JP3651515B2 - Blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal blower used for air conditioning equipment.
[0002]
[Prior art]
In this type of blower, an impeller having a large number of blades facing forward in the rotational direction is incorporated in a spiral casing. The suction port is formed on one side parallel to the rotating surface of the impeller of the casing, and the outlet is opened in the direction perpendicular to the suction port at the outer peripheral portion of the casing. In many cases, one outlet is a one-way outlet, but since this type of air flow tends to be uneven, for example, as shown in FIG. Thus, a blower for air conditioning equipment that has mitigated the drift has been developed (see Japanese Utility Model Laid-Open No. 4-103295).
[0003]
[Problems to be solved by the invention]
In any case, the conventional centrifugal blower as described above cannot form an airflow in the axial direction by itself, and the two blower outlets 101 and 102 are opened in opposite directions at intervals of 180 degrees. The air blower itself must be housed in the chamber structure, and the air flow blown out from the two outlets 101 and 102 must be blown out together by the chamber structure, and the pressure is used to rapidly change the direction of the air flow by the chamber structure. The loss is large and there is a problem not only in noise, but there is also a problem that the number of components increases and the whole size increases.
[0004]
The present invention has been made in order to solve the above-described conventional problems, and the object of the present invention is to obtain a centrifugal blower that can form an air flow in the axial direction and has less drift. It is to achieve downsizing of a centrifugal blower with little drift, and to obtain a centrifugal blower with high air volume characteristics and high applicability to an air conditioner with little drift.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is characterized in that one suction port and an end of an air passage following the scroll surface, which is the inner surface of a rectifying plate formed in a bowl shape at a symmetrical position around the suction port, are provided. A fan casing having two opened air outlets, and an impeller having a large number of blades rotating in the fan casing and forming an air flow from the suction port toward the two air outlets The base side of the tongue portion at one end is cut into a plane configuration with a dimension smaller than the maximum radius of the scroll surface by cutting the scroll surface, and the plane configuration portion of one rectifying plate and the tongue portion of the other rectifying plate end And means for forming an air flow outlet to each outlet.
[0006]
By adopting the above means, it is possible to increase the enlargement ratio, which is an index indicating the degree of expansion of the current plate in a logarithmic spiral, and to reduce the size of the fan casing.
[0007]
In order to achieve the above-mentioned object, the invention according to claim 2 is characterized in that one suction port and an end of the air passage following the scroll surface which is the inner surface of the current plate formed in a bowl shape at the symmetrical position around the suction port. A fan casing having two opened air outlets, and an impeller having a plurality of blades rotating in the fan casing and forming an air flow from the air inlet to the two air outlets, Means for opening the mouth and each outlet in a plane parallel to the rotational surface of the impeller is employed.
[0008]
By employ | adopting the said means, the air suck | inhaled from the suction inlet can be blown out as an air flow of an axial direction from each blower outlet.
[0009]
In order to achieve the above object, the invention of claim 3 is characterized in that the base side of the end of the current plate in the means according to claim 2 has a dimension smaller than the maximum radius of the scroll surface by cutting the scroll surface. A plane configuration is adopted, and means for forming an air flow outlet to each outlet is formed by a plane configuration portion of one current plate and a tongue at the end of the other current plate.
[0010]
By adopting the above-mentioned means, the air sucked from the suction port can be blown out as an axial air flow from each of the blowout ports together with the function according to claim 2, and further, the degree of expansion that expands in a logarithmic spiral shape of the rectifying plate Since the enlargement ratio, which is an index indicating, can be increased, the exit can be increased.
[0011]
In order to achieve the above object, the invention according to claim 4 employs means for opening the inlet of the fan casing and each outlet in the means according to claim 2 in the same direction.
[0012]
By adopting the above-mentioned means, it is possible to collectively configure the flow path systems on the suction side and the blow-out side that are connected to the blower together with the function according to claim 2 on one side.
[0013]
In order to achieve the above object, the invention of claim 5 employs means for opening each outlet to the opposite side with respect to the suction port in the means according to claim 2.
[0014]
By adopting the above means, it is possible to configure the suction side and outlet side flow passage systems connected to the blower together with the function according to claim 2 on the opposite side.
