A heat-triggered chemical cold storage thermal runaway cooling device

Abstract

The present invention discloses a heat-triggered chemical cold storage thermal runaway cooling device. A spring presses against the upper end of a stopper, keeping the first protrusion of the stopper embedded in a retaining ring groove to limit shaft rotation. A bimetallic strip beneath the stopper tilts up when the temperature reaches a preset value, pushing the first protrusion of the stopper out of the corresponding groove. The preset value is 10 to 20°C below the thermal runaway temperature. A spring between the shaft and the barrel drives the shaft to rotate when the first protrusion of the stopper is pushed out of the corresponding groove. A blade mount is mounted on the upper end of the shaft, rotating with it. A blade is mounted on the bottom of the blade mount. As the blade mount rotates, the blade cuts through a polyethylene bag and stirs two powders, causing the two powders to react and release cold energy. This device has the advantages of generating no electromagnetic interference and high cooling efficiency, making it suitable for thermal runaway cooling of radars.

Description

Technical Field

[0001] The invention relates to a thermal runaway cooling device, in particular to a heat-triggered chemical cold storage thermal runaway cooling device. Background Art

[0002] Currently, radar is developing towards higher power and higher frequencies. The increasing heat flux density during operation poses a challenge to radar thermal management. If heat dissipation is not timely, heat concentration will occur, which can lead to equipment damage and even fire accidents in severe cases. Therefore, research on thermal runaway cooling of radar is essential.

[0003] Existing thermal runaway cooling devices primarily target batteries and are unsuitable for radars with high electromagnetic interference requirements. Specifically, battery thermal runaway cooling devices primarily include air cooling, liquid cooling, and phase change material cooling. Air and liquid cooling require motors and power supply components, which generate electromagnetic interference and their own heat, hindering radar heat dissipation. The phase change material in phase change material cooling devices also undergoes phase changes under normal operating conditions, consuming cooling energy. When a radar experiences thermal runaway, these cooling devices may not be able to provide sufficient cooling. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a heat-triggered chemical cold storage thermal runaway cooling device that does not generate electromagnetic interference and has high cooling efficiency to meet the thermal runaway cooling needs of radar.

[0005] Technical solution: A heat-triggered chemical cold storage thermal runaway cooling device of the present invention has a closed cavity in which a heat-triggered stirring mechanism is installed;

[0006] The heat-triggered stirring mechanism includes a cylinder with a fixed lower end, a shaft and a retaining ring inside the cylinder, wherein the shaft is axially limited by an axial limit support assembly fixed to the top of the cylinder, and the shaft and the axial limit support assembly are rotatably matched; the retaining ring is fixed;

[0007] A radial through groove and a first axial groove are provided at the bottom of the shaft body. The first axial groove is located above the radial through groove and is connected to the radial through groove. A spring is provided in the first axial groove, and a matching stopper is inserted in the radial through groove.

[0008] The retaining ring has a center hole, and a groove communicating with the center hole is formed on the top surface of the retaining ring. The upper side surface of the stopper has a first protrusion adapted to fit into the groove. The stopper and the shaft are inserted into the center hole of the retaining ring together. The spring presses on the upper end of the stopper, so that the first protrusion remains embedded in the corresponding groove, thereby limiting the rotation of the shaft.

[0009] A bimetallic strip is provided below the stopper. The bimetallic strip is capable of tilting when the temperature reaches a preset value, pushing the first protrusion of the stopper out of the corresponding groove. A power-storing spring is installed between the shaft and the cylinder. The spring is capable of driving the shaft to rotate when the first protrusion of the stopper is pushed out of the corresponding groove. The preset value is 10-20°C lower than the thermal runaway temperature.

[0010] Two kinds of powders capable of endothermic reaction are arranged at intervals along the circumference in the closed cavity, and the two powders are separated by a polyethylene bag; a blade mounting seat that rotates with the shaft is installed at the upper end of the shaft, and a blade is installed at the bottom of the blade mounting seat. When the blade mounting seat rotates, the blade can cut the polyethylene bag and stir the two powders, and the two powders react to release cold energy.

[0011] Furthermore, the closed cavity is formed by the shell and a top plate and a bottom plate respectively fixed on both sides of the shell, and the cylinder is fixed on the bottom plate.

