CN1189665C - Dual-flow ventilator - Google Patents

Abstract

A double-flow fan mainly includes an impeller, a casing, a collector, a bracket, and the like. Both the impeller and the casing are composed of a centrifugal fan structure part and a cross-flow fan structure part. The air inlet is composed of the air inlet of the centrifugal fan at both ends and the air inlet of the cross-flow part; the air outlet is composed of the air outlet of the centrifugal fan at both ends and the air outlet of the cross-flow part, the impeller is installed in the casing, and the bracket is connected to the collector On the collector, the collector is fixed at the air inlet of the casing, and the shafts at both ends of the impeller are fixed on the bracket. The driving motor of the fan can be driven by a belt, or it can be driven by a disc or external rotor motor. When the double-flow fan is working, the centrifugal fan parts at both ends can generate higher wind pressure to overcome the rising resistance during work.

Description

Dual flow fan

The invention relates to a double-flow fan, in particular to a double-flow fan suitable for a split-type air conditioner indoor unit, and belongs to the field of fluid machinery.

In the prior art, the indoor units of split type air conditioners basically utilize cross-flow fans to send cold (hot) airflows. Since the wind pressure generated by the cross-flow fan is mainly dynamic pressure, when the system resistance increases (for example, in wet working conditions), the air volume will decrease a lot, which will reduce the cooling capacity and affect the cooling effect. The multi-blade centrifugal fan is also a kind of fan that is widely used in the field of air conditioning. Although it can obtain higher pressure and have better performance characteristics than the cross-flow fan, the width of the impeller cannot be increased arbitrarily, and it is generally controlled within the width and impeller diameter. than less than 1. Therefore, its outlet cannot be made into a long and narrow shape, and the increase of the air volume is also limited.

The patent number is CN 99113678.0, and the invention patent named "two-way fan" is mainly "changing the existing centrifugal impeller by interlacing the forward blades and reverse blades"; "the volute is a coaxial two-way volute ". This kind of fan belongs to a kind of centrifugal fan, which only supplies air to two directions, and is not suitable for supplying air to the indoor unit of the air conditioner.

In order to overcome the deficiencies and defects of the prior art, the present invention improves the cooling effect of the indoor unit of the air conditioner under wet conditions; or reduces the influence of the fan on the air volume when the system resistance changes greatly, and designs a simple structure , A ventilation machine that can overcome large resistance changes during work - a double-flow fan.

SUMMARY OF THE INVENTION: The present invention utilizes the characteristics that the impeller of the cross-flow fan and the impeller of the multi-blade centrifugal fan are very similar to construct a brand-new fan—double-flow fan. It adopts the structure of multi-blade centrifugal fan at both ends, and the structure of cross-flow fan in the middle. Therefore, the air inlet of the double-flow fan is distributed at both ends and the middle; while the air outlet is formed by the confluence of the centrifugal and cross-flow parts. Therefore, the double-flow fan not only overcomes the shortcoming of the cross-flow fan being relatively soft, but also makes up for the limitation of the multi-blade centrifugal fan because the width cannot be increased at will and the air volume is limited.

The invention includes impeller, casing, collector, shaft and bracket. Both the impeller and the casing are composed of a centrifugal fan structure part and a cross-flow fan structure part. The impeller consists of centrifugal part blades, cross flow part blades, inlet disk, centrifugal partition, cross flow partition and shaft. The number of blades and the inlet and outlet angles of the centrifugal and cross-flow parts can be designed to be consistent or different; the inlet plate and the cross-flow partition are ring-shaped disks, the centrifugal partition is a disc-shaped disk, and the cross-flow partition The number can be increased or decreased according to the axial length of the impeller. The two ends of the casing of the double-flow fan are the volute of the centrifugal fan, and the middle section is consistent with the casing of the cross-flow fan. The air inlet is composed of the air inlet of the centrifugal fan at both ends and the air inlet of the cross-flow part; the air outlet is composed of the air outlet of the centrifugal fan at both ends and the air outlet of the cross-flow part. When assembling, first put the impeller into the casing, then weld the bracket to the current collector, then fix the current collector to the air inlet of the casing with screws, and finally fix the shafts at both ends of the impeller to the bracket. The driving motor of the fan can be driven by a belt, or it can be driven by a disc or external rotor motor. When the double-flow fan is working, the centrifugal fan parts at both ends can generate higher wind pressure to overcome the rising resistance during work.