[0015]
In order to achieve the above object, the invention according to claim 6 employs means for providing a guide portion having a curved surface structure for guiding the air flow to the outlet side in the air passage following each scroll surface in the means according to claim 2. .
[0016]
By adopting the above means, the airflow is smoothly directed in the axial direction together with the function according to the second aspect, so that the pressure loss is reduced.
[0017]
In order to achieve the above object, a seventh aspect of the present invention provides a motor mounting surface that faces the suction port related to the spiral chamber defined by each scroll surface in the means according to any one of the second to sixth aspects. A means for closing by a plate is adopted.
[0018]
By adopting the above-described means, the opening area of each outlet can be widened together with the function according to any one of claims 2 to 6.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
The blower of the first embodiment shown in FIG. 1 is a centrifugal blower called a sirocco fan in which an impeller 2 having a large number of blades facing forward in the rotation direction is incorporated in a fan casing 1. The fan casing 1 has the following characteristics. That is, the fan casing 1 has a hexahedron box shape and the suction side is the front side (in the following description, the suction side is the front side, and FIG. 1 is a perspective view in rear view ) . The front shape is a rectangle, and one suction port 3 is formed at the front center. As shown in FIG. 2, which is a rear view of the fan casing 1, the inside of the fan casing 1 is formed so that two rectifying plates 4 surround the suction port 3 in a bowl shape at symmetrical positions around the suction port 3. ing. The inner peripheral surface of each rectifying plate 4 is formed as a spiral scroll surface 5, and two air outlets 7 and 8 are opened at the end of the air passage 6 following each scroll surface 5, respectively, facing the back side.
[0020]
The base A side of each rectifying plate 4 has a size smaller than the maximum radius of the scroll surface and is configured in a plane B. Each rectifying plate 4 has a plane B portion and a tongue portion 9 at the end of the other rectifying plate 4. An airflow outlet 10 to the blowout ports 7 and 8 is formed. Actually, the scroll surface is cut at an elevation angle of 45 ° to 90 ° with respect to a horizontal plane passing through the center of the suction port 3 and is continuous as a horizontal plane B , and the air passages 6 are formed continuously. One air passage 6 is defined by one rectifying plate 4, a positive wall surface 11, an upper wall surface 12, and a right wall surface 13, and is formed on the right side of the suction port 3. The other air passage 6 is connected to the other rectifying plate 4 and the positive wall surface 6. The wall surface 11, the lower wall surface 14, and the left wall surface 15 are defined on the left side of the suction port 3. Each air passage 6 is formed with a guide portion 16 having a curved surface structure that guides the airflow toward the air outlets 7 and 8 that open toward the back side. The guide portion 16 forms curved surfaces facing the slide outlets 7 and 8 at the corners of the positive wall surface 11 and the upper wall surface 12 and the corners of the positive wall surface 11 and the lower wall surface 14. . In addition, arcuate guide walls 17 are formed at the corners of the upper wall surface 12 and the right wall surface 13 of one air passage 6 and at the corner portions of the lower wall surface 14 and the left wall surface 15 of the other air passage 6. Has been.
[0021]
The spiral chamber 18 defined by the inner surfaces of the two rectifying plates 4 is closed by a motor mounting plate 19 mounted on the back side of the fan casing 1. A motor 20 is mounted on the motor mounting plate 19 so that its rotation shaft protrudes to the center of the spiral chamber 18, and the impeller 2 is mounted on the rotation shaft so that the impeller 2 can rotate in the spiral chamber 18. . Accordingly, the rotating surface of the impeller 2 and the surfaces of the suction port 3 and the outlets 7 and 8 are parallel to each other. The fan casing 1 according to the first embodiment is formed as a molded polystyrene foam having good workability and sound absorption, but may be formed of sheet metal as is normally seen.
