Filter testing device

Abstract

To provide a filter testing device that can easily perform a test to evaluate filters for pressure fluctuation.SOLUTION: The filter testing device comprises a cylindrical casing 1, a pair of fans 2 disposed in the longitudinal direction of the casing 1 with a space therebetween, and a filter 3 disposed between the pair of fans 2 so as to intersect the longitudinal direction of the casing 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a filter test device.

Background Art

[0002] Patent Document 1 describes a conventional filter test device (a salt damage test device in Patent Document 1). The filter test device includes a duct with a filter unit fixed at an intermediate position in the longitudinal direction, a blower disposed at one end of the duct in the longitudinal direction, and a microspray humidifier that sprays fine liquid particles from the other end of the duct.

[0003] In the filter test device of Patent Document 1, a test of the filter unit can be performed by spraying fine particles containing salt. Therefore, according to the filter test device, the filter can be tested in a short time at an arbitrary location without being affected by the natural environment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the filter test device of Patent Document 1, even if an attempt is made to test the performance of the filter against pressure fluctuations, only pressurization or depressurization of the space on one side of the filter can be performed in the longitudinal direction of the duct. For this reason, the filter test device of Patent Document 1 could not perform a test for evaluating the filter regarding pressure fluctuations.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a filter test device capable of easily performing a test for evaluating a filter regarding pressure fluctuations.

Means for Solving the Problems

[0007] A filter test device according to one aspect of the present invention includes a cylindrical casing, a pair of fans arranged at intervals in the longitudinal direction of the casing, and a filter arranged between the pair of fans so as to intersect the longitudinal direction of the casing.

Advantages of the Invention

[0008] The filter test device according to the above aspect of the present invention has an advantage that a test for evaluating a filter regarding pressure fluctuation can be easily performed.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0010] <Embodiment> Hereinafter, the filter test device 10 according to the present embodiment will be described in detail with reference to the accompanying drawings.

[0011] As shown in FIG. 1, the filter test device 10 according to the present embodiment includes a cylindrical casing 1, a pair of fans 2 arranged at intervals in the longitudinal direction of the casing 1, and a filter 3 arranged between the pair of fans 2. The filter 3 is arranged so as to intersect the longitudinal direction of the casing 1.

[0012] With such a configuration, the filter test apparatus 10 can easily form a differential pressure between the space on one side and the space on the other side with respect to the filter 3, for example, in the longitudinal direction of the casing 1. Therefore, according to the filter test apparatus 10 according to the present embodiment, a test for evaluating the filter 3 regarding pressure fluctuations can be easily performed. Further, since positive and negative pressures can be easily created inside the casing 1, a test of the filter regarding pressure fluctuations can be realized in a short period of time.

[0013] Further, the casing 1 has a dust inlet 13. Therefore, it is also possible to evaluate the filter 3 with respect to pressure fluctuations in a dust environment. Furthermore, as shown in FIG. 5, the filter test apparatus 10 according to the present embodiment includes a canopy portion 4 that maintains the humidity around the casing 1. Therefore, in addition to a dust environment, it is also possible to evaluate the filter 3 with respect to pressure fluctuations in a high-humidity environment. By using the filter test apparatus 10 according to the present embodiment, a test compliant with the dust test of JIS B 9908 can be performed.

[0014] Hereinafter, for convenience of explanation, it will be described assuming that the installation surface G1 of the filter test apparatus 10 is a horizontal plane. Also, the longitudinal direction of the casing 1 is defined as the "length direction", the direction orthogonal to the length direction and parallel to the installation surface G1 is defined as the "width direction", and the direction orthogonal to the length direction and the width direction is defined as the "height direction". However, the installation surface G1 does not necessarily have to be a horizontal plane.

[0015] In addition, in this specification, "parallel" includes not only the case where two straight lines, planes, etc. (hereinafter, straight lines, etc.) do not intersect even when extended, but also the case where the angle formed by two straight lines, etc. intersects within a range of 10° or less. Also, "orthogonal" means the case where two straight lines, etc. intersect within a range of 90° ± 10°. However, even if two straight lines, etc. do not directly intersect, if they intersect when extended, they are included in "orthogonal".

[0016] (Filter test apparatus 10) The filter test device 10 is a device that tests the filter 3 and evaluates the performance of the filter 3. As described above, the filter test device 10 includes a casing 1, a pair of fans 2, a filter 3, a canopy portion 4 (Fig. 5), a pair of rectifying plates 5, and a pair of guard portions (not shown). The filter test device 10 according to the present embodiment can perform tests on the filter 3 regarding pressure fluctuations not only in a normal environment but also in a dust environment and / or a high humidity environment as an evaluation of the filter 3. In the filter test device 10, the components other than the canopy portion 4 may be referred to as the "main body" or the "test device main body".

