Diffusion welding tool for glass microchannel reactor

Abstract

The utility model relates to the technical field of welding tools, and particularly discloses a glass microchannel reactor diffusion welding tool which comprises a device shell, two protective doors are hinged to the outer wall of the device shell, the side wall of the device shell is communicated with an electromagnetic valve, one side of the electromagnetic valve is communicated with an air inlet pipe, and the other side of the electromagnetic valve is communicated with an air outlet pipe. And a limiting mechanism for limiting the reactor is arranged in the device shell. Through the arranged limiting mechanism, the micro-channel reactor body can be clamped and fixed, the welding temperature reaches the glass softening temperature, the tool pressure valve is adjusted to 0.5 MPa, equipment heating is stopped after heat preservation and pressure maintaining are conducted for 10 minutes, when the equipment temperature is lower than the glass softening temperature, the tool pressure valve is adjusted to 0.2 MPa, and a product is taken out when the temperature is reduced to the room temperature; in the diffusion welding process, due to the fact that the glass base body in the cavity area of the flow channel is supported by gas pressure, the collapse situation cannot occur.

Description

Technical Field

[0001] This utility model relates to the field of welding fixture technology, and in particular to a diffusion welding fixture for a glass microchannel reactor. Background Technology

[0002] Diffusion welding fixtures for glass microchannel reactors are crucial for ensuring high-precision, high-strength connections of the microchannel structure under high temperature and pressure. Glass microchannel reactors are irreplaceable in photocatalytic reactions. However, due to the inherent brittleness of glass, traditional sealing ring compression methods for manufacturing glass reactors suffer from high scrap rates, low compression force leading to reactant leakage risks during use, and high compression force causing glass breakage. Manufacturing glass microchannel reactors using diffusion welding requires heating temperatures above the glass softening temperature to prevent glass breakage during welding and to ensure better adhesion of the weld surfaces, resulting in high-quality welds.

[0003] Existing diffusion welding methods suffer from large pressure fluctuations, low precision, and poor stability when the hydraulic system pressure is low, making effective diffusion welding or even impossible.

[0004] An existing patent (publication number: CN215468771U) discloses a diffusion welding device, which includes a hydraulic cylinder, a first pressure head, a second pressure head, and a pressure supplementing component. By setting the pressure supplementing component, it increases the total contact area with the first pressure head by S1 during pressurization. When the required welding pressure for the product to be welded is relatively low, the increased total contact area with the first pressure head leads to a higher working pressure for welding. In this case, the pressure value of the hydraulic system needs to be increased. After the pressure is increased, the pressure stability and accuracy are improved, and the first pressure head can stably apply pressure to the product to be welded, causing stable plastic deformation of the product, ensuring effective diffusion welding, and achieving good welding results.

[0005] To address the aforementioned issues, existing patents have proposed solutions that increase the total contact area with the first pressure head by S1 through the addition of a pressure supplement component. This increases the total contact area with the first pressure head and improves pressure stability when the required welding pressure for the product to be welded is relatively low. However, because the heating temperature is higher than the glass softening temperature, the glass softens. During diffusion welding, the microchannel area becomes hollow and unsupported, leading to collapse of the glass substrate after welding. This reduces the cross-sectional area of ​​the reaction channel, lowers the product reaction efficiency, and may even cause the product to fail to meet usage requirements. Summary of the Invention

[0006] The purpose of this invention is to provide a diffusion welding fixture for a glass microchannel reactor, which can clamp and fix the microchannel reactor body. When the welding temperature reaches the glass softening temperature, the fixture pressure valve is adjusted to 0.5 MPa, and the heating is turned off after 10 minutes of heat and pressure holding. When the equipment temperature is lower than the glass softening temperature, the fixture pressure valve is adjusted to 0.2 MPa, and the product is removed when the temperature drops to room temperature. During the diffusion welding process, the glass substrate in the flow channel cavity area is supported by gas pressure, so no collapse will occur, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a glass microchannel reactor diffusion welding fixture, including a device shell, two protective doors hinged to the outer wall of the device shell, a solenoid valve connected to the side wall of the device shell, an air inlet pipe connected to one side of the solenoid valve, a limiting mechanism for limiting the position of the reactor provided inside the device shell, and a pressure relief mechanism for depressurization provided on the upper surface of the device shell.

