Photocuring equipment capable of efficiently controlling temperature

Abstract

The invention provides efficient temperature control photocuring equipment which comprises a curing module, a heat dissipation cavity, an air guide module and a cooling module, and the curing module comprises a curing light source and a curing cavity formed in the light facing side of the curing light source; the heat dissipation cavity is communicated with the curing cavity; the air guide module comprises an air guide pipe and a fan, the air guide pipe is communicated with the curing module and the heat dissipation cavity, and the fan is used for driving air around the curing light source and / or in the curing cavity to enter the heat dissipation cavity; the cooling module comprises an evaporator and a refrigeration assembly, the evaporator is arranged in the heat dissipation cavity and used for cooling air flowing from the heat dissipation cavity to the curing cavity, and the refrigeration assembly is connected with the evaporator and used for cooling a medium in the evaporator. On the premise that the environment temperature is not affected, efficient heat dissipation of the photocuring equipment can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of curing equipment, and particularly relates to a light curing equipment with efficient temperature control. Background Art

[0002] A light curing equipment uses light with a certain intensity as an energy source to initiate a liquid formulation with chemical activity such as curing ink, and realizes an instant rapid reaction curing process on the surface of a substrate. The commonly used light source is ultraviolet light (UV). It has the characteristic of short curing time, which is beneficial to improving production efficiency.

[0003] In an ultraviolet light curing equipment, the light emitted by the light source will generate a large amount of heat after being repeatedly reflected by the reflector. These heats will continuously accumulate in the cavity. Coupled with the fact that the light source itself will also generate a certain amount of heat, a large amount of heat will accumulate inside the equipment. The existing ultraviolet light curing equipment will install cooling fans around the light source and the curing cavity, and there will also be many ventilation holes on the equipment shell. By using the fans to form an air duct, the cold air outside the equipment is inhaled, and the hot air inside the equipment is blown out, so as to achieve temperature reduction. However, the fan cooling method has too low efficiency, resulting in continuous heat accumulation inside the equipment; in addition, the production environment where the light curing equipment is located is generally a clean workshop with constant temperature and humidity. The hot air discharged by the fan will affect the workshop environment, making the temperature around the light curing equipment on the high side, which is not conducive to the temperature stability of the production workshop. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a light curing equipment with efficient temperature control, which can effectively solve the problem of heat accumulation inside the equipment.

[0005] To solve the above technical problem, the present invention provides a light curing equipment with efficient temperature control, including:

[0006] A curing module, including a curing light source and a curing cavity arranged on the light-emitting side of the curing light source;

[0007] A heat dissipation cavity, communicating with the curing cavity;

[0008] An air guiding module, including an air guiding pipe and a fan, the air guiding pipe communicates the curing module with the heat dissipation cavity, and the fan is used to drive the air around the curing light source and / or in the curing cavity into the heat dissipation cavity;

[0009] A cooling module, including an evaporator and a refrigeration component, the evaporator is arranged in the heat dissipation cavity, and is used to cool the air flowing from the heat dissipation cavity to the curing cavity, and the refrigeration component is connected to the evaporator and is used to cool the medium in the evaporator.

[0010] Optionally, a breathable and reflective structure is provided at the connection between the heat dissipation cavity and the curing cavity. The breathable and reflective structure is used to block the light generated by the curing light source from entering the heat dissipation cavity through the curing cavity and allow the air in the heat dissipation cavity to enter the curing cavity; the breathable and reflective structure is located between the evaporator and the curing cavity, and the air in the heat dissipation cavity enters the curing cavity after passing through the evaporator and the breathable and reflective structure in sequence.

[0011] Optionally, the breathable and reflective structure includes at least two breathable and reflective plates stacked on top of each other. Each breathable and reflective plate includes a reflective plate body and a shielding plate. The reflective plate body is provided with breathable holes, and the shielding plate is connected to the reflective plate body and partially shields the breathable holes;

[0012] A gap for the airflow to pass through is provided between two adjacent breathable and reflective plates, and the breathable holes on two adjacent breathable and reflective plates are staggered from each other.

