JP5449865B2 - Dust bag for vacuum cleaner - Google Patents

Description

  The present invention relates to a dust collection bag for an electric vacuum cleaner that collects dust separated from dust and air by filtering dust-containing air sucked into a cleaner body.

  A bag-like body that is set in the vacuum cleaner body and expands when the suction blower is activated and dust is collected inside, and is attached to the front wall of the bag-like body and used for setting to the vacuum cleaner body 2. Description of the Related Art A dust collecting filter for a vacuum cleaner provided with a support plate provided with a dust suction port in the center is known as a conventional technique (for example, see Patent Document 1).

  The bag-like body of the dust collection filter is made using a filter medium having air permeability and flexibility, that is, a single filter medium comprising a protective sheet such as paper and a non-woven sheet provided so as to overlap the inside. It has been. That is, the single filter medium is formed in a horizontally long cylindrical shape by bending and closing both ends in the longitudinal direction and providing single or double gusset portions (folded portions) on both sides in the longitudinal direction. This bag-like body has a laminating portion for making a horizontally long cylindrical shape and a laminating portion for closing both ends in the longitudinal direction, and laminating at these laminating portions is performed by adhesion using an adhesive. Has been done.

JP-A-2-302236 (page 3, upper right column, line 13 to same page, lower left column, line 20; page 4, upper right column, lines 3 to 10; FIGS. 1-3, 7, and 10)

  The back surface portion of the bag-like body that has been inflated with the start of the suction blower is positioned so as to face the back side of the support plate, and the airflow (dust-containing matter) sucked into the bag-like body through the dust suction port of the support plate Since air flow) is the site where it acts most strongly, it is preferable to allow good filtration at this backside site.

  Therefore, in the dust collection filter of patent document 1, the inner surface of a bag-shaped body is formed with the nonwoven fabric which is easy to take up dust, and the dust collection property in the back surface part of a bag-shaped body is improved. In addition to this, in order to be able to perform good filtration at the back surface part, increase the number of filter media used to form the bag-like body and increase the back part to increase the dust collecting property of the back surface part. Is also considered.

  However, if dust collection is improved, the air permeability of the dust bag decreases due to the device. Therefore, the air permeability of the bag-like body of the dust collection filter of Patent Document 1 in which the air permeability of each part of the bag-like body is the same because the bag-like body is formed of a single filter medium as described above. Relatively bad.

  Therefore, when the dust collecting filter of Patent Document 1 is clogged with the trapping of dust, the dust collecting filter is likely to clog other than the back side portion of the bag-like body in a relatively short period of time. It is not suitable for long use. Furthermore, in the dust collection filter of Patent Document 1 in which both ends in the longitudinal direction and the longitudinal direction of the bag-like body are bonded, in order to ensure the reliability of bonding, the area where the adhesive is applied is relatively large, And since the filtration area of the whole bag-like body is reduced according to the adhesion part which does not have air permeability of these three places, it will be easily clogged in a shorter time. And when the whole bag-like body is clogged, the amount and speed of the airflow passing through the bag-like body are lowered. Along with this, the airflow passing through the bag-like body also reduces the performance of compressing the dust accumulated in the bag-like body, so it is not suitable for collecting more dust.

  As described above, the conventional dust collecting filter can be used for a long time while preventing dust clogging at the back side of the bag-like body and suppressing early clogging, and a larger amount of dust separated by filtration. There is a problem that it is not suitable for accumulating.

In order to solve the above-mentioned problems, a dust bag for a vacuum cleaner according to the present invention includes a support plate having a dust passage hole, a first filter member fixed to the back surface of the support plate, and the filter member. A breathable filter bag body having a second filter member bonded to the peripheral edge, and a back surface portion disposed so as to face the back surface of the support plate in a state where the filter bag body is inflated. The air permeability of the first filter member is made higher than the air permeability of the second filter member , and the first filter member has a quadrangular shape larger than the support plate, and the second filter member is The back surface portion having a rectangular shape substantially the same size as one filter member, and at least a pair of gusset portions that are integrally continuous with the back surface portion and folded so as to approach each other from the back surface portion, First filter member The first to face the gusset portion to the inner surface of the peripheral portion of the second filter member is characterized by being bonded. The present invention can also be a single gusset type dust collecting bag with the number of gusset portions folded in the thickness direction of the filter bag body as one, and similarly, the double gusset type or It can also be a triple gusset type dust bag.

