Air purifiers

Abstract

To provide an air cleaner that uses a high-pressure mercury lamp, in which instable emission of light due to supercooling is prevented.SOLUTION: An air cleaner 10 has a high-pressure mercury lamp 31 having housings 316, 317 that house electrodes 314, 315, an air blower 40 for blowing airflow f toward the high-pressure mercury lamp 31, and walls (lamp holders 32, 33) that are disposed in at least one of upstream and downstream sides of the housings 316, 317 in the flow direction of the airflow f and cover the housings 316, 317.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an air purifier equipped with a high-pressure mercury lamp. [Background technology]

[0002] 2. Description of the Related Art Conventionally, among optical air purifiers, air purifiers that employ ultraviolet lamps are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 61-279248 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the use of high-pressure mercury lamps as the light source for air purifiers has been considered. High-pressure mercury lamps have a higher output than other light sources, and can purify the air in a short time. On the other hand, high-pressure mercury lamps require forced cooling because they become hot during use. For example, when forced cooling is performed using air, the high-pressure mercury lamp becomes overcooled, causing the light emission to become unstable, and there is a risk that the desired sterilization performance cannot be achieved.

[0005] Therefore, an object of the present invention is to suppress destabilization of light emission caused by supercooling in an air purifier using a high-pressure mercury lamp. [Means for solving the problem]

[0006] An air purifier according to one aspect of the present invention comprises a high-pressure mercury lamp having a storage section that houses electrodes, a blower that blows air toward the high-pressure mercury lamp, and a wall section that covers the storage section and is arranged on at least one of the upstream and downstream sides of the storage section in the direction of the airflow. Effect of the Invention

[0007] The air purifier according to the present invention can suppress overcooling of the high-pressure mercury lamp and suppress destabilization of light emission. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram showing the appearance of an air purifier according to an embodiment. [Diagram 2] 1 is a schematic cross-sectional view showing an internal structure of an air purifier according to an embodiment. [Diagram 3] FIG. 2 is a schematic cross-sectional view showing a schematic configuration of an ultraviolet irradiating unit. [Figure 4] 10 is a schematic cross-sectional view showing a schematic configuration of an ultraviolet irradiating section in an air purifier according to Modification 1. FIG. [Diagram 5] 11 is a schematic cross-sectional view showing a wall portion separate from the lamp holder in an air purifier according to Modification 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an air purifier according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is a comprehensive or specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiment are examples and are not intended to limit the present invention. Furthermore, each figure in the attached drawings is a schematic diagram and is not necessarily a strict illustration. Furthermore, in each figure, the same or similar components are given the same reference numerals.

[0010] In the following description and drawings, the width direction of the air purifier 10 and the axial direction (longitudinal direction) of the high-pressure mercury lamp 31 provided in the air purifier 10 are defined as the X-axis direction. The depth direction of the air purifier 10 is defined as the Y-axis direction. The height direction of the air purifier 10 is defined as the Z-axis direction. The X-axis direction, Y-axis direction, and Z-axis direction intersect with each other (orthogonal in this embodiment). For this reason, the XY plane is parallel to the horizontal plane. In the following description, for example, the positive X-axis direction indicates the side of the X-axis arrow (one side), and the negative X-axis direction indicates the opposite side to the positive X-axis direction (the other side). The same applies to the Y-axis direction and the Z-axis direction.

[0011] Furthermore, expressions indicating relative directions or attitudes, such as "parallel" and "orthogonal," also include cases where the directions or attitudes are not strictly those. For example, "two directions are parallel" does not only mean that the two directions are completely parallel, but also means that the two directions are substantially parallel, that is, that there is a difference of, for example, about a few percent.

[0012] (Embodiment) [Air purifier] First, the configuration of an air purifier 10 according to the present embodiment will be described. Fig. 1 is an explanatory diagram showing the external appearance of the air purifier 10 according to the embodiment, and Fig. 2 is a schematic cross-sectional view showing the internal structure of the air purifier 10 according to the embodiment. Specifically, Fig. 1(a) is a front view of the air purifier 10, and Fig. 2(a) is a schematic cross-sectional view corresponding to Fig. 1(a). Fig. 1(b) is a side view of the air purifier 10, and Fig. 2(b) is a schematic cross-sectional view corresponding to Fig. 1(b).

