WO2020088111A1

WO2020088111A1 - Cross-flow air duct structure, fan heater, and air conditioner having cross-flow air duct structure

Info

Publication number: WO2020088111A1
Application number: PCT/CN2019/105003
Authority: WO
Inventors: 朱芳勇; 廖俊杰; 李树云; 李业强; 李建建; 王现林; 吴俊鸿; 高旭; 陈志伟; 陈启荣; 暨文伟; 石浩哲; 朱振; 王启龙
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-11-02
Filing date: 2019-09-10
Publication date: 2020-05-07
Also published as: CN109237790A; CN109237790B

Abstract

Disclosed in the present application are a cross-flow air duct structure, a fan heater, and an air conditioner having the cross-flow air duct structure. The cross-flow air duct structure comprises a volute casing, a panel, an air inlet, and an air outlet; a cross-flow fan blade is provided in the volute casing; the panel and the cross-flow fan blade are unequally spaced; the minimum spacing between the panel and the cross-flow fan blade is L; an air guide structure is provided on the panel. The cross-flow air duct structure of the present application is applicable to the fan heater. In the present application, an air guide apparatus is locally added so as to promote outflow of a cross-flow air duct volute tongue to return to a cross-flow area at an appropriate position in advance, thereby improving the air volume of a cross-flow fan and achieving the purpose of improving efficiency; a high-speed airflow at the volute tongue reenters the cross-flow area as soon as possible so as to shorten an acting time between the high-speed airflow at the position and the panel and reduce abnormal noise caused by rotor-stator interaction to the maximum extent.

Description

Cross-flow duct structure, heater and air conditioner with same

Related application

This application requires the priority of the Chinese patent application filed on November 2, 2018, with the application number 201811301364.8, titled "A Cross-flow Duct Structure, Heater, and Air Conditioner with It", the full text of which is hereby incorporated Reference.

Technical field

The present application relates to the technical field of fans, in particular to a cross-flow duct structure, a heater, and an air conditioner having the same.

Background technique

With the improvement of people's living standards, the requirements for indoor heat exchange equipment such as air conditioners and heaters are getting higher and higher. On the one hand, the indoor unit of the heat exchange equipment is required to have small size, thin thickness, and beautiful appearance, and on the one hand, there is an increasing demand for quietness. However, when the air inlet and outlet of the heat exchange equipment is limited, the small size of the shell will cause abnormal noise due to dynamic and static interference between the shell and the moving parts including the fan blades and the motor. This contradicts the customer's silent experience.

Summary of the invention

The purpose of the present application is to address the deficiencies in the above technology, and propose an air-conditioning indoor unit air guide structure and an air conditioner, aiming to solve the problem of gaps existing in the existing air-conditioner indoor unit air guide plate after closing.

The technical problem solved by the present application is that under the condition that the air intake of the heat exchange equipment is limited, the cross-flow fan blade acts as a high-speed moving component, and the static gradient is too close to the static panel component due to dynamic and static interference, and the speed gradient is too large to cause abnormal noise.

This application uses the following technical solutions:

The present application provides a cross-flow duct structure, including a volute, a panel, an air inlet, and an air outlet, a cross-flow fan blade is provided in the volute, and an unequal space is formed between the panel and the cross-flow fan blade The minimum distance between the panel and the cross-flow fan blade is L, and a wind guide structure is provided at the position of the panel.

In one of the embodiments, the wind guide structure is a bent or straight plate structure, one end of which is fixed on the panel, and the other end is suspended.

In one of the embodiments, when the wind guide structure is a curved plate structure, the wind guide structure is curved in an arc shape as a whole, and the bending direction is the same as the circumferential velocity vector of the rotation of the nearest cross-flow blade.

In one of the embodiments, the wind guide structure is an arc-shaped structure in which the panel is arranged to protrude toward the inside of the cross-flow duct.

In one of the embodiments, the wind guide structure is a structure that pushes the position of the panel outward, so that the minimum gap between the panel and the cross-flow wind blade is greater than L.

In one of the embodiments, the number of the wind guiding structure is not less than one.

In one of the embodiments, a plurality of the air guide structures are sequentially arranged along the panel near the air outlet side, wherein the first air guide structure is disposed at a minimum distance between the panel and the cross-flow blades.

In one of the embodiments, the distance between the hanging end of each wind guide structure and the rotation center of the cross-flow wind blade is the same.

In one of the embodiments, the arrangement of the wind guide structure satisfies the following conditions:

Among them, Dmin represents the minimum gap between the cross-flow vane and the panel; d represents the horizontal length of the wind guide structure.

In one of the embodiments, a grille mechanism is provided on the air outlet.

The present application also provides a heater, including the above-mentioned cross-flow duct structure.

The present application also provides an air conditioner including the above-mentioned cross-flow duct structure.

