A high-power pulsed ultraviolet xenon lamp and a manufacturing process thereof

Abstract

The application discloses a high-power pulse ultraviolet xenon lamp and a manufacturing process thereof. The electrode assembly of the high-power pulse ultraviolet xenon lamp is coated with an inner glass layer and an outer glass layer when being sealed. The outer glass layer is sealed with a high-purity flint glass tube, and the high-purity flint glass tube has higher airtightness. Meanwhile, the problem of uneven stress distribution of the high-purity flint glass tube when being sealed by using a traditional sealing method is solved, and the mechanical resistance and transmittance of the high-purity flint glass tube are ensured. The connecting rod in the electrode assembly improves the high-temperature and high-pressure stability of the lamp tube under inputted medium and high pulse voltage, prolongs the service life of the lamp tube, and obtains stable high-intensity ultraviolet light.

Description

Technical Field

[0001] This invention relates to the field of ultraviolet xenon lamp technology, specifically to a high-power, high-intensity ultraviolet xenon lamp with a peak wavelength of 229.5nm (±0.5nm), characterized by high mechanical performance and energy load, long service life, high power and high-density current input, reliable operation without explosion, high temperature and high pressure resistance, and near full-spectrum high-power pulsed ultraviolet xenon lamp and its manufacturing process. Background Technology

[0002] Ultraviolet (UV) sterilization is a physical cold sterilization technology with unparalleled advantages over chemical sterilization methods. Therefore, pulsed UV xenon lamps are widely used in disinfection and sterilization. Traditional pulsed UV xenon lamps are manufactured using fused composite quartz materials for the tube wall, employing a layered molding process combined with a tube drawing mechanism. This requires high precision in the electrode sealing process at both ends of the lamp tube, especially under high-power input. Furthermore, in traditional UV xenon lamps, the electrodes at both ends are directly clamped to the lamp tube at high temperatures during production. This sealing method results in uneven stress distribution at the lamp tube sealing points under high-power pulse voltage and high-density current input, weakening the lamp's resistance to high temperatures and pressures, reducing operational stability, increasing the risk of lamp explosion, and shortening its lifespan. Additionally, due to the high intensity of UV radiation, adding other elements to the quartz glass tube can reduce its mechanical strength and impact resistance. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a high-power pulsed ultraviolet xenon lamp with high pulsed power input, high temperature and high pressure resistance, stable tube wall stress, high ultraviolet transmittance, and long lamp tube life, as well as its manufacturing process.

[0004] The objective of this invention is achieved through the following technical solution: a high-power pulsed ultraviolet xenon lamp, comprising a high-purity ultraviolet-transmitting quartz glass tube and two electrode assemblies respectively sealed at both ends of the high-purity ultraviolet-transmitting quartz glass tube by a sealing structure; the sealing structure comprises an inner glass layer moltenly coated on the outside of the electrode assemblies and an outer glass layer moltenly coated on the outside of the inner glass layer; the outer glass layer is sealed to the high-purity ultraviolet-transmitting quartz glass tube; the interior of the high-purity ultraviolet-transmitting quartz glass tube is filled with a mixed gas.

[0005] The electrode assembly includes a discharge electrode rod, a connecting rod connected to the discharge electrode rod, and an electrode connected to the connecting rod. The diameter of the connecting rod is 40-50% of the diameter of the discharge electrode rod and the electrode. The inner glass layer is fused and coated onto the outer side of the connecting rod near the electrode, with a maximum coating length not exceeding one-quarter of the length of the connecting rod. The discharge electrode rod and the connecting rod are located inside the high-purity violet-transparent quartz glass tube, and the electrode is located on the outer side of the high-purity violet-transparent quartz glass tube.

[0006] Both the discharge electrode rod and the connecting rod are made of cerium-tungsten alloy, and the electrode is made of copper.

[0007] The outer glass layer is located near the electrode of the inner glass layer, and the length of the outer glass layer is 1 / 3 of the length of the inner glass layer.

[0008] The inner glass layer comprises SiO2, B2O3, and Al2O3 in a ratio of 85:3:12; the outer glass layer comprises SiO2, B2O3, and Al2O3 in a ratio of 79:10:11.

[0009] The thickness of both the inner and outer glass layers is 30% to 50% of the thickness of the high-purity ultraviolet-transparent quartz glass tube.

[0010] The high-purity violet-transmitting quartz glass tube has winding posts on the outer sides of its two end caps, and nickel wire is evenly wound around the outer side of the high-purity violet-transmitting quartz glass tube. The two ends of the nickel wire are fixed to the two winding posts respectively.

