Axial flow fan and air conditioning unit

Abstract

The axial flow fan comprises fan blades, a motor and a motor support, a first air guide ring and a second air guide ring are further coaxially arranged on the outer sides of the fan blades, the second air guide ring is installed in the first air guide ring in a nested mode, and the first air guide ring and the second air guide ring are coaxially arranged. The air inlet side end parts of the first air guide ring and the second air guide ring are connected with the mounting plate, and the air outlet side end part of the first air guide ring outwards protrudes out of the air outlet side end part of the second air guide ring in the axial direction. Due to the fact that the length of the first air guide ring in the axial direction is larger than that of the second air guide ring, when outlet air leaves the second air guide ring, the first air guide ring can play a role in blocking and gathering and is used for blocking air flow from dissipating in the radial direction, and therefore air horizontally blown out in the radial direction is guided to be blown out in the axial direction of the axial flow fan. The problem of short circuit of the air inlet and outlet field of the fan is effectively avoided, the air flow is more concentrated, and the air guide effect is further optimized.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioning equipment, and particularly relates to an axial flow fan and an air conditioning unit. Background Art

[0002] In large passenger cars, subways, EMUs, high-speed railways, energy storage cabinets and other equipment, at least one axial flow fan is generally installed as a condensing fan for the air conditioning unit. An air guide ring needs to be set on the outside of the axial flow fan. Most axial flow fan equipment on the market adopts a single air guide ring design. This design makes the air guide effect of the fan less than ideal. When the axial flow fan is installed in a place with limited space and insufficient air inlet space for the fan, the fan inlet flow field is poor. The air guide ring is too short. After the air leaves the air guide ring, it is very easy for the air to blow out horizontally along the radial direction of the fan, which is very easy to cause a short circuit in the fan inlet and outlet wind field. Utility Model Content

[0003] The main technical problem solved by the utility model is to provide an axial flow fan which can effectively avoid short circuit of wind flow field and optimize wind guiding effect, and also provide an air conditioning unit equipped with the axial flow fan.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is:

[0005] An axial flow fan comprises a fan blade, a motor and a motor bracket. A first air guide ring and a second air guide ring are coaxially arranged on the outer side of the fan blade. The second air guide ring is nested and installed inside the first air guide ring. The air inlet side ends of the first air guide ring and the second air guide ring are connected to a mounting plate, and the air outlet side end of the first air guide ring protrudes outwardly from the air outlet side end of the second air guide ring in the axial direction.

[0006] Furthermore, the end portion of the second air guide ring on the air inlet side is bent outward in an arc shape and connected to the mounting plate, and the end portion of the first air guide ring on the air inlet side is connected to the mounting plate.

[0007] Furthermore, the mounting plate is integrally formed by bending and stretching the air inlet side end portion of the second air guide plate outward.

[0008] Furthermore, the axial length of the second air guide ring is consistent with the axial thickness of the fan blade.

[0009] Furthermore, the axial length of the first air guide ring is at least 1.3 times the axial length of the second air guide ring.

[0010] Furthermore, a radial gap between the first air guide ring and the second air guide ring is 10-30 mm.

[0011] Furthermore, a radial gap between the top of the fan blade in the radial direction and the end of the second air guide ring on the air inlet side is 5 mm.

[0012] Furthermore, it also includes a motor and a motor bracket, the motor bracket includes a motor fixing frame and a plurality of branch connecting frames, the motor is mounted on the motor fixing frame, the plurality of branch connecting frames extend radially outward from the motor fixing frame, the branch connecting frame is composed of a continuous first section extending radially and a second section extending axially, the second section is placed between the first air guide ring and the second air guide ring, and the top end of the second section is connected to the mounting plate.

[0013] Furthermore, a plurality of sockets are provided on the first air guide ring corresponding to the branch connecting frame, and the sockets are provided at the connecting end of the first air guide ring and the mounting connection, and the top end of the branch connecting frame extends horizontally and passes through the sockets to be connected and fixed to the mounting plate.

[0014] In order to solve the above technical problems, another technical solution adopted by the utility model is:

[0015] An air conditioning unit is provided with the axial flow fan as described above.

