Range hood and control method thereof

Abstract

According to the range hood and the control method thereof, a three-way valve is installed on a refrigerant pipeline between a compressor and an indoor unit module, the inlet end of the three-way valve communicates with the indoor unit module, the first outlet end of the three-way valve communicates with the inlet end of the compressor, and the second outlet end of the three-way valve communicates with the inlet end of a heat exchange pipe; the outlet end of the heat exchange pipe communicates with the inlet end of the compressor, and the heat exchange pipe is installed on the outer wall face of the heat dissipation channel. When the range hood dissipates heat of the sheet metal wall of the heat dissipation channel, only the three-way valve needs to be guided to the heat exchange pipe, and a refrigerant flows through the heat exchange pipe and exchanges heat with the sheet metal wall, so that the temperature of the sheet metal wall is reduced, and additional parts do not need to be added. On one hand, cooling of the metal plate wall of the heat dissipation channel is achieved through the cooling capacity of the refrigerant, the utilization rate is improved, more energy is saved, the environment is better protected, and on the other hand, the condensation phenomenon on the metal plate wall of the heat dissipation channel is avoided.

Description

Technical Field

[0001] The invention relates to a range hood, and in particular to a range hood and a control method thereof. Background Art

[0002] Various refrigeration range hoods are disclosed in the prior art. Air conditioning components are added to the range hood platform. The compressor, condenser and evaporator are connected through refrigerant pipelines. The refrigeration range hood can realize all the functions of the range hood and the function of the air conditioner. The condenser heat dissipation method of the refrigeration range hood on the market is often discharged into the public flue through the common flue with the range hood. The wind temperature of the condenser heat dissipation is often as high as 70°C or above. When entering the range hood and merging inside, it will heat the sheet metal surface of the range hood. If the heat dissipation channel is not insulated, according to actual measurements, the maximum temperature of the sheet metal surface can reach 65°C. As a result, people may be burned if they touch it accidentally, and the temperature of the sheet metal wall is too high, which will damage the contact objects such as the wall and wooden board where the range hood is installed for a long time, affecting reliability. Therefore, the current method of heat dissipation through the oil fume channel requires sponge to be pasted inside the heat dissipation channel for temperature insulation, which increases the difficulty of assembly, and there is a risk of sponge shedding and odor over time. If the heat dissipation air is directly discharged to the outside, the installation difficulty and cost will increase. In addition, in a normal refrigeration system, the refrigerant is compressed by the compressor and then enters the condenser for heat dissipation, then enters the throttling device, and after throttling, enters the evaporator, where it vaporizes and absorbs heat for heat exchange, and then enters the compressor through the intake pipe to complete the system cycle. In existing refrigeration range hoods, a large part of the cold capacity of the refrigerant after heat exchange in the evaporator is still not fully utilized, and the utilization rate is low. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a range hood that can use the system's own capabilities to reduce the temperature of the outer wall of the heat dissipation channel without adding additional components in response to the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide a control method for a range hood that can cool the outer wall of the heat dissipation channel and avoid condensation after cooling, in response to the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: the range hood comprises a fan frame and an air inlet body arranged at the bottom of the fan frame, a fume extractor fan is installed in the fan frame, a compressor, a heat dissipation module and an indoor module are installed outside the fan frame, the compressor, the heat dissipation module and the indoor module are connected through a refrigerant pipeline, a vent is opened on the fan frame, an oil fume channel and a heat dissipation channel are formed inside the fan frame, the heat of the heat dissipation module enters the heat dissipation channel through the vent, and is characterized in that: a three-way valve is installed on the refrigerant pipeline between the compressor and the indoor module, the inlet end of the three-way valve is connected to the indoor module, the first outlet end of the three-way valve is connected to the inlet end of the compressor, the second outlet end of the three-way valve is connected to the inlet end of a heat exchange pipe, the outlet end of the heat exchange pipe is connected to the inlet end of the compressor, and the heat exchange pipe is installed on the outer wall surface of the heat dissipation channel.

[0006] Preferably, a first temperature sensor is installed on the outer wall surface of the heat dissipation channel, and a controller is also included, the controller can receive the output signal of the first temperature sensor, and control the switching of the three-way valve and the heat dissipation of the heat dissipation module according to the received signal. In this way, when the temperature value detected by the first temperature sensor is high, the three-way valve switches to the heat exchange tube, and the heat exchange tube exchanges heat with the outer wall surface of the heat dissipation channel to reduce the temperature of the outer wall surface, and the heat exchange effect can be improved by increasing the heat dissipation of the heat dissipation module.

