A method for detecting the tightness of an oil box

Abstract

This invention relates to a method for testing the sealing performance of an oil box, comprising the following steps: Step 1: Injecting a detection gas, wherein the detection gas is a mixture of air and helium, into the oil box; Step 2: Placing the oil box in a ventilated environment and using a helium mass spectrometer's suction gun to move at a constant speed along the weld seam of the oil box; Step 3: Determining the sealing performance of the oil box based on the data displayed by the helium mass spectrometer. This invention uses air mixed with helium as the detection gas, combined with a helium mass spectrometer for oil box sealing performance testing. This method is not only simple to operate and eliminates the need for an environmental test chamber, but also offers high testing efficiency. Furthermore, the oil box will not be contaminated with oil before final installation, facilitating subsequent maintenance.

Description

Technical Field

[0001] This invention relates to the field of X-ray source product manufacturing, and more particularly to a method for detecting the sealing performance of an oil box. Background Technology

[0002] X-ray sources have wide applications in industry, medicine, and other fields. Currently, the most commonly used X-ray sources on the market generate X-rays by accelerating an electron beam to bombard a target material using a high-voltage electric field. The core component of an X-ray source is the X-ray tube, which operates at high voltages of tens of kilovolts to accelerate electrons and generates a significant amount of heat. Therefore, the voltage insulation and heat dissipation efficiency of the X-ray tube's operating environment are subject to high requirements.

[0003] In some miniaturized, portable X-ray sources, to address the insulation and heat dissipation requirements of the X-ray tube during operation, the X-ray tube and high-voltage circuitry are placed within a sealed enclosure (i.e., an oil box). This enclosure is filled with liquids such as transformer oil or silicone oil, whose insulating properties are far superior to air, thus creating a well-insulated and well-ventilated environment for the X-ray tube. However, during X-ray tube operation, the sealed enclosure experiences significant pressure due to increased internal temperature and liquid expansion. If the seal is inadequate, liquid leakage may occur, allowing air to enter the oil box, reducing its insulation and causing malfunctions in the high-voltage components. Therefore, when using this oil box design, it is crucial to ensure that the enclosure does not leak under a certain internal pressure.

[0004] Currently, the common oil box manufacturing process tests the box's sealing performance through an oil-filling test: the manufactured oil box is filled with working oil, sealed, placed in an environmental test chamber, heated to the designed maximum operating temperature, and left for a period of time to observe for any oil leakage. This method has several disadvantages: filling the oil box is time-consuming; if a leak is found, the inner surface of the box will be contaminated with oil due to the previous filling process, making cleaning and repair difficult; and for many production environments, environmental test chambers are limited, restricting the number of oil boxes that can be tested in batches simultaneously, indirectly limiting production capacity. Summary of the Invention

[0005] This invention provides a method for detecting the sealing performance of an oil box to solve the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for detecting the sealing performance of an oil box, comprising the following steps:

[0007] Step 1: Inject detection gas into the oil box. The detection gas is a mixture of air and helium.

[0008] Step 2: Place the oil box in a ventilated environment and use the suction gun of the helium mass spectrometer to move it at a constant speed along the weld seam of the oil box;

[0009] Step 3: Determine the airtightness of the oil box based on the display data of the helium mass spectrometer.

[0010] Preferably, the pressure P of the injected detection gas is 5% greater than the maximum design pressure that the oil box can withstand, and this pressure is greater than 1 standard atmosphere P. atm .

[0011] Preferably, the method for injecting detection gas into the oil box includes:

[0012] Seal the dry, empty oil container, then inject it with a pressure of P. He A volume of helium gas, V, wherein:

[0013]

[0014] Among them, V b This refers to the volume of the oil container.

[0015] Preferably, the air is compressed air.

[0016] Preferably, the method for injecting detection gas into the oil box includes:

[0017] First, inject oil into the oil box at a pressure of P. a Compressed air, then injected at a pressure of P He A volume of helium gas, V, wherein:

[0018]

[0019] Among them, V b This refers to the volume of the oil container.

[0020] Preferably, the oil box is provided with an elastic component inside.

[0021] Preferably, the elastic component includes an expansion joint or a compensator.

[0022] Preferably, the oil box is left to stand for 10 minutes.

[0023] Preferably, the moving speed of the suction gun is less than 2.5 cm / s.

[0024] Preferably, in areas with a high probability of leakage, the suction gun remains in place for more than 1 second.

[0025] Compared with the prior art, the method for detecting the sealing performance of the oil box provided by the present invention has the following advantages:

[0026] 1. This invention uses air mixed with helium as the detection gas, and uses a helium mass spectrometer to detect the sealing of the oil box. It is not only easy to operate, but also does not require an environmental test chamber and has high detection efficiency.

[0027] 2. The method provided by this invention ensures that the oil box will not be contaminated with oil before it is finally installed as a finished product, which facilitates subsequent maintenance. Attached Figure Description

[0028] Figure 1 This is a flowchart of a method for detecting the sealing performance of an oil box according to a specific embodiment of the present invention. Detailed Implementation

[0029] To illustrate the technical solutions of the invention in more detail, specific embodiments are listed below to demonstrate the technical effects; it should be emphasized that these embodiments are used to illustrate the invention and not to limit the scope of the invention.

