Compressors, air conditioning systems and heat pump systems

Abstract

This invention provides a compressor, an air conditioning system, and a heat pump system. The compressor includes a housing; a crankshaft; a roller assembly; and an adjustment structure. The adjustment structure is disposed on the housing and can adjust the volume of the compression chamber and the size of the roller assembly in the direction of the crankshaft's rotation axis. The compressor, air conditioning system, and heat pump system provided by this invention utilize the adjustment mechanism to adjust the volume of the compression chamber, thereby achieving the purpose of adjusting the compressor's discharge capacity and compression ratio. This overcomes the problem in the prior art that requires a frequency converter to adjust the compressor's speed, reduces the compressor's energy consumption, improves the adjustment accuracy of the compressor's discharge pressure, and the adjustment mechanism can also simultaneously adjust the roller assembly, enabling the roller assembly to adapt to the volume of the compression chamber, ensuring the compressor's reliable operation, and improving the energy efficiency and reliability of the air conditioning system and heat pump system.

Description

Technical Field

[0001] This invention relates to the field of compression equipment technology, and in particular to a compressor, an air conditioning system, and a heat pump system. Background Technology

[0002] The air conditioning / heat pump compressor plays a driving role in the refrigerant circuit of the air conditioning / heat pump, and is generally installed in the outdoor unit. Currently, some air conditioning / heat pump compressors on the market use a rolling rotor type, which is widely used in the refrigeration and heating industries due to its simple structure, low cost, and high reliability, such as in air conditioners, water heaters, and refrigeration equipment.

[0003] With the increasing national production standards and user demands, variable frequency and variable capacity technologies are being widely applied to air conditioners / heat pumps to ensure energy efficiency under both low and high load conditions. Currently, variable capacity technology is typically used in twin-cylinder compressors, adjusting the number of cylinders in operation to regulate exhaust pressure. For smaller household air conditioner / heat pump compressors, variable frequency rotors are more common, using an inverter to adjust the rotor speed and thus regulate exhaust pressure.

[0004] However, the technology of using frequency converters for regulation has poor precision in regulating the compressor's discharge pressure, which can also increase the compressor's energy consumption and seriously affect the energy efficiency and reliability of the air conditioning / heat pump system. Summary of the Invention

[0005] In order to solve the technical problems of increased energy consumption and poor exhaust pressure regulation accuracy of compressors used in household air conditioners / heat pumps in the prior art, a compressor, air conditioning system and heat pump system are provided that use an adjustment mechanism to adjust the volume of the compression chamber and the roller assembly without using a frequency converter to reduce energy consumption and improve exhaust pressure regulation accuracy.

[0006] A compressor, comprising:

[0007] A housing having a compression cavity formed within it;

[0008] A crankshaft, which is rotatably disposed within the housing;

[0009] A roller assembly, rotatably disposed within the compression chamber, the roller assembly being connected to the crankshaft, and the dimensions of the roller assembly being adjustable in the direction of the rotation axis of the crankshaft;

[0010] An adjustment structure is provided on the housing, and the adjustment structure is capable of adjusting the volume of the compression chamber and the size of the roller assembly in the direction of the rotation axis of the crankshaft.

[0011] The roller assembly includes a first roller and a second roller. The first roller has a receiving cavity, and the second roller is telescopically disposed within the receiving cavity. The adjustment structure can drive the second roller to move.

[0012] The housing includes an upper flange, a first cylinder, a second cylinder, and a lower flange arranged sequentially along the rotation axis of the crankshaft. The first cylinder and the second cylinder are interconnected, and the upper flange, the first cylinder, the second cylinder, and the lower flange together form the compression chamber. The first roller is rotatably disposed in the first cylinder, and the outer wall of the first roller can fit against a portion of the inner wall of the first cylinder. The second roller is rotatably disposed in the second cylinder, and the outer wall of the second roller can fit against a portion of the inner wall of the second cylinder.

