Vacuum cavity capable of being used in vacuum low-background environment
By designing a vacuum chamber system including a vacuum chamber main body, cooling chamber, control pump and liquid nitrogen tank, the problem of high-precision and wide-temperature zone temperature regulation in low vacuum background environments in aerospace fields is solved, and the high-precision and low-consumption temperature regulation effect is achieved.
Patent Information
- Application Number
- CN202411683400.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-04-11
AI Technical Summary
In the fields of aerospace, there is an urgent need for temperature calibration of low-temperature combustion aids and an increasing demand for miniaturization and intelligence. It is difficult for the prior art to achieve high-precision and wide-temperature temperature regulation in low vacuum background environments.
A vacuum chamber system including a vacuum chamber main body, a cooling chamber, a control pump and a liquid nitrogen tank is designed. By controlling the pump, the temperature adjustment of the cooling chamber and the vacuum chamber main body is realized. The cooling chamber adopts a "squirrel cage" design, using a cylindrical structure made of copper plate roll and a copper tube refrigeration tube, combining axial and radial limit blocks to ensure the stability and effectiveness of the refrigeration tube.
It realizes high-precision temperature regulation in a low vacuum background environment, with low consumption and wide temperature range. It is suitable for aerospace remote sensing and other fields, making up for the shortcomings of existing equipment.
Smart Images
Figure CN119803766A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of thermal metrology, and in particular to a vacuum chamber that can be used in a vacuum low-background environment. Background Art
[0002] In the fields of aerospace, nuclear physics, biomedicine, etc., due to the wide attention paid to some excellent low-temperature properties of materials, the related low-temperature technology has been applied to many industries. For example, in the aerospace system, low-temperature liquid hydrogen is used as a clean and efficient fuel in rocket systems; in the nuclear energy system, ultra-low temperature constant temperature technology is used to control nuclear reactors; in the biomedical field, low-temperature liquids are used to preserve biological samples. With the continuous development of related technologies such as space exploration, cryogenic engineering, gas industry and scientific experiments in my country, the demand for low-temperature calibration is also increasing. Especially in the aerospace field, the demand for temperature calibration of low-temperature combustion aids is extremely urgent, and the demand for miniaturization and intelligence is getting higher and higher. Vacuum is an indicator of the rarefaction of gas. In a vacuum state, the smaller the pressure value of the gas, the thinner the gas and the higher the vacuum; conversely, the larger the pressure value, the denser the gas and the lower the vacuum. With the development of cryogenic technology, vacuum chambers that can be used in vacuum low-background environments are also receiving more and more attention. Summary of the invention
[0003] In view of this, the present invention provides a vacuum chamber that can be used in a vacuum low background environment, with low consumption, high control accuracy and a wide temperature range.
[0004] The present invention is achieved through the following technical scheme: a vacuum chamber that can be used in a vacuum low background environment, comprising a vacuum chamber body, a cooling chamber, a control pump, and a liquid nitrogen tank; the cooling chamber is placed inside the vacuum chamber body, and is connected to the liquid nitrogen tank outside the vacuum chamber body through a control pump, and the control pump controls the refrigeration of the cooling chamber by automatically adjusting the flow rate of the liquid nitrogen absorbed, thereby achieving temperature regulation of the vacuum chamber body.
[0005] Furthermore, the cooling chamber includes a cylindrical structure made of metal material and a refrigeration pipe, the refrigeration pipe is evenly wound around the outer periphery of the cylindrical structure, and the refrigeration pipe is connected to a control pump and connected to liquid nitrogen.
[0006] Furthermore, two groups of corresponding refrigeration pipes, control pumps and liquid nitrogen tanks are provided, and the two refrigeration pipes have different diameters and are wound on the cylindrical structure in the same direction without crossing.
