Liquid nitrogen refrigeration heat exchanger

Abstract

The present application relates to a liquid nitrogen refrigeration heat exchanger, which belongs to the technical field of heat exchangers. The liquid nitrogen refrigeration heat exchanger includes: a carrying plate, a coil and a liquid nitrogen spray rack; the carrying plate includes a bottom plate and side plates formed around the bottom plate, the bottom plate and the side plates form a storage space for accommodating the coil, the coil is arranged on the bottom plate, the liquid nitrogen spray rack is used to spray liquid nitrogen toward the coil, and the carrying plate is used to carry liquid nitrogen so that the coil is immersed in liquid nitrogen. According to the liquid nitrogen refrigeration heat exchanger of the embodiment of the present application, the carrying of the coil and the collection of liquid nitrogen are realized through the accommodating space of the carrying plate, so that the coil can be immersed in liquid nitrogen, and the liquid nitrogen is reused. At the same time, the contact area between the coil and the liquid nitrogen is increased, so that the heat exchange of the coil is uniform, thereby improving the refrigeration efficiency and saving energy.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and in particular to a liquid nitrogen refrigeration heat exchanger. Background Art

[0002] Liquid nitrogen refrigeration is increasingly used in the industrial field due to its fast cooling speed. Currently, the most commonly used method is to spray liquid nitrogen on the surface of the cooling object, but liquid nitrogen cannot be fully vaporized during the vaporization process, and the remaining liquid will be lost and wasted. In addition, ordinary spraying is uneven and the refrigeration efficiency is not high. Summary of the invention

[0003] The purpose of the present application is to provide a liquid nitrogen refrigeration heat exchanger to address the above-mentioned problems, which can collect unvaporized liquid nitrogen, immerse the coil in liquid nitrogen, and reuse the liquid nitrogen, thereby improving the refrigeration efficiency.

[0004] According to an embodiment of one aspect of the present application, a liquid nitrogen refrigeration heat exchanger includes a carrier plate, a coil and a liquid nitrogen spray rack; the carrier plate includes a bottom plate and side plates formed around the bottom plate, the bottom plate and the side plates form a receiving space for receiving the coil, the coil is arranged on the bottom plate, the liquid nitrogen spray rack is used to spray liquid nitrogen toward the coil, and the carrier plate is used to carry liquid nitrogen so that the coil is immersed in liquid nitrogen.

[0005] According to the liquid nitrogen refrigeration heat exchanger of the embodiment of the present application, the coil is supported and the liquid nitrogen is collected through the accommodating space of the supporting plate, so that the coil can be immersed in liquid nitrogen and the liquid nitrogen is reused. At the same time, the contact area between the coil and the liquid nitrogen is increased, so that the heat exchange of the coil is uniform, thereby improving the refrigeration efficiency and saving energy.

[0006] In addition, the liquid nitrogen refrigeration heat exchanger according to the embodiment of the present application also has the following additional technical features:

[0007] According to some embodiments of the present application, a filling compartment is provided on the bottom plate, and the filling compartment is used to cooperate with the coil and fill the accommodation space.

[0008] In the above embodiment, by setting the filling compartment, the portion of the accommodation space not occupied by the coil is filled, and when spraying liquid nitrogen, the amount of liquid nitrogen is reduced, and the liquid nitrogen level in the accommodation space is raised, so that the coil is easily immersed in liquid nitrogen.

[0009] In some specific embodiments of the present application, the width of an end of the filling compartment away from the bottom plate is smaller than the width of an end of the filling compartment close to the bottom plate.

[0010] In the above embodiment, the shape design of the filling compartment facilitates cooperation with the coil, and facilitates the collection and diversion of liquid nitrogen while reducing the amount of liquid nitrogen.

[0011] According to some embodiments of the present application, the coil has an S-shaped structure, and the coil includes multiple straight tubes. Two adjacent straight tubes are arranged in parallel and connected by an elbow. The filling partition is located between two adjacent straight tubes, and the two straight tubes located at both ends respectively pass through the side panels and extend out of the accommodating space.

[0012] In the above-mentioned embodiment, the structural form of the coil is convenient for increasing the heat exchange surface of the coil and facilitating the arrangement of the filling compartments.

[0013] In some specific embodiments of the present application, solenoid valves are respectively provided at both ends of the coil.

