity of duplex stainless steel is close to that of ordinary stainless steel, and under conditions that meet equivalent needs, the heat transfer power of duplex stainless steel is higher due to the thinner wall thickness of the duplex stainless steel material. Compared to conventional oxygen cylinders made of ordinary stainless steel, the oxygen cylinder of the present invention has a thinner wall thickness, is lighter, and has better heat transfer effect.

[0018] The present invention further provides a calorimeter comprising a cylindrical body and an oxygen cylinder, wherein the oxygen cylinder is provided inside the cylindrical body, and the oxygen cylinder is the above-described oxygen cylinder, and therefore has the beneficial effects of the above-described oxygen cylinder, which will not be further elaborated here. [Brief explanation of the drawing]

[0019] To more clearly illustrate embodiments of the present invention or technical concepts in the prior art, the following briefly introduces the drawings necessary for describing embodiments or the prior art. Clearly, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can use other drawings corresponding to these, provided they do not perform work worthy of inventive step. [Figure 1] This is a schematic diagram of the structure of an oxygen cylinder in conventional technology. [Figure 2] This is a schematic diagram of the structure of an oxygen cylinder provided by an embodiment of the present invention. [Figure 3] This is a schematic diagram of the sealing structure of the cylinder and cylinder cover position of an oxygen cylinder provided by one embodiment of the present invention. [Figure 4] This is a schematic diagram of the sealing structure of the cylinder cylinder and cylinder cover position of an oxygen cylinder provided by another embodiment of the present invention. [Figure 5]It is a structural schematic diagram of one angle of the first seal ring in FIG. 4.

Embodiments for Carrying out the Invention

[0020] The present invention discloses an oxygen cylinder, which has a thin wall thickness, a light weight, and a better heat transfer effect.

[0021] The present invention further discloses a calorimeter.

[0022] Hereinafter, in combination with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative labor shall fall within the protection scope of the present invention.

[0023] Referring to FIG. 2, for the oxygen cylinder of the present invention, it includes a cylinder body 1, a cylinder cover 2, and an oxygen cylinder core 3. The cylinder body 1 is a cylinder with one end open. The oxygen cylinder core 3 is provided at the open end of the cylinder body 1. The cylinder cover 2 is externally inserted outside the oxygen cylinder core 3 and connected to the cylinder body 1. The cylinder body 1 and the cylinder cover 2 are detachably connected. Both the cylinder body 1 and the cylinder cover 2 are made of duplex stainless steel.

[0024] The duplex stainless steel material is a kind of stainless steel that combines ferritic stainless steel and austenitic stainless steel. It has a two-phase structure of austenite and ferrite and has the characteristic points of both austenitic stainless steel and ferritic stainless steel. The characteristic point of the duplex stainless steel material is that its yield strength is high. Specifically, the yield strength of the duplex stainless steel material is 400 Mpa to 550 Mpa. It is twice that of ordinary austenitic stainless steel, and at the same time, it retains the characteristic of high thermal conductivity of ferrite and is close to austenitic stainless steel in corrosion resistance performance.

[0025] In the oxygen cylinder of the present invention, both the cylinder tube 1 and the cylinder cover 2 are made of duplex stainless steel. Duplex stainless steel has much higher tensile strength and yield strength than ordinary stainless steel. Under the same operating pressure conditions, the thickness of duplex stainless steel is thinner than that of ordinary stainless steel, and because the density of duplex stainless steel is slightly lower than that of ordinary stainless steel, the weight is significantly reduced. The heat transfer power of duplex stainless steel is close to that of ordinary stainless steel, and in situations where equivalent needs are met, the heat transfer rate of duplex stainless steel is higher due to the thinner wall thickness of the duplex stainless steel material. Compared to conventional oxygen cylinders made of ordinary stainless steel, the oxygen cylinder of the present invention has a thinner wall thickness, is lighter, and has better heat transfer effect.

[0026] To improve the sealing performance of the oxygen cylinder, the oxygen cylinder of the present invention further includes stacked first seal rings 4 and second seal rings 5, which are stacked along the axial direction of the cylinder tube 1. To facilitate the storage of the seal rings, a support boss 301 is provided at one end of the oxygen cylinder core 3 near the inner chamber of the cylinder tube 1, the outer diameter of which is larger than the diameter of the other part of the oxygen cylinder core 3, and the outside of the support boss 301 is in contact with the inner wall of the cylinder tube 1, thereby enclosing an annular seal chamber between the cylinder tube 1, the cylinder cover 2 and the oxygen cylinder core 3, and the first seal rings 4 and second seal rings 5 ​​are provided within the seal chamber, forming a seal structure. Both the first seal rings 4 and second seal rings 5 ​​are annular seal rings, and both the first seal rings 4 and second seal rings 5 ​​are supported by the support boss 301.

