Exhaust fume collecting hood waste heat recovery structure and fresh air system

Abstract

The utility model discloses an exhaust fume collecting hood waste heat recovery structure and a fresh air system, the exhaust fume collecting hood waste heat recovery structure is applied to an exhaust fume collecting hood, the side face, facing a cooking bench, of the exhaust fume collecting hood is provided with a heat collecting area, the heat collecting area is provided with a heat collecting cavity, and the heat collecting cavity is filled with heat exchange media. The heat pipe exchanger is provided with a heat exchange flow channel communicating with the heat collection cavity and used for heating air in the air channel, and the shell covers the outer side of the heat pipe exchanger and communicates with the air channel. The heat collecting area is arranged below the exhaust fume collecting hood, the heat collecting area absorbs smoke heat and heat radiation of cooking bench flames, and therefore heat exchange media are heated and evaporated, the heat exchange media release heat in the heat pipes in the shell area after being gasified, air in the air channel is heated, and the technical effects of increasing the indoor temperature and reducing energy consumption are achieved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas waste heat recovery technology, and in particular to a waste heat recovery structure for a smoke collection hood. Background Technology

[0002] Fume extraction equipment is a commonly used fume extraction device in prescriptions. It mainly includes a fume hood, a fan, and a ventilator. The fume hood is installed above the stove. The fan drives the ventilator to rotate, creating negative pressure in the fume hood, thereby expelling the gas in the space below the fume hood through the flue to the external environment.

[0003] If the heat from kitchen fumes is not recovered, a large amount of energy will be wasted. The fumes produced during cooking carry a considerable amount of heat energy. If this heat energy is not effectively utilized, it will be emitted outdoors along with the fumes, causing not only unnecessary loss of energy resources but also potentially increasing energy consumption, thereby exacerbating the energy shortage problem and posing a challenge to environmental sustainability. Utility Model Content

[0004] This application provides a waste heat recovery system for a fume hood, which addresses the technical problem of how to achieve waste heat recovery from flue gas.

[0005] The first aspect of this application provides a waste heat recovery structure for a fume hood, which is applied to a fume hood. The side of the fume hood facing the stove has a heat collection area, and the heat collection area has a heat collection cavity, which is filled with a heat exchange medium.

[0006] Includes: a heat pipe heat exchanger connected above the smoke hood, the heat pipe heat exchanger having a heat exchange channel communicating with the heat collection cavity, the heat pipe heat exchanger being used to heat the air in the air duct;

[0007] An outer casing is provided on the outside of the heat pipe heat exchanger, and the outer casing is connected to the air duct.

[0008] The beneficial effects of the above embodiments are as follows: by configuring a heat collection area below the smoke hood, the heat collection area absorbs the heat of the flue gas and the heat radiation of the stove flame, thereby heating and evaporating the heat exchange medium. After the heat exchange medium is vaporized, it releases heat in the outer shell area, heating the air in the air duct, thus producing the technical effect of increasing the indoor temperature and reducing energy consumption.

[0009] Based on the above embodiments, the embodiments of this application can be further improved as follows:

[0010] In one embodiment of this application: the heat pipe heat exchanger includes a plurality of heat pipes, and the outer periphery of the heat pipes has heat dissipation fins. The beneficial effect of this step is to improve heat exchange efficiency.

[0011] In one embodiment of this application, it further includes an auxiliary heating mechanism disposed at the heat collection area, the auxiliary heating mechanism being used to heat the heat exchange medium. The beneficial effect of this step is that when the flue gas and thermal radiation heat are insufficient to heat the heat exchange medium, the auxiliary mechanism heats the heat exchange medium, thereby ensuring the heating effect.

[0012] In one embodiment of this application, the system further includes a controller and a temperature sensor, the temperature sensor being disposed within the heat pipe and electrically connected to the controller and the auxiliary heating mechanism. The beneficial effect of this step is to achieve automatic temperature control.

[0013] In one embodiment of this application, the heat pipe heat exchanger comprises several groups. The beneficial effect of this step is that it facilitates improved heat exchange efficiency.

