Heating device and air conditioner with same

Abstract

The utility model provides a heating device and an air conditioner with the same, the heating device is arranged on the side of a heat exchanger and used for heating the heat exchanger, the heat exchanger is installed on a chassis, the heating device comprises a first heating body, and the first heating body extends in the height direction of the heat exchanger; at least part of the first heating body is attached to the heat exchanger; the second heating body is detachably arranged on the base plate, the first heating body is connected with the second heating body, at least part of the second heating body is attached to the heat exchanger, and the heat exchanger is heated through the first heating body and the second heating body; a flow guide part is arranged on the second heating body, and condensate water on the first heating body and the second heating body is guided to the base plate through the flow guide part. The problems that in the prior art, when an air conditioner adopts reversing reverse circulation defrosting, defrosting is not thorough, and a base plate is prone to icing are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner defrosting technical field, specifically, relate to a heating device and have its air conditioner. BACKGROUND

[0002] When the surface temperature of the outdoor heat exchanger is lower than the air freezing point temperature, the water vapor in the external environment will condense into frost on the surface of the outdoor heat exchanger, and the existence of frost seriously blocks the circulation of air, which can greatly reduce the heat exchange efficiency of the outdoor heat exchanger.

[0003] In order to ensure the heating effect, the current air conditioner usually adopts the reversing inverse cycle defrosting method to defrost the outdoor heat exchanger. This defrosting method has low cost and small operation space, but has the defects of incomplete defrosting and easy icing of the chassis. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a heating device and an air conditioner with the same, so as to solve the problem of incomplete defrosting and easy icing of the chassis when the air conditioner in the prior art adopts the reversing inverse cycle defrosting.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a heating device is provided, which is arranged at the side of the heat exchanger and used for heating the heat exchanger. The heat exchanger is installed on the chassis. The heating device comprises: a first heating body, which extends along the height direction of the heat exchanger, and at least part of the first heating body is attached to the heat exchanger; a second heating body, which is detachably arranged on the chassis, the first heating body is connected with the second heating body, at least part of the second heating body is attached to the heat exchanger, and the heat exchanger is heated by the first heating body and the second heating body; a flow guide part is arranged on the second heating body, and the condensed water on the first heating body and the second heating body is guided to the chassis through the flow guide part.

[0006] Further, the flow guide part comprises: a flow guide end face, which is arranged on the second heating body and is inclined relative to the bottom surface of the second heating body, so that the condensed water on the first heating body and the second heating body flows into the chassis along the flow guide end face.

[0007] Further, the second heating body comprises a first connecting end and a second connecting end arranged oppositely, the first connecting end is connected with the chassis, and the second connecting end is connected with the first heating body; the flow guide end face comprises: a first flow guide surface; a second flow guide surface, which is arranged opposite to the first flow guide surface along the width direction of the second heating body, and the horizontal distance between the first flow guide surface and the second flow guide surface gradually increases from the second connecting end to the first connecting end.

[0008] Further, the first heating body is provided with a heating end face abutting against the heat exchanger, at least part of the heating end face being a curved surface.

[0009] Further, the heating device further comprises a lifting assembly arranged on the bottom plate, the second heating body being connected with the lifting assembly, at least part of the lifting assembly being arranged telescopically in the vertical direction to drive the second heating body to move.

[0010] Further, the second heating body comprises a bottom plate, the bottom plate being recessed towards the middle part of the second heating body; a driving end of the lifting assembly is connected with the bottom plate, when the second heating body is in the initial position, the bottom plate covers the lifting assembly, at least part of the bottom plate abutting against the bottom plate.

[0011] Further, the lifting assembly comprises a driving component arranged on the bottom plate, the driving component comprising a driving rod arranged telescopically in the vertical direction, the driving rod being drivingly connected with the bottom plate.

[0012] Further, the heating device further comprises a protective layer arranged on the first heating body and the second heating body, the protective layer being one or more of a graphene coating, a ceramic coating and a zinc oxide coating.

[0013] According to another aspect of the present application, an air conditioner is provided, comprising a heat exchanger, a bottom plate and a heating device, the heat exchanger and the heating device being arranged on the bottom plate respectively, the heating device being arranged at the side of the heat exchanger, at least part of the heating device abutting against the heat exchanger to heat the heat exchanger, the heating device being the heating device of the above-mentioned embodiments.

