CN214250189U

CN214250189U - Air conditioning system

Info

Publication number: CN214250189U
Application number: CN202023087961.0U
Authority: CN
Inventors: 王芳; 倪毅; 薛寒冬; 余凯; 傅英胜; 李龙飞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-09-21
Anticipated expiration: 2030-12-18

Abstract

The present disclosure provides an air conditioning system, comprising: at least two compressors and a four-way valve; at least two compressors are arranged in parallel, and at least one of the at least two compressors is a variable-frequency variable-capacity compressor; the four-way valve is provided with a D port and an S port; the variable volume mouth of frequency conversion variable volume compressor is linked together through the D mouth of first solenoid valve with the cross valve, and the variable volume mouth of frequency conversion variable volume compressor still is linked together through the S mouth of second solenoid valve with the cross valve. The air conditioning system with the two parallel compressors can reduce the lowest operation frequency of the compressors, improve the low-load energy efficiency of the compressors, and simultaneously avoid the indoor sudden cooling and sudden heating condition caused by frequent startup and shutdown due to overlarge low-load output, so that the unit can operate at the frequency with higher energy efficiency ratio as much as possible, the power of the compressors is reduced, and the electric quantity is saved. In addition, the maximum running frequency of the compressor is reduced, the high-frequency running noise of the compressor is greatly reduced, the use experience of a user is enhanced, and the indoor comfort is improved.

Description

Air conditioning system

Technical Field

The disclosure belongs to the technical field of air conditioning, and particularly relates to an air conditioning system.

Background

Along with the development of economy and the improvement of the living standard of people, people have higher and higher requirements on indoor comfort, and more air conditioning equipment enter the daily life of people. One of them is home multi-online. Because the multi-split air conditioner is formed by matching one indoor unit with a plurality of indoor units, the indoor units can be opened from single to full, so that the operating frequency range of the compressor of the air conditioner is required to be wide enough, the load provided by the compressor is as low as possible when the compressor operates at the minimum operating frequency, and the load provided by the compressor is as large as possible when the compressor operates at the maximum operating frequency.

While the related art multi-connected air conditioning system employs a rotary compressor, noise and vibration problems of the rotary compressor cause the maximum operating frequency of the compressor not to be too low, and the maximum operating frequency not to be too high at the same time. The compressor can not run at low frequency, so that the phenomenon of frequent start and stop caused by large minimum output load when the system runs at low load is caused, the reliability of the compressor is also reduced while the electric energy is wasted. The maximum operating frequency of the compressor affects the maximum capacity output of the compressor, and has a great influence on the cooling and heating speed and the effect under high load of the system.

Disclosure of Invention

Therefore, the technical problem to be solved by the present disclosure is that the operating frequency range of the compressor of the multi-connected air conditioning system is insufficient, so as to provide an air conditioning system.

In order to solve the above problems, the present disclosure provides an air conditioning system including:

at least two compressors and a four-way valve;

at least two compressors are arranged in parallel, and at least one of the at least two compressors is a variable-frequency variable-capacity compressor;

the four-way valve is provided with a D port and an S port;

the variable volume mouth of frequency conversion variable volume compressor is linked together through the D mouth of first solenoid valve with the cross valve, and the variable volume mouth of frequency conversion variable volume compressor still is linked together through the S mouth of second solenoid valve with the cross valve.

The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.

In some embodiments, the outlets of at least two compressors are connected to the D port of the four-way valve.

In some embodiments, an oil separator is provided between the outlets of the at least two compressors and the D port of the four-way valve.

In some embodiments, the oil separator is provided with oil return ports, and the oil return ports are respectively communicated to the inlets of the at least two compressors through oil return capillary tubes.

In some embodiments, the air conditioning system further comprises an outdoor heat exchanger, the four-way valve is provided with a port C, and an inlet of the outdoor heat exchanger is communicated with the port C of the four-way valve.

In some embodiments, an outlet of the outdoor heat exchanger is communicated with a first throttling element, an outlet of the first throttling element is communicated with a subcooler, an outlet of the subcooler is communicated with at least two indoor units, and the at least two indoor units are arranged in parallel.

In some embodiments, the four-way valve is further provided with an E port, and the outlets of at least two indoor units are respectively communicated to the E port of the four-way valve.

In some embodiments, the S port of the four-way valve is further communicated with a gas-liquid separator, and an outlet of the gas-liquid separator is communicated to inlets of the at least two compressors.