[0017] The filter test device 10 according to the present embodiment is preferably used as a test device for the filter 3 used in the switchgear. Among the switchgears, there is a special environment switchgear installed in a dust environment and a high humidity environment. In the filter test device 10 according to the present embodiment, it can be used to evaluate and confirm the ventilation performance of this special environment switchgear.

[0018] (Casing 1) The casing 1 constitutes the main body of the filter test device 10. The casing 1 is formed in a cylindrical shape. The casing 1 is preferably in a rectangular tube shape. However, the casing 1 may be in a cylindrical shape. The longitudinal direction of the casing 1 is the length direction of the filter test device 10 and is parallel to the installation surface G1.

[0019] The casing 1 according to the present embodiment has opening surfaces at both end faces in the length direction. The opening surfaces intersect the length direction. One opening surface in the length direction communicates with the other opening surface. As shown in Fig. 1, a flange (hereinafter referred to as the fan mounting flange 111) for mounting the fan 2 is provided around the opening surface.

[0020] The casing 1 includes a pair of first parts 11 having a fan mounting flange 111, and a plurality of second parts 12 arranged between the pair of first parts 11. The first part 11 includes a tapered part 112 formed in a tapered shape such that the cross-sectional area of the flow path decreases from the end on the fan mounting flange 111 side toward the central part in the length direction, and a straight pipe part 113 having the same cross-sectional area of the flow path from the central part to the end of the second part 12. The tapered part 112 and the straight pipe part 113 are integrally formed. The straight pipe part 113 has a flange (hereinafter referred to as the first flange 114) for connecting the second part 12 at the end of the straight pipe part 113.

[0021] The cross-sectional area of the flow path of the second part 12 is the same over the entire length. In the length direction, the end of the second part 12 on the first part 11 side has a flange (hereinafter referred to as the second flange 121) connected to the first flange 114 of the first part 11. Also, in the length direction, the end of the second part 12 on the side opposite to the first part 11 side has a flange (hereinafter referred to as the third flange 122) connected to the adjacent second part 12. The adjacent second parts 12 are connected to each other by the third flange 122.

[0022] The flow path inside the second part 12 and the straight pipe part 113 preferably has a side length (which may be referred to as the "flow path diameter") of, for example, 200 mm or more and 300 mm or less, more preferably 230 mm or more and 280 mm or less, and still more preferably 240 mm or more and 260 mm or less. When the second part 12 and the straight pipe part 113 are cylindrical, its inner diameter (which may be referred to as the "flow path diameter") is preferably, for example, 200 mm or more and 300 mm or less, more preferably 230 mm or more and 280 mm or less, and still more preferably 240 mm or more and 260 mm or less.

[0023] The rectifying plate 5 is preferably disposed between the filter 3 and the fan 2 in the longitudinal direction of the casing 1. The rectifying plate 5 according to this embodiment is installed between the first flange 114 and the second flange 121. Thereby, the air flow passing through the rectifying plate 5 is easily made into a laminar flow. Examples of the rectifying plate 5 include a lattice plate, a punching metal having a plurality of through holes, and a honeycomb plate. The rectifying plate 5 is arranged so as to intersect the length direction. The rectifying plate 5 is preferably larger than the flow path of the casing 1 and is preferably installed so as to partition the flow path of the casing 1.

[0024] The casing 1 preferably has one or more windows 123. In this embodiment, each second portion 12 has one window 123. The window 123 is configured by fitting a transparent plate into an opening formed to penetrate the inside and outside of the second portion 12. Examples of the transparent plate include glass and acrylic resin. Thereby, the state inside the casing 1 can be observed through the window 123. Note that when the casing 1 is made of a transparent material, the window 123 is unnecessary.

[0025] The casing 1 preferably has a dust inlet 13. In this embodiment, the second portion 12 has the dust inlet 13. By putting dust into the casing 1 through the dust inlet 13, the performance of the filter 3 in a dust environment can be evaluated. The dust inlet 13 is a through hole penetrating the second portion 12. For the dust inlet 13, for example, it is preferable to insert the discharge nozzle of an air sampler that discharges dust to perform dust input.

[0026] As shown in FIG. 2, the minimum distance L1 between the dust inlet 13 and the filter 3 is set, for example, to 2.5 times the flow path diameter of the second portion 12. Note that the dust inlet 13 is not limited to being formed in the second portion 12, and may be formed in the first portion 11, for example, or the opening surface at the end of the first portion 11 in the longitudinal direction may be used as the dust inlet 13.

