Thermal trigger chemical cold and heat storage out-of-control cooling device

Abstract

The invention discloses a thermal trigger chemical cold and heat storage out-of-control cooling device, which is characterized in that a spring is pressed at the upper end of a stop block, so that a first bulge of the stop block is kept in a state of being embedded into a caulking groove of a check ring to limit the rotation of a shaft body; the bimetallic strip below the stop block can be tilted up when the temperature reaches a preset value, and the first protrusion of the stop block is ejected out of the corresponding caulking groove. The preset value is 10-20 DEG C lower than the thermal runaway temperature; the clockwork spring between the shaft body and the barrel body can drive the shaft body to rotate when the first bulge of the stop block is ejected out of the corresponding caulking groove; a blade mounting seat rotating along with the shaft body is mounted at the upper end of the shaft body, blades are mounted at the bottom of the blade mounting seat, the blades can cut the polyethylene bag and stir two kinds of powder when rotating along with the blade mounting seat, and the two kinds of powder react to release cold energy. The device has the advantages of no electromagnetic interference and high cooling efficiency, and is suitable for thermal runaway cooling of the radar.

Description

Technical Field

[0001] The present invention relates to a thermal runaway cooling device, and more particularly to a thermally triggered chemical energy storage thermal runaway cooling device. Background Art

[0002] Currently, radars are developing towards higher power and higher frequency, and the heat flux density during their operation is continuously increasing, posing challenges to the thermal management of radars. If heat dissipation is not timely, heat concentration problems will occur, and in severe cases, equipment damage or even fire accidents may result. Therefore, it is very necessary to study the thermal runaway cooling of radars.

[0003] Existing thermal runaway cooling devices are mainly aimed at batteries and are not suitable for radars with high requirements for electromagnetic interference. Specifically, the thermal runaway cooling devices for batteries mainly include air-cooling devices, liquid-cooling devices, and phase change material cooling devices. Among them, air-cooling devices and liquid-cooling devices need to be equipped with motors and power supply components, which will generate electromagnetic interference. In addition, the motors and power supply components themselves will also generate heat, which is not conducive to the heat dissipation of radars. The phase change materials in the phase change material cooling devices will also undergo phase changes and consume cooling capacity under normal operating conditions. When a radar experiences thermal runaway, it may not be able to provide sufficient cooling capacity. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a thermally triggered chemical energy storage thermal runaway cooling device that does not generate electromagnetic interference and has high cooling efficiency to meet the thermal runaway cooling requirements of radars.

[0005] Technical Solution: A thermally triggered chemical energy storage thermal runaway cooling device of the present invention has a closed cavity, and a thermally triggered stirring mechanism is installed in the closed cavity; The thermally triggered stirring mechanism includes a cylinder body fixedly arranged at the lower end. The cylinder body has a shaft body and a retaining ring inside. The shaft body is axially limited by an axially limiting support assembly fixed to the top of the cylinder body, and at the same time, the shaft body is rotationally matched with the axially limiting support assembly; the retaining ring is fixedly arranged; A radial through groove and a first axial groove are formed at the bottom of the shaft body. The first axial groove is located above the radial through groove and is communicated with the radial through groove. A spring is arranged in the first axial groove, and a mating block is inserted into the radial through groove; The retaining ring has a central hole, and an insertion groove communicating with the central hole is formed on the top surface of the retaining ring. The upper side surface of the block has a first protrusion adapted to the insertion groove; the block and the shaft body are inserted into the central hole of the retaining ring together, and the spring presses on the upper end of the block to keep the first protrusion in the state of being embedded in the corresponding insertion groove to limit the rotation of the shaft body; A bimetal strip is arranged below the stopper. The bimetal strip can tilt up when the temperature reaches a preset value, and push out the first protrusion of the stopper from the corresponding groove; A wound spring for storing energy is installed between the shaft body and the cylinder body. The wound spring can drive the shaft body to rotate when the first protrusion of the stopper is pushed out from the corresponding groove; The preset value is 10 - 20 °C lower than the thermal runaway temperature; Two kinds of powders capable of undergoing endothermic reactions are arranged at intervals along the circumferential direction in the closed cavity. The two kinds of powders are separated by a polyethylene bag; A blade mounting seat that rotates with the shaft body is installed at the upper end of the shaft body. Blades are installed at the bottom of the blade mounting seat. The blades can cut the polyethylene bag and stir the two kinds of powders when rotating with the blade mounting seat, and the two kinds of powders react to release cold energy.

