Small liquid oxygen preparation device

Abstract

The utility model relates to the field of liquid oxygen preparation, in particular to a small liquid oxygen preparation device which comprises an oxygen preparation module, an oxygen liquefaction module, a liquid oxygen storage tank, a controller, a detection assembly and a cabinet body. The oxygen preparation module comprises a filter, an air compressor, a cooler, an adsorption tower, an oxygen storage tank and a silencer. The oxygen liquefaction module comprises a pre-cooling loop, a main cooling loop and an oxygen liquefaction branch; wherein the pre-cooling loop comprises a pre-cooling compressor, a pre-cooling oil separator, a pre-cooling condenser, a pre-cooling heat exchanger and a pre-cooling throttling element, and the main cooling loop comprises a main cooling compressor, a main cooling oil separator, a main cooling condenser, a main cooling heat exchanger and a main cooling throttling element. The pre-cooling heat exchanger, the pre-cooling throttling element, the main cooling heat exchanger and the main cooling throttling element are integrally arranged in the vacuum refrigeration bin. The small integrated liquid oxygen preparation device is simple in structure, low in cost and easy to maintain.

Description

Technical Field

[0001] This utility model relates to the field of liquid oxygen preparation, specifically a small liquid oxygen preparation device. Background Technology

[0002] Liquid oxygen is oxygen in a liquid form and has wide applications in healthcare, industrial production, aerospace, and submarines. Currently, the main methods for preparing liquid oxygen are as follows:

[0003] Method 1: Cryogenic distillation, which involves liquefying air through methods such as compression and cyclic deep freezing, followed by distillation to separate liquid oxygen. For example, Chinese patent CN105758119A provides a liquid oxygen preparation device utilizing this method, and modifies the distillation column to produce purer liquid oxygen. Chinese patent CN113375420A also provides a liquid oxygen preparation method and device based on this method, recovering cold energy through an expander to improve the problems of unreasonable heat exchanger temperature distribution and high energy consumption in existing production equipment. This method's production equipment is characterized by large footprint, high cost, and high output, and is often used for industrial liquid oxygen production.

[0004] Method Two: Building upon Method One, oxygen is first prepared through adsorption separation, followed by compression and cooling liquefaction. For example, Chinese Patent CN113896174A provides a liquid oxygen preparation system and method that reduces unnecessary energy consumption through adsorption separation and waste liquid pre-cooling. However, this method still suffers from problems such as large device size and high initial investment.

[0005] Method 3: Building upon Method 2, this method employs a refrigeration unit to directly liquefy oxygen. For example, Chinese patent CN219674594U provides a small-scale liquid oxygen preparation and storage device. This method effectively reduces the equipment's footprint and is suitable for small-scale applications such as laboratories. However, the refrigeration unit is expensive and has high maintenance costs.

[0006] Therefore, there is currently a lack of a small, integrated liquid oxygen preparation device that is simple in structure, low in cost, and easy to maintain. Utility Model Content

[0007] The purpose of this invention is to provide a small, integrated liquid oxygen preparation device that is simple in structure, low in cost, and easy to maintain.

[0008] To achieve the above, this utility model provides the following technical solution: a small liquid oxygen preparation device, comprising an oxygen preparation module, an oxygen liquefaction module, a liquid oxygen storage tank, a controller, detection components, and a cabinet. The oxygen preparation module includes a filter, an air compressor, a cooler, an air exchange valve, an adsorption tower, a three-way valve, an oxygen storage tank, and a silencer. The oxygen liquefaction module includes a pre-cooling circuit, a main cooling circuit, and an oxygen compressor. The pre-cooling circuit includes a pre-cooling compressor, a pre-cooling oil separator, a pre-cooling condenser, a pre-cooling heat exchanger, and a pre-cooling throttling device, wherein the pre-cooling heat exchanger is a 5-flow plate-fin heat exchanger. The main cooling circuit includes a main cooling compressor, a main cooling oil separator, a main cooling condenser, a main cooling heat exchanger, and a main cooling throttling device, wherein the main cooling heat exchanger is a 3-flow plate-fin heat exchanger. The pre-cooling heat exchanger, the pre-cooling throttling device, the main cooling heat exchanger, and the main cooling throttling device are integrated and arranged within a vacuum refrigeration chamber to reduce cooling loss and facilitate miniaturization of the device.