[0013] Optionally, a plurality of strip-shaped breathable holes are provided at intervals on the reflective plate body. Two shielding plates are provided corresponding to each breathable hole. The two shielding plates incline and approach each other from the opposite sides of the breathable hole towards the middle of the breathable hole, and the two shielding plates corresponding to each breathable hole are in a "V" shape in the longitudinal section of the breathable and reflective plate.

[0014] Optionally, the breathable and reflective structure is located on the light-facing side of the curing light source.

[0015] Optionally, the evaporator has a gap for air circulation.

[0016] Optionally, the curing module further includes a light source bracket, a first row of fans, and a lamp box cavity. The light source bracket is provided between the lamp box cavity and the curing cavity. The curing light source is installed on the light source bracket. The first row of fans is provided on the light source bracket and is used to introduce the air around the curing light source into the lamp box cavity, and the lamp box cavity communicates with the air duct.

[0017] Optionally, a second row of fans is provided on the wall of the curing cavity, and the second row of fans is used to drive the air in the curing cavity to flow towards the air duct.

[0018] Optionally, the curing cavity is provided with a reflective plate.

[0019] Optionally, the cooling module further includes a liquid receiving device, which includes a liquid storage container, a liquid level sensor, a drainage assembly, and a liquid drainage controller. The liquid storage container is used to collect the condensed water on the surface of the evaporator. The liquid level sensor is used to detect the liquid level of the condensed water in the liquid storage container. The liquid drainage controller is signal-connected to the liquid level sensor and the drainage assembly, and is used to control the drainage assembly to drain the condensed water in the liquid storage container when the liquid level sensor detects that the condensed water in the liquid storage container exceeds a preset value.

[0020] Implementing the present invention has the following beneficial effects:

[0021] Centering around the curing module, the present invention provides a heat dissipation cavity, a wind guiding module, and a cooling module. The wind guiding module is used to introduce the hot air generated by the curing module into the heat dissipation cavity, and then the cooling module is used to cool the air flowing from the heat dissipation cavity to the curing module. By directing and cooling the heat generated during the operation of the curing light source, it has the advantages of good cooling effect and high cooling capacity utilization rate. It can effectively solve the problem of heat accumulation inside the equipment, and at the same time reduce and avoid the increase in the environmental temperature of the equipment caused by the escape of hot air, resulting in temperature fluctuations in the production workshop. The present invention can achieve efficient heat dissipation of the light curing equipment without affecting the ambient temperature. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the light curing equipment provided by an embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of the light curing equipment provided by an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of the air-permeable and light-reflecting structure in the light curing equipment provided by an embodiment of the present invention;

[0025] Figure 4 is a longitudinal sectional view of the air-permeable and light-reflecting structure in the light curing equipment provided by an embodiment of the present invention.

[0026] In the figure:

[0027] 101 Curing light source, 102 Curing cavity, 103 Light source support, 104 First exhaust fan, 105 Lamp box cavity, 106 Heat dissipation cavity, 107 Air duct, 108 Fan, 109 Evaporator, 110 Refrigeration component, 111 Liquid receiving device,

[0028] 200 Air-permeable and light-reflecting structure, 201 Air-permeable and light-reflecting plate, 202 Reflecting plate body, 203 Baffle, 204 Air-permeable hole, 205 Gap. Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] This embodiment provides a light-curing device with efficient temperature control, including a curing module, a heat dissipation chamber 106, a air guiding module, and a cooling module. The air guiding module introduces the hot air generated by the curing module into the heat dissipation chamber 106, and the cooling module cools the air flowing from the heat dissipation chamber 106 to the curing module. This embodiment has the advantages of good cooling effect and high cold utilization rate by directing and cooling the heat generated during the operation of the curing light source 101, can effectively solve the problem of heat accumulation inside the device, and at the same time can reduce and avoid the situation that the ambient temperature of the device rises due to the escape of hot air, resulting in temperature fluctuations in the production workshop.

