CN111059630B - Air conditioner indoor unit and air conditioning system - Google Patents

Air conditioner indoor unit and air conditioning system Download PDF

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Publication number
CN111059630B
CN111059630B CN201911425458.0A CN201911425458A CN111059630B CN 111059630 B CN111059630 B CN 111059630B CN 201911425458 A CN201911425458 A CN 201911425458A CN 111059630 B CN111059630 B CN 111059630B
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Prior art keywords
heat exchanger
branch
air
indoor heat
way valve
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CN201911425458.0A
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CN111059630A (en
Inventor
黄柏良
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Publication of CN111059630A publication Critical patent/CN111059630A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied air
    • F24F1/0073—Indoor units, e.g. fan coil units with means for purifying supplied air characterised by the mounting or arrangement of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves

Abstract

The invention provides an air conditioner indoor unit and an air conditioner system. Wherein, the indoor unit of the air conditioner is provided with an air inlet channel; the air-conditioning indoor unit comprises: the first indoor heat exchanger is arranged on the air inlet channel; the second indoor heat exchanger is arranged on the air inlet channel and is positioned at the upstream of the first indoor heat exchanger; the first indoor heat exchanger and the second indoor heat exchanger are communicated through a refrigerant pipeline, and the refrigerant pipeline comprises a series pipeline for connecting the first indoor heat exchanger and the second indoor heat exchanger in series; and the first expansion valve is arranged on the serial pipeline and is positioned between the first indoor heat exchanger and the second indoor heat exchanger. The technical scheme of the invention solves the problem that the air conditioning system in the prior art cannot heat the fresh air in a gradient manner in the heating mode.

Description

Air conditioner indoor unit and air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner indoor unit and an air conditioning system.
Background
The air-conditioning indoor unit of the fresh air conditioning system in the related art comprises two indoor heat exchangers, and when the fresh air conditioning system is in a heating mode, the two indoor heat exchangers are connected in parallel, so that fresh air sequentially passes through the two indoor heat exchangers, and then the fresh air is heated to a proper temperature and then is sent into a room.
However, since the two indoor heat exchangers in the related art are simply connected in parallel, the temperature of the refrigerant discharged into the two indoor heat exchangers is the same. When the new trend passes through first indoor heat exchanger, its temperature has risen to higher temperature, when passing through second indoor heat exchanger again, the heat transfer difference in temperature is less to lead to the heat transfer effect poor, can't carry out the step heating to the new trend, lead to air conditioning system's the efficiency of heating to be low.
Disclosure of Invention
The invention mainly aims to provide an air conditioner indoor unit and an air conditioner system, and aims to solve the problem that the air conditioner system in the prior art cannot perform step heating on fresh air in a heating mode.
In order to achieve the above object, according to one aspect of the present invention, there is provided an indoor unit of an air conditioner having an air intake passage; the air-conditioning indoor unit comprises: the first indoor heat exchanger is arranged on the air inlet channel; the second indoor heat exchanger is arranged on the air inlet channel and is positioned at the upstream of the first indoor heat exchanger; the first indoor heat exchanger and the second indoor heat exchanger are communicated through a refrigerant pipeline, and the refrigerant pipeline comprises a series pipeline for connecting the first indoor heat exchanger and the second indoor heat exchanger in series; and the first expansion valve is arranged on the serial pipeline and is positioned between the first indoor heat exchanger and the second indoor heat exchanger.
Further, the refrigerant pipeline comprises a parallel pipeline for connecting the first indoor heat exchanger and the second indoor heat exchanger in parallel; the air conditioning indoor unit further comprises: a second expansion valve provided on the parallel pipe and located upstream of the first indoor heat exchanger; a third expansion valve disposed on the parallel pipe and located at an upstream of the second indoor heat exchanger, so that a temperature difference exists between a temperature of the refrigerant flowing into the first indoor heat exchanger and a temperature of the refrigerant flowing into the second indoor heat exchanger through the third expansion valve and the second expansion valve; and the switching valve group is arranged on the refrigerant pipeline, so that the first indoor heat exchanger and the second indoor heat exchanger are arranged in series or in parallel by adjusting the on-off condition of the switching valve group.
Further, the refrigerant pipeline includes: the first end of the first common branch is communicated with the first interface of the first indoor heat exchanger; the first end of the first series branch is communicated with the second end of the first common branch, and the second end of the first series branch is communicated with the second port of the second indoor heat exchanger so as to form a series pipeline through the first series branch; the first expansion valve is arranged on the first serial branch; the first end of the first parallel branch is communicated with the second end of the first common branch, and the second end of the first parallel branch is used for being communicated with a second interface of an outdoor heat exchanger of the air conditioner outdoor unit so as to form a parallel pipeline through the first parallel branch; the second expansion valve is arranged on the first parallel branch; when the first serial branch is in a conducting state and the first parallel branch is in a disconnecting state, the refrigerant flowing out of the first interface of the first indoor heat exchanger flows into the second interface of the second indoor heat exchanger through the first serial branch; when the first serial branch is in a disconnected state and the first parallel branch is in a connected state, the refrigerant flowing out of the outdoor heat exchanger flows into the first interface of the first indoor heat exchanger through the first parallel branch.
Further, the switching valve block includes: a connection end A1 of the first three-way valve is connected with the second end of the first common branch, a connection end F1 of the first three-way valve is connected with the first end of the first series branch, and a connection end B1 of the first three-way valve is connected with the first end of the first parallel branch; when the connection terminal a1 and the connection terminal F1 are in a conducting state, the first series branch is in a conducting state, and the first parallel branch is in a disconnecting state; when the connection terminal a1 and the connection terminal B1 are in the on state, the first series branch is in the off state, and the first parallel branch is in the on state.
Further, the switching valve block includes: the first two-way valve is arranged on the first series branch; the second two-way valve is arranged on the first parallel branch; when the first two-way valve is in an opening state and the second two-way valve is in a closing state, the first series branch is in a conducting state, and the first parallel branch is in a disconnecting state; when the second two-way valve is in an on state and the second two-way valve is in an on state, the first series branch is in an on state and the first parallel branch is in an off state.
Further, the refrigerant pipeline includes: the first end of the second shared branch is used for being connected with a compressor of the air conditioner outdoor unit; a first end of the second serial branch is communicated with a second end of the second common branch, and a second end of the second serial branch is communicated with a second interface of the first indoor heat exchanger so as to form a serial pipeline through the second serial branch; a first end of the first parallel branch is communicated with a first end of the first common branch, and a second end of the first parallel branch is communicated with a first interface of the first indoor heat exchanger so as to form a first parallel pipeline through the first parallel branch; when the second series branch is in a conducting state and the second parallel branch is in a disconnecting state, the refrigerant discharged by the compressor flows into the second interface of the first indoor heat exchanger through the second series branch; when the second serial branch is in a disconnected state and the second parallel branch is in a connected state, the refrigerant flowing out of the second interface of the second indoor heat exchanger flows into the compressor through the second parallel branch.
Further, the switching valve block includes: a connection end A2 of the second three-way valve is connected with the second end of the second common branch, a connection end F2 of the second three-way valve is connected with the first end of the second serial branch, and a connection end B2 of the second three-way valve is connected with the first end of the second parallel branch; when the connection terminal a2 and the connection terminal F2 are in a conducting state, the second series branch is in a conducting state, and the second parallel branch is in a disconnecting state; when the connection terminal a2 and the connection terminal B2 are in the on state, the second series branch is in the off state, and the second parallel branch is in the on state.
