CN115095916A - Air conditioner main unit with fixed frequency conversion double refrigeration loops and external heat exchanger arranged oppositely - Google Patents

Abstract

The invention provides an air-conditioning host which adopts a fixed-frequency and variable-frequency double-refrigeration loop and is oppositely provided with an outer heat exchanger, and the air-conditioning host comprises a shell, and a variable-frequency compressor, a fixed-frequency compressor, an inner heat exchanger and an outer heat exchanger module which are arranged in the shell, wherein the inner heat exchanger is a three-channel plate heat exchanger, three channels of the three heat exchanger are respectively a waterway channel, a first refrigerant channel and a second refrigerant channel, and when the air-conditioning host runs, the refrigerant in the first refrigerant channel or/and the second refrigerant channel exchanges heat with water or solution in the waterway channel; the outer heat exchanger module comprises at least two outer heat exchangers which are oppositely arranged and are respectively arranged at the left side and the right side in the shell, and each outer heat exchanger comprises a first refrigerant pipeline and a second refrigerant pipeline; the variable frequency compressor, the first refrigerant pipeline, the first throttling device and the first refrigerant channel are in circulating connection to form a variable frequency compressor refrigerating circuit, and the fixed frequency compressor, the second refrigerant pipeline, the second throttling device and the second refrigerant channel are in circulating connection to form a fixed frequency compressor refrigerating circuit.

Description

Air conditioner main unit with fixed frequency conversion double refrigeration loops and external heat exchanger arranged oppositely

Technical Field

The invention belongs to the technical field of air conditioner host systems, and particularly relates to an air conditioner host which adopts fixed-frequency and variable-frequency double refrigeration loops and is oppositely provided with an external heat exchanger.

Background

Compared with the split air conditioner, the indoor unit embedded in the suspended ceiling is clean and tidy, and is popular and sought after in the house decoration, even as the representative configuration of high-end houses; the variable frequency compressor is a major breakthrough in the technical field of refrigeration, and due to the adjustability of the refrigerating capacity of the displacement, the wide load adaptability of the refrigerating system is brought, and the variable frequency compressor is widely applied to household central air-conditioning systems with variable load characteristics.

However, in a household central air-conditioning system, under a low-load condition, the variable frequency compressor runs at a low frequency and a low speed, a plurality of efficiencies such as motor efficiency, volumetric efficiency, mechanical efficiency and the like are reduced, the reduction amplitude of the pressure difference of the inlet and the outlet of the compressor is smaller due to smaller changes of condensation pressure (mainly determined by high-temperature heat source temperature) and evaporation pressure (mainly determined by low-temperature heat source temperature), and the leakage rate of a refrigerant at the low-pressure side is not changed greatly through a gap of a moving surface of an air cylinder at the high-pressure side so that the leakage rate is greatly increased under the low-load condition; due to the change of all the factors, the total efficiency (effective compression work/total electric work of the compressor) of the compressor, which is a composite function of motor efficiency, volumetric efficiency, mechanical efficiency, leakage rate and the like, is greatly reduced, so that the overall system of the air conditioner under the condition of low load has low efficiency; generally, the efficiency of the inverter compressor can reach 70% at the highest near 50% load, and the corresponding refrigeration energy efficiency ratio EER of the refrigeration system reaches more than 4.5; in the vicinity of 10% load, the efficiency of the variable frequency compressor is reduced to about 45% of the highest point, and the EER of the system is reduced to below 2.0; please refer to fig. 1.

Referring to fig. 2, it can be seen from the actual load factor distribution survey of the household central air conditioners that the load factors of most household central air conditioners are very low when the load factors are 50% or more, and are high when the load factors are less than 30%; this is because the bedrooms in a home house are usually not full of air, only the rooms where people are sleeping are operated at night, and the air-conditioning indoor units in the public spaces such as the unpopular rooms and the guest dining rooms are stopped.

Therefore, the key point of reducing the actual energy consumption of the household central air-conditioning system is to improve the energy efficiency of the household central air-conditioning system in the load operation time period below 30%.

Disclosure of Invention

In order to solve the problems, the invention provides an air-conditioning host which adopts a fixed-frequency and variable-frequency double refrigeration loop and is oppositely provided with an external heat exchanger, and the air-conditioning host comprises a shell, and a variable-frequency compressor, a fixed-frequency compressor, an internal heat exchanger and an external heat exchanger module which are arranged in the shell, wherein the internal heat exchanger is a three-channel plate heat exchanger, three channels of the three-channel plate heat exchanger are respectively a waterway channel, a first refrigerant channel and a second refrigerant channel, and when the air-conditioning host runs, refrigerants in the first refrigerant channel or/and the second refrigerant channel exchange heat with water or solution in the waterway channel;

the outer heat exchanger module comprises at least two outer heat exchangers which are oppositely arranged and are respectively arranged at the left side and the right side in the shell, and each outer heat exchanger comprises a first refrigerant pipeline and a second refrigerant pipeline;

the variable frequency compressor, the first refrigerant pipeline, the first throttling device and the first refrigerant channel are in circulating connection to form a variable frequency compressor refrigerating circuit, and the fixed frequency compressor, the second refrigerant pipeline, the second throttling device and the second refrigerant channel are in circulating connection to form a fixed frequency compressor refrigerating circuit.

