阅读说明：本技术 一种衣物烘干设备及其控制方法 (Clothes drying equipment and control method thereof ) 是由 黎辉 章发 张晓亮 熊衡 于 2020-04-16 设计创作，主要内容包括：本发明提供一种衣物烘干设备及其控制方法,所述衣物烘干设备包括干衣滚筒、风道和热泵系统,所述热泵系统包括压缩机、冷凝器和蒸发器,所述冷凝器上设置有辅助加热装置。本发明通过在衣物烘干设备的热泵系统中设置辅助加热装置,将辅助加热装置设置在冷凝器上,使得热泵系统快速升温,同时也提高了滚筒内部的温度,加快了衣物的烘干速度,此外,通过本申请提供的控制方法在衣物烘干后进行间歇式的衣物加热,可以在用户未取出衣物的情况下保持衣物的干燥和清洁,防止细菌的滋生,对用户的健康起到重要的保护作用,本发明结构简单,可以显著缩短衣物的烘干时间,更为节能。(The invention provides clothes drying equipment and a control method thereof. In addition, the control method provided by the invention carries out intermittent clothes heating after clothes are dried, can keep clothes dry and clean under the condition that a user does not take out the clothes, prevents bacteria from breeding and plays an important protection role on the health of the user.)

1. The clothes drying equipment comprises a clothes drying roller (1), an air channel and a heat pump system, wherein the heat pump system comprises a compressor (5), a condenser (6) and an evaporator (8), and is characterized in that an auxiliary heating device (10) is arranged on the condenser (6).

2. A laundry drying apparatus according to claim 1, characterized in that said condenser (6) comprises at least two heat exchange assemblies in communication, with a gap being present between adjacent heat exchange assemblies, at least one gap being provided with auxiliary heating means (10).

3. A laundry drying apparatus according to claim 1, characterized in that the compressor (5) is arranged between the outlet of the evaporator (8) and the inlet of the condenser (6), the exhaust duct of the compressor (5) communicating with the condenser (6) through a first conduit (9), the heat pump system further comprising a throttling device (7), the two ends of the throttling device (7) communicating with the outlet of the condenser (6) and the inlet of the evaporator (8), respectively.

4. A laundry drying apparatus as claimed in claim 3, characterized in that a first temperature sensor (12) is provided at the exhaust of said compressor (5) and a second temperature sensor (13) is provided at the outlet of said condenser (6).

5. A clothes drying device according to any one of claims 1 to 4, characterized in that the air duct comprises an air inlet duct (3) and an air outlet duct (2), the air outlet of the air inlet duct (3) is communicated with the air inlet of the clothes drying roller (1), the air inlet of the air outlet duct (2) is communicated with the air outlet of the clothes drying roller (1), the other ends of the air inlet duct (3) and the air outlet duct (2) are both communicated with the heat pump system, the evaporator (8) is arranged at a position close to the air outlet of the air outlet duct (2), and the condenser (6) is arranged at a position close to the inlet of the air inlet duct (3).

6. A laundry drying apparatus as claimed in claim 4, characterized in that the laundry drying apparatus further comprises a circulation fan (4), the circulation fan (4) being arranged in the intake air duct (3) for feeding hot air passing through the heat pump system into the laundry drum (1).

7. A laundry drying apparatus as claimed in claim 4, characterized in that the air inlet of the outlet air duct (2) is provided with a third temperature sensor (14).

8. A laundry drying apparatus as claimed in claim 1, characterized in that said auxiliary heating device (10) is a ceramic PTC heater and/or an electric heating tube.

9. The clothes drying equipment as claimed in claim 2, wherein the heat exchange assembly is one or a combination of a copper-aluminum heat exchanger, a micro-channel heat exchanger, an aluminum tube-aluminum fin heat exchanger and a full-aluminum heat exchanger.