  In the present invention, the peripheral portions of the first and second filter members may be bonded using an adhesive or may be bonded by welding. In the present invention, the dust collection property of the second filter member may be equal to the dust collection property of the first filter member, but is preferably higher.

  In the present invention, the filter bag body that collects the dust separated by filtration has the first filter member fixed to the support plate, and the back surface on which the airflow (dust-containing airflow) sucked into the filter bag body acts most strongly. A second filter member having a portion and bonded to the peripheral edge of the first filter member is provided. Therefore, by selecting the material, the number of layers, the thickness, and the like of the filter medium constituting these filter members, the air permeability of the filter bag body is mainly handled by the first filter member, and the dust trapping property of the filter bag body is mainly used by the second filter. The dust bag carried by the member can be provided.

According to this dust collection bag, the first filter member has the first characteristic that the air permeability of the entire filter bag body is deteriorated due to the dust collection property of the second filter member (capability of capturing dust by filtration). While being able to be suppressed by the air permeability of the filter member, the dust trapping property of the second filter member having the back surface portion where the suction airflow acts strongly due to the increased air permeability of the first filter member. It will not be lowered. Therefore, while ensuring the dust trapping property at the back surface part of the filter bag body, it can be used for a long time by suppressing the early clogging of the filter bag body, and the action of compressing the dust separated by filtration with the airflow is continued. Thus, a larger amount of dust can be stored in the filter bag. Furthermore, according to this dust collection bag, the filter bag body expands and the first filter member is pulled obliquely rearward so that the bonded portion is not crushed and a large load is not applied to the bonded portion. At the same time, there is no risk that the part will fall apart due to the wind pressure that acts strongly on the part where the back surface part of the filter bag body and the gusset part are continuous.

  In the present invention, it is preferable that both the filter members are made of a filter medium made of thermoplastic chemical fibers and the peripheral portions of these filter members are bonded together by welding. The term “welding” in this preferred form refers to pressing a high-temperature seal mold against a predetermined bonding portion of the filter bag body and fusing the predetermined bonding portion, and may be accompanied by embossing, for example. Further, in this preferred embodiment, the peripheral edge portions of both filter members are the same as the bonded portion formed by welding, or the bonded portion formed by welding and the end protruding outside from the bonded portion. In the case of the former peripheral portion, it is preferable that there is no end portion that may be frayed during storage and handling of the dust bag.

  In the present invention, it is preferable that the number of layers of the filter medium forming the first filter member is smaller than the number of layers of the filter medium forming the second filter member. In this preferred embodiment, the number of layers of the filter medium indicates that the number of layers is at least one, and when the number of layers is two or more, the same type of filter medium or different types of filter medium for each layer may be used.

  In the present invention, the second filter member is formed of two or more layers of filter medium, and the filter medium facing the internal space of the filter bag body among these filter mediums is the first filter member. The filter medium is formed of a different material from the filter medium facing the internal space of the filter bag body, and the dust trapping performance of the filter medium is higher than that of the filter medium forming the first filter member. It is preferable.

  In the present invention, the second filter member is formed of two or more layers of filter media, and the filter media facing the internal space of the filter bag body among these filter media is thicker than the filter media on the outer side. And it is preferable that dust collection property is high. In this preferred form, the two or more layers of filter media that bear the second filter member may be the same type or different types of filter media, and the thickness of these filter media may be the same or different.

  In the present invention, it is preferable that at least one of the deodorizing material or the antibacterial material is impregnated in at least a part of the filter bag body. In this preferred form, at least one of the deodorant material or antibacterial material is a deodorant material alone, an antibacterial material alone, or both of these deodorant material and antibacterial material, or a drug having a deodorizing action and an antibacterial action ( Deodorant / antibacterial agent). Furthermore, in this preferred embodiment, at least a part of the filter bag body indicates either the first filter member, the second filter member, or both filter members, and the corresponding filter member is a double layer. In this case, it is sufficient to impregnate at least one of the deodorizing material or antibacterial material into at least one of them, but the deodorizing action or antibacterial action acts more effectively on the dust accumulated in the filter bag. In this case, at least one of the deodorant material or the antibacterial material is preferably impregnated into the filter material facing the internal space of the filter bag body. Moreover, you may apply | coat instead of impregnating.