Preferably, the outer heat exchanger module further comprises at least one fan, the fan is disposed between the outer heat exchangers which are oppositely disposed, both sides of the fan are provided with air suction ports, and the two air suction ports face the outer heat exchangers on both sides respectively;

the left side and the right side of the shell are respectively provided with an air inlet corresponding to the outer heat exchanger; the front side of the shell is provided with an air outlet;

when the heat exchanger is operated, the fan is started, the air suction ports on the two sides of the fan generate a negative pressure area, pressure difference is generated between the inside and the outside of the outer heat exchanger on the two sides of the fan, ambient air is pulled to respectively penetrate through the gaps of the fins of the outer heat exchanger from the air inlets on the left side and the right side of the shell, the ambient air is sucked by the fan after heat exchange is completed, and the ambient air is injected into the outer heat exchanger from the air outlet of the shell at a high speed after the ambient air is boosted.

Preferably, the fan is a double-suction forward-inclined multi-wing centrifugal fan.

Preferably, a plurality of the fans are arranged between the outer heat exchangers which are oppositely arranged, and the fans are arranged up and down.

Preferably, the waterway channel, the first refrigerant channel and the second refrigerant channel of the three-channel plate heat exchanger are arranged in a mutually sealed mode.

Preferably, the air conditioner main unit adopts a fixed frequency and variable frequency double refrigeration loop and an external heat exchanger arranged oppositely, and when in operation, the flow direction of water or solution in the water channel is opposite to or the same as the flow direction of refrigerant in the first refrigerant channel or/and the second refrigerant channel.

Preferably, the three-channel plate heat exchanger comprises a plurality of heat exchange plates which are sequentially overlapped, a plurality of water channel sub-channels, a plurality of first refrigerant sub-channels and a plurality of second refrigerant sub-channels are formed among the plurality of heat exchange plates, and the plurality of first refrigerant sub-channels and the plurality of second refrigerant sub-channels are arranged alternately through the plurality of water channel sub-channels; a waterway inlet, a waterway outlet, a first refrigerant inlet, a first refrigerant outlet, a second refrigerant inlet and a second refrigerant outlet are respectively arranged on the heat exchange plates;

the plurality of waterway sub-channels are respectively communicated with the water inlet main channel and the water outlet main channel to form the waterway channels;

the plurality of first refrigerant inlets are sequentially communicated to form a first system refrigerant main channel, the plurality of first refrigerant outlets are sequentially communicated to form a first refrigerant main outlet channel, and the plurality of first refrigerant branch channels are respectively communicated with the first system refrigerant main channel and the first refrigerant main outlet channel to form the first refrigerant channel;

the plurality of second refrigerant inlets are sequentially communicated to form a second system refrigerant main channel, the plurality of second refrigerant outlets are sequentially communicated to form a second refrigerant main channel, and the plurality of second refrigerant branch channels are respectively communicated with the second system refrigerant main channel and the second refrigerant main channel to form the second refrigerant channel.

Preferably, the water inlet main channel and the water outlet main channel are located at two ends of the plurality of water path sub-channels, the first system refrigerant main channel and the first refrigerant outlet main channel are located at two ends of the plurality of first refrigerant sub-channels, and the second system refrigerant main channel and the second refrigerant outlet main channel are located at two ends of the second refrigerant sub-channels.

Preferably, the heat exchanger plate comprises a brazing zone and a corrugated zone, the two ends of the corrugated zone are brazing zones, the corrugated zone has ridges and valleys, and the water path inlet, the water path outlet, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet and the second refrigerant outlet are located in the brazing zone.

Preferably, the rated motor power of the air conditioner host complete machine is set to be P, the rated refrigerating capacity is set to be Q, and the rated motor power and the rated refrigerating capacity of the fixed-frequency compressor and the variable-frequency compressor are respectively set to be 0.5 times of the rated motor power P and the rated refrigerating capacity Q of the air conditioner host complete machine:

when the load factor of the air conditioner main machine is less than 0.5, the variable frequency compressor refrigeration loop is operated, and the fixed frequency compressor refrigeration loop is not operated;

and when the load factor of the air conditioner main machine is more than 0.5, the variable-frequency compressor refrigeration loop and the fixed-frequency compressor refrigeration loop run simultaneously.

Compared with the prior art, the invention has the following technical effects:

the high energy efficiency operation range of the air conditioning system is greatly expanded

The invention reduces the rated electric power and the rated refrigerating capacity (heating capacity) of the variable frequency compressor by the output combination of the two refrigerating loops driven by the fixed variable frequency compressor, so that the high-energy-efficiency operation range of the variable frequency compressor covers the complete machine 'minimum load' with only 1 fan coil operating indoors, and the high-energy-efficiency operation range of the air conditioning system is greatly expanded.

The refrigerating capacity (heating capacity) of the whole air conditioner host machine is set to be Q, the rated refrigerating capacity (heating capacity) of the fixed-frequency compressor and the rated refrigerating capacity (heating capacity) of the inverter compressor are both set to be about 0.5 times of the rated refrigerating capacity (heating capacity) Q of the whole air conditioner host machine, when the load factor of the whole air conditioner host machine is in a lower state, for example, the load factor of the whole air conditioner host machine is 0.2, the refrigerating circuit of the fixed-frequency compressor is stopped, only the refrigerating circuit of the inverter compressor is operated, the output of the 0.2Q of the whole air conditioner host machine is equivalent to 40% of the rated refrigerating capacity (heating capacity) 0.5Q of the inverter compressor, and the air conditioner host machine is positioned in a high energy efficiency period of 30% -80% of the inverter compressor.

