Dry carbon dioxide snow cleaning system

Abstract

This utility model belongs to the field of dry cleaning technology and discloses a dry carbon dioxide snowflake cleaning system. It includes a liquid carbon dioxide unit, a compressed gas unit, and a nozzle. The liquid carbon dioxide unit provides a stable supply of liquid carbon dioxide. The compressed gas unit includes a first compressed gas supply component, a first switching valve, and a heating element. Along the flow direction of the compressed gas, the first compressed gas supply component, the first switching valve, and the heating element are sequentially connected. The nozzle is provided with a first inlet, a second inlet, and a cleaning port. The liquid carbon dioxide unit is connected to the first inlet via a first pipe, and the heating element is connected to the second inlet via a second pipe. The cleaning port is connected to both the first and second inlets, allowing liquid carbon dioxide and compressed gas to be sprayed from the cleaning port to clean the surface of the part to be cleaned. The dry carbon dioxide snowflake cleaning system provided by this utility model saves energy and improves the service life of the heating element.

Description

Technical Field

[0001] This utility model relates to the field of dry cleaning technology, and in particular to a dry carbon dioxide snowflake cleaning system. Background Technology

[0002] Currently, wet cleaning methods are commonly used for cleaning products such as semiconductors, precision devices, and medical instruments. While these methods meet the cleaning requirements, they can leave stains on the products and the cleaning solutions can cause environmental pollution. Carbon dioxide cleaning, on the other hand, delivers liquid carbon dioxide through a pressurization system to a special nozzle and ejects it at high speed. The liquid carbon dioxide condenses into snowflake-shaped dry ice microcrystals. When these dry ice microcrystals are carried to the surface being cleaned by compressed air, they instantly vaporize and expand, removing particles, dirt, dust, oil stains, and other contaminants from the workpiece surface. Therefore, carbon dioxide cleaning is widely used in fields such as automotive manufacturing, electronics manufacturing, aerospace, and medical devices.

[0003] In related technologies, a dry ice cleaning method and system are provided, including a liquid carbon dioxide module, an auxiliary gas supply module, and nozzles. Liquid carbon dioxide and heated auxiliary gas are mixed and sprayed from the nozzles to clean the surfaces of devices and items. However, when the auxiliary gas supply stops, because the switching valve is located after the heater, the heater is always energized or de-energized when the valve is closed. When the heater is always energized, the auxiliary gas between the heater and the switching valve is continuously heated, resulting in energy waste and reduced heater lifespan. When the heater is de-energized, the auxiliary gas between the heater and the switching valve is not heated and gradually cools down. When auxiliary gas supply is needed, this portion of auxiliary gas is discharged before being heated to the set temperature, reducing the quality of dry cleaning. Alternatively, this portion of auxiliary gas needs to be heated to the set temperature before the switching valve is opened, reducing the efficiency of the cleaning system. Utility Model Content

[0004] The purpose of this invention is to provide a dry carbon dioxide snow cleaning system. This system saves energy, extends the service life of heating elements, and improves the efficiency of the dry carbon dioxide snow cleaning system.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Dry carbon dioxide snow cleaning system, including:

[0007] A liquid carbon dioxide unit, wherein the liquid carbon dioxide unit is used to provide a stable supply of liquid carbon dioxide;

[0008] A compressed gas unit, comprising a first compressed gas supply component, a first switching valve, and a heating element, wherein the first compressed gas supply component, the first switching valve, and the heating element are sequentially connected and communicate with each other along the flow direction of the compressed gas;

[0009] The nozzle is provided with a first inlet, a second inlet, and a cleaning port. The liquid carbon dioxide unit is connected to the first inlet through a first pipeline, and the heating element is connected to the second inlet through a second pipeline. The cleaning port is connected to the first inlet and the second inlet. The liquid carbon dioxide and the compressed gas can be sprayed out from the cleaning port to clean the surface of the part to be cleaned.