[0013] As shown in FIGS. 1 and 2, the air purifier 10 includes a housing 20, an ultraviolet ray irradiation section 30, a blower section 40, and a power supply circuit section 50.

[0014] The housing 20 is a rectangular box-shaped case that houses the ultraviolet ray irradiation unit 30, the blower unit 40, and the power supply circuit unit 50. A plurality of casters 21 are provided on the bottom of the housing 20, and the casters 21 allow the housing 20 to move freely on the floor surface. In the housing 20, a pair of side walls 22, 23 facing each other in the X-axis direction are provided with an intake port 24 for taking in outside air and an exhaust port 25 for exhausting purified air. In the housing 20, the blower unit 40 is disposed near the intake port 24. When the blower unit 40 is driven, an air flow f is generated in the housing 20, which takes in outside air from the intake port 24 into the housing 20 and exhausts it from the exhaust port 25. In addition, the power supply circuit unit 50 is disposed at the bottom inside the housing 20. The power supply circuit unit 50 is a power supply unit that supplies power to the blower unit 40 and the high-pressure mercury lamp 31 (described later).

[0015] The ultraviolet ray irradiation unit 30 is a unit that purifies the air taken into the housing 20 by irradiating the air with ultraviolet rays. Specifically, the ultraviolet ray irradiation unit 30 reduces or inactivates viruses, bacteria, and the like present in the air by irradiating light including a wavelength band of 200 nm to 280 nm (UV-C).

[0016] 3 is a schematic cross-sectional view showing a schematic configuration of an ultraviolet ray irradiation unit 30 according to an embodiment. As shown in FIG. 3, the ultraviolet ray irradiation unit 30 includes a high-pressure mercury lamp 31, a pair of lamp holders 32 and 33, and a duct unit .

[0017] The high pressure mercury lamp 31 is a lamp that uses light emission by discharge in mercury vapor pressure of 1 atmosphere or more, and emits light including the above-mentioned 200 nm to 280 nm wavelength band (UV-C). The high pressure mercury lamp 31 includes a long arc tube 311, a pair of electrodes 314, 315 housed in the arc tube 311, and a pair of bases 312, 313 provided at both ends of the arc tube 311. Electrode terminals electrically connected to the electrodes 314, 315 protrude from each of the bases 312, 313. Note that each of the bases 312, 313 may be provided with a lead wire electrically connected to the electrodes 314, 315.

[0018] The arc tube 311 has both ends which are smaller in diameter than the center, and the electrodes 314, 315 are housed in the smaller-diameter portions at both ends. Thus, both ends of the arc tube 311 are housing portions 316, 317 which house the electrodes 314, 315. The portion of the arc tube 311 between the housing portions 316, 317 is a straight tube portion. The bases 312, 313 may have a structure in which an electrode terminal is provided at the tip portion, or a structure in which a lead wire is drawn out to the outside. The high-pressure mercury lamp 31 is housed in the duct portion 34, and is disposed so that its axial direction is along the X-axis direction.

[0019] The pair of lamp holders 32, 33 are mechanically connected to the bases 312, 313 of the high pressure mercury lamp 31 to hold the high pressure mercury lamp 31 in a predetermined position. The pair of lamp holders 32, 33 are electrically connected to the power supply circuit unit 50 and supply power to electrode terminals provided on the bases 312, 313 of the high pressure mercury lamp 31. Each lamp holder 32, 33 is formed in a substantially cylindrical shape, and the tip end of each base 312, 313 is attached therein. Therefore, the base end of each base 312, 313 is exposed from each lamp holder 32, 33. Since the outer diameter of each lamp holder 32, 33 is larger than the outer diameter of each housing portion 316, 317, when viewed in the axial direction of the high pressure mercury lamp 31 (when viewed in the X-axis direction), each housing portion 316, 317 is accommodated in each lamp holder 32. In other words, the lamp holders 32, 33 cover the receiving portions 316, 317, respectively, when viewed in the X-axis direction.

