JPH01244238A - Air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an air conditioner.

BACKGROUND OF THE INVENTION Conventionally, various measures have been taken to prevent surging in air conditioners having cross-flow fans.

An example of the conventional air conditioner mentioned above will be described below with reference to the drawings.

FIG. 4 shows the structure of a ventilation circuit of an air conditioner having a conventional cross-flow fan. As shown in the figure, the suction side has a suction grill 5, a heat exchanger 6, etc., and a crossflow fan 1, a casing front plate 2, a casing rear plate 3, etc. constitute a ventilation circuit. In addition, cross flow fan 1
As shown in FIG. 5, an appropriate number of fan blocks 10 are connected to form a long fan rotor.

Problems to be Solved by the Invention However, in the configuration shown in FIG.
etc.) or due to the shape of the casing of the air flow passage (for example, the casing front plate 2, the casing rear plate 3, etc.), the air resistance distribution on the fan suction side becomes uneven along the entire length of the cross-flow fan, and the cross-flow fan 1 When rotating, the air volume from the area with high intake air resistance is smaller than the air volume from the area with low resistance, and if a small-scale imbalance in air volume occurs at first, then the air from the large air volume becomes the wind from the area with small air volume. As a result, the difference in air volume becomes larger and larger.

By the way, due to the above-mentioned process, the air volume in a certain part became 6th.
It has been experimentally known that when the temperature drops below the point P in the characteristic curve (A) in the figure, the area in question is operated in a so-called unstable region, and a surging phenomenon occurs, causing the entire crossflow fan to generate vibration and noise. .

The "unstable region" here refers to P on the characteristic curve in Figure 6.
This refers to the region to the left of the point where the static pressure decreases as the air volume decreases.

Here, when the air volume decreases, the static pressure decreases, and a force acts on the fan in the direction of decreasing the air volume, so a force acts on the fan in a direction that promotes fluctuations in the air volume. Therefore, in this region, once the air volume fluctuates, it is not stable. Furthermore, the "stable region" in Fig. 6 refers to the region to the right of point P on the characteristic curve, where as the air volume increases, the static pressure decreases, and as the air volume decreases, the static pressure increases. A fan has arbitrary static pressure and air volume depending on the load condition, and operates stably by balancing the load at a single point.

In view of the above problems, the present invention aims to prevent surging of an air conditioner.

Means for Solving the Problems In order to solve the above problems, the present invention comprises a cross flow fan, a casing front plate, and a casing rear plate to form a ventilation circuit, and a part of the blowout side of the casing front plate has a high difference,
Ribs are formed with uniform width and mounting pitch.

Effects The present invention has the above-described configuration, so that even if an uneven distribution of suction resistance exists on the upstream side of the suction port of the cross-flow fan, a biased flow will not occur in the axial direction of the elongated fan rotor.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3 of the accompanying drawings.

FIG. 1 is an internal sectional view of an indoor unit of a separate type air conditioner.

As shown in the figure, there are a suction grill 5, a heat exchanger 6, etc. on the suction side, a cross flow fan 1, a casing front plate 2, etc.
, the casing rear plate 3 constitutes a ventilation circuit. The rib 4 of the present invention is formed on the inner surface of the casing front plate 2 on the outlet side. Further, on the Suita side, upper and lower deflection blades 7 and left and right deflection blades 8 are attached.

FIG. 2 is an enlarged perspective view of the air outlet portion of FIG. 1. As shown in the figure, ribs 4 are formed on the inner surface of the outlet side of the casing front plate 2 (in this figure, the ribs 4 are attached to both ends of the outlet side where suction air resistance is small).

FIG. 3 is an enlarged view of the AA cross section in FIG. 2.

As shown in the figure, the rib 4 has a height h1 width t1 length e from the inner surface of the casing front plate 2, and the ribs are integrally molded with equal pinch spacing p.

According to this configuration, if there is no rib 4 and the ventilation resistance on the suction side of the crossflow fan 1 increases due to clogging of the filter, the flow will be biased from the center of the crossflow fan 1 toward both ends where the suction air resistance is low. W (indicated by arrow)
However, because of the presence of the rib 4, the ventilation area of the air outlet passage 9 is located downstream of the area (both ends) with low air resistance. By narrowing the constriction, it is possible to prevent the occurrence of a biased flow W from the side with higher suction air resistance to the side with lower suction air resistance, and as a result, the occurrence of surging phenomenon can be prevented.

In addition, conventionally, when surging occurs, square polyethylene or the like is pasted as a countermeasure, but since the rib 4 is integrally molded with the casing front plate 2, the cost and the number of man-hours for pasting the polyethylene can be reduced. Furthermore, if the width t of the rib 4 is made wide, sink marks will occur during molding, but since the width t of the rib 4 is kept to the maximum dimension that does not cause whiskers, there is no need to worry about this.

Effects of the Invention As described above, the present invention prevents drifting of the fan in the axial direction, thereby preventing the occurrence of surging phenomenon, and enabling quiet and stable operation of the air conditioner without noise or vibration.・

[Brief explanation of the drawing]

Fig. 1 is an internal sectional view of an indoor unit of a separate air conditioner according to an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the air outlet portion of the same indoor unit, and Fig. 3 is an A of the air outlet portion of the same indoor unit. 4 is an internal sectional view of a conventional indoor unit, FIG. 5 is a plan view of a cross flow fan, and FIG. 6 is a characteristic diagram of the cross flow fan. 1... Cross flow fan, 2... Casing front plate, 3... Casing rear plate, 4... Rib,
5... Suction grill, 6... Heat exchanger, 7...
Upper and lower deflection blades, 8...Left and right deflection blades, 9.-Suita passage. Name of agent: Patent attorney Toshio Nakao et al. 18th
1rXJ, --Crossflow Faso Figure 3

Claims (1)

[Claims] An air conditioner comprising a crossflow fan, a casing front plate, and a casing rear plate to form a ventilation circuit, and a rib having a uniform height, width, and mounting pitch is formed on a part of the outlet side of the casing front plate.