CN107489617B

CN107489617B - Rotary compressor and air conditioning system with same

Info

Publication number: CN107489617B
Application number: CN201710750649.9A
Authority: CN
Inventors: 巫华龙
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2017-08-28
Filing date: 2017-08-28
Publication date: 2024-01-05
Anticipated expiration: 2037-08-28
Also published as: CN107489617A

Abstract

The invention discloses a rotary compressor and an air conditioning system with the same, the rotary compressor comprises: a housing; the compression mechanism is arranged in the shell and comprises a single-stage compression cylinder and a two-stage compression cylinder, the single-stage compression cylinder is provided with a single-stage compression cavity, a single-stage air suction port and a single-stage air exhaust port, the two-stage compression cylinder comprises a first-stage compression cylinder and a second-stage compression cylinder, the first-stage compression cylinder is provided with a first-stage compression cavity and a first air suction port, the second-stage compression cylinder is provided with a second-stage compression cavity and a first air exhaust port, and the compression mechanism is provided with a mixing cavity communicated with the first-stage compression cavity and the second-stage compression cavity and a first air injection flow path communicated with the mixing cavity; and the motor component is arranged in the shell and is suitable for driving the compression mechanism to work. The rotary compressor provided by the embodiment of the invention can simultaneously give consideration to the capacity and the energy efficiency, and improves the working performance.

Description

Rotary compressor and air conditioning system with same

Technical Field

The invention relates to the technical field of air conditioners, in particular to a rotary compressor and an air conditioning system with the same.

Background

As the ambient temperature decreases, the specific volume of the refrigerant increases, and the unit intake amount of the rolling rotor compressor decreases, resulting in a significant decrease in the heating capacity of the compressor. While the lower the temperature, the greater the heat demand of the room, the two-stage compressor in the related art cannot fully satisfy the heat demand.

In some occasions, such as a multi-split system (one external unit and a plurality of internal units), the system load changes with the opening and closing amounts of the internal units, when the compressor is in full load, the compressor is expected to meet the requirement of high capacity, and when the compressor is in partial load, the compressor is expected to operate efficiently. Conventional compressors are fixed capacity, and even with up-conversion techniques, it is difficult to combine both requirements.

The conventional common refrigeration and heating circulation device is easy to generate excessive refrigeration capacity under a small-load working condition, such as an intermediate refrigeration condition, so that energy waste is caused, and meanwhile, under a large-load working condition, such as ultralow-temperature heating, the phenomenon of insufficient heating capacity is easy to generate, and the efficiency is low. In addition, the system can realize rapid cooling and heating in the requirement of users, and the flow of the refrigerant cannot be rapidly increased.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the invention proposes a rotary compressor that can combine both capacity and energy efficiency.

The invention also provides an air conditioning system with the rotary compressor.

According to an embodiment of the present invention, a rotary compressor includes: a housing; the compression mechanism is arranged in the shell and comprises a single-stage compression cylinder and a two-stage compression cylinder, the single-stage compression cylinder is provided with a single-stage compression cavity, a single-stage air suction port and a single-stage exhaust port, the two-stage compression cylinder comprises a first-stage compression cylinder and a second-stage compression cylinder, the first-stage compression cylinder is provided with a first-stage compression cavity and a first air suction port, the second-stage compression cylinder is provided with a second-stage compression cavity and a first exhaust port, and the compression mechanism is provided with a mixing cavity communicated with the first-stage compression cavity and the second-stage compression cavity and a first air injection flow path communicated with the mixing cavity; and the motor component is arranged in the shell and is suitable for driving the compression mechanism to work.

The rotary compressor provided by the embodiment of the invention can simultaneously give consideration to the capacity and the energy efficiency, and improves the working performance.

In addition, the rotary compressor according to the above embodiment of the present invention may have the following additional technical features:

according to some embodiments of the invention, the single stage compression chambers, the first stage compression chambers and the second stage compression chambers are arranged randomly along an axial direction of the compression mechanism.

Optionally, an exhaust cavity communicated with the first exhaust port is further arranged in the compression mechanism.

Further, the discharge chamber is defined by two stacked diaphragms disposed between any two of the single stage compression chamber, the first stage compression chamber and the second stage compression chamber.