The end of an actual household central air-conditioning system comprises a plurality of room fan coils, the lowest load of the whole machine is the refrigerating capacity (heating capacity) of 1 fan coil, the lowest load is equivalent to the quantum concept of quantum mechanics, the rated load of the whole machine is about 1/7 (15%) to 1/4 (25%), and the energy requirement below the rated load of the whole machine is generally not present under 1/7; even under the condition that the load factor of the whole machine is 0.15(1/7), the embodiment only operates the refrigerating circuit of the inverter compressor, the output of the whole machine 0.15Q is equivalent to 30% of the rated refrigerating capacity (heating capacity) 0.5Q of the inverter compressor, and the output is still positioned in the high energy efficiency period of 30% -80% of the rated refrigerating capacity (heating capacity) of the inverter compressor.

Compared with a household central air conditioner driven by a single high-power variable-frequency compressor, the embodiment reduces the cylinder capacity and the rated refrigerating capacity of the variable-frequency compressor by combining 2 compressors one by one, realizes the coverage of a high-energy efficiency area of the whole air conditioner to a low-load rate (for example, about 15 percent, only one fan coil is operated) area, and solves the problem of low-energy efficiency operation of a user of the household central air conditioner, wherein the time accounts for more than 50 percent, and the load rate of a main machine is less than 30 percent.

High energy efficiency and high energy efficiency for keeping variable load operation

The invention supports the variable load operation of the air conditioner main unit and keeps high energy efficiency and higher energy efficiency under various loads (part or all of indoor fan coil operation).

When the load factor of the whole machine is in a lower state (less than 0.5), the constant-frequency compressor refrigeration circuit is shut down, and only the variable-frequency compressor refrigeration circuit is operated, wherein the variable-frequency compressor is in a period of 30% -100% high energy efficiency, which is equivalent to 15% -50% of the load factor of the whole machine;

when the load factor of the whole machine is in a higher state (more than 0.5), two refrigeration loops respectively driven by 2 compressors with fixed frequency and variable frequency are operated, the full load 0.5Q output of the fixed frequency compressor and the 0.5Q multiplied by x% output of the variable frequency compressor are combined to meet the requirements of the output and the energy efficiency of the whole machine, and x% is the load factor of the variable frequency compressor.

The invention adopts the outer heat exchanger modules with the heat exchangers oppositely arranged, and has the following advantages:

1. radically improves the path, power and efficiency of the air path of the air conditioner external heat exchanger module

The invention fundamentally changes the space structure relationship of the traditional household air conditioner external fan at the front and the back of the external heat exchanger, and the air conditioner external heat exchanger module is disassembled into two heat exchangers which are oppositely arranged left and right, and the external fan is arranged between the left and right heat exchangers; the forward-inclined multi-wing centrifugal fan adopts a double-suction-port structure, and the double suction ports of the fan point to the outer heat exchangers on two sides;

aiming at a high-power or high-power air conditioner host, the air path parallel connection mode of a plurality of double-suction-port fans is adopted, the air conditioner outer heat exchanger module is provided with suction ports with the quantity 2 times that of the fans, and the airflow is more uniform when the negative pressure dot matrix generated by the suction ports with the quantity 2 times that of the fans drives the environmental airflow to pass through the outer heat exchangers on two sides;

the forward-inclined multi-wing centrifugal fan is adopted to replace the traditional axial flow fan, and the air pressure at the outlet of the fan is lower than that of a backward-inclined centrifugal fan and higher than that of the axial flow fan;

the invention also adopts the low-level strip-shaped air outlet, reduces the sectional area of the air outlet, and improves the speed, the range and the diffusion effect of the air outlet of the air conditioner host machine which is emitted into the ambient atmosphere;

in conclusion, the invention fundamentally improves the path, power and efficiency of the air path of the air conditioner external heat exchanger module.

2. The relation between the air conditioner main unit and the outer vertical surface of the building is optimized

The space relationship between the traditional air conditioner and a building is difficult to coordinate: a big cake face air-conditioning host machine with one color being clear is erected on equipment platforms on the upper line and the lower line of the high-rise building, the right half part (or the left half part) of a white cake face is an axial flow fan with a row of black holes on the upper line and the lower line, and the visual effect is poor; if the air conditioner is shielded by adopting decorative means such as a shutter and the like, the air outlet resistance of the air conditioner main machine is increased, the air volume is reduced and the air flow is short-circuited.

The external heat exchanger modules arranged opposite to the heat exchanger are adopted, so that the structural relationship between the heat exchanger and the fan in the air conditioner main unit is changed, and the relationship between the air conditioner main unit and the external vertical surface of the building is also changed; the low-level strip-shaped air outlet and the forward-inclined multi-wing centrifugal fan are combined, so that the sectional area of the air outlet of the outer machine is reduced, the air speed, the air jet range and the diffusion effect of the air outlet of the air conditioner host machine to the environment are improved, and the low-level strip-shaped air outlet is more easily butted and fused with decorative units such as a building facade shutter and the like;

under the technical condition of the invention, the decoration units such as shutters and the like on the outer vertical surface of the building can be even unloaded, so that the air-conditioning main unit is exposed, because the outer surface of the front surface of the air-conditioning main unit of the invention does not have the traditional axial flow fan and a large-diameter opening for installing the axial flow fan, and only a vertical flat plate with a strip-shaped air outlet at the bottom is needed, and the vertical flat plate is simply decorated with color textures fused with the outer vertical surface of the building.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:

