CN112728800A

CN112728800A - Air conditioner

Info

Publication number: CN112728800A
Application number: CN201911034035.6A
Authority: CN
Inventors: 朱合华; 黎顺全; 雷俊杰; 李鸿耀; 陶骙
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2021-04-30

Abstract

The invention discloses an air conditioner, wherein the air conditioner comprises an outdoor unit and an indoor unit, the outdoor unit comprises a compressor and an outdoor heat exchanger, and the indoor unit comprises a dehumidification heat exchanger and a dehumidification throttling regulation device; the air conditioner further includes: the dehumidification system comprises a discharge pipe, a low-pressure suction pipe, a first pipe and a second pipe, wherein the first pipe is sequentially connected with the discharge pipe, an outdoor heat exchanger, a dehumidification throttling adjusting device and a dehumidification heat exchanger, and the second pipe is connected with the dehumidification heat exchanger and the low-pressure suction pipe, so that a dehumidification loop is formed; the air conditioner also comprises a heat storage module; the heat storage module is connected with the outdoor heat exchanger in parallel and can be connected to the dehumidification loop in an on-off mode. The technical scheme of the invention is beneficial to improving the heating performance and simultaneously is beneficial to ensuring the air conditioner to defrost cleanly.

Description

Air conditioner

Technical Field

The invention relates to the technical field of air conditioning equipment, in particular to an air conditioner.

Background

Due to the complexity of weather, the air conditioner needs to have multiple functions at the same time to meet the requirements of people. For example, in order to overcome the weather with very high humidity, it is necessary for an air conditioner to have a dehumidifying function. However, the temperature of the air is reduced after dehumidification in the existing air conditioner with the dehumidification function, so that the comfort of human body feeling is reduced. Meanwhile, after the fins of the outdoor heat exchanger are frosted, once the defrosting energy of the air conditioner system is insufficient and the defrosting is not clean, the running condition of the air conditioner system can be worsened, the outdoor heat exchanger used as an evaporator in the heating process is easily frozen and cracked, the air conditioner system is easily operated with liquid, the defrosting process is actually a refrigerating process, and the comfort of customers is further reduced.

Disclosure of Invention

The invention mainly aims to provide an air conditioner, aiming at improving the defrosting efficiency of the air conditioner on the premise that the air conditioner has a constant-temperature dehumidification function.

In order to achieve the purpose, the air conditioner provided by the invention comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor and an outdoor heat exchanger, and the indoor unit comprises a dehumidification heat exchanger and a dehumidification throttling regulation device;

the air conditioner further includes: a discharge pipe connected to a discharge side of the compressor, a low pressure suction pipe connected to a low pressure suction side of the compressor, a first pipe connecting the discharge pipe, the outdoor heat exchanger, the dehumidification throttle control device, the dehumidification heat exchanger in this order, and a second pipe connecting the dehumidification heat exchanger and the low pressure suction pipe, thereby constituting a dehumidification circuit;

the indoor unit also comprises a reheating heat exchanger, a reheating throttling regulation device and a heat circulation device for sending the heat or cold of the indoor unit into the room;

the air conditioner further includes a constant high pressure pipe and a branch pipe branched from the discharge pipe, the constant high pressure pipe sequentially connecting a first intersection of the first pipe, the reheat throttle control device, the reheat heat exchanger, and the branch pipe to constitute a reheat circuit, wherein the first intersection is located between the dehumidification throttle control device and the outdoor heat exchanger;

the air conditioner also comprises a heat storage module; the heat storage module is connected with the outdoor heat exchanger in parallel and can be connected to the dehumidification loop in an on-off mode.

Optionally, the heat storage module further comprises a heat accumulator and a first control valve connected in series with the heat accumulator, the first control valve being used for controlling the heat accumulator to be connected with and disconnected from the dehumidification loop.

Optionally, the air conditioner further comprises: a first connection pipe branched from a second intersection of the first pipe, and a second connection pipe branched from the second pipe, the second intersection being located between the first intersection and the outdoor heat exchanger, the heat accumulator being connected to the first connection pipe and the second connection pipe, the first connection pipe being provided with the first control valve.

Optionally, the outdoor unit further comprises a first switch switchable between a first switching state and a second switching state;

in the first switching state, the first switch communicates the discharge pipe with the first pipe;

in the second switching state, the first switch communicates the first pipe with the low-pressure suction pipe.

Optionally, the outdoor unit further comprises a second switch switchable between a third switching state and a fourth switching state;

in the third switching state, the second switching device connects the second pipe to the low-pressure suction pipe;

in the fourth switching state, the second switch communicates the discharge pipe with the second pipe.

Optionally, the air conditioner further comprises a subcooler; the subcooler is arranged on a first pipe between the outdoor heat exchanger and the first intersection, and a return pipe of the subcooler is communicated with the low-pressure suction pipe.

Optionally, a first refrigerant flow path and a second refrigerant flow path are arranged in the subcooler, and two ends of the first refrigerant flow path are respectively communicated with first pipes at two ends of the subcooler; one end of the second refrigerant flow path is communicated with the first pipe through a liquid taking pipe, and the other end of the second refrigerant flow path is communicated with the low-pressure suction pipe through a return pipe; and a liquid taking throttle valve is arranged on the liquid taking pipe.

Optionally, the inflow end of the liquid taking pipe is communicated with a first pipe between the subcooler and the outdoor heat exchanger;

alternatively, the inflow end of the liquid take-off pipe communicates with a first pipe between the subcooler and the first intersection.

