WO2021082331A1 - Air conditioner - Google Patents

Abstract

An air conditioner, comprising an outdoor unit (100) and an indoor unit (200). The outdoor unit (100) comprises a compressor (110) and an outdoor side heat exchanger (141). The indoor unit (200) comprises a first heat exchanger (220) and a first throttling adjusting device (240). The air conditioner further comprises: a discharge pipe (111), a low-pressure suction pipe (113), a first piping (140) and a second piping (150). The outdoor unit (100) further comprises a first switching device (131). The air conditioner further comprises an economizer (143), the economizer (143) being provided on the first piping (140) between the outdoor side heat exchanger (141) and the first throttling adjusting device (240); a first refrigerant flow passage (143a) and a second refrigerant flow passage (143b) are provided in the economizer (143), and the first refrigerant flow passage (143a) is connected in the first piping (140) by means of a refrigerant bridge (600); the second refrigerant flow passage (143b) has one end in communication with the first piping (140) by means of a liquid taking pipe (145), and the other end simultaneously in communication with a medium-pressure suction inlet (M) and the low-pressure suction pipe (113) of the compressor (110) by means of a return pipe (146), such that flow directions of a refrigerant in the first refrigerant flow passage (143a) and the second refrigerant flow passage (143b) are opposite. The air conditioner ensures the heat exchange effect of the first refrigerant flow passage and the second refrigerant flow passage, and is advantageous in ensuring, in a heating mode, a gas supplement effect of the economizer to the compressor, thereby ensuring heating capacity of the air conditioner in a low-temperature environment.

Description

Air conditioner

Cross-references to related applications

This application requires that it be submitted to the Chinese Patent Office on October 28, 2019, the application number is 201911034323.1, the name of the invention is "air conditioner", and the application number is 201921830849.6 and the utility model name is " The priority of the Chinese patent application for "air conditioner", the entire content of which is incorporated in this application by reference.

Technical field

The present invention relates to the technical field of air conditioners, in particular to an air conditioner.

Background technique

With the improvement of people's living standards and the demand for energy saving, the application of air-jet increased enthalpy refrigerant systems has become more and more extensive, especially in the application of coal-to-electricity conversion in the north and the application of multiple connections. In addition, for multi-line systems or other refrigerant systems, due to the application of longer connecting pipes and the throttling device on the inner side of the machine, many systems will be equipped with a secondary subcooling device to reduce pipeline pressure loss and inner machine joints. Flow noise. When the application of a refrigerant system requires both jet enthalpy and secondary subcooling, an economizer can be shared. However, since the flow of the cooling and heating refrigerants is opposite, there must be one direction. The economizer is a downstream heat exchange. In this way, the heat exchange temperature difference is small, and the heat exchange efficiency is reduced.

Summary of the invention

The main purpose of the present invention is to provide an air conditioner, which aims to enable the air conditioner to have a higher heating capacity in a low temperature environment on the premise that the air conditioner has a constant temperature and dehumidification function.

To achieve the above objective, the air conditioner proposed by the present invention includes an outdoor unit and an indoor unit, the outdoor unit includes an enthalpy compression mechanism and an outdoor heat exchanger, and the indoor unit includes a first heat exchanger and a first throttling regulator. Device

The air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low pressure suction pipe connected to the low pressure suction side of the compression mechanism, the discharge pipe, the outdoor heat exchanger, and the The first throttle adjusting device, the first pipe of the first heat exchanger, and the second pipe connecting the first heat exchanger and the low-pressure suction pipe to form a refrigerant circuit;

The outdoor unit further includes a first switching device that can switch between a first switching state of the first switching device and a second switching state of the first switching device. In the first switching state, the The first switching device connects the first pipe with the suction pipe and connects the second pipe with the discharge pipe. In the second switching state, the first switching device causes the first The pipe is in communication with the discharge pipe and the second pipe is in communication with the suction pipe;

The air conditioner further includes an economizer, the economizer is arranged on the first pipe between the outdoor heat exchanger and the first throttling device; the economizer is provided with a first refrigerant flow path and a second refrigerant flow The first refrigerant flow path is connected to the first piping through a refrigerant bridge; one end of the second refrigerant flow path is connected to the first piping through a liquid intake pipe, and the other end is simultaneously sucked into the medium pressure of the compressor through a return pipe The port is communicated with the suction pipe; so that the refrigerant flow in the first refrigerant flow path and the second refrigerant flow path are opposite to each other.

In some embodiments, the refrigerant bridge has a first passage, a second passage, and a refrigerant passage connecting the first passage and the second passage, and the refrigerant bridge passes through the first passage and the second passage. Connect to the first pipe.

In some embodiments, the refrigerant bridge has a third passage and a fourth passage, and two ends of the first refrigerant flow passage are respectively connected to the third passage and the fourth passage;

The first crossing and the third crossing are connected through the first bridge section, and the first bridge section unidirectionally leads from the first crossing to the third crossing;

The third crossing and the second crossing are connected through the second bridge section, and the second bridge section unidirectionally leads from the second crossing to the third crossing;

The second crossing and the fourth crossing are connected through the third bridge section, and the third bridge section unidirectionally leads from the fourth crossing to the second crossing;

The fourth crossing and the first crossing are connected through a fourth bridge section, and the fourth bridge section unidirectionally leads from the fourth crossing to the first crossing.

In some embodiments, the refrigerant bridge has a third passage and a fourth passage, and two ends of the first refrigerant flow passage are respectively connected to the third passage and the fourth passage;

The first crossing and the third crossing are connected through the first bridge section, and the first bridge section unidirectionally leads from the third crossing to the first crossing;

The third crossing and the second crossing are connected through the second bridge section, and the second bridge section unidirectionally leads from the third crossing to the second crossing;

The second crossing and the fourth crossing are connected through the third bridge section, and the third bridge section unidirectionally leads from the second crossing to the fourth crossing;

The fourth crossing and the first crossing are connected through a fourth bridge section, and the fourth bridge section is unidirectionally leading from the first crossing to the fourth crossing.

In some embodiments, one-way valves are provided on the first bridge section, the second bridge section, the third bridge section, and the fourth bridge section.

In some embodiments, a liquid intake throttle valve is provided on the liquid intake pipe.

In some embodiments, the return pipe includes a return pipe body, a first communication pipe and a second communication pipe;

One end of the first communication pipe is in communication with the return pipe body, and the other end is in communication with the medium pressure suction port of the compressor; the return pipe body or the first communication pipe is provided with a first control valve;

One end of the second communication pipe is communicated with the air return pipe body, the other end is communicated with the suction pipe, and a second control valve is arranged on the second communication pipe.

In some embodiments, the inflow end of the liquid intake pipe is in communication with the first pipe between the economizer and the outdoor heat exchanger, or,

The inflow end of the liquid taking pipe is in communication with the first pipe between the economizer and the first indoor throttle adjustment device.

In some embodiments, the connection between the inflow end of the liquid taking pipe and the first pipe has a liquid taking port, and the liquid taking port is located below the first pipe on the periphery thereof.

In some embodiments, the air conditioner further includes a liquid-taking structure having a liquid-taking cavity and a first refrigerant port, a second refrigerant port and a liquid-taking port communicating with the liquid-taking cavity, so The liquid intake is located below the first refrigerant through port and the second refrigerant through port.