[0006] Further, the closed cavity is formed by enclosing a housing, a top plate and a bottom plate respectively fixed on both sides of the housing. The cylinder body is fixed on the bottom plate.

[0007] Further, an internal gear ring is installed at the bottom of the top plate, and an external gear is installed on the top surface of the blade mounting seat. The internal gear ring meshes with the external gear; An L-shaped connecting piece is fixed at the upper end of the shaft body, 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.

[0008] Further, the housing is square, and the cylinder body is located at the center of the bottom plate; The tooth ratio of the external gear to the internal gear ring is 3:4; The blade mounting seat is designed according to the Reuleaux triangle principle, so that the blades can fully rotate and stir in the square housing.

[0009] Further, the grooves on both sides of the top surface of the retaining ring are "right trapezoidal structures", and the bottom edge of the "right trapezoidal structure" is an arc edge; The two grooves are symmetrically arranged.

[0010] Further, a ring-shaped protrusion is provided on the outer side of the shaft body. The axial limit support assembly includes a first support ring and a second support ring. The first support ring and the second support ring are respectively sleeved on the shaft body, and the two support rings are fixedly connected; Cavities for accommodating the ring-shaped protrusion are formed on the opposite end faces of the two support rings; The upper support ring is fixedly connected to the cylinder body.

[0011] Further, a second axial groove is provided on the circumferential surface of the cylinder body for hanging the fixed end of the wound spring; The second axial groove extends to the top of the cylinder body.

[0012] Further, the number of wound springs is multiple, and they are arranged at intervals along the axial direction of the cylinder body.

[0013] Further, the shaft body is formed by splicing two half shafts with bolts. Grooves for clamping and fixing the free end of the wound spring are formed on the opposite end faces of the two half shafts.

[0014] Furthermore, a truncated cone is provided inside the cylinder body below the retaining ring. The truncated cone and the cylinder body jointly perform axial limiting on the retaining ring. An outer edge of the upper surface of the truncated cone is provided with a second protrusion, and a side surface of the retaining ring is provided with a third protrusion. The second protrusion and the third protrusion are respectively in plug-in fit with the cylinder body to limit the rotation of the truncated cone and the retaining ring. The bimetallic strip is arranged on the concave platform of the truncated cone.

[0015] Advantageous effects: Compared with the prior art, the present invention has the following remarkable advantages: The present invention is a device similar to a "safety valve". The device is initially locked and triggered by a bimetallic strip at a specific temperature, so that the spring releases elastic potential energy, and then stirs two powders, and uses the endothermic reaction when chemical substances are mixed to achieve the purpose of cooling. Before triggering, the two powders do not contact, avoiding the loss of cold quantity; after triggering, the two powders are stirred evenly, and a large amount of cold quantity can be released, with high cooling efficiency, and can achieve the purpose of effectively controlling thermal runaway. The device is a pure mechanical structure without a motor and power supply components, so it will not generate electromagnetic interference and is suitable for the thermal runaway cooling of radar.

[0016] After reloading the powder and resetting each component, the device can be put into use again. Description of the drawings

[0017] Figure 1 is a schematic structural diagram of a thermally triggered chemical energy storage and thermal runaway cooling device provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of the top plate in an embodiment of the present invention; Figure 3 is a schematic structural diagram of the housing in an embodiment of the present invention; Figure 4 is a schematic structural diagram of a thermally triggered stirring mechanism in an embodiment of the present invention; Figure 5 is Figure 4 a bottom view of; Figure 6 is a schematic diagram of the main structure of a thermally triggered stirring mechanism in an embodiment of the present invention; Figure 7 is a schematic diagram of the cooperation structure of a spring and a stopper in an embodiment of the present invention; Figure 8 is a sectional view of the main structure of a thermally triggered stirring mechanism and the cylinder body along the joint surface of two semi-axes in an embodiment of the present invention. Detailed implementation manners

[0018] The present invention will be further described below with reference to the drawings.

