Improved structure of fresh air machine

Abstract

The utility model discloses an improved structure of a fresh air machine. The improved structure comprises a machine frame, a shell, a heat exchange rotor, a rotating shaft and a plurality of labyrinth type air seals. The shell is installed on the machine frame, the heat exchange rotor is rotatably installed in the shell, the middle of the heat exchange rotor is fixedly connected to the middle of the rotating shaft in a sleeved mode, the two ends of the heat exchange rotor are fixed to the two sides of the rotating shaft, the ends of the rotating shaft are externally connected with power, and a plurality of labyrinth type air seals are connected between the shell and the heat exchange rotor. The heat exchange rotor comprises a body, two groups of hollow blade groups and more than one group of heat exchangers, each heat exchanger is composed of more than two groups of heat exchange blades, and two ends of each heat exchange blade are respectively connected onto end plates of the two groups of hollow blade groups. Due to the fact that a tubular heat exchange tube is replaced by the wing-shaped blades, the driving effect on air is increased through the heat exchange blades, and the heat exchange effect is improved. In addition, the hollow blades are longitudinally provided with gradients, the upstream of hot air is closer to the rotating shaft, and cold condensed water of the heat exchanger can be easily discharged under the action of centrifugal force.

Description

Technical Field

[0001] The utility model relates to a gas heat exchange device, in particular to an improved structure of a fresh air fan. Background Art

[0002] A total heat exchange fresh air fan (HRV, Heat recovery ventilator) is a supply and exhaust air device with a heat recovery function. It achieves the purpose of recovering cooling capacity and heat, saves air conditioning energy, and minimizes the impact on the indoor temperature on the basis of improving the indoor air quality. For example, the existing Lossnay heat exchanger (stationary total heat exchanger), as Figure 1 shown, the heat exchange core 1A includes air flow channels perpendicular to each other formed by flat paper and finned paper. This structure can separate the inhaled air and the exhausted air in their respective air flow channels without mixing, and at the same time can perform sensible heat exchange (heat conduction) and latent heat exchange (condensation - capillary action - evaporation) to introduce fresh air into the indoor environment. However, its disadvantages are as follows:

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

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

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

[0006] 4. Condensate cannot be exchanged well, 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 Figure 2 shown, a Chinese patent (patent number 202210785997.0) discloses a fresh air fan, which includes a housing 1', a heat exchange rotor 2', a rotating shaft 3', a plurality of labyrinth seals 4', and a frame. The housing 1' is installed on the frame, 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 rotating shaft 3', both ends of the heat exchange rotor 2' are fixed on both sides of the rotating shaft 3', the end of the rotating shaft 3' is externally connected to power, and a plurality of labyrinth seals 4' are connected between the housing 1' and the heat exchange rotor 2'. This patent has the following defects:

[0009] (1) When the middle section of the fan heat exchange rotor 2' is a heat exchanger 23' and its shape is tubular, airfoil-shaped hollow blades with a driving air function are not used, and various air friction resistances lead to an increase in power consumption; (2) For the tubular heat exchanger 23', it does not have a certain slope longitudinally, resulting in difficulty in discharging condensate; (3) The outer cylinder 212' and the inner cylinder 211' do not have a taper longitudinally, resulting in difficulty for the condensate to flow downstream to the hot air; (4) The specific surface area per unit volume of the blade body of the hollow leaf is small, which is not conducive to the miniaturization of the fan heat exchange rotor. Summary of the Invention

[0010] The purpose of the present invention is to provide an improved structure of a new air blower with high heat exchange efficiency and easy discharge of condensed water.

