阅读说明：本技术 一种空调水机 (Air conditioner water machine ) 是由 卢宪晓 贾庆磊 梁爱云 张建龙 白龙亮 刘凯 赵玉斌 宋振兴 于 2021-08-31 设计创作，主要内容包括：本发明公开一种空调水机,包括热泵机组、水循环系统、电控盒及散热装置；所述热泵机组与所述水循环系统连接；所述散热装置包括与所述电控盒固定连接的散热片、穿过所述散热片的水路及串联在所述水路上的温水阀；所述水路的两端分别与所述水循环系统连接；所述温水阀为可控开度电磁阀；所述电控盒包括控制器、电控盒温度传感器；所述电控盒温度传感器、所述温水阀分别与所述控制器连接；所述电控盒温度传感器检测电控盒温度并传输给所述控制器；所述控制器根据所述电控盒温度控制所述温水阀开度。本发明使处于极端环境下的电控盒满足工作条件,提高其工作可靠性及延长其寿命；另外,根据电控盒温度精确控制散热装置动作,降低其能耗,节约能源。(The invention discloses an air conditioner water machine, which comprises a heat pump unit, a water circulation system, an electric control box and a heat dissipation device, wherein the heat pump unit is connected with the water circulation system; the heat pump unit is connected with the water circulation system; the heat dissipation device comprises a heat dissipation fin fixedly connected with the electric control box, a water path penetrating through the heat dissipation fin and a warm water valve connected in series on the water path; the two ends of the water path are respectively connected with the water circulation system; the warm water valve is an electromagnetic valve with controllable opening; the electric control box comprises a controller and an electric control box temperature sensor; the temperature sensor of the electric control box and the warm water valve are respectively connected with the controller; the temperature sensor of the electric control box detects the temperature of the electric control box and transmits the temperature to the controller; the controller controls the opening of the warm water valve according to the temperature of the electric control box. The invention enables the electric control box in the extreme environment to meet the working condition, improves the working reliability and prolongs the service life of the electric control box; in addition, the action of the heat dissipation device is accurately controlled according to the temperature of the electric control box, so that the energy consumption is reduced, and the energy is saved.)

1. An air conditioner water machine is characterized by comprising a heat pump unit, a water circulation system, an electric control box and a heat dissipation device;

the heat pump unit is connected with the water circulation system and provides heat or cold for the water circulation system; the heat dissipation device comprises a heat dissipation fin fixedly connected with the electric control box, a water channel penetrating through the heat dissipation fin and a warm water valve connected in series on the water channel; the two ends of the water path are respectively connected with the water circulation system; the warm water valve is an electromagnetic valve with controllable opening;

the electric control box comprises a controller and an electric control box temperature sensor; the temperature sensor of the electric control box and the warm water valve are respectively connected with the controller; the electric control box temperature sensor is used for detecting the temperature of the electric control box and transmitting the temperature to the controller; the controller controls the opening of the warm water valve according to the temperature of the electric control box.

2. An air conditioning water machine according to claim 1, further comprising an ambient temperature sensor connected to the controller for sensing an ambient temperature and transmitting the sensed ambient temperature to the controller; when the heat pump unit is started, the controller controls whether the warm water valve is opened or not according to the ambient temperature.

3. The air conditioning water machine as claimed in claim 2, wherein the controller presets a first cooling temperature, a first heating temperature;

in the refrigeration mode, if the ambient temperature is higher than the first refrigeration temperature, the controller controls the warm water valve to be opened at a first opening degree;

in the heating mode, if the environment temperature is lower than the first heating temperature, the controller controls the warm water valve to be opened at a second opening degree;

the first opening degree is smaller than the second opening degree.