[0030] The method for detecting the sealing performance of an oil box provided by this invention, such as Figure 1 As shown, it includes the following steps:

[0031] Step 1: Inject detection gas into the oil box. The detection gas is a mixture of air and helium.

[0032] Step 2: Place the oil box in a ventilated environment and zero the background reading of the helium mass spectrometer. Then, use the suction gun of the helium mass spectrometer to move at a constant speed along the weld seam of the oil box.

[0033] Step 3: Determine the airtightness of the oil box based on the display data of the helium mass spectrometer.

[0034] This invention determines whether an oil box is sealed by injecting air mixed with helium into the oil box to be tested, and using a helium mass spectrometer to detect helium leakage on the outside of the box. This method is not only simple to operate, but also does not require an environmental test chamber and has high testing efficiency. Before the final product is installed, the oil box will not be contaminated with oil, which facilitates subsequent maintenance.

[0035] In some embodiments, the pressure P of the injected detection gas is 5% greater than the maximum design pressure that the oil cartridge can withstand (which is determined during the design of the oil cartridge), and this pressure is greater than 1 standard atmosphere P. atm For example, for a typical small X-ray tube with a fixed anode, the maximum oil pressure that its oil chamber can withstand is 106 kPa. In some embodiments, elastic components, such as expansion joints or compensators, can be designed and introduced inside the oil chamber to absorb the pressure increase caused by the rise in oil temperature and volume expansion.

[0036] In some embodiments, a method for injecting detection gas into the oil box includes:

[0037] Seal the dry, empty oil container (at this point, the air pressure inside the oil container is 1 standard atmosphere P). atm Then inject it with a pressure of P. He A volume of helium gas, V, wherein:

[0038]

[0039] Among them, V b Let P be the volume of the oil container. Therefore, the pressure of the gas mixture inside the oil container is P.

[0040] If the oil box has a large volume or a high P value, more helium will be required. Therefore, in some other embodiments, the air may be compressed air.

[0041] At this time, the method for injecting detection gas into the oil box includes:

[0042] First, inject oil into the oil box at a pressure of P. a Compressed air, then injected at a pressure of P He A volume of helium gas, V, wherein:

[0043]

[0044] Among them, V b This reduces the volume of the oil container, thereby decreasing the amount of helium used.

[0045] In some embodiments, in step 2, the oil box is left to stand for 10 minutes, and the suction gun moves at a speed of less than 2.5 cm / s to ensure accurate detection results. In some embodiments, for locations with a high probability of leakage, such as the air inlet and outlet, the suction gun remains in place for more than 1 second to further improve detection accuracy. Of course, the moving speed of the helium mass spectrometer suction gun and the dwell time at locations with a high probability of leakage can also be adjusted according to the specifications of the helium mass spectrometer itself.

[0046] In summary, the method for detecting the sealing performance of an oil box provided by this invention includes the following steps: Step 1: Injecting a detection gas into the oil box, wherein the detection gas is a mixture of air and helium; Step 2: Placing the oil box in a ventilated environment and using the suction gun of a helium mass spectrometer to move at a constant speed along the weld seam of the oil box; Step 3: Determining the sealing performance of the oil box based on the display data of the helium mass spectrometer. This invention determines whether the oil box is sealed by injecting air mixed with helium into the oil box to be tested, combined with using a helium mass spectrometer to detect helium leakage on the outside of the box. This method is not only simple to operate and does not require an environmental test chamber, but also has high detection efficiency. Before final installation as a finished product, the oil box will not be contaminated with oil, facilitating subsequent maintenance.

[0047] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for detecting the sealing performance of an oil box, characterized in that, Includes the following steps: Step 1: Inject detection gas into the oil box. The detection gas is a mixture of air and helium. Step 2: Place the oil box in a ventilated environment and use the suction gun of the helium mass spectrometer to move it at a constant speed along the weld seam of the oil box; Step 3: Determine the airtightness of the oil box based on the display data of the helium mass spectrometer.

2. The method for detecting the sealing performance of an oil box as described in claim 1, characterized in that, The pressure P of the injected detection gas is 5% greater than the maximum design pressure that the oil box can withstand, and this pressure is greater than 1 standard atmosphere P. atm .

3. The method for detecting the sealing performance of an oil box as described in claim 2, characterized in that, The method for injecting detection gas into the oil box includes: Seal the dry, empty oil container, then inject it with a pressure of P. He A volume of helium gas, V, wherein: Among them, V b This refers to the volume of the oil container.

4. The method for detecting the sealing performance of an oil box as described in claim 2, characterized in that, The air is compressed air.

5. The method for detecting the sealing performance of an oil box as described in claim 4, characterized in that, The method for injecting detection gas into the oil box includes: First, inject oil into the oil box at a pressure of P. a Compressed air, then injected at a pressure of P He A volume of helium gas, V, wherein: Among them, V b This refers to the volume of the oil container.

6. The method for detecting the sealing performance of an oil box as described in claim 1, characterized in that, The oil box is equipped with an elastic component inside.

7. The method for detecting the sealing performance of an oil box as described in claim 6, characterized in that, The elastic component includes an expansion joint or a compensator.

8. The method for detecting the sealing performance of an oil box as described in claim 1, characterized in that, The oil box should be left to stand for 10 minutes.

9. The method for detecting the sealing performance of an oil box as described in claim 1, characterized in that, The suction gun moves at a speed of less than 2.5 cm / s.

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