[0012] Furthermore, an inner gear ring is installed at the bottom of the top plate, and an outer gear is installed on the top surface of the blade mounting seat, and the inner gear ring is meshed with the outer gear; an L-shaped connecting piece is fixed to the upper end of the shaft, and a bearing is fixed on the L-shaped connecting piece. The L-shaped connecting piece passes through the central through hole of the blade mounting seat, and the outer ring of the bearing is fixed to the external gear.

[0013] Furthermore, the shell is square, and the cylinder is located in the center of the bottom plate; the gear ratio of the outer gear and the inner gear ring is 3:4; the blade mounting seat is designed according to the Lerow triangle principle, so that the blades can fully rotate and stir in the square shell.

[0014] Furthermore, the embedding grooves on both sides of the top surface of the retaining ring are "right-angled trapezoidal structures", and the bottom sides of the "right-angled trapezoidal structures" are arc-shaped sides; the two embedding grooves are symmetrically arranged.

[0015] Furthermore, there is a circle of annular protrusions on the outside of the shaft body, and the axial limiting support assembly includes a first support ring and a second support ring, which are respectively sleeved on the shaft body, and the two support rings are fixedly connected; the opposite end faces of the two support rings are formed with a cavity for accommodating the annular protrusions; the upper support ring is fixedly connected to the cylinder.

[0016] Furthermore, a second axial groove is provided on the circumferential surface of the cylinder body for hanging the fixed end of the mainspring; the second axial groove extends to the top of the cylinder body.

[0017] Furthermore, there are multiple mainsprings, which are arranged at intervals along the axial direction of the cylinder.

[0018] Furthermore, the shaft body is formed by two half-shafts assembled by bolts, and the opposite end surfaces of the two half-shafts are formed with grooves for clamping and fixing the free end of the mainspring.

[0019] Furthermore, a platform is provided inside the cylinder below the retaining ring, and the platform and the cylinder jointly limit the axial position of the retaining ring; a second protrusion is provided on the outer edge of the upper surface of the platform, and a third protrusion is provided on the side of the retaining ring, and the second protrusion and the third protrusion are respectively plugged into and cooperated with the cylinder to limit the rotation of the platform and the retaining ring; the bimetallic strip is provided on the concave platform of the platform.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0021] This invention is a device similar to a "safety valve." Initially locked, it triggers at a specific temperature using a bimetallic strip, releasing the spring's elastic potential energy. This in turn stirs the two powders, achieving cooling through the endothermic reaction of chemical mixing. Before triggering, the two powders are kept out of contact, preventing loss of cooling energy. After triggering, the two powders are evenly mixed, releasing a significant amount of cooling energy. This achieves high cooling efficiency and effectively controls thermal runaway. This purely mechanical device, lacking a motor or power supply, generates no electromagnetic interference and is therefore suitable for radar thermal runaway cooling.

[0022] After refilling the powder and resetting the components, the device can be put back into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 2. It is a schematic structural diagram of a heat-triggered chemical cold storage thermal runaway cooling device provided by an embodiment of the present invention;

[0024] Figure 2 2 is a schematic structural diagram of a top plate according to an embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of a housing in an embodiment of the present invention;

[0026] Figure 4 2 is a schematic structural diagram of a heat-triggered stirring mechanism according to an embodiment of the present invention;

[0027] Figure 5 yes Figure 4 Bottom view of

[0028] Figure 6 This is a schematic diagram of the main structure of the heat-triggered stirring mechanism in an embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the coordination structure of the spring and the stopper in an embodiment of the present invention;

[0030] Figure 8 It is a cross-sectional view of the main structure of the heat-triggered stirring mechanism and the joint surface of the cylinder along the two half axes in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] Attachment Figures 1 to 8 The reference numerals in the figures are as follows:

[0033] 1. Top plate; 2. Shell; 3. Bottom plate; 4. Heat-triggered stirring mechanism; 41. Internal gear ring; 42. Cylinder; 43. Axial limit support assembly; 431. First support ring; 432. Second support ring; 44. Blade mounting seat; 45. External gear; 46. Shaft; 461. First half shaft; 462. Second half shaft; 47. Spring; 48. L-shaped connector; 49. Bearing; 410. Platform; 411. Retaining ring; 412. Stop block; 413. Spring; 414. Bimetallic strip.

[0034] like Figures 1 to 8 As shown, an embodiment of the present invention provides a heat-triggered chemical cold storage thermal runaway cooling device, comprising a top plate 1, a shell 2, a bottom plate 3, and a heat-triggered stirring mechanism 4. Shell 2 is square, with screw holes distributed on its top and bottom sides. Top plate 1 and bottom plate 3 are bolted to either side of shell 2, forming a closed cavity within which heat-triggered stirring mechanism 4 is installed.