[0014] In the above embodiment, the flow rate of the medium in the coil is controlled by the solenoid valve, so as to facilitate the control of the heat exchange power of the heat exchanger.

[0015] Furthermore, the liquid nitrogen spray rack includes a main bracket and a sub-bracket, the main bracket is provided with a main conveying channel, one end of the main conveying channel is used to be connected to the liquid nitrogen source, and the sub-bracket is provided with multiple sub-conveying channels connected to the main conveying channel, each sub-conveying channel is arranged corresponding to a straight pipe, and each sub-conveying channel is provided with multiple nozzles, and the multiple nozzles are distributed at intervals along the length direction of the straight pipe.

[0016] In the above embodiment, liquid nitrogen is transferred to the branch transfer channel through the main transfer channel, so as to spray liquid nitrogen on the coils at the same time, thereby achieving uniform heat exchange of the coils.

[0017] According to some embodiments of the present application, the carrying plate is provided with a flow guide, one end of which is connected to the upper edge of the side plate and communicates with the accommodating space.

[0018] In the above embodiment, the liquid nitrogen overflowing from the accommodation space is discharged and collected through the guide member, so as to make reasonable use of the liquid nitrogen.

[0019] According to some embodiments of the present application, the liquid nitrogen refrigeration heat exchanger also includes a frame, a plurality of carrying plates are provided, and the plurality of carrying plates are installed on the frame at intervals in the vertical direction. A guide member is provided on the carrying plate, one end of the guide member is connected to the upper edge of the side plate and communicated with the accommodating space, and the guide member is used to guide the liquid nitrogen on the upper carrying plate to the accommodating space of the lower carrying plate.

[0020] In the above embodiment, the plurality of carrier plates are arranged at intervals, thereby improving the heat exchange efficiency of the heat exchanger; and the arrangement of the flow guide member improves the utilization rate of the liquid nitrogen.

[0021] In some specific embodiments of the present application, the guide member includes a first guide section, a second guide section and a third guide section connected in sequence, the first guide section, the second guide section and the third guide section are all hollow structures, the first guide section is installed on the upper edge of the side plate and is connected to the accommodating space, the second guide section is vertically arranged with the first guide section, the third guide section is parallelly arranged with the first guide section, and the third guide section is located below the bottom plate and is located on the same side of the second guide section as the first guide section.

[0022] In the above embodiment, the excess liquid nitrogen in the accommodation space is discharged through the first guide section, and flows from the third guide section to the accommodation space of the lower carrier plate via the second guide section, so as to facilitate the diversion of liquid nitrogen and rationally utilize liquid nitrogen.

[0023] Furthermore, the coils in the supporting plates of two adjacent layers are connected via a connecting pipe.

[0024] In the above embodiment, the coils of two adjacent layers of the carrier plates are connected by connecting pipes, which makes it easy to change the heat exchange capacity of the heat exchanger to meet different heat exchange requirements.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a carrier plate of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application;

[0029] Figure 3 A cross-sectional view of a filling compartment of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of a structure in which a coil of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application is arranged in a carrier plate;

[0031] Figure 5 A schematic diagram of the structure of a liquid nitrogen spray rack for a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application;

[0032] Figure 6 Another structural schematic diagram of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application;

[0033] Figure 7 A schematic structural diagram of a flow guide member of a liquid nitrogen refrigeration heat exchanger provided in an embodiment of the present application.

[0034] Icons: 100-liquid nitrogen refrigeration heat exchanger; 1-carrying plate; 11-bottom plate; 12-side plate; 121-card slot; 122-installation hole; 13-accommodating space; 14-filling compartment; 141-equal width section; 142-variable width section; 2-coil; 21-straight pipe; 22-elbow; 23-solenoid valve; 3-liquid nitrogen spray rack; 31-main bracket; 311-liquid inlet pipe; 312-main pipe; 313-liquid inlet solenoid valve; 32-branch bracket; 321-main branch pipe; 322-branch pipe; 4-flow guide; 41-first flow guide section; 42-second flow guide section; 43-third flow guide section; 5-rack; 6-connecting pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The following describes a liquid nitrogen refrigeration heat exchanger 100 according to an embodiment of one aspect of the present application with reference to the drawings.