In some embodiments, the air conditioner further includes a second heat exchanger, a second throttle adjustment device, a third pipe, and a branch pipe branched from the discharge pipe, and the third pipe connects the The first intersection of the first pipe, the second throttle adjustment device, the second heat exchanger, and the branch pipe are connected in sequence, wherein the first intersection is located at the first throttle Between the adjusting device and the outdoor heat exchanger, the economizer is located on the first pipe between the first intersection and the outdoor heat exchanger.

In some embodiments, the third pipe is in communication with the branch pipe, and a third control valve is provided on the branch pipe to control the on-off of the branch pipe; and the third pipe is in communication with the low-pressure suction pipe through the connecting pipe Or it is connected to the second pipe, and the communication pipe is provided with a fourth control valve to control the on and off of the first communication pipe.

In some embodiments, the air conditioner further includes a second switching device that can switch between the third switching state and the fourth switching state of the second switching device,

In the third switching state, the second switching device connects the third pipe with the branch pipe,

In the fourth switching state, the second switching device connects the third pipe with the suction pipe.

In some embodiments, the air conditioner further includes an outdoor-side throttling adjustment device, and the outdoor-side throttling adjustment device is located on the first pipe between the economizer and the outdoor-side heat exchanger.

In some embodiments, the air conditioner further includes: a first connecting pipe branching from a second intersection of the first pipe, and a second connecting pipe branching from the second pipe, The second intersection is located between the first throttle adjustment device and the outdoor heat exchanger, the air conditioner further includes a plurality of indoor units, and the plurality of indoor units are connected in parallel at the first connection Tube and the second connecting tube.

In some embodiments, the economizer includes a plate heat exchanger or a double-pipe heat exchanger, and the plate heat exchanger or double-pipe heat exchanger has a first end and a second end that are arranged oppositely, so The first refrigerant flow path enters from the first end and protrudes from the second end, and the second refrigerant flow path enters from the second end and protrudes from the first end;

Alternatively, the first refrigerant flow path enters from the second end and protrudes from the first end, and the second refrigerant flow path enters from the first end and protrudes from the second end.

In the technical solution of the present invention, by connecting the refrigerant inflow end of the first refrigerant flow path of the economizer with the refrigerant bridge, and setting the flow direction of the second refrigerant flow path, the refrigerant in the first refrigerant flow path and the second refrigerant flow path The flow direction is always opposite (no matter in the heating mode in which the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger, or in the cooling mode in which the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger), in this way, the first is fully maintained. The temperature difference between the refrigerant in the first refrigerant flow path and the second refrigerant flow path ensures the heat exchange effect of the first refrigerant flow path and the second refrigerant flow path, which helps to ensure that the economizer compensates the compressor in the heating mode. The air-conditioning effect ensures the heating capacity of the air conditioner in a low temperature environment; at the same time, it helps to ensure the liquefaction effect (exhaust effect) of the economizer on the refrigerant in the cooling mode, and ensures that the refrigerant entering the indoor throttle device is liquid. So as to eliminate the abnormal sound generated in the process of indoor throttling.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

Fig. 1 is a schematic structural diagram of an embodiment of an air conditioner of the present invention;

Figure 2 is a schematic structural diagram of another embodiment of the air conditioner of the present invention;

3 is a schematic diagram of the internal structure of the next embodiment of the heating mode at A in FIG. 2;

4 is a schematic diagram of the internal structure of the next embodiment of the cooling mode at A in FIG. 2;

Fig. 5 is a schematic structural diagram of another embodiment in the heating mode at A in Fig. 2;

Fig. 6 is a schematic structural diagram of another embodiment in the cooling mode at A in Fig. 2;

Figure 7 is a partial enlarged view of an embodiment of the connection between the liquid intake pipe and the first pipe of the air conditioner of the present invention;

Fig. 8 is a partial enlarged view of another embodiment of the connection between the liquid intake pipe and the first pipe of the air conditioner of the present invention;

9 is a partial enlarged view of another embodiment of the connection between the liquid intake pipe and the first pipe of the air conditioner of the present invention;

Fig. 10 is a partial enlarged view of another embodiment of the connection between the liquid intake pipe and the first pipe of the air conditioner of the present invention.

Attached icon number description:

Label	name	Label		name
100	Outdoor unit	110	compressor
111	Discharge pipe	112	Bifurcated pipe
113	Low pressure suction pipe	114	Unicom tube
120	Gas-liquid separator	131	First switching device
132	Second switching device	133	First control valve
134	First point	140	The first piping
141	Outdoor heat exchanger	142	Outdoor throttling regulator

143	Economizer	144	Liquid intake throttle
143a	The first refrigerant flow path	143b	The second refrigerant flow path
145	Take the liquid tube	146	Return pipe
147	Second connecting pipe	148	The first connecting pipe
149	Second control valve	150	Second piping
160	The third piping	135	Second point
200	Indoor unit	210	Second heat exchanger
220	The first heat exchanger	230	Second throttle adjustment device
240	The first throttle regulating device	250	Second connecting pipe
260	The first connecting pipe	211	First intersection
212	Second intersection	P	exhaust vent
M	Medium pressure suction port	S	Low pressure suction port
310	The third control valve	320	Fourth control valve
510	First end	520	Second end
600	Refrigerant Bridge Road	610	First pass
620	Second pass	630	Third pass
640	Fourth crossing	650	First bridge
660	Second bridge	670	Third bridge
680	Fourth bridge	Q	First junction
800	Liquid taking structure	810	Liquid taking cavity
820	The second refrigerant port	830	The first refrigerant port
840	Liquid intake	690	Check valve

The realization of the objectives, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between components in a specific posture (as shown in the accompanying drawings). If the relative position relationship, movement situation, etc. change, the directional indication will change accordingly.

The specific structure of the air conditioner will be mainly described below.

1 to 4, the entire pipeline structure and component settings of the air conditioner are first introduced; in the embodiment of the present invention, the air conditioner includes an outdoor unit 100 and an indoor unit 200, and the outdoor unit 100 includes a compressor 110 and a room. Outer heat exchanger 141, the indoor unit 200 includes a first heat exchanger 220 and a first throttle adjustment device 240;

The air conditioner further includes: a discharge pipe 111 connected to the discharge side of the compressor 110, a low pressure suction pipe 113 connected to the low pressure suction side of the compressor 110, and the discharge pipe 111, the discharge pipe 111, and the The outdoor side heat exchanger 141, the first throttle adjusting device 240, the first pipe 140 of the first heat exchanger 220, and the connection connecting the first heat exchanger 220 and the low-pressure suction pipe 113 The second piping 150 constitutes a refrigerant circuit;

The outdoor unit 100 further includes a first switching device 131, which can switch between the first switching state of the first switching device 131 and the second switching state of the first switching device 131,

In the first switching state, the first switching device 131 connects the first pipe 140 with the suction pipe and connects the second pipe 150 with the discharge pipe 111. In the switching state, the first switching device 131 connects the first pipe 140 with the discharge pipe 111 and connects the second pipe 150 with the suction pipe.

Through the setting of the first switching device 131, in the first switching state, the air conditioner is in a heating state, that is, the first heat exchanger 220 is heating; in the second switching state, the air conditioner is in a cooling state. The first switching device 131 may be a four-way valve.

