Heat recovery ventilator

Abstract

Disclosed in the present invention is a heat recovery ventilator, comprising a frame, a housing, a heat exchange rotor, a central shaft, a plurality of shaft seals, an outer rotor motor, and a motor support; the housing is mounted on the frame, the heat exchange rotor is rotatably mounted in the housing, the heat exchange rotor is fixed to an outer rotor motor housing by means of an inner fixing support, two ends of the central shaft are fixedly mounted on the frame, and the plurality of shaft seals are connected between the housing and the heat exchange rotor. The outer rotor motor is mounted in the middle of the inner cavity of the heat exchange rotor by means of the motor support, and a shaft of the outer rotor motor is fixedly connected to the central shaft. In the present invention, since the outer rotor motor provides rotating power for the heat exchange rotor, the structure is simple, and since an outer cylinder and an inner cylinder in the heat exchange rotor are conical cylinders, when the heat exchange rotor rotates, the centrifugal forces acting on dewdrops attached to the inner cylinder and the outer cylinder are different, the dewdrops concentrate in the axial direction under the action of the centrifugal forces and are transferred to a cold air passage at the shaft seals for evaporation, the flow velocity of the dewdrops is higher, and the heat exchange effect is better.

Description

Heat exchange fan TECHNICAL FIELD

[0001] The present application relates to a gas heat exchange device, in particular to a heat exchange fan. BACKGROUND

[0002] The heat recovery ventilator (HRV) is a kind of air supply and exhaust equipment with heat recovery function. It can recover cold and heat, save air conditioning energy, and minimize the impact on indoor temperature while improving indoor air quality. For example, the existing Lossnay heat exchanger (static full-heat heat exchanger) is shown in FIG. 1. The heat exchange core 1A includes flat paper and fin paper, which form mutually perpendicular air flow channels. This structure can separate the inhaled air and the discharged air in their respective air flow channels, without mixing, and can perform sensible heat exchange (heat conduction) and latent heat exchange (condensation-capillary action-evaporation) to introduce fresh air into the indoor environment. However, it has the following disadvantages:

[0003] 1. Two fans are needed to input and output air volume;

[0004] 2. The thermal resistance and flow resistance are large, resulting in poor heat exchange and large power consumption;

[0005] 3. Paper consumables need to be replaced frequently;

[0006] 4. Condensed water cannot be well exchanged, resulting in low latent heat exchange efficiency in actual use;

[0007] 5. Paper materials can only be used for building energy-saving fresh air when the indoor and outdoor temperature difference is large.

[0008] In addition, as shown in FIG. 2, a new fan is disclosed in Chinese patent (Patent No. 202210785997.0), which includes a housing 1', a heat exchange rotor 2', a shaft 3', a plurality of shaft seals 4', and a rack. The housing 1' is installed on the rack, the heat exchange rotor 2' is rotatably installed in the housing 1', the middle part of the heat exchange rotor 2' is fixedly sleeved on the middle part of the shaft 3', the two ends of the heat exchange rotor 2' are fixed on the two sides of the shaft 3', the end part of the shaft 3' is connected with power, and the housing 1' and the heat exchange rotor 2' are connected with a plurality of shaft seals 4'. This patent has the following defects:

[0009] 1. The heat exchange rotor 2' of this patent has no duct structure design, the heat exchange area is small, and the heat exchange efficiency is low.

[0010] 2. The heat exchange rotor 2' of this patent includes a body 21', two groups of hollow blade groups 22', and a group of heat exchangers 23', which has a complex structure.

[0011] 3. Because the cold and hot air outlet of the patent is asymmetrically arranged, it cannot be used as the opposite working condition in winter and summer.

[0012] 4. Because the power of the patent comes from the outside, the installation is more complex. SUMMARY

[0013] The purpose of the present application is to provide a heat exchange fan with high heat exchange efficiency and suitable for different seasons.

[0014] To achieve the above purpose, the technical solution of the present application is:

