CN113739473B - A dry ice sublimation cooling spray chamber device - Google Patents

Abstract

The invention discloses a dry ice sublimation cooling spray chamber device, which is composed of a dry ice spray chamber and an inner and outer nesting combination of a thermal insulation shell; the thermal insulation shell is provided with a nozzle pipe extending downward at the entrance, and a nozzle channel is formed at the inner diameter of the nozzle pipe ; The dry ice spray chamber is sleeved on the nozzle tube by the through hole, and there is a backflow gap between the through hole and the nozzle tube, and a shunt structure is arranged at the backflow gap; the top and side of the dry ice spray chamber and the thermal insulation shell are left. There is a gap, and an outlet annular channel is formed at the gap; the bottom of the thermal insulation shell is provided with an outlet that communicates with the outlet annular channel; the top of the dry ice spray chamber is provided with a downward guide seat, and the guide seat is provided with a conical inner channel, The conical inner channel and the conical-like outer contour of the nozzle tube form a gradually expanding return channel; there is also a gap between the guide seat and the top of the dry ice spray chamber, and the gap communicates with the dry ice spray chamber to form a return annular channel. The invention can improve the cooling efficiency of dry ice spray and save the amount of dry ice.

Description

A dry ice sublimation cooling spray chamber device

technical field

The invention relates to the technical field of dry ice phase change spray cooling, in particular to a dry ice sublimation cooling spray chamber device.

Background technique

With the demands of computer, communication, military, aerospace and civil markets, electronic technology has developed rapidly. The packaging density of electronic devices continues to increase, the heat flux density continues to increase, and electronic products continue to develop in the direction of miniaturization, with higher power and smaller external dimensions. These trends in electronic products make the problem of overheating of electronic devices more and more prominent. Overheating of electronic equipment is one of the main reasons for the failure of electronic products, which seriously limits the improvement of the performance and reliability of electronic products, and also reduces the working life of the equipment. Therefore, the temperature rise in electronic equipment must be controlled, and it is the key to use good heat dissipation measures to effectively solve this problem. However, although traditional cooling devices (such as air cooling and water cooling) can meet the needs of temperature control, their heat dissipation The capacity is far from meeting the requirements of future development.

In order to design and study an efficient cooling and heat dissipation system and obtain greater cooling capacity, phase change cooling technology has entered the field of vision of scientists. Most of the traditional spray cooling technology uses liquid working medium as the refrigerant, the system is more complex, and the requirements for the application environment and objects are also relatively high. However, the application of dry ice sublimation as a heat transfer mechanism is rarely studied in spray cooling technology. Solid carbon dioxide, i.e. dry ice, has a low sublimation temperature of -78.5°C, but its latent heat of sublimation is 573kJ/kg, and sublimation is a process in which a solid state absorbs a large amount of heat and is directly transformed into a gaseous state. Compared with the liquid state, the gaseous state is used in complex application systems. It is easier to handle, and the dry ice sublimation spray cooling technology has a high application prospect in the field of thermal control.

However, experiments show that when dry ice spray cooling is performed on the surface of the heat source, the heat exchange between dry ice sublimation and the environment is very large, thereby reducing the efficiency of dry ice spray cooling. At present, there is no heat preservation for dry ice spray cooling to improve heat exchange efficiency. spray chamber device.

The invention patent of publication number CN110381700A discloses a spray chamber and steam chamber integrated phase change cooling device and system, the device includes a cavity, a spray chamber liquid inlet pipe, a spray chamber liquid outlet pipe and a spray orifice plate located in the cavity and an array nozzle, the cavity includes a spray chamber and a vapor chamber, the spray orifice plate divides the spray chamber into a buffer chamber and a spray chamber, the liquid inlet pipe of the spray chamber is connected with the buffer chamber, the liquid outlet pipe of the spray chamber is connected with the spray chamber, and the array nozzle is set The orifice plate is located on one side of the spray chamber, a plurality of through holes connecting the buffer chamber and the array nozzles are arranged on the orifice plate, the steam chamber is arranged opposite the array nozzle, and the steam chamber is sealed with a Phase change working substance. The steam chamber and the spray chamber are integrally connected. The steam chamber can spread the high heat flux generated by the electronic components to the spray surface evenly in time. The working medium inside the spray chamber is sprayed on the spray surface at a high speed through the array nozzle. The tropics take a lot of heat to achieve the cooling effect of electronic components.