[0027] Further, the casing 1 preferably has a plurality of measurement ports 14. In the present embodiment, the second portion 12 has a plurality of measurement ports 14. The casing 1 includes, as the plurality of measurement ports 14, a pair of differential pressure measurement ports 141 and a plurality of wind speed measurement ports 142. One of the pair of differential pressure measurement ports 141 is disposed on one side of the filter 3 in the longitudinal direction, and the other differential pressure measurement port 141 is disposed on the other side of the filter 3 in the longitudinal direction. By installing a pressure gauge at the differential pressure measurement port 141, the differential pressure between the spaces on both sides of the filter 3 can be measured.

[0028] The minimum distance L2 between the differential pressure measurement port 141 and the filter 3 is set, for example, to 0.5 times the flow path of the second portion 12. Note that the differential pressure measurement port 141 is not limited to being formed in the second portion 12, and may be formed in the first portion 11, for example.

[0029] The wind speed measurement port 142 is a measurement port 14 into which an anemometer is inserted. Half of the plurality (here, 12) of wind speed measurement ports 142 are disposed on one side of the filter 3 in the longitudinal direction, and the other half of the wind speed measurement ports 142 are disposed on the other side of the filter 3 in the longitudinal direction. In the present embodiment, the wind speed measurement port 142 is formed in the second portion 12. The plurality of wind speed measurement ports 142 are arranged at regular intervals in the width direction. The minimum distance L31 between the wind speed measurement port 142 and the filter 3 is set, for example, to 1.0 times the flow path of the second portion 12. Also, the minimum distance L32 between the wind speed measurement ports 142 adjacent to each other in the longitudinal direction is set, similar to L31, to 1.0 times the flow path of the second portion 12, for example. By providing the plurality of wind speed measurement ports 142, the wind speed at each point can be measured, the wind speed distribution can be grasped, and the average value of the wind speed can also be obtained.

[0030] As shown in FIG. 3, the casing 1 is preferably supported by a plurality of casters 7. In the present embodiment, the plurality of casters 7 are attached to the lower surface of the casing 1 and are disposed between the casing 1 and the installation surface G1. Thereby, the movement of the casing 1 is easy.

[0031] The casing 1 with such a configuration is preferably made of metal except for the window 123. However, the casing 1 is not limited to metal and may be composed of, for example, synthetic resin, carbon, rubber, glass, FRP (Fiber Reinforced Plastics), etc., or composite materials thereof.

[0032] (Fan 2) The fan 2 can create an air flow inside the casing 1 and apply pressure fluctuations inside the casing 1. As shown in FIG. 1, each fan 2 is arranged to face the opening surface (the opening surface of the first part 11) at the end in the length direction of the casing 1. The fan 2 is attached to the fan mounting flange 111 of the casing 1.

[0033] The wind direction from the fan 2 can be switched between the direction forming an air flow from the fan 2 toward the filter 3 (hereinafter sometimes referred to as the positive pressure direction) and the direction forming an air flow from the filter 3 toward the fan 2 (hereinafter sometimes referred to as the negative pressure direction). The fan 2 preferably switches between the positive pressure direction and the negative pressure direction by switching the rotation direction between the forward direction and the reverse direction. However, the direction of the fan 2 may be changed by 180° by rotating the mounting frame of the fan 2, thereby switching between the positive pressure direction and the negative pressure direction.

[0034] The filter test device 10 preferably has a guard part (not shown) that covers each fan 2 from the outside. The guard part can reduce the contact of a part of the user's body with the fan 2. The guard part preferably has a structure that does not hinder the movement of air, and examples thereof include a wire mesh, a resin mesh, a louver, a fence, etc.

[0035] (Filter 3) The filter 3 is arranged between a pair of fans 2 in the length direction. The filter 3 is arranged to intersect the length direction and partition the flow path of the casing 1. In the present embodiment, the filter 3 is arranged between the third flanges 122 of the adjacent second parts 12 and is arranged at the central part in the longitudinal direction of the casing 1.

[0036] As shown in FIG. 4, the filter 3 is sandwiched and attached by using a plurality of fixtures 31 to bring adjacent third flanges 122 closer to each other while being disposed between the third flanges 122. The filter 3 is fixed to, for example, a frame body (not shown) that fixes the outer peripheral portion of the filter 3, and the frame body is attached by being sandwiched between adjacent third flanges 122. The frame body to which the filter 3 is attached can be removed from the casing 1. Further, the filter 3 can be removed from the frame body. Examples of the fixture 31 include a snap lock, a bolt and nut, and a screw. In the present embodiment, a snap lock is used as the fixture 31, and the filter 3 can be easily removed from the third flange 122.

