JP2005248934A - Duct fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct fan comprising two double-suction type blowers compactly contained to improve blow efficiency in which parts replacement and inspection can be performed to the second blower in the depth from an opening part for maintenance when necessary to solve problems related to maintenance. <P>SOLUTION: In this ventilation device, a flow passage formed in a box-shaped casing having an intake port and a discharge port in a straight line from the intake port to the discharge port is parted to a first ventilation passage and a second ventilation passage, blowers each provided with a motor, a runner, and a fan casing are respectively provided on the ventilation passages, and the opening part for maintenance is provided in a side surface plate in the casing on the side of the second ventilation passage. The first blower on the side of the first ventilation passage can be installed or removed from the opening part for maintenance without removing the second blower. A flow changing plate is provided in a ventilation intake passage on a side plate of the fan casing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a duct fan in which two blowers are installed in a space such as the back of a ceiling of a building and ventilate by exhausting indoor air from the room to the outside through a duct.

  The present invention also relates to the structure of a duct fan that improves the suction characteristics of the blower and increases the blowing efficiency.

As shown in FIG. 5, a conventional duct fan 101 is a main body casing, which is composed of two pairs of side plates 102 facing each other and an upper plate and a lower plate, and one of the side plates 102 is connected to an absorption duct 103 for suction. A port 104 is provided, and the other side is provided with a discharge port 106 for connecting a discharge duct 105. A partition plate 108 having an opening 107 separates the side plate 102 on the suction port 104 side and the side plate 102 on the discharge port 106 side of the main body casing 101, and the partition plate 108 and the partition plate 108 A plurality of blowers 111 whose positions are determined by aligning the outlet 110 of the partition plate 108 with the opening 107 of the partition plate 108 are arranged in parallel with the position regulating member 109 provided on the side plate 102 side of the suction port 104 side. It is fixed to. The plurality of blowers 111 can be removed sequentially from the front by removing one side plate 102 of the main casing 101 and removing the position regulating member 109 (see, for example, Patent Document 1).
No. 4-44982

  In such a conventional duct fan, the plurality of fans 111 can be sequentially removed from the front by removing one side plate 102 of the main casing 101 and removing the position regulating member 109. Since the plurality of blowers 111 are arranged in parallel between the plate 108 and the position restricting member 109 provided on the side plate 102 on the suction port 104 side of the partition plate 108, the side plate 102 Even when it is necessary to replace and inspect only the second blower far from the maintenance opening provided on the side, it is necessary to remove the blower sequentially from the front, and both blowers must be removed. There is a problem that it takes time and labor.

  Further, since the main casing 101 has a small space for mounting on the ceiling, it is difficult to install and maintain the main casing 101, so that the main casing 101 is required to be compact.

  In addition, there is a demand for a duct fan that incorporates two suction-type blowers in a compact manner and has improved air blowing efficiency.

  On the other hand, there is a demand for a duct fan in which one double-suction blower and one single-suction blower are housed in a compact manner and the air blowing efficiency is improved.

  Therefore, the present invention is to solve such a conventional problem, and an object of the present invention is to provide a duct fan having a compact structure in which two fans can be taken out individually.

  It is another object of the present invention to provide a duct fan which has two suction blowers in a compact manner and which has improved air blowing efficiency.

  On the other hand, an object is to provide a duct fan that has one double-suction fan and one single-suction fan in a compact manner and has improved blowing efficiency.

  According to the first aspect of the present invention, a flow path that flows linearly from the suction port to the discharge port is provided in a box-shaped housing having a suction port and a discharge port. A duct having partition walls divided into roads, each provided with a fan motor unit and a fan casing in each ventilation path, and provided with a maintenance opening on the side plate of the casing on the second ventilation path side The fan is characterized in that it has a detaching means for detaching the first blower on the first ventilation path side from the maintenance opening without removing the second blower.

  According to a second aspect of the present invention, in the duct fan according to the first aspect, the detaching means has a detachable partition plate in a partition wall partitioned into a first ventilation path and a second ventilation path. And

  According to a third aspect of the present invention, in the duct fan according to the second aspect, the detaching means removes the maintenance plate and then removes the partition plate to detach the entire first blower.