[0011] To achieve the above purpose, the technical solution of the present invention is:

[0012] The present invention is an improved structure of a new air blower, including a frame, a housing, a heat exchange rotor, a rotating shaft, and a plurality of labyrinth seals; the housing is installed on the frame, the heat exchange rotor is rotatably installed in the housing, the middle part of the heat exchange rotor is fixedly sleeved on the middle part of the rotating shaft, both ends of the heat exchange rotor are fixed on both sides of the rotating shaft, the end of the rotating shaft is externally connected to power, and a plurality of labyrinth seals are connected between the housing and the heat exchange rotor;

[0013] The heat exchange rotor includes a body, two groups of hollow blade groups, and one or more groups of heat exchangers; the body is an annular barrel-shaped structure, the two groups of hollow blade groups and one or more groups of heat exchangers are all installed in the body, and one group of heat exchangers is connected between the two groups of hollow blade groups;

[0014] The hollow blade group is composed of a plurality of hollow blades; the body comprises an inner tube, an outer tube, and spokes; the inner tube and the outer tube are fixedly sleeved on the rotating shaft in sequence, and spokes are respectively installed at both ends of the inner tube and the outer tube, and an inner space is formed between the outer wall of the inner tube, the inner wall of the outer tube, and the two spokes, and a first air inlet and a first air outlet are respectively formed in the gap between the two spokes, and the first air inlet, the inner space, and the first air outlet are interconnected to form a first air flow channel; an outer space is formed between the outer shell and the outer wall of the outer tube, a second air inlet is opened at one end of the inner tube, and a second air outlet is opened on the outer wall of the outer shell, and the two ends of the plurality of hollow blades are respectively Connected to the inner tube and the outer tube, the second air inlet, the inner cavity of the inner tube, the inner cavities of each hollow blade of the hollow blade group, the external space, and the second air outlet are interconnected to form a second airflow channel; the heat exchanger includes a plurality of airfoil blades and a plurality of heat exchange tubes; both ends of the plurality of airfoil blades and the plurality of heat exchange tubes are respectively connected to the end plates of the two groups of hollow blade groups, the ends of the plurality of airfoil blades are fixed at intervals on a circumferential line of the end plate and are arranged around the rotating shaft, the ends of the plurality of heat exchange tubes are fixed at intervals on more than two circumferential lines of the end plate and are arranged around the rotating shaft, and the plurality of heat exchange tubes arranged in a ring shape are located on the inner side of the plurality of airfoil blades.

[0015] The airfoil-shaped blade is in the shape of an elongated strip and has an airfoil-shaped cross section, and has a through hole running through the entire length thereof.

[0016] The heat exchange tube is a long elliptical tube.

[0017] The hollow blade is a heat exchange blade, which includes a blade body and multiple conduits; the blade body has a hollow inner cavity, forming a radial airflow channel of the blade body; the multiple conduits are respectively inserted into the blade body in the transverse direction, and the two ends of the conduits are respectively fixed on the two opposite side walls of the hollow inner cavity of the blade body, and the through hole in the middle of the conduit is connected to the outside, and the through hole in the middle of the conduit forms an axial airflow channel of the conduit.

[0018] The hollow blade group is composed of a plurality of heat exchange blades;

[0019] The hollow blade is a hollow blade with an internal cavity.

[0020] The hollow blade group is composed of a plurality of hollow blades;

[0021] The hollow blade group consists of a plurality of heat exchange blades and a plurality of hollow blades.

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

[0023] The outer cylinder and the inner cylinder in the heat exchange rotor are conical cylinders.

[0024] The airfoil-shaped blades are obliquely fixed on the end plates of the two hollow blade groups.

[0025] After adopting the above solution, the utility model has the following advantages:

[0026] (1) The original heat exchanger only has various air friction resistances, which will lead to an increase in power consumption. After improvement, multiple airfoil blades of the utility model are used to replace the tubular heat exchange tubes. On the basis of maintaining the original heat exchange function, the multiple airfoil blades increase the driving effect on the air and improve the heat exchange efficiency. (2) Since the hollow blades of the utility model are longitudinally provided with slopes, the hot air upstream is closer to the rotating shaft, and under the action of centrifugal force, the condensed water in the heat exchanger is easily discharged. (3) Since the outer cylinder and the inner cylinder of the utility model are increased in taper, the diameter in the downstream direction of the hot air becomes larger, and under the action of centrifugal force, the condensed water is easily discharged into the labyrinth gland water collecting tank.

