Pressure balancing device for liquid-cooled sheet-shaped amplification module and regulation and control method

Abstract

The invention relates to a system consisting of two reservoirs with cuboid structures, a water pump integrated with a temperature control function and a plurality of pipelines. A height-adjustable cylindrical overflow pipeline is arranged in the center of the bottom face of the reservoir, a water inlet and a water pipe channel are arranged at the position, close to the bottom, of the side face of the reservoir, and different calibers can be switched to meet different flow speed adjusting requirements. And the water pipe channel of the upstream reservoir is connected with a water pump integrated with temperature control, and is connected with the downstream reservoir after passing through the cooling module. The device has the technical effects that in the operation process, the liquid level height is controlled by adjusting the overflow pipelines of the upstream and downstream reservoirs, so that the liquid flow rate during operation of the device is determined. And the pressure intensity at the module can be influenced by adjusting the liquid level height difference. According to the Bernoulli principle, it is ensured that the static pressure and the flow speed at the modules can be independently adjusted.

Description

Technical Field The present invention relates to the technical field of liquid pressure and flow rate control in laser amplifiers, and more specifically to a pressure balancing device and control method for a liquid-cooled sheet-shaped amplifier module. The device utilizes the Bernoulli principle and fluid mechanics to independently control the flow rate and pressure of the cooling liquid, thereby resolving the problem of porthole deformation caused by liquid cooling in laser amplifiers. Background Art In the field of laser amplifiers, neodymium glass sheet amplifier modules (such as Figure 1 The liquid cooling system (shown in Figure 1) is a common component that generates a lot of heat during operation and needs to be dissipated through a liquid cooling system. However, existing liquid cooling systems have the following problems: The laser module's porthole, which connects the air and liquid media, is subject to different pressures (atmospheric pressure and hydraulic pressure) on both sides, causing the porthole to deform. The deformed porthole acts like a lens, focusing the incident light spot and exacerbating the wavefront distortion of the light spot. Increasing the liquid flow rate can improve heat dissipation efficiency, but it will further exacerbate the porthole's deformation effect. While reducing the flow rate can reduce deformation, it may lead to insufficient heat dissipation, affecting the normal operation of the laser module. Therefore, how to balance the pressure on both sides of the porthole while maintaining the flow rate to meet the heat dissipation requirements has become a technical challenge that needs to be solved urgently. Traditional liquid cooling systems typically cannot independently adjust flow rate and pressure, making it difficult to balance heat dissipation efficiency and optical performance in practical applications. Furthermore, existing devices often lack flexible adjustment mechanisms, making them unable to adapt to the needs of different working scenarios. Summary of the Invention To address these issues, the present invention proposes a pressure balancing device for a liquid-cooled, sheet-shaped amplifier module. This device aims to balance the pressure of the liquid during flow with atmospheric pressure without changing the flow rate. By designing an adjustable overflow pipe and reservoir system, and incorporating the Bernoulli principle, this device achieves adjustable liquid pressure without changing the flow rate. This effectively addresses the issue of light spot distortion caused by porthole deformation while ensuring efficient heat dissipation. The technical solutions of the present invention are as follows: A pressure balancing device for a liquid-cooled sheet-shaped amplifying module is characterized by comprising: The inlet and outlet reservoirs are both rectangular structures with the tops open to the atmosphere; a first overflow pipe provided at the bottom of the inlet reservoir and a second overflow pipe provided at the bottom of the outlet reservoir; a laser cooling module connected to the inlet reservoir and the outlet reservoir, and forming a coolant flow path through the first main cooling pipe and the second main cooling pipe; a water pump equipped with a temperature control function, supplying liquid to the inlet reservoir through a water inlet pipe and realizing closed-loop circulation through a first overflow recovery pipe and a second overflow recovery pipe; Wherein, by adjusting the heights of the first overflow pipe and the second overflow pipe, the liquid pressure and flow rate at the laser cooling module are independently controlled. Furthermore, the first overflow pipe and the second overflow pipe are detachable structures, and the liquid level height can be adjusted in a step-by-step manner by replacing components of different lengths. Furthermore, at least one water inlet and two water outlets are provided on the side of the inlet reservoir near the bottom, which are connected to the water pump and the laser cooling module respectively; A water inlet and a water outlet are provided on the side of the outlet reservoir near the bottom, which are connected to the laser cooling module and the water pump respectively. Furthermore, the inner diameter of the water inlet pipe is 6-10 mm, the inner diameter of the first main cooling pipe and the second main cooling pipe is 35-45 mm, and the inner diameter of the first overflow recovery pipe and the second overflow recovery pipe is 10-15 mm to constitute an inner diameter graded design of the pipe system. Furthermore, the water pump has a flow feedback function, which adjusts the output power in real time to maintain flow rate stability with an error range of ±0.1L / min. Furthermore, the material of the inlet reservoir and the outlet reservoir is stainless steel or polytetrafluoroethylene (PTFE), and the pipe material is polyvinyl chloride (PVC) or fluoroplastic. The inlet reservoir and the outlet reservoir both have a rectangular structure, and are provided with an opening connected to the atmosphere on the top. The inlet reservoir is equipped with a water inlet and two water outlets, with an overflow pipe arranged therebetween. The height can be controlled by disassembling and replacing pipes of different lengths to achieve precise control of the liquid level in the inlet reservoir. Similarly, the outlet reservoir is also equipped with a detachable overflow pipe to regulate the height of the liquid level in the reservoir. The construction material of the reservoir needs to be selected according to the properties of the coolant to ensure that the material is neither easily deformed nor chemically reacts with the coolant. In Example 1, the coolant is water, so the material of the reservoir is stainless steel. The liquid flow power source in the present invention is the aforementioned water pump. In Specific Example 1, a CWUP-20 water pump with pumping and temperature control functions is used. It should be noted that the power of the water pump will affect whether the present invention can achieve the predetermined upper limit of the water flow rate. In fact, the present invention is not limited to a specific model of water pump; any water pump with pumping and temperature control functions can serve as the driving device of the present invention.