[0011] There is a gap of 0.2 to 0.4 mm between the nickel wire and the outer wall of the high-purity ultraviolet quartz glass tube.

[0012] The pressure of the mixed gas is 80-100 Pa, and the mixed gas is a mixture of xenon and argon; wherein the ratio of xenon to argon is 9:1.

[0013] A manufacturing process for a high-power pulsed ultraviolet xenon lamp includes the following steps:

[0014] Step 1: Take a high-purity amethyst glass tube with a diameter of 8-12mm, a wall thickness of 1-1.5mm, and a length of 350-400mm;

[0015] Step 2: Take two electrode assemblies and use an oxyhydrogen flame to melt and closely coat a layer of glass inner layer on the outside of the connecting rod of the electrode assembly near the electrode position. During the coating process, argon gas is introduced into the connecting rod. After the glass inner layer cools down, use an oxyhydrogen flame to melt and closely coat a layer of glass outer layer on the outside of the glass inner layer near the electrode position.

[0016] Step 3: Insert the discharge rod and connecting rod of one of the electrode components into one end of the high-purity ultraviolet-transmitting quartz glass tube, with the electrode outside the sealing interface. Then, use high-purity quartz to seal the outer layer of the glass to the high-purity ultraviolet-transmitting quartz glass tube.

[0017] Step 4: Insert the discharge rod and connecting rod of another electrode assembly from the other end of the high-purity ultraviolet quartz glass tube. The electrode is outside the sealing interface. Then, fill the high-purity ultraviolet quartz glass tube with mixed gas from this end. Use high-purity quartz to seal the outer glass layer of the electrode assembly to the high-purity ultraviolet quartz glass tube.

[0018] Step 5: Weld a winding column to each end of the high-purity ultraviolet quartz glass tube;

[0019] Step 6: Evenly wind nickel wire around the outside of a high-purity ultraviolet-transmitting quartz glass tube, and fix the two ends of the nickel wire to two winding posts respectively to obtain a high-power pulsed ultraviolet xenon lamp.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] (1) When sealing the electrode assembly of the present invention, an inner glass layer and an outer glass layer are first wrapped on the electrode assembly. The outer glass layer is sealed with a high-purity violet-transmitting quartz glass tube, which has higher air tightness and prevents gas leakage inside the high-purity violet-transmitting quartz glass tube. At the same time, it solves the problem of uneven stress distribution at the sealing interface of the high-purity violet-transmitting quartz glass tube when using traditional sealing methods. It retains the mechanical resistance and transmittance of the high-purity violet-transmitting quartz glass tube, reduces the efficiency of temperature conduction to the electrode during operation, thereby improving the high-power pulsed ultraviolet xenon lamp's high-temperature and high-pressure stability under medium and high pulse voltage input, and extending the lamp tube's service life.

[0022] (2) The electrode assembly of the present invention consists of a discharge rod, a connecting rod connected to the discharge rod, and an electrode connected to the connecting rod. The diameter of the connecting rod is 40-50% of that of the discharge rod and the electrode. This creates a certain gap between the electrode and the discharge rod, resulting in a conduction difference between the electrode temperature and the temperature of the discharge rod inside the lamp tube. The discharge sputtering is mainly concentrated in the gap, reducing the impact on the ultraviolet transmittance of the lamp tube body, improving the high temperature resistance coefficient during lamp tube operation, and further extending the service life of the lamp tube.

[0023] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, and upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0024] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0025] Figure 1 This is a structural diagram of the pulsed ultraviolet xenon lamp of the present invention.

[0026] Figure 2 This is a structural diagram of the electrode assembly of the present invention.

[0027] Figure 3 This is a cross-sectional view of the inner and outer glass layers covering the electrode assembly of the present invention.

