JPH0538932U - 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 cooling liquid injection port 12 are arranged on an upper surface cover 13 at an upper portion of the cooling water tank 8, and the cooling liquid injection port 1
The cooling water 20 is filled in the position where 2 is the highest. [Effects] Under the above 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 utilizing 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 the figure, 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 parallel. 4 is a reflection tube arranged so as to wrap around the flash lamp 1 and the YAG rod 3. Reference numeral 5 is the flash lamp 1, YAG rod. 3, the reflecting cylinder 4 is assembled therein, and the cavity has a cavity cooling liquid inlet 6 and a cavity cooling liquid outlet 7. The cavity 8 is connected to the first pipe 9 on the side of the cavity cooling liquid outlet 7 and its lower part. In tank A liquid cooling liquid inlet 10, a cylindrical cooling water tank having a tank cooling liquid outlet 11 on the upper portion thereof, 12 is a cooling liquid injection port arranged in a top cover 13 of the cooling water tank 8, and 14 is a cooling water tank 8 of the cooling water tank 8. Plate-shaped heat radiation fins arranged around the cylindrical surface, 15 is a cooling fan arranged laterally of the cooling water tank 8, 16 is an air duct that encloses the cooling fan 15 and the plate-shaped heat radiation fins, and 17 is the cavity liquid. A pump arranged between the 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 third pipe connecting the cavity 5 and the pump 17. A pipe, 20 is cooling water which fills the entire cooling system and has 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 tanker 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 the bubbles are attached around the flash lamp 1, the YAG rod 3 and the reflecting tube 4, the transmittance of the laser light is lowered, and the light energy collected in the YAG rod 3 is reduced. Due to the adhesion, 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 higher than the tip of the tank cooling liquid outlet 11. 4A and 4B. For example, as shown in FIGS. 4 (a) and 4 (b), the air layer 21 keeps the tank cooling liquid even when the entire posture of the laser distance measuring device 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 return to the inside of the cavity 5 even if the posture changes, and there is no width. 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, cooling water is sent into the cavity while the air bubbles circulated by the pump are mixed, and the air bubbles adhere to the YAG rod or the like, resulting in a problem that the laser output is reduced.

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 bubbles are removed using a bellows and a cooling liquid injection port while driving a pump.

[0007]

[Action]

 In this invention, the bellows act to absorb the liquid expansion of the cooling water in the cooling device, and the cooling water is injected into the cooling device to collect the bubbles remaining in the cooling system in the progressive cooling tank. After that, the pressure difference and expansion and contraction of the bellows are used to remove 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 top cover 13.

In the cooling device of the laser oscillator configured as described above, first, the entire device is tilted as shown in FIG. 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. At this time, the pressure inside the second pipe 18 on the discharge side of the pump 17 and the inside of the cooling water tank 8 is high, so that the bellows 22 is also in a free height state. It is in a stretched state due to the higher internal pressure. When the cap of the cooling liquid inlet 12 is loosened in this state, the internal pressure is instantly released, the bellows 22 returns to the free height, and at the same time, the cooling liquid is instantaneously released from the cap portion of the cooling liquid inlet 12. The air collected near the inlet 12 is discharged. After this, the required cooling water 20 is replenished from the cooling liquid inlet 12, and this operation is repeated 2-3 times. As a result, the air layer in the device is completely removed. Also, after the inside of the cooling system is completely filled with the cooling water, the expanded portion of the cooling water is absorbed by the expansion of the bellows 22.

[0010]

[Effect of the device]

 As described above, this invention uses a bellows to create a cooling system that does not have an air layer inside the device by utilizing the pressure difference, so a reduction in laser output can be prevented and a stable laser ranging device with high output can be obtained. There is an effect that is.

[Brief description of drawings]

FIG. 1 is an overall configuration 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 pipe 19 Third pipe 20 Cooling water 21 Air layer 22 Bellows

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 cylinder arranged so as to wrap around the G rod, the flash lamp, the YAG rod, a cavity in which the reflector cylinder is assembled and 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, the tank cooling liquid inlet is at the lower part thereof, the tank cooling liquid outlet is at the upper part thereof, a cylindrical cooling water tank having a plate-shaped radiating fin around the cylindrical surface thereof, and an upper cover of the cooling water tank. A cooling liquid inlet, a bellows similarly arranged on the upper cover, a cooling fan arranged on the side of the cooling water tank, an air duct enclosing the cooling fan and the plate-shaped heat radiation fin portion, the cavity cooling liquid A pump arranged between the inlet and the tank coolant outlet, a second pipe connecting the cooling water tank and the pump, the cavity and the upper part. Third pipe connecting the pump, the cooling device of the laser oscillator, characterized in that it is constituted by the cooling water filled in the entire cooling system.