[0041] like Figure 1 As shown, the liquid nitrogen refrigeration heat exchanger 100 according to the embodiment of the present application includes: a carrier plate 1, a coil 2 and a liquid nitrogen spray rack 3.

[0042] Specifically, the carrier plate 1 includes a bottom plate 11 and side plates 12 formed around the bottom plate 11, the side plates 12 are arranged on the upper surface of the bottom plate 11, the bottom plate 11 and the side plates 12 form a receiving space 13 for receiving the coil 2, the coil 2 is arranged on the bottom plate 11 and is located in the receiving space 13; the liquid nitrogen spray rack 3 is used to spray liquid nitrogen toward the coil 2, and the carrier plate 1 is used to carry liquid nitrogen so that the coil 2 is immersed in the liquid nitrogen.

[0043] According to the liquid nitrogen refrigeration heat exchanger 100 of the embodiment of the present application, when the liquid nitrogen spray rack 3 sprays liquid nitrogen toward the coil 2, the ungasified liquid nitrogen gathers in the accommodating space 13, and the liquid nitrogen is reused. As the spraying time of the liquid nitrogen increases, the liquid level of the liquid nitrogen in the accommodating space 13 gradually rises, so that the coil 2 is immersed in the liquid nitrogen, the contact area and contact time between the coil 2 and the liquid nitrogen are increased, the heat exchange of the coil 2 is uniform, the refrigeration efficiency is improved, and the energy saving effect is achieved.

[0044] It should be pointed out that the heat exchanger is used to absorb heat through the vaporization of liquid nitrogen to absorb the heat of the hot flowing medium in the coil 2, achieve heat exchange, and reduce the temperature of the flowing medium in the coil 2. That is, the coil 2 is used to pass a high-temperature flowing medium and discharge a low-temperature flowing medium. While the high-temperature flowing medium flows in the coil 2, the heat of the flowing medium is taken away by the action of the vaporization of liquid nitrogen, thereby reducing the temperature of the flowing medium. The coil 2 in the embodiment of the present application is a metal tube with good heat dissipation performance, which facilitates the heat transfer of the medium inside the coil 2 and prevents the coil 2 from cracking due to large temperature changes of the medium. Different flowing media are selected to flow in the coil 2 according to the requirements of the use environment.

[0045] The structures and connection relationships of the components of the liquid nitrogen refrigeration heat exchanger 100 according to the embodiment of the present application are described below with reference to the accompanying drawings.

[0046] like Figure 2As shown, the carrier plate 1 includes a bottom plate 11 and a side plate 12, the lower end of the side plate 12 is sealed and connected to the upper surface of the bottom plate 11, and the side plate 12 is arranged around the bottom plate 11 and forms a receiving space 13 with the bottom plate 11. The bottom plate 11 is a rectangular plate, and the side plates 12 include four, and the four side plates 12 are connected end to end to form a receiving space 13 with an upper opening with the bottom plate 11.

[0047] The bottom plate 11 is provided with a filling compartment 14, which is used to cooperate with the coil 2 and fill the accommodation space 13. The filling compartment 14 is arranged in an S-shape in the accommodation space 13 to adapt to the shape of the coil 2.

[0048] In order to better cooperate with the coil 2 to fill the accommodating space 13 and reduce the amount of liquid nitrogen, the width of the end (upper end) of the filling compartment 14 away from the bottom plate 11 is smaller than the width of the end (lower end) of the filling compartment 14 close to the bottom plate 11, that is, in the cross section of the filling compartment 14, the width of the upper end of the cross section is smaller than the width of the lower end.

[0049] As an optional method of this application, Figure 3 As shown, the filling compartment 14 includes an integrally formed equal-width section 141 and a variable-width section 142. The equal-width section 141 is located above the variable-width section 142. The width of the equal-width section 141 is the same as the minimum width of the variable-width section 142. This structural design can not only reduce the filling amount of liquid nitrogen in the accommodating space 13, but also cooperate with the adjacent filling compartment 14 to realize the collection and diversion of liquid nitrogen, so that the coil 2 can be immersed in liquid nitrogen.