Further, the switching valve block includes: the third two-way valve is arranged on the second serial branch; the fourth two-way valve is arranged on the second parallel branch; when the third two-way valve is in an on state and the fourth two-way valve is in an off state, the second series branch is in an on state and the second parallel branch is in an off state; when the fourth two-way valve is in an on state and the fourth two-way valve is in an on state, the second series branch is in an on state and the second parallel branch is in an off state.
Further, machine in the air conditioning has the passageway of airing exhaust, and machine still includes in the air conditioning: the total heat exchanger is arranged at the upstream of the second indoor heat exchanger, and the air inlet channel and the air exhaust channel flow through the total heat exchanger so as to exchange heat between fresh air in the air inlet channel and return air in the air exhaust channel; the air inlet channel comprises a first air inlet section and a second air inlet section, the first air inlet section is located in the total heat exchanger, the second air inlet section is located on the downstream of the first air inlet section, the first air exhaust section is located in the total heat exchanger, the second air exhaust section is located on the upstream of the first air exhaust section, and the second air exhaust section is communicated with the second air inlet section.
Further, air inlet channel is including the third air inlet section that is located first air inlet section upper reaches, and the machine still includes in the air conditioning: the first filtering structure is arranged on the third air inlet section; and/or the second filtering structure is arranged on the second air inlet section and positioned at the upstream of the second indoor heat exchanger, and the communication point of the second air exhaust section and the second air inlet section is positioned at the upstream of the second filtering structure.
Further, the air conditioning indoor unit includes: the indoor unit shell is provided with a containing cavity, and an outdoor air inlet, an indoor air supply outlet, an indoor air return inlet and an outdoor air outlet which are communicated with the containing cavity; the separation structure is arranged in the accommodating cavity to separate the accommodating cavity into a first cavity communicated with the outdoor air inlet, a second cavity communicated with the indoor air supply outlet, a third cavity communicated with the indoor air return inlet and a fourth cavity communicated with the outdoor air outlet; the first indoor heat exchanger, the second indoor heat exchanger and the second air inlet section are all arranged in the second chamber; the second air exhaust section is arranged in the third chamber; the air exhaust channel comprises a third air exhaust section positioned at the downstream of the first air exhaust section, and the third air exhaust section is arranged in the fourth cavity.
According to another aspect of the invention, an air conditioning system is provided, and the air conditioning system comprises the air conditioning indoor unit.
Further, the air conditioning system has a heating mode, and the air conditioning system further includes an air conditioning outdoor unit including: the compressor and the outdoor heat exchanger are communicated with each other through a refrigerant pipeline to realize the circulation of a refrigerant; the compressor is a double-suction single-row compressor and is provided with a first suction port, a second suction port and an exhaust port; the connecting end D1 of the first four-way valve and the connecting end D2 of the second four-way valve are both communicated with the exhaust port; a connecting end E1 of the first four-way valve is communicated with a second interface of a first indoor heat exchanger of the indoor unit of the air conditioner, and a connecting end E2 of the second four-way valve is selectively communicated with the second interface of the first indoor heat exchanger; a connection end S1 of the first four-way valve is communicated with the first air suction port, and a connection end S2 of the second four-way valve is communicated with the second air suction port; the connection end C1 of the first four-way valve and the connection end C2 of the second four-way valve are both communicated with the first interface of the outdoor heat exchanger, so that the refrigerant in the refrigerant pipeline flows into the series pipeline through the first four-way valve and the second four-way valve.
By applying the technical scheme of the invention, when the air conditioning system is in a heating mode, the first indoor heat exchanger and the second indoor heat exchanger in the air conditioning indoor unit are arranged in series, and the temperature of the refrigerant flowing out of the first indoor heat exchanger is regulated by the first expansion valve, so that the temperature of the refrigerant flowing into the first indoor heat exchanger is higher than that of the refrigerant flowing into the second indoor heat exchanger. Therefore, after the fresh air passes through the second indoor heat exchanger to perform primary heat exchange with the refrigerant with a lower temperature, the fresh air passes through the first indoor heat exchanger to perform secondary heat exchange with the refrigerant with a higher temperature, so that the air-conditioning indoor unit provided by the application can perform step heating on the fresh air, the heat exchange effect is good, and the heating efficiency of the air-conditioning system is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic process flow diagram of an air conditioning system according to a first embodiment of the present invention, wherein the air conditioning system is in a heating mode;
fig. 2 is a schematic process flow diagram of an air conditioning system according to a first embodiment of the invention, wherein the air conditioning system is in a cooling mode;
fig. 3 is a schematic process flow diagram of an air conditioning system according to a second embodiment of the present invention, wherein the air conditioning system is in a heating mode;
fig. 4 shows a process flow diagram of an air conditioning system according to a second embodiment of the present invention, wherein the air conditioning system is in a cooling mode.
Wherein the figures include the following reference numerals:
101. a first common branch; 102. a first series branch; 103. a first parallel branch; 104. a second common branch; 105. a second series branch; 106. a second parallel branch; 107. a third common branch; 108. a fourth common branch; 10. a first indoor heat exchanger; 20. a second indoor heat exchanger; 30. a first expansion valve; 40. a second expansion valve; 50. a third expansion valve; 60. switching valve groups; 61. a first three-way valve; 62. a first two-way valve; 63. a second two-way valve; 64. a second three-way valve; 65. a third two-way valve; 66. a fourth two-way valve; 70. an outdoor heat exchanger; 80. a compressor; 90. a total heat exchanger; 100. a first filter structure; 110. a second filter structure; 120. an indoor housing; 121. an outdoor air inlet; 122. an indoor air supply outlet; 123. an indoor return air inlet; 124. an outdoor air outlet; 130. a partition structure; 131. a first chamber; 132. a second chamber; 133. a third chamber; 134. a fourth chamber; 141. a first four-way valve; 142. a second four-way valve; 150. an outdoor housing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an air conditioner indoor unit and an air conditioner system, and aims to solve the problem that the air conditioner system in the prior art cannot perform cascade heating on fresh air in a heating mode.
Example one
As shown in fig. 1, the present application provides an indoor unit of an air conditioner, which has an air inlet passage; the air-conditioning indoor unit comprises a first indoor heat exchanger 10, a second indoor heat exchanger 20 and a first expansion valve 30, wherein the first indoor heat exchanger 10 is arranged on an air inlet channel, and the second indoor heat exchanger 20 is arranged on the air inlet channel and is positioned at the upstream of the first indoor heat exchanger 10; the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are communicated through a refrigerant pipeline, the refrigerant pipeline includes a serial pipeline for connecting the first indoor heat exchanger 10 and the second indoor heat exchanger 20 in series, and the first expansion valve 30 is disposed on the serial pipeline and between the first indoor heat exchanger 10 and the second indoor heat exchanger 20.
In the first embodiment, as shown in fig. 1, when the air conditioning system is in the heating mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 of the indoor unit of the air conditioner are arranged in series, the refrigerant passes through the first indoor heat exchanger 10, the first expansion valve 30 and the second indoor heat exchanger 20 in sequence, and the temperature of the refrigerant flowing out of the first indoor heat exchanger 10 is adjusted by the first expansion valve 30, so that the temperature of the refrigerant flowing into the first indoor heat exchanger 10 is higher than the temperature of the refrigerant flowing into the second indoor heat exchanger 20. Therefore, after the fresh air is subjected to heat exchange with the refrigerant with a lower temperature in the second indoor heat exchanger 20 through the second indoor heat exchanger 20 to realize primary heating, the fresh air is subjected to heat exchange with the refrigerant with a higher temperature in the first indoor heat exchanger 10 through the first indoor heat exchanger 10 to realize secondary heating, so that the step heating of the fresh air is realized, the heat exchange effect is good, and the heating efficiency of the air conditioning system is further improved.