[0020] The duct portion 34 is housed in the housing 20 and is a portion that forms an air flow path from the intake port 24 to the exhaust port 25. The duct portion 34 is disposed in the housing 20 with its axis parallel to the X-axis direction. As a result, the flow direction of the airflow f flowing in the duct portion 34 is along the X-axis direction. The high-pressure mercury lamp 31 is disposed in the duct portion 34. The high-pressure mercury lamp 31 is disposed with its axis approximately coaxial with the axis of the duct portion 34. In other words, the high-pressure mercury lamp 31 is disposed with its axis aligned with the flow direction of the airflow f. As a result, the airflow f flows smoothly through the arc tube 311 of the high-pressure mercury lamp 31.

[0021] Furthermore, if the high pressure mercury lamp 31 is tilted with respect to the horizontal plane, the mercury vapor in the arc tube 311 will be biased toward the lower housing section. This bias is undesirable in terms of achieving stable light emission performance. In this embodiment, the high pressure mercury lamp 31 is disposed so that its axial direction is along the flow direction of the air current f, that is, the X-axis direction. Since the X-axis direction is parallel to the horizontal plane, the high pressure mercury lamp 31 is disposed in a position that is not tilted with respect to the horizontal plane. This makes it difficult for the mercury vapor in the arc tube 311 to be biased, and stable light emission performance can be achieved.

[0022] The duct portion 34 includes a first tube portion 341 and a pair of second tube portions 342, 343. The first tube portion 341 is a portion formed in a substantially cylindrical shape, and surrounds the entire circumference of the arc tube 311 of the high pressure mercury lamp 31 when viewed in the X-axis direction. The second tube portions 342, 343 are provided continuously to both ends of the first tube portion 341, respectively.

[0023] The second tube section 342 is a frustum-shaped cylindrical section that continues to the end of the first tube section 341 on the upstream side of the airflow f. The area between the second tube section 342 and the air intake port 24 is also surrounded by a wall body 28, and a flow path for the airflow f is formed (see FIG. 2). The blower section 40 is disposed within this wall body 28. Also, the lamp holder 32 and a housing section 316 for the arc tube 311 of the high-pressure mercury lamp 31 connected to the lamp holder 32 are disposed within the second tube section 342.

[0024] The inner surface of the second pipe section 342 is a tapered surface 342a that gradually narrows toward the first pipe section 341. That is, in the second pipe section 342, the internal dimension of the upstream end is the largest, and the internal dimension of the downstream end is the smallest. Since the downstream end of the second pipe section 342 is continuous with the first pipe section 341, the internal dimension of the downstream end is equal to the internal dimension of the first pipe section 341. In this manner, the internal dimension of the first pipe section 341 is smaller than the maximum internal dimension of the second pipe section 342. Moreover, the internal dimension of the first pipe section 341 is equal to or smaller than the minimum internal dimension of the second pipe section 342.

[0025] The second tube section 343 is a frustum-shaped cylindrical section that continues to the end of the first tube section 341 on the downstream side of the airflow f. The area between the second tube section 343 and the exhaust port 25 is also surrounded by a wall body 29, forming a flow path for the airflow f (see FIG. 2). The power supply circuit section 50 is disposed below this wall body 29. Also, within the second tube section 343, a lamp holder 33 and a housing section 317 for the arc tube 311 of the high-pressure mercury lamp 31 connected to the lamp holder 33 are disposed.

[0026] The inner surface of the second pipe section 343 is a tapered surface 343a that gradually narrows toward the first pipe section 341. That is, in the second pipe section 343, the inner dimension of the downstream end is the largest, and the inner dimension of the upstream end is the smallest. Since the upstream end of the second pipe section 343 is continuous with the first pipe section 341, the inner dimension of the upstream end is equal to the inner dimension of the first pipe section 341. In this manner, the inner dimension of the first pipe section 341 is smaller than the maximum inner dimension of the second pipe section 343. Moreover, the inner dimension of the first pipe section 341 is equal to or smaller than the minimum inner dimension of the second pipe section 343.

[0027] [Air flow] Next, a description will be given of the flow of airflow f in the duct portion 34 that is generated by driving the blower portion 40. The airflow f is the flow of air from the intake port 24 to the exhaust port 25 in the housing 20. Specifically, it is the flow of air that enters from the intake port 24, passes through the wall 28, the duct portion 34, and the wall 29, and is exhausted from the exhaust port 25.