[0027] The following further describes the utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0028] Figure 1 is a schematic diagram of a traditional heat exchange core;

[0029] Figure 2 is a schematic diagram of a prior art fresh air fan;

[0030] Figure 3 is a schematic structural diagram of the utility model;

[0031] Figure 4 is Figure 3 a sectional view along the line A-A;

[0032] Figure 5 is an axonometric view of the airfoil blade of the utility model;

[0033] Figure 6 is an assembly drawing of the heat exchange rotor of the utility model;

[0034] Figure 7 is an axonometric view of the hollow blade of the utility model;

[0035] Figure 8 is an axonometric view of the hollow blade group assembled with the hollow blade of the utility model;

[0036] Figure 9 is an axonometric view of the heat exchange blade of the utility model;

[0037] Figure 10 is a sectional view of the heat exchange blade of the utility model;

[0038] Figure 11 is an axonometric view of the hollow blade group assembled with the heat exchange blade of the utility model;

[0039] Figure 12 isFigure 3 Partial enlarged view at position B. Detailed implementation mode

[0040] As Figure 3 、 Figure 4 shown in the figure, the utility model is an improved structure of a fresh air fan, which includes a housing 1, a heat exchange rotor 2, a rotating shaft 3, a plurality of labyrinth seals 4, and a frame (not shown in the figure).

[0041] The housing 1 is installed on the frame, 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 rotating shaft 3, both ends of the heat exchange rotor 2 are fixed on both sides of the rotating shaft 3, the end of the rotating shaft 3 is externally connected with power, and a plurality of labyrinth seals 4 are connected between the housing 1 and the heat exchange rotor 2.

[0042] The heat exchange rotor 2 includes a body 21, two groups of hollow blade groups 22, and a group of heat exchangers 23; the body 21 is of an annular barrel structure, two groups of hollow blade groups 22 and a group of heat exchangers 23 are both installed in the body 21, and a group of heat exchangers 23 is connected between the two groups of hollow blade groups 22, that is, a group of hollow blade groups 22, a group of heat exchangers 23, and a group of hollow blade groups 22 are connected in sequence.

[0043] Each hollow blade group 22 is composed of a plurality of hollow blades 221.

[0044] The body 21 includes an inner cylinder 211, an outer cylinder 212, and spokes 214; the inner cylinder 211 and the outer cylinder 212 are fixedly sleeved on the rotating shaft 3 in sequence, spokes 214 are installed at both ends of the inner cylinder 211 and the outer cylinder 212 respectively, an inner space N is formed between the outer wall of the inner cylinder 211, the inner wall of the outer cylinder 212, and the two spokes 214, a first air inlet 215 and a first air outlet 216 are formed in the gaps between the two spokes 214 respectively, and the first air inlet 215, the inner space N, and the first air outlet 216 communicate with each other to form a first air flow channel L1; an outer space W is formed between the housing 1 and the outer wall of the outer cylinder 212, a second air inlet 217 is opened at one end of the inner cylinder 211, a second air outlet 218 is opened on the outer wall of the housing 1, both ends of the plurality of hollow blades 221 are respectively connected to the inner cylinder 211 and the outer cylinder 212, and the second air inlet 217, the inner cavity of the inner cylinder 211, the inner cavities of the respective hollow blades 221 of the hollow blade group 22, the outer space W, and the second air outlet 218 communicate with each other to form a second air flow channel L2. The outer cylinder 212 and the inner cylinder 211 are conical cylinders, that is, the diameter of the upstream end of the hot air is smaller, and the diameter of the downstream end of the hot air is larger.