[0013] The adjustment structure is disposed on the lower flange, the second roller is connected to the adjustment structure, and the adjustment structure can extend into the second cylinder to drive the second roller to move.

[0014] The adjusting structure includes a piston, which is movably disposed inside the second cylinder, and the outer wall of the piston is sealed to the inner wall of the second cylinder. The upper flange, the first cylinder, the second cylinder, and the piston together form the compression chamber, and the second roller is connected to the piston.

[0015] The compression chamber is provided with an exhaust port. The piston, the lower flange, and the corresponding second cylinder portion together form a pressure chamber, which is connected to the exhaust port.

[0016] The roller assembly further includes a reset mechanism disposed between the first roller and the second roller, the reset mechanism enabling the first roller and the second roller to move relative to each other along the rotation axis of the crankshaft.

[0017] The reset mechanism includes a spring, one end of which abuts against the bottom wall of the receiving cavity, and the other end of which abuts against the second roller.

[0018] The compressible length L and elastic coefficient K of the spring satisfy the following formula with respect to the target discharge pressure F of the compressor:

[0019] F = (KL + F3 * S1 + F4 * S2) / S3;

[0020] Wherein, F3 is the pressure of the compression section in the compression chamber; S1 is the surface area of ​​the piston in the compression section of the compression chamber; S2 is the surface area of ​​the piston in the suction section of the compression chamber; F4 is the pressure of the suction section in the compression chamber; and S3 is the surface area of ​​the piston in the pressure chamber.

[0021] The lower flange is provided with a pressure inlet, and the exhaust port is connected to the pressure chamber through the pressure inlet. When the piston and the lower flange are in contact with each other, S3 is the flow area of ​​the pressure inlet.

[0022] The compressor further includes a first vane, which is movably disposed on the housing and abuts against the outer wall of the first roller and the outer wall of the second roller.

[0023] The compressor further includes a second vane, which is movably disposed on the piston and engages with the first vane.

[0024] An air conditioning system includes the compressor described above.

[0025] A heat pump system comprising the compressor described above.

[0026] The compressor, air conditioning system, and heat pump system provided by this invention utilize an adjustment mechanism to adjust the volume of the compression chamber, thereby achieving the purpose of adjusting the compressor's discharge volume and compression ratio. This overcomes the problem in the prior art that a frequency converter is needed to adjust the compressor's speed, reduces the compressor's energy consumption, improves the adjustment accuracy of the compressor's discharge pressure, and the adjustment mechanism can also simultaneously adjust the roller assembly, enabling the roller assembly to adapt to the volume of the compression chamber, ensuring the compressor's reliable operation, and improving the energy efficiency and reliability of the air conditioning system and heat pump system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the compressor provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the compression chamber and roller assembly provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the compression chamber and roller assembly provided in an embodiment of the present invention;

[0030] Figure 4 A cross-sectional view of a compressor provided in an embodiment of the present invention;

[0031] Figure 5 Another cross-sectional view of the compressor provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the piston in its lowest position according to an embodiment of the present invention;

[0033] Figure 7 This is another structural schematic diagram of the piston in its lowest position according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the piston in the middle position according to an embodiment of the present invention;

[0035] Figure 9 This is another structural schematic diagram of the piston being in the middle position according to an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the piston in its highest position according to an embodiment of the present invention;

[0037] Figure 11 This is another structural schematic diagram of the piston in its highest position according to an embodiment of the present invention;

[0038] In the picture:

[0039] 1. Housing; 11. Compression chamber; 2. Crankshaft; 31. First roller; 32. Second roller; 13. First cylinder; 14. Second cylinder; 4. Piston; 16. Pressure chamber; 5. Reset mechanism; 17. Pressure inlet; 6. First vane; 7. Second vane. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Currently, variable displacement technology is commonly used in twin-cylinder compressors, where the number of compressor cylinders in operation is adjusted to regulate exhaust pressure. However, small household air conditioner / heat pump compressors mostly use variable frequency rotors, where the rotor speed is adjusted by a frequency converter to regulate exhaust pressure. However, this method of using frequency converters results in poor accuracy in regulating the compressor's exhaust pressure and increases energy consumption, severely impacting the energy efficiency and reliability of the air conditioning / heat pump system.