In a specific implementation, the first expansion valve 30 is an electronic expansion valve, and the temperature of the refrigerant flowing out of the first expansion valve can be controlled by the electronic expansion valve, so that the temperature difference between the refrigerant in the first indoor heat exchanger 10 and the refrigerant in the second indoor heat exchanger 20 is adjusted, and a better step heating effect is achieved.
In an optional embodiment of the present application, when the air conditioning system is in the cooling mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 in the indoor unit of the air conditioner are arranged in series, the refrigerant passes through the second indoor heat exchanger 20, the first expansion valve 30 and the first indoor heat exchanger 10 in sequence, and the temperature of the refrigerant flowing out of the second indoor heat exchanger 20 is adjusted by the first expansion valve, so that the temperature of the refrigerant flowing into the first indoor heat exchanger 10 is lower than the temperature of the refrigerant flowing into the second indoor heat exchanger 20. Like this, the fresh air carries out the heat exchange in order to realize once cooling through the refrigerant of the higher temperature in second indoor heat exchanger 20 and the second indoor heat exchanger 20 earlier, carries out the heat exchange in order to realize the secondary cooling through the refrigerant of the lower temperature in first indoor heat exchanger 10 and the first indoor heat exchanger 10 again to realize the step cooling of fresh air, it is effectual to cool down, and then is favorable to promoting air conditioning system's refrigeration efficiency.
As shown in fig. 2, the refrigerant line includes a parallel line for connecting the first indoor heat exchanger 10 and the second indoor heat exchanger 20 in parallel; the air conditioning indoor unit further includes a second expansion valve 40, a third expansion valve 50, and a switching valve group 60, the second expansion valve 40 is disposed on the parallel pipe and located at an upstream of the first indoor heat exchanger 10, the third expansion valve 50 is disposed on the parallel pipe and located at an upstream of the second indoor heat exchanger 20, so that a temperature difference exists between a temperature of the refrigerant flowing into the first indoor heat exchanger 10 and a temperature of the refrigerant flowing into the second indoor heat exchanger 20 through the third expansion valve 50 and the second expansion valve 40, and the switching valve group 60 is disposed on the refrigerant pipe, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are disposed in series or in parallel by adjusting an on-off state of the switching valve group 60.
In the first embodiment, as shown in fig. 2, when the air conditioning system is in the cooling mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are arranged in parallel, a portion of the refrigerant flowing out of the outdoor heat exchanger 70 of the outdoor unit of the air conditioning unit flows into the first port of the first indoor heat exchanger 10 through the second expansion valve 40, and the other portion of the refrigerant flows into the first port of the second indoor heat exchanger 20 through the third expansion valve 50, and the temperature of the refrigerant flowing into the first indoor heat exchanger 10 is lower than the temperature of the refrigerant flowing into the second indoor heat exchanger 20 by the cooperative control of the second expansion valve 40 and the third expansion valve 50. Like this, the fresh air carries out the heat exchange with the higher temperature refrigerant in the second indoor heat exchanger 20 in order to realize once cooling through second indoor heat exchanger 20 earlier, carries out the heat exchange with the refrigerant of the lower temperature in first indoor heat exchanger 10 in order to realize the secondary cooling through first indoor heat exchanger 10 again to realize the ladder cooling of fresh air, it is effectual to cool down, and then is favorable to promoting air conditioning system's refrigeration efficiency.
In an alternative embodiment of the present application, when the air conditioning system is in the heating mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are arranged in parallel, a portion of the refrigerant flowing out of the compressor 80 of the outdoor unit of the air conditioner flows into the second port of the first indoor heat exchanger 10 through the parallel line, and another portion of the refrigerant flows into the second port of the second indoor heat exchanger 20 through the parallel line, and the temperature of the refrigerant flowing into the first indoor heat exchanger 10 is higher than the temperature of the refrigerant flowing into the second indoor heat exchanger 20 by using the second expansion valve 40 and the third expansion valve 50 to perform coordinated control. Therefore, the fresh air firstly passes through the second indoor heat exchanger 20 to exchange heat with the refrigerant with lower temperature in the second indoor heat exchanger 20 so as to realize primary heating, and then passes through the first indoor heat exchanger 10 to exchange heat with the refrigerant with higher temperature in the first indoor heat exchanger 10 so as to realize secondary heating, so that the step heating of the fresh air is realized, the heating effect is good, and the heating efficiency of the air conditioning system is favorably improved.
As shown in fig. 1 and 2, the refrigerant pipeline includes a first common branch 101, a first serial branch 102 and a first parallel branch 103, a first end of the first common branch 101 communicates with a first port of the first indoor heat exchanger 10, a first end of the first serial branch 102 communicates with a second end of the first common branch 101, and a second end of the first serial branch 102 communicates with a second port of the second indoor heat exchanger 20, so as to form a serial pipeline through the first common branch 101 and the first serial branch 102; the first expansion valve 30 is disposed on the first serial branch 102, a first end of the first parallel branch 103 is communicated with a second end of the first common branch 101, and a second end of the first parallel branch 103 is used for being communicated with a second port of the outdoor heat exchanger 70 of the outdoor unit of the air conditioner, so as to form a parallel pipeline through the first common branch 101 and the first parallel branch 103; the second expansion valve 40 is provided on the first parallel branch 103; when the first serial branch 102 is in a conducting state and the first parallel branch 103 is in a disconnecting state, the refrigerant flowing out of the first interface of the first indoor heat exchanger 10 flows into the second interface of the second indoor heat exchanger 20 through the first serial branch 102; when the first parallel branch 102 is in the off state and the first parallel branch 103 is in the on state, the refrigerant flowing out of the outdoor heat exchanger 70 flows into the first interface of the first indoor heat exchanger 10 through the first parallel branch 103. In this way, the on/off states of the first common branch 101, the first series branch 102, and the first parallel branch 103 are adjusted by the switching valve group 60, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series or in parallel.
As shown in fig. 1 and 2, the switching valve group 60 includes a first three-way valve 61, a connection end a1 of the first three-way valve 61 is connected with the second end of the first common branch 101, a connection end F1 of the first three-way valve 61 is connected with the first end of the first series branch 102, and a connection end B1 of the first three-way valve 61 is connected with the first end of the first parallel branch 103; when the connection terminal a1 and the connection terminal F1 are in a conducting state, the first series branch 102 is in a conducting state, and the first parallel branch 103 is in a disconnecting state; when the connection terminal a1 and the connection terminal B1 are in a conducting state, the first series branch 102 is in a disconnected state, and the first parallel branch 103 is in a conducting state. In this way, the first indoor heat exchangers 10 and the second indoor heat exchangers 20 are connected in series or in parallel by adjusting the on/off state of the first common branch 101, the first series branch 102, and the first parallel branch 103 using one first three-way valve 61.
