A refrigerated range hood system and its control method

Abstract

A refrigerated range hood system and its control method are disclosed, comprising a fume extraction module, a compressor, a heat dissipation module, and an indoor unit module. The fume extraction module includes a fume extraction fan; the heat dissipation module includes a condenser and a heat dissipation fan, the heat dissipation fan having fan blades and a heat dissipation motor driving the fan blades; the indoor unit module includes an evaporator and an indoor unit fan; the heat dissipation module has a heat dissipation cavity and a motor mounting cavity that are isolated from each other, the condenser and fan blades are mounted in the heat dissipation cavity, and the heat dissipation motor is mounted in the motor mounting cavity. The advantages of this invention are: the refrigerated range hood system places the heat dissipation motor in an independent cavity outside the heat dissipation module, ensuring that the heat dissipation motor does not degrade in performance during operation; and the control method controls the switching of the three-way valve on the refrigerant pipeline based on the temperature detected by various temperature sensors, ensuring the overall cooling capacity and refrigeration stability of the system, and preventing condensation from forming on the surface of the motor mounting cavity due to excessively low temperatures.

Description

Technical Field

[0001] This invention relates to a range hood, and more particularly to a refrigerated range hood system and its control method. Background Technology

[0002] Various refrigerated range hoods are disclosed in the prior art, which add an air conditioning component to the range hood platform. These refrigerated range hoods can perform both all the functions of a range hood and the function of an air conditioner. For example... Figure 2 As shown, the refrigerated range hood system includes a fume extraction module, a compressor, a heat dissipation module, and an indoor unit module. The heat dissipation module and indoor unit module are located outside the fume extraction fan. The heat dissipation module includes a condenser and a heat dissipation fan, with fan blades and a heat dissipation motor driving the blades. The indoor unit module includes an evaporator and an indoor unit fan. The compressor, condenser, and evaporator are connected via refrigerant piping, and a throttling device is installed on the refrigerant piping between the condenser and evaporator. To reduce the impact of fume extraction capacity, existing refrigerated range hoods often use low fan speeds to dissipate heat from the condenser. At low fan speeds, the condenser temperature can often reach over 60°C. The air dissipating heat from the condenser passes through the heat dissipation motor, heating it and affecting its performance. This reduces the airflow for heat dissipation, resulting in insufficient airflow for the entire refrigeration system, thus reducing the overall cooling capacity and stability of the unit. To address the performance impact of overheating in the cooling motor, it's common practice to place the motor outside the cooling module housing. However, heat from the cooling module will still be transferred to the motor via the motor shaft, causing it to overheat after prolonged operation and reducing performance. Alternatively, the control board for the cooling motor can be placed outside the cooling module, but the heat from the module can affect the motor's internal magnetic poles, leading to excessively high temperatures or even demagnetization, thus impacting motor performance. Therefore, further improvements are needed to the existing refrigeration range hood system. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide a cooling range hood system that avoids the adverse effects of temperature rise of the fan-cooled motor for condenser heat dissipation, in light of the above-mentioned existing technology.

[0004] The second technical problem to be solved by the present invention is to provide a control method for a refrigeration range hood system that can ensure that the performance of the cooling motor does not decrease during operation and that the cooling capacity and refrigeration stability of the system are guaranteed, in view of the above-mentioned existing technology.

[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: The refrigeration range hood system includes a range hood module, a compressor, a heat dissipation module, and an indoor unit module. The range hood module includes a range hood fan. The heat dissipation module and the indoor unit module are located outside the range hood fan. The heat dissipation module includes a condenser and a heat dissipation fan. The heat dissipation fan has fan blades and a heat dissipation motor that drives the fan blades to rotate. The indoor unit module includes an evaporator and an indoor unit fan. The compressor, condenser, and evaporator are connected through a refrigerant pipeline. A throttling device is installed on the refrigerant pipeline between the condenser and the evaporator. The feature is that the heat dissipation module has a heat dissipation cavity and a motor mounting cavity that are isolated from each other. The condenser and fan blades are installed in the heat dissipation cavity, and the heat dissipation motor is installed in the motor mounting cavity.

[0006] The refrigeration range hood system also includes a first three-way valve and a second three-way valve. The inlet of the first three-way valve is connected to the outlet of the throttling device, the first outlet of the first three-way valve is connected to the evaporator, the second outlet of the first three-way valve is connected to the inlet of the second three-way valve, the first outlet of the second three-way valve is connected to the inlet of the compressor, and the second outlet of the second three-way valve is connected to the first outlet of the first three-way valve. The refrigerant pipeline between the second outlet of the first three-way valve and the inlet of the second three-way valve can exchange heat with the heat dissipation motor in the motor mounting cavity.

