Heat exchange unit for kitchen oil fume waste heat recovery and kitchen oil fume waste heat recovery device

Abstract

The utility model provides a heat exchange unit for recovering waste heat of kitchen oil fume, which is surrounded by a heat exchange cavity for oil fume to flow through, and a heat exchange pipe is arranged in the heat exchange cavity. The heat exchange tube is a flat tube and is structurally thinner than a tube cavity of a circular heat exchange tube in the background technology, and oil smoke can transfer heat of the oil smoke to the central axis of the tube cavity from the tube wall to heat all parts of the tube cavity. When cold water flows in the heat exchange pipe, oil smoke can heat the cold water in all positions, close to the pipe wall, the center of the pipe cavity and the like, in the heat exchange pipe, and the heating effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen fume waste heat recovery, in particular to a heat exchange unit for kitchen fume waste heat recovery and a kitchen fume waste heat recovery device. Background Art

[0002] The kitchen fume waste heat recovery device recycles the waste heat from kitchen fume. Patent document CN217209501U discloses a kitchen fume waste heat recovery device, which includes a fume hood. The bottom of the fume hood is provided with an air intake window facing the stove. The air intake window is provided with a fume filter for filtering the fume. The top of the fume hood is provided with an exhaust pipe connected to the kitchen flue. The fume hood is provided with an exhaust fan located above and a heat exchange unit located below. The heat exchange unit includes an inlet pipe and an outlet pipe. A plurality of heat exchange tubes are arranged in parallel between the inlet pipe and the outlet pipe. The cross-section of the heat exchange tube cavity is circular. A fume gap is left between two adjacent heat exchange tubes for the flow of fume. Each heat exchange tube is connected to the inlet pipe and the outlet pipe. The inlet pipe is connected to a cold water tank, and the outlet pipe is connected to a hot water tank. When the device is powered on, cold water from the cold water tank flows through the water inlet pipe into the heat exchange tubes. Simultaneously, the exhaust fan rotates, drawing kitchen fumes through the air inlet window into the fume hood. After being filtered through the fume filter, the fumes flow through the gap between the two heat exchange tubes, transferring their own heat to the cold water in the heat exchange tubes before being blown out the exhaust pipe. The cold water in the heat exchange tubes absorbs the heat from the fumes and is heated to hot water, which then flows out of the outlet pipe to the hot water tank for use in the kitchen. The device's heat exchange unit uses circular heat exchange tubes, which have the disadvantage of being thick, making it difficult for the fumes to transfer their own heat to the central axis of the tube, resulting in poor heating of the cold water in the center of the tube. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a heat exchange unit for recovering waste heat from kitchen fume, wherein the heat exchange tube thereof is structurally such that the fume can easily transfer its own heat to the central axis of the tube cavity.

[0004] In order to solve the above technical problems, the utility model provides a heat exchange unit for recovering waste heat from kitchen fume, which is surrounded by a heat exchange cavity for the fume to flow through. Heat exchange tubes are provided in the heat exchange cavity, and the heat exchange tubes are flat tubes.

[0005] Furthermore, the inner cavity of the heat exchange tube provided by the present invention is divided into multiple heat exchange channels arranged vertically in parallel, and the ratio of the major axis to the minor axis of the cross section of the heat exchange channel is:.

[0006] Furthermore, a smoke inlet channel and a smoke outlet channel leading to the heat exchange chamber are provided, and both the smoke inlet channel and the smoke outlet channel are inclined, with the inclination directions being opposite.

[0007] Furthermore, the smoke inlet channel provided by the present invention is opened on the bottom wall of the heat exchange chamber provided by the present invention, and / or the smoke outlet channel provided by the present invention is opened on the top wall of the heat exchange chamber provided by the present invention.

[0008] Furthermore, it includes a water inlet pipe for connecting to a cold water output device and a water outlet pipe for connecting to a hot water recovery device, and the heat exchange pipe provided by the utility model is connected between the water inlet pipe and the water outlet pipe.

[0009] Furthermore, the cross section of the heat exchange tube lumen has a long axis of 15 mm to 200 mm and a short axis of 1.5 mm to 20 mm.

[0010] Furthermore, the utility model provides a plurality of heat exchange tubes arranged in parallel.

[0011] The utility model also provides a kitchen fume waste heat recovery device, including a fume hood, an air intake window facing the stove is provided at the bottom of the fume hood, a heat exchange unit is installed at the air intake window, an exhaust pipe connected to the kitchen flue is provided at the top of the fume hood, an exhaust fan for discharging the fume into the exhaust pipe is provided in the fume hood, the exhaust fan is located between the exhaust pipe and the heat exchange unit, and the heat exchange unit is the heat exchange unit provided by the utility model.