FIG. 1 is a diagram illustrating an EER (energy efficiency ratio) of an inverter compressor for cooling and heating under different loads;

FIG. 2 is an energy efficiency curve of an air conditioning system employing an inverter compressor under different loads;

fig. 3 is a schematic structural diagram of an air conditioner main unit using a fixed-frequency and variable-frequency double refrigeration loop and an external heat exchanger arranged oppositely according to a preferred embodiment of the present invention;

fig. 4 is an operation diagram of a fixed-frequency and variable-frequency double refrigeration loop provided by the preferred embodiment of the invention;

fig. 5 is a cross-sectional view of the internal structure of the back of the main air conditioner using the external heat exchanger module with the heat exchangers oppositely arranged according to the preferred embodiment of the present invention;

FIG. 6 is a perspective cross-sectional view of a ventilated operation of an outer heat exchanger module with oppositely disposed heat exchangers according to a preferred embodiment of the present invention;

FIG. 7 is a front three-dimensional view of the ventilation operation of the outer heat exchanger module with the heat exchangers oppositely disposed according to the preferred embodiment of the present invention;

fig. 8 is a longitudinal sectional view of a three-channel plate heat exchanger of a dual refrigeration circuit combined variable load air conditioner main unit driven by a fixed frequency conversion compressor according to a preferred embodiment of the present invention;

FIG. 9 is a partially exploded view of a three pass plate heat exchanger provided by a preferred embodiment of the present invention;

fig. 10 is a longitudinal sectional view of a low-load cooling operation of a three-channel plate heat exchanger provided by the preferred embodiment of the invention;

FIG. 11 is a longitudinal sectional view of a three pass plate heat exchanger for high load refrigeration operation in accordance with a preferred embodiment of the present invention;

fig. 12 is a cooling (heating) efficiency curve of a main unit of a combined variable-load air conditioner driven by a fixed-frequency and variable-frequency compressor and a double-cooling loop according to a preferred embodiment of the present invention;

fig. 13 is a cooling (heating) power output curve of a main unit of the air conditioner with a variable load combined by a double cooling circuits driven by a fixed frequency conversion compressor according to the preferred embodiment of the invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Referring to fig. 3 to 11, an air conditioner host adopting a fixed-frequency and variable-frequency double refrigeration loop and an external heat exchanger oppositely arranged includes a housing 5, and a variable-frequency compressor 1, a fixed-frequency compressor 2, an internal heat exchanger 4 and an external heat exchanger module which are arranged in the housing 5, wherein the internal heat exchanger 4 is a three-channel plate heat exchanger, three channels of the three-channel plate heat exchanger are a water channel 43, a first refrigerant channel 41 and a second refrigerant channel 42, respectively, and when the air conditioner host operates, refrigerants in the first refrigerant channel 41 or/and the second refrigerant channel 42 exchange heat with water or solution in the water channel 43;

the outer heat exchanger module comprises at least two outer heat exchangers 3 which are oppositely arranged and are respectively arranged at the left side and the right side in the shell 5, and each outer heat exchanger 3 comprises a first refrigerant pipeline and a second refrigerant pipeline;

the variable frequency compressor 1, the first refrigerant pipeline, the first throttling device and the first refrigerant channel 41 are connected in a circulating mode to form a variable frequency compressor refrigerating circuit, and the fixed frequency compressor 2, the second refrigerant pipeline, the second throttling device and the second refrigerant channel 42 are connected in a circulating mode to form a fixed frequency compressor refrigerating circuit.

The present embodiment does not limit the number of the outer heat exchangers 3 arranged oppositely, and if one or more outer heat exchangers 3 are arranged on the left side in the casing 5, the same number of outer heat exchangers 3 are required to be arranged on the right side in the casing 5. If there are multiple outer heat exchangers 3 on the same side in the housing 5, the outer heat exchangers 3 on the same side are located on the same plane, and may be arranged up and down, or left and right, or up and down and left and right, as long as the outer heat exchangers 3 on the left and right sides in the housing 5 are arranged oppositely.

The outer heat exchanger module further comprises at least one fan 6, the fan 6 is arranged between the outer heat exchangers 3 which are oppositely arranged, air suction ports are formed in two sides of the fan 6, and the two air suction ports face the outer heat exchangers 3 on the two sides respectively;

the left side and the right side of the shell 5 are respectively provided with an air inlet 51 corresponding to the outer heat exchanger 3; the front surface of the shell 5 is provided with an air outlet 52;

when the heat exchanger is in operation, the fan 6 is started, the suction openings on the two sides of the fan generate a negative pressure area, a pressure difference is generated between the inside and the outside of the outer heat exchanger 3 on the two sides of the fan, ambient air is pulled to respectively penetrate through the fin gaps of the outer heat exchanger 3 from the air inlets 51 on the left side and the right side of the shell 5, the ambient air is sucked by the fan 6 after heat exchange is completed, and the ambient air is injected into the shell 5 from the air outlet 52 at a high speed after the pressure is increased.

The fan 6 of this embodiment adopts the multi-wing centrifugal fan that leans forward to replace traditional axial fan, improves air conditioner host computer wind pressure amount of wind. The fan 6 adopts a double-air-suction-port structure, and air suction ports on two sides of the fan 6 respectively face the outer heat exchangers 3 on two sides.