According to some embodiments of the invention, the mixing chamber is defined by two stacked baffles disposed between any two of the single stage compression chamber, the first stage compression chamber, and the second stage compression chamber, or the mixing chamber is defined by a bearing of the compression mechanism and a cover plate disposed on the bearing.

Optionally, the single stage compression cylinder is switchable between a cylinder-rest operating condition and a cylinder-de-rest operating condition.

Further, the single-stage compression cylinder realizes the switching between the cylinder-rest operation state and the cylinder-rest release operation state by controlling the suction pressure.

The rotary compressor according to the embodiment of the present invention further includes: and the second air injection flow path is communicated with the single-stage compression cavity.

Further, the second air jet flow path is provided with a one-way valve for controlling the one-way delivery of the air to the single-stage compression cavity, and the one-way valve is arranged inside or outside the compression mechanism.

Optionally, a sliding vane back pressure cavity with variable pressure is arranged in the single-stage compression cylinder, so that the single-stage compression cylinder can be switched between a cylinder-rest operation state and a cylinder-rest release operation state by controlling the back pressure of the sliding vane.

The rotary compressor according to the embodiment of the present invention further includes: the second jet flow path is communicated with the single-stage compression cavity, and an electromagnetic valve for controlling on-off of the second jet flow path is arranged on the second jet flow path.

Optionally, the first air jet of the first air jet flow path is arranged on the first stage compression cylinder, the second stage compression cylinder, the bearing, the partition plate or the cover plate.

Optionally, the second air jet of the second air jet flow path is arranged on a single-stage compression cylinder, a bearing, a partition plate or a cover plate.

In some embodiments of the invention, the first and second air jet flow paths communicate with the same external air jet circuit located outside the enclosure.

Optionally, the slide in the single stage compression chamber is configured such that its position is controlled by adjusting the pressure in the slide back pressure chamber.

According to some embodiments of the invention, the compression mechanism is provided with a magnetic element which acts with a sliding vane in the single-stage compression cavity so as to brake the sliding vane when the single-stage compression cylinder is in a cylinder-rest operation state.

Optionally, the working displacement of the single-stage compression cylinder is V1, and the working displacement of the first-stage compression cylinder is V3, wherein V1/v3=0.35-1.8.

Optionally, the working displacement of the second stage compression cylinder is V2, and the working displacement of the first stage compression cylinder is V3, where V2/v3=0.55-0.95.

An air conditioning system according to an embodiment of the present invention includes a rotary compressor according to an embodiment of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural view of a rotary compressor according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a compression mechanism of a rotary compressor according to one embodiment of the present invention;

FIG. 3 is another cross-sectional view of a compression mechanism of a rotary compressor according to one embodiment of the present invention;

fig. 4 is a sectional view of a compression mechanism of a rotary compressor according to another embodiment of the present invention;

FIG. 5 is a schematic illustration of the position of a second gas jet of a rotary compressor according to an embodiment of the present invention;

FIG. 6 is a schematic view showing an installation position and a structure of a check valve of a rotary compressor according to an embodiment of the present invention;

FIG. 7 is a graph of COP versus V2/V3 for a rotary compressor according to an embodiment of the present invention;

FIG. 8 is a graph of COP versus V1/V3 for a rotary compressor according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an air conditioning system according to an embodiment of the present invention;

fig. 10 is a schematic structural view of an air conditioning system according to another embodiment of the present invention;

fig. 11 is a schematic structural view of an air conditioning system according to still another embodiment of the present invention.