[0046] Therefore, this application provides a method such as Figures 1 to 11The compressor shown includes: a housing 1, within which a compression chamber 11 is formed; a crankshaft 2, rotatably disposed within the housing 1; a roller assembly, rotatably disposed within the compression chamber 11, connected to the crankshaft 2, and whose dimensions are adjustable along the rotation axis of the crankshaft 2; and an adjustment structure disposed on the housing 1, capable of adjusting the volume of the compression chamber 11 and the dimensions of the roller assembly along the rotation axis of the crankshaft 2. By adjusting the volume of the compression chamber 11 using the adjustment mechanism, the compressor's discharge capacity and compression ratio can be adjusted, overcoming the problem of requiring a frequency converter to regulate the compressor's speed in existing technologies. This reduces the compressor's energy consumption, improves the accuracy of the compressor's discharge pressure regulation, and allows the adjustment mechanism to simultaneously adjust the roller assembly, enabling the roller assembly to adapt to the volume of the compression chamber 11, ensuring reliable compressor operation and improving the energy efficiency and reliability of air conditioning and heat pump systems.

[0047] During use, the regulating structure can be controlled according to the target exhaust pressure. By utilizing the encroachment of the regulating structure on the internal space of the housing 1, the volume of the compression chamber 11 can be adjusted, so that the exhaust pressure of the compressor can be matched with the target exhaust pressure, thereby achieving the purpose of changing the compressor capacity. Since the compressor relies on the rotation of the roller assembly in the receiving cavity to achieve compression during operation, when the regulating structure adjusts the volume of the compression chamber 11, the roller assembly will also be adjusted synchronously to avoid interference between the roller assembly and the regulating structure, thus ensuring the reliability of the compressor.

[0048] In one embodiment, the roller assembly includes a first roller 31 and a second roller 32. The first roller 31 is provided with a receiving cavity, and the second roller 32 is telescopically disposed in the receiving cavity. The adjustment structure can drive the second roller 32 to move. By utilizing the telescopic movement of the second roller 32, the size adjustment of the roller assembly in the direction of the rotation axis of the crankshaft 2 can be realized, so that the roller assembly can always match the compression chamber 11 in the direction of the rotation axis of the crankshaft 2, ensuring reliable compression of the fluid in the compressor by the roller assembly during rotation.

[0049] The housing 1 includes an upper flange, a first cylinder 13, a second cylinder 14, and a lower flange arranged sequentially along the rotation axis of the crankshaft 2. The first cylinder 13 and the second cylinder 14 are interconnected, and the upper flange, the first cylinder 13, the second cylinder 14, and the lower flange together form the compression chamber 11. The first roller 31 is rotatably disposed in the first cylinder 13, and the outer wall of the first roller 31 can fit against a portion of the inner wall of the first cylinder 13. The second roller 32 is rotatably disposed in the second cylinder 14, and the outer wall of the second roller 32 can fit against a portion of the inner wall of the second cylinder 14. Since the second roller 32 needs to extend into the receiving cavity on the first roller 31, and the diameter of the second roller 32 is smaller than the diameter of the first roller 31, a first cylinder 13 and a second cylinder 14 of different sizes are provided. The first cylinder 13 is configured to cooperate with the first roller 31, and the second cylinder 14 is configured to cooperate with the second roller 32. During the rotation of the roller assembly, the outer wall of the first roller 31 can roll in close contact with the inner wall of the first cylinder 13, forming a continuously changing compression and suction section within the first cylinder 13. As the first roller 31 rotates, the volume of the compression section gradually... The volume of the fluid is gradually reduced, thereby compressing part of the gas inside the compression chamber 11. At the same time, the outer wall of the second roller 32 can also roll against the inner wall of the second cylinder 14, forming a constantly changing compression section and suction section inside the second cylinder 14. As the second roller 32 rotates, the volume of the compression section gradually decreases, thereby compressing the fluid and compressing the remaining gas inside the compression chamber 11. Since the first roller 31 and the second roller 32 rotate synchronously, the fluid inside the compression chamber 11 can be reliably compressed, ensuring the reliable operation of the compressor.