[0045] As Figures 7 - 11 shown in the figure, the hollow blade 221 has two structures: one is a heat exchange blade 221A, and the other is a hollow blade 221B.

[0046] The heat exchange vane 221A includes a vane body 2211A and a plurality of ducts 2212A; the cross-section of the vane body 2211A is wing-shaped, the vane body 2211A has a hollow inner cavity 22111A, forming a radial air flow channel of the vane body 2211A. The cross-section of the vane body 2211A is wing-shaped, and one end of the hollow inner cavity of the vane body 2211A has a larger diameter than the other end; the plurality of ducts 2212A are respectively arranged transversely on the vane body 2211A, and both ends of the duct 2212A penetrate out and are respectively fixed on two opposite side walls of the hollow inner cavity of the vane body 2211A, and the through hole in the middle of the duct 2212A communicates with the outside. The through hole 22121A in the middle of the duct 2212A forms an axial air flow channel of the duct 2212A.

[0047] One end of the hollow inner cavity of the vane body 2211A has a larger diameter than the other end, and its small end 22112A is the cold air inlet, and the large end 3313 is the cold air outlet.

[0048] The hollow vane 221B is a hollow vane 221B with an internal cavity.

[0049] Based on the fact that the hollow vane 221 has two structures, namely the heat exchange vane 221A and the hollow vane 221B, the hollow vane group 22 can be composed of three structures:

[0050] The first type of hollow vane group 22 is composed of a plurality of heat exchange vanes 221A; it is suitable for small equipment;

[0051] The second type of hollow vane group 22 is composed of a plurality of heat exchange vanes 221A and a plurality of hollow vanes 221B; it is suitable for medium-sized equipment;

[0052] The third type of hollow vane group 22 is composed of a plurality of hollow vanes 221B; it is suitable for large equipment.

[0053] Such as Figure 4 、 Figure 6As shown, the heat exchanger 23 includes a plurality of wing-shaped blades 231 and a plurality of heat exchange tubes 232; both ends of the plurality of wing-shaped blades 231 and the plurality of heat exchange tubes 232 are respectively connected to the end plates 222 of two sets of hollow blade groups 22. The wing-shaped blades 231 are fixed to the end plates 222 of the two sets of hollow blade groups 22 in an oblique manner, that is, the radius of the connection point between the outer edge of the wing-shaped blade 231 and the end plate 222 of the upstream end hollow blade group 22 and the rotating shaft 3 is smaller than the radius of the connection point between the outer edge of the wing-shaped blade 231 and the end plate 222 of the downstream end hollow blade group 22 and the rotating shaft 3. The ends of the plurality of wing-shaped blades 231 are fixedly spaced on a circumferential line of the end plate 222 and are arranged around the rotating shaft 3. The ends of the plurality of heat exchange tubes 232 are fixedly spaced on two circumferential lines of the end plate 222 and are arranged around the rotating shaft 3, forming two circles of heat exchange tubes 232. The plurality of heat exchange tubes 232 arranged in a ring shape are located inside the plurality of wing-shaped blades 231.

[0054] In this embodiment, the heat exchanger 23 includes a plurality of wing-shaped blades 231 in one circle and a plurality of heat exchange tubes 232 in two circles. The plurality of wing-shaped blades 231 in one circle are located on the periphery of the plurality of heat exchange tubes 232 in two circles.

[0055] Combined with Figure 5 As shown, the wing-shaped blade 231 is strip-shaped and has a wing-shaped cross-section, and has a through hole 2311 penetrating the entire length inside.

[0056] The heat exchange tube 232 is a strip-shaped elliptical tube.