[0007] It is further preferred that a second temperature sensor is installed at the return air outlet of the indoor module, and a third temperature sensor is installed on the exhaust pipe of the compressor. The controller can receive the output signals of the second temperature sensor and the third temperature sensor, and control the switching of the three-way valve and the heat dissipation of the heat dissipation module according to the received signals. In this way, by obtaining the temperature values ​​of the three temperature sensors, the switching of the three-way valve and the heat dissipation of the heat dissipation module are controlled. On the one hand, the coldness of the refrigerant is fully utilized to achieve the cooling of the sheet metal wall of the heat dissipation channel, improve the utilization rate, and be more energy-saving and environmentally friendly. On the other hand, condensation on the sheet metal wall of the heat dissipation channel can be avoided.

[0008] As a preferred solution, the controller adjusts the heat dissipation of the heat dissipation module by controlling the air volume of the range fumes suction fan.

[0009] As another preferred solution, the heat dissipation module includes a heat dissipation fan installed outside the fan rack, and the controller adjusts the heat dissipation of the heat dissipation module by controlling the air volume of the heat dissipation fan.

[0010] Further preferably, the heat dissipation module includes a condenser, the indoor unit module includes an evaporator and an air outlet fan, the compressor, condenser and evaporator are connected through the refrigerant pipeline, the three-way valve is installed on the refrigerant pipeline between the evaporator and the compressor, and the third temperature sensor is installed on the refrigerant pipeline between the compressor and the condenser.

[0011] In order to improve the heat dissipation effect of the sheet metal wall of the heat dissipation channel, the fume suction fan is a centrifugal fan having a front air inlet and a rear air inlet, the air inlet body having a smoke inlet, the smoke inlet being connected to the front air inlet through the fume channel, the ventilation port being connected to the rear air inlet, and the heat exchange tube being attached to the rear wall of the fan frame.

[0012] In order to prevent the oil smoke and the heat dissipation air from interfering with each other, a partition is provided inside the air inlet body, and the oil smoke channel is separated from the heat dissipation channel by the partition.

[0013] The compressor and the heat dissipation module can be installed in a plurality of different positions, the compressor and the heat dissipation module are arranged on the left side of the fan rack, and the vent is opened on the left side wall of the fan rack, or the compressor and the heat dissipation module are arranged on the right side of the fan rack, and the vent is opened on the right side wall of the fan rack. Such an arrangement facilitates the heat of the compressor and the heat dissipation module to enter the heat dissipation channel through the vent.

[0014] The technical solution adopted by the present invention to solve the second technical problem is: the control method of the range hood comprises the following steps:

[0015] S1, the range hood turns on the cooling mode;

[0016] S2, determining whether the temperature value T1 detected by the first temperature sensor is greater than or equal to a preset value;

[0017] If it is greater than or equal to the preset value, the three-way valve guides the heat exchange tube, the temperature value T1 decreases, the temperature value T3 detected by the third temperature sensor increases, and then enters step S3;

[0018] If it is less than the preset value, the three-way valve will direct the compressor and the system will operate normally;

[0019] S3, judging whether T3≥Δt1 is established, where Δt1 is the upper limit value of the exhaust pipe temperature;

[0020] If yes, increase the cooling air volume and return to step S3 to continue the judgment;

[0021] If not, proceed to step S4;

[0022] S4, judging whether T3≤Δt2 is established, Δt2 is the lower limit of the exhaust pipe temperature;

[0023] If yes, reduce the cooling air volume and return to step S3 to continue the judgment;

[0024] If not, proceed to step S5;

[0025] S5, judging whether T1≥T2 is established, where T2 is the temperature value detected by the second temperature sensor;

[0026] If yes, the system is running normally;

[0027] If not, the three-way valve directs to the compressor and returns to step S2.

