CN113432214A

CN113432214A - Air conditioning system, machine room air conditioning system and air conditioning control method

Info

Publication number: CN113432214A
Application number: CN202110615630.XA
Authority: CN
Inventors: 李伟瀚; 张时翼
Original assignee: Guangdong Youdian New Energy Technology Co ltd
Current assignee: Guangdong Youdian New Energy Technology Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2021-09-24

Abstract

The application relates to the technical field of air conditioners and discloses an air conditioning system, a machine room air conditioning system and an air conditioning control method. The air conditioning system comprises a first heat exchanger, a second heat exchanger and a compressor, wherein the first heat exchanger, the second heat exchanger and the compressor are sequentially communicated through pipelines to form refrigerant circulation; the third connecting port is connected with the first connecting port in a bypassing manner, and the fourth connecting port is connected with the air suction pipe and the exhaust pipe of the compressor through the selective valve. Compared with the prior art, the fourth connecting port is connected with the exhaust pipe of the compressor through the selective valve, so that the second heat exchanging part and the second heat exchanger exchange heat with the refrigerant together, the fourth connecting port and the air suction pipe of the compressor are connected through the selective valve, so that the second heat exchanging part and the first heat exchanging part participate in heat exchange together, heat supplement is carried out, heat exchange efficiency is improved, and cost is reduced.

Description

Air conditioning system, machine room air conditioning system and air conditioning control method

Technical Field

The application relates to the technical field of air conditioners, in particular to an air conditioning system, a machine room air conditioning system and an air conditioning control method.

Background

With the improvement of living standard of people, the regulation demand of air temperature and humidity is getting bigger and bigger, for example, the demand of data computer room on air temperature and humidity is higher, the fluctuation of temperature or humidity may cause some problems, for example, messy codes appear during processing, even the system is completely shut down when serious, causing huge economic loss. However, under some working conditions, especially under low thermal load and high humidity, the temperature of the machine room is also reduced while the humidity in the machine room is controlled by the conventional air conditioner, and temperature and humidity fluctuation is large in severe cases to cause server failure, and the service life of an air conditioner compressor is also reduced due to frequent start and stop; in the humid and shady season in the south, people need moderate ambient temperature when dehumidifying, and the ambient temperature is not lower than the ambient temperature. The method for solving the problem at present is to arrange a variable frequency compressor and an auxiliary electric heating device in the air conditioner, and reduce the frequency by the variable frequency compressor and start the auxiliary electric heating device to perform heat compensation so as to ensure that the temperature in the dehumidification process is not lower than the lower limit of a temperature set value, and the method has defects, such as large power consumption and high cost of the auxiliary electric heating device; the compressor needs low frequency to dehumidify under high humidity condition, which results in slow dehumidifying speed.

Disclosure of Invention

In order to solve the technical problems of low dehumidification efficiency, high cost and high power consumption, the main objective of the application is to provide an air conditioning system, a machine room air conditioning system and an air conditioning control method, wherein the air conditioning system, the machine room air conditioning system and the air conditioning control method can achieve high dehumidification efficiency, low cost and low power consumption.

In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:

according to one aspect of the present application, an air conditioning system is provided, which includes a first heat exchanger, a second heat exchanger, and a compressor, which are sequentially connected by a pipeline to form a refrigerant cycle, wherein the first heat exchanger includes a first heat exchanging portion and a second heat exchanging portion, the first heat exchanging portion includes a first connection port and a second connection port, and the second heat exchanging portion includes a third connection port and a fourth connection port; the third connecting port is connected to the first connecting port in a bypassing manner, and the fourth connecting port is connected with the air suction pipe and the exhaust pipe of the compressor through the gate valve.

According to an embodiment of the present application, the fourth connection port is connected to the air suction pipe of the compressor through the gate valve, and the fourth connection port is a refrigerant outlet of the second heat exchanging portion; alternatively, the first and second electrodes may be,

and the fourth connecting port is communicated with an exhaust pipe of the compressor through the selector valve, and the fourth connecting port is a refrigerant inlet of the second heat exchanging part.

According to an embodiment of the present application, the connection between the selective valve and the suction pipe of the compressor is a first branch, and the connection between the selective valve and the discharge pipe of the compressor comprises a second branch; the selective valve is switched between the first branch and the second branch.