The air conditioner further includes an economizer 143, which is provided on the first pipe 140 between the outdoor heat exchanger 141 and the first throttle device; the economizer 143 is provided with a first refrigerant flow 143a and a second refrigerant flow path 143b. The first refrigerant flow path 143a is connected to the first pipe 140 through a refrigerant bridge 600; one end of the second refrigerant flow path 143b communicates with the first pipe 140 through a liquid intake pipe 145 , The other end is communicated with the intermediate pressure suction port and suction pipe of the compressor 110 through the return pipe 146 at the same time; so that the refrigerant in the first refrigerant flow path 143a and the second refrigerant flow path 143b flow in opposite directions.

Regarding the operation of the economizer 143, in the heating mode, when the first switching device 131 is in the first state, the discharge pipe 111 communicates with the second pipe 150, so that the high-temperature and high-pressure refrigerant passes through the discharge pipe 111 and the second pipe 150 and enters It goes to the first heat exchanger 220 for heating, and then flows into the refrigerant bridge 600 through the first pipe 140, enters the first refrigerant flow path 143a of the economizer 143 after the action of the refrigerant bridge 600, and passes through the first refrigerant flow The passage 143a then flows back to the first pipe 140, passes through the outdoor throttle valve and the outdoor side heat exchanger 141, and flows back to the compressor 110 from the low pressure suction port through the suction pipe. The second refrigerant flow path 143b of the economizer 143 passes through the plate heat exchanger and exchanges heat with the first refrigerant flow path 143a after taking the liquid, and then flows back to the medium pressure suction pipe of the compressor 110 through the return pipe 146. At the same time, the communication between the return pipe 146 and the suction pipe is cut off, so that the compressor 110 is supplemented to improve the heating capacity of the compressor 110 in a low temperature environment;

In the cooling mode, when the first switching device 131 is in the second state, the discharge pipe 111 communicates with the first pipe 140, and the high-temperature and high-pressure refrigerant passes through the discharge pipe 111 and the first pipe 140 and enters the outdoor heat exchanger 141. After passing through the outdoor side heat exchanger 141, it passes through the outdoor throttle, and then enters the first refrigerant flow path 143a of the economizer 143 through the refrigerant bridge 600, and the first refrigerant flow path 143a flows back to the first piping after passing through the plate heat exchanger In 140, it enters the first indoor throttling device along the first pipe 140 and enters the first heat exchanger 220 for refrigeration; the inflow end of the second refrigerant fluid is connected to the first pipe 140, and the refrigerant passes through the plate heat exchanger and the second heat exchanger. After the refrigerant in a refrigerant flow path 143a undergoes heat exchange (heat exchange through a plate heat exchanger), it flows back to the low-pressure suction port of the compressor 110 through the return pipe 146 and the suction pipe, so that it passes through the economizer 143, the first The refrigerant entering the room by the pipe 140 is in a liquid state, so as to prevent the indoor throttling device from generating harsh noises during throttling.

The economizer 143 includes a plate heat exchanger or a double-pipe heat exchanger. The plate heat exchanger or the double-pipe heat exchanger has a first end 510 and a second end 520 opposite to each other. The first refrigerant The flow path 143a enters from the first end 510 and extends from the second end 520, and the second refrigerant flow path 143b enters from the second end 520 and extends from the first end 510; or, the first refrigerant flow path 143a extends from The second end 520 enters and extends from the first end 510, and the second refrigerant flow path 143b enters from the first end 510 and extends from the second end 520. The refrigerant in the first refrigerant flow path 143a and the refrigerant in the second refrigerant flow path 143b exchange heat by a plate heat exchanger or a double tube heat exchanger. Since the first refrigerant flow path 143a and the second refrigerant flow path 143b flow in opposite directions, the temperature difference of the refrigerant in the first refrigerant flow path 143a and the second refrigerant flow path 143b is kept maximum, thereby ensuring the heat exchange effect.

Regarding the refrigerant bridge 600, there can be many ways of the refrigerant bridge 600, as long as the refrigerant passes through the first pipe 140 (regardless of whether the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger 141 or the outdoor heat exchanger 141 To the indoor heat exchanger), the flow direction of the refrigerant in the first refrigerant flow path 143a and the direction of the refrigerant flow in the second refrigerant flow path 143b are always opposite to increase the temperature difference and ensure the heat exchange effect.

In this embodiment, by connecting the refrigerant inflow end of the first refrigerant flow path 143a of the economizer 143 with the refrigerant bridge 600, and setting the flow direction of the second refrigerant flow path 143b, the first refrigerant flow path 143a and the second refrigerant flow The flow direction of the refrigerant in the path 143b is always opposite (no matter in the heating mode where the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger 141, or in the cooling mode where the refrigerant flows from the outdoor heat exchanger 141 to the indoor heat exchanger ), in this way, the temperature difference of the refrigerant in the first refrigerant flow path 143a and the second refrigerant flow path 143b is sufficiently maintained, thereby ensuring the heat exchange effect of the first refrigerant flow path 143a and the second refrigerant flow path 143b, which is beneficial to Ensure the air supplement effect of the economizer 143 on the compressor 110 in the heating mode, thereby ensuring the heating capacity of the air conditioner in a low temperature environment; at the same time, it is beneficial to ensure the liquefaction effect of the economizer 143 on the refrigerant in the cooling mode (exhaust air). Air effect) to ensure that the refrigerant entering the indoor throttling device is liquid, so as to eliminate the abnormal sound generated during the indoor throttling process.

It is worth noting that the concept of the present invention can not only be used in traditional air conditioners, but also can be applied to a situation where multiple indoor heat exchangers are provided in the same indoor unit 200, and can also be applied to a refrigerant system with multiple indoor heat exchangers. In the case of the indoor unit 200. As the complexity of the structure of a single indoor unit 200 increases, or the number of indoor units 200 increases, the length of the refrigerant pipeline will increase, which will make the noise elimination effect of the present invention more obvious.

The following describes a situation where multiple indoor heat exchangers are provided in a single indoor unit 200:

The indoor unit 200 further includes a second heat exchanger 210, a second throttling device 230, and a heat circulation device for sending heat or cold of the indoor unit 200 into the room;

The air conditioner further includes a third pipe 160 and a branch pipe 112 branched from the discharge pipe 111. The third pipe 160 connects the first intersection 211 of the first pipe 140 and the second The throttle adjustment device 230, the second heat exchanger 210, and the branch pipe 112 are connected in sequence to form a refrigerant circuit. The first intersection 211 is located between the first throttle adjustment device 240 and the branch pipe 112. Between the outdoor side heat exchangers 141. The economizer 143 is located on the first pipe 140 between the first intersection 211 and the outdoor heat exchanger 141.

Among them, the thermal cycle device may be a wind wheel in some embodiments, and the rotation of the wind wheel transports the air after heat exchange with the initial heat exchanger and the second heat exchanger 210 to the room. Of course, in other embodiments, the thermal cycle device may also be a water cycle device, and the first heat exchanger 220 and the second heat exchanger 210 send heat or cold into the room through circulating water flowing in the water cycle device.