10. A control method of a laundry drying apparatus for controlling the laundry drying apparatus as claimed in any one of claims 1 to 9, the control method comprising the steps of:

s1: starting the clothes drying equipment;

s2: detecting an ambient temperature T1, comparing the detected ambient temperature T1 with a first preset temperature T1, and when T1 < T1, executing S3; when T1 is more than or equal to T1, executing S4;

s3: starting the auxiliary heating device, and when the detected ambient temperature reaches the fourth preset temperature T₄Time-off auxiliary heating device, wherein T₄≥T₁；

S4: drying the clothes;

s5: prompting a user after drying is finished;

s6: after a first preset time M₁Then, the user takes out the clothes, and then the machine is turned off to finish the work; if the user does not take out the clothes, executing S7;

s7: detecting the ambient temperature t₁< second predetermined temperature T₂If yes, the circulating fan and the auxiliary heating device are started, otherwise, S6 is executed;

s8: running for a second preset time M₂And/or to detect the ambient temperature t₁Not less than third preset temperature T₃Wherein T is₃＞T₂Closing the auxiliary heating device and the circulating fan;

s9: judging whether the time from the completion of the drying of the clothes to the current time reaches the preset total time length M₃If yes, shutting down the machine and finishing the work; otherwise, go to S6;

when the user takes out the clothes during the execution of any one of S6-S9, the operation is immediately finished and the machine is turned off.

Technical Field

The invention relates to the field of clothes washing and drying, in particular to clothes drying equipment and a control method thereof.

Background

With the development of social economy, the clothes drying equipment is popularized and used, and particularly in areas with high humidity, the clothes drying function of the clothes drying equipment meets the requirement of people on clothes drying urgently. The drying system of a conventional laundry drying apparatus or clothes drying apparatus generally includes several types, such as an electric heating water condensing and drying system, an electric heating air condensing and drying system, and a heat pump heating and drying system in which an evaporator condenses and a condenser heats. Compared with the first two drying systems, the heat pump heating and drying system is relatively energy-saving, and has wider market application prospect.

When the ambient temperature is lower (for example, less than 15 ℃), more heat is needed to enable all parts of the clothes dryer to reach a proper working state, the temperature rising speed of the whole system is slower by about 40% than that of a normal-temperature environment by 23 ℃, so that the drying time is prolonged, and the temperature inside the roller is lower during operation, so that a good drying effect cannot be achieved, and user experience is influenced.

Disclosure of Invention

The invention solves the problems that in the prior art, the temperature of the heat pump clothes drying equipment is slowly increased when the ambient temperature is lower, the clothes drying time is longer, and after the clothes are dried, a user does not take the heat pump clothes drying equipment out for a long time, so that peculiar smell or bacteria are easy to appear on the clothes.

In order to solve the above problems, the present invention provides a clothes drying apparatus and a control method thereof, wherein an auxiliary heating device is arranged in a heat pump system of the clothes drying apparatus, and the auxiliary heating device is arranged in a gap of a condenser, so that the heat pump system is heated rapidly, the temperature inside a drum is increased, and the clothes drying speed is increased.

The invention discloses clothes drying equipment which comprises a clothes drying roller, an air channel and a heat pump system, wherein the heat pump system comprises a compressor, a condenser and an evaporator, and is characterized in that an auxiliary heating device is arranged on the condenser.

When the ambient temperature is lower, more heat is needed to make all parts of the clothes dryer reach the proper working temperature. Through set up auxiliary heating device on the condenser, the air that can rapid heating passes through to improve dry clothing cylinder fast and pass through the gas temperature on heat exchanger surface, the circulating air also heats the spare part in the wind channel simultaneously, thereby shortens heat pump system's intensification time, reaches the purpose of fast drying clothing, auxiliary heating device can set up in the middle of the condenser, also can overlap and establish on the condenser.

Furthermore, the condenser comprises at least two heat exchange assemblies communicated with each other, a gap is formed between every two adjacent heat exchange assemblies, and an auxiliary heating device is arranged in at least one gap.

The clearance between the condenser is one at least, the direction of placing of condenser can with the evaporimeter is parallel, also can with the evaporimeter is perpendicular, auxiliary heating device can directly set up in the clearance, also can establish through the clearance cover heat exchange assembly is last.

Further, the compressor sets up the export of evaporimeter with between the entry of condenser, the blast pipe of compressor passes through first pipeline and condenser intercommunication, heat pump system still includes throttling arrangement, throttling arrangement's both ends respectively with the export of condenser and the entry intercommunication of evaporimeter.

