JPH0548368U - Laser oscillator cooling device - Google Patents

Abstract

(57) [Summary] [Object] To obtain a cooling device for a laser oscillator in which an air layer is not provided in the cooling system for the purpose of preventing a decrease in laser output due to residual bubbles in the cooling system. [Structure] A bellows 22 and a coolant inlet 12 are arranged on an upper surface cover 13 of an upper portion of a cooling water tank 8, and a bellows holder 23 arranged near the bellows 22 is used to form a bellows 2
The bellows spacer 24 is inserted while the central shaft 2 is pulled up. After that, the cooling water 20 is filled in such a manner that the cooling liquid inlet 12 is at the highest position. [Effects] In the above-described posture, air bubbles can be removed from the inside of the cooling system by collecting bubbles in the vicinity of the cooling liquid inlet and changing the internal volume of the cooling system using the elasticity of the bellows.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a cooling device using a liquid in a laser oscillator.

[0002]

[Prior Art]

 3 and 4 are views showing the structure of the conventional device, FIG. 3 is an overall configuration diagram of the conventional device, and FIG. 4 (a) shows the state of the cooling water in the cooling water tank when the posture of the conventional device changes by 90 °. Fig. 4 (b) is a diagram showing the state of the cooling water in the cooling water tank when the posture of the conventional device is changed by 45 °, in which 1 is a flash lamp connected to the high voltage circuit via electrodes 2. Reference numeral 3 is a YAG rod arranged in parallel with the flash lamp 1 in close proximity, 4 is a reflecting tube arranged so as to surround the flash lamp 1 and the YAG rod 3, and 5 is the flash lamp 1 and the YAG rod 3 , A cavity having a cavity cooling liquid inlet 6 and a cavity cooling liquid outlet 7 assembling the reflection cylinder 4 therein, and 8 is connected to the first pipe 9 on the side of the cavity cooling liquid outlet 7 and is provided at a lower portion thereof. Tank cold A cylindrical cooling water tank having a liquid inlet 10 and a tank cooling liquid outlet 11 on the upper portion thereof, 12 a cooling liquid pouring inlet arranged in an upper cover 13 of the cooling water tank 8, and 14 a cylinder of the cooling water tank 8. Plate-shaped radiating fins arranged around the surface, 15 is a cooling fan arranged laterally of the cooling water tank 8, 16 is an air duct that wraps the cooling fan 15 and the plate-shaped radiating fin 14, and 17 is the cavity A pump arranged between the liquid inlet 6 and the tank cooling liquid outlet 11, 18 is a second pipe connecting the cooling water tank 8 and the pump 17, and 19 is a connection between the cavity 5 and the pump 17. 3 is a third pipe, 20 is cooling water filled in the entire cooling system and having a water level in the middle of the tank cooling liquid outlet 11 and the upper cover 13, and 21 is an air layer in the cooling water tank 8.

The conventional cooling device for the laser oscillator is configured as described above, and first, the flash lamp 1 connected to the high voltage circuit emits light and collects on the YAG rod 3 via the reflecting cylinder 4. Be illuminated. In the YAG rod 3, when the condensed energy reaches a certain state, laser light is oscillated in a pulse form from the end surface of the YAG rod. The above is the basic operation of laser oscillation, and when laser oscillation is repeated, a large amount of heat is intensively generated inside the cavity 5, and it is necessary to form a heat dissipation system by liquid cooling directly from the heat generation density. In this structure, the heat from the flash lamp 1, the YAG rod 3, and the reflecting tube is carried out through the cavity cooling liquid inlet 6 by the cooling water 20 circulated by the pump 17, and the third pipe It reaches the inside of the cooling water tank 8 through 19, the pump 17, the second pipe 18, and the tank cooling liquid outlet 11. The arrow in the figure indicates the flow direction of the cooling water. A plate-shaped heat radiation fin 14 having a large heat radiation surface area is arranged around the cylindrical surface of the cooling water tank 8, and the heat from the cooling water 20 passes through the wall surface of the cooling water tank 8 to form the plate shape. The heat is conducted to the heat radiation fins 14 and is radiated to the outside by the cooling air sucked by the cooling fan 15. Here, the air duct 16 functions to efficiently apply the cooling air pushed by the cooling fan 15 to the plate-shaped heat radiation fins 14. The arrow in the figure indicates the direction of the cooling air. The cooling water 20 whose temperature has been lowered due to heat dissipation is cooled by being sent again from the tank cooling liquid inlet 10 through the first pipe 9 to the cavity cooling liquid outlet 7 into the cavity 5 again. Form a system. In addition, it is necessary to absorb the liquid expansion of the cooling water 20 in the present apparatus. Therefore, the cooling water tank 8 has a structure in which a certain amount of air layer 21 is secured. By the way, one of the causes of the decrease in the laser output efficiency of the laser oscillator is that the bubbles remain in the cavity 5. This is because when bubbles are attached around the flash lamp 1 and the YAG rod 3 reflecting cylinder 4, the transmittance of the laser light is reduced, the light energy collected in the YAG rod 3 is reduced, and the bubbles are not attached. As a result, the cooling efficiency of the YAG rod 3 itself lowers and the temperature rises, and the laser output lowers from the above two points. For this reason, it is important that the cooling system of the laser oscillator has a structure that prevents bubbles from entering the cavity. Also in this device, the water level of the cooling water 20 is above the tip of the tank cooling liquid outlet 11. As shown in FIGS. 4 (a) and 4 (b), for example, the air layer 21 keeps the tank cooling liquid even when the entire posture of the laser range finder changes and the angle of the cooling water tank changes. It is located above the tip of the outlet 11, and has a structure in which bubbles do not return to the inside of the cavity 5 even if the posture changes. An upper cover 13 is provided above the cooling water tank 8 and has a structure for injecting the cooling water 20 through a cooling liquid injection port provided therein.