[0008] The limiting mechanism includes a dual-axis motor, which is fixed to the lower end of the device housing by screws. The power output shaft of the dual-axis motor is fixed with a threaded rod, and a slider is threadedly connected to the outer surface of the threaded rod. A clamping plate is welded to the upper surface of the slider.

[0009] Preferably, the lower end of the clamping plate is slidably connected to a limiting groove formed on the inner wall of the device housing, and the side wall of the clamping plate is connected to the microchannel reactor body.

[0010] Preferably, the pressure relief mechanism includes an exhaust pipe connected to the upper surface of the device housing, and a fixing plate is fixed to the lower end of the exhaust pipe.

[0011] Preferably, a flow limiting plate is movably connected to the upper surface of the fixed plate, and a compression spring is fixed to the upper surface of the flow limiting plate.

[0012] Preferably, the upper end of the compression spring is fitted with a connecting piece, and two guide rods that are welded to the fixing plate pass through the interior of the flow limiting plate.

[0013] Preferably, the upper surface of the connector is welded with a threaded tube, and the upper end of the threaded tube is threadedly connected to a lead screw.

[0014] Preferably, the upper surface of the guide rod is welded with a mounting plate that is fixed to the exhaust pipe, the upper surface of the mounting plate is fixed with a stepper motor by screws, and the lower surface of the mounting plate is fixed with a pressure sensor by screws.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The microchannel reactor body can be clamped and fixed by the setting limiting mechanism. When the welding temperature reaches the glass softening temperature, the tooling pressure valve is adjusted to 0.5MPa. After holding the temperature and pressure for 10 minutes, the equipment heating is turned off. When the equipment temperature is lower than the glass softening temperature, the tooling pressure valve is adjusted to 0.2MPa. When the temperature drops to room temperature, the product is taken out. During the diffusion welding process, the glass substrate in the flow channel cavity area is supported by the gas pressure, so there will be no collapse.

[0017] 2. Through the pressure relief mechanism, when the internal pressure exceeds the set value, the excessive pressure will push the flow limiting plate to separate from the fixed plate. The guide rod plays a guiding role, so that the air pressure can be discharged to the outside through the flow limiting plate, and the pressure will be automatically released to reduce the pressure to the set value. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a half-sectional structural diagram of the outer shell of the device of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the outer shell of the device of this utility model;

[0022] Figure 4 This is a half-sectional structural diagram of the exhaust pipe of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Device housing; 2. Protective door; 3. Solenoid valve; 4. Air inlet pipe; 5. Dual-axis motor; 51. Threaded rod; 52. Slider; 53. Clamping plate; 54. Limiting groove; 55. Microchannel reactor body; 6. Exhaust pipe; 61. Fixing plate; 62. Flow limiting plate; 63. Compression spring; 64. Connecting piece; 65. Guide rod; 66. Threaded pipe; 67. Lead screw; 68. Mounting plate; 69. Stepper motor; 7. Pressure sensor. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] Please see Figures 1 to 4 A diffusion welding fixture for a glass microchannel reactor includes a device housing 1, with two protective doors 2 hinged to the outer wall of the device housing 1, a solenoid valve 3 connected to the side wall of the device housing 1, an air inlet pipe 4 connected to one side of the solenoid valve 3, a limiting mechanism for limiting the reactor inside the device housing 1, and a pressure relief mechanism for depressurization on the upper surface of the device housing 1.

[0028] The limiting mechanism includes a dual-axis motor 5, which is fixed to the lower end of the device housing 1 by screws. The power output shaft of the dual-axis motor 5 is fixed with a threaded rod 51. The outer surface of the threaded rod 51 is threadedly connected to a slider 52. A clamping plate 53 is welded to the upper surface of the slider 52. The lower end of the clamping plate 53 is slidably connected to a limiting groove 54 opened in the inner wall of the device housing 1. The side wall of the clamping plate 53 is connected to the microchannel reactor body 55.

