JP2008138555A - Blowing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily equalize an air capacity balance between two fan casings while facilitating maintenance of blowers, in a blowing device provided with two centrifugal double suction type blowers. <P>SOLUTION: In this blowing device having the same two centrifugal blowers 5 installed in parallel in a hexahedral main box body 2 provided with on its opposite sides a suction port 3 and a delivery port 4 for connecting a duct, and blowing off air sucked from the suction port 3 through the duct from the delivery port 4 to the duct, the two blowers 5 are formed as the double suction type having suction ports 7, 8 on a motor side and an anti-motor side in the fan casings 6, and both the suction ports 7 on the motor side are directed to the same direction, thereby the blowers are inspected from an inspection hole formed in one side of the main box body 2. The air capacity balance between the two blowers 5 is adjusted by differentiating between the opening areas of the suction ports of the blowers 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a blower that incorporates two centrifugal double-suction type blowers into a main body box and blows out air sucked from a suction port provided on the opposite side of the main body box from the discharge port. It is.

  There is a blower installed in a ceiling space of a building and the like, which sucks indoor air through a duct and exhausts it through the duct. This type of air blower is designed to convey a large amount of air and to make the device compact (reduced in height), and within a hexahedron body box with one suction port and one discharge port on the opposite side. For example, Patent Document 1 discloses a configuration in which two identical centrifugal double suction fans are installed in parallel.

JP 2005-248934 A

  The thing shown by patent document 1 is comprised so that a ventilation path may be rotationally symmetrical to a housing | casing so that two air blowers can be maintained individually from one direction one by one, and two air blowers may also be rotationally symmetrical. It is incorporated. Each motor mounting side of each blower faces one side of the housing, and any blower can be individually disassembled and assembled from an inspection port provided on one side of the housing. Such a configuration facilitates maintenance of each blower, but the length of the entire length from the suction port to the discharge port of the housing becomes longer because the two blowers do not overlap the projection plane on the inspection port side. Further, in the both-suction type blower, the motor blocks the air flow at the motor-side suction port and the counter-motor-side suction port. In particular, in the case of a large air volume provided with two fans, the motor interferes with the air path and the air volume balance flowing through the two fan casings is lost. Such an unbalance of air volume not only causes problems such as increased vibration and increased vibration noise, but also unbalances the motor load. The unbalance of the air volume can be adjusted by changing the air path structure of the main body box. However, this increases the number of parts and increases the size of the main body. Further, when the motor load is not well balanced, there is a problem that the temperature rises on the motor side with a large load.

  The present invention has been made in order to solve the above-described problems, and the problem is that it is easy to perform maintenance of a blower with respect to a blower device including two centrifugal and double suction blowers. It is to make it possible to easily equalize the air volume balance between the two fan casings while achieving this.

  In order to solve the above-mentioned problems, the present invention incorporates two identical centrifugal fans in parallel in a substantially hexahedral main body box having one suction port and one discharge port on the opposite side for connecting a duct. The air blower is configured to blow out air sucked from the suction port through the discharge port to the duct, and the two blowers have both suction ports on the motor side and the non-motor side in their fan casings. The suction side of the motor side is the same direction, and it is configured so that inspection can be performed from the inspection port provided on one side of the main body box, and the air volume balance of the two fans is A means for adjusting by providing a difference in the opening area of the outlet is adopted.

  According to the present invention, two fans can be maintained from one direction, and the air volume unbalance of the fan casing can be reduced regardless of the change of the air passage structure, thereby reducing the opening area of the air outlet on the side with the larger air volume. Can be balanced just by simple adjustments.

  The blower of the present invention is suspended and installed in a ceiling space of a building, sucks indoor air through a duct, and exhausts the air outside through the duct. On the opposite side of the main body box configured as a hexahedron, there are provided one suction port and one discharge port that can be connected to a duct. Two identical centrifugal fans are incorporated in the main body box in parallel, and the air sucked from the suction port is blown out from the discharge port into the duct through the duct. The two air blowers are both suction type with suction ports on the motor side and the non-motor side in their fan casings, and both of them are in the same direction (perpendicular to the line connecting the suction port and the discharge port) It can be inspected from an inspection port with a cover provided on one side of the main body box. The motor-side suction port disrupts the balance of the air flow flowing through the two fan casings because the motor obstructs the air path.