[0015] The present application is a heat exchange fan, comprising a rack, a shell, a heat exchange rotor, a middle shaft and a plurality of shaft seals. The shell is installed on the rack, and the heat exchange rotor is rotatably installed in the shell. The heat exchange rotor is fixed on the outer rotor motor shell by an internal fixed support. The two ends of the middle shaft are fixedly installed on the rack. A plurality of shaft seals are connected between the shell and the heat exchange rotor. The heat exchange rotor comprises an outer cylinder, an inner cylinder, a plurality of heat exchange blades and spokes. The inner cylinder is sleeved in the outer cylinder. The two ends of the inner cylinder and the outer cylinder are respectively provided with spokes. An inner space is formed between the outer wall of the inner cylinder, the inner wall of the outer cylinder and the two spokes. An outer space is formed between the shell and the outer wall of the outer cylinder. First and second air inlets are distributed and arranged on the two spokes. The first air inlet is in communication with one end of the outer cylinder, and the second air inlet is in communication with one end of the inner cylinder. First and second air outlets are respectively arranged at the two ends of the shell. The first air inlet, the inner space and the first air outlet are in communication to form a first airflow channel. The two ends of the plurality of heat exchange blades are respectively connected to the inner cylinder and the outer cylinder, and the plurality of heat exchange blades are arranged along the axial direction of the inner cylinder. The second air inlet, the inner cavity of the inner cylinder, the hollow cavities of the plurality of heat exchange blades, the outer space and the second air outlet are in communication to form a second airflow channel. The present application further comprises an outer rotor motor and a motor support. The outer rotor motor is installed in the middle part of the inner cavity of the heat exchange rotor through the motor support. The outer rotor motor drives the heat exchange rotor to rotate through the support. The shaft of the outer rotor motor is fixedly connected with the middle shaft.

[0016] The outer cylinder and the inner cylinder in the heat exchange rotor are conical cylinders.

[0017] Shaft seals are arranged between the spokes at the two ends and the two sides of the inner cylinder. Shaft seals that can transfer condensed water are arranged between the outer cylinder and the shell. Shaft seals are arranged between one side of the outer cylinder and the spoke on the same side.

[0018] One end of the outer cylinder is provided with a baffle. The baffle is located at the shaft seal between the outer cylinder and the shell.

[0019] The first air outlet and the second air outlet are symmetrically arranged at the two ends of the shell.

[0020] The heat exchange blade comprises a blade body and a plurality of conduits; the blade body has a hollow inner cavity forming a radial airflow passage of the blade body; the plurality of conduits are distributed on the blade body in a transverse direction, two ends of the conduit penetrating through the hollow inner cavity of the blade body and being fixed on two opposite side walls of the hollow inner cavity, and a through hole in the middle of the conduit being communicated with the outside, the through hole in the middle of the conduit forming an axial airflow passage of the conduit.

[0021] The blade body is in a cross-section shape of an airfoil.

[0022] The hollow inner cavity of the blade body has a larger diameter at one end than at the other end.

[0023] The first air inlet, the inner space, the conduit in the heat exchange blade and the first air outlet are communicated with each other to form a first airflow passage.

[0024] The heat exchange blade comprises a blade body; the blade body has a hollow inner cavity forming a radial airflow passage of the blade body, the blade body is in a cross-section shape of an airfoil, and the hollow inner cavity of the blade body has a larger diameter at one end than at the other end.

[0025] The shaft seal is composed of an outer shaft seal and an inner shaft seal; the outer shaft seal is fixedly installed on the inner wall of the shell, the inner shaft seal is fixedly installed on the outer wall of the heat exchange rotor outer cylinder, and the outer shaft seal is opposite to the inner shaft seal; a water collecting chamber is formed at the inner shaft seal of the outer wall of the outer cylinder, and a drain hole is formed at the water collecting chamber and communicated with the inner cavity of the outer cylinder; a flushing port is formed on the outer wall of the shell and communicated with the inner cavity of the shell, a water distribution chamber is arranged at the outer shaft seal of the shell, and a water discharge port is arranged at the bottom of the shell.

[0026] After the above scheme is adopted, the present application has the following advantages:

[0027] 1. Since the present application comprises an outer rotor motor and a motor support, the outer rotor motor provides rotating power for the heat exchange rotor, and the structure is relatively simple.

[0028] 2. Since the first air outlet and the second air outlet are symmetrically arranged at two ends of the shell, the first air outlet and the second air outlet can be reversed in different seasons, for example, the first air outlet and the second air outlet originally arranged in the room and outside the room can be exchanged, and the first air outlet and the second air outlet are arranged outside the room and in the room respectively, so that the purpose of providing cooling in summer and heating in winter is achieved.

[0029] 3. Since the heat exchange blade of the present application comprises a blade body and a plurality of conduits, when the blade impeller rotor rotates around the shaft, dewdrops will be formed on the surface of the blade body, the dewdrops will flow in the through hole in the middle of the conduit on the surface of the blade body to achieve latent heat exchange, the heat exchange area is increased, and the heat exchange efficiency is greatly improved.

[0030] 4. Since the outer cylinder and the inner cylinder in the heat exchange rotor of the application are conical cylinders, the centrifugal forces of the dew drops attached to the walls of the outer cylinder and the inner cylinder are different when the heat exchange rotor rotates, the dew drops will concentrate along the axial direction under the action of the centrifugal force, the flow speed of the dew drops is faster, and the heat exchange effect is better.