[0007] In order to enable the refrigerant to exchange heat with the heat dissipation motor, the refrigerant pipeline between the second outlet of the first three-way valve and the inlet of the second three-way valve has a refrigerant pipeline heat exchange section arranged on the outer wall of the motor mounting cavity.

[0008] In order to make the heat exchange between the refrigerant and the heat dissipation motor more efficient, the heat exchange section of the refrigerant pipeline is attached to and coiled on the outer wall of the motor mounting cavity.

[0009] To enhance the system's intelligence, the refrigeration range hood system also includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, and a controller. The first temperature sensor detects the internal temperature of the motor mounting cavity, the second temperature sensor detects the external ambient temperature of the range hood, the third temperature sensor detects the pipe temperature at the outlet of the refrigerant heat exchange section, and the fourth temperature sensor detects the pipe temperature at the outlet of the evaporator. The controller receives the output signals from the first, second, third, and fourth temperature sensors and controls the operating status of the first and second three-way valves accordingly based on the received signals.

[0010] In order for the first temperature sensor to detect the temperature of the cooling motor, the first temperature sensor is installed inside the motor mounting cavity.

[0011] In order for the second temperature sensor to detect the indoor ambient temperature, the indoor unit module has an indoor unit return air vent, and the second temperature sensor is installed at the indoor unit return air vent of the indoor unit module.

[0012] In order for the third temperature sensor to detect the temperature of the heat exchange section of the refrigerant pipeline after heat exchange, and for the fourth temperature sensor to detect the temperature of the evaporator outlet section, the third temperature sensor is installed on the refrigerant pipeline between the outlet of the heat exchange section of the refrigerant pipeline and the inlet of the second three-way valve, and the fourth temperature sensor is installed on the refrigerant pipeline between the evaporator outlet and the compressor inlet.

[0013] In order to allow the hot air blown out by the cooling fan to enter the interior of the fume extraction fan, the air outlet of the cooling fan and the air inlet of the fume extraction fan are in fluid communication.

[0014] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for the refrigeration range hood system, comprising the following steps:

[0015] S1. The range hood is set to cooling mode.

[0016] S2. Determine whether the temperature T1 detected by the first temperature sensor satisfies T1≥ΔT℃, where ΔT is the maximum ambient temperature that the cooling motor can withstand.

[0017] If so, proceed to step S3;

[0018] If not, then close the second outlet of the first three-way valve, and the refrigeration system will operate normally;

[0019] S3. Adjust the first three-way valve. The opening of the first outlet of the first three-way valve decreases, the opening of the second outlet increases, and the temperature T1 decreases. Then proceed to step S4.

[0020] S4. Determine whether T1≥ΔT℃ is satisfied.

[0021] If so, return to step S3;

[0022] If not, proceed to step S5;

[0023] S5. Determine whether the temperature T1 detected by the first temperature sensor satisfies T1≥t℃, where t is the ambient temperature detected by the second temperature sensor.

[0024] If so, proceed to step S6;

[0025] If not, adjust the first three-way valve, increase the opening of the first outlet of the first three-way valve, decrease the opening of the second outlet of the second three-way valve, and then return to step S2;

[0026] S6. Determine whether the temperature T3 detected by the third temperature sensor satisfies T3≥T4℃, where T4 is the temperature at the outlet of the evaporator detected by the fourth temperature sensor.

[0027] If so, the first outlet of the second three-way valve will open, the second outlet will close, and the system will operate normally.

[0028] If not, the first outlet of the second three-way valve will be closed and the second outlet will be open, and the system will operate normally.

[0029] Compared with the prior art, the advantages of the present invention are as follows: The refrigeration range hood system includes a range hood module, a compressor, a heat dissipation module, and an indoor unit module. The heat dissipation module has a heat dissipation cavity and a motor mounting cavity that are isolated from each other. The condenser and the fan blades are installed in the heat dissipation cavity, and the heat dissipation motor of the fan blades is installed in the motor mounting cavity. That is, the heat dissipation motor is arranged in an independent cavity outside the heat dissipation module, which can ensure that the performance of the heat dissipation motor does not decrease during operation. In addition, the control method can control the switching of the three-way valve on the refrigerant pipeline according to the temperature detected by each temperature sensor, which can ensure the overall cooling capacity and refrigeration stability of the system, and also prevent condensation from forming on the surface of the motor mounting cavity due to excessively low temperature. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a refrigerated range hood according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of an existing refrigeration range hood system.

