Axial flow fan with flow guide device

Abstract

The axial flow fan comprises an inlet current collector, an axial flow wind wheel, a motor and a protective net cover, the air outlet side of the protective net cover is detachably provided with the flow guide device, and the flow guide device comprises an outer ring, a plurality of flow guide blades and an inner ring. The flow guiding device is additionally arranged on the basis of a traditional axial flow fan and fixed to the air outlet side of the fan protection net cover, the flow guiding device effectively adjusts the air flow direction of a wind wheel outlet, energy loss of the wind wheel outlet is reduced, the energy efficiency of an existing product is improved under the condition that cost is not increased much, and the service life of the fan is prolonged. And the current energy efficiency standard is met. After the flow guide device is additionally arranged, due to the fact that static pressure of the fan is increased, the application working condition of the fan is wider, and the product application range is widened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation equipment technical field especially, it relates to a kind of axial flow ventilator with flow guide device. BACKGROUND

[0002] In the ventilation equipment technical field, axial flow ventilator is a kind of common equipment, and its main role is to produce airflow by rotating blade, to realize the delivery and energy conversion of air.

[0003] Ventilator energy efficiency standard is the technical requirement formulated to regulate its energy efficiency and reduce energy consumption. The energy efficiency requirement of ventilator is a mandatory or recommended standard formulated by countries to reduce energy consumption and promote green technology development.

[0004] Digitalization, energy saving and sustainability are the three major trends in the current market, and high energy efficiency fan products are the urgent needs under this trend. Various countries have successively introduced new standards for gradually improving the energy efficiency of ventilators. This will promote the technological innovation of the ventilator industry, and bring certain benefits to the ventilator industry in terms of reducing energy consumption, reducing operating costs and environmental protection.

[0005] Directly eliminating existing products that do not meet the current energy efficiency standard will result in huge waste and loss, so improving the design of existing products to improve their energy efficiency to meet the energy efficiency standard is a new energy efficiency design means adopted by many enterprises. Improvement measures include using high-efficiency motors, optimizing impeller design, full-life-cycle variable frequency control, etc.

[0006] Traditional axial flow ventilator includes inlet collector, wind wheel, motor, protective screen cover. Its wind wheel outlet energy loss is more, still needs to improve the energy efficiency of product, to meet the current energy efficiency standard. INVENTION CONTENTS

[0007] To solve the above technical problems, the utility model designs a kind of axial flow ventilator with flow guide device. On the basis of traditional axial flow fan, increase flow guide device, the flow guide device is fixed at the air outlet side of fan protective screen cover, the increase of flow guide device effectively adjusts the airflow direction of wind wheel outlet, reduces wind wheel outlet energy loss, in the case of not much cost increase, brings the improvement of existing product energy efficiency, to meet the current energy efficiency standard. After increasing flow guide device, due to the improvement of fan static pressure, the working condition of the ventilator is wider, and the use range of the product is expanded.

[0008] The utility model adopts the following technical scheme:

[0009] A kind of axial flow ventilator with flow guide device, including inlet collector, axial flow wind wheel, motor, protective screen cover, the air outlet side of the protective screen cover can be detachably installed with flow guide device, the flow guide device includes outer ring, several flow guide vanes and inner ring.

[0010] As preferred, the outer ring air inlet of the flow guide device is uniformly arranged with multiple groups of connecting structures in the circumferential direction, and the air outlet side of the protective mesh cover is detachably installed with the flow guide device through the connecting structures.

[0011] As preferred, each group of the connecting structures comprises a forward buckle arranged in a forward direction and a reverse buckle arranged in a reverse direction, and the forward buckle and the reverse buckle are respectively clamped on the protective mesh cover.

[0012] As preferred, the forward buckle and the reverse buckle are respectively clamped on the front side of the protective mesh cover.

[0013] As preferred, the forward buckle and the reverse buckle are respectively clamped on the side edge of the protective mesh cover.

[0014] As preferred, the flow guide device is integrally injection molded or assembled in parts.

[0015] As preferred, the flow guide vane is connected at the root with the inner ring and connected at the top with the outer ring.

[0016] As preferred, the size and profile of the flow guide vane are determined by the flow field characteristics and matched with the corresponding main machine. The profile of the flow guide vane is a spatial curve, and the specific profile design is determined according to the application working condition of the flow field and considering the customer installation space and the structure size of each part of the ventilator.

[0017] As preferred, the inner ring of the flow guide device is matched with the motor rear cover shell.

[0018] The beneficial effects of the utility model are: (1) when the axial flow fan wind wheel rotates, the outlet airflow of the wind wheel has a certain rotating component, the traditional fan wind wheel outlet is not provided with a flow guide device, and the unprocessed rotating kinetic energy is lost in the form of dynamic pressure. This brings energy loss. The technical scheme increases the flow guide device at the air outlet of the protective mesh cover, effectively adjusts the airflow direction of the wind wheel outlet, eliminates the rotating kinetic energy, reduces the kinetic energy loss; at the same time, the airflow is rectified, the flow velocity distribution is more uniform, the static pressure efficiency is effectively improved, and the energy efficiency grade of the traditional ventilator is improved; (2) after the flow guide device is increased, the static pressure of the fan is further improved, and the application range of the ventilator is expanded; (3) the flow guide device can suppress turbulent flow and vortex shedding, the rectified airflow is more stable, and the noise of the axial flow ventilator can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure diagram of the axial flow ventilator of the utility model embodiment one;

[0020] Figure 2 It is a structure diagram of the flow guide device of the utility model embodiment one;

[0021] Figure 3 It is a local schematic view of the flow guide device connecting structure of the embodiment one.