[0033] Specifically, please refer to Figures 1 - 4 , the curing module includes a curing light source 101 and a curing chamber 102 provided on the light-emitting side of the curing light source 101; the heat dissipation chamber 106 is communicated with the curing chamber 102; the air guiding module includes an air guiding pipe 107 and a fan 108. The air guiding pipe 107 is communicated with the curing module and the heat dissipation chamber 106, and the fan 108 is arranged on the air guiding pipe 107 for driving the air around the curing light source 101 and / or in the curing chamber 102 to enter the heat dissipation chamber 106; the cooling module includes an evaporator 109 and a refrigeration component 110. The evaporator 109 is arranged in the heat dissipation chamber 106 for cooling the air flowing from the heat dissipation chamber 106 to the curing chamber 102, and the refrigeration component 110 is connected to the evaporator 109 for cooling the medium in the evaporator 109.

[0034] See Figure 2 The curing module further includes a light source bracket 103, a first row of fans 104, and a lamp box cavity 105. The light source bracket 103 is disposed between the lamp box cavity 105 and the curing cavity 102. The curing light source 101 is installed on the light source bracket 103. The first row of fans 104 is arranged on the light source bracket 103 and is used to introduce the hot air around the curing light source 101 into the lamp box cavity 105. The lamp box cavity 105 is communicated with the air duct 107. The curing light source 101 can be a light source that emits ultraviolet light. When the curing light source 101 emits light, it generates heat. In this embodiment, the first row of fans 104 is arranged around the curing light source 101 to quickly draw the hot air around the curing light source 101 into the lamp box cavity 105, preventing the local temperature of the curing light source 101 from being too high. In a possible implementation manner, to avoid the first row of fans 104 blocking the light emitted by the curing light source 101, the first row of fans 104 can be arranged on the backlight side of the curing light source 101.

[0035] In a possible implementation manner, in order to enhance the light intensity and improve the light curing efficiency, a reflector is provided on the inner wall of the curing cavity 102. The light emitted by the curing light source 101 is continuously reflected inside the curing cavity 102, so that the light intensity in the curing cavity 102 is increased. However, this will also cause heat accumulation in the curing cavity 102, forming accumulated heat inside the curing cavity 102. In order to discharge the heat in the curing cavity 102, in this embodiment, the drainage pipe is communicated with the curing cavity 102, and the heat in the curing cavity 102 is discharged into the heat dissipation cavity 106 through the drainage pipe. In order to enhance the heat air flow efficiency in the curing cavity 102, in this embodiment, a second row of fans is also provided on the wall of the curing cavity 102, and the second row of fans is used to drive the air in the curing cavity 102 to flow towards the air duct 107. When both the lamp box cavity 105 and the curing cavity 102 are communicated with the heat dissipation cavity 106 through the drainage pipe, by using the first row of fans 104 and the second row of fans in combination, the air extraction can be more uniform, the air circulation can be smoother, and the cooling efficiency can be improved.

[0036] In this embodiment, since the curing light source 101, the lamp box cavity 105, the drainage pipe, the heat dissipation cavity 106, and the curing cavity 102 form an air circulation loop, the drainage pipe can be set to be only communicated with the lamp box cavity 105 and the heat dissipation cavity 106 to introduce the hot air near the curing light source 101 into the heat dissipation cavity 106 for cooling, or the drainage pipe can be set to be only communicated with the curing cavity 102 and the heat dissipation cavity 106 to introduce the hot air in the curing cavity 102 into the heat dissipation cavity 106 for cooling. Both can cool the air in the circulation loop to a certain extent. Of course, setting both the lamp box cavity 105 and the curing cavity 102 to be communicated with the heat dissipation cavity 106 can draw the hot air near the curing light source 101 and in the curing cavity 102 into the heat dissipation cavity 106 for cooling, making the temperature control effect of the entire air circulation loop better.

