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This patent application claims priority to the Chinese patent application
CN202310360751.3 filed on April 6, 2023 , and entitled "Heat-Pump Dishwasher", the entire disclosure of which is incorporated herein by reference.
TECHNICAL FIELD
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The present invention relates to the technical field of washing apparatus and specifically provides a dishwasher with a heat-pump device.
BACKGROUND OF THE INVENTION
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The heat-pump system of a dishwasher typically comprises multiple components. In existing dishwashers, these components are usually installed separately within the dishwasher. When installation or removal of any heat-pump system component is required, operators work inside the dishwasher. However, due to the limited space inside the dishwasher, operators may encounter interference from other parts or internal frame structures during operation, which increases the difficulty of assembly or maintenance and raises maintenance costs.
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Accordingly, there is a need in the art for a new dishwasher including a heat-pump device to address the above problems.
SUMMARY OF THE INVENTION
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The present invention is directed to addressing the foregoing technical problem, namely, the issue that in existing dishwashers, the individual components of the heat-pump system are arranged separately, making installation and removal inconvenient for operation.
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In one aspect, the present invention provides a dishwasher comprising a heat-pump device. The heat-pump device comprises a mounting plate and functional components. The mounting plate is detachably arranged inside the dishwasher, and the functional components are arranged on the mounting plate such that, when the mounting plate is moved to the outside of the dishwasher, the functional components are able to be moved to the outside of the dishwasher together with the mounting plate.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the dishwasher comprises a base, and the mounting plate is detachably arranged on the base.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the dishwasher further comprises a base front cover, which is detachably arranged on the base, such that the mounting plate can be moved to the exterior of the base after being detached from the base.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the functional components comprise a compressor, a condenser, a fan, and an evaporator. The condenser, the fan, and the evaporator are sequentially arranged on the mounting plate in a front-to-rear direction, and the compressor is arranged at a side of the fan and the evaporator.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the mounting plate is provided with a first mounting hole for connecting the mounting plate to the dishwasher, and a second mounting hole for connecting the functional components to the mounting plate.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, power lines and control lines are arranged between the functional components and a body of the dishwasher, and lengths of the power lines and/or the control lines are set to be sufficient to allow the mounting plate together with the functional components to be moved out of the dishwasher.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the dishwasher further comprises a lower trim, which is positioned at the lower front side of the heat-pump dishwasher and comprises a first air-guiding structure arranged vertically and a second air-guiding structure arranged horizontally. The first air-guiding structure and the second air-guiding structure are fixedly connected or integrally formed. The first air-guiding structure divides an air inlet of the heat-pump dishwasher into a first air vent and a second air vent. Air is able to be blown in from the first air vent, pass into the interior of the heat-pump dishwasher after flowing through one side of the second air-guiding structure, and then be blown out from the second air vent after passing through the other side of the second air-guiding structure in a direction opposite to a blowing-in direction of the air.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the first air vent is located above the second air vent, and the first air vent is adjacent to a top surface of the second air-guiding structure, allowing air to be blown in along the top surface of the second air-guiding structure. The second air vent is adjacent to a bottom surface of the second air-guiding structure, allowing the air to be blown out along the bottom surface of the second air-guiding structure.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the dishwasher further comprises a base and a housing. The second air-guiding structure is fixedly connected to the front sidewall of the base, and a first ventilation hole is provided on the second air-guiding structure. A second ventilation hole is provided on the front sidewall of the base. Air can enter the interior of the base through the first and second ventilation holes. A first passage is formed between a bottom surface of the base and a bottom surface of the housing, as well as a rear side surface of the housing. A second passage is formed between the bottom surface of the housing and bottom surfaces of the first and second air-guiding structures. The second passage communicates with the first passage, so that the air entering the interior of the base can pass through the first and second passages in sequence and be blown out from the second air vent.
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In a specific embodiment of the dishwasher comprising a heat-pump device as described above, the second air-guiding structure comprises a curved section and a straight section. The second air-guiding structure is connected to the front sidewall of the base at the straight section and is connected to the first air-guiding structure at the curved section. The curved section has a downwardly concave shape, and the first ventilation hole is arranged on the straight section.