[0057] Combined with Figure 12 As shown, the labyrinth gas seal 4 is composed of an outer labyrinth gas seal 41 and an inner labyrinth gas seal 42; the outer labyrinth gas seal 41 is fixedly installed on the inner wall of the outer shell 1, the inner labyrinth gas seal 42 is fixedly installed on the outer wall of the outer cylinder 212 of the heat exchange rotor 2 body 21, and the outer labyrinth gas seal 41 and the inner labyrinth gas seal 42 are arranged opposite to each other; a water collecting chamber 43 is opened at the position of the inner labyrinth gas seal 42 on the outer wall of the outer cylinder 212, and a drain hole 44 is opened at the water collecting chamber 43, and the drain hole 44 communicates with the inner cavity of the outer shell 1. In this embodiment, the labyrinth gas seal 4 adopts a labyrinth gas seal.

[0058] A flushing port 11 is opened on the outer wall of the outer shell 1. The flushing port 11 is opened at the position of the outer labyrinth gas seal 41 of the outer shell 1 and the flushing port 11 communicates with the inner cavity of the outer shell 1. A water distribution chamber 12 is provided at the position of the outer labyrinth gas seal 41 of the outer shell 1, and a water accumulation drain hole 45 is provided at the bottom of the outer shell 1.

[0059] Working principle of the present utility model

[0060] During the rotation of the hollow blades 221 in the first set of hollow blade sets 22, the air in their inner cavities is radially ejected under the action of centrifugal force. When flowing through the outer periphery of the heat exchanger 23, it is driven by the airfoil blades 231 to flow through the heat exchange tubes 232 to reach the shaft part, and then enters another set of hollow blade sets 22. The cold air is ejected again to the second air outlet 218. At the same time, the hot air in the outer space of the hollow blades 221 in the hollow blade sets 22 is axially pushed by the heat exchange blades 221A and flows downstream in the small tubes between multiple sets of hollow blades. After flowing through the heat exchanger 23, it is axially pushed by the hollow blades 221 in another hollow blade set 22 and discharged from the first air outlet 216. In the above cold and hot air channels, the entire heat exchange area is turbulent heat exchange. The condensed water formed in the hot air channel is ejected from the labyrinth seal 4 to the cold air channel L2 and evaporates or is discharged from the body in the cold air channel L2. After seasonal maintenance and water filling and cleaning, the drain hole 45 can be opened for discharge.

[0061] Advantages of the present utility model:

[0062] (1) The original heat exchanger only has various air frictional resistances, which will cause an increase in power consumption. After improvement, the heat exchanger 23 of the present utility model uses multiple airfoil blades 231 to replace the tubular heat exchange tubes. On the basis of maintaining the original heat exchange function, the multiple airfoil blades 231 increase the driving effect on the air and improve the heat exchange efficiency.

[0063] (2) Since the heat exchange blades 221A of the present utility model are longitudinally provided with a slope, the hot air is closer to the rotating shaft 3 upstream. Under the action of centrifugal force, the condensed water in the heat exchanger 23 is easily discharged.

[0064] (3) Since the outer cylinder 212 and the inner cylinder 211 of the present utility model increase the taper, the diameter in the downstream direction of the hot air becomes larger. Under the action of centrifugal force, the condensed water is easily discharged into the labyrinth seal water collecting tank.

[0065] (4) Since the present utility model adds heat exchange blades 221A with small tubes in the hollow blade sets 22, the heat exchange area per unit volume in the heat exchange rotor 2 is increased, which is beneficial to realizing miniaturization.

[0066] The above is only a preferred embodiment of the present utility model, and thus it cannot limit the scope of implementation of the present utility model. That is, equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the specification should still fall within the scope covered by the patent of the present utility model.