[0019] The Figures 1 to 8 reference numerals in the drawings are as follows: 1, top plate; 2, housing; 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 body; 461, first half shaft; 462, second half shaft; 47, spring; 48, L-shaped connecting piece; 49, bearing; 410, frustum; 411, retaining ring; 412, stop block; 413, spring; 414, bimetallic strip.

[0020] As Figures 1 to 8 shown, an embodiment of the present invention provides a heat-triggered chemical energy storage cold runaway cooling device, including a top plate 1, a housing 2, a bottom plate 3 and a heat-triggered stirring mechanism 4. The housing 2 is square, and screw holes are distributed on the upper and lower sides. The top plate 1 and the bottom plate 3 are respectively fixed to both sides of the housing 2 by bolts, thereby enclosing a closed cavity, and the heat-triggered stirring mechanism 4 is installed in this closed cavity.

[0021] The heat-triggered stirring mechanism 4 includes a cylinder 42, and the lower end of the cylinder 42 is fixed to the center position of the bottom plate 3 by bolts. An inner shaft 46, a frustum 410, a retaining ring 411 and a stop block 412 are arranged inside the cylinder 42, and the frustum 410, the retaining ring 411 and the stop block 412 are located below the shaft body 46.

[0022] The shaft body 46 is axially limited by an axial limit support assembly 43 fixed to the top of the cylinder 42, and at the same time, the shaft body 46 is rotationally matched with the axial limit support assembly 43. Specifically, there is a ring-shaped protrusion on the outside of the shaft body 46. 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 the top and the second support ring 432 is on the bottom. The two support rings are respectively sleeved on the shaft body 46, and the two support rings are fixedly connected by bolts. A cavity for accommodating the ring-shaped protrusion is formed on the opposite end faces of the two support rings, thereby realizing the rotational cooperation between the shaft body 46 and the two support rings. The first support ring 431 is fixedly connected to the cylinder 42 by bolts.

[0023] A radial through groove and a first axial groove are provided 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 arranged in the first axial groove. The stop block 412 is adapted to the radial through groove and is inserted into the radial through groove. The retaining ring 411 has a central hole, and chamfered grooves communicating with the central hole are provided on both sides of the top surface of the retaining ring 411. The chamfered grooves are "right-angled trapezoidal structures", and the bottom edge of the "right-angled trapezoidal structure" is an arc edge (located on the side of the central hole), and the two chamfered grooves are symmetrically arranged. The upper side of the stop block 412 has a first protrusion adapted to the chamfered groove. The stop block 412 and the shaft body 46 are inserted into the central hole of the retaining ring 411 together, and the spring 413 presses on the upper end of the stop block 412 to keep the first protrusion embedded in the corresponding chamfered groove, so as to limit the rotation of the shaft body 46.

[0024] The purpose of setting the embedding groove as a "right-angle trapezoidal structure" is to ensure that the subsequent stopper 412 and the shaft body 46 can rotate a full circle, and prevent the first protrusion of the stopper 412 from rotating half a circle and falling into the embedding groove of the retaining ring 411. When the first protrusion is embedded in the corresponding embedding groove, there is a certain height space between the top of the stopper 412 and the first axial groove, which allows the subsequent first protrusion to be ejected from the corresponding embedding groove.

[0025] A power-storing spring 47 is installed between the shaft body 46 and the cylinder body 42. In order to facilitate the installation of the spring 47, the shaft body 46 is composed of a first half shaft 461 and a second half shaft 462 assembled 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 spring 47. In this embodiment, there are two springs 47, which are arranged axially at intervals along the cylinder body 42. At least one second axial groove is provided on the circumferential surface of the cylinder body 42 for hanging the fixed end of the spring 47, and the second axial groove extends to the top of the cylinder body 42. When the spring 47 is storing power, it only needs to be pre-tightened by rotating it one circle. When it is fully released, it can drive the block 412 and the shaft body 46 to rotate one circle.

