Air conditioning system

Abstract

The present invention discloses an air conditioning system, which includes: a compressor, an indoor heat exchanger and a first outdoor heat exchanger, the compressor includes: a shell, a first-stage compression assembly and a second-stage compression assembly, the first-stage compression assembly is arranged in the shell, the second-stage compression assembly is arranged in the shell, at least one of the first-stage compression assembly and the second-stage compression assembly is constructed as a variable capacity compression assembly, a refrigerant conventional flow path and a refrigerant cooling flow path are arranged between the exhaust port of the first-stage compression assembly and the air intake port of the second-stage compression assembly, and a cooling device for cooling the exhaust of the first-stage compression assembly is arranged on the refrigerant cooling flow path; the indoor heat exchanger and the first outdoor heat exchanger are respectively connected to the compressor. Thus, the air conditioning system can select two operating modes of the refrigerant conventional flow path or the refrigerant cooling flow path according to actual conditions, and in each operating mode, the variable capacity compression assembly can be controlled to operate within the optimal capacity ratio range, thereby improving the performance of the air conditioning system.

Description

Technical Field

[0001] The invention relates to the field of compressors, and in particular to an air-conditioning system. Background Art

[0002] In the related technologies, the two-stage compression jet technology has many performance advantages, but the first-stage exhaust has a large degree of superheat, which is not conducive to improving energy efficiency. If the intermediate cooling technology is superimposed, it has the advantages of better performance and lower exhaust temperature. However, after superimposing the intermediate cooling, the energy efficiency of the two-stage compression part is poor at a fixed capacity ratio. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide an air-conditioning system, which can select two operating modes of a conventional refrigerant flow path or a refrigerant cooling flow path according to actual conditions, and in each operating mode, the variable capacity compression component can be controlled to operate within an optimal capacity ratio range, thereby improving the performance of the air-conditioning system.

[0004] The air-conditioning system according to the present invention comprises: a compressor, an indoor heat exchanger and a first outdoor heat exchanger, the compressor comprises: a shell, a first-stage compression assembly and a second-stage compression assembly, the first-stage compression assembly is arranged in the shell, the second-stage compression assembly is arranged in the shell, at least one group of the first-stage compression assembly and the second-stage compression assembly is constructed as a variable capacity compression assembly, a conventional refrigerant flow path and a refrigerant cooling flow path are arranged between the exhaust port of the first-stage compression assembly and the intake port of the second-stage compression assembly, and a cooling device for cooling the exhaust gas of the first-stage compression assembly is arranged on the refrigerant cooling flow path; the indoor heat exchanger and the first outdoor heat exchanger are respectively connected to the compressor.

[0005] According to the air conditioning system of the present invention, the power consumption of the secondary compression component can be reduced and the exhaust temperature of the secondary compression component can be reduced through the cooperation of the compressor, the indoor heat exchanger and the first outdoor heat exchanger, thereby improving the working performance of the air conditioning system.

[0006] In some examples of the present invention, the air-conditioning system further includes: a switching device, which is arranged between the conventional refrigerant flow path and the refrigerant cooling flow path and is used to switch the refrigerant flow direction, so that the exhaust gas of the first-stage compression component can selectively flow to the intake port of the second-stage compression component through the conventional refrigerant flow path or the refrigerant cooling flow path.

[0007] In some examples of the present invention, the switching device includes a reversing valve.

[0008] In some examples of the present invention, the reversing valve is a three-way reversing valve.

[0009] In some examples of the present invention, the cooling device includes: a second outdoor heat exchanger, and the second outdoor heat exchanger is arranged on the refrigerant cooling flow path.

[0010] In some examples of the present invention, the air conditioning system further includes: an air supply device, which is arranged between the indoor heat exchanger and the first outdoor heat exchanger, and the air supply device has an air supply port connected to the air intake port of the secondary compression component.

[0011] In some examples of the present invention, the air supply device is a gas-liquid separation type air supply device or a heat exchanger type air supply device.

[0012] In some examples of the present invention, the cooling device includes: an air supply device, which is arranged between the indoor heat exchanger and the first outdoor heat exchanger, and the air supply device has an air supply port connected to the suction port of the secondary compression component.

[0013] In some examples of the present invention, the air conditioning system further includes: an oil separator, which is arranged on the refrigerant cooling flow path and located on the upstream side of the air supply device.

[0014] In some examples of the present invention, the cooling device further includes: a second outdoor heat exchanger, which is arranged on the refrigerant cooling flow path and located at the upstream side of the air supply device.

[0015] In some examples of the present invention, the first outdoor heat exchanger and the second outdoor heat exchanger are integrated into one to form an integrated outdoor heat exchanger, and the integrated outdoor heat exchanger includes: a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is configured as the first outdoor heat exchanger, and the second heat exchange flow path is configured as the second outdoor heat exchanger.

[0016] In some examples of the present invention, the first-stage compression assembly includes: a first cylinder; the second-stage compression assembly includes: a second cylinder and a third cylinder; the exhaust port of the first cylinder is constructed as the exhaust port of the first-stage compression assembly, and the intake port of the second cylinder and the intake port of the third cylinder together constitute the intake port of the second-stage compression assembly.

[0017] In some examples of the present invention, the second cylinder is a constant volume cylinder, and the third cylinder is a variable volume cylinder.

