Novel split air conditioner with automatic defrosting function

Abstract

The utility model provides a novel split air conditioner with an automatic defrosting function. The novel split air conditioner comprises an indoor unit, an outdoor unit and a composite pipe. A first heat exchanger, a first fresh air pipe and an air supply outlet are arranged in the indoor unit; a silencing heat-preservation static pressure air box, a silencing heat-preservation heat-insulation air box, a compressor, and a second heat exchanger and a third heat exchanger which are connected in parallel are arranged in the outdoor unit; a fan is arranged in the silencing heat-preservation static-pressure air bellow, the output end of the fan is connected with a three-way valve, the three-way valve is connected with a first fresh air pipe and a second fresh air pipe, a first air valve is arranged on the first fresh air pipe, and a second air valve is arranged on the second fresh air pipe; one end of the noise-elimination heat-preservation heat-insulation air bellow is connected with an air inlet pipe, the second fresh air pipe is communicated with the air inlet pipe, a third air valve is arranged on the air inlet pipe, an exhaust shutter is arranged on the noise-elimination heat-preservation heat-insulation air bellow, and an exhaust fan is arranged in the noise-elimination heat-preservation heat-insulation air bellow. The split air conditioner has fresh air pre-cooling and pre-heating functions, can prevent hot air in summer or cold air in winter from being fed into a room to affect the comfort degree of a human body, and can solve the problem of frosting of an outdoor unit.

Description

Technical Field

[0001] The present application relates to the technical field of heating, ventilation and air conditioning, and in particular to a novel split air conditioner with automatic defrosting. Background Art

[0002] Split air conditioners are widely used in various residential buildings, offering easy installation and flexible operation. However, a significant issue is the lack of a fresh air system. This results in poor indoor air quality and poor comfort levels for extended periods of time in a relatively closed environment. Opening windows can also lead to poor indoor hygiene, wasted air conditioning energy, and reduced air conditioning effectiveness.

[0003] In extremely low winter temperatures (e.g., below -5°C), heating efficiency is extremely low, or even unusable. This is primarily due to the low temperatures of the outdoor unit's evaporator, which causes water vapor in the air to form frost on the evaporator surface. The thicker the frost, the lower the evaporator's efficiency. To maintain the thermal efficiency of air-cooled heat pump air conditioners, the outdoor evaporator must be periodically defrosted. This process requires heat, which is generated by the reverse operation of the air-cooled heat pump, which turns the heat pump system's condenser into the evaporator and vice versa. The evaporator's heat of evaporation is drawn from the indoor air, consuming indoor heat, lowering the indoor temperature and affecting winter heating comfort. Therefore, more frequent defrosting reduces heating efficiency. Utility Model Content

[0004] In order to improve the problem that the current split air conditioner is difficult to improve indoor air quality and difficult to defrost efficiently, the present application provides a new split air conditioner with automatic defrosting.

[0005] The present application provides a novel split air conditioner with automatic defrosting, which adopts the following technical solution:

[0006] A novel split air conditioner with automatic defrosting comprises an indoor unit and an outdoor unit, wherein a composite pipe is connected between the indoor unit and the outdoor unit;

[0007] The indoor unit is provided with a first heat exchanger, a first fresh air duct and an air supply port;

[0008] The outdoor unit is provided with a sound-absorbing and heat-insulating static pressure wind box, a sound-absorbing and heat-insulating wind box and a compressor, the sound-absorbing and heat-insulating static pressure wind box is provided with a second heat exchanger, the sound-absorbing and heat-insulating wind box is provided with a third heat exchanger, a four-way valve is connected between the input end and the output end of the compressor, and the other two interfaces of the four-way valve are respectively connected to the second heat exchanger and the third heat exchanger;

[0009] The air inlet end of the noise-absorbing and heat-insulating static pressure bellows is provided with a primary filter, and the air outlet end is provided with a fan, the output end of the fan is connected to a three-way valve, one output interface of the three-way valve is connected to the first fresh air duct, and the other interface is connected to the second fresh air duct, the first fresh air duct is provided with a first air valve at one end close to the three-way valve, and the second fresh air duct is provided with a second air valve;

[0010] One end of the sound-absorbing, heat-insulating and heat-insulating wind box is connected to an air inlet pipe, the second fresh air pipe is connected to the air inlet pipe, a third air valve is provided on the air inlet pipe, the sound-absorbing, heat-insulating and heat-insulating wind box is provided with exhaust louvers, and the sound-absorbing, heat-insulating and heat-insulating wind box is provided with an exhaust fan located between the third heat exchanger and the exhaust louvers.