The beneficial effects of this application are as follows: on the basis of not increasing the overall size of the whole machine, by changing the flow state and range of the high-speed airflow of the cross-flow blade, the size of the eccentric vortex of the cross-flow blade is reduced, and the air volume of the cross-flow fan is increased. Disguise the distance between the fixed structural parts and the high-speed airflow, reduce the dynamic and static interference noise, and effectively improve the overall silent performance of the fan.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present application. For those of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on the published drawings.

1 is a schematic diagram of the main body structure of a heater according to an embodiment of the present application;

2 is a view of the position requirements of the wind guide structure according to an embodiment of the present application;

3 is a schematic diagram of a simulation solution according to an embodiment of the present application;

Fig. 4 is a cloud diagram of broadband noise distribution based on the schemes of Fig. 3;

5 is a first alternative solution of the wind guide structure according to an embodiment of the present application;

6 is a second alternative solution of the wind guide structure according to an embodiment of the present application;

7 is a third alternative solution of the wind guide structure according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

This application aims to solve the problem of abnormal wind duct noise caused by limited shell size, and proposes a cross-flow duct structure, including a volute, a panel, an air inlet, and an air outlet. The volute is provided with a cross-flow wind blade An unequal spacing space is formed between the panel and the cross-flow blades, the minimum distance between the panel and the cross-flow blades is L, and a wind guide structure is provided at the position of the panel. The cross-flow duct structure of the present application can be applied to heaters and air conditioners.

This application adopts a special wind guide structure at the position of the smallest gap between the cross-flow fan blade and the panel to promote the volute tongue outflow to return to the cross-flow area in advance, so as to achieve the purpose of improving efficiency and reducing noise.

In this embodiment, a heater is used as an example to further describe the structure of the cross-flow duct.

The structure of the heater is shown in Figure 1. The main structure includes the air inlet 1 and the inlet grille, the panel 2, the cross-flow fan 3, the air guide structure 4, the volute 5, the heat exchange equipment 6, the air outlet 7, the snail Shell 8, throat 9, etc. Wherein: the air inlet 1 and the air inlet grille, the air inlet 1 is at the upper end of the heater, the air inlet grille is placed in the air inlet 1, and the air inlet grille has the function of preventing burns. The panel 2 is on one side of the air inlet 1 and the lower part of the intake grille. When the heater is installed, the panel 2 faces the customer. The cross-flow fan blade 3 is a high-speed rotating moving part inside the heater. The wind guide structure 4 is provided at the position of the panel 2. The structure of the volute tongue 5 of the cross-flow air duct is located between the heat exchange device 6 and the cross-flow air blade 3, and is at a certain distance from the cross-flow air blade 3. The heat exchange device 6 is a heat generating device in a heater, and is downstream of the cross-flow fan blade 3. The air outlet 7 is located on the lower side of the cross-flow fan and the heat exchange device 6 and is close to the panel 2. The associated air outlet 7 includes but is not limited to structures such as an outlet grille, guide vanes, and air guide plates. The volute 8 is structured on the other side of the cross-flow fan blade 3 and wraps the cross-flow fan blade 3 with the panel 2 on the left and right sides. The volute 8 and the volute tongue 5 and the panel 2 Together with the cross-flow fan 3, a cross-flow duct for the heater is formed. The volute 9 structure is connected between the volute 8 and the air inlet 1 and is connected to the upstream of the volute 8 structure.

In an embodiment, the wind guide structure 4 is a bent plate structure, one end of which is fixed on the panel 2 and the other end is suspended. The wind guiding structure 4 may be arranged as shown in FIG. 1 in an overall upward curve, and the upward direction is the same as the circumferential velocity vector at which the nearest cross-flow blade rotates.

In an embodiment, the wind guide structure 4 is a straight plate structure as shown in FIG. 7, one end of which is fixed on the panel 2 and the other end is suspended.

Please refer to Figure 2. When the wind guiding structure is a straight plate or a bent plate structure, the setting of the wind guiding structure satisfies the following conditions:

Among them, D _min represents the minimum gap between the cross flow vane 3 and the panel 2; d represents the horizontal length of the wind guide structure.

When the wind guide structure is a straight plate or a curved plate structure, optionally, the wind guide structure may be provided in multiples, that is, 2 to n wind guide structures of the same or different lengths and the same or different intervals are used. In this embodiment, three equidistant wind guide structures are used as an example for description. As an alternative to the wind guiding structure, the arrangement of a plurality of the wind guiding structures is shown in FIG. 5 and is arranged in sequence along the panel 2 close to the air outlet 7 side, wherein the first wind guiding structure is provided at At the minimum distance between the panel 2 and the cross flow vane 3. In this case, optionally, the distance between the hanging end of each wind guide structure and the center of rotation of the cross-flow fan blade 3 is the same, this structure can better improve the air flow of the cross-flow fan, and more effectively improve the overall fan Silent performance.

In an embodiment, the wind guide structure is shown in FIG. 6, and the panel 2 is arranged as an arc structure convex toward the inside of the cross-flow duct.