  In the present invention, it is preferable that at least one of the deodorizing material or the antibacterial material is impregnated or applied to the first filter member. In this preferred form, when the first filter member has two or more layers, at least one of the deodorizing material and the antibacterial material may be impregnated or applied to at least one of the first filter members. In order to make the deodorized performance or antibacterial performance act more effectively on the generated dust, at least one of the deodorized material or the antibacterial material is impregnated in the filter material of the first filter member facing the inner space of the filter bag body. Alternatively, it may be applied.

According to the dust bag for a vacuum cleaner of the present invention, the filter bag body can be used for a long time while preventing the filter bag body from being clogged, while ensuring dust collection at the back surface portion, and separated by filtration. There is an effect that a larger amount of collected dust can be collected. Further, as the filter bag body expands, a large load is not applied to the bonding portions of the first and second filter members, and the filter bag body acts on a portion where the back surface portion and the gusset portion are continuous. There is no risk that this part will fall apart due to the wind pressure.

It is an approximate top view showing a vacuum cleaner provided with a dust bag concerning one embodiment of the present invention partially cut away. FIG. 2 is a schematic side view showing the electric vacuum cleaner of FIG. (A) is a front view of a dust bag according to an embodiment of the present invention. (B) is a back view of the dust bag. It is a side view of the dust bag which concerns on one embodiment of this invention. It is sectional drawing of the dust bag shown along the arrow F5-F5 line in FIG. 3 (B). It is sectional drawing equivalent to FIG. 5 which shows the dust collection bag which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  Reference numeral 1 in FIGS. 1 and 2 denotes a canister type vacuum cleaner, for example. The vacuum cleaner main body 2 provided in the electric vacuum cleaner 1 is movable along the floor surface of the room to be cleaned by a caster 3 attached to the front part and a pair of wheels 4 attached to the rear part.

  The vacuum cleaner body 2 is provided with a partition 5 that also serves as a bag support member that supports a rear surface portion of a dust collection bag, which will be described later. The interior of the vacuum cleaner body 2 with the partition 5 as a boundary is the rear side (downstream side) of the partition 5. The electric blower chamber 2a and the front (upstream) dust collection chamber 2b are divided. The dust collection chamber 2b is opened on the upper surface of the front part of the cleaner body 2, for example.

  The partition 5 is made of, for example, a synthetic resin. Therefore, in the present embodiment, the entire front surface of the partition 5 faces the dust collection chamber 2b. The area of the partition 5 facing the dust collection chamber 2b has air permeability. In order to obtain this air permeability, the partition 5 is formed with a plurality of ventilation portions, for example, a plurality of slits 5a extending in the vertical direction. The plurality of ventilation portions may be small holes having a hole shape such as a circular shape or an oval shape, and the region facing the dust collection chamber 2b of the partition 5 may be configured in a lattice shape by these small holes. is there. It should be noted that a plurality of ribs may be provided on the front surface in order to prevent the back surface portion 31a described later from being flatly deformed and stuck to the front surface (upstream side surface) of the partition 5 to block the slit 5a. .

  The vacuum cleaner body 2 has a suction port 6 located on the upstream side of the partition 5 with reference to an airflow sucked into an electric blower 8 described later. In this embodiment, the suction port 6 is located at the front end of the cleaner body 2. Is provided. The suction port 6 communicates with the dust collection chamber 2b between this and the partition 5. The vacuum cleaner body 2 has a bag support wall 2c continuous to the outlet end of the suction port 6 facing the dust collection chamber 2b.

  The bag support wall 2c is provided, for example, in parallel with the partition 5, and partitions the front end of the dust collection chamber 2b. A support groove 2d is formed in the bag support wall 2c. The support groove 2d is provided between the left and right vertical groove portions (see FIG. 1), which are provided on the left and right sides of the suction port 6 when the cleaner body 2 is viewed from the front side, and the lower ends of these vertical groove portions are continuous. And a lower groove portion (see FIG. 2) provided on the lower side of the suction port 6.

  The dust collection chamber 2b is provided with a plurality of bottom ribs 7 (only one is shown in FIG. 2) integrally projecting upward from the bottom wall. These bottom ribs 7 extend in the front-rear direction so as to extend over the bag support wall 2c and the partition 5, and ensure an air passage between them.