Optionally, the air conditioner further comprises a gas-liquid separator disposed on the low pressure suction pipe; and a return pipe of the subcooler is communicated with the gas-liquid separator.

Optionally, the air conditioner further comprises an outdoor side throttling regulation device, and the outdoor side throttling regulation device is located on a first pipe between the subcooler and the outdoor heat exchanger.

Optionally, the air conditioner further comprises an unloading valve, and the unloading valve is connected in parallel with the outdoor side throttling regulation device.

Optionally, the air conditioner further includes a second control valve provided on a constant high pressure pipe between the reheat heat exchanger and the branch pipe.

Optionally, the air conditioner further comprises: and a third connection pipe that branches off from the second pipe, the reheat heat exchanger being connected to the third connection pipe, the third connection pipe being provided with the third control valve.

Optionally, the dehumidification throttle adjustment device comprises a dehumidification throttle valve, and the reheat throttle adjustment device comprises a reheat throttle valve.

Optionally, the air conditioner further comprises an oil component and an oil return electromagnetic valve, the oil component is arranged on the discharge pipe, an oil return pipe of the oil component is communicated with the low-pressure suction pipe, an oil return capillary pipe is arranged on the oil return pipe of the oil component, and the oil return electromagnetic valve is connected with the oil return capillary pipe in parallel.

Optionally, the air conditioner further comprises: the air conditioner further includes a plurality of indoor units, each of the indoor units being disposed in parallel and connected to the fourth connecting pipe and the fifth connecting pipe.

In the technical scheme of the invention, the air conditioner can utilize the reheating heat exchanger of the indoor unit to reheat the indoor air while utilizing the dehumidifying heat exchanger of the indoor unit to dehumidify the indoor air, so that the temperature of the air after dehumidification of the air conditioner is kept constant, and the comfort of indoor personnel is improved. Meanwhile, in the heating mode, the refrigerant enters the reheating heat exchanger and the dehumidifying heat exchanger respectively to heat, and simultaneously enters the heat storage module to store heat, and the heat storage module releases heat outwards simultaneously so as to defrost the outdoor heat exchanger, thereby improving the defrosting capability of the air conditioner.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an air conditioner according to a next embodiment of the present invention in a cooling mode;

FIG. 2 is a schematic structural diagram of a next heating mode of the air conditioner of the present invention;

FIG. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention in a constant temperature dehumidification mode;

fig. 4 is a schematic structural diagram of an embodiment of an air conditioner in a forced cooling mode according to the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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. 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.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Also, the meaning of "and/or" and/or "appearing throughout is meant to encompass three scenarios, exemplified by" A and/or B "including scenario A, or scenario B, or scenarios where both A and B are satisfied.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

An embodiment of the present invention provides an air conditioner, and the following description mainly describes a specific structure of the air conditioner.

Referring to fig. 1, 2, 3 and 4, the overall piping structure and component arrangement of the air conditioner will be described first. In the embodiment of the present invention, the air conditioner includes an outdoor unit 100 and an indoor unit 200, the outdoor unit 100 includes a compressor 110 and an outdoor heat exchanger 141, the indoor unit 200 includes a dehumidifying heat exchanger 210 and a dehumidifying throttle adjusting device 230;

the air conditioner further includes: a discharge pipe 111 connected to a discharge side of the compressor 110, a low pressure suction pipe 113 connected to a low pressure suction side of the compressor 110, a first pipe 160 connecting the discharge pipe 111, the outdoor heat exchanger 141, the dehumidification throttle control device 230, the dehumidification heat exchanger 210 in this order, and a second pipe 170 connecting the dehumidification heat exchanger 210 and the low pressure suction pipe 113, thereby constituting a dehumidification circuit;

the indoor unit 200 further includes a reheat heat exchanger 220, a reheat throttle adjusting device 240, and a heat cycle device for sending heat or cold of the indoor unit 200 into the room; wherein, the heat cycle device may be a wind wheel in some embodiments, and the wind wheel rotates to deliver the air after heat exchange with the dehumidification heat exchanger 210 and the reheat heat exchanger 220 to the indoor. Of course, in other embodiments, the heat cycle device may also be a water cycle device, and the dehumidification heat exchanger 210 and the reheat heat exchanger 220 send heat or cold to the indoor through the circulating water flowing in the water cycle device.

The air conditioner further includes a constant high pressure pipe 180 and a branch pipe 112 branched from the discharge pipe 111, the constant high pressure pipe 180 connects a first intersection 161 of the first pipe 160, the throttle reheating adjuster 240, the reheat heat exchanger 220, and the branch pipe 112 in this order to constitute a reheat circuit, wherein the first intersection 161 is located between the throttle dehumidifying adjuster 230 and the outdoor heat exchanger 141; the air conditioner further includes a heat storage module 300; the heat storage module 300 is connected in parallel with the outdoor heat exchanger 141 and is connected to the dehumidification circuit in an on-off manner.

In the technical scheme of the invention, the air conditioner can utilize the reheating heat exchanger 220 of the indoor unit 200 to reheat the indoor air while utilizing the dehumidifying heat exchanger 210 of the indoor unit 200 to dehumidify the indoor air, so that the temperature of the dehumidified air of the air conditioner is kept constant, and the comfort of indoor personnel is improved. Meanwhile, in the heating mode, while the refrigerant respectively enters the reheat heat exchanger 220 and the dehumidification heat exchanger 210 to heat, the refrigerant enters the heat storage module 300 to store heat, and the heat storage module 300 releases heat to the outside at the same time, so that the outdoor heat exchanger 141 is defrosted, and the defrosting capability of the air conditioner is improved.