[0029] By adopting the above technical solution, before using the glass microchannel reactor diffusion welding fixture, the outer shell 1 of the device is first placed in a suitable position. During use, the protective door 2 on the outer shell 1 is opened, and then the microchannel reactor body 55 is placed inside the outer shell 1. The dual-axis motor 5 drives the two threaded rods 51 to rotate, which in turn drives the threaded slider 52 to move horizontally, causing the two clamping plates 53 to move closer together, clamping and fixing the microchannel reactor body 55. The limiting groove 54 provided inside the outer shell 1 serves as a guide and limit. After placement, the protective door 2 is closed to seal the device. The inlet pipe 4 is connected to an external gas filling device, and the solenoid valve 3 is opened, allowing the gas filling device to fill the device with gas, which can be argon or nitrogen. The gas filling pressure... The pressure can be set to 5MPa for vacuum diffusion welding. A gas pressure of 5MPa can be introduced, and after inflation, solenoid valve 3 is closed. At this point, pressure is applied to the entire welding surface of the product inside the fixture. Under this pressure, normal diffusion welding can be performed. During welding, a small pressure is designed to prevent the glass, which is still brittle at low temperatures, from breaking under high pressure. When the welding temperature reaches the glass softening temperature and is held for 5 minutes, the fixture pressure valve is adjusted to 0.5MPa. After holding the temperature and pressure for 10 minutes, the equipment heating is turned off. When the equipment temperature drops below the glass softening temperature, the fixture pressure valve is adjusted to 0.2MPa. The product is removed when the temperature drops to room temperature. During diffusion welding, the glass substrate in the flow channel cavity area is supported by gas pressure, preventing collapse.

[0030] Specifically, such as Figures 1-4 As shown, the pressure relief mechanism includes an exhaust pipe 6, which is connected to the upper surface of the device housing 1. A fixing plate 61 is fixed to the lower end of the exhaust pipe 6. A flow limiting plate 62 is movably connected to the upper surface of the fixing plate 61. A compression spring 63 is fixed to the upper surface of the flow limiting plate 62. A connecting piece 64 is sleeved on the upper end of the compression spring 63. Two guide rods 65, which are welded to the fixing plate 61, pass through the interior of the flow limiting plate 62. A threaded tube 66 is welded to the upper surface of the connecting piece 64. A lead screw 67 is threaded to the upper end of the threaded tube 66. An installation plate 68, which is fixed to the exhaust pipe 6, is welded to the upper surface of the guide rods 65. A stepper motor 69 is fixed to the upper surface of the installation plate 68 by screws. A pressure sensor 7 is fixed to the lower surface of the fixing plate 61 by screws.

[0031] By adopting the above technical solution, through the exhaust pipe 6, when the internal pressure exceeds the set value, the excessive pressure will push the flow limiting plate 62 to separate from the fixed plate 61. The guide rod 65 plays a guiding role, allowing the air pressure to be discharged to the outside through the flow limiting plate 62, automatically releasing air to reduce the pressure to the set value. The air pressure sensor 7 can detect the internal pressure, and the detected data is sent to the microcontroller via wires for processing and comparison with the preset air pressure threshold. The microcontroller controls the stepper motor 69 on the mounting plate 68 to run, which can drive the lead screw 67 to rotate, thereby driving the threaded tube 66 to move vertically, so that the connecting piece 64 presses the compression spring 63, causing the tension of the compression spring 63 to change, which can adjust the automatic air pressure release value.