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Under the above technical scheme, the present invention facilitates removal and maintenance of the heat-pump device. Specifically, by providing a mounting plate in the heat-pump device and integrally installing the functional components of the heat-pump device on the mounting plate, the heat-pump device is made more integrated. During installation of the heat-pump device into the dishwasher, the functional components of the heat-pump device can first be mounted on the mounting plate outside the dishwasher, and then the heat-pump device as an integral unit can be placed into the interior of the dishwasher for fixed installation. This avoids the inconvenience of separately installing multiple functional components inside the dishwasher where limited internal space complicates operations. Similarly, when a functional component of the heat-pump device requires maintenance or replacement, it is only necessary to remove the mounting plate from the interior of the dishwasher and then pull the entire heat-pump device out of the dishwasher, without performing operations inside the dishwasher and thus avoiding interference among components.
BRIEF DESCRIPTION OF THE DRAWINGS
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The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
- FIG. 1 is an axonometric view of the overall structure of the dishwasher of the present invention with the lower trim removed;
- FIG. 2 is an axonometric view of the base and lower trim portion of the dishwasher according to the present invention;
- FIG. 3 is a right view of the base and lower trim portion of the dishwasher according to the present invention;
- FIG. 4 is a structural schematic view of the second ventilation hole on the inner side of the base;
- FIG. 5 is a cross-sectional view of the connection between the first air-guiding structure and the support structure, taken along the line C-C in FIG. 2;
- FIG. 6 is a structural schematic view of the connection between the second air-guiding structure and the base;
- FIG. 7 is an enlarged partial view of the connection between the second air-guiding structure and the base, specifically showing section A in FIG. 6;
- FIG. 8 is a bottom view of the base and lower trim;
- FIG. 9 is an enlarged partial view of the connection between the second air-guiding structure and the support structure, specifically showing section B in FIG. 8;
- FIG. 10 is a structural schematic view of the hea- pump device after being removed from the dishwasher;
- FIG. 11 is a front view of the overall structure of the dishwasher after removing the base front cover;
- FIG. 12 is an enlarged partial view of the heat-pump device, specifically showing the section D in FIG. 11;
- FIG. 13 is a structural schematic view of the condenser bracket;
- FIG. 14 is a structural schematic view of the first mounting hole and the second mounting hole on the mounting plate;
- FIG. 15 is a schematic view showing the positions of the evaporator, condenser, fan, and compressor;
- FIG. 16 is a schematic view illustrating the structure of the connection between the condenser and the inlet and outlet water pipes.
List of reference signs:
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- 1-Dishwasher;
- 11-Lower trim;
- 111-First air-guiding structure; 1111-First snap-fit groove;
- 112-Second air-guiding structure; 1121-First ventilation hole; 1122-Curved section; 1123-Straight section; 1124-Snap-fit hole; 1125-Guiding protrusion; 1126-Reverse buckle; 1127-Snap-fit platform;
- 113-Support structure; 1131-First snap-fit protrusion; 1132-Second snap-fit protrusion; 1133-Support leg; 1134-Third snap-fit protrusion;
- 12-First air vent;
- 13-Housing; 131-First passage; 132-Second passage;
- 14-Base; 141-Second ventilation hole; 142-Guiding slot; 143-Second snap-fit groove; 144-Base front cover;
- 15-Second air vent;
- 16-Heat-pump device; 161-Mounting plate; 1611-First mounting hole; 1612-Second mounting hole; 162-Condenser; 1621-Inflow water pipe; 1622-Outflow water pipe; 163-Condenser bracket; 1631-Support groove; 1632-Wire winding groove; 164-Equipment connecting wires; 165-Compressor; 166-Fan; 167-Evaporator.
DETAILED DESCRIPTION OF THE INVENTION
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Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these following embodiments are only used to explain the technical principle of the present invention and are not intended to limit the scope of protection of the present invention. These embodiments can be adjusted by those skilled in the art as needed to adapt to specific application scenes. For example, although the description describes the condenser and condenser bracket as examples, it is apparent that the heat pump device for dishwashers of the present invention also comprises other functional components, such as an evaporator.