The invention patent of publication number CN105960145B discloses a closed spray cooling device with adjustable inclination angle. The spray chamber is a sealable cavity made of transparent plexiglass and stainless steel plate. The condensing coil, the inclined spray bracket is fixedly connected to the stainless steel plate at the bottom of the cavity, the nozzle is connected to the inclined spray bracket, and the spray chamber is respectively connected with the cooling water inlet pipe, the cooling water return pipe, the condensed water inlet pipe, the condensed water The return pipe, the vacuum pump interface and the pressure sensor are connected, and the cooling water inlet pipe is connected to the nozzle through a stainless steel braided hose; the simulated heat source is located just below the nozzle, and the simulated heat source is connected to the electric control cabinet and the data acquisition device respectively. In the vacuum environment provided by the vacuum pump, the oblique jet is used to eliminate the central stagnation area of the heat source surface. Combined with the micro-structured surface, the heat dissipation capacity of the spray cooling can be significantly improved, the package volume of the system can be reduced, and a visual experiment is provided for the comprehensive study of the parameters affecting the heat transfer of the spray cooling. device.

However, the above technical solution is not applicable to the dry ice spray cooling technology, and cannot achieve the thermal insulation effect of the dry ice spray cooling system.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dry ice sublimation cooling spray chamber device.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A dry ice sublimation cooling spray chamber device, the dry ice sublimation cooling spray chamber device is composed of a dry ice spray chamber and an inner and outer nesting combination of a thermal insulation shell, and a heat source is located at the bottom of the dry ice spray chamber;

The thermal insulation shell is provided with an inlet, and the thermal insulation shell is provided with a nozzle tube extending downward at the inlet, a nozzle channel is formed at the inner diameter of the nozzle tube, and the outer diameter of the nozzle tube forms a cone-like outer contour with a small upper part and a large lower part; the dry ice nozzle passes through The inlet and nozzle channel enter the dry ice spray chamber, and the dry ice nozzle is wrapped by the nozzle channel;

The top of the dry ice spray chamber is provided with a through hole, the dry ice spray chamber is sleeved on the nozzle tube by the through hole, and there is a return gap between the through hole and the nozzle tube, and a shunt structure is arranged at the return gap to control the gas return flow. ;

A gap is left between the top and side of the dry ice spray chamber and the thermal insulation shell, and an outlet annular channel is formed at the gap; the bottom of the thermal insulation shell is provided with an outlet that communicates with the outlet annular channel;

The top of the dry ice spray chamber is provided with a downward guide seat, the guide seat is provided with a conical inner channel, the guide seat is sleeved outside the nozzle tube by the conical inner channel, and the conical inner channel and the nozzle tube The conical-like outer contour forms a gradually expanding return channel; there is also a gap between the guide seat and the top of the dry ice spray chamber, and the gap communicates with the dry ice spray chamber to form a return annular channel.

The splitting structure is composed of two semi-circular annular splitting plates, which are located on the upper side of the top of the dry ice spray chamber and on both sides of the nozzle tube respectively. become smaller or larger.

The two semi-circular annular distribution plates are respectively connected with upwardly protruding grips, and a horizontal chute is arranged on the heat preservation shell corresponding to the grips, and the grips are respectively passed through the corresponding horizontal chute.

The conical-like outer contour of the nozzle tube is composed of an upper cylindrical section and a lower conical section. The top through hole of the dry ice spray chamber is sleeved at the cylindrical section, and the conical inner channel of the guide seat is sleeved in the cone. shape segment.

The bottom of the dry ice spray chamber is provided with a convex edge that protrudes horizontally outward, and the bottom of the thermal insulation shell is sealed with the convex edge.

The bottom and top of the dry ice spray chamber are rounded structures.

The bottom of the dry ice spray chamber is provided with a heat source surface placement opening, which is closely combined with the heat source surface horizontally.

The nozzle channel is a cylindrical channel.

The outlets are symmetrically arranged around the bottom of the thermal insulation shell.