[0037] Please refer to Figure 2, the cooling module includes an evaporator 109 and a refrigeration component 110. The evaporator 109 is arranged in the heat dissipation chamber 106. The air in the heat dissipation chamber 106 enters the curing chamber 102 via the evaporator 109. The refrigeration component 110 is connected to the evaporator 109 through a pipeline. The refrigeration component 110, the pipeline, and the evaporator 109 form a medium circulation loop, and the medium can be water. The refrigeration component 110 may include a refrigeration device and a pump. The refrigeration device can be, for example, a water chiller or an outdoor unit of an air conditioner. A certain amount of medium is filled inside the refrigeration device, and the medium is cooled by the refrigeration system of the refrigeration device to form a low-temperature medium, and then flows to the evaporator 109 through the pipeline. The low-temperature medium circulates in the pipeline inside the evaporator 109, so that the surface of the evaporator 109 is cooled, and finally flows back to the refrigeration device through the pipeline to form a cycle, keeping the surface of the evaporator 109 at a relatively low temperature.

[0038] There is also a gap for air circulation provided on the evaporator 109. When the hot air in the heat dissipation chamber 106 flows to the curing chamber 102 via the evaporator 109, the hot air passes through the gap on the evaporator 109 and exchanges heat with the radiator 109, so that the hot air is cooled. There are many styles of the heat dissipation structure of the evaporator 109. For example, the heat dissipation structure can be made into a mesh shape or a fin shape. The present application does not limit the specific style of the heat dissipation structure of the evaporator 109, as long as it can enable air to smoothly pass through the evaporator to achieve heat exchange.

[0039] In a possible implementation manner, the evaporator 109 includes multiple layers of spaced-apart heat dissipation fins, and there is a gap for air circulation between adjacent two layers of heat dissipation fins. When the hot air in the heat dissipation chamber 106 flows to the curing chamber 102 via the evaporator 109, the hot air passes through the gap of the heat dissipation fins and exchanges heat with the cooled heat dissipation fins, so that the hot air is cooled. The denser the heat dissipation fins on the surface of the evaporator 109, the more uniform the heat exchange between the hot air and the evaporator 109.

[0040] Please refer to Figure 2 , there is a breathable and reflective structure 200 at the connection between the heat dissipation chamber 106 and the curing chamber 102. The breathable and reflective structure 200 is used to block the light generated by the curing light source 101 from entering the heat dissipation chamber 106 via the curing chamber 102 and allow the air in the heat dissipation chamber 106 to enter the curing chamber 102; the breathable and reflective structure 200 is located between the evaporator 109 and the curing chamber 102. The air in the heat dissipation chamber 106 enters the curing chamber 102 after passing through the evaporator 109 and the breathable and reflective structure 200 in sequence, so that the heat in the curing chamber 102 is cooled, achieving the purpose of dissipating heat from the device.

[0041] To ensure the smoothness of air circulation, the connection between the heat dissipation cavity 106 and the curing cavity 102 faces the light-facing side of the curing light source 101. Correspondingly, the air-permeable and light-reflective structure 200 is located on the light-facing side of the curing light source 101. Then, the air-permeable and light-reflective structure 200 will receive the light directly emitted by the curing light source 101 and the light reflected by the reflector in the curing cavity 102. To prevent this light from leaking out and allow air circulation, the above air-permeable and light-reflective structure 200 is provided in this embodiment to achieve the effect of air permeability without light transmission. Specifically, the air-permeable and light-reflective structure 200 includes at least two air-permeable and light-reflective plates 201 stacked together. Each air-permeable and light-reflective plate 201 includes a reflector body 202 and a shielding plate 203. The reflector body 202 is provided with air-permeable holes 204, and the shielding plate 203 is connected to the reflector body 202 and partially shields the air-permeable holes 204. A gap 205 for air flow to pass through is provided between two adjacent air-permeable and light-reflective plates 201, and the air-permeable holes 204 on two adjacent air-permeable and light-reflective plates 201 are staggered from each other. Among them, reflective coatings are applied on both the reflector body 202 and the shielding plate 203.