Reference numerals:

an air conditioning system 1000;

a rotary compressor 100; a condenser 200; flash vessel 300; an evaporator 400; a first throttle device 500; a second throttle device 600; a four-way valve 700; a reservoir 800;

a housing 10;

a compression mechanism 20;

a single stage compression cylinder 21; a single stage compression chamber 210; a single stage suction port 211; a second jet flow path 212; a second air injection passage 213; a second gas jet 2131; a single stage suction line 214; a slide back pressure chamber 215; a back pressure chamber line 217;

a two-stage compression cylinder 22; a first stage compression cylinder 22a; a second stage compression cylinder 22b; a first stage compression chamber 220; a first suction port 221; a second stage compression chamber 230; a mixing chamber 240; a first jet flow path 241; a first jet channel 2411; a discharge chamber 250;

a crankshaft 23; a piston 24; a slide 25; a partition 26; a bearing 27; a cover plate 28; an elastic element 291; a magnetic element 292;

a motor assembly 30; a stator 31; a rotor 32;

a three-way valve 40; a check valve 41; a stopper 42; a screw 43; a solenoid valve 44;

an external jet loop 50.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary for the purpose of illustrating the present invention and are not to be construed as limiting the present invention, and various changes, modifications, substitutions and alterations may be made therein by one of ordinary skill in the art without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

A rotary compressor 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to fig. 1 to 6, a rotary compressor 100 according to an embodiment of the present invention may include: a housing 10, a compression mechanism 20 and a motor assembly 30.

Specifically, the compression mechanism 20 is provided in the casing 10, and the compression mechanism 20 includes a single stage compression cylinder 21 and a two stage compression cylinder 22, the single stage compression cylinder 21 having a single stage compression chamber 210, a single stage suction port 211, and a single stage discharge port, both of which are in communication with the single stage compression chamber 210. The single stage compression cylinder 21 may suck air through the single stage suction port 211 and then be discharged from the single stage discharge port into the inner space of the casing 10 after being compressed in the single stage compression chamber 210.

The two-stage compression cylinder 22 includes a first-stage compression cylinder 22a and a second-stage compression cylinder 22b, the first-stage compression cylinder 22a having a first-stage compression chamber 220 and a first intake port 221, the second-stage compression cylinder 22b having a second-stage compression chamber 230 and a first exhaust port, the two-stage compression cylinder 22 further having a mixing chamber 240 and a first air injection flow path 241, the mixing chamber 240 communicating with the first-stage compression chamber 220 and the second-stage compression chamber 230, the first air injection flow path 241 communicating with the mixing chamber 240. Thus, the first suction port 221, the first stage compression chamber 220, the mixing chamber 240, the second stage compression chamber 230, and the first discharge port may be sequentially communicated. The gas may be sucked through the first suction port 221, compressed in the first stage compression chamber 220, and then flowed to the mixing chamber 240, and at the same time, the mixing chamber 240 may be introduced through the first gas injection flow path 241, and then mixed with the compressed gas, and then flowed to the second stage compression chamber 230, and then again compressed in the second stage compression chamber 230, and then discharged from the first discharge port and introduced into the inner space of the casing 10.

In actual use, the pressure of the gas entering the first suction port 221, the single-stage suction port 211, and the first gas injection flow path 241 may be controlled according to circumstances, for example, the single-stage compression cylinder 21 may suck low-pressure gas from the single-stage suction port 211, the low-pressure gas may be compressed in the single-stage compression chamber 210 to form high-pressure gas, and then may be discharged from the single-stage exhaust port into the housing 10; the two-stage compression cylinder 22 may suck low-pressure gas from the first suction port 221, compress the low-pressure gas in the first-stage compression chamber 220, and then discharge the low-pressure gas into the mixing chamber 240, and simultaneously, may introduce medium-pressure gas into the mixing chamber 240 through the first gas injection flow path 241, mix the medium-pressure gas with the gas compressed by the first-stage compression chamber 220, then enter the second-stage compression chamber 230 to be compressed to form high-pressure gas, and then discharge the high-pressure gas into the internal space of the casing 10 from the first gas discharge port. The specific pressure values of the low pressure, the medium pressure and the high pressure may be specifically set according to the actual rotary compressor.

Thus, the single-stage compression cylinder 21 can realize single-stage compression of the gas, and the two-stage compression cylinder 22 can realize two-stage compression of the gas. Under the conditions such as ultralow temperature low-pressure, the single-stage compression cylinder 21 and the two-stage compression cylinder 22 can work simultaneously, the compressor discharge capacity during ultralow temperature low-pressure can be increased, the two-stage compression under the conditions can have a proper large pressure ratio and a large pressure difference, the discharge capacity can be increased simultaneously, the refrigeration cycle is optimized, and the effects of increasing the capacity and improving the energy efficiency are achieved simultaneously.