[0010] Preferably, the first compressed gas supply assembly includes:

[0011] A gas source component, wherein the gas source component is used to provide compressed gas;

[0012] The first gas filter element has its inlet connected to the gas source element via a third pipeline, and its outlet connected to the inlet of the first switching valve via a fourth pipeline.

[0013] The first regulating valve is disposed on the fourth pipeline.

[0014] Preferably, the compressed gas unit further includes a second compressed gas supply assembly, the second compressed gas supply assembly comprising:

[0015] A gas source component, wherein the gas source component is used to provide compressed gas;

[0016] The second gas filter has its inlet connected to the gas source via a fifth pipeline, and its outlet connected to the liquid carbon dioxide unit via a sixth pipeline.

[0017] A second regulating valve is disposed on the sixth pipeline to control the flow of liquid carbon dioxide from the liquid carbon dioxide unit to the first inlet.

[0018] Preferably, the second regulating valve is a piezoelectric valve.

[0019] Preferably, the liquid carbon dioxide unit comprises:

[0020] A liquid source component, wherein the liquid source component is used to provide liquid carbon dioxide;

[0021] At least one booster pump, the inlet of which is connected to the outlet of the liquid source component via a seventh pipeline, and the outlet of which is connected to the first inlet via the first pipeline.

[0022] Preferably, two booster pumps are provided, and the two booster pumps are connected in parallel.

[0023] Preferably, the liquid carbon dioxide unit further includes:

[0024] A cooling filter element is disposed on the first pipeline.

[0025] Preferably, the liquid carbon dioxide unit further includes:

[0026] A voltage stabilizer is disposed on the first pipeline.

[0027] Preferably, the voltage regulator is an energy storage device.

[0028] Preferably, the dry carbon dioxide snowflake cleaning system includes:

[0029] An outer casing is provided around the liquid carbon dioxide unit and the compressed gas unit.

[0030] The beneficial effects of this utility model are:

[0031] This utility model provides a dry carbon dioxide snowflake cleaning system, including a liquid carbon dioxide unit, a compressed gas unit, and a nozzle. The liquid carbon dioxide unit can provide a stable supply of liquid carbon dioxide. The compressed gas unit includes a first compressed gas supply component, a first switching valve, and a heating element. Along the flow direction of the compressed gas, the first compressed gas supply component, the first switching valve, and the heating element are sequentially connected and communicate with each other. The nozzle is provided with a first inlet, a second inlet, and a cleaning port. The liquid carbon dioxide unit is connected to the first inlet through a first pipeline, and the heating element is connected to the second inlet through a second pipeline. The cleaning port is communicated with the first inlet and the second inlet. Liquid carbon dioxide and compressed gas can be sprayed out from the cleaning port to clean the surface of the part to be cleaned.

[0032] Liquid carbon dioxide enters the nozzle through the first inlet, while heated compressed gas enters through the second inlet. Inside the nozzle, the liquid carbon dioxide rapidly atomizes and solidifies into snowflake-shaped dry ice particles due to the sudden pressure drop and the impact of the compressed gas. These particles are then carried by the high-pressure compressed gas and ejected at high speed from the cleaning port. The surface of the parts to be cleaned is achieved through the impact and sublimation cooling effect of the dry ice particles. When the dry carbon dioxide snowflake cleaning system stops working, the first switch valve closes, and the compressed gas is stopped at the first switch valve, allowing the heating element to shut off. This saves energy and extends the service life of the heating element. At the same time, there is no compressed gas residue between the heating element and the first switch valve, allowing compressed air to directly pass through the heating element and enter the second inlet when the first switch valve reopens, avoiding secondary heating of the residual compressed gas and improving the efficiency of the cleaning system. Attached Figure Description

[0033] Figure 1 This is a first schematic diagram of the dry carbon dioxide snowflake cleaning system provided in this embodiment of the present invention;

[0034] Figure 2 This is a second schematic diagram of the dry carbon dioxide snowflake cleaning system provided in this embodiment of the present invention.