4. The air conditioner water machine according to claim 2 or 3, wherein the controller is preset with a second cooling temperature and a third cooling temperature;

in the refrigeration mode, if the temperature of the electric control box is higher than the second refrigeration temperature, the opening degree of the warm water valve is controlled by adopting a PID control method, and the control target is that the temperature of the electric control box is equal to the third refrigeration temperature;

if the temperature of the electric control box is between the second refrigeration temperature and the third refrigeration temperature, controlling the opening degree of the warm water valve by adopting a dew point superheat degree control method;

and if the temperature of the electric control box is lower than the third refrigerating temperature, controlling the warm water valve to be closed.

5. The air conditioner water machine as claimed in claim 4, wherein the controller is also preset with a second heating temperature and a third heating temperature;

in the heating mode, if the temperature of the electric control box is lower than the second heating temperature, the opening degree of the warm water valve is controlled by adopting a PID control method, and the control target is that the temperature of the electric control box is equal to the third heating temperature; the second heating temperature is less than the third heating temperature;

and if the temperature of the electric control box is higher than the second heating temperature, controlling the warm water valve to be closed.

6. The air conditioner according to claim 5, wherein the PID control method is performed by the following formula;

EV_n = EV_n-1+ [K₁*(Td_n-T)+K₂*(Td_n-Td_n-1)]

in the formula (I), the compound is shown in the specification,

EV_nis the target opening of the warm water valve;

EV_n-1the opening degree of the warm water valve in the last time;

K₁is a proportionality coefficient;

K₂is a differential coefficient;

Td_nis the current said electrical control box temperature;

Td_n-1is the last said electrical control box temperature;

and T is the third refrigerating temperature or the third heating temperature.

7. An air conditioning water machine according to claim 6, wherein the second cooling temperature is greater than 45 ℃; the third refrigeration temperature is less than or equal to 45 ℃; the third heating temperature is less than or equal to-20 ℃.

8. The air conditioner of claim 4, further comprising a humidity sensor connected to the controller for detecting ambient humidity and transmitting the detected ambient humidity to the controller; the dew point superheat degree control method comprises the following steps:

the controller calculates the wet bulb temperature according to the environment temperature and the environment humidity;

the controller calculates the dew point superheat degree according to the wet bulb temperature and the temperature of the electric control box;

a target dew point superheat threshold value is preset in the controller;

and the controller controls the opening degree of the warm water valve according to the dew point superheat degree and the dew point superheat degree threshold value.

9. The air conditioner according to claim 8,

EV when the dew point superheat degree is larger than the dew point superheat degree threshold value_n=EV_n-1+（SH-4）；

EV when the dew point superheat degree is less than the dew point superheat degree threshold value_n=EV_n-1-（4-SH）；

When the dew point superheat degree is within the dew point superheat degree threshold range, the opening degree of the warm water valve is kept unchanged;

in the formula, EV_nIs the target opening of the warm water valve;

EV_n-1the opening degree of the warm water valve in the last time;

SH is the dew point superheat.

10. The air conditioning water machine as claimed in claim 9, wherein the dew point superheat threshold is [3,5 ].

Technical Field

The invention relates to the technical field of air conditioning, in particular to an air conditioning water machine.

Background

With the continuous updating of the technology of the air source heat pump unit, the operation range of the unit is continuously expanded, for example, the ambient temperature under the refrigeration working condition is changed from 43 ℃ to 48 ℃, and can reach more than 52 ℃ under some T3 working conditions; the heating working condition is also reduced from the common-25 ℃ to-30 ℃ or even-35 ℃.

However, most of the electric components have the operating temperature range, for example, the surface temperature of the MCU is not allowed to exceed 60 ℃, and if the surface temperature exceeds 60 ℃, the operating life of the MCU is greatly reduced, and the reliability of the unit is influenced. Because the electric cabinet is for preventing rain, mostly be airtight box, when the ambient temperature is more than 50 ℃, because of the heat dissipation of electrical components, the temperature of electric cabinet inside exceedes its operating range upper limit very easily.

