Disclosure of utility model
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a heat management system, wherein a heating waterway and a motor heat exchange waterway share a radiator, so that the utilization rate of the radiator is improved; the motor can heat the battery, and the heat pump or the electric heater can heat the battery and the passenger cabin simultaneously.
The utility model further provides a vehicle.
A thermal management system according to an embodiment of the first aspect of the utility model comprises: a battery heat exchange waterway; heating waterway; a motor heat exchange waterway; an electric control heat exchange waterway; the radiator is communicated with the motor heat exchange waterway at one end, and the other end of the radiator is respectively communicated with the heating waterway and the electric control heat exchange waterway; the control valve is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is communicated with a heating waterway, the second valve port is communicated with a motor heat exchange waterway, the third valve port is communicated with a heat exchanger, and the fourth valve port is communicated with a battery heat exchange waterway.
According to the heat management system provided by the embodiment of the utility model, the heating waterway and the motor heat exchange waterway share the radiator, so that the utilization rate of the radiator is improved; the motor can heat the battery, and the heat pump or the electric heater can heat the battery and the passenger cabin simultaneously.
According to some embodiments of the utility model, the number of the heat sinks is at least two, and the two heat sinks are connected in series.
According to some embodiments of the utility model, the thermal management system further comprises: the heating radiator comprises a first three-way valve, wherein a fifth valve port, a sixth valve port and a seventh valve port are arranged on the first three-way valve, the fifth valve port is communicated with the other end of the radiator, the sixth valve port is respectively communicated with the heating waterway and the electric control heat exchange waterway, and the seventh valve port is communicated with the motor heat exchange waterway.
According to some embodiments of the utility model, the thermal management system further comprises: the motor heat exchange water path comprises a motor heat exchange water path, a radiator, a first three-way pipe, a third three-way pipe and a fourth three-way pipe, wherein one end of the first three-way pipe is communicated with the seventh valve port, the other end of the first three-way pipe is communicated with one end of the radiator, and the other end of the first three-way pipe is communicated with the motor heat exchange water path.
According to some embodiments of the utility model, the thermal management system further comprises: the second three-way valve is provided with an eighth valve port, a ninth valve port and a tenth valve port, the eighth valve port is respectively communicated with the heating waterway and the electric control heat exchange waterway, the ninth valve port is communicated with the control valve, and the tenth valve port is respectively communicated with the heat exchanger and the battery heat exchange waterway.
According to some embodiments of the utility model, the thermal management system further comprises: the first connecting waterway is arranged between the sixth valve port and the heating waterway, one end of the second connecting waterway is connected between the second three-way valve and the battery heat exchange waterway, and the other end of the second connecting waterway is connected to the first connecting waterway.
According to some embodiments of the utility model, the thermal management system further comprises: the first check valve is arranged on the first connecting waterway, and the first check valve is arranged on the second connecting waterway.
According to some embodiments of the utility model, the thermal management system further comprises: the third three-way valve is provided with an eleventh valve port, a twelfth valve port and a thirteenth valve port, the eleventh valve port is communicated with the electric control heat exchange waterway, the twelfth valve port is communicated with the second three-way valve, and the thirteenth valve port is communicated with the heat exchanger.
According to some embodiments of the utility model, the heating waterway includes: the air conditioner comprises a warm air core, an electric heater, a condenser and a second one-way valve, wherein one end of the warm air core is communicated with one end of the electric heater, the other end of the electric heater is communicated with one end of the condenser, the other end of the condenser is communicated with one end of the second one-way valve, and the other end of the second one-way valve is communicated with the other end of the warm air core; the thermal management system further comprises: an air conditioning system, the air conditioning system comprising: the condenser, the compressor and the evaporator, the compressor is connected between the condenser and the evaporator.
According to some embodiments of the utility model, the battery heat exchange waterway comprises: the heat exchanger comprises a battery and a first water pump, wherein one end of the battery is communicated with one end of the first water pump, the other end of the battery is communicated with the heat exchanger, and the other end of the first water pump is communicated with the fourth valve port.
According to a second aspect of the present utility model, a vehicle includes: the thermal management system.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Detailed Description
Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.