In an embodiment, the wind guide structure may also be a structure as shown in Scheme 1 in FIG. 3, that is, the position of the panel 2 is pushed outward so that the minimum between the panel 2 and the cross flow vane 3 is The gap is greater than L. The advantage of this solution is that the distance between the panel 2 and the cross-flow blade 3 increases due to the position of the panel 2, which reduces the mutual interference caused by the panel 2 and the cross-flow blade 3 being too close. Can effectively reduce noise. But this solution will further aggravate the leakage at the volute. Therefore, this solution is mainly used to verify whether the cause of noise is related to the distance between the panel and the wind blade.

In order to control the fan noise, the volute tongue of the cross-flow fan needs to maintain a certain distance from the fan blade, but this gap is also the main location of the leakage flow. After the high-speed airflow leaks from the volute tongue gap, it returns to the panel area. The high-speed airflow interacts with the panel to produce an abnormal sound. By adding a local diversion structure at the minimum gap between the cross-flow vane and the panel, although it seems to further shorten the gap between the panel and the vane, due to the small cross-section of the diversion structure, the erosion area is limited, and the diversion structure will leak the volute tongue The flow is forced back into the cross flow area, reducing the volute leakage flow and the eccentric vortex size (see Figure 3 and the table below for details). The simulation results show that by adding this local diversion structure, the flow rate is increased by 17%, and the broadband noise is Was dropped.

Statistics Table of Simulation Data of Various Schemes Based on Figure 3

Among them: Please refer to FIG. 3 and FIG. 4, the plan 1 is to push the position of the panel 2 outward; the plan 2 is an arc structure protruding toward the inside of the cross-flow duct; Set a shorter straight plate at the minimum gap between them; Option 4 is to set a longer straight plate at the minimum gap between the cross-flow vane 3 and the panel 2; Option 5 is to set a minimum between the cross-flow vane 3 and the panel 2 A straight plate is provided above the gap.

In summary, this application increases the airflow of the cross-flow duct to return to the cross-flow area at an appropriate position by adding a wind guide device locally, thereby increasing the air volume of the cross-flow fan and achieving the purpose of improving efficiency; The high-speed airflow at the tongue position re-enters the flow area as soon as possible, reducing the action time of the high-speed airflow at this position and the panel, and minimizing the noise abnormality caused by dynamic and static interference.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To simplify the description, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered within the scope of this description.

The above-mentioned embodiments only express several implementation manners of the present application, and their descriptions are more specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all fall within the protection scope of the present application. Therefore, the protection scope of the patent of this application shall be subject to the appended claims.

Claims

A cross-flow duct structure includes a volute (8), a panel (2), an air inlet (1), and an air outlet (7). A cross-flow wind blade (3) is provided in the volute (8). An unequal spacing space is formed between the panel (2) and the cross-flow fan blade (3), and the minimum distance between the panel (2) and the cross-flow fan blade (3) is L, which is characterized in that: A wind guide structure (4) is provided at the position of the panel (2).
The cross-flow duct structure according to claim 1, characterized in that the wind guide structure (4) is a bent plate or straight plate structure, one end of which is fixed on the panel (2), and the other end is suspended.
The cross-flow duct structure according to claim 2, wherein when the wind guiding structure (4) is a bent plate structure, the wind guiding structure (4) is curved in an arc shape as a whole, and the direction and distance of the bending The circumferential velocity vectors of the closest cross-flow vane blade rotation are the same.
The cross-flow duct structure according to claim 1, wherein the wind guide structure (4) is an arc-shaped structure in which the panel (2) is convex toward the inside of the cross-flow duct.
The cross-flow duct structure according to claim 1, characterized in that the wind guide structure (4) is a structure that pushes the position of the panel (2) outward so that the panel (2) and the cross-flow fan blade ( 3) The minimum gap between them is greater than L.
The cross-flow duct structure according to any one of claims 2-3, characterized in that the number of the wind guiding structure (4) is not less than one.
The cross-flow duct structure according to claim 6, characterized in that a plurality of the wind guide structures (4) are arranged in sequence along the panel (2) close to the air outlet (7) side, wherein the first guide The wind structure (4) is arranged at the minimum distance between the panel (2) and the cross-flow wind blade (3).
The cross-flow duct structure according to claim 6, characterized in that the distance between the hanging end of each wind guide structure (4) and the center of rotation of the cross-flow duct (3) is the same.
The cross-flow duct structure according to any one of claims 2-3, characterized in that the arrangement of the wind guide structure (4) satisfies the following conditions:

Among them, Dmin represents the minimum gap between the cross-flow fan blade (3) and the panel (2); d represents the horizontal length of the wind guide structure (4).
The cross-flow duct structure according to claim 1 or 2, wherein a grille mechanism is provided on the air outlet (7).
A heater is characterized by comprising a cross-flow duct structure according to any one of claims 1 to 10.
An air conditioner, characterized by comprising the cross-flow duct structure according to any one of claims 1 to 10.