The air outlet 52 of the housing 5 can be arranged at the top or the bottom of the front surface of the housing 5, and if the air outlet 52 of the housing 5 is arranged at the top of the front surface of the housing 5, the air outlet of the fan 6 faces upwards; if the air outlet 52 of the housing 5 is arranged at the bottom of the front surface of the housing 5, the air outlet of the fan 6 faces downwards, and the latter arrangement is preferred in this embodiment. In this embodiment, the air outlet 52 of the housing 5 is in a bar shape, so as to reduce the sectional area of the air outlet 52, and improve the speed, range and diffusion effect of the air outlet of the air conditioner external heat exchanger module to be injected into the ambient atmosphere.

In this embodiment, the number of the fans 6 is not limited, and may be one, and the one fan 6 is located in the middle of the outer heat exchangers 3 on both sides. The number of the fans 6 can be two or more, the fans 6 can be arranged up and down and/or front and back, but cannot be arranged left and right, and the two air suction ports of the fans 6 can only point to the outer heat exchanger 3 and cannot point to other components.

The outer heat exchanger module that this embodiment adopted the heat exchanger to set up relatively has following advantage:

1. radically improves the path, power and efficiency of the air path of the air conditioner external heat exchanger module

The embodiment fundamentally changes the space structure relationship of the external fan of the traditional household air conditioner between the front and the back of the external heat exchanger, and the external heat exchanger module of the air conditioner is disassembled into two heat exchangers which are oppositely arranged left and right, and the external fan is arranged between the left and right heat exchangers; the forward-inclined multi-wing centrifugal fan adopted by the embodiment adopts a double-suction-port structure, and the double suction ports of the fan point to the outer heat exchangers on two sides;

in this embodiment, for a high-power or large-power air conditioner host, a parallel connection manner of a plurality of double-suction-port fan air paths is adopted, the air conditioner external heat exchanger module has suction ports 2 times the number of fans, and when the negative pressure dot matrix generated by the suction ports 2 times the number of fans drives the ambient air flow to pass through the external heat exchangers on both sides, the air flow is more uniform;

the fan of the embodiment is properly selected, so that the air pressure and the air volume of the air-conditioning host are properly improved, and the running economy of the fan is also considered;

the embodiment also adopts the low-level strip-shaped air outlet, reduces the sectional area of the air outlet, and improves the speed, the range and the diffusion effect of the air outlet of the air conditioner host machine which is emitted into the ambient atmosphere;

in sum, the present embodiment fundamentally improves the path, power and efficiency of the air path of the air conditioner external heat exchanger module.

2. The relation between the air conditioner main unit and the outer vertical surface of the building is optimized

The space relationship between the traditional air conditioner and a building is difficult to coordinate: a clear-color large cake face air conditioner host is erected on an upper line equipment platform and a lower line equipment platform of a high-rise building, and the right half part (or the left half part) of a white large cake face is an axial flow fan with an upper row of black holes and a lower row of black holes, so that the visual effect is poor; if the air conditioner is shielded by adopting decoration means such as a shutter and the like, the air outlet resistance of the air conditioner host is increased, the air volume is reduced, and the airflow is short-circuited.

In the embodiment, the outer heat exchanger modules which are arranged opposite to the heat exchanger are adopted, so that the structural relationship between the heat exchanger and the fan in the air conditioner main unit is changed, and the relationship between the air conditioner main unit and the outer vertical surface of the building is also changed; the low-position strip-shaped air outlet and the forward-inclined multi-wing centrifugal fan are combined, so that the sectional area of the air outlet of the outer machine is reduced, the speed of the air outlet of the air conditioner host machine to be injected into the ambient atmosphere, the range and the diffusion effect are improved, and the low-position strip-shaped air outlet is more easily butted and fused with decorative units such as building facade shutters and the like;

under the technical conditions of the embodiment, even the decoration units such as the louver window and the like on the outer facade of the building can be unloaded, so that the air-conditioning main unit is exposed, because the outer surface of the front surface of the air-conditioning main unit of the embodiment does not have the traditional axial flow fan and a large-diameter opening for installing the axial flow fan, only one vertical flat plate with the strip-shaped air outlet at the bottom is needed, and only the vertical flat plate is decorated with simple color textures fused with the outer facade of the building.

In the embodiment, refrigerant channels (fluorine channels) of the inner heat exchangers 4 of two independent refrigeration loops driven by the variable frequency compressor 1 and the fixed frequency compressor 2 are arranged in parallel in the three-channel plate heat exchanger and then arranged in parallel with the water channel 43 in the three-channel plate heat exchanger, and heat exchange between the fluorine channels and the water channel is implemented through channel metal wall plates (heat exchange plates 44) so as to produce cold water and hot water (or cold solution and hot solution) required by cooling, dehumidifying and heating of a fan coil at the tail end of an air conditioner in a building, thereby realizing cooling in summer and heating in winter of the building.

Referring to fig. 8 to 11, in the present embodiment, the water path passage 43, the first refrigerant passage 41 and the second refrigerant passage 42 of the inner heat exchanger 4 are hermetically disposed therebetween.

In operation, the flow direction of water or solution in the water path channel 43 may be the same as or different from the flow direction of refrigerant in the first refrigerant channel 41 or/and the second refrigerant channel 42. In order to facilitate sufficient heat exchange between the refrigerant in the refrigerant channel and the water or the solution in the water channel 43, for example, when the air conditioner is in a cooling operation, the flow direction of the water or the solution in the water channel 43 is opposite to the flow direction of the refrigerant in the first refrigerant channel 41 or/and the second refrigerant channel 42.

