Compressor and air-conditioning unit

Abstract

A compressor and an air-conditioning unit. The compressor comprises: a housing; a low-pressure-stage compression assembly, the low-pressure-stage compression assembly being arranged in the housing and connected to a power mechanism; and a high-pressure-stage compression assembly, the high-pressure-stage compression assembly being connected to the low-pressure-stage compression assembly by means of a clutch mechanism. In the compressor and the air-conditioning unit, by means of providing the clutch mechanism between the low-pressure-stage compression assembly and the high-pressure-stage compression assembly, the high-pressure-stage compression assembly stops operating, and the low-pressure-stage compression assembly keeps operating to perform first-stage compression on a gas, thereby realizing a low-compression-ratio output; and at this time, no gas flow is present in the high-pressure-stage compression assembly, thus reducing energy consumption of a gas flow pumping process and mechanical friction, effectively avoiding the problem in the prior art of high energy consumption caused by two pairs of rotors in the compressor always being in a rotating state, and improving the operating efficiency of the compressor.

Description

Compressors and air conditioning units

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202311574204.1 and invention name “Compressor and Air Conditioning Unit,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the technical field of compression equipment, and in particular to a compressor and an air-conditioning unit. Background Art

[0003] A single-unit, two-stage compressor features two pairs of rotors connected in series within a single housing. The compressed gas is drawn in, compressed, and exhausted by the first-stage (low-pressure) rotor pair, and then drawn in, compressed, and exhausted by the second-stage (high-pressure) rotor pair, completing a two-stage compression process known as two-stage compression. This series-relay compression process can meet the requirements of high-pressure ratio operating conditions. The industry typically utilizes single-unit, two-stage compressors, adding logic controls within the compressor or system to switch between single- and two-stage compression to meet the requirements of varying pressure ratios.

[0004] However, in the single-stage and two-stage compressors in the related art, in order to ensure that a single-machine two-stage compressor can perform two-stage compression, both pairs of rotors are connected to the motor, and then the gas source of the high-pressure stage rotor pair is controlled to be adjusted. For example, the exhaust gas of the low-pressure stage rotor pair can be directly discharged without flowing through the high-pressure stage rotor pair to achieve single-stage compression. However, in this process, although the high-pressure stage rotor pair does not compress the gas to do work, it is always in a rotating state, and there is still an airflow pumping process and mechanical friction inside it, which will consume the power of the compressor and cause the problem of increased energy consumption of the compressor.

[0005] Summary of the Invention

[0006] In order to solve the technical problem of high energy consumption of compressors in related technologies, a compressor and an air-conditioning unit are provided which utilize a clutch mechanism to stop the high-pressure stage compression assembly from working and rotating to reduce energy consumption.

[0007] A compressor comprising:

[0008] case;

[0009] a low-pressure stage compression assembly, the low-pressure stage compression assembly being disposed in the housing and connected to the power mechanism;

[0010] a high-pressure stage compression assembly, the high-pressure stage compression assembly being connected to the low-pressure stage compression assembly via a clutch mechanism;

[0011] The compressor has a single-stage compression mode and a two-stage compression mode;

[0012] When the compressor is in a single-stage compression mode, the clutch mechanism is switched to a disconnected state;

[0013] When the compressor is in a two-stage compression mode, the clutch mechanism is switched to an engaged state.

[0014] In some embodiments, the clutch mechanism includes two engaging structures, one engaging structure is arranged on the low-pressure stage compression assembly, and the other engaging structure is arranged on the high-pressure stage compression assembly, and when the clutch mechanism is in a disconnected state, the two engaging structures are disengaged from each other, and when the clutch mechanism is in an engaged state, the two engaging structures are connected to each other.

[0015] In some embodiments, the compressor further includes a driving mechanism, wherein the driving mechanism is connected to the clutch mechanism, and the driving mechanism is capable of driving the clutch mechanism to switch between the disconnected state and the engaged state.