[0050] The end face of the first roller 31 away from the second roller 32 is in contact with the surface of the upper flange, while the end face of the second roller 32 away from the first roller 31 can be in contact with the adjustment structure to ensure reliable compression of the fluid in the compression chamber 11, thereby ensuring the reliable operation of the compressor.

[0051] The adjusting structure is mounted on the lower flange. The second roller 32 is connected to the adjusting structure, and the adjusting structure can extend into the second cylinder 14 to drive the second roller 32 to move. By extending the adjusting structure into the second cylinder 14, the volume of the second cylinder 14 can be occupied by adjusting the position of the adjusting structure within the second cylinder 14, thereby adjusting the volume of the second cylinder 14 and the volume of the compression chamber 11. Since the second roller 32 is connected to the adjusting structure, the movement of the adjusting structure within the second cylinder 14 can synchronously drive the second roller 32 to move, thereby achieving the adjustment of the roller assembly, ensuring that the roller assembly adapts to the volume changes of the compression chamber 11, and ensuring the reliability of the compressor.

[0052] Specifically, the adjustment structure includes a piston 4, which is movably disposed within the second cylinder 14, and the outer wall of the piston 4 is sealed to the inner wall of the second cylinder 14. The upper flange, the first cylinder 13, the second cylinder 14, and the piston 4 together form the compression chamber 11. The second roller 32 is connected to the piston 4. By moving the piston 4 within the second cylinder 14, the portion of the second cylinder 14 that forms the compression chamber 11 can be adjusted, thereby achieving the purpose of adjusting the volume of the compression chamber 11.

[0053] To achieve adjustment of piston 4, an exhaust port is provided on the compression chamber 11. Piston 4, the lower flange, and the corresponding second cylinder 14 together form a pressure chamber 16. The pressure chamber 16 is connected to the exhaust port, and the exhaust of the compressor is introduced into the pressure chamber 16 through the exhaust port. At this time, one side of piston 4 is the exhaust pressure of the compressor, and the other side is the pressure in the compression chamber 11. The difference between the two pressures can drive piston 4 to move, thereby achieving automatic adjustment of the receiving chamber. This further overcomes the problems of increased energy consumption and low adjustment accuracy caused by the need to set up a frequency converter for adjustment in the prior art, and improves the energy efficiency and working accuracy of the compressor.

[0054] Furthermore, the roller assembly also includes a reset mechanism 5, which is disposed between the first roller 31 and the second roller 32. The reset mechanism 5 enables the first roller 31 and the second roller 32 to move relative to each other along the rotation axis of the crankshaft 2. The reset mechanism 5 counteracts the pressure in the pressure chamber 16 to a certain extent, and also provides power for the second roller 32 to move away from the upper flange. At this time, the second roller 32 only needs to abut against the surface of the piston 4. When the piston 4 is squeezed by the pressure in the pressure chamber 16 and moves towards the first roller 31, the second roller 32 moves with the piston 4. When the piston 4 is squeezed by the pressure in the compression chamber 11 and moves away from the first roller 31, the second roller 32 moves under the drive of the reset mechanism 5, ensuring the working reliability of the second roller 32 in the second cylinder 14. At the same time, the variable capacity adjustment capability of the compressor can be adjusted according to the reset capability of the reset mechanism 5, ensuring that the variable capacity adjustment of the compressor is reliable and controllable.

