Device for effectively protecting beryllium window when vacuum beryllium window is exposed to atmosphere

Abstract

The utility model discloses a device for effectively protecting a vacuum beryllium window when the vacuum beryllium window is exposed to the atmosphere, which is characterized by comprising a beryllium sheet, a beryllium window flange, a vacuum pump, a nitrogen cylinder, a first angle valve, a second angle valve, a four-way joint and a needle valve, the beryllium sheet is welded on the beryllium window flange to form a beryllium window, and two ends are connected with the middle of bunch pipelines with different vacuum degrees; the two angle valves are mounted on bunching pipelines connected with the two ends of the beryllium window; a first interface of the four-way joint is connected with the nitrogen cylinder through a needle valve, a second interface is connected with the vacuum pump, a third interface is connected with the first angle valve through a corrugated pipe, and a fourth interface is connected with the second angle valve through a corrugated pipe. When the bunching pipeline needs to be exposed in the atmospheric environment, the vacuum degree of the bunching pipeline connected with the two ends of the beryllium window after nitrogen is filled into the bunching pipeline reaches the air pressure of the atmospheric environment through mutual matched operation of pre-pumping treatment of a vacuum pump, matching of an angle valve / a needle valve, protection measures of nitrogen filling and the like. The device can effectively prevent the beryllium window from being damaged.

Description

Technical Field

[0001] The utility model belongs to the field of synchrotron radiation X-ray optics technology and relates to a device for isolating a vacuum beryllium window and effectively protecting the beryllium window when it is exposed to the atmosphere. When the vacuum environment of a synchrotron radiation beamline is to be exposed to the atmosphere, the impact of air on the beryllium window is minimized to achieve the effect of effectively protecting the beryllium window from damage. Background Art

[0002] Metallic beryllium has a low atomic number and absorbs very little X-rays. X-rays have strong penetrating power for metallic beryllium and are almost transparent. Usually, thin beryllium sheets are welded to a metal flange to prepare a beryllium window flange. Beryllium is brittle, hard and toxic, and the manufacturing process is complicated, so even ordinary beryllium window flanges are expensive. However, beryllium window flanges are common components used in synchrotron radiation beamlines to isolate vacuum areas or to isolate the vacuum and atmospheric environments at the end of the beamline. They are indispensable. Usually, the upstream of the synchrotron radiation beamline is in a high vacuum environment, and the beryllium window flange is mainly used to isolate the vacuum environments on both sides; the one placed at the end is to isolate the vacuum and the atmospheric environment. There are two reasons for the isolation effect: one is that the vacuum equipment on both sides has different requirements for vacuum. For example, the vacuum degree of the upstream mirror box must reach ~10 -7 Pa, while the vacuum degree of ordinary equipment requires ~10 -5 Pa, and the vacuum degree at the end of the beamline is required to be ~10 -2 Pa or ~10 -1 Secondly, while ensuring minimal X-ray absorption, the isolation of the beryllium window flange ensures a gradual decrease in vacuum from upstream to downstream, reducing the number of vacuum pumps. Consequently, there is often a pressure difference on both sides of the beryllium window flange. When evacuating or exposed to the atmosphere, the thin beryllium sheet and the welds between the sheet and the flange are subjected to significant shear stress, making them susceptible to leaks.

[0003] Currently, an angle valve or needle valve is installed near the beryllium window flange at synchrotron radiation beamlines. When equipment in the vacuum of a synchrotron radiation beamline must be exposed to the atmosphere for maintenance or overhaul, the angle valve or needle valve is slowly opened to allow the beryllium window to be released into the atmosphere. This minimizes the impact of airflow on the beryllium window and reduces the probability of leakage caused by cracking of the beryllium plate in the beryllium window flange or cracking at the weld between the plate and the flange. However, the risk of beryllium window damage still exists. Utility Model Content

[0004] To address the challenges of the prior art, the present invention aims to provide a device for isolating a vacuum beryllium window and effectively protecting it from atmospheric exposure. This device, through the coordinated operation of a vacuum pump pre-evacuation process, angle valve / needle valve coordination, and nitrogen gas filling, effectively prevents damage to the beryllium window when the beamline is exposed to atmospheric vacuum.

[0005] The technical solution of the utility model is:

[0006] A device for isolating a vacuum beryllium window and effectively protecting the beryllium window when it is exposed to the atmosphere, characterized in that it includes a beryllium sheet 1, a beryllium window flange 2, a vacuum pump 3, a nitrogen bottle 4, a first angle valve 5, a second angle valve 6, a connecting valve, and a needle valve 8;

[0007] The beryllium sheet 1 is welded to the beryllium window flange 2 to form a beryllium window. The two ends of the beryllium window are used to connect the middle of beamline pipes with different vacuum degrees.