[0018] In some examples of the present invention, the first-stage compression assembly includes: a first cylinder and a second cylinder; the second-stage compression assembly includes: a third cylinder; the exhaust port of the first cylinder and the exhaust port of the second cylinder together constitute the exhaust port of the first-stage compression assembly, and the intake port of the third cylinder is constructed as the intake port of the second-stage compression assembly.

[0019] In some examples of the present invention, the first cylinder and the third cylinder are both constant volume cylinders, and the second cylinder is a variable volume cylinder.

[0020] In some examples of the present invention, the variable capacity compression assembly includes: a variable capacity cylinder, the variable capacity cylinder is connected to a bypass port, and the compressor further includes: a plunger, the plunger is controlled by pressure to block or open the bypass port.

[0021] In some examples of the present invention, the air conditioning system further includes: a pressure switching valve, the pressure switching valve is connected to the pressure control chamber, and the pressure control chamber is connected to high-pressure exhaust or low-pressure intake through the pressure switching valve.

[0022] In some examples of the present invention, the first-stage compression component is a fixed-volume compression component and has a capacity of V1, the second-stage compression component is a variable-volume compression component, the full capacity of the second-stage compression component is V2, and the partial capacity is V2', wherein the capacity ratio of the exhaust gas of the first-stage compression component when flowing to the second-stage compression component through the conventional refrigerant flow path is A, wherein the capacity ratio of the exhaust gas of the first-stage compression component when flowing to the second-stage compression component through the refrigerant cooling flow path is B, wherein 0.6≤A=V2 / V1≤1, 0.3≤B=V2' / V1≤0.7.

[0023] In some examples of the present invention, the A further satisfies: A=0.85.

[0024] In some examples of the present invention, B further satisfies: B=0.5. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a cross-sectional view of a second cylinder of an air conditioning system according to an embodiment of the present invention when a plunger opens a bypass port;

[0027] Figure 2 is a cross-sectional view of a second cylinder of an air conditioning system according to an embodiment of the present invention when a plunger blocks a bypass port;

[0028] Figure 3-Figure 7 is a schematic diagram of a first specific embodiment of an air conditioning system according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of a second specific embodiment of an air conditioning system according to an embodiment of the present invention;

[0030] Fig. 9is a schematic diagram of a first outdoor heat exchanger and a second outdoor heat exchanger of an air-conditioning system according to an embodiment of the present invention being integrated into one to form an integrated outdoor heat exchanger;

[0031] Fig.10 is a schematic diagram of a third specific embodiment of an air conditioning system according to an embodiment of the present invention;

[0032] Fig.11 is a schematic diagram of an air conditioning system provided with a first reversing valve according to an embodiment of the present invention;

[0033] Fig.12 2 is a schematic diagram of an air conditioning system according to an embodiment of the present invention provided with two two-way valves.

[0034] Reference numerals:

[0035] Air conditioning system 10;

[0036] Compressor 1; housing 11;

[0037] A first stage compression assembly 12; an exhaust port 121;

[0038] Secondary compression assembly 13; air intake 131;

[0039] Refrigerant conventional flow path 2; refrigerant cooling flow path 3;

[0040] Cooling device 4; second outdoor heat exchanger 41;

[0041] Indoor heat exchanger 5; first outdoor heat exchanger 6;

[0042] Switching device 7; first reversing valve 71; two-way valve 72;

[0043] Air supply device 8; air supply port 81;

[0044] Oil separator 9; first heat exchange flow path 91; second heat exchange flow path 92; first cylinder 93; second cylinder 94; third cylinder 95;

[0045] Variable capacity cylinder 96; bypass port 961; plunger 962;

[0046] Pressure switching valve 97; pressure control chamber 98;

[0047] Bearing 99; partition 991; bypass channel 992 DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] Reference below Figure 1-Figure 12 A household air conditioner 10 according to an embodiment of the present invention is described. The household air conditioner 10 may be an air conditioning system 10 of the present application.

[0050] like Figure 1-Figure 10 As shown, the household air conditioner 10 according to the embodiment of the present invention includes: a compressor 1, an indoor heat exchanger 5 and a first outdoor heat exchanger 6. The compressor 1 may include: a shell 11, a primary compression assembly 12 and a secondary compression assembly 13, the primary compression assembly 12 may be arranged in the shell 11, the secondary compression assembly 13 may be arranged in the shell 11, at least one of the primary compression assembly 12 and the secondary compression assembly 13 is constructed as a variable capacity compression assembly, it should be explained that one of the primary compression assembly 12 and the secondary compression assembly 13 may be constructed as a variable capacity compression assembly, or the primary compression assembly 12 and the secondary compression assembly 13 may be constructed as variable capacity compression assemblies at the same time, and the variable capacity compression assembly may control the compression part to operate in two capacity modes: full load (also called full capacity) mode, partial load (also called partial capacity) mode.

[0051] The exhaust port 121 of the first-stage compression component 12 is connected to the intake port 131 of the second-stage compression component 13. The refrigerant discharged from the exhaust port 121 of the first-stage compression component 12 can flow to the intake port 131 of the second-stage compression component 13. A conventional refrigerant flow path 2 and a refrigerant cooling flow path 3 can be arranged between the exhaust port 121 of the first-stage compression component 12 and the intake port 131 of the second-stage compression component 13. A cooling device 4 for cooling the exhaust gas of the first-stage compression component 12 can be arranged on the refrigerant cooling flow path 3. The indoor heat exchanger 5 and the first outdoor heat exchanger 6 are respectively connected to the compressor 1. That is, the indoor heat exchanger 5 is connected to the compressor 1, and the first outdoor heat exchanger 6 is connected to the compressor 1.