  Basically, the internal air passage width of the main body box has been studied while considering the air volume balance, but this does not mean that the air volume balance can be achieved. In the present invention, the exhaust adjustment plate provides a difference in the opening area of the outlets of the two blowers. Specifically, the exhaust adjustment plate has two adjustment openings at positions corresponding to the air outlets of the two fan casings, and the air flow balance is reduced by reducing the opening area of the adjustment opening corresponding to the air outlet on the side with the larger air volume. Have taken. The reduction ratio of the opening area of the adjustment opening can be easily realized, and the air volume balance can be finely adjusted. That is, not only can the problem of increased vibration and loud vibration noise due to unbalanced airflow be solved, but also the motor load can be made uniform. Since the two fans are within the projection plane of the inspection port, the main body is compact, the maintenance of the two fans can be performed from one direction, and the installation restrictions are reduced.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a part of the outer shell of the blower according to the present embodiment, FIG. 2 is a perspective view showing the whole blower, FIG. 3 is a side view of the blower, and FIG. FIG. 5 is a plan view showing the internal structure of the blower, FIG. 5 is a plan view of the exhaust adjustment plate, and FIG. 6 is an enlarged perspective view of the fan casing.

  The air blower according to the present embodiment is a ventilation blower having a substantially hexahedron that is suspended and installed in a ceiling space or the like of a building by a hanging metal fitting 1 and sucks indoor air through a duct and exhausts the air outside through the duct. . A suction port 3 and a discharge port 4 provided with duct connection ports are provided on a straight line on the opposite side of the main body box 2 configured in a substantially hexahedron (see FIGS. 1, 2 and 4). . Two identical centrifugal fans 5 are incorporated in the main body box 2 in parallel, and air sucked from the suction port 3 is blown out from the discharge port 4 into the duct through the duct. The two blowers 5 are both suction types having suction ports 7 and 8 on the motor side and the non-motor side in their fan casings 6, and both of them are arranged in the same direction (the suction port 3 and the suction port 3. It can be inspected from an inspection port 10 with a cover 9 provided on one side of the main body box 2 (see a line perpendicular to the line connecting the discharge ports 4) (see FIGS. 1, 2 and 5).

  In the main body box 2, one unit is connected between the first air passage 11 that extends from the suction port 3 to the suction port 8 on the side opposite to the motor of the one blower 5, and the two blowers 5 from the suction port 3. A second air passage 12 that diverts to the suction port 7 on the motor side of the blower 5 and the suction port 8 on the opposite side of the other blower 5, and the motor of the other blower 5 from the suction port 3. A third air passage 13 following the side suction port 7 is configured (see FIG. 4). In addition to this, there are fourth and fifth air passages 14, 15 following the air outlet 17 of each fan casing 6 from the impeller 16, and the airflow that has passed through the fourth and fifth air passages 14, 15. Are merged and exhausted to the discharge port 4. The motor-side suction port 7 disturbs the balance of the amount of air flowing through the two fan casings 6 because the motor 18 obstructs the air path. The amount of air flowing through the first air passage 11 is Q1, the amount of air flowing through the second air passage 12 is Q2, the amount of air flowing through the third air passage 13 is Q3, the amount of air flowing through the fourth air passage 14 is Q4, and the fifth. If the amount of air flowing through the air path 15 is Q5, the following relational expression is established. Q1> Q2> Q3, Q4> Q5 (formula 1), Q1 + Q2 + Q3 = Q4 + Q5 (formula 2).