[0009] Furthermore, filters can remove impurities such as dust, oil mist, and moisture from the air to produce clean and dry air.

[0010] Furthermore, the adsorption tower is a parallel dual-tower structure to allow for alternating adsorption and desorption operations. The adsorption tower contains molecular sieves to adsorb nitrogen, carbon dioxide, and residual moisture from the air.

[0011] Furthermore, the filter is connected to the air compressor and cooler in sequence via pipelines; the air exchange valve has four ports, of which port A is connected to the air outlet of the cooler, ports B and C are connected to the lower ports of the two adsorption towers respectively, and port D is connected to the silencer; the switching between the two adsorption towers is realized by changing the working position of the air exchange valve; the exhaust gas from the adsorption tower is discharged into the atmosphere through the silencer to reduce the noise of the device.

[0012] Furthermore, the upper interfaces of the two adsorption towers are connected to the air inlet of the tee fitting via pipelines, and the air outlet of the tee fitting is connected to the air inlet of the oxygen storage tank. A balancing valve is connected between the upper interfaces of the two adsorption towers via pipelines to perform pressure equalization and backwashing operations on the two towers.

[0013] Furthermore, the outlet of the precooling compressor is connected sequentially via pipelines to the inlet of the first flow path of the precooling oil separator, the precooling condenser, and the precooling heat exchanger. The outlet of the first flow path of the precooling heat exchanger is connected to the inlet of the precooling throttling device, the outlet of the precooling throttling device is connected to the inlet of the second flow path of the precooling heat exchanger, and the outlet of the second flow path of the precooling heat exchanger is connected to the inlet of the precooling compressor. The outlet of the main refrigeration compressor is connected sequentially via pipelines to the inlet of the third flow path of the main refrigeration oil separator, the main refrigeration condenser, and the precooling heat exchanger. The outlet of the third flow path of the precooling heat exchanger is connected to the inlet of the first flow path of the main refrigeration heat exchanger. The outlet of stream one of the cold heat exchanger is connected to the inlet of the main cold throttling device. The outlet of the main cold throttling device is connected to the inlet of stream two of the main cold heat exchanger. The outlet of stream two of the main cold heat exchanger is connected to the inlet of stream four of the pre-cooling heat exchanger. The outlet of stream four of the pre-cooling heat exchanger is connected to the inlet of the main cold compressor. The inlet of the oxygen compressor is connected to the outlet of the oxygen storage tank. The outlet of the oxygen compressor is connected to the inlet of stream five of the pre-cooling heat exchanger. The outlet of stream five of the pre-cooling heat exchanger is connected to the inlet of stream three of the main cold heat exchanger. The outlet of stream three of the main cold heat exchanger is connected to the liquid oxygen storage tank through a pipeline.

[0014] Furthermore, both the precooling condenser and the main cooling condenser are air-cooled for ease of operation. Both the precooling and main cooling throttling devices are capillary throttling devices, which helps reduce the size of the unit.

[0015] Furthermore, the oxygen preparation module, oxygen liquefaction module, liquid oxygen storage tank, and detection components are integrated inside the cabinet. The controller is located on the front of the cabinet and is connected to the detection components, oxygen preparation module, and oxygen liquefaction module via signal transmission. The detection components include pressure detection elements, temperature detection elements, and liquid level detection elements installed in the liquid oxygen storage tank for monitoring the liquid oxygen storage quantity and its status. The detection components also include pressure detection elements, oxygen concentration detection elements, and flow detection elements installed in the oxygen preparation module, as well as pressure detection elements and temperature detection elements installed in the oxygen liquefaction module, for monitoring the operating status of the device.