The evaporator is used for absorbing heat and sending the refrigerant into the compressor after the refrigerant is vaporized, the compressor changes the vaporized refrigerant into high-pressure high-temperature gas and sends the gas into the condenser, the condenser is used for releasing heat from the high-pressure high-temperature gas so as to heat air passing through the surface of the condenser, and the throttling device is used for changing the high-temperature high-pressure refrigerant sent out from the condenser into low-pressure low-temperature refrigerant and sending the low-pressure low-temperature refrigerant into the evaporator, so that the cyclic utilization of the refrigerant is realized.

Furthermore, a first temperature sensor is arranged on the exhaust pipe of the compressor, and a second temperature sensor is arranged at the outlet of the condenser.

The clothes drying equipment is provided with the temperature sensors for monitoring the ambient temperature in real time, so that different operations can be executed when the ambient temperature reaches a preset value, and energy and time are saved.

Further, the wind channel includes air inlet wind channel and air outlet wind channel, the air outlet in air inlet wind channel and the air intake intercommunication of dry clothing cylinder, the air intake in air outlet wind channel and the air outlet intercommunication of dry clothing cylinder, the other end in air inlet wind channel and air outlet wind channel all communicates with heat pump system, the evaporimeter sets up in the position that is close to air outlet wind channel air outlet, the condenser sets up in the position that is close to air inlet wind channel entry.

The air inlet duct is used for conveying hot dry air into the clothes drying roller so as to dry clothes in the clothes drying roller, during drying, moisture in the clothes is evaporated to become water vapor, the air outlet duct is used for discharging wet hot air containing the water vapor from the clothes drying roller after the clothes are dried so as to continuously dry the clothes by feeding new hot dry air through the air inlet duct, the air outlet duct conveys the wet hot air into the heat pump system, the heat pump system treats the wet hot air and sends the wet hot air into the air inlet duct after the wet hot air is changed into the hot dry air, air circulation in the clothes drying equipment is realized, when the wet hot air discharged from the air outlet duct passes through the evaporator, a refrigerant in the evaporator absorbs heat to be vaporized, and at the moment, the wet hot air is cooled, the water vapor contained in the wet hot air is condensed and discharged to become low-temperature dry air, and when the low-temperature dry air passes through the condenser, absorb the heat released by the refrigerant, and then heated rapidly to dry hot air, which is sent into the drying drum through the air inlet duct to dry the clothes.

Furthermore, the clothes drying equipment also comprises a circulating fan, wherein the circulating fan is arranged in the air inlet duct and used for sending hot air passing through the heat pump system into the clothes drying roller.

The circulating fan is used for sending dry hot air into the clothes drying roller, so that air in the system is pushed to flow, and drying of clothes is achieved.

Furthermore, an air inlet of the air outlet duct is provided with a third temperature sensor.

The third temperature sensor is also used for monitoring the ambient temperature, and is mainly used for detecting the time period when the clothes are not taken out by the user after the drying work is finished, so that different operations can be executed according to the monitoring result.

Further, the auxiliary heating device is a ceramic PTC heater and/or an electric heating tube.

The auxiliary heating device is arranged in the gap of the condenser, the ceramic PTC heater and the electric heating pipe have the characteristics of high heating speed and uniform heating, and can quickly reach the target temperature.

Further, the heat exchange assembly is one or a combination of a plurality of copper-aluminum heat exchangers, micro-channel heat exchangers, aluminum tube aluminum fin heat exchangers and full aluminum heat exchangers.

The heat exchange component can be copper aluminum + copper aluminum, or copper aluminum + microchannel, or microchannel + microchannel, or aluminum tube + aluminum tube, or a combination of the above heat exchangers, and is specifically arranged according to the model, efficacy and space size of the equipment.