Because the lower limit of the operation range of a plurality of components is about minus 30 ℃, when the unit operates at low temperature, if the ambient temperature is minus 30 ℃ or below, the problems of slow action of an electromagnetic switch, incomplete battery discharge, incapability of normal work of a chip and the like can occur, so that the failure rate of the air source heat pump unit is increased.

With the improvement of technologies such as air supply and enthalpy increase, control logic and the like of a compressor, the operation range of an air source heat pump unit is greatly expanded, but the temperature resistance problem of an electrical component is not taken into consideration deeply, and only a conventional heat dissipation mode is simply adopted, so that the problems of low heat dissipation efficiency or circuit failure and the like caused by condensate water are caused; or the common components are replaced by the high-temperature resistant and low-temperature resistant components, so that the cost is greatly increased.

Disclosure of Invention

In order to solve the problems of poor reliability and short service life of an electric control box of an air conditioner under extreme working conditions in the prior art, the invention provides the air conditioner water machine.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an air conditioner water machine, which comprises a heat pump unit, a water circulation system, an electric control box and a heat dissipation device, wherein the heat pump unit is connected with the water circulation system;

the heat pump unit is connected with the water circulation system and provides heat or cold for the water circulation system; the heat dissipation device comprises a heat dissipation fin fixedly connected with the electric control box, a water channel penetrating through the heat dissipation fin and a warm water valve connected in series on the water channel; the two ends of the water path are respectively connected with the water circulation system; the warm water valve is an electromagnetic valve with controllable opening;

the electric control box comprises a controller and an electric control box temperature sensor; the temperature sensor of the electric control box and the warm water valve are respectively connected with the controller; the electric control box temperature sensor is used for detecting the temperature of the electric control box and transmitting the temperature to the controller; the controller controls the opening of the warm water valve according to the temperature of the electric control box.

In one embodiment, the system further comprises an ambient temperature sensor connected with the controller and used for detecting the ambient temperature and transmitting the ambient temperature to the controller; when the heat pump unit is started, the controller controls whether the warm water valve is opened or not according to the ambient temperature.

In one embodiment, the controller presets a first cooling temperature and a first heating temperature;

in the refrigeration mode, if the ambient temperature is higher than the first refrigeration temperature, the controller controls the warm water valve to be opened at a first opening degree;

in the heating mode, if the environment temperature is lower than the first heating temperature, the controller controls the warm water valve to be opened at a second opening degree;

the first opening degree is smaller than the second opening degree.

In some embodiments, the controller is preset with a second refrigeration temperature and a third refrigeration temperature;

in the refrigeration mode, if the temperature of the electric control box is higher than the second refrigeration temperature, the opening degree of the warm water valve is controlled by adopting a PID control method, and the control target is that the temperature of the electric control box is equal to the third refrigeration temperature;

if the temperature of the electric control box is between the second refrigeration temperature and the third refrigeration temperature, controlling the opening degree of the warm water valve by adopting a dew point superheat degree control method;

and if the temperature of the electric control box is lower than the third refrigerating temperature, controlling the warm water valve to be closed.

In some embodiments, the controller is also preset with a second heating temperature and a third heating temperature;

in the heating mode, if the temperature of the electric control box is lower than the second heating temperature, the opening degree of the warm water valve is controlled by adopting a PID control method, and the control target is that the temperature of the electric control box is equal to the third heating temperature; the second heating temperature is less than the third heating temperature;

and if the temperature of the electric control box is higher than the second heating temperature, controlling the warm water valve to be closed.

In some embodiments, the PID control method is performed by the following formula;

EV_n = EV_n-1+ [K₁*(Td_n-T)+K₂*(Td_n-Td_n-1)]

in the formula (I), the compound is shown in the specification,

EV_nis the target opening of the warm water valve;

EV_n-1the opening degree of the warm water valve in the last time;

K₁is a proportionality coefficient;

K₂is a differential coefficient;

Td_nis the current said electrical control box temperature;

Td_n-1is the last said electrical control box temperature;

and T is the third refrigerating temperature or the third heating temperature.