[0014] Further, the air conditioner further comprises a first temperature detecting component arranged on the heat exchanger to detect the surface temperature of the heat exchanger, a second temperature detecting component arranged on the bottom plate to detect the temperature of the bottom plate, and a third temperature detecting component to detect the ambient temperature of the heat exchanger, the first temperature detecting component, the second temperature detecting component and the third temperature detecting component being signal-connected with the heating device respectively, the first temperature detecting component and the second temperature detecting component being signal-connected with the heating device respectively.

[0015] Further, the heat exchanger is a plurality of heat exchangers, the heating device is a plurality of heating devices, the plurality of heating devices and the plurality of heat exchangers being arranged alternately along the length direction or the width direction of the bottom plate.

[0016] The technical scheme of the utility model discloses, heating device sets up in the side of heat exchanger, is used for heating heat exchanger, heat exchanger installs on the bottom disc, heating device includes first heating body and second heating body, first heating body extends along the height direction of heat exchanger, and at least part of first heating body is pasted with heat exchanger;Second heating body is detachably arranged on the bottom disc, and first heating body is connected with second heating body, and at least part of second heating body is pasted with heat exchanger, and heat exchanger is heated through first heating body and second heating body;Second heating body is provided with flow guide portion, and the condensed water on first heating body and second heating body is guided to the bottom disc through flow guide portion.First heating body extends along the height direction of heat exchanger, and the uniform heating of frost layer on heat exchanger is ensured, and the frost layer is quickly thawed, and the time required for defrosting is greatly shortened.At the same time, second heating body can also heat the condensed water on the bottom disc, avoid the condensed water on the bottom disc freezing, utilize flow guide portion, avoid the condensed water adhering to first heating body or second heating body, set up heating device in the side of heat exchanger, on the one hand ensure that defrosting is clean, improve defrosting efficiency, on the one hand prevent defrosting water from icing on the bottom disc, and simultaneously avoid the problem of wind blade damage caused by icing.This design can improve heat exchange efficiency, ensure the stable operation and efficient heating of air conditioning system in cold environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the application, serve to explain the application. In the drawings:

[0018] Figure 1 A structure schematic view of a first embodiment of the heating device according to the utility model is shown;

[0019] Figure 2 A structure schematic view of a second embodiment of the heating device according to the utility model is shown;

[0020] Figure 3 A structure schematic view of a third embodiment of the heating device according to the utility model is shown;

[0021] Figure 4 A structure schematic view of a first embodiment of the heating device cooperating with the heat exchanger according to the utility model is shown;

[0022] Figure 5 A structure schematic view of a second embodiment of the heating device cooperating with the heat exchanger according to the utility model is shown;

[0023] Figure 6 A control flow chart of the air conditioner according to the utility model is shown.

[0024] Wherein, the above-mentioned drawings include the following reference signs:

[0025] 100, heat exchanger; 200, base plate; 300, heating device; 310, first heating body; 311, heating end face; 320, second heating body; 321, bottom surface; 322, first connecting end; 323, second connecting end; 324, bottom plate; 330, flow guide part; 331, flow guide end face; 332, first flow guide surface; 333, second flow guide surface; 400, lifting assembly; 410, driving part. DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] Please refer to Figures 1 to 3 The present application provides a heating device arranged at the side of the heat exchanger 100 for heating the heat exchanger 100, the heat exchanger 100 is installed on the base plate 200, the heating device comprises: a first heating body 310, the first heating body 310 extends along the height direction of the heat exchanger 100, at least part of the first heating body 310 is attached to the heat exchanger 100; a second heating body 320 is detachably arranged on the base plate 200, the first heating body 310 is connected with the second heating body 320, at least part of the second heating body 320 is attached to the heat exchanger 100, the heat exchanger 100 is heated by the first heating body 310 and the second heating body 320; the second heating body 320 is provided with a flow guide part 330, the condensed water on the first heating body 310 and the second heating body 320 is guided to the base plate 200 by the flow guide part 330.