[0035] In the picture:

[0036] 1. Liquid carbon dioxide unit; 11. Booster pump; 12. Cooling filter; 13. Pressure stabilizer; 14. Second switching valve;

[0037] 2. Compressed gas unit; 21. First compressed gas supply assembly; 211. First gas filter; 212. First regulating valve; 22. Second compressed gas supply assembly; 221. Second gas filter; 222. Second regulating valve; 23. First switching valve; 24. Heating element;

[0038] 3. Nozzle; 31. First inlet; 32. Second inlet; 33. Cleaning port. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] This embodiment provides a dry carbon dioxide snowflake cleaning system, such as Figure 1 As shown, the device includes a liquid carbon dioxide unit 1, a compressed gas unit 2, and a nozzle 3. The liquid carbon dioxide unit 1 provides a stable supply of liquid carbon dioxide. The compressed gas unit 2 includes a first compressed gas supply component 21, a first switching valve 23, and a heating element 24. Along the flow direction of the compressed gas, the first compressed gas supply component 21, the first switching valve 23, and the heating element 24 are sequentially connected and communicate with each other. The nozzle 3 is provided with a first inlet 31, a second inlet 32, and a cleaning port 33. The liquid carbon dioxide unit 1 is connected to the first inlet 31 through a first pipeline, and the heating element 24 is connected to the second inlet 32 ​​through a second pipeline. The cleaning port 33 communicates with the first inlet 31 and the second inlet 32. Liquid carbon dioxide and compressed gas can be sprayed out from the cleaning port 33 to clean the surface of the part to be cleaned.

[0044] Liquid carbon dioxide enters nozzle 3 through the first inlet 31, and heated compressed gas enters nozzle 3 through the second inlet 32. Inside nozzle 3, the liquid carbon dioxide rapidly atomizes and solidifies into snowflake-shaped dry ice particles due to the sudden pressure drop and the impact of the compressed gas. These particles are then carried by the high-pressure compressed gas and ejected at high speed from cleaning port 33. The surface of the part to be cleaned is achieved through the impact and sublimation cooling effect of the dry ice particles. When the dry carbon dioxide snowflake cleaning system stops working, the first switch valve 23 closes, and the compressed gas is stopped at the first switch valve 23. The heating element 24 can then be shut off, saving energy and increasing the service life of the heating element 24. At the same time, there is no compressed gas residue between the heating element 24 and the first switch valve 23, so when the first switch valve 23 is reopened, the compressed air can directly pass through the heating element 24 and enter the second inlet 32, avoiding secondary heating of the residual compressed gas and improving the efficiency of the cleaning system. It should be noted that in this embodiment, the compressed gas is compressed air. Compressed air has the lowest cost and is highly practical and convenient. In other embodiments, the compressed gas can also be compressed nitrogen, etc. There are no limitations here.

[0045] Specifically, both the first and second pipes are made of stainless steel. Since liquid carbon dioxide absorbs heat when ejected, stainless steel can withstand low temperatures, preventing the pipes from freezing and cracking, which could cause malfunctions or damage to the cleaning system. In other embodiments, the first and second pipes may be made of aluminum alloy, etc. No limitations are imposed here.

[0046] Specifically, such as Figure 1 As shown, in this embodiment, the first switching valve 23 is a shut-off valve. In other embodiments, the first switching valve 23 may also be a gate valve, butterfly valve, or ball valve, etc. No limitation is imposed here.

[0047] Specifically, such as Figure 1 As shown, in this embodiment, the heating element 24 is a resistance heater. In other embodiments, the heating element 24 may also be an electromagnetic heater, a steam heater, or an infrared heater, etc. No limitation is imposed here.