[0016] Furthermore, the precooling circuit is filled with a combination of medium- and high-boiling-point multi-component mixed refrigerants, while the main cooling circuit is filled with a combination of low-boiling-point multi-component mixed refrigerants. Both types of mixed refrigerants are non-flammable to ensure the safety of the device.

[0017] The beneficial effects of this utility model are as follows:

[0018] (1) Liquid oxygen can be produced by relying solely on electrical energy, and it is plug-and-play, enabling a stable and convenient supply of liquid oxygen.

[0019] (2) Liquid oxygen is produced by using a combination of a precooling heat exchanger, a precooling throttling device, a main cooling heat exchanger and a main cooling throttling device to produce liquid oxygen. Compared with refrigeration devices that use a refrigeration machine, liquid oxygen has the advantages of simple equipment, low cost and easy maintenance.

[0020] (3) Integrating multiple low-temperature components into the vacuum refrigeration chamber reduces heat loss, improves the effective utilization rate of cold energy, and greatly reduces the size of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working principle of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0023] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0024] In the diagram, 1. Filter; 2. Air compressor; 3. Cooler; 4. Ventilation valve; 5. Silencer; 6. Adsorption tower; 7. Vacuum refrigeration chamber; 8. Balancing valve; 9. Oxygen storage tank; 10. Oxygen compressor; 11. Pre-cooling compressor; 12. Pre-cooling oil separator; 13. Pre-cooling condenser; 14. Pre-cooling heat exchanger; 15. Pre-cooling throttling device; 16. Main refrigeration heat exchanger; 17. Main refrigeration throttling device; 18. Main refrigeration condenser; 19. Main refrigeration oil separator; 20. Main refrigeration compressor; 21. Liquid oxygen storage tank; 22. T-joint; 23. Cabinet; 24. Controller. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, this utility model discloses a small liquid oxygen preparation device, including an oxygen preparation module, an oxygen liquefaction module, a liquid oxygen storage tank 21, a controller 24, a detection component, and a cabinet 23. The oxygen preparation module includes a filter 1, an air compressor 2, a cooler 3, an air exchange valve 4, an adsorption tower 6, a three-way connector 22, an oxygen storage tank 9, and a silencer 5. The oxygen liquefaction module includes a pre-cooling circuit, a main cooling circuit, and an oxygen compressor. The pre-cooling circuit includes a pre-cooling compressor 11, a pre-cooling oil separator 12, a pre-cooling condenser 13, a pre-cooling heat exchanger 14, and a pre-cooling throttling device 15, wherein the pre-cooling heat exchanger 14 is a 5-flow plate-fin heat exchanger. The main cooling circuit includes a main cooling compressor 20, a main cooling oil separator 19, a main cooling condenser 18, a main cooling heat exchanger 16, and a main cooling throttling device 17, wherein the main cooling heat exchanger 16 is a 3-flow plate-fin heat exchanger. The precooling heat exchanger 14, the precooling throttling device 15, the main cooling heat exchanger 16, and the main cooling throttling device 17 are integrated in the vacuum refrigeration chamber 7 to reduce the loss of cooling capacity and to help to achieve the miniaturization of the device.

[0027] The adsorption tower 6 is a parallel double-tower structure, containing molecular sieves. The filter 1 is connected sequentially to the air compressor 2 and the cooler 3 via pipelines. The air exchange valve 4 has four ports: port A is connected to the outlet of the cooler 3, ports B and C are connected to the lower ports of the two towers of the adsorption tower 6, and port D is connected to the silencer 5. The exhaust gas from the adsorption tower 6 is discharged into the atmosphere through the silencer 5 to reduce noise. The upper ports of the two towers of the adsorption tower 6 are connected to the inlet of the tee fitting 22 via pipelines, and the outlet of the tee fitting 22 is connected to the inlet of the oxygen storage tank 9. A balancing valve 8 is connected between the upper ports of the two towers of the adsorption tower 6 via pipelines to achieve pressure equalization and backwashing operations. Filter 1 can remove impurities such as dust, oil mist, and moisture from the air; by switching the air exchange valve 4, the two towers of adsorption tower 6 can alternately perform adsorption and desorption operations; the high-performance molecular sieve can adsorb nitrogen, carbon dioxide and residual moisture in the air to produce high-concentration oxygen.