  The duct fan according to claim 4 is characterized in that in the duct fan according to claim 2, the detaching means removes the maintenance plate and then removes the partition plate to detach the fan motor unit of the first blower. To do.

  According to the fifth aspect of the present invention, in the box-shaped housing having the suction port and the discharge port, the flow path that flows linearly from the suction port to the discharge port is divided into the first ventilation path and the second ventilation path. A duct having partition walls divided into roads, each provided with a fan motor unit and a fan casing in each ventilation path, and provided with a maintenance opening on the side plate of the casing on the second ventilation path side Arrangement of the first and second fans, which is a fan and removes the first fan motor unit on the first ventilation path side from the maintenance opening without removing the second blower, is a suction port of the housing The fan casing of the second blower is positioned so as to overlap between the end of the fan casing of the first blower and the end of the orifice on the side.

  According to the sixth aspect of the present invention, the flow path that flows linearly from the suction port to the discharge port is provided in a box-shaped housing having a suction port and a discharge port. A duct having partition walls divided into roads, each provided with a fan motor unit and a fan casing in each ventilation path, and provided with a maintenance opening on the side plate of the casing on the second ventilation path side Arrangement of the first and second fans, which is a fan and removes the first fan motor unit on the first ventilation path side or the first fan from the maintenance opening without removing the second fan, The fan casing of the second blower is positioned so as to overlap the scroll width sandwiched between the fan casing side plates of the fan casing of the first blower.

  A seventh aspect of the present invention is the duct fan according to the fifth or sixth aspect, wherein the partition wall divided into the first ventilation path and the second ventilation path has a detachable partition plate. To do.

  According to an eighth aspect of the present invention, in the duct fan according to the first to seventh aspects, the maintenance opening has an integrated maintenance opening that serves as an opening for taking out the second blower and the first blower. And

  According to a ninth aspect of the present invention, in the duct fan according to the first to seventh aspects, the maintenance opening has an individual maintenance opening provided with an opening for individually taking out the blower.

  In the tenth aspect of the present invention, a flow path that linearly flows from the suction port to the discharge port is provided in a box-shaped housing having a suction port and a discharge port. Each of the fan casing side plates has a partition wall divided into roads, and is provided with a fan motor unit and a fan casing in each ventilation path. A fan casing side plate in a duct fan in which the fan casing of the second suction fan on the second airflow path overlaps with the sandwiched scroll width and has a fan suction port on the side opposite to the motor of the second suction fan. The airflow suction path is provided with a current plate formed in a protruding shape that suppresses the wall surface flow along the fan casing side plate and increases the suction flow component in the direction of the impeller central axis of the fan suction port. That.

  The present invention according to claim 11 is a double-suction system in which a box-shaped housing having a suction port and a discharge port is provided with a fan motor unit and a fan casing in an air passage that flows linearly from the suction port to the discharge port. Duct fan provided with an air blower, and a fan intake opening impeller that suppresses the wall surface flow along the fan casing side plate in the ventilation intake path of the fan casing side plate having fan suction openings on the opposite motor side of both suction blowers The present invention is characterized in that a current-transforming plate formed in a protruding shape that increases the suction flow component in the direction of the central axis is provided.

  The present invention as set forth in claim 12 is a single suction device comprising a box-shaped housing having a suction port and a discharge port, and a fan motor unit and a fan casing provided in a straight air passage extending from the suction port to the discharge port. Duct fan provided with an air blower, and a fan intake side of a fan casing side plate having a fan suction port on the side opposite to the motor of a single suction type blower. The present invention is characterized in that a current-transforming plate formed in a protruding shape that increases the suction flow component in the axial direction is provided.

  According to a thirteenth aspect of the present invention, in the duct fan according to any one of the tenth to twelfth aspects, the current transformer plate includes a fan suction port of the impeller and a scroll wall of the blower close to the housing suction port. It is arranged between them.

  According to a fourteenth aspect of the present invention, in the duct fan according to the tenth to thirteenth aspects, a sound absorbing material is provided on the current transformer plate.

