Filter for blower

Abstract

To provide a filter for a blower which can be attached to different-sized blowers without damaging the appearance, does not affect air permeability, and is not bulky.SOLUTION: A filter 10 for a blower is a bag-like body formed by a knit fabric having stretchability and has an opening 12 and a body part 11. An expansion recovery rate of the opening 12 is set higher than an expansion recovery rate of the body part 11. The opening 12 is expanded and a back side fan guard G of a blower B is housed into the body part 11 through the opening 12. Further, recovery of the opening 12 causes the filter to be adhered and attached to an outer surface of the back side fan guard G. Since the filter does not use an adhesive etc. and is attached to or detached from the blower B by utilizing stretching force of the knit fabric itself, the adhesive does not cause adhesive deposit on the blower B and affect air permeability. The filter is adhered to the fan guard G compactly and thus is not bulky and does not damage the appearance of the blower B. The form does not need a space during storage and transportation.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a blower filter attached to a blower. Specifically, the present invention relates to a blower filter that is detachably attached to a fan guard on the back side covering the fan of the blower and collects fine dust, dirt, etc. in the air sucked from the back side.

Background Art

[0002] Fine dust, dirt, etc. in the air may adhere to the fan guard covering the fan of a household electric fan. In particular, due to the air being sucked from the back side, it is known that dust and dirt easily adhere to the fan guard on the back side. For this reason, a blower filter that is attached to the fan guard on the back side to collect dust and dirt and purify the air is used.

[0003] In recent years, circulators, which are used to circulate the cold air or warm air discharged from an air conditioner throughout the room or to prevent viruses, bacteria, etc. from staying, have become widespread. Unlike an electric fan, in many circulators, the motor that drives the fan is built inside the fan guard, and it may not be possible to remove the fan guard. In this case, it is difficult to clean the inside of the fan guard, and leaving dust and dirt may lead to equipment failure. Therefore, the importance of the blower filter attached to the fan guard on the back side is increasing.

[0004] Under such circumstances, for example, as in Patent Document 1, as a blower filter attached to the fan guard on the back side of a blower, a type composed of an assembly of split blower filters divided in the circumferential direction is known.

[0005] Such a blower filter only needs to replace the soiled or damaged split blower filter, so it can reduce the labor and cost of replacement compared with the case where the whole filter has to be replaced. However, there is a problem that blower filters with different dimensions etc. have to be manufactured for each type of blower, especially for each type of its fan guard.

[0006] Therefore, as in Patent Document 2, as a developed form of this type of blower filter split in the circumferential direction, there is also known a configuration in which a blower filter piece for filling a gap between adjacent split bodies or a follower piece in the form of a flap is provided at the outer edge of the split body to follow the outer surface of the fan guard. With such a configuration, the blower filter can be attached to blowers with different models or types of fan guards.

[0007] On the other hand, as in Patent Document 3, there is also known a type of blower filter that is shaped like a dome and covers not only the fan guard but also mechanisms such as the fan drive part on the back side of the blower. Even in such a configuration, since the back side of the blower is widely covered, it can also cope to a certain extent with blowers with different models or types of fan guards.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, in the case of the blower filter of Patent Document 2, in order to conform to the blower fan guards of various manufacturers, an adhesive is applied to the outer surface of the blower filter, and it is used by being attached to the fan guard. Due to this adhesive, the air permeability of the blower filter is impaired, resulting in a decrease in dust collection ability. Also, when removing the blower filter, there is a possibility of spoiling the appearance, such as leaving glue on the fan guard of the blower.

[0010] Also, in the case of the blower filter of Patent Document 3, the filter member is made of an impregnated and cured resin material so as to be maintained in a bulging shape (bag shape), and the whole is kept in a dome shape. Therefore, it is bulky, requires space during transportation and storage, and is also conspicuous when installed on the blower, which may spoil the appearance.

[0011] Therefore, the problem to be solved by the present invention is to provide a blower filter that can be attached to blowers of various sizes without spoiling the appearance, without impairing the air permeability, and without being bulky.

Means for Solving the Problem

[0012] In order to solve the above problems, the blower filter according to the invention is a bag-shaped body or a cylindrical body having elasticity and air permeability, having an opening and a body. The elongation recovery rate (elongation elastic modulus conforming to JIS L 1096) of the opening is higher than that of the body. The opening is extended, and the rear fan guard of the blower is accommodated in the body through the opening. By the recovery of the opening, it is configured to be attachable so as to be in close contact with the outer surface of the rear fan guard.