[0026] The platform 410 is arranged below the retaining ring 411, and the platform 410 and the cylinder 42 jointly limit the axial position of the retaining ring 411. A third protrusion is arranged on the side of the retaining ring 411, and the third protrusion is plugged into the cylinder 42 to fix the retaining ring 411. A second protrusion is arranged on the outer edge of the upper surface of the platform 410, and the second protrusion is plugged into the cylinder 42 to limit the rotation of the platform 410. A bimetallic strip 414 is arranged on the concave platform of the platform 410, and the bimetallic strip 414 contacts the lower surface of the stopper 412.

[0027] The bimetallic strip 414 can tilt up when the temperature reaches a preset value, and push the first protrusion of the block 412 out of the corresponding groove. The spring 47 can drive the shaft 46 to rotate when the first protrusion of the block 412 is pushed out of the corresponding groove. Assuming that the part to be cooled (such as a chip) reaches the thermal runaway temperature, serious and irreversible damage will occur. Since there is a temperature difference between the part to be cooled and the bimetallic strip, the preset value is 10~20℃ 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. The existing technology can meet the production of bimetallic strips with different tilting temperatures. Therefore, the bimetallic strip 414 can be selected according to needs.

[0028] Two powders capable of undergoing endothermic reaction are arranged at intervals along the circumferential direction in the closed cavity, and the two powders are separated by polyethylene bags, for example, one of the powders is placed in a polyethylene bag, and the other powder is placed between two polyethylene bags.

[0029] Under the same volume, compare the endothermic reactions among the following four solid powders that can occur at room temperature, namely, the reactions of ammonium chloride with barium hydroxide, ammonium chloride with calcium hydroxide, ammonium sulfate with calcium hydroxide, and ammonium nitrate with barium hydroxide. Through relevant calculations of chemical reaction equations, enthalpy changes, molar masses, and densities, it is obtained that the heat absorption of these four reactions decreases in sequence under equal volume, that is, the heat absorption of ammonium chloride powder and barium hydroxide powder is the highest under the same volume. Therefore, these two powders are preferred in the present invention.

[0030] A L-shaped connecting piece 48 is fixed to the upper end of the second half shaft 462 through bolts, and a bearing 49 is fixed on the L-shaped connecting piece 48. Specifically, the L-shaped connecting piece 48 is fixed to the inner ring of the bearing. The inner gear ring 41 is installed at the bottom of the top plate 1 through bolts, and the outer gear 45 is installed on the top surface of the blade mounting seat 44 through bolts. The inner gear ring 41 meshes with the outer gear 45. 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 (the bottom of the outer gear 45 has a suitable circular groove). When the shaft body 46 rotates, the L-shaped connecting piece 48 rotates accordingly and drives the outer gear 45 and the blade mounting seat 44 to rotate. The rotation is affected by the meshing of the outer gear 45 and the inner gear ring 41, and the rotation directions of the L-shaped connecting piece 48 and the outer gear 45 are opposite.

[0031] Blades (not shown in the figure) are installed at the bottom of the blade mounting seat 44. When the blades rotate with the blade mounting seat 44, they can cut the polyethylene bag and stir the two powders, so that the two powders react to release cold.

[0032] Since the housing is square, in order to enable the blades to rotate and stir fully in the square housing (including the positions of the four corners), the following design is carried out.

[0033] The tooth number ratio of the outer gear 45 to the inner gear ring 41 is configured as 3:4, and the blade mounting seat 44 is designed according to the Reuleaux triangle principle.

[0034] The thermal trigger stirring mechanism 4 is located entirely at the center of the device, but components such as the blade mounting seat 44, the outer gear 45, and the bearing 49 are eccentrically arranged, and their distances from the center are determined by the L-shaped connecting piece 48. This distance is related to the size of the device.