[0014] The second aspect of this application provides a fresh air system, including the aforementioned smoke hood waste heat recovery structure. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the first structure of the waste heat recovery structure of the smoke hood;

[0017] Figure 2 This is a schematic diagram of the second structure of the waste heat recovery structure of the smoke hood.

[0018] The components include: 1. Smoke hood; 101. Heat collection area; 2. Outer shell; 3. Heat pipe heat exchanger; 4. Air duct; and 5. Auxiliary heating mechanism. Detailed Implementation

[0019] In this application, unless otherwise expressly specified and limited, the terms used should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. If electrical or electronic equipment is involved, it can also refer to an electrical connection or a communication signal connection, etc. For those skilled in the art, the specific meaning of different terms in this utility model can be understood according to the specific circumstances, and the scope of the specific meaning should be limited to achieving the function of this application.

[0020] In the description of this application, it should be understood that the directional terms or positional relationships described are based on the orientation or positional relationships shown in the accompanying drawings, or based on the orientation or positional relationships in actual use, and are only for the purpose of facilitating the description of the contents of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Example 1

[0022] like Figure 1 , 2 As shown, a waste heat recovery structure for a fume hood is applied to a fume hood 1. The side of the fume hood 1 facing the stove has a heat collection area 101, and the heat collection area 101 has a heat collection cavity. The heat collection cavity is first evacuated and then filled with a heat exchange medium. It includes: an outer shell 2 and a heat pipe heat exchanger 3. The heat pipe heat exchanger 3 is connected to the top of the fume hood 1 and has a heat exchange flow channel communicating with the heat collection cavity. The heat pipe heat exchanger 3 is used to heat the air in the air duct 4. The outer shell 2 is covered outside the heat pipe heat exchanger 3 and is connected to the air duct 4.

[0023] Specifically, the heat pipe heat exchanger 3 includes several heat pipes arranged in parallel, and the heat pipes have heat dissipation fins on their outer periphery to improve heat exchange efficiency.

[0024] Specifically, such as Figure 1 As shown, the heat collection area 101 is a protruding structure on the inner surface of the smoke hood 1. If the heat collection area 101 is a stainless steel box-shaped structure, the heat collection area 101 is connected to the inner surface of the smoke hood 1, and the heat collection area 101 and the inner surface of the smoke hood 1 form a cavity. The cavity is filled with a heat exchange medium, such as water or ethylene glycol, which are commonly used in heat pipe products. The smoke hood 1 has a through hole corresponding to the cavity. The lower end of the heat pipe is inserted into the through hole and connected to the through hole. The internal space of the heat pipe is connected to the cavity to form a sealed structure. One end of the outer shell 2 is connected to the air duct 4 of the fresh air system, and the other end is connected to the upper surface of the smoke hood 1. The outer shell 2 covers the heat exchange pipe inside.

[0025] In use, the waste heat recovery structure of this type of fume hood 1 allows high-temperature flue gas to enter the fume hood 1 and directly exchange heat with the heat collection zone 101. Simultaneously, the heat from the open flame of the stove rises, generating thermal radiation that also heats the heat collection zone 101. The heat exchange medium vaporizes upon heating and enters the heat pipe. Because the temperature of the fresh air in the external air duct 4 is relatively low, the heat exchange medium releases heat to the outside. At the same time, the heat exchange medium liquefies and re-enters the heat collection zone 101, and this process repeats continuously. Therefore, the temperature of the fresh air in the air duct 4 can be increased. This waste heat recovery structure has the following advantages:

[0026] (1) High efficiency and energy saving: Reduces the heating load in winter;

[0027] (2) Environmental protection and emission reduction: Recovering waste heat reduces the use of fossil fuels and lowers CO2 emissions. At the same time, it reduces kitchen exhaust heat pollution.