[0013] With this configuration, since the entire blower filter has elasticity, it can be attached to blowers with different dimensions and shapes due to its expansion and contraction. Therefore, there is no need to manufacture blower filters of various dimensions and shapes for each manufacturer and model, and there is also no risk that consumers will purchase blower filters of incorrect dimensions and shapes. In addition, since the entire filter for the blower also has air permeability, during the process of air containing dust and dirt flowing through, the dust and dirt adhere to the outer surface, preventing the dust and dirt from entering the interior of the filter for the blower. The material and the like are not limited as long as it can be used as such a bag-shaped or cylindrical body having such elasticity and air permeability. For example, flexible materials such as knitted fabrics, woven fabrics, and non-woven fabrics can be mentioned. In particular, in the case of a stretchable knitted fabric such as a so-called stocking fabric, since the opening has higher resilience than other parts of the entire filter for the blower, the opening easily adheres to the outer surface of the blower, preventing gaps and preventing dust and dirt from entering the interior of the filter for the blower, which is preferable.

[0014] Since the filter for the blower is attached to and detached from the blower by utilizing its own elastic force, there is no glue residue or the like when removed from the blower as in Patent Document 2, and the air permeability is not impaired by the adhesive, and the dust collection ability does not decrease. In addition, since the filter for the blower has elasticity, when attached to the blower, it adheres closely to the fan guard. Thus, as in Patent Document 3, it does not protrude from the back of the blower in a dome shape, does not take up space, and does not damage the aesthetics. In particular, when the filter for the blower also has flexibility, the effect is remarkable, which is preferable. Also, when removed from the blower, the filter for the blower can be folded small. Compared with the case of maintaining a dome shape as in Patent Document 3, it does not require space during storage and transportation.

[0015] In the filter for the blower according to the invention, when the elongation recovery rate of the opening is O and the elongation recovery rate of the body is B, it is preferably configured such that 1 < O / B ≦ 10, and more preferably configured such that 1 < O / B ≦ 5.

[0016] With such a configuration, it becomes easier to closely adhere the filter for the blower to the blower without gaps. When O / B is 1 or less, the elongation recovery rate of the opening becomes the same as or smaller than that of the body, so the airtight locking ability of the opening to the blower decreases, gaps are generated, and there is a risk that dust and dirt may enter. When O / B exceeds 10, the elongation recovery rate of the body becomes much smaller than that of the opening, and there is a large difference in the expansion and contraction diameters of the filters for the blower at the opening and the body near the opening, so there is a risk that sagging and wrinkles may occur in the body. Therefore, when the blower is operated, the sagging and wrinkles of the body are drawn to the back side of the fan guard, and a portion that is substantially doubled due to the sagging and wrinkles of the body occurs in the filter for the blower with respect to the fan guard, and there is a risk that the air permeability decreases and the blowing ability is impaired.

[0017] In the filter for a blower according to the invention, the body has a pair of slits continuous with the opening at positions facing across the opening, and when the blower has a pair of left and right legs, the slits can each penetrate the legs. A configuration can be adopted.

[0018] With this configuration, when attaching the filter for the blower to the back side fan guard of a blower such as a so-called two-leg type circulator, by passing the legs of the blower through the slits, the legs do not become an obstacle to attachment, and the attachability is improved. When there are no slits, the legs get in the way when attaching the filter for the blower, so it becomes difficult to cover the back side fan guard deeply with the filter for the blower, and it may come off from the fan guard due to the restoring force of the opening, or the fan guard cannot be completely covered, and there is a risk that dust and dirt collection may be insufficient. The presence of the slits makes it easy to cover the back side fan guard deeply with the filter for the blower.

[0019] In the filter for a blower according to the invention, it is preferable to adopt a configuration in which the length of the slit is 20 mm or more and 100 mm or less, and more preferably to adopt a configuration in which it is 30 mm or more and 80 mm or less.

[0020] By configuring in this way, it is possible to achieve both the mountability to a so-called two-leg type blower and the dust and dirt collection performance. When the length of the slit is less than 20 mm, the length is insufficient to avoid the legs of the blower, and there is a risk of getting caught. When the length of the slit exceeds 100 mm, since it is excessively long, a gap is likely to occur between the slit and the legs in the mounted state on the blower, and there is a risk that dust and dirt will enter the inside of the blower filter through the gap.

[0021] In the blower filter according to the invention, it is preferable that the bag-shaped body or the cylindrical body is composed of a knitted fabric containing nylon yarn or urethane yarn.

[0022] By making the nylon yarn or urethane yarn into a knitted fabric containing these yarns using a knitting machine such as a circular knitting machine in this way, a bag-shaped body or a cylindrical body made of a knitted fabric rich in elasticity can be easily manufactured. For example, when knitting with a circular knitting machine, a cylindrical body having openings at both ends can be knitted directly with a circular knitting machine, and a bag-shaped body having an opening at one end is produced by knitting a cylindrical body with a circular knitting machine and then sewing and closing one of the openings. In this case, a seam is formed in the blower filter, but when attaching it to the blower, it may be attached so that the seam is located on the front side (outer side), or it may be turned inside out and attached so that it is located on the back side (inner side). However, when it is turned inside out and located on the back side (inner side), the seam is less noticeable and the design is more excellent.