[0050] like Figure 4 As shown, the coil 2 is an S-shaped structure, and the coil 2 includes a plurality of straight tubes 21. Two adjacent straight tubes 21 are arranged in parallel and connected by a 90° elbow 22. The structural form of the coil 2 is convenient for increasing the heat exchange surface of the coil 2 and for realizing the heat exchange of the medium in the coil 2. The filling compartment 14 is located between two adjacent straight tubes 21. By setting the filling compartment 14, the unoccupied part of the coil 2 in the accommodating space 13 is filled. When spraying liquid nitrogen, the amount of liquid nitrogen is reduced, and the liquid nitrogen level in the accommodating space is increased, so that the coil 2 is convenient for being immersed in liquid nitrogen.

[0051] Solenoid valves 23 are provided on the straight pipes 21 at both ends of the coil 2. The flow rate of the medium in the coil 2 is controlled by the solenoid valves 23, so as to facilitate the control of the heat exchange power of the heat exchanger.

[0052] When the coil 2 is assembled with the carrier plate 1, the coil 2 is placed on the bottom plate 11, the straight tube 21 of the coil 2 is located between the two filling compartments 14, the elbow 22 is located in the gap between the filling compartment 14 and the side plate 12, and the straight tube 21 at the end passes through the side plate 12 and extends out of the accommodation space 13; the solenoid valve 23 is located outside the accommodation space 13, which is convenient for replacing the solenoid valve 23 and preventing the solenoid valve 23 from being immersed in liquid nitrogen. Correspondingly, the side plate 12 is provided with a mounting hole 122 (such as Figure 2 When installing, firstly pass the coil 2 through the installation hole 122, seal the connection between the side plate 12 and the coil 2, and then place the assembled coil 2 on the bottom plate 11. After the position of the coil 2 is determined, seal the side plate 12 and the bottom plate 11.

[0053] The liquid nitrogen spray rack 3 is arranged above the coil 2 and is used to be installed on a support member (the supporting structure of the equipment, not marked in the figure) so that the liquid nitrogen can be sprayed on the coil 2. Figure 5 As shown, the liquid nitrogen spray rack 3 includes a main bracket 31 and a sub-bracket 32. The main bracket 31 is provided with a main conveying channel, one end of which is used to be connected to a liquid nitrogen source, and the sub-bracket 32 ​​is provided with a plurality of sub-conveyor channels connected to the other end of the main conveying channel, and the sub-conveyor channels are connected to the main conveying channel; each sub-conveyor channel is provided corresponding to a straight pipe 21, and each sub-conveyor channel is provided with a plurality of nozzles (not marked in the figure), and the plurality of nozzles are spaced apart along the length direction of the straight pipe 21. The nozzles on the sub-bracket 32 ​​are arranged so that the liquid nitrogen is evenly sprayed to the straight pipe 21, which facilitates uniform heat exchange of the medium in the coil 2.

[0054] It should be noted that the height of the liquid nitrogen spray rack 3 relative to the coil 2 is determined according to the spray path and spray effect of the nozzle, and this application does not limit it. Optionally, the liquid nitrogen refrigeration heat exchanger 100 also includes an adjustment mechanism (not shown in the figure), which is used to adjust the height of the liquid nitrogen spray rack 3 relative to the coil 2. According to actual needs, the height of the liquid nitrogen spray rack 3 is adjusted, thereby changing the distance between the liquid nitrogen spray rack 3 and the coil 2 to meet the spraying needs.

[0055] As an optional method of this application, Figure 5As shown, the sub-branch 32 is provided with two branch units, and the two branch units are arranged side by side. Each branch unit includes a main branch pipe 321 and a plurality of branch pipes 322 connected to the main branch pipe 321. The main branch pipe 321 extends along the length direction of the main bracket 31, and the branch pipes 322 are arranged vertically with the main branch pipe 321, and the branch pipes 322 constitute a sub-transport channel. The main bracket 31 includes a liquid inlet pipe 311 and a main pipe 312 connected to the liquid inlet pipe 311. The liquid inlet pipe 311 is used to be connected to a liquid nitrogen source. The liquid inlet pipe 311 is provided with a liquid inlet solenoid valve 313 to control the flow of liquid nitrogen in the liquid inlet pipe 311; the main pipe 312 is respectively connected to the two main branches 321, and the main pipe 312 constitutes a main transport channel. The arrangement of the two sub-branch 32 facilitates the replacement and maintenance of the branch pipe 322, and at the same time, the liquid nitrogen can be synchronously transported in the two main branches 321, thereby improving the transportation efficiency of the liquid nitrogen.