[0011] Furthermore, the second heat exchanger and the third heat exchanger are connected in parallel, and an expansion valve is provided on the parallel pipelines of the two, and the second heat exchanger and the first heat exchanger are connected in series.

[0012] Furthermore, the composite pipe includes a refrigerant gas pipe, a refrigerant liquid pipe, a condensed water pipe, a control line, an inner fresh air pipe and a surface wrapping tape layer wrapped around each pipe. The first air valve is set at one end of the inner fresh air pipe and the other end is connected to the first fresh air pipe.

[0013] Furthermore, the refrigerant gas pipe, the refrigerant liquid pipe and the condensed water pipe are all wrapped with a rubber-plastic insulation layer.

[0014] Furthermore, the inner fresh air duct is made of a corrugated hose material and is covered with the rubber-plastic insulation layer.

[0015] Furthermore, the sound-absorbing and heat-insulating static pressure bellows adopts hard rock wool board for thermal insulation and is also equipped with a sound-absorbing cotton layer for sound-absorbing treatment.

[0016] Furthermore, the sound-absorbing and heat-insulating wind box adopts hard rock wool board for heat insulation, and a louver opening for installing exhaust louvers is opened at the corresponding position of the exhaust fan.

[0017] Furthermore, the first fresh air duct and the second fresh air duct are iron circular air ducts covered with a rubber-plastic insulation layer.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. Solve the problem of lack of fresh air in split air conditioners, realize fresh air supply of split air conditioners and improve indoor air quality;

[0020] 2. Solve the pre-cooling and pre-heating functions of the split air conditioner, improve efficiency, and prevent hot air in summer or cold air in winter from entering the room and affecting human comfort;

[0021] 3. Install a primary filter at the fresh air inlet to maintain a slightly positive pressure when it is delivered to the room, thus improving indoor cleanliness;

[0022] 4. Through the control device, when the air conditioning heat pump system is not running, the fresh air can be operated independently, and the fresh air can be used for free cooling in the transition season, thereby improving indoor comfort;

[0023] 5. The heat energy of the heated fresh air can solve the problem of frost on the outdoor unit, and avoid the indoor unit from frequently starting and stopping or even running in reverse due to defrosting, resulting in failure to heat, thereby affecting the indoor temperature comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of summer operation of an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of winter operation of an embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of winter defrosting operation of an embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of fresh air operation in the transition season of an embodiment of the present application;

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the composite casing according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 1. Indoor unit; 11. First fresh air duct; 12. Air outlet;

[0032] 2. Outdoor unit;

[0033] 3. Composite pipe; 31. Refrigerant gas pipe; 32. Refrigerant liquid pipe; 33. Condensate pipe; 34. Control line; 35. Internal fresh air pipe; 36. Surface wrapping tape layer; 37. Rubber-plastic insulation layer;

[0034] 41. First heat exchanger; 42. Second heat exchanger; 43. Third heat exchanger;

[0035] 51. Noise-absorbing and heat-insulating static pressure bellows; 52. Noise-absorbing and heat-insulating bellows;

[0036] 6. Compressor; 61. Four-way valve; 62. Expansion valve;

[0037] 71. Primary filter; 72. Fan; 73. Three-way valve; 74. Second fresh air duct; 75. First air valve; 76. Second air valve;

[0038] 81. Air inlet duct; 82. Third air valve; 83. Exhaust louvers; 84. Exhaust fan. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0040] Reference Figure 1-Figure 4 The embodiment of the present application discloses a novel split air conditioner with automatic defrosting, which includes an indoor unit 1 and an outdoor unit 2, and a composite pipe 3 is connected between the indoor unit 1 and the outdoor unit 2.

[0041] The indoor unit 1 is provided with a first heat exchanger 41 , a first fresh air duct 11 and an air outlet 12 .