In order to automatically control defrosting according to the frost formation of the outdoor heat exchanger 141, the heat storage module 300 is disposed near or adjacent to the outdoor heat exchanger 141. In some embodiments, the thermal storage module 300 further comprises a thermal accumulator 310 and a first control valve 320 in series with the thermal accumulator 310, the first control valve 320 for controlling the thermal accumulator 310 to communicate with and disconnect from the dehumidification loop. Specifically, the air conditioner further includes: a first connection pipe 164 branched from a second intersection 162 of the first pipe 160, and a second connection pipe 165 branched from the second pipe 170, the second intersection 162 being located between the first intersection 161 and the outdoor heat exchanger 141, the heat accumulator 310 being connected to the first connection pipe 164 and the second connection pipe 165, the first connection pipe 164 being provided with a first control valve 320.

It will be appreciated that the first control valve 320 comprises a solenoid valve. Of course, the first control valve 320 is not limited to a solenoid valve. The heat accumulator 310 may be selected as a phase change heat accumulator using a heat accumulating material capable of phase change, which has a strong heat accumulating capacity and is less likely to leak and volatilize than a liquid heat accumulating material, or a liquid heat accumulating material. In one embodiment, the thermal accumulator 310 may be selected as a phase change thermal accumulator wrapped around the outdoor heat exchanger 141.

Through the arrangement of the heat storage module 300, the heat accumulator 310 of the heat storage module 300 stores heat when the air conditioner is in the heating mode, so that when frost is condensed on the outdoor heat exchanger 141 in the heating mode, the heat accumulator 310 releases heat to defrost the outdoor heat exchanger 141 without stopping, defrosting time is effectively shortened, and energy saving degree is improved. It is understood that the heat storage module 300 may also use the system waste heat to perform heat storage and defrosting.

In this embodiment, in the heating mode, the refrigerant absorbs and stores heat through the heat accumulator 310 and releases heat simultaneously to defrost the outdoor heat exchanger 141, and at this time, the dehumidification heat exchanger 210 and the reheat heat exchanger 220 of the indoor unit 200 continuously supply heat to the room during defrosting, thereby improving comfort.

On the basis of the above-mentioned pipeline, as shown in fig. 3, the dehumidification heat exchanger 210 of the air conditioner performs cooling, and the reheat heat exchanger 220 performs heating, so that constant temperature dehumidification can be realized. Wherein, the dehumidification throttle adjusting device 240 comprises a dehumidification throttle valve, and the reheat throttle adjusting device 240 comprises a reheat throttle valve.

In some embodiments, as shown in fig. 1, 2, 3 and 4, the outdoor unit 100 further comprises a first switch 131, the first switch 131 being switchable between a first switching state and a second switching state;

in the first switching state, the first switch 131 communicates the discharge pipe 111 with the first pipe 160;

in the second switching state, the first switch 131 communicates the first pipe 160 with the low-pressure suction pipe 113.

Through the arrangement of the first switch 131, in the first switching state, the air conditioner is in a refrigeration, forced cooling or constant temperature dehumidification state, that is, the dehumidification heat exchanger 210 refrigerates, or the dehumidification heat exchanger 210 and the reheat heat exchanger 220 refrigerate simultaneously, or the dehumidification heat exchanger 210 refrigerates and the reheat heat exchanger 220 heats; in the second switching state, the air conditioner is in a heating state, that is, the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 simultaneously heat. Optionally, the first switch 131 is a three-way valve. Of course, the first switch 131 may also be a four-way valve, and in the first switching state or the second switching state, one port of the four-way valve is in a normally closed state.

As shown in fig. 1, 2, 3 and 4, the first switch 131 has four ports, i.e., a D port, a C port, an E port and an S port, wherein the E port of the first switch 131 is a normally closed port, one ends of the discharge pipe 111 and the branch pipe 112 are connected to the D port of the first switch 131, one end of the first pipe 160 is connected to the C port of the first switch 131, and one end of the low pressure suction pipe 113 is connected to the S port of the first switch 131.

It can be understood that, in the first switching state, the D end of the first switch 131 is communicated with the C end, and the E end of the first switch 131 is communicated with the S end (that is, the E end of the first switch 131 is not communicated with the S end), so that the discharge pipe 111 is communicated with the first pipe 160, and thus, the refrigerant with high temperature and high pressure is discharged from the discharge pipe 111, passes through the D end and the C end of the first switch 131, the first pipe 160, the outdoor heat exchanger 141 and the subcooler 150, and then enters the dehumidification heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200 to perform cooling, respectively; in the second switching state, the end D of the first switch 131 is communicated with the end E (i.e., the end D of the first switch 131 is not communicated with the end E), and the end C of the first switch 131 is communicated with the end S, so that the first pipe 160 is communicated with the low pressure suction pipe 113, and at this time, the air conditioner is in a heating mode, so that the cooling air heated by the indoor unit 200 enters the first pipe 160, passes through the subcooler 150, the outdoor heat exchanger 141, the end S and the end C of the first switch 131, and then flows into the gas-liquid separator 121 communicated with the low pressure suction pipe 113.

In some other embodiments, the outdoor unit 100 further includes a second switch 132, the second switch 132 being switchable between a third switching state and a fourth switching state;

in the third switching state, the second switching device 132 connects the second pipe 170 to the low-pressure suction pipe 113;

in the fourth switching state, the second switching device 132 connects the discharge pipe 111 to the second pipe 170.