  A suction air passage body (not shown) is connected to the suction port 6. The suction air passage body includes a dust suction hose connected by inserting one end portion into the suction port 6, an extension pipe connected to the other end portion of the hose, and a suction mouth body connected to the distal end portion of the extension pipe It has. The other end of the dust suction hose is provided with an operation handle having an operation panel for giving various commands to the electric blower 8 described later. Therefore, the air (dust-containing air) sucked in with dust from the suction opening opened on the lower surface of the suction port body by the suction force of the electric blower 8 driven during the operation of the vacuum cleaner 1 is the suction air path. It is introduced into the suction port 6 through the body and sucked into the dust collection chamber 2b.

  An electric blower 8 is accommodated in the electric blower chamber 2a. Therefore, a partition 5 is provided between the electric blower 8 and the dust collection chamber 2b. A cord reel device (not shown) for supplying power to the electric blower 8 is accommodated in the electric blower chamber 2a. A power plug 9 (see FIG. 1) of the cord reel device is pulled out of the cleaner body 2 and connected to a commercial AC power source (not shown). Further, an indexer 10 is provided in the electric blower chamber 2a. The indexer 10 is arranged over the partition 5 and the electric blower 8 and guides the air that has passed through the partition 5 from the dust collecting chamber 2b to an intake port (not shown) of the electric blower 8. Note that an exhaust portion (not shown) is provided at the rear end portion of the cleaner body 2, and the air discharged from the electric blower 8 passes through the exhaust portion and is exhausted out of the cleaner body 2.

  The vacuum cleaner main body 2 has a main body lid 11 at the front part thereof. The main body lid 11 is attached to the upper surface portion of the cleaner body 2 so that the rear end portion thereof serves as a rotation fulcrum, and the upper surface opening of the dust collecting chamber 2b is opened and closed by manually rotating the main body lid 11. The The main body lid 11 is provided with a plurality of lid ribs 12 (only one is shown in FIG. 2) integrally projecting downward from the inner surface thereof. These lid ribs 12 extend in the front-rear direction so as to extend over the bag support wall 2c and the partition 5, and ensure an air passage between them.

  A dust collection bag 21 is stored in the dust collection chamber 2b. The dust bag 21 can be taken in and out with the main body lid 11 opened. The dust collection bag 21 will be described in detail with reference to FIGS. The dust bag 21 includes a support plate 23 to which a sealing material 22 is fixed, and a filter bag body 25 having air permeability.

  The support plate 23 is made of thick paper such as cardboard, has a substantially rectangular shape as shown in FIG. 3A, and is formed to have a size that can be inserted into and removed from the support groove 2d in the vertical direction. Yes. A dust passage hole 24 is provided at the center of the support plate 23. The dust passage hole 24 is circular, for example. The sealing material 22 is bonded to the back surface of the support plate 23 using an adhesive (not shown). The sealing material 22 is made of a thin film such as a flexible and elastic rubber sheet, and has a through hole 22a at the center. The diameter of the through hole 22 a is smaller than the dust through hole 24. The through hole 22 a of the sealing material 22 and the portion around the through hole 22 a are opposed to the inside of the dust through hole 24.

  As shown in FIG. 5, the filter bag body 25 includes a first filter member 26 and a second filter member 31.

  The first filter member 26 is a second filter member based on the airflow that passes through the filter bag body 25 and is sucked into the electric blower 8 with the dust bag 21 set in the cleaner body 2. It is mainly disposed on the upstream side of 31, specifically, on the front side of the second filter member 31. The first filter member 26 is formed by combining two layers of a filter medium having air permeability such as a nonwoven fabric, and the air permeability is higher than that of the second filter member 31.

  The inner filter medium 27 that forms the inner layer of the first filter member 26 faces the internal space of the filter bag body 25. The inner filter medium 27 is a nonwoven fabric made of thermoplastic chemical fiber manufactured by a melt blown method. The outer filter medium 28 forming the outer layer of the first filter member 26 is a nonwoven fabric made of thermoplastic chemical fiber manufactured by a spunbond method.

  That is, the inner filter medium 27 is formed by extruding molten resin such as polypropylene at a high temperature from a nozzle and drawing it into a yarn at the same time. After the fibers made of the yarn are lowered onto the conveyor net to intertwine the fibers, the dots are embossed by heat. It is a nonwoven fabric obtained by press-bonding into a sheet by processing. The outer filter medium 28 is a non-woven fabric obtained by blowing a molten resin, such as polypropylene, at a high temperature from a nozzle at a high temperature and blowing it with high-temperature air to make the fibers thinner.