  In the both-suction type blower 5, the motor-side suction port 7 and the counter-motor-side suction port 8 cause an imbalance in the air volume because the motor 18 prevents the flow of wind. In particular, in the case of a large air flow with two fans 5 provided, the motor 18 obstructs the air path and the balance of the air flow flowing through the two fan casings 6 is lost (Equation 1). Basically, the internal air passage width of the main body box 2 has been studied while taking the air volume balance into consideration, but this does not mean that the air volume balance can be achieved. In the present embodiment, the exhaust adjustment plate 19 shown in FIG. 6 provides a difference in the opening area of the outlet 17 of the two blowers 5 so that Q4 = Q5. Specifically, the exhaust adjustment plate 19 has two adjustment openings 20 at positions corresponding to the air outlets 17 of the two fan casings 6, and the opening area of the adjustment opening 20 corresponding to the air outlet 17 on the side having a larger air volume. The airflow is balanced by reducing the amount of airflow by the amount of airflow. The reduction ratio of the opening area of the adjustment opening 20 can be easily realized, and the air volume balance can be finely adjusted. That is, not only can the problem of vibration increase and vibration noise increase due to the unbalance (Q4> Q5) of the air volume, but also the motor load can be made uniform, resulting in a blower of both ratings (frequency). Since the two blowers 5 are within the projection plane of the inspection port 10, the main body is compact, the maintenance of the two blowers 5 can be disassembled and assembled from one direction, and there are few restrictions on installation. Become. Even if the exhaust adjustment plate 19 is configured integrally with the main body box 2 by the side structure itself of the main body box 2, the same function can be achieved even if the number of parts is reduced.

Embodiment 2. FIG.
FIG. 7 is an enlarged perspective view showing a fan casing of the blower according to the present embodiment. The blower of the present embodiment is devised in the air outlet of the fan casing shown in the first embodiment to change the opening area of the air outlet. The parts other than those relating to this configuration are the same as those in the first embodiment. Therefore, the same reference numerals are used for the same parts as those in the first embodiment, and description thereof is omitted.

  In the air blower of the present embodiment, the air volume balance of the two air blowers 5 is performed by the air outlet member 21 that changes the opening area of the air outlet 17 of the fan casing 6. The blower outlet member 21 is a part or all of the flange 22 configured at the mouth edge of the blower outlet 17 of the fan casing 6 that contacts the inner surface of the main body box 2 as shown in FIG. It is possible to adopt a method of bending the air outlet 17 toward the air outlet 17 or attaching another air outlet member 21 to a part of the air outlet 17. This air outlet member 21 can also make the air volume balance of the two blowers 5 uniform as in the first embodiment. The other functions are the same as those in the first embodiment.

It is a perspective view which removes and shows a part of outer shell of an air blower. (Embodiment 1) It is a perspective view which shows the whole ventilation apparatus. (Embodiment 1) It is a side view of an air blower. (Embodiment 1) It is a plane block diagram which shows the internal structure of an air blower. (Embodiment 1) It is a top view of an exhaust adjustment plate. (Embodiment 1) It is an expansion perspective view of a fan casing. (Embodiment 1) It is an expansion perspective view of a fan casing. (Embodiment 2)

Explanation of symbols

  2 Body box, 3 Suction port, 4 Discharge port, 5 Blower, 6 Fan casing, 7 Motor side suction port, 8 Non-motor side suction port, 10 Inspection port, 17 Air outlet, 19 Exhaust adjustment plate, 21 Blow Outlet member.

Claims (4)

  Two identical centrifugal fans are installed in parallel in a substantially hexahedron main body box with one suction port and one discharge port on the opposite side to connect the duct, and the air sucked from the suction port through the duct The blower is configured to blow out from the discharge port to the duct, and the two blowers are of a double suction type having suction ports on the motor side and the non-motor side in the fan casing, both of which are on the motor side The suction port is configured in the same direction so that it can be inspected from an inspection port provided on one side of the main body box, and the air volume balance of the two blowers is set to the opening area of the blower outlet of the blowers. The blower adjusted by giving a difference.   The air blower according to claim 1, wherein the air volume balance is performed by an exhaust adjustment plate having two adjustment openings having different opening areas at positions corresponding to the air outlets of the two fan casings.   2. The air blower according to claim 1, wherein the air volume balance is performed by a part of the main body box having two adjustment openings having different opening areas at positions corresponding to the air outlets of the two fan casings. .   It is an air blower of Claim 1, Comprising: The air blower made to perform air volume balance with the blower outlet member which changes the opening area of the blower outlet of a fan casing.

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