JPS6311528Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field of the Invention] The present invention provides heat exchangers at the outlet of a fan casing containing a centrifugal multi-blade fan, respectively in front and rear of the rotational direction of the centrifugal multi-blade fan. This relates to a fan casing of a ceiling-mounted air conditioner that divides the indoor atmosphere blown out from the outlet and blows it out from the ceiling.In particular, it is possible to efficiently perform air conditioning by dividing the indoor atmosphere equally to each heat exchanger. The present invention also relates to a ceiling-embedded air conditioner that can minimize cost increase. [Technical background of the invention and its problems] Generally, as a ceiling-embedded air conditioner, the one shown in FIG. 1 is known. In FIG. 1, reference numeral a denotes a centrifugal multi-blade fan, and a fan casing c having an air outlet b and surrounding it is provided on the outer periphery of the centrifugal multi-blade fan a. At the air outlet b of the fan casing c, heat exchangers d and e are provided at the front and rear sides of the centrifugal multi-blade fan a in the rotational direction, respectively. The indoor atmosphere is sucked into the fan casing c by a centrifugal multi-blade fan a through a suction grill g formed in a ceiling part f, and is blown out from an air outlet b. The indoor atmosphere blown out from the air outlet b is divided and passes through the heat exchangers d to e, where it is heat exchanged and blown out into the room from the air outlet grilles h and i formed in the ceiling part f, respectively. Ru. However, due to the characteristics of the centrifugal multi-blade fan a, the indoor atmosphere blown out from the outlet b is biased toward the heat exchanger d, which is located in front of the centrifugal multi-blade fan a in the rotational direction (on the left in this example). There is a tendency for the flow to be separated, so that the atmosphere is exchanged with the heat exchanger d located at the front in the rotational direction of the centrifugal multi-blade fan a and blown out from the blow-off grille h, and the atmosphere is blown out from the air outlet grille h at the rear in the rotational direction. The temperature and wind speed of the atmosphere blown out from the outlet grille i after heat exchange with the outlet grille were different, making it impossible to perform air conditioning efficiently. In addition, in ceiling-embedded air conditioners, due to space limitations inside the ceiling, it is necessary to downsize or partially cut the fan casing c in order to make the height of the housing that partitions the air conditioner body as low as possible. However, for this reason, there was an increased tendency for the indoor atmosphere blown out from the air outlet b to be biased toward the heat exchanger d, which is located forward in the direction of rotation of the fan a. In order to solve this problem, there is a method of installing a partition plate, a rectifying plate, etc., and thereby dividing the indoor atmosphere blown out from the air outlet b equally to each heat exchanger, but this method reduces the air volume and This was a factor in increasing costs. [Purpose of the invention] The present invention was devised in view of the above-mentioned conventional problems and to effectively solve them. A ceiling-embedded air conditioner that can efficiently perform air conditioning by equally dividing the flow of air into each of the heat exchangers installed at the front and rear of the rotation direction of a multi-blade fan, and which can minimize cost increase. The goal is to provide the following. [Summary of the invention] In order to achieve the above object, the present invention has a centrifugal multi-blade fan with an air outlet installed at the rear in the rotational direction so as to stand up on the downstream side in the airflow direction at the edge of the air outlet located at the front in the rotational direction of the centrifugal multi-blade fan. A fan casing for a ceiling-embedded air conditioner is constructed by integrally forming a folded extension part. [Embodiment of the invention] A preferred embodiment of the invention will be described below with reference to the accompanying drawings. As shown in Fig. 2, the ceiling-embedded air conditioner has an opening 2 formed in the ceiling 1, and a housing 3 that is inserted into the opening 2 to define the main body of the air conditioner is attached to a beam or the like. It is suspended and supported by hanging bolts 4 attached to. A ceiling panel 5 is provided to cover the opening 2 formed in the ceiling 1, and the ceiling panel 5 has a suction grill 6 in the center and outlet grills 7 and 8 on both sides. It is formed. Inside the housing 3, a centrifugal multi-blade fan 9 is provided facing the suction grille 6 for blowing indoor atmosphere. The centrifugal multi-blade fan 9 has a fan casing 1 surrounding it and having an air outlet 10 on its outer periphery.
1 is formed. At the air outlet 10 of the fan casing 11, heat exchangers 12 and 13 are provided, respectively, at the front and rear sides of the centrifugal multi-blade fan 9 in the rotational direction (counterclockwise in this embodiment). In particular, the feature of the present invention is that the air outlet 1 is located at the front of the centrifugal multi-blade fan 9 in the direction of rotation.
The extension part 14 is formed on the edge part 10a of the heat exchanger 10 in order to equally divide the indoor atmosphere blown out from the air outlet 10 to each of the heat exchangers 12 and 13. The extending portion 14 extends from the end edge 1 of the air outlet 10.
0a is folded back to stand up on the downstream side in the blowing direction and is integrally formed with the fan casing 11. Specifically, as shown in FIG.
The outlet edge 10a located at the front in the rotational direction of the centrifugal multi-blade fan 9 and the outlet edge 10b, 10c located at the side in the rotational direction are erected downstream in the outlet direction, and the rotation The extending piece 14a that stands upright in the forward direction is inclined backward in the rotational direction. More specifically, if the distance from the center of the centrifugal multi-blade fan 9 to the outlet 10 is A, and the length or height of the extending portion 14 erected from the outlet 10 is B, then A and The ratio with B is 0.4<B/A
The extending portion 14 is formed so that <0.5. Further, the extending piece 14a erected forward in the rotational direction of the centrifugal multi-blade fan 9 has an inclination angle Θ of 10°<Θ<
It is formed at an angle of 30 degrees. Next, the operation of the present invention will be explained. The indoor atmosphere is sucked into the housing 3 through the fan casing 11 from the suction grille 6 by the centrifugal multi-blade fan 9, and is blown out from the air outlet 10 of the fan casing 11. The indoor atmosphere blown out from the air outlet 10 passes through the extension part 14, is guided by the extension part 14, is divided into streams, and is sent to the heat exchangers 12 and 13. The indoor atmosphere sent to the heat exchanger 12 undergoes heat exchange there and is blown out from the blow-off grill 7 into the room. On the other hand, heat exchanger 13
The indoor atmosphere sent to the room undergoes heat exchange here and is blown out from the blow-off grill 8 into the room. The indoor atmosphere blown out from the air outlet 10 is divided equally into the forward and rearward directions in the rotational direction by an extending portion 14 formed on the air outlet edge 10a located at the front in the rotational direction of the centrifugal multi-blade fan 9. Therefore, the atmosphere that is blown out from the blow-off grille 7 after being heat-exchanged by the heat exchanger 12 provided at the front in the direction of rotation.