[0028] The airflow f that has passed through the wall body 28 passes through the second tube section 342 on the upstream side of the duct section 34. At this time, the airflow f is introduced into the first tube section 341 and guided to the light emitting tube 311 of the high-pressure mercury lamp 31 while its flow speed is gradually increased by the tapered surface 342a of the second tube section 342. As a result, the airflow f, whose flow speed has increased within the first tube section 341, effectively cools the portion of the light emitting tube 311 between the housing sections 316, 317. This makes it possible to control the mercury vapor pressure within the light emitting tube 311 and to protect the light emitting tube 311.

[0029] Here, the upstream lamp holder 32 is disposed at a position upstream of the accommodation portion 316 and covers the accommodation portion 316 when viewed in the X-axis direction. Therefore, the lamp holder 32 blocks the airflow f toward the accommodation portion 316 and causes the airflow f to stagnate in the vicinity of the accommodation portion 316. This stagnation suppresses the cooling effect on the accommodation portion 316. This makes it possible to suppress a decrease in temperature of the electrode 314 in the accommodation portion 316 and stabilize the emission of thermoelectrons.

[0030] Furthermore, the airflow f having passed through the first pipe section 341 passes through the downstream second pipe section 343. At this time, the airflow f is introduced into the wall body 29 while the flow velocity is gradually weakened by the tapered surface 343a of the second pipe section 343, and is finally exhausted from the exhaust port 25 to the outside of the housing 20.

[0031] Here, the downstream lamp holder 33 is disposed at a position downstream of the accommodation portion 317 and covers the accommodation portion 317 as viewed in the X-axis direction. The lamp holder 33 turns the airflow f into a turbulent flow and blocks the airflow f from passing smoothly through the accommodation portion 317. In particular, in the lamp holder 33, the flow speed of the airflow f is weakened by the tapered surface 343a of the second tube portion 343, so that the turbulence generation effect is also high. As a result, the airflow f stagnates near the accommodation portion 317, and the cooling effect for the accommodation portion 317 is suppressed. As a result, the temperature drop of the electrode 315 in the accommodation portion 317 can be suppressed, and the emission of thermoelectrons can be stabilized.

[0032] [Effects, etc.] As described above, the air purifier 10 of this embodiment comprises a high-pressure mercury lamp 31 having storage sections 316, 317 that house electrodes 314, 315, a blower section 40 that blows airflow f toward the high-pressure mercury lamp 31, and wall sections (lamp holders 32, 33) that are arranged upstream and downstream of the storage sections 316, 317 in the flow direction of the airflow f and cover the storage sections 316, 317.

[0033] According to this, the walls (lamp holders 32, 33) for stagnating the airflow f are provided on the upstream side of the housing portion 316 and the downstream side of the housing portion 317, respectively, thereby making it possible to suppress the cooling of each of the housing portions 316, 317. Therefore, the temperature drop of the electrodes 314, 315 in each of the housing portions 316, 317 is suppressed, and the emission of thermoelectrons can be stabilized. In this way, it is possible to suppress overcooling of the high-pressure mercury lamp 31 and to suppress destabilization of light emission.

[0034] The wall portion is also provided with lamp holders 32 and 33 which hold a high pressure mercury lamp 31 .

[0035] According to this, the lamp holders 32, 33 can stagnate the airflow f near the housing portions 316, 317, so that the high pressure mercury lamp 31 can be prevented from being overcooled without providing a separate dedicated wall portion.

[0036] Moreover, the high pressure mercury lamp 31 is disposed so that the axial direction of the high pressure mercury lamp 31 is aligned with the flow direction of the air current f.

[0037] According to this, the high pressure mercury lamp 31 is arranged so that its axial direction is aligned with the flow direction of the air current f, so that the air current f can be made to flow smoothly around the arc tube 311 of the high pressure mercury lamp 31. Therefore, the cooling performance of the portion of the arc tube 311 between the containers 316, 317 can be improved.

[0038] Moreover, the high pressure mercury lamp 31 is disposed so that the axial direction of the high pressure mercury lamp 31 is aligned along a horizontal plane.

[0039] This ensures that the high pressure mercury lamp 31 is not tilted relative to the horizontal plane, which makes it difficult for the mercury in the arc tube 311 of the high pressure mercury lamp 31 to become unevenly distributed, allowing the lamp 31 to exhibit stable light emission performance.