As shown in fig. 1, 2, 3 and 4, the second switch 132 has four ports, i.e., a D port, a C port, an E port and an S port, wherein the C port of the second switch 132 is a normally closed port, one end of the branch pipe 112 and one end of the constant high pressure pipe 180 are connected to the D port of the second switch 132, one end of the second pipe 170 is connected to the E port of the second switch 132, and one end of the low pressure suction pipe 113 is connected to the S port of the second switch 132.

It can be understood that, in the third switching state, the D end of the second switch 132 is communicated with the C end (that is, the D end of the second switch 132 is not communicated with the C end), and the E end of the second switch 132 is communicated with the S end, so that the second piping 170 is communicated with the low-pressure suction pipe 113, and at this time, the air conditioner is in the cooling, forced cooling or constant temperature dehumidification mode, so that the refrigerant flowing out after cooling by the dehumidification heat exchanger 210, the reheat heat exchanger 220 and the indoor heat exchanger 250 flows into the gas-liquid separator 121 communicated with the low-pressure suction pipe 113 through the second piping 170 and the E end and the S end of the second switch 132; in the fourth switching state, the end D of the second switch 132 is communicated with the end E, and the end C of the second switch 132 is communicated with the end S (that is, the end C of the second switch 132 is not communicated with the end S), so that the discharge pipe 111 is communicated with the second pipe 170 via the branch pipe 112, at this time, the air conditioner is in a heating mode, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, and a part of the high-temperature and high-pressure refrigerant passes through the branch pipe 112 and the end D and the end E of the second switch 132 in sequence, and the second pipe 170 and then enters the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200 to be heated.

In the present embodiment, the first and

second switches

131 and 132 may exist at the same time, so that the air conditioner may be switched in four states of constant temperature dehumidification, single heating, cooling of the dehumidification heat exchanger 210, and forced cooling.

When the first switch 131 communicates the discharge pipe 111 with the first pipe 160 in the first switching state and the second switch 132 communicates the second pipe 170 with the low-pressure suction pipe 113 in the third switching state by the arrangement of the second switch 132, as shown in fig. 1, 3 and 4, the air conditioner is in the cooling, constant temperature dehumidification or forced cooling state, that is, the dehumidifying heat exchanger 210 cools, or the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 are at the same time, or the dehumidifying heat exchanger 210 cools and the reheating heat exchanger 220 heats; when the first switch 131 communicates the first pipe 160 with the low-pressure suction pipe 113 in the second switching state and the second switch 132 communicates the discharge pipe 111 with the second pipe 170 in the fourth switching state, the air conditioner is in the heating state, that is, the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 simultaneously perform heating. Alternatively, the first switch 131 is a three-way valve and the second switch 132 is a three-way valve. Of course, the first switch 131 may be a four-way valve, and the second switch 132 may be a four-way valve. In the first switching state/the third switching state or the second switching state/the fourth switching state, one port of the four-way valve is in a normally closed state.

In some embodiments, in order to improve the heating capacity of the air conditioner at low temperature, the supercooling, and the effect of adjusting the degree of superheat of the discharge air, the air conditioner further includes a subcooler 150, the subcooler 150 is disposed on the first pipe 160 between the outdoor heat exchanger 141 and the first cross point 161, and the return pipe 153 of the subcooler 150 communicates with the low pressure suction pipe 113.

The subcooler 150 has a throttling function, a first refrigerant flow path 151 and a second refrigerant flow path 152 are arranged in the subcooler 150, and two ends of the first refrigerant flow path 151 are respectively communicated with first pipes 160 at two ends of the subcooler 150; one end of the second refrigerant passage 152 is connected to the first pipe 160 through the liquid-taking pipe 154, and the other end is connected to the low-pressure suction pipe 113 through the return pipe 153; a liquid extraction throttle 155 is provided in the liquid extraction pipe 154.

It can be understood that one end of the first refrigerant flow path 151 communicates with a refrigerant inlet of the supercooler 150, and the other end communicates with a refrigerant outlet of the supercooler 150. The liquid-taking pipe 154 has one end communicating with the first pipe 160 and the other end communicating with the second refrigerant passage 152, and the return pipe 153 has one end communicating with the second refrigerant passage 152 and the other end communicating with the low-pressure suction pipe 113.

In this way, the discharge air of the compressor 110 is switched by the first switch 131 and the second switch 132, and then enters the reheat heat exchanger 220 and the dehumidification heat exchanger 210 for heating, and the liquid refrigerant coming out of the reheat heat exchanger 220 and the dehumidification heat exchanger 210 enters the subcooler 150 and then is divided into two parts: the first part directly enters the outdoor heat exchanger 141 for evaporation and heat absorption after being throttled and reduced in pressure by the outdoor throttling adjusting device 142 (electronic expansion valve), the second part enters the subcooler 150 for heat absorption and evaporation after being throttled and reduced in pressure by the liquid taking throttle valve 155 (electronic expansion valve), the middle-pressure saturated steam after evaporation enters the low-pressure suction pipe 113 through the return pipe 153 and is mixed with the refrigerant of the low-pressure suction port S of the compressor 110 for compression, the problems of small refrigerant flow, low return pressure, high compression ratio and the like in a low-temperature environment are solved, and the low-temperature heat production quantity and the reliability of the system are improved.