[0016] In some embodiments, a pressure channel is provided on the high-pressure stage compression assembly, one of the coupling structures is movably disposed in the pressure channel, and the coupling structure can protrude from the pressure channel to connect with another coupling structure.

[0017] In some embodiments, the pressure channel has a first connecting port and a second connecting port relative to each other, the coupling structure is located between the first connecting port and the second connecting port, and the first connecting port is directly or indirectly connected to the condenser in the refrigerant heat exchange cycle where the compressor is located, and the second connecting port is connected to the exhaust of the low-pressure stage compression assembly.

[0018] In some embodiments, a portion of the pressure channel close to the low-pressure stage compression assembly forms a cylinder, the engaging structure is movably disposed in the cylinder, and a cross-sectional area of ​​the cylinder is larger than a cross-sectional area of ​​the pressure channel.

[0019] In some embodiments, the low-pressure stage compression assembly includes a low-pressure stage driving rotor, the high-pressure stage compression assembly includes a high-pressure stage driving rotor, one of the engagement structures is provided on the low-pressure stage driving rotor, and the other engagement structure is provided on the high-pressure stage driving rotor.

[0020] In some embodiments, the central axis of the low-pressure stage driving rotor and the central axis of the high-pressure stage driving rotor are collinear, and there is a distance between the two driving rotors, and both of the engagement structures are located within the distance.

[0021] In some embodiments, the two coupling structures include a high-pressure stage coupling structure and a low-pressure stage coupling structure, the gap is formed between the first end of the low-pressure stage active rotor and the second end of the high-pressure stage active rotor, the high-pressure stage coupling structure can protrude from the high-pressure stage active rotor through the second end of the high-pressure stage active rotor, and the low-pressure stage coupling structure is arranged on the first end of the low-pressure stage active rotor.

[0022] In some embodiments, a connecting groove is provided on the first end of the low-pressure stage active rotor, the connecting groove constitutes the low-pressure stage joint structure, and a connecting protrusion is provided on the high-pressure stage joint structure, and the connecting protrusion can be snap-fitted with the connecting groove; or, a connecting protrusion is provided on the first end of the low-pressure stage active rotor, the connecting protrusion constitutes the low-pressure stage joint structure, and a connecting groove is provided on the high-pressure stage joint structure, and the connecting groove can be snap-fitted with the connecting protrusion.

[0023] In some embodiments, a low-pressure exhaust port, a high-pressure exhaust port and an air intake port are provided on the shell, and the air intake port and the low-pressure exhaust port are both connected to the low-pressure stage compression assembly, and the high-pressure exhaust port is connected to the high-pressure stage compression assembly.

[0024] An air conditioning unit comprises the above-mentioned compressor.

[0025] The compressor and air-conditioning unit provided by the present invention provide a clutch mechanism between the low-pressure stage compression assembly and the high-pressure stage compression assembly. When the compressor requires a high-pressure ratio output, the clutch mechanism switches to an engaged state, so that both the low-pressure stage compression assembly and the high-pressure stage compression assembly work, thereby being able to perform secondary compression on the gas to achieve a high-pressure ratio output. When the compressor requires a low-pressure ratio output, the clutch mechanism switches to a disconnected state to disconnect the power source of the high-pressure stage compression assembly, so that the high-pressure stage compression assembly stops working, while the low-pressure stage compression assembly keeps working to perform primary compression on the gas to achieve a low-pressure ratio output. At this time, there is no gas flow inside the high-pressure stage compression assembly, thereby reducing the energy consumption of the airflow pumping process and mechanical friction, effectively avoiding the problem of high energy consumption caused by the two pairs of rotors in the compressor in the related art being always in a rotating state, and improving the working efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a cross-sectional view of a compressor provided by an embodiment of the present disclosure;

[0027] FIG2 is another cross-sectional view of a compressor provided by an embodiment of the present disclosure;

[0028] FIG3 is a partial cross-sectional view of a high-pressure stage compression assembly provided by an embodiment of the present disclosure;

[0029] FIG4 is a cross-sectional view of the clutch mechanism of the compressor provided by the embodiment of the present disclosure when it is in a disconnected state;