[0052] Among them, the refrigerant discharged after compression by the primary compression component 12 enters the secondary compression component 13 for a second compression. This compression method of connecting the two compression components in series is called two-stage compression. When the refrigerant passes through the refrigerant cooling flow path 3, since the temperature of the refrigerant discharged from the primary compression component 12 is overheated to a certain extent, if it is cooled by the cooling device 4 and then compressed by the secondary compression component 13, it can be known through the pressure-enthalpy diagram analysis that this is conducive to reducing the power consumption of the secondary compression component 13, and it is also conducive to reducing the exhaust temperature of the secondary compression component 13. In addition, two operating modes, namely, the conventional refrigerant flow path 2 or the refrigerant cooling flow path 3, can be selected according to actual conditions, and in each operating mode, the variable capacity compression component can be controlled to operate within the optimal capacity ratio range, thereby improving the working performance of the household air conditioner 10. In addition, the mode in which the refrigerant discharged from the primary compression component 12 is cooled by temperature reduction and then reaches the secondary compression component 13 for compression is called two-stage compression with intermediate cooling function, and the cooling function can improve the performance of the household air conditioner 10.

[0053] Therefore, the household air conditioner 10 can select two operating modes, namely the conventional refrigerant flow path 2 and the refrigerant cooling flow path 3, according to actual conditions, and in each operating mode, the variable capacity compression component can be controlled to operate within the optimal capacity ratio range, thereby improving the performance of the household air conditioner 10.

[0054] In some embodiments of the present invention, Figure 3-Figure 10 As shown, the household air conditioner 10 may further include: a switching device 7, which may be arranged between the conventional refrigerant flow path 2 and the refrigerant cooling flow path 3, and the switching device 7 may be used to switch the refrigerant flow direction, so that the exhaust of the primary compression assembly 12 can selectively flow through the conventional refrigerant flow path 2 or the refrigerant cooling flow path 3 to the air intake port 131 of the secondary compression assembly 13. Among them, the cooling function has application limitations, for example: the cooling function is limited to the cooling mode, and the heating capacity will be reduced when the cooling function is operated in the heating mode. Therefore, by adding the switching device 7, the exhaust of the primary compression assembly 12 in the cooling mode can flow through the refrigerant cooling flow path 3 to the air intake port 131 of the secondary compression assembly 13, and the exhaust of the primary compression assembly 12 in the heating mode can flow through the conventional refrigerant flow path 2 to the air intake port 131 of the secondary compression assembly 13.

[0055] In some embodiments of the present invention, the switching device 7 may include a reversing valve, which can change the flow direction of the refrigerant in the refrigerant flow path, so that the exhaust gas of the first-stage compression component 12 can selectively flow to the suction port 131 of the second-stage compression component 13 through the refrigerant conventional flow path 2 or the refrigerant cooling flow path 3. In addition, the reversing valve has good working reliability and is not easy to be damaged. Such a setting can ensure the working reliability of the switching device 7 and also extend the service life of the switching device 7.

[0056] In some embodiments of the present invention, the reversing valve can be set as a three-way reversing valve. Such a setting can make the design of the reversing valve more reasonable, and can accurately control the exhaust of the first-stage compression component 12 through the refrigerant conventional flow path 2 or the refrigerant cooling flow path 3, thereby ensuring the working performance of the household air conditioner 10.

[0057] In some embodiments of the present invention, Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Fig.10As shown, the cooling device 4 may include: a second outdoor heat exchanger 41, which may be arranged on the refrigerant cooling flow path 3. When the exhaust gas of the first-stage compression component 12 passes through the second outdoor heat exchanger 41 on the refrigerant cooling flow path 3, the refrigerant may exchange heat with the environment. After the heat exchange of the refrigerant is completed, the refrigerant may flow to the intake port 131 of the second-stage compression component 13.

[0058] In some embodiments of the present invention, Figure 3-Figure 10 As shown, the household air conditioner 10 may also include: an air supply device 8, which may be arranged between the indoor heat exchanger 5 and the first outdoor heat exchanger 6, and the air supply device 8 may have an air supply port 81 connected to the air intake port 131 of the secondary compression component 13, and the air intake port 131 of the secondary compression component 13 is connected to the air supply port 81 of the air supply device 8, so that the gas in the air supply device 8 can flow into the secondary compression component 13. If part of the gas inhaled by the secondary compression component 13 comes from the exhaust of the primary compression component 12, and the other part of the gas comes from the air supply device 8, it is called a two-stage compression with an air supply function. Among them, the air supply device 8 can provide air supply to the compressor 1, and adding the air supply function can greatly increase the performance of the household air conditioner 10, so it is preferred that the household air conditioner 10 is provided with an air supply device 8. It should be noted that if the household air conditioner 10 includes two-stage compression and an air supply device 8 at the same time, the cooling function of the household air conditioner 10 is better.