[0042] In a possible implementation manner, please refer to Figure 3 and 4 , the air-permeable and light-reflective structure 200 includes two air-permeable and light-reflective plates 201 stacked together. A plurality of strip-shaped air-permeable holes 204 are provided at intervals on the reflector body 202 of each air-permeable and light-reflective plate 201. Two shielding plates 203 are provided corresponding to each air-permeable hole 204. The two shielding plates 203 incline and approach each other from the opposite sides of the air-permeable hole 204 towards the middle of the air-permeable hole 204. The two shielding plates 203 corresponding to each air-permeable hole 204 are in an "eight" shape in the longitudinal section of the air-permeable and light-reflective plate 201. Moreover, the shielding plates 203 on the air-permeable and light-reflective plate 201 protrude towards the curing cavity 102 from the reflector body 202.

[0043] In other embodiments, the two shielding plates 203 corresponding to the air-permeable hole 204 can also be other shapes in the longitudinal section of the air-permeable and light-reflective plate 201, such as circular rings. Moreover, the number of shielding plates corresponding to the air-permeable hole 204 can be one or more, which is not limited herein. As long as the air-permeable holes 204 on two adjacent air-permeable and light-reflective plates 201 are staggered from each other, the air-permeable and light-reflective structure 200 can achieve the effects of light reflection and air circulation.

[0044] The above air-permeable and light-reflective structure 200 has the following advantages: 1. The air cooled by the evaporator 109 can enter the curing cavity 102 through the air-permeable holes 204 on the reflector body 202, forming an air circulation inside the device; 2. The light emitted by the curing light source 101 can be well reflected inside the curing cavity 102. Since the air-permeable holes 204 of two adjacent air-permeable and light-reflective plates 201 are staggered, the air-permeable holes 204 will not leak light, avoiding the risk of weakening the light intensity inside the device.

[0045] Inside the evaporator 109, a cooled medium flows, causing the surface temperature of the evaporator 109 to be relatively low. After coming into contact with hot air, condensed water will be formed. For this reason, this embodiment is also provided with a liquid receiving device 111, such as Figure 2 As shown, the liquid receiving device 111 includes a liquid storage container, a liquid level sensor, a drainage assembly, and a liquid drainage controller. The liquid storage container is used to collect the condensed water on the surface of the evaporator 109. The liquid level sensor is used to detect the liquid level of the condensed water in the liquid storage container. The liquid drainage controller is signal-connected to the liquid level sensor and the drainage assembly, and is used to control the drainage assembly to drain the condensed water in the liquid storage container when the liquid level sensor detects that the condensed water in the liquid storage container exceeds a preset value. Among them, the liquid storage container can be arranged below the evaporator 109. The drainage assembly includes a water pump and / or a control valve. When the condensed water in the liquid storage container exceeds the preset value, the condensed water can be drained by opening the control valve, or the condensed water can be pumped out by opening the water pump.

[0046] The working process of the light-curing device of the embodiment is as follows:

[0047] (1) Inside the curing module, the curing light source 101 works to generate heat, and the light generates heat through reflection inside the curing cavity 102;

[0048] (2) The fan 108 sends the hot air in the curing module into the heat dissipation cavity 106;

[0049] (3) The refrigeration component 110 makes the surface temperature of the evaporator 109 lower than the surrounding environment temperature. The hot air flows from the heat dissipation cavity 106 to the curing cavity 102 and is cooled when passing through the evaporator 109;

[0050] (4) The cooled air re-enters the curing cavity 102 through the air permeation holes 204 of the air-permeable and light-reflective structure 200.

[0051] In the entire heat dissipation process, no heat exchange occurs between the device and the external environment, and the refrigeration component 110 acts as a medium for heat exchange for heat dissipation. The refrigeration component 110 can be arranged outside the working environment to avoid affecting the constant temperature environment of the clean room where the device is located. The refrigeration component 110 cools the inside of the device more significantly, and since the heat circulates inside the device, the heat dissipation efficiency is greatly improved.