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It should be noted that in the description of the present invention, terms indicating directional or positional relationships, such as "upper", "lower", "left", "right", "inner", and "outer", are based on the directional or positional relationships shown in the accompanying drawings. They are only used for ease of description, and do not indicate or imply that the device or element must have a specific orientation or must be constructed or operated in a specific orientation; therefore, they should not be considered as limitations to the present invention. In addition, ordinal terms "first", "second", "third" etc., are only used for descriptive purpose, and should not be understood as indicating or implying relative importance.
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In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, terms "mounting", "communicate with" and "connect" should be understood in a broad sense; for example, the connection may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection; it may be a direct connection, or an indirect connection implemented through an intermediate medium, or an internal connection between two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be interpreted according to specific situations.
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The heat pump device of a dishwasher typically comprises multiple functional components. In existing dishwashers, these components are usually installed separately within the dishwasher. When it comes to installing or dismantling these functional components, operators need to work inside the dishwasher. However, due to the limited space inside the dishwasher, operators may be interfered with by other functional components or the internal frame structure of the dishwasher during their operations, which increases the difficulty of their work and also raises the maintenance cost of the apparatus. Therefore, the present invention proposes a new dishwasher comprising a heat pump device to address the aforementioned issue of inconvenient maintenance in existing dishwashers.
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As shown in FIG. 1, 11, and 16, to solve the problem that the various functional components in the heat-pump device 16 of the existing dishwasher 1 are separately arranged, requiring individual operations during installation and removal, and that when it is necessary to install or repair the functional components inside the dishwasher 1, all the functional components that interfere with maintenance need to be removed one by one, which is inconvenient for operation. The dishwasher 1 of the present invention is provided with a base front cover 144 on the front of the base 14. The base front cover 144 and the front of the base 14 are accordingly provided with mounting holes that are internally threaded, and the base front cover 144 and the base 14 can be detachably connected via screws and the mounting holes.
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As shown in FIG. 1, 10 to 14, after the base front cover 144 is removed, a heat-pump device 16 is visible inside the base 14. The heat-pump device 16 comprises a mounting plate 161provided with a first mounting hole 1611 for attaching the mounting plate to the dishwasher 1 and a second mounting hole 1612 for mounting the functional components inside the dishwasher 1 to the mounting plate 161. Corresponding mounting holes (not shown) for installation are provided on the base 14 of the dishwasher 1 and on the functional components of the dishwasher 1. The mounting plate 161 is provided with a condenser 162 and a condenser bracket 163. The condenser 162 is detachably mounted on the condenser bracket 163, and the condenser bracket 163 is detachably mounted on the mounting plate 161. The condenser 162 comprises an inflow water pipe 1621 and an outflow water pipe 1622. Equipment connecting wires 164, such as power lines and control lines, are arranged between the functional components and the body of the dishwasher 1. The lengths of the power lines and control lines are set to allow the mounting plate 161 together with the functional components to be moved out of the dishwasher 1.
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In the case of adopting the aforementioned embodiment, when it is necessary to install the functional components (such as the condenser 162 and the condenser bracket 163) of the heat-pump device 16 of the dishwasher 1 into the dishwasher 1, an operator may first remove the screws that fixedly connect the base front cover 144 to the base 14, detach the base front cover 144 from the base 14, then detach the mounting plate 161 from the base 14 and move it to the exterior of the dishwasher 1, install the condenser 162 onto the condenser bracket 163, and subsequently install the condenser bracket 163 and the condenser 162 together onto the mounting plate 161 through the second mounting hole 1612. After the installation is completed, the mounting plate 16 is moved back into the interior of the dishwasher 1 and fixed to the base 14 of the dishwasher 1 through the first mounting hole 1611, thereby achieving the installation of the functional components. Finally, the base front cover 144 is reinstalled onto the front of the base 14. When there is a problem with the functional components inside the dishwasher 1 that requires repair or replacement, simply repeat the above steps, which will not be elaborated further here. Additionally, it should be noted that, as shown in FIG. 16, when moving the heat-pump device 16 to the exterior of the dishwasher 1, the base front cover 144 can be removed first, then the heat pump device 16 can be moved to the exterior of the dishwasher, and after that, the condenser 162, the inflow water pipe 1621, and the outflow water pipe 1622 are removed correspondingly. When reinstalling, the condenser 162 can be returned to the interior of the dishwasher 1 and be mounted and connected to the inflow water pipe 1621 and the outflow water pipe 1622, and finally the base front cover 144 is reinstalled on the base 14.