[0007] Furthermore, the cylindrical structure is provided with an axial limit block, and a plurality of limit blocks are evenly arranged along the circumference of the cylindrical structure to form a limit unit, and a plurality of circle limit units are evenly arranged along the axial direction of the cylindrical structure. The axial limit block is used to limit the axial displacement of the refrigeration pipe.
[0008] Furthermore, the cylindrical structure is also provided with radial limit strips, several of which are parallel to the axis of the cylindrical structure and have both ends fixed on the cylindrical structure respectively. The radial limit strips are used to limit the radial displacement of the refrigeration pipe between themselves and the cylindrical structure.
[0009] Furthermore, the cylindrical structure is made of rolled copper plates, and the inner side of the cylindrical structure is coated with black vacuum paint; the refrigeration pipe is made of copper pipe.
[0010] Furthermore, a plurality of low-temperature thermocouples are arranged on the inner side of the vacuum chamber body and on the cooling chamber.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] 1. The present invention controls the self-priming of the pump to extract liquid nitrogen for refrigeration control, and adjusts the temperature of the vacuum chamber by adjusting the flow rate of the inhaled gas. It can be applied to fields such as aerospace remote sensing, and makes up for the defects of current commonly used equipment with the advantages of low consumption, high control accuracy, and a wide temperature range.
[0013] 2. The cooling chamber of the present invention adopts a "squirrel cage" design, and is made of copper plates to form a squirrel cage (cylindrical structure). A copper tube is coiled outside the squirrel cage to pass liquid nitrogen, thereby cooling the entire squirrel cage and then the entire vacuum chamber. The inside of the squirrel cage is painted with black vacuum paint to reduce the impact of heat radiation on the temperature of the cooling chamber.
[0014] 3. The present invention is provided with an axial limit block and a radial limit strip. The axial limit block can be used to prevent the refrigeration pipes on both sides from axially displacing and abutting or crossing each other; the radial limit strip can be used to prevent the refrigeration pipes from radially displacing and leaving the cylindrical structure.
[0015] 4. The present invention is equipped with a low-temperature thermocouple, which can measure the temperature of each part in real time. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 Schematic diagrams of cooling chambers of the present invention, wherein (a) is a schematic diagram of a cooling chamber with a large cylinder diameter, and (b) is a schematic diagram of a cooling chamber with a small cylinder diameter.
[0017] Figure 2 Schematic diagram of a self-pressurized liquid nitrogen tank. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0019] The present invention provides a vacuum chamber that can be used in a vacuum low background environment, comprising a vacuum chamber body, a cooling chamber, a control pump, and a liquid nitrogen tank; the cooling chamber is arranged inside the vacuum chamber body, and is connected to the liquid nitrogen tank outside the vacuum chamber body through a control pump to access liquid nitrogen; the control pump controls the refrigeration of the cooling chamber by automatically adjusting the flow rate of the liquid nitrogen absorbed, thereby realizing temperature regulation of the vacuum chamber body.
[0020] like Figure 1 As shown, the cooling chamber includes a cylindrical structure made of metal material and a refrigeration pipe, the refrigeration pipe is evenly wound around the outer periphery of the cylindrical structure, and the refrigeration pipe is connected to the control pump and connected to liquid nitrogen. Figure 2 As shown, in this embodiment, the liquid nitrogen tank adopts a 300L self-pressurized liquid nitrogen tank.
[0021] As an improvement, two sets of corresponding refrigeration pipes, control pumps and liquid nitrogen tanks can be provided, and the two refrigeration pipes have different diameters and are wound on the cylindrical structure in the same direction without crossing. The two refrigeration pipes can be controlled separately, and the different diameters of the refrigeration pipes facilitate more precise control of temperature changes, further ensuring control accuracy.