[0028] Compared with the prior art, the advantages of the present invention are: the range hood is equipped with a three-way valve on the refrigerant pipeline between the compressor and the indoor unit module. When the sheet metal wall of the heat dissipation channel is cooled, it is only necessary to guide the three-way valve to the heat exchange tube, so that the refrigerant flows through the heat exchange tube and exchanges heat with the sheet metal wall, thereby reducing the temperature of the sheet metal wall and avoiding various safety hazards without adding additional components. The control method of the range hood obtains the temperature values ​​of three temperature sensors to control the switching of the three-way valve and the heat dissipation of the heat dissipation module. On the one hand, the coldness of the refrigerant is fully utilized to achieve cooling of the sheet metal wall of the heat dissipation channel, thereby improving the utilization rate and being more energy-saving and environmentally friendly. On the other hand, condensation on the sheet metal wall of the heat dissipation channel can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a range hood according to an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the internal structure of a range hood according to an embodiment of the present invention;

[0031] Figure 3 A structural cross-sectional view of a range hood according to an embodiment of the present invention;

[0032] Figure 4 A connection diagram of an air conditioning assembly according to an embodiment of the present invention;

[0033] Figure 5 This is a logic control diagram of the control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 4As shown, the range hood of this embodiment includes a fan frame 1 and an air inlet body 2 arranged at the bottom of the fan frame 1, a fume extractor fan 3 is installed in the fan frame 1, a vent 11 is opened on the fan frame 1, and an oil fume channel 12 and a heat dissipation channel 13 are formed inside the fan frame 1. The fume extractor fan 3 is a double-inlet centrifugal fan, having a front air inlet 31 and a rear air inlet 32, the air inlet body 2 has a smoke inlet 21, the smoke inlet 21 is connected to the front air inlet 31 through the oil fume channel 12, the vent 11 is connected to the rear air inlet 32, and a partition 22 is provided inside the air inlet body 2, the oil fume channel 12 is separated from the heat dissipation channel 13 by the partition 22, so as to avoid the oil in the oil fume channel 12 and the heat dissipation airflow in the heat dissipation channel 13 from interfering with each other.

[0036] The compressor 4, the heat dissipation module 5 and the indoor module 6 are installed outside the fan frame 1, and the compressor 4, the heat dissipation module 5 and the indoor module 6 are connected through the refrigerant pipeline 7. In this embodiment, the indoor module 6 is installed on the top of the fan frame 1, the compressor 4 and the heat dissipation module 5 are arranged on the right side of the fan frame 1, and the vent 11 is opened on the right side wall of the fan frame 1, so that the heat of the compressor 4 and the heat dissipation module 5 can quickly enter the heat dissipation channel 13 through the vent 11.

[0037] The heat dissipation module 5 includes a condenser 51, the indoor module 6 includes an evaporator 61 and an air outlet fan 62, the compressor 4, the condenser 51 and the evaporator 61 are connected through a refrigerant pipeline 7, the refrigerant pipeline 7 between the compressor 4 and the condenser 51 constitutes an exhaust pipe, and the refrigerant pipeline between the compressor 4 and the evaporator 61 constitutes an intake pipe. A three-way valve 8 is installed on the intake pipe, the inlet end of the three-way valve 8 is connected to the outlet end of the evaporator 61, the first outlet end of the three-way valve 8 is connected to the inlet end of the compressor 4, the second outlet end of the three-way valve 8 is connected to the inlet end of the heat exchange tube 9, and the outlet end of the heat exchange tube 9 is connected to the inlet end of the compressor 4. The heat exchange tube 9 is installed on the outer wall of the heat dissipation channel 13, that is, the rear wall of the fan frame 1. The outer wall of the heat dissipation channel 13 is a sheet metal wall. In this embodiment, the heat exchange tube 9 adopts a coil, which is evenly distributed and attached to the sheet metal wall of the heat dissipation channel 13, so that the heat exchange tube 9 can fully exchange heat with the outer wall of the heat dissipation channel 13, thereby improving the heat exchange effect. Since the temperature of the sheet metal wall of the heat dissipation channel 13 is as high as 60°C, and the temperature of the refrigerant flowing out of the evaporator is less than 30°C, the refrigerant can exchange heat with the sheet metal wall, thereby reducing the temperature of the sheet metal wall.