[0028] The reference numerals in the above figures are as follows: 1—quartz glass tube, 2—nickel wire, 3—outer glass layer, 4—winding column, 5—electrode assembly, 6—discharge rod, 7—electrode, 8—inner glass layer, 9—connecting rod, 10—gap. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that if the terms "first," "second," etc., are used in the specification, claims, and accompanying drawings of this application, they are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] In this application, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] Furthermore, in this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Example

[0036] like Figure 1 As shown, this embodiment discloses a high-power pulsed ultraviolet xenon lamp, which includes a high-purity violet-transmitting quartz glass tube 1 and two electrode assemblies 5 respectively sealed to both ends of the high-purity violet-transmitting quartz glass tube 1 by a sealing structure. The high-purity violet-transmitting quartz glass tube 1 is filled with a mixed gas with a pressure of 80-100 Pa. In this embodiment, the pressure of the mixed gas is 100 Pa. When the maximum input power is 2000 W, the pulsed ultraviolet xenon lamp can generate a broad-spectrum ultraviolet band of 220-280 nm, with a peak wavelength of 229.5 nm (±0.5 nm). The ultraviolet C band is mainly distributed in the 220-280 nm range. In addition, the mixed gas is a mixture of xenon and argon, wherein the ratio of xenon to argon is 9:1.

[0037] Specifically, the high-purity ultraviolet-transmitting quartz glass tube 1 is a high-transmitting quartz glass tube with an ultraviolet transmittance of over 92%, and the high-purity ultraviolet-transmitting quartz glass tube 1 can be a straight tube, a U-shaped tube, or a disc tube. In this embodiment, the high-purity ultraviolet-transmitting quartz glass tube 1 is implemented using a straight tube.

[0038] like Figure 2 As shown, the electrode assembly 5 includes a discharge rod 6, a connecting rod 9 connected to the discharge rod 6, and an electrode 7 connected to the connecting rod 9. The diameter of the connecting rod 9 is 40% of the diameters of the discharge rod 6 and the electrode 7, creating a gap 10 between the electrode 7 and the discharge rod 6. After the electrode assembly 5 is sealed to the high-purity violet-transparent quartz glass tube 1, the discharge rod 6 and the connecting rod 9 are located inside the high-purity violet-transparent quartz glass tube 1, and the electrode 7 is located outside the high-purity violet-transparent quartz glass tube 1. Both the discharge rod 6 and the connecting rod 9 are cerium-tungsten alloy rods, while the electrode 7 is a copper rod. In a specific configuration, the discharge rod 6 and the connecting rod 9 are integrally formed, while the connecting rod 9 and the electrode 7 can be connected by a threaded hole and then welded to improve the stability of the connection.

[0039] This invention sets the diameter of the connecting rod 9 to 40% of the diameters of the discharge rod 6 and the electrode 7, creating a gap 10 between the electrode 7 and the discharge rod 6. Due to the temperature difference between the electrode and the internal temperature of the high-purity ultraviolet-transmitting quartz glass tube 1, discharge sputtering mainly occurs at the gap, reducing the impact on the ultraviolet transmittance of the high-purity ultraviolet-transmitting quartz glass tube 1, improving the high-temperature resistance coefficient during lamp operation, and thus extending the lifespan of the lamp.

[0040] In this embodiment, the two electrode components 5 are a positive electrode component and a negative electrode component, and the electrodes 7 on the two electrode components 5 can be set to different sizes to prevent the positive and negative electrodes from being reversed when using a pulsed ultraviolet xenon lamp, thereby improving the safety of product use.

[0041] like Figure 3 As shown, the sealing structure includes an inner glass layer 8 fused to the outside of the connecting rod 9 and an outer glass layer 3 fused to the outside of the inner glass layer 8; the outer glass layer 3 is sealed to the high-purity ultraviolet quartz glass tube 1.

[0042] In a specific configuration, the outer glass layer 3 is located near the electrode of the inner glass layer 8, and its length is one-third of the length of the inner glass layer 8. Furthermore, the inner glass layer 8 comprises SiO2, B2O3, and Al2O3 in a ratio of 85:3:12. The outer glass layer 3 comprises SiO2, B2O3, and Al2O3 in a ratio of 79:10:11. The thickness of both the inner glass layer 8 and the outer glass layer 3 is 30% to 50% of the thickness of the high-purity violet-transparent quartz glass tube 1; in this embodiment, both the inner glass layer 8 and the outer glass layer 3 are 40% of the thickness of the high-purity violet-transparent quartz glass tube 1.

[0043] During the sealing process, the electrode assembly 5 is first covered with an inner glass layer 8 and an outer glass layer 3 on the connecting rod near the electrode position 9. The outer glass layer 3 is then sealed to the high-purity violet-transmitting quartz glass tube 1, resulting in higher airtightness and preventing gas leakage from the high-purity violet-transmitting quartz glass tube 1. This also solves the problem of uneven stress distribution during sealing of the high-purity violet-transmitting quartz glass tube 1, ensuring its mechanical resistance and transmittance. This improves the high-power pulsed ultraviolet xenon lamp's high-temperature and high-pressure stability under medium-to-high pulse voltage input and extends its service life.