[0012] Furthermore, the heat exchange unit includes a water inlet pipe and a water outlet pipe. The heat exchange pipe provided by the utility model is connected between the water inlet pipe and the water outlet pipe. The water inlet pipe is connected to a cold water output device, and the water outlet pipe is connected to a hot water recovery device.

[0013] The heat exchange tubes in this utility model are flat tubes, which are thinner than the circular tubes of conventional heat exchange tubes. The oil smoke transfers its own heat from the tube walls to the central axis of the tube, heating the entire tube. When cold water flows through the heat exchange tubes, the oil smoke heats the cold water near the tube walls and at the center of the tube, achieving a good heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of a kitchen fume waste heat recovery device;

[0015] Figure 2 This is an explosion diagram of a kitchen fume waste heat recovery device;

[0016] Figure 3 Schematic diagram of a top view of a heat exchange unit;

[0017] Figure 4 This is a bottom-up schematic diagram of the heat exchange unit, with the upper and lower plates hidden in the figure;

[0018] Figure 5 is a schematic diagram of the heat exchange tube;

[0019] Figure 6This is a schematic diagram of the smoke inlet channel of the lower plate;

[0020] Figure 7 This is a schematic diagram of the smoke outlet channel on the upper plate.

[0021] Explanation of the accompanying reference numerals: 1. Smoke hood; 101. Air inlet window; 2. Exhaust pipe; 3. Exhaust fan; 4. Heat exchange unit; 5. Water inlet pipe; 6. Water outlet pipe; 7. Heat exchange pipe; 71. Heat exchange channel; 8. Lower plate; 9. Upper plate; 10. Smoke inlet channel; 11. Smoke outlet channel; 12. Connector; 13. Connecting pipe; 14. Cold water output device; 15. Hot water recovery device; 16. Left baffle pipe; 17. Right baffle pipe. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with specific embodiments.

[0023] See Figure 1 The kitchen fume waste heat recovery device includes a fume hood 1, an air intake window 101 facing the stove is opened at the bottom of the fume hood 1, and a heat exchange unit 4 is installed at the air intake window 101. Figure 2 An exhaust pipe 2 connected to the kitchen flue is provided on the top of the smoke hood 1, and an exhaust fan 3 is provided between the exhaust pipe 2 and the heat exchange unit 4 inside the smoke hood 1 to discharge the smoke into the exhaust pipe 2.

[0024] See Figure 2 、 3 The heat exchange unit 4 of the kitchen fume waste heat recovery device includes a water outlet pipe 6 at the front, a water inlet pipe 5 at the rear, a left baffle pipe 16, a right baffle pipe 17, an upper plate 9, and a lower plate 8. The water outlet pipe 6, the water inlet pipe 5, the left baffle pipe 16, the right baffle pipe 17, the upper plate 9, and the lower plate 8 together form a heat exchange chamber for the fume to flow through. Figure 2 The lower plate 8 is used as the bottom wall of the heat exchange chamber, and a smoke inlet channel 10 leading to the heat exchange chamber is provided. Figure 6 , the smoke inlet channel 10 is tilted to the left. Figure 3 The upper plate 9 is used as the top wall of the heat exchange chamber and is provided with a smoke outlet channel 11 leading to the heat exchange chamber. Figure 7 The smoke inlet channel 10 and the smoke outlet channel 11 are inclined to the right. The inclination directions of the smoke inlet channel 10 and the smoke outlet channel 11 are opposite, providing rotation conditions for the smoke, so that the smoke can rotate and flow in the heat exchange chamber to form a vortex. Figure 4 , a plurality of heat exchange tubes 7 are arranged in parallel in the heat exchange chamber, and each heat exchange tube 7 is connected between the water inlet pipe 5 and the water outlet pipe 6. Figure 5, is a flat tube with a long axis of 15mm to 200mm and a short axis of 1.5mm to 20mm in cross section. The diameter of the circular tube in the prior art is 20mm to 30mm. The short axis of the heat exchange tube 7 is smaller than the diameter of the circular heat exchange tube in the background art. The end of the short axis is closer to the midpoint of the short axis, that is, the central axis of the tube, which makes it easier for the heat of the oil smoke to be transferred from the tube wall to the central axis of the tube. The inner cavity of the heat exchange tube 7 is divided into multiple heat exchange channels 71 arranged vertically in parallel. The ratio of the long axis to the short axis of the cross section of the heat exchange channel 71 is 1:1. Its shape is regular and symmetrical, fewer vortices are generated, and the pressure distribution is more uniform, thereby reducing the resistance to the fluid.