The invention has substantive characteristics and remarkable economic benefits.

The specific implementation of the present invention will be further described below in conjunction with accompanying drawing:

Figure 1 is a schematic diagram of the structure of a double-flow fan

Figure 2 is a structural diagram of a double-flow fan impeller

Figure 3 is a schematic diagram of the double-flow fan casing and the air inlet and outlet

As shown in FIG. 1 , FIG. 2 , and FIG. 3 , the double-flow fan includes an impeller 1 , a casing 2 , a collector 3 , a shaft 10 and a bracket 4 . Both the impeller 1 and the casing 2 are composed of a centrifugal fan structure part and a cross-flow fan structure part.

The impeller 1 is composed of a centrifugal blade 5 and a cross-flow blade 6 , an inlet disk 7 , a centrifugal partition 8 and a cross-flow partition 9 . Both ends of the impeller 1 are equipped with an inlet disk 7, one end of the centrifugal blade 5 is embedded on the periphery of the inlet disk 7, and the other end is connected to the cross-flow blade 6 through the centrifugal partition 8, and the cross-flow blade 6 is formed by the through-flow blade. The flow partitions 9 are separated, and the number of cross-flow partitions 9 can be increased or decreased according to the axial length of the impeller 1; the number of centrifugal blades 5 and cross-flow blades 6, and the inlet and outlet angles can be designed to be consistent or different; The disc 7 and the through-flow partition 9 are annular disks, and the centrifugal partition 8 is a disc-shaped disk.

The two ends of the shell 2 are the volute of the centrifugal fan structure, and the middle section is consistent with the shell of the cross-flow fan structure. There are axial air inlets 11 and 12 on both ends of the casing 2, and air outlets 14 and 15 are arranged on the radial direction of the volute at both ends of the casing 2; and there is an air inlet on the bottom of the middle (through-flow part) of the casing 2 13. An air outlet 16 is arranged radially, and the air outlets 14, 15, 16 jointly constitute the air outlet of the double-flow fan.

The impeller 1 is installed in the casing 2, the bracket 4 is connected to the collector 3, the collector 3 is fixed at the axial air inlets 11 and 12 of the casing 2, and the shaft 10 at both ends of the impeller 1 is fixed to the bracket 4. When the double-flow fan is working, the two ends of the impeller 1 suck the air from the axial air inlets 11, 12, and under the action of centrifugal force, the air flows radially out and flows out along the radial air outlets 14, 15; through the middle section part, the airflow is inhaled from the air inlet 13 at the lower part of the casing 2, and the airflow flows out from the radial air outlet 16 under the action of centrifugal force. The effect of centrifugal force makes the double-flow fan increase the wind pressure by about 10-20pa compared with the air-conditioning cross-flow fan, which is enough to overcome the resistance loss caused by condensed water in wet working conditions. The smaller the width of the dual-flow fan, the greater the boosted wind pressure.

Claims (2)

1. dual-flow ventilator, comprise impeller (1), shell (2), slip ring (3), axle (10) and support (4), it is characterized in that impeller (1) comprises centrifugal blade (5), through-flow blade (6), import dish (7), centrifugal dividing plate (8) and through-flow dividing plate (9), the both ends of the surface of impeller (1) respectively are equipped with import dish (7), one end of centrifugal blade (5) is inlaid on the periphery of import dish (7), and the other end joins by centrifugal dividing plate (8) and through-flow blade (6), through-flow blade (6) is separated by through-flow dividing plate (9), have air inlet through hollow shaft mouth (11) on the both ends of the surface of shell (2), (12), radially have an exhaust outlet (14) at the two ends spiral case of shell (2), (15); The central bottom of shell (2) has intake grill (13), radially have exhaust outlet (16), impeller (1) is packed in the shell (2), support (4) is connected on the slip ring (3), slip ring (3) is fixed on axial admission mouth (11), (12) of shell (2) and locates, and the axle (10) at impeller (1) two ends is fixed on the support (4).

2. dual-flow ventilator according to claim 1, its feature are that also the through-flow dividing plate (9) of import dish (7) is circular disc, and centrifugal dividing plate (8) is discoid disc.

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