[0056] It should be pointed out that in other embodiments of the present application, a plurality of spray holes (not shown in the figure) are provided on each sub-conveyance channel of the liquid nitrogen spray rack 3, and the spray holes replace the nozzles to spray liquid nitrogen, thereby saving the installation time of the nozzles.

[0057] Furthermore, in order to discharge the liquid nitrogen in the containing space 13, as Figure 1 As shown, the carrier plate 1 is provided with a guide member 4, one end of which is connected to the upper edge of the side plate 12 and communicated with the accommodating space 13. The guide member 4 is used to guide the excess liquid nitrogen in the accommodating space 13 to avoid waste of liquid nitrogen; when the amount of liquid nitrogen in the accommodating space 13 is excessive and about to overflow, the excess liquid nitrogen can be guided out through the guide member 4 to collect the excess liquid nitrogen.

[0058] In order to facilitate the placement of multiple carrier plates 1, the liquid nitrogen refrigeration heat exchanger 100 also includes a frame 5, such as Figure 6 As shown, a plurality of carrier plates 1 are arranged at intervals along the vertical direction on the frame 5. The support and positioning of the carrier plates 1 are achieved by the frame 5, so as to ensure the installation position of the carrier plates 1.

[0059] like Figure 6 As shown, four guide members 4 are provided on each carrier plate 1, one end of the guide member 4 is connected to the upper edge of the side plate 12, and is in communication with the accommodation space 13, and the guide member 4 is used to guide the liquid nitrogen in the upper carrier plate 1 to the accommodation space 13 of the lower carrier plate 1, so as to realize the rational use of liquid nitrogen, reduce the amount of liquid nitrogen used for heat exchange of the coil 2 in the lower carrier plate 1, and save energy. In other embodiments of the present application, the number of guide members 4 of each carrier plate 1 can be multiple, and different numbers of guide members 4 are selected according to actual conditions to meet the diversion of liquid nitrogen in the carrier plate 1.

[0060] In some specific embodiments of the present application, Figure 7As shown, the guide member 4 includes a first guide section 41, a second guide section 42 and a third guide section 43 connected in sequence, and the first guide section 41, the second guide section 42 and the third guide section 43 are all hollow structures. The first guide section 41 is installed on the upper edge of the side plate 12 (such as Figure 2 As shown, the upper edge of the side plate 12 is provided with a slot 121 that matches the first guide section 41, and the first guide section 41 is arranged in the slot 121), and the bottom surface of the first guide section 41 is located in the accommodation space 13 (that is, the bottom surface of the first guide section 41 is lower than the upper end surface of the side plate 12); the second guide section 42 is arranged vertically with the first guide section 41, and the third guide section 43 is arranged parallel with the first guide section 41, and the third guide section 43 is located below the bottom plate 11, and is located on the same side of the second guide section 42 as the first guide section 41. When the liquid nitrogen level in the accommodation space 13 rises to the bottom surface of the first guide section 41, the liquid nitrogen flows from the bottom of the bottom plate 11 to the accommodation space 13 of the lower carrier plate 1 through the first guide section 41, the second guide section 42 and the third guide section 43, thereby realizing the diversion of liquid nitrogen and rationally utilizing liquid nitrogen.

[0061] In order to ensure that the liquid nitrogen guided out by the third guide section 43 falls into the accommodating space 13 of the lower carrier plate 1 , optionally, the length of the third guide section 43 is greater than the length of the first guide section 41 .

[0062] like Figure 6 As shown, the coils 2 in the two adjacent layers of the carrier plates 1 are connected by connecting pipes 6, so that the coils 2 of multiple carrier plates 1 are connected to change the heat exchange capacity of the heat exchanger to meet different heat exchange requirements. According to different requirements, different numbers of carrier plates 1 (i.e., coils 2) are selected to achieve different heat exchange requirements.

[0063] Each carrier plate 1 (containing the coil 2) constitutes a heat exchange unit, and the liquid nitrogen spray rack 3 of each heat exchange unit has an independent liquid inlet solenoid valve 313, which can change the opening of each liquid inlet solenoid valve 313 according to the heat exchange conditions of the heat exchange unit to control the liquid nitrogen demand for heat exchange of the coil 2 of each carrier plate 1.