  According to a fifteenth aspect of the present invention, in the duct fan according to the tenth to thirteenth aspects, the current transformer plate is made of a sound absorbing material.

  According to a sixteenth aspect of the present invention, in the duct fan according to the tenth to fifteenth aspects, the current transformer plate is formed integrally with a sound absorbing material provided on the scroll wall of the blower near the housing suction port on the suction side of the blower. It is characterized by that.

  As is apparent from the above description, according to the present invention, the casing is divided into a first ventilation path and a second ventilation path, and a blower including a motor, an impeller, and a fan casing is provided in each ventilation path. In the case of taking out the first blower with a duct fan provided with a maintenance opening on the lateral side plate of the housing on the second ventilation path side, the first blower is removed after removing the second blower. By adopting a structure that can be individually taken out from the maintenance opening, even if it is necessary to replace and inspect only the second blower behind the maintenance opening, the fan far from the maintenance opening can be individually Therefore, it is easy to exchange parts and confirm functions, and it is possible to improve the efficiency of maintenance.

  It is another object of the present invention to provide a duct fan which has a small ceiling mounting space and is compact in size and can be easily installed and maintained.

  From the above, a duct fan that takes into consideration workability and maintainability on a narrow ceiling is provided.

  Moreover, since airflow can be attracted in the direction of the impeller central axis of the fan suction port, the fan characteristics can be ensured in an optimum operating state.

  1st Embodiment of this invention has the partition partition which divided the flow path which flows linearly from a suction inlet to a discharge outlet into the 1st ventilation path and the 2nd ventilation path, and each ventilation path A fan provided with a fan motor unit and a fan casing respectively, and a duct fan provided with a maintenance opening in the side plate of the casing on the second ventilation path side, when taking out the first blower, It was set as the structure which can take out a 1st air blower separately from the said maintenance opening part after removing a 2nd air blower.

  According to a second embodiment of the present invention, in the duct fan according to the first embodiment, the detaching means includes a partition plate that can be attached to and detached from a partition wall partitioned into a first ventilation path and a second ventilation path. And a means that can be detached by providing an opening necessary for taking out the blower or impeller and the motor.

  In the duct fan according to the second embodiment, the third embodiment of the present invention removes the maintenance plate from the side plate of the casing on the second ventilation path side, and then removes the partition plate, Means for removing the entire blower.

  In the duct fan according to the second embodiment, the fourth embodiment of the present invention removes the maintenance plate from the side plate of the casing on the second ventilation path side, and then removes the partition plate, Means for attaching and detaching the impeller and motor of the blower are provided.

  In the fifth embodiment of the present invention, a blower having a partition wall divided into a first ventilation path and a second ventilation path in a casing, and a fan motor unit and a fan casing in each ventilation path. The first fan motor unit on the first ventilation path side without being removed from the second fan, the duct fan having a maintenance opening on the side plate of the casing on the second ventilation path side provided on each side The first and second blowers are arranged between the maintenance opening and the fan casing of the second blower between the fan casing end and the orifice end of the first blower on the suction port side of the housing. It is set as the structure which shortens the distance of a ventilation path by overlapping and positioning.

  The sixth embodiment of the present invention includes a partition wall that divides a ventilation path into a first ventilation path and a second ventilation path, and includes a fan equipped with a fan motor unit and a fan casing in each ventilation path. The first fan motor unit on the first ventilation path side without being removed from the second fan, the duct fan having a maintenance opening on the side plate of the casing on the second ventilation path side provided on each side Alternatively, the arrangement of the first and second blowers for detaching the first blower from the maintenance opening is such that the second blower has a scroll width sandwiched between the fan casing side plates of the fan casing of the first blower. In order for the fan casings to overlap each other, a step partition wall connecting the first partition wall and the second partition wall is used to reduce the width of the ventilation path.

  The seventh embodiment of the present invention is a duct fan according to the fifth and sixth embodiments, wherein a partition wall partitioned into a first ventilation path and a second ventilation path has a removable partition plate. The configuration.