A thermal management system 100 according to an embodiment of the present utility model is described below with reference to fig. 1-9, and a vehicle including the upper thermal management system 100 is also presented.
The thermal management system 100 includes: a battery heat exchange waterway 10, a heating waterway 30, a motor heat exchange waterway 20, an electric control heat exchange waterway 40, a radiator 51 and a control valve 61. The battery heat exchange waterway 10 includes: the battery 11 and the first water pump 12, one end of the battery 11 is communicated with one end of the first water pump 12, the other end of the first water pump 12 is communicated with the heat exchanger 52, and the other end of the first water pump 12 is communicated with the control valve 61. The coolant flows through the battery heat exchange water path 10 by the driving of the first water pump 12, and if the coolant flowing through the battery heat exchange water path 10 is higher than the temperature of the battery 11, the coolant heats the battery 11, and if the coolant flowing through the battery heat exchange water path 10 is lower than the temperature of the battery 11, the battery 11 is cooled.
The motor heat exchange waterway 20 includes: and a motor 21, wherein the motor is heated by the cooling liquid when the cooling liquid flowing through the motor heat exchange water path 20 is higher than the temperature of the motor 21, and the motor 21 is cooled when the cooling liquid flowing through the motor heat exchange water path 20 is lower than the temperature of the motor 21.
The electrically controlled heat exchange waterway 40 includes: the electric control device 41 heats the electric control device 41 if the cooling liquid flowing through the electric control heat exchange waterway 40 is higher than the temperature of the electric control device 41, and cools the electric control device 41 if the cooling liquid flowing through the electric control heat exchange waterway 40 is lower than the temperature of the electric control device 41.
The heating waterway 30 includes: the heating water path 30 is circulated with cooling liquid, the condenser 33 can absorb heat of an air conditioning system, and the heating water path 33 can exchange heat with the battery heat exchange water path 10 to absorb heat. The heating waterway 30 further includes: and one end of the warm air core 32 is communicated with one end of the electric heater 31, the other end of the electric heater 31 is communicated with one end of the condenser 33, the other end of the condenser 33 is communicated with one end of the second one-way valve 34, and the other end of the second one-way valve 34 is communicated with the other end of the warm air core 32. The condenser 33 is an air-cooled condenser 33, the condenser 33 circulates refrigerant in the air conditioning system, and the refrigerant can exchange heat with the cooling liquid in the heat exchanger 52; the condenser 33 is also circulated with a coolant, which releases heat of the refrigerant to the heating waterway 30.
The heating waterway 30 further includes: and a second water pump 35, the second water pump 35 being connected between the condenser 33 and the electric heater 31, i.e., one end of the second water pump 35 being in communication with the other end of the condenser 33, and the other end of the second water pump 35 being in communication with the other end of the electric heater 31. Wherein the electric heater 31 may be a PTC.
The thermal management system 100 further includes: an air conditioning system, the air conditioning system comprising: the compressor is connected between the condenser 33 and the evaporator as shown in fig. 1 to 9, the refrigerant circuit 80 is a region shown by a dotted line, and the refrigerant in the condenser 33 exchanges heat with the cooling liquid of the heat exchanger 52, so that the refrigerant can absorb heat of the battery heat exchange waterway 10 or the motor heat exchange waterway 20 or the electric control heat exchange waterway 40. The refrigerant flows out of the compressor, releases heat at the condenser 33, absorbs heat at the evaporator, and finally returns to the compressor, and absorbs heat of the passenger compartment when refrigerating, and the cooling water flowing through the condenser 33 releases the heat to the heating waterway 30.
The control valve 61 is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is communicated with the heating waterway 30, the second valve port is communicated with the motor heat exchange waterway 20, the third valve port is communicated with the heat exchanger 52, and the fourth valve port is communicated with the battery heat exchange waterway 10, namely, the fourth valve port is communicated with the other end of the first water pump 12. The first valve port is the port a in fig. 1-9; the second valve port is the port b in fig. 1-9; the third valve port is the c port in fig. 1-9; the fourth port is the d port in fig. 1-9.