[0023] In the blower filter according to the invention, it is preferable that these nylon yarns or urethane yarns have a fineness of 7 denier (d) or more and 170 denier (d) or less.

[0024] By configuring in this way, it is possible to achieve both the strength as a blower filter and the dust and dirt collection performance. When the nylon thread or urethane thread is less than 7 denier, there is a risk of holes opening in the knitted fabric or the thread breaking during the packaging of the blower filter or when it is attached to the blower, resulting in damage. Also, when these are more than 170 denier, the gaps formed between the threads in the knitted fabric become large, so there is a risk that the collection of dust and dirt with small particle sizes will be insufficient.

[0025] In the blower filter according to the invention, a configuration further including a locking tool for the blower can be adopted.

[0026] When attaching the blower filter to the rear fan guard of the blower, by additionally using locking tools such as hook-and-loop fasteners, double-sided tapes, snap buttons, and rubber bands, the locking to the blower becomes more secure, and it is further possible to prevent the blower filter from accidentally coming off the blower. Also, an adhesive may be pre-formed on the surface of the blower filter that contacts the blower to the extent that it does not inhibit air permeability.

[0027] In the blower filter according to the invention, it is preferable to adopt a configuration in which the thickness of the bag-shaped body or cylindrical body is 0.02 mm or more and 10 mm or less.

[0028] By configuring in this way, it is possible to achieve both the strength as a blower filter and the dust and dirt collection performance. When the thickness is less than 0.02 mm, it is too thin and the strength of the blower filter itself becomes low, and there is a risk of breakage etc. when attaching it to the blower. Also, since the distance that dust and dirt pass through the blower filter becomes short, there is a risk that three-dimensional collection is not sufficient. When the thickness is more than 10 mm, it is too thick and the air permeability is impaired, and there is a risk that the blowing ability of the blower will decrease.

[0029] In the blower filter according to the invention, it is preferable to adopt a configuration in which the dust collection efficiency before mounting on the blower is less than 95% when the particle size of the dust used in the dust collection efficiency test is 10 μm or more and less than 25 μm, and 15% or more when the particle size of the dust used in the dust collection efficiency test is 1 μm or more and less than 5 μm.

[0030] By configuring in this way, it is possible to exhibit good dust and dust collection performance as a blower filter without reducing the blowing ability of the blower. If the dust collection efficiency is 95% or more when the particle size of the dust used in the dust collection efficiency test is 10 μm or more and less than 25 μm, the blower filter may become clogged during use, the air permeability may be impaired, and the blowing ability of the device may be reduced. If the dust collection efficiency is less than 15% when the particle size of the dust used in the dust collection efficiency test is 1 μm or more and less than 5 μm, dust and dust may enter the blower filter, and there is a risk that sufficient dust and dust collection cannot be achieved.

Effect of the Invention

[0031] Since the blower filter according to the invention is configured as described above, it can be attached to blowers of various sizes without impairing the aesthetics, without impairing the air permeability, and without being bulky.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0033] Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the blower filter 10 in the embodiment shown is attached to the fan guard G on the back side of a blower B such as a circulator, and is used to collect dust and dirt to prevent the blower B from getting dirty.

[0034] As shown in FIGS. 1 and 2, the blower filter 10 is a bag-shaped body made of a stretchable knitted fabric, and has a cylindrical body portion 11 and an opening 12. The end portion on the side opposite to the opening 12 of the body portion 11 is closed. The blower filter 10 is flexible and can be flattened and folded when not attached to the blower B.

[0035] The dimensions of the blower filter 10 are not particularly limited, but examples thereof include a horizontal dimension (opening width) of 120 mm to 180 mm and a vertical dimension (depth) of 170 mm to 230 mm. By setting the dimensions in this way, it becomes easy to fit the fan guard G of a blower B of a general size. If the dimensions are less than these, when attaching to the fan guard G, it is necessary to stretch it excessively, the restoring force becomes large, and there is a possibility that it may come off the fan guard G unintentionally. If the dimensions exceed these, when attached to the fan guard G, a gap may be generated, and there is a risk that dust and dirt may enter the blower filter 10 through the gap.

[0036] The type of the thread forming such a bag-shaped body is not particularly limited, but nylon thread, urethane thread, or a mixture thereof is preferable. In addition, as long as the effects of the present invention are not impaired, various other threads can be mixed. By using nylon thread, the strength of the bag-shaped body can be increased, and by using urethane thread, the stretchability of the bag-shaped body can be enhanced.