On the basis of the above-mentioned pipeline, the air conditioner can realize cooling by the first heat exchanger 220 and heating by the second heat exchanger 210, so that constant temperature dehumidification can be realized. Wherein, the first throttle adjustment device 240 includes an electromagnetic throttle valve, such as an electromagnetic expansion valve, and the second throttle adjustment device 230 includes an electromagnetic throttle valve, such as an electromagnetic expansion valve. In the second state, the first switching device 131 handles the cooling in the first heat exchanger 220. At this time, the refrigerant is discharged from the discharge pipe 111 and enters the second heat exchanger 210 through the branch pipe 112 and the third pipe 160. The heat exchanger 210 generates heat. After the refrigerant flows out of the second heat exchanger 210, it flows into the second pipe 150, and passes through the refrigerant bridge 600, the economizer 143, the outdoor heat exchanger 141, and the suction along the second pipe 150. The pipe returns to the low-pressure suction port of the compressor 110.

In some other embodiments, the air conditioner further includes a second switching device 132, which can switch between the third switching state and the fourth switching state of the second switching device 132. In the three switching state, the second switching device 132 connects the third pipe 160 with the branch pipe 112, and in the fourth switching state, the second switching device 132 causes the third pipe 160 communicates with the suction pipe.

Through the setting of the second switching device 132, in the third switching state, the air conditioner is in a constant temperature and dehumidifying state; in the fourth switching state, the air conditioner is in a cooling state, that is, the first heat exchanger 220 and the second heat exchanger 210 At the same time refrigeration. The second switching device 132 may be a four-way valve. Also connected to the second switching device 132 is an auxiliary branch pipe. When the third pipe 160 communicates with the branch pipe 112, the auxiliary branch pipe communicates with the suction pipe; when the third pipe 160 communicates with the low-pressure suction pipe 113, the auxiliary branch pipe communicates with low pressure. The suction pipe 113 and the branch pipe 112. The auxiliary branch pipe is provided with a filter and a capillary tube.

Of course, in some embodiments, the first switching device 131 and the second switching device 132 may exist at the same time, so that the air conditioner can be switched in the three states of constant temperature dehumidification, single heating, and single cooling.

In order to better adjust the subcooling degree of the outdoor side heat exchanger 141, the air conditioner further includes an outdoor side throttling adjustment device 142, the outdoor side throttling adjustment device 142 is located between the economizer 143 and the outdoor side On the first pipe 140 between the heat exchangers 141. The outdoor side throttle adjustment device 142 includes an outdoor throttle valve, such as an electronic expansion valve.

The following describes the specific working conditions of the economizer 143 according to the situation that the room has the first indoor heat exchanger and the second indoor heat exchanger:

In order to improve the ability of the air conditioner to heat at low temperatures, the air conditioner further includes an economizer 143; the economizer 143 is provided on the first pipe 140 between the outdoor side heat exchanger 141 and the first intersection 211, so The return pipe 146 of the economizer 143 communicates with the medium pressure suction port of the compressor 110. The return pipe 146 can have various forms. The return pipe 146 may only include the return pipe 146 body, or it may include the return pipe 146 body and the first communication pipe 148. One end of the first communication pipe 148 is in communication with the return pipe 146 body. , The other end is in communication with the medium-pressure suction port of the compressor 110.

A first control valve 133 is provided on the return pipe 146 or on the first communication pipe 148 between the return pipe 146 and the intermediate pressure suction port of the compressor 110. The compressor 110 at this time is a jet enthalpy-enhancing compressor 110, which has a low-pressure suction port and a medium-pressure suction port. A liquid-taking throttle valve 144 is provided on the liquid-taking pipe 145. In this way, after the compressor 110 exhaust is switched by the first switching device 131 and the second switching device 132, it enters the second heat exchanger 210 (the refrigerant enters through the third pipe 160) and the first heat exchanger 220 (the refrigerant passes through the second A piping 140 enters) for heating. The liquid refrigerant from the second heat exchanger 210 and the first heat exchanger 220 passes through the economizer 143 and is divided into two parts: the first part (passes through the refrigerant bridge 600 and the first refrigerant flow path) 143a) Directly pass the outdoor side throttling regulator 142 (electronic expansion valve) throttling and pressure reduction, then enter the outdoor side heat exchanger 141 to evaporate and absorb heat, and the second part (via the second refrigerant flow path 143b) passes through the liquid intake throttle valve 144 (Electronic Expansion Valve) throttling and depressurizing, and then enters the economizer 143 through the liquid pipe 145 to absorb heat and evaporate. The evaporated medium-pressure saturated steam passes through the return pipe 146, the first control valve 133 and the connecting pipe enter the compressor 110 The medium-pressure suction port is mixed with the refrigerant at the low-pressure suction port of the compressor 110 and compressed together, which solves the problems of low refrigerant flow, low return pressure, and high compression ratio in low-temperature environments, and improves low-temperature heating and system reliability. Sex. Through the technology of the present invention, when the outdoor environment temperature is low, the system design of the jet enthalpy compressor 110 and the economizer 143 can increase the refrigerant suction volume of the compressor 110 under the low temperature environment, thereby increasing the low temperature heating capacity and reducing the low temperature. The compression ratio under the environment can improve the reliability of the system.

In order to improve the liquid extraction effect, the inflow end of the liquid extraction tube 145 is in communication with the first pipe 140 between the economizer 143 and the outdoor heat exchanger 141. In other embodiments, the inflow end of the liquid extraction tube 145 may also be Between the economizer 143 and the first intersection 211 (in the absence of the first intersection 211, the inflow end of the liquid intake pipe 145 communicates with the first pipe 140 between the economizer 143 and the first indoor throttle adjustment device) The first pipe 140 communicates with each other. That is, the refrigerant flows in from the refrigerant outflow end of the economizer 143, which helps to improve the reliability of liquid extraction.

The connection between the inflow end of the liquid taking pipe 145 and the first piping 140 is called the liquid taking point. Regarding the selection of the liquid taking point, under different working conditions, choosing the corresponding liquid taking point will be beneficial to different working conditions. . When the inflow end of the liquid taking pipe 145 is in communication with the first pipe 140 between the economizer 143 and the outdoor side heat exchanger 141, the connection position is called the first liquid taking point 134, or the upstream liquid taking point; When the inflow end of the liquid intake pipe 145 is connected to the first pipe 140 between the economizer 143 and the first intersection 211 (or the first indoor throttle adjustment device), the connection position is called the second liquid intake point 135, or This is called the downstream take-out point. When heating in the indoor heat exchanger, when the jet enthalpy needs to be turned on, select the first liquid extraction point 134 or the upstream liquid extraction point to supplement the air to the compressor 110 and improve its heating capacity in a low temperature environment; When the heater is used for cooling or constant temperature dehumidification (or dehumidification and reheating), select the second liquid extraction point 135 or the downstream liquid extraction point to make the refrigerant entering the indoor unit 200 liquid as much as possible, so as to avoid the occurrence of indoor throttling. Different sound.

7 to 10, in some embodiments, in order to ensure the effect of taking liquid, the connection between the inflow end of the liquid taking tube 145 and the first pipe 140 has a liquid taking port 840, and the liquid taking port 840 is located Below the first pipe 140 around the liquid port 840. By setting the position of the liquid intake 840 to be lower than that of the first pipe 140, the liquid refrigerant flows along the lower pipe wall of the first pipe 140 (the density of the liquid refrigerant is greater than the density of the gaseous state), so that the refrigerant passes through the liquid intake At 840 hours, the liquid refrigerant preferentially enters under the action of gravity, so as to ensure that the refrigerant taken by the liquid intake port 840 is liquid.