  According to an eighth embodiment of the present invention, in the duct fan according to the first to seventh embodiments, the maintenance opening is an integrated maintenance opening that is an opening for taking out the second blower and the first blower. It is set as the structure which has.

  According to a ninth embodiment of the present invention, in the duct fan according to the first to seventh embodiments, the maintenance opening has an individual maintenance opening provided with an opening for individually taking out the blower. .

  In the tenth embodiment of the present invention, the fan suction port is configured by suppressing the wall surface flow along the fan casing side plate in the ventilation suction path of the fan casing side plate having the fan suction port on the side opposite to the motor of the second double suction fan. It is set as the structure which provided the current plate formed in the protrusion shape which increases the suction | inhalation flow component of the direction of an impeller central axis of this. Thereby, since an air current can be attracted in the direction of the impeller central axis of the fan suction port, the fan characteristics can be ensured in an optimum operating state.

  In the eleventh embodiment of the present invention, the fan suction port impeller is configured by suppressing the wall surface flow along the fan casing side plate in the ventilation suction path of the fan casing side plate having the fan suction port on the side opposite to the motor of both suction fans. It is set as the structure which provided the current plate formed in the protrusion shape which increases the suction flow component of the direction of a central axis. Thereby, even if both suction type fans are arranged at a position where the configuration is compact, air current can be attracted in the direction of the impeller central axis of the fan suction port, so that the fan characteristics can be ensured in an optimum operating state.

  In the twelfth embodiment of the present invention, the air suction path of the fan casing side plate having the fan suction port on the side opposite to the motor of the single suction blower suppresses the wall surface flow along the fan casing side plate and the impeller center of the suction port. It is set as the structure which provided the current plate formed in the shape of a protrusion which increases the suction | inhalation flow component of the direction of an axis | shaft. Thereby, even if the single-suction type blower is arranged at a position having a compact configuration, the air current can be attracted in the direction of the impeller central axis of the fan suction port, so that the fan characteristics can be ensured in an optimum operating state.

  According to a thirteenth embodiment of the present invention, in the duct fan according to the tenth to twelfth embodiments, the current transformer plate includes a fan suction port of the impeller and a scroll wall of the blower close to the housing suction port. It is set as the structure arrange | positioned between. Thereby, since an air current can be attracted in the direction of the impeller central axis of the fan suction port, the fan characteristics can be ensured in an optimum operating state.

  In the fourteenth embodiment of the present invention, in the duct fan in the tenth to thirteenth embodiments, a current absorbing plate is provided with a sound absorbing material. Thereby, while attracting | sucking an air current in the direction of the impeller center axis | shaft of a fan inlet, the noise which generate | occur | produces from a fan inlet can be reduced.

  According to a fifteenth embodiment of the present invention, in the duct fan according to the tenth to thirteenth embodiments, the current transformer plate is made of a sound absorbing material. Thereby, a current-transforming effect and a sound-absorbing effect can be performed with the sound-absorbing material alone.

  According to a sixteenth embodiment of the present invention, in the duct fan according to the tenth to fifteenth embodiments, the current transformer plate is a sound absorbing material provided on the scroll wall of the blower near the suction inlet of the blower. It is set as the structure formed integrally with. Thereby, since it can unite with the sound-absorbing material of the scroll wall of an air blower, attachment man-hour becomes easy.

  Embodiments of the present invention will be described below with reference to the drawings.

(Example 1)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing an installation state of Embodiment 1 of the present invention, and FIG. 2 is a plan sectional view of Embodiment 1 of the present invention. As shown in FIG. 2, a first blower 6 and a second blower 7 having a suction adapter 3 at the suction port 2 of the housing 1 and a discharge adapter 5 at the discharge port 4 are built in. The inside of the housing 1 has a partition wall 10 that divides a flow path that flows linearly from the suction port 2 to the discharge port 4 into a first ventilation path 8 and a second ventilation path 9. Each air passage is provided with a fan motor unit 14 having an impeller 11, a motor 12 and an orifice 13, and a fan casing 15. The second blower 7 disposed in the second ventilation path 9 includes a side plate 17 and a partition wall 10 that attach a maintenance plate 16 that covers the maintenance opening 61 in the vicinity of the suction port 2 of the housing 1. The fan discharge port 18 of the second blower 7 is disposed toward the discharge port 4 of the housing 1. The fan discharge port plate 19 divides the second ventilation path 9 between the discharge port 4 and the suction port 2 of the housing 1 and forms a chamber portion 20 on the discharge port 4 side.