[0032] Figure 3 This is a schematic diagram of the refrigeration range hood system according to an embodiment of the present invention;

[0033] Figure 4 This is a flowchart of the control method for a refrigerated range hood system according to an embodiment of the present invention. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] like Figure 1 and Figure 3 As shown, the refrigeration range hood system of this embodiment includes a fume extraction module 1, a compressor 2, a heat dissipation module 3, and an indoor unit module 4. The fume extraction module 1 includes a fume extraction fan 11. The heat dissipation module 3 and the indoor unit module 4 are located outside the fume extraction fan 11. The heat dissipation module 3 includes a condenser 31 and a heat dissipation fan 32. The indoor unit module 4 includes an evaporator 41 and an indoor unit fan 42. The compressor 2, the condenser 31, and the evaporator 41 are connected through a refrigerant pipeline 5. A throttling device 6 is installed on the refrigerant pipeline 5 between the condenser 31 and the evaporator 41.

[0036] The heat dissipation module 3 has a heat dissipation cavity 33 and a motor mounting cavity 34 that are isolated from each other. The condenser 31 and the fan blades 321 are installed in the heat dissipation cavity 33. The cooling fan 32 has fan blades 321 and a cooling motor 322 that drives the fan blades 321 to rotate. The cooling motor 322 is installed in the motor mounting cavity 34. The air outlet of the cooling fan 32 can be directly connected to the outside of the range hood, or it can be fluidly connected to the inside of the volute of the range hood 11 through the air inlet on the volute ring wall, or it can be fluidly connected to the air inlet of the range hood 11 through the air inlet on the fan frame.

[0037] In this embodiment, the refrigeration range hood system has a first three-way valve 71 and a second three-way valve 72 installed on the refrigerant pipeline 5. The inlet of the first three-way valve 71 is connected to the outlet of the throttling device 6; the first outlet (A-port) of the first three-way valve 71 is connected to the evaporator 41; the second outlet (B-port) of the first three-way valve 71 is connected to the inlet of the second three-way valve 72; the first outlet (C-port) of the second three-way valve 72 is connected to the inlet of the compressor 2; and the second outlet (D-port) of the second three-way valve 72 is connected to the first outlet of the first three-way valve 71. The refrigerant pipeline 5 between the second outlet of the first three-way valve 71 and the inlet of the second three-way valve 72 has a refrigerant pipeline heat exchange section 51 located on the outer wall of the motor mounting cavity 34. To improve heat exchange efficiency, the refrigerant pipeline heat exchange section 51 is attached to and coiled on the outer wall of the motor mounting cavity 34, thereby allowing heat exchange between the refrigerant pipeline heat exchange section 51 and the heat dissipation motor 322 inside the motor mounting cavity 34.

[0038] The refrigeration range hood system of this embodiment includes a first temperature sensor 81, a second temperature sensor 82, a third temperature sensor 83, a fourth temperature sensor 84, and a controller. The first temperature sensor 81 is installed inside the motor mounting cavity 34 to detect the internal temperature of the motor mounting cavity 34. The second temperature sensor 82 is installed at the indoor unit return air vent 43 of the indoor unit module 4 to detect the ambient temperature outside the range hood. The third temperature sensor 83 is installed on the refrigerant pipeline 5 between the outlet of the refrigerant pipeline heat exchange section 51 and the inlet of the second three-way valve 72 to detect the pipeline temperature at the outlet of the refrigerant pipeline heat exchange section 51. The fourth temperature sensor 84 is installed on the refrigerant pipeline 5 between the outlet of the evaporator 41 and the inlet of the compressor 2 to detect the pipeline temperature at the outlet of the evaporator 41. The controller can receive the output signals from the first temperature sensor 81, the second temperature sensor 82, the third temperature sensor 83, and the fourth temperature sensor 84, and control the switching of the first three-way valve 71 and the second three-way valve 72 accordingly based on the received signals.

[0039] like Figure 4 As shown, the control method of this refrigerated range hood system includes the following steps:

[0040] S1. The range hood is set to cooling mode.

[0041] S2. Determine whether the temperature T1 detected by the first temperature sensor 81 satisfies T1≥ΔT℃, where ΔT is the maximum ambient temperature that the cooling motor 322 can withstand.

[0042] If so, proceed to step S3;

[0043] If not, then close the second outlet of the first three-way valve 71, and the refrigeration system will operate normally;

[0044] S3. Adjust the first three-way valve 71. The opening of the first outlet of the first three-way valve 71 decreases, the opening of the second outlet increases, and the temperature T1 decreases. Then proceed to step S4.