[0004]

[Problems to be solved by the device]

 Since the conventional cooling device for the laser oscillator is configured as described above, the air inside the cooling tank can be changed when the posture of the entire laser distance measuring device changes suddenly or when it is mounted on the vehicle and vibration external force is applied. A state occurs in which the layer mixes in the cooling water for a moment. Therefore, the cooling water circulated by the pump is sent into the cavity while the cooling water is still mixed with the bubbles, and the bubbles adhere to the YAG rod, etc., resulting in a decrease in the laser output. was there.

The present invention has been made in order to solve such a problem, and proposes a cooling device for a laser oscillator that does not reduce the laser output.

[0006]

[Means for Solving the Problems]

 The cooling device for a laser oscillator according to the present invention has a structure in which a bellows is added to the upper part of a cooling water tank, and a structure for extending the bellows and a structure for removing bubbles by using a cooling liquid inlet.

[0007]

[Action]

 In this invention, the bellows act to absorb the liquid expansion of the cooling water in the cooling device, and when the cooling water is injected into the cooling device, the bubbles remaining in the cooling system are sequentially collected in the cooling tank. Then, use the expansion and contraction of the bellows to remove it from the coolant inlet.

[0008]

【Example】

 Example 1. 1 and 2 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram of the device, FIG. 2 is a diagram showing the time when an air layer is removed, and 1 to 21 are exactly the same as the above conventional device. It is a thing. 22 is a bellows arranged on the upper cover 13, 23 is a bellows holder having a hole for engaging the central shaft of the bellows 22 and a height dimension for limiting the expansion and contraction amount of the bellows, 24 is the bellows 22 and the bellows. It is a bellows spacer inserted between the holders 23.

In the cooling device for the laser oscillator configured as described above, first, as shown in FIG. 2, the bellows 22 and the bellows holder 23 are connected to the bellows holder 23 in a state where the tip of the central shaft of the bellows 22 is pulled up. Insert the spacer 24. At this time, the internal volume of the main unit has been increased by the expansion of the bellows. In addition, as shown in FIG. 2, the entire device is tilted. Then, after the cooling water 20 is injected into the apparatus from the cooling liquid injection port 12, the pump 17 is operated with the cap of the cooling liquid injection port 12 closed. Then, the bubbles remaining inside the cavity 5 in the device, the pump 17, the third pipe 19 and other parts of the device enter the cooling water tank 8 from the tank cooling liquid outlet 11 and As shown in FIG. 2, an air layer is collected near the cooling liquid inlet 12. The pump 17 is stopped when the bubbles in the apparatus are completely removed. When the bellows spacer 24 is pulled out after removing the cap of the cooling liquid injection port 12, the bellows 22 returns to the free height dimension. As a result, the internal volume of the device is reduced by the amount of contraction of the bellows, and the air layer gathered near the cooling liquid inlet 12 is discharged to the outside through the cooling liquid inlet 12 and the air of this device is discharged. The layer will be completely removed. The expanded portion of the cooling water in the device is absorbed by the expansion of the bellows 22.

[0010]

[Effect of the device]

 As described above, the present invention uses a bellows to form a cooling system that does not have an air layer in the device, so that there is an effect that a decrease in laser output can be prevented and a stable laser distance measuring device with high output can be obtained.

[Brief description of drawings]

FIG. 1 is an overall structural diagram of an apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the present invention when an air layer is removed.

FIG. 3 is an overall configuration diagram of a conventional device.

FIG. 4 is a diagram showing a state of cooling water when the posture of the conventional device is changed.

[Explanation of symbols]

 1 Flash Lamp 2 Electrode 3 YAG Rod 4 Reflecting Tube 5 Cavity 6 Cavity Liquid Inlet 7 Cavity Liquid Outlet 8 Cooling Water Tank 9 First Piping 10 Tank Liquid Inlet 11 Tank Liquid Outlet 12 Cooling Liquid Inlet 13 Top Cover 14 Plate-like Heat Dissipation Fins 15 Cooling fan 16 Air duct 17 Pump 18 Second piping 19 Third piping 20 Cooling water 21 Air layer 22 Bellows 23 Bellows holder 24 Bellows spacer

Claims (1)

[Scope of utility model registration request] 1. A flash lamp connected to a high-voltage circuit through an electrode, a YAG rod arranged in parallel near the flash lamp, the flash lamp and YA.
A reflector that is arranged so as to wrap around the G rod, the flash lamp, the YAG rod, a cavity in which the reflector is assembled and has a cavity cooling liquid outlet and a cavity cooling liquid inlet, and a cavity cooling liquid outlet side first cavity 1 is connected to the pipe, a tank cooling liquid inlet is provided at the lower part thereof, a tank cooling liquid outlet is provided at the upper part thereof, a cylindrical cooling water tank having a plate-shaped heat radiation fin around the cylindrical surface thereof, and a top cover of the cooling water tank is arranged. Liquid coolant inlet, a bellows similarly arranged on the surface cover, a hole engaging with the central shaft of the bellows, and a bellows holder having a height dimension for limiting the expansion and contraction amount of the bellows, the bellows and the bellows holder. Spacers for bellows to be inserted between the cooling water tank, the cooling fan arranged on the side of the cooling water tank, the cooling fan and the plate-like heat radiation fan. The connecting air duct surrounding the emission part, the cavity cooling liquid inlet and the tank coolant pump disposed between the outlet of the cooling water tank and the pump 2
2. A cooling device for a laser oscillator, comprising: the pipe, a third pipe connecting the cavity and the pump, and cooling water filled in the entire cooling system.