[0032] Working principle: The microchannel reactor body 55 is placed inside the device housing 1. The dual-axis motor 5 drives the two threaded rods 51 to rotate, which in turn drives the threaded slider 52 to move horizontally, causing the two clamping plates 53 to move closer together and clamp and fix the microchannel reactor body 55. The limiting groove 54 set inside the device housing 1 can play a guiding and limiting role. After placement, the protective door 2 is closed, and the air inlet pipe 4 is connected to the external gas filling equipment. The solenoid valve 3 is opened, and the gas filling equipment fills the device with gas. The gas can be argon or nitrogen. The gas filling pressure can be set. For example, if a welding pressure of 5MPa is required for vacuum diffusion welding, a gas pressure of 5MPa can be filled. After filling, the solenoid valve 3 is closed. At this time, pressure is applied to the entire welding surface of the product inside the tooling. Under this pressure, normal diffusion welding can be performed. When the internal pressure exceeds the set value, the excessive pressure will push the flow limiting plate 62 to separate from the fixed plate 61, so that the gas pressure can be discharged to the outside through the flow limiting plate 62. The pressure is automatically released to reduce the pressure to the set value. The pressure sensor 7 is set to detect the internal pressure. The detected data is sent to the microcontroller via wires for processing and comparison with the preset pressure threshold. The microcontroller controls the stepper motor 69 on the mounting plate 68 to rotate the lead screw 67, which in turn drives the threaded tube 66 to move vertically. This causes the connector 64 to press the clamping spring 63, changing the tension of the clamping spring 63 and adjusting the automatic air pressure release value. During welding, a small pressure is designed to prevent the glass, which is still brittle at low temperatures, from breaking under high pressure. When the welding temperature reaches the glass softening temperature and is held for 5 minutes, the tooling pressure valve is adjusted to 0.5 MPa. After holding the temperature and pressure for 10 minutes, the equipment heating is turned off. When the equipment temperature is lower than the glass softening temperature, the tooling pressure valve is adjusted to 0.2 MPa. The product is removed when the temperature drops to room temperature. During diffusion welding, the glass substrate in the flow channel cavity area is supported by gas pressure, so it will not collapse.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A glass microchannel reactor diffusion welding tooling comprising a device housing (1), characterized in that: The outer wall of the device housing (1) is hinged with two protective doors (2). The side wall of the device housing (1) is connected to a solenoid valve (3). One side of the solenoid valve (3) is connected to an air inlet pipe (4). The inside of the device housing (1) is provided with a limiting mechanism for limiting the position of the reactor. The upper surface of the device housing (1) is provided with a pressure relief mechanism for depressurization. The limiting mechanism includes a dual-axis motor (5), which is fixed to the lower end of the device housing (1) by screws. The power output shaft of the dual-axis motor (5) is fixed with a threaded rod (51), and a slider (52) is threadedly connected to the outer surface of the threaded rod (51). A clamping plate (53) is welded to the upper surface of the slider (52).

2. The glass microchannel reactor diffusion bonding tooling of claim 1, wherein: The lower end of the clamping plate (53) is slidably connected to a limiting groove (54) opened on the inner wall of the device housing (1), and the side wall of the clamping plate (53) is connected to the microchannel reactor body (55).

3. The glass microchannel reactor diffusion bonding tooling of claim 2, wherein: The pressure relief mechanism includes an exhaust pipe (6), which is connected to the upper surface of the device housing (1), and a fixing plate (61) is fixed inside the lower end of the exhaust pipe (6).

4. The glass microchannel reactor diffusion bonding tooling of claim 3, wherein: The upper surface of the fixed plate (61) is movably connected to the flow limiting plate (62), and the upper surface of the flow limiting plate (62) is fixed with a compression spring (63).

5. A glass microchannel reactor diffusion bonding tooling according to claim 4, wherein: The upper end of the compression spring (63) is fitted with a connector (64), and the interior of the flow limiting plate (62) has two guide rods (65) that are welded to the fixing plate (61).

6. A glass microchannel reactor diffusion bonding tooling according to claim 5, wherein: The upper surface of the connector (64) is welded with a threaded tube (66), and the upper end of the threaded tube (66) is threaded with a lead screw (67).

7. A glass microchannel reactor diffusion bonding tooling according to claim 6, wherein: The upper surface of the guide rod (65) is welded with a mounting plate (68) that is fixed to the exhaust pipe (6). The upper surface of the mounting plate (68) is fixed with a stepper motor (69) by screws, and the lower surface of the fixing plate (61) is fixed with a pressure sensor (7) by screws.

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