To enhance the liquid extraction effect, the inflow end of the liquid extraction pipe 154 communicates with the first pipe 160 between the subcooler 150 and the outdoor heat exchanger 141. In other embodiments, the inflow end of the liquid take-off pipe 154 may also be in communication with the first piping 160 between the subcooler 150 and the first intersection 161. That is, the refrigerant flows in from the refrigerant outflow end of the subcooler 150, which is advantageous for improving the reliability of liquid extraction.

The embodiment of the invention adopts the system design with the subcooler 150 on the basis of the three-pipe dehumidification and reheating scheme, further reduces the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger 141 by controlling the liquid taking throttle valve 155 (electronic expansion valve) in the system design loop with the subcooler 150, improves the supercooling degree and adjusts the exhaust superheat degree, so that the refrigerant is completely condensed into liquid, the liquid refrigerant enters the indoor heat exchanger for heat absorption and evaporation after being throttled and depressurized by the indoor electronic expansion valve, and the refrigerant generated by the gas-liquid two-phase state can be prevented from being abnormal when the refrigerant passing through the indoor throttling device is in the full liquid state.

After the discharge air of the compressor 110 is switched by the first switch 131, the high-pressure and high-temperature gaseous refrigerant enters the outdoor heat exchanger 141 for condensation and heat exchange, and the gas-liquid two-phase medium-temperature and high-pressure refrigerant coming out of the outdoor heat exchanger 141 enters the subcooler 150 and then is divided into two parts: the first part is throttled and depressurized by a liquid taking throttle valve 155, then enters a subcooler 150 through a liquid taking pipe 154 to absorb heat and evaporate, the evaporated gaseous refrigerant passes through a return pipe 153, enters a gas-liquid separator 121, is mixed with the gaseous refrigerant subjected to heat absorption and evaporation by an indoor heat exchanger, and then enters a low-pressure air suction port S of a compressor 110, the second part is further condensed and heat exchanged from the subcooler 150, the gas-liquid two-phase refrigerant is changed into a pure liquid refrigerant, the pure liquid refrigerant flows indoors, and is throttled and depressurized by a dehumidification throttle valve and a throttle valve and then enters a dehumidification heat exchanger 210 and a reheating heat exchanger 220 to absorb heat and evaporate. The refrigerant entering the dehumidification regulating valve and the reheating regulating valve (electronic expansion valve) is changed into pure liquid from gas-liquid two-phase state, so that the problem of refrigerant abnormal sound generated when the gas-liquid two-phase refrigerant passes through the throttling device is solved.

In this embodiment, by the technical scheme of the present invention, the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger 141 can be further reduced, the supercooling degree is increased, and the exhaust superheat degree is adjusted, so that the refrigerant is completely condensed into a liquid state from a gas-liquid two-phase state, the liquid refrigerant enters the indoor heat exchanger to absorb heat and evaporate after being throttled and depressurized by the indoor electronic expansion valve (the dehumidification throttle valve and the reheating throttle valve), and when the refrigerant passing through the indoor throttling device (the dehumidification throttle valve and the reheating throttle valve) is in a full liquid state, the problem of refrigerant abnormal sound generated by the gas-liquid two-phase refrigerant passing through the throttling device can be solved, and the satisfaction degree.

In order to better adjust the supercooling degree of the outdoor heat exchanger 141, the air conditioner further includes an outdoor side throttling adjustment device 142, and the outdoor side throttling adjustment device 142 is disposed on the first pipe 160 between the subcooler 150 and the outdoor heat exchanger 141. Optionally, the outdoor side throttle adjusting means 142 comprises an outdoor throttle valve.

In some embodiments, in order to reduce the pressure loss of the refrigerant in the first pipe 160, the air conditioner further includes an unloading valve 143, and the unloading valve 143 is disposed in parallel with the outdoor-side throttling adjustment device 142.

It can be understood that the conducting direction of the unloading valve 143 may be set according to different working conditions, and may be set to be in one-way conduction from the outdoor heat exchanger 141 to the first intersection 211, or may be set to be in one-way conduction from the first intersection 211 to the outdoor heat exchanger 141, taking the former as an example. When the throttle is not necessary, the outdoor throttle control device 142 is opened by opening the unload valve 143 as much as possible. The outdoor side throttle adjusting means 142 may be an electromagnetic throttle valve.

In some embodiments, when the outdoor-side throttling adjustment device is a large-caliber throttle valve, the unloading valve 143 may not be provided; when the outdoor side throttling regulation device is a throttling valve with a small diameter, the unloading valve 143 is arranged as much as possible to relieve the pressure in the throttling device, so that the throttling device is protected.

In some embodiments, in order to avoid the unpleasant noise of the refrigerant in the vapor-liquid two-phase state when passing through the indoor throttling device, the air conditioner further includes a gas-liquid separator 121, and the gas-liquid separator 121 is disposed on the low-pressure suction pipe 113; the return pipe 153 of the subcooler 150 communicates with the gas-liquid separator 121.

For convenience of control, in some examples, the return pipe 153 is communicated with the gas-liquid separator 121 through the low pressure suction pipe 113, and the control valve is disposed on the return pipe 153 or a communication pipe between the return pipe 153 and the low pressure suction pipe 113. It will be appreciated that in the cooling mode or the thermostatic dehumidification mode, the control valve on the connection pipe between the return pipe 153 and the low pressure suction pipe 113 may be opened to eliminate the abnormal noise. So set up for the air conditioner can adjust the control valve according to specific circumstances, thereby improves the heating capacity of air conditioner under the heating mode, reduces the noise in refrigeration and constant temperature dehumidification mode.