[0035] The heat-triggered stirring mechanism 4 includes a cylinder 42, the lower end of which is fixed to the center of the base plate 3 by bolts, and the inside of the cylinder 42 is provided with a shaft 46, a platform 410, a retaining ring 411 and a stopper 412, wherein the platform 410, the retaining ring 411 and the stopper 412 are located below the shaft 46.

[0036] The shaft 46 is axially limited by the axial limit support assembly 43 fixed to the top of the cylinder 42. The shaft 46 and the axial limit support assembly 43 are rotatably coupled. Specifically, the shaft 46 has a ring of annular protrusions on the outside. The axial limit support assembly 43 includes a first support ring 431 and a second support ring 432. The first support ring 431 is on top and the second support ring 432 is on the bottom. The two support rings are respectively sleeved onto the shaft 46 and fixedly connected by bolts. The opposing end surfaces of the two support rings are formed with cavities to accommodate the annular protrusions, thereby achieving rotatable coupling between the shaft 46 and the two support rings. The first support ring 431 is fixedly connected to the cylinder 42 by bolts.

[0037] The bottom of the shaft 46 is defined by a radial through-slot and a first axial groove. The first axial groove is located above and connected to the radial through-slot. A spring 413 is positioned in the first axial groove, and a stopper 412 is adapted to fit within the radial through-slot. The retaining ring 411 has a central hole, and two sides of its top surface are provided with slots that connect to the central hole. The slots are rectangular trapezoidal in shape, with curved bottom edges (located on the side of the central hole), and the two slots are symmetrically arranged. The upper side of the stopper 412 has a first protrusion that fits within the slot. The stopper 412 and the shaft 46 are inserted into the central hole of the retaining ring 411 together. The spring 413 presses against the upper end of the stopper 412, keeping the first protrusion engaged in the corresponding slot, thereby limiting the rotation of the shaft 46.

[0038] The purpose of setting the groove into a "right-angled trapezoidal structure" is to ensure that the stopper 412 and the shaft 46 can subsequently rotate a full circle, preventing the first protrusion of the stopper 412 from falling into the groove of the retaining ring 411 after only half a circle. When the first protrusion is inserted into the corresponding groove, a certain height space is left between the top of the stopper 412 and the first axial groove, allowing the first protrusion to be ejected from the corresponding groove.

[0039] A power-storing spring 47 is installed between the shaft 46 and the barrel 42. To facilitate the installation of the spring 47, the shaft 46 is composed of a first half-shaft 461 and a second half-shaft 462 assembled by bolts. The opposite end faces of the two half-shafts are formed with grooves for clamping and fixing the free end of the spring 47. In this embodiment, there are two springs 47, which are arranged at intervals along the axial direction of the barrel 42. At least one second axial groove is provided on the circumferential surface of the barrel 42 for hanging the fixed end of the spring 47. The second axial groove extends to the top of the barrel 42. When the spring 47 is storing power, it only needs to be pre-tightened by one rotation. When it is fully released, it can drive the block 412 and the shaft 46 to rotate one circle.

[0040] The platform 410 is positioned below the retaining ring 411. Together, the platform 410 and the cylinder 42 limit the axial position of the retaining ring 411. A third protrusion is provided on the side of the retaining ring 411, which engages with the cylinder 42 to secure the retaining ring 411. A second protrusion is provided on the outer edge of the upper surface of the platform 410, which engages with the cylinder 42 to limit the rotation of the platform 410. A bimetallic strip 414 is provided on the concave portion of the platform 410, which contacts the lower surface of the stopper 412.

[0041] The bimetallic strip 414 can tilt when the temperature reaches a preset value, pushing the first protrusion of the stopper 412 out of the corresponding groove. The spring 47 can drive the shaft 46 to rotate when the first protrusion of the stopper 412 is pushed out of the corresponding groove. Assuming that the part to be cooled (such as a chip) reaches the thermal runaway temperature, severe and irreversible damage will occur. Due to the temperature difference between the part to be cooled and the bimetallic strip, the preset value is 10 to 20°C lower than the thermal runaway temperature. The tilting temperature of the bimetallic strip, that is, the preset value, depends on its design, process, and manufacturing. Existing technology can meet the needs of manufacturing bimetallic strips with different tilting temperatures. Therefore, the bimetallic strip 414 can be selected according to needs.