  Since the nonwoven fabric manufactured by the spunbond method is likely to have a smaller fiber diameter than the nonwoven fabric manufactured by the melt blown method, the dust collection performance (dust collection) is high. In the manufacture of the outer filter medium 28, the fibers blown off with high-temperature air are directly blown onto the inner filter medium 27 that has already been manufactured into a sheet shape without being formed into a sheet by pressure bonding. 27 is compounded. Thus, the filter media 27 and 28 can be combined without crushing the fibers of the inner and outer filter media 27 and 28 while enabling the delamination between the inner filter media 27 and the outer filter media 28 to some extent, so that high efficiency can be achieved with low pressure loss. The first filter member 26 can be used.

  As described above, the shape of the first filter member 26 composited in two layers in a developed state is a rectangular shape larger than the support plate 23, for example, a rectangular shape as shown in FIG. The central portion of the first filter member 26 is fixed to the back surface of the support plate 23 using an adhesive. In this case, the periphery of the support plate 23 is out of the adhesion region.

  The second filter member 31 is a first filter member based on the airflow that passes through the filter bag body 25 and is sucked into the electric blower 8 with the dust bag 21 set in the cleaner body 2. It is mainly disposed downstream of the first filter member 26, specifically, on the rear side of the first filter member 26. The second filter member 31 is formed in a multilayer and thicker than the first filter member 26 by a plurality of air-permeable filter media. Specifically, the second filter member 31 is formed using, for example, a three-layer nonwoven fabric. The air permeability of the second filter member 31 is lower than the air permeability of the first filter member 26.

  The inner filter medium 32 that forms the inner layer of the second filter member 31 faces the internal space of the filter bag body 25. The inner filter medium 32 is formed of a material different from the filter mediums 27 and 28 forming the first filter member, for example, a thermoplastic chemical fiber, specifically a non-woven fabric made of polyester, and is subjected to needle punching. Yes. The needle punching process is a process in which several thousand fine needles are pierced into the polyester nonwoven fabric forming the inner filter medium 32. Thereby, the fibers of the polyester nonwoven fabric are raised so as to be fluffy, and are formed thicker than the outer filter medium 33 and the intermediate filter medium 34 described later. The filter medium that has been subjected to needle punching has lower air permeability than the filter medium that has not been subjected to the same processing.

  The outer filter medium 33 forming the outer layer of the second filter member 31 is a thermoplastic chemical fiber manufactured by a spunbond method, for example, a nonwoven fabric made of polypropylene. The intermediate filter medium 34 constituting the intermediate layer of the second filter member 31 is a thermoplastic chemical fiber manufactured by a melt blown method, for example, a nonwoven fabric made of polypropylene.

  The air permeability of the inner filter medium 32, the intermediate filter medium 34, and the outer filter medium 32 is low in the order of description of these filter media. Furthermore, as described above, the inner filter medium 32 is thicker than the intermediate filter medium 34 and the outer filter medium 32, and has a higher dust trapping property than the intermediate filter medium 34 and the outer filter medium 32.

  As shown in FIG. 5, the second filter member 31 has a back surface portion 31a and a pair of left and right gusset portions 31b. Therefore, the dust bag 21 of this embodiment is a single gusset type. As is clear from the comparison between FIGS. 3A and 3B, the back surface portion 31 a has a quadrangular shape that is substantially the same size as the first filter member 26. The left and right gusset portions 31b are folded so as to approach each other from both side edges of the back surface portion 31a. These folded shapes are substantially V-shaped in cross section as shown in FIG.

  The first filter member 26 and the second filter member 31 are combined with each other by overlapping the inner filter media 27 and 32, and the peripheral portions thereof are bonded to form the filter bag body 25. In this case, since the filter bag body 25 is made of a thermoplastic filter medium, the adhesion is made by adhering the peripheral edge by, for example, high-frequency heat welding. Reference numeral 35 in FIG. The width of the bonding portion 35 is as narrow as several mm. Together with this, the bonding portion 35 forms the peripheral edge of the filter bag body 25. Accordingly, there is no end portion of the filter bag body 25 that may be frayed along with the storage and handling of the dust bag 21, that is, the end portion of the filter medium that protrudes outside the adhesive portion 35. Is preferable.