[0059] There are two types of intermediate cooling methods. The first is to exchange heat between the exhaust gas of the first-stage compression component 12 and the environment through the second outdoor heat exchanger 41. This method generally cannot cool the refrigerant gas to the corresponding saturation temperature, so it is called an incomplete cooling method. The second is to exchange heat between the exhaust gas of the first-stage compression component 12 and the air supply device 8 to reduce the temperature of the first-stage exhaust gas. This method can cool the first-stage exhaust gas to the corresponding saturation temperature, so it is also called a complete cooling method. Of course, if Figure 6 As shown, the intermediate cooling can pass through the second outdoor heat exchanger 41 and the air supplement device 8 at the same time, but it needs to pass through the second outdoor heat exchanger 41 first and then pass through the air supplement device 8.

[0060] In some embodiments of the present invention, the air supply device 8 can be configured as a gas-liquid separation type air supply device 8 or a heat exchanger type air supply device 8. It should be explained that the gas-liquid separation type air supply device 8 can be a flash evaporator or a flash evaporator, and the heat exchanger type air supply device 8 can be a subcooler or an economizer. Such a configuration enables the air supply device 8 to better supply air to the secondary compression assembly 13, thereby improving the working performance of the household air conditioner 10.

[0061] In some embodiments of the present invention, the cooling device 4 includes: an air supply device 8, which is arranged between the indoor heat exchanger 5 and the first outdoor heat exchanger 6, and the air supply device 8 has an air supply port 81 connected to the air intake port 131 of the secondary compression component 13. Such a setting can further reduce the power consumption of the secondary compression component 13, and can also further reduce the exhaust temperature of the secondary compression component 13, etc., thereby further improving the performance of the household air conditioner 10.

[0062] In some embodiments of the present invention, Figure 7 As shown, the household air conditioner 10 may further include: an oil separator 9, which may be arranged on the refrigerant cooling flow path 3, and the oil separator 9 is located on the upstream side of the air supply device 8. Among them, if the exhaust of the first-stage compression component 12 is not discharged through the internal space of the shell 11, but is directly discharged, the oil content will be very large. At this time, if the air supply device 8 is a gas-liquid separation type air supply device 8, the oil may not reach the second-stage compression component 13, but is separated by the gas-liquid separation type air supply device 8 and flows to the evaporator, causing the heat exchange of the evaporator to be blocked, the performance is reduced, and it is easy to cause the compressor 1 to lack oil. Therefore, it is preferred to add an oil separator 9 before the gas-liquid separation type air supply device 8 at this time. Such a setting can make the oil directly return to the compressor 1 without flowing to the gas-liquid separation type air supply device 8, so that the evaporator can work normally.

[0063] In some embodiments of the present invention, Figure 6 As shown, the cooling device 4 may further include: a second outdoor heat exchanger 41. The second outdoor heat exchanger 41 may be arranged on the refrigerant cooling flow path 3, and the second outdoor heat exchanger 41 may be located on the upstream side of the air supply device 8. When the refrigerant discharged from the exhaust port 121 of the first-stage compression component 12 flows through the refrigerant cooling flow path 3, such an arrangement enables the refrigerant to undergo heat exchange twice, so that the refrigerant discharged from the exhaust port 121 of the first-stage compression component 12 can be fully heat exchanged, thereby ensuring that the refrigerant discharged from the exhaust port 121 of the first-stage compression component 12 reaches the saturation temperature.

[0064] In some embodiments of the present invention, Fig. 9 As shown, the first outdoor heat exchanger 6 and the second outdoor heat exchanger 41 can be integrated into one. Such an arrangement can form an integrated outdoor heat exchanger. The integrated outdoor heat exchanger may include: a first heat exchange flow path 91 and a second heat exchange flow path 92. The first heat exchange flow path 91 can be constructed as the first outdoor heat exchanger 6, and the second heat exchange flow path 92 can be constructed as the second outdoor heat exchanger 41. Such an arrangement can make the structure of the integrated outdoor heat exchanger simpler, reduce the number of components that make up the household air conditioner 10, and thus reduce the manufacturing cost of the household air conditioner 10.

[0065] In some embodiments of the present invention, Figure 8As shown, the first-stage compression assembly 12 may include: a first cylinder 93; the second-stage compression assembly 13 may include: a second cylinder 94 and a third cylinder 95, the exhaust port 121 of the first cylinder 93 may be configured as the exhaust port 121 of the first-stage compression assembly 12, and the intake port 131 of the second cylinder 94 and the intake port 131 of the third cylinder 95 together constitute the intake port 131 of the second-stage compression assembly 13. Among them, the second cylinder 94 and the third cylinder 95 may be connected in parallel compression, and one of the second cylinder 94 and the third cylinder 95 may be provided with a variable capacity mechanism, and the cylinder provided with the variable capacity mechanism may switch between working and idling under the control of the variable capacity mechanism.

[0066] In some embodiments of the present invention, Figure 8 As shown, the second cylinder 94 is set as a constant volume cylinder, and the third cylinder 95 is set as a variable volume cylinder 96. When the household air conditioner 10 is working, the third cylinder 95 can switch between working and idling under the control of the variable volume mechanism, thereby ensuring the working performance of the household air conditioner 10.

[0067] In some embodiments of the present invention, Fig.10 As shown, the first-stage compression assembly 12 may include: a first cylinder 93 and a second cylinder 94, and the second-stage compression assembly 13 may include: a third cylinder 95. The exhaust port 121 of the first cylinder 93 and the exhaust port 121 of the second cylinder 94 together constitute the exhaust port 121 of the first-stage compression assembly 12, and the intake port 131 of the third cylinder 95 may be constructed as the intake port 131 of the second-stage compression assembly 13. Such an arrangement can ensure that the refrigerant discharged from the exhaust ports 121 of the first cylinder 93 and the second cylinder 94 can flow to the third cylinder 95, thereby ensuring the normal operation of the household air conditioner 10.