The motor assembly 30 may be disposed within the housing 10 and may drive the compression mechanism 20 in operation. The motor assembly 30 may include a stator 31 and a rotor 32, where the crankshaft 23 of the compression mechanism 20 is connected to the rotor 32, the single-stage compression chamber 210, the first-stage compression chamber 220 and the second-stage compression chamber 230 are respectively provided with a piston 24 and a sliding vane 25, the piston 24 is sleeved on the crankshaft 23 to rotate with the crankshaft 23, and the crankshaft 23 can drive the piston 24 to rotate in the corresponding compression chamber and cooperate with the sliding vane 25 under the driving of the rotor 32, so as to compress the gas. The motor assembly 30 and the associated structure with the crankshaft 23 and the piston 24, etc., are well known to those skilled in the art and will not be described in further detail herein.

According to the rotary compressor 100 of the embodiment of the invention, by arranging the single-stage compression cylinder 21 and the two-stage compression cylinder 22 and arranging the mixing cavity 240 which is communicated with the first-stage compression cavity 220 and the second-stage compression cavity 230 in the two-stage compression cylinder 22, the effects of simultaneously considering the operation capacity and the energy efficiency of the compressor can be realized, the refrigeration cycle is optimized, and the rotary compressor is particularly suitable for the working condition of ultralow temperature and low temperature.

Alternatively, the single stage compression chambers 210, the first stage compression chambers 220, and the second stage compression chambers 230 may be arbitrarily arranged in the axial direction of the casing 10 according to some embodiments of the present invention. In other words, the rotary compressor 100 has three compression chambers arranged in the axial direction of the compression mechanism 20, which are in one-to-one correspondence with the single-stage compression chamber 210, the first-stage compression chamber 220, and the second-stage compression chamber 230, respectively, and any one of the three compression chambers may be provided as any one of the single-stage compression chamber 210, the first-stage compression chamber 220, and the second-stage compression chamber 230. The arrangement of the three compression chambers can be flexibly set by a person skilled in the art according to actual requirements.

For example, in the embodiment shown in fig. 1 and 2, the rotary compressor 100 has an upper compression chamber, an intermediate compression chamber, and a lower compression chamber, the upper compression chamber may be a single stage compression chamber 210, the lower compression chamber may be a first stage compression chamber 220, and the intermediate compression chamber may be a second stage compression chamber 230. Thus, the first stage compression chambers 220 and the second stage compression chambers 230 may be positioned adjacent to each other, providing for easier placement and better gas flow properties.

According to some embodiments of the present invention, an exhaust chamber 250 may also be provided within the compression mechanism 20, the exhaust chamber 250 being in communication with the first exhaust port, as shown in fig. 2 and 3. Thus, the high pressure gas compressed in two stages may be introduced into the discharge chamber 250 through the first discharge port and then discharged into the inner space of the casing 10, thereby improving the discharge performance.

In the embodiment of the present invention, the arrangement position of the discharge chamber 250 is not particularly limited, and alternatively, as shown in fig. 1 to 4, in some embodiments of the present invention, the discharge chamber 250 may be defined by two stacked partitions 26 provided between any two of the single stage compression chamber 210, the first stage compression chamber 220, and the second stage compression chamber 230. That is, two partitions 26 may be disposed between any two of the single stage compression chambers 210, the first stage compression chambers 220, and the second stage compression chambers 230, the two partitions 26 may be disposed in a stacked manner, the discharge chamber 250 may be defined by the two stacked partitions 26, the arrangement is more convenient, and the adjustment of the discharge chamber 250 may be achieved by replacing the partition 26.

For example, in the embodiment shown in fig. 2 and 3, one partition 26 may be disposed between the first stage compression chamber 220 and the second stage compression chamber 230, two stacked partitions 26 may be disposed between the single stage compression chamber 210 and the second stage compression chamber 230, and the discharge chamber 250 may be defined by the two partitions 26.