[0048] Optionally, such as Figure 1 As shown, the first compressed gas supply assembly 21 includes a gas source (not shown), a first gas filter 211, and a first regulating valve 212. The gas source provides compressed gas. The inlet of the first gas filter 211 is connected to the gas source via a third pipeline, and the outlet of the first gas filter 211 is connected to the inlet of the first switching valve 23 via a fourth pipeline. The first regulating valve 212 is located on the fourth pipeline. Before the compressed gas enters the heating element 24, the gas source is activated and provides compressed air. The compressed air then enters the first gas filter 211 through the third pipeline for filtration to remove impurities. It then enters the first regulating valve 212 through the fourth pipeline, making the flow rate of the compressed air variable. Finally, it enters the first switching valve 23 to control whether the compressed gas flows to the heating element 24. This configuration ensures that the compressed air discharged from the first switching valve 23 is clean, stable, and controllable. It should be noted that in this embodiment, the gas source is an air compressor. In other embodiments, the gas source can also be a compressed air tank, etc. No limitation is made here.

[0049] Specifically, in this embodiment, the first gas filter element 211 is an adsorption filter. In other embodiments, the first gas filter element 211 may also be a mechanical filter or a combined filter, etc. No limitations are imposed here.

[0050] Specifically, in this embodiment, the first regulating valve 212 is a piezoelectric valve. Piezoelectric valves have low energy consumption, high precision, and fast response speed. In other embodiments, the first regulating valve 212 can also be a flow valve, etc. No limitation is made here.

[0051] Optionally, such as Figure 1As shown, the compressed gas unit 2 also includes a second compressed gas supply component 22. The second compressed gas supply component 22 includes a gas source, a second gas filter 221, and a second regulating valve 222. The gas source is used to supply compressed gas. The inlet of the second gas filter 221 is connected to the gas source through a fifth pipeline, and the outlet of the second gas filter 221 is connected to the liquid carbon dioxide unit 1 through a sixth pipeline. The second regulating valve 222 is provided on the sixth pipeline to control the flow of liquid carbon dioxide in the liquid carbon dioxide unit 1 to the first inlet 31.

[0052] Specifically, in this embodiment, the second gas filter 221 is an adsorption filter. In other embodiments, the second gas filter 221 may also be a mechanical filter or a combined filter, etc. No limitations are imposed here.

[0053] Specifically, in this embodiment, the second regulating valve 222 is a piezoelectric valve. Piezoelectric valves have low energy consumption, high precision, and fast response speed. In other embodiments, the second regulating valve 222 can also be a flow valve, etc. No limitation is made here.

[0054] Optionally, the liquid carbon dioxide unit 1 includes a liquid source component and at least one booster pump 11. The liquid source component provides liquid carbon dioxide, and the inlet of the booster pump 11 is connected to the outlet of the liquid source component via a seventh pipeline. The outlet of the booster pump 11 is connected to the first inlet 31 via a first pipeline. The liquid carbon dioxide flowing out of the liquid source component is pressurized by the booster pump 11, ensuring that the liquid carbon dioxide meets the pressure required to enter the first inlet 31, thereby improving the reliability of the cleaning system.

[0055] Specifically, the outlet of the second gas filter 221 is connected to the control port of the booster pump 11 through a sixth pipeline, and the second regulating valve 222 is installed on the sixth pipeline.

[0056] More specifically, the booster pump 11 has a booster ratio of 1:10 to 1:18. In this embodiment, the booster pump 11 preferably has a booster ratio of 1:16.

[0057] Specifically, in this embodiment, the booster pump 11 is a plunger pump. In other embodiments, the booster pump 11 is a gear pump, etc. No limitation is made here.

[0058] Specifically, in this embodiment, only one booster pump 11 is provided, which saves costs. In other embodiments, two booster pumps 11 are provided, and the two booster pumps 11 are connected in parallel. The two booster pumps 11 form a one-in-one-backup mode, so that if one fails, the other starts and continues to work, ensuring the continuity and reliability of the cleaning system.