[0042] Two powders capable of undergoing endothermic reaction are arranged circumferentially in the closed cavity and separated by polyethylene bags. For example, one powder is placed in a polyethylene bag and the other powder is placed between two polyethylene bags.

[0043] At the same volume, the following four endothermic reactions between solid powders that can occur at room temperature are compared: the reaction between ammonium chloride and barium hydroxide, ammonium chloride and calcium hydroxide, ammonium sulfate and calcium hydroxide, and ammonium nitrate and barium hydroxide. Through the relevant calculations of chemical reaction equations, enthalpy change, molar mass, and density, it is concluded that the endothermic heat of these four reactions at equal volumes decreases in sequence. That is, at the same volume, ammonium chloride powder and barium hydroxide powder have the highest endothermic heat, and therefore are the two preferred powders of the present invention.

[0044] An L-shaped connector 48 is bolted to the upper end of the second half-shaft 462. A bearing 49 is secured to the L-shaped connector 48. Specifically, the L-shaped connector 48 is secured to the inner ring of the bearing. An inner ring gear 41 is bolted to the bottom of the top plate 1. An outer gear 45 is bolted to the top surface of the blade mount 44. The inner ring gear 41 meshes with the outer gear 45. The L-shaped connector 48 passes through the central through-hole of the blade mount 44. The outer ring of the bearing 49 is secured to the outer gear 45 (the outer gear 45 has a matching circular groove at the bottom). When the shaft 46 rotates, the L-shaped connector 48 rotates with it, driving the outer gear 45 and the blade mount 44 to rotate. This rotation is affected by the meshing of the outer gear 45 with the inner ring gear 41. The L-shaped connector 48 rotates in opposite directions to the outer gear 45.

[0045] A blade (not shown) is installed at the bottom of the blade mounting seat 44. The blade can cut the polyethylene bag and stir the two powders when the blade mounting seat 44 rotates, so that the two powders react and release cold energy.

[0046] Since the shell is square, in order to ensure that the blades can fully rotate and stir in the square shell (including the four corners), the following design is made.

[0047] The gear ratio of the outer gear 45 to the inner gear ring 41 is configured to be 3:4, and the blade mounting seat 44 is designed according to the Reuleaux triangle principle.

[0048] The heat-triggered stirring mechanism 4 is located in the center of the device as a whole, but the blade mounting seat 44, the external gear 45 and the bearing 49 are eccentrically arranged, and their distance from the center is determined by the L-shaped connecting piece 48, which is related to the size of the device.

[0049] The blade mounting seat 44 is designed according to the Reuleaux triangle principle. For example, if the gear module is 2 and the center distance between the outer gear 45 and the inner gear ring 41 is 8 mm, then the number of teeth of the outer gear 45 and the inner gear ring 41 is 24 and 32 respectively, with a tooth ratio of 3:4. Assume that the distances from the three vertices of the Reuleaux triangle to its geometric center point x are , then the distance between vertices is ,So , the size of the Reuleaux triangle can be obtained, and the size of the blade mounting seat 44 is approximately this.

[0050] The present invention does not impose any specific limitations on the specific arrangement of the blades. For example, three sets of blades can be installed at the bottom of the blade mount 44 at 120° intervals, with multiple blades in each set arranged along the triangle's apex to the center. The blades need to have both mixing and cutting capabilities, so sharp edges are required.

[0051] When the heat-triggered chemical cold storage thermal runaway cooling device is in use, the bottom plate 3 is in direct contact with the component to be cooled, that is, the cold energy is released outwards through the bottom plate 3. Thermal paste can be applied on the contact surface to enhance the heat conduction effect.