[0035] The blade mounting seat 44 is designed according to the Reuleaux triangle principle. For example, if the gear module is taken as 2 and the center distance between the outer gear 45 and the inner gear ring 41 is 8 mm, then under the requirement that the tooth number ratio of the outer gear 45 to the inner gear ring 41 is 3:4, the tooth numbers of the two are 24 and 32 respectively. Let the distance from the three vertices of the Reuleaux triangle to its geometric center point x be , then the distance between the vertices is , then , and the size of the Reuleaux triangle can be obtained. The size of the blade mounting seat 44 is approximately the same as this.

[0036] Regarding the specific setting of the blades, the present invention does not make specific limitations. For example, three groups of blades can be installed at the bottom of the blade mounting seat 44 at an interval of 120°, and each group of blades is arranged at intervals along the triangle vertex to the center as multiple. While the blades have the ability to mix, they also need specific cutting ability, so the edges of the blades need to be sharper.

[0037] When the thermal-triggered chemical energy storage and 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 quantity is released outward through the bottom plate 3. Thermal paste can be applied on the contact surface to enhance the heat conduction effect.

Claims

1. A thermal-triggered chemical energy storage and 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) fixedly arranged at the lower end, and a shaft (46) and a retaining ring (411) are arranged 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 arranged; 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 disposed 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 a first protrusion adapted to the groove is formed on the upper side surface of the stopper (412); the stopper (412) and the shaft (46) are inserted into the center hole of the retaining ring (411), and the spring (413) is pressed on the upper end of the stopper (412) so that the first protrusion remains embedded in the corresponding groove, thereby limiting 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 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 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 circumferential direction in the closed cavity, and the two kinds of powders are separated by a polyethylene bag; a blade mounting seat (44) that rotates with the shaft (46) is mounted on the upper end of the shaft (46), 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 kinds of powders when rotating with the blade mounting seat (44), so that the two kinds of powders react to release cold energy.

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

3. The thermal-triggered chemical energy storage and 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), 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), a bearing (49) is fixed on the L-shaped connecting piece (48), 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 thermal-triggered chemical energy storage cold runaway cooling device according to claim 3, 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 thermal-triggered chemical energy storage cold runaway cooling device according to claim 1, wherein, The chamfered grooves on both sides of the top surface of the retaining ring (411) are of "right trapezoidal structure", and the bottom side of the "right trapezoidal structure" is an arc edge; the two chamfered grooves are symmetrically arranged.

6. The thermal-triggered chemical energy storage and thermal runaway cooling device according to claim 1, wherein The outer side of the shaft body (46) has a ring-shaped protrusion. 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 faces of the two support rings form a cavity for accommodating the ring-shaped protrusion; the upper support ring is fixedly connected to the cylinder body (42).

7. The thermal-triggered chemical energy storage and thermal runaway cooling device according to claim 1, wherein The circumferential surface of the cylinder body (42) is provided with a second axial groove for hanging the fixed end of the spring (47); the second axial groove extends to the top of the cylinder body (42).

8. The thermal-triggered chemical energy storage cold runaway cooling device according to claim 7, wherein, The number of the springs (47) is multiple, and they are arranged at intervals along the axial direction of the cylinder body (42).

9. The thermal-triggered chemical energy storage and 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 with bolts, and the opposite end faces of the two half shafts form grooves for clamping and fixing the free end of the spring (47).

10. The thermal-triggered chemical energy storage and thermal runaway cooling device according to claim 1, wherein A platform (410) is arranged below the retaining ring (411) inside the cylinder body (42). The platform (410) and the cylinder body (42) jointly perform axial limit on the retaining ring (411); a second protrusion is arranged on the outer edge of the upper surface of the platform (410), and a third protrusion is arranged on the side surface of the retaining ring (411). The second protrusion and the third protrusion are respectively inserted and matched with the cylinder body (42) to limit the rotation of the platform (410) and the retaining ring (411); the bimetallic sheet (414) is arranged on the concave platform of the platform (410).

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