The beneficial effects of the present invention are:

By adopting the above technical solution, the dry ice nozzle is connected to the dry ice spray chamber, and the outside of the nozzle channel is provided with a gradually expanding return channel to form a carbon dioxide gas return channel. The return annular channel with a certain rounded angle flows to the top of the device, the splitting structure set at the top of the spray chamber divides the gas, and part of the carbon dioxide cooling gas enters the gradually expanding return channel to form a protective layer of the carbon dioxide cooling gas curtain wall, which acts as a protective layer for the nozzle. For dry ice protection, another part of the carbon dioxide cooling gas flows into the outlet annular channel outside the dry ice spray chamber to form a protective layer of cooling gas outside the spray chamber, and finally is discharged to the outside world through the four outlets at the bottom of the thermal insulation shell.

The invention can improve the heat exchange efficiency of dry ice sublimation spray cooling. On the one hand, the distance between the spray chamber and the shell of the heat preservation device constitutes a cooling gas protective layer outside the spray chamber, and the outer cooling gas protective layer of the spray chamber plays a thermal insulation role for the internal spray chamber. On the other hand, part of the gas is re-sprayed to the surface of the heat source through two semi-circular distribution plates, and a carbon dioxide cooling gas curtain wall is formed at the outlet of the recirculation gradually expanding flow channel, which reduces the heat exchange between the dry ice at the nozzle and the environment and improves the cooling efficiency of dry ice spray. , save the amount of dry ice.

Description of drawings

Accompanying drawing 1 is the sectional structure schematic diagram of the thermal insulation shell in the embodiment of the present invention;

2 is a schematic cross-sectional structure diagram of a dry ice spray chamber in an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional structure diagram of the dry ice spray chamber and the thermal insulation shell combined in the embodiment of the present invention.

The reference numerals of each part in the figure: 1—insulation shell; 2—dry ice spray chamber; 101—nozzle passage; 102—chute; 103—outlet; 201—semi-circular diverter plate; - guide seat; 204 - heat source surface placement port; 205 - handle; 301 - gradually expanding return channel; 302 - return annular channel; 303 - outlet annular channel.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

As shown in FIGS. 1 to 3 , a dry ice sublimation cooling spray chamber device of this embodiment is composed of a dry ice spray chamber 2 and a thermal insulation shell 1 nested inside and outside. The bottom of the dry ice spray chamber 2 is left with a heat source surface for placement The mouth 204 is closely integrated with the surface of the square heat source.

The thermal insulation shell 1 is provided with a circular inlet, and the thermal insulation shell is provided with a nozzle pipe extending downward at the circular inlet, a cylindrical nozzle channel 101 is formed at the inner diameter of the nozzle pipe, and the outer diameter of the nozzle pipe is formed with a small top and a large bottom. Cone-like outer contour; the dry ice nozzle enters the dry ice spray chamber through the circular inlet and nozzle channel, the diameter of the nozzle channel 101 is slightly larger than the diameter of the dry ice nozzle, the dry ice nozzle is wrapped by the nozzle channel 101, and the dry ice is ejected through the dry ice nozzle and hits the simulated hot surface , the cooling gas spreads around along the surface of the simulated heat source.

The top of the dry ice spray chamber 2 is provided with a through hole, the dry ice spray chamber 2 is sleeved on the nozzle tube by the through hole, and there is a return gap between the through hole and the nozzle tube, and a shunt structure is arranged at the return gap to control the gas. return flow.

There is a gap between the top and side of the dry ice spray chamber 2 and the thermal insulation shell 1, and an outlet annular channel 303 is formed at the gap; the bottom of the thermal insulation shell 1 is provided with an outlet 103 that communicates with the outlet annular channel 303, and the outlet 103 is in the thermal insulation shell. 1 is arranged symmetrically around the bottom of the 1.

The top of the dry ice spray chamber 2 is provided with a downward guiding seat 203, and a conical inner channel is arranged on the guiding seat 203. The guiding seat is sleeved outside the nozzle tube by the conical inner channel 202, and the conical inner channel 202 and the conical-like outer contour of the nozzle tube form a gradually expanding return channel 301; there is also a gap between the guide seat 203 and the top of the dry ice spray chamber, and the gap communicates with the dry ice spray chamber to form a return annular channel 302.