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The advantage of the aforementioned embodiment lies in that, by integrating the functional components of the heat-pump device 16 onto a single mounting plate 161, which can be moved to the exterior of the dishwasher 1, operators can install and remove functional components from the exterior of the dishwasher 1. This addresses the issue in existing dishwashers 1 in which various components of the heat pump device 16 are separately arranged, requiring individual operations during installation and removal. When the functional components within the dishwasher 1 need to be installed or repaired, all components that interfere with maintenance need to be removed one by one, making the operation inconvenient. Additionally, regarding the placement of the first mounting hole 1611 and the second mounting hole 1612 on the mounting plate 161, as shown in FIG. 14, the first mounting hole 1611, which is used for securing to the dishwasher 1, is positioned at the periphery away from the second mounting hole 1612 for installing functional components. This allows operators to have sufficient operating space when removing the mounting plate 161 from the interior of the dishwasher 1, preventing interference on the operators from functional components on the mounting plate 161. Furthermore, by setting lengths of the equipment connecting wires 164 of the heat-pump device 16 to allow the mounting plate 161 and the functional components to be moved out of the dishwasher 1. When maintenance is required, the mounting plate 161 can be removed from the dishwasher 1 and the heat-pump device 16 can be moved to the exterior of the dishwasher 1 without removing the equipment connecting wires 164, further reducing the workload of operators.
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Having introduced the main embodiments of the present invention as described above, the following will introduce additional preferred embodiments of the present invention.
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As shown in FIG. 2-4, in one possible embodiment, the lower trim 11 of the dishwasher 1 is arranged at the lower front side of the dishwasher 1. The lower trim 11 comprises a first air-guiding structure 111 arranged vertically and a second air-guiding structure 112 arranged horizontally, which are fixedly connected. As shown in FIG. 2, the first air-guiding structure 111 divides the air inlet of the dishwasher 1 into a first air vent 12 above and a second air vent 15 below (the direction of the arrow represents the direction of air flow). Air can be blown in from the first air vent 12 which is adjacent to a top surface of the second air-guiding structure 112 so that air can be blown in along the top surface of the second air-guiding structure 112. The second air-guiding structure 112 comprises a curved section 1122 and a straight section 1123. The curved section 1122 has a downwardly concave shape. The dishwasher 1 further comprises a base 14. The second air-guiding structure 112 is connected to the front sidewall of the base 14 at the straight section 1123 and is connected to the first air-guiding structure 111 at the curved section 1122. The second air-guiding structure 112 is provided with a first ventilation hole 1121 which is provided on the straight section 1123. External air flows to the front sidewall of the base 14 after passing through the first ventilation hole 1121 of the second air-guiding structure 112. The front sidewall of the base 14 is provided with a second ventilation hole 141, through which air can enter the interior of the base 14. A first passage 131 is formed between the bottom surface of the base 14 and the bottom surface of the housing 13 and the rear side surface of the housing 13, and a second passage 132 is formed between the bottom surface of the housing 13 and the bottom surfaces of the first air-guiding structure 111 and the second air-guiding structure 112. The second passage 132 communicates with the first passage 131. Air entering the interior of the base 14 can be blown to the second air vent 15 through the first passage 131 and the second passage 132 in sequence and then blown out of the dishwasher 1 from the second air vent 15.
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The advantage of the above embodiment lies in the fact that by dividing the air inlet of the dishwasher 1 into two air vents, namely the first and second air vents, and by utilizing the first passage 131 enclosed by the base 14 and the housing 13 of the dishwasher 1, as well as the second passage 132 enclosed by the housing 13, the first air-guiding structure 111, and the second air-guiding structure 112, an air circulation arrangement is achieved where the air inlet side and the air outlet side are on the same side of the dishwasher 1. This avoids locating the exhaust outlet inside a cabinet, which in conventional air-source dishwashers-commonly recessed into cabinets-results in exhaust openings being very close to the cabinet interior where surrounding air cannot circulate freely, thus reducing heat-pump heat-exchange efficiency. Additionally, the fixed connection of the first air-guiding structure 111 and the second air-guiding structure 112 facilitates the overall disassembly of parts, thereby facilitating the later maintenance of the dishwasher 1.