The control valve 61 may communicate the first valve port and the second valve port, and the third valve port and the fourth valve port, that is, the heating waterway 30 and the motor heat exchange waterway 20. When cooling the passenger compartment and the battery 11, the condenser 33 releases the heat of the battery 11 and the passenger compartment to the heating water path 30, and the cooling liquid flows from the heating water path 30 to the motor heat exchanging water path 20, and the cooling liquid absorbs the heat of the motor 21 in the motor heat exchanging water path 20.
Since one end of the radiator 51 is communicated with the motor heat exchanging waterway 20, the other end of the radiator 51 is respectively communicated with the heating waterway 30 and the electric control heat exchanging waterway 40. The heating waterway 30 may be communicated with the motor heat exchanging waterway 20, and then the cooling liquid absorbs heat of the heating loop and the motor heat exchanging waterway 20, the cooling liquid flows to the radiator 51, and the heat is emitted into the air at the radiator 51, and finally flows back to the heating waterway 30.
As shown in fig. 2, the thermal management system 100 is in a first mode that enables cooling of the refrigerated passenger compartment, the motor 21, and the electronic control device 41, and cooling of the battery 11, which may be turned off if the battery 11 has no cooling demand, without affecting the remaining functions. The condenser 33 absorbs the heat of the passenger cabin, if the battery 11 has a cooling requirement, the heat exchanger 52 is started, and the condenser 33 can absorb the heat of the battery 11; if there is no cooling demand on the battery 11, the heat exchanger 52 is turned off. The condenser 33 releases heat to the heating waterway 30, the control valve 61 communicates the heating waterway 30 and the motor heat exchanging waterway 20, the cooling fluid flowing in the heating waterway 30 flows to the motor heat exchanging waterway 20, if the temperature of the cooling fluid is lower than that of the motor 21, the cooling fluid absorbs the heat of the motor 21, flows to the radiator 51, and radiates the heat of the passenger compartment and the heat of the motor 21 to the air at the radiator 51; if the temperature of the coolant is higher than the temperature of the motor 21, the coolant flows to the radiator 51 to radiate the cabin heat into the air. The other end of the radiator 51 is respectively communicated with the heating waterway 30 and the electric control heat exchange waterway 40, so that the cooling liquid after the radiator 51 radiates heat is divided into two parts, and one part flows to the heating waterway 30 and enters the next cycle; the other part flows to the electric control waterway, the cooling liquid absorbs the heat of the electric control waterway, and finally the cooling liquid of the heating waterway 30 and the cooling liquid of the heating waterway 30 are converged and then flow to the motor heat exchange waterway 20 to enter the next circulation.
When the passenger cabin is heated, the heating waterway 30 can heat the passenger cabin through the electric heater 31, and can also heat the passenger cabin through the heat pump.
When the electric heater 31/heat pump heats the passenger cabin or the battery 11, the heat exchanger 52 can absorb the heat of the motor heat exchange waterway 20, the cooling liquid absorbs the environmental heat at the radiator 51, finally the heat is released to the heating waterway 30 from the condenser 33 through the air conditioning system, the control valve 61 is communicated with the first valve port and the fourth valve port, the heating waterway 30 is communicated with the battery heat exchange waterway 10, and the high-temperature cooling liquid flows from the heating waterway 30 to the battery heat exchange waterway 10 to heat the battery 11, so that the passenger cabin and the battery 11 can be heated by the electric heater 31.
When the temperature of the battery 11 is higher and the ambient temperature is lower, the cooling liquid in the heat exchanger 52 absorbs the heat of the battery 11, the condenser 33 exchanges heat with the heat exchanger 52, the refrigerant in the condenser 33 absorbs the heat of the cooling liquid, and then the condenser 33 radiates the heat of the battery 11 to the heating waterway 30 to heat the passenger cabin, so that the functions of heating the passenger cabin by the heat pump and heating the battery 11 are realized.