[0027] In one embodiment, as shown in Figure 3, the cross-section of the first seal ring 4 is circular, and the cross-section of the second seal ring 5 is rectangular. The bottom end of the first seal ring 4 contacts the support boss 301 of the oxygen cylinder core 3, and the top end of the second seal ring 5 contacts the inner wall of the cylinder cover 2. The bottom end of the first seal ring 4 refers to the end closer to the inner chamber of the cylinder 1, and the top end of the second seal ring 5 refers to the end further away from the inner chamber of the cylinder 1. For definitions of the bottom end and top end, one can also refer to the positional relationship in the state shown in Figure 2. To understand that in order to improve sealing performance, the first seal ring 4 and the second seal ring 5 are in contact with the side wall of the oxygen cylinder core 3 on the inside and with the inner wall of the cylinder 1 on the outside.

[0028] In another embodiment, as shown in Figure 4, the cross-section of the first seal ring 4 is provided with a V-shaped opening, and Figure 5 is a schematic diagram of the structure of the V-shaped opening end of the first seal ring 4. By providing the first seal ring 4 with the V-shaped opening, the incoming high-temperature airflow is restricted to the V-shaped opening region of the first seal ring 4, and the high-temperature airflow presses against the two sides of the V-shaped opening region, so that the inner side of the V-shaped opening is pressed against the side wall of the oxygen cylinder core 3 and the outer side is pressed against the inner wall of the cylinder 1, thereby greatly improving the sealing performance. The cross-section of the second seal ring 5 is rectangular and provides axial support for the first seal ring 4. To understand, the V-shaped opening end of the first seal ring 4 is in contact with the support boss 301, i.e., it is located close to the inner chamber of the cylinder 1, and the top end of the second seal ring 5 is in contact with the inner wall of the cylinder cover 2. The first seal ring 4 and the second seal ring 5 have their inner sides in contact with the side wall of the oxygen cylinder core 3 and their outer sides in contact with the inner wall of the cylinder barrel 1.

[0029] The cylinder 1 is cylindrical, and a male thread is provided on the outer surface near the opening of the cylinder 1. The cylinder cover 2 has a female thread on the side corresponding to the male thread of the cylinder 1, and the cylinder 1 and cylinder cover 2 are screwed together, making them easy to attach and detach.

[0030] Furthermore, the wall thickness of cylinder 1 is 4mm to 4.5mm. The material of cylinder 1 and cylinder cover 2 is 2507.

[0031] In one embodiment, the wall thickness of the cylinder 1 is 4 mm.

[0032] For the comparative testing of oxygen cylinders made of different materials, one oxygen cylinder was made of 316L ordinary stainless steel, with both the cylinder tube 1 and cylinder cover 2 being made of 316L. The other oxygen cylinder was made of 2507 duplex stainless steel, with both the cylinder tube 1 and cylinder cover 2 being made of 2507. Both oxygen cylinders had the same volume, 300mL, and their external shape, operating pressure (30MPa), other components, and operating environment were identical. However, the wall thickness of the cylinder tube 1 differed between the two; the 316L oxygen cylinder had a wall thickness of 5.5mm, while the 2507 oxygen cylinder had a wall thickness of 4mm. The test indicators for both are shown in Table 1.

[0033] [Table 1]

[0034] Under the same operating pressure conditions, an oxygen cylinder made of 2507 material can have a wall thickness 1.5 mm thinner, and its density is slightly lower than that of ordinary stainless steel, thus significantly reducing its weight. The thermal conductivity of 316L material and 2507 material are similar, and the heat transfer performance is inversely proportional to the thickness; that is, the thicker the wall, the worse the heat transfer performance, and the thinner the wall, the better the heat transfer performance. Therefore, the heat transfer performance of an oxygen cylinder made of 2507 material is better. As can be seen from the data in Table 1, the weight of the oxygen cylinder made of 2507 material is reduced by 24%, to only 76% of the original, making it easier for the user to handle and use. The heat capacity of the oxygen cylinder is reduced by 25%, to only 75% of the original, the heat transfer power is increased by 46%, the main test period is reduced by more than 10%, the overall test time is reduced by approximately 1.5 minutes, and the lower limit of the measurement range for thermal measurement of the oxygen cylinder made of 2507 material is expanded.