[0028] like Figure 1As shown, the outlet of the precooling compressor 11 is connected in sequence via pipelines to the inlet of the first stream of the precooling oil separator 12, the precooling condenser 13, and the precooling heat exchanger 14. The outlet of the first stream of the precooling heat exchanger 14 is connected to the inlet of the precooling throttling device 15, the outlet of the precooling throttling device 15 is connected to the inlet of the second stream of the precooling heat exchanger 14, and the outlet of the second stream of the precooling heat exchanger 14 is connected to the inlet of the precooling compressor 11. The outlet of the main cooling compressor 20 is connected in sequence via pipelines to the inlet of the third stream of the main cooling oil separator 19, the main cooling condenser 18, and the precooling heat exchanger 14. The outlet of the third stream of the precooling heat exchanger 14 is connected to the inlet of the first stream of the main cooling heat exchanger 16. The outlet of the first stream of heat exchanger 16 is connected to the inlet of the main cooling throttling device 17, the outlet of the main cooling throttling device 17 is connected to the inlet of the second stream of the main cooling heat exchanger 16, the outlet of the second stream of the main cooling heat exchanger 16 is connected to the inlet of the fourth stream of the precooling heat exchanger 14, and the outlet of the fourth stream of the precooling heat exchanger 14 is connected to the inlet of the main cooling compressor 20; the inlet of the oxygen compressor 10 is connected to the outlet of the oxygen storage tank 9, the outlet of the oxygen compressor 10 is connected to the inlet of the fifth stream of the precooling heat exchanger 14, the outlet of the fifth stream of the precooling heat exchanger 14 is connected to the inlet of the third stream of the main cooling heat exchanger 16, and the outlet of the third stream of the main cooling heat exchanger 16 is connected to the liquid oxygen storage tank 21 through a pipeline.

[0029] Both the precooling condenser 13 and the main cooling condenser 18 are air-cooled for ease of operation. Both the precooling throttling device 15 and the main cooling throttling device 17 are capillary throttling devices, which helps to reduce the size of the device.

[0030] like Figure 2 and Figure 3 The oxygen preparation module, oxygen liquefaction module, liquid oxygen storage tank 21, and detection components are integrated inside the cabinet 23. The controller 24 is located on the front of the cabinet 23 and is connected to the detection components, oxygen preparation module, and oxygen liquefaction module via signals. The detection components include pressure detection elements, temperature detection elements, and liquid level detection elements installed in the liquid oxygen storage tank 21 for monitoring the liquid oxygen storage quantity and its status. The detection components also include pressure detection elements, oxygen concentration detection elements, and flow detection elements installed in the oxygen preparation module, as well as pressure detection elements and temperature detection elements installed in the oxygen liquefaction module for monitoring the operating status of the device.

[0031] The precooling circuit is filled with a combination of medium- and high-boiling-point multi-component mixed refrigerants, while the main cooling circuit is filled with a combination of low-boiling-point multi-component mixed refrigerants. Both types of mixed refrigerants are non-flammable to ensure the safety of the device.

Claims

1. A small-scale liquid oxygen preparation device, characterized in that, It includes an oxygen preparation module, an oxygen liquefaction module, a liquid oxygen storage tank, a controller, detection components, and a cabinet; The oxygen preparation module includes a filter, an air compressor, a cooler, a ventilation valve, an adsorption tower, a three-way valve, an oxygen storage tank, and a silencer. The oxygen liquefaction module includes a precooling circuit, a main cooling circuit, and an oxygen compressor. The precooling circuit includes a precooling compressor, a precooling oil separator, a precooling condenser, a precooling heat exchanger, and a precooling throttling device. The precooling heat exchanger is a 5-flow plate-fin heat exchanger. The main cooling circuit includes a main cooling compressor, a main cooling oil separator, a main cooling condenser, a main cooling heat exchanger, and a main cooling throttling device. The main cooling heat exchanger is a 3-flow plate-fin heat exchanger. The precooling heat exchanger, the precooling throttling device, the main cooling heat exchanger, and the main cooling throttling device are integrated and arranged within a vacuum refrigeration chamber.