[0045] S4. Determine whether T1≥ΔT℃ is satisfied.

[0046] If so, return to step S3;

[0047] If not, proceed to step S5;

[0048] S5. Determine whether the temperature T1 detected by the first temperature sensor 81 satisfies T1≥t℃, where t is the ambient temperature detected by the second temperature sensor 82.

[0049] If so, proceed to step S6;

[0050] If not, adjust the first three-way valve 71, increase the opening of the first outlet of the first three-way valve 71, decrease the opening of the second outlet of the second three-way valve 72, and then return to step S2;

[0051] S6. Determine whether the temperature T3 detected by the third temperature sensor 83 satisfies T3≥T4℃, where T4 is the temperature at the outlet of the evaporator 41 detected by the fourth temperature sensor 84.

[0052] If so, the first outlet of the second three-way valve 72 will open, the second outlet will close, and the system will operate normally.

[0053] If not, the first outlet of the second three-way valve 72 will be closed and the second outlet will be open, and the system will operate normally.

[0054] As can be seen from the above control logic, the refrigerant pipeline 5 flowing into the evaporator 41 through the throttling device 6 is designed with a bifurcated flow path by the first three-way valve 71. One path is introduced into the evaporator 41 along the A direction, and the other path goes to the motor installation cavity 34 where the cooling motor 32 is located along the B direction. And this refrigerant pipeline 5 is closely coiled and arranged on the wall surface of the motor installation cavity 34. The flow direction and flow rate of both the A path and the B path are controlled by the first three-way valve 71. The refrigerant flowing along the B direction reaches the wall surface of the motor installation cavity 34, and the cold quantity in the refrigerant is used to cool the motor installation cavity 34, so as to control the temperature of the cooling motor 32 within the required temperature. If the internal temperature of the motor installation cavity 34 detected by the first temperature sensor 81 is lower than the ambient temperature detected by the second temperature sensor 82, that is, T1 < t °C, at this time, condensate may be generated on the surface of the motor installation cavity 34, indicating that the flow rate in the B direction is too large. Therefore, it is necessary to reduce the flow rate in the B direction to avoid the generation of condensate.

[0055] Since the cold quantity required to cool the motor installation cavity 34 is small, there may still be residual cold quantity in the refrigerant flowing through the B direction. A second three-way valve 72 is provided at the refrigerant pipeline after the coiling in the motor installation cavity 34. The second three-way valve 72 divides the flow path into two paths. One path flows along the C direction to the compressor 2, and the other path continues to flow along the D direction to the evaporator 41. A third temperature sensor 83 is arranged at the pipeline after the coiling in the independent cavity, and a fourth temperature sensor 84 is arranged at the outlet pipe of the evaporator 41. The flow direction of the refrigerant after cooling the motor installation cavity 34 needs to be judged according to the temperature. When T3 ≥ T4 °C, the second three-way valve 72 is directed to the C direction, and the system operates normally. When T3 < T4 °C, it means that there is residual cold quantity, and the second three-way valve 72 is directed to the D direction for internal machine refrigeration and heat exchange.

[0056] As used herein, "fluidly connected" refers to the spatial position relationship between two components or parts, hereinafter uniformly referred to as the first part and the second part respectively, that is, a fluid (gas, liquid or a mixture of both) can flow or / and be transported from the first part along a flow path to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid channel such as a pipeline, a passage, a conduit, a flow guide, a hole, a groove, etc., or a cavity allowing the fluid to flow through, or a combination of the above.

Claims

1. A refrigerated range hood system, comprising a range hood module (1), a compressor (2), a heat dissipation module (3), and an indoor unit module (4), wherein the range hood module (1) includes a range hood fan (11), the heat dissipation module (3) and the indoor unit module (4) are located outside the range hood fan (11), the heat dissipation module (3) includes a condenser (31) and a heat dissipation fan (32), the heat dissipation fan (32) having fan blades (321) and a heat dissipation motor (322) for driving the fan blades (321) to rotate, the indoor unit module (4) includes an evaporator (41) and an indoor unit fan (42), wherein the compressor (2), the condenser (31) and the evaporator (41) are connected by a refrigerant pipeline (5), and a throttling device (6) is installed on the refrigerant pipeline (5) between the condenser (31) and the evaporator (41), characterized in that: The heat dissipation module (3) has a heat dissipation cavity (33) and a motor mounting cavity (34) that are isolated from each other. The condenser (31) and the fan blade (321) are installed in the heat dissipation cavity (33), and the heat dissipation motor (322) is installed in the motor mounting cavity (34). It also includes a first three-way valve (71) and a second three-way valve (72). The inlet of the first three-way valve (71) is connected to the outlet of the throttling device (6), and the first outlet of the first three-way valve (71) is connected to the evaporator (41). The first three-way valve (71) is connected to the second outlet of the first three-way valve (72), the second outlet of the second three-way valve (72) is connected to the inlet of the compressor (2), the second outlet of the second three-way valve (72) is connected to the first outlet of the first three-way valve (71), and the refrigerant pipeline (5) between the second outlet of the first three-way valve (71) and the inlet of the second three-way valve (72) can exchange heat with the heat dissipation motor (322) in the motor mounting cavity (34).