[0016] In summary, the axial flow fan and air conditioning unit provided by the utility model have the following advantages compared with the prior art:

[0017] (1) In the utility model, since the end of the outlet side of the first air guide ring protrudes outwardly in the axial direction from the end of the outlet side of the second air guide ring, when the axial flow fan is installed in a place with limited space and insufficient air inlet space for the fan, since the length of the first air guide ring in the axial direction is longer than that of the second air guide ring, after the outlet air leaves the second air guide ring, the first air guide ring can play a blocking and gathering effect, and is used to block the wind flow from dissipating in the radial direction, thereby guiding the wind blown horizontally in the radial direction to be blown out in the axial direction of the axial flow fan, which not only solves the problem of short circuit between the fan inlet and outlet, but also makes the wind flow more concentrated, reduces the phenomenon of wind flow dissipation, and further optimizes the wind guiding effect of the axial flow fan.

[0018] (2) The second inner air guide ring of the utility model adopts an arc bending structure at the transition point of the end on the air inlet side to connect with the mounting plate, which cooperates with the blades of the fan blades to make the incoming wind field smoother, which is beneficial to reducing the wind inlet resistance, thereby optimizing the wind flow direction and improving the wind flow utilization rate.

[0019] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] In the attached picture:

[0022] Figure 1 This utility model axial flow fan structure Figure 1 ;

[0023] Figure 2 This utility model axial flow fan structure Figure 2 ;

[0024] Figure 3 It is a cross-sectional view of the axial flow fan structure of the utility model.

[0025] In the figure:

[0026] Fan blade 1, motor 2, motor bracket 3, motor fixing frame 31, branch connecting frame 32, first section 321, second section 322, first air guide ring 4, air inlet side end 41, air outlet side end 42, second air guide ring 5, air inlet side end 51, air outlet side end 52, mounting plate 6.

[0027] It should be noted that the drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides an axial flow fan, comprising a fan blade 1, a motor 2 and a motor bracket 3, wherein the motor 2 is mounted on the motor bracket 3, and the motor 2 is used to drive the fan blade 1 to rotate.

[0033] In this embodiment, a first air guide ring 4 and a second air guide ring 5 are coaxially arranged on the radially outer side of the fan blade 1, and the second air guide ring 5 is nested and installed inside the first air guide ring 4. The first air guide ring 4, the second air guide ring 5 and the fan blade 1 are also coaxially arranged. The air inlet side end 41 of the first air guide ring 4 and the air inlet side end 51 of the second air guide ring 5 are connected to the mounting plate 6, and the air outlet side end 42 of the first air guide ring 4 protrudes outwardly from the air outlet side end 52 of the second air guide ring 5 in the axial direction.

[0034] In the above structure, the second air guide ring 5 is integrally nested and installed inside the first air guide ring 4. Since the air outlet side end 42 of the first air guide ring 4 protrudes outwardly from the air outlet side end 52 of the second air guide ring 5 in the axial direction, that is, in the axial direction, the length of the first air guide ring 4 is longer than the length of the second air guide ring 5.

[0035] When the axial flow fan is installed in a place where space is limited and there is insufficient air inlet space for the fan, since the axial length of the first air guide circle 4 is longer than that of the second air guide circle 5, after the outlet air leaves the second air guide circle 5, the first air guide circle 4 can play a role in blocking the gathering and is used to block the wind flow from dissipating radially, thereby guiding the wind blown out horizontally in the radial direction to be blown out in the axial direction of the axial flow fan, which not only solves the problem of short circuit between the fan inlet and outlet, but also makes the wind flow more concentrated, reduces the wind flow dispersion phenomenon, and further optimizes the wind guiding effect of the axial flow fan.

[0036] In this embodiment, preferably, the mounting plate 6 is a circular metal plate, and a plurality of screw holes (not shown in the figure) are arranged circumferentially on the mounting plate 6, which is fixed to a housing (not shown in the figure) on which the axial flow fan device is installed by screws.

[0037] In this embodiment, preferably, the air inlet side end portion 51 of the second air guide ring 5 is bent outward in an arc shape to transition and connect to the mounting plate 6 .

[0038] In the above structure, the inner second air guide ring 5 is connected to the mounting plate 6 by an arc bending structure at the transition point of the end on the air inlet side, and cooperates with the blades of the fan blade 1 to make the incoming wind field smoother, which is beneficial to reducing the wind inlet resistance, thereby optimizing the wind flow direction and improving the wind flow utilization rate.

[0039] In this embodiment, the mounting plate 6 is further preferably formed by bending and stretching the air inlet side end 51 of the second air guide ring 5 outwardly, and an arc transition is adopted at the bending part, and the air inlet side end 41 of the first air guide ring 4 is connected to the mounting plate 6. The air inlet side end 41 of the first air guide ring 4 and the mounting plate 6 can be connected by welding or riveting.