  On the other hand, the first blower 6 disposed in the first ventilation path 8 is provided between the anti-maintenance side plate 21 opposite to the side plate 17 to which the maintenance plate 16 of the housing 1 is attached and the partition wall 10. The fan discharge port 18 of one blower 6 is attached to the discharge side plate 22 toward the discharge port 4 of the housing 1. The partition wall 10 has an opening 23 larger than the fan casing 15 of the first blower 6, and a partition plate 24 that covers the opening 23 is attached with screws. Further, the arrangement relationship between the first blower 6 and the second blower 7 is such that the fan casing end 25 of the first blower 6 on the suction port 2 side of the housing 1 and the fan discharge port plate of the second blower 7. 19 is configured not to overlap.

  In the above configuration, when the duct fan is operated, the first blower 6 and the second blower 7 built in the housing 1 are operated, and the air in the room 26 passes through the suction adapter 3 connected to the suction side duct 27 and passes through the housing. It is exhausted to the outdoor 29 through a discharge duct 28 connected to the discharge adapter 5 through the body 1.

  Here, when removing the second blower 7 during maintenance of the duct fan, the maintenance plate 16 can be removed and removed. When the first blower 6 in the first ventilation path 8 is removed, the maintenance plate 16 is first removed, then the partition plate 24 in the partition wall 10 is removed, and the opening 23 and the maintenance opening. Remove from 61 to the outside of the housing 1. At this time, the first blower 6 and the second blower 7 can be taken out separately because the first blower 6 and the second blower 7 do not interfere with each other when the first blower 6 is removed. This is because the position of the fan casing 15 is shifted, so that the first blower 6 can be removed from the maintenance opening 61 without removing the second blower 7.

  Moreover, when attaching, it can carry out by the reverse operation | work.

  The arrangement of the second blower 7 may not be in the vicinity of the suction port 2 of the housing 1.

  Further, the partition wall 10 may not be connected to the suction port 2.

(Example 2)
In the second embodiment, in contrast to the first embodiment, when only the fan motor unit 14 of the first blower 6 is taken out, the second blower 7 is disposed at a position where the second blower 7 is not interfered with, and reaches from the suction port 2 to the discharge port 4. The distance of the flow path that flows linearly is shortened, that is, the length of the housing 1 is made compact.

  FIG. 3 is a plan sectional view of Embodiment 2 of the present invention. As shown in FIG. 3, the arrangement of the first blower 6 and the second blower 7 is such that the fan casing end 25 of the first blower 6 and the orifice end of the fan motor unit 14 on the suction port 2 side of the housing 1. Between the part 31, the 2nd air blower 7 is arrange | positioned in the position where the fan discharge port plate 19 overlapped.

  Here, when only the fan motor unit 14 of the first blower 6 in the first ventilation path 8 is removed during the maintenance of the duct fan, the maintenance plate 16 is first removed, and then the partition in the partition wall 10 is separated. The plate 24 is removed and removed from the opening 23 and the maintenance opening 61 to the outside of the housing 1. At this time, the first blower 6 and the second blower 7 can be taken out separately because the first blower 6 and the second blower 7 do not interfere with each other when the first blower 6 is removed. This is because the position of the fan casing 15 is shifted, so that the first blower 6 can be detached from the maintenance opening without removing the second blower 7.

(Example 3)
The third embodiment has a configuration in which the width of the flow path that flows linearly from the suction port 2 to the discharge port 4 is narrower than that of the first embodiment, that is, the width of the housing 1 is made compact. 4 is a plan sectional view of Embodiment 3 of the present invention.