[0059] Optionally, the liquid carbon dioxide unit 1 further includes a cooling filter 12, which is disposed on the first pipeline. When carbon dioxide enters the cooling filter 12, it is cooled and filtered. Cooling and filtration address the issues of partial vaporization of liquid carbon dioxide after pressurization and the purity of the liquid carbon dioxide, ultimately achieving a stable output of liquid carbon dioxide. This avoids instability in the state of liquid carbon dioxide due to environmental temperature differences during subsequent transportation, thus improving the cleaning quality and reliability of the cleaning system. Specifically, along the flow direction of the liquid carbon dioxide, the cooling filter 12 is located downstream of the booster pump 11.

[0060] Specifically, in this embodiment, the cooling filter 12 is a coolant filter. In other embodiments, the cooling filter 12 is a dual-type cooling water bag filter, etc. No limitation is made here.

[0061] Optionally, such as Figure 1 As shown, the liquid carbon dioxide unit 1 also includes a pressure stabilizer 13, which is disposed on the first pipeline. The pressure stabilizer 13 can stabilize the pressure of the liquid carbon dioxide in the first pipeline. Since liquid carbon dioxide is easily affected by changes in temperature and flow rate, the pressure may fluctuate. The pressure stabilizer 13 can automatically adjust to control the pressure within a set range, so that the liquid carbon dioxide flowing to the first inlet 31 can maintain a stable pressure and flow rate.

[0062] Specifically, in this embodiment, the pressure regulator 13 is located downstream of the cooling filter 12, along the flow direction of the liquid carbon dioxide. In other embodiments, the pressure regulator 13 is located upstream of the cooling filter 12, etc. No limitation is made here.

[0063] Specifically, the pressure regulator 13 is an accumulator. Besides storing energy, buffering, and replenishing pressure with potential energy to effectively smooth pressure fluctuations and achieve system pressure stabilization, the accumulator can also buffer liquid carbon dioxide when there is too much in the second pipeline and supply liquid carbon dioxide when there is too little at the first inlet 31, thus achieving a stable supply of liquid carbon dioxide, etc. In other embodiments, the pressure regulator 13 may be a pressure regulating valve or a pressure regulating pipe, etc. No limitations are imposed here.

[0064] Optionally, such as Figure 1 As shown, in this embodiment, the liquid carbon dioxide unit 1 further includes a second switching valve 14. The second switching valve 14 is disposed on the first pipeline and is located downstream of the pressure regulator 13 along the flow direction of the liquid carbon dioxide. The second switching valve 14 can open or close the passage for liquid carbon dioxide to flow to the first inlet 31. It should be noted that in this embodiment, the second switching valve 14 is a high-pressure gate valve. In other embodiments, the second switching valve 14 is a high-pressure ball valve, etc. No limitation is made here.

[0065] Optionally, the dry carbon dioxide snow cleaning system includes a housing (not shown in the figure) that covers the periphery of the liquid carbon dioxide unit 1 and the compressed gas unit 2. The housing protects the liquid carbon dioxide unit 1 and the compressed gas unit 2, ensuring their stable operation. Since liquid carbon dioxide may exhibit low-temperature characteristics, and the compressed gas unit 2 presents pressure-related safety risks, the housing provides isolation, reducing potential risks to operators. Furthermore, integrating the liquid carbon dioxide unit 1 and the compressed gas unit 2 into a single unit facilitates the installation, transportation, and overall management of the cleaning system.