[0038] In this embodiment, a first temperature sensor 101 is installed on the outer wall surface of the heat dissipation channel 13, a second temperature sensor 102 is installed on the return air outlet of the indoor module 6, and a third temperature sensor 103 is installed on the exhaust pipe. The first temperature sensor 101, the second temperature sensor 102 and the third temperature sensor 103 are all connected to the controller (not shown) by electrical signals. The controller can receive the output signals of the first temperature sensor 101, the second temperature sensor 102 and the third temperature sensor 103, and control the switching of the three-way valve 8 and the heat dissipation of the heat dissipation module 5 according to the received signals. In this embodiment, the heat dissipation of the heat dissipation module 5 is adjusted by controlling the air volume of the range fumes exhaust fan 3. In the case of independently installing the heat dissipation fan, the heat dissipation of the heat dissipation module can be adjusted by controlling the air volume of the heat dissipation fan, thereby adjusting the sheet metal wall temperature of the heat dissipation channel 13.

[0039] like Figure 5 As shown, the control method of the range hood includes the following steps:

[0040] S1, the range hood turns on the cooling mode;

[0041] S2, determining whether the temperature value T1 detected by the first temperature sensor 101 is greater than or equal to a preset value;

[0042] If it is greater than or equal to the preset value, the three-way valve 8 guides the heat exchange tube 9, the temperature value T1 decreases, the temperature value T3 detected by the third temperature sensor 103 increases, and then the process goes to step S3;

[0043] If it is less than the preset value, the three-way valve 8 directs to the compressor 4 and the system operates normally;

[0044] S3, judging whether T3≥Δt1 is established, where Δt1 is the upper limit value of the exhaust pipe temperature;

[0045] If yes, increase the cooling air volume and return to step S3 to continue the judgment;

[0046] If not, proceed to step S4;

[0047] S4, judging whether T3≤Δt2 is established, Δt2 is the lower limit of the exhaust pipe temperature;

[0048] If yes, reduce the cooling air volume and return to step S3 to continue the judgment;

[0049] If not, proceed to step S5;

[0050] S5, judging whether T1≥T2 is established, where T2 is the temperature value detected by the second temperature sensor 102, i.e., the indoor environment temperature;

[0051] If yes, the system is running normally;

[0052] If not, the three-way valve 8 directs the compressor 4 and returns to step S2.

[0053] In the above step S2, the preset value is generally 45°C.

[0054] It can be known from the above control method that if the sheet metal wall temperature of the heat dissipation channel 13 is lower than the indoor ambient temperature, condensation water will be generated on the sheet metal wall. The third temperature sensor 103 on the exhaust pipe is used to detect the temperature T3 of the exhaust pipe. The upper temperature limit of the exhaust pipe is required to be Δt1. Once the system exceeds Δt1, the entire system will shut down for protection. The lower temperature limit of the exhaust pipe to maintain the cooling capacity of the entire system is required to be Δt2. Since the refrigerant that originally flows directly from the evaporator 61 into the suction pipe of the compressor 4 changes the flow direction after the three-way valve 8 is reversed, the temperature of the suction pipe after the refrigerant flows into the heat exchange pipe 9 is higher than the temperature before the refrigerant flows into the heat exchange pipe 9. Therefore, it is necessary to increase the heat dissipation air volume Q of the heat dissipation module so as to reduce the exhaust pipe temperature T3. In order to ensure the cooling capacity of the whole machine, when the temperature T3 is lower than Δt2, it is necessary to reduce the heat dissipation air volume Q to increase the exhaust pipe temperature T3. Therefore, this control method can utilize the system's own capabilities, fully utilize the coldness of the refrigerant, effectively cool the sheet metal wall, improve utilization, and avoid various safety hazards. At the same time, through the control logic and adjustment of the three-way valve, condensation on the sheet metal wall can be avoided.

Claims

1. A range hood, comprising a fan frame (1) and an air inlet body (2) arranged at the bottom of the fan frame (1), a range hood fan (3) being installed in the fan frame (1), a compressor (4), a heat dissipation module (5) and an internal module (6) being installed outside the fan frame (1), the compressor (4), the heat dissipation module (5) and the internal module (6) being connected via a refrigerant pipeline (7), a vent (11) being provided on the fan frame (1), a range hood passage (12) and a heat dissipation passage (13) being formed inside the fan frame (1), the heat of the heat dissipation module (5) entering into the heat dissipation passage (13) through the vent (11), and characterized in that: A three-way valve (8) is installed on the refrigerant pipeline (7) between the compressor (4) and the indoor module (6); the inlet end of the three-way valve (8) is connected to the indoor module (6); the first outlet end of the three-way valve (8) is connected to the inlet end of the compressor (4); the second outlet end of the three-way valve (8) is connected to the inlet end of the heat exchange tube (9); the outlet end of the heat exchange tube (9) is connected to the inlet end of the compressor (4); and the heat exchange tube (9) is installed on the outer wall surface of the heat dissipation channel (13).