[0040] In the above structure, the inner second air guide ring 5 and the mounting plate 6 are integrated, and the arc at the transition is stretched out by a mold. This structure has the best air guide effect. Of course, the second air guide ring 5 can also be made separately, and the air inlet side end 51 of the second air guide ring 5 is bent outward and then fixedly connected to the mounting plate 6 by welding or riveting.

[0041] In this embodiment, it is also preferred that the axial length of the second air guide ring 5 is consistent with the axial thickness of the fan blade 1, and the axial length of the first air guide ring 4 is at least 1.3 times the axial length of the second air guide ring 5. The specific length may need to be matched according to the performance of the fan, and it is more preferred that the axial length of the first air guide ring 4 is 1.5 times the axial length of the second air guide ring 5. The length ratio setting in this structure has been verified by a large number of experiments, which can ensure the wind gathering and guiding effect of the wind flow direction without affecting the normal wind flow direction and adding too much weight.

[0042] In the present embodiment, it is further preferred that the radial gap between the first air guide ring 4 and the second air guide ring 5 is 10-30 mm, and it is further preferred that the gap is 15 mm, which can not only achieve a better air gathering and guiding effect, but also provide installation space for the motor bracket 3.

[0043] The radial clearance at the blade tip between the radial top of the fan blade 1 and the air inlet side end 51 of the second air guide ring 5 has a relatively large influence on the pressure head, efficiency and noise performance of the axial flow fan. When the axial flow fan is working, there will be a large pressure difference between the pressure surface and the suction surface of the axial flow fan blade 1. When the radial clearance at the blade tip of the axial flow fan is too large, the pressure difference between the pressure surface and the suction surface will cause the airflow to flow back along the radial clearance at the blade tip, causing leakage loss at the blade tip and reducing the efficiency of the axial flow fan. When the radial clearance at the blade tip is too small, although the problem of leakage loss at the blade tip is solved, when the axial flow fan is in an unstable working state such as when foreign matter is embedded, it is easy to cause blade breakage, or the blade and the air guide ring to freeze at low temperatures and cannot operate.

[0044] In the present embodiment, it is further preferred that the blade tip radial gap between the radial top of the fan blade 1 and the air inlet side end 51 of the second air guide ring 5 is set to 5 mm, which, together with the arc structure of the air inlet side end 51 of the second air guide ring 5, can effectively reduce the leakage loss at the blade tip radial gap, thereby improving the air volume and efficiency of the axial flow fan. At the same time, due to the wider blade tip radial gap, when the axial flow fan is in an unstable working state, such as when foreign matter is embedded or the temperature is low, the fan blade 1 can operate normally, thereby improving the safety of the axial flow fan during operation.

[0045] In this embodiment, the motor bracket 3 includes a motor fixing frame 31 and a plurality of branch connecting frames 32. The motor 2 is mounted on the motor fixing frame 31. The motor fixing frame 31 is a ring structure and is located at the center of the motor bracket 3. It is coaxially arranged with the fan blade 1, the first air guide ring 4 and the second air guide ring 5. The plurality of branch connecting frames 32 extend radially outward from the motor fixing frame 31.

[0046] like Figure 1 As shown, in this embodiment, preferably, four branch connecting frames 32 are arranged outwardly with the motor fixing frame 31 as the center, and the four branch connecting frames 32 are arranged in a cross shape. Each branch connecting frame 32 is formed by bending a metal strip, and the whole is a U-shaped structure. One end of the four branch connecting frames 32 is welded to the motor fixing frame 31.

[0047] In the present embodiment, it is further preferred that the branch connecting frame 32 is composed of a continuous first section 321 extending radially and a second section 322 extending axially, and the second section 322 is placed between the first air guide ring 4 and the second air guide ring 5, and the top end of the second section 322 is connected to the mounting plate 6, which can be connected by welding or riveting.

[0048] In the present embodiment, it is further preferred that a plurality of sockets (not shown in the figure) are provided on the first air guide ring 4 corresponding to the branch connecting frame 32, four sockets are provided along the circumferential direction and are provided at the connection between the mounting plate 6 and the first air guide ring 4, the top end of the branch connecting frame 32 extends horizontally and passes through the sockets to be connected and fixed to the mounting plate 6, and the top end of the branch connecting frame 32 and the mounting plate 6 also need to be welded or riveted together to ensure that the motor 2 is firmly and stably fixed.

[0049] The motor bracket 3 adopts the above structure, the overall structure is simple, the installation is convenient, and it can ensure that the motor 2 is firmly and stably fixed without affecting the flow field on the air outlet side.