[0031] The application will be further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 is a schematic view of a conventional heat exchange core;

[0033] Fig. 2 is a schematic view of a prior art fresh air fan;

[0034] Fig. 3 is a schematic view of the structure of a first embodiment of the application;

[0035] Fig. 4 is an enlarged view of a portion of Fig. 3 at A;

[0036] Fig. 5 is a schematic view of the structure of a first embodiment of the heat exchange rotor of the application;

[0037] Fig. 6 is a sectional view of the first embodiment of the heat exchange rotor of the application;

[0038] Fig. 7 is an axonometric view of a first embodiment of the heat exchange blade of the application;

[0039] Fig. 8 is a sectional view of the structure of a first embodiment of the heat exchange blade of the application;

[0040] Fig. 9 is a schematic view of the structure of a second embodiment of the heat exchange rotor of the application;

[0041] Fig. 10 is a schematic view of the structure of a second embodiment of the heat exchange rotor of the application;

[0042] Fig. 11 is an axonometric view of a second embodiment of the heat exchange blade of the application. Embodiment of the application

[0043] As shown in Figs. 3-11, a first embodiment of a heat exchange fan of the application comprises a frame 1, a housing 2, a heat exchange rotor 3, a central shaft 4, a plurality of shaft seals 5, an outer rotor motor 6 and a motor support 7.

[0044] The housing 2 is mounted on the frame 1, the heat exchange rotor 3 is rotatably mounted in the housing 2, the two ends of the heat exchange rotor 3 are movably sleeved on the two sides of the central shaft 4, the two ends of the central shaft 4 are fixedly mounted on the frame 1, and a plurality of shaft seals 5 are connected between the housing 2 and the heat exchange rotor 4. The outer rotor motor 6 is mounted in the middle part of the inner cavity of the inner cylinder 32 of the heat exchange rotor 3 through the motor support 7, the outer rotor motor 6 drives the heat exchange rotor 3 to rotate through the support 1, and the shaft of the outer rotor motor 6 is fixedly connected with the central shaft 4.

[0045] The heat exchange rotor 3 comprises an outer cylinder 31, an inner cylinder 32, a plurality of heat exchange blades 33, and spokes 34; the outer cylinder 31 and the inner cylinder 32 are conical cylinders, the inner cylinder 32 is gap-suitably arranged in the outer cylinder 31, spokes 34 are respectively arranged at both ends of the inner cylinder 32 and the outer cylinder 31, an inner space N is formed between the outer wall of the inner cylinder 32, the inner wall of the outer cylinder 31 and the two spokes 34, an outer space W is formed between the outer shell 2 and the outer wall of the outer cylinder 31, first air inlets 341 and second air inlets 342 are distributed and arranged on the two spokes 34, the first air inlets 341 are communicated with one end of the outer cylinder 31, the second air inlets 342 are communicated with one end of the inner cylinder 32, first air outlets 21 and second air outlets 22 are respectively arranged at both ends of the outer shell 2, the first air outlets 21 and the second air outlets 22 are symmetrically arranged, the first air inlets 341, the inner space N and the first air outlets 21 are communicated with each other to form a first airflow channel, both ends of the plurality of heat exchange blades 33 are respectively connected to the inner cylinder 32 and the outer cylinder 31, and the plurality of heat exchange blades 33 are arranged at intervals along the axial direction of the inner cylinder, the second air inlets 342, the inner cavity of the inner cylinder 32, the hollow cavities of the plurality of heat exchange blades 33, the outer space W and the second air outlets 22 are communicated with each other to form a second airflow channel; the shaft seals 5 are arranged between the two spokes 34 at both ends and both sides of the inner cylinder 31, between the outer cylinder 31 and the outer shell 2, and between one side of the outer cylinder 31 and the spoke 34 on the same side, and a baffle 311 is arranged at one end of the outer cylinder 31, which is located at the shaft seal 5 between the outer cylinder 31 and the outer shell 2.

[0046] As shown in Figure 4, the shaft seal 5 is composed of an outer shaft seal 51 and an inner shaft seal 52; the outer shaft seal 51 is fixedly installed on the inner wall of the outer shell 1, the inner shaft seal 52 is fixedly installed on the outer wall of the outer cylinder 31 of the heat exchange rotor 3, and the outer shaft seal 51 is arranged opposite to the inner shaft seal 52; a water collecting chamber 53 is arranged at the inner shaft seal 52 of the outer wall of the outer cylinder 31, and a drain hole 54 is arranged at the water collecting chamber 53, which is communicated with the inner cavity of the outer cylinder 31.