In this embodiment, the three-channel plate heat exchanger includes a plurality of heat exchange plates 44 stacked in sequence, a plurality of water channel subchannels 4302, a plurality of first refrigerant subchannels 4102, and a plurality of second refrigerant subchannels 4202 are formed between the plurality of heat exchange plates 44, the first refrigerant subchannels 4102 and the second refrigerant subchannels 4202 are located on two adjacent sides of the water channel subchannels 4302, and the plurality of first refrigerant subchannels 4102 and the plurality of second refrigerant subchannels 4202 are arranged alternately through the plurality of water channel subchannels 4302; a waterway inlet 4406, a waterway outlet 4405, a first refrigerant inlet 4401, a first refrigerant outlet 4402, a second refrigerant inlet 4403 and a second refrigerant outlet 4404 are respectively arranged on the plurality of heat exchange plates 44;

the plurality of water path inlets 4406 are sequentially communicated to form a water inlet main channel 4301, the plurality of water path outlets 4405 are sequentially communicated to form a water outlet main channel 4303, and the plurality of water path sub channels 4302 are respectively communicated with the water inlet main channel 4301 and the water outlet main channel 4303 to form the water path channel 43;

a plurality of the first refrigerant inlets 4401 are communicated in sequence to form a first system refrigerant main channel 4101, a plurality of the first refrigerant outlets 4402 are communicated in sequence to form a first refrigerant outlet main channel 4103, and a plurality of the first refrigerant sub-channels 4102 are respectively communicated with the first system refrigerant main channel 4101 and the first refrigerant outlet main channel 4103 to form the first refrigerant channel 41;

a plurality of said second refrigerant inlets 4403 are sequentially communicated to form a second refrigerant overall channel 4201, a plurality of said second refrigerant outlets 4404 are sequentially communicated to form a second refrigerant overall channel 4203, and a plurality of said second refrigerant sub-channels 4202 are respectively communicated with said second refrigerant overall channel 4201 and said second refrigerant overall channel 4203 to form said second refrigerant channel 42.

The inlet main channel 4301 and the outlet main channel 4303 are located at two ends of the plurality of water sub-channels 4302, the first system refrigerant main channel 4101 and the first outlet refrigerant main channel 4103 are located at two ends of the plurality of first refrigerant sub-channels 4102, and the second system refrigerant main channel 4201 and the second outlet refrigerant main channel 4203 are located at two ends of the second refrigerant sub-channel 4202.

The heat exchanger plate 44 comprises a first brazing zone, a second brazing zone and a corrugated zone, the two ends of the corrugated zone are the first brazing zone and the second brazing zone, the corrugated zone has ridges and valleys, the water path inlet 4406, the first refrigerant outlet 4402 and the second refrigerant outlet 4404 are located in the first brazing zone, and the water path outlet 4405, the first refrigerant inlet 4401 and the second refrigerant inlet 4403 are located in the second brazing zone.

In this embodiment, the rated motor power of the air conditioner main unit is set to be P, and the rated refrigerating capacity (heating capacity) is set to be Q, the rated motor power and the rated refrigerating capacity (heating capacity) of the fixed-frequency compressor 2 and the variable-frequency compressor 1 are set to be close to 0.5 times of the rated motor power P and the rated refrigerating capacity (heating capacity) Q of the main unit, that is, the rated motor power and the rated refrigerating capacity (heating capacity) of the variable-frequency compressor 1 and the fixed-frequency compressor 2 are set to be close to 0.5P, and the rated refrigerating capacity (heating capacity) is set to be close to 0.5Q.

In the embodiment, when the double-refrigeration-loop combined variable-load air conditioner host driven by the fixed frequency conversion compressor operates, refrigerant flow and water flow or solution flow are subjected to high-efficiency heat exchange in channels arranged at intervals of the plate heat exchanger through metal wall plates (heat exchange plates 44) enclosed into the channels.

The main unit of the air conditioner with the variable load and the double refrigeration loops driven by the fixed frequency conversion compressor mainly has two running states:

when the load rate of the whole machine is in a lower state, a single refrigerating system operates

For example, when the overall load factor of the air conditioner main unit is 0.2, it is equivalent to that only 1 terminal (fan coil) of the "one-drive-five" household central air conditioning system operates, please refer to fig. 10, at this time, the air conditioner main unit stops operating the constant-frequency compressor refrigeration circuit, there is no heat exchange in fluid channels of about 1/4 and heat exchange areas of about 1/2 which are connected in series with the constant-frequency compressor refrigeration circuit in the three-channel plate heat exchanger; the air conditioner main machine only operates a refrigeration loop of the variable frequency compressor, channels with the number of about 1/4 and heat exchange areas with the number of about 1/2 which are connected in series in the refrigeration loop of the variable frequency compressor play a role in heat exchange, refrigerant flow in each channel of the refrigeration loop of the variable frequency compressor is double-sided heat exchange, water flow in all water channel sub-channels 4302 is single-sided heat exchange, the output of 0.2Q of the whole machine is 40% of the rated refrigerating capacity (heating capacity) of the variable frequency compressor, and the whole machine is positioned in a high energy efficiency period of 30% -80% of the variable frequency compressor.