[0030] FIG5 is a cross-sectional view of the clutch mechanism of the compressor provided by the embodiment of the present disclosure when in an engaged state;

[0031] FIG6 is a cross-sectional view of a high-pressure stage active rotor provided by an embodiment of the present disclosure;

[0032] 7 is a cross-sectional view of the second end of the high-pressure stage active rotor and the high-pressure stage joint structure provided by an embodiment of the present disclosure;

[0033] FIG8 is a cross-sectional view of a low-pressure stage active rotor provided by an embodiment of the present disclosure;

[0034] FIG9 is a cross-sectional view of the first end of the low-pressure stage active rotor and the low-pressure stage joint structure provided by an embodiment of the present disclosure;

[0035] In the picture:

[0036] 1. Housing; 2. Low-pressure stage compression assembly; 3. High-pressure stage compression assembly; 41. Pressure channel; 42. First connecting port; 43. Second connecting port; 44. Cylinder; 21. Low-pressure stage active rotor; 31. High-pressure stage active rotor; 51. Connecting groove; 52. High-pressure stage joint structure; 53. Connecting protrusion. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

[0038] In order to enable those skilled in the art to better understand the solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.

[0039] It should be noted that the terms "first," "second," and the like in the specification and claims of the present disclosure and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate for the embodiments of the present disclosure described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0040] It should be noted that, in the description of this disclosure, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, it should be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0042] In the single-stage and two-stage compressors in the related art, in order to ensure that a single-machine two-stage compressor can perform two-stage compression, both pairs of rotors are connected to the motor, and then the gas source of the high-pressure stage rotor pair is controlled to make adjustments. For example, the exhaust gas of the low-pressure stage rotor pair can be discharged directly without flowing through the high-pressure stage rotor pair to achieve single-stage compression. However, in this process, although the high-pressure stage rotor pair does not compress the gas to do work, it is always in a rotating state, and there is still an airflow pumping process and mechanical friction inside it, which will consume the power of the compressor and cause the problem of increased energy consumption of the compressor. In the related art, a valve block with external logic control is generally used, and the movement of the valve block in the corresponding position is used to achieve high-pressure compression. The inlet state of the high-pressure stage rotor pair is adjusted. When the high-pressure stage rotor pair is needed to work, the valve block moves to the first position. At this time, the exhaust gas of the low-pressure stage rotor pair can enter the high-pressure stage rotor pair for secondary compression, thereby realizing the high-pressure ratio output of the compressor. When the high-pressure stage rotor pair is not needed to work, the valve block moves to the second position. At this time, the inlet of the high-pressure stage rotor pair is closed by the valve block, and the exhaust gas of the low-pressure stage rotor pair is directly discharged, thereby realizing the low-pressure ratio output of the compressor. At this time, the high-pressure stage rotor pair is still directly or indirectly connected to the power source (such as the output shaft of the motor), that is, the high-pressure stage rotor pair is always in a rotating state, and there is still an airflow pumping process and mechanical friction inside it, which will consume the power of the compressor and cause the energy consumption of the compressor to increase. To this end, the present disclosure provides a compressor as shown in Figures 1 to 9, comprising: a shell 1; a low-pressure stage compression assembly 2, wherein the low-pressure stage compression assembly 2 is arranged in the shell 1 and the low-pressure stage compression assembly 2 is connected to a power mechanism; a high-pressure stage compression assembly 3, wherein the high-pressure stage compression assembly 3 is connected to the low-pressure stage compression assembly 2 via a clutch mechanism; the compressor has a single-stage compression mode and a two-stage compression mode; when the compressor is in the single-stage compression mode, the clutch mechanism is switched to a disconnected state; when the compressor is in the two-stage compression mode, the clutch mechanism is switched to an engaged state. By setting a clutch mechanism between the low-pressure stage compression component 2 and the high-pressure stage compression component 3, when the compressor needs a high-pressure ratio output, the clutch mechanism switches to the engaged state, so that both the low-pressure stage compression component 2 and the high-pressure stage compression component 3 work, thereby being able to perform secondary compression on the gas to achieve a high-pressure ratio output. When the compressor needs a low-pressure ratio output, the clutch mechanism switches to the disconnected state to disconnect the power source of the high-pressure stage compression component 3, so that the high-pressure stage compression component 3 stops working, while the low-pressure stage compression component 2 keeps working to perform primary compression on the gas to achieve a low-pressure ratio output. At this time, there is no gas flow inside the high-pressure stage compression component 3, thereby reducing the energy consumption of the airflow pumping process and mechanical friction, effectively avoiding the problem of high energy consumption caused by the two pairs of rotors in the compressor in the related technology being always in a rotating state, thereby improving the working efficiency of the compressor.The clutch mechanism includes two engagement structures, one of which is provided on the low-pressure stage compression assembly 2 and the other is provided on the high-pressure stage compression assembly 3. When the clutch mechanism is in the disconnected state, the two engagement structures are disengaged from each other, and when the clutch mechanism is in the engaged state, the two engagement structures are connected to each other. When the clutch mechanism is in the disconnected state, the two engagement structures are disengaged from each other, and one engagement structure is away from the other engagement structure, so that there is a certain distance between the two engagement structures. This distance is used to isolate the power from the low-pressure stage compression assembly 2, so that the high-pressure stage compression assembly 3 stops working. When the clutch mechanism is in the engaged state, the two engagement structures are connected to each other, the two engagement structures approach each other, and finally connected to each other, ensuring that power can be transmitted through the two engagement structures, so that the power transmission between the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2 is reliable. The power mechanism can transmit power to the high-pressure stage compression assembly 3 through the low-pressure stage compression assembly 2 and the two engagement structures, ensuring the reliable switching of the compressor between single-stage compression and two-stage compression. Among them, the power mechanism can be a motor structure inside the shell 1, or it can be an external motor structure arranged outside the shell 1 and inserted into the shell 1 through an output shaft and connected to the low-pressure stage compression component.