In some embodiments, the compressor 110 is an enhanced vapor injection compressor 110, and the compressor 110 has a medium pressure suction port (i.e., a vapor injection port) in addition to a conventional high pressure discharge port P, a low pressure suction port S, and a medium pressure refrigerant vapor entering the compressor 110 through the vapor injection port to increase the effective flow rate of the refrigerant.

The port a of the subcooler 150 is connected with one end of the outdoor heat exchanger 141, the port b of the subcooler 150 is connected with the second intersection 212, the port c of the subcooler 150 is connected with the liquid taking pipe 154, the port d of the subcooler 150 is connected with the return pipe 153, and the liquid taking throttle valve 155 is connected in series with the liquid taking pipe 154.

In order to further improve the heating capability of the air conditioner at low temperature, the return pipe 153 of the subcooler 150 may have various forms, and the return pipe 153 may include only a return pipe body, or may include a return pipe body and a communication pipe, one end of the communication pipe is communicated with the return pipe body, and the other end is communicated with the medium-pressure suction port of the compressor 110, and the communication pipe is provided with a control valve.

In order to improve the reliability of the second switch 132, the second switch 132 is controlled by a three-way valve instead of a four-way valve. In some embodiments, the air conditioner further includes a second control valve 190, the second control valve 190 being disposed on the constant high pressure piping 180 between the reheat heat exchanger 220 and the branch pipe 112. Specifically, the constant high-pressure piping 180 is communicated with the branch pipe 112, and the second control valve 190 is provided on the constant high-pressure piping 180, so that the second control valve 190 is engaged with the second switch 132, and thus the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 realize a heating mode for heating simultaneously, the dehumidifying heat exchanger 210 realizes a constant-temperature dehumidifying mode for heating by the refrigerating and reheating heat exchanger 220, and the dehumidifying heat exchanger 210 realizes a refrigerating mode for refrigerating. Because the second control valve 190 is a separate control valve, compared with a four-way valve, the structure is simpler, and the stability and reliability are higher.

In addition, the second control valve 190 may be a solenoid valve. The solenoid valve can still work stably and reliably under the condition that the liquid refrigerant enters, and if the liquid refrigerant enters the four-way valve, the working stability of the solenoid valve is affected, so that the stability and the reliability of the operation and the state switching of the air conditioner can be improved by using the independent second control valve 190.

In some embodiments, in order to implement the forced cooling mode in which the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 of the indoor unit 200 simultaneously implement cooling, as shown in fig. 4, the air conditioner further includes: a third connection pipe 168 branched from the second pipe 170 is connected to the reheat heat exchanger 220, and a third control valve 169 is provided in the third connection pipe 168.

It can be understood that the heating mode of heating by the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 simultaneously, or the constant temperature dehumidifying mode of heating by the dehumidifying heat exchanger 210 and the reheating heat exchanger 220, or the forced heat mode of cooling by the dehumidifying heat exchanger 210 and the reheating heat exchanger 220 simultaneously, or the cooling mode of cooling by the dehumidifying heat exchanger 210 alone is realized by controlling the second switch 132, the second control valve 190 and the third control valve 169. Since the second control valve 190 and the third control valve 169 are separate control valves, the structure is simpler and the stability and reliability are higher compared to a four-way valve.

In one embodiment, in order to achieve the oil return effect, the air conditioner further includes an oil component 122 and an oil return solenoid valve 125, the oil component 122 is disposed on the discharge pipe 111, an oil return pipe 123 of the oil component 122 is communicated with the low pressure suction pipe 113, an oil return capillary tube 124 is disposed on the oil return pipe 123 of the oil component 122, and the oil return solenoid valve 125 is disposed in parallel with the oil return capillary tube 124. It will be appreciated that the oil return effect may be achieved by providing the oil 122 and the oil return solenoid 125.

In some embodiments, the air conditioner further includes a plurality of indoor units 200, and the heat exchanger types included in the respective indoor units 200 may be different, such as an indoor unit with a constant temperature dehumidification function (including both the dehumidification heat exchanger 210 and the reheating heat exchanger 220), an ordinary cooling/heating indoor unit (including only one indoor heat exchanger 250 and a corresponding throttling device), and one or more indoor units with a switching device capable of freely switching cooling or heating states, so that the air conditioner can simultaneously perform a hybrid operation of constant temperature dehumidification, cooling, heating, and the like.

Specifically, as shown in fig. 1, 2, 3 and 4, the air conditioner further includes: the air conditioner further includes a plurality of indoor units 200, wherein the plurality of indoor units 200 are arranged in parallel and are connected to the fourth connection pipe 166 and the fifth connection pipe 167, respectively.

On the basis of the above-mentioned pipeline, the air conditioner has a cooling mode, at this time, the first switch 131 is in the first switching state and the second switch 132 is in the third switching state, that is, the D end and the C end of the first switch 131 are communicated, the E end of the first switch 131 is normally closed, the E end and the S end of the second switch 132 are communicated, and the C end of the second switch 132 is normally closed; the second control valve 190 on the constant high-pressure pipe 180 is closed, and the third control valve 169 on the third connection pipe 168 is closed.

As shown in fig. 1 and 4, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, passes through the D-end and the C-end (which may not be provided in some embodiments) of the first switch 131, the first pipe 160, the outdoor heat exchanger 141, and the subcooler 150 in sequence, and then enters the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200, respectively, to perform cooling. Flows out of the dehumidifying heat exchanger 210 and the indoor heat exchanger 250, passes through the second pipe 170 and the E and S ends (which may not be provided in some embodiments) of the second switch 132, and flows into the gas-liquid separator 121, thereby performing general cooling of the air conditioner.