[0037] The fineness of the thread is not particularly limited, but is preferably 7 denier or more and 170 denier or less, and more preferably 7 denier or more and 60 denier or less. When the fineness is less than 7 denier, there is a risk that holes may open in the knitted fabric or the thread may break during the packaging of the blower filter or when it is attached to the blower, resulting in damage. Also, when the fineness exceeds 170 denier, the gaps formed between the threads in the knitted fabric become larger, so there is a risk that the collection of dust and fine particles with small particle sizes may be insufficient. By setting the fineness to 7 denier or more and 170 denier or less, it is possible to achieve both the strength of the bag-shaped body and the dust and dirt collection performance. Even when using threads of the same material and the same fineness, by appropriately adjusting the manufacturing conditions of the knitted fabric such as adjusting the size of the knitting stitches (gauge adjustment), the ratio of the elongation recovery rate of the opening 12 and the body 11 can be set within a desired range.

[0038] The knitting method of the bag-shaped body when it is a knitted fabric as the blower filter 10 is not particularly limited, and examples include flat knitting and circular knitting. However, circular knitting using a circular knitting machine is preferred because it is simple to form the bag-shaped body. When using a circular knitting machine, a cylindrical body having openings at both ends is first knitted by circular knitting, and the bag-shaped body is completed by sewing closed one of the openings at one end. It is preferable to fold back and sew the remaining opening 12 so that the thread does not come loose. The width of the fold-back of this opening 12 is not particularly limited, but examples include 10 mm to 20 mm.

[0039] The thickness of the bag-shaped body is not particularly limited, but is preferably 0.02 mm or more and 10 mm or less. When the thickness is less than 0.02 mm, it is too thin and the strength of the blower filter itself becomes low, and there is a risk of tearing or opening holes when attaching it to the blower. Also, since the distance that dust and dirt pass through the front and back of the blower filter becomes short, there is a risk that three-dimensional collection is not sufficient. On the other hand, when the thickness exceeds 10 mm, it is too thick and may impair the air permeability, and there is a risk that the air blowing capacity of the blower will decrease. By setting the thickness to be 0.02 mm or more and 10 mm or less, it is possible to achieve both the strength as a filter for the blower and the dust and dirt collection performance.

[0040] The dust collection efficiency of the blower filter 10 is not particularly limited, but it is preferable that when the particle size of the dust used in the dust collection efficiency test is less than 25 μm and 10 μm or more, it is less than 95%, and when the particle size of the same particles is less than 5 μm and 1 μm or more, it is 15% or more. When the dust collection efficiency is 95% or more when the particle size of the dust used in the dust collection efficiency test is less than 25 μm and 10 μm or more, the blower filter may become clogged during use, the air permeability may be impaired, and the air blowing capacity of the blower may decrease. When the particle size of the dust used in the dust collection efficiency test is less than 5 μm and 1 μm or more, if the dust collection efficiency is less than 15%, dust and dust may enter the blower filter, and there is a risk that sufficient dust and dust collection cannot be achieved. By configuring the dust collection efficiency to be less than 95% when the particle size of the dust used in the dust collection efficiency test is less than 25 μm and 10 μm or more, and 15% or more when the particle size of the same particles is less than 5 μm and 1 μm or more, it is possible to exhibit good dust and dirt collection performance as a blower filter without reducing the air blowing capacity of the blower.

[0041] In the blower filter 10, the elongation recovery rate (elongation elastic modulus conforming to JIS L 1096 B-1 method) of the opening 12 is higher than that of the body 11. By doing so, the opening 12 easily adheres to the fan guard G, so that a gap is formed between the opening 12 and the fan guard G, and it is possible to prevent dust and dirt from entering the blower filter from there. In addition, since the opening 12 adheres particularly strongly to the fan guard G, it is possible to prevent the blower filter 10 from being displaced from its initial attachment position with respect to the fan guard G or from being inadvertently detached. As a method of making the elongation recovery rate of the opening 12 higher than that of the body portion 11, any method can be adopted. For example, the proportion of urethane yarn can be made higher in the opening 12 and lower in the body portion 11, the knitting density can be made different between the opening 12 and the body portion 11, or the fabric of the opening 12 can be made double.