As shown in fig. 1 and 2, the refrigerant pipeline includes a second common branch 104, a second series branch 105 and a second parallel branch 106, a first end of the second common branch 104 is used for being connected with the compressor 80 of the outdoor unit of the air conditioner, a first end of the second series branch 105 is communicated with a second end of the second common branch 104, a second end of the second series branch 105 is communicated with a second port of the first indoor heat exchanger 10 to form a series pipeline through the second common branch 104 and the second series branch 105, a first end of the second parallel branch 106 is communicated with a second end of the second common branch 104, and a second end of the second parallel branch 106 is communicated with a second port of the second indoor heat exchanger 20 to form a parallel pipeline through the second common branch 104 and the second parallel branch 106; when the second series branch 105 is in a conducting state and the second parallel branch 106 is in a disconnecting state, the refrigerant discharged from the compressor 80 flows into the second interface of the first indoor heat exchanger 10 through the second series branch 105; when the second series branch 105 is in the off state and the second parallel branch 106 is in the on state, the refrigerant flowing out of the second port of the second indoor heat exchanger 20 flows into the compressor 80 through the second parallel branch 106. In this way, the on/off states of the second common branch 104, the second series branch 105, and the second parallel branch 106 are adjusted by the switching valve group 60, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series or in parallel.
As shown in fig. 1 and 2, the switching valve group 60 includes a second three-way valve 64, a connection end a2 of the second three-way valve 64 is connected with the second end of the second common branch 104, a connection end F2 of the second three-way valve 64 is connected with the first end of the second series branch 105, and a connection end B2 of the second three-way valve 64 is connected with the first end of the second parallel branch 106; when the connection terminal a2 and the connection terminal F2 are in a conducting state, the second series branch 105 is in a conducting state, and the second parallel branch 106 is in a disconnecting state; when the connection terminal a2 and the connection terminal B2 are in the on state, the second series branch 105 is in the off state, and the second parallel branch 106 is in the on state. In this way, the on/off states of the second common branch 104, the second series branch 105, and the second parallel branch 106 are adjusted by one second three-way valve 64, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series or in parallel.
In the alternative embodiment shown in fig. 1 and 2, the number of valve bodies in the switching valve group 60 is small, which is beneficial to improving the production efficiency of the air conditioner indoor unit and simplifying the control of the switching valve group 60.
As shown in fig. 1 and 2, the refrigerant pipeline further includes a third common branch 107, one end of the third common branch 107 is used for communicating with the second interface of the outdoor heat exchanger of the indoor unit of the air conditioner, the other end of the third common branch 107 is communicated with the first interface of the second indoor heat exchanger 20, the third expansion valve 50 is disposed on the third common branch 107, and the second expansion valve 40 is disposed on the first parallel branch 103; one end of the first parallel branch 103 communicates with the junction end B1 of the first three-way valve 61, the other end of the first parallel branch 103 communicates with the third common branch 107, and a connection point between the first parallel branch 103 and the third common branch 107 is located between the third expansion valve 50 and the second indoor heat exchanger.
In the embodiment shown in fig. 1, in the heating mode of the air conditioning system, the refrigerant flowing out of the first port of the first indoor heat exchanger 10 flows into the port a1 of the first three-way valve 61 through the first common branch 101, then flows into the first serial branch 102 through the port F1 of the first three-way valve 61, then flows into the first port of the second indoor heat exchanger 20 after being throttled by the first expansion valve 30 on the first serial branch 102, finally flows out of the first port of the second indoor heat exchanger 20 and flows into the second port of the outdoor heat exchanger 70 through the third common branch 107, meanwhile, the third expansion valve 50 on the third common branch 107 throttles the flowing refrigerant, and the refrigerant flowing out of the first port of the outdoor heat exchanger 70 is compressed by the compressor 80 and then flows into the port a2 of the second three-way valve 64 through the second common branch 104, and then flows back into the second port of the first indoor heat exchanger 10 through the port F2 of the second three-way valve 64, thereby realizing the circulation of the refrigerant.
As shown in fig. 1 and 2, the refrigerant pipeline further includes a fourth common branch 108, one end of the fourth common branch 108 is communicated with the second port of the first indoor heat exchanger 10, the other end of the fourth common branch 108 is selectively communicated with the suction port or the discharge port of the compressor 80, one end of the second series branch 105 is communicated with the port end F2 of the second three-way valve 64, and the other end of the second series branch 105 is communicated with the fourth common branch 108.
In the embodiment shown in fig. 2, the air conditioning system is in a cooling mode, a portion of the refrigerant flowing out of the outdoor heat exchanger 70 flows into the second indoor heat exchanger 20 through the third common branch 107, meanwhile, the third expansion valve 50 disposed on the third common branch 107 throttles the refrigerant passing therethrough, the throttled refrigerant flows into the first port of the second indoor heat exchanger 20 through the third common branch 107, then flows into the port B2 of the second three-way valve 64 through the second parallel branch 106, flows into the second common branch 104 through the port a2 of the second three-way valve 64, flows into the suction port of the compressor 80 through the second common branch 104, and the refrigerant discharged from the discharge port of the compressor 80 flows back into the first port of the outdoor heat exchanger 70, so as to implement a parallel cycle of the refrigerant; the other part of the refrigerant flowing out of the outdoor heat exchanger 70 flows into the joint end B1 of the first three-way valve 61 through the first parallel branch 103, and the second expansion valve 40 provided in the first parallel branch 103 throttles the refrigerant passing therethrough, and the throttled refrigerant flows into the first common branch 101 through the joint end a1 of the first three-way valve and flows into the first joint of the first indoor heat exchanger 10 through the first common branch 101, and the refrigerant flowing out of the second joint of the first indoor heat exchanger 10 flows into the suction port of the compressor 80 through the fourth common branch 108, and flows back into the first joint of the outdoor heat exchanger 70 through the discharge port of the compressor 80, thereby realizing another parallel circulation of the refrigerant.
As shown in fig. 1 and 2, the indoor unit of the air conditioner has an exhaust channel, and further includes a total heat exchanger 90, the total heat exchanger 90 is disposed at the upstream of the second indoor heat exchanger 20, and both the air intake channel and the exhaust channel flow through the total heat exchanger 90, so that the fresh air in the air intake channel exchanges heat with the return air in the exhaust channel; the air inlet channel comprises a first air inlet section positioned in the total heat exchanger 90 and a second air inlet section positioned on the downstream of the first air inlet section, the air exhaust channel comprises a first air exhaust section positioned in the total heat exchanger 90 and a second air exhaust section positioned on the upstream of the first air exhaust section, and the second air exhaust section is communicated with the second air inlet section. Thus, a part of return air enters the first air exhaust section through the second air exhaust section and exchanges heat with fresh air in the first air inlet section to realize the recovery of heat of the return air; the other part of return air enters the second air inlet section through the second air exhaust section, and is mixed with the fresh air discharged by the first air inlet section and subjected to heat exchange with the return air, and then the mixture is sent into a room. Like this, the air conditioning indoor unit that this application provided can send back partial return air to indoor again, has promoted the utilization ratio to the return air.
As shown in fig. 1 and 2, the air inlet channel includes a third air inlet section located at the upstream of the first air inlet section, and the indoor unit of the air conditioner further includes a first filter structure 100, where the first filter structure 100 is disposed on the third air inlet section. In this way, fresh air is filtered using the first filter structure 100.
As shown in fig. 1 and 2, the indoor unit of an air conditioner further includes a second filtering structure 110, the second filtering structure 110 is disposed on the second air intake section and is located at the upstream of the second indoor heat exchanger 20, and a connection point of the second air exhaust section and the second air intake section is located at the upstream of the second filtering structure 110. In this way, the fresh air is filtered by the second filter structure 110.