[0047] A flushing port 11 is arranged on the outer wall of the outer shell 1, which is arranged at the outer shaft seal 51 of the outer shell 1 and communicated with the inner cavity of the outer shell 1. A water distribution chamber 12 is arranged at the outer shaft seal 51 of the outer shell 1, and a water drainage port 55 is arranged at the bottom of the outer shell 1.

[0048] The heat exchange blade has two embodiments, as shown in FIG. 7 and FIG. 8, which is the first embodiment of the heat exchange blade 33, comprising a blade body 331 and a plurality of conduits 332; the blade body 331 is cross-sectionally airfoil-shaped, and has a hollow inner cavity 3311 forming a radial airflow channel of the blade body 331, the blade body 331 is cross-sectionally airfoil-shaped, and the inner cavity of the blade body 331 has a larger diameter at one end and a smaller diameter at the other end; the plurality of conduits 332 are distributed transversely on the blade body 331, and the two ends of the conduit 332 pass through and are fixed on the opposite two side walls of the hollow inner cavity of the blade body 331, and the through hole 3321 in the middle of the conduit 332 is in communication with the outside, forming an axial airflow channel of the conduit 332.

[0049] The inner cavity of the blade body 331 has a larger diameter at one end and a smaller diameter at the other end, the smaller end 3312 is the cold air inlet, and the larger end 3313 is the cold air outlet.

[0050] In this embodiment, the first air inlet 341, the inner space N, the conduit 332 in the heat exchange blade 33, and the first air outlet 21 are in communication to form a first airflow channel.

[0051] As shown in FIG. 9, which is the second embodiment of the heat exchange fan of the present application, the structure is the same as the first embodiment, except that the heat exchange rotor 3 is arranged with the heat exchange blade 33 of the first embodiment and the heat exchange blade 33A of the second embodiment. As shown in FIG. 10 and FIG. 11, the heat exchange blade 33A comprises a blade body 331A; the blade body 331A is cross-sectionally airfoil-shaped, and has a hollow inner cavity 3311A forming a radial airflow channel of the blade body 331A, the blade body 331A is cross-sectionally airfoil-shaped, and the inner cavity of the blade body 331A has a larger diameter at one end and a smaller diameter at the other end, i.e., the inner cavity of the blade body 331A has a larger diameter at one end and a smaller diameter at the other end, the smaller end 3312A is the cold air inlet, and the larger end 3313A is the cold air outlet.

[0052] In combination with FIG. 3, the working principle of the present application is as follows:

[0053] 1. For improving the indoor air temperature: the first air outlet 21 and the second air outlet 22 of the heat exchange rotor 3 are arranged in the indoor and outdoor respectively, when the machine is started, the outer rotor motor drives the heat exchange rotor 3 to rotate, the hot air in the indoor flows into the first air inlet 341 of the heat exchange rotor 3, and then flows out from the first air outlet 21 after passing through the inner space N and the conduit 332 in the heat exchange blade 33, at the same time, the cold air in the outdoor flows into the second air inlet 342 of the heat exchange rotor 3, and then flows out from the second air outlet 22 after passing through the inner cavity of the inner cylinder 32, the hollow inner cavities of the plurality of heat exchange blades 33, and the outer space W.

[0054] 2. For reducing the indoor air inlet temperature: the first air outlet 21 and the second air outlet 22 originally placed in the indoor and outdoor respectively are switched, and the first air outlet 31 and the second air outlet 33 are placed in the outdoor and indoor respectively, and the working process is the same as the first one.

[0055] 3. Since the heat exchange blade 33 of the application comprises the blade body 331 and the plurality of conduits 332, when the blade-equipped impeller rotor rotates around the shaft, dew drops are formed on the surface of the blade body 331, and the dew drops flow in the through holes in the middle of the conduits 332 to realize latent heat exchange, the heat exchange area and temperature difference are increased, and the heat exchange efficiency is greatly improved.

[0056] 4. Since the outer cylinder 31 and the inner cylinder 32 in the heat exchange rotor 3 are conical cylinders, when the heat exchange rotor 3 rotates, the centrifugal forces of the dew drops attached to the inner wall of the outer cylinder 31 are different, the dew drops are concentrated in the axial direction under the action of the centrifugal force, and are transferred to the cold air passage at the shaft seal to evaporate, the dew drop flow speed is faster, and the heat exchange effect is better.

[0057] The above description is only the preferred embodiment of the application, and therefore cannot limit the scope of the application, that is, equivalent changes and modifications made according to the patent application scope and the content of the specification should still be within the scope of the application.