[0044] like Figure 1 As shown, the high-purity ultraviolet-transmitting quartz glass tube 1 has winding posts 4 at both ends. Nickel wire 2 is evenly wound around the outside of the high-purity ultraviolet-transmitting quartz glass tube 1, with both ends of the nickel wire 2 fixed to the two winding posts 4. Specifically, during winding, there is a gap of 0.2–0.4 mm between the nickel wire 2 and the outer wall of the high-purity ultraviolet-transmitting quartz glass tube 1. In this embodiment, the gap between the nickel wire 2 and the outer wall of the high-purity ultraviolet-transmitting quartz glass tube 1 is set to 0.3 mm. This prevents the nickel wire 2 from breaking due to vibrations that may occur during high-power operation of the pulsed ultraviolet xenon lamp, thus affecting the stability of the pulsed ultraviolet xenon lamp's operation. The nickel wire 2, wound around the outside of the high-purity ultraviolet-transmitting quartz glass tube 1, assists in the high-voltage electric pulse excitation of xenon gas, making it easier for the pulsed ultraviolet xenon lamp to illuminate stably.

[0045] The manufacturing process of the aforementioned high-power pulsed ultraviolet xenon lamp includes the following steps:

[0046] Step 1: Take a high-purity transparent violet quartz glass tube with a diameter of 9mm, a wall thickness of 1mm, and a length of 380mm.

[0047] Step 2: Take two electrode assemblies 5. Using an oxyhydrogen flame, melt and tightly coat a layer of inner glass 8 on the outside of the connecting rod 9 of the electrode assembly 5 near the electrode 7. During the coating process, slowly introduce argon gas into the connecting rod 9. Argon gas is an inert gas that can protect the coated area. After the inner glass layer 8 cools down, melt and tightly coat a layer of outer glass 3 on the outside of the inner glass layer 8 near the electrode 7 using an oxyhydrogen flame.

[0048] Step 3: Insert the discharge rod 6 and connecting rod 9 of one of the electrode components 5 into one end of the high-purity ultraviolet-transmitting quartz glass tube 1, with the electrode 7 outside the sealing interface. Then, use high-purity quartz to seal the outer glass layer 3 to the high-purity ultraviolet-transmitting quartz glass tube 1 at high temperature.

[0049] Step 4: Insert the discharge rod 6 and connecting rod 9 of the other electrode assembly 5 into the other end of the high-purity ultraviolet-transparent quartz glass tube 1, with the electrode 7 outside the sealing interface. Inject a mixed gas into the high-purity ultraviolet-transparent quartz glass tube 1 from this end. Use high-purity quartz of the same material as the high-purity ultraviolet-transparent quartz glass tube 1 to seal the glass outer layer 3 of the electrode assembly 5 to the high-purity ultraviolet-transparent quartz glass tube 1 at high temperature. After the two electrode assemblies 5 are sealed, polish the electrodes 7 on both electrode assemblies 5 to remove the oxide surface layer generated during the sealing process, while ensuring that the electrode size error rate is within the design range.

[0050] Step 5: Weld a winding column 4 to each end of the high-purity ultraviolet quartz glass tube 1.

[0051] Step 6: Evenly wind nickel wire 2 around the outside of the high-purity ultraviolet-transmitting quartz glass tube 1, and fix the two ends of nickel wire 2 to two winding posts 4 respectively, to obtain the high-power pulsed ultraviolet xenon lamp.

[0052] The high-power pulsed ultraviolet xenon lamp in this embodiment, after repeated verification, can operate normally for more than 19 million cycles on a pulse drive power supply with a maximum input power of 2000W, and the instantaneous ultraviolet intensity at a distance of 1 meter exceeds 400,000 μW / cm². 2 It operates stably with zero explosions, and its ultraviolet intensity decays slowly, decreasing by approximately 39% after 19 million cycles, while still retaining 60% of the ultraviolet intensity of a new lamp. Simultaneously, its full-spectrum transmittance and pulsed output mode enhance safety during use, avoiding the ultraviolet damage and accidental injuries caused by the limited visible light emitted by traditional mercury lamps.

[0053] It should be noted that all features disclosed in this specification, or all steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0054] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents.

