Small hot knife

Abstract

A small heat knife relates to the technical field of spacecraft solar cell array unlocking control and comprises a locking rope used for locking a cell array of an aircraft and comprising a heat insulation seat, a heat knife body and a wire. The heat insulation seat is fixedly connected to the working surface; the heat knife is arranged in the heat insulation seat; the locking rope is wound on the heat insulation seat; one end of the wire is connected in the hot knife and the other end is connected to the power supply end; the heat knife comprises a heating insulating rod, a heating wire and a heat conduction shell. The heat conduction shell is arranged in the heat insulation seat; the heating insulating rod is arranged in the heat conduction shell; the heating wire is wound outside the heating insulating rod; the heating wire is connected to the wire. Under specific index requirements, the technical requirements of smaller size and lighter weight can be met through simpler structural design. Therefore, the technical requirement of the equal-light-weight heat knife is met.

Description

Technical Field

[0001] The utility model relates to the technical field of unlocking control of a spacecraft solar cell array, in particular to a small hot knife. Background Art

[0002] After a spacecraft is launched into orbit, the solar array is the main energy source for the spacecraft, and its performance directly affects the reliability of the spacecraft's long-term flight in orbit. The solar array needs to be locked in the stowed state during the launch phase, and then unlocked and deployed after the spacecraft enters orbit and completes the corresponding tests.

[0003] There are many ways to unlock the solar array on a spacecraft, and hot knife unlocking is one of them. Hot knife unlocking is to heat and cut the locking device through a heating and cutting device (hot knife), so that the locking device loses its locking function, thereby unlocking the solar array. The Chinese patent with publication number CN113071719B discloses a double hot knife type clamping release mechanism, which completes the unlocking by heating and cutting the rope by two hot knife assemblies in succession. Because it adopts a double hot knife structure, its structure is relatively complex, but for the aerospace field, the unlocking device should ensure its lightweight while ensuring reliability. Summary of the invention

[0004] The utility model provides a small hot knife, the purpose of which is to further reduce the mass of a spacecraft unlocking device, thereby reducing the overall mass of the spacecraft.

[0005] The utility model provides a small hot knife, comprising a locking rope for locking a solar panel of an aircraft, and also comprising a heat insulation seat, a hot knife and a wire; the heat insulation seat is fixedly connected to a base; the hot knife is arranged in the heat insulation seat; the locking rope is wound around the heat insulation seat; one end of the wire is connected to the inside of the hot knife (2), and the other end is connected to a power supply end.

[0006] Furthermore, the hot knife includes a heating insulating rod, a heating wire and a heat-conducting shell; the heat-conducting shell is arranged on the upper part of the heat-insulating seat and is fixedly connected to the heat-insulating seat; the heating insulating rod is arranged in the heat-conducting shell; the heating wire is wound around the outside of the heating insulating rod; and the heating wire is connected to the wire.

[0007] Furthermore, the heat-conducting shell is a blind hole cylinder.

[0008] Furthermore, an insulating filler is filled between the heat-conducting shell and the insulating heating rod.

[0009] Furthermore, the insulating filler is sealed and filled in the heat-conducting housing.

[0010] Furthermore, the heat insulation seat is provided with two limiting rings; the hot knife is inserted into the limiting rings.

[0011] Furthermore, the thermal conductivity of the thermal insulation seat is less than 20 W / m·K.

[0012] Beneficial effects of the present invention:

[0013] The utility model provides a small hot knife which, under specific index requirements, heats the heating wire only by connecting the wire to the resistor. Such a structure is simple enough, does not require cutting, and does not require moving, and can achieve the technical requirements of smaller size and lighter weight.