The air conditioner has a forced cooling mode, in which the first switch 131 is in a first switching state and the second switch 132 is in a third switching state, that is, the end D of the first switch 131 is communicated with the end C, the end E of the first switch 131 is normally closed, the end E of the second switch 132 is communicated with the end S, and the end C of the second switch 132 is normally closed; the second control valve 190 on the constant high-pressure pipe 180 is closed, and the third control valve 169 on the third connection pipe 168 is opened.

As shown in fig. 4, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, sequentially passes through the D and C ends (which may not be present in some embodiments) of the first switch 131, the first pipe 160, the outdoor heat exchanger 141, and the subcooler 150, then respectively enters the dehumidifying heat exchanger 210, the reheating heat exchanger 220, and the indoor heat exchanger 250 of the indoor unit 200 to perform cooling, flows out of the dehumidifying heat exchanger 210, the reheating heat exchanger 220, and the indoor heat exchanger 250, passes through the second pipe 170 and the E and S ends (which may not be present in some embodiments) of the second switch 132, and flows into the gas-liquid separator 121, thereby performing forced cooling of the air conditioner.

The air conditioner has a heating mode, in which the first switch 131 is in the second switching state and the second switch 132 is in the fourth switching state, that is, the end S of the first switch 131 is communicated with the end C, the end E of the first switch 131 is normally closed, the end D of the second switch 132 is communicated with the end E, and the end C of the second switch 132 is normally closed; the second control valve 190 on the constant high-pressure pipe 180 is opened, and the third control valve 169 on the third connection pipe 168 is closed.

As shown in fig. 2, the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, and a portion of the refrigerant passes through the D end and the E end of the second switch 132, the second pipe 170, and then enters the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200 to be heated, and then flows out of the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 and enters the first pipe 160; the other part enters the reheat heat exchanger 220 through the branch pipe 112 and the constant high pressure pipe 180 in this order to be heated, flows out of the reheat heat exchanger 220, enters the first pipe 160, passes through the subcooler 150, the outdoor heat exchanger 141, and the S-and C-ends of the first switch 131, and flows into the gas-liquid separator 121, thereby heating the air conditioner.

The air conditioner has a constant temperature dehumidification mode, in which the first switch 131 is in a first switching state and the second switch 132 is in a third switching state, that is, the D terminal and the C terminal of the first switch 131 are communicated, the E terminal of the first switch 131 is normally closed, the E terminal and the S terminal of the second switch 132 are communicated, and the C terminal of the second switch 132 is normally closed; the second control valve 190 on the constant high-pressure pipe 180 is opened, and the third control valve 169 on the third connection pipe 168 is closed.

As shown in fig. 3, the refrigerant of high temperature and high pressure is discharged from the discharge pipe 111, and a portion of the refrigerant passes through the D end and the C end (which may not be present in some embodiments) of the first switch 131, the first pipe 160, the outdoor heat exchanger 141, and the subcooler 150 in sequence, and then enters the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200 to perform cooling, and then flows into the gas-liquid separator 121 through the second pipe 170, the E end and the S end (which may not be present in some embodiments) of the second switch 132. The other part of the refrigerant passes through the branch pipe 112 and the constant high pressure pipe 180 in sequence, enters the reheat heat exchanger 220 to perform heating, and then flows into the dehumidification heat exchanger 210 to perform cooling.

The air conditioner has a heating and defrosting mode, in which the first switch 131 is in the second switching state and the second switch 132 is in the fourth switching state, that is, the end S of the first switch 131 is communicated with the end C, the end E of the first switch 131 is normally closed, the end D of the second switch 132 is communicated with the end E, the end C of the second switch 132 is normally closed, the second control valve 190 on the constant high pressure pipe 180 is opened, the third control valve 169 on the third connection pipe 168 is closed, and the first control valve 320 on the first connection pipe 164 is opened.

As shown in fig. 3, the high-temperature and high-pressure refrigerant is discharged from the exhaust pipe 111, and a portion of the refrigerant passes through the D end and the E end of the second switch 132, the second pipe 170, and then enters the dehumidifying heat exchanger 210 and the indoor heat exchanger 250 of the indoor unit 200 to perform heating, and enters the heat accumulator 310 through the second connection pipe 165 to store heat, and then exits from the dehumidifying heat exchanger 210, the indoor heat exchanger 250, and the heat accumulator 310 and enters the first pipe 160; the other part enters the reheat heat exchanger 220 through the branch pipe 112 and the constant high pressure pipe 180 in this order to be heated, flows out of the reheat heat exchanger 220, enters the first pipe 160, passes through the subcooler 150, the outdoor heat exchanger 141, and the S-and C-ends of the first switch 131, and flows into the gas-liquid separator 121, thereby heating the air conditioner.

In this process, because the frost condition appears in outdoor heat exchanger 141 refrigeration, the heat accumulator 310 can release heat when storing heat, so that the heat accumulator 310 of heat accumulation module 300 releases heat to defrost outdoor heat exchanger 141, defrosting of the air conditioner is not stopped, defrosting time is reduced, energy saving is improved, and comfort of the air conditioner is improved. It should be noted that, in order to avoid the influence on the operation of the air conditioner when defrosting is performed by using the heat storage module 300, a detection device is arranged on the outdoor heat exchanger 141 or the air conditioner, and the frost condition of the outdoor heat exchanger 141 is detected by using the detection device, so as to determine whether a defrosting condition is reached according to the result of the detection device, and when the defrosting condition is reached, the heat storage 310 of the heat storage module 300 is enabled to defrost the outdoor heat exchanger 141 by controlling the first control valve 320 of the heat storage module 300.