[0022] Figure 4 This is a structural diagram of the axial flow fan according to Embodiment 2 of this utility model;

[0023] Figure 5 This is a structural diagram of the flow guiding device according to Embodiment 2 of this utility model;

[0024] Figure 6 This is a partial schematic diagram of the connection structure of the flow guiding device in Embodiment 2;

[0025] Figure 7 Aerodynamic performance curves before and after adding a flow guide device to a traditional axial flow fan;

[0026] The technical names of the attached figures are as follows: 1. Inlet collector, 2. Axial flow impeller, 3. Motor, 4. Protective net cover, 5. Flow guide device, 51. Outer ring, 52. Flow guide blade, 53. Inner ring, 54. Connection structure, 541. Forward snap, 542. Reverse snap. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0028] Example 1: As Figure 1 As shown, an axial flow fan with a flow guiding device includes an inlet collector 1, an axial flow impeller 2, a motor 3, a protective mesh cover 4, and a flow guiding device 5 fixed to the protective mesh cover. Figure 2 and Figure 3 As shown, the flow guiding device includes an outer ring 51, several flow guiding blades 52, and an inner ring 53. The inner ring structure is adapted to the motor outlet. Four sets of connecting structures 54 are provided on the air inlet side of the outer ring of the flow guiding device. The flow guiding device is fixed to the protective mesh cover through the connecting structures. Each set of connecting structures includes two staggered buckles, a forward buckle 541 arranged in the forward direction and a reverse buckle 542 arranged in the reverse direction. The forward buckle and the reverse buckle are respectively engaged with the front of the protective mesh cover.

[0029] Example 2: As Figure 4 As shown, an axial flow fan with a flow guiding device includes an inlet collector 1, an axial flow impeller 2, a motor 3, a protective mesh cover 4, and a flow guiding device 5 fixed to the protective mesh cover. Figure 5 and Figure 6As shown, the flow guide device includes an outer ring 51, a plurality of flow guide vanes 52, and an inner ring 53. The inner ring structure is matched with the motor outlet. Four sets of connecting structures 54 are arranged on the air inlet side of the outer ring of the flow guide device. The flow guide device is fixed to the protective mesh cover through the connecting structures. Each set of connecting structures includes two staggered buckles, a forward buckle 541 arranged in a forward direction and a reverse buckle 542 arranged in a reverse direction. The forward buckle and the reverse buckle are respectively clamped on the side edges of the protective mesh cover.

[0030] Figure 7 The air dynamic performance curves before and after adding the flow guide device for the same type of axial flow fan are shown in the following table. Figure 7 As can be seen from the table, after adding the flow guide device, the static pressure of the fan increases, and the static pressure efficiency increases.

[0031] The above-described embodiments are only two preferred schemes of the utility model, and do not limit the utility model in any form. Other variants and modifications can be made without exceeding the technical scheme recited in the claims.

Claims

1. A axial flow fan with flow guiding device, comprising an inlet collector (1), an axial flow impeller (2), a motor (3), a protective screen cover (4), characterized in that, The air outlet side of the protective screen cover (4) is detachably installed with a flow guide device (5), and the flow guide device comprises an outer ring (51), a plurality of flow guide vanes (52) and an inner ring (53).

2. A mixed flow fan with a flow guiding device according to claim 1, characterized in that The air inlet of the outer ring of the flow guide device is uniformly arranged with a plurality of groups of connecting structures (54) in the circumferential direction, and the air outlet side of the protective screen cover (4) is detachably installed with the flow guide device (5) through the connecting structures (54).

3. A propeller fan with flow guiding means according to claim 2, characterized in that Each group of the connecting structures (54) comprises a forwardly arranged forward buckle (541) and a reversely arranged reverse buckle (542), and the forward buckle (541) and the reverse buckle (542) are respectively clamped on the protective screen cover (4).

4. A mixed flow fan with a flow guiding device according to claim 3, characterized in that The forward buckle (541) and the reverse buckle (542) are respectively clamped on the front surface of the protective screen cover (4).

5. A propeller fan with flow guiding means according to claim 3, characterized in that The forward buckle (541) and the reverse buckle (542) are respectively clamped on the side edge of the protective screen cover (4).

6. The axial fan with flow guiding means according to claim 1, characterized in that The flow guide device (5) is integrally injection molded or assembled in parts.

7. The axial fan with flow guiding means according to claim 1, characterized in that The root of the flow guide vane (52) is connected with the inner ring (53), and the top of the flow guide vane (52) is connected with the outer ring (51).

8. The axial fan with flow guiding means according to claim 1, characterized in that The size and profile of the flow guide vane (52) are determined by the flow field characteristics and matched with the corresponding main machine.

9. The axial fan with flow guiding means according to claim 1, characterized in that The inner ring of the flow guide device (5) is matched with the rear cover shell of the motor (3).

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