[0066] The following is combined Figure 1 and Figure 2 The working principle of a dry carbon dioxide snow cleaning system is explained below:

[0067] Compressed air passes sequentially through the first gas filter 211, the first regulating valve 212, the first switching valve 23, and the heating element 24 before reaching the second inlet 32 ​​of the nozzle 3. Simultaneously, the compressed air passes sequentially through the second gas filter 221 and the second regulating valve 222 before reaching the control port of the booster pump 11, causing the inlet of the booster pump 11 to open. At this time, liquid carbon dioxide enters the booster pump 11 through the inlet and passes sequentially through the cooling filter 12, the pressure stabilizing element 13, and the second switching valve 14 before reaching the first inlet 31 of the nozzle 3. The liquid carbon dioxide and compressed air mix in the nozzle 3 and then solidify into snowflake-shaped dry ice particles. These particles are carried by the high-pressure compressed air and sprayed out at high speed from the cleaning port 33. The surface of the part to be cleaned is cleaned through the impact and sublimation cooling effect of the dry ice particles.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A dry carbon dioxide snow cleaning system characterized by, include: A liquid carbon dioxide unit (1) is used to provide stable liquid carbon dioxide; The compressed gas unit (2) includes a first compressed gas supply component (21), a first switching valve (23), and a heating element (24). Along the flow direction of the compressed gas, the first compressed gas supply component (21), the first switching valve (23), and the heating element (24) are connected in sequence and communicate with each other. The nozzle (3) is provided with a first inlet (31), a second inlet (32) and a cleaning port (33). The liquid carbon dioxide unit (1) is connected to the first inlet (31) through a first pipeline. The heating element (24) is connected to the second inlet (32) through a second pipeline. The cleaning port (33) is connected to the first inlet (31) and the second inlet (32). The liquid carbon dioxide and the compressed gas can be sprayed out from the cleaning port (33) to clean the surface of the part to be cleaned.

2. The dry carbon dioxide snowflakes cleaning system according to claim 1, wherein, The first compressed gas supply assembly (21) includes: A gas source component, wherein the gas source component is used to provide compressed gas; The first gas filter (211) has its inlet connected to the gas source via a third pipeline and its outlet connected to the inlet of the first switch valve (23) via a fourth pipeline. The first regulating valve (212) is disposed on the fourth pipeline.

3. The dry carbon dioxide snowflakes cleaning system according to claim 1, wherein, The compressed gas unit (2) further includes a second compressed gas supply assembly (22), which includes: A gas source component, wherein the gas source component is used to provide compressed gas; The second gas filter (221) has its inlet connected to the gas source via a fifth pipeline and its outlet connected to the liquid carbon dioxide unit (1) via a sixth pipeline. The second regulating valve (222) is disposed on the sixth pipeline to control the flow of liquid carbon dioxide in the liquid carbon dioxide unit (1) to the first inlet (31).

4. The dry carbon dioxide snowflakes cleaning system according to claim 3, wherein, The second regulating valve (222) is a piezoelectric valve.

5. The dry carbon dioxide snow cleaning system according to any one of claims 1-4, characterized in that, The liquid carbon dioxide unit (1) includes: A liquid source component, wherein the liquid source component is used to provide liquid carbon dioxide; At least one booster pump (11), the inlet of at least one of the booster pumps (11) is connected to the outlet of the liquid source component through a seventh pipeline, and the outlet of the booster pump (11) is connected to the first inlet (31) through the first pipeline.

6. The dry carbon dioxide snow cleaning system according to claim 5, characterized in that, There are two booster pumps (11), and the two booster pumps (11) are connected in parallel.

7. The dry carbon dioxide snow cleaning system according to claim 5, characterized in that, The liquid carbon dioxide unit (1) further includes: Cooling filter (12) is disposed on the first pipeline.

8. The dry carbon dioxide snow cleaning system according to claim 5, characterized in that, The liquid carbon dioxide unit (1) further includes: A pressure stabilizing component (13) is disposed on the first pipeline.

9. The dry carbon dioxide snow cleaning system according to claim 8, characterized in that, The voltage stabilizer (13) is an energy storage device.

10. The dry carbon dioxide snow cleaning system according to any one of claims 1-4, characterized in that, The dry carbon dioxide snowflake cleaning system includes: The outer casing covers the outer periphery of the liquid carbon dioxide unit (1) and the compressed gas unit (2).

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