JP3364345B2 - Air flow control device for centrifugal blower - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal blower installed in an air conditioner, when the measured value of the blown air volume differs from the calculated value, the measured value at the air conditioner installation site. The present invention relates to a blower air volume control device for a centrifugal blower, which can easily adjust the air volume to be obtained. 2. Description of the Related Art Conventionally, an air conditioner has a built-in blower whose size and number of revolutions are determined based on calculated values corresponding to the air volume and wind pressure required at an installation site. When the machine is carried into the site and the air volume and the air pressure are measured, the measured value and the required air volume and the air pressure often do not match. That is, the duct system wind pressure resistance value of the duct connected to the air conditioner is a calculated value, and the calculated value is expected to have a high safety factor, and the actual duct system wind pressure resistance value is low. Actual measured values at the site tended to be higher than the required airflow. In order to solve this problem, a damper for controlling the air volume is conventionally provided in the middle of the duct, and the damper is adjusted to reduce the excessive air volume, or to reduce the air volume by lowering the rotation speed of the blower in the air conditioner. I was However, in the former case, there is a problem that the noise near the residential area increases due to the reduction of the air volume.In the latter case, when the blower is driven by a belt, the pulley must be replaced to reduce the rotation speed, and When the motor is directly connected to the motor, it is necessary to attach an auxiliary device such as an inverter, and in any case, the operation is complicated and causes an increase in cost. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a blower of a centrifugal blower capable of adjusting the air volume on site by a simple operation quickly and inexpensively by one person. An object is to provide an air volume control device. [0006] Therefore, the present invention is configured as a means, a blocking plate projecting into the inside of the outlet of the centrifugal blower, and capable of selecting the amount of air blown out from the outlet, In a blower air amount adjusting device for a centrifugal blower detachably provided in a housing, a closing plate has a T-shaped cross section from a closing portion and a mounting portion, and a fitting portion to which the mounting portion fits is formed inside the housing. A T-shaped insertion hole is formed in the side of the housing so as to be connected to the fitting portion and into which the closing plate is fitted.
A plurality of indications corresponding to the ratio of the blown air amount are displayed on the closing portion of the closing plate, and the amount of protrusion that projects into the inside of the outlet can be selected according to the display. [0007] According to the above means, it is possible to adjust the air flow by attaching and detaching the closing plate from the air outlet, and it is possible to easily attach the closing plate from the side of the housing. The protrusion amount of the closing plate in the outlet can be selected according to the difference between the values. An embodiment will be described below with reference to the drawings. FIG. 4 illustrates a typical air conditioner incorporating a blower. Reference numeral 1 denotes an air conditioner, and the air conditioner 1 has a blower 1
1. A cooling / heating heat exchanger 12, a drain pan 13, and an air filter 14 are built in, and an outlet 15 and the like are provided.
And since such a horizontal type is arrange | positioned at the ceiling surface where height was restricted, it is important that the height of the main body of the air conditioner 1 is smaller. On the other hand, the largest point that determines the height of the main body of the air conditioner 1 is the diameter of the spiral housing 3 of the blower 11 in FIG. Therefore, it is not an exaggeration to say that the height of the air conditioner 1 is usually determined by the dimensions of the housing 3. Further, since the air volume adjustment work is performed on site after the air conditioner 1 is installed, it must be made as easy as possible. Therefore, it is desirable that the closing plate 6 described later of the present invention be attached from the side surface of the blower 11. 1 and 2, the housing 3 is formed by left and right side plates 31, 31 and a back plate 32.
Reference numeral 31 denotes a substantially circular shape opposed to each other, and has a back plate mounting protrusion 33 whose outer peripheral end is bent inward, and an insertion port 34 of the impeller 17 formed substantially in the center. After being provided in the housing 3, a suction guide link 35 is attached to the insertion port 34 to form a suction port 36. Code 6
Denotes a closing plate attached to the housing 3 from the side. The left and right ends of the back plate 32 are connected to the back plate mounting projections 33 of the left and right side plates 31, 31 having the predetermined spacing.
The air outlet 15 is formed at the upper and lower ends of the back plate 32 and the front ends of the left and right side plates 31, 31. A fitting portion 4 to which the closing plate 6 is detachably attached is formed on the inner surface of the back plate 32 in the vicinity of the inside of the air outlet 15. Is formed with a T-shaped fitting hole 37 into which the closing plate 6 is fitted. The closing plate 6 is, as shown in FIG.
2 is formed into a T-shaped cross section by a fitting portion 61 fitted to the fitting portion 4 and a closing portion 62 protruding into the inside of the air outlet 15. Projecting toward the mounting portion 61 side of the protruding portion.
3 are formed. That is, the closing plate 6 is inserted through the fitting hole 37 of the one side plate 31 so that the mounting portion 61 is fitted into the fitting portion 4.
It is inserted until it comes into contact with the inner surface of the other side plate 31, and is finally fixed to a stopper (not shown) formed on the side plate 31 or the like with a fixing port 63 with a screw. On the other hand, when it is not necessary to use the closing plate 6 within a range of an error between the calculated value and the measured value, a rubber sheet-like sealing material is lined with the fitting hole 37 to prevent leakage of the blown air flow. In this manner, the air flow in the housing 3 blocked by the closing portion 62 of the closing plate 6 is