Claims

1. A high-power pulsed ultraviolet xenon lamp, characterized in that: The device includes a high-purity violet-transparent quartz glass tube (1) and two electrode assemblies (5) respectively sealed at both ends of the high-purity violet-transparent quartz glass tube (1) by a sealing structure; the sealing structure includes an inner glass layer (8) molten and coated on the outside of the electrode assembly (5) and an outer glass layer (3) molten and coated on the outside of the inner glass layer (8); the outer glass layer (3) is sealed to the high-purity violet-transparent quartz glass tube (1); the high-purity violet-transparent quartz glass tube (1) is filled with a mixed gas; The electrode assembly (5) includes a discharge rod (6), a connecting rod (9) connected to the discharge rod (6), and an electrode (7) connected to the connecting rod (9); the diameter of the connecting rod (9) is 40-50% of the diameter of the discharge rod (6) and the electrode (7); the inner glass layer is fused and coated on the outside of the connecting rod (9) near the electrode (7); the discharge rod (6) and the connecting rod (9) are located inside the high-purity ultraviolet-transparent quartz glass tube (1); and the electrode (7) is located on the outside of the high-purity ultraviolet-transparent quartz glass tube (1). The inner glass layer (8) comprises SiO2, B2O3, and Al2O3, with a ratio of 85:3:12; the outer glass layer (3) comprises SiO2, B2O3, and Al2O3, with a ratio of 79:10:

11. The high-purity violet-transparent quartz glass tube (1) has winding posts (4) on the outer sides of its two ends. Nickel wire (2) is evenly wound around the outer side of the high-purity violet-transparent quartz glass tube (1). The two ends of the nickel wire (2) are fixed on the two winding posts (4). There is a gap of 0.2~0.4mm between the nickel wire (2) and the outer wall of the high-purity violet-transparent quartz glass tube (1). The pressure of the mixed gas is 80~100Pa, and the mixed gas is a mixture of xenon and argon; wherein the ratio of xenon to argon is 9:

1.

2. The high-power pulsed ultraviolet xenon lamp according to claim 1, characterized in that: The discharge electrode rod (6) and the connecting rod (9) are both cerium-tungsten alloy rods, and the electrode (7) is a copper rod.

3. The high-power pulsed ultraviolet xenon lamp according to claim 1, characterized in that: The length of the inner glass layer (8) is less than one-quarter of the length of the connecting rod (9), and the length of the outer glass layer (3) is one-third of the length of the inner glass layer (8).

4. The high-power pulsed ultraviolet xenon lamp according to claim 1, characterized in that: The thickness of the inner glass layer (8) and the outer glass layer (3) is 30% to 50% of the thickness of the high-purity ultraviolet quartz glass tube (1).

5. A manufacturing process for a high-power pulsed ultraviolet xenon lamp according to any one of claims 1 to 4: characterized in that, Includes the following steps: Step 1: Take a high-purity ultraviolet quartz glass tube (1) with a diameter of 8~12mm, a wall thickness of 1~1.5mm, and a length of 350~400mm. Step 2: Take two electrode assemblies (5), and use an oxyhydrogen flame to melt and closely coat a layer of glass inner layer (8) on the outside of the connecting rod (9) of the electrode assembly (5) near the electrode (7). During the coating process, argon gas is introduced into the connecting rod (9). After the glass inner layer (8) cools down, use an oxyhydrogen flame to melt and closely coat a layer of glass outer layer (3) on the outside of the glass inner layer (8) near the electrode (7). The maximum coating length shall not exceed one-quarter of the length of the connecting rod (9). Step 3: Insert the discharge rod (6) and connecting rod (9) of one of the electrode components (5) into one end of the high-purity ultraviolet quartz glass tube (1), with the electrode (7) outside the sealing interface, and then use high-purity quartz to seal the outer glass layer (3) with the high-purity ultraviolet quartz glass tube (1) at high temperature. Step 4: Insert the discharge rod (6) and connecting rod (9) of another electrode assembly (5) from the other end of the high-purity ultraviolet quartz glass tube (1), and fill the high-purity ultraviolet quartz glass tube (1) with mixed gas from this end. The electrode (7) is outside the sealing interface. High-purity quartz is used to seal the glass outer layer (3) of the electrode assembly (5) with the high-purity ultraviolet quartz glass tube (1) at high temperature. Step 5: Weld a winding column (4) to each end of the high-purity ultraviolet quartz glass tube (1); Step 6: Evenly wind nickel wire (2) around the outside of a high-purity ultraviolet-transparent quartz glass tube (1), and fix the two ends of the nickel wire (2) to two winding columns (4) respectively to obtain a high-power pulsed ultraviolet xenon lamp.

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