[0028] According to the heating device provided in the application, the heating device is arranged on the side of the heat exchanger 100 and used for heating the heat exchanger 100. The heat exchanger 100 is installed on the bottom plate 200. The heating device comprises a first heating body 310 and a second heating body 320. The first heating body 310 extends along the height direction of the heat exchanger 100. At least part of the first heating body 310 is attached to the heat exchanger 100. The second heating body 320 is detachably arranged on the bottom plate 200. The first heating body 310 is connected to the second heating body 320. At least part of the second heating body 320 is attached to the heat exchanger 100. The heat exchanger 100 is heated by the first heating body 310 and the second heating body 320. The second heating body 320 is provided with a flow guide part 330. The condensed water on the first heating body 310 and the second heating body 320 is guided to the bottom plate 200 by the flow guide part 330. The first heating body 310 extends along the height direction of the heat exchanger 100, which ensures uniform heating of the frost layer on the heat exchanger 100 and rapid melting of the frost layer, greatly shortening the time required for defrosting. At the same time, the second heating body 320 can also heat the condensed water on the bottom plate 200, avoiding freezing of the condensed water on the bottom plate 200. By using the flow guide part 330, the condensed water is prevented from adhering to the first heating body 310 or the second heating body 320. The heating device is arranged on the side of the heat exchanger 100. On the one hand, it ensures clean defrosting and improves defrosting efficiency. On the other hand, it prevents the defrosting water from freezing on the bottom plate 200 and avoids the problem of wind blade damage caused by freezing. This design can improve the heat exchange efficiency and ensure the stable operation and efficient heating of the air conditioning system in cold environments.

[0029] By reducing the defrosting time, the application avoids the interruption of heating during the defrosting process of the air conditioning system, ensures the stability of the indoor temperature, and improves the user experience when using the air conditioner in winter. At the same time, the detachable second heating body 320 is convenient for users to maintain, reducing maintenance costs and waiting time.

[0030] As shown in Figure 1 The flow guide part 330 comprises a flow guide end surface 331 arranged on the second heating body 320. The flow guide end surface 331 is arranged obliquely relative to the bottom surface 321 of the second heating body 320, so that the condensed water on the first heating body 310 and the second heating body 320 flows into the bottom plate 200 along the flow guide end surface 331. The oblique design of the flow guide end surface 331 guides the condensed water to flow smoothly to the bottom plate, avoiding the accumulation of condensed water on the electric heater or the surface of the heat exchanger, reducing the possibility of secondary frosting. The timely discharge of the condensed water also helps to keep the electric heater dry, prolong its service life, and reduce the risk of electrical failure.

[0031] By precisely controlling the flow direction of condensate, the guide section 330 helps optimize defrost water management, ensuring that defrost water can be quickly and effectively guided from the surface of the electric heater to the chassis drainage system. This not only improves defrosting efficiency but also prevents defrost water from accumulating inside the equipment, reducing the possibility of equipment damage.

[0032] In specific implementation, the second heating body 320 includes a first connecting end 322 and a second connecting end 323 arranged opposite to each other. The first connecting end 322 is connected to the chassis 200, and the second connecting end 323 is connected to the first heating body 310. The guide surface 331 includes a first guide surface 332 and a second guide surface 333. Along the width direction of the second heating body 320, the first guide surface 332 and the second guide surface 333 are arranged opposite to each other. From the second connecting end 323 to the first connecting end 322, the horizontal distance between the first guide surface 332 and the second guide surface 333 gradually increases. The relative arrangement of the first guide surface 332 and the second guide surface 333, coupled with the gradual increase in the horizontal distance from the second connecting end 323 to the first connecting end 322, forms a gradually opening guide structure. This structure can effectively guide condensate or defrost water to flow smoothly along the surface of the heating body, eventually collecting at the bottom and being discharged through the chassis drainage system, avoiding water stagnation and secondary frosting, and improving the system's operating efficiency and reliability.

[0033] The tight connection between the first and second heating elements, combined with their airflow guiding structure, ensures a more uniform heating process. Heat is effectively transferred from the second heating element to the chassis, preventing ice buildup during defrosting. This design guarantees stable operation of the air conditioning system even in low-temperature environments, improving the user experience during winter.

[0034] In this application, the first heating body 310 and the second heating body 320 are integrally formed structures. Electric heating wires are provided inside the first heating body 310 and the second heating body 320. The first heating body 310 and the second heating body 320 are made of metal to quickly conduct heat to the heat exchanger 100 and the chassis 200.