There are many ways to form the liquid taking port 840. For example, a liquid taking structure 800 is provided at the junction of the liquid taking pipe 145 and the first pipe 140. The liquid taking structure 800 has a liquid taking cavity 810 and a liquid taking cavity 810 connected to it. The three refrigerant ports are a first refrigerant port 830, a second refrigerant port 820, and a liquid intake port 840. The liquid intake port 840 is located below the first refrigerant port 830 and the second refrigerant port 820. Both the first refrigerant through port 830 and the second refrigerant through port 820 are in communication with the first pipe 140, and the liquid intake port 840 is in communication with the inflow end of the liquid intake pipe 145. Specifically, the first refrigerant port 830 communicates with the first pipe 140 close to the outdoor heat exchanger, and the second refrigerant port 820 communicates with the first pipe 140 close to the first indoor throttle adjustment device. The liquid taking port 840 is located at the bottom of the liquid taking structure 800. The liquid taking structure 800 can have various shapes, such as a rectangular parallelepiped, a cube, a columnar shape, and so on. The first refrigerant port 830 and the second refrigerant port 820 may be located at the two ends or the top of the liquid taking structure 800. Of course, in some embodiments, the first pipe 140 may also pass through the first refrigerant port 830 and the second refrigerant port 830. The opening 820 extends into the liquid taking cavity 810.

In some other embodiments, in order to prevent the vapor-liquid two-phase refrigerant from generating unpleasant noises when passing through the indoor throttling device, the air conditioner further includes a gas-liquid separator 120 and an economizer 143. The gas-liquid separator The economizer 120 is installed on the low-pressure suction pipe 113; the economizer 143 is installed on the first pipe 140 between the outdoor heat exchanger 141 and the first intersection 211, and the return pipe 146 of the economizer 143 is connected to the The gas-liquid separator 120 is in communication. The return pipe 146 can have various forms. The return pipe 146 may include only the return pipe 146 body, or may include the return pipe 146 body and the second communication pipe 147. One end of the second communication pipe 147 is in communication with the return pipe 146 body. , The other end is in communication with the gas-liquid separator 120. In order to facilitate control, in some examples, the return pipe 146 communicates with the gas-liquid separator 120 through the low-pressure suction pipe 113, and the return pipe 146 or the second connecting pipe 250 between the return pipe 146 and the low-pressure suction pipe 113 is connected to the gas-liquid separator 120. A second control valve 149 is provided.

The present invention adopts the system design with economizer 143 on the basis of three pipes and controls the liquid intake throttle valve 144 (electronic expansion valve) in the system design circuit with economizer 143 to further reduce the outlet of outdoor heat exchanger 141. Condensing temperature of the refrigerant to increase the degree of subcooling, so that the refrigerant is completely condensed into a liquid 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. When the refrigerant passing through the indoor throttling device is fully liquid, It can solve the abnormal noise of the refrigerant produced by the gas-liquid two-phase state.

After the compressor 110 exhaust is switched by the first switching device 131, the high-pressure and high-temperature gas refrigerant enters the outdoor side heat exchanger 141 for condensation and heat exchange, and the gas-liquid two-phase medium temperature and high-pressure refrigerant from the outdoor side heat exchanger 141 enters the economy After the device 143 is divided into two parts: the first part is throttled and depressurized by the liquid intake throttle valve 144, and then enters the economizer 143 to absorb heat and evaporate. The evaporated gaseous refrigerant passes through the return pipe 146, and the second control valve 149 (Solenoid valve) and the connecting pipe enter the gas-liquid separator 120 and mix with the gaseous refrigerant after the heat absorption and evaporation of the indoor heat exchanger, and then enter the suction port of the compressor 110 together. The second part is further condensed and exchanged from the economizer 143. , The gas-liquid two-phase refrigerant becomes pure liquid refrigerant. This part of the pure liquid refrigerant flows into the room, passes through the dehumidification throttle valve and the reheat throttle valve, and then enters the first heat exchanger 220 and the second heat exchanger respectively. The heat exchanger 210 performs heat absorption and evaporation. Since the state of the refrigerant entering the first throttle adjustment device 240 and the second throttle adjustment device 230 (electronic expansion valve) has changed from a gas-liquid two-phase state to a pure liquid state, it is solved that the gas-liquid two-phase refrigerant passes through the throttling device The abnormal sound of the refrigerant produced.

In this embodiment, through the technical solution of the present invention, the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger 141 can be further reduced, the degree of subcooling can be increased, and the refrigerant can be completely condensed from the gas-liquid two-phase state to the liquid state, and the liquid refrigerant passes through the indoor electronics. The expansion valve (the first throttle regulating device 240 and the second throttle regulating device 230) throttling and depressurizing, enter the indoor heat exchanger to absorb heat and evaporate, and pass through the indoor throttle device (the first throttle regulating device 240 and the second throttle When the refrigerant of the flow regulating device 230) is fully liquid, it can solve the problem of refrigerant noise caused by the gas-liquid two-phase refrigerant passing through the throttling device, and improve user satisfaction

It is worth noting that in some embodiments, the return pipe 146 is connected to the intermediate pressure suction port of the compressor 110 and the gas-liquid separator 120 through different connecting pipes. At this time, the two connecting pipes (the first connecting pipe 148 and the second connecting pipe 148 and the second connecting pipe 148) respectively communicate with the intermediate pressure suction port of the compressor 110 and the gas-liquid separator 120. The communication pipe 147) is respectively provided with a first control valve 133 (close to the compressor 110) and a second control valve 149 (close to the gas-liquid separator 120). The return pipe 146 at this time includes a return pipe 146 body and two communicating pipes. In the heating mode, close the second control valve 149 and open the first control valve 133 to allow refrigerant to flow into the compressor 110 to improve heating capacity; in the cooling mode or constant temperature dehumidification mode, close the first control valve 133 and open The second control valve 149 to eliminate abnormal sound. Of course, in some embodiments, due to special operating conditions, the second control valve 149 can also be closed and the first control valve 133 can be opened. This setting allows the air conditioner to adjust the first control valve 133 and the second control valve 149 according to specific conditions, thereby increasing the heating capacity of the air conditioner in heating mode, and reducing noise in cooling and constant temperature dehumidification modes.

Regarding the specific connection between the compressor 110 and the economizer 143, the compressor 110 is a jet enthalpy-enhancing compressor 110. In addition to the conventional high-pressure exhaust port P, low-pressure suction port S, and medium-pressure suction port M, the compressor 110 (That is, the steam injection port), the medium-pressure refrigerant vapor enters the compressor 110 through the steam injection port to increase the effective flow of the refrigerant.

Port a of the economizer 143 is connected to the third crossing port 630 of the refrigerant bridge 600, port b of the economizer 143 is connected to the fourth crossing port 640 of the refrigerant bridge 600, and port c of the economizer 143 is connected to the liquid intake pipe 145 , The d port of the economizer 143 is connected to the return pipe 146, the liquid intake throttle valve 144 is connected in series to the liquid intake pipe 145, the first control valve 133 is connected in series to the connecting pipe, and the second control valve 149 is connected in series to another connection On the pipe, one end of the communicating pipe is connected to the medium pressure suction port M of the compressor 110, and the other communicating pipe is connected to the inlet end of the gas-liquid separator 120.