In this embodiment, the flow splitting structure is composed of two semi-circular annular flow splitting plates 201. The two semi-circular annular flow splitting plates 201 are located on the upper side of the top of the dry ice spray chamber and on both sides of the nozzle tube respectively. The two semi-circular annular flow splitting plates 201 are close to each other. Or away from it, make the reflow gap smaller or larger. The two semi-circular annular distribution plates 203 are completely close to the nozzle tube, and the returnable gap is completely closed.

The two semi-circular diverter plates 201 are respectively connected with handles 205 extending upwards. The thermal insulation shell 1 is provided with horizontal chute 102 corresponding to the handle 202 , and the handles 202 are respectively passed through the corresponding horizontal chute 102 . The horizontal moving handle 205 can control the discharge and recovery amount of the dry ice cooling gas, and the horizontal chute 10 is used to limit the horizontal moving space of the handle.

In this embodiment, the conical-like outer contour of the nozzle tube is composed of an upper cylindrical section and a lower conical section, the top through hole of the dry ice spray chamber 2 is sleeved at the cylindrical section, and the conical shape of the guide seat 202 is inside the conical section. The channel is sleeved at the tapered section.

In this embodiment, the bottom of the dry ice spray chamber 2 is provided with a convex edge that protrudes horizontally outward, and the bottom of the thermal insulation shell 1 is sealed with the convex edge.

In this embodiment, both the bottom and the top of the dry ice spray chamber 2 are rounded to a certain extent, so as to reduce the flow resistance of the cooling gas.

The working principle of the present invention is as follows:

The dry ice nozzle enters the dry ice spray chamber 2 through the circular inlet and the nozzle channel. The dry ice jet at the nozzle hits the surface of the heat source, and the cooling gas rapidly diffuses along the surface of the heat source along the return annular channel 302 to the top of the dry ice spray chamber, and the bottom and top of the return annular channel 302 All have rounded corners to reduce the flow resistance of the cooling gas and reduce the influence of the flow channel on the flow rate of the cooling gas.

When the dry ice cooling gas flows to the top along the return annular channel 302, the top of the dry ice spray chamber is provided with a semi-circular annular distribution plate 201. The horizontal movement of the handle 205 can control the discharge and recovery of the dry ice cooling gas. The handle 205 is provided with a horizontal The chute 102 is used to limit the horizontal movement space of the handle.

When the cooling gas flows to the top of the dry ice spray chamber, part of the flow is divided into the expanding return channel 301, the cooling gas wraps the nozzle, and forms a conical cooling gas curtain wall at the nozzle outlet, reducing the exchange of cooling gas and air at the nozzle outlet. The heat is finally sprayed again to hit the surface of the heat source to improve the utilization rate of the dry ice cooling gas.

The rest of the cooling gas flows through the outlet annular channel 303 to the outlet 103 and finally to the environment. It should be emphasized that when the dry ice cooling gas flows in the outlet annular channel 303, a second annular cooling gas curtain wall will be formed to keep the dry ice spray chamber warm, reduce its heat exchange with the surrounding environment, and improve the dry ice sublimation cooling capacity.

The working process of the present invention is as follows:

After the dry ice nozzle enters the spray chamber through the nozzle channel 101 , the dry ice nozzle is surrounded by the nozzle channel 101 . The dry ice is ejected from the nozzle and impinges on the surface of the heat source, and the cooling gas moves to the top of the dry ice spray chamber 1 along the return annular channel 302. The top of the spray chamber is provided with two semi-circular distribution plates 201, and the cooling gas discharge and recovery are controlled by adjusting the handle. For the amount of reuse, part of the gas flows out of the outlet through the return annular channel 302, and a tapered carbon dioxide cooling gas curtain wall protective layer is formed at the nozzle outlet to keep the dry ice nozzle warm, and spray it again to the surface of the heat source to cool it down, achieving dry ice cooling. The purpose of gas recycling. The rest of the cooling gas enters the outlet annular channel 303 outside the dry ice spray chamber 2, and forms a protective layer of cooling gas outside the spray chamber again, reducing the heat exchange between the dry ice cooling gas in the spray chamber and the environment, and the gas finally passes through the outlet of the thermal insulation shell 1. discharge.