According to an embodiment of the present application, the heat exchanger further includes a first throttle and a second throttle, the first throttle is disposed between the first connection port and the third connection port, and the second throttle is disposed between the first connection port and the discharge port of the second heat exchanger.

According to an embodiment of the application, the connection point of the outside of the third port to the first port line is located on the line between the first orifice and the first connection port.

According to an embodiment of the present application, the first heat exchanging portion and the second heat exchanging portion share an airflow channel, the second heat exchanging portion is located on an upstream side of the airflow channel of the first heat exchanging portion, and a fan for driving the airflow to flow is provided in the airflow channel.

According to another aspect of the present application, there is provided a machine room air conditioning system including the air conditioning system.

According to an embodiment of the present application, the air conditioner comprises a dehumidification mode and a refrigeration mode, wherein the selector valve is connected to an air suction pipe of the compressor through a first branch and connected to an air discharge pipe of the compressor through a second branch;

in the cooling mode, the first branch is communicated with the fourth connecting port;

in the dehumidification mode, the second branch is connected to the fourth connection port.

According to an embodiment of the application, still include environmental sensor and controller, environmental sensor detects the environmental parameter in the target space, environmental sensor signal connection in the controller, the controller is according to the environmental parameter switches the operation dehumidification mode or the refrigeration mode.

According to an aspect of the present application, there is provided an air conditioning control method including the air conditioning system, including the steps of:

acquiring an operation mode signal;

when the mode signal is the first mode signal, outputting a first connection state signal of the selective valve, and simultaneously sending a compressor starting signal;

the fourth connecting port is connected with an exhaust pipe of the compressor through the gate valve according to the first connecting state signal through the gate valve;

the compressor starts to operate according to the starting signal, the second heat exchange part operates in a condenser mode to release heat, and heat compensation in a dehumidification mode is carried out on the first heat exchange part;

when the mode signal is the second mode signal, outputting a second connection state signal of the selective valve, and simultaneously sending a compressor starting signal;

the selective valve enables the fourth connecting port to be connected with the air suction pipe of the compressor through the selective valve according to the second connection state signal;

the compressor starts to operate according to the starting signal, and the second heat exchange part operates in an evaporator mode to absorb heat to realize refrigeration.

According to the technical scheme, the air conditioning system, the machine room air conditioning system and the air conditioning control method have the advantages and positive effects that:

the selective valve can control the fourth interface to be connected with an exhaust pipe of the compressor, the second heat exchanging part and the second heat exchanger can exchange heat with a refrigerant together, so that the heat exchange efficiency is improved, meanwhile, the second heat exchanging part is accompanied with a heat releasing process in the heat exchange process so as to perform heat compensation on the first heat exchanging part and the space to be heated, an additional electric heating device is not required to be added for performing heat compensation, and the cost is reduced; meanwhile, when the selector valve enables the fourth connecting port to be connected with the air suction pipe of the compressor, the second heat exchanging part and the first heat exchanging part participate in heat exchange together to exchange heat for the refrigerant discharged by the second heat exchanger, and therefore heat exchange efficiency is further improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic connection structure diagram of an air conditioning system according to an embodiment of the present disclosure;

fig. 2 is a schematic view of another connection structure of an air conditioning system according to an embodiment of the present disclosure;

fig. 3 is a schematic view of another connection structure of an air conditioning system according to an embodiment of the present disclosure;

fig. 4 is a schematic view of another connection structure of an air conditioning system according to an embodiment of the present disclosure.

Wherein:

100. a first heat exchanger; 1. a first heat exchanging portion; 2. a second heat exchanging portion; 101. a first connection port; 102. a second connection port; 200. a second heat exchanger; 201. a third connection port; 202. a fourth connection port; 300. a compressor; 400. a gate valve; a. a third port; b. a first port; c. a second port; 3. a first orifice member; 4. a second orifice member; 5. a first branch; 6. a second branch circuit; 7. a fan.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