In the embodiment shown in fig. 1 and 2, fresh air is once filtered at the first filter structure 100. And secondary filtration is carried out at the second filtering structure 110, so that the filtering effect of the indoor unit of the air conditioner on fresh air is favorably improved.
In the embodiment shown in fig. 1 and 2, the fresh air and part of the return air after heat exchange with the return air are mixed, filtered by the second filtering structure 110, and then sequentially passed through the second indoor heat exchanger 20 and the first indoor heat exchanger 10 and then sent into the room.
As shown in fig. 1 and 2, the indoor unit of the air conditioner includes an indoor casing 120 and a partition structure 130, the indoor casing 120 has a receiving cavity, and an outdoor air inlet 121, an indoor air supply outlet 122, an indoor air return opening 123 and an outdoor air outlet 124 communicated with the receiving cavity, the partition structure 130 is disposed in the receiving cavity to partition the receiving cavity into a first chamber 131 communicated with the outdoor air inlet 121, a second chamber 132 communicated with the indoor air supply outlet 122, a third chamber 133 communicated with the indoor air return opening 123 and a fourth chamber 134 communicated with the outdoor air outlet 124; the total heat exchanger 90 and the third air inlet section are arranged in the first chamber 131, and the first indoor heat exchanger 10, the second indoor heat exchanger 20 and the second air inlet section are all arranged in the second chamber 132; the second exhaust section is arranged in the third chamber 133; the exhaust duct includes a third exhaust section downstream of the first exhaust section, the third exhaust section being disposed in the fourth chamber 134.
In specific implementation, fresh air enters the first chamber 131 through the outdoor air inlet 121, and then enters the first air inlet section in the total heat exchanger 90 after passing through the third air exhaust section and being filtered by the first filtering structure 100; the return air enters the third chamber 133 through the indoor return air inlet 123, and then a part of the return air enters the first exhaust section in the total heat exchanger 90 through the second exhaust section; the return air in the first air exhaust section and the fresh air in the first air inlet section are subjected to heat exchange, enter the fourth cavity 134 and are exhausted through the outdoor air outlet 124; the second air inlet section and the second air exhaust section are communicated with the second cavity, fresh air in the first air inlet section and return air in the first air exhaust section are subjected to heat exchange and then enter the second cavity 132 through the second air inlet section, the other part of the return air and the fresh air after the return air heat exchanger are mixed in the second cavity, and mixed air is sent into the room through the indoor air supply opening 122 after sequentially passing through the second filtering structure 110, the second indoor heat exchanger 20 and the first indoor heat exchanger 10.
In particular implementations, the first filter structure 100 is disposed within the first chamber 131 and the second filter structure 110 is disposed within the second chamber 132.
As shown in fig. 1 and fig. 2, the present application further provides an air conditioning system, which includes the above air conditioning indoor unit. The air conditioning system that this application provided has higher heating efficiency.
As shown in fig. 1 and 2, the air conditioning system has a heating mode, and the air conditioning system further includes an air conditioner outdoor unit including: the air conditioner comprises a compressor 80 and an outdoor heat exchanger 70, wherein the outdoor heat exchanger 70, the compressor 80, a first indoor heat exchanger 10 of an indoor air conditioner unit and a second indoor heat exchanger 20 of the indoor air conditioner unit are communicated through a refrigerant pipeline to realize the circulation of a refrigerant; the compressor 80 is a double suction single discharge compressor 80, the compressor 80 having a first suction port, a second suction port and a discharge port; a first four-way valve 141 and a second four-way valve 142, wherein a connection end D1 of the first four-way valve 141 and a connection end D2 of the second four-way valve 142 are both communicated with an exhaust port; a connection end E1 of the first four-way valve 141 is communicated with a second interface of the first indoor heat exchanger 10 of the indoor unit of the air conditioner, and a connection end E2 of the second four-way valve 142 is selectively communicated with the second interface of the first indoor heat exchanger 10; the connection end S1 of the first four-way valve 141 is communicated with the first suction port, and the connection end S2 of the second four-way valve 142 is communicated with the second suction port; the connection terminal C1 of the first four-way valve 141 and the connection terminal C2 of the second four-way valve 142 are both communicated with the first port of the outdoor heat exchanger 70, so that the refrigerant in the refrigerant pipeline flows into the series pipeline through the first four-way valve 141 and the second four-way valve 142. In this way, the first four-way valve 141 and the second four-way valve 142 are engaged to adjust the flow direction of the refrigerant, so that the air conditioning system is in a heating mode or a cooling mode, and the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series or in parallel by engaging the first four-way valve 141 and the second four-way valve 142.
In the embodiment shown in fig. 1, the air conditioning system is in a heating mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series, the refrigerant discharged from the discharge port of the compressor 80 sequentially flows into the second port of the first indoor heat exchanger 10 through the port end D1 and the port end E1 of the first four-way valve 141, then flows into the second indoor heat exchanger 20 through the first series branch 102, then flows into the second port of the outdoor heat exchanger 70 through the third common branch 107, a portion of the refrigerant flowing out of the first port of the outdoor heat exchanger 70 flows into the first suction port of the compressor 80 through the port end C1 and the port end S1 of the first four-way valve 141, and another portion of the refrigerant flowing out of the first port of the outdoor heat exchanger 70 flows into the second suction port of the compressor 80 through the port end C2 and the port end S2 of the second four-way valve 142.
In the embodiment shown in fig. 2, the air conditioning system is in a cooling mode, the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in parallel, a portion of the refrigerant discharged from the discharge port of the compressor 80 sequentially flows into the first port of the outdoor heat exchanger 70 through the port end D1 and the port end C1 of the first four-way valve 141, and another portion of the refrigerant discharged from the discharge port of the compressor 80 sequentially flows into the first port of the outdoor heat exchanger 70 through the port end D2 and the port end C2 of the second four-way valve 142; a part of the refrigerant flowing out of the second port of the outdoor heat exchanger 70 flows into the first port of the first indoor heat exchanger 10 through the first parallel branch 103 and the first common branch 101, and then flows out of the second port of the first indoor heat exchanger 10, flows into the port end E1 of the first four-way valve 141 through the fourth common branch 108, and flows into the first suction port of the compressor 80 through the port end S1 of the first four-way valve 141; another portion of the refrigerant flowing out of the second port of the outdoor heat exchanger 70 flows into the first port of the second indoor heat exchanger 20 through the third common branch 107, and then flows out of the second port of the second indoor heat exchanger 20, flows into the port E2 of the second four-way valve 142 through the second parallel branch 106 and the second common branch 104, and flows into the second suction port of the compressor 80 through the port S2 of the second four-way valve 142.
It should be noted that, in the present application, the serial pipeline refers to all pipelines that can realize refrigerant circulation when the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series; the parallel pipe lines refer to all pipe lines that can realize refrigerant circulation when the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in parallel.
Example two
The second embodiment differs from the first embodiment in that, as shown in fig. 3 and 4, the switching valve block 60 includes a first two-way valve 62 and a second two-way valve 63, the first two-way valve 62 being provided on the first serial branch 102, and the second two-way valve 63 being provided on the first parallel branch 103; when the first two-way valve 62 is in an on state and the second two-way valve 63 is in an off state, the first series branch 102 is in an on state, and the first parallel branch 103 is in an off state; when the second two-way valve 63 is in the on state and the second two-way valve 63 is in the on state, the first series branch 102 is in the on state, and the first parallel branch 103 is in the off state.