[0008] The first angle valve 5 is used to be installed on the cable bundle pipe connected to one end of the beryllium window; the second angle valve 6 is used to be installed on the cable bundle pipe connected to the other end of the beryllium window;

[0009] The first interface of the connecting valve is connected to the nitrogen bottle 4 through the needle valve 8, the second interface of the connecting valve is connected to the vacuum pump 3, the third interface of the connecting valve is connected to the first angle valve 5 through a bellows, and the fourth interface of the connecting valve is connected to the second angle valve 6 through a bellows. When it is necessary to expose the bundle line pipeline to the atmospheric environment, the needle valve 8, the first angle valve 5, and the second angle valve 6 are tightened, and the vacuum pump 3 is used to evacuate the bellows respectively, and then the vacuum pump 3 is closed and the first angle valve 5, the second angle valve 6 and the needle valve 8 are opened, so that the vacuum degree after the nitrogen is filled in the bundle line pipeline connected at both ends of the beryllium window reaches the atmospheric pressure.

[0010] Furthermore, the connecting valve is a four-way valve 7.

[0011] A device for isolating a vacuum beryllium window and effectively protecting the beryllium window when it is exposed to the atmosphere, characterized in that it includes a beryllium sheet 1, a beryllium window flange 2, a vacuum pump 3, a nitrogen bottle 4, a first angle valve 5, a connecting valve, and a needle valve 8;

[0012] The beryllium sheet 1 is welded to the beryllium window flange 2 to form a beryllium window, and one end of the beryllium window is used to connect beamline pipes with different vacuum degrees;

[0013] The first angle valve 5 is used to be installed on the wiring harness pipe;

[0014] The first interface of the connecting valve is connected to the nitrogen bottle 4 through the needle valve 8, the second interface of the connecting valve is connected to the vacuum pump 3, and the third interface of the connecting valve is connected to the first angle valve 5 through a bellows. When the wiring harness pipeline needs to be exposed to the atmospheric environment, the needle valve 8 and the first angle valve 5 are tightened, the bellows is pre-evacuated by the vacuum pump 3, and then the vacuum pump 3 is closed and the first angle valve 5 and the needle valve 8 are opened, so that the vacuum degree after the wiring harness pipeline is filled with nitrogen reaches the atmospheric pressure.

[0015] Furthermore, the connecting valve is a three-way valve.

[0016] The advantages of this utility model are as follows:

[0017] 1. Pre-evacuate the vacuum pump to achieve a preliminary balance of vacuum levels on both sides of the beryllium window flange of the synchrotron radiation beamline.

[0018] 2. Slowly introduce protective nitrogen through the needle valve to prevent direct exposure to moist air and achieve the effect of protecting the beryllium window.

[0019] 3. Through the pre-evacuation of the vacuum pump, slowly opening the angle valve to achieve the initial balance of vacuum on both sides of the beryllium window flange, and slowly filling the nitrogen protective gas until the atmospheric pressure, the effect of protecting the beryllium window is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a device used to isolate the vacuum beryllium window and effectively protect the beryllium window when it is exposed to the atmosphere.

[0021] Reference numerals: 1-beryllium sheet, 2-beryllium window flange, 3-vacuum pump, 4-nitrogen bottle, 5-first angle valve, 6-second angle valve, 7-four-way valve, 8-needle valve, 9-bellows. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0023] like Figure 1 This device effectively protects vacuum-insulated beryllium windows from atmospheric exposure. Beryllium windows within the vacuum of a synchrotron radiation beam are subject to shear stress for extended periods under varying pressure differentials. This device effectively prevents damage to both isolated vacuum windows and beryllium windows at the beamline's end when exposed to atmospheric conditions. By pre-evacuating the windows with a vacuum pump, combining angle and needle valves, and applying nitrogen gas, the device effectively prevents damage to the windows.

[0024] In the first case, the device is presented for a beryllium window in a vacuum. Figure 1 As shown, a beryllium sheet 1 is welded to a metal beryllium window flange 2 to form a beryllium window. The two ends of the beryllium window flange 2 are exposed to different vacuum levels. Typically, angle valves, such as first angle valve 5 and second angle valve 6, are installed on the cable bundle to expose the cable bundle to the atmosphere. The present novel inventive device includes a four-way valve 7, which is connected to a nitrogen cylinder 4 and a vacuum pump 3 via a needle valve 8. It also connects the vacuum environments on both sides of the beryllium window flange 2 via a bellows 9.