[0042] The outdoor unit 2 is provided with a sound-absorbing, heat-insulating, static pressure wind box 51, a sound-absorbing, heat-insulating, and heat-insulating wind box 52, and a compressor 6. The sound-absorbing, heat-insulating, and heat-insulating wind box 51 is provided with a second heat exchanger 42, and the sound-absorbing, heat-insulating, and heat-insulating wind box 52 is provided with a third heat exchanger 43. A four-way valve 61 is connected between the input and output ends of the compressor 6, and the other two interfaces of the four-way valve 61 are connected to the second heat exchanger 42 and the third heat exchanger 43 respectively; the second heat exchanger 42 and the third heat exchanger 43 are connected in parallel, and an expansion valve 62 is provided on the parallel pipelines of the two, and the second heat exchanger 42 is connected in series with the first heat exchanger 41.

[0043] The air inlet end of the silencer and heat-insulating static pressure bellows 51 is provided with a primary filter 71, and the air outlet end is provided with a fan 72. The output end of the fan 72 is connected to a three-way valve 73. One output interface of the three-way valve 73 is connected to the first fresh air duct 11, and the other interface is connected to the second fresh air duct 74. The first fresh air duct 11 is provided with a first air valve 75 at one end close to the three-way valve 73, and the second fresh air duct 74 is provided with a second air valve 76.

[0044] One end of the sound-absorbing, heat-insulating and insulating wind box 52 is connected to the air inlet pipe 81, the second fresh air pipe 74 is connected to the air inlet pipe 81, a third air valve 82 is provided on the air inlet pipe 81, an exhaust louver 83 is provided on the sound-absorbing, heat-insulating and insulating wind box 52, and an exhaust fan 84 is provided in the sound-absorbing, heat-insulating and insulating wind box 52 between the third heat exchanger 43 and the exhaust louver 83.

[0045] Specifically, refer to Figure 1 and Figure 5 The composite pipe 3 includes a refrigerant gas pipe 31, a refrigerant liquid pipe 32, a condensed water pipe 33, a control line 34, an inner fresh air pipe 35, and a surface wrapping tape layer 36 surrounding each pipe. The inner fresh air pipe 35 is equipped with a first damper 75 at one end and connected to the first fresh air pipe 11 at the other end. The refrigerant gas pipe 31, refrigerant liquid pipe 32, and condensed water pipe 33 are all wrapped in a rubber-plastic insulation layer 37. The inner fresh air pipe 35 is made of corrugated hose and covered with the rubber-plastic insulation layer 37. The first fresh air pipe 11 and the second fresh air pipe 74 are round iron ducts covered with the rubber-plastic insulation layer 37.

[0046] In addition, the sound-absorbing and heat-insulating static pressure bellows 51 adopts hard rock wool board for thermal insulation, and is equipped with a sound-absorbing cotton layer for sound-absorbing treatment; the sound-absorbing and heat-insulating bellows 52 adopts hard rock wool board for thermal insulation, and a louver opening for installing exhaust louvers 83 is opened at the corresponding position of the exhaust fan.

[0047] Thus, when the split air conditioner of the present application is operated in the transition season, Figure 4 , the fan 72 is turned on, the first air valve 75 is opened, the second air valve 76 and the third air valve 82 are closed, and the outdoor fresh air passes through the primary filter 71 and is sent by the fan 72 along the internal fresh air duct 35 into the air outlet 12 of the indoor unit 1, which can meet the ventilation needs of the indoor closed room.

[0048] When the split air conditioner of this application is running in summer, refer to Figure 1 , fan 72 turns on, first air valve 75 opens, second air valve 76 closes, and third air valve 82 opens, simultaneously starting the split air conditioning refrigeration system. The specific operating process is as follows: low-temperature, low-pressure refrigerant vapor is drawn into compressor 6, where it is compressed, becoming high-temperature, high-pressure refrigerant vapor. This vapor is then transported through four-way valve 61 to third heat exchanger 43, which now functions as a condenser. The high-temperature, high-pressure refrigerant vapor condenses in third heat exchanger 43, releasing heat and becoming high-temperature, high-pressure refrigerant liquid (the heat is released via the heat carrier).