[0028] Example 2

[0029] Based on Example 1, such as Figure 1 As shown, the waste heat recovery structure of the smoke hood 1 also includes an auxiliary heating mechanism 5, which is located in the heat collection zone 101 and is used to heat the heat exchange medium. When the heat from the flue gas and thermal radiation is insufficient to heat the heat exchange medium, the auxiliary mechanism heats the heat exchange medium to ensure the heating effect.

[0030] The auxiliary heating mechanism 5 uses an electric heating device or a hot water coil.

[0031] Specifically, when a hot water coil is used, the hot water coil is placed in the cavity. The hot water coil is connected to the hot water tank of the stove through pipes. The pipes are also connected to valves and water pumps. The valves control whether the hot water in the hot water tank flows to the hot water coil. The valves can be ball valves or solenoid valves.

[0032] Specifically, when an electric heating device is used, the electric heating device can be a heating rod or a heating wire. When a heating rod is used, the heating rod is directly inserted into the cavity. When a heating wire is used, the heating wire is wrapped around the heat collection area 101.

[0033] By configuring the auxiliary heating mechanism 5, when the heat radiation from the flue gas and open flame is insufficient, the auxiliary heating mechanism 5 provides additional heat as an extra heat source to supplement the heat dissipation pipe.

[0034] Example 3

[0035] Based on Embodiment 2, the waste heat recovery structure of the smoke hood 1 also includes: a controller and a temperature sensor. The temperature sensor is installed in the heat pipe and is electrically connected to the controller and the auxiliary heating mechanism 5.

[0036] Specifically, the controller can be a PLC controller, a single-chip microcomputer or a microprocessor, etc. The temperature sensor is a thermocouple. After drilling a hole on the surface of the heat pipe, the detection end of the thermocouple is inserted into the heat pipe to monitor the internal temperature of the heat pipe. At this time, the valve needs to be a solenoid valve to realize the automatic temperature control function.

[0037] When the temperature is lower than the set temperature, the PLC controller controls the auxiliary heating mechanism 5 to work. When the temperature is lower than the set temperature, the PLC controller controls the auxiliary heating mechanism 5 to stop working, thereby realizing the automatic temperature control function.

[0038] Example 4

[0039] Based on Examples 1, 2, 3, or 4, such as Figure 2As shown, there are several groups of heat pipe heat exchangers 3, and each group of heat pipe heat exchangers 3 has multiple heat pipes arranged in parallel.

[0040] When the stove is long, multiple heat pipes are installed to fully absorb the heat from the flue gas and open flame, thereby improving the utilization rate of waste heat.

[0041] Example 5

[0042] A fresh air system includes the waste heat recovery structure of the smoke hood 1 disclosed in Embodiments 1, 2, 3, 4 or 5.

[0043] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A waste heat recovery structure for a smoke hood, characterized in that, It is applied to a smoke hood, wherein the side of the smoke hood facing the stove has a heat collection area, the heat collection area has a heat collection cavity, and the heat collection cavity is filled with a heat exchange medium; Includes: a heat pipe heat exchanger connected above the smoke hood, the heat pipe heat exchanger having a heat exchange channel communicating with the heat collection cavity, the heat pipe heat exchanger being used to heat the air in the air duct; An outer casing is provided on the outside of the heat pipe heat exchanger, and the outer casing is connected to the air duct.

2. The waste heat recovery structure of the smoke hood according to claim 1, characterized in that, The heat pipe heat exchanger includes several heat pipes, and the outer periphery of the heat pipes has heat dissipation fins.

3. The waste heat recovery structure of the smoke collection hood according to claim 1, characterized in that, Also includes: An auxiliary heating mechanism is provided at the heat collection area and is used to heat the heat exchange medium.

4. The waste heat recovery structure of the smoke hood according to claim 3, characterized in that, Also includes: The controller and temperature sensor are provided. The temperature sensor is disposed in the heat pipe and is electrically connected to the controller and the auxiliary heating mechanism.

5. The waste heat recovery structure of the smoke hood according to claim 1, characterized in that, The heat pipe heat exchangers are in several groups.

6. A fresh air system, characterized in that, Includes the waste heat recovery structure of the smoke hood as described in any one of claims 1-5.

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