[0035] In the oxygen cylinder of the present invention, the main components of the oxygen cylinder, the cylinder tube 1 and the cylinder cover 2, are made of duplex stainless steel to improve the pressure resistance performance of the oxygen cylinder, reduce the weight of the oxygen cylinder, improve the heat transfer performance of the oxygen cylinder, and expand the thermal test range.

[0036] The present invention further provides a calorimeter comprising a cylindrical body and an oxygen cylinder, wherein the oxygen cylinder is provided inside the cylindrical body, and the oxygen cylinder is the above-described oxygen cylinder.

[0037] In the description of this invention, the directions or positional relationships indicated by terms such as "up," "down," "vertical," "inside," and "outside" are directions or positional relationships shown based on the drawings, and are merely for the convenience of describing the invention and simplifying the description. It is not intended to indicate or imply that the mentioned devices or elements have a specific direction or must be configured and operated in a specific direction, and therefore should not be understood as limiting this invention.

[0038] Each example in this specification is described in a progressive manner, with each example focusing on aspects that differentiate it from others. Similar or identical parts between examples should be referenced to one another.

[0039] The above description of the disclosed embodiments will enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention is not limited to these embodiments shown herein, but extends to the broadest extent that is consistent with the principles and novel features disclosed herein. [Explanation of symbols]

[0040] 01 Cylinder 02 Cylinder cover 03 Seal ring 1 cylinder 2. Cylinder cover 3. Oxygen cylinder core 301 Supporting Boss 4. First seal ring 5. Second sealing ring

Claims

1. An oxygen cylinder comprising a cylinder tube, a cylinder cover, and an oxygen cylinder core, wherein the cylinder tube is a cylindrical body with one end open, the oxygen cylinder core is provided at the open end of the cylinder tube, and the cylinder cover is fitted outside the oxygen cylinder core and connected to the cylinder tube, The cylinder and the cylinder cover are detachably connected, and both the cylinder and the cylinder cover are made of duplex stainless steel. An oxygen cylinder characterized by the following features.

2. Further including stacked first and second seal rings, the first and second seal rings are provided within a seal chamber surrounded by a cylinder, a cylinder cover, and an oxygen cylinder core. The oxygen cylinder according to feature 1.

3. The first seal ring and the second seal ring are both annular seal rings. The first seal ring and the second seal ring are fitted onto the oxygen cylinder core, and the oxygen cylinder core is provided with support bosses that support the first seal ring and the second seal ring, and the outer side of the support bosses is in contact with the inner wall of the cylinder. The oxygen cylinder according to feature 2.

4. The cross-section of the first seal ring is circular, and the cross-section of the second seal ring is rectangular. The bottom end of the first seal ring contacts the support boss, and the top end of the second seal ring contacts the inner wall of the cylinder cover. The first seal ring and the second seal ring have their inner surfaces in contact with the oxygen cylinder core and their outer surfaces in contact with the inner wall of the cylinder. The oxygen cylinder according to feature 3.

5. The cross-section of the first seal ring is provided with a V-shaped opening, and the cross-section of the second seal ring is rectangular. The V-shaped opening end of the first seal ring contacts the support boss, and the top end of the second seal ring contacts the inner wall of the cylinder cover. The first seal ring and the second seal ring have their inner surfaces in contact with the oxygen cylinder core and their outer surfaces in contact with the inner wall of the cylinder. The oxygen cylinder according to feature 3.

6. The cylinder is cylindrical, and the cylinder and the cylinder cover are screwed together. The oxygen cylinder according to feature 1.

7. The wall thickness of the cylinder is 4 mm to 4.5 mm. The oxygen cylinder according to feature 1.

8. The material of the aforementioned cylinder and cylinder cover is 2507 stainless steel. The oxygen cylinder according to feature 1.

9. The yield strength of the aforementioned duplex stainless steel material is 400 MPa to 550 MPa. The oxygen cylinder according to feature 1.

10. A calorimeter comprising a cylindrical body and an oxygen cylinder, wherein the oxygen cylinder is provided inside the cylindrical body, and the oxygen cylinder is an oxygen cylinder according to any one of claims 1 to 9. A calorimeter characterized by the following features.

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