[0049] The high-temperature, high-pressure refrigerant liquid then passes through the expansion valve 62, reducing its pressure and becoming a low-temperature, low-pressure refrigerant liquid. It then enters the second heat exchanger 42 and the first heat exchanger 41. At this point, the first and second heat exchangers 41 and 42 function as evaporators. The low-temperature, low-pressure refrigerant liquid evaporates and absorbs heat through the two evaporators, becoming a low-temperature, low-pressure refrigerant gas (the cooling energy is released through the refrigerant), which then returns to the compressor 6 for another refrigeration cycle, repeating over and over again. During this process, as the fan 72 is turned on, fresh air is drawn into the silencer, heat-insulating, and static pressure wind box 51. The fresh air is cooled by the refrigerant evaporation as it passes through the second heat exchanger 42. The pre-cooled fresh air then enters the room through the internal fresh air duct 35, the first fresh air duct 11, and the air outlet 12. At the same time, the exhaust fan 84 is turned on, and the outdoor air enters the sound-absorbing, heat-insulating and heat-insulating wind box 52 through the third air valve 82. After dissipating heat through the third heat exchanger 43, it is discharged through the exhaust louvers 83 on the sound-absorbing, heat-insulating and heat-insulating wind box 52, which can meet the summer heat exchange and indoor comfort requirements.

[0050] When the split air conditioner of this application is running in winter, refer to Figure 2 , the fan 72 is turned on, the first air valve 75 is opened, the second air valve 76 is closed, and the third air valve 82 is opened. At the same time, the split air conditioning heating system starts to run, and its operation process is as follows: the low-temperature and low-pressure refrigerant vapor is sucked into the compressor 6, compressed by the compressor 6, and becomes a high-temperature and high-pressure refrigerant vapor and is transported to the second heat exchanger 42 in the outdoor unit 2 and the first heat exchanger 41 in the indoor unit 1 through the four-way valve 61. At this time, the first heat exchanger 41 and the second heat exchanger 42 are both used as condensers. The condensation heat release effect of the second heat exchanger 42 can preheat the fresh air; the condensation and heat release through the first heat exchanger 41 can heat the indoor air of the room. After the heat release is completed, the refrigerant vapor becomes a high-temperature and high-pressure refrigerant liquid.

[0051] After the high-temperature, high-pressure refrigerant liquid returns through expansion valve 62 and is depressurized, it becomes a low-temperature, low-pressure refrigerant liquid and enters the third heat exchanger 43 in outdoor unit 2. At this point, the third heat exchanger 43 functions as an evaporator. The low-temperature, low-pressure refrigerant liquid evaporates and absorbs heat through the third heat exchanger 43, becoming a low-temperature, low-pressure refrigerant gas (the cooling energy is released through the refrigerant). The gas then returns to compressor 6 for another refrigeration cycle, repeating the cycle. During this process, fresh air passes through the second heat exchanger 42 in outdoor unit 2. The refrigerant condenses and dissipates heat through the second heat exchanger 42, preheating the fresh air. This preheated air is then transported indoors by fan 72, meeting winter heating comfort requirements. At the same time, the exhaust fan 84 is turned on, and the outdoor air enters the sound-absorbing, heat-insulating wind box 52 through the third air valve 82, and passes through the third heat exchanger 43. At this time, the third heat exchanger 43 is used as an evaporator. After the outdoor air is heat absorbed by the third heat exchanger 43, it is discharged by the exhaust louvers 83 on the sound-absorbing, heat-insulating wind box 52, which can meet the heat exchange and indoor comfort requirements in winter.

[0052] When the outdoor temperature is low (e.g. -5°C), the defrosting temperature is reached and the condenser is frosted, that is, the outdoor air enters the sound-absorbing and heat-insulating wind box 52 through the third air valve 82, evaporates and absorbs heat through the third heat exchanger 43, and the third heat exchanger 43 will be frosted; Figure 3 At this time, fan 72 is turned on, first air valve 75 is closed, second air valve 76 is opened, and third air valve 82 is closed. Fresh air is heated by the second heat exchanger 42 from the fresh air inlet. The heated air enters the sound-absorbing, heat-insulating, and heat-insulating wind box 52 through the second fresh air duct 74, heating the third heat exchanger 43 in outdoor unit 2. This prevents the third heat exchanger 43 in outdoor unit 2 from meeting the frosting conditions or removes any frosted dust from the evaporator. The air is then discharged outdoors through exhaust fan 84 and exhaust louvers 83. This process prevents the split air conditioning heating system from periodically running in reverse to defrost, which would cause heat loss in the room and lower the temperature, affecting human comfort. This defrosting device can maintain constant heating in the room, thereby meeting room comfort requirements.