[0040] The air purifier 10 also has a duct section 34 surrounding the high-pressure mercury lamp 31 and the wall section. The duct section 34 includes a first tube section 341 surrounding the high-pressure mercury lamp 31, and second tube sections 342 and 343 continuing to the upstream and downstream ends of the first tube section 341 in the flow direction. The internal dimension of the first tube section 341 is smaller than the maximum internal dimension of the second tube sections 342 and 343.

[0041] According to this, since the internal dimension of the first tube portion 341 is smaller than the maximum internal dimension of the second tube portions 342, 343, the flow velocity of the airflow f in the first tube portion 341 can be made faster than that in the second tube portions 342, 343. Therefore, the arc tube 311 of the high-pressure mercury lamp 31 arranged in the first tube portion 341 can be efficiently cooled while preventing the respective accommodation portions 316, 317 from being overcooled.

[0042] Further, the second pipe portions 342 and 343 have tapered surfaces 342 a and 343 a that gradually narrow toward the first pipe portion 341 .

[0043] According to this, the airflow f can be smoothly guided to the arc tube 311 of the high pressure mercury lamp 31 by the tapered surfaces 342a, 343a of the second tube portions 342, 343. This allows the arc tube 311 to be cooled more efficiently.

[0044] [Variation 1] Next, a first modified example of the air purifier will be described. In the following description, the same parts as those in the air purifier 10 according to the above embodiment will be denoted by the same reference numerals, and the description thereof may be omitted.

[0045] Fig. 4 is a schematic cross-sectional view showing a schematic configuration of an ultraviolet ray irradiation unit 30A in an air purifier according to Modification 1. Specifically, Fig. 4 is a view corresponding to Fig. 3. As shown in Fig. 4, Modification 1 differs from the above embodiment in that the ultraviolet ray irradiation unit 30A has a pair of rectifying covers 35, 36.

[0046] Specifically, the rectifying cover 35 is disposed immediately upstream of the lamp holder 32. The rectifying cover 35 is formed in a shape that tapers away from the lamp holder 32. The rectifying cover 35 is disposed so as to cover the lamp holder 32 when viewed in the X-axis direction. The rectifying cover 35 straightens the airflow f before it reaches the lamp holder 32. As described above, the rectifying cover 35 is formed in a shape that tapers away from the lamp holder 32, and therefore has a high rectifying effect. This allows the airflow f to flow smoothly before it reaches the lamp holder 32, and therefore the overall flow inside the duct portion 34 can be stabilized.

[0047] On the other hand, the rectifying cover 36 is disposed immediately downstream of the lamp holder 33. The rectifying cover 36 is formed in a shape that tapers away from the lamp holder 33. The rectifying cover 36 is disposed so as to cover the lamp holder 33 when viewed in the X-axis direction. The rectifying cover 36 straightens the flow of the airflow f after it passes through the lamp holder 33. As described above, the rectifying cover 36 is formed in a shape that tapers away from the lamp holder 33, so that it has a high rectifying effect. As a result, the airflow f flows smoothly after it passes through the lamp holder 33, and the overall flow inside the duct portion 34 can be stabilized.

[0048] The shapes of the rectifying covers 35 and 36 may be any as long as they can regulate the airflow f. In addition, in the first modification, the lamp holders 32 and 33 are provided with the rectifying covers 35 and 36, respectively, but the rectifying cover may be provided only on one of the lamp holders 32 and 33.

[0049] [Variation 2] Next, a description will be given of modified air purifier 2. In the following description, the same parts as those in air purifier 10 according to the above embodiment will be given the same reference numerals, and the description thereof may be omitted.

[0050] FIG. 5 is a schematic cross-sectional view showing the wall parts 37, 38 separate from the lamp holders 32, 33 in the air purifier according to the second modification. As shown in FIG. 5, in the second modification, the flow direction of the air flow f1 is along the Z-axis direction. The wall part 37 is formed in a cylindrical shape and is arranged at a position surrounding the lamp holder 32 and the housing part 316 on one side. The wall part 38 is formed in a cylindrical shape and is arranged at a position surrounding the lamp holder 33 and the housing part 317 on the other side. The wall parts 37, 38 expose the arc tube 311 of the high-pressure mercury lamp 31. Even in this case, the wall parts 37, 38 block the air flow f1 in the vicinity of the housing parts 316, 317 and cause it to stagnate. This makes it possible to suppress the cooling performance of the housing parts 316, 317. Therefore, it is possible to suppress the overcooling of the high-pressure mercury lamp 31 and to suppress the instability of the light emission.