In the embodiment of the present invention, the mixing chamber 240 may be flexibly disposed at a plurality of positions according to the structure, and the present invention is not particularly limited thereto. For example, according to some specific examples of the invention, the mixing chamber 240 may be defined by a stacked baffle 26 disposed between any two of the single stage compression chamber 210, the first stage compression chamber 220, and the second stage compression chamber 230. For another example, the mixing chamber 240 may be defined by the bearing 27 of the compression mechanism 20 and the cover plate 28 provided on the bearing 27, wherein the bearing 27 may be an upper bearing or a lower bearing. As shown in fig. 2 and 3, the mixing chamber 240 is defined by the bearing 27 located at the lower side and the cover plate 28 provided under the bearing 27. In the case of a structure in which the mixing chamber 240 is provided between the two separators 26, a high-pressure chamber may be provided on the bearing 27 located on the lower side as an exhaust chamber, as shown in fig. 4. Alternatively, in the embodiment shown in fig. 4, the cover plate 28 may be removed and the muffler may be provided directly on the bearing 27 on the lower side.

Optionally, a first air injection channel 2411 may be disposed in the two-stage compression cylinder 22, at least a portion of the first air injection channel 241 is formed by the first air injection channel 2411, and a first air injection port of the first air injection channel 241 may be disposed on the first stage compression cylinder 22a, the second stage compression cylinder 22b, the bearing 27, the partition 26 or the cover plate 28, and the position of the first air injection port of the first air injection channel 241 may be flexibly set according to the specific structure of the compression mechanism 20, so that an external structure is more flexibly set, and installation is convenient.

In some embodiments of the present invention, the single stage compression cylinder 21 may be switchable between a cylinder-rest operating condition and a cylinder-de-rest operating condition. Here, the cylinder-rest operation state refers to a state in which the gas is not compressed in the single-stage compression chamber 210, and the cylinder-rest operation state is released, which means that the gas can be compressed in the single-stage compression chamber 210 when the single-stage compression cylinder 21 is normally charged. Thus, the single stage compression cylinder 21 may be formed as a variable volume cylinder, i.e., may or may not be operated.

Thus, under lighter conditions (e.g., when the pressure differential is low), compression may be performed using only two stages of compression cylinders 22 because the need for cold or heat is not so great. The single stage compression cylinder 21 stops compression, avoiding frequent shut down of the compressor or operation at very low frequency, optimizing the refrigeration cycle. Under the heavy-load working condition, the single-stage compression cylinder 21 and the two-stage compression cylinder 22 can work together, so that the requirement of large displacement can be met, the capacity of the compressor is further increased, the running frequency of the compressor is reduced, and the energy efficiency of the compressor is further improved.

In the embodiment of the present invention, the manner of the variable capacity of the single stage compression cylinder 21 is not particularly limited. Alternatively, in some embodiments of the present invention, the single stage compression cylinder 21 may switch between the cylinder-rest operation state and the cylinder-rest release operation state by controlling the magnitude of the suction pressure, and the switching operation is convenient and reliable. For example, in some embodiments of the present invention, the suction pressure of the single stage compression cylinder 21 may be switched between a high pressure and a low pressure, thereby achieving switching between two modes of operation, namely, cylinder rest and cylinder rest release. Specifically, when the suction pressure is high, the suction pressure and the discharge pressure of the single-stage compression cylinder 21 are both high, and the single-stage compression cylinder 21 does not work, so that cylinder rest is realized; when the suction pressure is low, the single stage compression cylinder 21 can work normally, and the cylinder break is released.

Alternatively, a three-way valve 40 may be provided in the single-stage suction line 214 communicating with the single-stage suction port 211, and three ports of the three-way valve 40 communicate with the single-stage suction port 211, the accumulator outlet, and the compressor casing discharge port, respectively, as shown with reference to fig. 1 to 4 and 10. Thus, the three-way valve 40 can be controlled to realize the low-pressure gas or high-pressure gas to be introduced into the single-stage air suction port 211, and the air intake is convenient to control.

In other embodiments of the present invention, the single stage compression cylinder 21 is variable capacity in the form of vane back pressure switching. Specifically, a sliding vane back pressure cavity 215 may be disposed in the single-stage compression cylinder 21, as shown in fig. 3, the pressure of the sliding vane back pressure cavity 215 may be variable, and the switching operation of the single-stage compression cylinder 21 between the cylinder-rest operation state and the cylinder-rest operation state can be achieved by controlling the back pressure of the sliding vane 25, which is convenient and reliable.