[Effect of idea]

As is clear from the above explanation, the present invention exhibits the following excellent effects. (1) Since an extension is formed at the edge of the air outlet located at the front in the rotational direction of the centrifugal multi-blade fan, the difference in air volume between the front and rear airflow in the rotational direction is reduced. The amount of air blown can be made uniform, and air conditioning can be performed efficiently. (2) Since the extending portion is integrally formed with the fan casing, cost increases can be kept to a minimum. (3) The structure is simple and can be easily adopted.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a fan casing of a conventional ceiling-mounted air conditioner, FIG. 2 is a side sectional view showing a preferred embodiment of the ceiling-mounted air conditioner according to the present invention, and FIG. The figure is a perspective view showing the fan casing of FIG. 2. In the figure, 1 is the ceiling, 9 is a centrifugal multi-blade fan, 1
0 is an air outlet, 10a is an edge thereof, 11 is a fan casing, 12 and 13 are heat exchangers, and 14 is an extension.

Claims (1)

[Scope of Claim for Utility Model Registration] 1 Heat exchangers are provided at the outlet of a fan casing containing a centrifugal multi-blade fan in the rotational direction of the centrifugal multi-blade fan. In a ceiling-embedded air conditioner that divides the indoor atmosphere blown out from the outlet and blows it out from the ceiling, the heat exchanger is installed at the edge of the outlet located forward in the rotational direction of the centrifugal multi-blade fan. A ceiling-embedded air conditioner is characterized in that an extension part is formed in each of the parts to equally divide the indoor atmosphere. 2. The ceiling-embedded air conditioner according to claim 1, wherein the extending portion is integrally formed by folding back the end edge of the air outlet so as to stand up downstream in the air blowing direction.