[0068] In some embodiments of the present invention, the first cylinder 93 and the third cylinder 95 are both configured as constant volume cylinders, and the second cylinder 94 is configured as a variable volume cylinder 96. The exhaust port 121 of the first cylinder 93, the exhaust port 121 of the second cylinder 94, and the air intake port 131 of the third cylinder 95 are all connected to each other, and the second cylinder 94 may be provided with a variable volume structure, which may control whether the second cylinder 94 is working.

[0069] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the variable capacity compression assembly may include: a variable capacity cylinder 96, which may be connected to a bypass port 961, and the compressor 1 may further include: a plunger 962, which is controlled by pressure to block or open the bypass port 961.

[0070] Among them, the upper and lower sides of the variable volume cylinder 96 are sealed by bearings 99 or partitions 991, and a compression chamber for compressed gas is formed by parts such as the variable volume cylinder 96, bearings 99 or partitions 991. The bearings 99 or partitions 991 can be provided with a bypass port 961, and the bypass port 961 can be provided with a plunger 962. One side of the plunger 962 is the compression chamber, and the other side of the plunger 962 is connected to the intake port 131 of the secondary compression assembly 13 through the bypass channel 992.

[0071] When the secondary compression assembly 13 is constructed as a variable capacity compression assembly, there are many ways to change the capacity of the secondary compression assembly 13, among which the following two are preferred:

[0072] The first one is that the two-stage compression assembly 13 includes two compression chambers connected in parallel, and the variable capacity mechanism can be used to control whether one of the compression chambers is working, thereby realizing variable capacity operation of the two-stage compression assembly 13.

[0073] The first is: the two-stage compression component 13 has only one compression chamber, and the compression chamber is provided with a bypass port 961, and a plunger 962 is provided in the bypass port 961. One end of the plunger 962 is connected to the intake port 131 of the two-stage compression component 13. Through the plunger 962, it can be realized whether the gas in the compression chamber bypasses back to the intake port 131, thereby realizing the variable capacity operation of the two-stage compression component 13. If this bypass port 961 is set on the cylinder of the rotary compressor 1, due to its shape and structure, the compression efficiency will be low due to the clearance capacity and leakage problems. If the bypass port 961 is set on the partition 991 or the bearing 99, due to its shape, the clearance capacity can be made smaller and the leakage after matching is less, so its advantages are obvious.

[0074] In some embodiments of the present invention, the household air conditioner 10 may further include: a pressure switching valve 97, which is connected to a pressure control chamber 98. It should be noted that the pressure control chamber 98 refers to the above-mentioned compression chamber. The pressure control chamber 98 can be connected to high-pressure exhaust or low-pressure suction through the pressure switching valve 97. When the pressure switching valve 97 controls the pressure control chamber 98 to be connected to the high-pressure exhaust, the plunger 962 blocks the bypass port 961. When the pressure switching valve 97 controls the pressure control chamber 98 to be connected to the low-pressure suction, the plunger 962 opens the bypass port 961, thereby achieving the working purpose of the plunger 962 blocking or opening the bypass port 961.

[0075] In some embodiments of the present invention, the first-stage compression component 12 is configured as a constant-volume compression component, and its capacity is V1, and the second-stage compression component 13 is configured as a variable-volume compression component, the full capacity of the second-stage compression component 13 is V2, and the partial capacity is V2', wherein the capacity ratio (capacity ratio = actual operating capacity of the second-stage compression component 13: capacity of the first-stage compression component 12) when the exhaust gas of the first-stage compression component 12 flows to the second-stage compression component 13 through the conventional refrigerant flow path 2 is A, and the capacity ratio of the exhaust gas of the first-stage compression component 12 when it flows to the second-stage compression component 13 through the refrigerant cooling flow path 3 is B, B<A, wherein 0.6≤A=V2 / V1≤1, 0.3≤B=V2' / V1≤0.7.

[0076] Among them, the exhaust temperature and exhaust pressure after the first compression are determined by the capacity ratio of the first compression component 12 and the second compression component 13. Compared with no intermediate cooling, the intermediate pressure and intermediate temperature required after cooling need to be higher, so that the temperature reduction after intermediate cooling is more obvious, and the energy efficiency effect is more obvious. Through theoretical analysis and calculation, the capacity ratio required after increasing intermediate cooling (capacity ratio = capacity of the second compression component 13 / capacity of the first compression component 12) needs to be reduced (Note: the capacity of the compression chamber is the actual suction volume of the compression chamber in a compression cycle). In order to reduce the capacity ratio, the capacity of the first compression component 12 can be increased or the capacity of the second compression component 13 can be reduced. However, when the load is increased, the application effect is better when the capacity and capacity ratio of the first compression component 12 need to be increased at the same time. In this case, although increasing the displacement of the first compression component 12 increases the capacity of the first compression component 12, it reduces the capacity ratio, and the application is relatively limited. Therefore, it is better to use the variable capacity method of the second compression component 13.

[0077] In some embodiments of the present invention, A can further satisfy: A=0.85. Such a setting can make the capacity ratio of the exhaust gas of the first-stage compression component 12 flowing to the second-stage compression component 13 through the conventional refrigerant flow path 2 more reasonable, thereby improving the working performance of the household air conditioner 10.