In some embodiments, the outlet of the subcooler is communicated with a first valve, the inlets of at least two indoor units are respectively communicated with the first valve, and a second throttling element is arranged between the inlet of each indoor unit and the first valve.

In some embodiments, the port E of the four-way valve is communicated with a second valve, and outlets of at least two indoor units are respectively communicated to the second valve.

In some embodiments, the variable frequency variable capacity compressor includes a single cylinder mode of operation, a dual cylinder mode of operation.

The air conditioning system provided by the present disclosure has at least the following beneficial effects:

the air conditioning system with the two parallel compressors can reduce the lowest operation frequency of the compressors, improve the low-load energy efficiency of the compressors, and simultaneously avoid the indoor sudden cooling and sudden heating condition caused by frequent startup and shutdown due to overlarge low-load output, so that the unit can operate at the frequency with higher energy efficiency ratio as much as possible, the power of the compressors is reduced, and the electric quantity is saved. In addition, the maximum running frequency of the compressor is reduced, the high-frequency running noise of the compressor is greatly reduced, the use experience of a user is enhanced, and the indoor comfort is improved.

Drawings

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

fig. 2 is a control flowchart of an air conditioning system according to an embodiment of the present disclosure.

The reference numerals are represented as:

1. a compressor; 2. a variable frequency variable capacity compressor; 3. a four-way valve; 4. a variable volume port; 5. an oil separator; 6. an outdoor heat exchanger; 7. a subcooler; 8. an indoor unit; 9. a gas-liquid separator; 10. a first valve; 11. a first throttling element; 12. a second throttling element; 13. a second valve; 14. an oil return capillary tube; 15. a first solenoid valve; 16. a second solenoid valve.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

As shown in fig. 1, the present embodiment provides an air conditioning system including: at least two compressors 1 and a four-way valve 3; at least two compressors 1 are arranged in parallel, and at least one of the at least two compressors 1 is a variable-frequency variable-capacitance compressor 2; the four-way valve 3 is provided with a D port and an S port; the variable volume mouth 4 of frequency conversion variable volume compressor 2 is linked together through the D mouth of first solenoid valve with cross valve 3, and the variable volume mouth 4 of frequency conversion variable volume compressor 2 still is linked together through the S mouth of second solenoid valve with cross valve 3.

Compared with a common air conditioning system, the system with the two parallel compressors can reduce the lowest running frequency of the compressors, improve the low-load energy efficiency of the compressors, avoid the indoor sudden cooling and sudden heating condition caused by frequent startup and shutdown due to overlarge low-load output, and improve the indoor comfort.

When the same refrigerating and heating requirements are met, the lowest operation frequency of a single compressor can be reduced, so that the unit can operate at the frequency with higher energy efficiency ratio as much as possible, the power of the compressor is reduced, and the electric quantity is saved. In addition, the maximum running frequency of the compressor is reduced, the noise of the high-frequency running of the compressor is greatly reduced, and the use experience of a user is enhanced.

In some embodiments, the outlets of at least two compressors 1 are respectively communicated to the D port of the four-way valve 3, the at least two compressors 1 are arranged in parallel, the operation modes from a single cylinder to a double cylinder and then to a double compressor can be realized, the operation frequency which can be met by the corresponding air conditioning system is wide enough, and the requirement range from single opening to full opening of the indoor unit is met.

In some embodiments, an oil separator 5 is disposed between the outlet of the at least two compressors 1 and the D port of the four-way valve 3, and the oil separator 5 is provided with oil return ports respectively communicated to the inlets of the at least two compressors 1 through oil return capillary tubes 14. The oil separator 5 can recover the lubricating oil in the exhaust gas of the compressor 1 and convey the lubricating oil back into the compressor 1 through the oil return capillary tube 14, so that the lubricating oil in the compressor 1 is prevented from being worn and damaged due to too low lubricating liquid level.

In some embodiments, the air conditioning system further comprises an outdoor heat exchanger 6, the four-way valve 3 is provided with a port C, an inlet of the outdoor heat exchanger 6 is communicated with the port C of the four-way valve 3, and the outdoor heat exchanger 6 converts the refrigerant from a high-pressure gas state to a high-pressure liquid state.