[0042] The ratio of the elongation recovery rate of the opening 12 to that of the body portion 11 is not particularly limited. However, when the elongation recovery rate of the opening 12 is O and the elongation recovery rate of the body portion 11 is B, it is preferably 1 < O / B ≤ 10, and more preferably 1 < O / B ≤ 5. When O / B is 1 or less, the elongation recovery rate of the opening becomes the same as or smaller than that of the body portion. Therefore, the adhesion locking ability of the opening to the blower decreases, gaps are generated, and there is a risk that dust and dirt may enter. On the other hand, when O / B exceeds 10, the elongation recovery rate of the body portion becomes much smaller than that of the opening, and a large difference appears in the expansion and contraction diameters of the blower filter at the opening and in the body portion near the opening. Therefore, there is a risk that sagging and wrinkles may occur in the body portion. Therefore, when the blower is operated, the sagging and wrinkles in the body portion are attracted to the back side of the fan guard, and a portion that is substantially double due to the sagging and wrinkles in the body portion is generated in the blower filter with respect to the fan guard, which may reduce the air permeability and impair the blowing ability. By configuring it to be 1 < O / B ≤ 10, it becomes easier to closely adhere the blower filter to the blower without gaps. The range of the elongation recovery rate of the opening 12 and the body portion 11 is not particularly limited either. However, for the opening 12, the elongation recovery rate is preferably in the range of 50% or more and 100% or less, and for the body portion 11, the elongation recovery rate is preferably in the range of 10% or more and 80% or less. Within this range, the adhesion locking ability of the opening to the blower is excellent, and sagging and wrinkles are less likely to occur in the body portion.

[0043] The configuration of the air blower filter 10 is as described above. Next, with reference to FIG. 3, the method of attaching the air blower filter 10 to the fan guard G on the back side of the circulator as the air blower B will be described. First, extend the opening 12 and expand the entire body 11, and through the opening 12, accommodate the fan guard G on the back side of the air blower B inside the body 11. Then, by restoring the opening 12 and the body 11, they contract and adhere to the outer surface of the back side fan guard G. This completes the attachment.

[0044] Since the whole has elasticity, it is possible to attach it to the air blower B with different dimensions and shapes due to its expansion and contraction. Therefore, it is not necessary to manufacture air blower filters with various dimensions and shapes for each manufacturer or model, and there is also no risk that consumers will purchase air blower filters with incorrect dimensions or shapes. In addition, since the entire air blower filter has air permeability, it is possible to prevent dust and dirt from entering the inside of the air blower filter. The material etc. is not limited as long as it can be used as a bag-like body or cylindrical body having such elasticity and air permeability. For example, flexible materials such as knitted fabrics, woven fabrics, and non-woven fabrics can be mentioned. In particular, in the case of an elastic knitted fabric such as so-called stocking fabric, since the opening has higher resilience than other parts of the entire air blower filter, the opening easily adheres to the outer surface of the air blower, preventing gaps and preventing dust and dirt from entering the inside of the air blower filter, which is preferable. Since the air blower filter itself uses its own elastic force to attach and detach from the air blower, there is no glue residue etc. when removing it from the air blower, and the air permeability is not impaired by the adhesive and the dust collection ability does not decrease. In addition, since the air blower filter has elasticity and is flexible, it adheres to the fan guard when attached to the air blower, so it does not take up space or damage the aesthetics. Also, when removed from the air blower, it can be folded small and does not require space for storage and transportation.

[0045] Although not shown in the drawings, locking devices such as hook-and-loop fasteners, double-sided tapes, snap buttons, and rubber bands can also be attached to the blower filter 10. That is, one of the male and female parts of a hook-and-loop fastener or a snap button can be fixed to the fan guard G of the blower B, and the other male and female part can be fixed to the blower filter 10 for the blower. By connecting them, the blower filter 10 can be fixed to the fan guard G of the blower B. In the case of a double-sided tape, the blower filter 10 can be fixed to the fan guard G of the blower B by sticking the double-sided tape to the fan guard G of the blower B in advance. Also, in the case of a rubber band, after the blower filter 10 is attached to the fan guard G of the blower B, it can be fixed with the rubber band from above. By doing so, the locking to the blower B becomes reliable, and it is possible to further prevent the blower filter 10 from unintentionally coming off from the blower B.

[0046] FIG. 4 shows a blower filter 10 of another example. In this example, a pair of slits 11a continuous with the opening 12 are provided at positions facing each other across the opening 12 of the body portion 11. As shown in the drawing, when attaching to a circulator as the blower B, the left and right pair of legs L (the rotating shaft attached thereto in the drawing) of the blower B are inserted into the slits 11a. The legs L do not become an obstacle to attachment, and the attachability is improved. Also, since it becomes easy to cover the blower filter 10 deeply with respect to the rear fan guard G, unlike the case where it can only be covered shallowly due to the lack of slits, the blower filter 10 may come off from the fan guard G due to the restoring force of the opening 12, or the fan guard G cannot be completely covered with the blower filter 10, resulting in insufficient collection of dust and dirt. This is prevented.