[0078] In some embodiments of the present invention, B can further satisfy: B=0.5, the capacity ratio when the exhaust gas of the first-stage compression component 12 flows to the second-stage compression component 13 through the refrigerant cooling flow path 3 is more reasonable, which can further improve the working performance of the household air conditioner 10.

[0079] in, Figure 1 Schematic diagram of the variable volume structure. The plunger 962 is in the open state. The gas in the second cylinder 94 can bypass back to the air intake port 131 of the second cylinder 94. The second cylinder 94 is in a partial load operation state. Figure 2It is a schematic diagram of a variable volume structure, in which the plunger 962 is in a closed state, the gas in the second cylinder 94 cannot bypass back to the air intake port 131 of the second cylinder 94, and the second cylinder 94 is in a full-load operation state. Figure 3-Figure 7 It is a schematic diagram of the first specific embodiment. Figure 8 is a schematic diagram of a second specific embodiment. Fig. 9 and Figure 8 The difference is: Figure 8 The outdoor heat exchanger is two heat exchangers, and Fig. 9 For the same heat exchanger. Fig.10 A schematic diagram of a third specific embodiment.

[0080] like Figure 3 , Attachment Figure 4 , Figure 5 , Figure 6 , Figure 7 and Fig. 9 As shown, according to the first specific embodiment of the present invention, Figure 3 and Figure 4 Only the type of air supply device 8 is different. Figure 3 The air supply device 8 is a heat exchanger type air supply device 8, Figure 4 The air replenishing device 8 is a gas-liquid separation type air replenishing device 8, and both types of air replenishing devices 8 can realize the air replenishing function.

[0081] Figure 4 and Figure 5 Only the switching device 7 is placed at a different position, but the same function can be achieved.

[0082] According to the first specific embodiment of the present invention, the compressor 1 includes two cylinders, wherein the first-stage compression component 12 is the first cylinder 93, and the second-stage compression component 13 is the second cylinder 94. The exhaust port 121 of the first cylinder 93 is connected to the intake port 131 of the second cylinder 94. The second cylinder 94 is a variable capacity cylinder 96. The variable capacity mechanism of the second cylinder 94 is specifically arranged on the partition 991, so that the second cylinder 94 can operate with variable capacity.

[0083] The variable displacement cylinder 96 is composed of a bypass port 961, a plunger 962, a bypass channel 992, a pressure chamber, high and low pressure ports and a pressure switching valve 97. The specific structure is as follows: the partition 991 has a bypass port 961, a plunger 962 is arranged in the bypass port 961, one side of the plunger 962 is a compression chamber, and the other side is provided with a pressure control chamber 98. The pressure control chamber 98 is also selectively connected to the intake port 131 or the exhaust port 121 through the control of the pressure switching valve 97. By switching the pressure switching valve 97, the pressure of the compression chamber can be controlled to be the intake pressure or the exhaust pressure (high pressure when connected to the exhaust, and low pressure when connected to the intake), so that the plunger 962 can move in the bypass hole, thereby realizing the opening or closing of the bypass hole. Furthermore, the bypass channel 992 is connected to the bypass port 961 and the air intake port 131 of the second cylinder 94 . When the bypass port 961 is opened, the gas in the compression chamber can flow back to the air intake port 131 of the second cylinder 94 through the bypass channel 992 .

[0084] The pressure control chamber 98 can control the pressure chamber to be connected with the air intake port 131 or the air exhaust port 121. When the pressure control chamber 98 is connected with the air exhaust port 121, the pressure of the pressure control chamber 98 is the exhaust pressure. The pressure of the pressure control chamber 98 is greater than or equal to the pressure of the compression chamber. Under the action of the pressure difference, the plunger 962 closes the bypass port 961. The gas in the compression chamber of the second cylinder 94 cannot bypass the air intake port 131. Then, all the gas inhaled by the second cylinder 94 can only be compressed and discharged through the air exhaust port of the second cylinder 94. At this time, The second cylinder 94 operates at full load. When the pressure control chamber 98 is connected to the intake port 131, the pressure in the pressure control chamber 98 is the intake pressure. At this time, the pressure in the pressure control chamber 98 is ≤ the compression chamber pressure. Under the action of the pressure difference, the plunger 962 moves toward the pressure control chamber 98, so the bypass port 961 is opened. The gas in the compression chamber of the second cylinder 94 will partially bypass the intake port 131, and the remaining part will be compressed and discharged through the exhaust port of the second cylinder 94. At this time, the second cylinder 94 operates at partial capacity.

[0085] Assume that the capacity of the first cylinder 93 is V1, the capacity of the second cylinder 94 at full load is V2, the capacity of the cylinder at partial load is V2', and the designed capacity relationship satisfies the following relationship: cylinder ratio A = V2 / V1 = 0.85 at full load, cylinder ratio B = V2' / V1 = 0.5 at partial load;

[0086] When the intermediate cooling is not in operation, in order to maintain better system energy efficiency, the capacity is relatively large. At this time, it is sufficient for the second cylinder 94 to operate at full load; when the intermediate cooling is in operation, in order to maintain better system energy efficiency, the required capacity ratio will be relatively small. At this time, partial load operation of the second cylinder 94 can be achieved. Finally, the household air conditioner 10 operates at a better capacity ratio according to whether intermediate cooling is used, so as to achieve better energy efficiency.