In the use process of the air conditioner, the temperature and the humidity of the air in the indoor space need to be adjusted through the compressor 300, the evaporator and the condenser, and along with the improvement of the application environment requirements, higher requirements are provided for the humidity adjusting and temperature adjusting functions of the air conditioner. Particularly, when the air conditioner is used for humidity adjustment, due to the influence of the compressor 300 and the condenser, the process of adjusting the indoor humidity through the evaporator is accompanied with the reduction of the indoor temperature, the higher the power of the compressor 300 is, the higher the humidity adjustment efficiency is, the more obvious the effect of reducing the indoor temperature is, and for the environment with high requirements such as a data machine room, the fluctuation of the temperature or the humidity may cause some problems, for example, messy codes appear during processing, and even the system is completely shut down in severe cases, so that huge economic loss is caused; or when the air is humid and cool in the south, the indoor temperature needs to be kept stable in the dehumidification process, and sometimes even the indoor environment needs to be heated. The existing method for solving the problem is to arrange a variable frequency compressor 300 and an auxiliary electric heating device in the air conditioner, and reduce the frequency of the variable frequency compressor 300 and start the auxiliary electric heating device to perform heat compensation so as to ensure that the temperature in the dehumidification process is not lower than the lower limit of a temperature set value, and the method has defects, such as large power consumption and high cost of the auxiliary electric heating device; the compressor 300 requires low frequency for dehumidification under high humidity conditions, which results in a problem of slow dehumidification speed.

In order to solve the technical problems of low dehumidification efficiency, high cost and high power consumption, the application provides an air conditioning system, which comprises a first heat exchanger 100, a second heat exchanger 200 and a compressor 300, wherein pipelines are sequentially communicated to form refrigerant circulation, the first heat exchanger 100 comprises a first heat exchanging part 11 and a second heat exchanging part 22, the first heat exchanging part 11 comprises a first connecting port 101 and a second connecting port 102, and the second heat exchanging part 22 comprises a third connecting port 201 and a fourth connecting port 202; the third connection port 201 is connected to the first connection port 101, and the fourth connection port 202 is connected to the intake pipe and the exhaust pipe of the compressor 300 through the gate valve 400.

It should be understood that the selective valve 400 can control the fourth connection port 202 to be connected to the exhaust pipe of the compressor 300, the second heat exchanging portion 22 can exchange heat with the second heat exchanger 200 to further improve heat exchange efficiency, and meanwhile, since the second heat exchanging portion 22 is accompanied by a heat releasing process in the heat exchanging process to perform heat compensation on the first heat exchanging portion 1 and the space to be heat exchanged, an additional electric heating device is not required to be added for heat compensation, so that the cost is reduced; meanwhile, when the selective valve 400 connects the fourth connection port 202 to the air suction pipe of the compressor 300, the second heat exchanging portion 22 and the first heat exchanging portion 11 participate in heat exchange together, so as to exchange heat with the refrigerant discharged from the second heat exchanger 200, thereby further improving heat exchange efficiency.

Referring to fig. 1, which is a schematic view of a connection structure of an air conditioning system provided in an embodiment of the present application, and fig. 2 is a schematic view of another connection structure of an air conditioning system provided in an embodiment of the present application, as an example, the second heat exchanger 200 may be configured as a condenser, the first heat exchanger 100 may be configured as an evaporator group, the first heat exchanging portion 11 may be configured as a main evaporator, the second heat exchanging portion 22 is configured as a secondary evaporator, and the main evaporator and the secondary evaporator may participate in a refrigerant heat exchange process independently from each other.

Preferably, an inlet pipe of the second heat exchanger 200 is connected to an exhaust pipe of the compressor 300, and an outlet of the second heat exchanger 200 is connected to the first connection port 101, so that a refrigerant is introduced into the first heat exchanging part 11 or the second heat exchanging part 22 through the first connection port 101.

That is, the condenser exchanges heat with the refrigerant compressed by the compressor 300, the condensed refrigerant is guided to the first connection port 101 of the main evaporator through the discharge port of the condenser, and the heat exchange is performed separately by the main evaporator;

or the refrigerant is guided into the third connection port 201 through the bypass pipeline, that is, the refrigerant is guided into the second heat exchange portion 22, so that the refrigerant treated by the condenser is subjected to heat exchange through the primary evaporator and the secondary evaporator together.