The invention also discloses a control method of the clothes drying equipment, which is used for controlling the clothes drying equipment and comprises the following steps:

s1: starting the clothes drying equipment;

s2: detecting the ambient temperature t₁Ambient temperature t to be detected₁And a first predetermined temperature T₁Making a comparison when t₁＜T₁When so, go to S3; when t is₁≥T₁When so, go to S4;

s3: starting the auxiliary heating device, and when the detected ambient temperature reaches the fourth preset temperature T₄Time-off auxiliary heating device, wherein T₄≥T₁；；

S4: drying the clothes;

s5: prompting a user after drying is finished;

s6: after a first preset time M₁Then, the user takes out the clothes, and then the machine is turned off to finish the work; if the user does not take out the clothes, executing S7;

s7: detecting the ambient temperature t₁< second predetermined temperature T₂If yes, the circulating fan and the auxiliary heating device are started, otherwise, S6 is executed;

s8: running for a second preset time M₂And/or to detect the ambient temperature t₁Not less than third preset temperature T₃Wherein T is₃＞T₂Closing the auxiliary heating device and the circulating fan;

s9: judging whether the time from the completion of the drying of the clothes to the current time reaches the preset total time length M₃If yes, shutting down the machine and finishing the work; otherwise, go to S6;

when the user takes out the clothes during the execution of any one of S6-S9, the operation is immediately finished and the machine is turned off.

The ambient temperature t₁Is the temperature in the system pipeline or air duct, in particular, the ambient temperature t₁According to the control method, the preset time M after the clothes drying equipment finishes the drying work can be set as the detection result of any one of the first temperature sensor, the second temperature sensor and the third temperature sensor₃In the time period, if the interval M passes₁When the user does not take out the laundry, while detecting that the ambient temperature is lower than the second preset temperature T₂Then the circulating fan and the auxiliary heating device are started, specifically, the circulating fan is started first, then the auxiliary heating device is started to heat the clothes, and the operation interval time M is set₂And/or detecting that the ambient temperature is greater than a third preset temperature T₃And then, closing the circulating fan and the auxiliary heating device, and then judging whether the time length from the drying end to the current time does not reach the preset total time length M₃And in the execution process of any link from S6 to S9, as long as the user takes out the clothes, the operation is finished immediately, so that the clothes drying equipment is more humanized and energy-saving in use.

Compared with the prior art, the clothes drying equipment and the control method thereof have the following advantages: in addition, the control method provided by the invention carries out intermittent clothes heating after clothes are dried, can keep clothes dry and clean under the condition that a user does not take out the clothes, prevents bacteria from breeding, and plays an important role in protecting the health of the user.

Drawings

Fig. 1 is a schematic structural diagram of a laundry drying apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a heat pump system according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a method for controlling a clothes drying apparatus according to an embodiment of the present invention.

Description of reference numerals:

1. a drying drum; 2. an air outlet duct; 3. an air inlet duct; 4. a circulating fan; 5. a compressor; 6. a condenser; 7. a throttling device; 8. an evaporator; 9. a first pipeline; 10. an auxiliary heating device; 11. a second pipeline; 12. a first temperature sensor; 13. a second temperature sensor; 14. a third temperature sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.

A laundry drying apparatus and a control method thereof according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

The present embodiment provides a laundry drying apparatus, as shown in fig. 1, which includes a laundry drum 1, an air duct and a heat pump system, the heat pump system comprises a compressor 5, a condenser 6 and an evaporator 8, wherein an auxiliary heating device 10 is arranged on the condenser 6, when the environmental temperature is lower, more heat is needed to enable all parts of the clothes dryer to reach the proper working temperature, the temperature rise speed is slow, thereby affecting the operation efficiency of the whole heat pump system, and by providing the auxiliary heating device 10 in the middle of the condenser 6, the passing air can be rapidly heated, thereby rapidly increasing the temperature of the air on the surface of the drying roller 1 and the evaporator 8, shortening the temperature rise time of the heat pump system, achieving the purpose of rapidly drying clothes, in particular, the auxiliary heating device 10 may be disposed in the middle of the condenser 6, or may be sleeved on the condenser 6.

As a preferred embodiment, the condenser 6 includes at least two heat exchange assemblies communicated with each other, a gap exists between adjacent heat exchange assemblies, at least one gap is provided with an auxiliary heating device 10, at least one gap is provided between the condensers 6, the condenser 6 can be placed in a direction parallel to the evaporator 8 or perpendicular to the evaporator 8, and the auxiliary heating device 10 can be directly disposed in the gap or can be sleeved on the heat exchange assemblies through the gap.