[0043] To achieve reliable switching of the clutch mechanism's state, the compressor further includes a drive mechanism, which is connected to the clutch mechanism and can drive the clutch mechanism to switch between the disconnected state and the engaged state. The drive mechanism can control the clutch mechanism to operate as needed, thereby controlling the compressor to perform single-stage compression or two-stage compression. During single-stage compression, since the clutch mechanism is in the disconnected state, no power is transmitted between the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2, and the disconnected compression assembly stops operating. When switching from single-stage compression to two-stage compression, the drive mechanism controls the clutch mechanism to operate, engaging the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2 together, allowing power to be transmitted to both the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2. The above process can achieve the switching of the compressor between single-stage compression and two-stage compression. In one embodiment, the high-pressure stage compression assembly 3 is provided with a pressure channel 41, and one of the engagement structures is movably disposed within the pressure channel 41, and the engagement structure can protrude from the pressure channel 41 to connect with another engagement structure. The pressure channel 41 is used to provide a pressure medium for the joint structure, and the pressure medium is used to push the joint structure to move, thereby achieving connection or disconnection between the two joint structures.

[0044] The compressor suction pressure is entirely dependent on and equal to the evaporation pressure of the air conditioning unit in which the compressor is located. The compressor discharge pressure, on the other hand, depends on the compressor suction pressure and compression ratio, requiring different compression ratios to adapt to the unit's condensing pressure. When the compressor is located within the air conditioning unit, the unit first determines the evaporation and condensing pressures based on real-time operating conditions. In some embodiments, the compressor suction and discharge pressures are calculated using a set of evaporation and condensing temperatures to ensure efficient operation. The suction and discharge pressure adjustment range of a single-stage compressor is limited. The total high-pressure to low-pressure ratio of a two-stage series compressor is the product of two single-stage pressure ratios. Therefore, when the air conditioning unit's evaporation and condensing pressure ratio is high, a higher compressor pressure ratio is required to adapt. In this case, two-stage compression meets this requirement. However, when the air conditioning unit's evaporation and condensing pressure ratio is low, the discharge pressure of the two-stage compressor will be significantly higher than the condensing pressure, given a constant evaporation and suction pressures. However, the discharge pressure of the low-pressure stage compression assembly 2 is more suitable for the current condensing pressure. To ensure the compressor can automatically adjust according to the pressure ratio of the air conditioning unit, the pressure channel 41 has a first connecting port 42 and a second connecting port 43 facing each other. The coupling structure is located between the first connecting port 42 and the second connecting port 43. The first connecting port 42 is directly or indirectly connected to the condenser in the refrigerant heat exchange cycle in which the compressor is located, and the second connecting port 43 is connected to the exhaust of the low-pressure stage compression assembly 2. The condensing pressure in the air conditioning unit in which the compressor is located is connected to the pressure channel 41, so that the first side of the coupling structure is the condensing pressure of the air conditioning unit, and the other side is connected to the exhaust of the low-pressure stage compression assembly 2 through the second connecting port 43 to obtain the exhaust pressure of the low-pressure stage compression assembly 2. When the condensing pressure of the air conditioning unit is greater than the exhaust pressure of the low-pressure stage compression assembly 2, the coupling structure is pushed toward the other coupling structure, and the clutch mechanism is finally switched to the engaged state, thereby enabling the high-pressure stage compression assembly 3 to obtain power and begin operation, achieving two-stage compression of the gas, so that the exhaust pressure of the compressor can match the condensing pressure of the air conditioning unit, thereby ensuring the operating efficiency of the compressor and the air conditioning unit. When the condensing pressure of the air-conditioning unit is not greater than that of the low-pressure stage compression component 2, the coupling structure will be pushed away from the other coupling structure, thereby disconnecting the two coupling structures and switching the clutch mechanism to the disconnected state. The high-pressure stage compression component 3 cannot obtain power and stops working, and only the low-pressure stage compression component 2 performs the first-level compression on the gas, so that the exhaust pressure of the compressor can match the condensing pressure of the air-conditioning unit, thereby ensuring the working efficiency of the compressor and the air-conditioning unit.