The first heat exchanging part 11, that is, the second connection port 102 of the main evaporator, is connected to the air intake pipe of the compressor 300 as the discharge port of the main evaporator, and guides the refrigerant, which exchanges heat with the air in the space to be conditioned, into the compressor 300 through the discharge port of the main evaporator, to participate in a new heat exchange cycle.

When the selective valve 400 connects the fourth connection port 202 to the exhaust pipe of the compressor 300, the condenser exchanges heat with the refrigerant compressed by the compressor 300, the condensed refrigerant is guided to the first connection port 101 of the main evaporator through the discharge port of the condenser, and the refrigerant processed by the condenser exchanges heat with the main evaporator;

meanwhile, the secondary evaporator exchanges heat with the refrigerant discharged from the compressor 300, the refrigerant subjected to heat exchange processing by the secondary evaporator is guided into the first connection port 101 through the third connection port 201, and then the refrigerant subjected to heat exchange processing by the secondary evaporator is subjected to heat exchange through the primary evaporator, and at this time, the processing of the refrigerant by the secondary evaporator is equivalent to the effect of the condenser, in other words, the secondary evaporator and the condenser exchange heat with the refrigerant discharged from the compressor 300 together, so that the heat exchange effect of the condenser is improved through the second heat exchange portion 2, and the refrigerant subjected to heat exchange processing by the secondary evaporator and the condenser is guided into the primary evaporator through the first connection port 101, and then the indoor air is adjusted.

And the secondary evaporator is used for regulating indoor air by released heat in the heat exchange process, so that the energy consumption is saved, the use cost of equipment is reduced, the heat exchange efficiency is improved, and the indoor temperature is kept balanced in the heat exchange process so as to adapt to different use environments.

The selector valve 400 may connect the fourth connection port 202 with the intake pipe of the compressor 300, so that the condenser is connected between the exhaust pipe of the compressor 300 and the first connection port 101, and the third connection port 201 is connected to the first connection port 101, so that the main evaporator and the secondary evaporator participate in heat exchange of the refrigerant discharged from the second heat exchanger 200 together, that is, the secondary evaporator performs a process on the refrigerant equivalent to the main evaporator, thereby improving the heat exchange efficiency of the main evaporator, and further improving the overall heat exchange efficiency.

As an example, the selective valve 400 may be configured as a three-way valve, and a first port, a second port and a third port of the three-way valve are respectively connected to the exhaust pipe of the compressor 300, the intake pipe of the compressor 300 and the fourth connection port 202.

Referring to fig. 3, another schematic connection structure diagram of an air conditioning system provided in the embodiment of the present application, and fig. 4 is another schematic connection structure diagram of an air conditioning system provided in the embodiment of the present application, the selective valve 400 may further be configured as two electromagnetic valves, such that one end of each electromagnetic valve is connected to the fourth connection port 202, and the other end of each electromagnetic valve is connected to the discharge pipe of the compressor 300 or the intake pipe of the compressor 300, both the purpose of connecting the fourth connection port 202 to the suction pipe and the discharge pipe of the compressor 300 through the selective valve 400 can be achieved, and a person skilled in the art can select the type of the selective valve 400 according to actual use conditions.

Preferably, a plurality of second heat exchanging portions 2 may be further provided, and the fourth connection ports 202 of the plurality of second heat exchanging portions 2 are connected to the discharge pipe of the compressor 300 or the suction pipe of the compressor 300 through the gate valve 400, so as to further improve heat exchange efficiency, and a person skilled in the art may set the number of the second heat exchanging portions 2 according to actual use.

According to an embodiment of the present invention, the fourth connection port 202 is connected to the suction pipe of the compressor 300 through the gate valve 400, and the fourth connection port 202 is a refrigerant outlet of the second heat exchanging part 2; alternatively, the first and second electrodes may be,

the fourth connection port 202 is connected to the discharge pipe of the compressor 300 through the gate valve 400, and the fourth connection port 202 is a refrigerant inlet of the second heat exchanging part 2.

It should be understood that, when the fourth connection port 202 is connected to the suction pipe of the compressor 300 through the selective valve 400, and the fourth connection port 202 is a refrigerant outlet of the second heat exchanging portion 2, the refrigerant compressed by the compressor 300 is introduced into the second heat exchanger 200 through a pipeline, and after heat exchange of the refrigerant by the second heat exchanger 200, the refrigerant is introduced into the first heat exchanging portion 1 and the second heat exchanging portion 2 through the first connection port 101 and the third connection port 201, that is, the first heat exchanging portion 1 and the second heat exchanging portion 2 participate in heat exchange of the refrigerant discharged by the second heat exchanger 200 together.