[0035] like Figure 2 As shown, in the second embodiment provided in this application, the first heating body 310 is provided with a heating end face 311 that fits against the heat exchanger 100, and at least a portion of the heating end face 311 is a curved surface. The design of the curved heating end face 311 increases the area of ​​the heating end face 311, which can more accurately transfer heat to the frost layer area and reduce heat loss in the air or non-frost layer area. Therefore, it can reduce energy consumption during the defrosting process, shorten the overall defrosting time, and improve the operating efficiency and energy utilization efficiency of the air conditioning system.

[0036] The design of the curved heating end face 311 on the first heating body 310 not only solves the problems of poor contact between the heater and the heat exchanger and uneven defrosting in the prior art, but also significantly improves the performance and user experience of the air conditioning defrosting system in practical applications by improving heat transfer efficiency, enhancing adaptability and stability.

[0037] like Figure 3 As shown, in the third embodiment provided in this application, the heating device further includes a lifting assembly 400, mounted on the chassis 200, and a second heating body 320 connected to the lifting assembly 400. At least a portion of the lifting assembly 400 is extendable and retractable in the vertical direction to move the second heating body 320. Through adjustment of the lifting assembly, the second heating body can adapt to heat exchangers of different heights, improving heat transfer efficiency. This is particularly important for outdoor heat exchangers with different installation height requirements, as the extendable feature allows the heating device to perform optimally in various environments.

[0038] The retractability of the lifting assembly allows the second heating element to dynamically adjust its heating position based on the thickness of the frost layer. In the initial defrosting stage, the heating element can be positioned in areas with thicker frost. As the frost gradually melts, the heating element can move upwards or downwards, ensuring uniform heating of the entire heat exchanger surface and preventing localized overheating or uneven defrosting, thereby improving defrosting efficiency and thoroughness.

[0039] The retractability of the lifting assembly allows the second heating element to dynamically adjust its heating position based on the thickness of the frost layer. In the initial defrosting stage, the heating element can be positioned in areas with thicker frost. As the frost gradually melts, the heating element can move upwards or downwards, ensuring uniform heating of the entire heat exchanger surface and preventing localized overheating or uneven defrosting, thereby improving defrosting efficiency and thoroughness.

[0040] Furthermore, the second heating body 320 includes a base plate 324, which is recessed towards the center of the second heating body 320. The driving end of the lifting assembly 400 is connected to the base plate 324. When the second heating body 320 is in its initial position, the base plate 324 covers the lifting assembly 400, and at least a portion of the base plate 324 is in contact with the chassis 200. The recessed design of the base plate 324 increases its contact area with the chassis 200, thereby improving heat transfer efficiency. When the base plate 324 is in contact with the chassis 200, heat can be transferred to the chassis more effectively, ensuring that defrosting water does not refreeze on the chassis. At the same time, the lifting assembly 400 can adjust the degree of contact between the base plate 324 and the chassis 200 to meet the heat transfer requirements under different ambient temperatures, achieving more flexible temperature control and further improving defrosting efficiency.

[0041] The combination of the bottom plate 324 and the lifting assembly 400 not only enhances the heat conduction of the heater and the diversion of defrosting water, but also simplifies the installation and maintenance of the electric heater. When the second heating body 320 is in the initial position, the bottom plate 324 can be completely covered on the lifting assembly 400. This structure makes the heating body more stable during installation and disassembly, avoiding damage caused by improper operation. At the same time, at least part of the bottom plate 324 is attached to the bottom plate 200, ensuring the firmness of the installation and reducing the adjustment work during maintenance.

[0042] The initial position is that the second heating body 320 is attached to the bottom plate 200.

[0043] The adjustability of the lifting assembly 400 means that the electric heater can adapt to heat exchanger fins of different thicknesses and different environmental conditions. By adjusting the distance between the driving end and the bottom plate 324, the optimal thermal contact between the heater and the heat exchanger can be ensured, even in the case of heat exchanger fin thickness changes, ensuring the consistency and completeness of defrosting effect.