[0022]
This blower has two outlets 7 and 8 and has a drift mitigating function as in this type of conventional one, but has a great feature in that it can form a blown airflow in the axial direction with a centrifugal structure. That is, when the impeller 2 rotates, air is sucked into the spiral chamber 18 from the suction port 3. The sucked air is applied with speed and pressure by the centrifugal force generated by the rotation of the impeller 2 and the shape of the spiral chamber 18, and is guided by the scroll surfaces 5 and flows into the two air passages 6. By the circular arc surface and the curved surface of the guide portion 16, the air is smoothly directed toward the air outlets 7 and 8 and blown out in the axial direction from the air outlets 7 and 8. That is, as shown in FIGS. 3 and 4, after the airflow that has flowed from the outlet 10 of the spiral chamber 18 to the air passage 6 rotates in the vertical direction on the guide wall 17, the back surface is slid on the slide by the guide portion 16. The air outlet 6 is directed to the air outlets 7 and 8 on the side, the pressure loss of the air passage 6 is small, the air flow characteristics are improved, and the noise is also reduced. Therefore, the applicability of the air conditioner as a blower is increased in combination with the fact that the axial airflow can be formed independently without requiring a chamber structure or the like.
[0023]
Further, since the upper surface and the lower surface of the fan casing 1 are cut to a size smaller than the maximum radius of each scroll surface 5 (plane B) , the enlargement ratio is an index indicating the degree of expansion of the rectifying plate 4 in a logarithmic spiral shape. As a result, the outlets 10 of the spiral chamber 18 can be made larger to improve the air flow characteristics.
[0024]
In addition, as shown in FIG. 5, the two blower outlets 7 and 8 can be formed in the front with the suction inlet 3, and it can blow out to the front side, and this can make it connect with an air blower by the suction side and blower side. Although it is possible to configure each flow path system collectively on one side, since the air flow is made to make a U-turn by the air passage 6, it is not very effective in terms of air blowing performance.
[0025]
Embodiment 2. FIG.
FIG. 6 is a rear view showing the blower of the second embodiment. The blower of the second embodiment is characterized by the airflow guide in the air passage, and is the same as that of the first embodiment except for the configuration related to this. Accordingly, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0026]
The blower according to the second embodiment has air outlets 7 as shown in FIG. 7 at the corners of the positive wall surface 11 and the right wall surface 13 of the air passage 6 and the corners of the positive wall surface 11 and the left wall surface 15. , 8 is provided with an airflow guide 21 having a curved surface directed to 8, in an integrated configuration or a separate configuration. The other configuration is the same as that of the first embodiment. The function of this blower is basically the same as that of the first embodiment. However, as shown in FIG. The curved surface and the guide portion 16 are directed toward the rear air outlets 7 and 8, and if the one of the first embodiment is a rotary air outlet type, it can be said to be a parallel air outlet type. Since other functions are the same as those of the first embodiment, description thereof is omitted.
[0027]
Embodiment 3 FIG.
In this third embodiment, the blower shown in the first and second embodiments is applied to a humidifying device 22 which is a kind of air conditioner as shown in FIG. The humidifier 22 has a configuration in which a blower 24 (the blower shown in the first and second embodiments), a filter 25 and a humidifier 26 are linearly incorporated in a main body casing 23. The main body casing 23 forms a straight ventilation path, and a filter 25 and a humidifier 26 are mounted on the downstream side of the blower 24 in the vicinity of the blower 24. The airflow blown out from the blower 24 passes through the entire surface of the filter 25 and the humidifier 26 from the air outlets 7 and 8 having a large opening area as an axial flow with less drift and turbulence. The humidifier 26 is of a natural evaporation type and the air flow from the blower 24 passes uniformly, so that the humidifying function is improved and the apparatus can be downsized. Further, since the airflow until passing through the filter 25 is an axial flow with little turbulent flow, the humidifying device has a low pressure loss, a good air volume characteristic and a low noise.
[0028]
As shown in FIG. 9, if a mounting structure 27 such as a groove is provided on the back side of the fan casing 1 of the blower 24, and the filter 25 is directly attached to the mounting structure 27, the blower 24 is integrated. A small filter unit with a simple configuration can also be configured.
[0029]
【The invention's effect】
As is clear from the above description, according to the invention of claim 1, the enlargement ratio, which is an index indicating the extent of expansion of the current plate in a logarithmic spiral shape, can be increased, and the outlet can be enlarged, so that the air flow characteristics are improved. The dimensions of the fan casing can also be reduced.
[0030]
According to the second aspect of the present invention, a centrifugal blower with less drift can be obtained in which the air sucked from the suction ports can be blown out from the respective outlets as an air flow in the axial direction.