Claims

1. A heat-triggered chemical cold storage thermal runaway cooling device, characterized in that: It has a closed cavity, in which a heat-triggered stirring mechanism (4) is installed; The heat-triggered stirring mechanism (4) comprises a cylinder (42) fixed at the lower end, and a shaft (46) and a retaining ring (411) are provided inside the cylinder (42), wherein the shaft (46) is axially limited by an axial limit support assembly (43) fixed at the top of the cylinder (42), and the shaft (46) and the axial limit support assembly (43) are rotationally matched; the retaining ring (411) is fixedly provided; A radial through groove and a first axial groove are formed at the bottom of the shaft body (46), the first axial groove is located above the radial through groove and is connected to the radial through groove, a spring (413) is provided in the first axial groove, and a matching stopper (412) is inserted into the radial through groove; The retaining ring (411) has a center hole, and a groove communicating with the center hole is formed on the top surface of the retaining ring (411), and the upper side surface of the stopper (412) has a first protrusion adapted to the groove; the stopper (412) and the shaft (46) are inserted into the center hole of the retaining ring (411), and the spring (413) presses on the upper end of the stopper (412) so that the first protrusion remains embedded in the corresponding groove to limit the rotation of the shaft (46); A bimetallic strip (414) is provided below the stopper (412), and the bimetallic strip (414) can tilt up when the temperature reaches a preset value, thereby pushing the first protrusion of the stopper (412) out of the corresponding embedded groove; a power-storing spring (47) is installed between the shaft (46) and the cylinder (42), and the spring (47) can drive the shaft (46) to rotate when the first protrusion of the stopper (412) is pushed out of the corresponding embedded groove; the preset value is 10-20°C lower than the thermal runaway temperature; Two kinds of powders capable of undergoing an endothermic reaction are arranged at intervals along the circumference in the closed cavity, and the two powders are separated by a polyethylene bag; a blade mounting seat (44) that rotates with the shaft (46) is mounted on the upper end thereof, and a blade is mounted on the bottom of the blade mounting seat (44), and the blade can cut the polyethylene bag and stir the two powders when rotating with the blade mounting seat (44), so that the two powders react and release cold energy.

2. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 1 is characterized in that: The closed cavity is formed by enclosing a shell (2) and a top plate (1) and a bottom plate (3) respectively fixed on both sides of the shell (2), and the cylinder (42) is fixed on the bottom plate (3).

3. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 2, characterized in that: An inner gear ring (41) is installed at the bottom of the top plate (1), and an outer gear (45) is installed on the top surface of the blade mounting seat (44), and the inner gear ring (41) is meshed with the outer gear (45); an L-shaped connecting piece (48) is fixed to the upper end of the shaft body (46), and a bearing (49) is fixed on the L-shaped connecting piece (48), and the L-shaped connecting piece (48) passes through the central through hole of the blade mounting seat (44), and the outer ring of the bearing (49) is fixed to the outer gear (45).

4. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 3 is characterized in that: The shell (2) is square, and the cylinder (42) is located at the center of the bottom plate (3); the gear ratio of the outer gear (45) and the inner gear ring (41) is 3:4; the blade mounting seat (44) is designed according to the Leroy triangle principle, so that the blades can fully rotate and stir in the square shell.

5. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 1, characterized in that: The embedded grooves on both sides of the top surface of the retaining ring (411) are "right-angled trapezoidal structures", and the bottom side of the "right-angled trapezoidal structure" is an arc-shaped side; the two embedded grooves are symmetrically arranged.

6. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 1, characterized in that: The shaft body (46) has an annular protrusion on its outer side. The axial limit support assembly (43) includes a first support ring (431) and a second support ring (432). The first support ring (431) and the second support ring (432) are respectively sleeved on the shaft body (46), and the two support rings are fixedly connected. The opposite end surfaces of the two support rings are formed with a cavity for accommodating the annular protrusion. The upper support ring is fixedly connected to the cylinder body (42).

7. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 1, characterized in that: A second axial groove is provided on the circumferential surface of the barrel (42) for hooking the fixed end of the mainspring (47); the second axial groove extends to the top of the barrel (42).

8. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 7, characterized in that: There are multiple clockwork springs (47) which are arranged at intervals along the axial direction of the barrel (42).

9. The heat-triggered chemical cold storage thermal runaway cooling device according to any one of claims 1 to 8, characterized in that: The shaft body (46) is formed by splicing two half shafts together by bolts, and the opposite end faces of the two half shafts are formed with grooves for clamping and fixing the free end of the mainspring (47).

10. The heat-triggered chemical cold storage thermal runaway cooling device according to claim 1, characterized in that: A platform (410) is provided inside the cylinder (42) below the retaining ring (411), and the platform (410) and the cylinder (42) jointly limit the axial position of the retaining ring (411); a second protrusion is provided on the outer edge of the upper surface of the platform (410), and a third protrusion is provided on the side of the retaining ring (411); the second protrusion and the third protrusion are respectively plugged into and matched with the cylinder (42) to limit the rotation of the platform (410) and the retaining ring (411); and a bimetallic strip (414) is provided on the concave platform of the platform (410).

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