After the conditioned air is subjected to heat exchange, the second connection port 102 is connected to the air suction pipe of the compressor 300, so that the refrigerant subjected to the heat exchange treatment by the first heat exchange portion 1 is introduced into the compressor 300 through the air suction pipe to participate in a new heat exchange cycle;

meanwhile, the selector valve 400 connects the fourth connection port 202 with the air suction pipe of the compressor 300, so that the refrigerant subjected to heat exchange treatment by the second heat exchanging portion 2 is introduced into the compression through the air suction pipe, participates in the heat exchange cycle of the second round, and further increases the heat exchange efficiency of the first heat exchanging portion 1 through the second heat exchanging portion 2.

And when the fourth connection port 202 is connected to the discharge pipe of the compressor 300 through the gate valve 400, when the fourth connection port 202 is a refrigerant inlet of the second heat exchanging part 2, a portion of the refrigerant compressed by the compressor 300 is introduced into the second heat exchanger 200 through a pipeline, and the other portion is connected to the fourth connection port 202 through the gate valve 400, and then the refrigerant compressed by the compressor 300 is introduced into the second heat exchanging part 2, the refrigerant heat-exchanged by the second heat exchanger 200 is introduced into the first heat exchanging part 1 through the first connection port 101, the refrigerant after heat exchange in the second heat exchanging part 2 is introduced into the first heat exchanging part 1 through the first connection port 101 connected by the third connection port 201, and the heat exchange efficiency of the second heat exchanger 200 is improved by the second heat exchange part 2.

After the first heat exchanging part 1 exchanges heat with the conditioning air, a refrigerant is introduced into the compressor 300 through the second connection port 102 to participate in the heat exchange cycle of the second cycle.

Preferably, a control device may be provided, and the control device controls the selective valve 400 to control the selective valve 400 to connect the fourth connection port 202 to the discharge pipe of the compressor 300 or to the suction pipe of the compressor 300.

According to an embodiment of the present application, the connection between the selective valve 400 and the suction pipe of the compressor 300 is made by a first branch 5, and the connection between the selective valve 400 and the discharge pipe of the compressor 300 comprises a second branch 6; the gate valve 400 switches between the first branch 5 and the second branch 6.

For example, the suction pipe of the compressor 300 and the fourth connection port 202 are connected to each other by the first branch passage 5, and at this time, the refrigerant heat-exchanged by the first heat exchanging portion 1 and the refrigerant heat-exchanged by the second heat exchanging portion 2 are introduced into the suction pipe of the compressor 300 through the first branch passage 5 to be merged;

the exhaust pipe of the compressor 300 and the fourth connection port 202 are communicated through the second branch 6, and at this time, the refrigerant compressed by the compressor 300 is respectively introduced into the second heat exchanging part 2 and the second heat exchanger 200 for heat exchange, so that the port of the selective valve 400 is convenient to switch and gate between the first branch 5 and the second branch 6, and the air to be conditioned is convenient to perform heat exchange in different modes.

Preferably, the selective valve 400 may be a three-way valve, or a solenoid valve is respectively disposed on the first branch 5 and the second branch 6, and the flux of the refrigerant passing through the first branch 5 and the second branch 6 is adjusted through the selective valve 400, so as to improve convenience in use and improve accuracy of adjusting temperature and humidity of air to be conditioned.

For example, after the selective valve 400 connects the fourth connection port 202 with the exhaust pipe of the compressor 300, the first throttling element 3 may guide the refrigerant subjected to heat exchange by the second heat exchanging part 2 into the first heat exchanging part 1, and then control the refrigerant subjected to heat exchange by the second heat exchanging part 2 through the first throttling element 3, so as to adjust the heat exchange enhancing effect of the second heat exchanging part 2 with respect to the second heat exchanger 200.