[0044] In the specific implementation process, the lifting assembly 400 includes a driving component 410 arranged on the bottom plate 200, and the driving component 410 includes a driving rod arranged in a vertically extendable manner, and the driving rod is drivingly connected with the bottom plate 324. The driving rod in the driving component 410 can be extended and retracted in the vertical direction, which enables the second heating body 320 to dynamically adjust the contact distance with the heat exchanger 100 and the bottom plate 200 according to actual needs. This ability is particularly important under different environmental temperatures and frost thicknesses, which can ensure the heating effect while avoiding thermal damage caused by too close contact. The lifting assembly 400 enables the heating device to adapt to different models and sizes of air conditioning systems. The telescopic adjustment of the driving rod is not only suitable for single-row or double-row heat exchangers, but also provides convenience during installation or maintenance, for example, when cleaning the bottom plate or replacing the heating element, the second heating body 320 can be easily lifted to obtain better operation space.

[0045] Preferably, the driving component 410 is a pneumatic cylinder or an electric push rod.

[0046] The heating device further comprises a protective layer body arranged on the first heating body 310 and the second heating body 320, the protective layer body being one or more of a graphene coating, a ceramic coating or a zinc oxide coating. The graphene coating has extremely high thermal conductivity, which can significantly improve the heat conduction efficiency of the heating body, make the heat more quickly and uniformly distributed to the surface of the heat exchanger, accelerate the melting of the frost layer, thereby shortening the defrosting time and improving the overall energy efficiency of the air conditioning system. Using graphene, ceramic or zinc oxide as the protective layer body, these materials all have excellent corrosion resistance and weather resistance, which can protect the heating body from external environmental erosion; the ceramic coating and the zinc oxide coating have good electrical insulation performance, which can effectively avoid electrical short circuit between the heating body and the heat exchanger or the chassis, thereby enhancing the overall safety and reliability of the system. Although graphene is conductive, it can also provide sufficient insulation effect at an appropriate thickness, ensuring the electrical safety of the heating device. These coating materials all have waterproof properties, which can prevent defrosting water from penetrating into the interior of the heating body and prevent the electrical elements from being damaged by moisture. At the same time, the smooth surface of the coating helps the frost layer to slide off, reducing the accumulation of the frost layer on the heating body, and further improving the defrosting effect.

[0047] The application also provides an air conditioner comprising a heat exchanger 100, a chassis 200 and a heating device 300, the heat exchanger 100 and the heating device 300 being arranged on the chassis 200 respectively, the heating device 300 being arranged beside the heat exchanger 100, at least part of the heating device 300 being attached to the heat exchanger 100 to heat the heat exchanger 100, the heating device 300 being the heating device 300 of the above-mentioned embodiments.

[0048] The heating device 300 is directly arranged beside the heat exchanger 100, which can be started immediately when the formation of the frost layer is detected, and the frost layer can be quickly melted through precise temperature control and electric heating, thereby significantly shortening the defrosting time. Compared with the traditional reverse cycle defrosting method, this method is more efficient, which can ensure that the heat exchanger maintains good heat exchange performance in winter and improves the overall heating efficiency of the air conditioner. The electric heater of the heating device 300 not only can heat and defrost the heat exchanger, but also can continue to heat for 3 minutes after defrosting, which ensures that the temperature of the chassis is maintained above zero degrees in any case, thereby effectively avoiding the secondary icing of the defrosting water on the chassis. This not only protects the chassis from freezing damage, but also avoids the risk of damage to air conditioner components such as fan blades due to freezing.

[0049] The air conditioner further comprises: a first temperature detection component arranged on the heat exchanger 100 for detecting the surface temperature of the heat exchanger 100; a second temperature detection component arranged on the bottom plate 200 for detecting the temperature of the bottom plate 200; and a third temperature detection component for detecting the ambient temperature of the heat exchanger 100, wherein the first, second and third temperature detection components are signal-connected with the heating device 300. The first temperature detection component can monitor the surface temperature of the heat exchanger 100 in real time, and once the temperature is detected to be lower than the set threshold value, it indicates that the frost layer starts to form, and the system can immediately start the heating device 300 for defrosting. This precise temperature control avoids premature or late defrosting operation, ensures that the defrosting process is performed only when necessary, and improves the defrosting efficiency and energy utilization efficiency; the second temperature detection component monitors the temperature of the bottom plate 200 in real time, ensures that the bottom plate temperature will not drop below the freezing point, prevents the defrosting water from re-icing on the bottom plate, thereby avoiding the problems of wind blade jamming, unstable equipment operation and the like caused by the freezing of the bottom plate, and enhancing the reliability and operation safety of the equipment. The third temperature detection component detects the ambient temperature of the heat exchanger 100, so that the heating device 300 can intelligently adjust the heating strategy according to the outdoor temperature change. In extremely cold conditions, the heating device can preheat to prevent the heat exchanger surface from rapidly frosting, or reduce heating when the temperature rises to avoid excessive energy consumption.