For example, in the embodiment shown in fig. 11, a three-way valve 40 may be provided on the back pressure chamber line 217 that communicates with the slide back pressure chamber 215, and three ports of the three-way valve 40 communicate with the slide back pressure chamber 215, the reservoir inlet, and the housing exhaust port, respectively. Thus, the three-way valve 40 can be controlled to realize the low-pressure gas or high-pressure gas to be introduced into the single-stage air suction port 211, and the air intake is convenient to control. When low-pressure gas is introduced, the back pressure and the head pressure of the sliding vane 25 are approximately the same, the sliding vane 25 does not work, the single-stage compression cylinder 21 is in a cylinder-rest state, and when high-pressure gas is introduced, the sliding vane 25 is in a normal working state, and the single-stage compression cylinder 21 releases the cylinder-rest state.

Optionally, the rotary compressor 100 may further include a second gas injection flow path 212, as shown in fig. 5 and 6, and fig. 10 and 11, the second gas injection flow path 212 communicating with the single stage compression chamber 210. Therefore, the single-stage compression cylinder 21 can jet air, the refrigeration cycle of single-stage compression can be further optimized, the single-stage compression capacity is improved, and the low-temperature heating quantity of single-stage compression is improved. It should be noted that, in the embodiment of the present invention, the single stage compression cylinder 21 may be configured to only perform the capacity change without injecting air, may be configured to only perform the capacity change without performing the capacity change, and may be configured to perform the capacity change and the air injection, so as to combine the advantages of the capacity change and the air injection.

A second air injection passage 213 may be provided in the single stage compression cylinder 21, and as shown in fig. 5, the second air injection passage 213 may be provided as a part of the second air injection flow path 212. The second air jet 2131 of the second air jet flow path 212 can be flexibly arranged on the single-stage compression cylinder 21, the bearing 27, the partition 26 or the cover plate 28 to be better adapted to other structures of the compression mechanism 20.

Further, according to some embodiments of the present invention, a check valve 41 may be further disposed on the second gas injection flow path 212, and referring to fig. 6 and 10, the check valve 41 may control the unidirectional delivery of the gas to the single-stage compression chamber 210, that is, the gas on the second gas injection flow path 212 may flow into the single-stage compression chamber 210 through the check valve 41, but the gas in the single-stage compression chamber 210 may not flow outward through the check valve 41. In particular, for the single-stage compression cylinder 21 which can be variable in capacity, the pressure of the single-stage compression chamber 210 is high during cylinder withdrawal, and the check valve 41 is arranged so that high-pressure gas does not flow back from the single-stage compression chamber 210. While the single stage compression cylinder 21 is operating normally, the second gas injection flow path 212 may function normally, and the medium pressure gas may be injected into the single stage compression chamber 210 through the second gas injection flow path 212.

Alternatively, the check valve 41 may be provided inside or outside the compression mechanism 20, and may be flexibly provided according to the actual structure. As shown in fig. 6, the check valve 41 may be disposed on the partition 26, and further, the check valve 41 is formed into a valve plate structure and is fixed with the stopper 42 by a threaded fastener such as a screw 43, and the stopper 42 may limit the lift of the check valve 41, so as to avoid breakage caused by excessive movement of the check valve 41.

In some alternative embodiments of the present invention, the capacity of the single stage compression cylinder 21 is switched by sliding vane back pressure, and the electromagnetic valve 44 may be disposed on the second air injection flow path 212, as shown in fig. 11, and the electromagnetic valve 44 may control the on-off of the second air injection flow path 212. Thus, the second air injection passage 212 can be blocked reversely, and the electromagnetic valve 44 can keep the second air injection passage 212 in a disconnected state when the single-stage compression cylinder 21 is in a cylinder-rest state, so that the bidirectional flow of the gas can be avoided, and the control performance is better.