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Furthermore, regarding the connection manner between the first air-guiding structure 111 and the second air-guiding structure 112, those skilled in the art will understand that although it is mentioned above that the first air-guiding structure 111 and the second air-guiding structure 112 are fixedly connected, this is not the only connection manner in the present invention. Those skilled in the art can also configure the first air-guiding structure 111 and the second air-guiding structure 112 in an integrally formed manner. The integrally formed manner enhances the connection strength between the first air-guiding structure 111 and the second air-guiding structure 112, thereby improving the structural stability of the lower trim 11. Simultaneously, the integrally formed manner also reduces the number of parts and mold cost.
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Furthermore, regarding the number of the first ventilation hole 1121 and the second ventilation hole 141, those skilled in the art will appreciate that either the first ventilation hole 1121 or the second ventilation hole 141 may be provided as a single hole or as multiple holes, or one of them may be provided as multiple holes. These situations can be selected by those skilled in the art according to actual requirements. However, regardless of the form adopted, as long as ventilation holes for introducing external air into the interior of the dishwasher 1 are provided on the first air-guiding structure 111 and the second air-guiding structure 112, it does not deviate from the inventive principle of the present invention and thus will fall within the scope of the present invention.
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In addition, regarding the bending direction of the curved section 1122 of the second air-guiding structure 112, those skilled in the art can understand that the curved section 1122 of the second air-guiding structure 112 can be designed to either concave downward or be configured as a smooth inclined surface, as long as it does not hinder the airflow directed towards the first ventilation hole 1121. Those skilled in the art can make such configurations according to actual situations, and all these variations fall within the scope of the present invention.
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As shown in FIG. 3 and 15, in one possible embodiment, the functional components comprise a compressor 165, a condenser 162, a fan 166, and an evaporator 167. The condenser 162, the fan 166, and the evaporator 167 are sequentially arranged in the front-to-rear direction on a mounting plate 161. The compressor 165 is arranged on one side of the fan 166 and the evaporator 167. The fan 166 is configured to allow air to enter from the first air vent 12 and flow out from the second air vent 15.
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The advantage of the aforementioned embodiment lies in that by installing a fan 166 on the base 14 of the dishwasher 1, the flow direction of air entering the interior of the dishwasher 1 can be controlled. This allows air to be blown in from the first air vent 12 located above and blown out from the second air vent 15 located below. Since the heat pump needs to extract heat from high-temperature external air for heat exchange, and the relatively hotter air tends to be located above the cooler air, this arrangement maximizes the intake of high-temperature external air into the interior of the dishwasher 1 for heat exchange. Simultaneously, the cooler air, after heat exchange, is discharged from the second air vent 15 located below, allowing the cooler air to accumulate below. This arrangement reduces mixing of low-temperature air with the upper high-temperature air and thus improves heat-pump heat-exchange efficiency.
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As shown in FIG. 2, 3, 5, 8, and 9, in one possible embodiment, the lower trim 11 further comprises a support structure 113. The support structure 113 is provided with a first snap-fit protrusion 1131 and a second snap-fit protrusion 1132. Correspondingly, the second air-guiding structure 112 is provided with a snap-fit hole 1124 and the first air-guiding structure 111 is provided with a first snap-fit groove 1111. The first snap-fit protrusion 1131 can be snapped into the first snap-fit groove 1111, and the second snap-fit protrusion 1132 can be snapped into the snap-fit hole 1124, to achieve the connection between the support structure 113 and the first and second air-guiding structures 111 and 112. The support structure 113 is also provided with a third snap-fit protrusion 1134, and correspondingly, the second air-guiding structure 112 is provided with a snap-fit platform 1127. The third snap-fit protrusion 1134 can be snapped onto the snap-fit platform 1127. The support structure 113 further comprises support legs 1133, and the support structure 113 is supported on the bottom surface of the housing 13 by the support legs 1133.