[0047] The shape of the slit 11a is not limited to the illustration, and it can be V-shaped or linear. The method for forming the slit 11a is not particularly limited, but an example is cutting the opening edge of the blower filter 10. When using a knitted fabric as the blower filter 10, it is preferable to sew it to prevent the threads of the bag-shaped body from unraveling from the slit 11a.

[0048] The dimensions of the slit 11a are not particularly limited either, but its length is preferably 20 mm or more and 100 mm or less, and more preferably 30 mm or more and 80 mm or less. When the length is less than 20 mm, the length is insufficient to avoid the leg portion L of the blower B, and there is a risk of getting caught. When the length exceeds 100 mm, since it is excessively long, a gap is likely to occur between the slit 11a and the leg portion L in the state of being attached to the blower B, and there is a risk that dust and dirt may enter the inside of the blower filter through the gap. By setting the length of the slit 11a to be 20 mm or more and 100 mm or less, it is possible to achieve both the mountability to the blower B having a pair of left and right leg portions L and the dust and dirt collection performance.

[0049] FIG. 5 shows another example of the blower filter 10. In this example, the blower filter 10 is not a bag-shaped body but a cylindrical body. That is, another opening 13 is provided at the end of the body portion 11 on the side opposite to the opening 12. The method for making the blower filter 10 into a cylindrical body is not particularly limited. For example, when the blower filter 10 is a knitted fabric and circular knitting is performed using a circular knitting machine, unlike the case of a bag-shaped body, one of the openings at both ends is not sewn closed and is directly used as the other opening 13.

[0050] As shown in the figure, when installing on a fan as the blower B, when installing the blower filter 10, while greatly extending the opening 12 and the other opening 13, move it from the front side of the fan to the back side fan guard G side, fix the opening 12 to the front side end of the fan of the back side fan guard G, and while expanding the entire body 11, shift the other opening 13 until it is located at a part of the motor mechanism part M protruding rearward from the back side fan guard G and fix it to the motor mechanism part M, so that the blower filter 10 can be brought into close contact with the fan guard G. In the illustration, the diameter of the blower filter 10 is greatly expanded, and it is installed by passing through the front side fan guard and the fan F from the front side of the blower B.

Example

[0051] Hereinafter, the content of the present invention will be further clarified by giving examples of the present invention.

[0052] As Example 1, a stretchable blower filter made of a 150 mm × 200 mm bag-shaped body was fabricated. The opening part was made of 10-denier urethane yarn and 20-denier nylon yarn, the body part was made of 20-denier nylon yarn, and the filter thickness was 1 mm. Using a high-gauge circular knitting machine (4 inches: 450 needles), the ratio (O / B) of the elongation recovery rate of the opening part to that of the body part was adjusted to 2.4 when the elongation recovery rate of the opening part was O and that of the body part was B. The elongation recovery rate was measured in accordance with JIS L 1096 B-1 method, but the test piece, the length between gauge marks, and the load were measured after being changed to the following conditions. First, the test piece was cut out in a size of width 15 mm × length 150 mm from the blower filter, with the direction perpendicular to the horizontal dimension (opening width) as the width and the direction parallel to the horizontal dimension (opening width) as the length. One test piece was cut out from each of the opening part and the body part for one blower filter. Also, the length between gauge marks was set to 100 mm. After applying an initial load (opening part: 29 mN, body part: 21 mN) to the test piece, a mark of 100 mm was made in the length direction of the test piece and this was taken as the length between gauge marks. Then, a load of 4.9 N was applied to the test piece, and the length between the marks was measured 1 hour later. After removing the load, the length between the marks was measured 1 hour later, and the elongation recovery rate (%) was obtained from the following formula. Er={(L1-L’1) / (L1-L0)}×100 Er: Elongation elastic modulus (elongation recovery rate) (%) L0: 100 mm L1: Length between marks after applying a load of 4.9 N for 1 hour (mm) L’1: Length between marks when the initial load was applied 1 hour after removing the load (mm) The elongation recovery rate (O) of the opening part measured by this method was 97%, and the elongation recovery rate (B) of the body part was 40.4%. The filter used had a dust collection efficiency of 70% before installation when the particle size of the dust was 10 μm or more and less than 25 μm, and 20% when the particle size was 1 μm or more and less than 5 μm. The dust collection efficiency (%) was measured by installing a permeation device without attaching a filter to the outlet of the dust generator, sucking at a rate of 28.3 L / min, measuring the number of dust particles before filter measurement, then attaching a 5 cm × 5 cm filter to the permeation device, and measuring the number of dust particles after permeation with the measured filter area being 9.08 cm 2 After that, the number of dust particles after permeation was measured. The filter was removed from the permeation device, the number of dust particles after filter measurement was measured, and the dust collection efficiency was calculated from the following formula. Dust collection efficiency (%) = {(Number of dust particles before permeation - Number of dust particles after permeation) / Number of dust particles before permeation} × 100 Number of dust particles before permeation: Average of the measured values of the number of dust particles before filter measurement and the number of dust particles after filter measurement Here, 50 mm slits were formed at two opposing positions of the opening. Six 10 mm × 20 mm surface fasteners were used as locking devices and were affixed at equal intervals on the circumference of the peripheral edge, excluding the connection part between the main body and the legs of the blower (a so-called two-legged type circulator as shown in Fig. 4).