In some embodiments, the air conditioner further includes a plurality of indoor units 200. The heat exchangers included in each indoor unit 200 may be of different forms. For example, it may include an internal unit with a constant temperature and dehumidification function (with the first heat exchanger 220 and the first heat exchanger 220 at the same time). Two heat exchanger 210), an ordinary cooling/heating internal machine (only one heat exchanger and corresponding throttling device), and an internal machine with a conversion device that can freely switch the cooling or heating state, one of them Or multiple, so that the air conditioner can perform mixed operation of constant temperature dehumidification, cooling, heating, etc. at the same time.

Specifically, the air conditioner further includes: a first connecting pipe 260 branching from the second intersection 212 of the first pipe 140, and a second connecting pipe 250 branching from the second pipe 150 , The second intersection 212 is located between the first throttle adjustment device 240 and the outdoor side heat exchanger 141, the air conditioner further includes a plurality of indoor units 200, and the plurality of indoor units 200 are connected in parallel It is connected to the first connecting pipe 260 and the second connecting pipe 250.

In some embodiments, in order to improve the reliability of the second switching device 132, the second switching device 132 does not use a four-way valve, but uses two solenoid valves for control. Specifically, the third pipe 160 is in communication with the branch pipe 112, and is in communication with the low-pressure suction pipe 113 or the second pipe 150, the branch pipe 112 is provided with a third control valve 310, and the third pipe 160 passes through the connecting pipe. 114 is in communication with the low-pressure suction pipe 113 or with the second pipe 150, and the communication pipe 114 is provided with a fourth control valve 320. It is worth noting that the end of the communication pipe 114 away from the third pipe 160 can be connected to the second pipe 150 between the first switching device 131 and the indoor heat exchanger, or can be connected to the first switching device 131 and the gas-liquid separator. The second pipe 150 between 120 communicates. Since the third control valve 310 and the fourth control valve 320 are separate control valves, compared with the four-way valve, the structure is simpler, and the stability and reliability are higher. In addition, the third control valve 310 and the fourth control valve 320 may be solenoid valves. The solenoid valve can still work stably and reliably when the liquid refrigerant enters. In the four-way valve, if the liquid refrigerant enters, the stability of its operation will be affected. Therefore, the independent third control valve 310 and the fourth control valve 310 are used. The control valve 320 can improve the stability and reliability of the operation and state switching of the air conditioner.

It is worth noting that the third control valve 310 and the fourth control valve 320 can be set to their power-off state according to actual operating conditions. Take the third control valve 310 as an example. During the operation of the air conditioner, the third control valve 310 maintains a normally open state for a long time. At this time, the third control valve 310 can be selected as a normally open valve, that is, it is in the off state. In the electrical state, most of its work can be completed. Only when the state of the third control valve 310 needs to be switched, it needs to be powered on; in the same way, if the third control valve 310 remains normally closed for a long time, then Choose it as a normally closed valve. In this way, it is useful to reduce the electrical energy consumed by the second switching device 132 (including the third control valve 310) during the operation of the air conditioner, thereby facilitating the rational use of energy.

In some embodiments, in order to simplify the pipeline structure, the third pipe 160, the branch pipe 112, and the connecting pipe 114 are connected to the first connection Q. Of course, the low-pressure suction pipe 113 can be connected to the other two pipes through the connecting pipe 114. Connected. At this time, a three-way valve can be provided at the first connection Q instead of two two-way valves. The three-way valve realizes that the third pipe 160 communicates with the communicating pipe 114 and the branch pipe 112 respectively, and can control the on and off of the communicating pipe 114 and the branch pipe 112 respectively. In this way, it is beneficial to improve the third pipe 160, the communicating pipe 114 and the branch pipe 112. The convenience of connecting the branch pipe 112.

Cooling mode:

The high-temperature and high-pressure refrigerant is discharged from the exhaust pipe, passes through the first switching device 131, the first pipe 140, the outdoor heat exchanger 141, and the economizer 143 in sequence, and then enters the evaporative heat exchanger and the first heat exchanger 220 respectively Perform refrigeration. One part flows out of the first heat exchanger 220, passes through the second pipe 150 and the first switching device 131 (in some embodiments, there may be no), and flows into the gas-liquid separator 120; the other part flows out of the evaporative heat exchanger and passes through the first After the three pipes 160 enter the communication pipe 114, when the communication pipe 114 is connected to the low pressure suction pipe 113, the refrigerant enters the gas-liquid separator 120 through the low pressure suction pipe 113; when the communication pipe 114 is connected to the second pipe 150, the refrigerant passes The communication pipe 114 flows into the second pipe 150 and flows into the gas-liquid separator 120 through the second pipe 150. During this process, the third control valve 310 is closed, and the fourth control valve 320 is opened.

Heating mode:

The high-temperature and high-pressure refrigerant is discharged from the exhaust pipe, and part of it passes through the first switching device 131 (which may not be available in some embodiments), the second pipe 150 and then enters the first heat exchanger 220 for heating, from the first heat exchange The heat exchanger 220 flows out and enters the first pipe 140; the other part passes through the branch pipe 112 and the third pipe 160 to enter the second heat exchanger 210 for heating, and flows out of the second heat exchanger 210 and then enters the first pipe 140 After passing through the economizer 143, the outdoor side heat exchanger 141, and the first switching device 131, it flows into the gas-liquid separator 120. During this process, the third control valve 310 is opened, and the fourth control valve 320 is closed.

Constant temperature dehumidification mode:

The high-temperature and high-pressure refrigerant is discharged from the exhaust pipe, and part of it passes through the first switching device 131 (which may be absent in some embodiments), the first piping 140, the outdoor heat exchanger 141, and the economizer 143 in sequence, and then enters the first heat exchanger Cooling is performed in the heat exchanger 220 and then flows into the gas-liquid separator 120 through the second pipe 150 and the first switching device 131. The other part sequentially enters the second heat exchanger 210 through the branch pipe 112 and the third pipe 160 for heating, and then flows into the first heat exchanger 220 for cooling. During this process, the third control valve 310 is opened, and the fourth control valve 320 is closed.

Regarding the specific method of the refrigerant bridge road 600, the following examples are introduced:

The refrigerant bridge road 600 has a first passage 610, a second passage 620, and a refrigerant passage connecting the first passage 610 and the second passage 620, and the refrigerant bridge 600 passes through the first passage 610 and the second passage 620 is connected to the first pipe 140. Specifically, the first port 610 communicates with the first pipe 140 close to the outdoor heat exchanger 141, and the second port 620 communicates with the first pipe 140 close to the indoor unit 200. The refrigerant bridge 600 also has a second passage 620 and a fourth passage 640, and the refrigerant bridge 600 is connected to the first refrigerant pipeline of the economizer 143 through the second passage 620 and the fourth passage 640. The refrigerant can enter the refrigerant bridge 600 from the first port 610 or the second port 620, flow from the third port 630 (fourth port 640) into the first refrigerant flow path 143a, and pass through the first refrigerant flow path. After 143a, it enters the refrigerant bridge 600 from the fourth port 640 (the third port 630), and then flows into the first pipe 140 from the second port 620 or the first port 610.