Referring to fig. 9 to 11, according to some embodiments of the present invention, the rotary compressor 100 may further include: the external air injection circuit 50 provided outside the cabinet 10, the second air injection flow path 212 and the first air injection flow path 241 are both communicated with the same external air injection circuit 50. Therefore, a circuit can be shared outside the casing 10, and branches are arranged inside the compression mechanism 20, so that the external structure is simplified, the installation is convenient, and meanwhile, some cost can be saved.

Alternatively, the vane 25 within the single stage compression chamber 210 may be configured to be positioned to be controlled by adjusting the pressure of the vane back pressure chamber 215. That is, the slide 25 in the single stage compression chamber 210 is no longer position-controlled by the elastic member 291, but is also achieved by adjusting the pressure of the gas. Therefore, not only the elements can be saved and the production cost of the compressor can be reduced, but also when the single-stage compression cylinder 21 is depressurized, the sliding vane 25 can not prop against the piston 24 without the action of the elastic element 291 such as a spring, so that the friction between the head of the sliding vane 25 and the piston 24 can be avoided, and the abrasion and the power can be reduced. For example, as shown in fig. 3, a suction port communicating with the vane back pressure chamber 215 may be provided on the single stage compression cylinder 21, and the pressure of the vane back pressure chamber 215 may be controlled by controlling the air inlet and outlet condition of the suction port, so as to realize the adjustment of the position of the vane 25, which is convenient and reliable to control.

As shown in fig. 3, the sliding vane 25 in the first stage compression chamber 220 and the second stage compression chamber 230 can still adopt the elastic element 291 for position control, and the sliding vane 25 is reliably connected and has flexible adjustment position.

According to some embodiments of the present invention, the compression mechanism 20 may be provided with a magnetic element 292, as shown in fig. 3, the magnetic element 292 may interact with the slide 25 in the single stage compression chamber 210 to brake the slide 25 when the single stage compression cylinder 21 is in the cylinder-rest operation state. Therefore, the slide vane 25 can be more stably kept in the slide vane groove when the single-stage compression cylinder 21 is in a cylinder-rest state, and the slide vane 25 is prevented from colliding with the piston 24 or the cylinder due to movement caused by internal air pressure fluctuation, so that parts are damaged, and the reliability of the rotary compressor 100 is improved.

Assuming that the working displacement of the single stage compression cylinder 21 is V1, the working displacement of the second stage compression cylinder 22b is V2, and the working displacement of the first stage compression cylinder 22a is V3, as shown in fig. 7, in order to maintain a high energy efficiency, the ratio of V2/v3=0.55 to 0.95, that is, the ratio of V2 to V3 may be in the range of 0.55 to 0.95 (including two end points). For example, in some specific examples of the present invention, the V2/V3 values are 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, etc., respectively. As shown in fig. 8, in order to maintain high energy efficiency, V1/v3=0.35-1.8, i.e., the ratio of V1 to V3 can be in the range of 0.35-1.8 (including both end points). For example, in some embodiments of the present invention, V1/V3 has a value of 0.55, 0.75, 0.95, 1.15, 1.35, 1.55, etc., respectively.

Aiming at different areas and using conditions, different energy efficiency is brought by different future V2/V3 and V1/V3, and when the temperature difference between evaporation and condensation is large (such as a heat pump working condition), V2/V3 can be set to be a smaller value; when the temperature difference is smaller, a larger value can be taken, and V1/V3 is opposite to V2/V3, so that the energy efficiency of the compressor can be improved according to different areas and different using conditions.

As shown in fig. 9 to 11, an air conditioning system 1000 according to an embodiment of the present invention includes a rotary compressor 100 according to an embodiment of the present invention. Since the rotary compressor according to the embodiment of the present invention has the above advantageous technical effects, the air conditioning system 1000 according to the embodiment of the present invention can be compatible with both capacity and energy efficiency, especially in low temperature and low-system situations.

Referring to fig. 9 to 11, the air conditioning system 1000 may include: the condenser 200, the flash evaporator 300, the evaporator 400, the first throttling device 500, the second throttling device 600, the four-way valve 700, the accumulator 800, etc., which may be connected with the rotary compressor 100 to form a compression system circuit, the connection structure, etc., will be understood by those skilled in the art, and will not be described in detail herein.