[0050] The multi-dimensional temperature monitoring realizes precise control of the heating device 300, reduces unnecessary heating time and power, thereby reducing the energy consumption of the air conditioner during the defrosting process and improving the energy utilization efficiency of the overall system. The real-time signal connection of the temperature detection component and the heating device enables the system to quickly respond to temperature changes and timely start the defrosting program, avoiding the influence of frost accumulation on the heat exchange efficiency and optimizing the response speed and operation efficiency of the system.

[0051] The heat exchanger 100 is multiple, and the heating device 300 is multiple, wherein the multiple heating devices 300 and the multiple heat exchangers 100 are arranged alternately along the length direction or the width direction of the bottom plate 200. The heating device 300 is single-row or double-row according to the different types of heat exchangers, adopts different electric heater arrangement modes, can adapt to different models and configurations of air conditioners, and improves the universality and adaptability of the system. At the same time, the fixed connection and vertical placement of the electric heater with the bottom plate, and the inverted funnel-shaped design of the electric heater enable the defrosting water to be discharged along the bottom slope, avoiding the problem of water accumulation, and further enhancing the flexibility and practicality of the system.

[0052] Specifically, when the outdoor environment temperature is detected to be ≤ 0℃, the surface temperature of the heat exchanger 100 is monitored, and when the surface temperature of the heat exchanger 100 is ≤ -2℃, the four-way reversing valve is turned to start the reversing reverse cycle defrosting mode. When the difference between the outdoor temperature and the outdoor coil temperature is ≥ 3℃ and continues to increase, the heating device is started. After the air conditioner exits the reversing reverse cycle defrosting mode, the heating device is kept on for 3 minutes and then turned off, thereby improving the defrosting efficiency of the air conditioner. In addition, the heating device can maintain the bottom plate temperature above 0℃ while defrosting, thereby avoiding the problem of secondary frosting or icing of the defrosting water on the bottom plate 200. The heating device is fixed at the bottom of the bottom plate, vertically placed, and close to the outdoor heat exchanger fins. For a single-row outdoor heat exchanger, the heating device is placed on both sides of the heat exchanger 100, as shown in Figure 4 . For a double-row outdoor heat exchanger, the heating device is placed on both sides and in the middle of the heat exchanger, as shown in Figure 5 .

[0053] The air conditioner of the present application. By placing a heating device at the contact end of the bottom plate 200 and the outdoor heat exchanger, on the one hand, the defrosting is ensured to be clean and the defrosting efficiency is improved, and on the other hand, the problem of damage to the fan blades caused by icing of the defrosting water on the bottom is prevented. By detecting the outdoor environment temperature and the outdoor heat exchanger tube wall temperature, the heating device can be accurately controlled to be turned on, thereby avoiding the problem of early start of the heating device, increasing the energy consumption of the air conditioner, and causing waste of electric energy. At the same time, the heating device can accelerate the defrosting speed, shorten the defrosting period, and thereby improve the heating effect. In addition, the heating device is divided into two placement modes according to the type of the outdoor heat exchanger, and is fixed at the bottom of the bottom plate and vertically placed close to the outdoor heat exchanger fins. The shape is a inverted funnel, and the inverted funnel shape can make the defrosting water flow down the slope of the bottom to the bottom plate and be discharged, thereby preventing water accumulation.

[0054] When the air conditioner is in heating operation, the water vapor in the external environment will condense into frost on the surface of the outdoor heat exchanger because the outdoor heat exchanger surface temperature is usually lower than the air freezing point temperature. The presence of this layer of frost seriously hinders the normal flow of air, greatly reduces the heat exchange efficiency of the outdoor heat exchanger, and thereby affects the heating performance of the entire air conditioning system. At present, the reversing reverse cycle defrosting method is commonly used in air conditioners to solve this problem. However, this method has two main drawbacks: first, the defrosting effect is not complete; second, during the defrosting process, the melted frost water is prone to re-icing at the bottom plate, affecting the normal operation and service life of the equipment. In order to overcome the above problems existing in the prior art, the present application proposes an air conditioner. By increasing a heating device at the bottom of the outdoor heat exchanger and combining with an accurate temperature control strategy, a more efficient and complete defrosting effect is achieved, and the problem of bottom plate icing is effectively prevented.