[0064] The working principle of the liquid nitrogen refrigeration heat exchanger 100 according to the embodiment of the present application is:

[0065] When the liquid nitrogen refrigeration heat exchanger 100 is working, the liquid inlet solenoid valve 313 is opened, and the liquid nitrogen is transported to the top of the corresponding coil 2 through the main delivery channel and the branch delivery channel, and sprayed to the coil 2 to perform heat exchange on the medium in the coil 2. As the spraying time increases, the ungasified liquid nitrogen accumulates in the storage space 13 of the carrier plate 1, and the coil 2 is immersed in the liquid nitrogen, and the liquid nitrogen is reused to improve the heat exchange efficiency. As the liquid level of the liquid nitrogen in the storage space 13 rises, the excess liquid nitrogen is diverted to the storage space 13 of the lower carrier plate 1 through the guide member 4, making full use of the liquid nitrogen, saving energy, and achieving rapid cooling.

[0066] In combination with the above working principle, according to the liquid nitrogen refrigeration heat exchanger 100 of the present application, through the cooperation of the supporting plate 1, the coil 2 and the liquid nitrogen spray rack 3, the liquid nitrogen is fully utilized to achieve energy saving and realize the effect of rapid cooling.

[0067] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0068] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid nitrogen refrigeration heat exchanger, characterized in that: It comprises a carrier plate, a coil and a liquid nitrogen spray rack; the carrier plate comprises a bottom plate and side plates formed around the bottom plate, the bottom plate and the side plates form a storage space for accommodating the coil, the coil is arranged on the bottom plate, the liquid nitrogen spray rack is used to spray liquid nitrogen toward the coil, and the carrier plate is used to carry liquid nitrogen so that the coil is immersed in liquid nitrogen; The bottom plate is provided with a filling compartment, and the filling compartment is used to cooperate with the coil and fill the accommodation space; The carrying plate is provided with a flow guide, one end of which is connected to the upper edge of the side plate and communicated with the accommodating space.

2. The liquid nitrogen refrigeration heat exchanger according to claim 1, characterized in that: The width of one end of the filling compartment away from the bottom plate is smaller than the width of one end of the filling compartment close to the bottom plate.

3. The liquid nitrogen refrigeration heat exchanger according to claim 1, characterized in that: The coil is an S-shaped structure, comprising a plurality of straight tubes, two adjacent straight tubes being arranged in parallel and connected by an elbow, the filling compartment being located between two adjacent straight tubes, and the two straight tubes located at both ends respectively passing through the side plates and extending out of the accommodation space.

4. The liquid nitrogen refrigeration heat exchanger according to claim 3, characterized in that: Solenoid valves are respectively arranged at both ends of the coil.

5. The liquid nitrogen refrigeration heat exchanger according to claim 3, characterized in that: The liquid nitrogen spray rack includes a main support and a sub-support, the main support is provided with a main conveying channel, one end of the main conveying channel is used to be connected to a liquid nitrogen source, the sub-support is provided with a plurality of sub-conveying channels connected to the main conveying channel, each sub-conveying channel is arranged corresponding to a straight pipe, each sub-conveying channel is provided with a plurality of nozzles, and the plurality of nozzles are distributed at intervals along the length direction of the straight pipe.

6. The liquid nitrogen refrigeration heat exchanger according to claim 1, characterized in that: The liquid nitrogen refrigeration heat exchanger also includes a frame, a plurality of the carrying plates are provided, and the plurality of the carrying plates are installed on the frame at intervals in the vertical direction. A guide member is provided on the carrying plate, one end of the guide member is connected to the upper edge of the side plate and communicated with the accommodating space, and the guide member is used to guide the liquid nitrogen on the upper carrying plate to the accommodating space of the lower carrying plate.

7. The liquid nitrogen refrigeration heat exchanger according to claim 6, characterized in that: The guide member includes a first guide section, a second guide section and a third guide section which are connected in sequence, the first guide section, the second guide section and the third guide section are all hollow structures, the first guide section is installed on the upper edge of the side plate and is connected to the accommodating space, the second guide section is vertically arranged with the first guide section, the third guide section is parallelly arranged with the first guide section, and the third guide section is located below the bottom plate and on the same side of the second guide section as the first guide section.

8. The liquid nitrogen refrigeration heat exchanger according to claim 6, characterized in that: The coils in the supporting plates of two adjacent layers are connected via connecting pipes.

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