There are one-way conduction between adjacent vias. There are many specific conduction methods. The following two specific examples are given for illustration:

In the first type, the refrigerant bridge 600 has a third passage 630 and a fourth passage 640, and two ends of the first refrigerant flow path 143a are respectively connected to the third passage 630 and the fourth passage 640; the first passage 610 and the third crossing 630 are connected through the first bridge section 650, and the first bridge section 650 unidirectionally leads from the first crossing 610 to the third crossing 630; the third crossing 630 and the second crossing 620 pass through the The second bridge section 660 is connected, and the second bridge section 660 unidirectionally leads through the second crossing 620 to the third crossing 630; the second crossing 620 and the fourth crossing 640 are connected through the third bridge 670, and the first The third bridge section 670 unidirectionally leads to the fourth crossing 640 to the second crossing 620; the fourth crossing 640 and the first crossing 610 are connected through the fourth bridge section 680, and the fourth bridge section 680 unidirectionally leads to the fourth Pass 640 to the first pass 610.

Here are two examples for illustration:

3, in the heating mode of the indoor unit, liquid is taken from the first liquid taking point 134 (upstream liquid taking point):

After the refrigerant flows out of the indoor heat exchanger, it enters the first pipe 140, enters the first bridge section 650 through the first passage 610 along the first pipe 140, and enters the first bridge section 650 of the economizer 143 after flowing out from the third passage 630. The refrigerant flow path 143a enters from the first end 510 (in some embodiments, it can also enter from the second end 520 and exit from the first end 510) to the plate heat exchanger or double-pipe heat exchanger, and then from the second The end 520 flows out, and then enters the third bridge section 670 from the fourth passage 640, and then flows out of the refrigerant bridge 600 from the second passage 620 and enters the first piping 140, and then passes through the outdoor side throttle adjustment device 142 and the chamber in turn Outer heat exchanger 141.

After the liquid taking pipe 145 takes liquid from the first liquid taking point 134, it enters the plate heat exchanger or the double-pipe heat exchanger from the second end 520 through the liquid take-out throttle 144, and then flows out from the first end 510 (In some embodiments, it can also enter from the first end 510 and exit from the second end 520, which is opposite to the first refrigerant flow path 143a), then enter the return pipe 146, and return along the return pipe 146 to the medium pressure of the compressor 110 suction point.

4, in the cooling or dehumidification reheating mode of the indoor unit, the liquid is taken from the second liquid extraction point 135 (downstream liquid extraction point):

The refrigerant flows out of the outdoor side heat exchanger 141, enters the first pipe 140, enters the second bridge section 660 through the second passage 620 along the first pipe 140, and enters the economizer 143 after flowing out from the third passage 630 The first refrigerant flow path 143a enters from the first end 510 (in some embodiments, it can also enter from the second end 520 and exit from the first end 510) to the plate heat exchanger or double-pipe heat exchanger after heat exchange. The second end 520 flows out, and then enters the fourth bridge section 680 from the fourth passage 640, and then flows out of the refrigerant bridge 600 from the first passage 610 and enters the first pipe 140, and then enters the indoor heat exchanger.

After the liquid taking pipe 145 takes liquid from the second liquid taking point 135, it enters the plate heat exchanger or the double-pipe heat exchanger from the second end 520 through the liquid take-out throttle 144, and then flows out from the first end 510 (In some embodiments, it can also enter from the first end 510 and exit from the second end 520, which is opposite to the first refrigerant flow path 143a), then enter the return pipe 146, and return to the medium pressure of the compressor 110 along the return pipe 146 suction point.

In the second type, the refrigerant bridge 600 has a third passage 630 and a fourth passage 640, and two ends of the first refrigerant flow path 143a are respectively connected to the third passage 630 and the fourth passage 640; the first passage 610 and the third crossing 630 are connected through the first bridge section 650, and the first bridge section 650 unidirectionally leads through the third crossing 630 to the first crossing 610; the third crossing 630 and the second crossing 620 pass through the The second bridge section 660 is connected, and the second bridge section 660 unidirectionally leads through the third crossing 630 to the second crossing 620; the second crossing 620 and the fourth crossing 640 are connected through the third bridge 670, and the first The third bridge section 670 unidirectionally leads through the second passage 620 to the fourth passage 640; the fourth passage 640 and the first passage 610 are connected through the fourth bridge section 680, and the fourth bridge section 680 unidirectionally leads to the first passage Pass 610 to fourth pass 640.

Here are two examples for illustration:

Referring to Fig. 5, in the heating mode of the indoor unit, liquid is taken from the first liquid taking point 134 (upstream liquid taking point):

After the refrigerant flows out of the indoor heat exchanger, it enters the first pipe 140, enters the fourth bridge section 680 through the first passage 610 along the first pipe 140, and enters the first section of the economizer 143 after flowing out from the fourth passage 640. The refrigerant flow path 143a enters from the second end 520 (in some embodiments, it also enters from the first end 510 and exits from the second end 520) to the plate heat exchanger or double-pipe heat exchanger, and then from the first The end 510 flows out, and then enters the second bridge section 660 from the third passage 630, and then flows out of the refrigerant bridge 600 from the second passage 620 and enters the first pipe 140, and then passes through the outdoor side throttling regulator 142 and the chamber in turn Outer heat exchanger 141.

After the liquid taking pipe 145 takes liquid from the first liquid taking point 134, it enters the plate heat exchanger or the double-pipe heat exchanger from the first end 510 through the liquid take-out throttle 144, and then flows out from the second end 520. (In some embodiments, it can also enter from the second end 520 and exit from the first end 510, which is opposite to the direction of the refrigerant flow in the first refrigerant flow path 143a), then enter the return pipe 146, and return to the compressor 110 along the return pipe 146 Medium pressure suction port.

Referring to Fig. 6, in the cooling or dehumidification reheating mode of the indoor unit, liquid is taken from the second liquid taking point 135 (downstream liquid taking point):

The refrigerant flows out of the outdoor side heat exchanger 141, enters the first pipe 140, enters the third bridge section 670 through the second passage 620 along the first pipe 140, and enters the economizer 143 after flowing out from the fourth passage 640 The first refrigerant flow path 143a enters from the second end 520 (in some embodiments, it can also enter from the first end 510 and exit from the second end 520) to the plate heat exchanger or double-pipe heat exchanger after heat exchange. The first end 510 flows out, and then enters the first bridge section 650 from the third passage 630, and then flows out of the refrigerant bridge 600 from the first passage 610 and enters the first pipe 140, and then enters the indoor heat exchanger.

After the liquid taking pipe 145 takes liquid from the second liquid taking point 135, it enters the plate heat exchanger or the double-pipe heat exchanger from the first end 510 through the liquid take-out throttle 144, and then flows out from the second end 520 (In some embodiments, it can also enter from the second end 520 and exit from the first end 510, which is opposite to the direction of the first refrigerant flow), then enter the return pipe 146, and return to the medium pressure suction of the compressor 110 along the return pipe 146 mouth.

Among them, there are many ways of one-way conduction. Taking the setting of a one-way valve 690 as an example, the first bridge section 650, the second bridge section 660, the third bridge section 670, and the fourth bridge section A one-way valve 690 is provided on the 680 to realize the one-way conduction of each bridge section.