[0051] In the second modification, the cylindrical walls 37 and 38 are exemplified, but any shape may be used as long as the airflow f1 is stagnated in the vicinity of the storage sections 316 and 317. For example, the walls may be flat or curved plates arranged on at least one of the upstream and downstream sides of the airflow f1 in each of the storage sections 316 and 317.

[0052] (others) Although the air purifier 10 according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. In other words, the embodiment disclosed here is illustrative in all respects and is not restrictive, and the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the claims.

[0053] For example, in the above embodiment, a case has been exemplified in which the wall portions (lamp holders 32, 33) for stagnating the airflow f are provided on both the upstream side of the storage portion 316 and the downstream side of the storage portion 317. However, the wall portions may be provided only on either the upstream side of the storage portion 316 or the downstream side of the storage portion 317. Even in this case, a certain degree of cooling suppression effect on the storage portions 316, 317 can be obtained.

[0054] In the above embodiment, the lamp holders 32, 33 are used as the walls. However, a wall dedicated to stagnate the airflow f may be provided near the receiving portions 316, 317.

[0055] In the above embodiment, the high-pressure mercury lamp 31 is disposed with its axial direction aligned with the flow direction of the air current f, but the axial direction does not have to be aligned with the flow direction of the air current f.

[0056] In the above embodiment, the high pressure mercury lamp 31 is disposed with its axial direction aligned along a horizontal plane, but the axial direction does not have to be aligned along a horizontal plane.

[0057] In the above embodiment, the duct portion 34 having the first tube portion 341 and the second tube portions 342 and 343 is exemplified, but the duct portion may have any shape as long as it surrounds the high pressure mercury lamp 31 and the wall portion.

[0058] Any combination of the above-described embodiments and their modifications is also included within the scope of the present invention. [Explanation of symbols]

[0059] 10. Air Purifier 20. Cabinet 21 Caster 22, 23 Side wall 24 Air Intake 25 Exhaust port 28, 29 Wall 30, 30A UV irradiation section 31 High pressure mercury lamp 32, 33 Lamp holder (wall) 34 Duct section 35, 36 Rectifier cover 37, 38 wall 40 Blower 50 Power supply circuit section 311 Light emitting tube 312, 313 Cap 314, 315 electrode 316, 317 Storage unit 341 First pipe section 342, 343 Second pipe section 342a, 343a Tapered surface

Claims

1. a high pressure mercury lamp having a housing portion housing an electrode; a blower for blowing air toward the high pressure mercury lamp; a wall portion that is disposed on at least one of an upstream side and a downstream side of the storage portion in a flow direction of the airflow and covers the storage portion; a duct portion surrounding the high-pressure mercury lamp and the wall portion, The duct portion includes a first tube portion surrounding the high-pressure mercury lamp; a second pipe portion connected to at least one of an upstream end and a downstream end in the flow direction of the first pipe portion, The first tubular section has an internal dimension that is smaller than the maximum internal dimension of the second tubular section. Air purifier.

2. A high pressure mercury lamp having a housing portion that houses an electrode; a blower for blowing air toward the high pressure mercury lamp; a wall portion that is disposed on at least one of an upstream side and a downstream side of the storage portion in a flow direction of the airflow and covers the storage portion; a flow straightening cover that is disposed on at least one of the upstream side and the downstream side of the wall portion in the flow direction and covers the wall portion; Air purifier.

3. The wall portion is provided on a lamp holder that holds the high-pressure mercury lamp.

3. The air purifier according to claim 1 or 2.

4. The high-pressure mercury lamp is disposed so that the axial direction of the high-pressure mercury lamp is aligned with the flow direction of the air current. The air purifier according to any one of claims 1 to 3.

5. The high pressure mercury lamp is disposed so that the axial direction of the high pressure mercury lamp is along a horizontal plane.

5. The air purifier according to claim 4.

6. The second pipe portion has a tapered surface that gradually narrows toward the first pipe portion.

2. The air purifier according to claim 1.

7. The flow straightening cover has a shape that tapers away from the wall portion.

3. The air purifier according to claim 2.

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