[0052] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0053] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A light curing device with high efficiency temperature control, characterized in that: include: A curing module, comprising a curing light source (101) and a curing cavity (102) arranged on the light-facing side of the curing light source (101); A heat dissipation chamber (106) connected to the curing chamber (102); an air guide module, comprising an air guide duct (107) and a fan (108), wherein the air guide duct (107) connects the curing module with the heat dissipation cavity (106), and the fan (108) is used to drive air around the curing light source (101) and / or in the curing cavity (102) to enter the heat dissipation cavity (106); The cooling module comprises an evaporator (109) and a refrigeration component (110); the evaporator (109) is arranged in the heat dissipation cavity (106) and is used to cool the air flowing from the heat dissipation cavity (106) to the curing cavity (102); the refrigeration component (110) is connected to the evaporator (109) and is used to cool the medium in the evaporator (109).

2. The device according to claim 1, characterized in that A breathable reflective structure (200) is provided at the connection point between the heat dissipation cavity (106) and the curing cavity (102); the breathable reflective structure (200) is used to block the light generated by the curing light source (101) from entering the heat dissipation cavity (106) via the curing cavity (102) and to allow the air in the heat dissipation cavity (106) to enter the curing cavity (102); the breathable reflective structure (200) is located between the evaporator (109) and the curing cavity (102); the air in the heat dissipation cavity (106) passes through the evaporator (109) and the breathable reflective structure (200) in sequence before entering the curing cavity (102).

3. The device according to claim 2, characterized in that The breathable reflective structure (200) comprises at least two breathable reflective plates (201) stacked together, each of the breathable reflective plates (201) comprising a reflective plate body (202) and a shielding plate (203), the reflective plate body (202) being provided with a breathable hole (204), and the shielding plate (203) being connected to the reflective plate body (202) and partially shielding the breathable hole (204); A gap (205) for airflow to pass through is provided between two adjacent air-permeable reflective plates (201), and the air holes (204) on the two adjacent air-permeable reflective plates (201) are staggered.

4. The device according to claim 3, characterized in that The reflector body (202) is provided with a plurality of strip-shaped air holes (204) at intervals, and each of the air holes (204) is provided with two shielding plates (203) corresponding to the two air holes (204). The two shielding plates (203) are inclined and close to each other from two opposite sides of the air hole (204) toward the middle of the air hole (204), and the two shielding plates (203) corresponding to each air hole (204) are in an "eight" shape in the longitudinal section of the air-permeable reflector (201).

5. The device according to any one of claims 2 to 3, characterized in that: The air-permeable reflective structure (200) is located on the light-facing side of the curing light source (101).

6. The device according to claim 1, characterized in that The evaporator (109) has a gap for air circulation.

7. The device according to claim 1, characterized in that The curing module further comprises a light source bracket (103), a first exhaust fan (104) and a light box cavity (105); the light source bracket (103) is arranged between the light box cavity (105) and the curing cavity (102); the curing light source (101) is mounted on the light source bracket (103); the first exhaust fan (104) is arranged on the light source bracket (103) and is used to introduce air around the curing light source (101) into the light box cavity (105); and the light box cavity (105) is connected to the air guide duct (107).

8. The device according to claim 1, characterized in that A second exhaust fan is provided on the wall of the curing chamber (102), and the second exhaust fan is used to drive the air in the curing chamber (102) to flow toward the air guide duct (107).

9. The device according to claim 1, characterized in that The curing chamber (102) is provided with a reflective plate.

10. The device according to claim 1, characterized in that The cooling module further comprises a liquid receiving device (111), the liquid receiving device (111) comprising a liquid storage container, a liquid level sensor, a drainage component and a liquid drainage controller, the liquid storage container being used to collect condensed water on the surface of the evaporator (109), the liquid level sensor being used to detect the liquid level of the condensed water in the liquid storage container, the liquid drainage controller being signal-connected to the liquid level sensor and the drainage component, and being used to control the drainage component to drain the condensed water in the liquid storage container when the liquid level sensor detects that the condensed water in the liquid storage container exceeds a preset value.

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