  As shown in FIG. 4, the fan motor unit 14 of the first blower 6 on the first ventilation path 8 side or the first blower 6 is removed from the maintenance opening 61 without removing the second blower 7. At this time, the first and second blowers are arranged such that the fan casing 15 of the second blower 7 overlaps the scroll width 42 sandwiched between both fan casing side plates 41 of the fan casing 15 of the first blower 6. The configuration is as follows. For this reason, the first flow path 8 and the second flow path 9 are separated from the first blower 6 in the linear flow path from the suction port 2 to the discharge port 4. The first partition 44 located on the second ventilation path 9 side from the center line 43 of the suction port and the discharge port, and the first ventilation from the center line 43 of the housing 1 facing the second blower 7. The second partition 45 disposed on the side of the road 8 is divided by a step partition 46 connecting the first and second partitions. Due to this partition structure, even if the distance between the first and second blowers is narrowed, the flow of wind can be made smooth to reduce the air path resistance, and the air blowing characteristics can be ensured. Thereby, the width | variety of the housing | casing 1 can be made narrow and compact.

  Here, when removing the first blower 6 in the first ventilation path 8 during maintenance of the duct fan, first, the maintenance plate 16 is removed, and then the partition plate 24 in the partition wall 10 is removed. The opening 23 and the maintenance opening 61 can be removed from the housing 1.

Example 4
The fourth embodiment is different from the third embodiment in that a current-transforming plate 56 that changes the flow of airflow at the fan inlet 51 is provided. Therefore, the same reference numerals are used for the same parts as those in the third embodiment, and description thereof is omitted. Although the blower in Example 3 includes a double suction type blower and a single suction type blower, the blower in Example 4 is a double suction type blower. FIG. 6 is a plan sectional view of Embodiment 4 of the present invention.

  As shown in FIG. 6, in the second ventilation path 9, the scroll wall 54 is provided in the ventilation suction path 53 of the fan casing side plate 52 having the fan suction port 51 on the opposite motor side of the second suction fan 50. It is the structure which provided the rectangular-shaped current transformation board 56 which protrudes from the edge part 55 by the side of the fan inlet 51 of this, and interrupts | blocks a flow path.

  In this configuration, the air flowing in from the suction port 2 hits the scroll wall 54 and the rectangular current transformer plate 56, so that the air flows over the current transformer plate 56 and flows in the direction of the impeller center shaft 57 of the fan suction port 51. Therefore, the fan characteristics can be ensured in an optimum operating state. This is because when the wall surface flow along the fan casing side plate 52 flows in from the fan suction port 51, the incident angle of the suction airflow becomes smaller with respect to the fan impeller, and the fan efficiency is reduced. Therefore, if the flow of the wind is changed so as to suppress the flow of the wall surface flow and flow in the direction of the impeller central axis 57 of the fan suction port 51, the airflow can be induced in the direction of the impeller central axis of the fan suction port 51. As a result, fan efficiency can be increased.

(Example 5)
The fifth embodiment is different from the fourth embodiment in that the two suction fans 50 are changed from two to one, and the other configurations and functions are the same as those of the fourth embodiment. Therefore, the same reference numerals are used for the same portions as those in the fourth embodiment, and the description thereof is omitted. FIG. 7 is a plan sectional view of Embodiment 5 of the present invention.

  As shown in FIG. 7, the air suction passage 53 of the fan casing side plate 52 having the fan suction port 51 on the side opposite to the motor of the both suction type blower 50 protrudes from the end portion 55 of the scroll wall 54 on the fan suction port 51 side. It is set as the structure which provided the rectangular current plate 56 which interrupts | blocks a flow path. In other words, the current plate 56 formed in a protruding shape prevents the wall surface flow along the fan casing side plate 52 and induces the suction flow in the direction of the impeller central shaft 57 of the fan suction port 51, so that the fan characteristics are optimized. It can be secured in the operating state. Conventionally, the housing 1 can be made compact with respect to the suction port 60 matched with the dimension of the suction side duct 27. That is, the conventional suction flow hits the scroll wall 54 and flows in the direction of the impeller central shaft 57 of the fan suction port 51 beyond the scroll wall 54. If the width in the direction perpendicular to the flow path of the housing 1 is reduced in this state, the position of the scroll wall 54 is lowered with respect to the suction port 60, and the suction flow does not hit the scroll wall 54. Look for it. Therefore, the fan efficiency is improved by providing the current changing plate 56 and changing the flow of the wind so as to flow in the direction of the impeller central shaft 57 of the fan suction port 51.