Preferably, when the air to be conditioned has a small heat load and a large humidity, the selector valve 400 may be set as an electric three-way valve, as shown in fig. 1, a third port a and a first port b of the three-way valve are in channel communication, and a second port c of the three-way valve is closed, preferably, the second heat exchanger 200 may be set as a condenser, the first heat exchanging part 1 is a main evaporator, the second heat exchanging part 2 is a secondary evaporator, and the heat exchanging effect of the second heat exchanger 200 is enhanced by the second heat exchanging part 2, that is, the heat exchanging effect of the condenser is enhanced by the secondary evaporator.

Further, the refrigerant is compressed by the compressor 300 to become a high-temperature high-pressure gaseous refrigerant, one part of the high-temperature high-pressure gaseous refrigerant enters the condenser through the exhaust pipe of the compressor 300, the other part of the high-temperature high-pressure gaseous refrigerant enters the secondary evaporator through the exhaust pipe of the compressor 300 through the electric three-way valve, and the high-temperature high-pressure gaseous refrigerant is condensed in the condenser and the secondary evaporator respectively to become a high-pressure liquid refrigerant;

that is, the function of secondary evaporator is equivalent to the condenser, and the refrigerant is in the inside phase transition of secondary evaporator is exothermic, exothermic heat with treat the air heat transfer, and then pass through secondary evaporator treats that the air conditioned carries out the thermal compensation, reduces the energy consumption, and is improving dehumidification effect, right treat the air conditioned heat, avoid because the problem of the temperature reduction that the dehumidification process leads to.

The high-pressure liquid refrigerant of the third connecting port 201 of the secondary evaporator is throttled, cooled and depressurized by the first throttling element 3, then is merged with the low-temperature and low-pressure liquid refrigerant throttled, cooled and depressurized by the second throttling element 4, enters the primary evaporator through the first connecting port 101, and is used for cooling and dehumidifying indoor high-humidity air, and the low-humidity and low-temperature air of the second connecting port 102 of the primary evaporator is heated by the heat released by the secondary evaporator, so that the temperature of the air to be regulated can be controlled at a set value, and the humidity of the air to be regulated is reduced to achieve a constant temperature and humidity regulating effect; the low-temperature gaseous refrigerant after heat exchange at the second connection port 102 of the main evaporator enters the compressor 300 through the air suction pipe of the compressor 300, and is subjected to second-round compression dehumidification.

As an example, the first throttling element 3 and the second throttling element 4 may be provided as electromagnetic valves, and the opening degree of the electromagnetic valves is controlled to control the flux of the refrigerant introduced into the first heat exchanging part 1 by the second heat exchanging part 2 and the second heat exchanger 200, so as to adjust the heat exchanging efficiency of the whole system and improve the precision in the heat exchanging regulation process.

As an example, the first throttling element 3 may adjust the opening degree according to the temperature control deviation, the second throttling element 4 may adjust the opening degree according to the suction superheat degree, and one skilled in the art may adjust the opening degrees of the first throttling element 3 and the second throttling element 4 according to the actual use condition.

As an example, when the selector valve 400 is made to connect the fourth connection port 202 to the suction pipe of the compressor 300, and the third port a and the second port c of the three-way valve are preferably made to connect as shown in fig. 2, the first port b is closed and the first throttle 3 is fully opened;

the refrigerant is compressed by the compressor 300 to become a high-temperature high-pressure gaseous refrigerant, and the high-temperature high-pressure gaseous refrigerant enters the condenser through the exhaust pipe of the compressor 300, after the condenser dissipates heat and cools, the refrigerant changes phase into a high-temperature high-pressure liquid refrigerant after heat exchange, and flows to the second throttling element 4;

the second throttling element 4 adjusts the opening degree through the suction superheat degree, throttles, cools and reduces the pressure of the high-temperature and high-pressure liquid refrigerant, after the low-temperature and low-pressure liquid refrigerant is formed, one part of the low-temperature and low-pressure liquid refrigerant directly enters the main evaporator, the other part of the low-temperature and low-pressure liquid refrigerant enters the secondary evaporator through the first throttling element 3, the air to be adjusted is absorbed by the main evaporator and the secondary evaporator together to be cooled, the refrigeration purpose is achieved, the liquid refrigerants in the main evaporator and the secondary evaporator absorb heat and are changed into gas, the gas is converged into the air suction pipe of the compressor 300, and the gas enters the second round of compression refrigeration.