[0001] The core connection assembly of the present invention primarily consists of pipes. The pipe material must be chemically non-reactive with the coolant. In Example 1, the pipe material used was polyvinyl chloride (PVC). It should be noted that the inner diameter of the pipe has a crucial influence on the maximum flow rate achieved by the device. Increasing the inner diameter of the pipe increases the flow rate until it approaches the maximum flow rate threshold that the hydraulic machinery can provide.

[0002] In the present invention, coolant flows from the water generator through an inlet pipe into the inlet reservoir. Liquid in the reservoir flows through the cooling module via a water pipe and then into the outlet reservoir. Water flowing beyond the first overflow pipe is recovered to the water generator via a first overflow recovery pipe. Water in the outlet reservoir is recovered to the water generator via a second overflow pipe and a second overflow recovery pipe.

[0003] The working mechanism of the present invention is constructed based on the Bernoulli principle and the Darcy-Weisbach friction formula.

[0004] By adjusting the height of the overflow pipe (or the height of the inlet reservoir as a whole) relative to the overflow pipe and the center height of the cooling module, the liquid flow rate and water pressure at the cooling module can be adjusted. Assume that the height of the inlet reservoir liquid level relative to the ground is h1, the water flow rate is v1, the pressure is p1, and the height of the cooling module center relative to the ground is h 2， The water flow velocity is v2, the pressure is p2, the outlet reservoir is at a height of h3 relative to the ground, the water flow velocity is v3, and the pressure is p3. Note that since there are holes above both the inlet and outlet reservoirs, we have: p1=p3=p0 (local standard atmospheric pressure) According to Bernoulli's principle:

[0005] The operating process of the present invention is as follows: by adjusting the height of the liquid level of the inlet reservoir relative to the center of the module (keeping the height of the liquid level of the inlet reservoir relative to the outlet reservoir unchanged), the liquid pressure in the center of the module can be changed while ensuring the constancy of the cooling liquid flow rate; further, adjusting the height of the inlet reservoir relative to the outlet reservoir (keeping the pressure of the inlet reservoir relative to the center of the module unchanged) can achieve the adjustment of the water flow rate in the center of the module while ensuring the stability of the pressure. A method for controlling pressure and flow rate based on the above-mentioned liquid-cooled sheet-shaped amplification module pressure balancing device is characterized in that it includes the following steps: Adjust the height of the first overflow pipe of the inlet reservoir to change its liquid level h1 to control the liquid pressure P2 at the center of the laser cooling module; Synchronously adjust the height of the second overflow pipe of the outlet reservoir to change the liquid level difference Δh=h1-h3 to control the coolant flow rate V2; Among them, when the flow rate needs to be kept constant, h1 and h3 are adjusted in the same proportion; when the pressure needs to be kept constant, the relative relationship between h1 and the module center height h2 remains unchanged. Furthermore, the pressure P2 at the laser cooling module is monitored in real time by a pressure sensor, and the height of the first overflow pipe is adjusted by feedback so that |P2-P0|≤10Pa (P0 is atmospheric pressure). At the same time, the present invention also provides an application of the above-mentioned liquid-cooled sheet amplifier module pressure balancing device in a laser amplifier, which is characterized in that it is used to balance the liquid pressure and atmospheric pressure on both sides of the porthole of the neodymium glass sheet amplifier module, and control the light spot wavefront distortion caused by the porthole deformation to within 0.3 wavelengths. Compared with the prior art, the present invention has the following beneficial effects: This invention effectively regulates the pressure in the center of the module while ensuring a constant flow rate. Experimental data shows that by reducing the pressure at the porthole, while maintaining a flow rate of 6 L / min, the spot distortion caused by pressure-induced porthole deformation is successfully limited to less than 0.3 λ (light wavelength). BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of the existing neodymium glass sheet amplification module

[0007] Figure 2 Schematic diagram of embodiment 1 (front view)

[0008] Figure 3 Schematic diagram of embodiment 1 (side view)

[0009] Figure 4 This is a schematic diagram of the laser module chip amplifier (P 液体压强 ≠p 大气压 ), the blue line in the picture is the porthole DETAILED DESCRIPTION The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings so that those skilled in the art can fully understand and implement the present invention. It should be understood that the scope of protection of the present invention is not limited to the following embodiments, and any improvements or modifications based on the principles of the present invention fall within the scope of protection of the present invention. The pressure balancing device of the liquid-cooled sheet-shaped amplifying module of the present invention mainly includes the following components (see Figure 2 、 Figure 3 ):

[0010] During operation, coolant flows from the water generator 10 through the water inlet pipe 8 into the inlet reservoir 2. The liquid in reservoir 2 then flows through pipe 3 and the cooling module to the outlet reservoir 6. Water that flows beyond the overflow pipe 1 flows back to the water generator through the first overflow recovery pipe 9. Simultaneously, the liquid in the outlet reservoir 6 also flows back to the water generator through the second overflow pipe 7 and the second overflow recovery pipe 11.

[0011] The first overflow pipe 1 and the second overflow pipe 7 are designed as detachable structures. By replacing pipe components of different lengths, the precise control of the reservoir liquid level can be achieved.

[0012] Raising the liquid level in inlet reservoir 2 relative to the center of module 4 (keeping the level of inlet reservoir 2 constant relative to outlet reservoir 6) increases the pressure of the liquid in the center of module 4 while ensuring a constant cooling liquid flow rate. Lowering the level will reduce the pressure. Increasing the level of inlet reservoir 2 relative to outlet reservoir 6 (keeping the pressure of inlet reservoir 2 constant relative to the center of module 4) increases the flow rate in the center of module 4 while ensuring a constant pressure. Lowering the level will reduce the flow rate. During this adjustment, it is crucial to ensure that the water level in inlet reservoir 2 is always higher than both the level of outlet reservoir 6 and the center of module 4.

[0013] The reservoirs 2 and 6 mentioned in Example 1 are rectangular structures measuring 200 mm × 100 mm × 450 mm and are made of stainless steel. The water inlet pipe 8 has an inner diameter of 8 mm and a length of 0.75 m; the first overflow recovery pipe 9 has an inner diameter of 12 mm and a length of 1 m; the first main cooling pipe 3, the second main cooling pipe 5, and the second overflow recovery pipe 11 all have inner diameters of 40 mm and lengths of 0.5 m, 1 m, and 2 m, respectively. All components are directly connected via threaded holes.