As shown in fig. 3 and 4, the switching valve block 60 includes a third two-way valve 65 and a fourth two-way valve 66, the third two-way valve 65 is disposed on the second serial branch 105, and the fourth two-way valve 66 is disposed on the second parallel branch 106; when the third two-way valve 65 is in an on state and the fourth two-way valve 66 is in an off state, the second series branch 105 is in an on state, and the second parallel branch 106 is in an off state; when the fourth two-way valve 66 is in the on state and the fourth two-way valve 66 is in the on state, the second series branch 105 is in the on state and the second parallel branch 106 is in the off state.
In the second embodiment, the first three-way valve 61 is replaced by the first two-way valve 62 and the second two-way valve 63, and the operation of the air-conditioning indoor unit and the air-conditioning system is not changed.
In the specific embodiment shown in fig. 3, the air conditioning system is in a heating mode, the first two-way valve 62 is in an on state, the second two-way valve 63 is in an off state, the third two-way valve 65 is in an on state, and the fourth two-way valve 66 is in an off state, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in series.
In the specific embodiment shown in fig. 4, the air conditioning system is in the cooling mode, the first two-way valve 62 is in the closed state, the second two-way valve 63 is in the open state, the third two-way valve 65 is in the closed state, and the fourth two-way valve 66 is in the open state, so that the first indoor heat exchanger 10 and the second indoor heat exchanger 20 are connected in parallel.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the application provides an air conditioning system adopts two carminative compressors 80 and two indoor heat exchangers of inhaling singly, structure to between two indoor heat exchangers is optimized, air conditioning system is parallel structure for two indoor heat exchangers under the mode of refrigeration, air conditioning system has two evaporating temperature, the new trend of pending passes through high temperature evaporator earlier, pass through low temperature evaporator again, compressor 80's average compression ratio is littleer, and then make air conditioning system's efficiency higher, air conditioning system is under the mode of heating, two indoor heat exchangers are the series connection structure, guarantee that refrigeration and heating are all in high energy efficiency state, the heat transfer effect of the first indoor heat exchanger 10 of leeward side is also better, air conditioning system's efficiency is higher.
Specifically, the evaporator with two different evaporation temperatures is used for refrigeration, fresh air sequentially passes through the high-temperature evaporator and the low-temperature evaporator, sensible heat and latent heat are separately processed, the average compression ratio of the double-suction single-exhaust compressor is smaller, and the system energy efficiency is higher. When heating, the air conditioner has two condensers with different condensing temperatures, fresh air sequentially passes through the medium-temperature condenser and the high-temperature condenser, the heat exchange effects of the two condensers are effectively exerted, and the system energy efficiency is higher.
Alternatively, the first filter structure 100 is a low efficiency screen and the second filter structure 110 is a high efficiency screen. The total heat exchanger 90 includes a total heat exchange core.
The application provides an air conditioning system is new trend air conditioning system, and air conditioning system includes machine in air condensing units and the air conditioning, and the machine is installed outdoors, and the machine is installed between indoor set or hides the installation at indoor furred ceiling in the air conditioning. The outdoor unit of the air conditioner is communicated with the indoor unit of the air conditioner through three connecting pipes, and the refrigerant circulates between the outdoor unit of the air conditioner and the indoor unit of the air conditioner through the connecting pipes to form the circulating flow of the refrigerant.
Alternatively, the outdoor unit of the air conditioner further includes an outdoor casing 150, and the compressor 80 and the outdoor heat exchanger are disposed in the outdoor casing 150.
Optionally, the distance between the air duct opening of the outdoor air inlet 121 and the air duct opening of the outdoor air outlet 124 needs to be kept over 1 meter, and the opening directions are opposite, so that short circuit between outdoor air exhaust and indoor air inlet is avoided, and the exhaust air is prevented from being directly sucked into the indoor space.
Alternatively, the second expansion valve 40 and the third expansion valve 50 are both electronic expansion valves.
In the cooling mode, the outdoor heat exchanger 70 is a condenser, the high-pressure liquid refrigerant from the condenser enters the second expansion valve 40 and the third expansion valve 50 respectively and is throttled into a low-temperature low-pressure two-phase refrigerant, and the temperature and the pressure of the two-phase refrigerant from the second expansion valve 40 are lower than those of the two-phase refrigerant from the third expansion valve 50 by controlling the throttling effect of the electronic expansion valve, so that two evaporating temperatures exist at the evaporating side of the refrigerant system. The two-phase refrigerant discharged from the second expansion valve 40 enters the first indoor heat exchanger 10, which is a low-temperature evaporator, to be heat-absorbed and evaporated, and the gaseous refrigerant discharged from the low-temperature evaporator passes through the connection end E1 and the connection end S1 of the first four-way valve 141, is sucked into the first gas-liquid separator of the double suction compressor, and is then compressed again. The two-phase refrigerant discharged from the third expansion valve 50 enters the second indoor heat exchanger 20, which is a high temperature evaporator, to be heat-absorbed and evaporated, and the gaseous refrigerant discharged from the high temperature evaporator passes through the connection end E2 and the connection end S2 of the second four-way valve 142, is sucked into the second gas-liquid separator of the double suction compressor, and is then compressed again. The compressed high-temperature and high-pressure gaseous refrigerant is discharged from the compressor 80 again after being merged at the discharge port and enters the connection end D1 of the first four-way valve 141 and the connection end D2 of the second four-way valve 142, respectively, completing the entire refrigerant cycle.
The refrigerant circulation has two evaporation temperatures, so that the evaporation pressure of the refrigerant in the high-temperature evaporator is higher, and the compression ratio is smaller. Compared with a single-evaporation-temperature refrigerant circulating system, the refrigerant circulating system with double evaporation temperatures has smaller average compression ratio and higher system energy efficiency. When fresh air passes through the high-temperature evaporator, the temperature is only reduced, and the moisture content is not reduced; when the fresh air passes through the low-temperature evaporator, the temperature and the moisture content are both reduced. For fresh air, the temperature and humidity control process is adopted.
In the refrigeration mode, outdoor fresh air enters the total heat exchange core after being filtered by the primary filter screen, and in the total heat exchange core, the outdoor fresh air with high temperature and high humidity and the indoor return air with low temperature and low humidity carry out heat and humidity exchange, so that the temperature and the moisture content of the fresh air are reduced, and the temperature and the moisture content of the return air are increased. The new trend and the partial return air that come out from the total heat exchange core body mix, pass through high temperature evaporator after being filtered by high-efficient filter screen, high temperature evaporator's evaporating temperature is higher, be higher than the dew point temperature of the new trend that comes out from the total heat exchange core body promptly, the new trend is behind high temperature evaporator, the temperature reduces and the moisture content is unchangeable, the new trend that comes out from high temperature evaporator passes through low temperature evaporator cooling dehumidification, the temperature further reduces, the moisture content descends, adjust the evaporating temperature of low temperature evaporator through the throttle effect of adjusting second expansion valve 40, make the new trend that comes out from low temperature evaporator reach the air supply requirement, and send into indoor. In the air mixing mode, indoor return air is divided into two parts, one part of the indoor return air and fresh air are discharged outdoors after heat and humidity exchange is carried out on the total heat exchange core, and the other part of the indoor return air and the fresh air coming out of the total heat exchange core are mixed and then are sent indoors again after sequentially passing through the high-efficiency filter screen, the high-temperature evaporator and the low-temperature evaporator.