[0055] Specifically, the reset mechanism 5 includes a spring. One end of the spring abuts against the bottom wall of the receiving cavity, and the other end abuts against the second roller 32. As the second roller 32 moves toward the first roller 31, the spring is gradually compressed, and the pressure on the second roller 32 gradually increases until the combined force of the pressure of the spring on the second roller 32 and the pressure of the compression chamber 11 on the piston 4 is balanced with the pressure on the piston 4 in the pressure chamber 16. At this point, the piston 4 and the second roller 32 stop moving. As the volume of the compression chamber 11 decreases, the exhaust pressure also decreases. At this time, the pressure in the pressure chamber 16 gradually decreases, and the pressure balance is broken. The elastic force of the spring can drive the second roller 32 to move, thereby squeezing the piston 4 to move away from the first roller 31. The volume of the compression chamber 11 increases, and the pressure in the pressure chamber 16 gradually increases, eventually reaching pressure balance on both sides of the piston 4 again. At this time, the compressor's capacity change is completed. The compressor's exhaust pressure is adjusted according to the load, so that the volume of the compressor's compression chamber 11 can also be adjusted with the load, ensuring the compressor's operational reliability.

[0056] The compressible length L and elastic coefficient K of the spring satisfy the following formula with respect to the target discharge pressure F of the compressor:

[0057] F = (KL + F3 * S1 + F4 * S2) / S3;

[0058] Wherein, F3 is the pressure of the compression portion in the compression chamber 11; S1 is the surface area of ​​the piston 4 in the compression portion of the compression chamber 11; S2 is the surface area of ​​the piston 4 in the suction portion of the compression chamber 11; F4 is the pressure of the suction portion in the compression chamber 11; and S3 is the surface area of ​​the piston 4 in the pressure chamber 16. Since piston 4 forms the lower surface of compression chamber 11, and the roller assembly, during its rotation within compression chamber 11, divides it into a compression section and an intake section with continuously changing volumes, piston 4 will have parts of its surface in the compression section and parts in the intake section. Therefore, the pressure exerted by compression chamber 11 on piston 4 is calculated as F3*S1 + F4*S2, where F3*S1 is the pressure exerted by the compression section on piston 4 within compression chamber 11, and F4*S2 is the pressure exerted by the intake section on piston 4 within compression chamber 11. Then, the pressure KL transmitted from the spring to piston 4 via the second roller 32 is calculated to obtain the pressure value of piston 4 facing the surface of compression chamber 11. F represents the target exhaust pressure, which is also the pressure value for the compressor during variable volume stabilization. The exhaust pressure is then sent into the pressure chamber 16 to compress the piston 4. Therefore, the surface area of ​​the piston 4 facing the pressure chamber 16 is calculated with the exhaust pressure (i.e., F*S3). At this time, the exhaust pressure F can be selected according to the system requirements. During the design, with the dimensions of the first cylinder 13, the second cylinder 14, the roller assembly, and the piston 4 determined, the spring constant K and the compressible length L are determined by calculation. Alternatively, the values ​​of S1, S2, S3, and S4 can be changed by adjusting the dimensions of the first cylinder 13, the second cylinder 14, the roller assembly, and the piston 4 to make the designed compressor meet the requirements, so that the compressor can operate under the optimal energy efficiency and pressure conditions under different working conditions.

[0059] The lower flange is provided with a pressure inlet 17, and the exhaust port communicates with the pressure chamber 16 through the pressure inlet 17. When the piston 4 is in contact with the lower flange, S3 is the flow area of ​​the pressure inlet 17. When the piston 4 moves to the bottom, the area of ​​the pressure chamber 16 becomes zero, and the compressor's exhaust pressure can only act on the piston 4 through the area of ​​the exhaust port. Therefore, S3 is determined as the flow area of ​​the exhaust port at this time. However, if the piston 4 moves to the bottom, the area of ​​the pressure chamber 16 is not zero, and S3 is the surface area of ​​the end face of the piston 4 that forms the pressure chamber 16.