[0045] In order to ensure that the joint structure in the pressure channel 41 does not frequently disconnect from another joint structure, the portion of the pressure channel 41 close to the low-pressure stage compression assembly 2 forms a cylinder 44, and the joint structure is movably arranged in the cylinder 44, and the cross-sectional area of ​​the cylinder 44 is larger than the cross-sectional area of ​​the pressure channel 41, wherein the cross-sectional area of ​​the joint structure is equal to the cross-sectional area of ​​the cylinder 44, thereby ensuring a reliable seal between the joint structure and the cylinder 44. Since the cross-sectional area of ​​the cylinder 44 is larger than the cross-sectional area of ​​the pressure channel 41, when the joint structure is squeezed by the exhaust pressure of the low-pressure stage compression assembly 2 and fits against the bottom surface of the cylinder 44, the effective area of ​​the pressure in the pressure channel 41 on the joint structure is only the cross-sectional area of ​​the pressure channel 41, while the exhaust gas of the low-pressure stage compression assembly 2 can flow into the cylinder 44. The effective area of ​​the exhaust pressure of the low-pressure stage compression assembly 2 on the joint structure is the cross-sectional area of ​​the cylinder 44. When the pressure in the pressure channel 41 fluctuates, due to the different sizes of the effective areas, the joint structure will not move due to the pressure fluctuation, thereby avoiding the joint structure from constantly connecting with another joint structure. The disengagement and engagement of the joint structure causes the compression ratio of the compressor to switch frequently. Furthermore, at the moment of engagement, the torque on the power mechanism and the connection between the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2 suddenly increases. If the high-pressure stage compression assembly 3 is constantly engaged and disengaged with the low-pressure stage compression assembly 2, damage to the power mechanism and the high-pressure stage compression assembly 3 and the low-pressure stage compression assembly 2 will occur, seriously affecting the reliability of the compressor. Therefore, by making the cross-sectional area of ​​the cylinder 44 larger than the cross-sectional area of ​​the pressure channel 41, the joint structure can withstand certain pressure fluctuations, thereby ensuring the reliability of the compressor. When the pressure in the pressure channel 41 exceeds the exhaust pressure of the low-pressure stage compression assembly 2, the joint structure is squeezed into the opening of the cylinder 44. At this time, the pressurized gas in the pressure channel 41 flows into the cylinder 44. The pressure in the pressure channel 41 acts on the joint structure over an area equal to the cross-sectional area of ​​the cylinder 44, thereby increasing the squeezing capacity of the joint structure and preventing the pressure fluctuations in the pressure channel 41 from affecting the joint structure, thus ensuring the reliability of the compressor. Only when the pressure in pressure channel 41 rises to a certain level can the coupling structure engage with another coupling structure, thereby starting the high-pressure stage compression assembly 3. Similarly, only when the pressure in pressure channel 41 drops to a certain level can the coupling structure disengage from another coupling structure, thereby disconnecting the high-pressure stage compression assembly 3. This prevents frequent starting and stopping of the high-pressure stage compression assembly 3 and ensures stable operation of the compressor. In some embodiments, the cross-sectional area of ​​cylinder 44 is 1.05 to 1.2 times the cross-sectional area of ​​pressure channel 41.When the cross-sectional area of ​​the cylinder 44 is too large, it will occupy too much of the internal space of the compressor (especially the high-pressure stage compression assembly 3), affecting the efficiency of the compressor. When the cross-sectional area of ​​the cylinder 44 is too small, the effect of offsetting the pressure fluctuations in the pressure channel 41 is weak, and the reliability of the compressor cannot be guaranteed.