[0055] The defrosting system of the air conditioner mainly comprises an outdoor heat exchanger, a four-way reversing valve, a heating device and a temperature sensor. The temperature sensor is used to detect the outdoor ambient temperature, the outdoor unit pipe wall temperature and the chassis temperature; the four-way reversing valve is used to realize the switching between the heating and defrosting modes; and the heating device adopts different arrangement modes according to the types of the heat exchanger.

[0056] The control strategy of the air conditioner is as shown in Figure 6

[0057] (1) Defrosting starting condition:

[0058] When the outdoor ambient temperature is detected to be ≤0℃, the outdoor unit pipe wall temperature is monitored;

[0059] When the outdoor unit pipe wall temperature is ≤-2℃, the four-way reversing valve is switched to enter the defrosting mode.

[0060] (2) Heating device control:

[0061] When the difference between the outdoor ambient temperature and the outdoor unit pipe wall temperature is ≥3℃ and continuously increases, it indicates that the refrigerant heat exchange effect is reduced and the frosting is serious, and the corresponding heating device is turned on. For the single-row outdoor heat exchanger, the electric heater 1 is turned on; and for the double-row outdoor heat exchanger, the electric heaters 1 and 2 are turned on at the same time.

[0062] (3) Chassis anti-freezing control:

[0063] When the chassis temperature is detected to be ≤0℃, the electric heater 2 (for the single-row outdoor heat exchanger) or the electric heater 3 (for the double-row outdoor heat exchanger) is turned on.

[0064] (4) Post-defrosting treatment:

[0065] After the air conditioner exits the reversing cycle defrosting mode, the heating device continues to work for 3 min to ensure complete defrosting.

[0066] Heating device arrangement:

[0067] (1) Single-row outdoor heat exchanger: The heating device is in contact with the chassis and is placed on both sides of the heat exchanger, as shown in Figure 4 , the left heating device 300 is the electric heater 1, and the right heating device 300 is the electric heater 2.

[0068] (2) Double-row outdoor heat exchanger: The heating device is in contact with the chassis and is placed on the left side, the middle and the right side of the heat exchanger, as shown in Figure 5 , the left heating device 300 is the electric heater 1, the right heating device 300 is the electric heater 2, and the middle heating device 300 is the electric heater 3.

[0069] ​The application controls the starting time and duration of the heating device accurately, ensures that the frost layer is completely removed, and solves the problem of icing of defrosting water on the bottom plate.

[0070] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0071] According to the heating device provided by the application, the heating device is arranged on the side of the heat exchanger 100 and used for heating the heat exchanger 100, the heat exchanger 100 is installed on the bottom plate 200, the heating device comprises a first heating body 310 and a second heating body 320, the first heating body 310 extends along the height direction of the heat exchanger 100, and at least part of the first heating body 310 is attached to the heat exchanger 100; the second heating body 320 is detachably arranged on the bottom plate 200, the first heating body 310 is connected with the second heating body 320, at least part of the second heating body 320 is attached to the heat exchanger 100, and the heat exchanger 100 is heated by the first heating body 310 and the second heating body 320; the second heating body 320 is provided with a flow guide part 330, and the condensed water on the first heating body 310 and the second heating body 320 is guided to the bottom plate 200 through the flow guide part 330. The first heating body 310 extends along the height direction of the heat exchanger 100, ensuring uniform heating of the frost layer on the heat exchanger 100, quickly melting the frost layer, and greatly shortening the time required for defrosting. At the same time, the second heating body 320 can also heat the condensed water on the bottom plate 200, avoiding freezing of the condensed water on the bottom plate 200, using the flow guide part 330, avoiding the condensed water from adhering to the first heating body 310 or the second heating body 320, arranging the heating device on the side of the heat exchanger 100, on the one hand, ensuring clean defrosting and improving defrosting efficiency, and on the other hand, preventing defrosting water from icing on the bottom plate 200, and at the same time, avoiding the problem of damage of the fan blade caused by icing. This design can improve the heat exchange efficiency and ensure stable operation and efficient heating of the air conditioning system in a cold environment.