The invention can improve the heat exchange efficiency of dry ice sublimation spray cooling. On the one hand, the distance between the spray chamber and the shell of the heat preservation device constitutes a cooling gas protective layer outside the spray chamber, and the outer cooling gas protective layer of the spray chamber plays a thermal insulation role for the internal spray chamber. On the other hand, part of the gas is re-sprayed to the surface of the heat source through two semi-circular distribution plates, and a carbon dioxide cooling gas curtain wall is formed at the outlet of the recirculation gradually expanding flow channel, which reduces the heat exchange between the dry ice at the nozzle and the environment and improves the cooling efficiency of dry ice spray. , save the amount of dry ice.

The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from the Any modification or partial replacement of the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left", "right", "front", "rear", "upper", "lower", etc. are based on those shown in the accompanying drawings The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated for a specific orientation, and therefore should not be construed as protecting the content of the present invention limits.

Claims (9)

1. A dry ice sublimation cooling spraying chamber device which is characterized in that: the dry ice sublimation cooling spraying chamber device is formed by combining a dry ice spraying chamber and a heat preservation shell in an internally-externally nested manner, and a heat source is positioned at the bottom of the dry ice spraying chamber;

the heat-insulating shell is provided with an inlet, the heat-insulating shell is provided with a nozzle pipe extending downwards at the inlet, a nozzle channel is formed at the inner diameter of the nozzle pipe, and the outer diameter of the nozzle pipe forms a conical outer profile with a small upper part and a large lower part; the dry ice nozzle enters the dry ice spraying chamber through the inlet and the nozzle channel, and the dry ice nozzle is wrapped by the nozzle channel;

the top of the dry ice spraying chamber is provided with a through hole, the dry ice spraying chamber is sleeved on the nozzle pipe through the through hole, a backflow gap is reserved between the through hole and the nozzle pipe, and a flow dividing structure is arranged at the backflow gap to control the gas backflow amount;

gaps are reserved between the top and the side of the dry ice spraying chamber and the heat preservation shell, and an outlet annular channel is formed in the gaps; the bottom of the heat-insulating shell is provided with an outlet communicated with the outlet annular channel;

the top of the dry ice spraying chamber is provided with a downward flow guide seat, a conical inner channel is arranged on the flow guide seat, the flow guide seat is sleeved outside the nozzle pipe through the conical inner channel, and the conical inner channel and the conical outer contour of the nozzle pipe form a gradually-expanding type backflow channel; a gap is also reserved between the flow guide seat and the top of the dry ice spraying chamber, and the gap is communicated with the dry ice spraying chamber to form a backflow annular channel.

2. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 1, wherein: the shunting structure comprises two semicircular annular shunting plates, the two semicircular annular shunting plates are positioned on the upper side of the top of the dry ice spraying chamber and positioned on two sides of the nozzle pipe respectively, and the two semicircular annular shunting plates are close to or far away from each other to reduce or enlarge the backflow gap.

3. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 2, wherein: the two semicircular annular splitter plates are respectively connected with a grab handle extending upwards, a horizontal sliding groove is arranged at the position, corresponding to the grab handle, on the heat insulation shell, and the grab handles respectively penetrate through the corresponding horizontal sliding grooves.

4. A dry ice sublimation cooling spray chamber apparatus according to any one of claims 1-3, wherein: the conical outer contour of the nozzle pipe is composed of a cylindrical section at the upper part and a conical section at the lower part, a through hole at the top of the dry ice spraying chamber is sleeved at the cylindrical section, and a conical inner channel of the flow guide seat is sleeved at the conical section.

5. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 4, wherein: the bottom of the dry ice spraying chamber is provided with a convex edge protruding outwards horizontally, and the bottom of the heat-insulating shell is connected with the convex edge in a sealing mode.

6. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 4, wherein: the bottom and the top of the dry ice spraying chamber are of a rounded corner structure.

7. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 4, wherein: and a heat source surface placing opening is reserved at the bottom of the dry ice spraying chamber and is horizontally and tightly combined with the heat source surface.

8. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 4, wherein: the nozzle passage is a cylindrical passage.

9. A dry ice sublimation cooling spray chamber apparatus as claimed in claim 4, wherein: the outlets are symmetrically arranged around the bottom of the heat preservation shell.

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