Secondly, when the load factor of the whole machine is in a higher state, the double refrigeration systems operate

For example, when the overall load factor of the air conditioner main unit reaches 0.8, two refrigeration loops driven by the fixed-frequency variable-frequency compressor are operated simultaneously, please refer to fig. 11, all heat exchange areas of the refrigerant channels and the refrigerant channels of the left and right number of three-channel plate heat exchangers 1/2 connected in series in the two refrigeration loops perform heat exchange, the refrigerant flow and the water flow in all the channels perform double-sided heat exchange, the full load 0.5Q output of the fixed-frequency compressor and the output of the variable-frequency compressor 0.5Q × 60% are combined to meet the output requirement of the overall unit 0.8Q, wherein the load factor of the variable-frequency compressor is 60%, and is located in the high energy efficiency period from 30% to 80%.

The technical characteristics of the double-refrigeration loop combined variable-load air conditioner host driven by the fixed frequency conversion compressor in the embodiment are as follows:

the high energy efficiency operation range of the air conditioning system is greatly expanded

In the embodiment, the rated electric power and the rated refrigerating capacity (heating capacity) of the variable frequency compressor are reduced by fixing the output combination of the two refrigerating loops driven by the variable frequency compressor, so that the high-energy-efficiency operation range of the variable frequency compressor covers the complete machine 'minimum load' of only 1 fan coil operating indoors, and the high-energy-efficiency operation range of the air-conditioning system is greatly expanded.

Setting the refrigerating capacity (heating capacity) of the whole air conditioner host machine to be Q, setting the rated refrigerating capacity (heating capacity) of the fixed-frequency compressor and the rated refrigerating capacity (heating capacity) of the inverter compressor to be about 0.5 times of the rated refrigerating capacity (heating capacity) Q of the whole air conditioner host machine, referring to fig. 12, when the load factor of the whole machine is in a lower state, for example, the load factor of the whole machine is 0.2, the refrigerating circuit of the fixed-frequency compressor is stopped, only the refrigerating circuit of the inverter compressor is operated, the output of the 0.2Q of the whole machine is equivalent to 40% of the rated refrigerating capacity (heating capacity) of the inverter compressor, and the whole machine is positioned in a high energy efficiency period of 30% -80% of the inverter compressor.

The end of an actual household central air-conditioning system comprises a plurality of room fan coils, the lowest load of the whole machine is the refrigerating capacity (heating capacity) of 1 fan coil, the lowest load is equivalent to the quantum concept of quantum mechanics, the rated load of the whole machine is about 1/7 (15%) to 1/4 (25%), and the energy requirement below the rated load of the whole machine is generally not present under 1/7; even under the condition that the load factor of the whole machine is 0.15(1/7), the embodiment only operates the refrigerating circuit of the inverter compressor, the output of the whole machine 0.15Q is equivalent to 30% of the rated refrigerating capacity (heating capacity) 0.5Q of the inverter compressor, and the output is still positioned in the high energy efficiency period of 30% -80% of the rated refrigerating capacity (heating capacity) of the inverter compressor.

Compared with a household central air conditioner driven by a single high-power variable-frequency compressor, the embodiment reduces the cylinder capacity and the rated refrigerating capacity of the variable-frequency compressor by combining 2 compressors one by one, realizes the coverage of a high-energy efficiency area of the whole air conditioner to a low-load rate (for example, about 15 percent, only one fan coil is operated) area, and solves the problem of low-energy efficiency operation of a user of the household central air conditioner, wherein the time accounts for more than 50 percent, and the load rate of a main machine is less than 30 percent.

High energy efficiency and high energy efficiency for keeping variable load operation

The embodiment supports the variable-load operation of the air conditioner main unit, and keeps high energy efficiency and high energy efficiency under various loads (part or all of indoor fan coil operation).

When the load factor of the whole machine is in a lower state (less than 0.5), the constant-frequency compressor refrigeration circuit is shut down, and only the variable-frequency compressor refrigeration circuit is operated, wherein the variable-frequency compressor is in a period of 30% -100% high energy efficiency, which is equivalent to 15% -50% of the load factor of the whole machine;

when the load factor of the whole machine is in a higher state (more than 0.5), two refrigeration loops respectively driven by 2 compressors with fixed frequency and variable frequency are operated, the full load 0.5Q output of the fixed frequency compressor and the 0.5Q multiplied by x% output of the variable frequency compressor are combined to meet the requirements of the output and the energy efficiency of the whole machine, and x% is the load factor of the variable frequency compressor.

The present embodiment can satisfy the continuous variation of the load factor of the air conditioner main unit, please refer to fig. 13.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. An air conditioner host machine adopting a fixed-frequency and variable-frequency double refrigeration loop and oppositely provided with an outer heat exchanger is characterized by comprising a shell, and a variable-frequency compressor, a fixed-frequency compressor, an inner heat exchanger and an outer heat exchanger module which are arranged in the shell, wherein the inner heat exchanger is a three-channel plate heat exchanger, three channels of the three-channel plate heat exchanger are respectively a water channel, a first refrigerant channel and a second refrigerant channel, and when the air conditioner host machine operates, refrigerants in the first refrigerant channel or/and the second refrigerant channel exchange heat with water or solution in the water channel;

the outer heat exchanger module comprises at least two outer heat exchangers which are oppositely arranged and are respectively arranged at the left side and the right side in the shell, and each outer heat exchanger comprises a first refrigerant pipeline and a second refrigerant pipeline;

the variable frequency compressor, the first refrigerant pipeline, the first throttling device and the first refrigerant channel are in circulating connection to form a variable frequency compressor refrigerating circuit, and the fixed frequency compressor, the second refrigerant pipeline, the second throttling device and the second refrigerant channel are in circulating connection to form a fixed frequency compressor refrigerating circuit.