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The advantage of the aforementioned embodiment lies in that by providing the support structure 113 and achieving fixation of the first air-guiding structure 111 and the second air-guiding structure 112 with the support structure 113 via cooperations of the first snap-fit groove 1111 and the first snap-fit protrusion 1131, the snap-fit hole 1124 and the second snap-fit protrusion 1132, as well as the snap-fit platform 1127 and the third snap-fit protrusion 1134, the first air-guiding structure 111 and the second air-guiding structure 112 are made more stable, ensuring normal air circulation in the dishwasher 1. Additionally, by providing support legs 1133 on the support structure 113, a second passage 132 with a certain space is formed between the first air-guiding structure 111, the second air-guiding structure 112, and the support structure 113 and the bottom surface of the housing 13, allowing air inside the dishwasher 1 to be blown out through the second passage 132, thus achieving exhaust of the dishwasher 1.
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As shown in FIG. 6 and 7, in one possible embodiment, the front sidewall of the base 14 is provided with a guiding slot 142, and correspondingly, the second air-guiding structure 112 is provided with a guiding protrusion 1125, and the guiding protrusion 1125 can be inserted into the guiding slot 142. The front sidewall of the base 14 is provided with a second snap-fit groove 143, and correspondingly, the second air-guiding structure 112 is provided with a reverse buckle 1126, and the reverse buckle 1126 can be buckled into the second snap-fit groove 143.
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In the case of adopting the aforementioned embodiment, during the installation process of the second air-guiding structure 112 onto the front sidewall of the base 14, the guiding protrusion 1125 on the second air-guiding structure 112 is first inserted into the guiding slot 142 on the front sidewall of the base 14. This allows the reverse buckle 1126 on the second air-guiding structure 112 to align with the second snap-fit groove 143 on the front sidewall of the base 14. Consequently, the reverse buckle 1126 can be buckled into the second snap-fit groove 143, achieving the fixation of the second air-guiding structure 112 to the front sidewall of the base 14. The upper side of the reverse buckle 1126 is provided with a beveled edge. As the reverse buckle 1126 is gradually inserted into the second snap-fit groove 143, the beveled edge on the upper side of the reverse buckle 1126 abuts against the upper wall of the second snap-fit groove 143. Therefore, the upper wall of the second snap-fit groove 143 exerts a downward pressure on the reverse buckle 1126. Due to the inherent elasticity of the reverse buckle 1126, its head can undergo slight deformation to be snapped onto the second snap-fit groove 143. Furthermore, as the reverse buckle 1126 is subjected to a downward pressure, the connection between the buckle and the second snap-fit groove 143 becomes tighter, enhancing the snap-fit strength.
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Referring to FIG. 13, in one possible embodiment, the condenser bracket 163 is provided with a support groove 1631 for placing the condenser 162 and a wire winding groove 1632 for accommodating the equipment connecting wires 164 of the heat-pump device 16. The support groove 1631 is arranged in the upper portion of the condenser bracket 163, and the wire winding groove 1632 is arranged in the lower portion of the condenser bracket 163.
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In the case of adopting the aforementioned embodiment, the condenser 162 can be placed in the support groove 1631 of the condenser bracket 163 for fixation. Since the heat-pump device 16 comprises equipment connecting wires 164, such as power lines and control lines, in order to avoid entanglement of the equipment connecting wires 164 within the dishwasher 1, a wire winding groove 1632 is provided in the lower portion of the condenser bracket 163 in this embodiment. The power lines and control lines can be stored in the wire winding groove 1632, thereby achieving fixation of the condenser 162 while ensuring tidiness of the equipment connecting wires 164 of the heat pump device 16.
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It should be noted that the above-mentioned embodiments are only used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above-mentioned structure so that the present invention can be applied to more specific application scenarios.
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So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without deviating from the principles of the present invention, those skilled in the art can make equivalent modifications or substitutions to the relevant technical features, and the technical solutions after these modifications or substitutions will all fall within the scope of protection of the present invention.