  Each of the filter media 27, 28, and 32 to 34 forming the filter bag body 25 is impregnated with a deodorant material or an antibacterial material (not shown). In this case, since the first filter member 26 is composed of two layers of filter media 27 and 28, the inner filter media 27 contacting the dust accumulated in the filter bag body 25 is impregnated with the antibacterial material, and the outer filter media 28 is deodorized. It is preferable to impregnate. Similarly, since the second filter member 31 includes three layers of filter media 32 to 34, it is preferable to impregnate the inner filter media 32 with an antibacterial material and impregnate the outer filter media 33 and the intermediate filter media 34 with a deodorizing material.

  In addition, the deodorizing material or the antibacterial material can be impregnated in either the first filter member 26 or the second filter member 31. In this case, in particular, the deodorizing material is preferably impregnated into at least one filter medium of the first filter member 26 having higher air permeability. Thereby, it is preferable at the point which can give the deodorizing effect with respect to the air which flows out out of the dust collection bag 21, without being disturbed by the dust collected in the dust collection bag 21. FIG.

  The state before the dust bag 21 of the said structure is folded is shown by FIG. 3 (A) (B) and FIG. In this state, the portion of the filter bag body 25 protruding up and down from the support plate 23 is folded as shown by the arrow in FIG. 4 and arranged on the back side of the support plate 23. In this folded state, the dust collection bag 21 is It is set in the dust collection chamber 2b of the cleaner body 2. In this case, the dust collection bag 21 is set by inserting the support plate 23 into the support groove 2d of the bag support wall 2c from above and supporting it. In this set state, the dust passage hole 24 of the support plate 23 is arranged to face the suction port 6 of the cleaner body 2 as shown in FIGS. 1 and 2.

  After the dust collection chamber 2b is sealed with the main body lid 11, when the electric blower 8 is driven to put the vacuum cleaner 1 into use, the filter bag body 25 of the dust collection bag 21 immediately puts the filter bag body 25 therein. It expands due to the flow of air that passes from

  In this case, immediately after the electric blower 8 is started, a strong wind pressure acts on the back surface portion 31 a of the filter bag body 25 positioned so as to face the back of the dust passage hole 24 of the support plate 23. By the way, the air permeability of the 2nd filter member 31 which consists of this back surface part 31a and the side part integrally continued on both right and left sides is lower than the air permeability of the 1st filter member 26 ahead of the back surface part 31a. . Therefore, although air flows through the second filter member 31, the resistance is relatively large at that time, and the filter bag body 25 can be easily expanded rearward. In addition, at this time, the gusset portions 31b that the second filter member 31 has on both the left and right sides thereof are opened, and the rearward expansion of the filter bag body 25 is allowed. Therefore, the filter bag body 25 is inflated quickly and reliably toward the rear.

  The expansion of the filter bag body 25 is supported by the back surface portion 31a hitting the partition 5 while the lower part of the filter bag body 25 is supported by the bottom rib 7 and the upper part of the filter bag body 25 hits the lid rib 12. Limited by being supported. Thereby, the filter bag body 25 is expanded into a predetermined shape. The state in which the dust bag 21 is inflated in this manner is shown in FIGS. 1 and 2, and is indicated by a two-dot chain line in FIGS. 4 and 5.

As described above, as the filter bag body 25 expands, the upper and lower portions of the first filter member 26 are pulled obliquely rearward as indicated by a two-dot chain line in FIG. Accordingly, the bonding portion 35 is bent in a substantially semicircular arc shape, but is not crushed, so that a large load is not applied to the bonding portion 35. On the other hand, when the pair of gusset portions 31b are provided in the first filter member 26, an adhesive portion is formed at the F portion in FIG. It is deformed so that it buckles with expansion. Therefore, it cannot be denied that an excessive load is applied to the bonding portion 35 provided in the F portion, and the F portion is also a portion where the wind pressure acts strongly. Therefore, if there is an adhesion failure in the F part, there is a possibility that the filter bag body 25 may fall from there. However, such a fear can be solved in the dust bag 21.

  In the state where the dust bag 21 is set, the dust sucked into the dust bag 21 together with the air as the electric blower 8 is driven is filtered by the filter bag body 25 and separated from the air. Accumulated. At the same time, the air separated from the dust and passing through the filter bag body 25 flows around the filter bag body 25, is sucked into the electric blower 8 through the slit 5 a of the support plate 5, and further outside the electric blower 8. Is discharged to the outside through the exhaust part of the cleaner body 2.