[0053] As Example 2, a stretchable filter for a blower made of a 150 mm × 200 mm bag-shaped body was produced. No slits were formed. In Example 2, the opening and the body were formed to have a filter thickness using the same yarn as in Example 1, but using a high-gauge circular knitting machine (4 inches: 100 needles), the ratio (O / B) of the elongation recovery rate of the opening and the body was adjusted to be 1.7. The elongation recovery rate was measured in the same manner as in Example 1. The elongation recovery rate (O) of the opening was 80% and the elongation recovery rate (B) of the body was 47%. The filter used had a dust collection efficiency of 80% before installation when the particle size of the dust was 10 μm or more and less than 25 μm, and 40% when the particle size was 1 μm or more and less than 5 μm. The dust collection efficiency was measured in the same manner as in Example 1. Six 10 mm × 20 mm surface fasteners were used as locking devices and were affixed at equal intervals on the circumference of the peripheral edge of the blower (a fan as shown in Fig. 5).

[0054] As Example 3, a stretchable blower filter made of a 150 mm × 200 mm bag-shaped body was manufactured. No slits were formed. In Example 3, the same yarn as in Example 1 was used to form the opening and the body so as to obtain the filter thickness. However, using a high-gauge circular knitting machine (4 inches: 530 needles), the ratio (O / B) of the elongation recovery rate of the opening and the body was adjusted to be 4.0. The elongation recovery rate was measured in the same manner as in Example 1. The elongation recovery rate (O) of the opening was 95%, and the elongation recovery rate (B) of the body was 23.75%. A dust collection efficiency before mounting of 60% when the particle size of the dust was 10 μm or more and less than 25 μm and 18% when the particle size was 1 μm or more and less than 5 μm was used. The dust collection efficiency was measured in the same manner as in Example 1. As the locking tool, six 10 mm × 20 mm hook-and-loop fasteners were used and affixed at equal intervals on the circumference of the peripheral edge of a blower (a fan like that in FIG. 5).

[0055] As Example 4, a stretchable blower filter made of a 150 mm × 200 mm bag-shaped body was manufactured. The opening was made of 70-denier urethane yarn and 160-denier nylon yarn, and the filter thickness was 1 mm. Using a high-gauge circular knitting machine (4 inches: 450 needles), the ratio (O / B) of the elongation recovery rate of the opening and the body was adjusted to be 2.1. The elongation recovery rate was measured in the same manner as in Example 1. The elongation recovery rate (O) of the opening was 95%, and the elongation recovery rate (B) of the body was 36.5%. For the filter, a dust collection efficiency before mounting of 85% when the particle size of the dust was 10 μm or more and less than 25 μm and 35% when the particle size was 1 μm or more and less than 5 μm was used. Here, 50-mm slits were formed at two opposing positions of the opening. As the locking tool, six 10 mm × 20 mm hook-and-loop fasteners were used and affixed at equal intervals on the circumference of the peripheral edge, excluding the connection part between the main body and the legs of a blower (a so-called two-leg type circulator like that in FIG. 4).

[0056] As Comparative Example 1, a stretchable blower filter made of a bag-shaped body with dimensions of 150 mm × 200 mm was fabricated. It was created using a high gauge circular knitting machine (4 inches: 450 needles), and both the opening part and the body part were made of 20-denier nylon yarn, with a filter thickness of 1 mm. Here, 50-mm slits were formed at two opposing locations in the opening part. The ratio (O / B) of the elongation recovery rate of the opening part to that of the body part was 1. The elongation recovery rate was measured in the same manner as in Example 1. The elongation recovery rate (O) of the opening part was 47%, and the elongation recovery rate (B) of the body part was 47%. A dust collection efficiency before installation of 70% when the particle size of the dust was 10 μm or more and less than 25 μm, and 20% when the particle size was 1 μm or more and less than 5 μm was used. The dust collection efficiency was measured in the same manner as in Example 1. As a locking device, six 10 mm × 20 mm surface fasteners were used and affixed at equal intervals on the circumference of the peripheral edge excluding the connection part between the main body and the legs of the blower (a so-called two-leg type circulator as shown in FIG. 4).