[0050] The axial flow fan provided in this embodiment has the following advantages:

[0051] 1. In the utility model, since the end of the outlet side of the first air guide circle protrudes outwardly from the end of the outlet side of the second air guide circle in the axial direction, when the axial flow fan is installed in a place with limited space and insufficient air inlet space for the fan, since the length of the first air guide circle in the axial direction is longer than that of the second air guide circle, after the outlet air leaves the second air guide circle, the first air guide circle can play a blocking and gathering effect, and is used to block the wind flow from dissipating in the radial direction, thereby guiding the wind blown horizontally in the radial direction to be blown out in the axial direction of the axial flow fan, which not only solves the problem of short circuit between the fan inlet and outlet, but also makes the wind flow more concentrated, reduces the wind flow dispersion phenomenon, and further optimizes the wind guiding effect of the axial flow fan.

[0052] 2. The second inner air guide ring of the utility model adopts an arc bending structure to be connected to the mounting plate at the transition point of the end on the air inlet side, which cooperates with the blades of the fan blades to make the incoming wind field smoother, which is beneficial to reducing the wind inlet resistance, thereby optimizing the wind flow direction and improving the wind flow utilization rate.

[0053] 3. The axial flow fan can be used as the condensing fan of the air conditioner, and can also be used in other equipment that uses axial flow fans for heat dissipation.

[0054] Embodiment 2:

[0055] This embodiment provides an air conditioning unit installed on large passenger cars, subways, EMUs, high-speed railways, energy storage cabinets and other equipment.

[0056] The air-conditioning unit has a unit structure. The space inside the shell is divided into an indoor cavity and an outdoor cavity by a partition. The evaporator, evaporating fan and other components are installed in the indoor cavity, and the condenser, condensing fan, compressor and other components are installed in the outdoor cavity. The condensing fan can adopt the axial flow fan provided in Example 1.

[0057] The mounting plate 6 of the axial flow fan is fixed to the top plate of the air conditioning unit housing by multiple screws, and a condensation outlet is correspondingly arranged on the top plate of the housing corresponding to the axial flow fan. In the outdoor cavity of the air conditioning unit, generally multiple axial flow fans are installed, such as 2-6, depending on the heat exchange demand of the condenser of the air conditioning unit.

[0058] The above is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. An axial flow fan, comprising a fan blade, a motor and a motor bracket, characterized in that: A first air guide ring and a second air guide ring are coaxially arranged on the outside of the fan blade. The second air guide ring is nested and installed inside the first air guide ring. The air inlet side ends of the first air guide ring and the second air guide ring are connected to the mounting plate, and the air outlet side end of the first air guide ring protrudes outwardly from the air outlet side end of the second air guide ring in the axial direction.

2. The axial flow fan according to claim 1, characterized in that: The end portion of the second air guide ring on the air inlet side is bent outward in an arc shape and connected to the mounting plate, and the end portion of the first air guide ring on the air inlet side is connected to the mounting plate.

3. The axial flow fan according to claim 2, characterized in that: The mounting plate is formed by bending and stretching the air inlet side end of the second air guide plate outwards to form an integral body.

4. The axial flow fan according to claim 1, characterized in that: The axial length of the second air guide ring is consistent with the axial thickness of the fan blade.

5. The axial flow fan according to claim 3, characterized in that: The axial length of the first air guide ring is at least 1.3 times the axial length of the second air guide ring.

6. The axial flow fan according to claim 1, characterized in that: The radial gap between the first air guide ring and the second air guide ring is 10-30 mm.

7. The axial flow fan according to claim 1, characterized in that: The radial gap between the top of the fan blade in the radial direction and the end of the second air guide ring on the air inlet side is 5 mm.

8. The axial flow fan according to any one of claims 1 to 7, characterized in that: It also includes a motor and a motor bracket, the motor bracket includes a motor fixing frame and a plurality of branch connecting frames, the motor is mounted on the motor fixing frame, the plurality of branch connecting frames extend radially outward from the motor fixing frame, the branch connecting frame is composed of a continuous first section extending radially and a second section extending axially, the second section is placed between the first air guide ring and the second air guide ring, and the top end of the second section is connected to the mounting plate.

9. The axial flow fan according to claim 8, characterized in that: A plurality of sockets are provided on the first air guide ring corresponding to the branch connecting frame, and the sockets are provided at the connecting end of the first air guide ring and the mounting connection, and the top end of the branch connecting frame extends horizontally and passes through the sockets to be connected and fixed to the mounting plate.

10. An air conditioning unit, characterized in that: An axial flow fan as described in any one of claims 1 to 9 is installed.

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