2. The range hood according to claim 1, characterized in that: A first temperature sensor (101) is installed on the outer wall surface of the heat dissipation channel (13), and a controller is also included. The controller can receive an output signal of the first temperature sensor (101) and control the switching of the three-way valve (8) and the heat dissipation of the heat dissipation module (5) according to the received signal.

3. The range hood according to claim 2, characterized in that: A second temperature sensor (102) is installed at the return air outlet of the indoor unit module (6), and a third temperature sensor (103) is installed on the exhaust pipe of the compressor (4). The controller can receive output signals of the second temperature sensor (102) and the third temperature sensor (103), and control the switching of the three-way valve (8) and the heat dissipation of the heat dissipation module (5) according to the received signals.

4. The range hood according to claim 2 or 3, characterized in that: The controller adjusts the heat dissipation of the heat dissipation module (5) by controlling the air volume of the range fumes suction fan (3).

5. The range hood according to claim 2 or 3, characterized in that: The heat dissipation module (5) comprises a heat dissipation fan installed outside the fan frame (1), and the controller adjusts the heat dissipation of the heat dissipation module (5) by controlling the air volume of the heat dissipation fan.

6. The range hood according to claim 3, characterized in that: The heat dissipation module (5) includes a condenser (51), the indoor unit module (6) includes an evaporator (61) and an air outlet fan (62), the compressor (4), the condenser (51) and the evaporator (61) are connected via the refrigerant pipeline (7), the three-way valve (8) is installed on the refrigerant pipeline (7) between the evaporator (61) and the compressor (4), and the third temperature sensor (103) is installed on the refrigerant pipeline (7) between the compressor (4) and the condenser (51).

7. The range hood according to claim 1, characterized in that: The oil fume exhaust fan (3) is a centrifugal fan having a front air inlet (31) and a rear air inlet (32); the air inlet body (2) has a smoke inlet (21); the smoke inlet (21) is connected to the front air inlet (31) through the oil fume channel (12); the ventilation port (11) is connected to the rear air inlet (32); and the heat exchange pipe (9) is attached to the rear wall of the fan frame (1).

8. The range hood according to claim 6, characterized in that: A partition plate (22) is provided inside the air inlet body (2), and the oil smoke channel (12) is separated from the heat dissipation channel (13) by the partition plate (22).

9. The range hood according to claim 1, characterized in that: The compressor (4) and the heat dissipation module (5) are arranged on the left side of the fan rack (1), and the ventilation opening (11) is opened on the left side wall of the fan rack (1); or, the compressor (4) and the heat dissipation module (5) are arranged on the right side of the fan rack (1), and the ventilation opening (11) is opened on the right side wall of the fan rack (1).

10. A control method for a range hood, characterized in that: The control method is applied to the range hood according to claim 3, and the control method comprises the following steps: S1, the range hood turns on the cooling mode; S2, determining whether the temperature value T1 detected by the first temperature sensor (101) is greater than or equal to a preset value; If it is greater than or equal to the preset value, the three-way valve (8) guides the heat exchange tube (9), the temperature value T1 decreases, the temperature value T3 detected by the third temperature sensor (103) increases, and then the process proceeds to step S3; If it is less than the preset value, the three-way valve (8) directs the compressor (4) and the system operates normally; S3, judging whether T3≥Δt1 is established, where Δt1 is the upper limit value of the exhaust pipe temperature; If yes, increase the cooling air volume and return to step S3 to continue the judgment; If not, proceed to step S4; S4, judging whether T3≤Δt2 is established, Δt2 is the lower limit of the exhaust pipe temperature; If yes, reduce the cooling air volume and return to step S3 to continue the judgment; If not, proceed to step S5; S5, judging whether T1≥T2 holds, where T2 is the temperature value detected by the second temperature sensor (102); If yes, the system is running normally; If not, the three-way valve (8) directs the compressor (4) and returns to step S2.

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