In some embodiments, an outlet of the outdoor heat exchanger 6 is communicated with a first throttling element 11, an outlet of the first throttling element 11 is communicated with a subcooler 7, an outlet of the subcooler 7 is communicated with at least two indoor units 8, and the at least two indoor units 8 are arranged in parallel. At least two indoor units 8 are arranged in parallel, so that single-switch or full-switch control can be realized, and the function of a multi-split air conditioner is realized.

In some embodiments, the four-way valve 3 is further provided with an E port, outlets of at least two indoor units 8 are respectively communicated to the E port of the four-way valve 3, an S port of the four-way valve 3 is further communicated with a gas-liquid separator 9, and outlets of the gas-liquid separator 9 are communicated to inlets of at least two compressors 1.

In some embodiments, the outlet of the subcooler 7 is communicated with a first valve 10, the inlets of at least two indoor units 8 are respectively communicated with the first valve 10, a second throttling element 12 is arranged between the inlet of each indoor unit 8 and the first valve 10, the E port of the four-way valve 3 is communicated with a second valve 13, and the outlets of at least two indoor units 8 are respectively communicated with the second valve 13.

In some embodiments, the variable frequency variable capacity compressor 2 includes a single cylinder mode of operation, a two cylinder mode of operation.

When only the single compressor 1 is required to operate, the variable frequency variable capacity compressor 2 is started. After the frequency conversion variable volume compressor 2 starts, the single cylinder operation, if the ability demand increases, the compressor operating frequency who corresponds increases, if reach the operating frequency who converts into double-cylinder, then switch frequency conversion variable volume compressor 2 into the double-cylinder operation. If the capacity demand continues to increase, the compressor 1 is started to operate when the compressor operating frequency reaches an operating frequency at which it is necessary to start the compressor 1. Namely, when the requirement of the whole machine capacity is increased: the single cylinder, double cylinders and double compressors are increased step by step.

When the double compressors of the unit run and the capacity requirement is reduced, the running frequency of the compressor corresponding to the capacity requirement is also reduced, when the running frequency of the compressor continues to be reduced after a critical value is reached, the compressor 1 stops running firstly, and the variable-frequency variable-capacity compressor 2 executes double-cylinder running; if the running frequency of the compressor is continuously reduced along with the reduction of the capacity requirement, the variable-frequency variable-capacity compressor 2 is switched from double cylinders to single cylinder running. Namely, when the requirement of the whole machine capacity is reduced: the double compressors-double cylinders-single cylinder are reduced step by step.

With reference to fig. 2, with the control method of the air conditioning system of this embodiment, if the maximum operating frequency of the compressor in the system is set to be 2F, that is, the maximum operating frequency of a single compressor is set to be F1 and F2, specifically, the maximum operating frequency of the variable frequency variable capacity compressor 2 is F1, and the maximum operating frequency of the compressor 1 is F2, where F1 and F2 may be the same or different.

When the controller of the air conditioner is powered on, the controller acquires various operation modes (including refrigeration, heating, dehumidification and the like) of the air conditioner. And calculating the current compressor running frequency f by the controller of the air conditioner according To the obtained outdoor environment temperature To, the total number m of the system indoor units, the number n of the starting indoor units and the indoor environment temperature tn of each starting indoor unit every T time (T can be set randomly and is defaulted To 1 min).

If the working condition (i) is met, namely F is not more than 1/2F 1, after the single-cylinder mode of the variable-frequency variable-volume compressor 2 is started, the first electromagnetic valve 15 is closed, the second electromagnetic valve 16 is opened, and the variable-frequency variable-volume compressor 2 operates in a single cylinder.

If the working condition is still the working condition I after 1min, continuing to keep the single-cylinder operation of the variable-frequency variable-capacity compressor 2; if the working condition is judged to be the second working condition, the first electromagnetic valve 15 is opened, the second electromagnetic valve 16 is closed, and the operation is switched to the double-cylinder operation of the variable-frequency variable-capacity compressor 2; if the working condition (c) is judged by calculation, the first electromagnetic valve 15 is opened, the second electromagnetic valve 16 is closed, the operation is switched to the double-cylinder operation of the variable-frequency variable-capacity compressor 2, and then the compressor 1 is started, and the double compressors operate.

If the working condition II is met, namely 1/2F 1 is larger than F and is not larger than F1, after the single-cylinder mode of the variable-frequency variable-capacity compressor 2 is started, the first electromagnetic valve 15 is opened, the second electromagnetic valve 16 is closed, and the variable-frequency variable-capacity compressor 2 operates in double cylinders.