[0087] like Figure 8 As shown, according to the second specific embodiment of the present invention, the compressor 1 may include: three cylinders, the exhaust port 121 of the first cylinder 93, the intake port 131 of the second cylinder 94, and the intake port 131 of the third cylinder 95 are all connected to each other, and the third cylinder 95 is also provided with a variable volume structure, which can control whether the third cylinder 95 works. The first cylinder 93 constitutes a first-stage compression assembly 12, and the second cylinder 94 and the third cylinder 95 constitute a second-stage compression assembly 13.

[0088] Assume that the capacity of the first cylinder 93 is V1, the capacity of the second cylinder 94 is V2, and the capacity of the third cylinder 95 is V3, then: when the third cylinder 95 is working, the capacity ratio = the capacity of the second compression component 13 / the capacity ratio of the first compression component 12 = (V2+V3) / V1, when the third cylinder 95 is not working, the capacity ratio = the capacity of the second compression component 13 / the capacity ratio of the first compression component 12 = V2 / V1, and the capacity ratio satisfies (V2+V3) / V1=0.85, V2 / V1=0.5.

[0089] The structure of the variable volume cylinder 96 is that an independent vane pressure control chamber 98 is provided on the back of the vane of the third cylinder 95, and no spring is provided on the back of the vane. The pressure control chamber 98 is connected with the intake port 131 and the exhaust port 121 of the compressor 1 through the pressure switching valve 97. When the pressure control chamber 98 is connected with the exhaust port 121, the third cylinder 95 works, and when the pressure control chamber 98 is connected with the intake port 131, the third cylinder 95 does not work.

[0090] When the intermediate cooling is not in operation and the capacity ratio is relatively large, the system energy efficiency is better. At this time, the third cylinder 95 can be controlled to work, so that the second-stage compression component 13 can run at full capacity. At this time, the capacity ratio can meet the larger demand. When the intermediate cooling is in operation, the required optimal capacity ratio will be smaller. At this time, the third cylinder 95 can be controlled not to work through the variable capacity structure, that is, the second-stage compression component 13 runs at partial capacity, which reduces the capacity. Finally, the household air conditioner 10 adopts a better capacity ratio operation according to whether the intermediate cooling is adopted, so as to make the energy efficiency better.

[0091] like Fig.10 As shown, according to the third specific embodiment of the present invention, the compressor 1 includes three cylinders, the exhaust port 121 of the first cylinder 93, the exhaust port 121 of the second cylinder 94, and the intake port 131 of the third cylinder 95 are all connected to each other, and the second cylinder 94 is also provided with a variable volume structure, which can control whether the second cylinder 94 works. The first cylinder 93 and the second cylinder 94 form a first-stage compression assembly 12, and the third cylinder 95 forms a second-stage compression assembly 13.

[0092] Assume that the capacity of the first cylinder 93 is V1, the capacity of the second cylinder 94 is V2, and the capacity of the third cylinder 95 is V3. When the second cylinder 94 is working, the capacity ratio = the capacity of the second compression component 13 / the capacity ratio of the first compression component 12 = V3 / (V1+V2). When the second cylinder 94 is not working, the capacity ratio = the capacity of the second compression component 13 / the capacity ratio of the first compression component 12 = V3 / V1. The capacity ratio satisfies V3 / (V1+V2)=0.5, V3 / V1=0.85.

[0093] The structure of the variable volume cylinder 96 is that an independent pressure control chamber 98 is provided on the back of the sliding vane of the second cylinder 94, and no spring is provided on the back of the pressure control chamber 98. The pressure control chamber 98 is connected with the intake port 131 and the exhaust port 121 of the compressor 1 through the pressure switching valve 97. When the pressure control chamber 98 is connected with the exhaust port 121, the second cylinder 94 works, and when the pressure control chamber 98 is connected with the intake port 131, the second cylinder 94 does not work.

[0094] When the intercooling is not in operation and the capacity ratio is relatively large, the system energy efficiency is better. At this time, the second cylinder 94 can be controlled not to work, and the first-stage compression component 12 can be operated at full capacity. At this time, the capacity ratio can meet greater needs. When the intercooling is in operation, the required optimal capacity ratio will be smaller. At this time, the second cylinder 94 can be controlled to work through the variable capacity structure, that is, the first-stage compression component 12 runs at full capacity. Finally, the household air conditioner 10 adopts a better capacity ratio operation according to whether the intercooling is adopted, so as to make the energy efficiency better.

[0095] like Fig.11 As shown, the conventional refrigerant flow path 2 can be simultaneously provided with a switching device 7 and a first reversing valve 71. Both the switching device 7 and the first reversing valve 71 can be three-way reversing valves. The switching device 7 is connected to the first reversing valve 71, one end of the cooling device 4 is connected to the switching device 7, and the other end of the cooling device 4 is connected to the first reversing valve 71.