In the second mode, as shown in fig. 3, the passenger cabin can be heated by the electric heater 31, the heating water channel 30 can deliver warm air to the passenger cabin by the warm air core 32, so as to realize heating requirements, the motor heat exchange water channel 20, the electric control water channel and the battery heat exchange water channel 10 are connected in series, and the electric control device 41 and the motor 21 can be used for heating the battery 11 in series. The heat exchanger 52 can be turned on or not according to the use requirement and the control strategy, if the heat of the motor 21 and the electric control device 41 is excessive, the heat exchanger 52 can be turned on to provide heat for the air conditioner/heat pump system, and the passenger cabin heating is assisted, if the heat is not excessive, the heat exchanger 52 is turned off, the heat pump has no heat source, and at this time, the passenger cabin heating function needs the electric heater 31 to supply heat.
In the third mode, as shown in fig. 5, when the battery 11 has no heating requirement, passenger compartment heating can be performed through the conventional heat pump heating waterway 30. Refrigerant side: the heat exchanger 52 absorbs the heat of the cooling liquid and brings the heat into the air-conditioning waterway, and the heat is released to the heating waterway 30 through the condenser 33; cooling liquid side: the cooling liquid becomes the cooling liquid with the excessively low temperature (the temperature is lower than the ambient temperature) after passing through the heat exchanger 52, then flows into the motor heat exchange waterway 20 to absorb heat, if the water temperature at the inlet of the radiator 51 is lower than the ambient temperature, the first three-way valve 62 is adjusted to the position shown in fig. 5, the heat in the environment is absorbed by the radiator 51, and the cooling liquid is recycled to the electric control heat exchange waterway 40 and finally flows back to the heat exchanger 52. The heat pump system achieves heat transfer from the environment, the electronic control 41, the motor 21 to the heating waterway 30 of the passenger compartment.
As shown in fig. 6, when the heat pump is just turned on and the water temperature at the inlet of the radiator 51 is still higher than the ambient temperature, the first three-way valve 62 needs to be adjusted to a state of shorting the radiator 51, and at this time, the heat pump system can only absorb the heat of the electric control device 41 and the motor 21, and prevent the heat loss caused by the high-temperature coolant flowing through the radiator 51.
Thus, the heating water path 30 and the motor heat exchange water path 20 share the radiator 51, and the utilization rate of the radiator 51 is improved; the function of heating the battery 11 by the motor and the function of heating the battery 11 and the passenger cabin by the heat pump or the electric heater 31 can be realized.
In some embodiments, the number of heat sinks 51 is at least two, with two heat sinks 51 being connected in series with each other. The number of the heat sinks 51 can be two, so that the heat dissipation capacity of the thermal management system 100 is ensured, and the heat dissipation efficiency of the thermal management system 100 is improved.
In other embodiments, the heat sink 51 may be one, saving cost and improving the utilization efficiency of the heat sink 51.
As shown in fig. 1-9, thermal management system 100 further includes: the first three-way valve 62, the first three-way valve 62 is provided with a fifth valve port, a sixth valve port and a seventh valve port, the fifth valve port is communicated with the other end of the radiator 51, the sixth valve port is respectively communicated with the heating waterway 30 and the electric control heat exchange waterway 40, and the seventh valve port is communicated with the motor heat exchange waterway 20. The fifth valve port is the e port in fig. 1-9; the sixth valve port is the f port in fig. 1-9; the seventh valve port is the g port in fig. 1-9.
The fifth valve port can be closed, and then the sixth valve port is communicated with the seventh valve port, and the motor heat exchange waterway 20 is communicated with the heating waterway 30 and the electric control heat exchange waterway 40. That is, the coolant flowing out of the motor heat exchange water path 20 does not radiate heat through the radiator 51.
When the seventh valve port is closed, the fifth valve port is communicated with the sixth valve port, so that the cooling liquid flowing out of the motor heat exchange waterway 20 flows through the radiator 51, and flows to the heating waterway 30 and the electric control heat exchange waterway 40 at the radiating port of the radiator 51.
As shown in fig. 4, when the first three-way valve 62 is adjusted to be in a state of turning on the radiator 51, the series cooling of the parts such as the motor 21 and the battery 11 can be simultaneously performed by the radiator 51.