[0060] Specifically, when a compressor is applied to an air conditioning system or heat pump system, before the compressor starts running, the pressure at the compressor's inlet and outlet is equal. Piston 4, under the spring force KL of the lower spring in the roller assembly, is in contact with the lower flange, and the compressor starts running at its maximum displacement, enabling the air conditioning system or heat pump system to obtain maximum output power and capacity. During operation, due to changes in system parameters, the compressor's discharge pressure F continuously increases. When the discharge pressure F meets the following condition: F>(KL+F3*S1+F4*S2) / S3, piston 4 moves upward, the compressor's displacement decreases, the system power and capacity decrease, and the discharge pressure decreases. After piston 4 moves, it disengages from the lower flange. At this point, the surface of piston 4 forming the pressure chamber 16 directly contacts the compressor's exhaust gas, and the exhaust pressure acts on piston 4 to further push it. The piston 4 moves upward. When F = (KL + F3*S1 + F4*S2) / S3, the piston 4 stops moving. If the exhaust pressure F increases at this time, the resultant force on the piston 4 is upward, and the piston 4 moves upward. During the upward movement of the piston 4, the compression length L of the spring increases, the compressor displacement begins to decrease, and the compressor exhaust pressure F also begins to decrease until F = (KL + F3*S1 + F4*S2) / S3, reaching an equilibrium state and the piston 4 stops moving. If the exhaust pressure F decreases at this time, the resultant force on the piston 4 is downward, and the piston 4 moves downward. During the downward movement of the piston 4, the compression length L of the spring decreases, and at the same time, the exhaust pressure F caused by the increase in compressor displacement increases. Similarly, until F = (KL + F3*S1 + F4*S2) / S3, reaching an equilibrium state and the piston 4 stops moving.

[0061] The compressor further includes a first vane 6, which is movably disposed on the housing 1, and the first vane 6 abuts against the outer wall of the first roller 31 and the outer wall of the second roller 32. The cooperation between the first vane 6 and the first roller 31 and the second roller 32 ensures the separation of the compression and suction portions within the compression chamber 11, guaranteeing the normal operation of the compressor. Since the second roller 32 needs to extend into the receiving cavity on the first roller 31, and the diameter of the second roller 32 is smaller than that of the first roller 31, the first vane 6 is divided into two parts: one part matches the first roller 31, and the other part matches the second roller 32, thereby ensuring reliable separation of the compression chamber 11. Preferably, the end face of the first vane 6 is a stepped surface, and the dimensional difference between the two surfaces of the stepped surface is equal to the radii difference between the first roller 31 and the second roller 32. The first slide plate 6 is installed in the slide plate groove on the housing 1. The upper surface of the first slide plate 6 is attached to the upper flange, so that the first slide plate 6 can reciprocate in a square tunnel formed by the slide plate groove and the upper flange. A spring is provided on the first slide plate 6 to provide a restoring force for the movement of the first slide plate 6. The stepped surface of the first slide plate 6 is designed as an arc surface. The two arc surfaces are connected by a vertical plane. The two arc surfaces are respectively attached to the cylindrical side surface of the first roller 31 and the cylindrical side surface of the second roller 32 to form a seal. The vertical plane is attached to the lower end surface of the first roller 31 to form a seal.

[0062] The compressor also includes a second vane 7, which is movably mounted on the piston 4 and abuts against the first vane 6. The second vane 7 and piston 4 further separate the compression chamber 11, ensuring the compressor's operational reliability. The upper surface of the second vane 7 is in contact with the lower end face of the second roller 32. The right end face of the second vane 7 is designed with a concave arc that fits against the arc surface of the first vane 6 to form a seal. The second vane 7 forms a square tunnel in the vane groove of the piston 4 and the lower end face of the second roller 32, constantly reciprocating against the first vane 6. A spring is fitted on the left side of the second vane 7 to provide a restoring force, ensuring the reliable contact between the second vane 7 and the first vane 6.

[0063] An air conditioning system includes the compressor described above.

[0064] A heat pump system comprising the compressor described above.