Preferably, the opening degree of the first throttling element 3 can be adjusted to adjust the heat exchange efficiency of the refrigerant after the heat exchange of the second heat exchanging part 2 to the condenser, so as to adjust the refrigeration efficiency of the whole system.

In order to improve the refrigeration efficiency, the first throttling element 3 may be fully opened, so that the refrigerant after heat exchange of the condenser is introduced into the second heat exchanging portion 2 for heat exchange, thereby improving the refrigeration efficiency of the whole system, and a person skilled in the art may adjust the opening degree of the first throttling element 3 and the second throttling element 4 according to actual use requirements.

In the refrigeration mode, the fan 7 and the compressor 300 control the rotating speed output according to the temperature control deviation, the second throttling element 4 adjusts the opening degree through the suction superheat degree, and the first throttling element 3 is completely opened and does not play a role in adjustment.

According to an embodiment of the present application, a connection point of the third connection port 201 with the first connection port 101 is located on the pipeline between the first throttling element 3 and the first connection port 101.

As an example, after the high-pressure liquid refrigerant of the third connection port 201 of the secondary evaporator is throttled, cooled and depressurized by the first throttling element 3, the refrigerant releases heat and changes phase into a liquid refrigerant, and is simultaneously merged with the low-temperature and low-pressure liquid refrigerant throttled, cooled and depressurized by the second throttling element 4, so that the second throttling element 4 is prevented from throttling, cooling and depressurizing the liquid refrigerant discharged from the third connection port 201 of the secondary evaporator again, the throttling, depressurizing and cooling effect of the second throttling element 4 on the heat exchange refrigerant of the condenser is influenced, the flow of the liquid refrigerant is further improved, and the dehumidification effect of the main evaporator on the air to be adjusted is further improved.

According to an embodiment of the present invention, the first heat exchanging part 1 and the second heat exchanging part 2 share an air flow passage, the second heat exchanging part 2 is located at an upstream side of the air flow passage of the first heat exchanging part 1, and a fan 7 for driving air to flow is provided in the air flow passage.

As an example, the fan may be disposed in the second heat exchanging portion 2, and when the selective valve 400 connects the fourth connection port 202 with the exhaust pipe of the compressor 300, the fan 7 may improve the heat releasing efficiency of the second heat exchanging portion 2 after heat exchange, so as to quickly compensate the heat of the air to be conditioned, avoid the temperature from being too low, and reduce the temperature change of the air to be conditioned. Preferably, the fan and the compressor 300 may control the rotation speed of the fan and the exhaust speed of the compressor 300 according to a humidity deviation in the air to be conditioned.

When the selective valve 400 connects the fourth connection port 202 with the air suction pipe of the compressor 300, the cooling efficiency of the first heat exchanging part 1 and the second heat exchanging part 2 may be increased by the fan 7, so as to improve the cooling effect of the air to be conditioned.

According to one aspect of the application, a machine room air conditioning system is provided, comprising the air conditioning system.

According to an embodiment of the present application, including a dehumidification mode and a refrigeration mode, the gate valve 400 is connected to the suction pipe of the compressor 300 through the first branch 5, and is connected to the discharge pipe of the compressor 300 through the second branch 6;

in the cooling mode, the first branch passage 5 is connected to the fourth connection port 202;

in the dehumidification mode, the second branch 6 is connected to the fourth connection port 202.

Preferably, the selective valve 400 includes two solenoid valves, and the two solenoid valves are respectively disposed in the first branch 5 and the second branch 6. Referring to fig. 3 and 4, the first branch 5 and the second branch 6 can be independently switched and controlled, so as to adjust the system to be in the dehumidification mode or the refrigeration mode, thereby improving convenience in use.