In the present embodiment, the compressor 5 is disposed between an outlet of the evaporator 8 and an inlet of the condenser 6, an exhaust pipe of the compressor 5 is communicated with the condenser 6 through a first pipeline 9, the heat pump system further includes a throttling device 7, two ends of the throttling device 7 are respectively communicated with the outlet of the condenser 6 and the inlet of the evaporator 8, the evaporator 8 is used for absorbing heat and vaporizing the refrigerant and sending the refrigerant to the compressor 5, the compressor 5 sends the vaporized refrigerant into high-pressure high-temperature gas to the condenser 6, the condenser 6 is used for releasing heat from the high-pressure high-temperature gas to heat air passing through the surface of the condenser 6, and the throttling device 7 is used for sending the high-pressure low-temperature refrigerant sent from the condenser 6 into low-pressure low-temperature refrigerant to the evaporator 8, so as to realize the recycling of the refrigerant.

Preferably, a first temperature sensor 12 is arranged on the exhaust pipe of the compressor 5, a second temperature sensor 13 is arranged at the outlet of the condenser 6, and a plurality of temperature sensors are arranged in the clothes drying equipment for monitoring the ambient temperature in real time, so that different operations can be performed when the ambient temperature reaches a preset value, and energy and time are saved.

In this embodiment, the air duct includes an air inlet duct 3 and an air outlet duct 2, an air outlet of the air inlet duct 3 is communicated with an air inlet of the clothes drying drum 1, an air inlet of the air outlet duct 2 is communicated with an air outlet of the clothes drying drum 1, the other ends of the air inlet duct 3 and the air outlet duct 2 are both communicated with a heat pump system, the evaporator 8 is disposed at a position close to the air outlet of the air outlet duct 2, the condenser 6 is disposed at a position close to an inlet of the air inlet duct 3, the air inlet duct 3 is used for delivering hot dry air into the clothes drying drum 1 so as to dry clothes in the clothes drying drum 1, when drying, moisture in the clothes is evaporated into water vapor, the water vapor and air in the clothes drying drum 1 are mixed into hot and humid air, the air outlet duct 2 is used for discharging the hot and humid air containing the water vapor from the clothes drying drum 1 after drying the clothes, so as to send into new hot and dry air through air inlet duct 3 and continuously dry to the clothing, air outlet duct 2 carries hot and humid air into heat pump system, and heat pump system handles hot and humid air, send into air inlet duct 3 after becoming hot and dry air, realizes this application air cycle among the clothing drying equipment, when air outlet duct 2 exhaust damp and hot gas passes through evaporimeter 8, the refrigerant heat absorption vaporization in the evaporimeter 8, the hot and humid air cooling of this moment, the vapor condensation who contains wherein discharges, becomes for microthermal dry air, and microthermal dry air absorbs the heat of refrigerant release wherein when condenser 6, thereby become hot and dry air by rapid heating, dry hot air carries out the clothing through air inlet duct 3 in sending into dry clothing cylinder 1 and dries.

Specifically, the clothes drying equipment further comprises a circulating fan 4, wherein the circulating fan 4 is arranged in the air inlet duct 3 and used for sending hot air passing through the heat pump system into the clothes drying roller 1, and the circulating fan 4 is used for sending hot and dry air into the clothes drying roller 1, so that air in the system is pushed to flow, and clothes are dried.

Preferably, a third temperature sensor 14 is disposed at the air inlet of the air outlet duct 2, the third temperature sensor 14 is also used for monitoring the ambient temperature, and is mainly used for detecting a time period when the user does not take out the clothes after the drying operation is completed, so as to perform different operations according to the monitoring result, it should be noted that a humidity sensor is further disposed at the position of the air inlet of the air outlet duct 2, and the humidity sensor is used for monitoring the drying degree of the clothes, so as to determine whether the drying operation is completed.