[0046] As an embodiment, the low-pressure stage compression assembly 2 includes a low-pressure stage active rotor 21, and the high-pressure stage compression assembly 3 includes a high-pressure stage active rotor 31, that is, the low-pressure stage compression assembly 2 and the high-pressure stage compression assembly 3 are both rotor pair structures, and the active rotor receives power and drives the passive rotor to rotate together, thereby achieving gas compression. Among them, one of the coupling structures is arranged on the low-pressure stage active rotor 21, and the other coupling structure is arranged on the high-pressure stage active rotor 31, so that the power of the power mechanism can be smoothly transmitted to the high-pressure stage active rotor 31, ensuring the reliable operation of the high-pressure stage compression assembly 3. Among them, the central axis of the low-pressure stage active rotor 21 and the central axis of the high-pressure stage active rotor 31 are collinear, and there is a distance between the two active rotors, and the two coupling structures are both located within the distance. The two coupling structures only need to move along the axial direction of the central axis of the low-pressure stage active rotor 21 to ensure the reliable coupling of the two coupling structures. Specifically, the two engagement structures include a high-pressure-stage engagement structure 52 and a low-pressure-stage engagement structure. A gap is formed between the first end of the low-pressure-stage active rotor 21 and the second end of the high-pressure-stage active rotor 31. The pressure channel 41 is formed on the high-pressure-stage active rotor 31, and the cylinder 44 is formed at the second end of the high-pressure-stage active rotor 31. The high-pressure-stage engagement structure 52 can protrude from the high-pressure-stage active rotor 31 through the second end of the high-pressure-stage active rotor 31, while the low-pressure-stage engagement structure is disposed on the first end of the low-pressure-stage active rotor 21. In this case, only the high-pressure-stage engagement structure 52 needs to move along the central axis of the high-pressure-stage active rotor 31, reducing the number of moving parts in the clutch mechanism and thereby improving the structural reliability of the clutch mechanism.