[0037] It is preferable that a packing is disposed between the frame body and the third flange 122. Thereby, in a state where the filter 3 is disposed so as to partition the flow path, leakage of gas from between the flow path and the frame body can be reduced. Therefore, the pressure fluctuation test in the casing 1 can be accurately performed.

[0038] (Canopy part 4) The canopy part 4 maintains the humidity around the casing 1. As shown in FIG. 5, the canopy part 4 includes a frame 41 and a sheet 42 supported by the frame 41. The sheet 42 is preferably a sheet that is difficult to transmit moisture, and examples thereof include a vinyl sheet and a waterproof fabric.

[0039] The canopy part 4 covers the outside in the length direction, the outside in the width direction, and the upper direction of the casing 1. That is, the canopy part 4 covers the periphery of the test apparatus main body. Further, a humidifier is installed in the canopy part 4. By operating the humidifier, the periphery of the casing 1 can be maintained in a high humidity environment. The humidity around the casing 1 is set to, for example, a relative humidity of 90% or more.

[0040] <Usage example> The filter test device 10 according to this embodiment is used, for example, as follows. However, the following usage example is merely an example and is not intended to specify the usage method of the filter test device 10.

[0041] (First usage example) As a first usage example, an example of using the filter test device 10 according to this embodiment in a test for evaluating the air volume-static pressure characteristics (P-Q characteristics) in a high-humidity environment will be described.

[0042] First, in the canopy part 4, operate the humidifier for about 30 minutes to make the relative humidity 90% or more. After that, it is preferable to set the humidifier so that the relative humidity of 90% or more can be maintained.

[0043] Next, drive the fan 2 and operate it until the rotation speed of the fan 2 stabilizes (for example, about 1 minute). After the rotation speed of the fan 2 stabilizes, insert an anemometer into the wind speed measurement port 142 to measure the wind speed inside the casing 1. The wind speed is measured in the spaces on both sides of the filter 3 in the length direction. Also, insert a pressure gauge into the differential pressure measurement port 141 to measure the differential pressure in the spaces on both sides of the filter 3 in the length direction.

[0044] Change the rotation speed of the fan 2 and measure the wind speed and differential pressure at a plurality of rotation speeds. Thereby, the filter 3 can be evaluated with respect to the pressure fluctuation in a high-humidity environment.

[0045] (Second usage example) As a second usage example, an example of using the filter test device 10 according to this embodiment in a test for evaluating the air volume-static pressure characteristics (P-Q characteristics) in an environment with a specific amount of dust and in a high-humidity environment will be described.

[0046] First, in the canopy part 4, operate the humidifier for about 30 minutes to make the relative humidity 90% or more. After that, it is preferable to set the humidifier so that the relative humidity of 90% or more can be maintained.

[0047] Next, drive the fan 2 and operate it until the rotational speed of the fan 2 stabilizes (for example, about 1 minute). After the rotational speed of the fan 2 has stabilized, introduce a predetermined amount of dust from the dust inlet 13. Also, insert an anemometer into the wind speed measurement port 142 to measure the wind speed inside the casing 1. The wind speed is measured in the spaces on both sides of the filter 3 in the longitudinal direction. Also, insert a pressure gauge into the differential pressure measurement port 141 to measure the differential pressure in the spaces on both sides of the filter 3 in the longitudinal direction.

[0048] Change the rotational speed of the fan 2 and measure the wind speed and differential pressure at a plurality of rotational speeds. Thereby, the filter 3 can be evaluated for pressure fluctuations in a dust environment and a high humidity environment.

[0049] <Modification Example> The above-described embodiment is merely one of various embodiments of the present invention. The embodiment can be variously modified according to the design and the like as long as the object of the present invention can be achieved. Hereinafter, modification examples of the embodiment will be listed. The modification examples described below can be applied in appropriate combinations.

[0050] The casing 1 according to the above-described embodiment had open surfaces at both end faces in the longitudinal direction. However, for example, at the end of the casing 1 in the longitudinal direction, it may have an open surface that opens in the width direction or the height direction. The fan 2 may be provided on the open surface.

[0051] The filter test apparatus 10 according to the above-described embodiment includes the canopy portion 4 in order to create a high humidity environment. However, if it is not necessary to conduct a test in a high humidity environment, the canopy portion 4 may be omitted.