[0057] As Comparative Example 2, a stretchable blower filter made of a bag-shaped body with dimensions of 150 mm × 200 mm using a non-woven fabric was fabricated. No slits were formed. The ratio (O / B) of the elongation recovery rate of the opening part to that of the body part was 1. The elongation recovery rate was measured in the same manner as in Example 1. The elongation recovery rate (O) of the opening part was 36%, and the elongation recovery rate (B) of the body part was 36%. As a locking device, six 10 mm × 20 mm surface fasteners were used and affixed at equal intervals on the circumference of the peripheral edge of the blower. A dust collection efficiency before installation of 40% when the particle size of the dust was 10 μm or more and less than 25 μm, and 13% when the particle size was 1 μm or more and less than 5 μm was used. The dust collection efficiency was measured in the same manner as in Example 1. As a locking device, six 10 mm × 20 mm surface fasteners were used and affixed at equal intervals on the circumference of the peripheral edge of the blower (a fan as shown in FIG. 5).

[0058] Regarding the blower filters of Examples 1 to 4 above, the dust collection efficiency, elongation recovery rate, and ratio of the elongation recovery rate are shown in Table 1. Also, regarding the blower filters of Comparative Example 1 and Comparative Example 2, the dust collection efficiency, elongation recovery rate, and ratio of the elongation recovery rate are shown in Table 2.

[0059] [Table 1]

[0060] [Table 2]

[0061] When the filters for the blowers of Example 1, 4 and Comparative Example 1 were attached to a so-called two-leg type circulator as shown in Fig. 4, and the filters for the blowers of Example 2 - 3 and Comparative Example 2 were attached to a fan as shown in Fig. 5 and each blower was operated for a certain period of time, in Example 1 - 4, no gap occurred and it was confirmed that there was no accidental dropping, and good attachment performance and dust and dirt collection performance were obtained. On the other hand, in Comparative Example 1 and Comparative Example 2, it was found that gaps occurred in parts other than the part locked by the hook-and-loop fastener at the opening, allowing dust and dirt to enter.

[0062] The embodiments and examples disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown by the scope of the claims, and includes all modifications and changes within the scope and equivalent meanings thereof.

[0063] The shape of the filter for the blower is not limited as long as it is bag-shaped or cylindrical. For example, when it is bag-shaped, it does not have to be a so-called corner bag shape as shown in Fig. 1, and it may be dome-shaped, bowl-shaped, or multi-corner bag-shaped. Even when it is cylindrical, its diameter may be non-uniform. [Explanation of Signs]

[0064] 10 Filter for blower 11 Body 11a Slit 12 Opening 13 Other opening B Blower F Fan G Fan Guard L Leg M Motor Mechanism

Claims

1. A filter for a blower to be attached to the rear side fan guard of a blower such as an electric fan or a circulator, A bag-like or tubular body having elasticity and breathability, The container has an opening and a body, The elongation recovery rate of the opening is higher than the elongation recovery rate of the body portion, The opening is extended, the rear fan guard of the blower is housed within the body through the opening, and the opening is restored to its original state so that the blower filter can be attached in close contact with the outer surface of the rear fan guard.

2. 2. The blower filter according to claim 1, wherein the following formula is satisfied, where O is an elongation recovery rate of the opening portion and B is an elongation recovery rate of the body portion. 1<O / B≦10

3. 3. The blower filter according to claim 1, wherein the body portion has a pair of slits that are connected to the opening at opposing locations across the opening, and when the blower has a pair of left and right legs, each of the slits is capable of inserting the legs therethrough.

4. 4. The blower filter according to claim 3, wherein the slit has a length of 20 mm or more and 100 mm or less.

5. 3. The filter for a blower according to claim 1, wherein the bag-shaped body or the cylindrical body is made of a knitted fabric containing nylon yarn or urethane yarn.

6. 6. The filter for a blower according to claim 5, wherein the nylon yarn or the urethane yarn has a fineness of 7 denier or more and 170 denier or less.

7. The filter for a blower according to claim 1 or 2, further comprising a fastener for fastening to the blower.

8. 3. The filter for a blower according to claim 1, wherein the bag-shaped body or the cylindrical body has a thickness of 0.02 mm or more and 10 mm or less.

9. 3. The filter for a blower according to claim 1 or 2, wherein the dust collection efficiency before attachment to the blower is less than 95% when the particle diameter of the dust particles used in a dust collection efficiency test is 10 μm or more and less than 25 μm, and is 15% or more when the particle diameter of the dust particles is 1 μm or more and less than 5 μm.

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