[0014] The hydraulic machinery model mentioned is CWUP-20 produced by Teyu Company.

Claims

1. A liquid-cooled sheet-shaped amplification module pressure balancing device, characterized in that: include: The inlet reservoir (2) and the outlet reservoir (6) are both rectangular parallelepiped structures with the top open to the atmosphere; a first overflow pipe (1) provided at the bottom of the inlet reservoir (2) and a second overflow pipe (7) provided at the bottom of the outlet reservoir (6); A laser cooling module (4) is connected to the inlet water reservoir (2) and the outlet water reservoir (6), and forms a coolant flow path through the first main cooling pipe (3) and the second main cooling pipe (5); A water pump (10) is equipped with a temperature control function, supplies liquid to the inlet reservoir (2) through a water inlet pipe (8), and realizes a closed-loop circulation through a first overflow recovery pipe (9) and a second overflow recovery pipe (11); The liquid pressure and flow rate at the laser cooling module (4) are independently controlled by adjusting the heights of the first overflow pipe (1) and the second overflow pipe (7).

2. The pressure balancing device for a liquid-cooled sheet-shaped amplification module according to claim 1, characterized in that: The first overflow pipe (1) and the second overflow pipe (7) are detachable structures, and the liquid level height can be adjusted in a step-by-step manner by replacing components of different lengths.

3. The pressure balancing device for a liquid-cooled sheet-shaped amplification module according to claim 1, characterized in that: At least one water inlet and two water outlets are provided on the side of the inlet reservoir (2) near the bottom, and are connected to a water pump (10) and a laser cooling module (4) respectively; A water inlet and a water outlet are provided on the side of the outlet reservoir (6) near the bottom, and are connected to the laser cooling module (4) and the water pump (10) respectively.

4. The pressure balancing device for a liquid-cooled sheet-shaped amplification module according to claim 1, characterized in that: The inner diameter of the water inlet pipe (8) is 6-10 mm, the inner diameters of the first main cooling pipe (3) and the second main cooling pipe (5) are 35-45 mm, and the inner diameters of the first overflow recovery pipe (9) and the second overflow recovery pipe (11) are 10-15 mm, thereby forming an inner diameter graded design of the pipe system.

5. The pressure balancing device for a liquid-cooled sheet-shaped amplification module according to claim 1, characterized in that: The water pump (10) has a flow feedback function and adjusts the output power in real time to maintain flow rate stability with an error range of ±0.1 L / min.

6. The pressure balancing device for a liquid-cooled sheet-shaped amplification module according to claim 1, characterized in that: The inlet reservoir (2) and the outlet reservoir (6) are made of stainless steel or polytetrafluoroethylene (PTFE), and the pipes are made of polyvinyl chloride (PVC) or fluoroplastics.

7. A method for controlling pressure and flow rate of a pressure balancing device for a liquid-cooled sheet-shaped amplification module according to any one of claims 1 to 6, characterized in that: The steps include: Adjusting the height of the first overflow pipe (1) of the inlet reservoir (2) to change its liquid level h1 to control the liquid pressure P2 at the center of the laser cooling module (4); Synchronously adjusting the height of the second overflow pipe (7) of the outlet reservoir (6) to change the liquid level height difference Δh=h1-h3 to control the coolant flow rate V2; Among them, when the flow rate needs to be kept constant, h1 and h3 are adjusted in the same proportion; when the pressure needs to be kept constant, the relative relationship between h1 and the module center height h2 remains unchanged.

8. The pressure and flow rate control method according to claim 7, characterized in that: The pressure P2 at the laser cooling module (4) is monitored in real time by a pressure sensor, and the height of the first overflow pipe (1) is adjusted by feedback so that |P2-P0|≤10Pa (P0 is atmospheric pressure).

9. Application of the liquid-cooled sheet-shaped amplifier module pressure balance device according to claims 1-6 in a laser amplifier, characterized in that: It is used to balance the liquid pressure and atmospheric pressure on both sides of the porthole of the neodymium glass sheet amplification module, and control the wavefront distortion of the light spot caused by the porthole deformation to within 0.3 wavelengths.

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