[0052] In the above usage example, an example used in an experiment for evaluating the air volume-static pressure characteristics in a high humidity environment and the air volume-static pressure characteristics in an environment with a specific amount of dust and in a high humidity environment was described. However, it may also be used for evaluating the filter 3 for pressure fluctuations in a normal environment.

[0053] The casing 1 according to the above-described embodiment includes two second portions 12, but it may include three or more second portions 12.

[0054] The casing 1 according to the above embodiment includes the first portion 11 having the tapered portion 112, but the tapered portion 112 is not necessarily required, and the first portion 11 may be a straight pipe portion 113 over the entire length.

[0055] <Summary> As described above, the filter test apparatus 10 according to the first aspect includes the cylindrical casing 1, a pair of fans 2 arranged at intervals in the longitudinal direction of the casing 1, and a filter 3 arranged between the pair of fans 2 so as to intersect the longitudinal direction of the casing 1.

[0056] According to this aspect, the filter test apparatus 10 can easily form a differential pressure between the space on one side and the space on the other side with respect to the filter 3, for example, in the longitudinal direction of the casing 1. Therefore, according to the filter test apparatus 10 according to the present embodiment, a test for evaluating the filter 3 regarding pressure fluctuations can be easily performed.

[0057] In the filter test apparatus 10 according to the second aspect, in the first aspect, each of the pair of fans 2 is configured to be switchable between a direction for forming an air flow from the fan 2 toward the filter 3 and a direction for forming an air flow from the filter 3 toward the fan 2. According to this aspect, it is possible to easily set the space on one side and the space on the other side with respect to the filter 3 in the longitudinal direction of the casing 1 to a positive pressure or / and a negative pressure.

[0058] In the filter test apparatus 10 according to the third aspect, in the first or second aspect, a pair of rectifying plates 5 arranged between the filter 3 and each of the pair of fans 2 in the longitudinal direction of the casing 1 is further provided. According to this aspect, it is easy to make the air flow in the casing 1 created by the fan 2 into a laminar flow.

[0059] In the filter test apparatus 10 according to the fourth aspect, in any one of the first to third aspects, each of the pair of fans 2 is disposed at both longitudinal ends of the casing 1, and the filter 3 is disposed at the longitudinal center of the casing 1. According to this aspect, the distance between one fan 2 and the filter 3 and the distance between the other fan 2 and the filter 3 can be made the same.

[0060] In the filter test apparatus 10 according to the fifth aspect, in any one of the first to fourth aspects, the filter 3 is attached to a frame body, and the frame body is detachably attached to the casing 1. According to this aspect, the filter 3 can be easily replaced, and it is easy to test various filters 3.

[0061] In the filter test apparatus 10 according to the sixth aspect, in any one of the first to fifth aspects, the casing 1 has a dust inlet 13 formed between the filter 3 and at least one of the pair of fans 2 in the longitudinal direction of the casing 1. According to this aspect, in a dust environment, the filter 3 can be evaluated regarding pressure fluctuations.

[0062] In the filter test apparatus 10 according to the seventh aspect, in any one of the first to sixth aspects, it further includes a canopy portion 4 that surrounds the casing 1 and maintains the humidity around the casing 1. According to this aspect, in a high humidity environment, the filter 3 can be evaluated regarding pressure fluctuations.

Explanation of Reference Numerals

[0063] 10 Filter test apparatus 1 Casing 11 First part 13 Dust inlet 14 Measurement port 141 Differential pressure measurement port 142 Wind speed measurement port 2 Fan 3 Filter 4 Canopy portion 5 Rectifying plate

Claims

1. A cylindrical casing, A pair of fans arranged at intervals in the longitudinal direction of the casing, A filter arranged between the pair of fans so as to intersect the longitudinal direction of the casing, Comprising, A filter test device.

2. Each of the pair of fans is configured to be switchable between a direction forming an air flow from the fan toward the filter and a direction forming an air flow from the filter toward the fan, The filter test device according to Claim 1.

3. Further comprising a pair of rectifying plates arranged between the filter and each of the pair of fans in the longitudinal direction of the casing, The filter test device according to Claim 1.

4. Each of the pair of fans is arranged at both ends in the longitudinal direction of the casing, The filter is arranged at the central part in the longitudinal direction of the casing, The filter test device according to Claim 1.

5. The filter is attached to a frame body, The frame body is detachably attached to the casing, The filter test device according to Claim 1.

6. The casing has a dust inlet formed between the filter and at least one of the pair of fans in the longitudinal direction of the casing, The filter test device according to Claim 1.

7. Further comprising a canopy part surrounding the casing and maintaining the humidity around the casing, The filter test device according to any one of Claims 1 to 6.

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