[0014] The utility model provides a small hot knife, which plays the role of placing the hot knife through a heat insulation seat and bearing the pre-tightening force of a locking rope; the heat insulation seat is made of a poor thermal conductor, which conducts heat to a substrate at a low temperature and reduces the thermal impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a small hot knife described in the utility model;

[0016] Figure 2 It is a cross-sectional view of a small hot knife described in the utility model;

[0017] Among them: 1-insulation seat, 11-limiting ring, 2-hot knife, 21-heat conductive shell, 22-insulation heating rod, 23-heating wire, 24-insulation filler, 3-conducting wire. DETAILED DESCRIPTION

[0018] The utility model provides a small hot knife, comprising a heat insulation seat 1, a hot knife 2 and a wire 3; the heat insulation seat 1 is welded on a working surface; the working surface is a spacecraft substrate; a fixed position is first selected according to actual use. The heat-insulating seat 1 includes two limiting rings 11 and a base; the base is fixedly connected to the working surface; the limiting ring 11 is fixedly connected to the upper surface of the base; the hot knife 2 includes a heat-conducting shell 21, an insulating heating rod 22, a heating wire 23, and an insulating filler 24; the heat-conducting shell 21 is fixedly connected to the limiting ring 11; the heating insulating rod 22 is arranged inside the heat-conducting shell 21; the heat-conducting shell 21 is a round barrel with one end closed; the heating wire 23 is wound around the outside of the heating insulating rod 22, and the heating wire 23 is connected to the wire 3; the insulating filler 24 is filled between the heat-conducting shell 21 and the insulating heating rod 22 in a sealed manner; the insulating filler 24 is solidified after the heat-conducting shell 21 is shrunk; the insulating filler is an insulating heat-conducting material, and the utility model uses magnesium oxide filler; the wire 3 passes through the solidified insulating filler 24 and is connected to the heating wire 23; the end of the wire 24 facing away from the heating wire is the power supply end; the locking rope is wound around the outside of the heat-conducting shell 21. The diameter of the hot knife is 3mm-6mm, and the length is 8mm-14mm. While meeting the technical requirement of lighter weight, it can also bear the tension of the locking rope wrapped around the hot knife.

[0019] Working process of this utility model:

[0020] When the wire 3 is energized, the heating wire 23 is heated, and the heating wire 23 conducts heat to the surface of the thermally conductive shell 21 through the insulating filler with good thermal conductivity. When the surface temperature of the thermally conductive shell 21 reaches the melting point of the locking rope, the locking rope begins to melt. As the surface temperature of the thermally conductive shell 21 continues to rise and reaches a relatively constant temperature, the locking rope will be melted in a short time, and the battery pack connected to the locking rope will be unlocked.

Claims

1. A small hot knife, including a locking rope, for locking a solar panel of an aircraft, characterized in that: It also comprises a heat insulation seat (1), a hot knife (2) and a wire (3); the heat insulation seat (1) is fixedly connected to the base; the hot knife (2) is arranged in the heat insulation seat (1); the locking rope is wound around the heat insulation seat (1); one end of the wire (3) is connected to the hot knife (2), and the other end is connected to the power supply end.

2. A small hot knife according to claim 1, characterized in that: The hot knife (2) comprises an insulating heating rod (22), a heating wire (23) and a heat-conducting outer shell (21); the heat-conducting outer shell (21) is arranged on the upper part of the heat-insulating seat (1) and is fixedly connected to the heat-insulating seat (1); the insulating heating rod (22) is arranged in the heat-conducting outer shell (21); the heating wire (23) is wound around the outside of the insulating heating rod (22); and the heating wire (23) is connected to a wire (3).

3. A small hot knife according to claim 2, characterized in that: The heat-conducting outer shell (21) is a blind-hole cylinder.

4. A small hot knife according to claim 2, characterized in that: An insulating filler (24) is filled between the heat-conducting housing (21) and the insulating heating rod (22).

5. A small hot knife according to claim 4, characterized in that: The insulating filler (24) is sealed and filled in the heat-conducting outer shell (21).

6. A small hot knife according to claim 1, characterized in that: The heat insulation seat (1) is provided with two limiting rings (11); the hot knife (2) is inserted into the limiting rings (11).

7. A small hot knife according to claim 1, characterized in that: The thermal conductivity of the thermal insulation seat (1) is less than 20 W / m·K.

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