2. The refrigeration range hood system according to claim 1, characterized in that: The refrigerant pipeline (5) between the second outlet of the first three-way valve (71) and the inlet of the second three-way valve (72) has a refrigerant pipeline heat exchange section (51) arranged on the outer wall of the motor mounting cavity (34).

3. The refrigeration range hood system according to claim 2, characterized in that: The refrigerant pipeline heat exchange section (51) is attached and coiled on the outer wall of the motor mounting cavity (34).

4. The refrigeration range hood system according to claim 2, characterized in that: It also includes a first temperature sensor (81), a second temperature sensor (82), a third temperature sensor (83), a fourth temperature sensor (84), and a controller. The first temperature sensor (81) is used to detect the internal temperature of the motor mounting cavity (34), the second temperature sensor (82) is used to detect the external ambient temperature of the range hood, the third temperature sensor (83) is used to detect the pipe temperature at the outlet of the refrigerant pipe heat exchange section (51), and the fourth temperature sensor (84) is used to detect the pipe temperature at the outlet of the evaporator (41). The controller can receive the output signals of the first temperature sensor (81), the second temperature sensor (82), the third temperature sensor (83), and the fourth temperature sensor (84) and control the working state of the first three-way valve (71) and the second three-way valve (72) according to the received signals.

5. The refrigeration range hood system according to claim 4, characterized in that: The first temperature sensor (81) is installed inside the motor mounting cavity (34).

6. The refrigeration range hood system according to claim 4, characterized in that: The indoor unit module (4) has an indoor unit return air vent (43), and the second temperature sensor (82) is installed at the indoor unit return air vent (43) of the indoor unit module (4).

7. The refrigeration range hood system according to claim 4, characterized in that: The third temperature sensor (83) is installed on the refrigerant pipeline (5) between the outlet of the heat exchange section (51) of the refrigerant pipeline and the inlet of the second three-way valve (72), and the fourth temperature sensor (84) is installed on the refrigerant pipeline (5) between the outlet of the evaporator (41) and the inlet of the compressor (2).

8. The refrigeration range hood system according to claim 1, characterized in that: The air outlet of the cooling fan (32) is fluidly connected to the air inlet of the fume extractor (11).

9. A control method for a refrigerated range hood system, characterized in that: This control method is applied to the refrigeration range hood system of claim 4, and the control method includes the following steps: S1. The range hood is set to cooling mode. S2. Determine whether the temperature T1 detected by the first temperature sensor (81) satisfies T1≥ΔT℃, where ΔT is the maximum ambient temperature that the cooling motor (322) can withstand. If so, proceed to step S3; If not, the second outlet of the first three-way valve (71) is closed, and the refrigeration system operates normally; S3. Adjust the first three-way valve (71). The opening of the first outlet of the first three-way valve (71) decreases, the opening of the second outlet increases, the temperature T1 decreases, and then proceed to step S4. S4. Determine whether T1≥ΔT℃ is satisfied. If so, return to step S3; If not, proceed to step S5; S5. Determine whether the temperature T1 detected by the first temperature sensor (81) satisfies T1≥t℃, where t is the ambient temperature detected by the second temperature sensor (82). If so, proceed to step S6; If not, adjust the first three-way valve (71), increase the opening of the first outlet of the first three-way valve (71), decrease the opening of the second outlet of the second three-way valve (72), and then return to step S2; S6. Determine whether the temperature T3 detected by the third temperature sensor (83) satisfies T3≥T4℃, where T4 is the temperature at the outlet of the evaporator (41) detected by the fourth temperature sensor (84). If so, the first outlet of the second three-way valve (72) will open, the second outlet will close, and the system will operate normally; If not, the first outlet of the second three-way valve (72) will be closed and the second outlet will be opened, and the system will operate normally.

Images