[0053] The implementation principle of a novel split air conditioner with automatic defrosting in the embodiment of the present application is as follows:

[0054] During the transition season, the indoor air conditioning can be operated with fresh air. At this time, it is only necessary to turn on the fan 72, and the outdoor fresh air can be sent into the room through the air ducts, thereby meeting the indoor ventilation needs and improving the indoor air quality. In summer, the air conditioning refrigeration system starts to run, and the fresh air is pre-cooled and cooled by the second heat exchanger 42 in the outdoor unit 2 before entering the room. In winter, the air conditioning refrigeration system runs in reverse, and the fresh air is heated by the second heat exchanger 42 and sent to the room with hot air, thereby meeting the indoor cooling and heating needs.

[0055] When the outdoor temperature reaches the extremely low defrost temperature (such as -5°C), the first air valve 75 is closed, the second air valve 76 is opened, and the third air valve 82 is closed. The fresh air is heated by the second heat exchanger 42, and the hot air defrosts the third heat exchanger 43 in the outdoor unit 2, which can eliminate the impact of frost on the third heat exchanger 43 in the outdoor unit 2. At the same time, it avoids the indoor unit 1 from being unable to heat due to reverse operation of defrosting, thereby affecting the indoor temperature comfort.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A new type of split air conditioner with automatic defrosting, comprising an indoor unit and an outdoor unit, characterized in that: A composite pipe is connected between the indoor unit and the outdoor unit; The indoor unit is provided with a first heat exchanger, a first fresh air duct and an air supply port; The outdoor unit is provided with a sound-absorbing and heat-insulating static pressure wind box, a sound-absorbing and heat-insulating wind box and a compressor, the sound-absorbing and heat-insulating static pressure wind box is provided with a second heat exchanger, the sound-absorbing and heat-insulating wind box is provided with a third heat exchanger, a four-way valve is connected between the input end and the output end of the compressor, and the other two interfaces of the four-way valve are respectively connected to the second heat exchanger and the third heat exchanger; The air inlet end of the noise-absorbing and heat-insulating static pressure bellows is provided with a primary filter, and the air outlet end is provided with a fan, the output end of the fan is connected to a three-way valve, one output interface of the three-way valve is connected to the first fresh air duct, and the other interface is connected to the second fresh air duct, the first fresh air duct is provided with a first air valve at one end close to the three-way valve, and the second fresh air duct is provided with a second air valve; One end of the sound-absorbing, heat-insulating and heat-insulating wind box is connected to an air inlet pipe, the second fresh air pipe is connected to the air inlet pipe, a third air valve is provided on the air inlet pipe, the sound-absorbing, heat-insulating and heat-insulating wind box is provided with exhaust louvers, and the sound-absorbing, heat-insulating and heat-insulating wind box is provided with an exhaust fan located between the third heat exchanger and the exhaust louvers.

2. The novel split air conditioner with automatic defrosting according to claim 1 is characterized in that: The second heat exchanger and the third heat exchanger are connected in parallel, and an expansion valve is provided on the parallel pipelines of the two. The second heat exchanger and the first heat exchanger are connected in series.

3. The novel split air conditioner with automatic defrosting according to claim 1 is characterized in that: The composite pipe includes a refrigerant gas pipe, a refrigerant liquid pipe, a condensed water pipe, a control line, an inner fresh air pipe and a surface wrapping tape layer wrapped around each pipe. The first air valve is provided at one end of the inner fresh air pipe and the other end is connected to the first fresh air pipe.

4. The novel split air conditioner with automatic defrosting according to claim 3 is characterized in that: The refrigerant gas pipe, the refrigerant liquid pipe and the condensed water pipe are all wrapped with a rubber-plastic insulation layer.

5. The novel split air conditioner with automatic defrosting according to claim 3 is characterized in that: The inner fresh air duct is made of corrugated hose material and is covered with the rubber-plastic insulation layer.

6. The novel split air conditioner with automatic defrosting according to claim 1 is characterized in that: The sound-absorbing and heat-insulating static pressure bellows adopts hard rock wool board for heat insulation and is also equipped with a sound-absorbing cotton layer for sound-absorbing treatment.

7. The novel split air conditioner with automatic defrosting according to claim 1 is characterized in that: The sound-absorbing, heat-insulating and heat-insulating wind box adopts hard rock wool board for heat insulation, and a louver opening for installing exhaust louvers is provided at a position corresponding to the exhaust fan.

8. The novel split air conditioner with automatic defrosting according to claim 1 is characterized in that: The first fresh air duct and the second fresh air duct are iron circular air ducts covered with a rubber-plastic insulation layer.

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