(Example 6)
The sixth embodiment is different from the fifth embodiment in that both suction fans 50 are replaced with a single suction fan 71, and the other configurations and functions are the same as those in the fifth embodiment. Accordingly, the same parts as those in the fifth embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 8 is a plan sectional view of Example 6 of the present invention.

  As shown in FIG. 8, a fan suction side 53 of a fan casing side plate 52 having a fan suction port 51 on the side opposite to the motor of the single suction blower 71 protrudes from an end portion 55 of the scroll wall 54 on the fan suction port 51 side. It is set as the structure which provided the rectangular current plate 56 which interrupts | blocks a flow path. That is, the current plate 56 formed in a protruding shape prevents the wall surface flow along the fan casing side plate 52 and induces the suction flow in the direction of the impeller central shaft 57 of the fan suction port 51, so that the fan characteristics Can be ensured in an optimum operating state.

(Example 7)
The seventh embodiment is different from the fourth embodiment in that a sound absorbing material 72 is provided on the current transformer plate 56 and the sound absorbing material 72 is used in place of the current transformer plate 56. Same as Example 4. Therefore, the same reference numerals are used for the same portions as those in the fourth embodiment, and the description thereof is omitted. FIG. 9 is a plan cross-sectional view of Embodiment 7 of the present invention, and FIG.

  As shown in FIG. 9, a sound absorbing material 72 is provided on a rectangular current plate 56. As a result, the suction noise from the fan can be absorbed by the sound absorbing material 72. Further, as shown in FIG. 10, the scroll wall 54 is provided with a sound absorbing material A73 in order to reduce the suction noise from the fan, and the sound absorbing material A73 attached to the current transformer plate 56 is integrated with the scroll wall 54. To do. As a result, simplification at the production stage and reduction of man-hours at the assembly stage can be achieved.

  The present invention can also be applied to exhaust.

The side view which shows the installation state of Example 1 of this invention Plan sectional drawing of Example 1 of this invention Plan sectional drawing of Example 2 of this invention Plan sectional drawing of Example 3 of this invention Plan view of a conventional duct fan Plan sectional drawing of Example 4 of this invention Plan sectional drawing of Example 5 of this invention Plan sectional drawing of Example 6 of this invention Plan sectional drawing of Example 7 of this invention Thermal insulation attachment situation diagram of Example 7 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Suction port 4 Discharge port 6 1st air blower 7 2nd air blower 8 1st ventilation path 9 2nd ventilation path 10 Partition partition 14 Fan motor unit 15 Fan casing 16 Maintenance plate 17 Side plate 24 Partition Plate 25 Fan casing end portion 31 Orifice end portion 41 Fan casing side plate 42 Scroll width 43 Center line 44 First partition 45 Second partition 46 Step partition 50 Double suction fan 51 Fan suction port 52 Fan casing side plate 53 Ventilation suction passage 54 Scroll Wall 55 End portion 56 Current transformer plate 57 Impeller central axis 60 Suction port 61 Maintenance opening
71 Single suction blower 72 Sound absorbing material 73 Sound absorbing material A

Claims (16)