[0031]
According to the third aspect of the present invention, the expansion ratio, which is an index indicating the degree of expansion of the rectifying plate in a logarithmic spiral shape together with the effect according to the second aspect, can be increased, so that the outlet can be increased and the air flow characteristic is improved. To do.
[0032]
According to invention of Claim 4, it becomes possible to comprise each flow path system of the suction side and discharge side made to communicate with a fan with the said effect which concerns on Claim 2 collectively on one side, and the applicability to air-conditioning equipment Increase.
[0033]
According to invention of Claim 5, it becomes possible to comprise each flow path system of the suction side connected to an air blower with the said effect which concerns on Claim 2, and a blowing side on the opposite side, and the applicability to an air-conditioning installation is possible. Increase.
[0034]
According to the sixth aspect of the present invention, since the air flow is smoothly directed in the axial direction together with the effect according to the second aspect, the pressure loss is reduced, the air flow characteristic is improved, and the noise is also reduced.
[0035]
According to the invention of claim 7, together with the effect according to any one of claims 2 to 6, the opening area of each air outlet can be widened, and it can be applied to an air conditioner such as a filter unit or a humidifier. Applicability can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of a blower showing Embodiment 1. FIG.
FIG. 2 is a rear view independently showing a fan casing of the blower according to the first embodiment.
FIG. 3 is a function explanatory diagram illustrating a blowing function of the blower according to the first embodiment.
FIG. 4 is a rear view showing a blowing function of the blower according to the first embodiment.
FIG. 5 is a side view showing another form of the blower of the first embodiment.
FIG. 6 is a rear view showing the blower of the second embodiment.
FIG. 7 is an enlarged perspective view showing an airflow guide of the blower according to the second embodiment.
8 is a configuration diagram of a humidifying device showing an application example of a blower according to Embodiment 3. FIG.
9 is a perspective view of a filter unit showing an application example of a blower according to Embodiment 3. FIG.
FIG. 10 is a perspective view showing a conventional blower.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fan casing 2 Impeller 3 Suction port 4 Current plate 5 Scroll surface 6 Air path 7 Air outlet 8 Air outlet 9 Tongue part 10 Outlet 16 Guide part 17 Guide wall 18 Swirl chamber 19 Motor mounting plate
A base
B plane

Claims (7)

A fan casing having one air inlet and two air outlets each opened at the end of the air passage following the scroll surface, which is the inner surface of the rectifying plate formed in a bowl shape in a symmetrical position around the air inlet, An impeller having a large number of blades that rotate in the fan casing and forms an air flow from the suction port toward the two air outlets, and a base portion side of the tongue portion at the end of the current plate is disposed on the scroll surface. Cut into a plane configuration with dimensions smaller than the maximum radius of this scroll surface, and the air flow outlet to each outlet is formed by the plane configuration part of one rectifying plate and the tongue of the end of the other rectifying plate A blower characterized by   A fan casing having one air inlet and two air outlets each opened at the end of the air passage following the scroll surface, which is the inner surface of the rectifying plate formed in a bowl shape in a symmetrical position around the air inlet, An impeller having a large number of blades that rotate in the fan casing and forms an air flow from the suction port toward the two air outlets, and the air inlet and the air outlet of the fan casing are rotated by the impeller. A blower characterized in that it is opened in a plane parallel to the plane, and the air sucked in from the suction port is blown out in the axial direction from each outlet. It is a blower of Claim 2, Comprising : The base part side with respect to the tongue part of the edge of a baffle plate is made into a plane structure by the dimension smaller than the maximum radius of the scroll surface by cutting a scroll surface, and the plane of one baffle plate An air blower characterized in that an air flow outlet to each air outlet is formed by a component part and a tongue at the end of another rectifying plate.   It is a blower of Claim 2, Comprising: The air blower characterized by opening the suction inlet and fan outlet of a fan casing in the same direction.   It is a blower of Claim 2, Comprising: Each blower outlet was opened on the opposite side with respect to the suction inlet, The blower characterized by the above-mentioned.   3. The blower according to claim 2, wherein a guide portion having a curved surface structure for guiding the air flow toward the air outlet side is provided in an air passage following each scroll surface.   It is a blower in any one of Claim 2-6, Comprising: The surface which opposes the suction inlet regarding the spiral chamber which the impeller defined by each scroll surface rotates is closed by the motor attachment plate. Blower featuring.

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