The air conditioning system 1000 according to the embodiment of the present invention may be applied to a refrigerating apparatus, and other configurations and operations of the air conditioning system 1000 will be known to those skilled in the art, and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, a description referring to the terms "embodiment," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples without interference or conflict.

Claims

1. A rotary compressor, comprising:

a housing;

the compression mechanism is arranged in the shell and comprises a single-stage compression cylinder and a two-stage compression cylinder, the single-stage compression cylinder is provided with a single-stage compression cavity, a single-stage air suction port and a single-stage exhaust port, the two-stage compression cylinder comprises a first-stage compression cylinder and a second-stage compression cylinder, the first-stage compression cylinder is provided with a first-stage compression cavity and a first air suction port, the second-stage compression cylinder is provided with a second-stage compression cavity and a first exhaust port, and the compression mechanism is provided with a mixing cavity communicated with the first-stage compression cavity and the second-stage compression cavity and a first air injection flow path communicated with the mixing cavity;

the motor component is arranged in the shell and is suitable for driving the compression mechanism to work;

the single-stage compression cylinder is switchable between a cylinder-rest operation state and a cylinder-rest release operation state;

a second jet flow path in communication with the single stage compression chamber;

the second jet flow path is provided with a one-way valve for controlling the one-way delivery of gas to the single-stage compression chamber, and the one-way valve is arranged inside or outside the compression mechanism.

2. The rotary compressor of claim 1, wherein the single stage compression chambers, the first stage compression chambers, and the second stage compression chambers are arranged arbitrarily along an axial direction of the compression mechanism.

3. The rotary compressor of claim 1, wherein a discharge chamber in communication with the first discharge port of the second stage compression cylinder is further provided within the compression mechanism.

4. A rotary compressor according to claim 3, wherein the discharge chamber is defined by two stacked diaphragms disposed between any two of the single stage compression chamber, first stage compression chamber and second stage compression chamber.

5. The rotary compressor of claim 1, wherein the mixing chamber is defined by two stacked diaphragms disposed between any two of the single stage compression chamber, the first stage compression chamber, and the second stage compression chamber, or the mixing chamber is defined by a bearing of the compression mechanism and a cover plate disposed on the bearing.

6. The rotary compressor of claim 1, wherein the single stage compression cylinder is switched between a cylinder-rest operation state and a cylinder-release operation state by controlling the magnitude of suction pressure.

7. The rotary compressor of claim 1, wherein a pressure-variable vane back pressure chamber is provided in the single-stage compression cylinder to realize switching of the single-stage compression cylinder between a cylinder-rest operation state and a cylinder-rest release operation state by controlling a back pressure of a vane.

8. The rotary compressor of claim 6 or 7, further comprising:

the second jet flow path is communicated with the single-stage compression cavity, and an electromagnetic valve for controlling on-off of the second jet flow path is arranged on the second jet flow path.

9. The rotary compressor of claim 1, wherein the first gas injection port of the first gas injection flow path is provided on the first stage compression cylinder, the second stage compression cylinder, a bearing, a partition plate, or a cover plate.

10. The rotary compressor of claim 1, wherein the second gas injection port of the second gas injection flow path is provided on a single stage compression cylinder, bearing, baffle, or cover plate.

11. The rotary compressor of claim 1, wherein the first and second air injection flow paths communicate with a same external air injection circuit located outside the casing.

12. The rotary compressor of claim 1, wherein the vane within the single stage compression chamber is configured to be controlled in position by adjusting the pressure of the vane back pressure chamber.

13. The rotary compressor of claim 1, wherein the compression mechanism is provided with a magnetic element that acts on a slide in the single stage compression chamber to brake the slide when the single stage compression cylinder is in a cylinder-rest operating state.

14. The rotary compressor of claim 1, wherein the single stage compression cylinder has a working displacement V1 and the first stage compression cylinder has a working displacement V3, wherein V1/v3 = 0.35-1.8.

15. The rotary compressor of claim 1, wherein the working displacement of the second stage compression cylinder is V2 and the working displacement of the first stage compression cylinder is V3, wherein V2/v3 = 0.55-0.95.

16. An air conditioning system comprising a rotary compressor according to any one of claims 1-15.