In some embodiments, during defrosting, for example, when the air conditioner is in a heating defrosting mode, the first control valve 320 on the first connection pipe 164 may be always in an open state, that is, during heating of the air conditioner, the heat accumulator 310 of the heat accumulation module 300 may be continuously used to release heat to defrost the outdoor heat exchanger 141. When the frost condensation of the outdoor heat exchanger 141 is detected and the defrosting condition is reached, the first control valve 320 of the heat storage module 300 is controlled, so that the heat accumulator 310 of the heat storage module 300 defrosts the outdoor heat exchanger 141. When no defrosting is required or no defrosting condition is reached, the first control valve 320 may be closed.

Of course, in some embodiments, after defrosting of the outdoor heat exchanger 141 by heat release of the heat accumulator 310 of the heat accumulation module 300 is completed, the air conditioning system may be continuously heated by closing the first control valve 320 on the first connection pipe 164, so that the heating capacity of the air conditioner may be improved. Alternatively, after the heat accumulator 310 of the heat accumulation module 300 completes heat accumulation, continuous heating may be achieved by closing the first control valve 320 on the first connection pipe 164, so that the heating capacity of the air conditioner may be improved.

In some embodiments, when the air conditioner operates in the cooling or constant temperature dehumidification or forced cooling mode, as shown in fig. 1, 3 and 4, if it is detected that the outdoor heat exchanger 141 is frosted and a defrosting condition is reached, the outdoor heat exchanger 141 may be defrosted by using the heat stored in the heat accumulator 310 during the heating mode by opening the first control valve 320 on the first connection pipe 164, and when defrosting is completed, the first control valve 320 on the first connection pipe 164 may be continuously closed.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An air conditioner is characterized by comprising an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor and an outdoor heat exchanger, and the indoor unit comprises a dehumidification heat exchanger and a dehumidification throttling regulation device;

2. The air conditioner according to claim 1, wherein the heat storage module further comprises a heat accumulator and a first control valve connected in series with the heat accumulator for controlling the heat accumulator to be connected to and disconnected from the dehumidification circuit.

3. The air conditioner according to claim 2,

the air conditioner further includes: a first connection pipe branched from a second intersection of the first pipe, and a second connection pipe branched from the second pipe, the second intersection being located between the first intersection and the outdoor heat exchanger, the heat accumulator being connected to the first connection pipe and the second connection pipe, the first connection pipe being provided with the first control valve.

4. The air conditioner according to claim 1,

the outdoor unit further comprises a first switch switchable between a first switching state and a second switching state;

5. The air conditioner according to claim 4,

the outdoor unit further comprises a second switch switchable between a third switching state and a fourth switching state;

6. The air conditioner of claim 1, further comprising a subcooler; the subcooler is arranged on a first pipe between the outdoor heat exchanger and the first intersection, and a return pipe of the subcooler is communicated with the low-pressure suction pipe.

7. The air conditioner according to claim 6, wherein a first refrigerant flow path and a second refrigerant flow path are provided in the subcooler, and both ends of the first refrigerant flow path are respectively communicated with first pipes at both ends of the subcooler; one end of the second refrigerant flow path is communicated with the first pipe through a liquid taking pipe, and the other end of the second refrigerant flow path is communicated with the low-pressure suction pipe through a return pipe; and a liquid taking throttle valve is arranged on the liquid taking pipe.

8. The air conditioner according to claim 7, wherein an inflow end of the liquid take-out pipe communicates with a first pipe between the subcooler and the outdoor heat exchanger;

9. The air conditioner according to claim 6,

the air conditioner also comprises a gas-liquid separator, and the gas-liquid separator is arranged on the low-pressure suction pipe; and a return pipe of the subcooler is communicated with the gas-liquid separator.

10. The air conditioner according to claim 6, further comprising an outdoor side throttling device provided on the first piping between said subcooler and said outdoor heat exchanger.

11. The air conditioner according to claim 10, further comprising an unloading valve provided in parallel with said outdoor side throttle adjusting means.

12. The air conditioner as claimed in claim 1, further comprising a second control valve provided on a constant high pressure pipe between the reheat heat exchanger and the branch pipe.

13. The air conditioner according to claim 1,

the air conditioner further includes: and a third connection pipe that branches off from the second pipe, the reheat heat exchanger being connected to the third connection pipe, the third connection pipe being provided with the third control valve.

14. The air conditioner as claimed in claim 1, wherein said dehumidifying throttle adjusting means comprises a dehumidifying throttle valve, and said reheating throttle adjusting means comprises a reheating throttle valve.

15. The air conditioner according to claim 1, further comprising an oil component provided on the discharge pipe, and an oil return solenoid valve provided on the oil return pipe in communication with the low pressure suction pipe, and provided with an oil return capillary pipe, the oil return solenoid valve being provided in parallel with the oil return capillary pipe.

16. The air conditioner according to any one of claims 1 to 15,

the air conditioner further includes: the air conditioner further includes a plurality of indoor units, each of the indoor units being disposed in parallel and connected to the fourth connecting pipe and the fifth connecting pipe.