The thermal management system 100 further includes: the first three-way pipe 63, one end of the first three-way pipe 63 is communicated with the seventh valve port, the other end of the first three-way pipe 63 is communicated with one end of the radiator 51, and the other end of the first three-way pipe 63 is communicated with the motor heat exchange waterway 20. The first tee 63 allows the coolant flowing out of the motor heat exchange waterway 20 to flow to the radiator 51 or to flow to the heating waterway 30 and the electric control heat exchange waterway 40. When the fifth valve port is closed, one end of the first three-way pipe 63 is communicated with the seventh valve port, and the motor heat exchange waterway 20, the heating waterway 30 and the electric control heat exchange waterway 40 are communicated; when the seventh valve port is closed, the first three-way pipe 63 is communicated with the motor heat exchange waterway 20 and the radiator 51, and the first three-way valve 62 is communicated with the radiator 51, the heating waterway 30 and the electric control heat exchange waterway 40.
As shown in fig. 1-9, thermal management system 100 further includes: the second three-way valve 64, the second three-way valve 64 is provided with an eighth valve port, a ninth valve port and a tenth valve port, the eighth valve port is respectively communicated with the heating waterway 30 and the electric control heat exchange waterway 40, the ninth valve port is respectively communicated with the control valve 61, and the tenth valve port is respectively communicated with the heat exchanger 52 and the battery heat exchange waterway 10. The eighth valve port is the h port in fig. 1-9; the ninth valve port is the i port in fig. 1-9; the tenth valve port is the j port in fig. 1-9.
When the refrigerating passenger cabin/battery 11 is cooled, the eighth valve port is communicated with the ninth valve port, the first valve port and the second valve port of the control valve 61 are communicated, the third valve port and the fourth valve port are communicated, namely, the heating waterway 30 is communicated with the motor heat exchange waterway 20, and the heat exchanger 52 is communicated with the battery heat exchange waterway 10; the heat exchanger 52 is connected in series with the battery heat exchange waterway 10 and forms a closed loop. The refrigerant in the condenser 33 exchanges heat with the coolant of the heat exchanger 52 to absorb heat of the battery 11, and the coolant of the heating water path 30 exchanges heat with the refrigerant at the condenser 33 to absorb heat of the passenger compartment, that is, the condenser 33 releases the heat of the battery 11 and the passenger compartment to the heating water path 30 together, the coolant flows from the heating water path 30 to the motor heat exchanging water path 20, and the coolant absorbs heat of the motor 21 in the motor heat exchanging water path 20.
When the special heat pump heats the passenger cabin, the ninth valve port is communicated with the tenth valve port, the first valve port and the second valve port of the control valve 61 are communicated, the third valve port and the fourth valve port are communicated, namely, the battery heat exchange waterway 10 is communicated with the motor heat exchange waterway 20, the heat exchanger 52 is communicated with the battery heat exchange waterway 10, the condenser 33 exchanges heat with cooling liquid of the heat exchanger 52, heat of the battery 11 is absorbed, and the condenser 33 releases heat of the battery 11 to the heating waterway 30, so that the passenger cabin is heated.
As shown in fig. 1, thermal management system 100 further includes: the first connection waterway 71 and the second connection waterway 72, the first connection waterway 71 is disposed between the sixth valve port and the heating waterway 30, and the first connection waterway 71 is connected between the sixth valve port and the heating waterway 30, thereby connecting the sixth valve port and the heating waterway 30. When the passenger cabin is refrigerated, the sixth valve port is communicated with the seventh valve port, so that the cooling liquid flowing out of the motor heat exchange waterway 20 is divided into two parts, one part flows to the heating waterway 30, and the other part flows to the electric control heat exchange waterway 40.
In the fourth mode, as shown in fig. 8, when the electric heater 31/heat pump heats the passenger compartment and the battery 11, the heating water channel 30 flows out of the high-temperature coolant, the heat exchanger 52 can absorb heat of the motor heat exchanging water channel 20, the coolant flows through the heat radiator 51 and absorbs ambient heat at the heat radiator 51, finally, heat is released from the condenser 33 to the heating water channel 30 through the air conditioning system, the control valve 61 is communicated with the first valve port and the fourth valve port, the second three-way valve 64 is communicated with the heating water channel 30 and the battery heat exchanging water channel 10, one end of the second connecting water channel 72 is connected between the second three-way valve 64 and the battery heat exchanging water channel 10, the other end of the second connecting water channel 72 is connected to the first connecting water channel 71, the second connecting water channel 72 is connected with the outlet of the battery heat exchanging water channel 10 and the heating water channel 30 is communicated with the battery heat exchanging water channel 10, and the high-temperature coolant flows from the heating water channel 30 to the battery heat exchanging water channel 10, thereby heating the battery 11 is realized, and the passenger compartment and the battery 11 can be heated by the electric heater 31.