2. The small-scale liquid oxygen preparation device according to claim 1, characterized in that, The adsorption tower is a parallel double-tower structure, and the adsorption tower contains molecular sieves. The filter is connected to the air compressor and the cooler in sequence through pipelines. The air exchange valve has four ports, of which port A is connected to the air outlet of the cooler, ports B and C are connected to the lower ports of the two adsorption towers respectively, and port D is connected to the silencer. The upper ports of the two adsorption towers are connected to the air inlet of the three-way fitting through pipelines, and the air outlet of the three-way fitting is connected to the air inlet of the oxygen storage tank. A balancing valve is connected between the upper ports of the two adsorption towers through pipelines.

3. The small-scale liquid oxygen preparation device according to claim 1, characterized in that, The outlet of the precooling compressor is connected in sequence via pipelines to the inlet of the first flow path of the precooling oil separator, the precooling condenser, and the precooling heat exchanger. The outlet of the first flow path of the precooling heat exchanger is connected to the inlet of the precooling throttling device, the outlet of the precooling throttling device is connected to the inlet of the second flow path of the precooling heat exchanger, and the outlet of the second flow path of the precooling heat exchanger is connected to the inlet of the precooling compressor. The outlet of the main cooling compressor is connected in sequence via pipelines to the inlet of the third flow path of the main cooling oil separator, the main cooling condenser, and the precooling heat exchanger. The outlet of the third flow path of the precooling heat exchanger is connected to the inlet of the first flow path of the main cooling heat exchanger. The outlet of heat exchanger stream one is connected to the inlet of the main refrigeration throttling device, the outlet of the main refrigeration throttling device is connected to the inlet of the main refrigeration heat exchanger stream two, the outlet of the main refrigeration heat exchanger stream two is connected to the inlet of the pre-refrigeration heat exchanger stream four, and the outlet of the pre-refrigeration heat exchanger stream four is connected to the inlet of the main refrigeration compressor; the inlet of the oxygen compressor is connected to the outlet of the oxygen storage tank, the outlet of the oxygen compressor is connected to the inlet of the pre-refrigeration heat exchanger stream five, the outlet of the pre-refrigeration heat exchanger stream five is connected to the inlet of the main refrigeration heat exchanger stream three, and the outlet of the main refrigeration heat exchanger stream three is connected to the liquid oxygen storage tank via a pipeline.

4. A small-scale liquid oxygen preparation device according to claim 1, characterized in that, Both the precooling condenser and the main condenser are air-cooled, and both the precooling throttling device and the main condenser are capillary throttling devices.

5. A small-scale liquid oxygen preparation device according to claim 1, characterized in that, The oxygen preparation module, oxygen liquefaction module, liquid oxygen storage tank, and detection components are integrated inside the cabinet described in section 1. The controller is located on the front of the cabinet and is signal-connected to the detection components, oxygen preparation module, and oxygen liquefaction module. The detection components include pressure detection elements, temperature detection elements, and liquid level detection elements installed in the liquid oxygen storage tank. The detection components also include pressure detection elements, oxygen concentration detection elements, and flow detection elements installed in the oxygen preparation module, as well as pressure detection elements and temperature detection elements installed in the oxygen liquefaction module.

6. A small-scale liquid oxygen preparation device according to claim 1, characterized in that, The precooling circuit is filled with a multi-component mixed refrigerant with medium and high boiling points, and the main cooling circuit is filled with a multi-component mixed refrigerant with low boiling points. Both types of mixed refrigerants are non-flammable.

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