[0025] See Figure 2 The kitchen fume waste heat recovery device includes a cold water output device 14 for outputting cold water and a hot water recovery device 15 for receiving hot water. Both the cold water output device 14 and the hot water recovery device 15 are connected to a connecting pipe 13. Both the water inlet pipe 5 and the water outlet pipe 6 are equipped with a joint 12. The water inlet pipe 5 is connected to the connecting pipe 13 via the joint 12, thereby connecting to the cold water output device 14. The water outlet pipe 6 is connected to the connecting pipe 13 via the joint 12, thereby connecting to the hot water recovery device 15.

[0026] The heat exchange unit 4 has the function of recovering the waste heat from cooking fumes and also has the function of separating oil. After the kitchen fume waste heat recovery device is powered on, the cold water output device 14 and the exhaust fan 3 are started at the same time. The working process is as follows:

[0027] The cold water output device 14 outputs cold water, which flows through the connecting pipe 13 and the water inlet pipe 5 and then flows into each heat exchange tube 7. The exhaust fan 3 draws kitchen fumes from the smoke inlet channel 10 into the heat exchange chamber of the heat exchange unit 4. The fumes transfer their own heat to the cold water in the heat exchange tube 7. After the cold water absorbs the heat and is heated into hot water, it flows through the water outlet pipe 6, the joint 12, and the connecting pipe 13 and then flows to the hot water recovery device 15 for use in the kitchen. In this way, the heat exchange unit 4 recovers the waste heat of the fumes. After transferring heat, the fumes cool down, and some small particles of fumes will gather and condense into large particles of fumes. Because the smoke inlet channel 10 and the smoke outlet channel 11 are inclined in opposite directions, they provide conditions for the fumes to rotate. The fumes can rotate and flow in the heat exchange chamber of the heat exchange unit 4 to form a vortex. In this way, the large particles of fumes are thrown onto the wall of the heat exchange chamber under the action of centrifugal force. In this way, the heat exchange unit 4 can separate and filter the fumes. The filtered oil smoke is discharged to the exhaust pipe 2 by the exhaust fan 3 and then discharged through the kitchen flue.

[0028] The above is only an embodiment of the present invention and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions based on the present invention and still fall within the scope of patent protection.

Claims

1. A heat exchange unit for recovering waste heat from kitchen fume, which is surrounded by a heat exchange cavity for the fume to flow through, and a heat exchange tube (7) is provided in the heat exchange cavity, wherein the heat exchange tube (7) is characterized in that: The heat exchange tube (7) is a flat tube; the inner cavity of the heat exchange tube (7) is divided to form a plurality of heat exchange channels (71) arranged vertically in parallel, and the ratio of the major axis to the minor axis of the cross section of the heat exchange channel (71) is 1:1; the major axis of the cross section of the heat exchange tube (7) is 15 mm to 200 mm, and the minor axis is 1.5 mm to 20 mm.

2. The heat exchange unit for recovering waste heat from cooking fumes according to claim 1 is characterized by: A smoke inlet channel (10) and a smoke outlet channel (11) leading to the heat exchange chamber are provided. The smoke inlet channel (10) and the smoke outlet channel (11) are both inclined, and the inclination directions of the two are opposite.

3. The heat exchange unit for recovering waste heat from cooking fumes according to claim 2, characterized in that: The smoke inlet channel (10) is opened on the bottom wall of the heat exchange chamber, and / or the smoke outlet channel (11) is opened on the top wall of the heat exchange chamber.

4. The heat exchange unit for recovering waste heat from cooking fumes according to claim 1, characterized in that: It comprises a water inlet pipe (5) for connecting to a cold water output device (14) and a water outlet pipe (6) for connecting to a hot water recovery device (15), wherein the heat exchange pipe (7) is connected between the water inlet pipe (5) and the water outlet pipe (6).

5. The heat exchange unit for recovering waste heat from kitchen fumes according to claim 1, characterized in that: There are multiple heat exchange tubes (7) arranged in parallel.

6. A kitchen fume waste heat recovery device, comprising a fume hood (1), an air intake window (101) facing the stove is provided at the bottom of the fume hood (1), a heat exchange unit (4) is installed at the air intake window (101), an exhaust pipe (2) connected to the kitchen flue is provided at the top of the fume hood (1), an exhaust fan (3) for exhausting fume to the exhaust pipe (2) is provided in the fume hood (1), and the exhaust fan (3) is located between the exhaust pipe (2) and the heat exchange unit (4), wherein the device is characterized in that: The heat exchange unit (4) is the heat exchange unit (4) according to any one of claims 1 to 5.

7. The kitchen fume waste heat recovery device according to claim 6, characterized in that: The heat exchange unit (4) comprises a water inlet pipe (5) and a water outlet pipe (6), wherein the heat exchange pipe (7) is connected between the water inlet pipe (5) and the water outlet pipe (6), the water inlet pipe (5) is connected to a cold water output device (14), and the water outlet pipe (6) is connected to a hot water recovery device (15).

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