Preferably, the controller is connected to the option valve 400 to operate the dehumidification mode or the cooling mode by switching the option valve 400.

acquiring an operation mode signal;

when the first mode signal is obtained, outputting a first on-state signal of the gate valve 400, and simultaneously sending a starting signal of the compressor 300;

the selective valve 400 connects the fourth connection port 202 to the exhaust pipe of the compressor 300 through the selective valve 400 according to the first connection state signal;

the compressor 300 starts to operate according to a start signal, the second heat exchanging part 2 operates in a condenser mode to release heat, and heat compensation in a dehumidification mode is performed to the first heat exchanging part 1;

when the second mode signal is obtained, outputting a second on-state signal of the gate valve 400, and simultaneously sending a starting signal of the compressor 300;

the selective valve 400 connects the fourth connection port 202 to the suction pipe of the compressor 300 through the selective valve 400 according to the second connection state signal;

the compressor 300 starts to operate according to the start signal, and the second heat exchanging part 2 operates in an evaporator mode to absorb heat to perform cooling.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning system comprises a first heat exchanger (100), a second heat exchanger (200) and a compressor (300), wherein the first heat exchanger (100) comprises a first heat exchanging part (1) and a second heat exchanging part (2), the first heat exchanging part comprises a first connecting port (101) and a second connecting port (102), and the second heat exchanging part (2) comprises a third connecting port (201) and a fourth connecting port (202); the third connecting port (201) is connected to the first connecting port (101) in a bypassing manner, and the fourth connecting port (202) is connected with the air suction pipe and the air exhaust pipe of the compressor (300) through the selective valve (400).

2. The air conditioning system of claim 1,

the fourth connecting port (202) is communicated with the air suction pipe of the compressor through the selective valve (400), and the fourth connecting port (202) is a refrigerant outlet of the second heat exchanging part (2); alternatively, the first and second electrodes may be,

the fourth connecting port (202) is communicated with an exhaust pipe of the compressor through the selective valve (400), and the fourth connecting port (202) is a refrigerant inlet of the second heat exchanging part (2).

3. Air conditioning system according to claim 1, wherein the connection between the selective valve (400) and the suction pipe of the compressor is made by a first branch (5), and the connection between the selective valve (400) and the discharge pipe of the compressor is made by a second branch (6); the selector valve (400) is switched between the first branch (5) and the second branch (6).

4. An air conditioning system according to claim 3, characterized by comprising a first throttle member (3) and a second throttle member (4), the first throttle member (3) being arranged between the first connection port (101) and the third connection port (201), the second throttle member (4) being arranged between the first connection port (101) and the discharge port of the second heat exchanger.

5. An air-conditioning system according to claim 4, characterized in that the connection point outside the third connection port (201) to the line of the first connection port (101) is located on the line between the first throttle element (3) and the first connection port (101).

6. The air conditioning system according to any one of claims 1 to 5, wherein the first heat exchanging portion (1) and the second heat exchanging portion (2) share an air flow passage, the second heat exchanging portion (2) is located on an upstream side of the air flow passage of the first heat exchanging portion (1), and a fan (7) for circulating a driving air is provided in the air flow passage.

7. A machine room air conditioning system characterized by comprising the air conditioning system of any one of claims 1 to 6.

8. The air conditioning system of the machine room of claim 7, comprising a dehumidification mode and a refrigeration mode, wherein the selector valve is connected to the suction pipe of the compressor through a first branch and to the discharge pipe of the compressor through a second branch;

9. The machine room air conditioning system of claim 8, further comprising an environmental sensor that detects an environmental parameter in a target space and a controller in signal connection with the controller that switches operation of the dehumidification mode or the cooling mode according to the environmental parameter.

10. An air conditioning control method characterized by comprising the air conditioning system according to any one of claims 1 to 6, comprising the steps of:

acquiring an operation mode signal;

when the mode signal is the first mode signal, outputting a first connection state signal of the selective valve (400), and simultaneously sending out a compressor starting signal;

the selective valve (400) enables the fourth connecting port (202) to be connected with an exhaust pipe of the compressor through the selective valve (400) according to the first connection state signal;

the compressor (300) starts to operate according to a starting signal, the second heat exchanging part (2) operates in a condenser mode to release heat, and heat compensation in a dehumidification mode is performed on the first heat exchanging part (1);

when the mode signal is the second mode signal, outputting a second connection state signal of the selective valve (400) and simultaneously sending a compressor starting signal;

the selective valve (400) enables the fourth connecting port (202) to be connected with the air suction pipe of the compressor through the selective valve (400) according to the second connection state signal;

the compressor (300) starts to operate according to the starting signal, and the second heat exchanging part (2) operates in an evaporator mode to absorb heat to realize refrigeration.