Claims

1. A heat exchange fan, comprising a frame, a shell, a heat exchange rotor, a middle shaft, and a plurality of shaft seals; the shell is mounted on the frame, the heat exchange rotor is rotatably mounted in the shell, the heat exchange rotor is fixed on the outer rotor motor shell by an internal fixed support, the two ends of the middle shaft are fixedly mounted on the frame, and the shell and the heat exchange rotor are connected by the plurality of shaft seals; the heat exchange rotor comprises an outer cylinder, an inner cylinder, a plurality of heat exchange blades, and spokes; the inner cylinder is sleeved in the outer cylinder, the two ends of the inner cylinder and the outer cylinder are respectively provided with spokes, an inner space is formed between the outer wall of the inner cylinder, the inner wall of the outer cylinder, and the two spokes, an outer space is formed between the shell and the outer wall of the outer cylinder, first and second air inlets are distributed and arranged on the two spokes, the first air inlet is communicated with one end of the outer cylinder, the second air inlet is communicated with one end of the inner cylinder, first and second air outlets are respectively arranged at the two ends of the shell, the first air inlet, the inner space, and the first air outlet are communicated to form a first airflow channel, the two ends of the plurality of heat exchange blades are respectively connected to the inner cylinder and the outer cylinder, and the plurality of heat exchange blades are arranged along the axial direction of the inner cylinder, the second air inlet, the inner cavity of the inner cylinder, the hollow cavities of the plurality of heat exchange blades, the outer space, and the second air outlet are communicated to form a second airflow channel; characterized in that: Also include outer rotor motor and motor support; the outer rotor motor is installed in the middle of the inner cavity of the heat exchange rotor through the motor support, the outer rotor motor drives the heat exchange rotor to rotate through the motor support, and the shaft of the outer rotor motor is fixedly connected with the middle shaft.

2. The heat exchanger fan of claim 1, wherein: The outer cylinder and the inner cylinder in the heat exchange rotor are conical cylinders.

3. The heat exchanger fan of claim 1, wherein: The inner cylinder is provided with shaft seals between the two ends and the spokes on both sides; the outer cylinder is provided with shaft seals between the outer shell and the outer cylinder, and the shaft seals can transfer condensed water; one side of the outer cylinder is provided with a shaft seal between the spoke on the same side.

4. The heat exchanger fan of claim 1, wherein: One end of the outer cylinder is provided with a eave, which is located at the shaft seal between the outer cylinder and the outer shell.

5. The heat exchanger fan of claim 1, wherein: The first air outlet and the second air outlet are symmetrically arranged at the two ends of the outer shell.

6. The heat exchanger fan of claim 1, wherein: The heat exchange blade includes a blade body and a plurality of conduits; the blade body has a hollow inner cavity forming a radial airflow passage of the blade body; the plurality of conduits are distributed transversely on the blade body, the two ends of the conduit pass out and are fixed on the opposite two side walls of the hollow inner cavity of the blade body, and the through hole in the middle of the conduit is in communication with the outside, and the through hole in the middle of the conduit forms an axial airflow passage of the conduit.

7. The heat exchanger fan of claim 6, wherein: The cross section of the blade body is wing-shaped.

8. The heat exchanger fan of claim 6, wherein: The diameter of one end of the hollow inner cavity of the blade body is larger than that of the other end.

9. The heat exchanger fan of claim 6, wherein: The first air inlet, the inner space, the conduit in the heat exchange blade, and the first air outlet are in communication to form a first airflow passage.

10. The heat exchanger fan of claim 1, wherein: The heat exchange blade includes a blade body; the blade body has a hollow inner cavity forming a radial airflow passage of the blade body, the cross section of the blade body is wing-shaped, and the diameter of one end of the hollow inner cavity of the blade body is larger than that of the other end.

11. The heat exchanger fan of claim 1, wherein: The shaft seal is composed of an outer shaft seal and an inner shaft seal; the outer shaft seal is fixedly installed on the inner wall of the outer shell, the inner shaft seal is fixedly installed on the outer wall of the outer cylinder of the heat exchange rotor, and the outer shaft seal and the inner shaft seal are arranged opposite to each other; a water collecting chamber is formed at the inner shaft seal of the outer wall of the outer cylinder, and a drain hole is formed at the water collecting chamber, which is in communication with the inner cavity of the outer cylinder; a flushing port is formed on the outer wall of the outer shell, which is formed at the outer shaft seal of the outer shell and is in communication with the inner cavity of the outer shell, a water distribution chamber is arranged at the outer shaft seal of the outer shell, and a water drainage port is arranged at the bottom of the outer shell.

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