[0047] To further reduce the structural complexity of the clutch mechanism, a connecting groove 51 is provided on the first end of the low-pressure stage active rotor 21. The connecting groove 51 constitutes the low-pressure stage engagement structure. A connecting protrusion 53 is provided on the high-pressure stage engagement structure 52. The connecting protrusion 53 engages with the connecting groove 51. When the clutch mechanism switches from a disconnected state to an engaged state, the connecting protrusion 53 on the high-pressure stage engagement structure 52 simply extends into the corresponding connecting groove 51. In some embodiments, the connecting protrusions 53 are arranged in a ring shape around the central axis of the high-pressure stage active rotor 31, and the connecting grooves 51 are arranged in a ring shape around the central axis of the high-pressure stage active rotor 31. In this manner, regardless of the rotation position of the low-pressure stage active rotor 21, the connecting protrusion 53 can connect to the nearest connecting groove 51, thereby improving the clutch mechanism's response speed and engagement reliability. When the clutch mechanism switches to a disconnected state, the high-pressure stage engagement structure 52 simply moves away from the low-pressure stage engagement structure, allowing the connecting protrusion 53 to disengage from the connecting groove 51. As shown in the figure, a flat-top wedge is formed on the high-pressure stage engagement structure 52, and a pointed-top groove is provided on the first end of the low-pressure stage active rotor 21. When the flat-top wedge contacts the first end of the low-pressure stage active rotor 21 but does not enter the pointed-top groove, the flat surface of the flat-top wedge rubs against the first end surface of the low-pressure stage active rotor 21, forming surface-to-surface friction, thereby avoiding damage to the low-pressure stage active rotor 21 and improving the reliability of the compressor.

[0048] Alternatively, a connecting protrusion 53 is provided on the first end of the low-pressure stage active rotor 21. The connecting protrusion 53 constitutes the low-pressure stage engagement structure. The high-pressure stage engagement structure 52 is provided with a connecting groove 51. The connecting groove 51 can engage with the connecting protrusion 53. When the clutch mechanism switches from a disconnected state to an engaged state, the connecting protrusion 53 on the low-pressure stage active rotor 21 can be inserted into the corresponding connecting groove 51. In some embodiments, the connecting protrusions 53 are arranged in an annular shape around the central axis of the high-pressure stage active rotor 31, and the connecting grooves 51 are arranged in an annular shape around the central axis of the high-pressure stage active rotor 31. In this case, regardless of the rotation position of the low-pressure stage active rotor 21, the connecting protrusion 53 can be connected to the nearest connecting groove 51, thereby improving the response speed and engagement reliability of the clutch mechanism.

[0049] The shell 1 is provided with a low-pressure exhaust port, a high-pressure exhaust port and an air intake port. The air intake port and the low-pressure exhaust port are both connected to the low-pressure stage compression assembly 2, and the high-pressure exhaust port is connected to the high-pressure stage compression assembly 3. When the compressor is working, gas is sucked in through the air intake port and directly sent to the low-pressure stage compression assembly 2 for compression, and then sent to the shell 1 where the low-pressure exhaust port is located. When the low-pressure exhaust port is closed, the exhaust gas of the low-pressure stage compression assembly 2 will flow into the high-pressure stage compression assembly 3 for secondary compression and finally be discharged through the high-pressure exhaust port. At this time, the compressor outputs a higher pressure ratio. When the low-pressure exhaust port is opened, the high-pressure stage compression assembly 3 is disconnected from the low-pressure stage compression assembly 2, and the exhaust gas of the low-pressure stage compression assembly 2 is directly discharged through the low-pressure exhaust port. At this time, the compressor outputs a lower pressure ratio. In some embodiments, the low-pressure exhaust port and the high-pressure exhaust port are connected to the same exhaust pipe, so that the compressor can output exhaust gas through the same exhaust pipe in single-stage compression or double-stage compression without switching the exhaust pipeline.

[0050] An air conditioning unit comprises the above-mentioned compressor.

[0051] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A compressor, comprising: Housing (1); A low-pressure compression assembly (2), wherein the low-pressure compression assembly (2) is arranged in the housing (1), and the low-pressure compression assembly (2) is connected to a power mechanism; A high-pressure compression assembly (3), wherein the high-pressure compression assembly (3) is connected to the low-pressure compression assembly (2) via a clutch mechanism; The compressor has a single-stage compression mode and a two-stage compression mode; When the compressor is in a single-stage compression mode, the clutch mechanism is switched to a disconnected state; When the compressor is in the two-stage compression mode, the clutch mechanism is switched to the engaged state.