A box-shaped housing having a suction port and a discharge port has a partition wall that divides a linear flow path from the suction port to the discharge port into a first ventilation path and a second ventilation path. A duct fan provided with a fan motor unit and a fan casing in each ventilation path, respectively, and provided with a maintenance opening in the side plate of the casing on the second ventilation path side, the second blower A duct fan, comprising: a detaching means for detaching the first blower on the first ventilation path side from the maintenance opening without removing the first fan. 2. The duct fan according to claim 1, wherein the detaching means has a detachable partition plate in a partition wall divided into a first ventilation path and a second ventilation path. The duct fan according to claim 2, wherein the detaching means removes the maintenance plate and then removes the partition plate to detach the entire first blower. The duct fan according to claim 2, wherein the detaching means removes the maintenance plate, then removes the partition plate, and detaches the fan motor unit of the first blower. A box-shaped housing having a suction port and a discharge port has a partition wall that divides a linear flow path from the suction port to the discharge port into a first ventilation path and a second ventilation path. A duct fan provided with a fan motor unit and a fan casing in each ventilation path, respectively, and provided with a maintenance opening in the side plate of the casing on the second ventilation path side, the second blower The arrangement of the first and second blowers for removing the first fan motor unit on the first ventilation path side from the maintenance opening without removing the fan fan casing of the first blower on the inlet side of the housing A duct fan, characterized in that a fan casing of a second blower is overlapped between an end portion and an orifice end portion. A box-shaped housing having a suction port and a discharge port has a partition wall that divides a linear flow path from the suction port to the discharge port into a first ventilation path and a second ventilation path. A duct fan provided with a fan motor unit and a fan casing in each ventilation path, respectively, and provided with a maintenance opening in the side plate of the casing on the second ventilation path side, the second blower Without dismounting the first fan motor unit or the first blower on the first ventilation path side from the maintenance opening, the arrangement of the first and second blowers is arranged on the fan casing of the first blower. A duct fan characterized in that a fan casing of a second blower overlaps with a scroll width sandwiched between both fan casing side plates. The duct fan according to claim 5 or 6, further comprising a partition plate detachable on the partition wall divided into the first ventilation path and the second ventilation path. The duct fan according to any one of claims 1 to 7, wherein the maintenance opening has an integral maintenance opening that serves as an opening for taking out the second blower and the first blower. 8. The duct fan according to claim 1, wherein the maintenance opening has an individual maintenance opening provided with an opening for individually taking out the blower. A box-shaped housing having a suction port and a discharge port has a partition wall that divides a linear flow path from the suction port to the discharge port into a first ventilation path and a second ventilation path. , Each suction passage is provided with a fan motor unit and a fan suction unit provided with a fan casing, and the scroll width sandwiched between both fan casing side plates of the fan casing of the first suction fan In the duct fan in which the fan casings of the second both-suction type blower are overlapped, the fan casing side plate is provided in the ventilation suction path of the fan casing side plate having the fan suction port on the side opposite to the motor of the second both-suction type blower. A duct fan characterized in that it is provided with a current-transforming plate formed in a protruding shape that suppresses the wall surface flow along the fan shaft and increases the suction flow component in the direction of the impeller central axis of the fan suction port. A duct fan having a box-shaped housing having a suction port and a discharge port provided with a double suction fan provided with a fan motor unit and a fan casing in a straight air passage extending from the suction port to the discharge port. The suction flow component in the direction of the impeller central axis of the fan suction port is suppressed by suppressing the wall flow along the fan casing side plate in the ventilation suction path of the fan casing side plate having the fan suction port on the opposite motor side of both suction fans. A duct fan, characterized in that it is provided with a current-transforming plate formed in a protruding shape. There is a duct fan provided with a single-suction fan provided with a fan motor unit and a fan casing in a straight airflow path from the suction port to the discharge port in a box-shaped housing having a suction port and a discharge port. In the ventilation suction path of the side plate of the fan casing having the fan suction port on the side opposite to the motor of the single suction type blower, the wall surface flow along the fan casing side plate is suppressed to increase the suction flow component in the direction of the impeller central axis of the suction port. A duct fan comprising a current-transforming plate formed in a protruding shape. The duct fan according to any one of claims 10 to 12, wherein the current transformer plate is disposed between a fan suction port of the impeller and a scroll wall of the blower close to the housing suction port. . The duct fan according to any one of claims 10 to 13, wherein a sound absorbing material is provided on the current transformer plate. The duct fan according to any one of claims 10 to 13, wherein the current plate is made of a sound absorbing material. The duct fan according to any one of claims 10 to 15, wherein the current transformer plate is integrally formed with a sound absorbing material provided on a scroll wall of the blower close to a housing suction port on the suction side of the blower. .

Images