Claims

1. An improved structure of a fresh air blower, comprising a frame, a shell, a heat exchange rotor, a rotating shaft, and a plurality of labyrinth air seals; the shell is mounted on the frame, the heat exchange rotor is rotatably mounted in the shell, the middle of the heat exchange rotor is fixedly sleeved on the middle of the rotating shaft, the two ends of the heat exchange rotor are fixed on both sides of the rotating shaft, the ends of the rotating shaft are externally connected to power, and a plurality of labyrinth air seals are connected between the shell and the heat exchange rotor; The heat exchange rotor comprises a body, two groups of hollow blades, and one or more heat exchangers; the body is an annular barrel structure, the two groups of hollow blades and the one or more heat exchangers are installed in the body, and a heat exchanger is connected between the two groups of hollow blades; The hollow blade group is composed of a plurality of hollow blades; the body comprises an inner tube, an outer tube, and spokes; the inner tube and the outer tube are fixedly sleeved on the rotating shaft in sequence, and spokes are respectively installed at both ends of the inner tube and the outer tube, and an inner space is formed between the outer wall of the inner tube, the inner wall of the outer tube, and the two spokes, and a first air inlet and a first air outlet are respectively formed in the gap between the two spokes, and the first air inlet, the inner space, and the first air outlet are interconnected to form a first air flow channel; an outer space is formed between the outer shell and the outer wall of the outer tube, a second air inlet is opened at one end of the inner tube, and a second air outlet is opened on the outer wall of the outer shell, and the two ends of the plurality of hollow blades are respectively connected to the inner tube and the outer tube, and the second air inlet, the inner cavity of the inner tube, the inner cavities of each hollow blade of the hollow blade group, the outer space, and the second air outlet are interconnected to form a second air flow channel; it is characterized in that: The heat exchanger includes a plurality of airfoil blades and a plurality of heat exchange tubes; both ends of the plurality of airfoil blades and the plurality of heat exchange tubes are respectively connected to the end plates of the two groups of hollow blade groups, the ends of the plurality of airfoil blades are fixed at intervals on a circumferential line of the end plates and are arranged around a rotating shaft, the ends of the plurality of heat exchange tubes are fixed at intervals on more than two circumferential lines of the end plates and are arranged around a rotating shaft, and the plurality of heat exchange tubes arranged in a ring shape are located on the inner side of the plurality of airfoil blades.

2. The improved structure of the fresh air blower according to claim 1 is characterized in that: The airfoil-shaped blade is in the shape of an elongated strip and has an airfoil-shaped cross section, and has a through hole running through the entire length thereof.

3. The improved structure of the fresh air blower according to claim 1 is characterized in that: The heat exchange tube is a long elliptical tube.

4. The improved structure of the fresh air blower according to claim 1 is characterized in that: The hollow blade is a heat exchange blade, which includes a blade body and multiple conduits; the blade body has a hollow inner cavity, forming a radial airflow channel of the blade body; the multiple conduits are respectively inserted into the blade body in the transverse direction, and the two ends of the conduits are respectively fixed on the two opposite side walls of the hollow inner cavity of the blade body, and the through hole in the middle of the conduit is connected to the outside, and the through hole in the middle of the conduit forms an axial airflow channel of the conduit.

5. The improved structure of the fresh air blower according to claim 4 is characterized in that: The hollow blade group consists of a plurality of heat exchange blades.

6. The improved structure of the fresh air blower according to claim 1 is characterized in that: The hollow blade is a hollow blade with an internal cavity.

7. The improved structure of the fresh air blower according to claim 6 is characterized in that: The hollow blade group consists of a plurality of hollow blades.

8. The improved structure of the fresh air blower according to claim 4 or 6, characterized in that: The hollow blade group consists of a plurality of heat exchange blades and a plurality of hollow blades.

9. The improved structure of the fresh air blower according to claim 4 is characterized in that: The diameter of one end of the hollow inner cavity of the blade body is larger than the diameter of the other end.

10. The improved structure of the fresh air blower according to claim 1 is characterized in that: The outer cylinder and the inner cylinder in the heat exchange rotor are conical cylinders.

11. The improved structure of the fresh air blower according to claim 1 is characterized in that: The airfoil-shaped blades are obliquely fixed on the end plates of the two hollow blade groups.

Images