[0072] The above only describes preferred embodiments of the utility model and is not used to limit the utility model, and for those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A heating device arranged at a side of a heat exchanger (100) for heating the heat exchanger (100), the heat exchanger (100) being mounted on a base pan (200), characterized in that, The heating device comprises: A first heating body (310) extending along the height direction of the heat exchanger (100), at least part of the first heating body (310) being attached to the heat exchanger (100); A second heating body (320) detachably arranged on the bottom disc (200), the first heating body (310) being connected to the second heating body (320), at least part of the second heating body (320) being attached to the heat exchanger (100), the heat exchanger (100) being heated by the first heating body (310) and the second heating body (320); The second heating body (320) is provided with a flow guide part (330), and the condensed water on the first heating body (310) and the second heating body (320) is guided to the bottom disc (200) through the flow guide part (330).

2. The heating device of claim 1, wherein The flow guide part (330) comprises: A flow guide end surface (331) arranged on the second heating body (320), the flow guide end surface (331) being arranged obliquely relative to the bottom surface (321) of the second heating body (320), so that the condensed water on the first heating body (310) and the second heating body (320) flows into the bottom disc (200) along the flow guide end surface (331).

3. The heating device of claim 2, wherein, The second heating body (320) comprises oppositely arranged first and second connecting ends (322, 323), the first connecting end (322) being connected to the bottom disc (200), and the second connecting end (323) being connected to the first heating body (310); the flow guide end surface (331) comprises: A first flow guide surface (332); A second flow guide surface (333) arranged opposite to the first flow guide surface (332) along the width direction of the second heating body (320), the horizontal distance between the first flow guide surface (332) and the second flow guide surface (333) gradually increasing from the second connecting end (323) to the first connecting end (322).

4. The heating device of claim 1, wherein, The first heating body (310) is provided with a heating end surface (311) attached to the heat exchanger (100), at least part of the heating end surface (311) being a curved surface.

5. The heating device of claim 1, wherein, The heating device further comprises: A lifting assembly (400) arranged on the bottom disc (200), the second heating body (320) being connected to the lifting assembly (400), at least part of the lifting assembly (400) being telescopically arranged in the vertical direction to drive the second heating body (320) to move.

6. The heating device of claim 5, wherein, The second heating body (320) comprises a bottom plate (324) recessed towards the middle part of the second heating body (320); The driving end of the lifting assembly (400) is connected with the bottom plate (324), and the bottom plate (324) covers the lifting assembly (400) when the second heating body (320) is in the initial position, and at least part of the bottom plate (324) is attached to the bottom disc (200).

7. The heating device of claim 6, wherein The lifting assembly (400) comprises: A driving component (410) is arranged on the bottom disc (200), and the driving component (410) comprises a driving rod arranged in a vertically extendable manner, and the driving rod is drivingly connected with the bottom plate (324).

8. The heating device of claim 1, wherein, The heating device further comprises: A protective layer is arranged on the first heating body (310) and the second heating body (320), and the protective layer is one or more of a graphene coating, a ceramic coating or a zinc oxide coating.

9. An air conditioner comprising a heat exchanger (100), a base pan (200), and a heating device (300), the heat exchanger (100) and the heating device (300) being provided on the base pan (200), respectively, the heating device (300) being provided laterally of the heat exchanger (100), at least a portion of the heating device (300) being in contact with the heat exchanger (100) to heat the heat exchanger (100), characterized in that, The heating device (300) is the heating device (300) of any one of claims 1 to 8.

10. The air conditioner of claim 9, wherein The air conditioner further comprises: A first temperature detection component is arranged on the heat exchanger (100) and is used for detecting the surface temperature of the heat exchanger (100); A second temperature detection component is arranged on the bottom disc (200) and is used for detecting the temperature of the bottom disc (200); A third temperature detection component is used for detecting the ambient temperature of the heat exchanger (100), and the first temperature detection component, the second temperature detection component and the third temperature detection component are respectively signal-connected with the heating device (300).

11. The air conditioner of claim 9, wherein The heat exchanger (100) is multiple, and the heating device (300) is multiple, and multiple heating devices (300) and multiple heat exchangers (100) are arranged in the length direction or the width direction of the bottom disc (200) in turn.

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