In the heating mode, the first indoor heat exchanger 10 is a high-temperature condenser, the corresponding condensing temperature is T1, the refrigerant is throttled to an intermediate pressure by the first expansion valve 30, and then enters the second indoor heat exchanger 20, i.e., a medium-temperature condenser, the corresponding condensing temperature is T2, wherein T2 is less than T1, the medium-temperature medium-pressure liquid refrigerant coming out of the second indoor heat exchanger 20 enters the third expansion valve 50, and is throttled to a low-temperature low-pressure two-phase refrigerant. The two-phase refrigerant from the third expansion valve 50 enters the outdoor heat exchanger 70, i.e., the evaporator, to be subjected to heat absorption and evaporation, the gaseous refrigerant from the outdoor heat exchanger 70 is divided into two paths, and the two paths of refrigerant respectively pass through the connection end C1 and the connection end S1 of the first four-way valve 141 and the connection end C2 and the connection end S2 of the second four-way valve 142, are sucked into the first gas-liquid separator and the second gas-liquid separator of the double suction single discharge compressor, and are compressed again. The compressed high-temperature and high-pressure gaseous refrigerant is discharged from the discharge port and then enters the connection end D1 of the first four-way valve 141 and the connection end D2 of the second four-way valve 142, respectively, thereby completing the whole refrigerant cycle.
In the heating mode, the compressor discharge gas is discharged into the first indoor heat exchanger 10, i.e., the high-temperature condenser, throttled to an intermediate pressure by the first expansion valve 30, and then enters the second indoor heat exchanger 20, i.e., the medium-temperature condenser, so that the refrigerant system has two condensing temperatures.
In the heating mode, outdoor fresh air enters the total heat exchange core after being filtered by the primary filter screen, and in the total heat exchange core, the low-temperature and low-humidity outdoor fresh air and the high-temperature and high-humidity indoor return air are subjected to heat and humidity exchange, so that the temperature and the moisture content of the fresh air are increased, and the temperature and the moisture content of the return air are reduced. Fresh air from the total heat exchange core is mixed with part of return air, the mixture is filtered by a high-efficiency filter screen and then sequentially passes through a second indoor heat exchanger 20, namely a medium-temperature condenser, and a first indoor heat exchanger 10, namely a high-temperature condenser, and when the mixture passes through the second indoor heat exchanger 20, the temperature of the fresh air is heated to a temperature near T2; after the fresh air passes through the first indoor heat exchanger 10, the temperature of the fresh air is further heated to a temperature near T1, the heating process of the fresh air is a temperature gradient rising process, the heat exchange temperature difference between the fresh air and the two condensers is large, the heat exchange effect is high, and the energy efficiency of the whole system is improved. By adjusting the throttling effect of the first expansion valve 30 and the third expansion valve 50, the condensing temperatures T2 and T1 can be adjusted, so that the fresh air coming out of the first indoor heat exchanger 10 meets the requirement of the air supply temperature and is sent into the room. In the air mixing mode, the indoor return air is divided into two parts, one part of the indoor return air and the fresh air are discharged outdoors after heat-moisture exchange is carried out on the total heat exchange core, and the other part of the indoor return air and the fresh air coming out of the total heat exchange core are mixed and then are sent indoors again after sequentially passing through the high-efficiency filter screen, the second indoor heat exchanger 20 and the first indoor heat exchanger 10.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. An indoor unit of an air conditioner is characterized in that the indoor unit of the air conditioner is provided with an air inlet channel; the air-conditioning indoor unit comprises:
the first indoor heat exchanger (10), the said first indoor heat exchanger (10) is set up on the said air intake channel;
a second indoor heat exchanger (20), the second indoor heat exchanger (20) being disposed on the air intake passage and upstream of the first indoor heat exchanger (10); the first indoor heat exchanger (10) and the second indoor heat exchanger (20) are communicated through a refrigerant pipeline, and the refrigerant pipeline comprises a serial pipeline for connecting the first indoor heat exchanger (10) and the second indoor heat exchanger (20) in series; the refrigerant pipeline comprises a parallel pipeline for connecting the first indoor heat exchanger (10) and the second indoor heat exchanger (20) in parallel;
a first expansion valve (30), the first expansion valve (30) being disposed on the serial line and between the first indoor heat exchanger (10) and the second indoor heat exchanger (20);
a second expansion valve (40), the second expansion valve (40) being disposed on the parallel pipe and upstream of the first indoor heat exchanger (10);
a third expansion valve (50), the third expansion valve (50) being disposed on the parallel pipe and upstream of the second indoor heat exchanger (20), so that a temperature difference exists between a temperature of the refrigerant flowing into the first indoor heat exchanger (10) and a temperature of the refrigerant flowing into the second indoor heat exchanger (20) by the third expansion valve (50) and the second expansion valve (40);
and the switching valve group (60) is arranged on the refrigerant pipeline, so that the first indoor heat exchanger (10) and the second indoor heat exchanger (20) are arranged in series or in parallel by adjusting the on-off condition of the switching valve group (60).
2. An indoor unit of an air conditioner according to claim 1, wherein the refrigerant pipe includes:
a first common branch (101), wherein a first end of the first common branch (101) is communicated with a first interface of the first indoor heat exchanger (10);
a first series branch (102), a first end of the first series branch (102) being in communication with a second end of the first common branch (101), a second end of the first series branch (102) being in communication with a second port of the second indoor heat exchanger (20) to form the series line through the first series branch (102); the first expansion valve (30) is arranged on the first series branch (102);
a first parallel branch (103), wherein a first end of the first parallel branch (103) is communicated with a second end of the first common branch (101), and a second end of the first parallel branch (103) is used for being communicated with a second interface of an outdoor heat exchanger (70) of an air conditioner outdoor unit, so that the parallel pipeline is formed by the first parallel branch (103); the second expansion valve (40) is arranged on the first parallel branch (103);
when the first serial branch (102) is in a conducting state and the first parallel branch (103) is in a disconnecting state, the refrigerant flowing out of the first interface of the first indoor heat exchanger (10) flows into the second interface of the second indoor heat exchanger (20) through the first serial branch (102); when the first series branch (102) is in an off state and the first parallel branch (103) is in an on state, the refrigerant flowing out of the outdoor heat exchanger (70) flows into the first interface of the first indoor heat exchanger (10) through the first parallel branch (103).
3. The air conditioning indoor unit of claim 2, wherein the switching valve group (60) comprises:
a first three-way valve (61), the connection end a1 of the first three-way valve (61) being connected to the second end of the first common branch (101), the connection end F1 of the first three-way valve (61) being connected to the first end of the first series branch (102), the connection end B1 of the first three-way valve (61) being connected to the first end of the first parallel branch (103);
wherein, when the connection terminal A1 and the connection terminal F1 are in a conducting state, the first series branch (102) is in a conducting state, and the first parallel branch (103) is in an off state; when the connection terminal A1 and the connection terminal B1 are in a conducting state, the first series branch (102) is in a disconnected state, and the first parallel branch (103) is in a conducting state.
4. The air conditioning indoor unit of claim 2, wherein the switching valve group (60) comprises:
a first two-way valve (62), the first two-way valve (62) disposed on the first series branch (102);
a second two-way valve (63), the second two-way valve (63) being disposed on the first parallel branch (103);
wherein when the first two-way valve (62) is in an on state and the second two-way valve (63) is in an off state, the first series branch (102) is in an on state and the first parallel branch (103) is in an off state; when the second two-way valve (63) is in an on state and the second two-way valve (63) is in an on state, the first series branch (102) is in an on state and the first parallel branch (103) is in an off state.