The above descriptions are only the preferred embodiments of the present invention, and do not limit the scope of the present invention. Under the inventive concept of the present invention, equivalent structural transformations made by using the contents of the description and drawings of the present invention, or direct/indirect use All other related technical fields are included in the scope of patent protection of the present invention.

Claims (16)

1. An air conditioner, which includes an outdoor unit and an indoor unit, the outdoor unit includes an enthalpy-increasing compression mechanism and an outdoor heat exchanger, and the indoor unit includes a first heat exchanger and a first throttle adjustment device;

   The air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low pressure suction pipe connected to the low pressure suction side of the compression mechanism, the discharge pipe, the outdoor heat exchanger, and the The first throttle adjusting device, the first pipe of the first heat exchanger, and the second pipe connecting the first heat exchanger and the low-pressure suction pipe to form a refrigerant circuit;

   The outdoor unit further includes a first switching device that can switch between a first switching state of the first switching device and a second switching state of the first switching device. In the first switching state, the The first switching device connects the first pipe with the suction pipe and connects the second pipe with the discharge pipe. In the second switching state, the first switching device causes the first The pipe is in communication with the discharge pipe and the second pipe is in communication with the suction pipe;

   The air conditioner further includes an economizer, the economizer is arranged on the first pipe between the outdoor heat exchanger and the first throttling device; the economizer is provided with a first refrigerant flow path and a second refrigerant flow The first refrigerant flow path is connected to the first piping through a refrigerant bridge; one end of the second refrigerant flow path is connected to the first piping through a liquid intake pipe, and the other end is simultaneously sucked into the medium pressure of the compressor through a return pipe The port is communicated with the suction pipe; so that the refrigerant flow in the first refrigerant flow path and the second refrigerant flow path are opposite to each other.
2. The air conditioner of claim 1, wherein the refrigerant bridge has a first passage, a second passage, and a refrigerant passage connecting the first passage and the second passage, and the refrigerant bridge passes through the first passage. The second port is connected to the first pipe.
3. The air conditioner according to claim 2, wherein the refrigerant bridge has a third passage and a fourth passage, and both ends of the first refrigerant flow passage are respectively connected to the third passage and the fourth passage;

   The first crossing and the third crossing are connected through the first bridge section, and the first bridge section unidirectionally leads from the first crossing to the third crossing;

   The third crossing and the second crossing are connected through the second bridge section, and the second bridge section unidirectionally leads from the second crossing to the third crossing;

   The second crossing and the fourth crossing are connected through the third bridge section, and the third bridge section unidirectionally leads from the fourth crossing to the second crossing;

   The fourth crossing and the first crossing are connected through a fourth bridge section, and the fourth bridge section unidirectionally leads from the fourth crossing to the first crossing.
4. The air conditioner according to claim 2, wherein the refrigerant bridge has a third passage and a fourth passage, and both ends of the first refrigerant flow passage are respectively connected to the third passage and the fourth passage;

   The first crossing and the third crossing are connected through the first bridge section, and the first bridge section unidirectionally leads from the third crossing to the first crossing;

   The third crossing and the second crossing are connected through the second bridge section, and the second bridge section unidirectionally leads from the third crossing to the second crossing;

   The second crossing and the fourth crossing are connected through the third bridge section, and the third bridge section unidirectionally leads from the second crossing to the fourth crossing;

   The fourth crossing and the first crossing are connected through a fourth bridge section, and the fourth bridge section is unidirectionally leading from the first crossing to the fourth crossing.
5. The air conditioner according to claim or 4, wherein the first bridge section, the second bridge section, the third bridge section, and the fourth bridge section are all provided with a one-way valve.
6. The air conditioner according to claim 1, wherein a liquid intake throttle valve is provided on the liquid intake pipe.
7. The air conditioner according to claim 1, wherein:

   The return pipe includes a return pipe body, a first communication pipe and a second communication pipe;

   One end of the first communication pipe is in communication with the return pipe body, and the other end is in communication with the medium pressure suction port of the compressor; the return pipe body or the first communication pipe is provided with a first control valve;

   One end of the second communication pipe is communicated with the air return pipe body, the other end is communicated with the suction pipe, and a second control valve is arranged on the second communication pipe.
8. The air conditioner according to claim 1, wherein the inflow end of the liquid intake pipe communicates with the first pipe between the economizer and the outdoor heat exchanger, or,

   The inflow end of the liquid taking pipe is in communication with the first pipe between the economizer and the first indoor throttle adjustment device.
9. The air conditioner according to claim 1, wherein the connection between the inflow end of the liquid intake pipe and the first pipe has a liquid intake port, and the liquid intake port is located below the first pipe on the periphery thereof.
10. The air conditioner according to claim 9, wherein the air conditioner further comprises a liquid taking structure, the liquid taking structure having a liquid taking cavity and a first refrigerant port, a second refrigerant port communicating with the liquid taking cavity, and The liquid intake is located below the first refrigerant through port and the second refrigerant through port.
11. The air conditioner according to claim 1, wherein the air conditioner further comprises a second heat exchanger, a second throttle adjustment device, a third pipe, and a branch pipe branched from the discharge pipe, the The third piping connects the first intersection of the first piping, the second throttling device, the second heat exchanger, and the branch pipe in sequence, wherein the first intersection is located at the Between the first throttle adjustment device and the outdoor heat exchanger, the economizer is located on the first pipe between the first intersection and the outdoor heat exchanger.
12. The air conditioner according to claim 11, wherein the third pipe is in communication with the branch pipe, and a third control valve is provided on the branch pipe to control the on-off of the branch pipe; and the third pipe passes through the communicating pipe. It is in communication with the low-pressure suction pipe or with the second pipe, and the communication pipe is provided with a fourth control valve to control the on and off of the first communication pipe.
13. The air conditioner according to claim 11, wherein:

    The air conditioner further includes a second switching device that can switch between a third switching state and a fourth switching state of the second switching device,

    In the third switching state, the second switching device connects the third pipe with the branch pipe,

    In the fourth switching state, the second switching device connects the third pipe with the suction pipe.
14. The air conditioner according to claim 1, wherein the air conditioner further comprises an outdoor-side throttling adjustment device, the outdoor-side throttling adjustment device being located at the first position between the economizer and the outdoor-side heat exchanger One piping.
15. The air conditioner according to claim 1, wherein:

    The air conditioner further includes: a first connecting pipe branched from a second intersection of the first pipe, and a second connecting pipe branched from the second pipe, the second intersection located at Between the first throttle adjustment device and the outdoor heat exchanger, the air conditioner further includes a plurality of indoor units connected in parallel to the first connection pipe and the second connection On the tube.
16. The air conditioner according to any one of claims 1 to 15, wherein:

    The economizer includes a plate heat exchanger or a double-pipe heat exchanger, the plate heat exchanger or the double-pipe heat exchanger has a first end and a second end that are arranged oppositely, and the first refrigerant flow path is from The first end enters and extends from the second end, and the second refrigerant flow path enters from the second end and extends from the first end;

    Alternatively, the first refrigerant flow path enters from the second end and protrudes from the first end, and the second refrigerant flow path enters from the first end and protrudes from the second end.

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