Because the second three-way valve 64 can control the flow ratio of the two inlets h and j, the mode can simultaneously realize the functions of the electric heater 31/the heat pump for heating the passenger cabin and the battery 11 on the premise that the power of the electric heater 31 meets the heating requirement of the whole vehicle.
As shown in connection with fig. 1, 2, and 8, thermal management system 100 further includes: the first shut-off valve 65 and the first check valve 66, the first shut-off valve 65 is provided in the first connection waterway 71, and the first check valve 66 is provided in the second connection waterway 72. The first stop valve 65 is opened to communicate the sixth valve port with the heating waterway 30, so that the cooling liquid flowing out of the motor heat exchange waterway 20 is divided into two parts, one part flows to the heating waterway 30, and the other part flows to the electric control heat exchange waterway 40; if the first shutoff valve 65 is closed, the heating water path 30 and the motor heat exchange water path 20 are not connected, and all the coolant flowing out of the motor heat exchange water path 20 flows to the electric control heat exchange water path 40.
When the heat pump is in the passenger cabin heating mode, the heat pump is operated with the minimum power, but the heat generation amount is still higher than the heating requirement of the passenger cabin, and the state as shown in fig. 9 is needed to be switched, and the heat pump heating is performed, and a small amount of low-temperature cooling liquid is provided for the heating water channel 30 by the radiator 51, so that the temperature of the cooling liquid of the heating water channel 30 can be controlled within the target requirement range. At this time, the first stop valve 65 is connected to the sixth valve port and the heating water path 30, and this mode has a special requirement for the second three-way valve 64, and the h and j ports are required to be turned on, and the i port is required to be turned off.
The first check valve 66 is disposed at the second connection waterway 72 such that the coolant in the second connection waterway 72 can flow only in one direction, i.e., back to the heating waterway 30 from the battery heat exchange waterway 10 or the heat exchanger 52.
As shown in fig. 2, the thermal management system 100 further includes: the third three-way valve 67, the third three-way valve 67 is provided with an eleventh valve port, a twelfth valve port and a thirteenth valve port, the eleventh valve port is communicated with the electric control heat exchange waterway 40, the twelfth valve port is communicated with the second three-way valve 64, and the thirteenth valve port is communicated with the heat exchanger 52. The eleventh valve port is the o port in fig. 1-9; the twelfth valve port is the p port in fig. 1-9; the twelfth port is the q port in fig. 1-9.
When the passenger cabin is refrigerated, the eleventh valve port is communicated with the twelfth valve port, the electric control heat exchange waterway 40 is communicated with the eighth valve port of the second three-way valve 64, the cooling liquid flowing out of the battery heat exchange waterway 10 is divided into two parts, one part flows back to the heating waterway 30 through the first connecting waterway 71, the other part of the cooling liquid flows to the eighth valve port after the electric control heat exchange waterway 40 absorbs the heat of the electric control device 41, the eighth valve port is communicated with the ninth valve port, the control valve 61 is communicated with the ninth valve port and the motor heat exchange waterway 20, and the other part of the cooling liquid flows to the motor heat exchange waterway 20, so that the circulation of the other part of the cooling liquid is completed.
Under the individual working conditions, for example, when the heat generated by the battery 11 is too high and needs to be cooled, but the ambient temperature is extremely low, and the passenger cabin needs to be heated, the state of fig. 3 or 7 can be switched, the heat of the battery 11 (state of fig. 7) is absorbed by the heat exchanger 52 or the heat of the battery 11 and the motor (state of fig. 3) is absorbed at the same time, and the heat is released to the heating waterway 30 by the condenser 33, so that the special heat pump heating function is realized.
According to a second aspect of the present utility model, a vehicle includes: thermal management system 100.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.