5. An indoor unit of an air conditioner according to any one of claims 1 to 4, wherein the refrigerant pipe includes:
a second common branch (104), wherein a first end of the second common branch (104) is used for being connected with a compressor (80) of an air conditioner outdoor unit;
a second series branch (105), a first end of the second series branch (105) being in communication with a second end of the second common branch (104), a second end of the second series branch (105) being in communication with a second interface of the first indoor heat exchanger (10) to form the series line through the second series branch (105);
a second parallel branch (106), a first end of the second parallel branch (106) is communicated with a second end of the second common branch (104), and a second end of the second parallel branch (106) is communicated with a second interface of the second indoor heat exchanger (20) to form the parallel pipeline through the second parallel branch (106);
when the second series branch (105) is in a conducting state and the second parallel branch (106) is in a disconnecting state, the refrigerant discharged by the compressor (80) flows into the second interface of the first indoor heat exchanger (10) through the second series branch (105); when the second series branch (105) is in an off state and the second parallel branch (106) is in an on state, the refrigerant flowing out of the second port of the second indoor heat exchanger (20) flows into the compressor (80) through the second parallel branch (106).
6. The air conditioning indoor unit of claim 5, wherein the switching valve group (60) comprises:
a second three-way valve (64), the connection end A2 of the second three-way valve (64) being connected to the second end of the second common branch (104), the connection end F2 of the second three-way valve (64) being connected to the first end of the second series branch (105), the connection end B2 of the second three-way valve (64) being connected to the first end of the second parallel branch (106);
wherein, when the connection terminal A2 and the connection terminal F2 are in a conducting state, the second series branch (105) is in a conducting state, and the second parallel branch (106) is in a disconnected state; when the connection terminal a2 and the connection terminal B2 are in a conducting state, the second series branch (105) is in a disconnected state, and the second parallel branch (106) is in a conducting state.
7. The air conditioning indoor unit of claim 5, wherein the switching valve group (60) comprises:
a third two-way valve (65), the third two-way valve (65) disposed on the second series branch (105);
a fourth two-way valve (66), the fourth two-way valve (66) disposed on the second parallel branch (106);
wherein when the third two-way valve (65) is in an on state and the fourth two-way valve (66) is in an off state, the second series branch (105) is in an on state and the second parallel branch (106) is in an off state; when the fourth two-way valve (66) is in an on state and the fourth two-way valve (66) is in an on state, the second series branch (105) is in an on state, and the second parallel branch (106) is in an off state.
8. The indoor unit of claim 1, wherein the indoor unit has a discharge duct, and further comprising:
the total heat exchanger (90) is arranged at the upstream of the second indoor heat exchanger (20), and the air inlet channel and the air exhaust channel both flow through the total heat exchanger (90) so that fresh air in the air inlet channel and return air in the air exhaust channel exchange heat;
the air inlet channel comprises a first air inlet section and a second air inlet section, the first air inlet section is located in the total heat exchanger (90), the second air inlet section is located on the downstream of the first air inlet section, the air exhaust channel comprises a first air exhaust section and a second air exhaust section, the first air exhaust section is located in the total heat exchanger (90), the second air exhaust section is located on the upstream of the first air exhaust section, and the second air exhaust section is communicated with the second air inlet section.
9. The indoor unit of claim 8, wherein the air intake passage includes a third air intake section located upstream of the first air intake section, and the indoor unit further comprises:
a first filter structure (100), wherein the first filter structure (100) is arranged on the third air inlet section; and/or
And the second filtering structure (110) is arranged on the second air inlet section and is positioned at the upstream of the second indoor heat exchanger (20), and the communication point of the second air exhaust section and the second air inlet section is positioned at the upstream of the second filtering structure (110).
10. An indoor unit of an air conditioner according to claim 9, comprising:
the indoor unit comprises an indoor machine shell (120), wherein the indoor machine shell (120) is provided with a containing cavity, and an outdoor air inlet (121), an indoor air supply outlet (122), an indoor air return inlet (123) and an outdoor air outlet (124) which are communicated with the containing cavity;
the separation structure (130) is arranged in the accommodating cavity to separate the accommodating cavity into a first cavity (131) communicated with the outdoor air inlet (121), a second cavity (132) communicated with the indoor air supply outlet (122), a third cavity (133) communicated with the indoor air return opening (123) and a fourth cavity (134) communicated with the outdoor air outlet (124);
wherein the total heat exchanger (90) and the third air intake section are arranged in the first chamber (131), and the first indoor heat exchanger (10), the second indoor heat exchanger (20) and the second air intake section are all arranged in the second chamber (132); the second exhaust section is arranged in the third chamber (133); the exhaust duct includes a third exhaust section downstream of the first exhaust section, the third exhaust section being disposed within the fourth chamber (134).
11. An air conditioning system characterized by comprising an indoor unit of an air conditioner according to any one of claims 1 to 10.
12. The system of claim 11, wherein the air conditioning system has a heating mode, the air conditioning system further comprising an outdoor unit, the outdoor unit comprising:
the air conditioner indoor unit comprises a compressor (80) and an outdoor heat exchanger (70), wherein the outdoor heat exchanger (70), the compressor (80), a first indoor heat exchanger (10) of the air conditioner indoor unit and a second indoor heat exchanger (20) of the air conditioner indoor unit are communicated through a refrigerant pipeline to realize the circulation of a refrigerant; the compressor (80) is a double-suction single-row compressor (80), and the compressor (80) is provided with a first suction port, a second suction port and an exhaust port;
a first four-way valve (141) and a second four-way valve (142), wherein a connection end D1 of the first four-way valve (141) and a connection end D2 of the second four-way valve (142) are both communicated with the exhaust port; a connection end E1 of the first four-way valve (141) is communicated with a second interface of a first indoor heat exchanger (10) of the indoor unit of the air conditioner, and a connection end E2 of the second four-way valve (142) is selectively communicated with the second interface of the first indoor heat exchanger (10); a connection end S1 of the first four-way valve (141) is communicated with the first suction port, and a connection end S2 of the second four-way valve (142) is communicated with the second suction port; a connection end C1 of the first four-way valve (141) and a connection end C2 of the second four-way valve (142) are both communicated with a first port of the outdoor heat exchanger (70), so that the refrigerant in the refrigerant pipeline flows into a serial pipeline through the first four-way valve (141) and the second four-way valve (142).
CN201911425458.0A 2019-12-31 2019-12-31 Air conditioner indoor unit and air conditioning system Active CN111059630B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010203685A (en) * 2009-03-03 2010-09-16 Mitsubishi Electric Corp Air conditioning device and method for controlling the same
CN104896637A (en) * 2015-05-30 2015-09-09 华为技术有限公司 Light-load dehumidification and refrigeration method and device
JP2016223638A (en) * 2015-05-27 2016-12-28 株式会社富士通ゼネラル Duct type air conditioner
CN207962898U (en) * 2018-01-30 2018-10-12 广东美的制冷设备有限公司 Air conditioner indoor unit and air conditioner with it

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010203685A (en) * 2009-03-03 2010-09-16 Mitsubishi Electric Corp Air conditioning device and method for controlling the same
JP2016223638A (en) * 2015-05-27 2016-12-28 株式会社富士通ゼネラル Duct type air conditioner
CN104896637A (en) * 2015-05-30 2015-09-09 华为技术有限公司 Light-load dehumidification and refrigeration method and device
CN207962898U (en) * 2018-01-30 2018-10-12 广东美的制冷设备有限公司 Air conditioner indoor unit and air conditioner with it

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