[0025] The main usage process includes: the first step is to connect the device to the vacuum beam line pipeline through the first angle valve 5 and the second angle valve 6, tighten the first angle valve 5 and the second angle valve 6 of the vacuum environment on both sides, and tighten the needle valve 8 connected to the nitrogen bottle 4. The second step is to open the vacuum pump 3 to pre-evacuate the air in the bellows 9 to achieve the purpose of pre-evacuation. Third, slowly open the first angle valve 5 and the second angle valve 6 on the beam line pipeline to connect the vacuum on both sides of the beryllium window. The fourth step is to slowly open the needle valve 8 and slowly introduce a nitrogen protective atmosphere until the vacuum degree on both sides of the beryllium window flange 2 reaches the atmospheric pressure. The vacuum pipeline on both sides of the beryllium window can be exposed to the atmospheric pressure environment. At this time, the vacuum pipeline can be disassembled and the beryllium window flange can be removed.

[0026] The second case is when the device is used for the beryllium window at the end of the beamline, i.e. Figure 1 In the atmospheric environment, the second angle valve 6 does not exist, and the corresponding four-way port 7 is connected with a blind plate or a three-way port. The rest of the situation is similar, that is, the device only pre-vacuums one side, then slowly opens the first angle valve 5, and then slowly opens the needle valve 8 to slowly introduce nitrogen protective atmosphere until the atmospheric pressure reaches the value.

[0027] While specific embodiments of the present invention are disclosed for illustrative purposes, their purpose is to facilitate understanding and implementation of the present invention. Those skilled in the art will appreciate that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the disclosed preferred embodiments; the scope of protection claimed by the present invention shall be determined by the scope of the claims.

Claims

1. A device for isolating a vacuum beryllium window and effectively protecting the beryllium window when it is exposed to the atmosphere, characterized in that: It includes a beryllium sheet (1), a beryllium window flange (2), a vacuum pump (3), a nitrogen bottle (4), a first angle valve (5), a second angle valve (6), a connecting valve, and a needle valve (8); The beryllium sheet (1) is welded to the beryllium window flange (2) to form a beryllium window, and the two ends of the beryllium window are used to connect the middle of beamline pipes with different vacuum degrees; The first angle valve (5) is used to be installed on the wire harness pipe connected to one end of the beryllium window; the second angle valve (6) is used to be installed on the wire harness pipe connected to the other end of the beryllium window; The first interface of the connecting valve is connected to the nitrogen bottle (4) through the needle valve (8), the second interface of the connecting valve is connected to the vacuum pump (3), the third interface of the connecting valve is connected to the first angle valve (5) through a bellows, and the fourth interface of the connecting valve is connected to the second angle valve (6) through a bellows. When it is necessary to expose the beam line pipeline to the atmospheric environment, the needle valve (8), the first angle valve (5), and the second angle valve (6) are tightened, and the vacuum pump (3) is used to evacuate the bellows respectively, and then the vacuum pump (3) is closed and the first angle valve (5), the second angle valve (6) and the needle valve (8) are opened, so that the vacuum degree of the beam line pipeline connected to the two ends of the beryllium window after being filled with nitrogen reaches the atmospheric pressure.

2. The device for isolating a vacuum beryllium window and effectively protecting the beryllium window when exposed to the atmosphere according to claim 1, characterized in that: The communication valve is a four-way valve (7).

3. A device for isolating a vacuum beryllium window and effectively protecting the beryllium window when it is exposed to the atmosphere, characterized in that: It includes a beryllium sheet (1), a beryllium window flange (2), a vacuum pump (3), a nitrogen bottle (4), a first angle valve (5), a connecting valve, and a needle valve (8); The beryllium sheet (1) is welded to the beryllium window flange (2) to form a beryllium window, and one end of the beryllium window is used to connect beamline pipes with different vacuum degrees; The first angle valve (5) is used for being installed on the wiring harness pipe; The first interface of the connecting valve is connected to the nitrogen bottle (4) through the needle valve (8), the second interface of the connecting valve is connected to the vacuum pump (3), and the third interface of the connecting valve is connected to the first angle valve (5) through a bellows. When it is necessary to expose the bundle line pipeline to the atmospheric environment, the needle valve (8) and the first angle valve (5) are tightened, the vacuum pump (3) is used to pre-evacuate the bellows, and then the vacuum pump (3) is closed and the first angle valve (5) and the needle valve (8) are opened, so that the vacuum degree of the bundle line pipeline after being filled with nitrogen reaches the atmospheric pressure.

4. The device for isolating a vacuum beryllium window and effectively protecting the beryllium window when exposed to the atmosphere according to claim 3, characterized in that: The connecting valve is a three-way valve.

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