In some embodiments, the second refrigeration temperature is greater than 45 ℃; the third refrigeration temperature is less than or equal to 45 ℃; the third heating temperature is less than or equal to-20 ℃.

In some embodiments, the humidity sensor is connected with the controller and used for detecting the ambient humidity and transmitting the ambient humidity to the controller; the dew point superheat degree control method comprises the following steps:

the controller calculates the wet bulb temperature according to the environment temperature and the environment humidity;

the controller calculates the dew point superheat degree according to the wet bulb temperature and the temperature of the electric control box;

a target dew point superheat threshold value is preset in the controller;

and the controller controls the opening degree of the warm water valve according to the dew point superheat degree and the dew point superheat degree threshold value.

In some embodiments, EV is determined when the dew point superheat is greater than the dew point superheat threshold_n=EV_n-1+（SH-4）；

EV when the dew point superheat degree is less than the dew point superheat degree threshold value_n=EV_n-1-（4-SH）；

When the dew point superheat degree is within the dew point superheat degree threshold range, the opening degree of the warm water valve is kept unchanged;

in the formula, EV_nIs the target opening of the warm water valve;

EV_n-1the opening degree of the warm water valve in the last time;

SH is the dew point superheat.

In some embodiments, the dew point superheat threshold is [3,5 ].

Compared with the prior art, the technical scheme of the invention has the following technical effects:

according to the air conditioner water machine, the electric control box is cooled or heated through the water circulating system, so that the electric control box of the air conditioner water machine in an extreme environment meets the temperature working condition, the working reliability of the electric control box is improved, the service life of electronic elements of the electric control box is prolonged, and the service life of the electric control box is further prolonged; in addition, the opening of the warm water valve is controlled according to the temperature of the electric control box, the cooling or heating of the electric control box by the heat dissipation device is accurately controlled, the energy consumption of the heat dissipation device is reduced, and the energy is saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of an air conditioning water machine according to the present invention;

fig. 2 is a flow chart of an embodiment of an air conditioning water machine according to the present invention.

Reference numerals:

1. a heat pump unit; 2. a water circulation system; 3. a heat sink; 4. an electronic control box; 5. an electronic control box temperature sensor; 6. a humidity sensor; 7. an ambient temperature sensor; 31. a heat sink; 32. a waterway; 33. a warm water valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 and 2, the air conditioner water machine of the present invention includes a heat pump unit 1, a water circulation system 2, a heat dissipation device 3, and an electric control box 4.

The heat pump unit 1 is connected with the water circulation system 2 and used for providing heat or cold for the water circulation system 2, and the water circulation system 2 carries the heat or cold to cool or heat up the indoor environment, so that indoor heating or cooling is realized.

The heat sink 3 comprises a heat sink 31, a water path 32 passing through the heat sink 31, and a warm water valve 33 connected in series in the water path 32; the radiating fin 31 is fixedly connected with the electric control box 4; the water path 32 is communicated with the water circulation system 2; the warm water valve 33 is an electromagnetic valve with controllable opening, and is used for controlling the amount of circulating water of the water circulation system 2 to flow through the water path 32 for heat dissipation or temperature rise of the electronic control box 4.

The electric control box 4 comprises a controller and an electric control box temperature sensor 5; the temperature sensor 5 of the electric control box and the warm water valve 33 are respectively connected with the controller; the electric control box temperature sensor 5 is used for detecting the temperature of the electric control box and transmitting the temperature to the controller; the controller controls the opening degree of the warm water valve 33 according to the temperature of the electric control box, so that the temperature in the electric control box 4 is kept within a proper working range.

The air-conditioning water machine of the invention cools or heats the electric control box 4 by the circulating water of the water circulating system 2, so that the electric control box 4 of the air-conditioning water machine in extreme environment meets the temperature working condition, the working reliability is improved, the service life of the electronic element of the electric control box 4 is prolonged, and the service life of the electric control box 4 is further prolonged; in addition, the opening degree of the warm water valve 33 is controlled according to the temperature of the electric control box, the cooling or heating of the electric control box 4 by the heat dissipation device 3 is accurately controlled, the energy consumption of the heat dissipation device 3 is reduced, and energy is saved.