[0065] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A compressor, characterized in that: include: The housing (1) has a compression cavity (11) formed inside it. A crankshaft (2) is rotatably disposed within the housing (1); A roller assembly is rotatably disposed in the compression chamber (11), the roller assembly is connected to the crankshaft (2), and the size of the roller assembly is adjustable in the direction of the rotation axis of the crankshaft (2); An adjustment structure is provided on the housing (1), and the adjustment structure is capable of adjusting the volume of the compression chamber (11) and the size of the roller assembly in the direction of the rotation axis of the crankshaft (2); The roller assembly includes a first roller (31) and a second roller (32). The first roller (31) is provided with a receiving cavity, and the second roller (32) is retractably disposed in the receiving cavity. The adjustment structure can drive the second roller (32) to move.

2. The compressor according to claim 1, characterized in that: The housing (1) includes an upper flange, a first cylinder (13), a second cylinder (14) and a lower flange arranged sequentially along the rotation axis of the crankshaft (2). The first cylinder (13) and the second cylinder (14) are interconnected, and the upper flange, the first cylinder (13), the second cylinder (14) and the lower flange together form the compression chamber (11). The first roller (31) is rotatably disposed in the first cylinder (13), and the outer wall of the first roller (31) can fit against a part of the inner wall of the first cylinder (13). The second roller (32) is rotatably disposed in the second cylinder (14), and the outer wall of the second roller (32) can fit against a part of the inner wall of the second cylinder (14).

3. The compressor according to claim 2, characterized in that: The adjustment structure is disposed on the lower flange, the second roller (32) is connected to the adjustment structure, and the adjustment structure can extend into the second cylinder (14) to drive the second roller (32) to move.

4. The compressor according to claim 3, characterized in that: The adjustment structure includes a piston (4), which is movably disposed in the second cylinder (14), and the outer wall of the piston (4) is sealed to the inner wall of the second cylinder (14). The upper flange, the first cylinder (13), the second cylinder (14) and the piston (4) together form the compression chamber (11), and the second roller (32) is connected to the piston (4).

5. The compressor according to claim 4, characterized in that: The compression chamber (11) is provided with an exhaust port. The piston (4) and the lower flange together with the corresponding second cylinder (14) form a pressure chamber (16). The pressure chamber (16) is connected to the exhaust port.

6. The compressor according to claim 5, characterized in that: The roller assembly further includes a reset mechanism (5), which is disposed between the first roller (31) and the second roller (32). The reset mechanism (5) enables the first roller (31) and the second roller (32) to move relative to each other along the rotation axis of the crankshaft (2).

7. The compressor according to claim 6, characterized in that: The reset mechanism (5) includes a spring, one end of which abuts against the bottom wall of the receiving cavity, and the other end of which abuts against the second roller (32).

8. The compressor according to claim 7, characterized in that: The compressible length L and elastic coefficient K of the spring satisfy the following formula with respect to the target discharge pressure F of the compressor: F = (KL + F3 * S1 + F4 * S2) / S3; Wherein, F3 is the pressure of the compression portion in the compression chamber (11); S1 is the surface area of ​​the piston (4) in the compression portion of the compression chamber (11); S2 is the surface area of ​​the piston (4) in the suction portion of the compression chamber (11); F4 is the pressure of the suction portion in the compression chamber (11); and S3 is the surface area of ​​the piston (4) in the pressure chamber (16).

9. The compressor according to claim 8, characterized in that: The lower flange is provided with a pressure inlet (17), and the exhaust hole is connected to the pressure chamber (16) through the pressure inlet (17). When the piston (4) and the lower flange are in contact with each other, S3 is the flow area of ​​the pressure inlet (17).

10. The compressor according to claim 4, characterized in that: The compressor further includes a first vane (6), which is movably disposed on the housing (1), and the first vane (6) abuts against the outer wall of the first roller (31) and the outer wall of the second roller (32).

11. The compressor according to claim 10, characterized in that: The compressor also includes a second vane (7), which is movably disposed on the piston (4) and abuts against the first vane (6).

12. An air conditioning system, characterized in that: The compressor includes any one of claims 1 to 11.

13. A heat pump system, characterized in that: The compressor includes any one of claims 1 to 11.

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