[0022] The cylindrical structure is provided with an axial limit block, and a plurality of limit blocks are evenly arranged along the circumference of the cylindrical structure to form a limit unit. A plurality of circle limit units are evenly arranged along the axial direction of the cylindrical structure. The axial limit block is used to limit the axial displacement of the refrigeration pipe. The refrigeration pipe is wound between the limit units, and the limit blocks can prevent the refrigeration pipes on both sides from being displaced along the axial direction of the cylindrical structure, thereby preventing them from abutting or crossing each other.
[0023] The cylindrical structure is also provided with radial limit strips, several of which are parallel to the axis of the cylindrical structure and have their two ends respectively fixed on the cylindrical structure. The refrigeration pipe passes under the radial limit strips. The radial limit strips can be used to limit the radial displacement of the refrigeration pipe between itself and the cylindrical structure to prevent the refrigeration pipe from detaching from the cylindrical structure.
[0024] In this embodiment, the cylindrical structure is made of copper plate, and the inside of the cylindrical structure is coated with black vacuum paint; the refrigeration tube is made of copper tube. Several low-temperature thermocouples are arranged on the inside of the vacuum chamber body and the cooling chamber to monitor the temperature of the internal temperature measurement points of the two. The measurement results show that the lower limit of the internal temperature of the vacuum chamber reaches about 93K, and the temperature uniformity is better than 3K.
[0025] The vacuum chamber used in a low vacuum background proposed by the present invention performs refrigeration control by controlling the self-priming of a pump to extract liquid nitrogen from a pressurized liquid nitrogen tank. The control pump adjusts the temperature of the vacuum chamber by adjusting the flow rate of the inhaled gas. The present invention can be applied in a low vacuum background.
[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A vacuum chamber that can be used in a vacuum low background environment, characterized in that: It includes vacuum chamber body, cooling chamber, control pump and liquid nitrogen tank; The cooling chamber is placed inside the vacuum chamber body, and is connected to the liquid nitrogen tank outside the vacuum chamber body through a control pump to access liquid nitrogen. The control pump controls the refrigeration of the cooling chamber by automatically adjusting the flow rate of the liquid nitrogen absorbed, thereby achieving temperature regulation of the vacuum chamber body.
2. The vacuum chamber that can be used in a vacuum low background environment as claimed in claim 1, characterized in that: The cooling chamber comprises a cylindrical structure made of metal material and a refrigeration pipe. The refrigeration pipe is evenly wound around the outer periphery of the cylindrical structure. The refrigeration pipe is connected to a control pump and connected to liquid nitrogen.
3. The vacuum chamber that can be used in a vacuum low background environment as claimed in claim 2, characterized in that: Two groups of corresponding refrigeration pipes, a control pump and a liquid nitrogen tank are provided. The two refrigeration pipes have different diameters and are wound on the cylindrical structure in the same direction without crossing.
4. The vacuum chamber that can be used in a vacuum low background environment as claimed in claim 2, characterized in that: The cylindrical structure is provided with an axial limit block, and a plurality of limit blocks are evenly arranged along the circumference of the cylindrical structure to form a limit unit. A plurality of circle limit units are evenly arranged along the axial direction of the cylindrical structure. The axial limit block is used to limit the axial displacement of the refrigeration pipe.
5. The vacuum chamber that can be used in a vacuum low background environment as claimed in claim 4, characterized in that: The cylindrical structure is also provided with radial limit strips, which are parallel to the axis of the cylindrical structure and have both ends fixed on the cylindrical structure respectively. The radial limit strips are used to limit the radial displacement of the refrigeration pipe between itself and the cylindrical structure.
6. The vacuum chamber that can be used in a vacuum low background environment as claimed in claim 2, characterized in that: The cylindrical structure is made of rolled copper plates, and the inside of the cylindrical structure is coated with black vacuum paint; the refrigeration pipes are made of copper pipes.
7. The vacuum chamber that can be used in a vacuum low background environment as claimed in any one of claims 1 to 6, characterized in that: A plurality of low-temperature thermocouples are arranged on the inner side of the vacuum chamber body and on the cooling cabin.