In one embodiment, referring to fig. 1 and 2, an ambient temperature sensor 7 is further included, and is connected to the controller, and is configured to detect an ambient temperature and transmit the detected ambient temperature to the controller.

The controller is preset with a first refrigerating temperature and a first heating temperature; and when the heat pump unit 1 is started and the compressor of the heat pump unit 1 is started, the controller judges the relationship between the ambient temperature and the first refrigerating temperature or the first heating temperature.

When the air conditioner water machine operates in a refrigeration mode, the controller judges whether the ambient temperature is greater than a first refrigeration temperature; if the ambient temperature is higher than the first refrigeration temperature, controlling the warm water valve 33 to be opened at a first opening degree; if the ambient temperature is not greater than the first cooling temperature, the warm water valve 33 is controlled to be closed, and when the warm water valve 33 is closed, the ambient temperature is subjected to cycle judgment.

When the air conditioner water machine is in heating operation, the controller judges whether the ambient temperature is lower than a first heating temperature; if the ambient temperature is lower than the first heating temperature, controlling the warm water valve 33 to be opened at a second opening degree; if the ambient temperature is not less than the first heating temperature, the warm water valve 33 is controlled to be closed, and when the warm water valve 33 is closed, the ambient temperature is judged cyclically.

The first opening degree is smaller than the second opening degree.

The air-conditioning water machine of the embodiment controls whether the warm water valve 33 is opened or not according to the ambient temperature, so that the warm water valve 33 is not opened when the ambient temperature and the heat exchange of the electric control box 4 are enough to heat or cool the electric control box 4 to meet the working temperature, the opening of the warm water valve 33 is reduced while the working temperature of the electric control box 4 is ensured, the service life of the warm water valve 33 is prolonged, and energy is saved.

In addition, if the warm water valve 33 is opened during refrigeration, the warm water valve is opened at a first opening degree; when heating, if the warm water valve 33 is opened, the warm water valve is opened at a second opening degree; the first opening degree is smaller than the second opening degree, so that the probability of condensed water generated by sudden and large cooling of the electronic control box 4 during refrigeration is reduced; the larger second opening degree allows the electronic control box 4 to quickly reach the target temperature when the temperature rises.

Preferably, the first refrigeration temperature is in the range of 41 ℃ to 45 ℃. The first heating temperature is in the range of minus 20 ℃ to minus 25 ℃.

Preferably, the ambient temperature is continuously measured and determined, and when the ambient temperature continuously obtained by the controller for multiple times is greater than the first cooling temperature or less than the first heating temperature, the warm water valve 33 is controlled to be opened.

Preferably, the first opening degree is smaller than half of the maximum opening degree of the warm water valve 33; the second opening degree is an opening degree that is greater than or equal to half of the maximum opening degree of the warm water valve 33.

In some embodiments, referring to fig. 1 and 2, the controller is preset with a second cooling temperature, a third cooling temperature, a second heating temperature, and a third heating temperature;

when the refrigeration mode is operated and the warm water valve 33 is opened, the controller judges the temperature of the electric control box; if the temperature of the electric control box is higher than the second refrigeration temperature, the opening degree of the warm water valve 33 is controlled by adopting a PID control method, and the control target is to enable the temperature of the electric control box to be equal to the third refrigeration temperature.

And if the temperature of the electric control box is between the second refrigeration temperature and the third refrigeration temperature, controlling the opening degree of the warm water valve 33 by adopting a dew point superheat degree control method.

And if the temperature of the electric control box is lower than the third refrigerating temperature, the warm water valve 33 is controlled to be closed.