At the same time as the air is blown out, a part is drawn back into the housing 3 along with the rotation of the impeller 17, and as a result, the amount of the blown air is reduced. On the other hand, in the closing portion 62 of the closing plate 6, the ratio of the blown air amount taking into account the air amount that decreases in accordance with the amount of protrusion of the closing portion 62 in the outlet 15 is displayed. That is,
In the embodiment of FIG. 3, when the blowout air amount when the blowout port 15 is fully opened is 100%, the ratio of each blowout amount obtained from the test value corresponding to the projecting position of the closing portion 62 is cut by one-touch. Perforated lines 621, 622, and 623, which are cut notches as much as possible, are indicated by numerals. That is, when the required air volume is 80% of the actually measured value, a desired air volume can be obtained by cutting the perforated line 622 with one touch and using it. The lower part of the perforated line 623 is 75
% Is used as a spare when the air volume is required to be less than 10%. However, the present invention is not a large adjustment device such as a damper, but eliminates the gap between the calculated value and the measured value of the duct system. Approximately 20% to 30 of the original blower specification
It is only necessary to reduce the air volume to a percentage, and it is not necessary to make it larger than necessary. Further, a specific procedure for marking the closing plate 6 is to change the resistance value of the duct system in an appropriate test apparatus and to perform a test using several types of closing plates 6 having different G dimensions in FIG. Measure. According to the test results, if the G dimension of the closing plate 6 is increased, the air volume naturally decreases for a while, but the shaft power (corresponding to power consumption) decreases in proportion to that, and the blowing noise tends to decrease at the same time. FIG. 6 is a graph showing the closing rate of the closing plate 6 with respect to the outlet opening (100%) of the blower 1 and the proportion of the blowing air amount corresponding to the opening opening (100%) of the blower 1.
Three types of closing plates 6 corresponding to the duct-type wind pressure resistance region are shown. That is, H indicates the vicinity of the high region of the blower 11 of a specific size, M indicates the vicinity of the middle region, and L indicates the closing ratio and the air volume ratio of each closing plate 6 when used in the wind pressure region near the low region. I have. And this applies to each blower size in common. For example, in the case of the closing plate 6 of L, if the air volume is desired to be 90% of the initially measured value, the outlet 15 may be closed by 8%. Below, 15 if you want to 80%
% And 75%, it is sufficient to close 18.2%. FIG. 3 shows an example of the closing plate 6 displayed based on this numerical value. According to the present invention, since the closing plate protruding into the inside of the air outlet is detachably provided in the housing, the closing plate can be detached at the site after the air conditioner is installed. Thus, the air volume can be easily and quickly adjusted, and problems caused by overcooling and overheating of the air conditioner and heating and discomfort caused by noise can be eliminated. In addition, the shaft power (power consumption) is reduced in proportion to the reduced air flow, which is economical. Further, the closing plate has a cross section T from the closing portion and the mounting portion.
A fitting portion in which the mounting portion fits is formed inside the housing, and a T-shaped fitting hole is formed in a side surface of the housing so as to be connected to the fitting portion and into which the closing plate is fitted, so that air conditioning is provided. Even if the machine is a horizontal type or a vertical type, the closing plate is not stuck by the wall surface or the ceiling surface, etc., and is stably attached to the housing than the side surface, and
The air volume can be adjusted by one-touch operation simply by inserting the closing plate into the fitting hole and the fitting portion of the housing. Further, the closing plate is provided with a plurality of displays corresponding to the ratio of the blown air volume, and the amount of protrusion protruding into the inside of the air outlet can be selected according to the display. Even if the value is higher than the required air volume, the ratio of the air volume is calculated based on the increased value, and the amount of protrusion of the closing plate can be naturally determined from the corresponding display. But it can be done very easily and quickly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a housing of a blower. FIG. 2 is a longitudinal sectional view of a main part showing a state in which a closing plate is attached. FIG. 3 is a perspective view of a closing plate. FIG. 4 is a schematic sectional view of a main part of a horizontal air conditioner. FIG. 5 is a schematic side view of a blower. FIG. 6 is an example of a graph which is calculated from test results and shows the closing ratio of the closing plate with respect to the outlet opening (100%) of the blower and the ratio of the blowing air amount corresponding thereto. [Description of Signs] 1 air conditioner 11 blower 15 outlet 3 housing 37 fitting hole 4 fitting portion 6 closing plate 61 mounting portion 62 closing portion

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-180800 (JP, A) JP-A 1-18700 (JP, U) JP-A 4-75199 (JP, U) JP-A 58-180 77199 (JP, U) Full opening 60-26299 (JP, U) Full opening 49-133803 (JP, U) Full opening 50-106105 (JP, U) Full opening 55-106395 (JP, U) Japanese Utility Model Showa 55-154400 (JP, U) Japanese Utility Model Showa 61-47500 (JP, U) Japanese Utility Model Showa 6-12800 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29/44

Claims (1)

(57) [Claims] [Claim 1] Projecting into the outlet of a centrifugal blower,
In a blower air volume adjusting device for a centrifugal blower in which a closing plate that allows a selection of the amount of air blown from an outlet is detachably provided in a housing, the closing plate has a T-shaped cross section from a closing portion and a mounting portion, A T-shaped fitting hole is formed inside the housing to fit the mounting portion, and a T-shaped fitting hole is formed on the side surface of the housing so as to be connected to the fitting portion and to fit the closing plate. A plurality of displays corresponding to the ratio of the amount of blown air are provided, and a protrusion amount protruding into the inside of the outlet can be selected according to the display.