  In the dust collection by the dust bag 21 as described above, the second filter member 31 is formed of three layers of filter media 32 to 34 in the thickness direction, and dust is collected by these three layers of filter media 32 to 34. Can be filtered with a filter medium suitable for the size, it has good air permeability per unit area and is not easily clogged. Although the air permeability is good here, the air permeability is lower than the air permeability of the first filter member 26. Furthermore, since the inner filter medium 32 of the second filter member 31 is subjected to needle punching, it is suitable for capturing relatively large dust. On the other hand, since the air permeability of the intermediate filter medium 34 and the outer filter medium 33 of the second filter member 31 is lower than that of the inner filter medium 32, the second filter member 31 is suitable for capturing fine dust that has passed through the inner filter medium 32.

  As the use period of the dust bag 21 becomes longer, the clogging of the second filter member 31 proceeds, and accordingly, the amount of air passing through the second filter member 31 decreases. When the clogging progresses to some extent, the airflow sucked into the filter bag body 25 is reflected mainly toward the front side by the back surface portion 31a.

However, the dust bag 21 includes the first filter member 26 on the front side of the second filter member 31 having the back surface portion 31a. Therefore, in the state where the clogging of the second filter member 31 has progressed and the airflow reflected toward the front side at the back surface portion 31a has increased, the air in the filter bag body 25 mainly passes through the first filter member 26. To pass. Since the air permeability of the first filter member 26 is better than the air permeability of the second filter member 31 as described above, the progress of clogging of the first filter member 26 is caused by the second filter member 31. Slower than the progress of clogging. Thereby, since the filter bag body 25 as a whole is prevented from being clogged relatively early, the dust collection bag 21 can be used for a long time.

  Furthermore, since the filter bag body 25 is formed by bonding the peripheral portions of the first filter member 26 and the second filter member 31 by heat fusion, that is, by welding, the adhesive is used. Compared with the formed bonded portion, the bonded portion 35 requires only a narrow width of about several mm, and can be securely bonded. Therefore, as the filtration area of the filter bag body 25 can be secured, the progress of clogging of the filter bag body 25 can be delayed. Also in this respect, the filter bag body 25 is unlikely to be clogged in a short time, and thus the dust bag 21 can be used for a long time.

  In addition, the second filter member 31 is not only thicker than the first filter member 26, but the inner filter medium 32 is thicker than the other filter medium and is substantially raised, so that the inner filter medium 32 is formed as described above. In addition to capturing coarse dust, fine dust can also be captured within the thickness of the inner filter medium 32. Therefore, the amount of fine dust sprayed on the back surface portion 31a of the second filter member 31 is reflected to the front side and is captured by the first filter member 26, and accordingly, the eyes of the first filter member 26 are reduced. Since the progress of clogging can be delayed, the dust bag 21 can be used for a long time also in this respect.

  In addition, as described above, the air permeability of the entire filter bag body 25 can be improved regardless of the progress of clogging of the second filter member 31, which has lower air permeability than the first filter member 26. Therefore, the amount and speed of the airflow that passes through the filter bag body 25 and is sucked into the electric blower 8 can be suppressed from being greatly reduced. Therefore, the function of compressing the dust collected in the filter bag body 25 by the suction airflow can be maintained for a long period of time, and accordingly, more dust can be stored in the filter bag body 25.

  As described above, according to the dust bag 21 having the above-described configuration, the filter bag body 25 can be used for a long time while preventing the filter bag body 25 from being clogged at an early stage while ensuring the dust collection property at the back surface portion 31a. At the same time, a larger amount of dust separated by filtration can be stored.

  FIG. 6 shows another embodiment of the present invention. Since the dust collection bag of this other embodiment is the same as the dust collection bag described in the embodiment except for the matters described below, the same components as those in the embodiment are denoted by the same reference numerals as those in the embodiment. The description is omitted.