[0096] like Fig.12 As shown, a switching device 7 can be provided on the conventional flow path 2 of the refrigerant, one end of the cooling device 4 is connected to one end of the switching device 7, and the other end of the cooling device 4 is connected to the other end of the switching device 7. A two-way valve 72 can be provided between one end of the cooling device 4 and one end of the switching device 7, and a two-way valve 72 can also be provided between the other end of the cooling device 4 and the other end of the switching device 7. By cooperating with the switching device 7 and the two two-way valves 72, the flow path of the refrigerant can be better controlled, thereby improving the performance of the household air conditioner 10.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0098] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioning system, characterized in that: include: A compressor, the compressor comprising: a shell, a first-stage compression assembly and a second-stage compression assembly, the first-stage compression assembly is arranged in the shell, the second-stage compression assembly is arranged in the shell, at least one of the first-stage compression assembly and the second-stage compression assembly is configured as a variable capacity compression assembly, a refrigerant conventional flow path and a refrigerant cooling flow path are arranged between an exhaust port of the first-stage compression assembly and an air intake port of the second-stage compression assembly, and a cooling device for cooling the exhaust gas of the first-stage compression assembly is arranged on the refrigerant cooling flow path; An indoor heat exchanger and a first outdoor heat exchanger, wherein the indoor heat exchanger and the first outdoor heat exchanger are respectively connected to the compressor; The first-stage compression component is a fixed-volume compression component and has a capacity of V1, and the second-stage compression component is a variable-volume compression component, the full capacity of the second-stage compression component is V2, and the partial capacity is V2', wherein the capacity ratio of the exhaust gas of the first-stage compression component when flowing to the second-stage compression component through the conventional refrigerant flow path is A, and the capacity ratio of the exhaust gas of the first-stage compression component when flowing to the second-stage compression component through the refrigerant cooling flow path is B, and B<A.

2. The air conditioning system according to claim 1, characterized in that: Also includes: A switching device, wherein the switching device is arranged between the conventional refrigerant flow path and the refrigerant cooling flow path and is used to switch the refrigerant flow direction, so that the exhaust gas of the first-stage compression component can selectively flow to the intake port of the second-stage compression component through the conventional refrigerant flow path or the refrigerant cooling flow path.

3. The air conditioning system according to claim 2, characterized in that: The switching device comprises a reversing valve.

4. The air conditioning system according to claim 3, characterized in that: The reversing valve is a three-way reversing valve.

5. The air conditioning system according to claim 1, characterized in that: The cooling device includes a second outdoor heat exchanger, and the second outdoor heat exchanger is arranged on the refrigerant cooling flow path.

6. The air conditioning system according to claim 1, characterized in that: Also includes: An air supply device is arranged between the indoor heat exchanger and the first outdoor heat exchanger, and the air supply device has an air supply port connected to the air intake port of the secondary compression component.

7. The air conditioning system according to claim 6, characterized in that: The air replenishing device is a gas-liquid separation type air replenishing device or a heat exchanger type air replenishing device.

8. The air conditioning system according to claim 1, characterized in that: The cooling device comprises: an air supply device, which is arranged between the indoor heat exchanger and the first outdoor heat exchanger, and has an air supply port connected to the air intake port of the two-stage compression component.

9. The air conditioning system according to claim 8, characterized in that: Also includes: An oil separator is provided on the refrigerant cooling flow path and is located on the upstream side of the air supply device.

10. The air conditioning system according to claim 8, characterized in that: The cooling device further includes: a second outdoor heat exchanger, which is disposed on the refrigerant cooling flow path and located at an upstream side of the air supply device.

11. The air conditioning system according to claim 5 or 10, characterized in that: The first outdoor heat exchanger and the second outdoor heat exchanger are integrated into one to form an integrated outdoor heat exchanger, and the integrated outdoor heat exchanger includes: a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is configured as the first outdoor heat exchanger, and the second heat exchange flow path is configured as the second outdoor heat exchanger.

12. The air conditioning system according to claim 1, characterized in that: The first-stage compression assembly includes: a first cylinder; the second-stage compression assembly includes: a second cylinder and a third cylinder; the exhaust port of the first cylinder is constructed as the exhaust port of the first-stage compression assembly, and the intake port of the second cylinder and the intake port of the third cylinder together constitute the intake port of the second-stage compression assembly.

13. The air conditioning system according to claim 12, characterized in that: The second cylinder is a constant volume cylinder, and the third cylinder is a variable volume cylinder.

14. The air conditioning system according to claim 1, characterized in that: The first-stage compression assembly includes: a first cylinder and a second cylinder; the second-stage compression assembly includes: a third cylinder; the exhaust port of the first cylinder and the exhaust port of the second cylinder together constitute the exhaust port of the first-stage compression assembly, and the intake port of the third cylinder is constructed as the intake port of the second-stage compression assembly.

15. The air conditioning system according to claim 14, characterized in that: The first cylinder and the third cylinder are both constant volume cylinders, and the second cylinder is a variable volume cylinder.

16. The air conditioning system according to claim 1, characterized in that: The variable capacity compression assembly comprises: a variable capacity cylinder, which is connected to a bypass port. The compressor further comprises: a plunger, which is controlled by pressure to block or open the bypass port.

17. The air conditioning system according to claim 16, characterized in that: Also includes: A pressure switching valve is connected to a pressure control chamber, and the pressure control chamber is connected to high-pressure exhaust or low-pressure intake through the pressure switching valve.

18. The air conditioning system according to claim 1, characterized in that: Among them, 0.6≤A=V2 / V1≤1, 0.3≤B=V2' / V1≤0.

7.

19. The air conditioning system according to claim 18, characterized in that: The A further satisfies: A=0.

85.

20. The air conditioning system according to claim 18, characterized in that The B further satisfies: B=0.5.

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