2. The air conditioner main unit adopting the fixed frequency conversion double refrigeration loops and the oppositely arranged outer heat exchangers according to claim 1, wherein the outer heat exchanger module further comprises at least one fan, the fan is arranged between the oppositely arranged outer heat exchangers, air suction ports are arranged on two sides of the fan, and the two air suction ports respectively face the outer heat exchangers on two sides;

the left side and the right side of the shell are respectively provided with an air inlet corresponding to the outer heat exchanger; the front surface of the shell is provided with an air outlet;

when the heat exchanger is operated, the fan is started, the air suction ports on the two sides of the fan generate a negative pressure area, pressure difference is generated between the inside and the outside of the outer heat exchanger on the two sides of the fan, ambient air is pulled to respectively penetrate through the gaps of the fins of the outer heat exchanger from the air inlets on the left side and the right side of the shell, the ambient air is sucked by the fan after heat exchange is completed, and the ambient air is injected into the outer heat exchanger from the air outlet of the shell at a high speed after the ambient air is boosted.

3. The air conditioner main unit with the fixed frequency conversion double refrigeration loops and the oppositely arranged external heat exchangers according to claim 2, wherein the fan is a double-suction-port forward-inclined multi-wing centrifugal fan.

4. The air conditioner main unit with the fixed-frequency and variable-frequency double refrigeration loops and the oppositely arranged outer heat exchangers as claimed in claim 2, wherein a plurality of the fans are arranged between the oppositely arranged outer heat exchangers and are arranged up and down.

5. The air conditioner main unit adopting the fixed-variable-frequency double refrigeration loops and the external heat exchanger arranged oppositely according to claim 1, wherein the waterway channel, the first refrigerant channel and the second refrigerant channel of the three-channel plate heat exchanger are arranged in a mutually sealed mode.

6. The air conditioner main unit adopting the fixed-frequency and variable-frequency double refrigeration circuits and the external heat exchanger arranged oppositely according to claim 5, wherein in operation, the flow direction of water or solution in the water path channel is opposite to or the same as the flow direction of refrigerant in the first refrigerant channel or/and the second refrigerant channel.

7. The air conditioner main unit adopting the fixed-frequency and variable-frequency double refrigeration loops and the external heat exchanger arranged oppositely according to claim 5, wherein the three-channel plate heat exchanger comprises a plurality of heat exchange plates which are sequentially stacked, a plurality of water channel sub-channels, a plurality of first refrigerant sub-channels and a plurality of second refrigerant sub-channels are formed among the plurality of heat exchange plates, and the plurality of first refrigerant sub-channels and the plurality of second refrigerant sub-channels are arranged alternately through the plurality of water channel sub-channels; a waterway inlet, a waterway outlet, a first refrigerant inlet, a first refrigerant outlet, a second refrigerant inlet and a second refrigerant outlet are respectively arranged on the heat exchange plates;

the plurality of waterway sub-channels are respectively communicated with the water inlet main channel and the water outlet main channel to form the waterway channels;

the plurality of first refrigerant inlets are sequentially communicated to form a first system refrigerant main channel, the plurality of first refrigerant outlets are sequentially communicated to form a first refrigerant main outlet channel, and the plurality of first refrigerant branch channels are respectively communicated with the first system refrigerant main channel and the first refrigerant main outlet channel to form the first refrigerant channel;

the plurality of second refrigerant inlets are sequentially communicated to form a second system refrigerant main channel, the plurality of second refrigerant outlets are sequentially communicated to form a second refrigerant main channel, and the plurality of second refrigerant branch channels are respectively communicated with the second system refrigerant main channel and the second refrigerant main channel to form the second refrigerant channel.

8. The air conditioner main unit with the fixed-frequency and variable-frequency double refrigeration loops and the oppositely arranged external heat exchangers as claimed in claim 7, wherein the water inlet main channel and the water outlet main channel are located at two ends of the plurality of water path sub-channels, the first refrigerant main channel and the first refrigerant outlet main channel are located at two ends of the plurality of first refrigerant sub-channels, and the second refrigerant main channel and the second refrigerant outlet main channel are located at two ends of the second refrigerant sub-channel.

9. The main air conditioner unit with the fixed-frequency and variable-frequency double refrigeration circuits and the oppositely arranged external heat exchangers according to claim 8, wherein the heat exchange plates comprise a brazing area and a corrugated area, the two ends of the corrugated area are the brazing area, the corrugated area is provided with ridges and valleys, and the water path inlet, the water path outlet, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet and the second refrigerant outlet are located in the brazing area.

10. The air conditioner main unit with the fixed-frequency and variable-frequency double refrigeration loops and the external heat exchanger oppositely arranged as claimed in claim 1, wherein the rated motor power and the rated refrigerating capacity of the whole air conditioner main unit are set to be P and Q, and the rated motor power and the rated refrigerating capacity of the fixed-frequency compressor and the variable-frequency compressor are respectively set to be 0.5 times of the rated motor power and the rated refrigerating capacity of the whole air conditioner main unit P and Q:

when the load factor of the air conditioner main machine is less than 0.5, the variable frequency compressor refrigeration loop is operated, and the fixed frequency compressor refrigeration loop is not operated;

and when the load factor of the air conditioner main machine is greater than 0.5, the variable-frequency compressor refrigeration loop and the fixed-frequency compressor refrigeration loop operate simultaneously.

Images