2. The compressor according to claim 1, wherein: The clutch mechanism comprises two engaging structures, one of which is arranged on the low-pressure stage compression assembly (2), and the other of which is arranged on the high-pressure stage compression assembly (3), and when the clutch mechanism is in a disconnected state, the two engaging structures are disengaged from each other, and when the clutch mechanism is in an engaged state, the two engaging structures are connected to each other.

3. The compressor according to claim 2, wherein: The compressor further comprises a driving mechanism, which is connected to the clutch mechanism and can drive the clutch mechanism to switch between the disconnected state and the engaged state.

4. The compressor according to claim 3, wherein: The high-pressure stage compression assembly (3) is provided with a pressure channel (41), one of the coupling structures is movably arranged in the pressure channel (41), and the coupling structure can protrude from the pressure channel (41) to be interconnected with another coupling structure.

5. The compressor according to claim 4, wherein: The pressure channel (41) has a first connecting port (42) and a second connecting port (43) relative to each other, the joint structure is located between the first connecting port (42) and the second connecting port (43), and the first connecting port (42) is directly or indirectly connected to a condenser in a refrigerant heat exchange cycle where the compressor is located, and the second connecting port (43) is connected to the exhaust of the low-pressure stage compression component (2).

6. The compressor according to claim 4, wherein: The portion of the pressure channel (41) close to the low-pressure stage compression assembly (2) forms a cylinder (44), the joint structure is movably arranged in the cylinder (44), and the cross-sectional area of ​​the cylinder (44) is larger than the cross-sectional area of ​​the pressure channel (41).

7. The compressor according to claim 4, wherein: The low-pressure stage compression assembly (2) comprises a low-pressure stage active rotor (21), the high-pressure stage compression assembly (3) comprises a high-pressure stage active rotor (31), one of the coupling structures is arranged on the low-pressure stage active rotor (21), and the other of the coupling structures is arranged on the high-pressure stage active rotor (31).

8. The compressor according to claim 7, wherein: The central axis of the low-pressure stage active rotor (21) and the central axis of the high-pressure stage active rotor (31) are collinear, and there is a distance between the two active rotors, and the two engagement structures are both located within the distance.

9. The compressor according to claim 8, wherein: The two engaging structures include a high-pressure stage engaging structure (52) and a low-pressure stage engaging structure. The gap is formed between the first end of the low-pressure stage active rotor (21) and the second end of the high-pressure stage active rotor (31). The high-pressure stage engaging structure (52) can protrude from the high-pressure stage active rotor (31) through the second end of the high-pressure stage active rotor (31). The low-pressure stage engaging structure is arranged on the first end of the low-pressure stage active rotor (21).

10. The compressor according to claim 9, wherein: A connecting groove (51) is provided on the first end of the low-pressure stage active rotor (21), and the connecting groove (51) constitutes the low-pressure stage joint structure; a connecting protrusion (53) is provided on the high-pressure stage joint structure (52), and the connecting protrusion (53) can be snap-fitted with the connecting groove (51); or, a connecting protrusion (53) is provided on the first end of the low-pressure stage active rotor (21), and the connecting protrusion (53) constitutes the low-pressure stage joint structure; a connecting groove (51) is provided on the high-pressure stage joint structure (52), and the connecting groove (51) can be snap-fitted with the connecting protrusion (53).

11. The compressor of claim 1, wherein: The shell (1) is provided with a low-pressure exhaust port, a high-pressure exhaust port and an air intake port, the air intake port and the low-pressure exhaust port are both connected to the low-pressure stage compression component (2), and the high-pressure exhaust port is connected to the high-pressure stage compression component (3).

12. An air conditioning unit, comprising the compressor according to any one of claims 1 to 11.

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