If the working condition is judged to be the working condition I after 1min, the first electromagnetic valve 15 is closed, the second electromagnetic valve 16 is opened, and the single-cylinder operation of the variable-frequency variable-capacity compressor 2 is switched; if the working condition is judged by calculation, the double-cylinder operation of the variable frequency variable volume compressor 2 is continuously kept; if the working condition (c) is judged by calculation, the first electromagnetic valve 15 is opened, the second electromagnetic valve 16 is closed, the two cylinders of the variable-frequency variable-capacity compressor 2 are switched, then the compressor 1 is started, and the two compressors run.

If the working condition (c) is met, namely F is greater than F1 and less than or equal to (F1+ F2), the single-cylinder mode of the variable-frequency variable-capacity compressor 2 is switched to a double-cylinder mode of the variable-frequency variable-capacity compressor 2 after being started, then the compressor 1 is immediately started to operate, and the variable-frequency variable-capacity compressor 2 and the compressor 1 operate simultaneously.

If 1min later, the working condition is calculated and judged to be firstly, the compressor 1 is stopped, and the variable-frequency variable-capacity compressor 2 is switched to single-cylinder operation; if the working condition is judged by calculation, the compressor 1 is stopped, and the variable-frequency variable-capacity compressor 2 operates in double cylinders; and if the working condition (c) is judged by calculation, continuing the operation of the double compressors.

The air conditioning system of the embodiment can meet the requirement that the unit operates at the frequency with higher energy efficiency ratio as much as possible, reduce the power of the compressor and save the electric quantity. In addition, the maximum running frequency of the compressor is reduced, the noise of the high-frequency running of the compressor is greatly reduced, and the use experience of a user is enhanced

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.

Claims

1. An air conditioning system, comprising:

at least two compressors (1) and a four-way valve (3);

the at least two compressors (1) are arranged in parallel, and at least one of the at least two compressors (1) is a variable-frequency variable-capacity compressor (2);

the four-way valve (3) is provided with a D port and an S port;

the variable-capacity port (4) of the variable-frequency variable-capacity compressor (2) is communicated with the D port of the four-way valve (3) through a first electromagnetic valve (15), and the variable-capacity port (4) of the variable-frequency variable-capacity compressor (2) is also communicated with the S port of the four-way valve (3) through a second electromagnetic valve (16).

2. Air conditioning system according to claim 1, characterized in that the outlets of the at least two compressors (1) are connected to the D port of the four-way valve (3).

3. Air conditioning system according to claim 2, characterized in that an oil separator (5) is provided between the outlet of the at least two compressors (1) and the D port of the four-way valve (3).

4. Air conditioning system according to claim 3, characterized in that the oil separator (5) is provided with oil return openings which are connected to the inlets of the at least two compressors (1) by oil return capillary tubes (14), respectively.

5. The air conditioning system according to claim 1, further comprising an outdoor heat exchanger (6), wherein the four-way valve (3) is provided with a port C, and an inlet of the outdoor heat exchanger (6) is communicated with the port C of the four-way valve (3).

6. The air conditioning system according to claim 5, wherein an outlet of the outdoor heat exchanger (6) is communicated with a first throttling element (11), an outlet of the first throttling element (11) is communicated with a subcooler (7), an outlet of the subcooler (7) is communicated with at least two indoor units (8), and the at least two indoor units (8) are arranged in parallel.

7. Air conditioning system according to claim 6, wherein the four-way valve (3) is further provided with an E port, and outlets of the at least two indoor units (8) are respectively communicated to the E port of the four-way valve (3).

8. The air conditioning system as claimed in claim 7, wherein the S port of the four-way valve (3) is further communicated with a gas-liquid separator (9), and the outlet of the gas-liquid separator (9) is communicated to the inlets of the at least two compressors (1).

9. The air conditioning system as claimed in claim 8, wherein the outlet of the subcooler (7) is communicated with a first valve (10), the inlets of the at least two indoor units (8) are respectively communicated with the first valve (10), and a second throttling element (12) is arranged between the inlet of each indoor unit (8) and the first valve (10).

10. The air conditioning system according to claim 9, wherein the port E of the four-way valve (3) is connected to a second valve (13), and outlets of the at least two indoor units (8) are respectively connected to the second valve (13).

11. Air conditioning system according to any of claims 1 to 10, characterized in that the variable frequency variable capacity compressor (2) comprises a single cylinder mode of operation, a double cylinder mode of operation.