When the heating mode is operated and the warm water valve 33 is opened, the controller judges the temperature of the electric control box; if the temperature of the electric control box is lower than the second heating temperature, the opening degree of the warm water valve 33 is controlled by adopting a PID control method, and the control target is to ensure that the temperature of the electric control box is equal to the third heating temperature; the second heating temperature is less than the third heating temperature.

And if the temperature of the electric control box is higher than the second heating temperature, the warm water valve 33 is controlled to be closed.

When the air conditioning water machine of the embodiment is used for refrigerating, different control methods are adopted to control the opening degree of the warm water valve 33 according to the temperature of the electric control box. When the temperature of the electric control box is very high and even reaches the limit working temperature of the electric control box 4, the opening of the warm water valve 33 is controlled by adopting a PID control method, so that the temperature of the electric control box quickly reaches the third refrigeration temperature, the proper working temperature of the electric control box 4 is met, and the electric control box 4 and electronic elements thereof are protected.

When the temperature of the electric control box is higher, a dew point superheat degree control method is adopted, condensation generated in the electric control box 4 is prevented and reduced, the working reliability of the electric control box 4 is improved, and the service life of the electric control box 4 is prolonged.

In some embodiments, the specific PID control method is performed by the following formula;

EV_n = EV_n-1+ [K₁*(Td_n-T)+K₂*(Td_n-Td_n-1)]

in the formula (I), the compound is shown in the specification,

EV_nis the target opening degree of the warm water valve 33;

EV_n-1the opening degree of the warm water valve 33 at the previous time;

K₁is a proportionality coefficient, preferably 1.6;

K₂is a differential coefficient, preferably 0.8;

Td_nis the current electronic control box temperature;

Td_n-1is the last electrical control box temperature;

t is the third cooling temperature or the third heating temperature.

In the embodiment, the opening degree of the warm water valve 33 is controlled by adopting a PID control method, so that the opening degree of the warm water valve 33 and the temperature of the electric control box are both in a stable regulation state, the condition that the opening degree of the warm water valve 33 and the temperature of the electric control box are greatly jumped is prevented, and electronic elements in the warm water valve 33 and the electric control box 4 are protected.

Preferably, the second refrigeration temperature is greater than 45 ℃; the third refrigeration temperature is less than or equal to 45 ℃; the third heating temperature is less than or equal to-20 ℃.

Preferably, when the air-conditioning water machine is operated in a heating mode, the controller circularly judges whether the ambient temperature is less than 0 ℃; if so, the warm water valve 33 is controlled to be opened and operated for a predetermined time to prevent the heat sink 3 from being frozen.

In some embodiments, the water conditioner further comprises a humidity sensor 6 connected with the controller for detecting the ambient humidity and transmitting the ambient humidity to the controller; the controller calculates the wet bulb temperature according to the environment temperature and the environment humidity and is used for controlling the dew point superheat degree.

The dew point superheat degree control method further comprises the following steps.

The controller presets a dew point superheat threshold; the controller calculates the wet bulb temperature according to the environment temperature and the environment humidity; the controller calculates the dew point superheat degree according to the temperature of the electric control box and the temperature of the wet bulb.

The controller judges the dew point superheat degree and the dew point superheat degree threshold value and controls the opening degree of the warm water valve 33 according to the judgment result.

In particular to a method for preparing a high-performance nano-silver alloy,

when the dew point superheat degree is larger than the dew point superheat degree threshold value, the EV_n=EV_n-1+（SH-4）；

When the dew point superheat degree is smaller than the dew point superheat degree threshold value, the EV_n=EV_n-1-（4-SH）；

When the dew point superheat degree is within the dew point superheat degree threshold range, the opening degree of the warm water valve 33 is kept unchanged;

in the formula, EV_nIs the target opening degree of the warm water valve 33;

EV_n-1the opening degree of the warm water valve 33 at the previous time;

SH is the dew point superheat.

The air conditioner water machine of the embodiment reduces condensation while reducing the temperature of the electric control box.

Preferably, the dew point superheat threshold is [3,5 ].

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.