  The first filter member 26 of the dust bag 21 of another embodiment is a composite product of an inner filter medium 27 made by a melt blown method and an outer filter medium 28 made by a spunbond method, as in the embodiment. . On the other hand, the second filter member 31 is made of a polyester non-woven fabric subjected to needle punching, is thicker than other filter media, and has an almost raised state, and is made by a melt blown method. This is a two-layer structure of the outer filter medium 33 sprayed directly on the outer surface of the inner filter medium 32. The outer filter medium 33 has lower air permeability and higher dust collection than a filter medium made by the spunbond method. Therefore, the air permeability of the first filter member 26 is higher than the air permeability of the second filter member 31 that is thicker than this. Among the filter media 32 and 33 forming the second filter member 31, the inner filter media 32 facing the inner space of the filter bag body 25 is formed of a material different from the filter media 27 and 28 forming the first filter member 26. ing. Since the dust collecting property of the inner filter medium 32 is higher than the dust collecting properties of the filter media 27 and 28 forming the first filter member 26, the dust collecting property of the second filter member 31 having the inner filter medium 32 is the first. This is higher than the dust collection property of the filter member 26.

  Except for the matters described above, the configuration is the same as that of the embodiment including a configuration not shown. Therefore, according to the dust collection bag 21 of this other embodiment, for the reason already described in the embodiment, the problem of the present invention is solved and the dust collection property at the back surface portion 31a of the filter bag body 25 is achieved. In addition, the filter bag body 25 can be used for a long time while being blocked, and a larger amount of dust separated by filtration can be stored. Furthermore, in the other embodiment shown in FIG. 6, the second filter member 31 is also made of the filter medium combined in two layers, so that the number of layers of the filter medium constituting the filter bag body 25 can be reduced. Accordingly, it is preferable in that the filter bag body 25 can be easily folded and the filter bag body 25 can be smoothly and quickly expanded by the suction airflow.

  DESCRIPTION OF SYMBOLS 21 ... Dust collection bag, 23 ... Support plate, 24 ... Dust passage hole, 25 ... Filter bag body, 26 ... First filter member, 27 ... Inside filter medium of the first filter member, 28 ... First filter member Outer filter medium, 31... Second filter member, 31 a... Back surface portion of second filter member, 31 b. Gusset part, 32. Inner filter medium of second filter member, 33. ... Intermediate filter medium of second filter member, 35 ... Adhesion part

Claims (7)

In a dust collection bag in which a breathable filter bag body is fixed to the back surface of a support plate having a dust passage hole, the filter bag body includes a first filter member fixed to the support plate, and the filter bag body. The first filter member and the first filter member are bonded to the peripheral portion of the first filter member and have a back surface portion disposed so as to face the back surface of the support plate in a bulging state. 2 filter members, wherein the first filter member has a quadrangular shape larger than the support plate, and the second filter member has a quadrangular shape substantially the same size as the first filter member. The back surface portion formed, and at least a pair of gusset portions that are integrally continuous with the back surface portion and folded so as to approach each other from the back surface portion, and the gusset portion on the inner surface of the first filter member Said to face the first, together with the peripheral portion of the second filter member is bonded, an electric vacuum air permeability of the first filter member may be higher than the air permeability of the second filter member Dust bag for machine.   2. The dust collector for a vacuum cleaner according to claim 1, wherein both the filter members are made of a filter medium made of a thermoplastic chemical fiber, and the peripheral portions of the filter members are bonded together by welding. bag.   The dust collecting bag for an electric vacuum cleaner according to claim 1 or 2, wherein the number of layers of the filter medium forming the first filter member is smaller than the number of layers of the filter medium forming the second filter member.   The second filter member is formed of two or more layers of filter medium, and the filter medium that faces the internal space of the filter bag body among these filter mediums is the inner part of the filter medium that forms the first filter member. The filter medium is formed of a material different from the filter medium facing the internal space of the filter bag body, and the filter medium has a higher dust collection performance than the filter medium forming the first filter member. The dust bag for an electric vacuum cleaner according to claim 3.   The second filter member is formed of two or more layers of filter medium, and the filter medium facing the inner space of the filter bag body among these filter mediums is thicker than the filter medium on the outer side and has a dust collection property. The dust bag for a vacuum cleaner according to any one of claims 1 to 3, wherein the dust bag is high. The vacuum cleaner according to any one of claims 1 to 5, wherein at least one of the deodorizing material or the antibacterial material is impregnated or applied to at least a part of the filter bag body. Dust bag for use. The dust bag for an electric vacuum cleaner according to claim 6 , wherein at least one of a deodorizing material or an antibacterial material is impregnated or applied to the first filter member .

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