Specifically, the auxiliary heating device 10 is a ceramic PTC heater and/or an electric heating tube, at least one auxiliary heating device 10 is arranged in the gap of the condenser 6, the ceramic PTC heater and the electric heating tube have the characteristics of high heating speed and uniform heating, and can reach the target temperature quickly, and when more than two auxiliary heating devices 10 are arranged in the system, the auxiliary heating devices 10 can be ceramic PTC heaters or electric heating tubes, and can also be mixed use of the ceramic PTC heaters and the electric heating tubes.

In this embodiment, the heat exchange assembly is one or the combination of several kinds among copper aluminium heat exchanger, microchannel heat exchanger, aluminum pipe aluminium fin heat exchanger, the all-aluminium heat exchanger, the heat exchange assembly can be copper aluminium + copper aluminium, also can be copper aluminium + microchannel, also can be microchannel + microchannel, also can be the combination of aluminum pipe + aluminum pipe, aluminum pipe + aluminium fin, or several kinds of heat exchangers above, and the combination scheme of above heat exchanger all sets up according to the model, efficiency and the space size of equipment specifically in the protection scope of this application.

Example 2

The present embodiment provides a control method of a laundry drying apparatus, as shown in fig. 2, the control method includes the steps of:

s1: starting the clothes drying equipment;

s2: detecting the ambient temperature t₁Ambient temperature t to be detected₁And a first predetermined temperature T₁Making a comparison when t₁＜T₁When so, go to S3; when t is₁≥T₁When so, go to S4;

s3: starting the auxiliary heating device, and when the detected ambient temperature reaches the fourth preset temperature T₄Time-off auxiliary heating device, wherein T₄≥T₁；

S4: drying the clothes;

s5: prompting a user after drying is finished;

s6: after a first preset time M₁Then, the user takes out the clothes, and then the machine is turned off to finish the work; if the user does not take out the clothes, executing S7;

s7: detecting the ambient temperature t₁< second predetermined temperature T₂If yes, the circulating fan and the auxiliary heating device are started, otherwise, S6 is executed;

s8: running for a second preset time M₂And/or to a detection environmentTemperature t₁Not less than third preset temperature T₃Wherein T is₃＞T₂Closing the auxiliary heating device and the circulating fan;

s9: judging whether the time from the completion of the drying of the clothes to the current time reaches the preset total time length M₃If yes, shutting down the machine and finishing the work; otherwise, go to S6;

when the user takes out the clothes during the execution of any one of S6-S9, the operation is immediately finished and the machine is turned off.

According to the control method, the preset time length M can be obtained after the clothes drying equipment finishes drying work₃In the time period, if the interval M passes₁When the user does not take out the laundry, while detecting that the ambient temperature is lower than the second preset temperature T₂Then the circulating fan and the auxiliary heating device are started, specifically, the circulating fan is started first, then the auxiliary heating device is started to heat the clothes, and the operation interval time M is set₂And/or detecting that the ambient temperature is greater than a third preset temperature T₃And then, closing the circulating fan and the auxiliary heating device, and then judging whether the time length from the drying end to the current time does not reach the preset total time length M₃And in the execution process of any link from S6 to S9, as long as the user takes out the clothes, the operation is finished immediately, so that the clothes drying equipment is more humanized and energy-saving in use.

In addition, M is₃Can be set by a user, can be generally set to be 1-24 hours, and the ambient temperature t₁Is the temperature in the system pipeline or air duct, in particular, the ambient temperature t₁The second preset temperature T can be the detection result of any one of the first temperature sensor, the second temperature sensor and the third temperature sensor₂Or can be set by the customer, generally, T₂The method can be defined as three ranges of high temperature, medium temperature and low temperature, and specifically, the high temperature range is 45-75 ℃; the medium temperature range is: 30-45 ℃; the low temperature range is: less than 30 ℃, preferably, T₄> 15 ℃ as an embodiment of the invention, T₃＝T₂+T_xWherein, T_xIs a preset elevated temperature, specifically, 0<T_x<25℃。

It should be noted that all terms used in the present invention for directional and positional indication, such as: the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "lower", "head", "tail", "center", and the like are used only for explaining the relative positional relationship, connection, and the like between the respective members in a certain state, and are used only for convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a certain orientation, and thus, should not be construed as limiting the present invention. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.